JP2009207297A - Bearing fixing method to rotation axis, rotation axis assembly and electric motor with reduction gear mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate movement of a rotation axis to an axial direction and to prevent abnormal noise and vibration of an electric motor with reduction gear mechanism, where the rotation axis is arranged, by securely fixing a bearing to the rotation axis. <P>SOLUTION: An armature axis 16 of a motor main body is inserted into an insertion hole 37 formed in a gear case 31. An intermediate part of the armature axis 16 is freely rotatably supported by a ball bearing 41 fixed to the insertion hole 37. A first retaining ring 54 is installed in a first groove part 56 disposed in the armature axis 16. A second retaining ring 55 is arranged in a second groove part 57 formed on a side opposite to the first groove part 56 across the ball bearing 41. The second retaining ring 55 is depressed to the ball bearing 41 by a plastic deformation part 59 obtained by plastic-deforming a part to be worked, which is arranged in the armature axis 16. The ball bearing 41 is inserted between the first and second retaining rings 54 and 55 so as to fix it to the armature axis 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 has 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 body, and the rotation shaft (amateur shaft) of the motor body projects into the gear case through an insertion hole provided in the gear case. The worm constituting the speed reduction mechanism 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 discloses 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, the rotating shaft may move in the axial direction due to the reaction force between the worm and the worm wheel, which may cause 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.

  The bearing fixing method to the rotating shaft of the present invention is a bearing fixing method to the rotating shaft for fixing the bearing to the rotating shaft, and the step of mounting the first retaining ring in the first groove portion provided in the rotating shaft. And a step of inserting the bearing through the rotating shaft, and a step of attaching a second retaining ring to a second groove portion provided on the opposite side of the first groove portion across the bearing between the rotating shaft and The part to be processed adjacent to the outside in the axial direction of one of the first and second grooves of the rotating shaft is plastically deformed toward the bearing, and the first or second is deformed by the plastic deforming part. And a step of pressing two retaining rings against the bearing.

  In the bearing fixing method to the rotating shaft according to the present invention, the rotating shaft is provided with a processing groove on the rotating shaft so as to be arranged at a predetermined interval on the outer side in the axial direction with respect to one of the first and second groove portions. The processed portion is formed to project annularly between either the first or second groove portion and the processing groove.

  In the method of fixing the bearing to the rotating shaft according to the present invention, the workpiece is adjacent to the outer side in the axial direction of one of the first and second groove portions and radially outward from the outer peripheral surface of the rotating shaft. It is formed to project in an annular shape.

  The bearing fixing method to the rotating shaft of the present invention is characterized in that a plurality of plastically deformed portions arranged at equal intervals in the circumferential direction are formed.

  In the method of fixing a bearing to the rotating shaft according to the present invention, an annular plastic deformation portion is formed over the entire circumference of the rotating shaft by rotating the rotating shaft while pressing a jig against the workpiece. It is characterized by.

  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 mounted in a first groove portion provided on the rotating shaft, and is disposed on one side in the axial direction of the bearing. A first retaining ring and a second groove portion provided on the opposite side of the first groove portion with the bearing sandwiched between the rotation shaft and a first retaining ring disposed on the other axial side of the bearing. And a work piece adjacent to the outside in the axial direction of one of the first and second groove portions of the rotating shaft and plastically deformed toward the bearing, It has a plastic deformation part which presses the 1st or 2nd retaining ring against the bearing.

  In the rotating shaft assembly of the present invention, the rotating shaft is provided with a processing groove on the rotating shaft so as to be arranged at a predetermined interval on the outer side in the axial direction with respect to one of the first and second groove portions. The processing portion is formed to project annularly between either the first or second groove portion and the processing groove.

  In the rotating shaft assembly according to the present invention, the processed portion is adjacent to the outer side in the axial direction of one of the first and second groove portions, and protrudes in an annular shape radially outward from the outer peripheral surface of the rotating shaft. It is characterized by being formed.

