Patent/Utility Model Document Display | J-PlatPat [JPP]
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`Document Display
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`JP,2002-220078,A
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`Display format of document display page :
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`Primary document | SA)
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`* NOTICE *
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`JPO and INPIT are not responsible for any damages caused by the use of this
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`translation.
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`1. This document has been translated by computer. So the translation may not reflect
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`the original precisely.
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`2. **** Shows a word which cannot be translated.
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`3. In the drawings, any words are not translated.
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`(19) [Publication country] JP
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`(12) [Kind of official gazette] A
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`(11) [Publication number] 2002220078
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`(43) [Date of publication of application] 20020806
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`(54) [Title of the invention] VEHICLE WITH ASSISTING POWER
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`(51) [International Patent Classification 7th Edition]
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`B62M 23/02
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`B62M 11/16
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`HO2K 3/50
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`HO2K 11/00
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`HO0O2K 29/08
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`[FT]
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`Patent/Utility Model Document Display | J-PlatPat [JPP]
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`Page 2 of 32
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`B62M 23/02
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`L
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`11/16
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`HO2K 3/50
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`29/08
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`11/00
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`A
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`Xx
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`A
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`(21) [Application number] 2001015711
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`(22) [Filing date] 20010124
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`(71) [Applicant]
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`[Name] SANYO ELECTRIC CO LTD
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`(72) [Inventor]
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`[Full name] SAGARA HIROAKI
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`[Full name] TOMOSHIGE KAZUHIRO
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`[Full name] YAMAGUCHI SEIJI
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`[Full name] MATSUMOTO KAZUHISA
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`[Theme code (reference) ]
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`5H0O19
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`5H604
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`5H611
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`[F-term (reference) ]
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`5H0O19 AA10 BBO1 BBOS5 BB15 BB20 BB22 CCO03 CCO9 DDO1 EEO1 EE14 FFOO FFO
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`1 5
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`H604 AAO8 BBO1 BB14 BB17 CCO1 CCO5 CC16 QBO03
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`5H611 AAO1 BBO8 PPO5 QQ03 RRO2 TTO1 UA04
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`(57) [Overview]
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`PROBLEM TO BE SOLVED: To easily attach a rotor position detecting means to en
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`hance assemblage, and to easily position the position detecting means to arrange
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`in an accurate position.
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`SOLUTION: This vehicle is provided with a manual driving part for driving wheels
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`by man power, and a motor-driven driving part 30 for driving the wheels by a mo
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`tor 40 capable of detecting magnetic pole positions of a rotor 42 to control a rotat
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`ional magnetic field of a stator 41, a substrate case 32 for arranging a control sub
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`strate 33 is attached to an inside of a lid part 31b of a casing 31 for covering the
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`motor 40, and the position detecting means (Hall element 49) for detecting the m
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`agnetic pole positions of the rotor 42 is provided in a face, of the case 32, oppose
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`d to the rotor 42.
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`{| (
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`ay
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`[Patent Claims]
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`Page 4 of 32
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`[Claim 1] The vehicle is provided with a human power driving part for driving a w
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`heel by human power and an electric driving part for driving the wheel by a moto
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`r which detects a magnetic pole position of the rotor and controls a rotating magn
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`etic field of the stator.
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`The vehicle according to claim 1, wherein a substrate case for arranging a control
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`substrate is mounted on an inside of a cover of a casing covering the motor, and
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`a position detecting means for detecting a magnetic pole position of the rotor is p
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`rovided on a surface of the substrate case facing the rotor.
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`[Claim 2] The vehicle with auxiliary power according to claim 1, wherein said posi
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`tion detecting means comprises a Hall element.
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`[Claim 3] The vehicle with auxiliary power according to claim 1 or 2, wherein the
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`substrate case is positioned and mounted inside the lid portion.
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`[Claim 4] The vehicle with auxiliary power according to claim 3, wherein the posit
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`ion detection means is positioned and mounted on the substrate case.
