JP2012060750A - Motor including speed reduction mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve layout characteristics of a motor including a speed reduction mechanism.SOLUTION: A wiper motor 10 includes: a motor body 11 having a motor case 13 rotatably supporting one end in the axial direction of a motor shaft 17; an output shaft 28 to which output of the motor shaft 17 is transmitted via the speed reduction mechanism; and a gear case 25 storing the speed reduction mechanism and rotatably supporting the output shaft 28. The motor case 13 is formed to have a cross section including a pair of flat parts 13a extended in parallel with each other and a pair of arcuate parts 13b interconnecting ends of the pair of flat parts 13a, and has a flat shape in which a direction in parallel with the flat parts 13a is a long side. The axial direction of the output shaft 28 and the axial direction of the motor shaft 17 are arranged to be orthogonal to each other, and the axial direction of the output shaft 28 and the flat parts 13a of the motor case 13 are arranged to be inclined to each other.

Description

  The present invention relates to a motor with a speed reduction mechanism that includes a speed reduction mechanism that transmits the rotation of an electric motor at a reduced speed.

  For example, in a rear wiper device for wiping a rear window glass provided in a vehicle such as an automobile, a motor with a speed reduction mechanism is used as a drive source for driving a wiper member. The motor with a speed reduction mechanism has an electric motor such as a motor with a brush, and one axial end of the motor shaft is rotatably supported by a yoke. The gear case attached to the yoke houses a speed reduction mechanism consisting of a worm rotated by a motor shaft and a worm wheel meshing with the worm, and the output of the electric motor is decelerated by the speed reduction mechanism and transmitted to the output shaft. Is done. The gear case includes a bottomed gear frame that houses the speed reduction mechanism, and a gear cover that closes the opening of the gear frame, and the output shaft is rotatably supported by the bottom wall of the gear frame. Such a motor with a speed reduction mechanism is described in Patent Documents 1 and 2, for example.

  A motor with a speed reduction mechanism provided in a vehicle such as an automobile includes a pair of flat portions extending in parallel with each other and a pair of arc portions connecting ends of the pair of flat portions to reduce the size of the electric motor. The bottomed cylindrical yoke formed in the cross-sectional shape provided with these is used. This yoke is formed in a flat shape in which the direction parallel to the flat part is the long side and the direction orthogonal to the flat part is the short side. As described in Patent Documents 1 and 2, in a conventional motor with a speed reduction mechanism, a gear case is attached to the yoke in a state where the axial direction of the output shaft is arranged perpendicular to the flat portion of the yoke, thereby providing a speed reduction mechanism. The motor is made thinner. In other words, by arranging the short side of the yoke in the axial direction of the output shaft, the yoke is prevented from projecting in the axial direction of the output shaft with respect to the gear case.

JP 2001-251808 A JP 2006-151092 A

  By the way, when such a motor with a speed reduction mechanism is used for a wiper motor or the like, the motor with a speed reduction mechanism is attached to the vehicle body in a state where the axial direction of the output shaft is inclined with respect to the vehicle body. At this time, as described above, when the axial direction of the output shaft is arranged perpendicular to the flat part of the yoke, the flat part on the long side of the yoke is arranged parallel to the bottom wall of the gear frame. When viewed from the axial direction of the motor shaft, the motor case largely protrudes to one side in the horizontal direction with respect to the position of the output shaft. Therefore, when mounting the motor with a speed reduction mechanism in a limited space inside the vehicle body, if the axial direction of the output shaft is arranged perpendicular to the flat portion of the yoke, the layout is poor, and the motor with the speed reduction mechanism A sufficient clearance between the vehicle body and the vehicle body cannot be secured.

  An object of the present invention is to improve the layout of a motor with a speed reduction mechanism.

  The motor with a speed reduction mechanism of the present invention is formed in a cross-sectional shape including a pair of flat portions extending in parallel with each other and a pair of arc portions connecting the ends of the pair of flat portions, and the axial direction of the motor shaft A bottomed cylindrical yoke that rotatably supports one end and an output of the motor shaft via a speed reduction mechanism that is disposed perpendicular to the axial direction of the motor shaft and transmits the output of the motor shaft at a reduced speed. Is attached to the yoke in a state where the axial direction of the output shaft is inclined with respect to the flat portion of the yoke, and accommodates the speed reduction mechanism and rotatably supports the output shaft. And a gear case.

