JP2018155354A - Clutch and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch capable of suppressing generation of noise when starting rotational drive of a drive side rotor.SOLUTION: A rolling element 44 arranged between a driven side rotor to which a rotational driving force from a drive side rotor is transmitted and a clutch housing prevents rotation of the driven side rotor by being pinched between the clutch housing and the driven side rotor when the drive side rotor is not rotationally driving. A support member 43 includes a rolling element holding part 62 including a pair of support parts 64a, 64b protruding in a rotational axis line direction of the drive side rotor on both sides of the rolling element 44 and holding the rolling element 44 between the clutch housing and the driven side rotor. Tip parts of the pair of support parts 64a, 64b are connected with each other by a support connection part 66. When starting rotational drive of the drive side rotor, by the drive side rotor pressing the rolling element 44 via the rolling element holding part 62 in a rotation direction, the pinching of the rolling element 44 by the clutch housing and the driven side rotor is cancelled.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a clutch and a motor.

  2. Description of the Related Art Conventionally, a motor used as a drive source for a power window device or the like mounted on a vehicle has a motor unit having a rotating shaft that is driven to rotate and a driven shaft that transmits the rotational driving force of the rotating shaft. And an output unit that outputs the rotational driving force transmitted to the motor. For example, as described in Patent Document 1, the rotating shaft and the driven shaft transmit the rotational driving force of the rotating shaft to the driven shaft while not transmitting 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 rotator that rotates integrally with a rotation shaft, a driven-side rotator that can engage with the drive-side rotator in the rotation direction, and rotates integrally with the driven shaft, and a drive-side rotation. And a cylindrical clutch housing in which the body and the driven side rotating body are inserted. Further, between the inner peripheral surface of the clutch housing and the driven side rotator, the driven shaft is sandwiched between the inner peripheral surface of the clutch housing and the driven side rotator when the rotary shaft is not driven to rotate (becomes a wedge). A rolling element for preventing the rotation of the side rotating body (that is, the rotation of the driven shaft) is interposed. This rolling element is held by a support member inserted inside the clutch housing. The support member has a pair of support portions projecting in the rotation axis direction of the driving side rotating body on both sides of the rolling body in the rotating direction of the driving side rotating body, and between the inner peripheral surface of the clutch housing and the driven side rotating body. A rolling element holding part for holding the rolling element is provided. Further, the support member can rotate around the rotation axis of the driving side rotating body together with the driving side rotating body.

  In such a clutch, at the start of rotational driving of the rotating shaft, the driving side rotating body comes into contact with the rolling element holding part of the support member from the rotation direction of the driving side rotating body and drives the rolling element through the rolling element holding part. By pressing in the rotational direction of the side rotating body, the rolling body is held between the inner peripheral surface of the clutch housing and the driven side rotating body. When the rotary shaft is driven to rotate, the support member is pushed by the drive-side rotator and rotates around the rotation axis of the drive-side rotator together with the drive-side rotator. Therefore, at the time of rotational driving of the rotating shaft, the rolling element rotates with the driving side rotating body and the driven side rotating body around the rotation axis of the driving side rotating body along the inner peripheral surface of the clutch housing while being held by the support member. .

JP 2012-82952 A

  As described above, at the start of rotational driving of the rotating shaft (drive-side rotator), the drive-side rotator rotates relative to the support member, and the drive-side rotator holds the rolling element from the rotation direction of the drive-side rolling element. Abuts against the part. When the driving body is pressed in the rotational direction of the driving side rotating body via the support member while the driving side rotating body is in contact with the rolling element holding portion, the inner peripheral surface of the clutch housing and the driven side rotating body The holding of the rolling element is released. In this case, even if the driven-side rotator that has been rotated integrally with the drive-side rotator after the unclamping of the rolling element is about to be sandwiched between the inner peripheral surface of the clutch housing, Since the driving side rotating body keeps pressing against the rolling element holding portion from the rotation direction, the support member holding the rolling element rotates integrally with the driving side rotating body. Therefore, the holding of the rolling element by the inner peripheral surface of the clutch housing and the driven rotating body is immediately released. Therefore, in this case, it is possible to smoothly release the rolling element between the inner peripheral surface of the clutch housing and the driven-side rotating body, and it is difficult for noise to be generated in the clutch at the start of rotational driving of the rotating shaft.

  However, the support member that holds the rolling element is blown in the rotation direction of the driving side rotating body by an impact when the driving side rotating body comes into contact with the rolling element holding portion at the start of rotation driving of the rotating shaft. The member may rotate before the driving side rotating body. Then, even if the rolling body was once released from being held by the inner peripheral surface of the clutch housing and the driven side rotating body, the rotational speed increased until the driving side rotating body again contacted the rolling body holding portion. It will be pinched again between the inner peripheral surface of a clutch housing by the driven side rotary body. Further, when the driving side rotating body comes into contact with the rolling body holding portion again to release the holding 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. End up. Further, due to the impact when the driving side rotating body comes into contact with the rolling element holding portion again, the support member holding the rolling body again rotates ahead of the driving side rotating body, and the above operation is repeated. Sometimes. In such a case, noise is generated a plurality of times in the clutch before the rolling element is completely held between the inner peripheral surface of the clutch housing and the driven side rotating body.

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

  A clutch that solves the above problems includes an annular clutch housing, a drive-side rotator that is rotationally driven, a driven-side rotator that is inserted inside the clutch housing and to which a rotational drive force is transmitted from the drive-side rotator. The clutch housing is disposed between the inner peripheral surface of the clutch housing and the driven side rotating body, and is sandwiched between the clutch housing and the driven side rotating body when the driving side rotating body is not rotated. A rolling element that prevents rotation of the driven-side rotating body, and a pair of first and second support portions that protrude in the rotational axis direction of the driving-side rotating body on both sides of the rolling body in the rotational direction of the driving-side rotating body. Having a rolling element holding portion for holding the rolling element between the inner peripheral surface of the clutch housing and the driven side rotating body, together with the driving side rotating body and around the rotation axis of the driving side rotating body A rotating support member, and at the start of rotational driving of the driving side rotating body, the driving side rotating body comes into contact with the rolling element holding portion from the rotation direction and the rolling element is interposed via the rolling element holding portion. Is a clutch that releases the holding of the rolling element by the clutch housing and the driven-side rotating body by pressing in the rotational direction, and the driving-side rotating body in the first and second support portions that make a pair The support connection part which connects the front-end | tip parts of the rotation axis direction of was provided.