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`[Claim 5] The vehicle is provided with a human power driving part for driving a w
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`heel by human power and an electric driving part for driving the wheel by a moto
`r.
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`A vehicle according to claim 1, wherein a control board is disposed inside the cov
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`er of the casing covering the motor, and a connecting portion connecting the win
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`ding of the motor and the wiring of the control board is provided after the cover i
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`s attached to the casing.
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`[Claim 6] The vehicle with auxiliary power according to claim 5, wherein a termin
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`al hole for exposing a winding terminal of the motor to an outside of the cover po
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`rtion and a lead-out hole for guiding a wiring terminal from the control board to t
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`he outside of the lid portion are formed in the cover portion as the connecting por
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`tion.
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`[Detailed description of the invention]
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`[0001]
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`[Technical field of invention] The present invention relates to an auxiliary power a
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`ssisted vehicle such as an electric assisted bicycle, and more particularly, to a mo
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`tor for the vehicle.
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`[0002]
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`[Prior art] In an auxiliary powered vehicle of this type, in an electric assisted bicy
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`cle disclosed in Japanese Patent Application Laid-open No. 105155 (2000), a fixed
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`casing fixed to an axle is disposed in a rotating casing constituting a hub of a rear
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`wheel, and a DC brushless motor is mountedin the fixed casing of the rotating ca
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`sing. GO1L 3/14. The position detection sensor for detecting the magnetic pole p
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`osition of the rotor is mounted on an inner wall of the fixed casing, and the contro
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`| board is disposed on an outer side of the fixed casing. In addition, in the above
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`publication, an embodiment is disclosed in which a control board is attached to a |
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`id portion of a fixed casing.
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`[0003]
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`[Problem to be solved by the invention] However, in the above-mentioned publica
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`tion, a motor is assembled in a fixed casing.
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`Since the position detection sensor must be mounted on the inner wall of the fixe
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`d casing facing the rotor, the assembling property is poor and the positioning is di
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`fficult and the mounting error tends to occur, so that the accurate position detecti
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`on cannot be performed.
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`[0004]In addition, when the control board is attached to the lid of the fixed casin
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`g in which the motor is incorporated, it is generally necessary to connect the wind
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`ing of the motor and the control board by lead wires before the lid is attached to t
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`he fixed casing. When a lid portion is attached to a fixed casing, a lead wire is loo
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`sened, and there is a possibility that a rotating rotor and a lead wire interfere wit
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`h each other.
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`[0005 Accordingly, it is an object of the present invention to provide a vehicle wit
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`h an auxiliary power capable of easily mounting the position detecting means of a
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`rotor, improving assemblability, facilitating positioning of the position detecting m
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`eans, and arranging the vehicle at an accurate position.
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`[0006]Further, it is another object of the present invention to provide an auxiliary
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`power assisted vehicle in which a wiring connecting a winding of a motor and a co
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`ntrol board does not interfere with a rotor and can be easily wired.
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`[0007]
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`[Means for solving the problem] To achieve the above object, the present inventi
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`on provides a human power driving unit for driving a wheel by a human power an
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`d an electric driving unit for driving the wheel by a motor which detects a magnet
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`ic pole position of the rotor and controls a rotating magnetic field of the stator. A
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`substrate case for arranging a control substrate is mounted on the inside of a lid
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`part of a casing covering the motor, and a position detecting means for detecting
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`a magnetic pole position of the rotor is provided on a surface of the substrate cas
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`e facing the rotor.
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`[0008 ]Further, the position detecting means is constituted by a Hall element.
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`[0009]Further, the substrate case may be positioned and mounted on the inside
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`of the lid portion.
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`[0010]Further, the position detecting means may be positioned and mounted on t
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`he substrate case.