  The motor with a speed reduction mechanism of the present invention is characterized in that a wiper member for wiping the wiping surface is attached to the tip of the output shaft.

  According to the present invention, the axial direction of the output shaft and the axial direction of the motor shaft are arranged perpendicular to each other, and the axial direction of the output shaft and the flat portion of the yoke are arranged to be inclined with respect to each other. The clearance between the yoke and the vehicle body can be sufficiently ensured without changing the internal structure of the gear case, and the layout of the motor with a speed reduction mechanism can be improved.

It is a top view which shows the wiper motor which is one embodiment of this invention. It is sectional drawing which follows the AA line in FIG. It is sectional drawing which follows the BB line in FIG. 1 which shows the cross-sectional shape of a motor case. It is the schematic which shows the attachment state to the vehicle body of a wiper motor. It is the schematic which shows the attachment state to the vehicle body of the wiper motor as a comparative example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A wiper motor 10 shown in FIG. 1 is used as a drive source of a rear wiper device for wiping a rear window glass provided in a vehicle such as an automobile. The wiper motor 10 is a motor with a speed reduction mechanism, and includes a motor main body (electric motor) 11 and a gear unit portion 12 provided with a speed reduction mechanism for reducing and transmitting the output of the motor main body 11.

  The motor body 11 is a DC motor with a brush, and includes a motor case (yoke) 13 formed into a bottomed cylindrical shape by pressing a thin steel plate. As shown in FIG. 3, the motor case 13 has a substantially oval cross section with a pair of flat portions 13a extending in parallel to each other and a pair of arc portions 13b connecting the ends of the pair of flat portions 13a. It has a flat shape in which the direction parallel to the flat portion 13a is the long side and the direction perpendicular to the flat portion 13a is the short side. That is, the dimension La of the motor case 13 in the direction parallel to the flat part 13a is set larger than the dimension Lb of the motor case 13 in the direction orthogonal to the flat part 13a.

  A pair of arc-shaped permanent magnets 14 which are located on the inner peripheral surface of the motor case 13 on the side of the pair of arc portions 13b and are respectively magnetized in the N-pole and S-pole toward the radially inner side face each other. And is fixed. An armature 15 that faces each permanent magnet 14 via a minute gap is rotatably accommodated in the motor case 13, and a plurality of coils 16 are wound around the armature 15. A motor shaft 17 penetrates and is fixed to the rotation center of the armature 15, and one end in the axial direction of the motor shaft 17 is rotatably supported on the bottom wall of the motor case 13.

  A cylindrical commutator 18 is fixed to the motor shaft 17 adjacent to the armature 15, and the end of each coil 16 is electrically connected to the commutator 18. A pair of brushes 19 are slidably contacted with the outer peripheral surface of the commutator 18, and a drive current is supplied to the coil 16 via each brush 19 and the commutator 18, whereby electromagnetic force torque in the rotational direction is generated in the armature 15. The motor shaft 17 is rotationally driven at a predetermined rotational speed.

  A gear frame 21 of the gear unit portion 12 is attached to the motor body 11 on the opening side of the motor case 13. The gear frame 21 is open to the motor case 13 side, and the gear frame 21 is fixed to the motor case 13 by a fastening screw 22 in a state where the respective opening end faces abut each other. The other axial end of the motor shaft 17 is inserted into the gear frame 21, and a worm 23 having a helical tooth portion is integrally formed on the outer peripheral surface of the other axial end of the motor shaft 17. ing.

  As shown in FIG. 2, the gear frame 21 is formed in a bottomed shape that opens to the side orthogonal to the axial direction of the motor shaft 17 by aluminum die casting, and a gear case 25 is formed by a gear cover 24 that closes the opening. is doing. That is, the gear cover 24 is disposed at a predetermined distance from the bottom wall 21 a of the gear frame 21, and an accommodation space is formed between the bottom wall 21 a of the gear frame 21 and the gear cover 24. Inside the gear frame 21, a speed reduction mechanism 26 that reduces and transmits the rotation (output) of the motor shaft 17, and a motion conversion that converts the rotational motion of the speed reduction mechanism 26 into a swing motion and transmits it to the output shaft 28. A mechanism 29 is accommodated.

