JP2009195028A - Method of fixing bearing to rotary shaft, rotary shaft assembly and electric motor with speed reduction mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an abnormal noise or vibration of an electric motor with a speed reduction mechanism to which a rotary shaft is attached, and the like, by regulating the movement of the rotary shaft in a shaft direction by unfailingly fixing a bearing to the rotary shaft. <P>SOLUTION: An insertion hole is provided on a gear case for housing the speed reduction mechanism, and an armature shaft 16 of a motor body fixed on the gear case is inserted into the through-hole. A ball bearing 41 is fixed to the insertion hole by press-fitting, and an intermediate portion of the armature shaft 16 is rotatably supported by the ball bearing 41. Also, a stop ring 54 is attached on a groove portion 56 provided on the armature shaft 16, and the ball bearing 41 is pressed to the stop ring 54 via a washer 72 by a push nut 71 inserted into the armature shaft 16. Thus, the ball bearing 41 is sandwiched between the stop ring 54 and the push nut 71 and is fixed on the armature shaft 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for fixing a bearing to a rotary shaft used in an electric motor with a speed reduction mechanism.

  As a drive source for a vehicle wiper device, a power window device, and the like, an electric motor with a speed reduction mechanism, which is a single unit with a speed reduction mechanism attached to a motor body, is used.

  In such an electric motor with a speed reduction mechanism, a worm gear mechanism that is small and can obtain a large reduction ratio is often used as the speed reduction mechanism. In this case, a gear case for housing the speed reduction mechanism is fixed to the yoke of the motor main body, and the rotation shaft of the motor main body protrudes into the gear case through an insertion hole provided in the gear case. Is formed integrally with the protruding portion of the rotating shaft.

On the other hand, in order to rotatably support the rotating shaft, a bearing is provided on the yoke and the gear case. For example, Patent Document 1 describes an electric motor with a speed reduction mechanism in which a bearing is fixed by press-fitting into an insertion hole provided in a gear case, and an intermediate portion of a rotating shaft is rotatably supported by the bearing.
JP 2006-31655 A

  However, in the electric motor with a speed reduction mechanism disclosed in Patent Document 1, the rotary shaft is inserted into the bearing, and the intermediate portion is supported only in the radial direction by the bearing. For this reason, when the shaft swings on the rotating shaft due to the reaction force between the worm and the worm wheel, the rotating shaft may move in the axial direction due to the shaft swing, resulting in abnormal noise or vibration.

  On the other hand, a method of restricting the movement of the rotating shaft in the axial direction by press-fitting the rotating shaft into the bearing can be considered, but this method cannot sufficiently support a large axial load.

  The object of the present invention is to securely fix the bearing to the rotating shaft, thereby restricting the movement of the rotating shaft in the axial direction and preventing abnormal noise and vibration of an electric motor with a speed reduction mechanism provided with the rotating shaft. There is to do.

  A bearing fixing method to a rotating shaft according to the present invention is a bearing fixing method to a rotating shaft for fixing a bearing to the rotating shaft, the step of attaching a retaining ring to a groove provided in the rotating shaft, and the rotating shaft A step of inserting the bearing; a step of inserting a fixing member having elasticity into the rotating shaft from the opposite side of the retaining ring to the bearing; and pressing the bearing against the retaining ring by the fixing member. Fixing the bearing to the rotating shaft by fixing a fixing member to the rotating shaft.

  In the bearing fixing method to the rotating shaft according to the present invention, the fixing member is a push nut, and the push nut is fixed to the rotating shaft while pressing the bearing against the retaining ring through a washer. .

  The rotating shaft assembly of the present invention is a rotating shaft assembly in which a bearing is fixed to the rotating shaft, and is attached to a groove portion provided in the rotating shaft, and a retaining ring that contacts the bearing from one side in the axial direction. And a fixing member fixed to the rotating shaft while pressing the bearing against the retaining ring and elastically contacting the bearing from the other side in the axial direction.

  In the rotating shaft assembly of the present invention, the fixing member is a push nut, and the push nut is fixed to the rotating shaft while pressing the bearing against the retaining ring via a washer.

