JP6828536B2 - Clutch and motor - Google Patents

Description

The present invention relates to a clutch and a motor.

Conventionally, a motor used as a drive source for a power window device mounted on a vehicle has a motor unit having a rotating shaft that is rotationally driven and a driven shaft that transmits the rotational driving force of the rotating shaft. Some are equipped with an output unit that outputs the rotational driving force transmitted to the vehicle. Then, as described in Patent Document 1, for example, the rotating shaft and the driven shaft transmit the rotational driving force of the rotating shaft to the driven shaft, but do not transmit the rotational force from the driven shaft side to the rotating shaft. It is connected via a clutch that operates on.

The clutch described in Patent Document 1 includes a drive-side rotating body that rotates integrally with a rotating shaft, a driven-side rotating body that can engage with the driving-side rotating body in the rotation direction and rotates integrally with the driven shaft, and a driving-side rotating body. It includes a cylindrical clutch housing in which the body and the driven side rotating body are inserted inside. Further, between the inner peripheral surface of the clutch housing and the driven side rotating body, the clutch housing is sandwiched (becomes a wedge) between the inner peripheral surface of the clutch housing and the driven side rotating body during non-rotational driving of the rotating shaft. A rolling element that prevents the rotation of the side rotating body (that is, the rotation of the driven shaft) is interposed. The rolling element is held by a support member inserted inside the clutch housing.

In such a clutch, when the rotary drive of the rotating shaft is started, the driving side rotating body comes into contact with the support member from the rotating direction of the driving side rotating body, and the rolling element is moved to the rotating direction of the driving side rotating body via the support member. By pressing, the pinching of the rolling element by the inner peripheral surface of the clutch housing and the driven side rotating body is released. Then, when the rotating shaft is rotationally driven, the support member rotates together with the driving side rotating body around the rotating axis of the driving side rotating body. Therefore, when the rotating shaft is rotationally driven, the rolling element rotates together with the driving side rotating body and the driven side rotating body along the rotating axis of the driving side rotating body along the inner peripheral surface of the clutch housing while being held by the support member. ..

Japanese Unexamined Patent Publication No. 2012-82952

As described above, at the start of the rotational drive of the rotating shaft (driving side rotating body), the driving side rotating body rotates relative to the support member, and the driving side rotating body becomes the support member from the rotation direction of the driving side rolling body. Abut. Then, when the rolling element is pressed in the rotation direction of the driving side rotating body through the support member while the driving side rotating body is in contact with the support member, the rolling body formed by the inner peripheral surface of the clutch housing and the driven side rotating body. The pinch is released. In this case, even if the driven-side rotating body, which has come to rotate integrally with the driving-side rotating body after the rolling body is released from being pinched, tries to hold the rolling body again with the inner peripheral surface of the clutch housing. Since the drive-side rotating body abuts on the support member from the rotation direction and continues to press, the support member holding the rolling body is rotating integrally with the drive-side rotating body. Therefore, the sandwiching of the rolling element between the inner peripheral surface of the clutch housing and the driven side rotating body is immediately released. Therefore, in this case, the sandwiching of the rolling element by the inner peripheral surface of the clutch housing and the driven side rotating body can be smoothly released, and noise is unlikely to be generated in the clutch at the start of the rotational drive of the rotating shaft.

However, at the start of the rotary drive of the rotating shaft, the support member is blown in the rotation direction of the driving side rotating body due to the impact when the driving side rotating body comes into contact with the support member, and the support member holding the rolling body is held. May rotate ahead of the drive-side rotating body. Then, even if the rolling element is once released from being sandwiched between the inner peripheral surface of the clutch housing and the driven side rotating body, the driven side whose rotational speed has increased until the driving side rotating body comes into contact with the support member again. It is pinched again by the rotating body with the inner peripheral surface of the clutch housing. Then, when the driving side rotating body comes into contact with the support member again in order to release the sandwiching of the rolling body between the inner peripheral surface of the clutch housing and the driven side rotating body, the impact becomes large and noise is generated. .. Further, due to the impact when the drive side rotating body comes into contact with the support member again, the support member holding the rolling body may rotate ahead of the driving side rotating body, and the above operation may be repeated. is there. In such a case, noise is generated a plurality of times in the clutch until the sandwiching of the rolling element by the inner peripheral surface of the clutch housing and the driven side rotating body is completely released.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a clutch and a motor capable of suppressing the generation of noise at the start of rotational driving of a driving side rotating body. is there.

The clutches that solve the above problems include an annular clutch housing, a drive-side rotating body that is rotationally driven, and a driven-side rotating body that is inserted inside the clutch housing and the rotational driving force is transmitted from the driving-side rotating body. It is arranged between the inner peripheral surface of the clutch housing and the driven side rotating body, and when the driving side rotating body is driven to rotate, it rotates together with the driving side rotating body around the rotation axis of the driving side rotating body. When the driving side rotating body is driven non-rotatingly, the rolling element that is sandwiched between the clutch housing and the driven side rotating body to prevent the driven side rotating body from rotating, the inner peripheral surface of the clutch housing, and the said A support member that holds the rolling element between the driven side rotating body and can rotate around the rotation axis of the driving side rotating body together with the driving side rotating body is provided, and rotation driving of the driving side rotating body is started. Occasionally, the driving side rotating body abuts on the support member from the rotation direction and presses the rolling body in the rotating direction via the support member, so that the clutch housing and the driven side rotating body form the rolling body. A clutch that releases the pinch, the support member generates a load that makes it difficult for the support member to rotate around the rotation axis of the drive-side rotating body at least at the start of rotational driving of the driving-side rotating body. The support member includes at least one contact portion of a first contact portion that contacts the clutch housing and a second contact portion that contacts the drive-side rotating body, and the load generating portion. Increases at least one of the frictional force between the clutch housing and the first contact portion and the frictional force between the driving side rotating body and the second contact portion. The support member has a portion that overlaps at least one of the clutch housing and the driving side rotating body in the rotation axis direction of the support member, and the load generating portion has a portion that overlaps with the rotation axis direction of the support member. It is an inclined surface that is inclined and comes into contact with the driving side rotating body from the rotation direction of the driving side rotating body at the start of rotational driving of the driving side rotating body .

According to this configuration, since the support member is provided with the load generating portion, it becomes difficult to rotate around the rotation axis of the driving side rotating body at the start of the rotational driving of the driving side rotating body. Therefore, at the start of the rotational drive of the driving side rotating body, the support member is blown in the rotating direction of the driving side rotating body by the impact when the driving side rotating body comes into contact with the support member from the rotating direction of the driving side rotating body. It is possible to suppress rotation ahead of the driving side rotating body. Therefore, after the drive-side rotating body comes into contact with the support member from the rotation direction of the driving-side rotating body, the driving-side rotating body and the support member tend to rotate integrally. Therefore, the support member is pressed by the driving side rotating body in the rotation direction of the driving side rotating body, so that the driven side rotating body is released from the clutch housing and the driven side rotating body is released from being sandwiched between the clutch housing and the driven side rotating body. Even if an attempt is made to pinch the rolling element again in the meantime, the pinching of the rolling element between the clutch housing and the driven side rotating body is immediately released. In this way, it is possible to prevent the drive-side rotating body from repeatedly separating or contacting the support member from the rotation direction of the driving-side rotating body at the start of rotational driving of the driving-side rotating body. It is possible to suppress the generation of noise at the start of the rotary drive of.

According to this configuration, at least one of the frictional force between the first contacting portion and the clutch housing and the frictional force between the second contacting portion and the driving side rotating body is caused by the load generating portion. Is increased. This frictional force makes it difficult for the support member to rotate around the rotation axis of the drive-side rotating body. Therefore, it is possible to easily prevent the support member from rotating in the rotation direction of the driving side rotating body ahead of the driving side rotating body at the start of the rotational driving of the driving side rotating body by the frictional force. As a result, it is possible to easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body.

According to this configuration, the inclined surface is inclined with respect to the rotation axis direction of the support member. Therefore, when the driving side rotating body comes into contact with the inclined surface from the rotation direction at the start of the rotational driving of the driving side rotating body, a component force in the rotation axis direction of the support member is generated from the pressing force by the driving side rotating body on the inclined surface. Will be done. By this component force, the support member is pressed toward the clutch housing or the driving side rotating body that overlaps in the rotation axis direction of the support member. As a result, it is possible to more easily prevent the support member from rotating in the rotation direction of the driving side rotating body ahead of the driving side rotating body at the start of the rotational driving of the driving side rotating body.
In the clutch, the load generating portion is the clutch housing or the driving side so that the first contact portion is pressed against the clutch housing or the second contact portion is pressed against the driving side rotating body. It is preferable to generate a pressing force that presses the support member toward the rotating body.

According to this configuration, the first contact portion is pressed against the clutch housing by the pressing force generated by the load generating portion, or the second contact portion is pressed against the driving side rotating body, so that the first contact portion is pressed. The frictional force between the clutch housing and the clutch housing, or between the second contact portion and the driving side rotating body is easily increased. Then, this frictional force makes it difficult for the support member to rotate around the rotation axis of the drive-side rotating body. Therefore, it is possible to more easily prevent the support member from rotating in the rotation direction of the driving side rotating body ahead of the driving side rotating body at the start of the rotational driving of the driving side rotating body. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body.

In the clutch, the drive-side rotating body is inclined with respect to the rotation axis direction of the driving-side rotating body, and at the start of rotational driving of the driving-side rotating body, the driving-side rotating body faces the inclined surface from the rotating direction of the driving-side rotating body. It is preferable to have a drive-side inclined surface that makes contact or line contact.

According to this configuration, at the start of the rotational drive of the driving side rotating body, the driving side inclined surface of the driving side rotating body is in surface contact or line contact with the inclined surface from the rotation direction of the driving side rotating body. Therefore, when the driven side inclined surface comes into contact with the inclined surface, a component force in the rotation axis direction of the support member can be stably and easily generated from the pressing force of the driving side rotating body. Then, by this component force, the support member is pressed toward the clutch housing or the driving side rotating body that overlaps in the rotation axis direction of the support member. Therefore, it is possible to more effectively suppress the support member from rotating in the rotation direction of the driving side rotating body ahead of the driving side rotating body at the start of the rotational driving of the driving side rotating body. As a result, it is possible to more effectively suppress the generation of noise at the start of the rotational drive of the drive-side rotating body.

The motor that solves the above problems includes a motor unit having a rotating shaft that is driven to rotate, the clutch having the driving side rotating body that rotates integrally with the rotating shaft, and a driven shaft that rotates integrally with the driven side rotating body. And an output unit that outputs a rotational driving force transmitted to the driven shaft.

According to this configuration, since the motor includes a clutch that suppresses the generation of noise at the start of the rotary drive of the drive-side rotating body, noise may be generated in the motor at the start of the rotary drive of the rotating shaft. It is suppressed.

According to the clutch and the motor of the present invention, it is possible to suppress the generation of noise at the start of the rotary drive of the drive side rotating body.

Sectional drawing of the motor of 1st Embodiment. A partially enlarged sectional view of the motor of the first embodiment. An exploded perspective view of the clutch according to the first embodiment. (A) is a side view of a support member holding a rolling element in the clutch of the first embodiment, and (b) is a bottom view of the support member. The side view of the drive side rotating body and the support member in 1st Embodiment. The partially enlarged view of the drive side rotating body and the support member in 1st Embodiment. (A) is a sectional view of the clutch according to the first embodiment (7a-7a sectional view in FIG. 2), and (b) is a sectional view of the clutch (7b-7b sectional view in FIG. 2). (A) and (b) are sectional views for explaining the operation of the clutch in 1st Embodiment. (A) and (b) are sectional views for explaining the operation of the clutch in 1st Embodiment. FIG. 5 is a side view of a support member holding a rolling element and a driving side rotating body according to the second embodiment. The cross-sectional view of the clutch excluding the driven side rotating body in 3rd Embodiment. FIG. 3 is a perspective view of a support member holding a rolling element in the clutch of the third embodiment. (A) is a plan view of a support member holding a rolling element in the clutch of the fourth embodiment, and (b) is a side view of the support member. (A) and (b) are schematic views showing a part of the clutch of the 4th embodiment. (A) is a plan view of a support member holding a rolling element in another form of clutch, and (b) is a side view of the support member. (A) is a plan view of a support member holding a rolling element in another form of clutch, and (b) is a side view of the support member.

