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`JP 2015-193062 A 2015.11.5
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`JP 2015-193062 A 2015.11.5
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`JP 2015-193062 A 2015.11.5
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`JP 2015-193062 A 2015.11.5
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`JP 2015-193062 A 2015.11.5
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`(8)
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`JP 2015-193062 A 2015.11.5
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`JP 2015-193062 A 2015.11.5
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`JP 2015-193062 A 2015.11.5
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`Notice
`This translation is machine-generated. It cannot be guaranteedthatit is intelligible, accurate,
`complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
`financial decisions, should not be based on machine-translation output.
`
`DESCRIPTION J P2015193062A
`10 The present invention relates to an impact tool attachment and an impacttool.
`
`[0001]
`14 The present invention relates to an attachment and an impact tool used for coupling an output
`shaft of an impact tool and a socket attached to the outputshaft.
`
`[0002]
`79 An output shaft of an impact tool is usually connected to a memberto be fastened such as a
`bolt or a nut via a socket, and a rotary impact is applied to the memberto be fastened from
`the output shaft through the socket.
`
`[0003]
`25 Incidentally, the socket is mounted on the output shaft by providing a rectangular shaft
`portion having a rectangular cross section at the tip of the output shaft, providing a
`rectangular hole on the socketside, and fitting the rectangular shaft portion into the
`rectangular hole of the socket.
`
`[0004]
`32 Such play is not a problem when applying continuous torque, but power efficiency is reduced
`in an impact tool that applies a rotary impact.
`34 In addition, in a case where the tightening operation is stopped by shut-off at the time when
`the tightening torque reachesthe set value, the accuracy of the detection value of the
`tightening torque is greatly reduced.
`
`04-11-2022
`
`1
`
`

`

`[0005]
`40 Japanese Patent Laid-Open No. 2002-210671 discloses a socket in which a member for
`eliminating a rattling in a rotation direction between the socket and the output shaftis
`provided, but the socket needs various kinds of socket according to a nominal diameter, a
`shape, and the like of a memberto be fastened, and it is general to use a general-purpose
`product, and it is not practical to require a dedicated socket.
`
`[0006]
`48 <patcit num="1"> <text> HERA 2002- 21067 154)#8 </text> </patcit>
`
`[0007]
`52 The present invention has been made in view of the above problems, and an object of the
`present invention is to provide an impact tool attachment and an impact tool that can
`effectively suppressrattling in a rotation direction between an output shaft and a socket even
`when a socket as a general-purpose productis used, thereby increasing power efficiency of an
`impact tool and improving management accuracy in a case of performing tightening torque
`management.
`
`[0008]
`61 An impact tool attachment according to the present invention is for an impact tool including
`an outputshaft to which a rotary impact about an axis is applied by an impact generation
`mechanism and to which a socket is detachably coupled, and is characterized in that the
`impact tool attachment is attached to the output shaft including a rectangular shaft portion
`fitted into a rectangular hole of the socket, and includes a regulating member that comesinto
`contact with an outer peripheral surface of the socket to regulate a movementof the socket
`about the axis with respect to the output shaft.
`
`[0009]
`71 The regulating member is preferably a frictional resistance material having a small resistance
`in one rotation direction about an axis with respect to an output shaft of the socket and a large
`resistance in a reverse rotation direction, and the regulating member is preferably an elastic
`body.
`
`[0010]
`78 The regulating member may bias the socket in one rotational direction about an axis, and the
`regulating member may be a one-wayclutch.
`
`04-11-2022
`
`2
`
`