  According to this configuration, in the rolling element holding portion, the tip end portions in the rotation axis direction of the driving side rotating body in the first and second support portions that form a pair are connected by the support connecting portion. Therefore, at the start of the rotational drive of the drive side rotator, the first and second support parts paired by an impact when the drive side rotator contacts the rolling element holding part from the rotation direction of the drive side rotator are elastic. It is possible to suppress the deformation and opening in the rotational direction so as to be separated from each other. Therefore, it is suppressed that the support member is blown in the rotation direction with respect to the driving side rotating body by the elastic force accompanying the elastic deformation of the support portion. Therefore, at the start of the rotational drive of the drive-side rotator, the support member flies in the rotation direction of the drive-side rotator due to an impact when the drive-side rotator contacts the rolling element holder from the rotation direction of the drive-side rotator. Thus, it is possible to suppress the rotation before the driving side rotating body. Therefore, after the driving side rotating body comes into contact with the rolling element holding portion from the rotation direction of the driving side rotating body, the driving side rotating body and the support member tend to rotate integrally. Therefore, after the rolling element holding portion is pressed in the rotation direction of the driving side rotating body by the driving side rotating body, the holding of the rolling element by the clutch housing and the driven side rotating body is released, and the driven side rotating body becomes the clutch housing. Even if it is attempted to sandwich the rolling element again between the two, the holding of the rolling element by the clutch housing and the driven side rotating body is immediately released. As described above, since the driving side rotating body and the rolling element holding portion can be prevented from being repeatedly separated or abutted in the rotation direction of the driving side rotating body at the start of the rotational driving of the driving side rotating body, Generation of noise at the start of rotational driving of the body can be suppressed.

In the clutch, the support connecting portion is preferably provided integrally with the support member.
According to this configuration, an increase in the number of parts due to the provision of the support connecting portion can be suppressed. Therefore, it is possible to suppress the generation of noise at the start of the rotational drive of the drive side rotator without increasing the number of parts.

In the clutch, the support connecting portion is preferably formed separately from the support member and is assembled to the support member.
According to this structure, it is possible to assemble the support connecting portion to the support member after assembling the rolling elements between the pair of support portions. In this case, since the rolling element can be inserted between the pair of support parts from the front end side in the rotation axis direction of the drive side rotating body in the support part, the assembly of the rolling element to the support member can be easily performed. it can.

In the clutch, the support connecting portion is preferably a weight with respect to the support member.
According to this configuration, since the moment of inertia of the support member is increased, the support member that has stopped rotating does not easily start to rotate around the rotation axis of the drive side rotating body. Therefore, at the start of the rotational drive of the drive-side rotator, the support member flies in the rotation direction of the drive-side rotator due to an impact when the drive-side rotator contacts the rolling element holder from the rotation direction of the drive-side rotator. Thus, it is possible to further suppress the rotation before the driving side rotating body. Therefore, after the driving side rotating body comes into contact with the rolling element holding portion from the rotation direction of the driving side rotating body, the driving side rotating body and the support member are more likely to rotate integrally. As a result, it is possible to further suppress the drive-side rotator and the rolling element holder from being repeatedly separated or abutted in the rotation direction of the drive-side rotator at the start of the rotational drive of the drive-side rotator. Generation of noise at the start of rotation driving of the body can be further suppressed.

  In the clutch, the support member includes a plurality of the rolling element holding portions that hold the rolling elements side by side in the rotation direction of the support member, and the two rolling element holding portions that are adjacent to each other in the rotation direction of the support member. Of the first support part of one of the rolling element holding parts, the tip end part in the rotational axis direction of the drive side rotating body, and the other rolling element adjacent to the first support part and the support member in the rotational direction. It is preferable that a connecting portion that connects the tip end portion in the rotation axis direction of the drive side rotating body in the second support portion of the holding portion is provided.

  According to this configuration, in the two rolling element holding portions adjacent to each other in the rotation direction of the driving side rotating body (support member), in the two support portions between the two rolling elements held by the two rolling element holding portions. The front end portions in the rotation axis direction of the driving side rotating body are connected by a connecting portion. Therefore, at the start of the rotational drive of the drive-side rotator, the drive-side rotator comes into contact with any one of the two rolling-element holders in the rotation direction of the drive-side rotator from the rotation direction. Even when the driving side rotating body is not in contact with the other rolling element holding portion from the rotation direction, the pressing force in the rotating direction of the driving side rotating body applied to the one rolling body holding portion is It is also transmitted to the other rolling element holding part via the connecting part. In this way, since the pressing force in the rotation direction of the driving side rotating body is also applied to the other rolling element holding portion via the connecting portion, the two rolling element holding portions adjacent to each other in the rotation direction of the driving side rotating body are held. In the two rolling elements, it is possible to prevent the timing at which the clamping between the clutch housing and the driven-side rotating body is released from shifting. Therefore, at the start of the rotational driving of the driving side rotating body, the holding of each rolling element by the clutch housing and the driven side rotating body can be released more smoothly.

  A motor that solves the above problems includes a motor unit having a rotary shaft that is rotationally driven, the clutch that has the drive-side rotary body that rotates integrally with the rotary shaft, and a driven shaft that rotates integrally with the driven-side rotary body. And an output unit for outputting the rotational driving force transmitted to the driven shaft.

  According to this configuration, since the motor includes the clutch in which the generation of noise at the start of the rotational drive of the driving side rotating body is suppressed, noise may be generated in the motor at the start of the rotational drive of the rotary 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 rotational driving of the driving side rotating body.

Sectional drawing of the motor of 1st Embodiment. The partial expanded sectional view of the motor of a 1st embodiment. The disassembled perspective view of the clutch in 1st Embodiment. The perspective view of the support member holding the rolling element in 1st Embodiment. (A) is a side view of the support member holding the rolling element in the first embodiment, and (b) is a bottom view of the support member. (A) is sectional drawing (6a-6a sectional drawing in FIG. 2) of the clutch in 1st Embodiment, (b) is sectional drawing (6b-6b sectional drawing in FIG. 2) of the clutch. (A) And (b) is sectional drawing for demonstrating operation | movement of the clutch in 1st Embodiment. (A) And (b) is sectional drawing for demonstrating operation | movement of the clutch in 1st Embodiment. The disassembled perspective view of the support member in 2nd Embodiment, a rolling element, and a support connection part. The perspective view of the support member in which the support connection part in 2nd Embodiment was assembled | attached. The schematic diagram of the support member holding the rolling element in 2nd Embodiment.

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

  The motor unit 20 of the present embodiment is a DC motor. A magnet 22 is fixed to an inner peripheral surface of a bottomed cylindrical yoke housing 21 (hereinafter referred to as a yoke 21) constituting the motor unit 20, and an armature 23 is disposed inside the magnet 22. . The armature 23 includes a rotating shaft 24 disposed at the center of the yoke 21. A base end portion (upper end portion in FIG. 1) of the rotating shaft 24 is supported by a bearing 25 provided at the center of the bottom of the yoke 21. A commutator 26 is fixed. Moreover, the front-end | tip part (lower edge part in FIG. 1) of the rotating shaft 24 is the connection part 24a which makes | forms the two-plane width shape chamfered in parallel from the column shape.

  A flange portion 21 a extending outward is formed in the opening portion of the yoke 21, and a brush holder 27 is fitted in the opening portion of the yoke 21. The brush holder 27 has a holder main body 27a having a shape for closing the opening of the yoke 21, and a connector part 27b protruding from the holder main body 27a to the outer side in the radial direction of the yoke 21 and connected to an external connector (not shown). The holder main body 27a holds a plurality of power supply brushes 28 that are electrically connected to the connector portion 27b by wires (not shown) and are in sliding contact with the commutator 26. The holder main body 27a holds a bearing 29 at 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. When the external power 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 driven to rotate, that is, the motor portion 20 is It is designed to rotate.

