JP2021038805A - motor - Google Patents

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JP2021038805A
JP2021038805A JP2019160657A JP2019160657A JP2021038805A JP 2021038805 A JP2021038805 A JP 2021038805A JP 2019160657 A JP2019160657 A JP 2019160657A JP 2019160657 A JP2019160657 A JP 2019160657A JP 2021038805 A JP2021038805 A JP 2021038805A
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drive
insertion hole
elastic member
shaft
driven
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JP7215374B2 (en
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和陽 松ヶ谷
Kazuharu Matsugaya
和陽 松ヶ谷
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Denso Corp
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Denso Corp
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Abstract

To provide a motor capable of suppressing the deterioration of durability of a driving side elastic member provided on an inner peripheral surface of a driving shaft insertion hole.SOLUTION: A coupling member 62 is equipped with a driving shaft insertion hole 72 with which a driving side inserting portion 31 of a rotary shaft 24 is engaged in a rotating direction. The driving side inserting portion 31 has a width across flat portion 32 of a width across flat shape equipped with an outer peripheral surface having a pair of plane portions 32a and a pair of curved surface portions 32b. The driving shaft insertion hole 72 has a width across flat hole portion 72a which forms a width across flat shape equipped with an inner peripheral surface having a pair of coupling plane portions 72c and a pair of coupling curved surface portions 72d, and in which the width across flat portion 32 is inserted. Between the plane portion 32a and the coupling plane portion 72c opposite to each other, and between the curved surface portion 32b and the coupling curved surface portion 72d opposite to each other, a driving side permission gap G1 is provided. The coupling curved surface portion 72d is provided with a driving side elastic member 74 having elasticity and pressing the curved surface portion 32b inward in a diametrical direction. Both end portions in a circumferential direction of the coupling plane portion 72c is exposed to the inside of the driving shaft insertion hole 72.SELECTED DRAWING: Figure 6

Description

本開示は、モータに関する。 The present disclosure relates to a motor.

従来、モータには、回転される回転軸と、回転軸と同軸上に配置されるウォーム軸とをクラッチにて一体回転可能に連結したものがある。例えば特許文献１に記載されたモータでは、クラッチは、回転軸とウォーム軸とを連結部材を介して一体回転可能に連結する。回転軸は、連結部材に設けられた駆動軸挿入孔に挿入される駆動側挿入部を有する。駆動側挿入部は、互いに平行をなす一対の平面部と一対の平面部の間に位置する一対の曲面部とを有する外周面を備えた二面幅形状の二面幅部を有する。駆動軸挿入孔は、互いに平行をなす一対の連結平面部と一対の連結平面部の間に位置する一対の連結曲面部とを有する内周面を備え、駆動側挿入部の二面幅部より一回り大きい二面幅形状をなしている。そのため、駆動側挿入部の二面幅部は、駆動軸挿入孔に遊嵌されることになる。また、駆動軸挿入孔の各連結平面部は、当該各連結平面部の周方向の一端から他端にわたって弾性を有する駆動側弾性部材にて覆われている。駆動側弾性部材は、二面幅部の平面部を径方向内側に押圧する。そのため、モータの組立て時において、回転軸の先端部に装着された連結部材は、駆動側弾性部材によって回転軸から脱落しないように弾圧保持される。従って、モータの組立ての作業性が向上されている。 Conventionally, there is a motor in which a rotating shaft and a worm shaft arranged coaxially with the rotating shaft are integrally rotatably connected by a clutch. For example, in the motor described in Patent Document 1, the clutch connects the rotating shaft and the worm shaft integrally and rotatably via a connecting member. The rotating shaft has a drive-side insertion portion that is inserted into a drive shaft insertion hole provided in the connecting member. The drive-side insertion portion has a width across flats having an outer peripheral surface having a pair of flat surfaces parallel to each other and a pair of curved surfaces located between the pair of flat surfaces. The drive shaft insertion hole is provided with an inner peripheral surface having a pair of connecting flat surfaces parallel to each other and a pair of connecting curved surfaces located between the pair of connecting flat surfaces, and is provided from the width across flats of the drive side insertion portion. It has a two-sided width shape that is one size larger. Therefore, the width across flats of the drive-side insertion portion is loosely fitted into the drive shaft insertion hole. Further, each connecting flat surface portion of the drive shaft insertion hole is covered with a driving side elastic member having elasticity from one end to the other end in the circumferential direction of each connecting flat surface portion. The drive-side elastic member presses the flat surface portion of the width across flats inward in the radial direction. Therefore, at the time of assembling the motor, the connecting member attached to the tip end portion of the rotating shaft is repressively held by the driving side elastic member so as not to fall off from the rotating shaft. Therefore, the workability of assembling the motor is improved.

そして、特許文献１に記載されたモータでは、組付け部分の誤差等によって回転軸と連結部材との間に軸ずれが生じた場合であっても、駆動側挿入部の二面幅部が駆動軸挿入孔に遊嵌されているために、当該軸ずれが許容される。この場合、駆動側弾性部材は、弾性変形することにより、駆動軸挿入孔に対する二面幅部の径方向の相対移動を許容する。従って、回転軸の回転時に回転軸と連結部材との連結部分に大きな径方向の荷重が生じることが抑制されている。その結果、回転軸の回転時に、回転軸と連結部材との連結部分で大きな異音や振動が発生することが抑制される。 Then, in the motor described in Patent Document 1, even when an axial deviation occurs between the rotating shaft and the connecting member due to an error in the assembled portion or the like, the width across flats of the driving side insertion portion is driven. Since it is loosely fitted in the shaft insertion hole, the shaft deviation is allowed. In this case, the drive-side elastic member is elastically deformed to allow relative movement of the width across flats with respect to the drive shaft insertion hole in the radial direction. Therefore, it is suppressed that a large radial load is generated at the connecting portion between the rotating shaft and the connecting member when the rotating shaft rotates. As a result, when the rotating shaft is rotated, it is possible to suppress the generation of a large abnormal noise or vibration at the connecting portion between the rotating shaft and the connecting member.

特開２００３−２７８７８４号公報Japanese Unexamined Patent Publication No. 2003-278784

ところで、特許文献１に記載されたモータでは、駆動軸挿入孔と回転方向に係合する二面幅部は、二面幅形状をなすために、平面部と曲面部との境界部分に軸方向に延びる角部を有する。そして、回転軸の回転時において二面幅部が駆動軸挿入孔と回転方向に係合する際には、当該角部が駆動側弾性部材に押し付けられることになる。そのため、駆動側弾性部材に当該角部が繰り返し押し付けられることにより、駆動側弾性部材が断裂する等して同駆動側弾性部材の耐久性が低下するおそれがあった。 By the way, in the motor described in Patent Document 1, the two-sided width portion that engages with the drive shaft insertion hole in the rotational direction has an axial direction at the boundary portion between the flat surface portion and the curved surface portion in order to form a two-sided width shape. It has a corner extending to. Then, when the width across flats engages with the drive shaft insertion hole in the rotation direction during rotation of the rotation shaft, the corner portion is pressed against the drive-side elastic member. Therefore, when the corner portion is repeatedly pressed against the drive-side elastic member, the drive-side elastic member may be torn and the durability of the drive-side elastic member may be lowered.

本開示の目的は、駆動軸挿入孔の内周面に設けられる駆動側弾性部材の耐久性の低下を抑制できるモータを提供することにある。 An object of the present disclosure is to provide a motor capable of suppressing a decrease in durability of a drive-side elastic member provided on an inner peripheral surface of a drive shaft insertion hole.

本開示のモータは、回転される回転軸（２４）と、前記回転軸と同軸となるように配置されるウォーム軸（５２）を含む減速機構（５１）と、前記回転軸と前記ウォーム軸とを一体回転可能に連結する連結部材（６２）を有するクラッチ（１３）とを備え、前記回転軸は、前記回転軸の先端部に駆動側挿入部（３１）を有し、前記ウォーム軸は、前記ウォーム軸の基端部に従動側挿入部（１０２）を有し、前記連結部材は、前記駆動側挿入部が挿入され前記駆動側挿入部が回転方向に係合する内周面を有する駆動軸挿入孔（７２）と、前記従動側挿入部が挿入され前記従動側挿入部が回転方向に係合する内周面を有する従動軸挿入孔（７５）とを備え、前記駆動側挿入部は、互いに平行をなす一対の平面部（３２ａ）と前記一対の平面部の間に位置する一対の曲面部（３２ｂ）とを有する外周面を備えた二面幅形状の二面幅部（３２）を有し、前記駆動軸挿入孔は、互いに平行をなす一対の連結平面部（７２ｃ）と前記一対の連結平面部の間に位置する一対の連結曲面部（７２ｄ）とを有する内周面を備えた二面幅形状をなし前記二面幅部が挿入される二面幅孔部（７２ａ）を有し、対向する前記平面部と前記連結平面部との間、及び、対向する前記曲面部と前記連結曲面部との間に、前記駆動軸挿入孔内での前記駆動側挿入部の径方向の移動を許容する駆動側許容隙間（Ｇ１）を備え、前記連結曲面部には、弾性を有し前記曲面部を径方向内側に押圧する駆動側弾性部材（７４）が設けられ、前記連結平面部の周方向の両端部は、前記駆動軸挿入孔の内部に露出している。 The motor of the present disclosure includes a rotating rotating shaft (24), a reduction mechanism (51) including a worm shaft (52) arranged so as to be coaxial with the rotating shaft, and the rotating shaft and the worm shaft. The rotating shaft has a drive-side insertion portion (31) at the tip of the rotating shaft, and the worm shaft includes a clutch (13) having a connecting member (62) that integrally rotatably connects the worm shafts. The drive has a driven side insertion portion (102) at the base end portion of the worm shaft, and the connecting member has an inner peripheral surface into which the drive side insertion portion is inserted and the drive side insertion portion engages in the rotational direction. The drive side insertion portion includes a shaft insertion hole (72) and a driven shaft insertion hole (75) having an inner peripheral surface into which the driven side insertion portion is inserted and the driven side insertion portion engages in the rotational direction. , A width across flats portion (32) having an outer peripheral surface having a pair of flat surfaces (32a) parallel to each other and a pair of curved surfaces (32b) located between the pair of flat surfaces. The drive shaft insertion hole has an inner peripheral surface having a pair of connecting flat surfaces (72c) parallel to each other and a pair of connecting curved surfaces (72d) located between the pair of connecting flat portions. It has a two-sided width shape and has a two-sided width hole portion (72a) into which the two-sided width portion is inserted. A drive-side allowable gap (G1) that allows radial movement of the drive-side insertion portion in the drive shaft insertion hole is provided between the connection curved surface portion and the connection curved surface portion, and the connecting curved surface portion is provided with elasticity. A drive-side elastic member (74) that has and presses the curved surface portion inward in the radial direction is provided, and both ends of the connecting flat portion in the circumferential direction are exposed inside the drive shaft insertion hole.

上記態様によれば、駆動側弾性部材は、回転軸の回転時に平面部と曲面部との境界部分の角部が押し付けられる可能性の高い連結平面部の周方向の両端部には設けられていない。そして、駆動側弾性部材は、回転軸の回転時に平面部と曲面部との境界部分の角部が押し付けられる可能性の低い連結曲面部に設けられている。従って、回転軸の回転時に、駆動側弾性部材に平面部と曲面部との境界部分の角部が押し付けられることが抑制されるため、駆動側弾性部材の断裂等が生じることが抑制される。その結果、駆動軸挿入孔の内周面に設けられる駆動側弾性部材の耐久性の低下を抑制できる。 According to the above aspect, the drive-side elastic member is provided at both ends in the circumferential direction of the connecting flat surface portion where the corner portion of the boundary portion between the flat surface portion and the curved surface portion is likely to be pressed when the rotation shaft rotates. Absent. The drive-side elastic member is provided on the connecting curved surface portion where the corner portion of the boundary portion between the flat surface portion and the curved surface portion is unlikely to be pressed when the rotation shaft rotates. Therefore, when the rotating shaft is rotated, it is suppressed that the corner portion of the boundary portion between the flat surface portion and the curved surface portion is pressed against the driving side elastic member, so that the driving side elastic member is suppressed from being torn or the like. As a result, it is possible to suppress a decrease in durability of the drive-side elastic member provided on the inner peripheral surface of the drive shaft insertion hole.

本開示のモータによれば、駆動軸挿入孔の内周面に設けられる駆動側弾性部材の耐久性の低下を抑制できる。 According to the motor of the present disclosure, it is possible to suppress a decrease in durability of the drive-side elastic member provided on the inner peripheral surface of the drive shaft insertion hole.

一実施形態におけるモータの断面図。Sectional drawing of the motor in one Embodiment. 一実施形態におけるモータの部分拡大断面図。A partially enlarged cross-sectional view of the motor in one embodiment. 一実施形態におけるモータの部分拡大断面図。A partially enlarged cross-sectional view of the motor in one embodiment. 一実施形態における連結部材の断面図。Sectional drawing of the connecting member in one Embodiment. 一実施形態における連結部材の断面図。Sectional drawing of the connecting member in one Embodiment. 一実施形態における連結部材の一部を示す平面図。The plan view which shows a part of the connecting member in one Embodiment. （ａ）及び（ｂ）は一実施形態におけるクラッチの断面図。(A) and (b) are sectional views of the clutch in one embodiment. （ａ）及び（ｂ）は一実施形態におけるクラッチの断面図。(A) and (b) are sectional views of the clutch in one embodiment. （ａ）及び（ｂ）は一実施形態におけるクラッチの断面図。(A) and (b) are sectional views of the clutch in one embodiment. （ａ）〜（ｄ）は一実施形態におけるモータの一部を示す断面図。(A) to (d) are cross-sectional views showing a part of the motor in one embodiment. 変更例における連結部材の断面図。FIG. 3 is a cross-sectional view of a connecting member in a modified example. 変更例における連結部材の一部を示す平面図。The plan view which shows a part of the connecting member in the modified example.

以下、モータの一実施形態について説明する。
図１に示すように、モータ１０は、モータ部１１、減速部１２及びクラッチ１３を備えている。 Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor 10 includes a motor unit 11, a deceleration unit 12, and a clutch 13.

［モータ部の構成］
モータ部１１の外郭であるヨーク２１は、有底筒状をなしている。ヨーク２１は、同ヨーク２１の開口部側の端部から外周側に延びる鍔状のフランジ部２１ａを有する。ヨーク２１の内周面には永久磁石２２が固定されている。また、ヨーク２１の内側には、永久磁石２２よりも内側となる位置に電機子２３が配置されている。電機子２３は、回転軸２４と、回転軸２４に一体回転可能に固定された電機子コア２５と、電機子コア２５に巻回されたコイル２６と、回転軸２４と一体回転する整流子２７とを備えている。回転軸２４は、略円柱状をなすとともに、ヨーク２１の中央部に配置されている。回転軸２４の基端部は、ヨーク２１の底部中央に設けられた軸受２８によって軸支されている。 [Composition of motor part]
The yoke 21, which is the outer shell of the motor portion 11, has a bottomed tubular shape. The yoke 21 has a flange-shaped flange portion 21a extending from the end portion of the yoke 21 on the opening side to the outer peripheral side. A permanent magnet 22 is fixed to the inner peripheral surface of the yoke 21. Further, inside the yoke 21, the armature 23 is arranged at a position inside the permanent magnet 22. The armature 23 includes a rotating shaft 24, an armature core 25 rotatably fixed to the rotating shaft 24, a coil 26 wound around the armature core 25, and a commutator 27 that rotates integrally with the rotating shaft 24. And have. The rotating shaft 24 has a substantially cylindrical shape and is arranged at the center of the yoke 21. The base end portion of the rotating shaft 24 is pivotally supported by a bearing 28 provided at the center of the bottom portion of the yoke 21.

図２及び図３に示すように、回転軸２４は、同回転軸２４の先端部に駆動側挿入部３１を有する。駆動側挿入部３１は、回転軸２４の先端部で円柱形状から平行に面取りした二面幅形状をなす二面幅部３２と、二面幅部３２の基端で二面幅部３２の短手方向の両側に突出した肩部３３とを有する。なお、肩部３３は、回転軸２４の先端部に二面幅部３２を設けたことにより形成されたものである。二面幅部３２の外周面は、回転軸２４の軸方向Ｘ１に延び互いに平行な平面状をなす一対の平面部３２ａと、一対の平面部３２ａの間に位置する一対の曲面部３２ｂとを有する。なお、「回転軸２４の軸方向Ｘ１」は、回転軸２４の中心軸線Ｌ１と平行な方向であり、以下、単に「軸方向Ｘ１」と記載する。二面幅部３２は、軸方向Ｘ１から見て、平面部３２ａと平行な方向が長手方向、平面部３２ａと直交する方向が短手方向となっている。各曲面部３２ｂは、一対の平面部３２ａの周方向の端部同士を連結している。また、各曲面部３２ｂは、軸方向Ｘ１から見て外周側に膨らむ円弧状をなしている。更に、各曲面部３２ｂは、肩部３３と同じ曲率の円弧状をなすとともに、径方向の位置が肩部３３の外周面と等しい。また、二面幅部３２は、周方向に隣り合う平面部３２ａと曲面部３２ｂとの境界部分に軸方向に延びる角部３２ｃを有する。 As shown in FIGS. 2 and 3, the rotating shaft 24 has a driving side insertion portion 31 at the tip end portion of the rotating shaft 24. The drive-side insertion portion 31 has a two-sided width portion 32 having a two-sided width shape chamfered in parallel from a cylindrical shape at the tip of the rotating shaft 24, and a short two-sided width portion 32 at the base end of the two-sided width portion 32. It has shoulders 33 protruding on both sides in the hand direction. The shoulder portion 33 is formed by providing the width across flats portion 32 at the tip end portion of the rotating shaft 24. The outer peripheral surface of the width across flats 32 includes a pair of flat surface portions 32a extending in the axial direction X1 of the rotating shaft 24 and forming a plane shape parallel to each other, and a pair of curved surface portions 32b located between the pair of flat surface portions 32a. Have. The "axial direction X1 of the rotating shaft 24" is a direction parallel to the central axis L1 of the rotating shaft 24, and is hereinafter simply referred to as "axial direction X1". When viewed from the axial direction X1, the width across flats portion 32 has a longitudinal direction in a direction parallel to the flat surface portion 32a and a lateral direction in a direction orthogonal to the flat surface portion 32a. Each curved surface portion 32b connects end portions of a pair of flat surface portions 32a in the circumferential direction. Further, each curved surface portion 32b has an arc shape that bulges toward the outer peripheral side when viewed from the axial direction X1. Further, each curved surface portion 32b has an arc shape having the same curvature as the shoulder portion 33, and its radial position is equal to the outer peripheral surface of the shoulder portion 33. Further, the width across flats portion 32 has a corner portion 32c extending in the axial direction at a boundary portion between the flat surface portion 32a and the curved surface portion 32b adjacent to each other in the circumferential direction.