`

`so Further, the restriction member may be configured to fix the socket to the output shaft by
`tightening the outer peripheral surface of the socket by relative rotation with respect to the
`output shaft.
`
`[0011]
`s6 The impact tool attachment according to the present invention is for an impact tool including
`an outputshaft to which a rotary impact about an axis is applied by an impact generating
`mechanism and to which a socket is detachably connected, and has another feature that the
`impact tool attachment is attached to the output shaft including a square shaft portion fitted
`into a square hole of the socket, and includes a contact portion that comes into contact with an
`axial end surface of the socket to add frictional resistance to a movementof the socket about
`
`the axis with respect to the output shaft.
`93 The impact tool attachment according to the present invention is for an impact tool including
`an outputshaft to which a rotary impact about an axis is applied by an impact generating
`mechanism and to which a socket is detachably connected, and is mounted on a square shaft
`portion of the output shaft including a square shaft portion fitted into a square hole of the
`socket, and further includes a protrusion that is in contact with an inner surface of the square
`hole of the socket on an outer surface of the square shaft portion and near one corner portion
`to press the socket in one direction about the axis with respect to the square shaft portion.
`
`[0012]
`103 The protrusion may be made ofan elastic body.
`
`[0013]
`107 The impact tool according to the presentinvention is characterized by including the
`attachment according to each of the above inventions.
`
`[0014]
`112 In addition, the impact tool according to the present invention is an impact tool including an
`output shaft to which a rotary impact about an axis is applied by an impact generation
`mechanism and to which a socket is detachably connected, and the output shaft includes a
`contact portion that comes into contact with an axial end surface of the socket and adds
`frictional resistance to a movement of the socket about the axis with respect to the output
`shaft, the output shaft including a square shaft portion that is fitted into a square hole of the
`socket.
`
`[0015]
`
`04-11-2022
`
`3
`
`

`

`122 The present invention further has another feature in that an impact tool including an output
`shaft to which a rotary impact about an axis is applied by an impact generating mechanism
`and to which a socket is detachably connected includes a movable piece that surrounds an
`outer surface of a square shaft portion of the output shaft and is fitted into a square hole of
`the socket together with the square shaft portion, and is movable with respect to the square
`shaft portion in a direction about the axis of the output shaft and a direction orthogonal to
`the axis, and a click engaging portion that determines a positional relationship between the
`movable piece and the square shaft portion in which the outer surface is brought into
`contact with an inner surface of the square hole by rotation of the square shaft portion with
`respect to the movable piece.
`
`[0016]
`135 Further, in an impact tool including an output shaft to which a rotary impact about an axis is
`applied by an impact generating mechanism and to which a socket is detachably connected,
`the output shaft including a square shaft portion to be fitted into a square hole of the socket
`has another feature that the output shaft includes a through hole through which a pin for
`retaining is inserted in the square shaft portion, and the through hole is formed to be
`inclined in the axis direction with respect to an outer surface of the square shaft portion.
`
`[0017]
`144 In addition, the present invention may be an impact tool including an output shaft to which a
`rotary impact about an axis is applied by an impact generation mechanism and to which a
`socket is detachably connected, wherein the output shaft including a square shaft portion
`fitted into a square hole of the socket includes a protrusion that comes into contact with an
`inner surface of the square hole of the socket and presses the socket against the square shaft
`portion in one direction about the axis on an outer surface of the square shaft portion and
`near one corner portion, and the protrusion may bea ball of a ball detent mechanism
`disposed in a through hole inclined in the direction about the axis with respect to the outer
`surface of the square shaft portion.
`
`[0018]
`156 The impact tool according to any one of the above-described aspects is also characterized by
`including a torque sensor that measures torque applied to an output shaft, a calculation unit
`that calculates a tightening torque applied to a tightening member driven via the socket
`based on an output of the torque sensor, and a control unit that controls an operation of the
`impact generation mechanism according to a value of the obtained tightening torque.
`
`[0019]
`
`04-11-2022
`
`4
`
`

