JP2016040488A - clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch which is reducible in size in a radial direction.SOLUTION: A clutch 3 comprises: an annular clutch housing 31; a drive-side rotating body 32 which is rotationally driven; and a driven-side rotating body 35 which has a control face 73 oriented toward the outside in a radial direction at the inside of the clutch housing 31, and to which a rotating drive force of the drive-side rotating body 32 is transmitted at the rotation of the drive-side rotating body 32. Between an internal peripheral face of the clutch housing 31 and the control face 73, there is arranged a rolling body 34 which rotates together with the driven-side rotating body 35 at the rotational drive of the drive-side rotating body 32, is sandwiched by the internal peripheral face of the clutch housing 31 and the control face 73 at the non-rotational drive of the drive-side rotating body 32, and prohibits the rotation of the driven-side rotating body 35. Then, the driven-side rotating body 35 comprises a driven-side connecting part 72 which is integrally and rotationally connected to the drive-side rotating body 32, and the control face 73 and the driven-side connecting part 72 are separated in an axial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a clutch that operates so as to transmit a rotational driving force of a driving shaft to a driven shaft while not transmitting a rotational force from the driven shaft to the driving shaft.

  2. Description of the Related Art Conventionally, a motor used as a drive source for a power window device or the like includes a rotary shaft that is rotationally driven and a worm shaft of a speed reduction mechanism that decelerates the rotational driving force transmitted from the rotary shaft. Some of them are connected via a clutch that operates so as not to transmit the rotational force from the worm shaft to the rotating shaft while transmitting the force to the worm shaft.

  For example, in a clutch provided in a motor described in Patent Document 1, a driving side rotating body that rotates integrally with a rotating shaft, a driven side rotating body that rotates integrally with a worm shaft, and a rolling element are disposed inside an annular clutch housing. Is formed. The driven-side rotator includes a shaft portion and an engagement convex portion protruding radially outward from the shaft portion, and the distance from the clutch housing changes in the rotational direction on the radially outer end surface of the engagement convex portion. A control surface is formed. The rolling elements are disposed between the clutch housing and the control surface. When the drive-side rotator is rotated by the rotational drive of the rotation shaft, the drive-side rotator is engaged with the engagement convex portion in the circumferential direction. Therefore, the rotational driving force of the rotating shaft is transmitted to the worm shaft through the driving side rotating body and the driven side rotating body. On the other hand, when the rotating shaft is non-rotatingly driven, the rolling element is sandwiched between the control surface and the clutch housing, thereby preventing the driven side rotating body from rotating. Therefore, the rotational force of the worm shaft is not transmitted to the rotational shaft.

JP 2002-39223 A

  However, in the clutch disclosed in Patent Document 1, the engagement convex portion of the driven side rotating body that engages with the driving side rotating body when the rotating shaft is driven to rotate and clamps the rolling element together with the clutch housing when the rotating shaft is not rotated is provided on the shaft. It has a shape that protrudes radially outward from the portion. And there existed a problem that a clutch will be enlarged radially by the engagement convex part which protruded to radial direction outer side.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a clutch that can be reduced in size in the radial direction.

  A clutch that solves the above-described problem has an annular clutch housing, a drive-side rotator that is rotationally driven, and a control surface that faces radially outward inside the clutch housing, and the drive side rotator rotates when the drive-side rotator rotates. A driven-side rotating body to which the rotational driving force of the side-rotating body is transmitted, and the inner-side surface of the clutch housing and the control surface, and when the driving-side rotating body is driven to rotate, together with the driven-side rotating body A rotating body that rotates and is held between an inner peripheral surface of the clutch housing and the control surface when the driving side rotating body is not rotated, and prevents rotation of the driven side rotating body. The driven-side rotating body includes a driven-side connecting portion that is connected to the driving-side rotating body so as to be integrally rotatable, and the driven-side connecting portion has a first driven-side transmission surface and a second driven-side transmission surface. How to rotate It is formed in accordance with, the first driven transmission surface and the second driven transmission surface and said control surface is formed continuously in the axial direction.

In the clutch described above, the driven-side coupling portion has a substantially elliptical cross-sectional shape orthogonal to the axial direction.
In the clutch described above, the driving-side rotator includes a driven shaft insertion hole that is in an insertion state in which the driven-side coupling portion can integrally rotate, and the driven-side coupling portion is formed to be narrower than the driven shaft insertion hole. Has been.

  According to the present invention, it is possible to provide a clutch that can be reduced in size in the radial direction.

Sectional drawing of the motor in 1st Embodiment. The partial expanded sectional view of the motor in a 1st embodiment. The disassembled perspective view of the clutch of 1st Embodiment. The perspective view of the drive side rotary body of 1st Embodiment. The partial expanded sectional view of the clutch of 1st Embodiment. (A) is sectional drawing (AA sectional drawing in FIG. 2) of the clutch of 1st Embodiment, (b) is sectional drawing (BB sectional drawing in FIG. 2) of the clutch of 1st Embodiment. (A) is sectional drawing of the clutch of 1st Embodiment, (b) is sectional drawing of the clutch of 1st Embodiment. (A) is sectional drawing of the clutch of 1st Embodiment, (b) is sectional drawing of the clutch of 1st Embodiment. The partial expanded sectional view of the motor in 2nd Embodiment. (A) is the elements on larger scale of the clutch of 2nd Embodiment (CC sectional drawing in FIG. 9), (b) is the elements on larger scale of the clutch of 2nd Embodiment. Sectional drawing (DD sectional drawing in FIG. 9) of the drive side rotary body of 2nd Embodiment.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
The motor of this embodiment shown in FIG. 1 is used as a drive source of a power window device, for example. This motor includes a motor unit 1, a speed reduction unit 2, and a clutch 3.

  A pair of magnets 5 are fixed to an inner peripheral surface of a bottomed cylindrical yoke housing (hereinafter simply referred to as a yoke) 4 constituting the motor unit 1 so as to face each other. A child 6 is arranged. The armature 6 includes a rotation shaft 7 (drive shaft) disposed at the center of the yoke 4. A base end portion (upper end portion in FIG. 1) of the rotating shaft 7 is pivotally supported by a bearing 8 provided at the center of the bottom of the yoke 4, and a cylindrical portion is provided at a tip side of the rotating shaft 7. A commutator 9 is fixed. In addition, a connecting portion 7a having a two-sided width shape that is chamfered in parallel from a cylindrical shape is formed at the tip of the rotating shaft 7, and the tip of the connecting portion 7a has a curved surface shape (part of a spherical surface). Yes.

  A flange portion 4 a extending outward is formed at the opening of the yoke 4, and a brush holder 10 is fitted into the opening of the yoke 4. The brush holder 10 is formed by integrally forming a holder main body 10 a having a shape for closing the opening of the yoke 4 and a connector portion 10 b protruding outward in the radial direction of the yoke 4. The holder main body 10a holds a pair of brushes 11 that are connected to the connector portion 10b by wires (not shown) and that are in sliding contact with the commutator 9. A bearing 12 is provided at the center of the holder main body 10a, and the bearing 12 pivotally supports a portion of the rotating shaft 7 between the commutator 9 and the connecting portion 7a. When the external power supplied to the brush 11 via the connector portion 10b is supplied to the armature 6 via the commutator 9, the armature 6 (rotating shaft 7) is driven to rotate, that is, the motor portion. 1 is rotationally driven.

  The speed reduction portion 2 is formed by housing a speed reduction mechanism 22 and the like in a resin gear housing 21. The gear housing 21 includes a fixing portion 21 a for fixing the gear housing 21 to the motor portion 1 at a portion (an upper end portion in FIG. 1) facing the motor portion 1 in the axial direction. The fixing portion 21 a has an outer shape similar to the outer shape of the flange portion 4 a of the yoke 4, and a fitting recess 21 b that opens to the inside of the yoke 4 is formed in the fixing portion 21 a. Then, in a state where the holder main body 10a of the brush holder 10 is fitted in the fitting recess 21b, the fixing portion 21a and the flange portion 4a in contact with the fixing portion 21a are fixed by the screw 23, The yoke 4 is fixed to the gear housing 21, and the motor unit 1 and the speed reduction unit 2 are integrated.

  In the gear housing 21, a clutch housing recess 21c is provided in the center of the bottom of the fitting recess 21b in the axial direction, and the worm shaft housing extends along the axial direction of the rotary shaft 7 from the center of the bottom of the clutch housing recess 21c. The portion 21d is recessed. Further, in the gear housing 21, a wheel accommodating portion 21e is recessed on the side (right side in FIG. 1) of the worm shaft accommodating portion 21d. The wheel housing portion 21e and the worm shaft housing portion 21d are connected at the central portion in the axial direction (longitudinal direction) of the worm shaft housing portion 21d.