<First Embodiment>
Hereinafter, the first embodiment of the motor provided with the clutch will be described.
The motor 10 of the present embodiment shown in FIG. 1 is provided in a power window device that electrically raises and lowers the window glass of a vehicle. The motor 10 is configured by integrally assembling a motor unit 20 that generates a rotational force and an output unit 30 that decelerates and outputs the rotation output by the motor unit 20. Further, the motor 10 includes a clutch 40 at a drive connecting portion between the motor unit 20 and the output unit 30.

The motor unit 20 of the present embodiment includes a DC motor. A magnet 22 is fixed to the inner peripheral surface of a bottomed tubular yoke housing 21 (hereinafter referred to as a yoke 21) constituting the motor unit 20, and an armature 23 is arranged inside the magnet 22. .. The armature 23 includes a rotating shaft 24 arranged at the center of the yoke 21. The base end portion (upper end portion in FIG. 1) of the rotating shaft 24 is pivotally supported by a bearing 25 provided at the center of the bottom portion of the yoke 21, and a cylinder is provided at a portion of the rotating shaft 24 near the tip end. The commutator 26 is fixed. Further, the tip end portion (lower end portion in FIG. 1) of the rotating shaft 24 is a connecting portion 24a having a width across flats chamfered in parallel from the cylindrical shape.

A flange portion 21a extending outward is formed in the opening of the yoke 21, and a brush holder 27 is fitted in the opening of the yoke 21. The brush holder 27 has a holder body 27a having a shape that closes the opening of the yoke 21, and a connector portion 27b that protrudes outward in the radial direction of the yoke 21 from the holder body 27a and is connected to an external connector (not shown). The holder body 27a holds a plurality of power supply brushes 28 that are electrically connected to the connector portion 27b by wiring (not shown) and are in sliding contact with the commutator 26. Further, the holder body 27a holds a bearing 29 in a substantially central portion thereof, and the bearing 29 pivotally supports a portion of the rotating shaft 24 between the commutator 26 and the connecting portion 24a. Then, when the external power supply supplied to the brush 28 via the connector portion 27b is supplied to the armature 23 via the commutator 26, the armature 23 (rotating shaft 24) is rotationally driven, that is, the motor portion 20 is driven. It is designed to be rotationally driven.

The output unit 30 is formed by accommodating a reduction mechanism 32 and the like in a resin gear housing 31. The gear housing 31 is provided with a fixing portion 31a for fixing the gear housing 31 to the motor portion 20 at a portion (upper end portion in FIG. 1) that faces the motor portion 20 in the axial direction. The fixed portion 31a has an outer shape similar to the outer shape of the flange portion 21a of the yoke 21, and the fixed portion 31a is formed with a housing recess 31b that opens toward the inside of the yoke 21. Then, with a part of the holder body 27a of the brush holder 27 inserted into the housing recess 31b, the flange portion 21a in contact with the fixing portion 31a is fixed to the fixing portion 31a by the screw 33, whereby the gear The yoke 21 is fixed to the housing 31, and the motor unit 20 and the output unit 30 are integrated. The brush holder 27 is sandwiched between the yoke 21 and the fixing portion 31a.

Further, in the gear housing 31, a clutch accommodating recess 31c is provided in the center of the bottom of the accommodating recess 31b in the axial direction, and extends from the center of the bottom of the clutch accommodating recess 31c along the central axis L1 direction of the rotating shaft 24. The worm shaft accommodating portion 31d is recessed. Further, in the gear housing 31, a wheel housing portion 31e is recessed on the side (right side in FIG. 1) of the worm shaft housing portion 31d. The wheel accommodating portion 31e and the worm shaft accommodating portion 31d are connected at a substantially central portion in the axial direction (longitudinal direction) of the worm shaft accommodating portion 31d.

A substantially columnar worm shaft 34 (driven shaft) is housed in the worm shaft accommodating portion 31d. The worm shaft 34 is made of a metal material, and a screw tooth-shaped worm portion 34a is formed at a substantially central portion in the axial direction thereof. The worm shaft 34 is axially supported at both ends in the axial direction by a pair of bearings 35 and 36 arranged at both ends in the axial direction of the worm shaft accommodating portion 31d, respectively. The worm shaft 34 arranged in the worm shaft accommodating portion 31d is axially supported by the bearings 35 and 36 and is arranged coaxially with the rotating shaft 24, that is, the central axis L1 of the rotating shaft 24 and the worm shaft 34. It is arranged so that the central axis L2 of the above is on the same straight line.

A disk-shaped worm wheel 37 that meshes with the worm portion 34a of the worm shaft 34 is rotatably housed in the wheel accommodating portion 31e. The worm wheel 37 and the worm shaft 34 form a reduction mechanism 32. That is, the reduction mechanism 32 of the present embodiment is a worm reduction mechanism (worm gear). Further, at the central portion of the worm wheel 37 in the radial direction, an output shaft 38 that extends in the axial direction of the worm wheel 37 (in the direction perpendicular to the paper surface in FIG. 1) and rotates integrally with the worm wheel 37 is provided. A wind glass of a vehicle is connected to the output shaft 38 via a wind regulator (not shown).

Further, the clutch 40 that connects the rotating shaft 24 of the motor unit 20 and the worm shaft 34 of the output unit 30 is housed in the clutch accommodating recess 31c.
As shown in FIGS. 2 and 3, the clutch 40 is composed of a clutch housing 41, a driving side rotating body 42, a support member 43, a rolling element 44, and a driven side rotating body 45.

The clutch housing 41 has a cylindrical shape, and a flange-shaped flange portion 41a extending radially outward is formed at one end of the clutch housing 41 in the axial direction. The outer diameter of the cylindrical portion of the clutch housing 41 is formed to be substantially equal to the inner diameter of the clutch accommodating recess 31c, and the outer diameter of the flange portion 41a is formed to be larger than the inner diameter of the clutch accommodating recess 31c. Further, the flange portion 41a is formed with fixing recesses 41b at four locations at equal angular intervals in the circumferential direction. Each fixing recess 41b penetrates the flange portion 41a in the axial direction and opens outward in the radial direction.

As shown in FIG. 2, the clutch housing 41 is inserted into the clutch accommodating recess 31c until the flange portion 41a abuts on the bottom surface of the accommodating recess 31b, and is fixed to the gear housing 31 at the flange portion 41a. .. More specifically, on the lower surface of the accommodating recess 31b and on the outer periphery of the opening of the clutch accommodating recess 31c, fixed projections 31f protruding in the axial direction are formed at four locations at equal angular intervals in the circumferential direction. These four fixing protrusions 31f are respectively inserted in the four fixing recesses 41b of the flange portion 41a in the axial direction, and the tip portion of each fixing protrusion 31f is processed by heat caulking. As a result, the clutch housing 41 is fixed to the gear housing 31 so that it cannot move in the axial direction and cannot rotate in the circumferential direction. The clutch housing 41 fixed to the gear housing 31 is arranged coaxially with the rotating shaft 24 and the worm shaft 34.

As shown in FIGS. 2 and 3, the drive-side rotating body 42 has a substantially cylindrical shaft connecting portion 51. A disk-shaped flange portion 52 extending outward in the radial direction is integrally formed on the outer peripheral surface of the shaft connecting portion 51.

In the shaft connecting portion 51, a drive shaft insertion hole 53 extending along the axial direction is formed at the axial center of the axial end portion (upper end portion in FIG. 2) on the motor portion 20 side. The drive shaft insertion hole 53 has a width across flats corresponding to the outer shape of the connecting portion 24a of the rotating shaft 24. Then, by press-fitting the connecting portion 24a into the drive shaft insertion hole 53, the drive-side rotating body 42 is integrally rotatably connected to the rotating shaft 24. The rotating shaft 24 and the driving side rotating body 42 connected to the rotating shaft 24 are coaxial (that is, their central axes are located on the same straight line).

Further, in the shaft connecting portion 51, a driven shaft insertion hole 54 extending along the axial direction is formed at the axial center of the axial end portion (lower end portion in FIG. 2) on the output portion 30 side. The central axis of the driven shaft insertion hole 54 coincides with the central axis of the drive shaft insertion hole 53. In the present embodiment, the drive shaft insertion hole 53 and the driven shaft insertion hole 54 communicate with each other.

As shown in FIG. 7B, the inner peripheral surface of the driven shaft insertion hole 54 has a plane shape parallel to the axial direction and has a pair of drive-side transmission surfaces 54a parallel to each other. The driven shaft insertion hole 54 has a substantially track shape (2) in which the shape seen from the axial direction is the longitudinal direction in the direction parallel to the drive side transmission surface 54a and the short direction in the direction orthogonal to the drive side transmission surface 54a. Surface width shape). In addition, each drive side transmission surface 54a is provided with two first elastic members 55 made of an elastic material such as a rubber material. Further, in the axial direction, second elastic members 56 made of an elastic material such as a rubber material are provided at both ends of the driven shaft insertion hole 54 in the longitudinal direction. The first and second elastic members 55 and 56 slightly project inward from the inner peripheral surface of the driven shaft insertion hole 54.

Further, as shown in FIGS. 3 and 7A, the drive-side rotating body 42 releases a pair of rolling elements extending axially from the flange portion 52 to the output portion 30 side (lower side in FIG. 3). It has a part 57. The rolling element releasing portions 57 are provided on both sides of the driven shaft insertion hole 54 in the longitudinal direction in the axial direction. Further, the two rolling element releasing portions 57 are provided at positions separated by 180 ° in the rotational direction and opposed to each other in the radial direction. Both ends of each rolling element release portion 57 in the circumferential direction are composed of elastic portions 58 made of an elastic material such as a rubber material. Further, both ends of each rolling element releasing portion 57 in the circumferential direction extend linearly in parallel with the rotation axis of the driving side rotating body 42. Each of these rolling element releasing portions 57 is arranged inside the clutch housing 41.

As shown in FIGS. 2 and 3, the support member 43 holds the rolling element 44 between the clutch housing 41 facing in the radial direction and the driven side rotating body 45. The support member 43 of this embodiment is made of resin.

The support member 43 has a ring portion 61 forming an annular shape centered on the central axis L2 of the worm shaft 34. The outer diameter of the ring portion 61 is larger than the inner diameter of the clutch housing 41. The ring portion 61 is arranged on the motor portion 20 side (upper side in FIG. 2) with respect to the flange portion 41a of the clutch housing 41, and faces the flange portion 41a in the axial direction. The ring portion 61 is located between the flange portion 41a and the flange portion 52, and overlaps the flange portion 41a and the flange portion 52 in the axial direction.

The lower surface of the ring portion 61 (the end surface in the axial direction facing the flange portion 41a) has an annular ridge along the circumferential direction of the ring portion 61, and the first contact portion abuts on the flange portion 41a from the axial direction. The lower protrusion 61a is provided as a. Further, on the upper surface of the ring portion 61 (the end surface in the axial direction facing the flange portion 52), a plurality of upper protrusions 61b as second contact portions forming a substantially hemispherical shape protruding in the axial direction are provided. .. In the present embodiment, the upper protrusions 61b are provided at four positions separated in the circumferential direction. The tip of each upper protrusion 61b abuts axially from the output 30 side to the flange 52.

Further, at two locations on the inner peripheral side of the ring portion 61 that are separated in the circumferential direction (two locations that are 180 ° apart in the present embodiment), a rolling element holding that holds a columnar rolling element 44 extending in the axial direction is held. A portion 62 is formed.