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`[0011]On the other hand, there is provided a human power driving unit for drivin
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`g the wheels by human power and an electric driving unit for driving the wheels b
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`y the motor, and a control board is arranged inside the cover of the casing coveri
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`ng the motor. FIG. 1 is a perspective view showing a configuration of a motor acc
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`ording to an embodiment of the present invention ;.
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`[0012]In addition, a terminal hole for exposing the winding terminal of the motor
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`to the outside of the cover portion and a lead-out hole for guiding the wiring term
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`inal from the control board to the outside of the lid portion are formed on the cov
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`er portion.
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`[0013]
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`[Embodiment of invention] In the following, an embodiment of the present invent
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`ion will be described.
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`It describes taking the case of a * assistant bicycle.
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`[0014]First, a configuration of an entire electric assisted bicycle will be described
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`with reference to FIG. 14.
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`[0015]In this electric assisted bicycle, a head pipe 1 provided at a front part and
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`a seat tube 3 to which a saddle 2 is attached are connected by a main frame 4, a
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`nd a pedal 5 rotating by human power is attached at a part where the main fram
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`e 4 and the seat tube 3 are connected.
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`[0016]On the head pipe 1, a handle 6 and a front wheel 7 which determines a tra
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`veling direction by the handle operation are mounted so as to be connected throu
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`gh a head pipe 1. In the drawing, only the rim 8 of the front wheel 7 and the tire
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`9 are shown, and the spokes are omitted.
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`[0017]A battery 11 serving as a power source of a motor or the like to be describ
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`ed later is mounted under the front car 10 mounted on the head pipe 1, and a nic
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`kel-cadmium battery of 24 volts is used as the battery 11. The battery 11 is hous
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`ed in a battery case so as to be detachable, and can be removed and charged ind
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`oors during charging.
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`[0018]Further, a front sprocket 12 which rotates together with a pedal 5 is attach
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`ed to the pedal 5, a chain 13 is attached to the front sprocket 12, and a rotation
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`of the front sprocket 12 is transmitted to a rear sprocket which is provided on an
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`unillustrated axle of the rear wheel 14 via a chain 13.
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`[0019]A rear wheel 14 serving as a driving wheel includes a tire 15, arim 16, as
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`poke (not shown) and a driving unit 17 for driving the rear wheel 14. As will be d
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`escribed later, the drive unit 17 includes a torque detection unit (torque sensor) t
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`hat detects a human torque transmitted via a chain 13, an electric drive unit that
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`includes a motor and a speed reduction mechanism, a microcomputer that receiv
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`es a detection value of the torque detection unit and outputs a drive signal to the
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`motor, and the like, and a control circuit. A brake device 19 for braking a rear wh
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`eel 14 by operating a brake lever 18 mounted on the handle 6 is mounted.
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`[0020]As described above, the rear wheel 14 is driven by the 2 driving units, I.
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`e., a human power driving unit including a pedal 5, a front sprocket 12, a chain 1
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`3, a rear sprocket and a transmission and the like, and an electric driving unit incl
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`uding a motor and a speed reduction mechanism, and can be used in combinatio
`n,
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`[0021 ]Next, the driving unit 17 of the electric assisted bicycle will be described in
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`detail with reference to FIGS. 1 to 6.
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`[0022]An internal type transmission 21 similar to an ordinary bicycle is provided
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`on a part of a longitudinal direction of an axle 20 of a rear wheel 14, and the tran
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`smission 21 is connected to a rear sprocket 22 via a one way clutch (not shown),
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`and said pedal is connected to the rear sprocket.
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`Power is transmitted only by one direction rotation of 5, and when the pedal 5 is r
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`eversely rotated, power transmission to the transmission 21 is interrupted.
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`[0023 ]The internal type transmission 21 is covered with a rotary casing 23 consti
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`tuting a hub of a rear wheel 14 about an axle 20, and the rotary casing 23 consist
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`s of 2 parts. In a rotating casing 23 a having 2 annular ribs 24 a and 24 b for mo
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`unting spokes on an outer periphery, the other is a rotary casing 23 b which is fix
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`ed to the annular ribs 23 b at a plurality of positions such as a * which closes an
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`opening of the rotating casing 24 a.