  A substantially cylindrical worm shaft 24 is accommodated in the worm shaft accommodating portion 21d. The worm shaft 24 is made of a metal material, and a screw-like worm portion 24a is formed in the central portion in the axial direction. The worm shaft 24 is axially supported at both ends in the axial direction by a pair of metal and cylindrical bearings 25 and 26 arranged at both ends in the axial direction of the worm shaft accommodating portion 21d. The worm shaft 24 in the worm shaft housing portion 21d is supported by the bearings 25 and 26 so as to be arranged coaxially with the rotary shaft 7, that is, the central axis L1 of the rotary shaft 7 and the central axis of the worm shaft 24. It arrange | positions so that L2 may be on a straight line (refer FIG. 2).

  A disc-shaped worm wheel 27 that meshes with the worm portion 24a of the worm shaft 24 is rotatably accommodated in the wheel accommodating portion 21e. The worm wheel 27 constitutes the speed reduction mechanism 22 together with the worm shaft 24. In addition, an output shaft 28 that rotates integrally with the worm wheel 27 extends in the axial direction of the worm wheel 27 (in the direction perpendicular to the paper surface in FIG. 1). . A known window regulator (not shown) for raising and lowering the window glass of the vehicle is drivingly connected to the output shaft 28.

  The clutch 3 for connecting the rotary shaft 7 and the worm shaft 24 is accommodated in the clutch accommodating recess 21c. As shown in FIGS. 2 and 3, the clutch 3 includes a clutch housing 31, a driving side rotating body 32, a support member 33, a rolling element 34, and a driven side rotating body 35.

  The clutch housing 31 has a cylindrical shape, and a hook-shaped fixed flange portion 31 a extending radially outward is formed at one end portion in the axial direction of the clutch housing 31. The outer diameter of the cylindrical portion of the clutch housing 31 is formed substantially equal to the inner diameter of the clutch housing recess 21c, and the outer diameter of the fixed flange portion 31a is formed larger than the inner diameter of the clutch housing recess 21c. In addition, fixed recesses 31b are formed in the fixed flange portion 31a at four locations that are equiangularly spaced in the circumferential direction. The fixed concave portion 31b is formed so as to penetrate the fixed flange portion 31a in the axial direction and is opened radially outward.

  As shown in FIG. 2, the clutch housing 31 is inserted into the clutch housing recess 21c until the fixed flange portion 31a contacts the bottom surface of the fitting recess 21b, and is fixed to the gear housing 21 at the fixed flange portion 31a. Has been. Specifically, on the outer peripheral edge of the opening of the clutch housing recess 21c on the bottom surface of the fitting recess 21b, fixed projections 21f projecting in the axial direction are formed at four positions that are equiangularly spaced in the circumferential direction. ing. These fixing protrusions 21f are formed integrally with the resin gear housing 21, and are formed longer in the axial direction than the thickness of the fixing flange portion 31a. In addition, the four fixing protrusions 21f are inserted into the four fixing recesses 31b of the fixing flange portion 31a that is in contact with the bottom surface of the fitting recess 21b, respectively, thereby passing through the fixing flange portion 31a in the axial direction. The tip of each fixing projection 21f is processed by heat caulking. The clutch housing 31 is fixed to the gear housing 21 so as not to move in the axial direction and to rotate in the circumferential direction by the processed fixing protrusion 21f. The clutch housing 31 fixed to the gear housing 21 is disposed coaxially with the rotary shaft 7 and the worm shaft 24.

  The drive shaft connecting portion 41 constituting the drive side rotating body 32 has a substantially cylindrical shape whose outer diameter is smaller than the inner diameter of the clutch housing 31, and the drive shaft connecting portion 41 at the center in the radial direction. A drive shaft insertion hole 42 penetrating the shaft in the axial direction is formed. The drive shaft insertion hole 42 has a two-surface width shape corresponding to the outer diameter shape of the connecting portion 7a of the rotary shaft 7. That is, as shown in FIG. 6B, the inner peripheral surface of the drive shaft insertion hole 42 is a pair of flat surfaces 42a that are spaced apart in the radial direction and parallel to each other and parallel to the axial direction, and both ends of these flat surfaces 42a. It is comprised from the two connection surfaces 42b which connect parts. Therefore, the drive shaft insertion hole 42 has a substantially track shape in which the direction parallel to the plane 42a is the longitudinal direction and the direction orthogonal to the plane 42a is the short direction. As shown in FIG. 2, when the connecting portion 7 a is press-fitted into the drive shaft insertion hole 42, the drive side rotating body 32 is connected to the rotary shaft 7 so as to be integrally rotatable. The rotating shaft 7 and the drive side rotating body 32 connected to the rotating shaft 7 are coaxial (that is, the central axes coincide with each other).

  Further, as shown in FIGS. 2 and 4, a drive side connecting portion 43 is integrally formed at the axial end portion (lower end portion in FIG. 2) of the drive shaft connecting portion 41 on the speed reducing portion 2 side. . The drive side connecting portion 43 protrudes along the axial direction from the axial end of the drive shaft connecting portion 41 on the speed reducing portion 2 side to the speed reducing portion 2 side, and has a substantially square column shape. The outer shape of the drive side connecting portion 43 is formed larger than the drive shaft insertion hole 42, and the driven side connection portion 43 is formed with a driven shaft insertion hole 44 that penetrates the drive side connection portion 43 in the axial direction. Has been. As shown in FIG. 6B, the inner peripheral surface of the driven shaft insertion hole 44 has a pair of drive-side transmission surfaces 44a that are spaced apart from each other in the radial direction and parallel to each other, and both end portions of these drive-side transmission surfaces 44a. It is comprised from the two connection surfaces 44b which connect. Each drive-side transmission surface 44a has a flat shape parallel to the axial direction, and each connection surface 44b has an arcuate curved shape. Accordingly, the driven shaft insertion hole 44 has a substantially track shape (two directions) when viewed from the axial direction, in which the direction parallel to the drive side transmission surface 44a is the longitudinal direction and the direction orthogonal to the drive side transmission surface 44a is the short direction. (Width shape). In addition, the center axis of the driven shaft insertion hole 44 coincides with the center axis of the drive shaft insertion hole 42, and the driven shaft insertion hole 44 rotates in the rotational direction of the drive side rotating body 32 (that is, the drive shaft insertion hole 42 (ie The same as the rotation direction of the rotary shaft 7). That is, the flat surface 42a of the drive shaft insertion hole 42 and the drive side transmission surface 44a of the driven shaft insertion hole 44 are the center axis of the drive side rotating body 32 (the center axis of the rotation shaft 7 when the clutch 3 is assembled to the motor). 90 ° with respect to the same as L1). Therefore, when the drive side rotating body 32 is viewed from the axial direction, the center line M1 of the drive shaft insertion hole 42 extending in the longitudinal direction through the center in the short direction of the drive shaft insertion hole 42 is the short side of the driven shaft insertion hole 44. It is orthogonal to the center line M2 of the driven shaft insertion hole 44 extending in the longitudinal direction through the center of the direction.

  Each drive-side transmission surface 44a is provided with a buffer member 45 made of an elastic material such as a rubber material. The buffer member 45 is formed at two locations spaced apart in the direction of the center line M2 of the driven shaft insertion hole 44 on each drive side transmission surface 44a, and from one end in the axial direction of the drive side transmission surface 44a along the axial direction. It extends to the end (see FIG. 4). Each buffer member 45 slightly protrudes inside the driven shaft insertion hole 44 from the drive side transmission surface 44a. In addition, the position where the buffer member 45 is formed on each driving side transmission surface 44a is a position corresponding to a position where first and second driven side transmission surfaces 74 and 75, which will be described later, come into contact with these driving side transmission surfaces 44a. ing.

  Each connecting surface 44b of the driven shaft insertion hole 44 is provided with an elastic member 46 made of an elastic material such as a rubber material. The elastic member 46 is formed at the center in the circumferential direction of each connecting surface 44b, and extends from one end of the connecting surface 44b in the axial direction to the other end along the axial direction (see FIG. 4). And each elastic member 46 protrudes inside the driven shaft insertion hole 44 rather than the connection surface 44b.

  As shown in FIG. 2 and FIG. 4, the base end portion of the drive side connecting portion 43 and the portion adjacent to the axial end portion of the drive shaft connecting portion 41 on the speed reducing portion 2 side are radially outward. A substantially annular flange 47 (abutting portion) extending in the direction is integrally formed. The outer diameter of the flange 47 is formed to be slightly larger than the inner diameter of the clutch housing 31. Further, in the flange portion 47, visual recognition holes 48 penetrating the flange portion 47 in the axial direction are formed on both sides of the driven shaft insertion hole 44 in the short direction (a direction perpendicular to the center line M2 in FIG. 6B). Has been.

  As shown in FIG. 4, on the drive-side connecting portion 43, on the both sides in the longitudinal direction of the driven shaft insertion hole 44 (same as the direction of the center line M2 in FIG. 6B), that is, on the radially outer side of the connecting surface 44b. A moving body releasing portion 49 is formed integrally with the driving side connecting portion 43, respectively. The two rolling element releasing portions 49 are formed at intervals of 180 ° in the circumferential direction, and extend to the opposite side of the drive shaft connecting portion 41 along the axial direction. Further, shock absorbing members 50 made of an elastic material such as a rubber material are integrally provided at both ends in the circumferential direction of each rolling element releasing portion 49. The shock absorbing member 50, the buffer member 45, and the elastic member 46 are integrally formed with a portion made of a resin material other than the shock absorbing member 50, the buffer member 45, and the elastic member 46 in the driving side rotating body 32. Yes.