図１に示すように、電機子コア２５は、回転軸２４における駆動側挿入部３１よりも基端側の部分に固定されている。整流子２７は、回転軸２４における電機子コア２５が固定された部分と駆動側挿入部３１との間に固定されている。コイル２６は、整流子２７に電気的に接続されている。 As shown in FIG. 1, the armature core 25 is fixed to a portion of the rotating shaft 24 on the base end side of the drive side insertion portion 31. The commutator 27 is fixed between the portion of the rotating shaft 24 where the armature core 25 is fixed and the drive side insertion portion 31. The coil 26 is electrically connected to the commutator 27.

ヨーク２１の開口部にはブラシホルダ３５が嵌合されている。ブラシホルダ３５は、ヨーク２１の開口部を閉塞する形状をなすホルダ本体３５ａと、軸方向Ｘ１と直交する方向においてヨーク２１のフランジ部２１ａよりも外周側に位置するコネクタ部３５ｂとを有する。ホルダ本体３５ａとコネクタ部３５ｂとは一体に形成されている。 A brush holder 35 is fitted in the opening of the yoke 21. The brush holder 35 has a holder body 35a having a shape that closes the opening of the yoke 21, and a connector portion 35b located on the outer peripheral side of the flange portion 21a of the yoke 21 in a direction orthogonal to the axial direction X1. The holder body 35a and the connector portion 35b are integrally formed.

ホルダ本体３５ａは、同ホルダ本体３５ａの中央部に、前記軸受２８と共に回転軸２４を軸支する軸受３６を保持している。軸受３６は、回転軸２４における整流子２７と駆動側挿入部３１との間の部位を回転可能に支持する。回転軸２４の先端部は、ホルダ本体３５ａを軸方向Ｘ１に貫通してヨーク２１の外部に突出している。 The holder body 35a holds a bearing 36 that pivotally supports the rotating shaft 24 together with the bearing 28 in the central portion of the holder body 35a. The bearing 36 rotatably supports a portion of the rotating shaft 24 between the commutator 27 and the drive-side insertion portion 31. The tip of the rotating shaft 24 penetrates the holder body 35a in the axial direction X1 and projects to the outside of the yoke 21.

ホルダ本体３５ａは、整流子２７の外周面に摺接する複数の給電用のブラシ３７を保持している。また、ブラシホルダ３５は、複数のターミナル３８を保持している。各ブラシ３７は、対応するターミナル３８に電気的に接続されている。各ターミナルの一端部は、コネクタ部３５ｂの内側に露出している。コネクタ部３５ｂには、外部の電源装置に接続された図示しない外部コネクタが接続される。外部コネクタを介して供給される電流は、ターミナル３８、ブラシ３７及び整流子２７を介してコイル２６に供給される。これにより、電機子２３が回転、即ち回転軸２４が回転されるようになっている。 The holder body 35a holds a plurality of power feeding brushes 37 that are in sliding contact with the outer peripheral surface of the commutator 27. Further, the brush holder 35 holds a plurality of terminals 38. Each brush 37 is electrically connected to the corresponding terminal 38. One end of each terminal is exposed inside the connector portion 35b. An external connector (not shown) connected to an external power supply device is connected to the connector portion 35b. The current supplied through the external connector is supplied to the coil 26 via the terminal 38, the brush 37 and the commutator 27. As a result, the armature 23 is rotated, that is, the rotating shaft 24 is rotated.

［減速部の構成］
減速部１２は、樹脂製のギヤハウジング４１と、同ギヤハウジング４１に収容され回転軸２４の回転を減速する減速機構５１とを有する。 [Configuration of deceleration unit]
The speed reduction unit 12 includes a resin gear housing 41 and a speed reduction mechanism 51 housed in the gear housing 41 to decelerate the rotation of the rotating shaft 24.

ギヤハウジング４１は、モータ部１１と軸方向Ｘ１に対向する部位に、ヨーク２１が固定される固定部４１ａを有する。固定部４１ａは、軸方向Ｘ１から見てフランジ部２１ａの外形と同様の外形を有する。固定部４１ａには、ヨーク２１の内側に開口する嵌合凹部４１ｂが形成されている。嵌合凹部４１ｂ内にブラシホルダ３５におけるヨーク２１から突出した部分が嵌合された状態で、固定部４１ａと同固定部４１ａに軸方向Ｘ１から当接したフランジ部２１ａとが螺子４２にて固定されることにより、ギヤハウジング４１にヨーク２１が固定されている。即ち、螺子４２にてヨーク２１とギヤハウジング４１とが固定されることにより、モータ部１１と減速部１２とが一体化されている。 The gear housing 41 has a fixing portion 41a to which the yoke 21 is fixed at a portion facing the motor portion 11 and the axial direction X1. The fixed portion 41a has an outer shape similar to the outer shape of the flange portion 21a when viewed from the axial direction X1. The fixing portion 41a is formed with a fitting recess 41b that opens inside the yoke 21. In a state where the portion of the brush holder 35 protruding from the yoke 21 is fitted in the fitting recess 41b, the fixing portion 41a and the flange portion 21a in contact with the fixing portion 41a from the axial direction X1 are fixed by the screw 42. By doing so, the yoke 21 is fixed to the gear housing 41. That is, the motor portion 11 and the deceleration portion 12 are integrated by fixing the yoke 21 and the gear housing 41 with the screw 42.

ギヤハウジング４１において嵌合凹部４１ｂの底部中央には、第１収容凹部４１ｃが軸方向Ｘ１に凹設されている。更に、ギヤハウジング４１において第１収容凹部４１ｃの底部中央には、同第１収容凹部４１ｃよりも小径の第２収容凹部４１ｄが軸方向Ｘ１に凹設されている。また、ギヤハウジング４１には、第２収容凹部４１ｄの底部中央から軸方向Ｘ１に延びるウォーム収容部４１ｅが形成されている。ウォーム収容部４１ｅには、略円柱状のウォーム軸５２が収容されている。ウォーム軸５２は、ウォーム収容部４１ｅにおける軸方向Ｘ１の両端部にそれぞれ配置された一対の軸受４３，４４によって軸支されている。ウォーム軸５２は、軸受４３，４４に軸支されることにより、回転軸２４と同軸上に配置されている。即ち、ウォーム軸５２は、回転軸２４の中心軸線Ｌ１とウォーム軸５２の中心軸線Ｌ２とが一直線上となるように配置されている。 In the gear housing 41, a first accommodating recess 41c is recessed in the axial direction X1 at the center of the bottom of the fitting recess 41b. Further, in the gear housing 41, a second accommodating recess 41d having a diameter smaller than that of the first accommodating recess 41c is recessed in the axial direction X1 at the center of the bottom of the first accommodating recess 41c. Further, the gear housing 41 is formed with a worm housing portion 41e extending in the axial direction X1 from the center of the bottom of the second housing recess 41d. The worm accommodating portion 41e accommodates a substantially columnar worm shaft 52. The worm shaft 52 is pivotally supported by a pair of bearings 43 and 44 arranged at both ends of the axial direction X1 in the worm housing portion 41e. The worm shaft 52 is coaxially arranged with the rotating shaft 24 by being pivotally supported by the bearings 43 and 44. That is, the worm shaft 52 is arranged so that the central axis L1 of the rotating shaft 24 and the central axis L2 of the worm shaft 52 are aligned with each other.

また、ギヤハウジング４１には、軸方向Ｘ１と直交する方向にウォーム収容部４１ｅと隣り合うギヤ収容部４１ｆが形成されている。ギヤ収容部４１ｆは、ウォーム収容部４１ｅと連通している。ギヤ収容部４１ｆには、ウォーム軸５２と噛合する円板状のウォームホイール５３が回転可能に収容されている。ウォームホイール５３は、ウォーム軸５２と共に減速機構５１を構成している。ウォームホイール５３の径方向の中央部には、ウォームホイール５３の軸方向に延びる出力軸５４が同ウォームホイール５３と一体回転可能に設けられている。 Further, the gear housing 41 is formed with a gear accommodating portion 41f adjacent to the worm accommodating portion 41e in a direction orthogonal to the axial direction X1. The gear accommodating portion 41f communicates with the worm accommodating portion 41e. A disc-shaped worm wheel 53 that meshes with the worm shaft 52 is rotatably housed in the gear accommodating portion 41f. The worm wheel 53 and the worm shaft 52 form a reduction mechanism 51. At the center of the worm wheel 53 in the radial direction, an output shaft 54 extending in the axial direction of the worm wheel 53 is provided so as to be integrally rotatable with the worm wheel 53.

［クラッチの構成］
図１及び図２に示すように、第１収容凹部４１ｃ及び第２収容凹部４１ｄの内部には、回転軸２４とウォーム軸５２とを連結するクラッチ１３が収容されている。クラッチ１３は、クラッチハウジング６１、連結部材６２、サポート部材６３、転動体６４及び従動側回転体６５を備えている。 [Clutch configuration]
As shown in FIGS. 1 and 2, a clutch 13 for connecting the rotating shaft 24 and the worm shaft 52 is housed inside the first housing recess 41c and the second housing recess 41d. The clutch 13 includes a clutch housing 61, a connecting member 62, a support member 63, a rolling element 64, and a driven side rotating body 65.

クラッチハウジング６１は円筒状をなしている。クラッチハウジング６１は、同クラッチハウジング６１の軸方向の一端部に、径方向外側に延びる鍔状の固定フランジ部６１ａを有する。クラッチハウジング６１は、第１収容凹部４１ｃの底面に固定フランジ部６１ａが当接した状態で第２収容凹部４１ｄ内に挿入されている。クラッチハウジング６１は、固定フランジ部６１ａが第１収容凹部４１ｃの底面に固定されることにより、ギヤハウジング４１に対して軸方向Ｘ１に移動不能且つ回転軸２４の中心軸線Ｌ１回りの周方向に回転不能に固定されている。なお、「回転軸２４の中心軸線Ｌ１回りの周方向」は、以下単に「周方向」と記載するものとする。ギヤハウジング４１に固定されたクラッチハウジング６１は、回転軸２４及びウォーム軸５２と同軸上に配置されている。 The clutch housing 61 has a cylindrical shape. The clutch housing 61 has a flange-shaped fixed flange portion 61a extending radially outward at one end in the axial direction of the clutch housing 61. The clutch housing 61 is inserted into the second accommodating recess 41d with the fixed flange portion 61a in contact with the bottom surface of the first accommodating recess 41c. Since the fixed flange portion 61a is fixed to the bottom surface of the first accommodating recess 41c, the clutch housing 61 cannot move in the axial direction X1 with respect to the gear housing 41 and rotates in the circumferential direction around the central axis L1 of the rotating shaft 24. It is fixed to the impossible. The "circumferential direction around the central axis L1 of the rotating shaft 24" is hereinafter simply referred to as "circumferential direction". The clutch housing 61 fixed to the gear housing 41 is arranged coaxially with the rotating shaft 24 and the worm shaft 52.

図２及び図４に示すように、連結部材６２は、軸方向Ｘ１に延びる軸連結部７１を有する。軸連結部７１は、クラッチハウジング６１の内径より小さい外径を有する略円筒状をなしている。軸連結部７１の径方向の中央部には、軸方向Ｘ１に延びる駆動軸挿入孔７２が形成されている。駆動軸挿入孔７２は、軸連結部７１におけるモータ部１１側の軸方向の一端から同軸連結部７１の軸方向の略中央部にわたって形成されている。駆動軸挿入孔７２は、軸方向Ｘ１から見た形状が二面幅形状をなす二面幅孔部７２ａと、駆動軸挿入孔７２におけるモータ部１１側の開口部に位置する拡径部７２ｂとを有する。二面幅孔部７２ａと拡径部７２ｂとは軸方向Ｘ１に隣接している。 As shown in FIGS. 2 and 4, the connecting member 62 has an axial connecting portion 71 extending in the axial direction X1. The shaft connecting portion 71 has a substantially cylindrical shape having an outer diameter smaller than the inner diameter of the clutch housing 61. A drive shaft insertion hole 72 extending in the axial direction X1 is formed at the center of the shaft connecting portion 71 in the radial direction. The drive shaft insertion hole 72 is formed from one end of the shaft connecting portion 71 on the motor portion 11 side in the axial direction to a substantially central portion in the axial direction of the coaxial connecting portion 71. The drive shaft insertion hole 72 includes a two-sided width hole portion 72a having a two-sided width shape when viewed from the axial direction X1, and an enlarged diameter portion 72b located at the opening on the motor portion 11 side of the drive shaft insertion hole 72. Has. The width across flats 72a and the enlarged diameter 72b are adjacent to each other in the axial direction X1.

図４〜図６に示すように、二面幅孔部７２ａの内周面は、径方向に離間して互いに平行をなす一対の連結平面部７２ｃと、一対の連結平面部７２ｃの間に位置する一対の連結曲面部７２ｄとを有する。各連結平面部７２ｃは、軸方向Ｘ１に延びる平面状をなしている。各連結曲面部７２ｄは、一対の連結平面部７２ｃの周方向の端部同士を連結している。また、各連結曲面部７２ｄは、軸方向Ｘ１から見て径方向外側に向かって凹む円弧状をなしている。二面幅孔部７２ａは、軸方向Ｘ１から見て、連結平面部７２ｃと平行な方向が長手方向、連結平面部７２ｃと直交する方向が短手方向となっている。そして、二面幅孔部７２ａの短手方向の長さは、駆動側挿入部３１の二面幅部３２の短手方向の長さよりも長い。更に、二面幅孔部７２ａの長手方向の長さは、二面幅部３２の長手方向の長さよりも長い。 As shown in FIGS. 4 to 6, the inner peripheral surfaces of the width across flat holes 72a are located between a pair of connecting flat surfaces 72c separated in the radial direction and parallel to each other and a pair of connecting flat surfaces 72c. It has a pair of connecting curved surface portions 72d. Each connecting flat surface portion 72c has a flat shape extending in the axial direction X1. Each connecting curved surface portion 72d connects the end portions of the pair of connecting flat surface portions 72c in the circumferential direction. Further, each connecting curved surface portion 72d has an arc shape that is recessed outward in the radial direction when viewed from the axial direction X1. The widthwise hole portion 72a has a longitudinal direction in a direction parallel to the connecting flat surface portion 72c and a lateral direction in a direction orthogonal to the connecting flat surface portion 72c when viewed from the axial direction X1. The length of the two-sided width hole portion 72a in the lateral direction is longer than the length of the two-sided width portion 32 of the drive-side insertion portion 31 in the lateral direction. Further, the length of the width across flats hole 72a in the longitudinal direction is longer than the length of the width across flats 32 in the longitudinal direction.

図２〜図６に示すように、拡径部７２ｂは、二面幅孔部７２ａよりもモータ部１１側に位置するとともに、二面幅孔部７２ａにおけるモータ部１１側の開口部と軸方向Ｘ１に隣り合っている。拡径部７２ｂは、駆動軸挿入孔７２におけるモータ部１１側の開口部を拡径する形状をなしている。拡径部７２ｂの径方向の大きさは、駆動側挿入部３１における肩部３３での外径よりも大きい。この拡径部７２ｂが設けられることにより、駆動軸挿入孔７２におけるモータ部１１側の端部には、開口段部７２ｅが形成されている。開口段部７２ｅは、モータ部１１側を向き軸方向Ｘ１と直交する平面状をなす境界面７２ｆを有する。境界面７２ｆは、駆動軸挿入孔７２において拡径部７２ｂと二面幅孔部７２ａとの境界に位置する。二面幅孔部７２ａにおけるモータ部１１側の開口は、境界面７２ｆに形成されている。なお、境界面７２ｆは、必ずしも軸方向Ｘ１と直交する平面でなくてもよく、軸方向Ｘ１に対して傾斜した面や、凹凸を有する面であってもよい。 As shown in FIGS. 2 to 6, the enlarged diameter portion 72b is located closer to the motor portion 11 than the width across flat hole 72a, and is in the axial direction with the opening on the side of the motor portion 11 in the width across flats 72a. Adjacent to X1. The diameter-expanded portion 72b has a shape that expands the diameter of the opening on the motor portion 11 side in the drive shaft insertion hole 72. The radial size of the enlarged diameter portion 72b is larger than the outer diameter of the shoulder portion 33 of the driving side insertion portion 31. By providing the enlarged diameter portion 72b, an opening step portion 72e is formed at the end portion of the drive shaft insertion hole 72 on the motor portion 11 side. The opening step portion 72e has a boundary surface 72f having a plane shape facing the motor portion 11 side and orthogonal to the axial direction X1. The boundary surface 72f is located at the boundary between the enlarged diameter portion 72b and the width across flat hole portion 72a in the drive shaft insertion hole 72. The opening on the motor portion 11 side in the width across flat hole portion 72a is formed in the boundary surface 72f. The boundary surface 72f does not necessarily have to be a plane orthogonal to the axial direction X1, and may be a surface inclined with respect to the axial direction X1 or a surface having irregularities.