  An electric motor with a speed reduction mechanism according to the present invention includes a motor main body having a rotation shaft, a worm provided on the rotation shaft, and a worm wheel meshing with the worm, and the rotation of the rotation shaft is reduced and output from an output shaft. An electric motor with a speed reduction mechanism including a speed reduction mechanism, which is fixed to a yoke of the motor main body, is fixed to a gear case that houses the speed reduction mechanism, and an insertion hole provided in the gear case, and is capable of rotating the rotating shaft A bearing that is supported by the rotating shaft, a retaining ring that is mounted in a groove provided in the rotating shaft, and that is in contact with the bearing from one axial side, and is fixed to the rotating shaft while pressing the bearing against the retaining ring, And a fixing member that elastically contacts from the other side in the axial direction.

  The electric motor with a speed reduction mechanism according to the present invention rotatably supports the portion of the rotating shaft closer to the yoke than the worm by the bearing, and disposes the retaining ring on the worm side of the bearing and The fixing member is arranged on the yoke side.

  In the electric motor with a speed reduction mechanism according to the present invention, the fixing member is a push nut, and the push nut is fixed to the rotating shaft while pressing the bearing against the retaining ring via a washer.

  The electric motor with a speed reduction mechanism of the present invention is characterized in that the opening end portion of the insertion hole of the gear case is pressed from the axial direction by a punch tool.

  According to the present invention, since the bearing can be sandwiched between the retaining ring and the elastic fixing member and securely fixed to the rotating shaft, the axial direction of the rotating shaft relative to the support body such as a gear case to which the bearing is fixed Can be prevented, and noise and vibration of an electric motor with a speed reduction mechanism provided with this rotating shaft can be prevented.

  According to the present invention, since the push nut is used as the fixing member, the fixing operation of the bearing can be facilitated. In addition, since the washer is sandwiched between the push nut and the bearing, it becomes possible to fix the bearing having a small diameter with the push nut.

  According to the present invention, since the opening end portion of the insertion hole of the gear case is pressed from the axial direction by the punch tool, the bearing can be securely and securely fixed to the insertion hole. Therefore, it is possible to prevent the bearing from moving in the axial direction inside the insertion hole together with the rotating shaft, and reliably prevent abnormal noise and vibration of the electric motor with a speed reduction mechanism provided with the rotating shaft.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a perspective view showing a wiper motor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an internal structure of the wiper motor shown in FIG. 1, and FIG. 3 shows an inner surface of the cover shown in FIG. FIG.

  A wiper motor 11 shown in FIG. 1 is used as a drive source of a vehicle wiper device (not shown), and is an electric motor with a speed reduction mechanism including a motor body 12 and a speed reducer 13.

  The motor body 12 is a so-called brushed direct current motor, and includes a yoke 14 formed of a steel plate in a cylindrical shape with a bottom and an armature 15 accommodated in the yoke 14 as shown in FIG. The amateur 15 includes an armature shaft 16 as a rotation shaft, and the armature shaft 16 is rotatably supported on the yoke 14 by a metal bearing 17. As a result, the armature 15 is rotatable inside the yoke 14.

  A pair of magnets 18a and 18b are fixed to the inner surface of the yoke 14 with different magnetic poles facing each other, and a magnetic field is formed inside the yoke 14 by these magnets 18a and 18b. An armature core 21 is fixed to the armature shaft 16 so as to be positioned inside the magnets 18a and 18b, and a plurality of armature coils 22 are wound around the armature core 21. A commutator 23 is fixed to the armature shaft 16 adjacent to the armature core 21 on the speed reducer 13 side, and the coil ends of the armature coils 22 are electrically connected to the commutator 23, respectively.

  In order to supply a driving current to the amateur coil 22, the motor body 12 is provided with a pair of brushes 24a and 24b. These brushes 24a and 24b are respectively supported by a brush holder 25 and biased by springs 26a and 26b, and are in sliding contact with the outer peripheral surface of the commutator 23 from the radially outer side. Then, by supplying a drive current to each brush 24a, 24b, the drive current commutated at a predetermined timing via the commutator 23 is supplied to each armature coil 22, and the armature shaft 16 rotates. ing.