Here, the rolling element 44 held by the rolling element holding portion 62 will be described in detail.
As shown in FIGS. 4A and 4B, each rolling element 44 is made of resin, and its central axis L3 is parallel to the central axis L1 of the rotating shaft 24 and the central axis L2 of the worm shaft 34. It is arranged to make an eggplant. Each rolling element 44 of the present embodiment has a width across flats when viewed from the axial direction. Therefore, each rolling element 44 has a shape having a longitudinal direction and a lateral direction when viewed from the axial direction. In the state shown in FIG. 4B, the radial direction of the clutch 40 is the longitudinal direction of the rolling element 44, and the circumferential direction of the clutch 40 is the lateral direction of the rolling element 44. Each of the rolling elements 44 has the first and second facing surfaces 71a which are planar on both sides of the rotating body 42 on the driving side in the rotational direction X1 (same as the circumferential direction of the clutch 40; hereinafter referred to as the rotational direction X1). , 71b. Further, each rolling element 44 has first and second arc surfaces 72a and 72b on both sides of the clutch 40 in the radial direction.

In each rolling element 44, the first and second facing surfaces 71a and 71b are parallel to the central axis L3 and parallel to each other. Further, in each rolling element 44, the first and second arcuate surfaces 72a and 72b form an arc shape having the central axis L3 as the center of curvature when viewed from the axial direction. In the present embodiment, the first arc surface 72a and the second arc surface 72b have the same curvature, but may have different curvatures. Further, the first and second arc surfaces 72a and 72b are formed parallel to the central axis L3 without being inclined.

As shown in FIG. 7A, in each rolling element 44, the first arcuate surface 72a located on the outer side in the radial direction faces the cylindrical inner peripheral surface 41c of the clutch housing 41 in the radial direction and is inside the same. It can come into contact with the peripheral surface 41c. On the other hand, in each rolling element 44, the second arcuate surface 72b located inside in the radial direction faces the driven side rotating body 45 in the radial direction and can come into contact with the driven side rotating body 45.

As shown in FIGS. 3, 4 (a) and 4 (b), each of the rolling element holding portions 62 has an axial support portion 63 extending radially inward from the ring portion 61. The axial support portion 63 faces the rolling element 44 in the axial direction. Further, each rolling element holding portion 62 is located on the opposite side of the ring portion 61 from both ends in the circumferential direction of the axial support portion 63 along the axial direction (central axis L1 and L2 directions) (downward in FIG. 4A). It has a pair of roller supports 64a and 64b extended to. In each rolling element holding portion 62, the paired roller supports 64a and 64b are located on both sides of the rolling element 44 in the rotation direction X1 and rotate the rolling element 44 so that the central axis L3 is parallel to the central axis L1. It is held from both sides of the direction X1. Regarding the roller supports 64a and 64b that form a pair of the rolling element holding portions 62, when the clutch 40 is viewed in the axial direction from the motor portion 20 side (that is, the state shown in FIG. 7A), the roller supports 64a are relative to the rolling element 44. The roller support located on the counterclockwise side is referred to as the first roller support 64a, and the roller support located on the clockwise side with respect to the rolling element 44 is referred to as the second roller support 64b.

Further, the support member 43 has a connecting portion 66 that connects the tip of the first roller support 64a of one rolling element holding portion 62 and the tip of the second roller support 64b of the other rolling element holding portion 62 to each other. .. The connecting portion 66 has an arc shape centered on the central axes L1 and L2 in the axial direction. Further, at the tip of each roller support 64a, 64b, a holding claw 67 protruding between the paired first and second roller supports 64a, 64b is provided. Each holding claw 67 abuts on one end surface of the rolling element 44 in the axial direction from the axial direction to prevent the rolling element 44 from falling off from the rolling element holding portion 62 in the axial direction.

Further, as shown in FIGS. 4A and 4B, in each rolling element holding portion 62, the paired roller supports 64a and 64b have first and second side surfaces facing each other in the rotation direction X1. The rolling element contact surfaces 68a and 68b of the above. The first rolling element contact surface 68a of the first roller support 64a has a planar shape parallel to the central axes L1 and L2, and the rolling elements 44 arranged between the paired roller supports 64a and 64b. It faces the first facing surface 71a of the above. Further, the second rolling element contact surface 68b provided on the second roller support 64b has a planar shape parallel to the central axes L1 and L2 like the first rolling element contact surface 68a. It faces the second facing surface 71b of the rolling elements 44 arranged between the paired roller supports 64a and 64b. The first and second rolling element contact surfaces 68a and 68b facing the rotation direction X1 are parallel to each other.

As shown in FIG. 4B, the distance between the first and second rolling element contact surfaces 68a and 68b facing each other in each rolling element holding portion 62 is the maximum outer diameter of each rolling element 44 (that is, that is). , The width in the longitudinal direction of the rolling element 44 in the axial view). Further, the distance between the first and second rolling element contact surfaces 68a and 68b facing each other in each rolling element holding portion 62 is the width of the rotation direction X1 in each rolling element 44 (with the first facing surface 71a). It is the length between the second facing surface 71b and slightly longer than the width of the rolling element 44 in the lateral direction in the axial direction).

Further, as shown in FIG. 4A, in each rolling element holding portion 62, the paired roller supports 64a and 64b are opposite to the first and second rolling element contact surfaces 68a and 68b facing each other. The first and second inclined surfaces 69a and 69b are provided on the side surface in the circumferential direction of the above. The first inclined surface 69a provided on the first roller support 64a is provided on the first roller support 64a between a position slightly closer to the tip than the base end of the first roller support 64a and the connecting portion 66. Has been done. The first inclined surface 69a is a planar shape inclined with respect to the rotation axis L4 direction of the support member 43 (the same as the rotation axis direction of the driving side rotating body 42, and the same as the central axis L1 direction in the present embodiment). Is doing. That is, the first inclined surface 69a is formed so as not to be parallel to the rotation axis L4 direction and not perpendicular to the rotation axis L4 direction. Specifically, the first inclined surface 69a is inclined so as to be separated from the first rolling element contact surface 68a from the base end side to the tip end side of the first roller support 64a. Therefore, the width of the first roller support 64a gradually increases in the circumferential direction (rotation direction of the support member 43 around the rotation axis of the drive side rotating body 42) from the base end side to the tip end side.

The second inclined surface 69b also has the same shape as the first inclined surface 69a. That is, the second inclined surface 69b provided on the second roller support 64b extends between the position of the second roller support 64b slightly closer to the tip than the base end of the second roller support 64b and the connecting portion 66. It is provided. The second inclined surface 69b is a planar shape inclined with respect to the rotation axis L4 direction of the support member 43 (the same as the rotation axis direction of the driving side rotating body 42 and the same as the central axis L1 direction in the present embodiment). Is doing. The second inclined surface 69b is inclined so as to be separated from the second rolling element contact surface 68b from the base end side to the tip end side of the second roller support 64b. Therefore, the width of the second roller support 64b gradually increases in the circumferential direction from the proximal end side to the distal end side.

Incidentally, the first inclined surface 69a and the second inclined surface 69b are inclined by, for example, about 10 ° with respect to the rotation axis L4 direction of the support member 43.
As shown in FIGS. 2 and 7A, by being held by the support member 43 having the above configuration, the two rolling elements 44 are spaced at equal angles (180 ° in this embodiment) in the rotation direction X1. Have been placed. Further, since the roller supports 64a and 64b holding the rolling elements 44 are inserted and arranged inside the clutch housing 41, each rolling element 44 is arranged inside the clutch housing 41 in the radial direction with the clutch housing 41. Facing. The support member 43 can rotate relative to the clutch housing 41 in the rotation direction X1.

Further, each rolling element releasing portion 57 of the driving side rotating body 42 is inserted inside the clutch housing 41 through the inner peripheral side of the ring portion 61 of the support member 43. Further, each rolling element releasing portion 57 is arranged between the two rolling element holding portions 62, and is adjacent to each rolling element holding portion 62 in the circumferential direction. Therefore, both ends (each elastic portion 58) of the rotation direction X1 in each rolling element releasing portion 57 are the first roller support 64a of one rolling element holding portion 62 and the second roller support 64b of the other rolling element holding portion 62. And each face the rotation direction X1. Specifically, one end of each rolling element release portion 57 in the rotation direction X1 faces the first inclined surface 69a of the first roller support 64a of the one rolling element holding portion 62 and the rotation direction X1. The other end of the rolling element releasing portion 57 in the rotational direction X1 faces the second inclined surface 69b of the second roller support 64b of the other rolling element holding portion 62 in the rotational direction X1. The support member 43 and the drive-side rotating body 42 can rotate relative to each other in the rotation direction X1, and when the drive-side rotating body 42 rotates, each rolling element releasing portion 57 is located on the front side in the rotation direction. The first inclined surface 69a of the roller support 64a or the second inclined surface 69b of the second roller support 64b is brought into contact with the second inclined surface 69b of the second roller support 64b from the rotation direction of the driving side rotating body 42.

As shown in FIGS. 2 and 3, the driven side rotating body 45 is integrally formed with a base end portion (upper end portion in FIG. 2) of the worm shaft 34, and is made of metal. The driven side rotating body 45 includes a control unit 81 and a driven side connecting unit 82 arranged side by side in the axial direction. The driven side connecting unit 82 is provided on the base end side (upper side in FIG. 2) of the control unit 81.

The control unit 81 is integrally formed with the worm shaft 34 and has a columnar shape extending in the axial direction of the worm shaft 34. The central axis of the control unit 81 coincides with the central axis L2 of the worm shaft 34, and is formed coaxially with the worm shaft 34. Further, as shown in FIG. 7A, when viewed from the central axis L2 direction, the control unit 81 has a point-symmetrical shape with the central axis L2 of the worm axis 34 as the center of symmetry.

A pair of control surfaces 83 are formed on the outer peripheral surface of the control unit 81. Each control surface 83 is formed at two locations on the outer peripheral surface of the control unit 81 at equal angular intervals (180 ° intervals in the present embodiment) in the circumferential direction. Each control surface 83 has a planar shape parallel to the axial direction and orthogonal to the radial direction of the driven side rotating body 45. Further, the pair of control surfaces 83 are parallel to each other, and the axial length of each control surface 83 is longer than the axial length of the rolling element 44.

As shown in FIGS. 2 and 7B, the driven side connecting portion 82 has a columnar shape extending in the axial direction of the worm shaft 34. The central axis of the driven side connecting portion 82 coincides with the central axis L2 of the worm shaft 34, and is formed coaxially with the worm shaft 34. Further, the driven side connecting portion 82 is formed to be slightly thinner than the driven shaft insertion hole 54. The driven side connecting portion 82 has a substantially elliptical cross-sectional shape orthogonal to the axial direction, and the cross-sectional shape is constant in the axial direction. Further, in the axial direction, the longitudinal direction of the driven side connecting portion 82 is a direction parallel to the control surface 83, and the lateral direction of the driven side connecting portion 82 is a direction orthogonal to the control surface 83. (See also FIG. 7 (a)). As shown in FIG. 7B, when viewed from the central axis L2 direction, the driven side connecting portion 82 has a point-symmetrical shape with the central axis L2 of the worm shaft 34 as the center of symmetry.

A pair of first driven side transmission surfaces 84 and a pair of second driven side transmission surfaces 85 are formed on the outer peripheral surface of the driven side connecting portion 82. Of the two paired first driven side transmitting surfaces 84, one of the first driven side transmitting surfaces 84 is formed 180 ° opposite to the other first driven side transmitting surface 84. The two first driven side transmission surfaces 84 have a planar shape parallel to the axial direction and are parallel to each other. Further, the distance between the two first driven side transmission surfaces 84 is formed to be equal to the distance between the pair of drive side transmission surfaces 54a provided in the driven shaft insertion hole 54 of the drive side rotating body 42.

The second driven side transmission surface 85 is formed between the two first driven side transmission surfaces 84, and one second driven side transmission surface 85 is relative to the other second driven side transmission surface 85. It is formed on the opposite side by 180 °. The two second driven side transmission surfaces 85 each have a planar shape parallel to the axial direction and are parallel to each other. Further, the distance between the two second driven side transmission surfaces 85 is formed to be equal to the distance between the pair of drive side transmission surfaces 54a provided in the driven shaft insertion hole 54 of the drive side rotating body 42. The first driven side transmission surface 84 and the second driven side transmission surface 85 are formed in the axial direction from one end to the other end in the axial direction of the driven side connecting portion 82.

