JP4824707B2 - Brake device and motor with reduction mechanism - Google Patents

Description

  The present invention relates to a brake device used in a motor with a reduction mechanism for a power window that opens and closes a window glass of an automobile, for example, and a motor with the reduction mechanism.

Conventionally, this type of brake device is connected to a drive-side rotating body connected to a drive shaft so as to be integrally rotatable with a drive shaft, and to a driven shaft coaxially arranged with the drive shaft, for example, as shown in Patent Document 1. A driven-side rotator, an engagement position between the drive-side rotator and the driven-side rotator that contacts the fixed friction portion and engages in the rotational direction, and is separated from the fixed friction portion. A brake member that can move between two non-engaged positions that are non-engaged in the rotational direction is provided so as to rotate integrally with the driven-side rotator. An urging member for urging the brake member toward the fixed friction portion is interposed between the brake member and the driven side rotating body. In such a brake device, when rotation is input from the drive shaft side, the brake member is retracted to the non-engagement position against the biasing force of the biasing member by the rotational force of the drive-side rotating body, and the drive shaft rotates. Is transmitted to the driven shaft. On the other hand, at the time of rotation input from the driven shaft side, the brake member is maintained at the engaged position by the urging force of the urging member to restrict the rotation of the driven shaft.
JP 2002-130336 A

  However, in the brake device as described above, for example, when assembled to a motor with a speed reduction mechanism, each component such as a driving side rotating body, a driven side rotating body, a brake member, and an urging member is stacked one by one in order. Since it can be assembled, the assembly has been difficult.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a brake device and a motor with a speed reduction mechanism that can be easily assembled.

  In order to solve the above-mentioned problem, the invention according to claim 1 is connected to a drive side rotating body connected to a drive shaft so as to be integrally rotatable, and to a driven shaft coaxially arranged with the drive shaft so as to be integrally rotatable. And a brake member provided so as to be able to rotate integrally with the driven-side rotating body between the driven-side rotating body and the driven-side rotating body. An engagement position for receiving and abutting and engaging in the rotational direction, and a non-engagement position for disengaging the fixed friction portion against the urging force of the urging member and disengaging in the rotational direction. A brake mechanism movably provided between two positions, and when the rotation is input from the drive shaft side, the brake member is switched to the non-engagement position by the rotational force from the drive side rotating body, and the drive shaft The rotation of the driven shaft can be transmitted to the driven shaft. A brake device that restricts the rotation of the driven shaft by maintaining the brake member in the engaged position at the time of rotation input from the driving member, wherein the driving side rotating body and the driven side rotating body are respectively connected to the brake member. First locking means is provided between the drive-side rotator and the brake member, and second locking means is provided between the driven-side rotator and the brake member so as to be able to be locked without being disengaged. This is the gist.

  In the present invention, the first locking means is provided between the driving side rotating body and the brake member so that the driving side rotating body and the driven side rotating body can be locked with respect to the brake member. A second locking means is provided between the body and the brake member. As a result, the brake device can be assembled as a unit (integrated) independently from the assembly to the drive shaft and the driven shaft, so that the assembly to the drive shaft and the driven shaft can be facilitated. Further, since the brake device can be produced in a lump, it can contribute to the improvement of production efficiency.

  According to a second aspect of the present invention, in the brake device according to the first aspect, the second locking means includes a driven side locking portion formed to extend from the driven side rotating body toward the axial drive shaft side. A brake side locking portion that extends from the brake member toward the axial driven shaft side, and the driven side locking portion and the brake side locking portion are locked in the axial direction. The gist.

  In the present invention, the second locking means includes a driven side locking portion extending from the driven side rotating body to the axial drive shaft side, and a brake side engagement extending from the brake member to the axial driven shaft side. Since the driven side locking portion and the brake side locking portion are locked in the axial direction, the driven side rotating body and the brake member can be locked so as not to be detached.

  According to a third aspect of the present invention, in the brake device according to the first or second aspect, the rotation transmitting unit for transmitting the rotation of the driving side rotating body to the driven side rotating body is provided to the driving side rotating body. The driven rotor is provided with a rotation engagement portion that can be engaged with the rotation transmission portion in the rotation direction, and between the rotation transmission portion and the rotation engagement portion in the rotation direction. The gist is that a buffer member is provided.

  In the present invention, since the buffer member is provided between the rotation transmission portion and the rotation engagement portion in the rotation direction, for example, an impact generated when a rotational force is transmitted between the rotation transmission portion and the rotation engagement portion. Can be suppressed.

