PATENT ABSTRACTS OF JAPAN
`
`(11)Publication number :
`
`2004-225545
`
`(43)Date of publication of application : 12.08.2004
`
`(51)[nt.Cl.
`
`F04D 29/28
`
`(21)Application number : 2003-010691 (71)Applicant : DENSO CORP
`
`(72)[nventor : KUWATA KATSUJI
`20.01.2003
`(22)Date of filing :
`Hm‘z‘fltflffzfifflfllfzmflbfiiffi‘fiifiifififlflfflmfimfiammmemsmrmmm:msmmassswmm1Wilmammmsmrmmmmumzmmm
`
`(54) BLOWER
`
`(57)Abstract:
`
`PROBLEM TO BE SOLVED: To finish a
`
`press-in process of a shaft at a time by
`
`temporarily fixing a fan and a cap.
`
`SOLUTION: In this blower, a motor shaft is
`
`pressed in the resin fan 10 and the resin cap. A
`
`male side fitting part 32 having a large number
`
`fitting part 14 having a large number of corner parts on an inner peripheral surface is formed
`
`of corner parts on an outer peripheral surface
`
`is formed in the cap 30. and a female side
`
`in the fan 10. and the motor shaft is pressed in
`
`in a state of temporarily fixing the fan 10 and
`
`the cap 30 by fitting the male side fitting part
`
`32 to the female side fitting part 14. Since the
`
`outer peripheral surface of the male side fitting part 32 and the inner peripheral
`
`surface of the female side fitting part 14 are brought into close contact only in a part
`
`in the peripheral direction and are not brought into close contact in a residual part.
`
`when fitting the male side fitting part 32 to the female side fitting part 14, the female
`
`side fitting part 14 can easily extend and contract (be elastically deformable) in a
`
`

`

`non-close contact part. Thus. a press-in load when pressing in the motor shaft can be
`
`reduced.
`
`* NOTICES *
`
`JPO and lNPIT are not responsible for any
`
`damages caused by the use of this translation.
`
`1.This document has been translated by computer. So the translation may not reflect
`
`the original precisely.
`
`2.**** shows the word which can not be translated.
`
`3.[n the drawings, any words are not translated.
`
`CLAIMS
`
`[Claim(s)]
`
`[Claim 1]
`
`A shaft (21) of the shape of a cylindrical shaft rotated by a driving means (20), A fan
`
`made of resin (10) which the aforementioned shaft (21) is pressed fit, and rotates
`
`with the aforementioned shaft (21). and blows out air, In an air blower provided with a
`
`cap made of resin (30) which the aforementioned shaft (21) is pressed fit, and fits in
`
`with the aforementioned fan (10), and transmits torque to the aforementioned fan
`
`(10)
`
`The male side fitting part (32) which has a many corner in an outer peripheral surface
`
`is formed in either the aforementioned fan (10) or the aforementioned cap (30),
`
`While having a many corner in an inner peripheral surface. the female side fitting part
`
`(14) in which the aforementioned male side fitting part (32) is pressed fit is formed in
`
`another side of the aforementioned fan (10) and the aforementioned cap (30),
`
`An air blower characterized by the adhesion part being the aforementioned corner
`
`while an outer peripheral surface of the aforementioned male side fitting part (32)
`
`and an inner peripheral surface of the aforementioned female side fitting part (14)
`
`stick in a part of hoop direction.
`
`[Claim 2]
`
`Hardness differs between aforementioned Hwang (10) and the aforementioned cap
`
`(30), and the aforementioned male side fitting part (32) is formed in the one where
`
`

`

`hardness is higher among aforementioned Hwang (10) and the aforementioned cap
`
`(30), The air blower according to claim 1, wherein the aforementioned female side
`
`fitting part (14) is formed in the one where hardness is lower among aforementioned
`
`Hwang (10) and the aforementioned cap (30).
`
`[Translation done.]
`
`* NOTICES *
`
`JPO and INPlT are not responsible for any
`
`damages caused by the use of this translation.
`
`1.This document has been translated by computer. So the translation may not reflect
`
`the original precisely.
`
`2.**** shows the word which can not be translated.
`
`3.In the drawings, any words are not translated.
`
`DETAILED DESCRIPTION
`
`[Detailed Description of the Invention]
`
`[0001]
`
`[Field of the Invention]
`
`The present invention relates especially to the fixing structure of a fan and a cap
`
`about the air blower which rotates the fan made of resin.
`
`[0002]
`
`[Description of the Prior Art]
`
`Conventionally, while pressing a cylindrical shaft-like shaft fit in the fan made of resin,
`
`this kind of air blower, By pressing a shaft fit in the cap made of metal or resin, and
`
`carrying out fitting of a fan and the cap, a fan is prevented from rotating to a shaft
`
`with a cap, namely, a baffle is performed.
`
`[0003]
`
`By the way, on the occasion of attachment of an air blower. if temporary fastening is
`
`possible for a fan and a cap, the press fitting process of a shaft can be finished at
`
`once by pressing a shaft fit. where temporary fastening of a fan and the cap is carried
`
`