As shown in FIG. 2, the driven-side rotating body 45 as described above is inserted inside the clutch housing 41 and the support member 43 from the side opposite to the driving-side rotating body 42. The driven-side rotating body 45 is arranged coaxially with the clutch housing 41, the driving-side rotating body 42, and the support member 43.

Further, as shown in FIG. 7B, the driven side connecting portion 82 is loosely fitted in the driven shaft insertion hole 54 which can rotate integrally with the driving side rotating body 42. The first and second elastic members 55 and 56 are interposed between the outer peripheral surface of the driven side connecting portion 82 loosely fitted in the driven shaft insertion hole 54 and the inner peripheral surface of the driven shaft insertion hole 54. Specifically, the pair of second elastic members 56 are in contact with both ends in the longitudinal direction of the driven side connecting portion 82 in the axial direction. Further, the four first elastic members 55 are interposed between the two first driven side transmission surfaces 84 and the two second driven side transmission surfaces 85 and the drive side transmission surface 54a, respectively.

Then, when the drive-side rotating body 42 rotates about the central axis with respect to the driven-side rotating body 45, the driving-side transmitting surface 54a elastically deforms the first elastic member 55 while elastically deforming the first and second driven-side transmitting surfaces. It abuts in the direction of rotation with respect to either 84 or 85. As a result, the driving side rotating body 42 and the driven side rotating body 45 are engaged in the rotational direction, and the rotational driving force of the driving side rotating body 42 is transmitted to the driven side rotating body 45.

Further, as shown in FIG. 7A, in the control unit 81 of the driven side rotating body 45, the rolling element 44 is interposed between each control surface 83 and the inner peripheral surface 41c of the clutch housing 41, respectively. It is inserted inside the support member 43 and faces the clutch housing 41 and each rolling element 44 in the radial direction. That is, the support member 43 holds the rolling element 44 between the inner peripheral surface 41c of the clutch housing 41 and each control surface 83 of the driven side rotating body 45.

Then, the distance (distance in the direction orthogonal to the control surface 83) between each control surface 83 and the inner peripheral surface 41c of the clutch housing 41 changes in the rotation direction of the driven side rotating body 45. In the present embodiment, the distance between the control surface 83 and the inner peripheral surface 41c of the clutch housing 41 is the longest at the center of the circumferential direction of each control surface 83, and is from the center of the circumferential direction of each control surface 83 to the circumferential direction. It gradually shortens toward both ends. Further, the distance between the center of each control surface 83 in the circumferential direction and the inner peripheral surface 41c of the clutch housing 41 is longer than the maximum outer diameter of the rolling element 44, and is equal to the circumferential end of each control surface 83. The distance between the inner peripheral surface 41c of the clutch housing 41 is shorter than the maximum outer diameter of the rolling element 44.

Next, the operation of the motor 10 configured as described above will be described together with the operation of the clutch 40, focusing on the operation.
As shown in FIGS. 2 and 8A, when the motor unit 20 is driven by energizing the motor unit 20, the drive-side rotating body 42 rotates together with the rotating shaft 24. That is, the rotational drive of the drive-side rotating body 42 is started. 8 (a) and 8 (b) show a case where the drive-side rotating body 42 is rotationally driven in the first direction R1. Then, as shown in FIG. 8A, with the rotation of the driving side rotating body 42 in the first direction R1, the circumferential direction of each rolling element releasing portion 57 of the driving side rotating body 42 on the front side in the rotational direction. The end portion (elastic portion 58) comes into contact with the first inclined surface 69a of the first roller support 64a of each rolling element holding portion 62 in the rotational direction.

Here, as shown in FIGS. 5 and 6, the circumferential end of each rolling element releasing portion 57 extends parallel to the rotation axis of the driving side rotating body 42, while each first inclined surface 69a is formed. The support member 43 is inclined with respect to the rotation axis L4 direction (same as the rotation axis direction of the driving side rotating body 42). Therefore, when the rolling element releasing portion 57 abuts on the first inclined surface 69a in the rotation direction of the driving side rotating body 42 at the start of the rotational driving of the driving side rotating body 42, the driving side rotating body 69a on the first inclined surface 69a. A component force F1a (see FIG. 6) in the direction of the rotation axis L4 of the support member 43 is generated from the pressing force F by 42. By this component force F1a, the support member 43 is pressed toward the clutch housing 41 that overlaps in the rotation axis L4 direction. Therefore, since the lower protrusion 61a of the ring portion 61 is pressed axially against the flange portion 41a of the clutch housing 41, the frictional force between the lower protrusion 61a and the flange portion 41a is increased. That is, the first inclined surface 69a acts to increase the frictional force between the lower protrusion 61a and the flange portion 41a. Then, the support member 43 becomes difficult to rotate around the rotation axis of the drive-side rotating body 42 due to the frictional force between the lower protrusion 61a and the flange portion 41a. Therefore, at the start of the rotational drive of the drive-side rotating body 42, the support member 43 is subjected to the impact when the rolling element releasing portion 57 comes into contact with the first roller support 64a from the rotation direction of the driving-side rotating body 42, and the support member 43 is driven. It is suppressed from being skipped in the rotation direction of 42 (first direction R1 in the example shown in FIG. 7) and rotating ahead of the driving side rotating body 42. Therefore, after the rolling element releasing portion 57 comes into contact with the first roller support 64a from the rotation direction of the driving side rotating body 42, the driving side rotating body 42 and the support member 43 tend to rotate integrally. Then, each rolling element releasing portion 57, which is in contact with the first roller support 64a of each rolling element holding portion 62 in the rotational direction, is subjected to each of the rolling element releasing portions 57 via the first roller support 64a by the circumferential component force F1b of the pressing force F. By pressing the rolling element 44 in the first direction R1, the sandwiching of each rolling element 44 by the inner peripheral surface 41c of the clutch housing 41 and the control surface 83 of the driven side rotating body 45 is released.

Further, as shown in FIG. 8B, in the drive-side rotating body 42, each drive-side transmission surface 54a abuts on each second driven-side transmission surface 85 of the driven-side connecting portion 82 from the first direction R1. Then, it is integrally rotatably connected to the driven side rotating body 45.

The support member 43 is pressed by the driving side rotating body 42 in the rotational direction of the driving side rotating body 42, so that the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 are released from sandwiching the rolling body 44. After that, the driven-side rotating body 45 may try to hold the rolling body 44 again with the inner peripheral surface 41c of the clutch housing 41 (see FIG. 8A). However, in the present embodiment, the support member 43 is prevented from rotating ahead of the drive-side rotating body 42, so that the drive-side rotating body 42 and the support member 43 can easily rotate integrally. .. Therefore, when the driving side rotating body 42 and the support member 43 rotate integrally, the sandwiching of the rolling body 44 by the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 is immediately released.

Then, while each rolling element releasing portion 57 presses the first roller support 64a and the rolling element 44 in the first direction R1 and the driving side rotating body 42 and the support member 43 rotate integrally, each rolling element 44 is arranged at the central portion of each control surface 83 in the circumferential direction. That is, the rolling element 44 is not sandwiched between the control surface 83 and the clutch housing 41 (that is, it does not interfere with the rotation of the driven side rotating body 45), and is in an unlocked state. In this unlocked state, the rotational driving force of the driving side rotating body 42 (rotating shaft 24) is transmitted to the driven side rotating body 45 (worm shaft 34), and the rotating shaft 24 and the worm shaft 34 move to the first direction R1. It rotates integrally, and the rotation of the worm shaft 34 in the first direction R1 is transmitted to the output shaft 38 while being decelerated with the worm wheel 37, and is output from the output shaft 38. Then, the wind glass of the vehicle is moved up and down via a wind regulator (not shown) according to the rotation direction of the output shaft 38. Then, when the energization of the motor unit 20 is stopped, the rotational drive of the rotating shaft 24, that is, the rotational drive of the driving side rotating body 42 is stopped.

Incidentally, when the drive-side rotating body 42 is rotated in the second direction R2 by the drive of the motor unit 20, the clutch 40 has the opposite rotation directions of the members, but the drive-side rotating body 42 described above. The rotating shaft 24 and the worm shaft 34 are connected in the same operation as when is rotated in the first direction R1.

As shown in FIGS. 9A and 9B, when the driving of the motor unit 20 is stopped, that is, when the rotating shaft 24 (driving side rotating body 42) is driven non-rotatingly, the load side (the present embodiment). Then, when a load is applied to the output shaft 38 from the window regulator side), the driven side rotating body 45 tries to rotate due to the load. Note that FIGS. 9 (a) and 9 (b) show a case where the driven side rotating body 45 tries to rotate in the second direction R2. Then, each control surface 83 of the driven side rotating body 45 presses the rolling body 44 arranged between each control surface 83 and the inner peripheral surface 41c of the clutch housing 41 toward the outer peripheral side. In the rolling element 44 pushed by the control surface 83, the first arc surface 72a abuts on the inner peripheral surface 41c of the clutch housing 41 between the pair of roller supports 64a and 64b, and the control surface on the control surface 83. The second arc surface 72b abuts on a portion closer to the end portion in the circumferential direction (the end portion on the control surface 83 on the rear side of the second direction R2) than the center in the circumferential direction of the 83. Then, each rolling element 44 is sandwiched between a portion of the control surface 83 near the rear end of the second direction R2 and the inner peripheral surface 41c of the clutch housing 41. As a result, the rolling element 44 becomes a wedge, and the rotation of the driven side rotating body 45 (rotation in the second direction R2) is blocked (that is, the rotation of the worm shaft 34 is locked). Therefore, it is prevented that the output shaft 38 is rotated during the non-rotational drive of the rotating shaft 24 (driving side rotating body 42). In the state where the driven side rotating body 45 is arranged at the locked position (the position where the rolling body 44 is sandwiched between the driven side rotating body 45 and the clutch housing 41) (the state shown in FIG. 9A), it is shown in FIG. 9B. As described above, each of the second driven side transmission surfaces 85 of the driven side connecting portion 82 does not come into contact with each of the driving side transmitting surfaces 54a of the driving side rotating body 42 in the rotation direction (second direction R2).

Incidentally, even when the driven side rotating body 45 tries to rotate in the first direction R1 when the motor unit 20 (driving side rotating body 42) is not driven, the rotation of the driven side rotating body 45 is similarly prevented. To. That is, each rolling element 44 is sandwiched between the portion of the control surface 83 near the rear end of the first direction R1 and the inner peripheral surface 41c of the clutch housing 41, so that each rolling element 44 is sandwiched between the rolling elements 44. As a wedge, the rotation of the driven side rotating body 45 (rotation in the first direction R1) is blocked (that is, the rotation of the worm shaft 34 is locked).

Next, the effect of this embodiment will be described.
(1) Since it is possible to prevent the drive-side rotating body 42 from repeatedly separating or coming into contact with the support member 43 from the rotation direction of the driving-side rotating body 42 at the start of rotational driving of the driving-side rotating body 42, the driving side rotating body 42 can be driven. It is possible to suppress the generation of noise at the start of the rotational drive of the side rotating body 42. Since the motor 10 includes a clutch 40 in which the generation of noise at the start of the rotational drive of the drive-side rotating body 42 is suppressed, noise is generated in the motor 10 at the start of the rotational drive of the rotating shaft 24. Is suppressed.

(2) The support member 43 has a lower protrusion 61a that abuts on the flange portion 41a of the clutch housing 41. Then, the first and second inclined surfaces 69a and 69b act to increase the frictional force between the lower protrusion 61a and the flange portion 41a at the start of the rotational drive of the driving side rotating body 42. In this way, the frictional force between the lower protrusion 61a and the flange portion 41a is increased by the first and second inclined surfaces 69a and 69b, and the support member 43 is driven by the driving side rotating body due to the frictional force. It becomes difficult to rotate around the rotation axis of 42. Therefore, it is possible to easily prevent the support member 43 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42 by the frictional force. it can. As a result, the generation of noise at the start of the rotational drive of the drive-side rotating body 42 can be easily suppressed.