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`[0024]A large gear 25 constituting a final stage of the speed reduction mechanis
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`m is fixed to an inside of the other rotating casing 23 b, and a brake holder 26 is
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`fixed to an outside of the rotating casing 2 b so as to be concentric with an axle 2
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`0. In the brake holder 26, a rotating piece 27 having a disk-like standing wall for
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`med toward the outside of the rotating casing 23 b is attached by a screw, weldin
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`g, or the like. On an inner periphery of the rotating piece 27, a brake device 19 is
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`provided for braking the rotation of the rotating casing 23 in an outward directio
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`n, I. e., in sliding contact with an inner periphery of the rotating piece 27 by oper
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`ating the brake lever 18. The rotating piece 27 and the brake device 19 are cover
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`ed with a brake cover 28.
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`[0025]A cord 29 such as a power supply line or other signal line from the battery
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`11 penetrates the brake cover 28, and is inserted into a portion of the fixed casin
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`g 31 constituting the electric drive unit 30 in which a part of the lid unit 31 bis cu
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`t out, and is connected to a control board 33 in the board case 32 mounted inside
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`the lid unit 31 b of the fixed casing 31.
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`[0026]Screw stop fixing of the body part 31a which covers the DC brushless mot
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`or mentioned below, and the covering device 31b to which the large pulley 34 et
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`c. which constitute the board case 32 which incorporates the aforementioned cont
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`rol board 33, and a deceleration mechanism are attached is carried out, and the fi
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`xed casing 31 changes. The main body 31 a is attached to the outer periphery of
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`the transmission 21 via a bearing 35, and the lid 31 b is fixed to a portion of the
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`shaft 20 where the transmission 21 of the axle 31 is not provided. Since the contr
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`ol board 33 is covered with the board case 32 and is attached to the lid portion 3
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`1 b formed of an aluminum alloy or the like having good thermal conductivity, he
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`at generated from the control board 33 is radiated through the lid portion 31 b.
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`[0027]A stator 41 constituting a DC brushless motor 40 is mounted on an inner s
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`urface of a main body portion 31 a of a fixed casing 31, and the stator 41 is const
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`ituted by winding a winding around an iron core forming 18 slots. Electric power f
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`or forming a 3 phase rotating magnetic field is supplied to the stator 41 via a con
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`trol board 33 in the board case 32 mounted inside the lid 31 b of the fixed casing
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`31.
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`[0028]On the inner peripheral side of the stator 41, a transmission 21 is provided
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`through 2 bearings 43,43 and. 42
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`It is provided rotatably around the circumference. This rotor 42 consists of an out
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`er ring 45 formed of a silicon steel plate laminated with an inner ring 44 formed o
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`f a lightweight aluminum alloy, a plurality of magnets 46 forming a magnetic pole
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`are embedded in an outer peripheral part of the outer ring 45, and a toothed sma
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`Il pulley 47 is attached to the inner ring 44 so as to project toward the lid part 31
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`b.
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`[0029]A belt B is provided between a small pulley 47 provided on the rotor 42 an
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`d a large pulley 34 and a tension pulley 38 (shown in FIG. 5) mounted on the insi
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`de of the lid portion 31 b of the fixed casing 31 via a one way clutch 36. The pulle
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`ys 47,34,38 and the belt B are toothed so that no slippage occurs. Further, an ou
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`tput shaft of the large pulley 34 protrudes outside the lid portion 31 bto formas
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`mall gear 37, and the small gear 37 is configured to mesh with a large gear 25 m
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`ounted on the inside of the rotary casing 23 b. Accordingly, the rotation of the rot
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`or 42 is reduced by the small pulley 47, the large pulley 34, the one way clutch 3
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`6, the small gear 37, and the large gear 25 and transmitted to the rotating casing
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`23 b. A bearing 39 is provided between a large gear 25 mounted on the inside of
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`the rotary casing 23 b and an outer periphery of the cylindrical portion 31 c which
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`projects outward from the lid portion 31 b of the stationary casing 31 and is fixed
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`to the axle 20.