`

`164 In the present invention, since the movement of the socket about the axis with respect to the
`output shaft is restricted, rattling caused by the clearance betweenthe output shaft and the
`socket is suppressed when the impact by the impact mechanism is applied to the output
`shaft, and this suppression can reduce waste of power and can more accurately measure the
`tightening bolt for torque control.
`
`[0020]
`172 It is a block diagram of one embodimentof this invention.
`173 It is explanatory drawing aboutthe rotation angle for the acceleration calculation on the
`same.
`
`175 It is a partial longitudinal sectional view of the output shaft and socket of the same above.
`176 It is a partial longitudinal sectional view of the output shaft and the socket in another
`example.
`178 Further, it is a partial longitudinal sectional view of the output shaft and the socket in another
`example.
`780 It is a sectional side view of another example.
`181 It is a sectional side view at the time of connecting the output shaft and the socket on the
`same.
`
`183 It is a sectional side view ofstill another example.
`184 It is a sectional side view at the time of connecting the output shaft and the socket on the
`same.
`
`186 It is sectional drawing of another example.
`187 Still another example is shown below. (a) is a longitudinal cross-sectional view. (b) is a cross-
`sectional view.
`
`189 Other examples are given below. (a) is a longitudinal cross-sectional view. (b) is a cross-
`sectional view taken along line A-A.
`197 It is a longitudinal sectional view of another example.
`192 It is a longitudinal sectional view ofstill another example.
`793 It is a longitudinal sectional view of another example.
`194 It is a longitudinal sectional view of different examples.
`195 It is sectional drawing which showsthe operation of the same.
`196 The above-described other examples are shown. (a) is an exploded longitudinal cross-sectional
`view. (b) is a longitudinal sectional view taken along line B-B.
`198 It is sectional drawing at the time of click engagement on the same.
`199 It is sectional drawing of another example.
`200 It is sectional drawing of another example.
`201 It is sectional drawing of another example.
`202 (a) (b) (c) is a cross-sectional view of each different example.
`
`[0021]
`
`04-11-2022
`
`5
`
`

`

`206 Hereinafter, the present invention will be described in detail based on the illustrated
`embodiments, and in the drawings, reference numeral 1 denotes a motor as a driving source,
`and rotation of the motor 1
`is transmitted to a driving shaft 11 via a speed reducer 10
`having a predetermined speed reduction ratio.
`210 A hammer 2 is attached to the drive shaft 11 via a cam mechanism (not shown), and the
`hammer 2 is urged toward the output shaft 3 by a spring 12.
`
`[0022]
`275 The output shaft 3 has an anvil 30 having an engaging portion that engages with the hammer
`2 in the rotational direction, and the hammer2 and the output shaft 3 rotate integrally when
`no load is applied to the output shaft 3.
`2178 However, when a load equal to or greater than a predetermined value is applied to the output
`shaft 3, the hammer 2 moves backward against the spring 12, and the hammer 2 moves
`forward while rotating at the next point when the engagement with the anvil 30 is released,
`and a striking impact in the rotation direction is applied to the anvil 30 (output shaft 3),
`thereby rotating the output shaft 3.
`223 Therefore, in this embodiment, the hammer 2, the spring 12, and the cam mechanism
`constitute an impact mechanism.
`
`[0023]
`228 The outputshaft 3 includes a square shaft portion 31 at a tip end portion thereof.
`229 In the illustrated example, the rectangular shaft portion 31 having a rectangular cross section
`in a direction orthogonal to the axial direction is connected to the socket 4 by being fitted
`into a rectangular hole 41 provided at one end side of the socket 4.
`
`[0024]
`235 The socket 4 is provided with the 2nd square hole 42 whosecrosssection in the direction
`orthogonal to the axial direction is hexagonal, for example, in the other end side, and this
`2nd square hole 42 is fitted with the head part of the bolt which is a to-be-clamped member,
`and a nut.
`
`239 Therefore, when the socket 4 mounted on the outputshaft 3 is fitted to a member to be
`fastened such as a head portion of a bolt or a nut and the impact mechanism is operated, the
`rotary impact applied to the output shaft 3 is applied to the member to be fastened via the
`output shaft 3 and the socket 4.
`
`[0025]
`246 The impacttool further includes a torque sensor 7 for measuring a torque Ts applied to the
`output shaft 3, a calculation unit 8 for calculating a tightening torque Tb applied to a
`
`04-11-2022
`
`6
`
`

`

`member to be tightened driven via the socket 4 based on an output of the torque sensor 7,
`and a control unit 9 for controlling an operation of the impact generating mechanism in
`accordance with a value of the obtained tightening torque Tb.
`251 As the torque sensor 7, a strain sensor attached to the output shaft 7 can be used.
`
`[0026]
`255 The calculation unit 8 obtains the tightening torque Tb by subtracting a multiplication value
`of the moment ofinertia I and the angular acceleration a of