  In the present embodiment, a DC motor with a brush is used as the motor body 12. However, the present invention is not limited to this, and another type of motor body 12 such as a brushless DC motor may be used.

  On the other hand, the speed reducer 13 includes a gear case 31 fixed to the open end of the yoke 14 by fastening members (bolts) 27a and 27b. The gear case 31 includes a bottom case 32 formed in a bathtub shape by aluminum die casting and a resin cover 33, and the gear case 31 is configured by closing the bottom case 32 with the cover 33. ing.

  The bottom case 32 is provided with a bottomed cylindrical boss portion 35 integrally with a flange portion 34 which is a fixed portion to the yoke 14. A cylindrical support portion 36 that protrudes toward the inside of the gear case 31 is integrally formed at the shaft center of the boss portion 35, and the inside of the support portion 36 is inserted into the yoke 14 and the gear case 31. It is a hole 37. The amateur shaft 16 is inserted into the insertion hole 37 from the yoke 14 side, and the tip end side projects into the gear case 31.

  A ball bearing 41 as a bearing is mounted in the insertion hole 37, and an intermediate portion of the armature shaft 16 is rotatably supported by the gear case 31 by the ball bearing 41. Further, the distal end portion of the armature shaft 16 is rotatably supported by a metal bearing 42 fixed to the gear case 31.

  In order to decelerate the rotation of the amateur shaft 16 and output it from the output shaft 43, a reduction mechanism 44 is accommodated in the gear case 31. The speed reduction mechanism 44 is a so-called worm gear mechanism, and is fixed to a worm 45 and an output shaft 43 that are integrally formed on an outer peripheral surface of a portion of the armature shaft 16 that is accommodated in the gear case 31, and is rotatable inside the gear case 31. And a worm wheel 46 to be accommodated. The worm 45 is meshed with the worm wheel 46, and when the motor body 12 operates and the armature shaft 16 rotates, the rotation is decelerated to a predetermined rotational speed via the worm 45 and the worm wheel 46, and the output shaft 43 is output.

  As shown in FIG. 3, a control board 47 for controlling the operation of the motor body 12 is attached to the back surface of the cover 33. The control board 47 has a function as a so-called microcomputer in which a plurality of electronic components such as a CPU, a memory, and an FET are mounted on the board. When the cover 33 is fixed to the bottom case 32, power is supplied to the control board 47. Terminals 48a and 48b are electrically connected to the brushes 24a and 24b. The control board 47 is connected to a wiper switch or a battery (power source) (not shown) via a connector 51 provided on the cover 33, and supplies a direct current to the motor body 12 in response to a command signal from the wiper switch. Operation control is performed.

  In order to detect the rotation of the amateur shaft 16, a pair of hall sensors 52 a and 52 b are provided on the control board 47, and the sensor magnet 53 is fixed to the armature shaft 16 adjacent to the yoke 14 side with respect to the worm 45. Has been. The sensor magnet 53 is a ring-shaped multipolar magnetized magnet in which a plurality of magnetic poles are alternately magnetized in the circumferential direction, and each Hall sensor 52a, 52b faces the sensor magnet 53 with a predetermined phase difference. It is supposed to be. As a result, when the armature shaft 16 rotates, a pulse signal with a period inversely proportional to the number of rotations is output from each Hall sensor 52a, 52b, and the control board 47 detects the number of rotations of the armature shaft 16 from the period of these pulse signals. Can be done. The control board 47 can detect the rotation direction of the armature shaft 16 based on the order of appearance of the pulse signals from the hall sensors 52a and 52b. These detection signals are used for controlling the operation of the motor main body 12 by the control board 47.

  As described above, the intermediate portion of the armature shaft 16, that is, the portion of the armature shaft 16 closer to the yoke 14 than the worm 45 is rotatably supported by the ball bearing 41 mounted in the insertion hole 37 of the gear case 31. In the wiper motor 11, the ball bearing 41 is fixed to the armature shaft 16 and is fixed to the insertion hole 37 of the gear case 31, thereby restricting the movement of the armature shaft 16 in the axial direction inside the yoke 14 and the gear case 31. I have to.

  4 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 5 is an exploded perspective view showing a state before the ball bearing shown in FIG. 4 is fixed to the armature shaft.