  The wiper motor 10 shown in FIG. 1 is a plan view with the gear cover 24 removed, and shows the internal structure of the gear frame 21. The gear cover 24 is formed in a predetermined shape from a steel plate or the like, and the wiper motor 10 is fixed to the vehicle body at a bracket portion (not shown) provided integrally with the gear cover 24. In the present embodiment, the gear frame 21 is formed in a bottomed shape by aluminum die casting. However, the present invention is not limited to this, and the gear frame 21 may be formed of resin or other material.

  The output shaft 28 is made of a round bar made of metal such as steel, and the axial direction thereof is arranged in a direction orthogonal to the axial direction of the motor shaft 17, that is, in a direction orthogonal to the bottom wall 21 a of the gear frame 21. The output shaft 28 is housed in the gear frame 21 at the base end side, and protrudes outward from the gear frame 21 and extends through the bottom wall 21 a of the gear frame 21. The bottom wall 21a of the gear frame 21 is integrally formed with a substantially cylindrical shaft holding portion 21b that protrudes outward from the gear frame 21 along the outer peripheral surface of the output shaft 28. It is inserted through the portion 21b and is rotatably supported by the shaft holding portion 21b. As shown in FIG. 4, the front end portion of the output shaft 28 protrudes from the rear window glass G to the outside of the vehicle body, and the front end portion of the output shaft 28 has an outer surface of the rear window glass G as a wiping surface. A wiper member 32 for wiping is attached.

  A resin bearing member 33 is provided between the inner peripheral surface of the shaft holding portion 21b and the outer peripheral surface of the output shaft 28, and the output shaft 28 is rotatably supported by the shaft holding portion 21b via the bearing member 33. ing. Further, a seal material 34 is attached to the tip of the shaft holding portion 21b, and rainwater, dust, and the like are prevented from entering the gear frame 21.

  The speed reduction mechanism 26 includes a worm 23 that is rotated by the motor body 11 and a worm wheel 35 that meshes with the worm 23. The worm wheel 35 is formed in a substantially disk shape by injection molding of a resin material, and has a tooth portion that meshes with the worm 23 on the outer peripheral surface thereof. A rotation shaft 36 fixed to the bottom wall 21 a and extending in parallel with the output shaft 28 is inserted through the shaft center of the worm wheel 35, and the worm wheel 35 is rotatably supported inside the gear frame 21 by the rotation shaft 36. Has been. The rotation of the motor shaft 17 is decelerated and transmitted to the worm wheel 35 by the decelerating mechanism 26 including the worm 23 and the worm wheel 35.

  The motion conversion mechanism 29 includes a pinion gear 40 fixed to the base end portion of the output shaft 28, a motion conversion member 41 that converts the rotational motion of the worm wheel 35 into a swing motion and transmits it to the pinion gear 40, and motion conversion with the pinion gear 40. A holding plate 42 is provided to connect the member 41 to each other so as to be swingable. The motion conversion member 41 includes a sector gear portion 41a that meshes with the pinion gear 40 and an arm portion 41b that is connected to the worm wheel 35, and is formed into a flat plate shape from a metal material such as a steel plate.

  As shown in FIG. 2, the motion converting member 41 is disposed closer to the gear cover 24 than the worm wheel 35. A connection shaft 43 that is rotatably inserted into any one of a plurality of connection holes 35 a formed in the worm wheel 35 is fixed to the end of the arm portion 41 b of the motion conversion member 41. That is, the motion conversion member 41 and the worm wheel 35 are rotatably connected to each other by the connecting shaft 43 provided at a position shifted in the radial direction from the axial center of the worm wheel 35. The pinion gear 40 is a spur gear, and is fixed to the base end portion of the output shaft 28 and rotated integrally with the output shaft 28. The pinion gear 40 is disposed on the same plane as the motion converting member 41 and meshes with a sector gear portion 41a formed of a substantially fan-shaped spur gear.

  The holding plate 42 is formed in a flat plate shape by a metal material such as a steel plate. The holding plate 42 is disposed closer to the gear cover 24 than the pinion gear 40 and the motion conversion member 41, and extends between the pinion gear 40 and the sector gear portion 41a. A gear shaft 44 extending in parallel with the output shaft 28 and the connecting shaft 43 is rotatably inserted into one end portion of the holding plate 42, and the gear shaft 44 is fixed to the center of the sector gear portion 41a. On the other hand, the output shaft 28 is rotatably inserted into the other end portion of the holding plate 42. By this holding plate 42, the gear shaft 44 is swingably connected to the output shaft 28, and the pinion gear 40 and the sector gear portion 41 a are held in mesh with each other.