(3) The first and second inclined surfaces 69a and 69b have a pressing force (that is, a component force F1a) that presses the support member 43 toward the clutch housing 41 so that the lower protrusion 61a is pressed against the flange portion 41a. To generate. Therefore, the lower protrusion 61a is pressed against the flange 41a by the component force F1a generated by the first and second inclined surfaces 69a and 69b, so that the frictional force between the lower protrusion 61a and the flange 41a Is easily increased. Then, the frictional force makes it difficult for the support member 43 to rotate around the rotation axis of the drive-side rotating body 42. Therefore, it is possible to more easily prevent the support member 43 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

(4) The support member 43 has a portion that overlaps with the clutch housing 41 in the rotation axis L4 direction of the support member 43. Further, the first and second inclined surfaces 69a and 69b of the support member 43 are inclined with respect to the rotation axis L4 direction of the support member 43. Therefore, when the driving side rotating body 42 comes into contact with the first inclined surface 69a or the second inclined surface 69b from the rotation direction at the start of the rotational driving of the driving side rotating body 42, the driving side rotating body 42 causes the driving side rotating body 42 to come into contact with the first inclined surface 69a or the second inclined surface 69b. A component force F1a in the direction of the rotation axis L4 is generated from the pressing force F. By this component force F1a, the support member 43 is pressed toward the clutch housing 41 that overlaps the support member 43 in the direction of the rotation axis L4. As a result, it is possible to more easily prevent the support member 43 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

<Second Embodiment>
Hereinafter, a second embodiment of the motor including the clutch will be described. In this embodiment, the same configurations as those of the first embodiment and the corresponding configurations are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 10, the clutch 100 of the present embodiment is provided in the motor 10 in place of the clutch 40 of the first embodiment. In the clutch 40 of the first embodiment, the clutch 100 includes a drive-side rotating body 110 instead of the driving-side rotating body 42, and also includes a support member 120 instead of the support member 43.

The support member 120 is configured to include first and second inclined surfaces 121a and 121b in place of the first and second inclined surfaces 69a and 69b in the support member 43 of the first embodiment. ..

In each rolling element holding portion 62, the first inclined surface 121a provided on the first roller support 64a side is a side surface of the axial support portion 63 in the circumferential direction (right side in FIG. 10) and the first roller. The support 64a is provided over the side surface in the circumferential direction opposite to the rolling element 44. Further, in each rolling element holding portion 62, the first inclined surface 121a extends from the axial base end of the axial support portion 63 to the front side of the connecting portion 66 on the tip end side of the first roller support 64a. It is provided. The first inclined surface 121a is inclined with respect to the rotation axis L6 direction of the support member 120 (the same as the rotation axis L5 direction of the driving side rotating body 110, and the same as the central axis L1 direction in the present embodiment). It has a flat shape. That is, the first inclined surface 121a is formed so as not to be parallel to the rotation axis L6 direction and not perpendicular to the rotation axis L6 direction. Specifically, the first inclined surface 121a is inclined so as to approach the first rolling element contact surface 68a from the axial base end of the axial support portion 63 toward the tip end side of the first roller support 64a. There is. Therefore, the width of the first roller support 64a in the circumferential direction (rotation direction of the support member 120 around the rotation axis L5 of the drive side rotating body 110) gradually narrows from the base end side to the tip end side.

The second inclined surface 121b also has the same shape as the first inclined surface 121a. That is, in each rolling element holding portion 62, the second inclined surface 121b provided on the second roller support 64b side is the side surface on one side (left side in FIG. 10) in the circumferential direction of the axial support portion 63, and the second The two roller supports 64b are provided over the side surface in the circumferential direction opposite to the rolling element 44. Further, in each rolling element holding portion 62, the second inclined surface 121b extends from the axial base end of the axial support portion 63 to the front side of the connecting portion 66 on the tip end side of the second roller support 64b. It is provided. Further, the second inclined surface 121b has a planar shape inclined with respect to the rotation axis L6 direction of the support member 120. Specifically, the second inclined surface 121b is inclined so as to approach the second rolling element contact surface 68b from the axial base end of the axial support portion 63 toward the tip end side of the second roller support 64b. There is. Therefore, the width of the second roller support 64b in the circumferential direction gradually narrows from the base end side toward the tip end side, and the rolling element holding portion 62 in the circumferential direction toward the tip end side in the axial direction. The width of is gradually narrowing.

The drive-side rotating body 110 has a configuration in which the driving-side rotating body 42 of the first embodiment includes first and second driving-side inclined surfaces 111a and 111b in each rolling element releasing portion 57.
The first inclined surface 111a on the driving side is the first inclined surface 121a and the rotating body on the driving side provided in the rolling element holding portion 62 of one of the two rolling body holding portions 62 in the rolling element releasing portion 57. It is provided on the side surface of the 110 facing the rotation direction. Further, the first drive-side inclined surface 111a is provided from the base end to the tip end of the rolling element releasing portion 57. The first drive-side inclined surface 111a is inclined with respect to the rotation axis L5 direction of the drive-side rotating body 110. That is, the first drive-side inclined surface 111a is formed so as not to be parallel to the rotation axis L5 direction and not perpendicular to the rotation axis L5 direction. Specifically, assuming that a straight line extending in the rotation axis L5 direction through the center of the rolling element releasing portion 57 in the circumferential direction is the center line of the rolling element releasing portion 57, the first drive-side inclined surface 111a is the rolling element releasing portion 57. It is inclined so as to move away from the center line of the rolling element release portion 57 in the circumferential direction toward the tip end of the rolling element. Therefore, one end of the rolling element releasing portion 57 in the circumferential direction gradually protrudes in the circumferential direction (rotating direction of the driving side rotating body 110) from the base end to the tip of the rolling element releasing portion 57. .. The first driven-side inclined surface 111a can come into surface contact with the first inclined surface 121a facing the driving-side rotating body 110 in the rotating direction from the rotating direction of the driving-side rotating body 110.

The second drive-side inclined surface 111b also has the same shape as the first drive-side inclined surface 111a. That is, the second driven side inclined surface 111b is the second inclined surface 121b and the drive side provided in the rolling body holding portion 62 of either one of the two rolling body holding portions 62 in the rolling body releasing portion 57. It is provided on the side surface of the rotating body 110 facing the rotation direction. Further, the second drive-side inclined surface 111b is provided from the base end to the tip end of the rolling element releasing portion 57. The second drive-side inclined surface 111b is inclined with respect to the rotation axis L5 direction of the drive-side rotating body 110. Specifically, the second drive-side inclined surface 111b is inclined so as to move away from the center line of the rolling element releasing portion 57 in the circumferential direction from the base end to the tip of the rolling element releasing portion 57. Therefore, the other end of the rolling element releasing portion 57 in the circumferential direction gradually protrudes in the circumferential direction (rotating direction of the driving side rotating body 110) from the base end to the tip of the rolling element releasing portion 57. The rolling element releasing portion 57 has a shape in which the width in the circumferential direction gradually increases from the base end to the tip end. The second driven-side inclined surface 111b can come into surface contact with the second inclined surface 121b facing the drive-side rotating body 110 in the rotating direction from the rotating direction of the driving-side rotating body 110.

Next, the operation of this embodiment will be described.
When the rotary drive of the rotary shaft 24 is started by the drive of the motor unit 20, the rotary drive of the drive-side rotating body 110 that rotates integrally with the rotary shaft 24 is started. As the driving side rotating body 110 rotates, the circumferential end portion of each rolling body releasing portion 57 of the driving side rotating body 110 on the front side in the rotating direction abuts on each rolling body holding portion 62 in the rotating direction (FIG. FIG. 8 (a)). That is, depending on the rotation direction of the drive-side rotating body 110, the first drive-side inclined surface 111a comes into surface contact with the first inclined surface 121a, or the second driving-side inclined surface 111b comes into contact with the second inclined surface 121b. Face contact.

Here, in FIG. 10, the drive-side rotating body 110 rotates in the first direction R1, and the first drive-side inclined surface 111a comes into surface contact with the first inclined surface 121a from the rotation direction of the drive-side rotating body 110. The case is shown in the figure. Both the first inclined surface 121a and the first driving side inclined surface 111a are inclined in the same direction with respect to the rotation axis L5 direction of the drive side rotating body 110 (the same as the rotation axis L6 direction of the support member 120). There is. Therefore, when the first drive-side inclined surface 111a abuts on the first inclined surface 121a from the rotation direction of the driving-side rotating body 110 at the start of the rotational drive of the driving-side rotating body 110, the driving is driven on the first inclined surface 121a. A component force F2a in the direction of the rotation axis L6 of the support member 120 is generated from the pressing force F by the side rotating body 110. By this component force F2a, the support member 120 is pressed toward the drive-side rotating body 110 that overlaps the support member 120 in the direction of the rotation axis L6. Therefore, since the upper protrusion 61b of the ring portion 61 is pressed against the flange portion 52 in the axial direction, the frictional force between the upper protrusion 61b and the collar portion 52 is increased. That is, the first inclined surface 121a acts to increase the frictional force between the upper protrusion 61b and the flange 52. Then, the support member 120 becomes difficult to rotate around the rotation axis of the drive-side rotating body 110 due to the frictional force between the upper protrusion 61b and the flange portion 52. Therefore, at the start of the rotational drive of the drive-side rotating body 110, the support member 120 is subjected to the impact when the rolling element releasing portion 57 comes into contact with the rolling element holding portion 62 from the rotating direction of the driving-side rotating body 110, and the support member 120 is driven. It is suppressed that it is blown in the rotation direction of 110 and rotates ahead of the driving side rotating body 110. Therefore, after the rolling element releasing portion 57 abuts on the rolling element holding portion 62 from the rotation direction of the driving side rotating body 110, the driving side rotating body 110 and the support member 120 tend to rotate integrally. Then, each rolling element releasing portion 57 that comes into contact with each rolling element holding portion 62 in the rotational direction rotates the rolling element 44 on the drive side via each rolling element holding portion 62 by the component force F2b in the circumferential direction of the pressing force F. By pressing in the rotational direction of the body 110, the sandwiching of each rolling element 44 by the inner peripheral surface 41c of the clutch housing 41 and the control surface 83 of the driven side rotating body 45 is released.

The support member 120 is pressed by the driving side rotating body 110 in the rotation direction of the driving side rotating body 110, so that the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 are released from sandwiching the rolling body 44. After that, the driven side rotating body 45 may try to sandwich the rolling body 44 again with the inner peripheral surface 41c of the clutch housing 41. However, in the present embodiment, the support member 120 is prevented from rotating ahead of the drive-side rotating body 110, so that the drive-side rotating body 110 and the support member 120 can easily rotate integrally. .. Therefore, when the driving side rotating body 110 and the support member 120 rotate integrally, the sandwiching of the rolling body 44 by the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 is immediately released.

The same effect can be obtained when the second drive-side inclined surface 111b comes into surface contact with the second inclined surface 121b from the rotation direction of the drive-side rotating body 110 at the start of the rotational drive of the drive-side rotating body 110.

According to the present embodiment, in addition to the same effect as (1) of the first embodiment, the following effects can be obtained.
(1) The support member 120 has an upper protrusion 61b that abuts on the flange 52 of the drive-side rotating body 110. Then, the first and second inclined surfaces 121a and 121b act to increase the frictional force between the upper protrusion 61b and the flange portion 52 at the start of the rotational drive of the driving side rotating body 110. In this way, the first and second inclined surfaces 121a and 121b increase the frictional force between the upper protrusion 61b and the flange portion 52, and the frictional force causes the support member 120 to move the drive-side rotating body 110. It becomes difficult to rotate around the axis of rotation of. Therefore, it is possible to easily prevent the support member 120 from rotating in the rotation direction of the drive-side rotating body 110 ahead of the driving-side rotating body 110 at the start of the rotational driving of the driving-side rotating body 110 by the frictional force. it can. As a result, it is possible to easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 110.