  The output unit 30 is formed by housing a speed reduction mechanism 32 and the like in a resin gear housing 31. The gear housing 31 includes a fixing portion 31 a for fixing the gear housing 31 to the motor portion 20 at a portion (an upper end portion in FIG. 1) facing the motor portion 20 in the axial direction. The fixed portion 31 a has an outer shape similar to the outer shape of the flange portion 21 a of the yoke 21, and an accommodating recess 31 b that opens toward the inside of the yoke 21 is formed in the fixed portion 31 a. Then, in a state where a part of the holder main body 27a of the brush holder 27 is inserted into the housing recess 31b, the flange portion 21a that is 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 fixed portion 31a.

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

  A substantially cylindrical worm shaft 34 (driven shaft) is accommodated in the worm shaft accommodating portion 31d. The worm shaft 34 is made of a metal material, and a screw-like worm portion 34a is formed at a substantially central portion in the axial direction. The worm shaft 34 is supported at both ends in the axial direction by a pair of bearings 35 and 36 disposed at both ends in the axial direction of the worm shaft housing portion 31d. The worm shaft 34 disposed in the worm shaft housing portion 31d is supported by bearings 35 and 36 so as to be disposed coaxially with the rotary shaft 24, that is, the central axis L1 of the rotary shaft 24 and the worm shaft 34. The central axis line L2 is arranged on the same straight line.

  A disc-shaped worm wheel 37 that meshes with the worm portion 34a of the worm shaft 34 is rotatably accommodated in the wheel accommodating portion 31e. The worm wheel 37 and the worm shaft 34 constitute a speed reduction mechanism 32. That is, the speed reduction mechanism 32 of the present embodiment is a worm speed reduction mechanism (worm gear). In addition, 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 together with the worm wheel 37 is provided at the radial center of the worm wheel 37. A window glass of a vehicle is connected to the output shaft 38 via a window 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 housing recess 31c.
As shown in FIGS. 2 and 3, the clutch 40 includes 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-like flange portion 41 a that extends radially outward is formed at one axial end portion of the clutch housing 41. The outer diameter of the cylindrical portion of the clutch housing 41 is formed substantially equal to the inner diameter of the clutch housing recess 31c, and the outer diameter of the flange portion 41a is formed larger than the inner diameter of the clutch housing recess 31c. In addition, fixed recesses 41b are formed in the flange portion 41a at four locations that are equiangularly spaced in the circumferential direction. Each fixed 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 housing recess 31c until the flange portion 41a contacts the bottom surface of the housing recess 31b, and is fixed to the gear housing 31 at the flange portion 41a. . Specifically, on the outer surface of the opening of the clutch housing recess 31c on the bottom surface of the housing recess 31b, four fixed projections 31f projecting in the axial direction are formed at equiangular intervals in the circumferential direction. These four fixed protrusions 31f are inserted in the four fixed recesses 41b of the flange portion 41a in the axial direction, respectively, and the tip ends of the respective fixed protrusions 31f are processed by heat caulking. Thereby, the clutch housing 41 is fixed to the gear housing 31 so as not to move in the axial direction and to rotate in the circumferential direction. The clutch housing 41 fixed to the gear housing 31 is arranged coaxially with the rotary shaft 24 and the worm shaft 34.

  As shown in FIGS. 2 and 3, the drive-side rotator 42 has a substantially cylindrical shaft coupling portion 51. On the outer peripheral surface of the shaft connecting portion 51, a disc-shaped flange portion 52 that extends outward in the radial direction is integrally formed.

  In the shaft coupling 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 two-sided width shape corresponding to the outer shape of the connecting portion 24 a of the rotating shaft 24. Then, when the connecting portion 24 a is press-fitted into the drive shaft insertion hole 53, the drive side rotating body 42 is connected to the rotary shaft 24 so as to be integrally rotatable. The rotating shaft 24 and the drive-side rotating body 42 connected to the rotating shaft 24 are coaxial (that is, their center axes are located on the same straight line).

  Further, in the shaft coupling 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 center axis of the driven shaft insertion hole 54 coincides with the center axis of the drive shaft insertion hole 53. In this embodiment, the drive shaft insertion hole 53 and the driven shaft insertion hole 54 communicate with each other.

  As shown in FIG. 6B, the inner peripheral surface of the driven shaft insertion hole 54 has a pair of drive side transmission surfaces 54a that are parallel to each other in a planar shape parallel to the axial direction. The shape of the driven shaft insertion hole 54 viewed from the axial direction is a substantially track shape (two directions parallel to the drive-side transmission surface 54a and the short-side direction perpendicular to the drive-side transmission surface 54a). (Width shape). Each drive-side transmission surface 54a is provided with two first elastic members 55 made of an elastic material such as a rubber material. Moreover, the 2nd elastic member 56 which consists of materials which have elasticity, such as a rubber material, is each provided in the both ends of the longitudinal direction of the driven shaft insertion hole 54 seeing axially. The first and second elastic members 55 and 56 slightly protrude inward from the inner peripheral surface of the driven shaft insertion hole 54.

  Further, as shown in FIGS. 3 and 6A, the drive-side rotating body 42 is released from a pair of rolling elements extending from the flange portion 52 to the output portion 30 side (downward in FIG. 3) in the axial direction. Part 57. The rolling element releasing portions 57 are provided on both sides in the longitudinal direction of the driven shaft insertion hole 54 as viewed in the axial direction. Further, the two rolling element releasing portions 57 are provided at positions that are separated from each other by 180 ° in the rotation direction and opposed in the radial direction. In addition, the both ends of the circumferential direction in each rolling element cancellation | release part 57 are comprised by the elastic part 58 which consists of materials which have elasticity, such as a rubber material. Each of the rolling element release portions 57 is disposed inside the clutch housing 41.

  As shown in FIGS. 2 and 4, the support member 43 holds the rolling element 44 between the clutch housing 41 and the driven-side rotating body 45 that are opposed in the radial direction. The support member 43 of this embodiment is made of resin.

  The support member 43 includes a ring portion 61 that forms an annular shape centering on the central axis L <b> 2 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 disposed on the motor portion 20 side (the 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.

  On the lower surface of the ring portion 61 (the end surface in the axial direction facing the flange portion 41a), an annular protrusion is formed along the circumferential direction of the ring portion 61, and the lower protrusion portion 61a that contacts the flange portion 41a from the axial direction. Is provided. A plurality of upper protrusions 61b having a substantially hemispherical shape protruding in the axial direction are provided on the upper surface of the ring portion 61 (the end surface in the axial direction facing the flange portion 52). In the present embodiment, the upper protrusions 61b are provided at four locations separated in the circumferential direction. Each upper protrusion 61b has an end abutted against the flange 52 from the output part 30 side in the axial direction.

  In addition, at two locations spaced apart in the circumferential direction on the inner circumferential side of the ring portion 61 (two locations at an interval of 180 ° in the present embodiment), the rotational axis direction (center axis L1) from the ring portion 61 to the drive side rotating body 42 is provided. A rolling element holding part 62 protruding in the same direction) is formed. The two rolling element holding portions 62 each hold a rolling element 44 having a columnar shape extending in the axial direction.