  When the worm wheel 35 is rotated by the motion converting mechanism 29 having the differential gear structure, the connecting shaft 43 fixed to the arm portion 41b of the motion converting member 41 is rotated around the rotating shaft 36 together with the worm wheel 35. . Then, the gear shaft 44 fixed to the sector gear portion 41a of the motion converting member 41 is swung around the output shaft 28, and the output shaft 28 reciprocally swings within a predetermined angle range by the engagement of the sector gear portion 41a and the pinion gear 40. Is done. In other words, the rotational motion of the worm wheel 35 is converted into a swing motion by the motion conversion mechanism 29 and transmitted to the output shaft 28, and the wiper member 32 moves between a predetermined swing range, that is, between a preset stop position and reverse position. Is driven to swing.

  Sliding members 45 that are slidably abutted against the inner surface of the gear cover 24 are mounted on the base end portions of the output shaft 28, the connecting shaft 43, and the gear shaft 44, respectively. The sliding contact member 45 is formed in a cap shape by an elastic material such as rubber, and is assembled in a compressed state between the base end surfaces of the shafts 28, 43, 44 and the inner surface of the gear cover 24. Due to the elastic force of the sliding contact member 45, the shafts 28, 43, 44 are urged in the axial direction toward the bottom wall 21 a side of the gear frame 21, and the axial direction of each member housed inside the gear frame 21 The backlash is suppressed.

  FIG. 4 is a schematic view showing a state where the wiper motor is attached to the vehicle body. 4 is the vehicle upper side, the front and back direction in FIG. 4 is the vehicle left-right direction (horizontal direction), and the left-right direction in FIG. 4 is the vehicle front-rear direction (horizontal direction). 1 is the vehicle upper side in the direction along the rear window glass G when attached to the vehicle body, and the left and right direction in FIG. 1 is the vehicle left and right direction when attached to the vehicle body. Is shown.

  As shown in FIG. 4, the wiper motor 10 is configured so that the grease applied to the meshing portion of the speed reduction mechanism 26 is prevented from adhering to the commutator 18 so that the axial direction of the motor shaft 17 is directed horizontally in the vehicle left-right direction. In this state, it is attached to the inside of the vehicle body B. When the wiper motor 10 is attached to the vehicle body, a through hole (not shown) for projecting the tip of the output shaft 28 from the rear window glass G is disposed on the vehicle upper side with respect to the motor body 11. Therefore, when the wiper motor 10 is mounted on the vehicle body so that the axial direction of the motor shaft 17 is horizontal, the layout is better when the position of the output shaft 28 is arranged on the vehicle upper side as much as possible with respect to the motor body 11, It becomes easy to attach the wiper motor 10 to the vehicle body.

  Therefore, in the wiper motor 10, as shown in FIG. 1, the output shaft 28 is arranged such that the shaft center C1 of the output shaft 28 is located farther from the axis C of the motor shaft 17 than the shaft center C2 of the worm wheel 35. 28 positions are set. That is, as compared with the case where the shaft center of the output shaft is arranged closer to the axis of the motor shaft than the shaft center of the worm wheel as in the wiper motor described in Patent Document 2, the motor is moved from the shaft center C1 of the output shaft 28 to the motor. The position of the output shaft 28 is set so that the perpendicular distance L lowered with respect to the axis C of the shaft 17 is increased. As a result, the distance L between the output shaft 28 and the motor shaft 17 is increased as shown in FIG. Will be placed. Therefore, it is possible to prevent the motor body 11 and the rear window glass G from wrapping (overlap with a predetermined interval), and the wiper motor 10 can be easily attached to the vehicle body.

  Further, the position of the output shaft 28 is set so that the shaft center C1 of the output shaft 28 is arranged closer to the motor case 13 in the axial direction of the motor shaft 17 than the shaft center C2 of the worm wheel 35. That is, as compared with the case where the shaft center of the output shaft is arranged on the opposite side of the motor case in the axial direction of the motor shaft from the shaft center of the worm wheel as in the wiper motor shown in FIG. The position of the output shaft 28 is set so that the distance M between the axial center C1 of the output shaft 28 and the tip of the motor case 13 in the axial direction of the shaft 17 is small. As a result, the motor case 13 can be prevented from projecting to one side in the horizontal direction (one axial end side of the motor shaft 17) with respect to the position of the output shaft 28, and the wiper motor 10 is limited to a limited space inside the vehicle body. Can be easily arranged.