  As shown in FIG. 4, the ball bearing 41 fixed to the armature shaft 16 has a structure in which balls (rolling elements) 41c are arranged between an inner race (inner ring) 41a and an outer race (outer ring) 41b. The inner race 41a is sandwiched between a retaining ring (snap ring) 54 and a pipe member 55 as a fixing member, so that the yoke 14 is located more than the intermediate portion between the worm 45 and the commutator 23 of the armature shaft 16, that is, the worm 45. It is fixed in an axially positioned state at an intermediate portion on the side of the side.

  As shown in FIG. 5, the retaining ring 54 is a C-shaped retaining ring provided with a notch in a part in the circumferential direction, and is attached to a groove portion 56 provided in the armature shaft 16 and fixed to the armature shaft 16. It has come to be. The groove portion 56 is provided in a portion adjacent to the worm 45 side with respect to the ball bearing 41 on the outer peripheral surface of the armature shaft 16, and as a result, as shown in FIG. The ball bearing 41 is positioned on the worm 45 side which is one side in the axial direction with respect to the inner race 41a, and comes into contact with the inner race 41a from the side of the worm 45 in the axial direction.

  The retaining ring 54 is not limited to the C-shaped retaining ring, but may be an E-shaped retaining ring or a clip retaining ring that is attached to the groove portion 56 of the armature shaft 16 and can regulate the movement of the ball bearing 41 in the axial direction. For example, a retaining ring 54 having another shape may be used.

  The pipe material 55 is made of metal such as steel, and is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the armature shaft 16 as shown in FIG. On the other hand, the outer peripheral surface of the portion adjacent to the yoke 14 side (commutator 23 side) with respect to the ball bearing 41 of the armature shaft 16 is knurled to provide a knurled portion 57 as an uneven portion. The pipe material 55 is caulked by the knurled portion 57 and fixed to the armature shaft 16. As a result, as shown in FIG. 4, the pipe material 55 is located on the side of the yoke 14 that is the other side in the axial direction with respect to the inner race 41a of the ball bearing 41, and the inner race 41a has the yoke 14 in the axial direction. Abutting from the side. With such a structure, the inner race 41a of the ball bearing 41 is sandwiched between the retaining ring 54 and the pipe material 55 and is fixed to the armature shaft 16 in a state where movement in the axial direction is restricted. .

  On the other hand, as shown in FIG. 4, the ball bearing 41 is fixed to the insertion hole 37, that is, the inner peripheral surface of the support portion 36 by press-fitting the outer race 41 b into the insertion hole 37. 6 is a cross-sectional view showing the arrow A in FIG. 4. As shown in this figure, the axial end portions of the support portion 36 serving as the opening end portions of the insertion holes 37 are equally spaced in the circumferential direction. The six processed portions 58 are pressed from the axial direction by punching tools (not shown), so that the end portions are slightly plastically deformed to the inner peripheral side, and the ball bearing 41 is securely inserted into the insertion hole 37. It is supposed to be fixed to.

  As described above, in the wiper motor 11, the ball bearing 41 is fixed to the armature shaft 16 and is fixed to the insertion hole 37 of the gear case 31, so that the armature shaft 16 moves in the axial direction by the reaction force from the speed reduction mechanism 44. This can prevent the noise and vibration of the wiper motor 11.

  FIG. 7 is a perspective view showing details of an amateur shaft assembly, and FIG. 8 is a process diagram of a ball bearing fixing method to an amateur shaft according to an embodiment of the present invention. ) Is an explanatory view showing a procedure for fixing the ball bearing to the amateur shaft.

  In the wiper motor 11, in order to easily fix the ball bearing 41 to the armature shaft 16, the ball bearing 41 is preliminarily attached to the armature shaft 16 using a retaining ring 54 and a pipe material 55 as shown in FIG. 7. An amateur shaft assembly 61 as a fixed rotating shaft assembly is assembled, and an amateur core 21 and a commutator 23 are assembled to the armature assembly 61 to constitute the amateur 15. In reverse, the armature core 21, the commutator 23, etc. are assembled first, and then the ball bearing 41 is fixed to the armature shaft 16 in advance using the retaining ring 54 and the pipe material 55, so that the armature as a rotating shaft assembly is obtained. It is also possible to assemble the shaft assembly 61.