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`[0030]As described above, because the speed reduction mechanism of the output
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`stage of the motor 40, which is fast in rotation and easily generates large gear no
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`ise, is composed of the pulley 47,34,38 and the belt B, noise generated by the re
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`duction mechanism can be reduced.
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`[0031]As shown in FIG. 2 and the like, the large pulley 34 is attached to the insid
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`e of the lid portion 31 b by a holding member 31 d. The holding member 31 d is f
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`ormed to extend from the large pulley 34 to the mounting position (mounting hol
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`e 31) of the tension pulley 38, and a screw hole 38 b for rotatably mounting the t
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`ension pulley 38 on the screw 38 a (shown in FIG. 5) is formed at the mounting p
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`osition of the tension pulley 38. The holding member 31 d to which the large pull
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`ey 34 is attached is fixed to the rear side of the lid portion 31 b at a position wher
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`e the belt B is not brought into contact with each pulley 34,38, as shown in FIG.
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`2, in a state where the belt B is applied to the large pulley 34.
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`[0032]The tension pulley 38 is mounted on the body portion 31 a of the fixed casi
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`ng 31 by screwing the lid portion 31 b, and is inserted into the lid portion 31 b fro
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`m the mounting hole 31 formed larger than the diameter of the tension pulley 38,
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`and is attached to the screw hole 38 b of the holding member 31 d by a screw 38
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`a so as to be rotatable.
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`[0033 ]Also, a Hall element 49 for detecting a magnetic pole position of a rotor 42
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`required for driving and controlling a DC brushless motor 40 is mounted at a posit
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`ion corresponding to a magnet 46 of a rotor 42 on a rear surface side of a board c
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`ase 32 in which the control board 33 is housed, and this Hall element is mounted.
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`A detection signal of the child 49 is input to a microcomputer mounted on the con
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`trol board 33 to generate a motor control signal. In order to control the 3 phase r
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`otating magnetic field, 3 Hall elements 49 are arranged on the substrate 49 a at
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`predetermined intervals as shown in FIG. 2, and the substrate 49 a is positioned
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`and mounted at a predetermined position on the back side of the substrate case
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`32. Since the magnetic pole of the magnet 46 of the rotor 42 can be directly dete
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`cted by using the Hall element 49 as the position detecting means of the rotor 4
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`2, the magnetic pole position of the rotor 42 can be detected with a simple consti
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`tution because the part for discriminating the magnetic pole is not required and t
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`he number of parts is reduced.
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`[0034]Further, as shown in FIG. 3 and FIG. 4, the 3 winding terminals 31 a of the
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`stator 41 for generating a 3 phase rotating magnetic field are arranged so as to p
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`roject from the stator 41 toward the lid portion 41 b, and correspondingly, the lid
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`portion 31 b is provided with 3 terminal holes 31 p for exposing the winding termi
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`nal 41 a to the outside of the lid portion 31 b. Furthermore, a lead-out hole 31 q i
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`s formed in the lid portion 31 b for guiding the 3 wiring terminals 33 a from the c
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`ontrol board 33, which supplies electric power for generating the 3 phase rotating
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`magnetic field to the stator 41, to the outside of the lid portion 31 b. Each of the
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`wiring terminals 33 a is connected to a winding terminal 41 a exposed from each
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`of the terminal holes 31 p.