`

`out. Then, these people proposed the air blower (henceforth the air blower of a prior
`
`invention) which enabled it to substitute the press fitting process of a shaft for the
`
`application for patent 2002-109303 at once.
`
`[0004]
`
`wand Fig.11 show the essential part composition of the air blower of the
`
`above-mentioned prior invention, and the cap 30,[t has the leg 35 which is Mukai and
`
`was extended to the fan 10 side from the cap boss section in which the shaft 21 is
`
`pressed fit, and the fan 10 is provided with the concave part 16 where fitting of the
`
`leg 35 is carried out, and the protruding parts 17 and 18 in which a point carries out
`
`plastic deformation and which are stuck to the leg 35. And temporary fastening of the
`
`fan 10 and the cap 30 is carried out by carrying out plastic deformation of the point
`
`of the protruding parts 17 and 18, and making it stick to the leg 35. Subsequently, it
`
`enables it to finish the press fitting process of the shaft 21 at once by pressing the
`shaft 21 fit, where temporary fastening of the fan 10 and the cap 30 is carried out.
`
`[0005]
`
`[Problem to be solved by the invention]
`
`However, in the air blower of a prior invention, when it carries out too much largely.
`
`the plastic deformation irreversible deformation, i.e., the press fit cost, of the
`
`protruding parts 17 and 18, the press fit load at the time of shaft press fit becomes
`
`largely, and there is a possibility that the bearing of the motor holding a shaft may be
`
`damaged by that cause. On the other hand, if press fit cost is made small too much, it
`
`will be expected that the gap between hoop directions (backlash) is made between
`
`the protruding parts 17 and 18 and the leg 31 (torque transmission part). If the
`
`backlash is made, problems, like the protruding parts 17 and 18 and the leg 35 collide
`
`at the time of a rotation start, by that cause, between the cap 30 and the shaft 21, an
`
`allophone occurs, or big torque acts and the cap 30 and the shaft 21 are slippery may
`
`arise. Therefore, it is necessary to set up strictly the press fit cost of the protruding
`
`parts 17 and 18 in the air blower of a prior invention.
`
`[0006]
`
`An object of the present invention is to solve beforehand the problem expected with
`
`the air blower of a prior invention, while enabling it to finish the press fitting process
`
`of a shaft at once, even when it was made in view of the above-mentioned point, and
`
`both a fan and a cap are the products made of resin.
`
`[0007]
`
`[Means for solving problem]
`
`To achieve the above objects, in the invention according to claim 1, The shaft (21) of
`
`

`

`the shape of a cylindrical shaft rotated by a driving means (20), The fan made of resin
`
`(10) which a shaft (21) is pressed fit, and rotates with a shaft (21), and blows out air.
`
`In an air blower provided with the cap made of resin (30) which a shaft (21) is pressed
`
`fit, and fits in with a fan (10), and transmits torque to a fan (10), The male side fitting
`
`part (32) which has a many corner in an outer peripheral surface is formed in either a
`
`fan (10) or a cap (30), The female side fitting part (14) in which the male side fitting
`
`part (32) is pressed fit while having a many corner in an inner peripheral surface,
`
`While it is formed in a fan (10) and another side of a cap (30) and the outer peripheral
`
`surface of the male side fitting part (32) and the inner peripheral surface of the
`
`female side fitting part (14) stick in a part of hoop direction, it is characterized by the
`
`adhesion part being a corner.
`
`[0008]
`
`According to this, since temporary fastening of a fan and the cap can be carried out.
`
`the press fitting process of a shaft can be finished at once by pressing a shaft fit,
`
`where temporary fastening of a fan and the cap is carried out.
`
`[0009]
`
`Since the male side fitting part and the female side fitting part have stuck by the
`
`corner, the backlash of a hoop direction does not occur but the baffle of a fan can be
`
`performed reliably.
`
`[0010]
`
`When they press the male side fitting part fit in the female side fitting part, the
`
`female side fitting part can expand [the outer peripheral surface of the male side
`
`fitting part and the inner peripheral surface of the female side fitting part are stuck in
`
`a part of hoop direction, and / since it has not stuck ] them with the remainder, and
`
`contract easily in a non-sticking part (elastic deformation). Therefore, since it
`
`becomes unnecessary to be able to reduce the press fit load at the time of shaft
`
`press fit, and to set up press fit cost strictly by extension, the dimensional tolerance
`
`of press fit cost can be carried out more largely than before.
`
`[0011]
`
`[n the invention according to claim 2, hardness differs between a fan (10) and a cap
`
`(30), The male side fitting part (32) is formed in the one where hardness is higher
`
`among a fan (10) and a cap (30), and the female side fitting part (14) is formed in the
`
`one where hardness is lower among the fan (10) and the cap (30).
`
`[0012]
`
`Since the female side fitting part is formed in the one where hardness is lower, are
`
`and it contracts easy to expand the female side fitting part. therefore according to
`
`