  The gist of the invention according to claim 4 is the brake device according to claim 3, wherein the buffer member is integrally formed with at least one of the rotation transmitting portion and the rotation engaging portion.

  In this invention, since the buffer member is integrally formed with at least one of the rotation transmission portion and the rotation engagement portion, the number of parts can be reduced compared to the case where the buffer member is provided separately, and the brake device can be easily assembled. It becomes.

  The invention according to claim 5 is a motor with a speed reduction mechanism in which a motor main body that rotationally drives a rotating shaft and a speed reducing portion having a worm shaft that is arranged coaxially with the rotating shaft are assembled together. The gist is that the brake device according to any one of claims 1 to 4 is assembled between the rotating shaft and the worm shaft.

  In this invention, since the brake device which can be unitized is assembled | attached, it can improve the assembly property of the motor with a reduction mechanism.

  Therefore, according to the above-described invention, the assembly of the brake device can be facilitated.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a motor 1 of the present embodiment. The motor 1 of this embodiment is a motor for a power window that opens and closes a window glass of an automobile, and is configured by a motor with a speed reducer that includes a motor body 2 and a speed reduction unit 3.

  The motor body 2 includes a yoke housing 4, a pair of magnets 5, an armature 6, a brush holder 7, and a pair of brushes 8. The yoke housing 4 is formed in a substantially bottomed flat cylindrical shape, and a magnet 5 is fixed to the inner surface thereof. A bearing 9 is provided at the center of the bottom of the yoke housing 4, and the bearing 9 rotatably supports the base end of the rotary shaft (drive shaft) 10 of the armature 6.

  The opening 4a of the yoke housing 4 is formed in a flange shape, and is fixed to the opening 21a of the gear housing 21 described later with screws 11. In this fixing, the brush holder 7 is sandwiched and fixed by the opening 4 a of the yoke housing 4 and the opening 21 a of the gear housing 21.

  The brush holder 7 holds, in the yoke housing 4, a brush 12 that is in sliding contact with a commutator 13 that is fixed to the bearing 12 and the rotating shaft 10 that rotatably supports the tip of the rotating shaft 10 of the armature 6. Further, the portion of the brush holder 7 that protrudes from both housings 4 and 21 is a connector portion 7a for connecting to a vehicle body side connector (not shown) extending from the vehicle body side, and a plurality of portions are provided in the recess 7b of the connector portion 7a. The terminal 14 is exposed. These terminals 14 are inserted into the brush holder 7 and are electrically connected to the brush 8, the rotation sensor 15 a provided in the motor 1, and the like. And by connecting the connector part 7a with the vehicle body side connector, the motor 1 and window ECU20 with which the vehicle body side is equipped are electrically connected, and power supply, a sensor signal, etc. are output.

For such a motor body 2, the speed reduction unit 3 includes a gear housing 21, a worm shaft 22, a worm wheel 23, an output shaft 24, and a brake device 30.
The gear housing 21 is made of resin, and a worm shaft 22, a worm wheel 23, and a brake device 30 are accommodated in the gear housing 21. The gear housing 21 includes an opening 21a that faces the opening 4a of the yoke housing 4, and the brush holder 7 is interposed between the openings 4a and 21a.

  The gear housing 21 is a substantially cylindrical shaft housing cylinder portion 21b extending in the axial direction from the opening 21a for housing the worm shaft 22, and a wheel for housing the worm wheel 23 in communication with the shaft housing cylinder portion 21b. A housing recess 21c and a brake housing recess 21d for housing the brake device 30 provided at the base end (motor body 2 side) of the shaft housing cylinder portion 21b are provided.

  A worm shaft 22 is rotatably supported coaxially with the rotary shaft 10 by a pair of bearings 25a and 25b having a predetermined interval and accommodated in the shaft accommodating cylinder portion 21b. A worm 22a for meshing with the worm wheel 23 is formed between portions of the worm shaft 22 supported by the bearings 25a and 25b. The worm 22a is constituted by a drum-type worm that has a smaller diameter at the central portion in the axial direction than both ends in the axial direction and has an outer peripheral portion having the teeth 23a of the worm wheel 23. That is, the meshing range between the worm 22a and the worm wheel 23 is increased, and the strength of this meshing portion is improved. A thrust receiving ball 26 a and a thrust receiving plate 26 b for receiving a thrust load of the worm shaft 22 are provided at the tip of the worm shaft 22.