駆動軸挿入孔７２に駆動側挿入部３１が挿入されることにより、回転軸２４と連結部材６２とが一体回転可能に連結されている。詳しくは、駆動側挿入部３１は、先端の二面幅部３２が二面幅孔部７２ａに挿入されるとともに、肩部３３が拡径部７２ｂに挿入されている。二面幅部３２は、同二面幅部３２の短手方向の両側で平面部３２ａと連結平面部７２ｃとが径方向に対向するように、且つ同二面幅部３２の長手方向の両側で曲面部３２ｂと連結曲面部７２ｄとが径方向に対向するように二面幅孔部７２ａに挿入されている。 By inserting the drive-side insertion portion 31 into the drive shaft insertion hole 72, the rotary shaft 24 and the connecting member 62 are integrally rotatably connected. Specifically, in the drive side insertion portion 31, the front end width portion 32 is inserted into the width across flats hole 72a, and the shoulder portion 33 is inserted into the diameter expansion portion 72b. In the two-sided width portion 32, the flat surface portion 32a and the connecting flat surface portion 72c face each other in the radial direction on both sides of the two-sided width portion 32 in the lateral direction, and both sides of the two-sided width portion 32 in the longitudinal direction. The curved surface portion 32b and the connecting curved surface portion 72d are inserted into the width across flat hole portion 72a so as to face each other in the radial direction.

駆動軸挿入孔７２において、二面幅孔部７２ａの短手方向の長さは、二面幅部３２の短手方向の長さよりも長く、且つ、二面幅孔部７２ａの長手方向の長さは、二面幅部３２の長手方向の長さよりも長い。即ち、駆動軸挿入孔７２は、二面幅部３２に対して二面幅孔部７２ａの寸法が相対的に所定値だけ大きくなるように形成されている。そのため、駆動軸挿入孔７２の内周面と駆動側挿入部３１の外周面との間には、駆動軸挿入孔７２内での駆動側挿入部３１の径方向の移動を許容する駆動側許容隙間Ｇ１が形成される。駆動側許容隙間Ｇ１は、駆動軸挿入孔７２の長手方向の端部及び駆動軸挿入孔７２の短手方向の端部に形成される。詳しくは、駆動側許容隙間Ｇ１は、互いに対向する平面部３２ａと連結平面部７２ｃとの間、及び互いに対向する曲面部３２ｂと連結曲面部７２ｄとの間に形成される。そして、駆動側許容隙間Ｇ１は、駆動軸挿入孔７２内での連結平面部７２ｃと平行な方向の駆動側挿入部３１の移動、及び、駆動軸挿入孔７２内での連結平面部７２ｃと直交する方向の駆動側挿入部３１の移動を許容する。 In the drive shaft insertion hole 72, the length of the width across flats hole 72a in the lateral direction is longer than the length of the width across flats 32 in the lateral direction, and the length of the width across flats 72a in the longitudinal direction. The width is longer than the length of the width across flats 32 in the longitudinal direction. That is, the drive shaft insertion hole 72 is formed so that the dimension of the width across flats 72a is relatively larger by a predetermined value with respect to the width across flats 32. Therefore, between the inner peripheral surface of the drive shaft insertion hole 72 and the outer peripheral surface of the drive side insertion portion 31, the drive side is allowed to move in the drive shaft insertion hole 72 in the radial direction. A gap G1 is formed. The drive-side allowable gap G1 is formed at the longitudinal end of the drive shaft insertion hole 72 and the lateral end of the drive shaft insertion hole 72. Specifically, the drive-side allowable gap G1 is formed between the flat surface portion 32a facing each other and the connecting flat surface portion 72c, and between the curved surface portion 32b facing each other and the connecting curved surface portion 72d. The drive-side allowable gap G1 is orthogonal to the movement of the drive-side insertion portion 31 in the direction parallel to the connection plane portion 72c in the drive shaft insertion hole 72 and the connection plane portion 72c in the drive shaft insertion hole 72. Allows the drive side insertion unit 31 to move in the direction of movement.

二面幅部３２の長手方向の長さは、二面幅孔部７２ａの短手方向の長さ、即ち一対の連結平面部７２ｃ間の距離よりも短いため、二面幅部３２は、二面幅孔部７２ａと回転方向に係合可能である。即ち、二面幅部３２の平面部３２ａが二面幅孔部７２ａの連結平面部７２ｃに当接することにより、駆動側挿入部３１は、駆動軸挿入孔７２の内周面と回転方向に係合可能である。そして、駆動側挿入部３１が駆動軸挿入孔７２の内周面に回転方向に係合することにより、駆動側挿入部３１と連結部材６２とは一体回転可能に連結される。このように、駆動側挿入部３１は、連結部材６２と一体回転可能に駆動軸挿入孔７２に遊嵌されている。 Since the length of the two-sided width portion 32 in the longitudinal direction is shorter than the length of the two-sided width hole portion 72a in the lateral direction, that is, the distance between the pair of connecting flat portions 72c, the two-sided width portion 32 has two sides. It can be engaged with the surface width hole portion 72a in the rotational direction. That is, when the flat surface portion 32a of the two-sided width portion 32 abuts on the connecting flat surface portion 72c of the two-sided width hole portion 72a, the drive side insertion portion 31 engages with the inner peripheral surface of the drive shaft insertion hole 72 in the rotational direction. It is possible. Then, by engaging the drive-side insertion portion 31 with the inner peripheral surface of the drive shaft insertion hole 72 in the rotational direction, the drive-side insertion portion 31 and the connecting member 62 are integrally rotatably connected. In this way, the drive-side insertion portion 31 is loosely fitted in the drive shaft insertion hole 72 so as to be integrally rotatable with the connecting member 62.

軸方向Ｘ１における連結部材６２の端部であって駆動軸挿入孔７２の外側開口部側の端部には、弾性を有する環状弾性部材７３が設けられている。環状弾性部材７３は、拡径部７２ｂの内周面に設けられている。詳しくは、環状弾性部材７３は、拡径部７２ｂにおいて、二面幅孔部７２ａの内周面よりも外周側に設けられている。そして、環状弾性部材７３は、軸方向Ｘ１から見て、二面幅孔部７２ａにおける拡径部７２ｂ側の開口部の外周を囲む環状をなしている。環状弾性部材７３は、同環状弾性部材７３の内周面から径方向内側に突出した一対の押圧部７３ａを有する。押圧部７３ａは、境界面７２ｆ上で二面幅孔部７２ａの短手方向の両側となる場所に１つずつ形成されている。各押圧部７３ａにおける径方向内側の端面は、径方向内側に膨らむ円弧状をなしている。また、各押圧部７３ａは、軸方向Ｘ１から見て連結平面部７２ｃよりも外周側に位置する。なお、駆動側挿入部３１が駆動軸挿入孔７２に挿入されていない状態においては、一方の押圧部７３ａと他方の押圧部７３ａとの間の距離は、駆動側挿入部３１の肩部３３における外径よりも短い。そして、各押圧部７３ａは、拡径部７２ｂ内に配置された駆動側挿入部３１の肩部３３を径方向内側に押圧する。なお、図６は、駆動軸挿入孔７２に駆動側挿入部３１が挿入されていない状態の連結部材６２を図示するとともに、駆動側挿入部３１を二点鎖線の仮想線で図示している。 An elastic annular elastic member 73 is provided at the end of the connecting member 62 in the axial direction X1 and on the outer opening side of the drive shaft insertion hole 72. The annular elastic member 73 is provided on the inner peripheral surface of the enlarged diameter portion 72b. Specifically, the annular elastic member 73 is provided in the enlarged diameter portion 72b on the outer peripheral side of the inner peripheral surface of the width across flat hole portion 72a. The annular elastic member 73 has an annular shape that surrounds the outer periphery of the opening on the enlarged diameter portion 72b side in the width across flat hole portion 72a when viewed from the axial direction X1. The annular elastic member 73 has a pair of pressing portions 73a protruding inward in the radial direction from the inner peripheral surface of the annular elastic member 73. One pressing portion 73a is formed on each of the two side width hole portions 72a on the boundary surface 72f on both sides in the lateral direction. The radial inner end face of each pressing portion 73a has an arc shape that bulges inward in the radial direction. Further, each pressing portion 73a is located on the outer peripheral side of the connecting flat portion 72c when viewed from the axial direction X1. In the state where the drive side insertion portion 31 is not inserted into the drive shaft insertion hole 72, the distance between one pressing portion 73a and the other pressing portion 73a is the shoulder portion 33 of the drive side insertion portion 31. Shorter than the outer diameter. Then, each pressing portion 73a presses the shoulder portion 33 of the driving side insertion portion 31 arranged in the diameter-expanded portion 72b inward in the radial direction. Note that FIG. 6 illustrates the connecting member 62 in which the drive-side insertion portion 31 is not inserted into the drive shaft insertion hole 72, and the drive-side insertion portion 31 is illustrated by a virtual line of a two-dot chain line.

駆動軸挿入孔７２の内周面には、弾性を有し駆動側挿入部３１を径方向内側に押圧する駆動側弾性部材７４が設けられている。駆動側弾性部材７４は、二面幅孔部７２ａの長手方向の両端に位置する連結曲面部７２ｄの各々に設けられている。即ち、駆動側弾性部材７４は、駆動軸挿入孔７２の内周面のうち、二面幅孔部７２ａの長手方向の端部における内周面に設けられている。各駆動側弾性部材７４は、各々が設けられた連結曲面部７２ｄの周方向の中央部に位置する。そして、駆動側弾性部材７４は、各連結曲面部７２ｄの周方向の両端部には設けられていない。駆動軸挿入孔７２の内周面において、駆動側弾性部材７４及び環状弾性部材７３が形成されていない部分は、駆動軸挿入孔７２の内部に露出している。そのため、各連結曲面部７２ｄの周方向の両端部は、駆動軸挿入孔７２の内部に露出している。即ち、連結曲面部７２ｄにおける駆動側弾性部材７４の周方向の両側となる部分であって、連結曲面部７２ｄの周方向の端から同連結曲面部７２ｄの周方向の中央側に周方向の幅を持つ範囲が、駆動軸挿入孔７２の内部に露出している。更に、駆動軸挿入孔７２の内周面において、拡径部７２ｂの内面における環状弾性部材７３に覆われていない部分は、及び一対の連結平面部７２ｃは、駆動軸挿入孔７２の内部に露出している。 A drive-side elastic member 74 having elasticity and pressing the drive-side insertion portion 31 inward in the radial direction is provided on the inner peripheral surface of the drive shaft insertion hole 72. The drive-side elastic member 74 is provided on each of the connecting curved surface portions 72d located at both ends in the longitudinal direction of the width across flat hole portion 72a. That is, the drive-side elastic member 74 is provided on the inner peripheral surface of the inner peripheral surface of the drive shaft insertion hole 72 at the end portion in the longitudinal direction of the width across flat hole portion 72a. Each drive-side elastic member 74 is located at the center of the connecting curved surface portion 72d provided with each in the circumferential direction. The drive-side elastic member 74 is not provided at both ends of each connecting curved surface portion 72d in the circumferential direction. On the inner peripheral surface of the drive shaft insertion hole 72, a portion where the drive side elastic member 74 and the annular elastic member 73 are not formed is exposed inside the drive shaft insertion hole 72. Therefore, both ends of each connecting curved surface portion 72d in the circumferential direction are exposed inside the drive shaft insertion hole 72. That is, the portions of the connecting curved surface portion 72d that are both sides of the drive-side elastic member 74 in the circumferential direction, and the width in the circumferential direction from the circumferential end of the connecting curved surface portion 72d to the center side in the circumferential direction of the connecting curved surface portion 72d. Is exposed inside the drive shaft insertion hole 72. Further, on the inner peripheral surface of the drive shaft insertion hole 72, the portion of the inner surface of the enlarged diameter portion 72b that is not covered by the annular elastic member 73, and the pair of connecting flat surfaces 72c are exposed inside the drive shaft insertion hole 72. doing.

各連結曲面部７２ｄにおいて、駆動側弾性部材７４は、各々が設けられた連結曲面部７２ｄよりも径方向内側に突出している。また、駆動側弾性部材７４は、軸方向Ｘ１に沿って連続して延びる突条をなしている。更に、駆動側弾性部材７４は、軸方向Ｘ１には、連結曲面部７２ｄにおける二面幅部３２と径方向に重なる範囲の軸方向Ｘ１の一端から他端まで連続して延びている。本実施形態では、連結曲面部７２ｄは、同連結曲面部７２ｄの軸方向Ｘ１の一端から他端までが二面幅部３２と径方向に重なるため、各駆動側弾性部材７４は、連結曲面部７２ｄの軸方向Ｘ１の一端から他端にわたって連続的に延びている。各駆動側弾性部材７４における拡径部７２ｂ側の軸方向Ｘ１の端部は、環状弾性部材７３に連続している。 In each connecting curved surface portion 72d, the drive-side elastic member 74 projects radially inward from the connecting curved surface portion 72d provided with each. Further, the drive-side elastic member 74 has a ridge extending continuously along the axial direction X1. Further, the drive-side elastic member 74 continuously extends in the axial direction X1 from one end to the other end in the axial direction X1 in a range that overlaps the width across flats 32 in the connecting curved surface portion 72d in the radial direction. In the present embodiment, since the connecting curved surface portion 72d overlaps the width across flats 32 in the radial direction from one end to the other end of the axial direction X1 of the connecting curved surface portion 72d, each drive-side elastic member 74 has a connecting curved surface portion. It extends continuously from one end to the other end of the axial direction X1 of 72d. The end portion of each drive-side elastic member 74 on the enlarged diameter portion 72b side in the axial direction X1 is continuous with the annular elastic member 73.

各駆動側弾性部材７４の径方向内側の先端面は、軸方向Ｘ１から見て径方向内側に膨らむ円弧状をなしている。そして、駆動側挿入部３１が駆動軸挿入孔７２に挿入されていない状態においては、一方の駆動側弾性部材７４と他方の駆動側弾性部材７４との間の距離は、二面幅部３２の長手方向の長さよりも短い。そのため、駆動側挿入部３１が駆動軸挿入孔７２に挿入された状態では、各駆動側弾性部材７４は、二面幅部３２の曲面部３２ｂを径方向内側に押圧する。このように、駆動側弾性部材７４が駆動側挿入部３１を径方向内側に押圧するため、モータ１０の組立て時において、回転軸２４に連結部材６２を装着した際、駆動側弾性部材７４により連結部材６２が回転軸２４から脱落しないように弾性保持される。そのため、モータ１０の組立て時における作業性が向上する。 The radial inner tip surface of each drive-side elastic member 74 has an arc shape that bulges inward in the radial direction when viewed from the axial direction X1. When the drive-side insertion portion 31 is not inserted into the drive shaft insertion hole 72, the distance between one drive-side elastic member 74 and the other drive-side elastic member 74 is the width across flats 32. Shorter than the longitudinal length. Therefore, when the drive-side insertion portion 31 is inserted into the drive shaft insertion hole 72, each drive-side elastic member 74 presses the curved surface portion 32b of the width across flats portion 32 inward in the radial direction. In this way, since the drive-side elastic member 74 presses the drive-side insertion portion 31 inward in the radial direction, when the connecting member 62 is attached to the rotating shaft 24 at the time of assembling the motor 10, it is connected by the driving-side elastic member 74. The member 62 is elastically held so as not to fall off from the rotating shaft 24. Therefore, workability at the time of assembling the motor 10 is improved.

図２〜図５に示すように、軸連結部７１の径方向の中央部には、同軸連結部７１の軸方向に延びる従動軸挿入孔７５が形成されている。従動軸挿入孔７５は、軸連結部７１における減速部１２側の一端から同軸連結部７１の軸方向の略中央部にわたって形成されている。従動軸挿入孔７５は、駆動軸挿入孔７２と連通している。 As shown in FIGS. 2 to 5, a driven shaft insertion hole 75 extending in the axial direction of the coaxial connecting portion 71 is formed at the central portion in the radial direction of the shaft connecting portion 71. The driven shaft insertion hole 75 is formed from one end of the shaft connecting portion 71 on the deceleration portion 12 side to a substantially central portion in the axial direction of the coaxial connecting portion 71. The driven shaft insertion hole 75 communicates with the drive shaft insertion hole 72.

図７（ｂ）に示すように、従動軸挿入孔７５は、軸方向Ｘ１から見た形状が二面幅形状をなしている。従動軸挿入孔７５の内周面は、径方向に離間して互いに平行をなす一対の駆動側伝達面７５ａと、一対の駆動側伝達面７５ａの間に位置しこれら駆動側伝達面７５ａの両端同士を連結する２つの連結面７５ｂとを有する。従動軸挿入孔７５は、軸方向Ｘ１から見て、駆動側伝達面７５ａと平行な方向が長手方向、駆動側伝達面７５ａと直交する方向が短手方向となっている。即ち、従動軸挿入孔７５は、軸方向Ｘ１から見た形状が短手方向と長手方向とを有する形状をなしている。また、従動軸挿入孔７５の中心軸線は、駆動軸挿入孔７２の中心軸線と一致している。更に、従動軸挿入孔７５は、駆動軸挿入孔７２に対して連結部材６２の回転方向に９０°ずれている。即ち、従動軸挿入孔７５の長手方向は、二面幅孔部７２ａの長手方向に対して連結部材６２の回転方向に９０°ずれている。なお、連結部材６２の回転方向は、回転軸２４の回転方向と同じである。従って、連結部材６２を軸方向Ｘ１から見ると、駆動軸挿入孔７２における二面幅孔部７２ａの短手方向の中央を通り長手方向に延びる駆動軸挿入孔７２の中心線Ｍ１は、従動軸挿入孔７５の短手方向の中央を通り長手方向に延びる従動軸挿入孔７５の中心線Ｍ２と直交する。 As shown in FIG. 7B, the driven shaft insertion hole 75 has a width across flats when viewed from the axial direction X1. The inner peripheral surfaces of the driven shaft insertion holes 75 are located between a pair of drive-side transmission surfaces 75a that are radially separated and parallel to each other and a pair of drive-side transmission surfaces 75a, and both ends of these drive-side transmission surfaces 75a. It has two connecting surfaces 75b that connect them to each other. The driven shaft insertion hole 75 has a longitudinal direction in a direction parallel to the driving side transmission surface 75a and a lateral direction in a direction orthogonal to the driving side transmission surface 75a when viewed from the axial direction X1. That is, the driven shaft insertion hole 75 has a shape in which the shape seen from the axial direction X1 has a lateral direction and a longitudinal direction. Further, the central axis of the driven shaft insertion hole 75 coincides with the central axis of the drive shaft insertion hole 72. Further, the driven shaft insertion hole 75 is deviated by 90 ° in the rotational direction of the connecting member 62 with respect to the drive shaft insertion hole 72. That is, the longitudinal direction of the driven shaft insertion hole 75 is deviated by 90 ° from the longitudinal direction of the width across flat hole portion 72a in the rotational direction of the connecting member 62. The rotation direction of the connecting member 62 is the same as the rotation direction of the rotation shaft 24. Therefore, when the connecting member 62 is viewed from the axial direction X1, the center line M1 of the drive shaft insertion hole 72 extending in the longitudinal direction through the center of the width across flats 72a in the drive shaft insertion hole 72 in the lateral direction is the driven shaft. It passes through the center of the insertion hole 75 in the lateral direction and is orthogonal to the center line M2 of the driven shaft insertion hole 75 extending in the longitudinal direction.