  Further, a driving side engaging portion 51 is formed integrally with the rolling element releasing portion 49 at the tip of each rolling element releasing portion 49. The side surface on the radially outer side of each drive side engaging portion 51 is located on the radially inner side with respect to the radially outer side surface of the rolling element releasing portion 49. An engagement groove 51a extending in the circumferential direction is formed on a radially outer side surface of each drive-side engagement portion 51. The engagement groove 51a is formed by recessing the radially outer side surface of the drive-side engagement portion 51 radially inward and is open radially outward. Further, the engagement groove 51 a extends along the circumferential direction from one end to the other end in the circumferential direction of the drive side engagement portion 51. Further, the engaging groove 51a is curved in an arc shape having a center of curvature on the central axis of the driving side rotator 32 (same as the central axis L1 of the rotary shaft 7 when the clutch 3 is assembled to the motor). . As shown in FIG. 5, in the cross-sectional shape orthogonal to the longitudinal direction of the engaging groove 51a, the inner peripheral surface of the engaging groove 51a has an arc shape that swells radially inward.

  As shown in FIG. 2, in the drive side rotating body 32 as described above, the drive shaft connecting portion 41 and the drive side connecting portion 43 are outside the clutch housing 31 (specifically, between the clutch housing 31 and the brush holder 10). The two rolling element releasing portions 49 are inserted into the clutch housing 31. Then, as shown in FIG. 6A, each rolling element release portion 49 arranged inside the clutch housing 31 has a radially outer side surface facing the inner peripheral surface of the clutch housing 31 in the radial direction.

  As shown in FIGS. 2 and 3, the support member 33 is formed of a resin material. The annular ring portion 61 constituting the support member 33 has an outer diameter that is equal to the outer diameter of the flange portion 47 of the drive side rotating body 32. On both end surfaces of the ring portion 61 in the axial direction, contact protrusions 62 that protrude in the axial direction and extend in the circumferential direction are formed. In addition, in the ring portion 61 at two locations spaced apart in the circumferential direction (in this embodiment, two locations having an interval of 180 °), an inwardly extending portion 63 that extends radially inward from the ring portion 61 is formed. Yes. A pair of roller supports 64 are integrally formed with each inwardly extending portion 63. The pair of roller supports 64 provided in each inward extending portion 63 extend along the axial direction from the inward extending portion 63 and are spaced apart from each other in the circumferential direction. Further, the tip portions of the two pairs of roller supports 64 are connected by a reinforcing portion 65 extending in an arc shape, and the tip portions of the roller supports 64 protrude between the pair of roller supports 64 (project in the circumferential direction). ) Holding claws 66 are formed.

  Furthermore, an extending portion 67 extending toward the ring portion 61 along the axial direction is formed at the central portion in the circumferential direction of each reinforcing portion 65. The extending portion 67 has an arcuate plate shape that is curved along the reinforcing portion 65, and a support-side engaging portion 68 that protrudes inward in the radial direction is formed on the extending portion 67 with the extending portion 67. It is integrally formed. The support side engaging portion 68 is curved in an arc shape along the reinforcing portion 65. Further, as shown in FIG. 5, the front end surface of the support side engaging portion 68 is in the longitudinal direction of the support side engaging portion 68 so as to correspond to the engaging groove 51 a formed in the drive side rotating body 32. It has an arc shape that swells radially inward in a cross-sectional shape that is orthogonal.

  As shown in FIG. 3, the rolling elements 34 are inserted into the two pairs of roller supports 64 of the support member 33. Each rolling element 34 has a cylindrical shape. The two rolling elements 34 are arranged between the paired roller supports 64 so that they can be rotated by the support member 33 (rotatable with the central axis of the rolling element 34 as the center of rotation) and substantially in parallel. It is held at equiangular intervals (180 ° intervals in this embodiment). Each rolling element 34 is restricted from moving in the axial direction relative to the support member by the inwardly extending portion 63 and the holding claw 66.

  The support member 33 holding the two rolling elements 34 is assembled to the driving side rotating body 32 by the engagement of the two support side engaging portions 68 and the two driving side engaging portions 51. The two support-side engagement portions 68 and the two drive-side engagement portions 51 are formed by inserting the two rolling element release portions 49 of the drive-side rotating body 32 into the ring portion 61 and then supporting the two support-side engagement portions. The tip portions of the portions 68 are engaged with each other by engaging with the two engaging grooves 51a (see FIG. 5). Further, by inserting the two rolling element releasing portions 49 of the driving side rotating body 32 inside the ring portion 61, the rolling element releasing portions 49 are respectively disposed between the two pairs of roller supports 64 (FIG. 6A). )reference). The drive side engagement portion 51 and the support side engagement portion 68 engaged with each other prevent relative movement in the axial direction between the support member 33 and the drive side rotating body 32. Furthermore, the drive side rotating body 32 and the support member 33 can be relatively rotated in the circumferential direction while sliding the tip end surface of the support side engaging portion 68 and the inner peripheral surface of the engaging groove 51a. Then, as shown in FIG. 6A, when the driving side rotating body 32 rotates with respect to the support member 33, each rolling element releasing portion 49 rotates from the rotating direction of the driving side rotating body 32 (from the circumferential direction). It is possible to contact the roller support 64 located on the front side in the direction. Further, as shown in FIG. 2, in the state where the support member 33 is assembled to the drive side rotating body 32, the ring portion 61 and the flange portion 47 face each other in the axial direction, and the flange portion 47 in the ring portion 61. The abutting protrusion 62 formed on the axial end surface facing the axial direction abuts the flange 47 from the axial direction. Further, the rolling element 34 is exposed to the drive shaft connecting portion 41 side from the visual recognition hole 48 formed in the flange portion 47.

  2 and 6A, in the support member 33, the roller support 64 into which the rolling element 34 is inserted is inserted into the clutch housing 31 together with the rolling element releasing portion 49, and the ring The portion 61 is disposed between the clutch housing 31 and the flange portion 47 outside the clutch housing 31. Further, the contact protrusion 62 formed on the axial end surface of the ring portion 61 facing the clutch housing 31 in the axial direction is in contact with the axial end surface of the clutch housing 31 on the opening side of the clutch housing recess 21c. It touches. In addition, the outer circumferential surface of the rolling element 34 disposed inside the clutch housing 31 can contact the inner circumferential surface of the clutch housing 31.

  As shown in FIG. 2, the driven-side rotator 35 is formed integrally with the base end portion of the worm shaft 24. The driven-side rotator 35 includes a driven-side control unit 71 and a driven-side connecting unit 72 that are arranged in the axial direction.

  The driven-side control unit 71 is formed integrally with the worm shaft 24 at the base end portion of the worm shaft 24 and has a column shape extending in the axial direction of the worm shaft 24. The driven-side control unit 71 has a central axis that coincides with the central axis L2 of the worm shaft 24, and is formed coaxially with the worm shaft 24. Further, the outer diameter of the driven side control unit 71 is set to a value equal to or smaller than the maximum outer diameter of the worm shaft 24. In the present embodiment, the outer diameter of the portion of the worm shaft 24 supported by the bearing 25 is It is set to an equal value. As shown in FIG. 6A, a pair of control surfaces 73 are formed on the outer peripheral surface of the driven side control unit 71. Each control surface 73 is formed at two locations that are equiangularly spaced in the circumferential direction (180 ° intervals in the present embodiment) on the outer circumferential surface of the driven-side control unit 71 and has a planar shape that is parallel to the axial direction. Yes. Further, the pair of control surfaces 73 are parallel to each other, and the length of each control surface 73 in the axial direction is longer than the length of the rolling element 34 in the axial direction. Further, the two control surfaces 73 are positioned on the inner side (in the radial direction) of the outer diameter of the portion of the worm shaft 24 that is supported by the bearing 25.

  As shown in FIG. 2, the driven side connecting portion 72 is integrally formed at the axial end of the driven side control portion 71 opposite to the worm shaft 24. The driven side connecting portion 72 and the driven side control portion 71 are formed continuously in the axial direction. That is, the driven side connecting portion 72 and the driven side control portion 71 are arranged adjacent to each other in the axial direction, and are not spaced apart in the axial direction because no other part is interposed therebetween. The driven side connecting portion 72 has a column shape extending in the axial direction of the worm shaft 24, and its central axis coincides with the central axis L <b> 2 of the worm shaft 24, and is formed coaxially with the worm shaft 24. Further, the axial length of the driven side connecting portion 72 is slightly longer than the axial length of the driven shaft insertion hole 44 formed in the driving side connecting portion 43. Further, the outer diameter of the driven side connecting portion 72 is set to a value equal to or smaller than the maximum outer diameter of the worm shaft 24. In the present embodiment, the outer diameter of the portion of the worm shaft 24 that is supported by the bearing 25 is larger. Is set to a small value (that is, a value smaller than the outer diameter of the driven-side control unit 71). Further, the driven side connecting portion 72 is formed slightly narrower than the driven shaft insertion hole 44.