  The rotating shaft assembly of the present invention includes a plurality of plastically deformable portions arranged at equal intervals in the circumferential direction.

  The rotating shaft assembly according to the present invention is characterized in that the plastic deformation portion is formed in an annular shape over the entire circumference of the rotating shaft.

  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 comprising a speed reduction mechanism, wherein the electric motor is fixed to a yoke of the motor main body, accommodates the speed reduction mechanism, and is fixed to an insertion hole provided in the gear case. A bearing that is rotatably supported, a first retaining ring that is mounted in a first groove portion provided on the rotating shaft and is disposed on one side in the axial direction of the bearing, and the bearing is sandwiched between the rotating shaft A second retaining ring mounted on a second groove provided on the opposite side of the first groove and disposed on the other axial side of the bearing; and the first or second of the rotating shaft. Any one of the grooves And a plastic deformation portion that is formed by plastic deformation of a work portion adjacent to the outside in the axial direction toward the bearing, and presses the first or second retaining ring against the bearing. To do.

  In the electric motor with a speed reduction mechanism according to the present invention, the rotating shaft is provided with a processing groove on the outer side in the axial direction with respect to either the first or the second groove portion with a predetermined interval. The part to be processed is formed to project annularly between either the first or second groove part and the processing groove.

  In the electric motor with a speed reduction mechanism according to the present invention, the processed portion is adjacent to the outer side in the axial direction of one of the first or second groove portions and is annularly formed radially outward from the outer peripheral surface of the rotating shaft. It is formed to protrude.

  The electric motor with a speed reduction mechanism according to the present invention includes a plurality of plastic deformation portions arranged at equal intervals in the circumferential direction.

  The electric motor with a speed reduction mechanism according to the present invention is characterized in that the plastic deformation portion is formed in an annular shape over the entire circumference of the rotating shaft.

  According to the present invention, since one of the first and second retaining rings mounted on the rotating shaft across the bearing is pressed against the bearing by the plastic deformation portion, the bearing is connected to the first retaining ring and the first retaining ring. 2 and can be securely fixed to the rotating shaft. As a result, the movement of the rotating shaft in the axial direction relative to the support body such as a gear case to which the bearing is fixed can be restricted, and abnormal noise and vibration of the electric motor with a speed reduction mechanism provided with the rotating shaft can be prevented. it can.

  Moreover, according to the present invention, the processing groove is provided by arranging the processed portion side by side with a predetermined interval on the outer side in the axial direction with respect to either the first or second groove portion of the rotating shaft and the groove portion. Since it is formed in a shape protruding annularly between the two, the plastic deformation portion can be easily processed.

  Further, according to the present invention, the workpiece is adjacent to the outer side in the axial direction of one of the first and second grooves on the rotating shaft and protrudes annularly radially outward from the outer peripheral surface of the rotating shaft. Since it is formed into a shape, the plastic deformation portion can be easily processed.

  Furthermore, according to the present invention, since a plurality of plastic deformation portions arranged at equal intervals in the circumferential direction are formed, the first or second retaining ring is pressed against the bearing with an equal pressing force in the circumferential direction, The bearing can be securely fixed to the rotating shaft by the retaining ring.

  Furthermore, according to the present invention, since the annular plastic deformation portion is formed over the entire circumference of the rotating shaft, the first or second retaining ring is pressed against the bearing with an equal pressing force in the circumferential direction, The bearing can be securely fixed to the rotating shaft by the retaining ring. In addition, since the annular plastic deformation portion is formed by rotating the rotation shaft in a state where the jig is pressed against the processing portion, the plastic deformation portion can be easily processed.

  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 located 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. When a drive current is supplied to each brush 24a, 24b, the drive current commutated at a predetermined timing via the commutator 23 is supplied to each armature coil 22, so that the armature shaft 16 rotates.

  In the present embodiment, a brushed DC motor is used as the motor body 12, but 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 opening 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. It has become.

  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 communicates with the inside of the yoke 14 and the inside of the gear case 31. It becomes the insertion hole 37 to do. The amateur shaft 16 is inserted into the insertion hole 37 from the side of the yoke 14, 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 the outer peripheral surface of a portion of the armature shaft 16 that is accommodated in the gear case 31. And a worm wheel 46 that is rotatably 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 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. Like to do.

  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 first retaining ring (snap ring) 54 and a second retaining ring (snap ring) 55 that are respectively attached to the armature shaft 16, so that the worm 45 of the armature shaft 16 and The intermediate portion between the commutators 23, that is, the intermediate portion closer to the yoke 14 than the worm 45 is fixed in the axially positioned state.

  As shown in FIG. 5, the first retaining ring 54 is a C-shaped retaining ring having a notch in a part in the circumferential direction, and is attached to a first groove portion 56 provided on the armature shaft 16. Yes. The first groove portion 56 is provided at 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, so that the first groove portion 56 is attached to the first groove portion 56 as shown in FIG. 4. The first retaining ring 54 is disposed on the worm 45 side which is one side in the axial direction with respect to the ball bearing 41 and comes into contact with the inner race 41a of the ball bearing 41 from one side in the axial direction. Yes. Further, the groove width of the first groove portion 56 is slightly wider than the thickness of the first retaining ring 54 due to dimensional tolerances, etc., whereby the first retaining ring attached to the first groove portion 56. 54 is movable in the axial direction within the range of the groove width of the first groove portion 56.

  Similarly, the second retaining ring 55 is a C-shaped retaining ring having a notch in a part in the circumferential direction, and is attached to a second groove portion 57 provided on the armature shaft 16. The second groove portion 57 is provided on a portion adjacent to the commutator 23 side with respect to the ball bearing 41 on the outer peripheral surface of the armature shaft 16, that is, on the opposite side of the first groove portion 56 with the ball bearing 41 interposed therebetween. As a result, as shown in FIG. 4, the second retaining ring 55 mounted in the second groove portion 57 is disposed on the side of the commutator 23, which is the other side in the axial direction with respect to the ball bearing 41. The inner race 41a is in contact with the other side in the axial direction. Further, the groove width of the second groove portion 57 is slightly wider than the thickness of the second retaining ring 55 due to dimensional tolerances, etc., whereby the second retaining ring attached to the second groove portion 57. 55 is movable in the axial direction within the range of the groove width of the second groove portion 57.

  As shown in FIG. 4, the portion between the first groove portion 56 and the second groove portion 57 provided on the armature shaft 16 is slightly larger than the thickness (the width in the axial direction) of the ball bearing 41 fixed thereto. It is narrower. On the other hand, the groove width of the first groove portion 56 and the second groove portion 57 is such that the first retaining ring 54 and the second retaining ring 55 move in the axial direction within the range of the groove width and are most separated from each other. Sometimes, the interval between the retaining rings 54 and 55 is set to be larger than the thickness of the ball bearing 41.

  The amateur shaft 16 is provided with an annular processing groove 58 arranged at a predetermined interval on the outer side in the axial direction, that is, on the commutator 23 side with respect to the second groove portion 57. Between the two groove portions 57, there is formed a plastic deformation portion 59 that protrudes radially outward and has an annular shape over the entire circumference of the armature shaft 16. That is, the plastic deformation portion 59 is provided on the opposite side of the ball bearing 41 with respect to the portion adjacent to the outer side in the axial direction with respect to the second groove portion 57 of the armature shaft 16, that is, the second retaining ring 55. .

  The plastic deformation portion 59 is formed by plastic deformation by pressing a workpiece to be described later toward the ball bearing 41 with a jig. That is, the second retaining ring 55 is formed by the plastic deformation portion 59 with a ball. It is pressed against the inner race 41 a of the bearing 41. As a result, the ball bearing 41 is fixed to the armature shaft 16 with the inner race 41a being sandwiched between the first retaining ring 54 and the second retaining ring 55 and the movement in the axial direction being 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 processing parts 60 arranged side by side are pushed from the axial direction by a punch tool (not shown), whereby the end part is 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 sandwiched between the first and second retaining rings 54 and 55 attached to the armature shaft 16 and the second retaining ring 55 is pressed against the ball bearing 41 by the plastic deformation portion 59. The ball bearing 41 is fixed to the armature shaft 16 in a state in which the movement in the axial direction is restricted, and the ball bearing 41 is fixed to the insertion hole 37 of the gear case 31. For example, the armature shaft 16 can be prevented from moving in the axial direction, and noise and vibration of the wiper motor 11 can be prevented.

  FIG. 7 is a perspective view showing details of an amateur shaft assembly according to an embodiment of the present invention, 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. 9 (a) to 9 (f) are explanatory views 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 fixed to the armature shaft 16 in advance using the first and second retaining rings 54 and 55, An amateur shaft assembly 61 as a rotating shaft assembly shown in FIG. 7 is assembled, and the amateur core 21 and the commutator 23 are assembled thereto to constitute the amateur 15.

  The reverse procedure, that is, the armature core 21, the commutator 23, etc. are assembled to the armature shaft 16 first, and then the ball bearing 41 is fixed to the armature shaft 16 using the first and second retaining rings 54, 55. It is also possible to assemble the armature shaft assembly 61 as a rotating shaft assembly.

  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 as step S1 in FIG. 8, a first retaining ring mounting step is performed. As shown in FIG. 9A, in the first retaining ring mounting step, the first retaining ring 54 is mounted in the first groove portion 56 provided in the armature shaft 16.

  Next, a bearing insertion process is performed as shown in step S2. As shown in FIG. 9B, in the bearing insertion process, the ball bearing 41 is inserted or press-fitted into the armature shaft 16. 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 first retaining ring 54.

  Next, as shown in step S3, a second retaining ring mounting step is performed. As shown in FIG. 9C, in the second retaining ring mounting step, the second retaining ring 55 is mounted in the second groove portion 57 provided on the armature shaft 16. Accordingly, the ball bearing 41 is disposed between the first retaining ring 54 and the second retaining ring 55. Here, the ball bearing 41 is disposed between the first retaining ring 54 and the second retaining ring 55, and each retaining ring 54, 55 is axially within the range of the groove widths of the corresponding groove portions 56, 57. Therefore, the ball bearing 41 is not yet in a state where the movement in the axial direction is restricted by the retaining rings 54, 55, and has a slight backlash in the axial direction. .

  When the retaining rings 54 and 55 are attached to the amateur shaft 16, a retaining ring pressing process is performed as shown in step S4. As shown in FIGS. 9A to 9D, there is a diameter between the second groove portion 57 of the armature shaft 16 and the processing groove 58, that is, in the portion adjacent to the outside of the second groove portion 57 in the axial direction. A workpiece 62 having a convex shape with a rectangular cross section protruding outward in the direction and formed in an annular shape over the entire circumference of the armature shaft 16 is provided. In the retaining ring pressing step, the workpiece 62 is a jig. The plastic deformation portion 59 is formed by plastic deformation by 63 toward the ball bearing 41 side.

  That is, in the retaining ring pressing step, first, as shown in FIG. 9 (d), the jig 63 is pressed from the radial direction of the armature shaft 16 to the processing portion 62 provided on the armature shaft 16, whereby the workpiece is processed. Part of the circumferential direction of the portion 62 is plastically deformed toward the ball bearing 41 side. Next, as shown in FIG. 9 (e), the armature shaft 16 is rotated while a part of the processed part 62 is plastically deformed by the jig 63, so that the processed part 62 is moved all around. The plastic deformation is continued. When the entire circumference of the workpiece 62 is plastically deformed by the jig 63, an annular plastic deformation part 59 is formed on the armature shaft 16 over the entire circumference, as shown in FIG. 9 (f). .

  When the plastic deformation portion 59 is formed, the second retaining ring 55 is pressed against the inner race 41a of the ball bearing 41 by the plastic deformation portion 59, and the inner race 41a of the ball bearing 41 is moved to the retaining rings 54, 55. It is sandwiched without play in the axial direction. Thereby, the ball bearing 41 is fixed to the armature shaft 16 in a state in which movement in the axial direction is restricted. Further, since the plastic deformation portion 59 is formed in an annular shape over the entire circumference of the armature shaft 16, the pressing force applied from the plastic deformation portion 59 to the second retaining ring 55 is applied to the retaining ring 55 in the entire circumferential direction. The ball bearing 41 can be reliably fixed to the armature shaft 16 by the second retaining ring 55.

  The jig 63 is provided with a machining surface 63a that is inclined with respect to the axial direction of the armature shaft 16, and the workpiece 62 is plastically deformed by pressing the machining surface 63a against the workpiece 62 from the outside in the radial direction. It is supposed to let you. Further, the jig 63 is configured such that when the machining surface 63 a is pressed against the workpiece 62, the tip of the jig 63 enters the machining groove 58. It is easy to process.

  Thus, according to the present invention, the first and second retaining rings 54, 55 are mounted on the armature shaft 16 with the ball bearing 41 interposed therebetween, and the second retaining ring 55 is attached to the ball bearing 41 by the plastic deformation portion 59. Since the ball bearing 41 is sandwiched between the first retaining ring 54 and the second retaining ring 55 by being pressed against the inner race 41a, the retaining rings 54, 55 are caused by the dimensional tolerances of the grooves 56, 57. Even if it has a backlash in the axial direction with respect to the corresponding groove portions 56, 57, the ball bearing 41 is securely sandwiched by the retaining rings 54, 55 and the movement of the ball bearing 41 in the axial direction is restricted. Can be fixed to the armature shaft 16. Thereby, the movement of the armature shaft 16 in the axial direction with respect to the gear case 31 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.

  In addition, according to the present invention, the processing groove 58 is provided on the outer side in the axial direction with respect to the second groove portion 57 of the armature shaft 16 at a predetermined interval, and the processing groove 58 and the second groove portion 57 are provided. Since the plastic deformed portion 59 is formed by plastically deforming the workpiece 62 therebetween, the plastic deformable portion 59 can be easily processed by the jig 63.

  Furthermore, according to the present invention, since the plastic deformation portion 59 is formed in an annular shape over the entire circumference of the armature shaft 16, the second retaining ring 55 is pressed against the ball bearing 41 with a uniform pressing force in the circumferential direction. be able to. Thereby, the ball bearing 41 can be reliably fixed to the armature shaft 16 by the second retaining ring 55. Further, since the annular plastic deformation portion 59 is formed by rotating the armature shaft 16 in a state where the jig 63 is pressed against the processed portion 62, the plastic deformation portion 59 can be easily processed. it can.

  FIG. 10 is a sectional view showing a modification of the wiper motor shown in FIG.

  In the wiper motor 11 shown in FIG. 4, an annular processed portion 62 is provided between the second groove portion 57 and the processing groove 58, and the processed portion 62 is plastically deformed toward the ball bearing 41 by the jig 63. Thus, the plastic deformation portion 59 is formed.

  On the other hand, in the modification shown in FIG. 10, a convex portion having a rectangular cross-section projecting radially outward from the first groove portion 56 of the armature shaft 16 on the outer side in the axial direction, that is, the portion adjacent to the worm 45 side. A workpiece 62 (shown by a two-dot chain line in FIG. 10) that is shaped and formed in an annular shape over the entire circumference of the armature shaft 16 is provided, and the workpiece 62 is plastically deformed toward the ball bearing 41. Thus, the plastic deformation portion 59 is formed.

  As described above, the plastic deformation portion 59 is formed by plastically deforming the workpiece 62 that protrudes annularly radially outward from the outer peripheral surface of the armature shaft 16, so that the plastic deformation portion 59 can be easily processed. it can.

  In FIG. 10, members corresponding to the members described above are given the same reference numerals.

  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.

  In the above-described embodiment, the C-shaped retaining ring is used as the first retaining ring 54 and the second retaining ring 55. However, the present invention is not limited to this, and the amateur shaft 16 such as an E-shaped retaining ring is used. Other shapes may be used as long as they are mounted in the groove portions 56 and 57 and can restrict the movement of the ball bearing 41 in the axial direction.

  Further, in the embodiment shown in FIG. 4, the processing groove 58 and the plastic deformation portion 59 are provided on the second retaining ring 55 side, and the second retaining ring 55 is attached to the ball bearing 41 by the plastic deformation portion 59. However, the present invention is not limited to this, and the first retaining ring 54 may be pressed toward the ball bearing 41 by the plastic deformation portion 59 provided on the first retaining ring 54 side.

  Furthermore, in the above-described embodiment, the plastic deformation portion 59 is formed in an annular shape over the entire circumference of the armature shaft 16, but this is not limiting, and the plastic deformation portion 59 is equally spaced in the circumferential direction of the workpiece 62. A plurality of plastic deformation portions 59 arranged at equal intervals in the circumferential direction may be formed by plastically deforming a plurality of such locations. The plurality of plastic deformation portions 59 also press the second retaining ring 55 against the ball bearing 41 with a uniform pressing force in the circumferential direction, and the ball bearing 41 is securely fixed to the armature shaft 16 by the retaining ring 55. be able to.

  Furthermore, in the said embodiment, although the to-be-processed part 62 is formed in the shape which protrudes cyclically | annularly, not only this but the jig | tool 63 is pressed on the outer peripheral surface of the armature shaft 16, and the said outer peripheral surface is made into the shape. The plastic deformation portion 59 may be formed by plastic deformation.

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 the amateur shaft assembly which is one embodiment of this invention. It is process drawing of the ball bearing fixing method to the amateur shaft which is one embodiment of this invention. (A)-(f) is explanatory drawing which shows the fixation procedure of the ball bearing to an amateur shaft, respectively. It is sectional drawing which shows the modification of the wiper motor 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 (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 First retaining ring 55 Second retaining ring Retaining ring 56 First groove portion 57 Second groove portion 58 Processing groove 59 Plastic deformation portion 60 Processing portion 61 Amateur shaft assembly (rotary shaft assembly)
62 Worked part 63 Jig 63a Machined surface

Claims (15)

A method of fixing a bearing to a rotating shaft, wherein the bearing is fixed to the rotating shaft,
Attaching a first retaining ring to a first groove provided on the rotary shaft;
Inserting the bearing through the rotating shaft;
Attaching a second retaining ring to a second groove provided on the opposite side of the first groove with the bearing sandwiched between the rotating shaft;
A workpiece portion adjacent to the outside in the axial direction of one of the first and second groove portions of the rotation shaft is plastically deformed toward the bearing, and the first or second portion is deformed by the plastic deformation portion. A method of fixing the bearing to the rotating shaft, the method comprising pressing a retaining ring against the bearing.   2. The method of fixing a bearing to a rotating shaft according to claim 1, wherein a processing groove is arranged on the rotating shaft so as to be arranged at a predetermined interval on the outer side in the axial direction with respect to one of the first and second groove portions. A method of fixing a bearing to a rotating shaft, wherein the portion to be processed is formed to project annularly between either one of the first or second groove portions and the processing groove.   The bearing fixing method to the rotating shaft according to claim 1, wherein the workpiece is adjacent to the outer side in the axial direction of one of the first and second groove portions and radially from the outer peripheral surface of the rotating shaft. A method of fixing a bearing to a rotating shaft, wherein the bearing is formed to project outward in an annular shape.   The bearing fixing method to the rotating shaft according to any one of claims 1 to 3, wherein a plurality of plastically deformed portions arranged at equal intervals in the circumferential direction are formed.   In the bearing fixing method to the rotating shaft according to any one of claims 1 to 3, by rotating the rotating shaft in a state where a jig is pressed against the workpiece, the entire circumference of the rotating shaft is obtained. A method for fixing a bearing to a rotating shaft, characterized by forming an annular plastic deformation portion. A rotating shaft assembly having a bearing fixed to the rotating shaft,
A first retaining ring mounted on a first groove provided on the rotating shaft and disposed on one axial side of the bearing;
A second retaining ring mounted on a second groove portion provided on the opposite side of the first groove portion with the bearing sandwiched between the rotary shaft and disposed on the other axial side of the bearing;
The first or second stopper is formed by plastically deforming a workpiece portion adjacent to the outside in the axial direction of one of the first and second groove portions of the rotating shaft toward the bearing side. A rotating shaft assembly comprising: a plastic deformation portion that presses a ring against the bearing.   The rotary shaft assembly according to claim 6, wherein the rotary shaft is provided with a processing groove arranged side by side with a predetermined interval on the outer side in the axial direction with respect to either the first or second groove portion. The rotating shaft assembly is characterized in that the processed part is formed to project annularly between one of the first or second groove part and the processing groove.   The rotary shaft assembly according to claim 6, wherein the processed portion is adjacent to the outer side in the axial direction of one of the first and second groove portions and is annularly formed radially outward from the outer peripheral surface of the rotary shaft. A rotating shaft assembly characterized by being formed so as to protrude from the shaft.   The rotary shaft assembly according to any one of claims 6 to 8, further comprising a plurality of plastic deformation portions arranged at equal intervals in the circumferential direction.   The rotary shaft assembly according to any one of claims 6 to 8, wherein the plastic deformation portion is formed in an annular shape over the entire circumference of the rotary shaft. 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 housing the speed reduction mechanism;
A bearing fixed to an insertion hole provided in the gear case and rotatably supporting the rotating shaft;
A first retaining ring mounted on a first groove provided on the rotating shaft and disposed on one axial side of the bearing;
A second retaining ring mounted on a second groove portion provided on the opposite side of the first groove portion with the bearing sandwiched between the rotary shaft and disposed on the other axial side of the bearing;
The first or second stopper is formed by plastically deforming a workpiece portion adjacent to the outside in the axial direction of one of the first and second groove portions of the rotating shaft toward the bearing side. An electric motor with a speed reduction mechanism, comprising: a plastic deformation portion that presses a ring against the bearing.   12. The electric motor with a speed reduction mechanism according to claim 11, wherein a processing groove is provided on the rotating shaft so as to be arranged at a predetermined interval on the outer side in the axial direction with respect to one of the first and second groove portions. An electric motor with a speed reduction mechanism, wherein the portion to be processed is formed to project annularly between either one of the first or second groove portions and the processing groove.   12. The electric motor with a speed reduction mechanism according to claim 11, wherein the processed portion is adjacent to the outer side in the axial direction of one of the first and second groove portions and radially outward from the outer peripheral surface of the rotating shaft. An electric motor with a speed reduction mechanism, wherein the electric motor is formed to project in an annular shape.   The electric motor with a speed reduction mechanism according to any one of claims 11 to 13, comprising a plurality of plastic deformation portions arranged at equal intervals in the circumferential direction.   The electric motor with a speed reduction mechanism according to any one of claims 11 to 13, wherein the plastic deformation portion is formed in an annular shape over the entire circumference of the rotating shaft.

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