従動軸挿入孔７５の長手方向の端部における内周面、即ち連結面７５ｂには、弾性を有する材料よりなる第１従動側弾性部材７６が設けられている。各第１従動側弾性部材７６は、連結面７５ｂにおける従動軸挿入孔７５の短手方向の中央部で軸方向Ｘ１に沿って延びている。そして、各第１従動側弾性部材７６は、連結面７５ｂよりも従動軸挿入孔７５の内側に突出している。 A first driven-side elastic member 76 made of an elastic material is provided on the inner peripheral surface, that is, the connecting surface 75b, at the end of the driven shaft insertion hole 75 in the longitudinal direction. Each first driven side elastic member 76 extends along the axial direction X1 at the central portion of the driven shaft insertion hole 75 in the connecting surface 75b in the lateral direction. Each of the first driven side elastic members 76 projects from the connecting surface 75b to the inside of the driven shaft insertion hole 75.

各駆動側伝達面７５ａには、弾性を有する材料よりなる第２従動側弾性部材７７が設けられている。第２従動側弾性部材７７は、各駆動側伝達面７５ａにおける従動軸挿入孔７５の長手方向の中央部で軸方向Ｘ１に沿って延びている。各第２従動側弾性部材７７は、駆動側伝達面７５ａよりも従動軸挿入孔７５の内側に突出している。 A second driven-side elastic member 77 made of an elastic material is provided on each drive-side transmission surface 75a. The second driven side elastic member 77 extends along the axial direction X1 at the central portion in the longitudinal direction of the driven shaft insertion hole 75 in each drive side transmission surface 75a. Each second driven side elastic member 77 projects from the driving side transmission surface 75a to the inside of the driven shaft insertion hole 75.

図３及び図５に示すように、従動軸挿入孔７５における駆動軸挿入孔７２側の軸方向Ｘ１の端部には、弾性を有する材料よりなる軸方向緩衝部材７８が設けられている。軸方向緩衝部材７８は、従動軸挿入孔７５における駆動軸挿入孔７２側の軸方向Ｘ１の端部において駆動軸挿入孔７２よりも外周側となる位置に設けられている。そして、軸方向緩衝部材７８は、従動軸挿入孔７５の内側に向かって軸方向Ｘ１に突出している。 As shown in FIGS. 3 and 5, an axial cushioning member 78 made of an elastic material is provided at the end of the driven shaft insertion hole 75 on the drive shaft insertion hole 72 side in the axial direction X1. The axial buffer member 78 is provided at the end of the driven shaft insertion hole 75 on the drive shaft insertion hole 72 side in the axial direction X1 so as to be on the outer peripheral side of the drive shaft insertion hole 72. Then, the axial buffer member 78 projects in the axial direction X1 toward the inside of the driven shaft insertion hole 75.

軸連結部７１における従動軸挿入孔７５側の軸方向Ｘ１の端部には、径方向外側に延びる略円環状の鍔部７９が一体に形成されている。鍔部７９の外径は、クラッチハウジング６１の内径よりも若干大きい。 A substantially annular flange portion 79 extending radially outward is integrally formed at the end of the shaft connecting portion 71 on the driven shaft insertion hole 75 side in the axial direction X1. The outer diameter of the flange portion 79 is slightly larger than the inner diameter of the clutch housing 61.

鍔部７９には、２つの転動体解除部８１が一体に形成されている。２つの転動体解除部８１は、従動軸挿入孔７５の長手方向の両側に形成されている。各転動体解除部８１は、鍔部７９から軸方向Ｘ１に沿って駆動軸挿入孔７２と反対側に延びている。２つの転動体解除部８１は、周方向に１８０°間隔となる位置に形成されている。 Two rolling element releasing portions 81 are integrally formed on the collar portion 79. The two rolling element releasing portions 81 are formed on both sides of the driven shaft insertion hole 75 in the longitudinal direction. Each rolling element release portion 81 extends from the flange portion 79 along the axial direction X1 to the side opposite to the drive shaft insertion hole 72. The two rolling element releasing portions 81 are formed at positions at intervals of 180 ° in the circumferential direction.

図３、図５及び図７（ａ）に示すように、各転動体解除部８１は、径方向内側の側面、周方向の両側面、径方向外側の側面における転動体解除部８１の先端側の部分、及び先端面が、弾性を有する材料よりなる衝撃吸収部材８２にて被覆されている。衝撃吸収部材８２を含む転動体解除部８１の形状は、径方向外側の側面が円弧状をなすとともに、径方向内側の側面が平面状をなす径方向視略長方形の板状をなしている。 As shown in FIGS. 3, 5 and 7 (a), each rolling element releasing portion 81 is provided on the radial inner side surface, the circumferential side surface, and the tip end side of the rolling element releasing portion 81 on the radial outer side surface. The portion and the tip surface thereof are covered with a shock absorbing member 82 made of an elastic material. The shape of the rolling element releasing portion 81 including the shock absorbing member 82 is a substantially rectangular plate shape in the radial direction in which the outer side surface in the radial direction is arcuate and the inner side surface in the radial direction is flat.

この衝撃吸収部材８２、環状弾性部材７３、駆動側弾性部材７４、第１及び第２従動側弾性部材７６，７７、及び軸方向緩衝部材７８は、連結部材６２における衝撃吸収部材８２、環状弾性部材７３、駆動側弾性部材７４、第１及び第２従動側弾性部材７６，７７、及び軸方向緩衝部材７８以外の樹脂材料よりなる部位と一体に成形されている。また、本実施形態では、環状弾性部材７３、駆動側弾性部材７４、第１及び第２従動側弾性部材７６，７７、軸方向緩衝部材７８、及び衝撃吸収部材８２は、同じ材料よりなる。環状弾性部材７３、駆動側弾性部材７４、第１及び第２従動側弾性部材７６，７７、軸方向緩衝部材７８、及び衝撃吸収部材８２は、例えばゴムを含むエラストマよりなる。更に、本実施形態では、環状弾性部材７３、駆動側弾性部材７４、第１及び第２従動側弾性部材７６，７７、軸方向緩衝部材７８、及び衝撃吸収部材８２は、全て連続して一体で形成されている。 The shock absorbing member 82, the annular elastic member 73, the driving side elastic member 74, the first and second driven side elastic members 76, 77, and the axial cushioning member 78 are the shock absorbing member 82 and the annular elastic member in the connecting member 62. It is integrally molded with a portion made of a resin material other than 73, the driving side elastic member 74, the first and second driven side elastic members 76, 77, and the axial cushioning member 78. Further, in the present embodiment, the annular elastic member 73, the drive side elastic member 74, the first and second driven side elastic members 76 and 77, the axial cushioning member 78, and the shock absorbing member 82 are made of the same material. The annular elastic member 73, the drive-side elastic member 74, the first and second driven-side elastic members 76, 77, the axial cushioning member 78, and the shock absorbing member 82 are made of, for example, an elastomer containing rubber. Further, in the present embodiment, the annular elastic member 73, the drive side elastic member 74, the first and second driven side elastic members 76, 77, the axial cushioning member 78, and the shock absorbing member 82 are all continuously integrated. It is formed.

連結部材６２は、２つの転動体解除部８１の先端部がクラッチハウジング６１の内側に挿入された状態でクラッチハウジング６１に対して配置される。そして、軸連結部７１及び鍔部７９は、クラッチハウジング６１の外部に配置される。詳しくは、図１及び図３に示すように、軸連結部７１及び鍔部７９は、クラッチハウジング６１とブラシホルダ３５との間に配置される。クラッチハウジング６１の内側に配置された転動体解除部８１の先端部は、クラッチハウジング６１の内周面と径方向に対向する。 The connecting member 62 is arranged with respect to the clutch housing 61 in a state where the tip portions of the two rolling element releasing portions 81 are inserted inside the clutch housing 61. The shaft connecting portion 71 and the flange portion 79 are arranged outside the clutch housing 61. Specifically, as shown in FIGS. 1 and 3, the shaft connecting portion 71 and the flange portion 79 are arranged between the clutch housing 61 and the brush holder 35. The tip of the rolling element releasing portion 81 arranged inside the clutch housing 61 faces the inner peripheral surface of the clutch housing 61 in the radial direction.

図２及び図７（ａ）に示すように、サポート部材６３は、樹脂材料にて形成されている。サポート部材６３は、クラッチハウジング６１の固定フランジ部６１ａと連結部材６２の鍔部７９との間に配置されるリング部９１を有する。リング部９１の外径は、固定フランジ部６１ａの外径より小さい。また、リング部９１の内径は、クラッチハウジング６１の内径より大きい。 As shown in FIGS. 2 and 7A, the support member 63 is made of a resin material. The support member 63 has a ring portion 91 arranged between the fixed flange portion 61a of the clutch housing 61 and the flange portion 79 of the connecting member 62. The outer diameter of the ring portion 91 is smaller than the outer diameter of the fixed flange portion 61a. Further, the inner diameter of the ring portion 91 is larger than the inner diameter of the clutch housing 61.

リング部９１における周方向に離間した２箇所には、それぞれ一対のローラサポート９２が同リング部９１と一体に形成されている。本実施形態では、リング部９１における周方向に１８０°離間した２箇所にそれぞれ一対のローラサポート９２が設けられている。対をなすローラサポート９２は、リング部９１の内周縁から軸方向Ｘ１に延びるとともに、周方向に互いに離間している。２対のローラサポート９２の先端部は、周方向に沿って円弧状に延びる補強部９３によって連結されている。また、各ローラサポート９２の先端部には、対をなすローラサポート９２間に突出した保持爪９４が形成されている。 A pair of roller supports 92 are integrally formed with the ring portion 91 at two locations apart from each other in the circumferential direction of the ring portion 91. In the present embodiment, a pair of roller supports 92 are provided at two locations on the ring portion 91 that are separated by 180 ° in the circumferential direction. The paired roller supports 92 extend from the inner peripheral edge of the ring portion 91 in the axial direction X1 and are separated from each other in the circumferential direction. The tips of the two pairs of roller supports 92 are connected by a reinforcing portion 93 extending in an arc shape along the circumferential direction. Further, at the tip of each roller support 92, a holding claw 94 protruding between the pair of roller supports 92 is formed.

対をなすローラサポート９２において互いに対向する周方向の側面には、それぞれ外周側保持部９５及び内周側保持部９６が設けられている。外周側保持部９５は、対をなすローラサポート９２の互いに対向する側面の径方向外側の端部に沿って形成されている。内周側保持部９６は、互いに対向する側面の径方向内側の端部に沿って形成されている。外周側保持部９５及び内周側保持部９６は、対をなすローラサポート９２間に突出している。また、外周側保持部９５及び内周側保持部９６は、軸方向Ｘ１と直交する断面の形状が、対をなすローラサポート９２の中間部に向かうにつれて径方向の幅が狭くなる三角形状をなしている。なお、各ローラサポート９２は、各々の基端に対して各々の先端が周方向にずれるように弾性変形可能である。 The outer peripheral side holding portion 95 and the inner peripheral side holding portion 96 are provided on the side surfaces of the pair of roller supports 92 facing each other in the circumferential direction, respectively. The outer peripheral side holding portion 95 is formed along the radial outer end portions of the side surfaces of the pair of roller supports 92 facing each other. The inner peripheral side holding portion 96 is formed along the radial inner end portion of the side surfaces facing each other. The outer peripheral side holding portion 95 and the inner peripheral side holding portion 96 project between the pair of roller supports 92. Further, the outer peripheral side holding portion 95 and the inner peripheral side holding portion 96 have a triangular shape in which the width in the radial direction becomes narrower toward the intermediate portion of the paired roller supports 92 in the shape of the cross section orthogonal to the axial direction X1. ing. Each roller support 92 can be elastically deformed so that its tip is displaced in the circumferential direction with respect to each base end.

２対のローラサポート９２には、それぞれ転動体６４が挿入されている。各転動体６４は、円柱状をなしている。２つの転動体６４は、対をなすローラサポート９２間にそれぞれ配置されている。各転動体６４の外周面には、対をなすローラサポート９２の外周側保持部９５がサポート部材６３の外周側から当接するとともに、内周側保持部９６がサポート部材６３の内周側から当接している。即ち、各転動体６４は、対をなすローラサポート９２によって挟持されている。各転動体６４は、ローラサポート９２によって、サポート部材６３に対する径方向の移動及び周方向の移動が規制されている。更に、各転動体６４は、対をなすローラサポート９２によって、転動体６４の中心軸線を回転中心として回転可能に保持されている。また、２つの転動体６４は、対をなすローラサポート９２にてそれぞれ保持されることにより、互いの中心軸線が略平行をなすように、且つ周方向に略等角度間隔に配置される。また、各転動体６４は、保持爪９４によってサポート部材６３からの脱落が防止されている。 A rolling element 64 is inserted into each of the two pairs of roller supports 92. Each rolling element 64 has a columnar shape. The two rolling elements 64 are respectively arranged between the pair of roller supports 92. The outer peripheral side holding portion 95 of the paired roller support 92 abuts on the outer peripheral surface of each rolling element 64 from the outer peripheral side of the support member 63, and the inner peripheral side holding portion 96 abuts from the inner peripheral side of the support member 63. I'm in contact. That is, each rolling element 64 is sandwiched by a pair of roller supports 92. Each rolling element 64 is restricted from moving in the radial direction and moving in the circumferential direction with respect to the support member 63 by the roller support 92. Further, each rolling element 64 is rotatably held around the central axis of the rolling element 64 by a pair of roller supports 92. Further, the two rolling elements 64 are respectively held by the pair of roller supports 92 so that their central axes are substantially parallel to each other and are arranged at substantially equal angular intervals in the circumferential direction. Further, each rolling element 64 is prevented from falling off from the support member 63 by the holding claw 94.

図２、図３及び図７（ａ）に示すように、サポート部材６３は、転動体６４を保持したローラサポート９２がクラッチハウジング６１の内側に挿入された状態でクラッチハウジング６１に対して配置される。そして、リング部９１は、モータ部１１側から固定フランジ部６１ａに当接する。リング部９１の内側には、連結部材６２の２つの転動体解除部８１が挿入されるとともに、２つの転動体解除部８１は、２対のローラサポート９２の間にそれぞれ配置される。このサポート部材６３と連結部材６２とは、周方向に相対回転可能である。図７（ａ）及び図８（ａ）に示すように、サポート部材６３に対して連結部材６２が回転すると、連結部材６２の回転方向から各転動体解除部８１がその回転方向の前方側に位置するローラサポート９２に当接可能である。また、クラッチハウジング６１の内側に配置された転動体６４は、同転動体６４の外周面が、クラッチハウジング６１の内周面に接触可能である。 As shown in FIGS. 2, 3 and 7 (a), the support member 63 is arranged with respect to the clutch housing 61 in a state where the roller support 92 holding the rolling element 64 is inserted inside the clutch housing 61. To. Then, the ring portion 91 comes into contact with the fixed flange portion 61a from the motor portion 11 side. Inside the ring portion 91, two rolling element releasing portions 81 of the connecting member 62 are inserted, and the two rolling element releasing portions 81 are arranged between the two pairs of roller supports 92, respectively. The support member 63 and the connecting member 62 can rotate relative to each other in the circumferential direction. As shown in FIGS. 7 (a) and 8 (a), when the connecting member 62 rotates with respect to the support member 63, each rolling element releasing portion 81 moves to the front side in the rotation direction from the rotation direction of the connecting member 62. It can come into contact with the located roller support 92. Further, in the rolling element 64 arranged inside the clutch housing 61, the outer peripheral surface of the rolling element 64 can come into contact with the inner peripheral surface of the clutch housing 61.

図２及び図３に示すように、従動側回転体６５は、ウォーム軸５２の基端部に形成されている。従動側回転体６５は、軸方向に並ぶ従動側制御部１０１及び従動側挿入部１０２を備えている。 As shown in FIGS. 2 and 3, the driven side rotating body 65 is formed at the base end portion of the worm shaft 52. The driven side rotating body 65 includes a driven side control unit 101 and a driven side insertion unit 102 arranged in the axial direction.