  Next, a procedure for fixing the ball bearing 41 to the armature shaft 16 by the ball bearing fixing method to the armature shaft, that is, an assembly procedure of the armature shaft assembly 61 will be described as a method of fixing the bearing to the rotating shaft of the present invention.

  First, as shown in step S1 in FIG. 8, a retaining ring attaching step is performed, and as shown in FIG. 9A, the retaining ring 54 is attached to the groove portion 56 provided in the armature shaft 16. Next, a bearing insertion process is performed as shown in step S2, and the ball bearing 41 is inserted or press-fitted into the armature shaft 16 as shown in FIG. 9B. At this time, the ball bearing 41 is inserted into the armature shaft 16 from the side opposite to the worm 45 with respect to the retaining ring 54. Next, a pipe material insertion process is performed as shown in step S3, and the pipe material 55 is inserted into the armature shaft 16 as shown in FIG. 9C. At this time, the pipe material 55 is inserted into the armature shaft 16 from the same side as the ball bearing 41, that is, from the side opposite to the retaining ring 54 with respect to the ball bearing 41. When the pipe material 55 is inserted through the amateur shaft 16, a pipe material caulking process is performed as shown in step S4, and the pipe material 55 is fixed to the knurled portion of the amateur shaft 16 by caulking. At this time, as shown in FIG. 9C, a pressing force is applied to the pipe material 55 in the axial direction so as to press the inner race 41 a of the ball bearing 41 against the retaining ring 54. The inner race 41a is fixed to the amateur shaft 16 by caulking while pressing the inner race 41a against the retaining ring 54. As a result, the inner race 41a of the ball bearing 41 is sandwiched between the retaining ring 54 and the pipe material 55 in the axial direction without looseness, and the ball bearing 41 can be securely fixed to the armature shaft 16.

  In this embodiment, not only the retaining ring 54 is installed on the worm 45 side, but also the retaining ring 54 is formed on the commutator 23 side and the pipe material 55 on the opposite side across the ball bearing 41, and assembled in the same procedure. It is also possible to do this.

  Thus, according to the present invention, the ball bearing 41 is pressed against the retaining ring 54 by the pipe member 55 and the pipe member 55 is fixed to the armature shaft 16 by caulking. It can be sandwiched between the pipe material 55 and securely fixed to the armature shaft 16 without any play in the axial direction. Thereby, the movement of the armature shaft 16 in the axial direction with respect to the gear case 31 and the yoke 14 to which the ball bearing 41 is fixed can be restricted, and the noise and vibration of the wiper motor 11 provided with the armature shaft 16 can be prevented. . Further, since a member such as a damper for preventing the ball bearing 41 from rattling in the axial direction is unnecessary, the configuration of the wiper motor 11 can be simplified and the cost thereof can be reduced.

  In addition, according to the present invention, the knurled portion 57 is formed on the outer peripheral surface of the portion of the armature 16 where the pipe material 55 is caulked, so that the caulked pipe material 55 is bitten into the knurled portion 57. The pipe material 55 can be reliably fixed to the amateur shaft 16.

  Furthermore, according to the present invention, since the pipe material 55 is made of metal, the pipe material 55 can be securely fixed to the armature shaft 16 by caulking. Thereby, it is possible to reliably prevent the armature shaft 16 from moving in the axial direction, and to reliably prevent abnormal noise and vibration of the wiper motor 11 provided with the armature shaft 16.

  Furthermore, according to the present invention, the opening end portion of the insertion hole 37 of the gear case 31 is pressed from the axial direction by the punch tool, so that the ball bearing 41 is inserted into the insertion hole by plastically deforming the opening end portion by the processing. 37 can be securely fixed. Thus, the ball bearing 41 together with the armature shaft 16 is prevented from moving in the axial direction inside the insertion hole 37, and the noise and vibration of the wiper motor 11 provided with the armature shaft 16 can be reliably prevented. .