(2) The first and second inclined surfaces 121a and 121b have a pressing force (that is, a component force F2a) that presses the support member 120 toward the driving side rotating body 110 so that the upper protrusion 61b is pressed against the flange portion 52. ) Is generated. Therefore, the upper protrusion 61b is pressed against the flange 52 by the component force F2a generated by the first and second inclined surfaces 121a and 121b, so that the frictional force between the upper protrusion 61b and the flange 52 is easy. Is increased to. Then, this frictional force makes it difficult for the support member 120 to rotate around the rotation axis L5 of the drive-side rotating body 110. Therefore, it is possible to more easily prevent the support member 120 from rotating in the rotation direction of the drive-side rotating body 110 ahead of the driving-side rotating body 110 at the start of the rotational driving of the driving-side rotating body 110. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 110.

(3) The support member 120 has a portion that overlaps with the drive-side rotating body 110 in the rotation axis L6 direction of the support member 120. Further, the first and second inclined surfaces 121a and 121b of the support member 120 are inclined with respect to the rotation axis L6 direction of the support member 120. Therefore, when the driving side rotating body 110 comes into contact with the first inclined surface 121a or the second inclined surface 121b from the rotation direction at the start of the rotational driving of the driving side rotating body 110, the driving side rotating body 110 causes the driving side rotating body 110 to come into contact with the first inclined surface 121a or the second inclined surface 121b. A component force F2a in the direction of the rotation axis L6 of the support member 120 is generated from the pressing force F. By this component force F2a, the support member 120 is pressed toward the drive-side rotating body 110 that overlaps the support member 120 in the direction of the rotation axis L6. As a result, it is possible to more easily prevent the support member 120 from rotating in the rotation direction of the drive-side rotating body 110 ahead of the driving-side rotating body 110 at the start of the rotational driving of the driving-side rotating body 110. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 110.

(4) The drive-side rotating body 110 has first and second drive-side inclined surfaces 111a and 111b that are inclined with respect to the rotation axis L5 direction of the driving-side rotating body 110. Then, at the start of the rotational drive of the drive-side rotating body 110, the first and second drive-side inclined surfaces 111a and 111b are moved to the first and second inclined surfaces 121a and 121b from the rotation direction of the drive-side rotating body 110. Face contact. Therefore, when the first and second inclined surfaces 111a and 111b come into contact with the first and second inclined surfaces 121a and 121b, the rotating axis L6 of the support member 120 is affected by the pressing force of the driving side rotating body 110. The component force in the direction can be stably and easily generated. Then, by this component force, the support member 120 is pressed toward the drive-side rotating body 110 that overlaps the support member 120 in the direction of the rotation axis L6. Therefore, it is possible to more effectively prevent the support member 120 from rotating in the rotation direction of the drive-side rotating body 110 ahead of the driving-side rotating body 110 at the start of the rotational driving of the driving-side rotating body 110. As a result, it is possible to more effectively suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 110.

<Third Embodiment>
Hereinafter, a third embodiment of the motor provided with the clutch will be described. In this embodiment, the same configurations as those of the first embodiment and the corresponding configurations are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 11, the clutch 130 of the present embodiment is provided in the motor 10 in place of the clutch 40 of the first embodiment. The clutch 130 has a configuration in which the support member 140 is provided in place of the support member 43 in the clutch 40 of the first embodiment. The support member 140 is configured to include the urging portion 141 in the support member 43 of the first embodiment. The support member 140 does not include the first and second inclined surfaces 69a and 69b of the first embodiment, and the first and second roller supports 64a and 64b are the rotation axes of the drive-side rotating body 42. The width in the circumferential direction (rotational direction of the driving side rotating body 42) is constant along the direction.

As shown in FIGS. 11 and 12, the urging portion 141 is integrally provided at the central portion of each connecting portion 66 in the circumferential direction (rotational direction of the support member 140). In each connecting portion 66, the urging portion 141 has an extending portion 141a extending from the connecting portion 66 toward the ring portion 61 along the rotation axis L7 direction of the support member 140, and the extending portion 141a from the tip end portion to the outer peripheral side. It has a protruding pressing portion 141b.

The extending portion 141a can be elastically deformed so that the position of the tip portion thereof changes in the radial direction with respect to the base end portion thereof. In the state before the support member 140 is inserted into the clutch housing 41 (that is, the state shown in FIG. 12), the radial outer side surface of the extending portion 141a is flush with the outer peripheral surface of the connecting portion 66. There is.

The pressing portion 141b projects radially outward from the outer peripheral surface of the connecting portion 66. The sliding contact surface 141c, which is the tip surface (side surface facing outward in the radial direction) of the pressing portion 141b, has an arc shape bulging toward the outer peripheral side when viewed from the rotation axis L7 direction of the support member 140. The sliding contact surface 141c is curved with the same curvature as the inner peripheral surface 41c of the clutch housing 41, for example. Then, in the state before the support member 140 is inserted inside the clutch housing 41, the sliding contact surface 141c is located radially outside the outer peripheral surface of the connecting portion 66. Further, in the same state, the diameter of the circle (not shown) inscribed by the sliding contact surfaces 141c of the two urging portions 141 is larger than the inner diameter of the clutch housing 41 when viewed from the rotation axis L7 direction.

As shown in FIG. 11, such a support member 140 is inserted inside the clutch housing 41 in a state where the extending portion 141a of each urging portion 141 is elastically deformed inward in the radial direction. The sliding contact surface 141c of each urging portion 141 is pressed against the inner peripheral surface 41c of the clutch housing 41 by the elastic force of the extending portion 141a. That is, the support member 140 presses the pressing portion 141b toward the inner peripheral surface 41c of the clutch housing 41 so that the sliding contact surface 141c that abuts on the inner peripheral surface 41c of the clutch housing 41 is pressed against the inner peripheral surface 41c. It has an urging portion 141 (extending portion 141a) that generates a pressing force. The sliding contact surface 141c is in press contact with the inner peripheral surface 41c of the clutch housing 41 so as to be in sliding contact in the rotational direction of the support member 140, and the support member 140 is between the inner peripheral surface 41c and the sliding contact surface 141c. A frictional force (load) is generated that makes it difficult to rotate around the rotation axis of the drive-side rotating body 42. That is, the extending portion 141a of the urging portion 141 acts to increase the frictional force between the inner peripheral surface 41c of the clutch housing 41 and the pressing portion 141b.

Next, the operation of this embodiment will be described.
When the rotary drive of the rotary shaft 24 is started by the drive of the motor unit 20, the rotary drive of the drive-side rotating body 42 that rotates integrally with the rotary shaft 24 is started. As the driving side rotating body 42 rotates, the circumferential end portion of each rolling body releasing portion 57 of the driving side rotating body 42 on the front side in the rotating direction comes into contact with each rolling body holding portion 62 in the rotating direction (FIG. 8 (a)).

At this time, the support member 140 is difficult to rotate around the rotation axis of the drive-side rotating body 42 due to the frictional force between the inner peripheral surface 41c of the clutch housing 41 and the sliding contact surface 141c. Therefore, at the start of the rotational drive of the drive-side rotating body 42, the support member 140 is subjected to the impact when the rolling element releasing portion 57 comes into contact with the rolling element holding portion 62 from the rotating direction of the driving-side rotating body 42, and the support member 140 is driven. It is suppressed that it is blown in the rotation direction of 42 and rotates ahead of the driving side rotating body 42. Therefore, after the rolling element releasing portion 57 abuts on the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42, the driving side rotating body 42 and the support member 140 tend to rotate integrally. Then, each rolling element releasing portion 57 that comes into contact with each rolling element holding portion 62 in the rotational direction presses the rolling element 44 in the rotational direction of the driving side rotating body 42 via each rolling element holding portion 62. The sandwiching of each rolling element 44 by the inner peripheral surface 41c of the clutch housing 41 and the control surface 83 of the driven side rotating body 45 is released.

The support member 140 is pressed by the driving side rotating body 42 in the rotational direction of the driving side rotating body 42, so that the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 are released from sandwiching the rolling body 44. After that, the driven-side rotating body 45 may try to sandwich the rolling body 44 again with the inner peripheral surface 41c of the clutch housing 41. However, in the present embodiment, the support member 140 is prevented from rotating ahead of the drive-side rotating body 42, so that the drive-side rotating body 42 and the support member 140 can easily rotate integrally. .. Therefore, when the driving side rotating body 42 and the support member 140 rotate integrally, the sandwiching of the rolling body 44 by the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 is immediately released.

According to the present embodiment, in addition to the same effect as (1) of the first embodiment, the following effects can be obtained.
(1) The support member 140 has a pressing portion 141b that abuts and slides on the inner peripheral surface 41c of the clutch housing 41. Then, the extending portion 141a of the urging portion 141 acts to increase the frictional force between the pressing portion 141b and the inner peripheral surface 41c of the clutch housing 41. In this way, the extension portion 141a increases the frictional force between the pressing portion 141b and the inner peripheral surface 41c of the clutch housing 41, and the frictional force causes the support member 140 to move the rotation axis of the drive-side rotating body 42. It becomes difficult to rotate around. Therefore, it is possible to easily prevent the support member 140 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42 by the frictional force. it can. As a result, it is possible to easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

(2) The support member 140 directs the pressing portion 141b toward the inner peripheral surface 41c of the clutch housing 41 so that the sliding contact surface 141c that abuts on the inner peripheral surface 41c of the clutch housing 41 is pressed against the inner peripheral surface 41c. It has an urging portion 141 that generates a pressing force to be pressed. In this way, the pressing portion 141b is pressed against the inner peripheral surface 41c of the clutch housing 41 by the pressing force generated by the urging portion 141, so that the pressing portion 141b (sliding contact surface 141c) and the inner peripheral surface of the clutch housing 41 are pressed. The frictional force with 41c is easily increased. Then, this frictional force makes it difficult for the support member 140 to rotate around the rotation axis of the drive-side rotating body 42. Therefore, it is possible to more easily prevent the support member 140 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

<Fourth Embodiment>
Hereinafter, a fourth embodiment of the motor provided with the clutch will be described. In this embodiment, the same configurations as those of the first embodiment and the corresponding configurations are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 13A and 13B, the clutch 150 of the present embodiment is provided in the motor 10 in place of the clutch 40 of the first embodiment. The clutch 150 is configured to include a support member 160 instead of the support member 43 in the clutch 40 of the first embodiment. The support member 160 does not include the first and second inclined surfaces 69a and 69b of the first embodiment, and the first and second roller supports 64a and 64b are the rotation axes of the drive-side rotating body 42. The width in the circumferential direction (rotational direction of the driving side rotating body 42) is constant along the direction.

The support member 160 has a configuration in which a plurality of resistance projections 161 as load generating portions are provided on the ring portion 61 of the support member 43 of the first embodiment. The plurality of resistance projections 161 are one end surfaces of the ring portion 61 in the axial direction and project in the axial direction from the end surfaces facing the flange portion 52 in the axial direction. In the present embodiment, 24 resistance protrusions 161 are provided on one end surface of the ring portion 61 in the axial direction at equal angular intervals (15 ° intervals) in the circumferential direction. In addition, in FIG. 13B, in order to avoid complicating the drawing, only the resistance projection 161 provided in the lower half of the ring portion 61 in FIG. 13A is shown and provided in the upper half. The illustration of the resistance projection 161 is omitted. Each resistance projection 161 has a substantially flat plate shape, and when the ring portion 61 is viewed from the outside in the radial direction, it protrudes in the axial direction from one end surface in the axial direction of the ring portion 61 and in the rotation axis L8 direction of the support member 160. It is inclined with respect to. In the present embodiment, when the ring portion 61 is viewed from the drive side rotating body 42 side (state shown in FIG. 13A), the tip of each resistance projection 161 is on the counterclockwise side of the base end thereof. It is tilted to be located. Further, the height of each resistance projection 161 in the rotation axis L8 direction is lower than the height of the upper protrusion 61b in the rotation axis L8 direction. Therefore, in the state where the support member 160 and the driving side rotating body 42 are assembled, the upper protrusion 61b abuts on the flange 52 from the axial direction, but each resistance projection 161 does not abut on the flange 52.