  As described above, the shaft center C1 of the output shaft 28 is closer to the motor case 13 in the axial direction of the motor shaft 17 than the shaft center C2 of the worm wheel 35, and from the axis C of the motor shaft 17 to the shaft center C2 of the worm wheel 35. By disposing at a distant position, the layout of the wiper motor 10 is improved and the wiper motor 10 is downsized.

  As shown in FIG. 4, the wiper motor 10 is configured so that the wiper member 32 attached to the distal end portion of the output shaft 28 can swing along the outer surface of the rear window glass G in the axial direction of the output shaft 28. Is attached to the inside of the vehicle body B in a state of being substantially orthogonal to the rear window glass G. When the wiper motor 10 is attached to the vehicle body, the axial direction of the output shaft 28 is inclined with respect to the vehicle body B, and the bottom wall 21 a of the gear frame 21 and the plane of the gear cover 24 are viewed from the axial direction of the motor shaft 17. Is disposed to be inclined with respect to the vehicle body B. Therefore, when the wiper motor 10 is mounted on the vehicle body so that the axial direction of the output shaft 28 is inclined with respect to the vehicle body, the horizontal dimension E1 of the wiper motor 10 viewed from the axial direction of the motor shaft 17 is as small as possible. When the wiper motor 10 is formed, the layout is good and the wiper motor 10 is easily attached to the vehicle body.

  Therefore, in the wiper motor 10, the gear frame 21 is attached to the motor case 13 in a state where the axial direction of the output shaft 28 is inclined with respect to the flat portion 13 a of the motor case 13. That is, when viewed from the axial direction of the motor shaft 17, the axial center line C1 of the output shaft 28 and the straight line D parallel to the flat portion 13a of the motor case 13 are arranged so as to be inclined by a predetermined angle α. The flat portion 13 a of the case 13 is inclined with respect to the bottom wall 21 a of the gear frame 21 and the plane of the gear cover 24. The wiper motor 10 is attached to the vehicle body so that the flat portion 13a of the motor case 13 is substantially parallel to the vehicle body B and the direction along the flat portion 13a is directed to the vertical direction.

  FIG. 5 is a schematic view showing a state where the wiper motor as a comparative example is attached to the vehicle body, and shows a wiper motor 50 in which the axial direction of the output shaft 28 is arranged perpendicular to the flat portion 13a of the motor case 13 as a comparative example. Yes. In addition, the same code | symbol is attached | subjected to the member similar to the member mentioned above in FIG. 5, and the description is abbreviate | omitted. In the wiper motor 50, the gear frame 21 is attached to the motor case 13 in a state where the axial direction of the output shaft 28 is arranged perpendicular to the flat portion 13 a of the motor case 13. That is, when viewed from the axial direction of the motor shaft 17, the axial center line C 1 of the output shaft 28 and the straight line D parallel to the flat portion 13 a of the motor case 13 are arranged perpendicular to each other. 13 a is provided in parallel to the bottom wall 21 a of the gear frame 21 and the plane of the gear cover 24. The wiper motor 10 is attached to the vehicle body so that the flat portion 13a of the motor case 13 is inclined with respect to the vehicle body B.

  In the wiper motor 50, the flat portion 13 a on the long side of the motor case 13 is arranged in parallel to the bottom wall 21 a of the gear frame 21. Therefore, when the wiper motor 50 is attached to the vehicle body with the axial direction of the output shaft 28 tilted with respect to the vehicle body B, the motor case 13 with respect to the position of the output shaft 28 when viewed from the axial direction of the motor shaft 17. Greatly protrudes toward one side in the horizontal direction toward the vehicle body B side. Therefore, a sufficient clearance between the wiper motor 10 and the vehicle body B cannot be ensured, and the work of attaching the wiper motor 50 to the vehicle body becomes complicated.