  10 is a cross-sectional view showing another embodiment of the present invention, and FIG. 11 is a perspective view showing details of the push nut shown in FIG. In FIGS. 10 and 11, members corresponding to those described above are denoted by the same reference numerals.

  In the embodiment shown in FIG. 4, the ball bearing 41 is sandwiched between the retaining ring 54 and the pipe material 55 and fixed to the armature shaft 16. On the other hand, in the embodiment shown in FIG. 10, a push nut 71 is used as an elastic fixing member, and the push nut 71 is elastically brought into contact with the ball bearing 41 via the washer 72, thereby The bearing 41 is sandwiched between the retaining ring 54 and the push nut 71 so as to be fixed to the amateur shaft 16.

  As shown in FIG. 11, the push nut 71 is formed of a spring material as an elastic body such as a steel plate, for example, and is radially inclined in a state of being slightly inclined in the axial direction from the inner periphery of the annular flange portion 71a and the flange portion 71a. And a plurality of claw portions 71b projecting from each other. The shaft center of the flange portion 71a is a mounting hole, and the push nut 71 is inserted through the armature shaft 16 in this mounting hole. When the push nut 71 is inserted through the armature shaft 16, each claw portion 71b is pushed by the outer surface of the armature shaft 16 and is expanded while being elastically deformed. When the flange portion 71a reaches a predetermined position, each claw portion 71b bites into the outer peripheral surface of the armature shaft 16, and the push nut 71 is fixed to the armature shaft 16. In the present embodiment, the inner diameter of the push nut 71, that is, the inner diameter of each claw portion 71 b is set to be smaller than the outer diameter of the armature shaft 16 and slightly larger than the outer diameter of the worm 45. The push nut 71 can be passed through the armature shaft 16 without damaging the worm 45 provided on the shaft 16.

  A washer 72 is mounted between the ball bearing 41 and the push nut 71. The washer 72 has an outer diameter set smaller than the inner diameter of the outer race 41b of the ball bearing 41 and larger than the outer diameter of the inner race 41a. The inner diameter is slightly larger than the outer diameter of the armature shaft 16 and the ball bearing. 41 is set to be smaller than the outer diameter of the inner race 41a. As a result, the ball bearing 41 can be fixed (supported) by the push nut 71 whose inner diameter dimension of the flange portion 71 a is larger than the outer diameter dimension of the inner race 41 a of the ball bearing 41.

  As in the case of the pipe material 55, in the push nut 71, the retaining ring 54 is attached to the groove portion 56 of the armature shaft 16, and then the ball bearing 41 is inserted into the armature shaft 16, and then the washer from the side opposite to the retaining ring 54. After 72 is inserted, the armature shaft 16 is inserted. The push nut 71 is fixed to the amateur shaft 16 while pressing the ball bearing 41 against the retaining ring 54 via the washer 72. As described above, by using the push nut 71 as the fixing member, the fixing operation of the ball bearing 41 to the armature shaft 16 can be facilitated.

  It goes without saying that 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, in the above-described embodiment, the present invention is applied to the armature shaft assembly 61 used in the wiper motor 11. However, the present invention is not limited to this. For example, the armature shaft of a power window motor may be used for other purposes. You may make it apply this invention to the rotating shaft used.

  Moreover, in the said embodiment, although the uneven | corrugated processed part is made into the knurled part 57 formed by knurling, it is not restricted to this, For example, V-groove processing, U-groove processing, etc. may be sufficient.

  Further, in the above-described embodiment, the pipe material 55 is made of metal. However, the present invention is not limited to this, and the pipe material 55 is made of another material as long as it can be plastically deformed by caulking and fixed to the armature shaft 16. The pipe material 55 may be used.

  Furthermore, the fixing member is not limited to the pipe material 55 and the push nut 71, and may be another member as long as it is a member fixed to the armature shaft 16.

It is a perspective view which shows the wiper motor which is one embodiment of this invention. It is sectional drawing which shows the internal structure of the wiper motor shown in FIG. It is a figure which shows the inner surface of the cover shown in FIG. It is sectional drawing which follows the AA line in FIG. It is a disassembled perspective view which shows the state before fixing to the amateur shaft of the ball bearing shown in FIG. It is sectional drawing which shows the arrow A in FIG. It is a perspective view which shows the detail of an amateur shaft assembly. It is process drawing of the ball bearing fixing method to the amateur shaft which is one embodiment of this invention. (A)-(c) is explanatory drawing which shows the fixation procedure of the ball bearing to an amateur shaft, respectively. It is sectional drawing which shows other embodiment of this invention. It is a perspective view which shows the detail of the push nut shown in FIG.