従動側制御部１０１は、ウォーム軸５２の基端部でウォーム軸５２の軸方向に延びる柱状をなしている。従動側制御部１０１は、同従動側制御部１０１の中心軸線がウォーム軸５２の中心軸線Ｌ２と一致している。即ち、従動側制御部１０１は、ウォーム軸５２と同軸上に形成されている。従動側制御部１０１の外径は、ウォーム軸５２の最大外径以下の値に設定されている。本実施形態では、従動側制御部１０１の外径は、ウォーム軸５２において軸受４３にて軸支される部分の外径と等しい。 The driven side control unit 101 has a columnar shape extending in the axial direction of the worm shaft 52 at the base end portion of the worm shaft 52. In the driven side control unit 101, the central axis of the driven side control unit 101 coincides with the central axis L2 of the worm shaft 52. That is, the driven side control unit 101 is formed coaxially with the worm shaft 52. The outer diameter of the driven side control unit 101 is set to a value equal to or less than the maximum outer diameter of the worm shaft 52. In the present embodiment, the outer diameter of the driven side control unit 101 is equal to the outer diameter of the portion of the worm shaft 52 that is pivotally supported by the bearing 43.

図２及び図７（ａ）に示すように、従動側制御部１０１の外周面には、一対の制御面１０３が形成されている。２つの制御面１０３は、従動側制御部１０１の外周面において周方向に１８０°間隔となる２箇所、即ち周方向に等角度間隔となる２箇所に形成されている。各制御面１０３は、ウォーム軸５２の軸方向と平行な平面状をなしている。更に、一対の制御面１０３は、互いに平行をなしている。各制御面１０３におけるウォーム軸５２の軸方向の長さは、転動体６４の軸方向の長さよりも長い。 As shown in FIGS. 2 and 7A, a pair of control surfaces 103 are formed on the outer peripheral surfaces of the driven side control unit 101. The two control surfaces 103 are formed on the outer peripheral surface of the driven side control unit 101 at two locations at 180 ° intervals in the circumferential direction, that is, at two locations at equal angular intervals in the circumferential direction. Each control surface 103 has a planar shape parallel to the axial direction of the worm shaft 52. Further, the pair of control surfaces 103 are parallel to each other. The axial length of the worm shaft 52 on each control surface 103 is longer than the axial length of the rolling element 64.

従動側挿入部１０２は、従動側制御部１０１の軸方向Ｘ１の両端のうちウォーム軸５２の軸方向の中央部から遠い方の端部に一体に形成されている。即ち、従動側挿入部１０２は、従動側制御部１０１よりもウォーム軸５２の先端から離れた位置に形成されている。また、従動側挿入部１０２と従動側制御部１０１とは軸方向Ｘ１に連続して形成されている。従動側挿入部１０２は、ウォーム軸５２の軸方向に延びる柱状をなしている。従動側挿入部１０２の中心軸線は、ウォーム軸５２の中心軸線Ｌ２と一致している。即ち、従動側挿入部１０２は、ウォーム軸５２と同軸上に形成されている。従動側挿入部１０２の軸方向の長さは、連結部材６２に設けられた従動軸挿入孔７５の軸方向Ｘ１の長さよりも若干長い。従動側挿入部１０２の外径は、ウォーム軸５２の最大外径以下の値に設定されている。本実施形態では、従動側挿入部１０２の外径は、従動側制御部１０１の外径と等しい。 The driven side insertion portion 102 is integrally formed at both ends of the driven side control unit 101 in the axial direction X1 farther from the central portion in the axial direction of the worm shaft 52. That is, the driven side insertion unit 102 is formed at a position farther from the tip of the worm shaft 52 than the driven side control unit 101. Further, the driven side insertion unit 102 and the driven side control unit 101 are continuously formed in the axial direction X1. The driven side insertion portion 102 has a columnar shape extending in the axial direction of the worm shaft 52. The central axis of the driven side insertion portion 102 coincides with the central axis L2 of the worm shaft 52. That is, the driven side insertion portion 102 is formed coaxially with the worm shaft 52. The axial length of the driven side insertion portion 102 is slightly longer than the length of the driven shaft insertion hole 75 provided in the connecting member 62 in the axial direction X1. The outer diameter of the driven side insertion portion 102 is set to a value equal to or less than the maximum outer diameter of the worm shaft 52. In the present embodiment, the outer diameter of the driven side insertion unit 102 is equal to the outer diameter of the driven side control unit 101.

図７（ｂ）に示すように、従動側挿入部１０２は、軸方向Ｘ１と直交する断面形状が略楕円形状をなすとともに、その断面形状は軸方向Ｘ１に一定である。図７（ａ）及び図７（ｂ）に示すように、従動側挿入部１０２を軸方向Ｘ１から見ると、同従動側挿入部１０２の長手方向は、制御面１０３と平行な方向であるとともに、同従動側挿入部１０２の短手方向は、制御面１０３と直交する方向である。また、軸方向Ｘ１から見て、従動側挿入部１０２の長手方向の長さは、従動軸挿入孔７５の長手方向の長さよりも短い。更に、軸方向Ｘ１から見て、従動側挿入部１０２の短手方向の長さは、従動軸挿入孔７５の短手方向の長さより短い。また、従動側挿入部１０２の軸方向Ｘ１の長さは、従動軸挿入孔７５の内周面に設けられた駆動側伝達面７５ａの軸方向Ｘ１の長さよりも若干長い。 As shown in FIG. 7B, the driven side insertion portion 102 has a substantially elliptical cross-sectional shape orthogonal to the axial direction X1, and the cross-sectional shape is constant in the axial direction X1. As shown in FIGS. 7A and 7B, when the driven side insertion portion 102 is viewed from the axial direction X1, the longitudinal direction of the driven side insertion portion 102 is parallel to the control surface 103. The lateral direction of the driven side insertion portion 102 is a direction orthogonal to the control surface 103. Further, when viewed from the axial direction X1, the length of the driven side insertion portion 102 in the longitudinal direction is shorter than the length of the driven shaft insertion hole 75 in the longitudinal direction. Further, when viewed from the axial direction X1, the length of the driven side insertion portion 102 in the lateral direction is shorter than the length of the driven shaft insertion hole 75 in the lateral direction. Further, the length of the driven side insertion portion 102 in the axial direction X1 is slightly longer than the length of the driven side transmission surface 75a provided on the inner peripheral surface of the driven shaft insertion hole 75 in the axial direction X1.

図７（ｂ）に示すように、従動側挿入部１０２の外周面には、一対の第１従動側伝達面１０４及び一対の第２従動側伝達面１０５が形成されている。対をなす２つの第１従動側伝達面１０４のうち一方の第１従動側伝達面１０４は、他方の第１従動側伝達面１０４に対して１８０°反対側に形成されている。２つの第１従動側伝達面１０４は、それぞれ軸方向Ｘ１と平行な平面状をなすとともに、互いに平行をなしている。更に、２つの第１従動側伝達面１０４間の間隔は、従動軸挿入孔７５の内周面に設けられた一対の駆動側伝達面７５ａ間の間隔と等しい。また、第２従動側伝達面１０５は、２つの第１従動側伝達面１０４の間にそれぞれ形成されている。そして、一方の第２従動側伝達面１０５は、他方の第２従動側伝達面１０５に対して１８０°反対側に形成されている。２つの第２従動側伝達面１０５は、それぞれ軸方向Ｘ１と平行な平面状をなすとともに、互いに平行をなしている。更に、２つの第２従動側伝達面１０５間の間隔は、一対の駆動側伝達面７５ａ間の間隔と等しい。各第１従動側伝達面１０４及び各第２従動側伝達面１０５は、軸方向Ｘ１には、従動側挿入部１０２の軸方向Ｘ１の一端から他端にわたって形成されている。 As shown in FIG. 7B, a pair of first driven side transmission surfaces 104 and a pair of second driven side transmission surfaces 105 are formed on the outer peripheral surface of the driven side insertion portion 102. The first driven side transmitting surface 104 of the two paired first driven side transmitting surfaces 104 is formed 180 ° opposite to the other first driven side transmitting surface 104. The two first driven side transmission surfaces 104 have a planar shape parallel to the axial direction X1 and are parallel to each other. Further, the distance between the two first driven side transmission surfaces 104 is equal to the distance between the pair of drive side transmission surfaces 75a provided on the inner peripheral surface of the driven shaft insertion hole 75. Further, the second driven side transmission surface 105 is formed between the two first driven side transmission surfaces 104, respectively. One of the second driven side transmission surfaces 105 is formed 180 ° opposite to the other second driven side transmission surface 105. The two second driven side transmission surfaces 105 each have a planar shape parallel to the axial direction X1 and are parallel to each other. Further, the distance between the two second driven side transmission surfaces 105 is equal to the distance between the pair of drive side transmission surfaces 75a. Each first driven side transmission surface 104 and each second driven side transmission surface 105 are formed in the axial direction X1 from one end to the other end of the axial direction X1 of the driven side insertion portion 102.

図２及び図７（ａ）に示すように、従動側回転体６５は、連結部材６２と反対側からクラッチハウジング６１及びサポート部材６３の内側に挿入されている。そして、従動側挿入部１０２は、連結部材６２の従動軸挿入孔７５に挿入される。また、従動側制御部１０１は、サポート部材６３にて保持された２つの転動体６４の間に配置される。なお、従動側回転体６５は、クラッチハウジング６１、連結部材６２及びサポート部材６３と同軸上に配置される。 As shown in FIGS. 2 and 7A, the driven side rotating body 65 is inserted inside the clutch housing 61 and the support member 63 from the side opposite to the connecting member 62. Then, the driven side insertion portion 102 is inserted into the driven shaft insertion hole 75 of the connecting member 62. Further, the driven side control unit 101 is arranged between two rolling elements 64 held by the support member 63. The driven side rotating body 65 is arranged coaxially with the clutch housing 61, the connecting member 62, and the support member 63.

図３及び図７（ｂ）に示すように、従動側挿入部１０２は、連結部材６２と一体回転可能に従動軸挿入孔７５に遊嵌されている。そして、従動側挿入部１０２は、軸方向Ｘ１から軸方向緩衝部材７８に当接している。また、径方向に対向する従動側挿入部１０２の外周面と従動軸挿入孔７５内周面との間には、第１従動側弾性部材７６及び第２従動側弾性部材７７が介在されている。一対の第１従動側弾性部材７６は、従動軸挿入孔７５の内部で同従動軸挿入孔７５の長手方向の両側から従動側挿入部１０２に接触している。第２従動側弾性部材７７は、従動軸挿入孔７５の内部で同従動軸挿入孔７５の短手方向の両側から従動側挿入部１０２に接触している。詳しくは、第２従動側弾性部材７７は、従動側挿入部１０２の外周面における、従動側挿入部１０２の長手方向に隣り合う第１従動側伝達面１０４と第２従動側伝達面１０５との間の部分に接触している。 As shown in FIGS. 3 and 7 (b), the driven side insertion portion 102 is loosely fitted in the driven shaft insertion hole 75 which can rotate integrally with the connecting member 62. Then, the driven side insertion portion 102 is in contact with the axial buffer member 78 from the axial direction X1. Further, a first driven side elastic member 76 and a second driven side elastic member 77 are interposed between the outer peripheral surface of the driven side insertion portion 102 facing in the radial direction and the inner peripheral surface of the driven shaft insertion hole 75. .. The pair of first driven side elastic members 76 are in contact with the driven side insertion portion 102 from both sides in the longitudinal direction of the driven shaft insertion hole 75 inside the driven shaft insertion hole 75. The second driven side elastic member 77 is in contact with the driven side insertion portion 102 from both sides of the driven shaft insertion hole 75 in the lateral direction inside the driven shaft insertion hole 75. Specifically, the second driven side elastic member 77 is formed by the first driven side transmitting surface 104 and the second driven side transmitting surface 105 adjacent to each other in the longitudinal direction of the driven side inserting portion 102 on the outer peripheral surface of the driven side inserting portion 102. It is in contact with the part in between.

従動側回転体６５に対して連結部材６２が同連結部材６２の中心軸線周りに回転すると、連結部材６２の回転方向に応じて、第１従動側伝達面１０４及び第２従動側伝達面１０５の何れか一方の従動側伝達面に、対向する駆動側伝達面７５ａが回転方向から当接する。そして、従動側挿入部１０２は、第１従動側伝達面１０４及び第２従動側伝達面１０５の何れか一方の従動側伝達面と、従動軸挿入孔７５の短手方向の両端に設けられた駆動側伝達面７５ａとが当接して回転方向に係合することで、連結部材６２と一体回転可能となる。即ち、連結部材６２と従動側回転体６５とが回転方向に係合されて連結部材６２の回転駆動力が従動側回転体６５に伝達されるようになる。そして、連結部材６２の駆動軸挿入孔７２には、回転軸２４の駆動側挿入部３１が挿入されているため、従動側挿入部１０２を有するウォーム軸５２と回転軸２４とが連結部材６２を介して一体回転可能に連結されることになる。 When the connecting member 62 rotates about the central axis of the connecting member 62 with respect to the driven side rotating body 65, the first driven side transmitting surface 104 and the second driven side transmitting surface 105 depend on the rotation direction of the connecting member 62. The opposite drive-side transmission surface 75a abuts on either one of the driven-side transmission surfaces from the direction of rotation. The driven side insertion portion 102 is provided at either one of the first driven side transmitting surface 104 and the second driven side transmitting surface 105, and at both ends of the driven shaft insertion hole 75 in the lateral direction. When the drive-side transmission surface 75a abuts and engages in the rotation direction, it can rotate integrally with the connecting member 62. That is, the connecting member 62 and the driven side rotating body 65 are engaged in the rotational direction, and the rotational driving force of the connecting member 62 is transmitted to the driven side rotating body 65. Since the drive side insertion portion 31 of the rotary shaft 24 is inserted into the drive shaft insertion hole 72 of the connecting member 62, the worm shaft 52 having the driven side insertion portion 102 and the rotary shaft 24 connect the connecting member 62. It will be connected so that it can rotate integrally via.

図７（ｂ）に示すように、軸方向Ｘ１から見て、従動軸挿入孔７５の長手方向の長さは、従動側挿入部１０２の長手方向の長さよりも長い。更に、軸方向Ｘ１から見て、従動軸挿入孔７５の短手方向の長さは、従動側挿入部１０２の短手方向の長さよりも長い。そのため、従動軸挿入孔７５の内周面と従動側挿入部１０２との間には、従動軸挿入孔７５内での従動側挿入部１０２の径方向の移動を許容する従動側許容隙間Ｇ２が形成される。即ち、駆動側伝達面７５ａと従動側挿入部１０２の外周面との間、並びに、連結面７５ｂと従動側挿入部１０２の外周面との間に、当該従動側許容隙間Ｇ２が形成される。なお、従動側挿入部１０２は、従動軸挿入孔７５内で同従動軸挿入孔７５の長手方向に移動する場合には、第１従動側弾性部材７６を弾性変形させながら移動する。また、従動側挿入部１０２は、従動軸挿入孔７５内で同従動軸挿入孔７５の短手方向に移動する場合には、第２従動側弾性部材７７を弾性変形させながら移動する。 As shown in FIG. 7B, the length of the driven shaft insertion hole 75 in the longitudinal direction is longer than the length of the driven side insertion portion 102 in the longitudinal direction when viewed from the axial direction X1. Further, when viewed from the axial direction X1, the length of the driven shaft insertion hole 75 in the lateral direction is longer than the length of the driven side insertion portion 102 in the lateral direction. Therefore, between the inner peripheral surface of the driven shaft insertion hole 75 and the driven side insertion portion 102, there is a driven side allowable gap G2 that allows the driven side insertion portion 102 to move in the driven shaft insertion hole 75 in the radial direction. It is formed. That is, the driven side allowable gap G2 is formed between the drive side transmission surface 75a and the outer peripheral surface of the driven side insertion portion 102, and between the connecting surface 75b and the outer peripheral surface of the driven side insertion portion 102. When the driven side insertion portion 102 moves in the driven shaft insertion hole 75 in the longitudinal direction of the driven shaft insertion hole 75, the driven side insertion portion 102 moves while elastically deforming the first driven side elastic member 76. Further, when the driven side insertion portion 102 moves in the driven shaft insertion hole 75 in the lateral direction of the driven shaft insertion hole 75, the driven side insertion portion 102 moves while elastically deforming the second driven side elastic member 77.

次に、上記のように構成されたモータ１０の動作をクラッチ１３の動作を中心に説明する。
図１に示すように、モータ部１１の停止時、即ち回転軸２４の非回転時には、出力軸５４に接続された負荷から同出力軸５４に荷重がかかると、その荷重によりウォーム軸５２が回転しようとする。そのため、従動側回転体６５が回転しようとする。すると、図７（ａ）に示すように、従動側回転体６５の各制御面１０３が、各制御面１０３とクラッチハウジング６１の内周面との間に配置された転動体６４を外周側に押圧する。制御面１０３に押された転動体６４は、当該転動体６４を保持するローラサポート９２を弾性変形させながら外周側保持部９５を周方向の両側に押し開いて外周側に移動してクラッチハウジング６１の内周面に当接する。そして、各制御面１０３は、各制御面１０３とクラッチハウジング６１の内周面との間に配置された転動体６４をクラッチハウジング６１の内周面と共に挟持する。なお、図８（ａ）では、モータ部１１側から軸方向Ｘ１に見て、従動側回転体６５が反時計方向に回転しようとした場合のクラッチ１３を図示している。そして、クラッチハウジング６１は周方向に回転不能であることから、クラッチハウジング６１及び転動体６４によって従動側回転体６５のそれ以上の回転が阻止される。その結果、ウォーム軸５２の回転が阻止されるため、ウォーム軸５２側から回転軸２４が回転されることが抑制される。なお、制御面１０３における転動体６４に当接する部位は、制御面１０３の周方向の中央よりも制御面１０３の周方向の端部側の部位である。また、図７（ａ）には、モータ部１１側から軸方向Ｘ１に見て従動側回転体６５が反時計方向に回転しようとした場合を図示しているが、従動側回転体６５が時計方向に回転しようとした場合であっても、同様にその回転が阻止される。 Next, the operation of the motor 10 configured as described above will be described focusing on the operation of the clutch 13.
As shown in FIG. 1, when the motor unit 11 is stopped, that is, when the rotating shaft 24 is not rotating, when a load is applied to the output shaft 54 from the load connected to the output shaft 54, the worm shaft 52 rotates due to the load. try to. Therefore, the driven side rotating body 65 tries to rotate. Then, as shown in FIG. 7A, each control surface 103 of the driven side rotating body 65 has a rolling element 64 arranged between each control surface 103 and the inner peripheral surface of the clutch housing 61 on the outer peripheral side. Press. The rolling element 64 pushed by the control surface 103 pushes open the outer peripheral side holding portion 95 to both sides in the circumferential direction while elastically deforming the roller support 92 holding the rolling element 64, and moves to the outer peripheral side to move the clutch housing 61. Abuts on the inner peripheral surface of. Then, each control surface 103 sandwiches the rolling element 64 arranged between each control surface 103 and the inner peripheral surface of the clutch housing 61 together with the inner peripheral surface of the clutch housing 61. Note that FIG. 8A illustrates the clutch 13 when the driven side rotating body 65 tries to rotate counterclockwise when viewed from the motor unit 11 side in the axial direction X1. Since the clutch housing 61 cannot rotate in the circumferential direction, the clutch housing 61 and the rolling element 64 prevent further rotation of the driven side rotating body 65. As a result, the rotation of the worm shaft 52 is blocked, so that the rotation of the rotating shaft 24 from the worm shaft 52 side is suppressed. The portion of the control surface 103 that comes into contact with the rolling element 64 is a portion of the control surface 103 that is closer to the end of the control surface 103 in the circumferential direction than the center of the control surface 103 in the circumferential direction. Further, FIG. 7A shows a case where the driven side rotating body 65 tries to rotate counterclockwise when viewed from the motor unit 11 side in the axial direction X1, but the driven side rotating body 65 is a clock. Even if it tries to rotate in a direction, the rotation is similarly blocked.