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`[0035]On the other hand, on the outer periphery of the transmission 21 on the si
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`de of the rear sprocket 22 where the human power is transmitted, a sensor plate
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`51 for a torque sensor which is inside the rotary casing 23 a and detects a human
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`torque is fixed. In addition, a packing 52 which slides in sliding contact with the s
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`ensor plate 51 is attached to an opening periphery of the opening of the rotary ca
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`sing 23 a, and measures such as waterproof and dustproof are taken.
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`[0036 ]Inside the sensor plate 51, a sensor case 54 is provided which is mounted
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`on the outer periphery of the transmission 21 via a bearing 53 and is fixed to the
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`rotary casing 23 a by a screw. The sensor plate 51 and the sensor case 54 are co
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`nnected to each other via a coil spring 55 interposed between a holding pin 51 a f
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`ixed to the sensor plate 51 and a housing portion 54 a provided in the sensor cas
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`e 54. That is, when the human power driving force is transmitted from the trans
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`mission 21 to the sensor plate 51, the coil spring 55 is contracted by a contractio
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`n amount corresponding to the magnitude of the human power torque, and the ro
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`tation casing 23 a is rotated via the sensor case 54.
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`[0037]An arc-shaped aluminum ring 57 is arranged on the inner side of the senso
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`r case 54 so as to be freely slidable on the outer periphery of the ring holder 56,
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`and the ring 57 is fitted and attached to the pin 58 at several positions on the out
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`er periphery of the ring 57, and a coin spring 59 having an energizing force in a d
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`irection expanding to the pin 58 is inserted. In addition, the ring 57 is adapted to
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`be brought into contact with an inclined surface (not shown) formed on the ring h
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`older 56, and when human power is applied, the sensor plate 51 is provided.
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`When the ring 57 is displaced in the direction of rotation, the ring 57 moves along
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`the inclined surface of the ring holder 56 while rotating the ring 57. Then, a coil 6
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`0 which is disposed on the outer periphery of the ring 57 and is connected to the
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`control board 33 on which the control circuit is mounted is used to introduce the
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`displacement of the ring 57 in the direction of the axle 20 as a change in inductan
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`ce. That is, this change in inductance is taken into the control board 33 as an elec
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`tric signal indicating the magnitude of the human torque, and the motor 40 is con
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`trolled based on this signal value.
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`[0038]As described above, since the ring 57 whose displacement amount varies a
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`ccording to the contraction of the coil spring 55, I. e., the magnitude of the huma
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`n torque, is used, the inductance of the coil 60 can be changed according to the
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`magnitude of the human torque, and the magnitude of the human torque can be
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`output as an electric signal.
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`[0039 ]Next, a configuration of the rotor 42 of the motor 40 will be described with
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`reference to FIGS. 7 to 13. Note that the same reference numerals as in FIGS. 1 t
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`o 6 denote the same parts.
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`[0040]As described above, the rotor 42 of the motor 40 includes an inner ring 44
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`and an outer ring 45 formed of a separate member, and the inner ring 44 is mad
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`e of an aluminum alloy that is a lightweight member, and the outer ring 45 is for
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`med of a stacked silicon steel plate.
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`[0041 ]As shown in FIG. 11 and the like, protrusions 44 a are formed on the inner
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`ring 44 at regular intervals at a plurality of locations on the outer circumference.
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`In addition, the inner ring 44 is formed into a thin wall shape except a part where
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`the projecting part 44 a is formed between an outer peripheral part and an inner
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`peripheral part of the inner ring 2. Holes 44 b to 44 are formed in the thin portion
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`s, and holes (in the present embodiment, the large and small circular holes 44 ct
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`o 44) having different shapes are formed at one portion of the thin portion so as t
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`o have the same volume as the other long holes 44 b.
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`[0042 ]With this configuration, in addition to weight reduction due to the fact that
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`the inner ring 44 is made of an aluminum alloy which is a lightweight member,it
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`is possible to further reduce the weight without impairing the strength.