  As shown in FIGS. 6A and 6B, the driven-side connecting portion 72 has a substantially elliptical cross-sectional shape orthogonal to the axial direction, and the cross-sectional shape is formed constant in the axial direction. ing. When the driven side connecting portion 72 is viewed from the axial direction, the longitudinal direction of the driven side connecting portion 72 is parallel to the control surface 73, and the short side direction of the driven side connecting portion 72 (driven side connection). The direction perpendicular to the longitudinal direction of the portion 72 is a direction perpendicular to the control surface 73. The axial length of the driven side connecting portion 72 is slightly longer than the axial length of the drive side transmission surface 44a.

  Further, as shown in FIG. 6B, a pair of first driven side transmission surfaces 74 and a pair of second driven side transmission surfaces 75 are formed on the outer peripheral surface of the driven side coupling portion 72. Of the two first driven side transmission surfaces 74 forming a pair, one first driven side transmission surface 74 is formed on the opposite side of 180 ° with respect to the other first driven side transmission surface 74. The two first driven side transmission surfaces 74 are each parallel to the axial direction and are parallel to each other. Further, the interval between the two first driven side transmission surfaces 74 is formed to be equal to the interval between the pair of drive side transmission surfaces 44 a provided in the driven shaft insertion hole 44 of the driving side rotating body 32. The second driven side transmission surface 75 is formed between the two first driven side transmission surfaces 74, and one second driven side transmission surface 75 is formed on the other second driven side transmission surface 75. It is formed on the opposite side to 180 °. The two second driven side transmission surfaces 75 are each parallel to the axial direction and are parallel to each other. The interval between the two second driven side transmission surfaces 75 is formed to be equal to the interval between the pair of drive side transmission surfaces 44 a provided in the driven shaft insertion hole 44 of the drive side rotating body 32. The first driven side transmission surface 74 and the second driven side transmission surface 75 are formed in the axial direction from one end to the other end of the driven side connecting portion 72 in the axial direction.

  As shown in FIG. 2, the driven side rotating body 35 as described above is inserted into the clutch housing 31 and the support member 33 from the side opposite to the driving side rotating body 32. The driven side connecting portion 72 is inserted into the driven shaft insertion hole 44 of the driving side connecting portion 43, and the driven side control portion 71 is disposed between the two rolling elements 34. Further, the driven side rotator 35 is arranged coaxially with the clutch housing 31, the drive side rotator 32 and the support member 33. The driven side connecting portion 72 has a distal end surface (that is, an end surface in the axial direction opposite to the worm shaft 24 of the driven side rotating body 35) inside the driving side rotating body 32 and press-fitted into the driving shaft insertion hole 42. The rotating shaft 7 is in contact with the distal end portion of the connecting portion 7a in the axial direction.

  Further, as shown in FIG. 6B, the driven side connecting portion 72 is loosely fitted in the driven shaft insertion hole 44 so as to be integrally rotatable with the driving side rotating body 32 so as to overlap the driving side connecting portion 43 in the axial direction. In addition, an elastic member 46 and a buffer member 45 are interposed between the outer peripheral surface of the driven side coupling portion 72 and the inner peripheral surface of the driven shaft insertion hole 44 that are opposed in the radial direction. The pair of elastic members 46 come into contact with the driven side connecting portions 72 from both sides in the radial direction inside the driven shaft insertion hole 44, and the four buffer members 45 include the two first driven side transmission surfaces 74 and the two second 2 are respectively interposed between the driven side transmission surface 75 and the drive side transmission surface 44a. Then, when the drive-side rotator 32 rotates about the central axis with respect to the driven-side rotator 35, the first driven-side transmission surface 74 and the second driven-side transmission surface 75 according to the rotation direction of the drive-side rotator 32. The drive side transmission surface 44a which opposes either one of the driven side transmission surfaces from the rotation direction. At this time, the drive-side transmission surface 44a elastically deforms the buffer member 45 interposed between the first driven-side transmission surface 74 or the second driven-side transmission surface 75, and in the rotational direction of the drive-side transmission surface 44a. It abuts on the first driven side transmission surface 74 or the second driven side transmission surface 75 located on the front side. Then, the drive side transmission surface 44a comes into contact with either one of the first driven side transmission surface 74 and the second driven side transmission surface 75, so that the drive side rotation body 32, the driven side rotation body 35, and the like. Can be rotated together. That is, the driving side rotating body 32 and the driven side rotating body 35 are engaged with each other in the rotation direction, and the rotational driving force of the driving side rotating body 32 is transmitted to the driven side rotating body 35.

  Further, as shown in FIG. 6A, the driven-side control unit 71 has an inner side of the support member 33 such that the rolling elements 34 are interposed between the control surfaces 73 and the inner peripheral surface of the clutch housing 31. Has been inserted. The distance between each control surface 73 and the inner peripheral surface of the clutch housing 31 (interval in the direction orthogonal to the control surface 73) changes in the rotational direction of the driven-side rotator 35. In this embodiment, the distance between the control surface 73 and the inner peripheral surface of the clutch housing 31 is the longest at the center in the circumferential direction of each control surface 73, and both ends in the circumferential direction from the center in the circumferential direction of each control surface 73. It gradually becomes shorter as you head toward. The distance between the circumferential center of the control surface 73 and the inner circumferential surface of the clutch housing 31 is longer than the outer diameter of the rolling element 34, and the circumferential end of each control surface 73 and the clutch. The distance from the inner peripheral surface of the housing 31 is shorter than the outer diameter of the rolling element 34.

Next, the operation of the motor configured as described above will be described focusing on the operation of the clutch 3.
As shown in FIG. 1, when the motor unit 1 is stopped, that is, when the rotary shaft 7 is not rotated and when the drive side rotating body 32 is not rotated, the load side (that is, the window glass side) is changed to the output shaft 28. When a load is applied, the driven-side rotator 35 (worm shaft 24) tends to rotate due to the load. Then, as shown in FIG. 6A, each control surface 73 of the driven-side rotator 35 comes into contact with the rolling element 34 disposed between each control surface 73 and the inner peripheral surface of the clutch housing 31. The rolling element 34 is held together with the inner peripheral surface of the clutch housing 31. FIG. 6A shows the clutch 3 when the driven-side rotator 35 attempts to rotate counterclockwise. Since the clutch housing 31 is not rotatable in the circumferential direction, the clutch housing 31 and the rolling element 34 prevent further rotation of the driven side rotating body 35. As a result, since the rotation of the worm shaft 24 is prevented, the rotation of the rotating shaft 7 from the worm shaft 24 side is suppressed. The part of the control surface 73 that comes into contact with the rolling element 34 is a part of the control surface 73 on the end side in the circumferential direction with respect to the center of the control surface 73 in the circumferential direction. FIG. 6A shows an example of the case where the driven-side rotator 35 attempts to rotate counterclockwise. However, FIG. 6A illustrates the case where the driven-side rotator 35 attempts to rotate clockwise. However, the rotation is similarly prevented.

  On the other hand, when the motor unit 1 is driven, that is, when the rotary shaft 7 is driven to rotate, as shown in FIG. 7A and FIG. It is driven to rotate about the central axis L1 (see FIG. 2). 7 (a), 7 (b), 8 (a) and 8 (b), the clutch 3 when the rotating shaft 7 and the driving side rotating body 32 are driven to rotate counterclockwise is shown. It is shown. Then, the drive-side rotator 32 is rotated with respect to the support member 33 that is stopped, and each rolling element release portion 49 of the drive-side rotator 32 is positioned on the front side in the rotation direction of each rolling element release portion 49. The roller support 64 is pressed against the roller support 64 in the rotating direction. Then, the rolling element 34 held by the roller support 64 is pushed out between the inner peripheral surface of the clutch housing 31 and the control surface 73, and the nipping between the inner peripheral surface of the clutch housing 31 and the control surface 73 is released. The Thereby, the lock | rock of the driven side rotary body 35 is cancelled | released. At this time, as shown in FIG. 7B, the drive-side transmission surface 44a of the drive-side rotator 32 is not in contact with the first driven-side transmission surface 74 of the driven-side rotator 35. The side rotating body 35 is maintained in a stopped state.