  A worm wheel 23 engaged with the worm 22a of the worm shaft 22 is rotatably accommodated and supported in the wheel accommodating recess 21c. The worm wheel 23 is configured by integrally molding a resin gear 23y on the outer periphery of a metal reinforcing plate 23x. On the outer periphery of the resin gear portion 23y, a tooth portion 23a having a flat tooth tip meshing with the worm 22a of the worm shaft 22 is provided. The wheel receiving recess 21 c that supports the worm wheel 23 is closed at the opening by the cover member 28, and the base end face of the output shaft 24 is also supported by a part of the cover member 28. In addition, a window regulator (not shown) for opening and closing the window glass is drivingly connected to the output shaft 24.

[Configuration of brake device]
A brake device 30 interposed between the worm shaft 22 and the rotary shaft 10 is housed in the brake housing recess 21d. As shown in FIGS. 2A and 2B, the brake device 30 is connected to the rotary shaft 10 and is rotated integrally with the rotary shaft 10. The brake device 30 is connected to the worm shaft 22 and the worm shaft 22. And a driven side rotating body 32 that rotates integrally. Further, a brake member 33 provided between the driving side rotating body 31 and the driven side rotating body 32 so as to be integrally rotatable with the driven side rotating body 32, and interposed between the driven side rotating body 32 and the brake member 33. And a coil spring 34 as a biasing member.

  3 (a), 3 (b), and 3 (c) show the drive side rotator 31. FIG. In FIG. 3A, hatched portions (portions indicated by dots) indicate elastomer portions in plan view. The drive-side rotator 31 has a circular shape in plan view, and a cylindrical portion 31a formed at the center thereof is formed with a fixing hole 31b through which the tip of the rotating shaft 10 is inserted and fixed. Further, a metal plate 35 having a plurality of protrusions 35a at equal intervals in the circumferential direction is insert-molded inside the cylindrical portion 31a, and the distal end portion of the rotary shaft 10 is also inserted into and fixed to the plate 35. In addition, the fixed hole 31b and the front-end | tip part of the rotating shaft 10 are formed in flat shape.

  On the driven-side rotator 32 side of the drive-side rotator 31, three rotation transmitting portions 31c extending outward from the cylindrical portion 31a are formed at equal intervals in the circumferential direction. Each rotation transmitting portion 31c is formed so as to protrude in the axial direction, and an inner peripheral side end portion of the protruding portion is covered with an elastomer 36a as a buffer member. The end portion on the inner peripheral side of the rotation transmitting portion 31c has a shape swelled by the elastomer 36a, and the circumferential width thereof is larger than the circumferential width of the portion not covered by the elastomer 36a in the rotation transmitting portion 31c. ing. The elastomer 36a is provided on the drive side rotating body 31 by two-color molding. Also, elastomer is formed in two colors on the tip surface of the cylindrical portion 31a (the end surface on the driven side rotating body 32 side) and a part of the inner peripheral surface of the fixed hole 31b. The elastomer is formed with the elastomer 36a of the rotation transmitting portion 31c. It is formed continuously.

  A flange portion 31d extending in a bowl shape from the cylindrical portion 31a is formed at the end of the driving side rotating body 31 on the motor body 2 side. An annular elastomer 36b in contact with the cylindrical portion 31a is continuously formed on the flange portion 31d with the elastomer 36a of the rotation transmitting portion 31c. The elastomer 36b of the flange portion 31d is also formed in a plurality of through holes 31e that are formed through the flange portion 31d in the axial direction. In the portion where the through hole 31e overlaps the protrusion 35a of the plate 35, the elastomer 36b is formed only on the driven side rotating body 32 side than the protrusion 35a (see FIG. 3B).

  In the flange portion 31d, three cam grooves 31f facing the brake member 33 are formed at equal intervals in the circumferential direction at a position radially outside the rotation transmitting portion 31c. Each cam groove 31f has a shape extending in the circumferential direction, and has a radial width that decreases toward the circumferential end. Each cam groove 31f has the deepest center in the circumferential direction, and its bottom surface is curved so that it gradually becomes shallower toward the circumferential end (see FIG. 3C).