Each resistance projection 161 has first and second resistance inclined surfaces 162a and 162b at both ends of the support member 160 in the rotation direction. In each resistance projection 161, one side surface of the support member 160 in the rotation direction (the side surface on the counterclockwise side when the ring portion 61 is viewed from the drive side rotating body 42 side and the right side surface in FIG. 13B). The first resistance inclined surface 162a is inclined with respect to the rotation axis L8 direction of the support member 160. In the present embodiment, in each resistance projection 161 the first resistance inclined surface 162a is inclined with respect to the rotation axis L8 direction so as to form an acute angle θ1 with one end surface of the ring portion 61 in the axial direction. .. Further, in each resistance projection 161, the side surface on the other side in the rotation direction of the support member 160 (the side surface on the clockwise side when the ring portion 61 is viewed from the drive side rotating body 42 side and the side surface on the left side in FIG. 13B). ), The second resistance inclined surface 162b is inclined with respect to the rotation axis L8 direction of the support member 160. In the present embodiment, in each resistance projection 161 the second resistance inclined surface 162b is inclined with respect to the rotation axis L8 direction so as to form an obtuse angle θ2 with one end surface of the ring portion 61 in the axial direction. ..

Next, the operation of this embodiment will be described.
When the rotary drive of the rotary shaft 24 is started by the drive of the motor unit 20, the rotary drive of the drive-side rotating body 42 that rotates integrally with the rotary shaft 24 is started. As the driving side rotating body 42 rotates, the circumferential end portion of each rolling body releasing portion 57 of the driving side rotating body 42 on the front side in the rotating direction comes into contact with each rolling body holding portion 62 in the rotating direction (FIG. 8 (a)).

Here, FIG. 14A illustrates the case where the drive-side rotating body 42 rotates in the counterclockwise direction (in the direction of arrow α1 in FIG. 14A) when viewed from the motor unit 20 side. Since the air resistance of the support member 160 is increased by the plurality of resistance projections 161, the air resistance of the support member 160 is increased as compared with the support member not provided with the resistance projections 161. Therefore, the support member 160 is difficult to rotate around the rotation axis of the drive-side rotating body 42. Further, each resistance projection 161 projecting from the ring portion 61 in the axial direction has a first resistance inclined surface 162a inclined with respect to the rotation axis L8 direction of the support member 160. Therefore, when the support member 160 rotates around the rotation axis of the drive-side rotating body 42, the pressing force F3 due to the air resistance acting on the first resistance inclined surface 162a corresponds to the inclination direction of the first resistance inclined surface 162a. A component force F3a in the direction of the rotation axis L8 of the support member 160 is generated. In the present embodiment, the component force F3a is a force toward the driving side rotating body 42 side. By this component force F3a, the support member 160 is pressed toward the drive-side rotating body 42 that overlaps the support member 160 in the direction of the rotation axis L8, so that the upper protrusion 61b is pressed against the flange portion 52. As a result, the frictional force between the upper protrusion 61b and the flange 52 is increased. That is, the resistance projection 161 having the first resistance inclined surface 162a acts to increase the frictional force between the upper protrusion 61b and the flange 52. Therefore, the support member 160 becomes more difficult to rotate around the rotation axis of the drive-side rotating body 42 due to the frictional force between the upper protrusion 61b and the flange portion 52. From these facts, at the start of the rotational drive of the drive side rotating body 42, the support member 160 is driven by the impact when the rolling element releasing portion 57 abuts on the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42. It is suppressed that the side rotating body 42 is blown in the rotation direction and rotates ahead of the driving side rotating body 42. Therefore, after the rolling element releasing portion 57 abuts on the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42, the driving side rotating body 42 and the support member 160 tend to rotate integrally. Then, each rolling element releasing portion 57 that comes into contact with each rolling element holding portion 62 in the rotational direction presses the rolling element 44 in the rotational direction of the driving side rotating body 42 via each rolling element holding portion 62. The sandwiching of each rolling element 44 by the inner peripheral surface of the clutch housing 41 and the control surface 83 of the driven side rotating body 45 is released (see FIG. 8A).

The support member 160 is pressed by the driving side rotating body 42 in the rotational direction of the driving side rotating body 42, so that the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 are released from sandwiching the rolling body 44. After that, the driven-side rotating body 45 may try to sandwich the rolling body 44 again with the inner peripheral surface 41c of the clutch housing 41. However, in the present embodiment, the support member 160 is prevented from rotating ahead of the drive-side rotating body 42, so that the drive-side rotating body 42 and the support member 160 can easily rotate integrally. .. Therefore, when the driving side rotating body 42 and the support member 160 rotate integrally, the sandwiching of the rolling body 44 by the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 is immediately released.

Further, as shown in FIG. 14B, there is also a case where the driving side rotating body 42 is rotated in the clockwise direction (in the direction of arrow α2 in FIG. 14B) when viewed from the motor unit 20 side by driving the motor unit 20. A similar effect can be obtained. That is, since the support member 160 has increased air resistance due to the plurality of resistance projections 161, the air resistance is increased as compared with the support member not provided with the resistance projections 161. Therefore, the support member 160 is difficult to rotate around the rotation axis of the drive-side rotating body 42. Further, each resistance projection 161 projecting from the ring portion 61 in the axial direction has a second resistance inclined surface 162b inclined with respect to the rotation axis L8 direction of the support member 160. Therefore, when the support member 160 rotates around the rotation axis of the drive-side rotating body 42, the pressing force F4 due to the air resistance acting on the second resistance inclined surface 162b corresponds to the inclination direction of the second resistance inclined surface 162b. A component force F4a in the direction of the rotation axis L8 of the support member 160 is generated. In this case, the component force F4a is a force directed in the direction opposite to the driving side rotating body 42. By this component force F4a, the support member 160 is pressed toward the clutch housing 41 that overlaps the support member 160 in the direction of the rotation axis L8, so that the lower protrusion 61a is pressed against the flange portion 41a. As a result, the frictional force between the lower protrusion 61a and the flange 41a is increased. That is, the resistance projection 161 having the second resistance inclined surface 162b acts to increase the frictional force between the lower protrusion 61a and the flange portion 41a. Therefore, the support member 160 becomes more difficult to rotate around the rotation axis of the drive-side rotating body 42 due to the frictional force between the lower protrusion 61a and the flange portion 41a. From these facts, even when the driving side rotating body 42 rotates in the direction of the arrow α2, the rolling element releasing portion 57 starts from the rotating direction of the driving side rotating body 42 at the start of the rotational driving of the driving side rotating body 42. It is suppressed that the support member 160 is blown in the rotation direction of the driving side rotating body 42 by the impact when it comes into contact with the rolling body holding portion 62 and rotates ahead of the driving side rotating body 42. Therefore, after the rolling element releasing portion 57 abuts on the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42, the driving side rotating body 42 and the support member 160 tend to rotate integrally.

According to the present embodiment, in addition to the same effect as (1) of the first embodiment, the following effects can be obtained.
(1) The support member 160 has a lower protrusion 61a that contacts the flange portion 41a of the clutch housing 41 and an upper protrusion 61b that contacts the flange portion 52 of the drive-side rotating body 42. The resistance projection 161 is a frictional force between the lower protrusion 61a and the flange 41a or a frictional force between the upper protrusion 61b and the flange 52 at the start of the rotational drive of the drive-side rotating body 42. Acts to increase. In this way, the frictional force between the lower protrusion 61a and the flange portion 41a or the frictional force between the upper protrusion 61b and the flange portion 52 is increased by the resistance protrusion 161. It becomes difficult for the support member 160 to rotate around the rotation axis of the drive-side rotating body 42. Therefore, it is possible to easily prevent the support member 160 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42 by the frictional force. it can. As a result, it is possible to easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

(2) The support member 160 attaches the support member 160 to the clutch housing 41 or the drive-side rotating body 42 so that the lower protrusion 61a is pressed against the flange portion 41a or the upper protrusion 61b is pressed against the flange portion 52. It has a resistance projection 161 that generates a pressing force (that is, a component force F3a or a component force F4a) that is pressed toward it. Then, the lower protrusion 61a is pressed against the flange 41a by the component force F3a generated by the resistance projection 161, so that the frictional force between the lower protrusion 61a and the flange 41a is easily increased. Further, by pressing the upper protrusion 61b against the collar 52, the frictional force between the upper protrusion 61b and the collar 52 is easily increased. This frictional force makes it difficult for the support member 160 to rotate around the rotation axis of the drive-side rotating body 42. Therefore, it is possible to more easily prevent the support member 160 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

(3) When the support member 160 around the rotation axis of the drive-side rotating body 42 is rotated, the air resistance acting on the support member 160 is increased by the resistance projection 161. Therefore, the support member 160 rotates the drive-side rotating body 42. It becomes difficult to rotate around the axis. Therefore, it is possible to easily prevent the support member 160 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42 by the resistance projection 161. it can. As a result, the generation of noise at the start of the rotational drive of the drive-side rotating body 42 can be easily suppressed.

(4) The resistance protrusion 161 protruding in the axial direction from one end surface in the axial direction of the ring portion 61 is inclined with respect to the rotation axis L8 direction of the support member 160 (same as the rotation axis direction of the drive side rotating body 42). It has first and second resistance inclined surfaces 162a and 162b. Therefore, when the support member 160 rotates around the rotation axis of the drive-side rotating body 42, the pressing force F3 due to the air resistance acting on the first resistance inclined surface 162a or the pressing force due to the air resistance acting on the second resistance inclined surface 162b A component force in the direction of the rotation axis L8 of the support member 160 is generated from the pressure F4. By this component force, the support member 160 is pressed toward the clutch housing 41 or the driving side rotating body 42 that overlaps the support member 160 in the direction of the rotation axis L8. As a result, it is possible to more effectively suppress the support member 160 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational drive of the driving-side rotating body 42. .. As a result, it is possible to more effectively suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

In addition, each of the above-mentioned embodiments may be changed as follows.
In the fourth embodiment, each resistance projection 161 has first and second resistance inclined surfaces 162a and 162b inclined with respect to the rotation axis L8 direction of the support member 160. However, each resistance projection 161 does not necessarily have to include the first and second resistance inclined surfaces 162a and 162b. For example, each resistance projection 161 may have a configuration in which only one of the first and second resistance inclined surfaces 162a and 162b is provided. Further, for example, each resistance projection 161 does not have any of the first and second resistance inclined surfaces 162a and 162b, that is, both end surfaces of each resistance projection 161 in the circumferential direction are parallel to the rotation axis L8 direction. It may be.

In the fourth embodiment, each resistance projection 161 projects from one end surface of the ring portion 61 in the axial direction in the direction of the rotation axis L8 of the support member 160. However, the resistance projection 161 may be provided at a position that protrudes from the outer surface of the support member 160 and increases the air resistance when the drive-side rotating body 42 of the support member 160 rotates around the rotation axis.

For example, the support member 170 shown in FIGS. 15A and 15B has a plurality of resistance protrusions 171 protruding radially outward from the outer peripheral surface of the ring portion 61. The plurality of resistance projections 171 have a substantially flat plate shape whose thickness direction is the circumferential direction of the ring portion 61, and are arranged in the circumferential direction of the ring portion 61. Further, each resistance projection 171 is inclined so that its tip is displaced to one side in the circumferential direction with respect to its base end. That is, each resistance projection 171 is inclined in the radial direction (direction orthogonal to the rotation axis of the support member 170). By doing so, the same effect as (3) of the fourth embodiment can be obtained. Further, since each resistance projection 171 is inclined with respect to the radial direction, the support member 170 can be miniaturized in the radial direction as compared with the case where each resistance projection 171 extends along the radial direction.