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`[0043]Further, a flange portion 44 f is formed on one outer peripheral portion of t
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`he inner ring 44, and a notch portion 44 g is formed in a portion where the conve
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`x portion 44 a is formed.
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`[0044]As shown in FIG. 12 and the like, in the outer ring 45, a plurality of elonga
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`ted holes 45 b are formed in a plurality of magnetic pole portions 45 a protruding
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`to an outer periphery, and an iron plate 46 for a magnet is press-fitted into each
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`of the holes 45 b.
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`[0045]Further, a concave portion 45 c into which a convex portion 44 a of the inn
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`er ring 44 is press-fitted is formed on an inner peripheral side of the outer ring 4
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`5, and the inner ring 44 and the outer ring 45 are press-fitted into a portion wher
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`ea flange portion 44 f of the inner ring 44 is formed, as shown in FIG. 10 and the
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`like, by fitting the convex portion 45 a and the concave portion c respectively. 44.
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`Therefore, the rotor 42 can be easily assembled.
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`[0046]In addition, it is made of aluminum alloy during the press-fitting.
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`Aluminum chips cut out from the convex portion 44 a of the inner ring 44 are disc
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`harged from the cutout portion 44 g. As described above, even if the flange porti
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`on 44 f is formed, since the chip which emerges from the convex portion 44 a at t
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`he time of press-fitting can be discharged from the notch portion 44 g, assembly i
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`s further simplified.
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`[0047 ]The magnetization of the iron plate 44 of the rotor 42 is performedafter al
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`| the press-fitting has been performed, and thereafter, the different holes 46 c in
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`the shape of the inner ring 44 are positioned and fixed to the magnetizing jig. He
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`re, since holes 44 c to 44 having different shapes are formed by effectively utilizi
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`ng the holes 44 b to 44 for lightening, positioning at the time of magnetization ca
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`n be facilitated. Further, since the holes 44 c to 44 having different shapes are for
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`med so as to have the same volume as the other holes 44 b, a good rotational ba
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`lance can be obtained.
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`[0048]The motor 40 thus assembled is arranged in a fixed casing 31 which is fixe
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`d to an axle 20 in the rotary casing 23 which, as mentioned above, rotates with t
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`he rear wheel 14. As described above, the fixed casing 31 includes the main body
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`portion 31 a and the lid portion 31 b, and a motor 40 is disposed in the main bod
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`y portion 31 a, and a large pulley 34 and a tension pulley 38 that constitute a red
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`uction mechanism and a control board 33 that is disposed in the board case 32 ar
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`e attached to the lid portion 31 b. A Hall element 49 for detecting the position of t
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`he rotor 42 is mounted on the outside (back side) of the substrate case 32, and d
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`etects a rotor magnetic pole position for driving the motor. The substrate case 32
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`is positioned and fixed to the lid portion 31 b, and the Hall element 49 is also posi
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`tioned and mounted on the substrate case 32 in advance.
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`[0049 ]In assembling the fixed casing 31, first, the main body portion 31 a and th
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`e lid portion 31 b are assembled to each other, and then the lid portion 31 b is att
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`ached to the main body portion 31 a. Thus, positioning of the rotor 42 and the Ha
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`Il element 49 is completed.
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`[0050 Accordingly, by effectively utilizing the substrate case 32, assemblability is
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`improved, positioning of the rotor 42 and the Hall element 49 can be reliably perf
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`ormed, and accurate magnetic pole position detection of the rotor 42 can be perf
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`ormed.
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`[0051 ]Further, when the lid portion 31 b is attached to the main body portion 31
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`a, the winding terminal 31 a of the stator 31 is exposed from the terminal hole 41
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`p formed in the lid portion 41 b, and the power supply terminal 33 a from the con
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`trol board 33 drawn out through the lead-out hole 41 q formed in the lid portion 3
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`1 b is connected to the winding terminal 31 a. Thus, the connection of the windin
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`g terminal 40 a of the stator 41 and the feeding terminal 33 a of the control boar
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`d 33 is completed.