  As shown in FIGS. 2 and 4A, 4B, and 4C, the driven-side rotating body 32 has a cylindrical portion 32a at the center thereof, and the worm shaft 22 is inserted and fixed in the cylindrical portion 32a. A fixing hole 32b is formed. Three extending portions 32c extending radially from the central portion are formed at the distal end portion (end portion on the motor body 2 side) of the cylindrical portion 32a at equal intervals in the circumferential direction, and each extending portion 32c has an axial direction. A protruding rotation engagement portion 32d is formed. Each rotational engagement portion 32d is formed with contact recesses 32e on both sides in the circumferential direction at the inner circumferential end, and each rotational engagement portion 32d has a shape in which the radially inner side is slightly narrowed in the circumferential direction. There is no. A cylindrical portion 31a of the drive side rotator 31 is inserted on the inner peripheral side of the rotation engagement portion 32d, and each rotation transmission portion 31c of the drive side rotator 31 corresponds to each rotation engagement portion of the driven side rotator 32. 32d (see FIG. 2). That is, each rotation transmission part 31c of the driving side rotating body 31 and each rotation engaging part 32d of the driven side rotating body 32 are alternately arranged in the circumferential direction.

  In the driven-side rotator 32, a spring support portion 32f having a circular cup shape opening toward the drive-side rotator 31 is formed on the outer peripheral portion of the cylindrical portion 32a. The spring support portion 32f includes a bottom portion 32g extending in the direction perpendicular to the axis, and a pair of side walls 32h extending in the axial direction (on the rotating shaft 10 side) from the outer peripheral edge of the bottom portion 32g. The pair of side walls 32h are point-symmetric with respect to the center of the driven side rotating body 32, and one end portion in the circumferential direction is a protruding end portion 32i protruding to the outer peripheral side. A ring-shaped sensor magnet 15b magnetized in the circumferential direction is fixed to the worm shaft 22 side of the spring support portion 32f (see FIGS. 1 and 2). Rotation information such as the rotation direction and the number of rotations of the driven-side rotator 32 is detected by the rotation sensor 15a facing the rotation sensor 15a.

  A driven side locking portion 32j extending from the outer peripheral edge of the bottom portion 32g in the same direction as the side wall 32h is formed between the end portions of each side wall 32h. Each locking portion 32j has an engaging protrusion 32k that protrudes in the circumferential direction (the protruding end portion 32i side) of the driven-side rotator 32 at the tip thereof. The respective locking portions 32j are point-symmetric with respect to the center of the driven side rotating body 32. Each locking portion 32j protrudes to the outer peripheral side of the spring support portion 32f, and the protruding amount is equivalent to that of the protruding end portion 32i of the side wall 32h.

  As shown in FIGS. 2 and 5A, 5B, and 5C, the brake member 33 has a substantially cylindrical shape, and an engagement groove 33b extending along the axial direction is formed on the inner peripheral surface of the cylindrical portion 33a. Three are formed at equal intervals in the circumferential direction. Each engagement groove 33b is inserted into each rotation engagement portion 32d of the driven-side rotator 32, and each engagement groove 33b is engaged with each rotation engagement portion 32d in the circumferential direction. That is, the brake member 33 is attached so as to be able to rotate integrally with the driven-side rotator 32 and to move in the axial direction.

  In the brake member 33, a spring support portion 33c having a circular cup shape opened to the driven side rotating body 32 side is formed at the tip end portion (end portion on the motor body 2 side) of the cylindrical portion 33a. The spring support portion 33c includes a bottom portion 33d extending outward from the outer peripheral surface of the cylindrical portion 33a, and a pair of side walls 33e extending in the axial direction (worm shaft 22 side) from the outer peripheral edge of the bottom portion 33d. The diameter of the spring support 33c of the brake member 33 is slightly larger than the diameter of the spring support 32f of the driven-side rotator 32. The spring support 33c of the brake member 33 is a spring of the driven-side rotator 32. It is located on the outer peripheral side of the support portion 32f. Between the end portions of each side wall 33e, a brake side locking portion 33f extending from the outer peripheral edge of the bottom portion 33d in the same direction as the side wall 33e is formed. Each locking portion 33f has an engaging projection 33g protruding in the circumferential direction of the brake member 33 at its tip (see FIG. 6). The engaging portions 33f are point-symmetric with respect to the center of the brake member 33, and the engaging protrusions 33g can be engaged with the engaging protrusions 32k of the driven-side rotating body 32 in the axial direction. In the brake device 30 of the present embodiment, the driven side locking portion 32j of the driven side rotating body 32 and the brake side locking portion 33f of the brake member 33 constitute a second locking means.

  As shown in FIG. 2, a coil spring 34 as an urging member is interposed between the driven rotor 32 and the spring support portions 32f and 33c of the brake member 33 as described above. Both ends of the coil spring 34 are in contact with the bottom portions 32g and 33d of the spring support portions 32f and 33c, and the brake member 33 is urged in the axial direction (motor body 2 side).