  Then, as shown in FIG. 8B, when the driving side rotating body 32 is further driven to rotate by the rotating shaft 7, the buffer member 45 interposed between the first driven side transmission surface 74 is pressed. While being elastically deformed, the drive side transmission surface 44a contacts the first driven side transmission surface 74 from the rotational direction. As a result, the rotational driving force can be transmitted from the driving side rotating body 32 to the driven side rotating body 35 via the driving side transmitting surface 44a and the first driven side transmitting surface 74. The body 35 is rotated about the center axis (same as the center axis L2 of the worm shaft 24) as the center of rotation. At this time, as shown in FIG. 8 (a), the support member 33 rotates integrally with the drive side rotating body 32 by being pressed by the rolling element releasing portion 49, so that the rolling element 34 also becomes the support member 33. It rotates with the driven side rotating body 35 while being guided. Specifically, the rolling elements 34 are respectively disposed in the center portion of the control surface 73 in the circumferential direction, and are not sandwiched between the inner peripheral surface of the clutch housing 31 and the control surface 73 but are held by the support member 33 while being driven. The rotating body 35 rotates together with the rotation axis about the center axis of the driven side rotating body 35.

  When the worm shaft 24 is rotated along with the rotation of the driven-side rotator 35, the rotation is decelerated by the worm portion 24a and the worm wheel 27 and output from the output shaft 28. Accordingly, the window regulator that is drivingly connected to the output shaft 28 is operated, and the window glass is opened and closed (raised and lowered). 7A, 7 </ b> B, 8 </ b> A, and 8 </ b> B illustrate the clutch 3 when the drive side rotating body 32 is rotated counterclockwise. Similarly, the rotational driving force is transmitted from the driving side rotating body 32 to the driven side rotating body 35 when rotated clockwise. However, in FIGS. 7 (a), 7 (b), 8 (a), and 8 (b), when the driving side rotating body 32 is rotated clockwise, the driving side transmission surface 44a is 2 Abuts on the driven side transmission surface 75.

As described above, according to the first embodiment, the following operational effects are obtained.
(1) In the driven-side rotator 35, the driven-side connecting portion 72 connected to the drive-side rotator 32 so as to be integrally rotatable, and the inner peripheral surface of the clutch housing 31 when the drive-side rotator 32 is not rotated. And a control surface 73 that sandwiches 34 is formed separately in the axial direction. Accordingly, in the driven-side rotator 35, the driven-side connecting portion 72 and the control surface 73 are not adjacent to each other in the circumferential direction, so that the driven-side rotator 35 can be prevented from projecting in the radial direction. Therefore, since the driven-side rotator 35 is downsized in the radial direction, the clutch 3 can be downsized in the radial direction.

  (2) Since the driven side connecting portion 72 and the control surface 73 are formed continuously in the axial direction, the driven side rotating body 35 is suppressed from being elongated in the axial direction. Accordingly, an increase in the size of the clutch 3 in the axial direction is suppressed.

  (3) When the drive-side rotator 32 is rotationally driven, the drive-side transmission surface 44a comes into contact with the first driven-side transmission surface 74 or the second driven-side transmission surface 75 from the rotation direction, thereby rotating the drive-side rotator 32. The force can be efficiently transmitted to the driven side rotating body 35.

  (4) Since the shock when the driving side transmission surface 44a abuts on the first driven side transmission surface 74 or the second driven side transmission surface 75 is absorbed by the buffer member 45, the driving side transmission surface 44a and the first driven side Generation of abnormal noise when the transmission surface 74 and the second driven side transmission surface 75 come into contact with each other is suppressed.

  (5) The driven-side connecting portion 72 is configured such that the driving-side rotating body 32 is in a state where the elastic member 46 having elasticity is interposed between the driving-side rotating body 32 and the portions that overlap each other in the radial direction. 32 is loosely fitted so as to be integrally rotatable. Therefore, even when a deviation occurs between the central axis of the driving side rotator 32 and the central axis of the driven side rotator 35, the deviation is corrected (absorbed) by elastic deformation of the elastic member 46.

  (6) Since the two rolling elements 34 are held by the support member 33, the positions and postures thereof are easily stabilized. Further, the support member 33 is brought into contact with the flange portion 47 of the drive-side rotator 32, whereby further movement to the drive side (that is, the motor portion 1 side) is restricted by the flange portion 47. Further, since the flange portion 47 is formed integrally with the driving side rotating body 32, it is not necessary to separately prepare a part for restricting the movement of the support member 33 to the driving side. Therefore, the number of parts can be reduced.

  (7) The presence or absence of the rolling element 34 can be confirmed from the outside of the clutch 3 through the visual recognition hole 48. Then, by checking the presence or absence of the rolling element 34 through the visual recognition hole 48 when the clutch 3 is assembled, it is possible to prevent erroneous assembly of the rolling element 34 and the like.

  (8) By engaging the drive side engaging part 51 and the support side engaging part 68, the drive side rotating body 32 and the support member 33 can be integrated. When the clutch 3 is assembled, the drive side rotating body 32 and the support member 33 can be assembled together, so that the assembly work of the clutch 3 is facilitated.

  (9) At the start of the rotational drive of the drive side rotator 32, the rolling element 34 is pressed in the circumferential direction of the clutch housing 31 by the rolling element release portion 49 (via the roller support 64). The holding of the rolling element 34 by the inner peripheral surface and the control surface 73 is easily released. Moreover, since the drive side engaging part 51 of the drive side rotating body 32 is formed integrally with the rolling element releasing part 49, the number of parts can be reduced.

  (10) The driven side connecting portion 72 inserted into the driven shaft insertion hole 44 formed in the driving side rotating body 32 is also connected to the rotating shaft 7 inserted into the driving shaft insertion hole 42 formed in the driving side rotating body 32. Are in contact with the connecting portion 7a in the axial direction. Therefore, shakiness in the axial direction between the rotating shaft 7 and the driven-side rotating body 35 is suppressed.

  (11) The flat surface 42 a of the drive shaft insertion hole 42 and the drive side transmission surface 44 a of the driven shaft insertion hole 44 are shifted by 90 ° with respect to the central axis of the drive side rotating body 32. Therefore, the inclination with respect to the axial direction of the rotating shaft 7 inserted in the drive shaft insertion hole 42 and the driven side rotating body 35 having the driven side connecting portion 72 inserted in the driven shaft insertion hole 44 can be suppressed.

  (12) The clutch 3 of the present embodiment including the driven-side rotator 35 that is suppressed from projecting in the radial direction is downsized in the radial direction. And the motor of this embodiment can be reduced in size by providing the clutch 3 reduced in size in the radial direction. Further, by dividing the driven side connecting portion 72 and the control surface 73 in the axial direction, when the clutch 3 is assembled to the motor, the axial end of the worm shaft 24 on the driven side rotating body 35 side is pivoted. The control surface 73 can be brought closer to the supporting bearing 25. Therefore, even if the worm shaft 24 is tilted, the tilt of the control surface 73 (the axial displacement of the portion where the control surface 73 is formed in the driven-side rotator 35) is suppressed. The rolling element 34 can be reliably clamped with the peripheral surface. In this way, since the inclination of the worm shaft 24 is suppressed from affecting the operation of the clutch 3, the operation of the clutch 3 is easily stabilized.

  (13) The control surface 73 and the driven side connecting portion 72 are formed so as to be inside the outer diameter of the worm shaft 24. Therefore, the driven-side rotator 35 can be reliably reduced in size in the radial direction.

  (14) Since the shock absorbing members 50 are provided on both sides in the circumferential direction of the rolling element releasing portion 49, the rolling element releasing portion 49 becomes the roller support 64 of the support member 33 when the driving side rotating body 32 starts to rotate. Occurrence of abnormal noise at the time of contact is suppressed by the impact absorbing member 50.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 9, the clutch 90 of the second embodiment provided in the motor instead of the clutch 3 of the first embodiment replaces the driving side rotating body 32 of the first embodiment with a driving side rotation. A body 91 is provided. The driving side rotating body 91 is a second buffer that absorbs an impact when the connecting portion 7a of the rotating shaft 7 and the driven side connecting portion 72 abut on the driving side rotating body 32 of the first embodiment in the axial direction. A member 92 is provided.

  As shown in FIG. 10 (a), a pair of axial end face 41a (the lower end face in FIG. 10 (a)) on the drive side connecting portion 43 side of the drive shaft connecting portion 41 constituting the drive side rotating body 91 is paired. The buffer recess 41b is formed. As shown in FIGS. 10A and 11, the pair of buffer recesses 41 b are formed around the opening 42 d on the driven shaft insertion hole 44 side in the drive shaft insertion hole 42 in the drive shaft coupling portion 41. . The pair of buffer recesses 41 b are respectively formed at positions on both sides of the drive shaft insertion hole 42 in the short direction with respect to the opening 42 d of the drive shaft insertion hole 42. Each buffer recess 41b is recessed in the axial direction and opens to the driven shaft insertion hole 44 side. Each buffer recess 41b has an arc shape along the connection surface 44b on both sides of the opening 42d of the drive shaft insertion hole 42.

  A second buffer member 92 is provided in each of the pair of buffer recesses 41b. Each second buffer member 92 is formed from a material having elasticity such as a rubber material, and in the present embodiment, is formed from the same material as the buffer member 45 and the elastic member 46. In FIG. 9 to FIG. 11, fine dots are attached to portions showing the buffer member 45, the elastic member 46, and the second buffer member 92 made of an elastic material.