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`[0052]As described above, since the power supply terminal 33 a of the control bo
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`ard 33 is connected to the winding terminal 31 a of the stator 41 after the lid port
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`ion 41 b is attached, the lead wire is not loosened and interferes with the rotor 4
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`2, so that wiring can be easily performed, and connection processing of the wiring
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`can be easily performed.
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`[0053]Next, power transmission of the electric assisted bicycle configured as desc
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`ribed above will be described.
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`[0054]First, transmission of human power will be described.
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`[0055]When a human power driving force is input from a pedal 5, a front sprocke
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`t 12 fixed to a pedal 5 rotates, and a rear sprocket 22 rotates via a chain 13. Wh
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`en the rear sprocket 22 rotates, power is transmitted in only one direction by ao
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`ne way clutch (not shown).
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`[0056]When power in the traveling direction is transmitted, after the gear ratio is
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`changed by the transmission 21 set to the gear ratio instructed by the user, the r
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`otation casing 23 (23 a) is rotated while the spring 55 constituting the torque sen
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`sor is contracted, and the rear wheel 14 can be rotated.
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`[0057 ]Next, transmission of the electric driving force will be described.
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`[0058]The change in inductance detected by the coil 60 due to the displacement
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`of the ring 57 of the torque sensor described above is input as an electric signal i
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`nto the microcomputer of the control board 33. Then, based on the signal value,
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`a signal is output to a drive circuit of the motor 40, and the polarity of the stator
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`41 is changed by turning on / off the FET in the drive circuit to generate a rotatin
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`g magnetic field, whereby the rotor 42 is rotated by the magnet 46 provided in th
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`e rotor 42, and the motor 40 is rotationally driven. The rotational driving force of
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`the motor 40 is reduced by the reduction mechanism including the small pulley 4
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`7, the large pulley 34, the one way clutch 36, the small gear 37, and the large ge
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`ar 25, so that the rotating casing 23 (23 b) rotates, and the rear wheel 14 rotate
`Ss.
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`[0059]As described above, since the human power driving force and the electric d
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`riving force are combined by the rotary casing 23 (23 a, 23 b) to drive the rear w
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`heel 14, an electric driving force corresponding to a force of the user stepping on
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`the pedal 5 is applied, so that the vehicle can be easily run even on a slope.
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`[0060 ]Further, in this embodiment, the rotor 42 of the motor 40 is mounted ont
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`he internal transmission 21 mounted on the axle 20 of the rear wheel 14 via the
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`bearing 43. Since an internal type transmission 21 of an axle 20 is effectively use
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`d as a shaft of a motor 40 and a motor 40 itself is also reduced in weight by the c
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`onstitution described above, a lightweight and compact electric assisted bicycle c
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`an be realized.
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`[0061 ]In addition, although the present invention is applied to an electric assiste
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`d bicycle bicycle in the above embodiment, it is effective to apply the present inv
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`ention to a vehicle driven by a motor such as an assist type electric wheelchair.
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`[0062 ]Further, in the above embodiment, the present invention is applied to the
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`case in which the internal type transmission 21 is provided in the axle 20, but the
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`present invention is also applicable to a case in which no transmission is provided
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`in the axle.
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`[0063]As the position detection means of the rotor 42,
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`While a general Hall element 49 is used, a Hall IC in which a Hall element andac
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`omparator for shaping a waveform are integrated, a photointerrupter composed o
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`f a light emitter and a light receiver, and the like can be used.
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`[0064]
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`[Effect of the Invention] As described above, according to the present invention, t
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`here is provided a human power driving unit for driving a wheel by human power,
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`and an electric driving unit for driving the wheel by a motor that detects a magne
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`tic pole position of the rotor and controls a rotating magnetic field of the stator. A
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`substrate case for arranging a control substrate inside the cover part of the casin
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`g covering the motor, and a position detecting m