  As shown in FIGS. 2 and 5, in the brake member 33, an annular brake surface 33 h is formed on the end surface of the spring support portion 33 c on the motor body 2 side. The brake surface 33h is formed on the outer peripheral edge of the bottom 33d of the spring support 33c so as to be continuous with the side wall 33e of the spring support 33c. The brake surface 33h is an inclined surface that decreases in diameter toward the motor main body 2 side, and the inclined angle is formed to be 45 ° with respect to the axis.

  As shown in FIGS. 2A and 2B, the brake surface 33 h can come into contact with an annular fixed friction member (fixed friction portion) 40 fixed in the brake housing recess 21 d of the gear housing 21. ing. The fixed friction member 40 is made of a metal material and has a tapered shape. Four fixed pieces 40a are formed in the fixed friction member 40 at equal intervals in the circumferential direction, and the fixed friction member 40 is fixed to the brake accommodating recess 21d by the fixed pieces 40a. In addition, the friction surface 40b that contacts the brake member 33 has an inclination of 45 ° with respect to the axis similarly to the brake surface 33h, so that a large frictional force can be generated between the friction surface 40b and the brake surface 33h. Further, the friction surface 40b is formed on a rough surface by shot peening so that a frictional force with the brake surface 33h is easily generated. In the present embodiment, the brake member 33, the fixed friction member 40, and the coil spring 34 constitute a brake mechanism.

  As shown in FIGS. 2 and 5, the end of the brake member 33 on the motor main body 2 side has an annular shape as first locking means extending in the axial direction (motor main body 2 side) from the inner periphery of the brake surface 33 h. The locking portion 33i is formed in a continuous annular shape, and a locking projection 33j that protrudes toward the inner peripheral side is formed at the extended tip of the annular locking portion 33i. The flange portion 31d of the drive side rotating body 31 is accommodated and disposed on the inner peripheral side of the annular locking portion 33i, and the locking protrusion 33j of the annular locking portion 33i is axially provided on the peripheral edge portion of the flange portion 31d. It can be locked (see FIG. 2).

  Further, a cam groove 33k having the same shape as the cam groove 31f of the drive side rotating body 31 is provided on the tip end surface (end surface on the motor body 2 side) of the cylindrical portion 33a of the brake member 33 on the inner peripheral side of the annular locking portion 33i. Three are formed at equal intervals in the direction. The front end surface of the cylindrical portion 33a of the brake member 33 is disposed to face the flange portion 31d of the driving side rotating body 31 in the axial direction, and each cam groove 33k of the brake member 33 and each cam groove 31f of the driving side rotating body 31 are in the axial direction. And spherical bodies 37 are interposed between the cam grooves 31f and 33k (see FIG. 2A).

  Each cam groove 31f, 33k can accommodate substantially half of the sphere 37 at the center in the circumferential direction, and the radial width of each cam groove 31f, 33k is greater than the diameter of the sphere 37 at locations other than the center in the circumferential direction. Is also narrower. Therefore, when the sphere 37 moves relative to the circumferential ends of the cam grooves 31f and 33k due to the rotation of the drive side rotator 31, the sphere 37 moves from the cam grooves 31f of the drive side rotator 31 in the axial direction. It is designed to protrude. On the other hand, when the positions of the center in the circumferential direction of the cam grooves 31f and 33k substantially coincide with each other, the spherical body 37 is accommodated in each of the cam grooves 31f and 33k. In addition, since each cam groove 31f and 33k always accommodates a part of the sphere 37, the sphere 37 is prevented from falling off.

[Brake operation]
In the brake device 30 as described above, when the motor main body 2 is not driven, that is, when no rotational force is input to the driving side rotating body 31, the cam groove 31 f of the driving side rotating body 31 and the cam groove of the brake member 33. 33k is located at the same position in the circumferential direction, and the sphere 37 is located at the center in the circumferential direction between the cam grooves 31f and 33k. Further, the brake member 33 receives an urging force from the coil spring 34 and is brought into pressure contact with the friction surface 40b of the fixed friction member 40, and is positioned at an engagement position where the brake member 33 is engaged with the fixed friction member 40 in the rotation direction. In this state, the rotation of the brake member 33 and the driven rotary body 32 is restricted by the frictional force generated between the brake surface 33h of the brake member 33 and the friction surface 40b of the fixed friction member 40. As a result, the rotation of the worm shaft 22, the worm wheel 23, and the output shaft 24 is restricted, so that the fall of the wind glass and the opening operation of the malicious person's wind glass are prevented, thereby preventing the vehicle from being stolen.