  The two second buffer members 92 are provided around the opening 42d of the drive shaft insertion hole 42 by being respectively provided in the pair of buffer recesses 41b. The two second buffer members 92 are formed at positions on both sides in the longitudinal direction of the driven shaft insertion hole 44 with respect to the opening 42 d of the drive shaft insertion hole 42. In addition, the two second buffer members 92 have an arc shape such that the shape seen from the axial direction is along the connecting surface 44 b and surrounds the opening 42 d of the drive shaft insertion hole 42. The two second buffer members 92 are connected to the distal end surface of the driven side coupling portion 72 inserted into the driven shaft insertion hole 44 (that is, the axial end surface of the driven side rotating body 35 opposite to the worm shaft 24). Each is opposed in the axial direction.

  Each of the second buffer members 92 protrudes in the axial direction from the opening of the buffer recess 41 b and protrudes toward the driven shaft insertion hole 44 from the end surface 41 a of the drive shaft connecting portion 41. The two second buffer members 92 are in contact with the distal end surfaces of the driven side connecting portions 72 inserted into the driven shaft insertion holes 44. The amount of axial protrusion from the end surface 41a of the drive shaft coupling portion 41 in each second buffer member 92 is the maximum so that the worm shaft 24 is separated from the rotary shaft 7 by the force received from the worm wheel 27 (see FIG. 1). It is formed to be equal to or slightly larger than the width W (the width in the axial direction) of the gap S between the driven-side rotator 35 and the rotating shaft 7 when it is limitedly moved.

  Here, the gap S will be described. As shown in FIGS. 9 and 10, the clutch 90 includes a connecting portion 7 a of the rotating shaft 7 press-fitted in the driving shaft insertion hole 42 inside the driving-side rotating body 91 and the distal end surface of the driven-side connecting portion 72. Is formed so as to abut against the tip of the shaft in the axial direction. On the other hand, the motor is driven in order to smoothly transmit the rotational driving force from the worm portion 24a to the worm wheel 27 while suppressing deformation of the worm shaft 24 provided with the worm portion 24a with which the worm wheel 27 meshes. The side connecting portion 72 is configured to allow a slight axial movement of the worm shaft 24 formed integrally. Therefore, the motor including the clutch 90 is arranged so that the worm shaft 24 is separated from the rotation shaft 7 when a force for moving the worm shaft 24 in the direction opposite to the rotation shaft 7 is applied from the worm wheel 27 to the worm portion 24a. It moves slightly along the direction, and a slight gap S is generated between the driven side connecting portion 72 and the connecting portion 7a.

  As shown in FIG. 10A and FIG. 11, each second buffer member 92 is integrally formed with and connected to the second buffer member 92 and the buffer member 45 and the elastic member 46 that are axially adjacent to each other. Yes. Specifically, each second buffer member 92 is connected to an axial end portion on the drive shaft connecting portion 41 side of the buffer member 45 and the elastic member 46 adjacent to each second buffer member 92 in the axial direction. Each second buffer member 92 is formed integrally with a portion made of a resin material other than the buffer member 45, the elastic member 46, and the impact absorbing member 50 in the driving side rotating body 91. The second buffer member 92 is formed at the same time when the buffer member 45, the elastic member 46, and the shock absorbing member 50 are formed.

  Next, the operation of the clutch 90 of the second embodiment will be described. The clutch 90 prevents rotation of the driven-side rotator 35 when the rotating shaft 7 is not driven, and transmits rotational driving force to the driven-side rotator 35 when driving the rotating shaft 7 according to the first embodiment. The same as the clutch 3 is performed.

  As shown in FIG. 9, in the motor of the present embodiment, when the motor unit 1 is stopped, that is, when the rotating shaft 7 is non-rotating and the driving side rotating body 91 is not rotating, the worm shaft 24 is The wheel 27 is pushed away from the rotary shaft 7. Accordingly, as shown in FIG. 10A, a gap S is formed between the distal end surface of the driven side connecting portion 72 and the distal end portion of the connecting portion 7a, and the driven side rotating body 35 and the worm shaft 24 are The second buffer member 92 that is in contact with the distal end surface of the driven side connecting portion 72 is pressed in a direction away from the rotary shaft 7.

  When the motor unit 1 is activated to rotate the worm wheel 27 in a direction opposite to the direction in which the worm wheel 27 tries to rotate due to a load applied to the output shaft 28 when the motor unit 1 is stopped, At the start of the rotation drive, the driven-side rotator 35 and the worm shaft 24 move toward the rotation shaft 7 due to the drag that the worm portion 24 a receives from the worm wheel 27. At this time, the driven-side rotating body 35 and the worm shaft 24 move gently toward the rotating shaft 7 while deforming the second buffer member 92 between the driven-side connecting portion 72 and the drive shaft connecting portion 41. Accordingly, since the shock when the connecting portion 7a of the rotating shaft 7 and the driven side connecting portion 72 come into contact with each other is absorbed by the second buffer member 92, the connecting portion 7a and the driven side connecting portion 72 come into gentle contact. .

As described above, according to the second embodiment, the following functions and effects are provided in addition to the functions and effects (1) to (14) of the first embodiment.
(15) Since the shock when the connecting portion 7a of the rotating shaft 7 and the driven side connecting portion 72 contact each other is absorbed by the second buffer member 92, the connecting portion 7a of the rotating shaft 7 and the driven side connecting portion 72 Occurrence of abnormal noise at the time of contact is suppressed.

  (16) The second buffer member 92 is formed around the opening 42 d of the drive shaft insertion hole 42 in the drive-side rotator 91. Therefore, it is possible to suppress the generation of noise when the rotating shaft 7 and the driven side connecting portion 72 are in contact with each other while allowing the rotating shaft 7 and the driven side connecting portion 72 to be in contact with each other.

  (17) The second buffer member 92 is integrally formed and connected to the buffer member 45 and the elastic member 46 that are adjacent to the second buffer member 92 in the axial direction. Therefore, when the buffer member 45 and the elastic member 46 are formed, the second buffer member 92 can be formed at the same time.

Each embodiment of the present invention may be modified as follows.
In each of the above-described embodiments, the clutches 3 and 90 are disposed between the rotary shaft 7 and the worm shaft 24 that are provided on the motor and disposed coaxially. However, the clutches 3, 90 are disposed between the drive shaft and the driven shaft that are arranged on the same axis, and transmit the rotational driving force of the driving shaft to the driven shaft, while the rotational force from the driven shaft to the driving shaft is reduced. It may be provided in a device other than the motor as long as it operates to prevent transmission.

  In the second embodiment, the protruding amount in the axial direction from the axial end surface 41a of the drive shaft coupling portion 41 in each second buffer member 92 is formed to be equal to or slightly larger than the width W of the gap S. However, it may be smaller than the gap S.

  -The formation position and shape of the 2nd buffer member 92 are not restricted to the formation position and shape of the said 2nd Embodiment. The second buffer member 92 only needs to be formed in a position and a shape in which the distal end surface of the driven side connecting portion 72 can abut on the driving side rotating body 91 from the axial direction. For example, only one second buffer member 92 is formed on the drive side rotating body 91, and is formed around the opening 42d of the drive shaft insertion hole 42 so as to form an annular shape surrounding the opening 42d. Also good. Further, a plurality of second buffer members 92 may be formed intermittently along the circumferential direction around the drive shaft insertion hole 42 in the drive side rotator 91.

  In the second embodiment, the second buffer member 92 is provided only on the drive side rotating body 91. However, the second buffer member 92 may be provided on the distal end surface of the driven side coupling portion 72 so as to be able to contact the end surface 41 a in the axial direction of the drive shaft coupling portion 41. Further, the second buffer member 92 may be provided on both the driving side rotating body 91 and the distal end surface of the driven side connecting portion 72.

  In the second embodiment, the second buffer member 92 is integrally formed and connected to the second buffer member 92 and the buffer member 45 and the elastic member 46 that are adjacent to each other in the axial direction. 45 and the elastic member 46 may not be formed integrally.

  In the second embodiment, when the motor unit 1 is stopped, the worm shaft 24 is pushed away from the rotating shaft 7 by the worm wheel 27. However, the motor may be configured such that the worm shaft 24 is pushed toward the rotating shaft 7 by the worm wheel 27 when the motor unit 1 is stopped. In this way, when the motor unit 1 is stopped, the driven-side rotating body 35 and the worm shaft 24 are second between the driven-side connecting portion 72 and the drive shaft connecting portion 41 as shown in FIG. The buffer member 92 is moved toward the rotary shaft 7 while being deformed. Therefore, when the motor unit 1 is stopped, the connecting part 7a and the driven side connecting part 72 come into contact with each other. When the motor unit 1 is driven, the driven-side rotating body 35 and the worm shaft 24 are moved away from the rotating shaft 7 by the force received from the worm wheel 27 according to the rotating direction of the rotating shaft 7. Thereafter, when the motor unit 1 is stopped, the driven rotator 35 and the worm shaft 24 are moved toward the rotating shaft 7 by being pushed by the worm wheel 27. At this time, the driven-side rotating body 35 and the worm shaft 24 move gently toward the rotating shaft 7 while deforming the second buffer member 92 between the driven-side connecting portion 72 and the drive shaft connecting portion 41. Accordingly, since the shock when the connecting portion 7a of the rotating shaft 7 and the driven side connecting portion 72 come into contact with each other is absorbed by the second buffer member 92, the connecting portion 7a and the driven side connecting portion 72 come into gentle contact. . Therefore, the same effect as (15) of the two embodiments can be obtained.