`

`this, the press fit load at the time of shaft press fit can be reduced further.
`
`[0013]
`
`Incidentally. the code in the parenthesis of each above-mentioned means is an
`
`example which shows correspondency with the concrete means of the description to
`
`the embodiment mentioned later.
`
`[0014]
`
`[Mode for carrying out the invention]
`
`(A 1st embodiment)
`
`This embodiment applies the air blower concerning the present invention to the
`
`centrifugal type blower of the air-conditioner for vehicles, The front view showing
`
`some centrifugal type blowers (henceforth an air blower) which require Eigifor this
`
`embodiment in a section, The front sectional view of the essential part of the fan 10
`
`of Fig.1 and flg;2_(b) Ejg._2_(a) The plan view of the essential part of the fan 10 of
`
`Fig.1,lt is a cross sectional view of an essential part showing the state where the
`
`mimetic diagram and Fig.4 (a) in which the form in the free state of the female side
`
`fitting part [ in / in Ejgi/ the fan 10 of Fig.1 ] 14 is shown carry out the front
`
`sectional view of the cap 30 of Fig.1, Fig.4 (b) carries out the bottom view of the cap
`
`30 of Fig.1, and Fig.5 carried out fitting of the fan 10 of Fig.1, and the cap 30.
`
`[0015]
`
`The air blower is provided with the cap 30 which transmits the torque of the
`
`centrifugal type multiblade fan (henceforth a fan) 10 which turns to the
`
`radial—direction outside the air sucked from the direction of axis-of—rotation A. and
`
`blows it out, the electric motor 20 which rotates the fan 10, and the electric motor 20
`
`to the fan 10 in Eigl.
`
`[0016]
`
`The electric motor 20 is equivalent to the driving means of the present invention, it
`
`has the shaft 21, and, as for this shaft 21. the section is formed in the shape of a
`
`cylindrical shaft by metal.
`
`[0017]
`
`The fan 10 is connected with the cylindrical Van Bosch part 11 and the Van Bosch
`
`part 11. and has the shaft 21 and the wings (blade) 12 of two or more sheets rotated
`
`integrally. Incidentally, the Van Bosch part 11 and the blade 12 are formed integrally
`
`according to the construction material which hardness is lower than the cap 30 and
`
`was rich in elasticity, for example, thermoplastics like polypropylene.
`
`[0018]
`
`As shown in Egg, the shaft fitting hole part 13 in which the shaft 21 is pressed fit,
`
`