一方、モータ部１１の駆動時、即ち回転軸２４の回転時には、図８（ａ）及び図８（ｂ）に示すように、回転軸２４と一体に連結部材６２が回転軸２４の中心軸線Ｌ１を回転中心に回転駆動される。なお、図８（ａ）、図８（ｂ）、図９（ａ）及び図９（ｂ）では、モータ部１１側から軸方向Ｘ１に見て、回転軸２４及び連結部材６２が反時計方向に回転駆動された場合のクラッチ１３を図示している。そして、停止しているサポート部材６３に対して連結部材６２が回転されて、連結部材６２の各転動体解除部８１が、各転動体解除部８１の回転方向の前方側に位置するローラサポート９２に当接して該ローラサポート９２を回転方向に押圧する。すると、ローラサポート９２にて保持された転動体は、クラッチハウジング６１と制御面１０３とによる挟持が解除される。これにより、従動側回転体６５のロックが解除される。なお、このとき、連結部材６２の駆動側伝達面７５ａは、従動側回転体６５の第１従動側伝達面１０４に当接しておらず、従動側回転体６５は停止した状態に維持されている。また、制御面１０３とクラッチハウジング６１の内周面とによる挟持が解除された転動体６４は、対をなすローラサポート９２が２つの外周側保持部９５を互いに近づけるように原形に復帰することで内周側に押し戻される。そして、各転動体６４は、対をなすローラサポート９２の外周側保持部９５と内周側保持部９６とによってサポート部材６３に対する径方向及び周方向の移動が規制された状態となる。 On the other hand, when the motor unit 11 is driven, that is, when the rotating shaft 24 is rotating, as shown in FIGS. 8A and 8B, the connecting member 62 is integrated with the rotating shaft 24 and the central axis L1 of the rotating shaft 24 is connected. Is driven to rotate around the center of rotation. In FIGS. 8 (a), 8 (b), 9 (a) and 9 (b), the rotating shaft 24 and the connecting member 62 are counterclockwise when viewed in the axial direction X1 from the motor unit 11 side. The clutch 13 when it is rotationally driven is shown in the figure. Then, the connecting member 62 is rotated with respect to the stopped support member 63, and each rolling element releasing portion 81 of the connecting member 62 is located on the front side in the rotational direction of each rolling element releasing portion 81. The roller support 92 is pressed in the rotational direction in contact with the roller support 92. Then, the rolling element held by the roller support 92 is released from being sandwiched between the clutch housing 61 and the control surface 103. As a result, the driven side rotating body 65 is unlocked. At this time, the drive-side transmission surface 75a of the connecting member 62 does not abut on the first driven-side transmission surface 104 of the driven-side rotating body 65, and the driven-side rotating body 65 is maintained in a stopped state. .. Further, the rolling element 64, which has been released from being sandwiched between the control surface 103 and the inner peripheral surface of the clutch housing 61, returns to its original shape so that the paired roller supports 92 bring the two outer peripheral side holding portions 95 closer to each other. It is pushed back to the inner circumference side. Then, each rolling element 64 is in a state in which movement in the radial direction and the circumferential direction with respect to the support member 63 is restricted by the outer peripheral side holding portion 95 and the inner peripheral side holding portion 96 of the paired roller support 92.

そして、図９（ｂ）に示すように、回転軸２４によって連結部材６２が更に回転駆動されると、駆動側伝達面７５ａが第１従動側伝達面１０４に回転方向から当接する。即ち、連結部材６２の駆動側伝達面７５ａと従動側挿入部１０２の第１従動側伝達面１０４とが回転方向に係合する。これにより、駆動側伝達面７５ａ及び第１従動側伝達面１０４を介して連結部材６２から従動側挿入部１０２に回転駆動力を伝達可能となるため、連結部材６２と共に従動側回転体６５が同従動側回転体６５の中心軸線を回転中心として回転される。このとき、図９（ａ）に示すように、転動体解除部８１に押圧されてサポート部材６３が連結部材６２と一体的に回転するため、転動体６４もサポート部材６３に案内されながら従動側回転体６５と共に回転する。詳しくは、転動体６４は、それぞれローラサポート９２にて保持された状態で制御面１０３の周方向の中央部に配置される。そして、転動体６４は、クラッチハウジング６１の内周面と制御面１０３とによって挟持されることなく、サポート部材６３に保持されながら従動側回転体６５と共に同従動側回転体６５の中心軸線を回転中心として回転する。 Then, as shown in FIG. 9B, when the connecting member 62 is further rotationally driven by the rotating shaft 24, the driving side transmission surface 75a comes into contact with the first driven side transmitting surface 104 from the rotational direction. That is, the drive-side transmission surface 75a of the connecting member 62 and the first driven-side transmission surface 104 of the driven-side insertion portion 102 are engaged in the rotational direction. As a result, the rotational driving force can be transmitted from the connecting member 62 to the driven side insertion portion 102 via the driving side transmitting surface 75a and the first driven side transmitting surface 104, so that the driven side rotating body 65 is the same as the connecting member 62. It is rotated around the central axis of the driven side rotating body 65 as the center of rotation. At this time, as shown in FIG. 9A, since the support member 63 is pressed by the rolling element releasing portion 81 and rotates integrally with the connecting member 62, the rolling element 64 is also guided by the support member 63 on the driven side. It rotates with the rotating body 65. Specifically, the rolling elements 64 are arranged at the central portion of the control surface 103 in the circumferential direction while being held by the roller supports 92. Then, the rolling element 64 rotates the central axis of the driven side rotating body 65 together with the driven side rotating body 65 while being held by the support member 63 without being sandwiched by the inner peripheral surface of the clutch housing 61 and the control surface 103. Rotate as the center.

ここで、図１０（ａ）に示すように、モータ１０においては、組付け誤差等により回転軸２４とウォーム軸５２とが軸ずれする場合がある。図１０（ａ）には、回転軸２４とウォーム軸５２とが軸ずれした場合の一例として、回転軸２４の中心軸線Ｌ１とウォーム軸５２の中心軸線Ｌ２とが平行な状態で径方向にずれた状態を図示している。なお、図１０（ａ）では、理解を促すために、回転軸２４とウォーム軸５２との軸ずれを誇張して図示している。このような場合、図６、図９（ｂ）及び図１０（ａ）に示すように、駆動軸挿入孔７２内で駆動側挿入部３１が駆動側許容隙間Ｇ１の範囲内で駆動軸挿入孔７２に対して径方向に相対的に移動するとともに、従動軸挿入孔７５内で従動側挿入部１０２が従動側許容隙間Ｇ２の範囲内で従動軸挿入孔７５に対して径方向に相対的に移動する。これにより、回転軸２４とウォーム軸５２との軸ずれが連結部材６２において許容される。従って、回転軸２４の先端部及びウォーム軸５２の基端部に径方向に大きな荷重がかかることが抑制される。このとき、駆動側弾性部材７４は、弾性変形することにより、駆動軸挿入孔７２に対する駆動側挿入部３１の径方向の相対移動を許容する。なお、環状弾性部材７３も、駆動側挿入部３１の駆動軸挿入孔７２に対する径方向の相対的移動に応じて弾性変形可能である。なお、連結部材６２は、回転軸２４とウォーム軸５２との軸ずれを許容することにより、中心軸線Ｌ１及び中心軸線Ｌ２に対して連結部材６２の中心軸線が傾斜した状態になる。 Here, as shown in FIG. 10A, in the motor 10, the rotating shaft 24 and the worm shaft 52 may be misaligned due to an assembly error or the like. In FIG. 10A, as an example of the case where the rotating shaft 24 and the worm shaft 52 are displaced in the radial direction, the central axis L1 of the rotating shaft 24 and the central axis L2 of the worm shaft 52 are displaced in the radial direction. The state is illustrated. In FIG. 10A, the misalignment between the rotating shaft 24 and the worm shaft 52 is exaggerated in order to promote understanding. In such a case, as shown in FIGS. 6, 9 (b) and 10 (a), the drive side insertion portion 31 in the drive shaft insertion hole 72 is within the range of the drive side allowable gap G1. While moving relative to 72 in the radial direction, the driven side insertion portion 102 in the driven shaft insertion hole 75 is relative to the driven shaft insertion hole 75 in the radial direction within the range of the driven side allowable gap G2. Moving. As a result, a misalignment between the rotating shaft 24 and the worm shaft 52 is allowed in the connecting member 62. Therefore, it is possible to prevent a large radial load from being applied to the tip end of the rotating shaft 24 and the base end of the worm shaft 52. At this time, the drive-side elastic member 74 is elastically deformed to allow the drive-side insertion portion 31 to move relative to the drive shaft insertion hole 72 in the radial direction. The annular elastic member 73 can also be elastically deformed according to the relative movement of the drive-side insertion portion 31 with respect to the drive shaft insertion hole 72 in the radial direction. By allowing the rotating shaft 24 and the worm shaft 52 to deviate from each other, the connecting member 62 is in a state where the central axis of the connecting member 62 is inclined with respect to the central axis L1 and the central axis L2.

図１０（ｂ）は、図１０（ａ）に示す状態から回転軸２４が９０°回転した状態を示している。また、図１０（ｃ）は、図１０（ｂ）に示す状態から回転軸２４が更に９０°回転した状態を示している。また、図１０（ｄ）は、図１０（ｃ）に示す状態から回転軸２４が更に９０°回転した状態を示している。そして、図１０（ｄ）に示す状態から回転軸２４が更に９０°回転すると、図１０（ａ）に示す状態に戻る。図１０（ａ）〜図１０（ｄ）に示すように、連結部材６２は、回転軸２４とウォーム軸５２との軸ずれを許容した状態のまま、回転軸２４の回転をウォーム軸５２に伝達する。そのため、回転軸２４は、同回転軸２４の中心軸線Ｌ１を回転中心として回転するとともに、ウォーム軸５２は、同ウォーム軸５２の中心軸線Ｌ２を回転中心として回転することができる。従って、回転軸２４の先端部が振れ回ったり、ウォーム軸５２の基端部が振れ回ったりすることが抑制される。例えば、ウォーム軸５２の基端部が振れ回ると、ウォーム軸５２の基端部を軸支する軸受４３の内周面にウォーム軸５２の基端部が繰り返し衝突することにより異音が発生するおそれがある。これに対し、本実施形態では、ウォーム軸５２の基端部が振れ回ることが抑制されるため、回転軸２４の回転時に異音が発生することが抑制される。 FIG. 10B shows a state in which the rotating shaft 24 is rotated by 90 ° from the state shown in FIG. 10A. Further, FIG. 10 (c) shows a state in which the rotating shaft 24 is further rotated by 90 ° from the state shown in FIG. 10 (b). Further, FIG. 10 (d) shows a state in which the rotating shaft 24 is further rotated by 90 ° from the state shown in FIG. 10 (c). Then, when the rotation shaft 24 further rotates 90 ° from the state shown in FIG. 10 (d), the state returns to the state shown in FIG. 10 (a). As shown in FIGS. 10A to 10D, the connecting member 62 transmits the rotation of the rotating shaft 24 to the worm shaft 52 while allowing the axis deviation between the rotating shaft 24 and the worm shaft 52. To do. Therefore, the rotating shaft 24 can rotate about the central axis L1 of the rotating shaft 24 as the center of rotation, and the worm shaft 52 can rotate about the central axis L2 of the worm shaft 52 as the center of rotation. Therefore, it is possible to prevent the tip end portion of the rotating shaft 24 from swinging around and the base end portion of the worm shaft 52 from swinging around. For example, when the base end portion of the worm shaft 52 swings around, the base end portion of the worm shaft 52 repeatedly collides with the inner peripheral surface of the bearing 43 that pivotally supports the base end portion of the worm shaft 52, and an abnormal noise is generated. There is a risk. On the other hand, in the present embodiment, since the base end portion of the worm shaft 52 is suppressed from swinging around, it is possible to suppress the generation of abnormal noise when the rotating shaft 24 is rotated.

図１に示すように、従動側回転体６５の回転に伴ってウォーム軸５２が回転されると、その回転は、ウォーム軸５２及びウォームホイール５３にて減速されて出力軸５４から出力される。なお、図８（ａ）、図８（ｂ）、図９（ａ）及び図９（ｂ）では、モータ部１１側から軸方向Ｘ１に見て連結部材６２が反時計方向に回転された場合のクラッチ１３を図示しているが、時計方向に回転された場合にも同様に連結部材６２から従動側挿入部１０２に回転駆動力が伝達される。ただし、図８（ａ）、図８（ｂ）、図９（ａ）及び図９（ｂ）において、連結部材６２が時計方向に回転された場合には、駆動側伝達面７５ａは第２従動側伝達面１０５に当接する。 As shown in FIG. 1, when the worm shaft 52 is rotated with the rotation of the driven side rotating body 65, the rotation is decelerated by the worm shaft 52 and the worm wheel 53 and output from the output shaft 54. In addition, in FIG. 8A, FIG. 8B, FIG. 9A and FIG. 9B, when the connecting member 62 is rotated counterclockwise when viewed from the motor unit 11 side in the axial direction X1. Although the clutch 13 of the above is shown in the figure, the rotational driving force is similarly transmitted from the connecting member 62 to the driven side insertion portion 102 even when the clutch 13 is rotated clockwise. However, in FIGS. 8 (a), 8 (b), 9 (a) and 9 (b), when the connecting member 62 is rotated clockwise, the drive side transmission surface 75a is second driven. It abuts on the side transmission surface 105.

本実施形態の作用について説明する。
回転軸２４の回転時には、二面幅部３２が連結平面部７２ｃに当接して回転方向に係合することにより、回転軸２４と連結部材６２とが一体回転する。そして、二面幅部３２が有する平面部３２ａと曲面部３２ｂとの境界部分の角部３２ｃは、二面幅孔部７２ａの連結曲面部７２ｄでなはく連結平面部７２ｃに押し付けられる。従って、当該角部３２ｃは、連結曲面部７２ｄに設けられた駆動側弾性部材７４に接触し難い。 The operation of this embodiment will be described.
When the rotating shaft 24 rotates, the width across flats 32 abuts on the connecting flat surface portion 72c and engages in the rotating direction, so that the rotating shaft 24 and the connecting member 62 rotate integrally. Then, the corner portion 32c of the boundary portion between the flat surface portion 32a and the curved surface portion 32b of the two-sided width portion 32 is pressed against the connecting flat surface portion 72c by the connecting curved surface portion 72d of the two-sided width hole portion 72a. Therefore, the corner portion 32c is unlikely to come into contact with the drive-side elastic member 74 provided on the connecting curved surface portion 72d.

また、曲面部３２ｂを径方向内側に押圧する駆動側弾性部材７４は弾性を有する。従って、連結部材６２が振れ回ったとしても、当該連結部材６２の振れ回りが駆動側弾性部材７４によって吸収される。よって、連結部材６２が大きく振れ回ることが抑制されるため、ウォーム軸５２の基端部が連結部材６２によって振り回されることが抑制される。また、回転軸２４の先端部が振れ回った場合にも、駆動側弾性部材７４が回転軸２４の先端部の振れ回りを吸収するため、連結部材６２が振れ回ることが抑制される。従って、この場合においても、ウォーム軸５２の基端部が連結部材６２によって振り回されることを抑制される。 Further, the drive-side elastic member 74 that presses the curved surface portion 32b inward in the radial direction has elasticity. Therefore, even if the connecting member 62 swings around, the swinging around of the connecting member 62 is absorbed by the drive-side elastic member 74. Therefore, since the connecting member 62 is suppressed from being largely swung around, the base end portion of the worm shaft 52 is suppressed from being swung around by the connecting member 62. Further, even when the tip of the rotating shaft 24 swings, the drive-side elastic member 74 absorbs the swing of the tip of the rotating shaft 24, so that the connecting member 62 is suppressed from swinging. Therefore, even in this case, it is possible to prevent the base end portion of the worm shaft 52 from being swung around by the connecting member 62.