Explanation of symbols

11 Wiper motor (electric motor with reduction mechanism)
12 Motor body 13 Reducer 14 Yoke 15 Amateur 16 Amateur shaft (rotating shaft)
17 Metal bearings 18a, 18b Magnet 21 Amateur core 22 Amateur coil 23 Commutators 24a, 24b Brush 25 Brush holder 26a, 26b Spring 27a, 27b Fastening member 31 Gear case 32 Bottom case 33 Cover 34 Flange portion 35 Boss portion 36 Support portion 37 Insertion hole 41 Ball bearing
41a Inner race 41b Outer race 41c Ball 42 Metal bearing 43 Output shaft 44 Deceleration mechanism 45 Worm 46 Worm wheel 47 Control board 48a, 48b Feed terminal 51 Connector 52a, 52b Hall sensor 53 Sensor magnet 54 Retaining ring 55 Pipe material (fixing member)
56 Groove part 57 Knurled part (concave / convex part)
58 Machining part 61 Amateur shaft assembly (Rotating shaft assembly)
71 Push nut (fixing member)
71a Flange 71b Claw 72 Washer

Claims (8)

A method of fixing a bearing to a rotating shaft, wherein the bearing is fixed to the rotating shaft,
Attaching a retaining ring to a groove provided in the rotating shaft;
Inserting the bearing through the rotating shaft;
Inserting a fixing member having elasticity into the rotary shaft from the opposite side of the retaining ring with respect to the bearing;
Fixing the bearing to the rotating shaft by fixing the fixing member to the rotating shaft while pressing the bearing against the retaining ring by the fixing member. .   The bearing fixing method to the rotating shaft according to claim 1, wherein the fixing member is a push nut, and the push nut is fixed to the rotating shaft while pressing the bearing against the retaining ring via a washer. The bearing fixing method to the rotating shaft. A rotating shaft assembly having a bearing fixed to the rotating shaft,
A retaining ring that is mounted in a groove provided on the rotating shaft and contacts the bearing from one side in the axial direction;
A rotating shaft assembly comprising: a fixing member fixed to the rotating shaft while pressing the bearing against the retaining ring and elastically contacting the bearing from the other side in the axial direction.   4. The rotating shaft assembly according to claim 3, wherein the fixing member is a push nut, and the push nut is fixed to the rotating shaft while pressing the bearing against the retaining ring through a washer. Shaft assembly. An electric motor with a speed reduction mechanism, comprising: a motor body having a rotation shaft; a worm provided on the rotation shaft; and a worm wheel meshing with the worm; A motor,
A gear case fixed to the yoke of the motor body and containing the speed reduction mechanism;
A bearing fixed to an insertion hole provided in the gear case, and rotatably supporting the rotating shaft;
A retaining ring that is mounted in a groove provided on the rotating shaft and contacts the bearing from one side in the axial direction;
An electric motor with a speed reduction mechanism, comprising: a fixing member fixed to the rotating shaft while pressing the bearing against the retaining ring and elastically contacting the bearing from the other side in the axial direction.   6. The electric motor with a speed reduction mechanism according to claim 5, wherein a portion of the rotating shaft that is closer to the yoke than the worm is rotatably supported by the bearing, and the retaining ring is disposed on the worm side of the bearing. An electric motor with a speed reduction mechanism, wherein the fixing member is disposed on the yoke side of the bearing.   The electric motor with a speed reduction mechanism according to claim 5 or 6, wherein the fixing member is a push nut, and the push nut is fixed to the rotating shaft while pressing the bearing against the retaining ring via a washer. An electric motor with a reduction mechanism.   The electric motor with a speed reduction mechanism according to any one of claims 5 to 7, wherein an opening end portion of the insertion hole of the gear case is pressed from the axial direction by a punching tool. .

Images