Here, the rolling element 44 held by the rolling element holder 62 will be described in detail.
As shown in FIGS. 5A and 5B, 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. As for each rolling element 44 of this embodiment, the shape seen from the axial direction has comprised the double-sided width shape. 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. 5B, 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 short direction of the rolling element 44. Each rolling element 44 has first and second opposing surfaces 71a that are planar on both sides in the rotational direction X1 of the drive-side rotator 42 (the same as the circumferential direction of the clutch 40, hereinafter referred to as the rotational direction X1). , 71b. Furthermore, each rolling element 44 has first and second arcuate surfaces 72 a and 72 b on both sides in the radial direction of the clutch 40.

  In each rolling element 44, the first and second opposing surfaces 71a and 71b are parallel to the central axis L3 and parallel to each other. In each rolling element 44, the first and second arc surfaces 72a and 72b have an arc shape with the center 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. The first and second arcuate surfaces 72a and 72b are formed in parallel to the central axis L3 without being inclined.

  As shown in FIG. 6A, in each rolling element 44, the first arcuate surface 72a located on the radially outer side is opposed to the cylindrical inner peripheral surface 41c of the clutch housing 41 in the radial direction. It is possible to contact the peripheral surface 41c. On the other hand, in each rolling element 44, the second arcuate surface 72 b located on the radially inner side is opposed to the driven-side rotator 45 in the radial direction and can contact the driven-side rotator 45.

  As shown in FIGS. 4, 5 (a), and 5 (b), each of the rolling element holding portions 62 has an axial support portion 63 that extends radially inward from the ring portion 61. The axial support part 63 faces the rolling element 44 in the axial direction.

  Further, each rolling element holding portion 62 is opposite to the ring portion 61 along the axial direction (center axis L1, L2 direction) from both circumferential ends of the axial support portion 63 (downward in FIG. 5A). And a pair of support portions 64a and 64b. That is, in each rolling element holding portion 62, the pair of support portions 64a and 64b protrude in the rotational axis direction of the drive side rotating body 42 on both sides of the rolling element 44 in the rotational direction X1. The pair of support portions 64a and 64b extend in parallel to each other along the axial direction. In each rolling element holding part 62, the pair of support parts 64a and 64b hold the rolling element 44 from both sides in the rotational direction X1 so that the central axis L3 is parallel to the central axis L1. In addition, regarding the support portions 64a and 64b forming a pair of the rolling element holding portions 62, the clutch 40 is viewed in the axial direction from the motor portion 20 side (that is, the state shown in FIG. A support portion positioned on the counterclockwise side is referred to as a first support portion 64a, and a support portion positioned on the clockwise side with respect to the rolling element 44 is referred to as a second support portion 64b.

  As shown in FIG. 5B, the distance between the first and second support portions 64a and 64b facing each other in each rolling element holding portion 62 is the maximum outer diameter of the rolling element 44 (that is, as viewed in the axial direction). Shorter than the width of the rolling element 44 in the longitudinal direction). Furthermore, the distance between the first and second support parts 64a and 64b facing each other in each rolling element holding part 62 is the width of the rolling element 44 in the rotational direction X1 (the first opposing surface 71a and the second opposing surface). 71b, which is slightly longer than the width in the short direction of the rolling element 44 when viewed in the axial direction.

  As shown in FIG. 4, FIG. 5A and FIG. 5B, in each rolling element holding portion 62, the rotation axis direction of the drive side rotating body 42 in the first support portion 64a (the rotation axis L4 of the support member 43). The tip of the second support portion 64b and the tip of the drive side rotating body 42 in the rotation axis direction are connected by a support connecting portion 66. The support connecting portion 66 of this embodiment is provided integrally with the support member 43. The support connecting portion 66 has a flat plate shape with a width substantially equal to the radial width of the first and second support portions 64a and 64b. Further, when viewed from the axial direction, the support connecting portion 66 has an arc shape centered on the rotation axis L <b> 4 of the support member 43. The support connecting portion 66 abuts against one end surface of the rolling element 44 in the axial direction from the axial direction, and suppresses the rolling element 44 from dropping off from the rolling element holding portion 62 in the axial direction.

  Further, the support member 43 includes a front end portion of the first support portion 64a of the one rolling element holding portion 62 in the rotation axis direction of the drive side rotating body 42 (same as the rotation axis L4 direction), the first support portion 64a, It has the connection part 67 which connects the front-end | tip part of the rotation-axis direction direction of the drive side rotary body 42 in the 2nd support part 64b of the other rolling element holding | maintenance part 62 adjacent to the rotation direction X1. The connecting portion 67 is provided integrally with the first and second support portions 64a and 64b, and has an arc shape centered on the rotation axis L4 when viewed in the axial direction. In the present embodiment, the radial width of the connecting portion 67 is substantially equal to the radial width of the support connecting portion 66.

  As shown in FIGS. 2 and 6 (a), the two rolling elements 44 are held at equal angular intervals (180 ° intervals in the present embodiment) in the rotation direction X1 by being held by the support member 43 having the above configuration. Has been placed. Further, since each rolling element holding portion 62 that holds the rolling element 44 is inserted and arranged inside the clutch housing 41, each rolling element 44 is arranged radially with the clutch housing 41 inside the clutch housing 41. Opposite to. The support member 43 can rotate relative to the clutch housing 41 in the rotation direction X1.

  Further, each rolling element release portion 57 of the drive 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. Furthermore, each rolling element release part 57 is each arrange | positioned between the two rolling element holding | maintenance parts 62, and is adjacent to each rolling element holding | maintenance part 62 in the rotation direction X1. Therefore, both end portions (respective elastic portions 58) in the rotation direction X1 in each rolling element release portion 57 are the first support portion 64a of one rolling element holding portion 62 and the second support portion 64b of the other rolling element holding portion 62. And the rotation direction X1. The support member 43 and the drive-side rotator 42 can be rotated relative to each other in the rotation direction X1. When the drive-side rotator 42 rotates, each rolling element release portion 57 is located on the front side in the rotation direction. The support portion 64a or the second support portion 64b comes into contact with the rotation direction.

  As shown in FIGS. 2 and 3, the driven-side rotator 45 is formed integrally with the base end portion (the 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 that are arranged in parallel in the axial direction. The driven side connecting portion 82 is provided on the base end side (the upper side in FIG. 2) of the control portion 81.

  The control unit 81 is formed integrally with the worm shaft 34 and has a column shape extending in the axial direction of the worm shaft 34. The central axis of the control unit 81 is coincident with the central axis L2 of the worm shaft 34, and is formed coaxially with the worm shaft 34. As shown in FIG. 6A, when viewed from the direction of the central axis L2, the control unit 81 has a point-symmetric shape with the central axis L2 of the worm shaft 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 that are equiangularly spaced in the circumferential direction (180 ° intervals in the present embodiment) on the outer peripheral surface of the control unit 81. Each control surface 83 has a planar shape that is parallel to the axial direction (the direction of the central axis L2) and orthogonal to the radial direction of the driven-side rotator 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 6B, the driven side connecting portion 82 has a column shape extending in the axial direction of the worm shaft 34. The center axis of the driven side connecting portion 82 coincides with the center axis L2 of the worm shaft 34, and is formed coaxially with the worm shaft 34. 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. In addition, when viewed 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 short direction of the driven side connecting portion 82 is a direction orthogonal to the control surface 83. (See also FIG. 6 (a)). As shown in FIG. 6B, when viewed from the direction of the central axis L2, the driven side connecting portion 82 has a point-symmetric 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 coupling portion 82. Of the two first driven side transmission surfaces 84 forming a pair, one first driven side transmission surface 84 is formed 180 ° opposite to the other first driven side transmission surface 84. The two first driven side transmission surfaces 84 are each 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 54 a provided in the driven shaft insertion hole 54 of the driving 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 in relation to the other second driven side transmission surface 85. It is formed on the opposite side of 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. 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 54 a provided in the driven shaft insertion hole 54 of the driving 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 of the driven side coupling portion 82 in the axial direction.