  In each of the above embodiments, the drive shaft insertion hole 42 and the driven shaft insertion hole 44 are configured such that the flat surface 42a of the drive shaft insertion hole 42 and the drive side transmission surface 44a of the driven shaft insertion hole 44 are the drive side rotating body 32 (or drive). It is formed so as to be shifted by 90 ° about the central axis of the side rotating body 91). However, in the drive shaft insertion hole 42 and the driven shaft insertion hole 44, the plane 42a of the drive shaft insertion hole 42 and the drive side transmission surface 44a of the driven shaft insertion hole 44 are the drive side rotating body 32 (or the drive side rotating body 91). It may be formed so as to deviate at an angle other than 90 ° around the central axis of the. The drive shaft insertion hole 42 and the driven shaft insertion hole 44 may be formed so that the flat surface 42a of the drive shaft insertion hole 42 and the drive side transmission surface 44a of the driven shaft insertion hole 44 are parallel to each other.

  The shape of the drive shaft insertion hole 42 is not limited to the shape of each of the above embodiments. The drive shaft insertion hole 42 only needs to have a shape that allows the rotation shaft 7 and the drive-side rotator 32 (or the drive-side rotator 91) to be coupled so as to be integrally rotatable. Further, the driven shaft insertion hole 44 is not limited to the shape of each of the above embodiments. The driven shaft insertion hole 44 only needs to have a shape that allows the driven side rotating body 35 (or the driving side rotating body 91) to be connected to the driven side rotating body 35 so as to be integrally rotatable.

  In the drive side rotator 32, the drive shaft insertion hole 42 and the driven shaft insertion hole 44 are not necessarily formed continuously in the axial direction. Further, the driven side connecting portion 72 inserted into the driven shaft insertion hole 44 may not necessarily contact the connecting portion 7a of the rotating shaft 7 inserted into the drive shaft insertion hole 42 in the axial direction.

  In the first embodiment, the driving side engaging portion 51 is integrally formed with the rolling element releasing portion 49. However, the driving side engaging portion 51 may be integrally formed in a portion different from the rolling element releasing portion 49 in the driving side rotating body 32. Further, the drive-side rotator 32 and the support member 33 are engaged with each other in the axial direction, and the drive-side rotator 32 and the support member 33 are allowed to rotate relative to each other around the central axis of the drive-side rotator 32. The joint portion may be provided as a component different from the drive side rotating body 32 and the support member 33. Further, the clutch 3 does not necessarily have to include the engaging portions (the driving side engaging portion 51 and the support side engaging portion 68). The same applies to the clutch 90 of the second embodiment.

-The clutches 3 and 90 do not necessarily need to be provided with the support member 33.
In each of the above-described embodiments, the visual recognition hole 48 is formed in the flange portion 47 of the drive side rotator 32, 91. However, the collar portion 47 may be configured not to include the visual recognition hole 48.

  In each of the above embodiments, the ring-shaped flange portion 47 is provided on the drive-side rotating bodies 32 and 91 as the contact portion with which the support member 33 contacts in the axial direction. However, the abutting portion is not necessarily an annular shape as long as it can regulate the movement of the support member 33 that abuts the corresponding contacting portion in the axial direction to the further drive side (motor unit 1 side). May be. For example, instead of the flange portion 47, rod-like contact portions extending radially outward may be provided on the driving side rotating bodies 32 and 91. Further, the drive side rotators 32 and 91 may be configured not to include the flange portion 47.

  In each of the above-described embodiments, the driven side connecting portion 72 has the elastic member 46 interposed between the portions that overlap each other in the radial direction and the driving side of the driving side rotating bodies 32 and 91. The connecting portion 43 is loosely fitted so as to be integrally rotatable. However, the elastic member 46 may be omitted from the driving side rotating bodies 32 and 91 and the driven side connecting portion 72 may be inserted.

  In the first embodiment, by inserting the driven side connecting portion 72 of the driven side rotating body 35 into the driven shaft insertion hole 44 of the driving side rotating body 32, the driving side rotating body 32, the driven side rotating body 35, and Are connected so that they can rotate together. However, the structure which connects the drive side rotary body 32 and the driven side rotary body 35 so that integral rotation is possible is not restricted to this. For example, by providing an insertion recess in the driven side connecting portion 72 and inserting a columnar drive side connecting portion 43 in the insertion recess, the driving side rotating body 32 and the driven side rotating body 35 are connected so as to be integrally rotatable. Also good. At this time, with the elastic member 46 interposed between the driven side connecting portion 72 and the driving side connecting portion 43 that overlap in the radial direction, the columnar driving side connecting portion 43 is inserted into the insertion recess of the driven side connecting portion 72. You may loose-fit. If it does in this way, the effect similar to (5) of the said 1st Embodiment can be acquired.

-The drive side rotary bodies 32 and 91 do not necessarily need to be provided with the buffer member 45.
In each of the above-described embodiments, when the drive side rotating bodies 32 and 91 are rotationally driven, the drive side transmission surface 44 a moves from the rotation direction to the first driven side transmission surface 74 or the second driven side transmission surface 75 of the driven side coupling portion 72. Abut. However, in the driving side rotating bodies 32 and 91 and the driven side connecting portion 72, the portions that are in contact with each other when the driving side rotating bodies 32 and 91 are rotationally driven are not necessarily flat.

  In each of the above embodiments, in the driven side rotating body 35, the driven side connecting portion 72 and the control surface 73 are formed continuously in the axial direction. However, if the driven side connecting portion 72 and the control surface 73 are formed separately in the axial direction, they may be formed apart from each other in the axial direction.

  In each of the above embodiments, the clutches 3 and 90 are configured to include two rolling elements 34. However, the clutches 3 and 90 may be configured to include at least one rolling element 34. In this case, according to the number of rolling elements 34, the number of control surfaces 73, the number of roller supports 64 of the support member 33, the number of rolling element release portions 49, and the number of viewing holes 48 are changed.

-In each above-mentioned embodiment, although rolling element 34 has constituted the column shape, it does not necessarily need to be a column shape. For example, the rolling element 34 may be spherical.
In each of the above embodiments, the driving side rotating bodies 32 and 91 are formed separately from the rotating shaft 7, but may be formed integrally. In each of the above embodiments, the driven-side rotator 35 is formed integrally with the worm shaft 24. However, the driven-side rotator 35 may be formed separately from the worm shaft 24 so as to be integrally rotatable.

The technical idea that can be grasped from the above embodiment and each of the above modifications will be described below.
(A) In the clutch, the control surface and the driven side connecting portion are formed inside an outer diameter of a driven shaft that rotates integrally with the driven side rotating body. According to this configuration, the driven-side rotator can be reliably reduced in size in the radial direction.

Other technical ideas will be described below.
(Appendix 1) An annular clutch housing, a drive-side rotator that is driven to rotate, and a control surface that faces radially outwardly inside the clutch housing, and the drive-side rotator is rotated when the drive-side rotator rotates. A driven-side rotating body to which a rotational driving force is transmitted, and disposed between an inner peripheral surface of the clutch housing and the control surface, and rotates with the driven-side rotating body when the driving-side rotating body is driven to rotate; And a rolling element that is sandwiched between an inner peripheral surface of the clutch housing and the control surface to prevent rotation of the driven-side rotating body when the driving-side rotating body is not rotated. The rotating body includes a driven side connecting portion connected to the driving side rotating body so as to be integrally rotatable, and the control surface and the driven side connecting portion are separated in the axial direction.

  According to this configuration, in the driven-side rotator, the driven-side connecting portion and the control surface are not adjacent to each other in the circumferential direction, so that the driven-side rotator can be prevented from having a shape protruding in the radial direction. As a result, the size of the clutch in the radial direction can be reduced.

(Supplementary Note 2) In the clutch described above, the driven side coupling portion and the control surface are formed continuously in the axial direction.
According to this configuration, since the driven-side rotator is suppressed from being elongated in the axial direction, an increase in the size of the clutch in the axial direction is suppressed.

  (Supplementary note 3) In the clutch described above, the driven side connecting portion is configured such that a driving side transmission surface formed on the driving side rotating body is contacted from a rotation direction of the driving side rotating body when the driving side rotating body is driven to rotate. The gist is to have a driven side transmission surface in contact.

  According to this configuration, when the driving side rotating body is driven to rotate, the driving side transmission surface abuts on the driven side transmission surface from the rotation direction, thereby efficiently transmitting the rotational driving force of the driving side rotating body to the driven side rotating body. be able to.