`

`and the female side fitting part 14 to which it is arranged at the cap 30 side and
`
`fitting of the male side fitting part 32 (detailed after-mentioned) of the cap 30 is
`
`carried out rather than the shaft fitting hole part 13 are formed in the Van Bosch part
`
`11. flgiis a section perpendicular to the axis of rotation A. a solid line shows the
`
`form in the free state of female side fitting part 14 inner peripheral surface, a dashed
`
`line is a right hexagon and the form in the free state of female side fitting part 14
`
`inner peripheral surface serves as a non-right hexagon clearly after this.
`
`[0019]
`
`The cap 30 consists of resin whose hardness is higher than the fan 10, and consists
`
`of resin with high tensile strength like the glass reinforcement of nylon, for example.
`
`As shown in fig} the shaft fitting hole part 31 in which the shaft 21 is pressed fit,
`
`and the male side fitting part 32 by which fitting is carried out to the female side
`
`fitting part 14 of the fan 10 are formed in the cap 30. The form in the free state of
`
`male side fitting part 32 outer peripheral surface serves as a right hexagon.
`
`[0020]
`
`And as shown in Egg, when carrying out fitting of the male side fitting part 32 of the
`
`cap 30 to the female side fitting part 14 of the fan 10, two corners stick among six
`
`corners each of the female side fitting part 14 and the male side fitting part 32. The
`
`code B shows the adhesion part.
`
`[0021]
`
`On the occasion of attachment of the above—mentioned air blower, first, the male
`
`side fitting part 32 of the cap 30 is fitted into the female side fitting part 14 of the fan
`
`10, and temporary fastening of the cap 30 is carried out with the fan 10. When fitting
`
`into the female side fitting part 14, the female side fitting part 14 can expand [ since
`
`the outer peripheral surface of the male side fitting part 32 and the inner peripheral
`
`surface of the female side fitting part 14 are stuck in a part of hoop direction
`
`(adhesion part B) and are not stuck with the remainder at this time ] the male side
`
`fitting part 32 and contract easily in a non-sticking part (elastic deformation).
`
`Incidentally, the adhesion part B is a press fitting state.
`
`[0022]
`
`The shaft 21 is pressed fit in the fan 10 and the cap 30 after this temporary fastening.
`
`Since the adhesion part B is a press fitting state, the torque from the shaft 21 is
`
`transmited to the fan 10 via the cap 30 by it, while it is directly transmited to the fan
`
`10 by this press fit. However, the baffle torque of the cap 30 and the shaft 21 after
`
`press fit so that it may become largely rather than the baffle torque of the fan 10 and
`
`the shaft 21. Contact pressure, a touch area, etc. are set up, therefore the torque
`
`

`

`from the shaft 21 is mainly transmited to the fan 10 via the cap 30.
`
`[0023]
`
`At this embodiment, since temporary fastening of the fan 10 and the cap 30 can be
`
`carried out, the press fitting process of the shaft 21 can be finished at once by
`
`pressing the shaft 21 fit, where temporary fastening of the fan 10 and the cap 30 is
`carried out.
`
`[0024]
`
`Since the male side fitting part 32 and the female side fitting part 14 stick by a corner
`
`and the adhesion part B has become a press fitting state. the backlash of a hoop
`
`direction does not occur but the baffle of the fan 10 can be performed reliably.
`
`[0025]
`
`When fitting into the female side fitting part 14, the female side fitting part 14 can
`
`expand [ since the outer peripheral surface of the male side fitting part 32 and the
`
`inner peripheral surface of the female side fitting part 14 are stuck in a part of hoop
`direction and are not stuck with the remainder] the male side fitting part 32 and
`
`contract easily in a non-sticking part (elastic deformation). Therefore, since it
`
`becomes unnecessary to be able to reduce the press fit load at the time of shaft 21
`
`press fit, and to set up press fit cost strictly by extension, the dimensional tolerance
`
`' of press fit cost can be carried out more largely than before.
`
`[0026]
`
`Since the female side fitting part 14 is formed in the one where hardness is lower
`
`further again. are and it contracts easy to expand the female side fitting part 14,
`
`therefore the press fit load at the time of shaft 21 press fit can be reduced further.
`
`[0027]
`
`The fan 10 of this embodiment may be molded by resin with high tensile strength like
`
`the glass reinforcement of nylon.
`
`[0028]
`
`Except a hexagon may be sufficient as the inner peripheral surface form of the
`
`female side fitting part 14, and the outer peripheral surface shape of the male side
`
`fitting part 32, for example, they are good as for a pentagon, an octagon, etc.
`
`[0029]
`
`Inner peripheral surface form of the female side fitting part 14 is made into a regular
`
`polygon, and it is good also considering the outer peripheral surface shape of the
`
`male side fitting part 32 as a non regular polygon.
`
`[0030]
`
`The male side fitting part may be formed in the fan 10. and the female side fitting part
`
`