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

  Further, as shown in FIG. 6B, the driven side connecting portion 82 is loosely fitted in the driven shaft insertion hole 54 that 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 when viewed in the axial direction. The four first elastic members 55 are respectively 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.

  When the driving side rotating body 42 rotates around the central axis with respect to the driven side rotating body 45, the driving side transmission surface 54a elastically deforms the first elastic member 55 and the first and second driven side transmission surfaces. It abuts on either one of 84 and 85 in the rotational direction. As a result, the drive-side rotator 42 and the driven-side rotator 45 are engaged in the rotation direction, and the rotational driving force of the drive-side rotator 42 is transmitted to the driven-side rotator 45.

  Further, as shown in FIG. 6A, the control unit 81 of the driven side rotator 45 is arranged such that the rolling elements 44 are interposed between the control surfaces 83 and the inner peripheral surface 41 c of the clutch housing 41. It is inserted inside the support member 43 and faces the clutch housing 41 and the rolling elements 44 in the radial direction. That is, the support member 43 holds the rolling element 44 between the inner peripheral surface 41 c of the clutch housing 41 and each control surface 83 of the driven side rotating body 45.

  The distance between each control surface 83 and the inner peripheral surface 41 c of the clutch housing 41 (interval in the direction orthogonal to the control surface 83) changes in the rotation direction of the driven-side rotator 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 in the circumferential direction of each control surface 83, and from the center in the circumferential direction of each control surface 83 to the circumferential direction. It gradually shortens as it goes to both ends. Further, the distance between the center in the circumferential direction of each control surface 83 and the inner peripheral surface 41c of the clutch housing 41 is longer than the maximum outer diameter of the rolling element 44 and the circumferential end of each control surface 83. The distance from the inner peripheral surface 41 c 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 its operation, focusing on the operation of the clutch 40.
As shown in FIG. 2 and FIG. 7A, 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 rotator 42 is started. 7A and 7B illustrate a case where the drive side rotating body 42 is rotationally driven in the first direction R1. And as shown to Fig.7 (a), with the rotation of 1st direction R1 of the drive side rotary body 42, the circumferential direction of the rotation direction front side in each rolling element cancellation | release part 57 of the drive side rotary body 42 The end portion (elastic portion 58) contacts the first support portion 64a of each rolling element holding portion 62 in the rotational direction.

  Here, as shown in FIGS. 4 and 7A, in each rolling element holding portion 62, the distal ends of the pair of first and second support portions 64 a and 64 b in the direction of the rotation axis L <b> 4 are the support connecting portions 66. It is connected with. Therefore, at the start of the rotational driving of the driving side rotating body 42, the first and second pairs that are paired by the impact when the rolling element releasing portion 57 contacts the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42. It can suppress that the support parts 64a and 64b open in a rotation direction so that it may elastically deform and space apart. Therefore, it is suppressed that the support member 43 is blown in the rotation direction with respect to the drive side rotating body 42 by the elastic force accompanying the elastic deformation of at least one of the first and second support portions 64a and 64b. . Therefore, at the start of the rotational drive of the drive side rotator 42, the support member 43 is driven by the impact when the rolling element release portion 57 comes into contact with the first support portion 64a from the rotation direction of the drive side rotator 42. It is suppressed that it is skipped in the rotational direction 42 (the first direction R1 in the example shown in FIG. 7) and rotates ahead of the drive-side rotator 42. Therefore, after the rolling element releasing portion 57 comes into contact with the first support portion 64a from the rotation direction of the driving side rotating body 42, the driving side rotating body 42 and the support member 43 are likely to rotate integrally. Then, each rolling element release portion 57 that contacts the first support portion 64a of each rolling element holding portion 62 in the rotational direction presses each rolling element 44 in the first direction R1 via each first support portion 64a. By doing so, the holding 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. 7B, in the driving side rotating body 42, each driving side transmission surface 54 a comes into contact with each second driven side transmission surface 85 of the driven side coupling portion 82 from the first direction R <b> 1. Thus, the driven side rotating body 45 is connected so as to be integrally rotatable.

  Note that the inner peripheral surface 41c of the clutch housing 41 and the driven-side rotating body 45 are pressed by the driving-side rotating body 42 (the rolling-element releasing section 57) pressing the rolling-element holding section 62 in the rotation direction of the driving-side rotating body 42. After the holding of the rolling element 44 by the release is released, the driven side rotating body 45 may try to clamp the rolling element 44 again between the inner peripheral surface 41 c of the clutch housing 41. However, in the present embodiment, the support-side rotating body 42 and the support member 43 are easily rotated integrally by suppressing the support member 43 from rotating before the driving-side rotating body 42. . Therefore, when the driving side rotating body 42 and the support member 43 rotate integrally, the holding of the rolling element 44 by the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 is immediately released.

  And while each rolling element release part 57 presses the 1st support part 64a and rolling element 44 in the 1st direction R1, while the drive side rotating body 42 and the support member 43 rotate integrally, each rolling element 44 is arranged at the center in the circumferential direction of each control surface 83. That is, the rolling element 44 is not clamped between the control surface 83 and the clutch housing 41 (that is, does not hinder the rotation of the driven side rotating body 45), and is unlocked. 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 are moved in the first direction R1. The rotation of the worm shaft 34 in the first direction R <b> 1 is transmitted to the output shaft 38 while being decelerated between the worm wheel 37 and output from the output shaft 38. Then, the window glass of the vehicle is raised and lowered via a window regulator (not shown) according to the rotation direction of the output shaft 38. When the energization of the motor unit 20 is stopped, the rotational drive of the rotary shaft 24, that is, the rotational drive of the drive side rotating body 42 is stopped.