本実施形態の効果について説明する。
（１）駆動側弾性部材７４は、回転軸２４の回転時に平面部３２ａと曲面部３２ｂとの境界部分の角部３２ｃが押し付けられる可能性の高い連結平面部７２ｃの周方向の両端部には設けられていない。そして、駆動側弾性部材７４は、回転軸２４の回転時に角部３２ｃが押し付けられる可能性の低い連結曲面部７２ｄに設けられている。従って、回転軸２４の回転時に、駆動側弾性部材７４に二面幅部３２の角部３２ｃが押し付けられることが抑制されるため、駆動側弾性部材７４の断裂等が生じることが抑制される。その結果、駆動軸挿入孔７２の内周面に設けられる駆動側弾性部材７４の耐久性の低下を抑制できる。 The effect of this embodiment will be described.
(1) The drive-side elastic member 74 is attached to both ends of the connecting flat surface portion 72c in the circumferential direction in which the corner portions 32c of the boundary portion between the flat surface portion 32a and the curved surface portion 32b are likely to be pressed when the rotating shaft 24 is rotated. Not provided. The drive-side elastic member 74 is provided on the connecting curved surface portion 72d, which is unlikely to be pressed against the corner portion 32c when the rotating shaft 24 rotates. Therefore, when the rotating shaft 24 is rotated, it is suppressed that the corner portion 32c of the width across flat portion 32 is pressed against the driving side elastic member 74, so that the driving side elastic member 74 is prevented from being torn or the like. As a result, it is possible to suppress a decrease in the durability of the drive-side elastic member 74 provided on the inner peripheral surface of the drive shaft insertion hole 72.

（２）駆動側弾性部材７４は、軸方向Ｘ１に沿って延びている。そのため、二面幅部３２の曲面部３２ｂと駆動側弾性部材７４との間の摩擦力によって回転軸２４の先端部に連結部材６２を保持させやすくなる。従って、モータ１０へのクラッチ１３の組付けがより容易になる。また、連結部材６２の振れ回りが当該駆動側弾性部材７４によってより吸収されやすくなる。従って、連結部材６２が大きく振れ回ることがより抑制されるため、ウォーム軸５２の基端部が連結部材６２によって振り回されることを更に抑制できる。また、回転軸２４の先端部が振れ回った場合、回転軸２４の先端部の振れ回りが当該駆動側弾性部材７４によってより吸収されやすくなるため、連結部材６２が振れ回ることがより抑制される。従って、この場合においても、ウォーム軸５２の基端部が連結部材６２によって振り回されることをより抑制できる。その結果、回転軸２４の回転時における異音の発生をより抑制することができる。また、駆動側弾性部材７４を容易に形成できる。 (2) The drive-side elastic member 74 extends along the axial direction X1. Therefore, the connecting member 62 can be easily held at the tip of the rotating shaft 24 by the frictional force between the curved surface portion 32b of the width across flat portion 32 and the elastic member 74 on the driving side. Therefore, the clutch 13 can be more easily assembled to the motor 10. Further, the runout of the connecting member 62 is more easily absorbed by the drive-side elastic member 74. Therefore, it is possible to further suppress the large swing of the connecting member 62, so that the base end portion of the worm shaft 52 can be further suppressed from swinging by the connecting member 62. Further, when the tip portion of the rotating shaft 24 swings around, the swinging of the tip portion of the rotating shaft 24 is more easily absorbed by the drive-side elastic member 74, so that the swinging of the connecting member 62 is further suppressed. .. Therefore, even in this case, it is possible to further prevent the base end portion of the worm shaft 52 from being swung around by the connecting member 62. As a result, it is possible to further suppress the generation of abnormal noise when the rotating shaft 24 is rotated. Further, the drive side elastic member 74 can be easily formed.

（３）駆動側弾性部材７４は、連結曲面部７２ｄにおける二面幅部３２と径方向に重なる範囲の軸方向Ｘ１の一端から他端まで連続して延びている。そのため、二面幅部３２の曲面部３２ｂと駆動側弾性部材７４との間の摩擦力によって回転軸２４の先端部に連結部材６２をより保持させやすくなる。従って、モータ１０へのクラッチ１３の組付けが更に容易になる。また、連結部材６２の振れ回りが当該駆動側弾性部材７４によって更に吸収されやすくなる。従って、連結部材６２が大きく振れ回ることが更に抑制されるため、ウォーム軸５２の基端部が連結部材６２によって振り回されることを一層抑制できる。また、回転軸２４の先端部が振れ回った場合、回転軸２４の先端部の振れ回りが当該駆動側弾性部材７４によって更に吸収されやすくなるため、連結部材６２が振れ回ることが更に抑制される。従って、この場合においても、ウォーム軸５２の基端部が連結部材６２によって振り回されることを更に抑制できる。その結果、回転軸２４の回転時における異音の発生を一層抑制できる。 (3) The drive-side elastic member 74 continuously extends from one end to the other end in the axial direction X1 in a range that overlaps the width across flats 32 in the connecting curved surface portion 72d in the radial direction. Therefore, the frictional force between the curved surface portion 32b of the width across flat portion 32 and the elastic member 74 on the drive side makes it easier to hold the connecting member 62 at the tip end portion of the rotating shaft 24. Therefore, the assembly of the clutch 13 to the motor 10 becomes easier. Further, the runout of the connecting member 62 is more easily absorbed by the drive-side elastic member 74. Therefore, since the connecting member 62 is further suppressed from swinging significantly, it is possible to further suppress the base end portion of the worm shaft 52 from swinging around by the connecting member 62. Further, when the tip portion of the rotating shaft 24 swings around, the swinging of the tip portion of the rotating shaft 24 is more easily absorbed by the drive-side elastic member 74, so that the swinging of the connecting member 62 is further suppressed. .. Therefore, even in this case, it is possible to further prevent the base end portion of the worm shaft 52 from being swung around by the connecting member 62. As a result, it is possible to further suppress the generation of abnormal noise when the rotating shaft 24 is rotated.

（４）連結部材６２における駆動軸挿入孔７２の外側開口部側の軸方向の端部に、軸方向Ｘ１から見て、二面幅孔部７２ａの外周を囲む環状をなす環状弾性部材７３が設けられている。そして、駆動側弾性部材７４は、環状弾性部材７３に連続している。そのため、駆動側弾性部材７４が連結曲面部７２ｄから剥離することを環状弾性部材７３によって抑制できる。例えば、駆動軸挿入孔７２に駆動側挿入部３１を挿入する際に、駆動側弾性部材７４に駆動側挿入部３１が軸方向Ｘ１から接触したとしても、当該駆動側弾性部材７４は環状弾性部材７３に支えられることにより駆動軸挿入孔７２の内周面から剥離することが抑制される。 (4) At the axial end of the drive shaft insertion hole 72 of the connecting member 62 on the outer opening side, an annular elastic member 73 forming an annular shape surrounding the outer periphery of the width across flats 72a when viewed from the axial direction X1 is provided. It is provided. The drive-side elastic member 74 is continuous with the annular elastic member 73. Therefore, the annular elastic member 73 can prevent the drive-side elastic member 74 from peeling off from the connecting curved surface portion 72d. For example, when the drive side insertion portion 31 is inserted into the drive shaft insertion hole 72, even if the drive side insertion portion 31 comes into contact with the drive side elastic member 74 from the axial direction X1, the drive side elastic member 74 is an annular elastic member. By being supported by 73, peeling from the inner peripheral surface of the drive shaft insertion hole 72 is suppressed.

（５）駆動側許容隙間Ｇ１は、対向する平面部３２ａと連結平面部７２ｃとの間、及び、対向する曲面部３２ｂと連結曲面部７２ｄとの間にそれぞれ形成される。従って、駆動側挿入部３１は、駆動軸挿入孔７２に対して連結平面部７２ｃと平行な方向及び連結平面部７２ｃと直交する方向との両方向に相対移動可能である。よって、駆動軸挿入孔７２内での駆動側挿入部３１の径方向における移動方向の自由度が高められる。従って、対向する平面部３２ａと連結平面部７２ｃとの間に駆動側許容隙間が設けられない場合に比べて、回転軸２４に対するより多くの方向の連結部材６２の軸ずれ、及び回転軸２４に対するより多くの方向のウォーム軸５２の軸ずれを、連結部材６２において許容できる。 (5) The drive-side allowable gap G1 is formed between the opposing flat surface portion 32a and the connecting flat surface portion 72c, and between the opposing curved surface portion 32b and the connecting curved surface portion 72d, respectively. Therefore, the drive-side insertion portion 31 can move relative to the drive shaft insertion hole 72 in both a direction parallel to the connection plane portion 72c and a direction orthogonal to the connection plane portion 72c. Therefore, the degree of freedom in the radial direction of the drive-side insertion portion 31 in the drive shaft insertion hole 72 is increased. Therefore, as compared with the case where the drive side allowable gap is not provided between the opposing flat surface portion 32a and the connecting flat surface portion 72c, the axial deviation of the connecting member 62 in more directions with respect to the rotating shaft 24 and the axial deviation with respect to the rotating shaft 24 A misalignment of the worm shaft 52 in more directions can be tolerated in the connecting member 62.

（６）従動側許容隙間Ｇ２は、連結面７５ｂと従動側挿入部１０２の外周面との間、及び、駆動側伝達面７５ａと従動側挿入部１０２の外周面との間に形成される。従って、従動側挿入部１０２は、従動軸挿入孔７５に対して駆動側伝達面７５ａと平行な方向及び駆動側伝達面７５ａと直交する方向との両方向に相対移動可能である。このように、連結部材６２は、回転軸２４側とウォーム軸５２側との両方で回転軸２４とウォーム軸５２との軸ずれを許容することができるため、回転軸２４とウォーム軸５２とのより大きな軸ずれを許容することが可能となる。従って、回転軸２４の回転時に、回転軸２４の先端部、連結部材６２及びウォーム軸５２の基端部に径方向の荷重がかかることがより抑制されるため、異音の発生をより一層抑制できる。 (6) The driven side allowable gap G2 is formed between the connecting surface 75b and the outer peripheral surface of the driven side insertion portion 102, and between the driving side transmission surface 75a and the outer peripheral surface of the driven side insertion portion 102. Therefore, the driven side insertion portion 102 can move relative to the driven shaft insertion hole 75 in both a direction parallel to the drive side transmission surface 75a and a direction orthogonal to the drive side transmission surface 75a. As described above, since the connecting member 62 can allow the rotation shaft 24 and the worm shaft 52 to deviate from each other on both the rotation shaft 24 side and the worm shaft 52 side, the rotation shaft 24 and the worm shaft 52 It is possible to tolerate a larger axial deviation. Therefore, when the rotating shaft 24 is rotated, the radial load is further suppressed from being applied to the tip end portion of the rotating shaft 24, the connecting member 62, and the base end portion of the worm shaft 52, so that the generation of abnormal noise is further suppressed. it can.

本実施形態は、以下のように変更して実施することができる。本実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
・連結部材６２は、弾性を有し平面部３２ａを径方向内側に押圧する第２駆動側弾性部材を有するものであってもよい。 This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
The connecting member 62 may have a second driving-side elastic member that has elasticity and presses the flat surface portion 32a inward in the radial direction.

図１１及び図１２に示す連結部材６２Ａは、弾性を有し二面幅部３２の平面部３２ａを径方向内側に押圧する第２駆動側弾性部材７４Ａを有する。図１１及び図１２では、上記実施形態と同一の構成及び対応する構成に同一の符号を付している。連結部材６２Ａにおいては、連結曲面部７２ｄに設けられた駆動側弾性部材７４を第１駆動側弾性部材７４とする。各連結平面部７２ｃにおいて、第２駆動側弾性部材７４Ａは、連結平面部７２ｃにおける二面幅孔部７２ａの長手方向の両端部の駆動軸挿入孔７２の内部に露出した部分よりも同連結平面部７２ｃにおける二面幅孔部７２ａの長手方向の中央寄りの部分に設けられている。即ち、各連結平面部７２ｃにおいて、第２駆動側弾性部材７４Ａは、連結平面部７２ｃの周方向の両端部における駆動軸挿入孔７２の内部に露出した部分よりも同連結平面部７２ｃの周方向の中央寄りの部分に設けられている。なお、本明細書において、「連結平面部の周方向の両端部が駆動軸挿入孔の内部に露出する」とは、連結平面部の周方向の端から同連結平面部の周方向の中央側に周方向の幅を持つ範囲が駆動軸挿入孔の内部に露出することを意味する。本例では、第２駆動側弾性部材７４Ａは、連結平面部７２ｃの周方向の中央部に設けられている。そして、連結平面部７２ｃにおける第２駆動側弾性部材７４Ａの周方向の両側の部分は、駆動軸挿入孔７２の内部に露出する露出部７２ｇになっている。即ち、第２駆動側弾性部材７４Ａは、連結平面部７２ｃにおいて周方向の両端部に設けられた露出部７２ｇの間に設けられている。第２駆動側弾性部材７４Ａは、軸方向Ｘ１に沿って連結平面部７２ｃの軸方向の一端から他端まで連続して延びる突条をなしている。第２駆動側弾性部材７４Ａは、同第２駆動側弾性部材７４Ａが設けられた連結平面部７２ｃよりも径方向内側に突出している。駆動側挿入部３１が駆動軸挿入孔７２に挿入されていない状態においては、一方の第２駆動側弾性部材７４Ａと他方の第２駆動側弾性部材７４Ａとの間の距離は、二面幅部３２の短手方向の幅より狭い。そのため、駆動側挿入部３１が駆動軸挿入孔７２に挿入された状態では、各第２駆動側弾性部材７４Ａは、二面幅部３２の平面部３２ａを径方向内側に押圧する。なお、図１２は、駆動軸挿入孔７２に駆動側挿入部３１が挿入されていない状態の連結部材６２Ａを図示するとともに、駆動側挿入部３１を二点鎖線の仮想線で図示している。 The connecting member 62A shown in FIGS. 11 and 12 has a second driving side elastic member 74A that has elasticity and presses the flat surface portion 32a of the width across flat portion 32 inward in the radial direction. In FIGS. 11 and 12, the same configurations as those in the above embodiment and the corresponding configurations are designated by the same reference numerals. In the connecting member 62A, the driving side elastic member 74 provided on the connecting curved surface portion 72d is referred to as the first driving side elastic member 74. In each connecting flat surface portion 72c, the second drive-side elastic member 74A is the same connecting flat surface as the portions exposed inside the drive shaft insertion holes 72 at both ends in the longitudinal direction of the two-sided width hole portion 72a in the connecting flat surface portion 72c. It is provided in a portion closer to the center in the longitudinal direction of the width across flat hole portion 72a in the portion 72c. That is, in each connecting flat portion 72c, the second drive-side elastic member 74A is in the circumferential direction of the connecting flat portion 72c rather than the portions exposed inside the drive shaft insertion hole 72 at both ends in the circumferential direction of the connecting flat portion 72c. It is provided in the part near the center of. In the present specification, "both ends of the connecting flat surface portion in the circumferential direction are exposed inside the drive shaft insertion hole" means that the peripheral end of the connecting flat surface portion is exposed to the central side in the circumferential direction of the connecting flat surface portion. It means that the range having the width in the circumferential direction is exposed inside the drive shaft insertion hole. In this example, the second drive-side elastic member 74A is provided at the center of the connecting flat surface portion 72c in the circumferential direction. The portions on both sides of the second drive-side elastic member 74A in the connecting flat surface portion 72c in the circumferential direction are exposed portions 72g exposed inside the drive shaft insertion hole 72. That is, the second drive-side elastic member 74A is provided between the exposed portions 72g provided at both ends in the circumferential direction in the connecting flat portion 72c. The second drive-side elastic member 74A has a ridge extending continuously from one end to the other end in the axial direction of the connecting flat surface portion 72c along the axial direction X1. The second drive-side elastic member 74A projects radially inward from the connecting flat surface portion 72c provided with the second drive-side elastic member 74A. When the drive-side insertion portion 31 is not inserted into the drive shaft insertion hole 72, the distance between one second drive-side elastic member 74A and the other second drive-side elastic member 74A is a width across flats. It is narrower than the width of 32 in the lateral direction. Therefore, when the drive-side insertion portion 31 is inserted into the drive shaft insertion hole 72, each of the second drive-side elastic members 74A presses the flat surface portion 32a of the width across flats portion 32 inward in the radial direction. Note that FIG. 12 illustrates the connecting member 62A in which the drive-side insertion portion 31 is not inserted into the drive shaft insertion hole 72, and the drive-side insertion portion 31 is illustrated by a virtual line of a two-dot chain line.

このようにすると、第２駆動側弾性部材７４Ａは、回転軸２４の回転時に平面部３２ａと曲面部３２ｂとの境界部分の角部３２ｃが押し付けられる可能性の高い連結平面部７２ｃの周方向の両端部には設けられていない。そして、第２駆動側弾性部材７４Ａは、回転軸２４の回転時に角部３２ｃが押し付けられる可能性の低い、連結平面部７２ｃの周方向の両端部の露出部７２ｇよりも同連結平面部７２ｃの周方向の中央寄りの部分に設けられている。従って、回転軸２４の回転時に、第２駆動側弾性部材７４Ａに平面部３２ａと曲面部３２ｂとの境界部分の角部３２ｃが押し付けられることが抑制されるため、第２駆動側弾性部材７４Ａの断裂等が生じることが抑制される。その結果、駆動軸挿入孔７２の内周面に設けられる第２駆動側弾性部材７４Ａの耐久性の低下を抑制できる。 In this way, the second drive-side elastic member 74A is in the circumferential direction of the connecting flat surface portion 72c in which the corner portion 32c of the boundary portion between the flat surface portion 32a and the curved surface portion 32b is likely to be pressed when the rotating shaft 24 is rotated. Not provided at both ends. The second drive-side elastic member 74A has a connecting flat portion 72c that is less likely to be pressed against the corner portion 32c when the rotating shaft 24 rotates than the exposed portions 72g at both ends in the circumferential direction of the connecting flat portion 72c. It is provided near the center in the circumferential direction. Therefore, when the rotating shaft 24 is rotated, it is suppressed that the corner portion 32c of the boundary portion between the flat surface portion 32a and the curved surface portion 32b is pressed against the second driving side elastic member 74A, so that the second driving side elastic member 74A The occurrence of rupture or the like is suppressed. As a result, it is possible to suppress a decrease in durability of the second drive-side elastic member 74A provided on the inner peripheral surface of the drive shaft insertion hole 72.