  On the other hand, in the wiper motor 10 shown in FIG. 4, the long side flat portion 13 a of the motor case 13 is inclined with respect to the bottom wall 21 a of the gear frame 21 so that the short side of the motor case 13 faces the horizontal direction. Has been. Therefore, when the wiper motor 10 is attached to the vehicle body with the axial direction of the output shaft 28 inclined relative to the vehicle body B as compared with the wiper motor 50 shown in FIG. 5, the output shaft is viewed from the axial direction of the motor shaft 17. It is possible to suppress the motor case 13 from projecting to one side in the horizontal direction toward the vehicle body B side with respect to the position 28. That is, the horizontal dimension E1 of the wiper motor 10 viewed from the axial direction of the motor shaft 17 can be made smaller than the horizontal dimension E2 of the wiper motor 50 shown in FIG. 5, and the layout of the wiper motor 10 is improved. be able to. Therefore, even in the wiper motor 10 in which the distance L between the output shaft 28 and the motor shaft 17 is increased as in the present embodiment, a sufficient clearance between the wiper motor 10 and the vehicle body B is ensured. Thus, the wiper motor 10 can be easily attached to the vehicle body, and the contact between the motor case 13 and the vehicle body B can be reliably prevented.

  The wiper motor 10 shown in FIG. 4 rotates the motor case 13 relative to the gear frame 21 by a predetermined angle α around the axis center of the motor shaft 17 in the wiper motor 50 shown in FIG. It has a structure. That is, in the wiper motor 10 shown in FIG. 4, the axial direction of the output shaft 28 and the axial direction of the motor shaft 17 are arranged perpendicular to each other like the wiper motor 50 shown in FIG. The mounting angle has not been changed. Therefore, the axial direction of the output shaft 28 can be inclined with respect to the flat portion 13a of the motor case 13 without changing the structure of the speed reduction mechanism 26 and the motion conversion mechanism 29 accommodated in the gear frame 21. It has become.

  As described above, the axial direction of the output shaft 28 and the axial direction of the motor shaft 17 are disposed perpendicular to each other, and the axial direction of the output shaft 28 and the flat portion 13a of the motor case 13 are disposed so as to be inclined with respect to each other. As a result, a sufficient clearance between the motor case 13 and the vehicle body B can be secured without changing the internal structure of the gear frame 21, and the layout of the wiper motor 10 can be improved.

  In the embodiment, the direction along the flat portion 13a is arranged in the vertical direction so that the flat portion 13a of the motor case 13 is substantially parallel to the vehicle body B. The angle α (0 ° <α <90 °) formed by the axis center line C1 of the output shaft 28 and the straight line D parallel to the flat portion 13a of the motor case 13 can be arbitrarily changed. For example, when the vehicle body B is not formed along the vertical direction, the clearance between the motor case 13 and the vehicle body B is provided by arranging the flat portion 13a of the motor case 13 parallel to the vehicle body B. It is possible to increase the size, and by disposing the flat portion 13a of the motor case 13 in the vertical direction, the horizontal dimension E1 of the wiper motor 10 viewed from the axial direction of the motor shaft 17 can be reduced.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the motor body 11 is not limited to a motor with a brush, and other electric motors such as a brushless motor may be used. The motor with a speed reduction mechanism of the present invention is not limited to a wiper motor provided with a motion conversion mechanism, and can be applied to other motors with a speed reduction mechanism.

10 Wiper motor (motor with reduction mechanism)
11 Motor body 12 Gear unit 13 Motor case (yoke)
13a Flat part 13b Arc part 14 Permanent magnet 15 Armature 16 Coil 17 Motor shaft 18 Commutator 19 Brush 21 Gear frame 21a Bottom wall 21b Shaft holding part 22 Fastening screw 23 Worm 24 Gear cover 25 Gear case 26 Reduction mechanism 28 Output shaft 29 Motion conversion mechanism 32 Wiper member 33 Bearing member 34 Seal material 35 Worm wheel 35a Connecting hole 36 Rotating shaft 40 Pinion gear 41 Motion conversion member 41a Sector gear portion 41b Arm portion 42 Holding plate 43 Connecting shaft 44 Gear shaft 45 Sliding contact member 50 Wiper motor

Claims (2)

Formed in a cross-sectional shape having a pair of flat portions extending in parallel to each other and a pair of arc portions connecting the ends of the pair of flat portions, and has a bottom with a shaft that rotatably supports one axial end of the motor shaft A cylindrical yoke,
An output shaft that is arranged perpendicular to the axial direction of the motor shaft and that transmits the output of the motor shaft via a reduction mechanism that transmits the output of the motor shaft by decelerating,
A gear case that is attached to the yoke in a state in which the axial direction of the output shaft is inclined with respect to the flat portion of the yoke, accommodates the speed reduction mechanism, and rotatably supports the output shaft. A motor with a speed reduction mechanism.   2. The motor with a speed reduction mechanism according to claim 1, wherein a wiper member for wiping the wiping surface is attached to a tip of the output shaft.

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