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

  As shown in FIGS. 8A and 8B, when the driving of the motor unit 20 is stopped, that is, when the rotating shaft 24 (driving side rotating body 42) is not rotated, the load side (this embodiment) is used. Then, when a load is applied to the output shaft 38 from the side of the window regulator), the driven side rotating body 45 tends to rotate due to the load. 8A and 8B illustrate a case where the driven-side rotator 45 attempts to rotate in the second direction R2. Then, each control surface 83 of the driven side rotating body 45 presses the rolling element 44 disposed between each control surface 83 and the inner peripheral surface 41 c of the clutch housing 41 to the outer peripheral side. The rolling element 44 pushed by the control surface 83 has the first arc surface 72a abutting against the inner peripheral surface 41c of the clutch housing 41 between the pair of support portions 64a and 64b, and the same control surface in the control surface 83. The second arcuate surface 72b comes into contact with a portion closer to the end in the circumferential direction (the end on the rear side in the second direction R2 in the control surface 83) than the center in the circumferential direction of 83. Each rolling element 44 is sandwiched between a portion of the control surface 83 near the rear end in the second direction R <b> 2 and the inner peripheral surface 41 c of the clutch housing 41. Thereby, the rolling element 44 becomes a wedge, and the rotation (rotation in the second direction R2) of the driven side rotating body 45 is blocked (that is, the rotation of the worm shaft 34 is locked). Therefore, the output shaft 38 is prevented from rotating when the rotary shaft 24 (drive-side rotator 42) is not rotated. In the state (state shown in FIG. 8A) in which the driven-side rotator 45 is disposed at the lock position (position where the rolling element 44 is sandwiched between the driven housing 45 and the clutch housing 41), the state shown in FIG. As described above, each second driven side transmission surface 85 of the driven side connecting portion 82 does not come into contact with each driving side transmission surface 54a of the driving side rotating body 42 in the rotational 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. The That is, each rolling element 44 is sandwiched between a portion of the control surface 83 near the rear end in the first direction R1 and the inner peripheral surface 41c of the clutch housing 41, whereby each rolling element 44 is As a wedge, rotation of the driven-side rotator 45 (rotation in the first direction R1) is blocked (that is, rotation of the worm shaft 34 is locked).

Next, the effect of this embodiment will be described.
(1) Since it is possible to suppress the drive-side rotator 42 and the rolling element holder 62 from being repeatedly separated or abutted in the rotation direction of the drive-side rotator 42 at the start of the rotational drive of the drive-side rotator 42, It is possible to suppress the generation of noise at the start of the rotational drive of the drive side rotator 42. Since the motor 10 includes the clutch 40 in which the generation of noise at the start of the rotational drive of the drive-side rotator 42 is suppressed, noise is generated in the motor 10 at the start of the rotational drive of the rotary shaft 24. Is suppressed.

  (2) The support connecting portion 66 that connects the tip ends in the rotational axis direction of the drive-side rotating body 42 in the paired first and second support portions 64a and 64b is connected to one end surface of the rolling element 44 in the axial direction. Contact from the direction. Therefore, the first and second support parts 64a and 64b that are paired by an impact when the driving side rotating body 42 contacts the rolling element holding part 62 from the rotation direction of the driving side rotating body 42 are elastically deformed and separated from each other. Thus, the support connecting part 66 that suppresses opening in the rotational direction can suppress the rolling element 44 from falling off the rolling element holding part 62 in the axial direction.

  (3) The support connecting portion 66 is provided integrally with the support member 43. Therefore, an increase in the number of parts due to the provision of the support connecting portion 66 can be suppressed. Therefore, it is possible to suppress the generation of noise at the start of the rotational drive of the drive side rotating body 42 without increasing the number of parts.

  (4) The clutch 40 includes a tip end portion in the axial direction of the first support portion 64a of one of the rolling element holding portions 62 of the two rolling element holding portions 62 adjacent to each other in the rotation direction of the support member 43, and the first support. A connecting portion 67 is provided to connect the portion 64 a and the axial end portion of the second support portion 64 b of the other rolling element holding portion 62 adjacent to each other in the rotation direction of the support member 43. That is, in the two rolling element holding parts 62 adjacent to each other in the rotation direction of the driving side rotating body 42, the driving in the two support parts 64a and 64b between the two rolling elements 44 held by the two rolling element holding parts 62 is performed. The front end portions of the side rotating body 42 in the rotation axis direction are connected by a connecting portion 67. In general, due to dimensional errors and assembly errors of the driving side rotating body 42 and the support member 43, all the rolling element releasing parts 57 are simultaneously applied to all the rolling element holding parts 62 at the start of the rotational driving of the driving side rotating body 42. It may be difficult to contact. That is, at the start of the rotational drive of the drive side rotating body 42, when the rolling element releasing part 57 contacts one of the rolling element holding parts 62 from the rotation direction, the other rolling element holding part 62 has no rolling element. The release part 57 may not contact | abut from a rotation direction. Even in such a case, in the clutch 40 of the present embodiment, the pressing force in the rotational direction of the driving side rotating body 42 applied to the one rolling element holding portion 62 is applied to the other rolling element via the connecting portion 67. It is also transmitted to the holding unit 62. That is, a pressing force in the rotational direction of the drive side rotating body 42 is also applied to the other rolling element holding part 62 via the connecting part 67. For this reason, in the two rolling elements 44 held by the two rolling element holding portions 62 adjacent to each other in the rotation direction of the driving side rotating body 42, the clamping between the inner peripheral surface 41c of the clutch housing 41 and the driven side rotating body 45 is released. It is possible to suppress a shift in timing. Therefore, at the start of the rotational driving of the driving side rotating body 42, the holding of each rolling element 44 by the inner peripheral surface 41 c of the clutch housing 41 and the driven side rotating body 45 can be released more smoothly.

Second Embodiment
Hereinafter, a second embodiment of a motor provided with a clutch will be described. In the present embodiment, the same reference numerals are given to the same configurations as the configurations of the first embodiment and the corresponding configurations, and the description thereof is omitted.

  As shown in FIG. 9, the support member 100 of this embodiment is provided in the clutch 40 of the first embodiment instead of the support member 43 of the first embodiment. The support member 100 is configured to include a support connection portion 110 in place of the support connection portion 66 in the support member 43 of the first embodiment.

  The support member 100 is provided with a substantially annular housing recess 101 extending over the two ends of the pair of support portions 64a and 64b in the direction of the rotation axis L5 of the support member 100 and the two connecting portions 67. The housing recess 101 is recessed in the axial direction (direction of the rotation axis L5) and opens in the direction opposite to the ring portion 61.

  Further, in the support member 100, positioning concave portions 102 are provided in two portions that are equiangularly spaced (180 ° intervals) in the circumferential direction (rotating direction of the support member 100) in the portion that becomes the side wall of the housing concave portion 101. . In the present embodiment, the positioning recess 102 is provided at the center portion in the circumferential direction of each connecting portion 67, and penetrates the radially inner side wall 101 a of the housing recess 101 in the radial direction (opposite to the ring portion 61). Direction).

  Further, in the support member 100, locking claws 103 are provided at two portions which are equiangular intervals (180 ° intervals) in the circumferential direction in a portion which becomes the side wall of the housing recess 101. The two locking claws 103 are provided on the radially outer side wall 101b of the housing recess 101, and are located in the center in the circumferential direction of each connecting portion 67 at a position facing the two positioning recesses 102 in the radial direction. Is provided. On both sides in the circumferential direction of each locking claw 103, there are provided a pair of separation grooves 104 that are recessed from the distal end to the proximal end of the side wall 101b and penetrate the side wall 101b in the radial direction. Each locking claw 103 has an extending portion 103a extending from the bottom of the housing recess 101 along the axial direction between the paired separation grooves 104 to the opposite side of the ring portion 61, and a diameter from the tip of the extending portion 103a. And a locking portion 103b protruding inward in the direction. The extending portion 103a can be elastically deformed such that its distal end moves in the radial direction with respect to its proximal end. Moreover, the latching | locking part 103b protrudes in the radial inside rather than the internal peripheral surface of the side wall 101b. In addition, the accommodation recessed part 101 has a part deeply formed between the locking claw 103 and the positioning recessed part 102.