In addition, each resistance projection 171 may be configured so that its tip extends along the radial direction without shifting in the circumferential direction with respect to its base end. Even in this way, the same effect as in (3) of the fourth embodiment can be obtained. Further, the resistance projection 171 may be inclined with respect to the rotation axis direction of the support member 170. By doing so, the same effect as that of the fourth embodiment can be obtained.

Further, as shown in FIGS. 16A and 16B, a resistance projection 171 may be further added to the support member 160 of the fourth embodiment. In this way, when the support member 160 around the rotation axis of the drive-side rotating body 42 is rotated, not only the resistance projection 161 but also the resistance projection 171 increases the air resistance acting on the support member 160, so that the support member 160 Is more difficult to rotate around the rotation axis of the drive-side rotating body 42. Therefore, it is possible to further prevent the support member 160 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42. As a result, it is possible to further suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

-In the third embodiment, the support member 140 has two urging portions 141. However, the number of the urging portions 141 included in the support member 140 is not limited to two, and may be a plurality. In addition, in order to prevent the rotation axis L7 of the support member 140 from deviating from the rotation axis of the driven side rotating body 45 (same as the central axis L2 of the worm shaft 34) due to the pressing force of the plurality of urging portions 141, each urging It is preferable that the position and pressing force of the portion 141 are adjusted.

The shape of the urging portion 141 included in the support member 140 of the third embodiment is not limited to that of the third embodiment. The urging portion 141 may be any as long as it comes into contact with the inner peripheral surface 41c of the clutch housing 41 and presses the inner peripheral surface 41c toward the outer side in the radial direction. For example, the urging portion 141 may be an elastic member provided so as to project radially outward from the outer peripheral surface of the axial support portion 63. The elastic member is made of, for example, an elastomer. The urging portion 141 made of an elastic member is arranged in a state of being elastically deformed so as to be crushed in the radial direction between the axial support portion 63 and the inner peripheral surface 41c of the clutch housing 41, and is internally deformed by the elastic force. The peripheral surface 41c is pressed outward in the radial direction. Even in this way, the same effect as that of the third embodiment can be obtained.

In the second embodiment, the first drive-side inclined surface 111a and the first inclined surface 121a, and the second driving-side inclined surface 111b and the second inclined surface 121b are in surface contact with each other, but are linear. It may be configured to be in contact.

In the second embodiment, when the first and second inclined surfaces 111a and 111b and the first and second inclined surfaces 121a and 121b come into contact with each other in the rotation direction of the driving side rotating body 110. , A pressing force (component force F2a) that presses the support member 120 toward the driving side rotating body 110 so that the upper protruding portion 61b is pressed against the flange portion 52 is generated. However, when the first and second inclined surfaces 111a and 111b and the first and second inclined surfaces 121a and 121b come into contact with each other in the rotation direction of the driving side rotating body 110, the lower protrusion 61a May be configured to generate a pressing force that presses the support member 120 toward the clutch housing 41 so that the support member 120 is pressed against the flange portion 41a. That is, the directions of inclination of the first and second drive-side inclined surfaces 111a and 111b with respect to the rotation axis L5 direction and the rotation axis so that the component force in the direction opposite to the component force F2a in the second embodiment is generated. The direction of inclination of the first and second inclined surfaces 121a and 121b with respect to the L6 direction may be opposite to that of the second embodiment. In this way, the lower protrusion 61a is pressed against the flange 41a by the generated pressing force (component force), so that the frictional force between the lower protrusion 61a and the flange 41a is easily increased. To. Then, this frictional force makes it difficult for the support member 120 to rotate around the rotation axis L5 of the drive-side rotating body 110. Therefore, even in this way, it is easier to prevent the support member 120 from rotating in the rotation direction of the drive-side rotating body 110 ahead of the driving-side rotating body 110 at the start of the rotational driving of the driving-side rotating body 110. can do. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 110.

In the first embodiment, the first and second inclined surfaces 69a and 69b have a flange portion on the lower protruding portion 61a when the rolling element releasing portion 57 abuts from the rotation direction of the driving side rotating body 42. A pressing force (component force F1a) that presses the support member 43 toward the clutch housing 41 so as to be pressed against the 41a is generated. However, on the first and second inclined surfaces 69a and 69b, the upper protrusion 61b is pressed against the flange 52 when the rolling element releasing portion 57 comes into contact with the driving side rotating body 42 from the rotation direction. It may be configured to generate a pressing force that presses the support member 43 toward the driving side rotating body 42. That is, when the rolling element releasing portion 57 abuts on the first and second inclined surfaces 69a and 69b from the rotation direction of the driving side rotating body 42, the component force in the direction opposite to the component force F1a in the first embodiment is described. The direction of inclination of the first and second inclined surfaces 69a and 69b with respect to the direction of the rotation axis L4 may be opposite to that of the first embodiment. In this way, the upper protrusion 61b is pressed against the flange 52 by the generated pressing force (component force), so that the frictional force between the upper protrusion 61b and the flange 52 is easily increased. Then, the frictional force makes it difficult for the support member 43 to rotate around the rotation axis of the drive-side rotating body 42. Therefore, even in this way, it is easier to prevent the support member 43 from rotating in the rotation direction of the drive-side rotating body 42 ahead of the driving-side rotating body 42 at the start of the rotational driving of the driving-side rotating body 42. can do. As a result, it is possible to more easily suppress the generation of noise at the start of the rotational drive of the drive-side rotating body 42.

-In each of the above embodiments, the lower protrusion 61a has a protrusion extending along the circumferential direction of the ring portion 61. However, the shape of the lower protrusion 61a is not limited to this, and may be any shape that protrudes in the axial direction from the ring portion 61 so as to be in contact with the flange portion 41a in the axial direction. For example, the lower protrusion 61a may be composed of a plurality of protrusions projecting from the ring portion 61 in the axial direction and intermittently provided along the circumferential direction.

-In each of the above embodiments, the upper protrusion 61b is a substantially hemispherical protrusion protruding in the axial direction from the ring portion 61. However, the shape of the upper protrusion 61b is not limited to this, and may be any shape that protrudes in the axial direction from the ring portion 61 so as to be in contact with the flange portion 52 in the axial direction. For example, the upper protrusion 61b may form an annular protrusion extending along the circumferential direction of the ring portion 61.

In the first embodiment, the support member 43 has a lower protrusion 61a that abuts on the flange 41a of the clutch housing 41 from the axial direction. However, the support member 43 does not necessarily have to come into direct contact with the flange portion 41a. For example, a member such as a washer may be interposed between the ring portion 61 and the flange portion 41a. The same applies to the support members 120, 140, 160 of the second to fourth embodiments.

In the first embodiment, the support member 43 has an upper protrusion 61b that abuts on the flange 52 of the drive-side rotating body 42 from the axial direction. However, the support member 43 does not necessarily have to come into direct contact with the collar portion 52. For example, a member such as a washer may be interposed between the ring portion 61 and the flange portion 52. The same applies to the support members 120, 140, 160 of the second to fourth embodiments.

In the first embodiment, the shapes of the clutch housing 41, the driving side rotating body 42, the support member 43, the rolling body 44, and the driven side rotating body 45 constituting the clutch 40 are not necessarily the shapes of the first embodiment. You may. For example, the drive-side rotating body 42 may be integrally formed with the rotating shaft 24. Further, for example, the driven side rotating body 45 may be provided separately from the worm shaft 34 and assembled so as to be integrally rotatable with the worm shaft 34. Further, the number of rolling elements 44 is not limited to two, and at least one may be arranged between the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45. The same applies to the clutches 100, 130, and 150 of the second to fourth embodiments.

-A combination of two or more embodiments of the first to fourth embodiments may be carried out.
-In each of the above embodiments, the motor 10 is used as a drive source for the power window device, but it may be used as a drive source for other devices.

-In each of the above embodiments, the clutches 40, 100, 130, and 150 are provided in the motor 10 and connect the rotating shaft 24 and the worm shaft 34 of the speed reduction mechanism 32. However, even if the clutches 40, 100, 130, and 150 are provided in a device other than the motor 10 and connect the rotary shaft that is rotationally driven and the driven shaft to which the rotational driving force of the rotary shaft is transmitted. Good.

10 ... motor, 20 ... motor unit, 24 ... rotating shaft, 30 ... output unit, 34 ... worm shaft as driven shaft, 40, 100, 130, 150 ... clutch, 41 ... clutch housing, 41c ... inner peripheral surface, 42 , 110 ... Driving side rotating body, 43, 120, 140, 160, 170 ... Support member, 44 ... Rolling body, 45 ... Driven side rotating body, 61a ... Lower protrusion as first contact portion, 61b ... 2 Upper protrusions as contact portions, 69a, 121a ... load generating portion and first inclined surface as inclined surface, 69b, 121b ... load generating portion and second inclined surface as inclined surface, 111a ... drive side 1st drive-side inclined surface as an inclined surface, 111b ... a second drive-side inclined surface as a drive-side inclined surface, 141 ... an urging portion as a load generating portion, 141b ... a pressing portion as a first contact portion , 161, 171 ... Resistance protrusion as a load generating part, 161a ... First resistance inclined surface as a resistance inclined surface, 161b ... Second resistance inclined surface as a resistance inclined surface, F1a, F2a, F3a, F4a ... Push Component force as pressure, L4, L6, L7, L8 ... Rotation axis of support member, L5 ... Rotation axis of drive side rotating body.

Claims (4)

With an annular clutch housing
The drive side rotating body that is driven to rotate and
A driven side rotating body inserted inside the clutch housing and transmitting rotational driving force from the driving side rotating body,
It is arranged between the inner peripheral surface of the clutch housing and the driven side rotating body, and when the driving side rotating body is rotationally driven, it rotates together with the driving side rotating body around the rotation axis of the driving side rotating body, and the driving A rolling element that prevents the driven side rotating body from rotating by being sandwiched between the clutch housing and the driven side rotating body during non-rotational driving of the side rotating body.
A support member that holds the rolling element between the inner peripheral surface of the clutch housing and the driven side rotating body and can rotate around the rotation axis of the driving side rotating body together with the driving side rotating body.
With
At the start of rotational driving of the drive-side rotating body, the driving-side rotating body abuts on the support member from the rotation direction and presses the rolling element in the rotation direction via the support member, whereby the clutch housing and the clutch housing and the said. A clutch that releases the pinching of the rolling element by the driven rotating body.
The support member includes a load generating portion that generates a load that makes it difficult for the support member to rotate around the rotation axis of the driving side rotating body at least at the start of rotational driving of the driving side rotating body .
The support member has at least one contact portion of a first contact portion that contacts the clutch housing and a second contact portion that contacts the drive-side rotating body.
The load generating portion applies at least one of the frictional force between the clutch housing and the first contact portion and the frictional force between the driving side rotating body and the second contact portion. To increase
The support member has a portion that overlaps at least one of the clutch housing and the drive-side rotating body in the rotation axis direction of the support member.
The load generating portion is an inclined surface that is inclined with respect to the rotation axis direction of the support member and the drive side rotating body comes into contact with the driving side rotating body from the rotation direction at the start of rotational driving of the driving side rotating body. A clutch characterized by that. In the clutch according to claim 1 ,
The drive-side rotating body is inclined with respect to the rotation axis direction of the driving-side rotating body, and at the start of rotational driving of the driving-side rotating body, surface contact or line contact is made with the inclined surface from the rotation direction of the driving-side rotating body. A clutch characterized by having a drive-side inclined surface. In the clutch according to claim 1 or 2.
The load generating portion is directed toward the clutch housing or the driving side rotating body so that the first contacting portion is pressed against the clutch housing or the second contacting portion is pressed against the driving side rotating body. A clutch characterized by generating a pressing force for pressing the support member. A motor unit having a rotating shaft that is driven to rotate,
The clutch according to any one of claims 1 to 3 , which has the driving side rotating body that rotates integrally with the rotating shaft.
An output unit having a driven shaft that rotates integrally with the driven side rotating body and outputting a rotational driving force transmitted to the driven shaft.
A motor characterized by being equipped with.