  On the other hand, when the motor main body 2 is driven and the drive-side rotator 31 rotates, the cam groove 31 f of the drive-side rotator 31 is shifted in the rotation direction with respect to the cam groove 33 k of the brake member 33. At this time, the sphere 37 protrudes in the axial direction from the cam groove 31f of the drive side rotating body 31 while moving relative to the circumferential end of each cam groove 31f, 33k while rolling, and the brake member 33 is attached to the coil spring 34. Press against the forces. As a result, the brake member 33 moves away from the friction surface 40b of the fixed friction member 40 and moves to a non-engagement position where the brake member 33 becomes non-engaged with the fixed friction member 40 in the rotational direction. When the brake member 33 is in the disengaged state, the elastomer 36a of the rotation transmitting portion 31c (driving side rotating body 31) contacts the contact recess 32e of the rotating engaging portion 32d (driven side rotating body 32) in the rotation direction. Touch. Thereby, the rotational force of the driving side rotating body 31 can be transmitted to the driven side rotating body 32, and the driving side rotating body 31 and the driven side rotating body 32 rotate integrally. In addition, since the rotation transmission part 31c contacts with the contact recessed part 32e of the driven side rotary body 32 via the elastomer 36a, the impact at the moment of the contact, or the impact when the rotation transmission part 31c separates from the contact recessed part 32e. Can be suppressed.

[Brake device assembly]
When the brake device 30 is assembled to the motor 1, first, the brake device 30 is assembled and unitized, and then the unitized brake device 30 is assembled to the motor 1. When the brake device 30 is assembled to form a unit, the coil spring 34 is inserted into the cylindrical portion 32 a of the driven side rotating body 32 and placed on the spring support portion 32 f of the driven side rotating body 32. Thereafter, the cylindrical portion 32a of the driven-side rotator 32 is inserted into the cylindrical portion 33a of the brake member 33, and the engaging protrusions 32k and 33g of the driven-side rotator 32 and the brake member 33 are locked in the axial direction. (See FIG. 6). As a result, the brake member 33 cannot be detached from the driven side rotating body 32. Since the coil spring 34 urges the driven-side rotator 32 and the brake member 33 in a direction to separate them, the engagement state of the engagement protrusions 32k and 33g is maintained.

  On the other hand, the drive-side rotator 31 is inserted into the annular locking portion 33i of the brake member 33 in which the sphere 37 is placed in the cam groove 33k, and each rotation transmission portion 31c is connected to each rotation engagement of the driven-side rotator 32. Arranged between the portions 32d. When the drive-side rotator 31 is inserted, the annular locking portion 33i is once bent to the outer peripheral side by the flange portion 31d of the drive-side rotator 31, and returns elastically when the flange portion 31d passes through. Note that the locking protrusion 33j of the annular locking portion 33i has an inclined surface on the insertion side of the driving side rotating body 31, and the driving side rotating body 31 is easily inserted by the inclined surface. After the elastic return of the annular locking portion 33i, the locking protrusion 33j is positioned on the upper side of the flange portion 31d (on the counter driven side rotating body 32 side), and the driving side rotating body 31 cannot be detached from the brake member 33. As described above, the brake device 30 is unitized by assembling the driving side rotating body 31 and the driven side rotating body 32 to the brake member 33 so as not to be detached.

  When the unitized brake device 30 is assembled to the motor 1, the brake device 30 is housed in the brake housing recess 21 d of the gear housing 21, and the worm shaft 22 is fixed to the driven side rotating body 32. Thereafter, the fixed friction member 40 is placed on the brake surface 33 h of the brake member 33, and the brake member 33 is pushed against the urging force of the coil spring 34 by the fixed friction member 40 toward the driven side rotating body 32. The fixed friction member 40 is fixed to the brake accommodating recess 21d. As a result, the brake member 33 is disposed at the engagement position, and a gap that allows the brake member 33 to move in the axial direction is formed between the engagement protrusions 32k and 33g of the driven-side rotator 32 and the brake member 33. Is done.

  Thereafter, the rotating shaft 10 of the motor main body 2 is fixed to the driving side rotating body 31, and the axial movement of the brake member 33 is also performed between the flange portion 31d of the driving side rotating body 31 and the locking projection 33j of the brake member 33. A gap that allows the As a result, the brake member 33 can move between two positions, an engaged position and a non-engaged position. As described above, the brake device 30 is assembled to the motor body 2 and the speed reduction unit 3 to complete the motor 1.