  (Appendix 4) In the clutch described above, at least one of the drive side transmission surface and the driven side transmission surface has a buffer member that absorbs an impact when the drive side transmission surface abuts on the driven side transmission surface. The gist is that it is provided.

  According to this configuration, since the shock when the driving side transmission surface comes into contact with the driven side transmission surface is absorbed by the buffer member, the generation of noise when the driving side transmission surface and the driven side transmission surface come into contact with each other is generated. It is suppressed.

  (Supplementary Note 5) In the clutch described above, the driving-side rotator and the driven-side rotator are arranged coaxially, and either one of the driving-side rotator and the driven-side connecting portion overlaps each other in the radial direction. Thus, the gist is that the elastic member having elasticity is interposed between the portions overlapping each other in the radial direction, and is loosely fitted to one of the other so as to be integrally rotatable.

According to this configuration, even when a deviation occurs between the central axis of the driving-side rotator and the central axis of the driven-side rotator, the deviation is corrected (absorbed) by elastic deformation of the elastic member. .
(Appendix 6) In the clutch described above, a plurality of the rolling elements are provided and a support member that holds the plurality of rolling elements is provided. The gist is to have a contact portion.

  According to this configuration, the plurality of rolling elements are held by the support member, so that their positions and postures are easily stabilized. Further, when the support member comes into contact with the contact portion of the drive side rotating body, further movement to the drive side is restricted by the contact portion. Furthermore, since the contact portion is formed on the driving side rotating body, it is not necessary to separately prepare a part for restricting the movement of the support member to the driving side. Therefore, the number of parts can be reduced.

  (Supplementary note 7) In the clutch described above, the drive-side rotator includes a flange portion extending in a radial direction so as to cover an end portion in the axial direction of the support member on the drive-side rotator side, and The gist of the present invention is that a visual recognition hole is formed in the collar portion so that the rolling element can be visually recognized from the side opposite to the support member.

According to this configuration, the presence or absence of rolling elements can be confirmed through the visual recognition hole. Therefore, it is possible to prevent erroneous assembly of rolling elements and the like.
(Appendix 8) In the clutch described above, a plurality of the rolling elements and a support member that holds the plurality of rolling elements are provided, and the driving side rotating body and the support member include the driving side rotating body and the The gist of the present invention is that an engaging portion is formed that allows the drive-side rotator and the support member to rotate relative to each other around the central axis of the drive-side rotator while engaging the support member in the axial direction. It is said.

  According to this configuration, the driving side rotating body and the support member can be integrated by engaging with the engaging portion. When the clutch is assembled, the drive side rotating body and the support member can be assembled together, so that the clutch can be assembled easily.

  (Supplementary note 9) In the clutch according to the above, the driving-side rotator presses the rolling element at the start of rotation driving of the driving-side rotator, and the inner surface of the clutch housing and the control surface The gist of the invention is that it includes a rolling element releasing portion that releases the rolling element, and the engagement portion on the drive side rotating body is formed integrally with the rolling element releasing portion.

  According to this configuration, at the start of the rotational drive of the drive-side rotator, the rolling element is pressed by the rolling element release portion, so that the rolling element can be easily held between the inner peripheral surface and the control surface of the clutch housing. Is done. Moreover, since the engaging part of the drive side rotating body is formed in the rolling element releasing part, the number of parts can be reduced.

  (Supplementary note 10) In the clutch described above, the drive-side rotator is continuously formed in the axial direction with a drive shaft insertion hole into which a rotationally driven drive shaft is inserted so as to be integrally rotatable. A driven shaft insertion hole into which the driven side coupling portion is inserted so as to be integrally rotatable, and the driven side coupling portion inserted into the driven shaft insertion hole is inserted into the drive shaft insertion hole. The gist of this is that they are in contact with each other in the axial direction.

According to this configuration, shakiness in the axial direction between the drive shaft and the driven-side rotator is suppressed. In the present invention, “insertion” includes loose fitting and press-fitting.
(Supplementary Note 11) In the clutch described above, the drive shaft insertion hole and the driven shaft insertion hole are formed in a cylindrical shape including a pair of planes that are spaced apart from each other in the radial direction and parallel to each other, and a connection surface that connects the planes. The gist of the invention is that an inner peripheral surface is provided, and the plane of the drive shaft insertion hole and the plane of the driven shaft insertion hole are formed so as to be shifted by 90 ° about the center axis of the drive side rotating body. It is said.

According to this configuration, it is possible to suppress the inclination of the drive shaft inserted into the drive shaft insertion hole and the driven-side rotating body having the driven-side coupling portion inserted into the driven shaft insertion hole with respect to the axial direction.
(Supplementary Note 12) In the clutch described above, a second buffer that absorbs an impact when the drive shaft and the driven side connecting portion abut at least one of the drive side rotary body and the driven side rotary body. The gist is that the member is provided.

According to this configuration, since the impact when the drive shaft and the driven side connecting portion come into contact with each other is absorbed by the second buffer member, the generation of noise when the drive shaft and the driven side connecting portion come into contact with each other is generated. It is suppressed.
(Additional remark 13) The above-mentioned clutch WHEREIN: The said 2nd buffer member makes it the summary that it is provided around the said drive shaft insertion hole in the said drive side rotary body.

According to this configuration, it is possible to suppress the generation of noise when the drive shaft and the driven side connecting portion come into contact while enabling the drive shaft and the driven side connecting portion to contact each other.
(Supplementary Note 14) Rotation drive having a motor unit having a drive shaft that is driven to rotate and a driven shaft that is arranged coaxially with the drive shaft and to which the rotational drive force of the drive shaft is transmitted and transmitted to the driven shaft A speed reduction unit that decelerates and outputs a force, and the above-described clutch provided between the drive shaft and the driven shaft, and the drive-side rotator is provided to rotate integrally with the drive shaft. The gist of the invention is that the driven-side rotating body is a motor provided to be rotatable integrally with the driven shaft.

  According to this configuration, the clutch including the driven-side rotator that is prevented from having a shape protruding in the radial direction can be downsized in the radial direction. And the motor of this invention can be reduced in size by providing the clutch reduced in size in radial direction. In addition, by dividing the driven side connecting portion and the control surface in the axial direction, when the clutch is assembled to the motor, the axial end of the driven side of the driven side of the driven shaft is supported with respect to the bearing that supports the shaft. The control surface can be brought closer. Therefore, even if the driven shaft is tilted, the tilt of the control surface is suppressed, so that the tilt of the driven shaft is suppressed from affecting the operation of the clutch. As a result, the operation of the clutch tends to be stable.

(Additional remark 15) The above-mentioned motor WHEREIN: The said transmission surface and the said driven side connection part make it the summary to be provided inside the outer diameter of the said driven shaft.
According to this configuration, the driven-side rotator can be reliably reduced in size in the radial direction.

  DESCRIPTION OF SYMBOLS 1 ... Motor part, 2 ... Deceleration part, 3,90 ... Clutch, 7 ... Rotary shaft as a drive shaft, 24 ... Worm shaft as a driven shaft, 31 ... Clutch housing, 32, 91 ... Drive side rotary body, 33 ... Support member, 34 ... rolling element, 35 ... driven side rotating body, 42 ... drive shaft insertion hole, 42a ... flat surface, 42b ... coupling surface, 44 ... driven shaft insertion hole, 44a ... drive side transmission surface as a plane, 44b ... Connection surface, 45 ... buffer member, 46 ... elastic member, 47 ... collar as a contact portion, 48 ... visual recognition hole, 49 ... rolling element release portion, 51 ... drive side engagement portion as engagement portion, 68 ... Support side engaging portion as an engaging portion, 72 ... driven side connecting portion, 73 ... control surface, 74 ... first driven side transmitting surface as driven side transmitting surface, 75 ... second driven side as driven side transmitting surface Transmission surface, 92 ... second buffer member.

Claims (3)

An annular clutch housing;
A drive-side rotating body that is rotationally driven;
A driven-side rotator that has a control surface facing radially outward inside the clutch housing and to which the rotational driving force of the drive-side rotator is transmitted during rotation of the drive-side rotator;
The clutch housing is disposed between an inner peripheral surface of the clutch housing and the control surface, and rotates with the driven side rotating body when the driving side rotating body is driven to rotate. A rolling element that is sandwiched between an inner peripheral surface and the control surface and prevents rotation of the driven side rotating body;
A clutch with
The driven-side rotating body includes a driven-side connecting portion that is connected to the driving-side rotating body so as to be integrally rotatable, and a first driven-side transmission surface and a second driven-side transmission surface are rotated in the driven-side connecting portion. The clutch is formed according to a direction, and the first driven side transmission surface, the second driven side transmission surface, and the control surface are formed continuously in the axial direction. The clutch according to claim 1, wherein
The driven side coupling portion has a substantially elliptical cross-sectional shape orthogonal to the axial direction. In the clutch according to claim 1 or 2,
The drive-side rotating body includes a driven shaft insertion hole that is in an insertion state in which the driven-side coupling portion can rotate integrally,
The clutch, wherein the driven side connecting portion is formed narrower than the driven shaft insertion hole.