  The support connecting part 110 is made of a material having a mass per unit volume larger than that of the resin material constituting the support member 100. Therefore, the support connecting part 110 has a larger mass per unit volume than the support member 100. In the present embodiment, the support connecting portion 110 is made of a metal material and serves as a weight for the support member 100 (a weight that imparts mass to the support member 100).

  The support connecting portion 110 has an annular plate shape. The axial thickness of the support connecting portion 110 is slightly thinner than the axial depth of the housing recess 101. In addition, the inner diameter of the support connecting portion 110 is substantially equal to the inner diameter of the receiving recess 101 (the outer diameter of the side wall 101a), and the outer diameter of the support connecting portion 110 is substantially the same as the outer diameter of the receiving recess 101 (the inner diameter of the side wall 101b). Are equal.

  The support connecting portion 110 has positioning convex portions 110a that protrude radially inward at two locations that are equiangularly spaced (180 ° intervals) in the circumferential direction. The two positioning projections 110 a are formed so as to correspond to the two positioning recesses 102 provided in the support member 100, and the circumferential width is equal to the circumferential width of the positioning recess 102.

  As shown in FIGS. 9 and 10, such a support connecting portion 110 is configured such that the rolling element 44 is placed between the support portions 64 a and 64 b forming a pair of the support member 100 in the direction of the rotation axis L5 in the support portions 64 a and 64 b. After being inserted from the distal end side, the support member 100 is assembled. The support connecting portion 110 is inserted into the housing recess 101 while elastically deforming the extending portion 103a of the locking claw 103 toward the outer peripheral side. At this time, the support connecting portion 110 is inserted into the housing recess 101 so that the two positioning projections 110a are inserted into the two positioning recesses 102, respectively. When the support connecting portion 110 is inserted into the receiving recess 101 until it abuts against the bottom surface of the receiving recess 101, the extending portion 103a returns to the original shape, and the locking portion 103b is moved from the opposite side to the bottom surface of the receiving recess 101. It abuts on the support connecting portion 110 in the axial direction. Thereby, the support connection part 110 will be in the state by which the drop-off from the support member 100 was suppressed by the latching | locking part 103b, ie, the state assembled | attached to the support member 100. FIG. In the state where the support connecting portion 110 is assembled to the support member 100, the tip portions in the direction of the rotation axis L5 in the first and second support portions 64a and 64b that make a pair are connected by the support connecting portion 110. It becomes a state. Further, in this state, the positioning convex portion 110 a and the positioning concave portion 102 engage in the rotation direction of the support member 100, so that the support member 100 and the support connecting portion 110 rotate relative to each other in the rotation direction of the support member 100. It is suppressed. In the same state, the support connecting portion 110 abuts against one end surface of the rolling element 44 in the axial direction from the axial direction, and suppresses the rolling element 44 from dropping off from the rolling element holding portion 62 in the axial direction.

Next, the operation of this embodiment will be described.
When the rotational drive of the rotary shaft 24 is started by driving the motor unit 20, the rotational drive of the drive side rotating body 42 that rotates integrally with the rotary shaft 24 is started. Along with the rotation of the drive-side rotator 42, the circumferential end on the front side in the rotation direction of each rolling-element release portion 57 of the drive-side rotator 42 comes into contact with each rolling-element holding portion 62 in the rotation direction (see FIG. 7 (a)).

  Here, as shown in FIG. 11, the support connecting portion 110 assembled to the support member 100 is a weight with respect to the support member 100. Accordingly, since the moment of inertia of the support member 100 is increased, the support member 100 that has stopped rotating is unlikely to start rotating around the rotation axis of the drive side rotating body 42. Furthermore, the support connection part 110 connects the front-end | tip parts of the rotation axis L5 direction in the 1st and 2nd support parts 64a and 64b which make a pair in each rolling element holding | maintenance part 62. As shown in FIG. Therefore, at the start of the rotational driving of the driving side rotating body 42, the first and second pairs that are paired by the impact when the rolling element releasing portion 57 contacts the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42. It can suppress that support part 64a, 64b opens in a rotation direction so that it may elastically deform and space apart (refer the dashed-two dotted line in FIG. 11). Therefore, it is suppressed that the support member 100 is thrown away in the rotation direction with respect to the drive side rotating body 42 by the elastic force accompanying the elastic deformation of at least one of the first and second support portions 64a and 64b. . For these reasons, the support member 100 is driven by an impact when the rolling element releasing portion 57 contacts the rolling element holding portion 62 from the rotational 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 side rotating body 42 is skipped in the rotation direction and rotates ahead of the driving side rotating body 42. Therefore, after the rolling element releasing portion 57 contacts 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 100 are likely to rotate integrally. And each rolling element release part 57 contacted to each rolling element holding part 62 in the rotation direction presses rolling element 44 in the rotation direction of drive side rotating body 42 via each rolling element holding part 62, The holding 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.

  Note that the inner peripheral surface 41c of the clutch housing 41 and the driven-side rotating body 45 are pressed by the driving-side rotating body 42 (the rolling-element releasing section 57) pressing the rolling-element holding section 62 in the rotation direction of the driving-side rotating body 42. After the holding of the rolling element 44 by the release is released, the driven side rotating body 45 may try to clamp the rolling element 44 again between the inner peripheral surface 41 c of the clutch housing 41. However, in the present embodiment, the support-side rotating body 42 and the support member 100 are easily rotated integrally by suppressing the support member 100 from rotating before the driving-side rotating body 42. . Therefore, when the driving side rotating body 42 and the support member 100 rotate integrally, the holding of the rolling element 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 effects as (1), (2), and (4) of the first embodiment, the following effects can be achieved.
(1) The support connecting portion 110 is formed separately from the support member 100 and is assembled to the support member 100. Therefore, the support connecting portion 110 can be assembled to the support member 100 after the rolling element 44 is assembled between the pair of support portions 64a and 64b. In this case, the rolling element 44 can be inserted between the support parts 64a and 64b that form a pair from the front end side of the support parts 64a and 64b in the direction of the rotation axis L5 (the same as the rotation axis direction of the drive side rotating body 42). Therefore, the rolling element 44 can be easily assembled to the support member 100.

  (2) The support connecting portion 110 is a weight with respect to the support member 100. Therefore, since the moment of inertia of the support member 100 is increased, the support member 100 that has stopped rotating does not easily start to rotate around the rotation axis of the drive side rotating body 42. Therefore, at the start of the rotational driving of the driving side rotating body 42, the support member 100 is driven by the impact when the rolling element releasing portion 57 contacts the rolling element holding portion 62 from the rotation direction of the driving side rotating body 42. It is possible to further suppress the rotation in the rotational direction of 42 and the rotation ahead of the drive-side rotator 42. Therefore, after the rolling element releasing part 57 contacts the rolling element holding part 62 from the rotation direction of the driving side rotating body 42, the driving side rotating body 42 and the support member 100 are more likely to rotate integrally. As a result, it is possible to further suppress the drive-side rotator 42 and the rolling element holder 62 from being repeatedly separated or abutted in the rotation direction of the drive-side rotator 42 at the start of the rotational drive of the drive-side rotator 42. Further, it is possible to further suppress the generation of noise at the start of the rotational driving of the driving side rotating body 42.