Next, characteristic effects of the present embodiment will be described.
(1) In the present embodiment, the drive-side rotator 31 and the driven-side rotator 32 are locked between the drive-side rotator 31 and the brake member 33 so as to be separably engageable with the brake member 33. An annular locking portion 33i as one locking means is provided between the driven side rotating body 32 and the brake member 33, with a driven side locking portion 32j and a brake side locking portion 33f as second locking means. As a result, the brake device 30 can be assembled as a unit (integrated) independently from the assembly to the motor 1, so that the assembly to the motor 1 can be facilitated. Further, since the brake device 30 can be produced in a lump, it can contribute to an improvement in production efficiency.

  (2) In the present embodiment, the second locking means includes a driven side locking portion 32j extending in the axial direction (rotating shaft 10 side) from the driven side rotating body 32 and an axial direction (warm) from the brake member 33. And the driven side locking portion 32j and the brake side locking portion 33f are locked in the axial direction, so that the driven side rotating body 32 is provided. The brake member 33 can be locked so as not to be detached.

  (3) In the present embodiment, an elastomer 36a as a buffer member is provided between the rotation transmission portion 31c and the rotation engagement portion 32d in the rotation direction, and therefore, between the rotation transmission portion 31c and the rotation engagement portion 32d. For example, it is possible to suppress an impact that occurs when a rotational force is transmitted. Moreover, since the elastomer 36a as a buffer member is provided in the brake device 30, it can be provided in a portion before the deceleration by the deceleration unit 3. As a result, the buffer member can be configured to be smaller than the case where the buffer member is provided in the portion after deceleration and configured to receive a large rotational force after deceleration, which can contribute to the miniaturization of the motor 1.

  (4) In this embodiment, since the elastomer 36a is integrally formed with the rotation transmitting portion 31c, the number of parts can be reduced compared to the case where the buffer member is provided separately, and the assembly of the brake device 30 is facilitated. .

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the annular locking portion 33i is provided as the first locking means. However, the present invention is not particularly limited to this. For example, as shown in FIG. 7, the inside of the cylindrical portion 32a of the brake member 33 You may comprise from the latching groove | channel 50 formed in the surrounding surface, and the latching protrusion 51 formed in the outer peripheral side end surface of each rotation transmission part 31c of the drive side rotary body 31. FIG. The locking groove 50 is continuously formed in the circumferential direction, the locking protrusion 51 is formed so as to protrude outward in the radial direction, and the locking protrusion 51 is located in the locking groove 50. The locking groove 50 and the locking protrusion 51 can be locked in the axial direction, and the driving-side rotating body 31 cannot be detached from the brake member 33 by the locking groove 50 and the locking protrusion 51. In the assembled state of the brake device 30, a gap that allows the brake member 33 to move in the axial direction is formed between the locking groove 50 and the locking projection 51. According to such a configuration, the first locking means can be configured while preventing the brake device 30 from being enlarged in the axial direction. Further, a separate locking member may be provided as the first locking means.

-In above-mentioned embodiment, although the cyclic | annular latching | locking part 33i was formed continuously along the circumferential direction, you may divide | segment and provide as one or some latching protrusion.
In the above-described embodiment, two driven side locking portions 32j and two brake side locking portions 33f are provided. However, the present invention is not particularly limited to this, and one or three or more may be provided. Good.

In the above embodiment, the engagement protrusions 32k and 33g of the driven side rotating body 32 and the brake member 33 protrude in the circumferential direction, but may be protruded in the radial direction.
In the above embodiment, the second locking means is constituted by the driven side locking portion 32j and the brake side locking portion 33f formed in the spring support portions 32f and 33c of the driven side rotating body 32 and the brake member 33. However, other than this, for example, it may be formed in each of the cylindrical portions 32a and 33a of the driven side rotating body 32 and the brake member 33, or a separate locking member may be provided as the second locking means. Good.

  In the above embodiment, the elastomer 36a as the buffer member is integrally formed with the rotation transmitting portion 31c of the driving side rotating body 31, but may be integrally formed with the rotation engaging portion 32d of the driven side rotating body 32. Alternatively, both the rotation transmitting portion 31c and the rotation engaging portion 32d may be integrally formed. Moreover, you may interpose between the rotation transmission part 31c and the rotation engaging part 32d as a different body. In addition, the elastomer may be outsert-molded on at least one of the entire side surface of the cylindrical portion 31a and the rotation transmitting portion 31c of the driving side rotating body 31 and the entire side surface of the rotation engaging portion 32d of the driven side rotating body 32. Good.