また、二面幅部３２の平面部３２ａと第２駆動側弾性部材７４Ａとの間の摩擦力によって回転軸２４の先端部に連結部材６２Ａをより保持させやすくなる。従って、モータ１０へのクラッチの組付けが更に容易になる。また、連結部材６２Ａの振れ回りが当該第２駆動側弾性部材７４Ａによっても吸収される。そのため、連結部材６２Ａが大きく振れ回ることが一層抑制されるため、ウォーム軸５２の基端部が連結部材６２Ａによって振り回されることをより一層抑制できる。また、回転軸２４の先端部が振れ回った場合、回転軸２４の先端部の振れ回りが当該第２駆動側弾性部材７４Ａによっても吸収されるため、連結部材６２Ａが振れ回ることが一層抑制される。従って、この場合においても、ウォーム軸５２の基端部が連結部材６２Ａによって振り回されることを一層抑制できる。その結果、回転軸２４の回転時における異音の発生をより一層抑制できる。 Further, the frictional force between the flat surface portion 32a of the width across flat portion 32 and the elastic member 74A on the second drive side makes it easier to hold the connecting member 62A at the tip end portion of the rotating shaft 24. Therefore, assembling the clutch to the motor 10 becomes easier. The swing of the connecting member 62A is also absorbed by the second drive-side elastic member 74A. Therefore, it is possible to further suppress the large swing of the connecting member 62A, so that the base end portion of the worm shaft 52 can be further suppressed from being swung by the connecting member 62A. Further, when the tip of the rotating shaft 24 swings, the swing of the tip of the rotating shaft 24 is also absorbed by the second drive-side elastic member 74A, so that the connecting member 62A is further suppressed from swinging. To. Therefore, even in this case, it is possible to further prevent the base end portion of the worm shaft 52 from being swung around by the connecting member 62A. As a result, it is possible to further suppress the generation of abnormal noise when the rotating shaft 24 is rotated.

上記実施形態では、駆動側弾性部材７４は、環状弾性部材７３に連続している。しかしながら、駆動側弾性部材７４は、必ずしも環状弾性部材７３に連続していなくてもよい。
・環状弾性部材７３は、上記実施形態の形状に限らない。環状弾性部材７３は、軸方向Ｘ１における連結部材６２の端部であって駆動軸挿入孔７２の外側開口部側の端部に設けられるとともに、軸方向Ｘ１から見て二面幅孔部７２ａの外周を囲む環状をなすものであればよい。例えば、環状弾性部材７３は、押圧部７３ａを備えない構成であってもよい。また例えば、環状弾性部材７３は、連結部材６２における駆動軸挿入孔７２の外側開口部側の軸方向Ｘ１の端面に設けられてもよい。また、連結部材６２は、必ずしも環状弾性部材７３を備えなくてもよい。 In the above embodiment, the drive-side elastic member 74 is continuous with the annular elastic member 73. However, the drive-side elastic member 74 does not necessarily have to be continuous with the annular elastic member 73.
The annular elastic member 73 is not limited to the shape of the above embodiment. The annular elastic member 73 is an end portion of the connecting member 62 in the axial direction X1 and is provided at the end portion on the outer opening side of the drive shaft insertion hole 72. Anything that forms an annular shape surrounding the outer circumference may be used. For example, the annular elastic member 73 may be configured not to include the pressing portion 73a. Further, for example, the annular elastic member 73 may be provided on the end surface of the connecting member 62 in the axial direction X1 on the outer opening side of the drive shaft insertion hole 72. Further, the connecting member 62 does not necessarily have to include the annular elastic member 73.

・上記実施形態では、駆動側弾性部材７４は、各連結曲面部７２ｄの周方向の中央部に１つずつ設けられている。駆動側弾性部材７４は、必ずしも連結曲面部７２ｄの周方向の中央部に設けられなくてもよい。例えば、駆動側弾性部材７４は、連結曲面部７２ｄの周方向の中央から周方向にずれた位置に設けられてもよい。この場合、一方の連結曲面部７２ｄに設けられた駆動側弾性部材７４と他方の連結曲面部７２ｄに設けられた駆動側弾性部材７４とが周方向に１８０°間隔となるように設けられることが好ましい。また、駆動側弾性部材７４は、少なくとも一方の連結曲面部７２ｄに複数設けられてもよい。 In the above embodiment, one drive-side elastic member 74 is provided at the center of each connecting curved surface portion 72d in the circumferential direction. The drive-side elastic member 74 does not necessarily have to be provided at the central portion of the connecting curved surface portion 72d in the circumferential direction. For example, the drive-side elastic member 74 may be provided at a position deviated from the center of the connecting curved surface portion 72d in the circumferential direction. In this case, the drive-side elastic member 74 provided on one connecting curved surface portion 72d and the drive-side elastic member 74 provided on the other connecting curved surface portion 72d may be provided at intervals of 180 ° in the circumferential direction. preferable. Further, a plurality of drive-side elastic members 74 may be provided on at least one connecting curved surface portion 72d.

・駆動側弾性部材７４は、連結曲面部７２ｄに設けられるのであれば、形状及び形成範囲は上記実施形態のものに限らない。例えば、駆動側弾性部材７４は、連結曲面部７２ｄにおける二面幅部３２と径方向に重なる範囲の一端から他端まで連続して延び、更に、当該範囲の外にまで連続して延びるものであってもよい。また例えば、駆動側弾性部材７４は、連結曲面部７２ｄにおける二面幅部３２と径方向に重なる範囲の一部に設けられてもよい。また例えば、駆動側弾性部材７４は、軸方向Ｘ１に対して傾斜した方向に沿って延びるものであってもよい。 If the drive-side elastic member 74 is provided on the connecting curved surface portion 72d, the shape and formation range are not limited to those of the above embodiment. For example, the drive-side elastic member 74 continuously extends from one end to the other end of a range that overlaps the width across flats 32 in the connecting curved surface portion 72d in the radial direction, and further extends continuously outside the range. There may be. Further, for example, the drive-side elastic member 74 may be provided in a part of the range of the connecting curved surface portion 72d that overlaps with the width across flat portion 32 in the radial direction. Further, for example, the drive-side elastic member 74 may extend along a direction inclined with respect to the axial direction X1.

・駆動軸挿入孔７２は、拡径部７２ｂを備えなくてもよい。例えば、駆動軸挿入孔７２は、二面幅孔部７２ａのみから構成されるものであってもよい。
・上記実施形態では、駆動軸挿入孔７２と従動軸挿入孔７５とは連通されている。しかし、駆動軸挿入孔７２と従動軸挿入孔７５とは軸方向Ｘ１に分断されていてもよい。 The drive shaft insertion hole 72 does not have to include the enlarged diameter portion 72b. For example, the drive shaft insertion hole 72 may be composed of only the width across flats 72a.
In the above embodiment, the drive shaft insertion hole 72 and the driven shaft insertion hole 75 are communicated with each other. However, the drive shaft insertion hole 72 and the driven shaft insertion hole 75 may be separated in the axial direction X1.

・駆動軸挿入孔７２と従動軸挿入孔７５との回転方向の位置関係は上記実施形態の位置関係に限らない。例えば、従動軸挿入孔７５は、駆動側伝達面７５ａと直交する方向が連結平面部７２ｃと直交する方向と同方向となるように形成されてもよい。 The positional relationship between the drive shaft insertion hole 72 and the driven shaft insertion hole 75 in the rotational direction is not limited to the positional relationship of the above embodiment. For example, the driven shaft insertion hole 75 may be formed so that the direction orthogonal to the driving side transmission surface 75a is the same as the direction orthogonal to the connecting plane portion 72c.

・第１従動側弾性部材７６及び第２従動側弾性部材７７は、必ずしも従動軸挿入孔７５の内周面に設けられなくてもよい。
・クラッチ１３は、内周面に駆動側弾性部材７４が設けられた駆動軸挿入孔７２及び従動軸挿入孔７５を有する連結部材６２を備えていれば、その他の構成は上記実施形態の構成に限らない。 The first driven side elastic member 76 and the second driven side elastic member 77 do not necessarily have to be provided on the inner peripheral surface of the driven shaft insertion hole 75.
If the clutch 13 includes a drive shaft insertion hole 72 provided with a drive side elastic member 74 on the inner peripheral surface and a connecting member 62 having a driven shaft insertion hole 75, the other configurations are the same as those of the above embodiment. Not exclusively.

・上記実施形態では、従動側挿入部１０２は、ウォーム軸５２の軸方向と直交する断面形状が略楕円形状をなしている。しかしながら、従動側挿入部１０２の形状はこれに限らない。従動側挿入部１０２は、従動軸挿入孔７５の内周面と回転方向に係合可能なように、ウォーム軸５２の軸方向と直交する断面形状が短手方向と長手方向とを有する形状であればよい。 In the above embodiment, the driven side insertion portion 102 has a substantially elliptical cross-sectional shape orthogonal to the axial direction of the worm shaft 52. However, the shape of the driven side insertion portion 102 is not limited to this. The driven side insertion portion 102 has a cross-sectional shape orthogonal to the axial direction of the worm shaft 52 having a lateral direction and a longitudinal direction so that it can engage with the inner peripheral surface of the driven shaft insertion hole 75 in the rotational direction. All you need is.

・駆動側挿入部３１は、回転軸２４とは別体で形成されて回転軸２４の先端部に一体回転可能に固定されるものであってもよい。従動側挿入部１０２は、ウォーム軸５２とは別体で形成されてウォーム軸５２の基端部に一体回転可能に固定されるものであってもよい。 The drive-side insertion portion 31 may be formed separately from the rotary shaft 24 and fixed to the tip end portion of the rotary shaft 24 so as to be integrally rotatable. The driven side insertion portion 102 may be formed separately from the worm shaft 52 and fixed to the base end portion of the worm shaft 52 so as to be integrally rotatable.

・減速機構５１は、ウォーム軸５２を含むものであれば、上記実施形態の構成に限らない。例えば、減速機構５１は、ウォーム軸５２の回転が伝達される複数の減速ギヤを備えた構成であってもよい。 The deceleration mechanism 51 is not limited to the configuration of the above embodiment as long as it includes the worm shaft 52. For example, the reduction mechanism 51 may be configured to include a plurality of reduction gears to which the rotation of the worm shaft 52 is transmitted.

上記実施形態及び変更例から把握できる技術的思想について記載する。
（イ）前記連結部材は、弾性を有し前記平面部を径方向内側に押圧する第２駆動側弾性部材を備え、前記第２駆動側弾性部材は、前記連結平面部の周方向の両端部における前記駆動軸挿入孔の内部に露出した部分よりも同連結平面部の周方向の中央寄りの部分に設けられているモータ。 The technical idea that can be grasped from the above-described embodiment and modified example will be described.
(A) The connecting member includes a second driving-side elastic member having elasticity and pressing the flat surface portion inward in the radial direction, and the second driving-side elastic member has both ends in the circumferential direction of the connecting flat surface portion. A motor provided in a portion closer to the center in the circumferential direction of the connecting flat surface portion than a portion exposed inside the drive shaft insertion hole in the above.

１０…モータ、１３…クラッチ、２４…回転軸、３１…駆動側挿入部、３２…二面幅部、３２ａ…平面部、３２ｂ…曲面部、５１…減速機構、５２…ウォーム軸、６２，６２Ａ…連結部材、７２…駆動軸挿入孔、７２ａ…二面幅孔部、７２ｃ…連結平面部、７２ｄ…連結曲面部、７３…環状弾性部材、７４…駆動側弾性部材、７５…従動軸挿入孔、１０２…従動側挿入部、Ｇ１…駆動側許容隙間、Ｘ１…軸方向。 10 ... motor, 13 ... clutch, 24 ... rotating shaft, 31 ... drive side insertion part, 32 ... width across flats, 32a ... flat surface, 32b ... curved surface, 51 ... reduction mechanism, 52 ... worm shaft, 62, 62A ... Connecting member, 72 ... Drive shaft insertion hole, 72a ... Width across flats, 72c ... Connecting flat surface, 72d ... Connecting curved surface, 73 ... Annular elastic member, 74 ... Driving side elastic member, 75 ... Driven shaft insertion hole , 102 ... Driven side insertion part, G1 ... Drive side allowable clearance, X1 ... Axial direction.

Claims (4)

回転される回転軸（２４）と、
前記回転軸と同軸となるように配置されるウォーム軸（５２）を含む減速機構（５１）と、
前記回転軸と前記ウォーム軸とを一体回転可能に連結する連結部材（６２，６２Ａ）を有するクラッチ（１３）と
を備え、
前記回転軸は、前記回転軸の先端部に駆動側挿入部（３１）を有し、
前記ウォーム軸は、前記ウォーム軸の基端部に従動側挿入部（１０２）を有し、
前記連結部材は、前記駆動側挿入部が挿入され前記駆動側挿入部が回転方向に係合する内周面を有する駆動軸挿入孔（７２）と、前記従動側挿入部が挿入され前記従動側挿入部が回転方向に係合する内周面を有する従動軸挿入孔（７５）とを備え、
前記駆動側挿入部は、互いに平行をなす一対の平面部（３２ａ）と前記一対の平面部の間に位置する一対の曲面部（３２ｂ）とを有する外周面を備えた二面幅形状の二面幅部（３２）を有し、
前記駆動軸挿入孔は、互いに平行をなす一対の連結平面部（７２ｃ）と前記一対の連結平面部の間に位置する一対の連結曲面部（７２ｄ）とを有する内周面を備えた二面幅形状をなし前記二面幅部が挿入される二面幅孔部（７２ａ）を有し、
対向する前記平面部と前記連結平面部との間、及び、対向する前記曲面部と前記連結曲面部との間に、前記駆動軸挿入孔内での前記駆動側挿入部の径方向の移動を許容する駆動側許容隙間（Ｇ１）を備え、
前記連結曲面部には、弾性を有し前記曲面部を径方向内側に押圧する駆動側弾性部材（７４）が設けられ、
前記連結平面部の周方向の両端部は、前記駆動軸挿入孔の内部に露出しているモータ。 The rotating shaft (24) to be rotated and
A deceleration mechanism (51) including a worm shaft (52) arranged so as to be coaxial with the rotation shaft, and
A clutch (13) having a connecting member (62, 62A) for integrally rotatably connecting the rotating shaft and the worm shaft is provided.
The rotating shaft has a drive side insertion portion (31) at the tip end portion of the rotating shaft.
The worm shaft has a driven side insertion portion (102) at the base end portion of the worm shaft.
The connecting member has a drive shaft insertion hole (72) having an inner peripheral surface into which the drive-side insertion portion is inserted and the drive-side insertion portion engages in the rotational direction, and the driven-side insertion portion into which the driven-side insertion portion is inserted. A driven shaft insertion hole (75) having an inner peripheral surface with which the insertion portion engages in the rotational direction is provided.
The drive-side insertion portion has a two-sided width shape having an outer peripheral surface having a pair of flat surface portions (32a) parallel to each other and a pair of curved surface portions (32b) located between the pair of flat surface portions. It has a surface width portion (32) and has a surface width portion (32).
The drive shaft insertion hole has two surfaces having an inner peripheral surface having a pair of connecting flat surfaces (72c) parallel to each other and a pair of connecting curved surfaces (72d) located between the pair of connecting flat surfaces. It has a width shape and has a width across flats (72a) into which the width across flats is inserted.
The radial movement of the drive-side insertion portion in the drive shaft insertion hole is performed between the facing flat surface portion and the connecting flat surface portion and between the opposing curved surface portion and the connecting curved surface portion. With an allowable drive side clearance (G1)
The connecting curved surface portion is provided with a drive-side elastic member (74) that has elasticity and presses the curved surface portion inward in the radial direction.
Both ends of the connecting flat surface portion in the circumferential direction are exposed inside the drive shaft insertion hole. 前記駆動側弾性部材は、前記回転軸の軸方向（Ｘ１）に沿って延びている請求項１に記載のモータ。 The motor according to claim 1, wherein the drive-side elastic member extends along the axial direction (X1) of the rotation shaft. 前記駆動側弾性部材は、少なくとも前記連結曲面部における前記二面幅部と径方向に重なる範囲の前記軸方向の一端から他端まで連続して延びている請求項２に記載のモータ。 The motor according to claim 2, wherein the drive-side elastic member continuously extends from one end to the other end in the axial direction in a range that overlaps with the width across flats in the connecting curved surface portion in the radial direction. 前記連結部材は、前記回転軸の軸方向における前記連結部材の端部であって前記駆動軸挿入孔の外側開口部側の端部に、前記軸方向から見て前記二面幅孔部の外周を囲む環状をなす環状弾性部材（７３）を有し、
前記駆動側弾性部材は、前記環状弾性部材に連続している請求項１から請求項３の何れか１項に記載のモータ。 The connecting member is an end portion of the connecting member in the axial direction of the rotating shaft, and is located at an end portion on the outer opening side of the drive shaft insertion hole, and is an outer periphery of the width across flat hole when viewed from the axial direction. Has an annular elastic member (73) forming an annular shape surrounding the
The motor according to any one of claims 1 to 3, wherein the drive-side elastic member is continuous with the annular elastic member.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007267595A (en) * 2001-04-25 2007-10-11 Asmo Co Ltd Motor
JP2008190678A (en) * 2007-02-07 2008-08-21 Sumitomo Denko Shoketsu Gokin Kk Sintered part with press-fit pin
JP2016094966A (en) * 2014-11-12 2016-05-26 アスモ株式会社 Joint structure, clutch and motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007267595A (en) * 2001-04-25 2007-10-11 Asmo Co Ltd Motor
JP2008190678A (en) * 2007-02-07 2008-08-21 Sumitomo Denko Shoketsu Gokin Kk Sintered part with press-fit pin
JP2016094966A (en) * 2014-11-12 2016-05-26 アスモ株式会社 Joint structure, clutch and motor

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