`

`may be formed in the cap 30.
`
`[0031]
`
`(A 2nd embodiment)
`
`According to the above-mentioned embodiment, to having made the male side fitting
`
`part 32 and the female side fitting part 14 into the polygonal shape (specifically
`
`hexagon), n square shape and the female side fitting part 14 are made into a 2n
`
`square shape, and other points are common in this embodiment in the
`
`above-mentioned embodiment in the male side fitting part 32.
`
`[0032]
`
`The front sectional view of the essential part of the fan 10 of this embodiment and
`
`ELMb) flgfih) The plan view of the essential part of the fan 10 of this embodiment,
`[t is a cross sectional view of an essential part showing the state where Eigi(a)
`
`carries out the front sectional view of the cap 30 of this embodiment, Eigl(b) carries
`
`out the bottom view of the cap 30 of this embodiment, and Fig.8 carried out fitting of
`
`the fan 10 of this embodiment, and the cap 30.The same or code same into an equal
`
`portion as a 1st embodiment is attached, and the description is omitted.
`
`[0033]
`
`[n the cap 30 of this embodiment, the form of male side fitting part 32 outer
`
`peripheral surface serves as a pentagon. As for Hwang 10, the form of female side
`
`fitting part 14 inner peripheral surface has a decagon. As shown in Eigfi, when
`
`carrying out fitting of the male side fitting part 32 of the cap 30 to Hwang's 10 female
`
`side fitting part 14, five corners and five corners of the male side fitting part 32 stick
`
`among ten corners of the female side fitting part 14. When fitting into the female side
`
`fitting part 14, the female side fitting part 14 can expand [that is, / since the outer
`
`peripheral surface of the male side fitting part 32 and the inner peripheral surface of
`
`the female side fitting part 14 are stuck in a part of hoop direction (adhesion part B)
`
`and are not stuck with the remainder] the male side fitting part 32 and contract
`
`easily in a non-sticking part (elastic deformation). According to this embodiment, the
`
`same effect as a 1st embodiment is acquired.
`
`[0034]
`
`The form of male side fitting part 32 outer peripheral surface and the form of female
`
`side fitting part 14 inner peripheral surface may not be the combination of a pentagon
`
`and a decagon. for example, make a hexagon form of male side fitting part 32 outer
`
`peripheral surface, and are good also considering the form of female side fitting part
`
`14 inner peripheral surface as dodecagon.
`
`[0035]
`
`

`

`[t is good in the female side fitting part 14 also considering n square shape and the
`male side fitting part 32 as a 2n square shape. The male side fitting part may be
`formed in the fan 10. and the female side fitting part may be formed in the cap 30.
`
`[0036]
`As long as a corner will stick the form of male side fitting part 32 outer peripheral
`surface, and the form of female side fitting part 14 inner peripheral surface and they
`
`will be in a press fitting state, they may not be a regular polygon-like.
`
`[0037]
`
`The form of male side fitting part 32 outer peripheral surface and the form of female
`
`side fitting part 14 inner peripheral surface may not be the combination of n square
`shape and a 2n square shape, for example, the combination of n square shape and a
`3n square shape may be sufficient as the form of male side fitting part 32 outer
`peripheral surface like dodecagon in the form of a quadrangle and female side fitting
`
`part 14 inner peripheral surface.
`
`[0038]
`
`Star—shaped form as shows the form of male side fitting part 32 outer peripheral
`
`surface to Eiggmot only in simple geometry, for example may be sufficient as the
`form of male side fitting part 32 outer peripheral surface. and the form of female side
`fitting part 14 inner peripheral surface; In this case, the form of female side fitting
`part 14 inner peripheral surface is good to consider it as a pentagon or a decagon.
`
`[Brief Description of the Drawings]
`[Drawing 1]lt is a front view showing some air blowers concerning a 1st embodiment
`
`of the present invention in a section.
`[Drawing 2]lt is the front sectional view and plan view of an essential part of Ei_g_1.
`
`[ of the fan 10]
`
`[Drawing 3]lt is a mimetic diagram showing the form in the free state of the female
`
`side fitting part 14 in the fan 10 of Eig_1.
`[Drawing 4][t is the front sectional view and bottom view of the cap 30 of Ei_g_1.
`[Drawing 5]lt is a cross sectional view of an essential part showing the state where
`
`fitting of Hwang 10 of Eigiand the cap 30 was carried out.
`[Drawing 6]lt is the front sectional view and plan view of an essential part of Hwang
`
`10 in the air blower concerning a 2nd embodiment.
`
`[Drawing 7]lt is the front sectional view and bottom view of the cap 30 in the air
`
`blower concerning a 2nd embodiment.
`
`[Drawing 8]lt is a cross sectional view of an essential part showing the state where
`fitting of the fan 10 and the cap 30 in the air blower concerning a 2nd embodiment
`
`

`

`was carried out.
`
`[Drawing 9]lt is a mimetic diagram showing the modification of the cap 30 in the air
`
`blower concerning a 2nd embodiment.
`[Drawing 10]lt is a cross sectional view of an essential part showing the air blower of
`
`a prior invention.
`[Drawing 11]It is a cross sectional view which is along the C‘C line of flg_1_(_).
`
`[Explanations of letters or numerals]
`1O —- fan, 14 -- the female side fitting part, 20 —- electric motor (driving means), 21
`
`- shaft, 30 -- cap. 32 —- the male side fitting part.
`
`[Translation done.]
`
`