In the above embodiment, the elastomer 36a is used as the buffer member, but is not particularly limited thereto.
In the above embodiment, the fixed friction member 40 is provided as a separate member with respect to the brake housing recess 21d of the gear housing 21, but a fixed friction portion may be formed on the inner surface of the brake housing recess 21d.

  In the above embodiment, the coil spring 34 is used as the urging means for urging the brake member 33. However, the present invention is not particularly limited to this, and for example, a leaf spring or the like may be used.

In the above embodiment, the worm shaft 22 constituting the speed reduction mechanism is used as the driven shaft. However, the present invention is not particularly limited thereto, and for example, a driven shaft having a flat gear may be used.
In the above embodiment, the present invention is embodied in a motor for a power window that opens and closes the window glass of an automobile.

The sectional side view of the motor in this embodiment. (A) Side sectional view which shows a brake device, (b) Flat sectional view which shows a brake device. (A) The top view which looked at the drive side rotary body from the worm shaft side, (b) AA sectional drawing of a drive side rotary body, (c) BB sectional drawing of a drive side rotary body. (A) The top view which looked at the driven side rotary body from the worm shaft side, (b) CC sectional drawing of the driven side rotary body, (c) The top view which looked at the driven side rotary body from the rotating shaft side. (A) The top view which looked at the brake member from the worm shaft side, (b) The top view which looked at the brake member from the rotating shaft side, (c) The fragmentary sectional view of a brake member. The side view which shows a part of brake device. The sectional side view which shows the brake device of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Motor main body, 3 ... Deceleration part, 10 ... Rotating shaft as a drive shaft, 22 ... Worm shaft as a driven shaft, 30 ... Brake apparatus, 31 ... Drive side rotary body, 31c ... Rotation transmission part, 32 ... driven-side rotating body, 32d ... rotation engaging portion, 32j ... driven-side locking portion constituting second locking means, 33 ... brake member, 33f ... brake-side locking portion constituting second locking means. 33i, an annular locking portion as a first locking means, 34, a coil spring as a biasing member, 36a, an elastomer as a buffer member, 40, a fixed friction member (fixed friction portion).

Claims (5)

A driving side rotating body coupled to the driving shaft so as to be integrally rotatable;
A driven side rotating body coupled to a driven shaft coaxially arranged with the drive shaft so as to be integrally rotatable;
A brake member, which is provided so as to rotate integrally with the driven-side rotator between the drive-side rotator and the driven-side rotator, receives a biasing force of the biasing member against the fixed friction portion and rotates. An engagement position that engages in a direction, and a fixed friction portion that is separated from the urging force of the urging member so as to move between two positions of a non-engagement position that is disengaged in the rotation direction. A brake mechanism provided, and at the time of rotation input from the drive shaft side, the brake member is switched to the non-engagement position by the rotational force from the drive side rotating body to rotate the drive shaft to the driven shaft. A brake device that allows transmission and maintains rotation of the driven shaft by maintaining the brake member at the engagement position at the time of rotation input from the driven shaft side;
A first locking means is provided between the driving side rotating body and the brake member so that the driving side rotating body and the driven side rotating body can be locked in a non-detachable manner with respect to the brake member. A brake device comprising a second locking means between a side rotating body and the brake member. The brake device according to claim 1, wherein
The second locking means includes a driven side locking portion extending from the driven side rotating body to the axial direction drive shaft side, and a brake side relationship extending from the brake member to the axial direction driven shaft side. A brake device comprising: a stop portion, wherein the driven side locking portion and the brake side locking portion are locked in the axial direction. The brake device according to claim 1 or 2,
The drive-side rotator is provided with a rotation transmission unit for transmitting the rotation of the drive-side rotator to the driven-side rotator.
The driven rotating body is provided with a rotation engaging portion that can engage with the rotation transmitting portion in the rotation direction,
A brake device, wherein a buffer member is provided between the rotation transmitting portion and the rotation engaging portion in the rotation direction. The brake device according to claim 3,
The brake device, wherein the buffer member is integrally formed with at least one of the rotation transmitting portion and the rotation engaging portion. A motor with a speed reduction mechanism in which a motor main body that rotationally drives a rotation shaft and a speed reduction portion having a worm shaft that is arranged coaxially with the rotation shaft,
A motor with a speed reduction mechanism, wherein the brake device according to any one of claims 1 to 4 is assembled between the rotating shaft and the worm shaft.

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