In addition, you may change each said embodiment as follows.
In each of the above embodiments, the connecting portion 67 is provided integrally with the first and second support portions 64a and 64b. However, the connecting portion 67 may be provided separately from the support members 43 and 100 and assembled to the support members 43 and 100. Further, the clutch 40 does not necessarily have to include the connecting portion 67.

  In the second embodiment, the support connecting portion 110 is made of a metal material that has a larger mass per unit volume than the resin material that forms the support member 100. However, the material which comprises the support connection part 110 is not restricted to this. For example, the support connecting portion 110 may be made of the same resin material as the support member 100. Further, for example, the support connecting portion 110 may be a resin material different from the resin material constituting the support member 100 and may be made of a resin material having the same or small mass per unit volume. Even if it does in this way, the effect similar to (1) of the said 1st Embodiment can be acquired. Further, for example, when the support connecting portion 110 is formed of a resin material different from the resin material constituting the support member 100 and having a larger mass per unit volume than the resin material constituting the support member 100, the above-mentioned The same effect as in the second embodiment can be obtained. Further, for example, the support connecting portion 110 may be configured by a weight made of a metal material and a holding member made of a resin material that holds the weight.

  In the second embodiment, the support connecting portion 110 has an annular shape. However, the shape of the support connecting portion 110 is not limited to this. The support connecting portion 110 is formed separately from the support member 100 and assembled to the support member 100, and the tip portions of the drive side rotating body 42 in the rotation axis direction of the first and second support portions 64a and 64b that form a pair are supported. What is necessary is just to connect. For example, the support connecting portion 110 is provided for each of the rolling element holding portions 62, and connects the distal end portions in the rotational axis direction of the drive side rotating body 42 in the first and second support portions 64a and 64b that make a pair. It may be an arcuate shape.

  In the first embodiment, the support connecting portion 66 has a flat plate shape having an arc shape having a width substantially equal to the radial width of the first and second support portions 64a and 64b. However, the shape of the support connecting portion 66 is not limited to this. The support connecting portion 66 may have a shape that connects the tip portions in the rotation axis direction of the drive side rotating body 42 of the paired first and second support portions 64a and 64b. For example, the support connecting portion 66 may have an arcuate plate shape whose width in the radial direction is narrower than that of the first and second support portions 64a and 64b when viewed from the axial direction. Further, for example, the support connecting portion 66 may extend linearly between the paired first and second support portions 64a and 64b.

  The support connecting portions 66 and 110 do not necessarily have to be provided at a position where the support connecting portions 66 and 110 are in contact with one end surface of the rolling element 44 in the axial direction. In this case, it is preferable that a configuration for preventing the rolling element 44 from coming off from the rolling element holding part 62 in the axial direction is provided separately from the support connecting parts 66 and 110.

  In each of the above embodiments, each of the support members 43 and 100 includes two rolling element holding portions 62 that hold the rolling elements 44. However, the number of rolling element holding portions 62 included in each support member 43, 100 is not limited to two, and may be one or three or more. The number of rolling element holding portions 62 may be set according to the number of rolling elements 44 provided in the clutch 40. Incidentally, at least one rolling element 44 may be disposed between the inner peripheral surface 41 c of the clutch housing 41 and the driven side rotating body 45.

  In each of the above embodiments, the shapes of the clutch housing 41, the driving side rotating body 42, the support members 43 and 100, the rolling element 44, and the driven side rotating body 45 constituting the clutch 40 are not necessarily the shapes of the above respective embodiments. May be. For example, the driving side rotating body 42 may be formed integrally with the rotating shaft 24. Further, for example, the driven-side rotator 45 may be provided separately from the worm shaft 34 and assembled so as to be rotatable integrally with the worm shaft 34. For example, the rolling element 44 may have a columnar shape or a spherical shape.

In each of the above embodiments, the motor 10 is used as a drive source for the power window device, but may be used as a drive source for other devices.
In each of the above embodiments, the clutch 40 is provided in the motor 10 and connects the rotary shaft 24 and the worm shaft 34 of the speed reduction mechanism 32. However, the clutch 40 may be provided in a device other than the motor 10 and connect a rotating shaft that is rotationally driven to a driven shaft that is transmitted with the rotational driving force of the rotating shaft.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 20 ... Motor part, 24 ... Rotating shaft, 30 ... Output part, 34 ... Worm shaft as driven shaft, 40 ... Clutch, 41 ... Clutch housing, 41c ... Inner peripheral surface, 42 ... Drive side rotating body, 43, 100 ... support member, 44 ... rolling element, 45 ... driven side rotating body, 62 ... rolling element holding part, 64a ... first support part, 64b ... second support part, 66, 110 ... support connecting part, 67 ... Connection part, L4, L5 ... Rotation axis of support member.

Claims (6)

An annular clutch housing;
A drive-side rotating body that is rotationally driven;
A driven-side rotating body that is inserted inside the clutch housing and to which a rotational driving force is transmitted from the driving-side rotating body;
The driven housing is disposed between the inner peripheral surface of the clutch housing and the driven side rotating body, and is sandwiched between the clutch housing and the driven side rotating body when the driving side rotating body is not rotated. A rolling element that prevents rotation of the side rotating body;
An inner peripheral surface of the clutch housing and the driven side rotation are provided with a pair of first and second support portions protruding in the rotation axis direction of the driving side rotating body on both sides of the rolling body in the rotating direction of the driving side rotating body. A support member that has a rolling element holding portion that holds the rolling element between the body and the drive side rotating body, and is rotatable about a rotation axis of the driving side rotating body;
With
At the start of rotational driving of the driving side rotating body, the driving side rotating body abuts on the rolling element holding part from the rotating direction and presses the rolling element in the rotating direction via the rolling element holding part. A clutch that releases the rolling body between the clutch housing and the driven-side rotating body;
A clutch comprising a support coupling portion that couples the distal end portions in the rotational axis direction of the drive-side rotator in the first and second support portions forming a pair. The clutch according to claim 1, wherein
The clutch, wherein the support connecting portion is provided integrally with the support member. The clutch according to claim 1, wherein
The clutch, wherein the support connecting portion is formed separately from the support member and is assembled to the support member. The clutch according to claim 3,
The clutch, wherein the support connecting portion is a weight with respect to the support member. In the clutch according to any one of claims 1 to 4,
The support member includes a plurality of the rolling element holding portions each holding the rolling elements arranged in a rotation direction of the support member,
A tip end portion in the rotational axis direction of the drive side rotating body in the first support section of one of the rolling element holding sections among the two rolling element holding sections adjacent to each other in the rotation direction of the support member, and the first support And a connecting portion that connects the tip end portion in the rotational axis direction of the drive side rotating body in the second support portion of the other rolling element holding portion adjacent to the rotating direction of the support member. To clutch. A motor unit having a rotary shaft that is driven to rotate;
The clutch according to any one of claims 1 to 5, comprising the driving side rotating body that rotates integrally with the rotating shaft.
An output unit that has a driven shaft that rotates integrally with the driven-side rotator, and that outputs a rotational driving force transmitted to the driven shaft;
A motor comprising: