JP5602407B2 - Rotating shaft and manufacturing method thereof - Google Patents

Description

  The present invention relates to a rotating shaft that is rotatably supported by a non-rotating body via a bearing member, and a method for manufacturing the rotating shaft.

  As a rotating shaft that is rotatably supported by a non-rotating body via a bearing member, for example, a rotating shaft of a motor device can be cited. Examples of the motor device include a wiper motor used as a drive source of a wiper device mounted on a vehicle such as an automobile, and the wiper motor employs an electric motor with a speed reduction mechanism that can obtain a large output while being small. . The wiper motor includes a motor portion and a speed reduction mechanism portion, and a distal end side of an armature shaft (rotation shaft) rotatably accommodated in the motor portion extends to the inside of the speed reduction mechanism portion. Since the armature shaft is long in this way, the substantially central portion in the axial direction of the armature shaft is rotatably supported by a gear case (non-rotating body) forming a speed reduction mechanism portion via a bearing (bearing member), for example. I have to.

  In such a wiper motor, from the viewpoint of improving the assemblability and from the viewpoint of preventing the armature shaft from moving in the axial direction with respect to the gear case, a bearing is fixed in advance in a substantially central portion in the axial direction of the armature shaft. The armature shaft is assembled to the gear case by being fixed to the gear case. Thus, the armature shaft is rotatably supported by the gear case, and the armature shaft can be prevented from moving in the axial direction with respect to the gear case. Further, since the armature shaft does not move in the axial direction with respect to the gear case, there is an advantage that it is not necessary to provide thrust bearings on both ends of the armature shaft in the axial direction.

  As described above, as a technique for fixing the bearing member to the rotating shaft, for example, one described in Patent Document 1 is known. The technique described in Patent Document 1 relates to a fixing method for fixing a bearing member to a rotating shaft, and presses a rolling tool against the outer peripheral portion of the rotating shaft with a predetermined pressure to plastically deform a predetermined portion of the rotating shaft and thereby rotate. A raised portion protruding toward the radially outer side of the shaft is formed. And the bearing member is being fixed to the rotating shaft by the protruding part which arose by plastic deformation. Here, the rotation axis side of the rolling tool is inclined at a predetermined angle (0 ° to 45 °) so as to face the bearing member side, and thereby, control is performed so that a raised portion is appropriately generated on the bearing member side.

JP-T-2001-511239 (FIG. 1)

  However, according to the technique described in Patent Document 1 described above, a structure is adopted in which a raised portion formed by plastic deformation of the rotating shaft is brought into direct contact with the bearing member, and the bearing member is in the middle of plastic deformation of the rotating shaft. A large load is applied to the inner side in the radial direction. In this case, there is a possibility that the radial inner side of the bearing member may be distorted depending on how the bulging portion is formed. There is a risk of being.

  Therefore, it is conceivable to reduce the load applied to the bearing member in order to eliminate the distortion of the bearing member, but in this case, the fixing strength of the bearing member with respect to the rotating shaft is reduced. Here, the cause of the decrease in the fixing strength is that, in order to facilitate the mounting of the bearing member on the rotating shaft, an annular arc portion, a tapered portion, etc. in advance at the axial end of the bearing member and radially inward. It is mentioned that it is formed. That is, specifically, the bulging portion plastically deformed by reducing the load applied to the bearing member does not reach the gap between the arc portion (taper portion) and the rotating shaft, and this is fixed to the rotating shaft of the bearing member. The strength will be reduced.

  Furthermore, since the raised portion is formed in a state where the bearing member is movable in the axial direction with respect to the rotating shaft, it is necessary to control the rolling tool with high accuracy on both axial sides of the bearing member. If the control (pressing force, etc.) of each rolling tool varies, there will be problems such as the bearing member moving with respect to the rotating shaft during processing, and molding on both axial sides of the bearing member will occur. Inconveniences such as the protruding height of the raised ridges differing may also occur.

  An object of the present invention is to provide a rotating shaft that can firmly fix the bearing member to the rotating shaft without causing distortion in the bearing member, and that does not require the machining apparatus to be controlled with high accuracy, and a method for manufacturing the rotating shaft.

The rotating shaft of the present invention is a rotating shaft that is rotatably supported by a non-rotating body via a bearing member, and is attached to the supporting portion and a supporting portion formed of an annular groove extending in the circumferential direction of the rotating shaft. A first movement restricting member that supports one side in the axial direction of the bearing member that is attached to the outer peripheral portion of the rotating shaft by insertion, and restricts movement of the bearing member to the one side in the axial direction with respect to the rotating shaft; The bearing member is provided on a side opposite to the first movement regulating member side along the axial direction of the bearing member, and is attached to an outer peripheral portion of the rotating shaft by insertion, and supports the other axial side of the bearing member, and the bearing member A second movement restricting member that restricts movement of the rotating shaft to the other side in the axial direction, and a second movement restricting member that is provided on the other side in the axial direction from the second movement restricting member of the rotating shaft, and the outer peripheral portion of the rotating shaft is plastic formed in the circumferential direction of the rotary shaft by deforming Forming an annular groove, provided on both axial sides of the rotational axis of the annular groove, and a bulging portion which bulges radially outward by plastic deformation, the bulging portion of the second movement regulating member side And a movement restriction convex part for restricting movement of the second movement restriction member to the other side in the axial direction with respect to the rotation axis, and between the other side in the axial direction of the second movement restriction member and the rotation axis. The gap dimension is smaller than the gap dimension between the other axial side of the bearing member and the rotating shaft .

A method for manufacturing a rotating shaft according to the present invention is a method for manufacturing a rotating shaft that is rotatably supported by a non-rotating body via a bearing member, and a support portion formed of an annular groove extending in a circumferential direction of the rotating shaft. A first step of mounting a first movement restricting member that supports one side of the bearing member in the axial direction and restricts movement of the bearing member to the one side in the axial direction with respect to the rotating shaft; and A second step of inserting the bearing member on the other side in the axial direction of the first movement restricting member in the outer peripheral portion of the rotating shaft, and supporting the other side in the axial direction of the bearing member. The clearance dimension between the other side in the axial direction and the rotation shaft in the mounting state on the rotation shaft is made smaller than the clearance dimension between the other side in the axial direction of the bearing member and the rotation shaft, A second for restricting movement of the member to the other side in the axial direction with respect to the rotation shaft A third step of inserting a movement restricting member from the other side in the axial direction of the rotary shaft, and mounting the second movement restricting member on the other side in the axial direction of the bearing member in the outer peripheral portion of the rotary shaft; and at least two The rotating shaft is mounted on a processing device having a roller die, and the rotating shaft side of each roller die is inclined at a predetermined angle so as to face the other side in the axial direction, and each roller die is rotated and driven close to the rotating shaft. Then, by plastically deforming the other side in the axial direction of the outer peripheral portion of the rotating shaft with respect to the second movement restricting member, a part of the rotating shaft bulges radially outward on both sides in the axial direction of the roller die. the bulged portion is formed by the movement restriction projection for forming the bulging portion of the second movement restricting member, further comprising a fourth step of Ru is supported in the axial direction other side of the second movement restricting member It is characterized by.

  According to the rotating shaft of the present invention, the support member formed on the rotating shaft supports the first movement restricting member that restricts the movement of the bearing member to the one side in the axial direction, and moves the bearing member to the other side in the axial direction. A second movement restriction member for restriction is provided, and a movement restriction protrusion that bulges radially outward by plastically deforming the rotation shaft on the other side in the axial direction than the second movement restriction member of the rotation shaft is provided. The movement of the second movement restricting member to the other side in the axial direction is restricted by the portion. Therefore, the movement restricting convex portion formed by plastic deformation of the rotating shaft does not directly contact the bearing member but contacts the second movement restricting member, so that the bearing member can be prevented from being distorted. Therefore, the bearing member can be firmly fixed to the rotating shaft without impairing the function as a bearing. Further, since the movement restricting convex portion can be formed in a state where the bearing member is restricted to move to one side in the axial direction by the first movement restricting member, the bearing member does not move relative to the rotating shaft when the movement restricting convex portion is formed. . Therefore, it is not necessary to control the processing apparatus with high accuracy.

  According to the rotating shaft of the present invention, the clearance dimension between the other axial direction side of the second movement restricting member and the rotating shaft is smaller than the clearance dimension between the other axial direction side of the bearing member and the rotating shaft. The movement of the second movement restricting member to the other side in the axial direction can be restricted without causing the movement restricting convex portion to bulge greatly outward in the radial direction. Therefore, it is possible to reduce the processing time required for forming the movement restricting convex portion and to simplify the processing process and save energy. Further, it is possible to suppress the distortion of the rotating shaft due to the deformation of the rotating shaft.

  According to the rotating shaft manufacturing method of the present invention, the first step of mounting the first movement restricting member on the support portion of the rotating shaft, and the second step of disposing the bearing member on the other side in the axial direction of the first movement restricting member. And a third step of disposing the second movement restricting member on the other axial side of the bearing member, and attaching the rotating shaft to the processing apparatus, rotating each roller die close to the rotating shaft, 2 Plastic deformation of the other side in the axial direction than the movement restricting member causes a part of the rotating shaft to bulge radially outward to form a movement restricting convex portion that supports the other side in the axial direction of the second movement restricting member. And a fourth step. As a result, through the first step to the fourth step, it is possible to manufacture a rotary shaft in which the bearing member is firmly fixed without causing distortion in the bearing member. Further, since the movement restricting convex portion is formed only on the other side in the axial direction of the second movement restricting member, it is not necessary to control the processing apparatus with high accuracy.

  According to the rotating shaft manufacturing method of the present invention, in the fourth step, each roller die is inclined at a predetermined angle so that the rotating shaft side of each roller die faces the other side in the axial direction. An annular gap having a substantially triangular cross section can be formed between the members. The pressing direction of each roller die against the rotation shaft can be directed to the other side of the rotation shaft, and the movement restricting convex portion can be efficiently guided to the annular gap. The movement restricting convex part can be formed along the end surface on the other axial side of the second movement restricting member, and the fixing strength of the second movement restricting member with respect to the rotating shaft can be improved.

It is explanatory drawing which shows the vehicle carrying the wiper motor provided with the rotating shaft which concerns on this invention. It is a perspective view which shows the detailed structure of the wiper motor of FIG. FIG. 3 is an enlarged cross-sectional view of a cross section of a broken line circle I portion of FIG. FIG. 3 is an enlarged cross-sectional view of a section of a broken-line circle II portion of FIG. FIG. 3 is an enlarged cross-sectional view of a cross section of a broken line circle III portion of FIG. It is explanatory drawing explaining the operation | work procedure at the time of fixing a ball bearing to an armature shaft. It is explanatory drawing explaining operation | movement (preparation stage) of the processing apparatus at the time of shape | molding a movement control convex part to an armature axis | shaft. It is explanatory drawing explaining operation | movement (processing stage) of the processing apparatus at the time of shape | molding a movement control convex part to an armature axis | shaft. (A), (b) is the elements on larger scale of the broken-line circle | round | yen B part of FIG. 8 explaining the shaping | molding state (plastic deformation state of an armature shaft) of a movement control convex part.

  Hereinafter, a rotating shaft according to an embodiment of the present invention will be described in detail with reference to the drawings.

  1 is an explanatory view showing a vehicle equipped with a wiper motor having a rotating shaft according to the present invention, FIG. 2 is a perspective view showing a detailed structure of the wiper motor of FIG. 1, and FIG. 3 is a broken circle I portion of FIG. FIG. 4 is an enlarged sectional view of the section viewed from the direction of arrow A, FIG. 4 is an enlarged sectional view of the section of the broken line circle II in FIG. 2 viewed from the direction of arrow A, and FIG. Enlarged sectional views viewed from the direction of arrow A are respectively shown.

  As shown in FIG. 1, a front windshield 11 is provided on the front side of a vehicle 10 such as an automobile, and rainwater or dust attached to the front windshield 11 is disposed at a front end portion of the front windshield 11 in the vehicle 10. The wiper device 12 for wiping off is mounted. The wiper device 12 includes a wiper member 13 that is paired on the driver seat side and the passenger seat side, and further includes a wiper motor 14. The wiper motor 14 is connected to the base end side of each wiper member 13 via a link mechanism 15 so that each wiper blade 13 a provided on the front end side of each wiper member 13 is driven to swing on the front windshield 11. It has become.

  The wiper motor 14 is a forward / reverse rotation type wiper motor (so-called reversing wiper motor) that alternately performs forward rotation and reverse rotation based on a predetermined control logic. Therefore, when the wiper motor 14 repeats forward and reverse rotation, each wiper blade 13a performs a reciprocating wiping operation in each wiping range 11a shown in FIG. 1, thereby wiping rainwater, dust, and the like adhering to the front windshield 11. be able to.

  As shown in FIG. 2, the wiper motor 14 includes a motor unit 20 and a speed reduction mechanism unit 30. The motor unit 20 and the speed reduction mechanism unit 30 are connected to each other by a plurality of fastening screws 16 (only one is shown in the drawing). ing. In FIG. 2, the cover member 50 (see FIG. 5) that covers the gear case 31 of the speed reduction mechanism unit 30 is omitted for easy understanding of the internal structure.

  As shown in FIGS. 2 and 3, the motor unit 20 includes a motor case (yoke) 21 formed in a bottomed cylindrical shape, and the motor case 21 is formed by deep drawing (press forming) a magnetic material such as a steel plate. By doing so, the bottom side (left side in the figure) is formed to have a stepped shape. A first radial bearing 22 is provided on the bottom 21a of the motor case 21, and the first radial bearing 22 is fixed to the bottom 21a by a fixing member 23 made of a steel plate. The first radial bearing 22 rotatably supports one end side (left side in the figure) of an armature shaft 24 as a rotating shaft.

  Inside the motor case 21, a plurality of permanent magnets 25 (for example, four) having a substantially arc-shaped cross section are arranged so as to face each other. Inside each permanent magnet 25, an armature 26 around which a coil (not shown) is wound via a predetermined gap is rotatably provided, and an armature shaft 24 is fixed through the armature 26 at the center of rotation. ing.

  A commutator (not shown) in which a plurality of brushes (for example, three) are in sliding contact with the armature shaft 24 on the gear case 31 side (right side in the figure) from the armature 26 is provided. A drive current is supplied to the coil of the armature 26. As a result, an electromagnetic force (rotational force) is generated in the armature 26, and the armature 26 rotates with the armature shaft 24 at a predetermined rotation direction / number of rotations.

  As shown in FIGS. 2 and 5, the speed reduction mechanism unit 30 includes a bottomed gear case 31. The gear case 31 is formed into a predetermined shape by casting a molten aluminum material or the like, and a worm wheel 32 made of a resin material such as plastic is rotatably accommodated therein. The proximal end side of the output shaft 33 is fixed to the rotation center of the worm wheel 32, and the distal end side of the output shaft 33 extends to the outside of the gear case 31. As shown in FIG. 1, one end side of a link plate 15 a that forms the link mechanism 15 is fixed to the distal end side of the output shaft 33.

  Gear teeth 32 a are formed on the outer periphery of the worm wheel 32, and the gear teeth 32 a mesh with a worm 24 a that is integrally provided on the other end side (right side in the drawing) of the armature shaft 24. Here, the worm 24a and the worm wheel 32 constitute a speed reduction mechanism. The speed reduction mechanism reduces the rotation of the armature shaft 24 to a predetermined rotational speed to increase the torque, and outputs the increased torque to the output shaft. 33 outputs to the outside (link mechanism 15).

  As shown in FIGS. 2, 4 and 5, the gear case 31 is integrally formed with an armature shaft support portion 34 and a bearing support portion 35. The armature shaft support portion 34 is formed in a substantially cylindrical shape, and a cylindrical second radial bearing 36 is fitted and fixed inside the armature shaft support portion 34, and the second radial bearing 36 is rotatable on the other end side of the armature shaft 24. I support it.

  The bearing support portion 35 is also formed in a substantially cylindrical shape, and the bearing support portion 35 has a larger diameter than the armature shaft support portion 34. A ball bearing 40 as a bearing member is fitted and fixed inside the bearing support portion 35. As shown in FIG. 4, the ball bearing 40 is fitted together with the armature shaft 24 to the bearing support portion 35 from the direction of the arrow (a) in the drawing, and then the stopper member 37 made of a steel plate is inserted into the gear case from the direction of the arrow (b) in the drawing. By being inserted into 31, the state is prevented. That is, the ball bearing 40 is clamped by the bearing support portion 35 and the stopper member 37, and is thereby firmly fixed to the gear case 31. In addition, the gear case 31 provided with the bearing support part 35 comprises the non-rotating body in this invention.

  The armature shaft 24 is provided in parallel along the longitudinal direction (left and right direction in the drawing) of the wiper motor 14 and extends from the motor case 21 to the gear case 31. As shown in FIG. 3, one end side of the armature shaft 24 is rotatably supported only by the first radial bearing 22, and the support by the thrust bearing is omitted. Further, the other end side of the armature shaft 24 is rotatably supported only by the second radial bearing 36 as shown in FIG. 5, and the support by the thrust bearing is omitted.

  As shown in FIG. 4, a ball bearing 40 that rotatably supports the armature shaft 24 is fixed between a substantially central portion along the axial direction of the armature shaft 24, that is, between the armature 26 and the worm 24a. The ball bearing 40 includes a steel inner ring (inner race) 41, an outer ring (outer race) 42, and a plurality of steel balls 43. Further, shields 44 that prevent leakage of sliding grease (not shown) held between the inner ring 41, the outer ring 42, and the steel balls 43 to the outside are provided on both sides in the axial direction of the ball bearing 40, respectively. Yes.

  A pair of annular tapered surfaces 41 a for facilitating the mounting of the ball bearing 40 to the armature shaft 24 is provided at the end in the axial direction of the inner ring 41 and radially inward. An annular gap S (see FIG. 9) is formed between each annular tapered surface 41a and the armature shaft 24. In addition, a pair of annular tapered surfaces 42 a for facilitating the mounting of the ball bearing 40 to the bearing support portion 35 is provided on the radially outer end of the outer ring 42 in the axial direction.

  As described above, the outer ring 42 is fixed to the bearing support portion 35 and the inner ring 41 is fixed to the armature shaft 24, whereby the armature shaft 24 is fixed to the motor case 21 and the gear case 31 so as not to move in the axial direction. The Therefore, support by thrust bearings on both axial sides of the armature shaft 24 can be omitted, and the number of parts is reduced.

  As shown in FIG. 4, an annular groove 24 b having a predetermined depth is formed at a substantially central portion in the axial direction of the armature shaft 24. The annular groove 24b is formed so as to extend in the circumferential direction of the armature shaft 24, and forms a support portion in the present invention. A C-type retaining ring 27 as a first movement restricting member is attached to the annular groove 24 b, and the outer diameter dimension of the C-shaped retaining ring 27 is set to be larger than the outer diameter dimension of the armature shaft 24. Thus, a step extending in the circumferential direction is formed on the outer periphery of the armature shaft 24.

  The radially inner side of the C-type retaining ring 27 is supported by an annular groove 24b, and the radially outer side of the C-shaped retaining ring 27 supports one side of the inner ring 41 in the ball bearing 40 in the axial direction. That is, the C-type retaining ring 27 restricts the movement of the ball bearing 40 toward the one side in the axial direction with respect to the armature shaft 24. Here, the C-type retaining ring 27 is a general-purpose component that is generally distributed, thereby suppressing an increase in the cost of the wiper motor 14. However, instead of the C-type retaining ring 27, other types of E-type retaining rings or the like can be used.

  A washer 28 made of steel is provided on the side opposite to the C-type retaining ring 27 side along the axial direction of the ball bearing 40. The washer 28 constitutes the second movement restricting member in the present invention, and, like the C-type retaining ring 27, forms a step extending in the circumferential direction on the outer periphery of the armature shaft 24. The clearance dimension between the other axial side of the washer 28 and the armature shaft 24 is larger than the clearance dimension (annular clearance S) between the annular tapered surface 41 a on the other axial side of the inner ring 41 and the armature shaft 24. Is set to a small value. The washer 28 supports the other side in the axial direction of the inner ring 41 in the ball bearing 40, that is, the washer 28 restricts the movement of the ball bearing 40 to the other side in the axial direction with respect to the armature shaft 24.

  Here, the outer diameter dimensions of the C-type retaining ring 27 and the washer 28 are set larger than the outer diameter dimension of the annular gap S formed between each annular tapered surface 41a and the armature shaft 24. The retaining ring 27 and the washer 28 do not enter the annular gap S.

  On the other side in the axial direction than the washer 28 of the armature shaft 24, a movement restricting convex portion 24 c that restricts the movement of the washer 28 toward the other side in the axial direction with respect to the armature shaft 24 is provided. The movement restricting convex portion 24 c is formed over the entire circumference of the armature shaft 24, and the outer peripheral portion of the armature shaft 24 with the C-type retaining ring 27, the ball bearing 40 and the washer 28 mounted on the armature shaft 24. Is formed to bulge radially outward by plastic deformation. Accordingly, the movement restricting convex portion 24c is in close contact with the other side in the axial direction of the washer 28, and the rattling of the ball bearing 40 and the washer 28 is surely suppressed.

  The gear case 31 is closed by a cover member 50 (not shown in detail) as shown in FIG. The cover member 50 is formed of a resin material such as plastic and has substantially the same outer shape as the opening of the gear case 31, and a control board 51 is mounted on the inside thereof. The control board 51 is equipped with an armature shaft magnetic sensor (not shown) for detecting the rotation state of the armature shaft 24, a worm wheel magnetic sensor WS for detecting the rotation state of the worm wheel 32, and a capacitor C and a choke. Electronic components such as a coil (not shown) are also mounted.

  In addition, a partition between the worm wheel 32 and the control board 51 that prevents sliding grease (not shown) applied between the worm wheel 32 and the worm 24a from scattering and adhering to the control board 51. A member 52 is provided.

  Next, a procedure for fixing the ball bearing 40 to the armature shaft 24, that is, a method for manufacturing the armature shaft 24 will be described in detail with reference to the drawings.

  FIG. 6 is an explanatory diagram for explaining the work procedure when the ball bearing is fixed to the armature shaft, and FIG. 7 is an explanatory diagram for explaining the operation (preparation stage) of the processing apparatus when the movement restricting convex portion is formed on the armature shaft. 8 is an explanatory view for explaining the operation (processing stage) of the processing apparatus when forming the movement restricting convex portion on the armature shaft, and FIGS. 9A and 9B are molding states of the movement restricting convex portion (FIG. FIG. 9 is a partially enlarged view of a broken-line circle B part in FIG. 8 for explaining the plastic deformation state of the armature shaft.

[Preparation process]
First, as shown in FIG. 6, in another manufacturing process (not shown), an armature shaft 24 in which a worm 24a and an annular groove 24b are formed in advance by rolling or cutting is prepared. Further, a C-type retaining ring 27, a washer 28, and a ball bearing 40 are prepared.

[First step]
Next, as indicated by an arrow (1) in the figure, the C-type retaining ring 27 is expanded radially outward using a jig or the like (not shown). Next, the open side of the C-type retaining ring 27 is made to face the annular groove 24b of the armature shaft 24 as indicated by an arrow (2) in the figure under the state. Then, the C-type retaining ring 27 is attached to the annular groove 24 b and a jig or the like is removed from the C-type retaining ring 27. Thereby, the mounting process of the C-type retaining ring 27 in the annular groove 24b is completed. Here, the mounting step of the C-type retaining ring 27 in the annular groove 24b constitutes the first step in the manufacturing method of the present invention.

[Second step]
Next, as indicated by an arrow (3) in the figure, the ball bearing 40 is exposed from the other axial side of the armature shaft 24, that is, from the worm 24a side. Then, the armature shaft 24 is inserted into the inner ring 41 of the ball bearing 40, and the ball bearing 40 is disposed on the other side in the axial direction of the C-type retaining ring 27. At this time, since the annular tapered surface 41a is provided on the radially inner side of the inner ring 41, the armature shaft 24 can be easily inserted. Thereby, one axial direction side of the inner ring 41 abuts on the other axial side of the C-type retaining ring 27, and the mounting process of the ball bearing 40 to the armature shaft 24 is completed. Here, the mounting process of the ball bearing 40 to the armature shaft 24 constitutes the second process in the manufacturing method of the present invention.

[Third step]
Next, as shown by an arrow (4) in the figure, the washer 28 is made to face from the worm 24a side of the armature shaft 24. Then, the armature shaft 24 is inserted into the washer 28, and the washer 28 is disposed on the other axial side of the ball bearing 40. Thereby, the axial direction one side of the washer 28 contacts the other axial direction side of the inner ring 41 in the ball bearing 40, and the mounting process of the washer 28 to the armature shaft 24 is completed. Here, the mounting process of the washer 28 to the armature shaft 24 constitutes the third process in the manufacturing method of the present invention.

[Fourth step]
Next, the temporarily assembled armature shaft 24 that has finished the third step is mounted on a support base (not shown) of the processing apparatus (rolling apparatus) M.

  As shown in FIG. 7, the processing apparatus M includes a pair of roller dies RD. The roller dies RD are arranged to face each other so that the armature shaft 24 is sandwiched from the outside in the radial direction with the armature shaft 24 set in the processing apparatus M, and are arranged in the same direction (for example, counterclockwise direction) by a driving mechanism (not shown). The rotation is controlled. Further, the roller dies RD are controlled to approach or separate from each other by a drive mechanism (not shown), and further, the inclination angle of the roller dies RD can be controlled with respect to the armature shaft 24 as shown in FIG. However, the processing device M is not limited to the processing device M including two roller dies RD, and may be a processing device including three roller dies at equal intervals (60 ° intervals).

  First, each roller die RD is rotationally driven at a predetermined rotational speed in the direction of the arrow (5) in the figure. Next, each roller die RD is moved in the direction of the arrow (6) in the drawing, that is, the rotation axis C1 of each roller die RD is moved closer to each other. Then, as shown in FIG. 8, the outer peripheral edge of each roller die RD comes into contact with a portion of the armature shaft 24 that is close to the other side in the axial direction of the washer 28. As each roller die RD contacts the armature shaft 24, the armature shaft 24 rotates about the rotation axis C2 in the direction opposite to that of each roller die RD, as indicated by an arrow (7) in the figure.

  Thereafter, the driving force of the processing apparatus M is increased to further move the rotating shaft C1 of each roller die RD closer to each other, and each roller die RD is moved with respect to the armature shaft 24 as indicated by an arrow (8) in the figure. Slowly tilt. At this time, each roller die RD is tilted to the ball bearing 40 side so that the armature shaft 24 side of each roller die RD faces the other axial direction of the ball bearing 40. Here, the inclination angle (predetermined angle) α ° of each roller die RD is set to “0 ° to −5 °” such that each roller die RD does not contact the ball bearing 40 and the washer 28.

  Next, as shown by the arrow (9) in FIG. 9A, when the driving force of the processing apparatus M is further increased, the armature shaft 24 has a force that moves in the direction of the arrow (10) in the figure. Works. Thereby, the ball bearing 40 comes into close contact with the C-type retaining ring 27, and the washer 28 comes into close contact with the inner ring 41 of the ball bearing 40. In addition, an annular groove G is gradually formed in the contact portion of the armature shaft 24 with each roller die RD, and a part of the armature shaft 24 plastically flows as indicated by an arrow (11) in the drawing. Thereby, both sides of each roller die RD along the axial direction of the armature shaft 24 bulge radially outward.

  At this time, in order to incline each roller die RD at a predetermined angle α °, a part of the armature shaft 24 plastically flowed, that is, a movement restricting convex portion 24c in the middle of forming, is formed between each roller die RD and the washer 28. The cross section is guided to the substantially triangular annular gap T, and becomes larger along the end face 28a on the other axial side of the washer 28. Therefore, the movement restricting convex portion 24c comes into close contact with the washer 28 while pressing the washer 28 toward one side in the axial direction. Further, a gap (not shown) between the washer 28 and the armature shaft 24 is much smaller than the annular gap S between each annular taper surface 41a and the armature shaft 24, and therefore, the movement restricting projection in the middle of molding. The part 24c cannot enter. Therefore, the washer 28 is not distorted or cracked. Further, since the gap between the washer 28 and the armature shaft 24 is small, the ball bearing 40 and the washer 28 can be firmly fixed to the armature shaft 24 even if the bulging amount of the movement restricting convex portion 24 c is reduced. Therefore, the energy consumption of the processing apparatus M can be suppressed to save energy. Furthermore, since each roller die RD is equally pressed against the armature shaft 24 at the same time, distortion of the armature shaft 24 that is plastically deformed can be suppressed.

  Thereafter, as shown in FIG. 9B, when the bulging height of the movement restricting convex portion 24c reaches a predetermined height CH, the processing apparatus M is returned to the initial state. That is, as shown by an arrow (12) in the figure, each roller die RD is controlled to be separated from the armature shaft 24, whereby the ball bearing 40 is fixed to the armature shaft 24, and the armature shaft 24 including the ball bearing 40 is completed. . The predetermined height CH of the movement restricting convex portion 24c is determined by the required fixing strength of the ball bearing 40 and the rigidity of the armature shaft 24. Here, the step of fixing the ball bearing 40 to the armature shaft 24 by the processing apparatus M constitutes the fourth step in the manufacturing method of the present invention.

  As described above in detail, according to the armature shaft 24 according to the present embodiment, the C-shaped retaining ring 27 that restricts the movement of the ball bearing 40 in one axial direction is supported in the annular groove 24b formed in the armature shaft 24. The washer 28 for restricting the movement of the ball bearing 40 to the other side in the axial direction is provided, and the armature shaft 24 is plastically deformed to the other side in the axial direction relative to the washer 28 of the armature shaft 24 to be bulged outward in the radial direction. A movement restricting convex part 24c is provided, and the movement restricting convex part 24c restricts the movement of the washer 28 to the other side in the axial direction.

  Therefore, the movement restricting convex portion 24c formed by plastic deformation of the armature shaft 24 contacts the washer 28 without directly contacting the ball bearing 40, so that the ball bearing 40 can be prevented from being distorted. Therefore, the ball bearing 40 can be firmly fixed to the armature shaft 24 without impairing the function as a bearing. Further, since the movement restricting convex portion 24c can be formed in a state where the ball bearing 40 is restricted to move to one side in the axial direction by the C-shaped retaining ring 27, the ball bearing 40 is moved relative to the armature shaft 24 when the movement restricting convex portion 24c is formed. There is no movement. Therefore, it is not necessary to control the machining apparatus M with high accuracy.

  Further, according to the armature shaft 24 according to the present embodiment, the clearance dimension between the other axial direction of the washer 28 and the armature shaft 24 is the clearance between the other axial direction of the inner ring 41 and the armature shaft 24. Since it is smaller than the dimension, the movement of the washer 28 to the other side in the axial direction can be restricted without causing the movement restricting convex portion 24c to bulge greatly outward in the radial direction. Therefore, it is possible to reduce the processing time required for forming the movement restricting convex portion 24c and to simplify the processing step and save energy. Further, distortion of the armature shaft 24 due to deformation of the armature shaft 24 can be suppressed.

  Furthermore, according to the method for manufacturing the armature shaft 24 according to the present embodiment, the first step of mounting the C-type retaining ring 27, the second step of mounting the ball bearing 40, and the third step of mounting the washer 28. And a fourth step of attaching the armature shaft 24 to the processing apparatus M and forming the movement restricting convex portion 24c by plastic deformation. Thereby, the armature shaft 24 in which the ball bearing 40 is firmly fixed can be manufactured without causing distortion in the ball bearing 40 through the first to fourth steps. Further, since the movement restricting convex portion 24c is formed only on the other side in the axial direction of the washer 28, it is not necessary to control the processing device M with high accuracy.

  Further, according to the manufacturing method of the armature shaft 24 according to the present embodiment, in the fourth step, each roller die RD is inclined by a predetermined angle α ° so that the armature shaft 24 side of each roller die RD faces the other side in the axial direction. Therefore, an annular gap T having a substantially triangular cross section can be formed between each roller die RD and the washer 28. The pressing direction of each roller die RD against the armature shaft 24 can be directed to the other side of the rotation shaft, and the movement restricting convex portion 24c can be efficiently guided to the annular gap T. The movement restricting convex portion 24c can be formed along the end surface 28a on the other axial side of the washer 28, and the fixing strength of the washer 28 with respect to the armature shaft 24 can be improved.

  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, each roller die RD is illustrated as being inclined by a predetermined angle α ° so that the armature shaft 24 side of each roller die RD faces the other side in the axial direction, but the present invention is not limited thereto. First, the roller dies RD do not have to be tilted at 0 ° according to the fixing strength of the ball bearing 40 with respect to the armature shaft 24 or the like. In this case, the control of the processing apparatus M can be further simplified.

  In the above embodiment, the ball bearing 40 is used as the bearing member. However, the present invention is not limited to this, and other types of bearing members such as a cylindrical roller bearing (roller bearing) are used. You can also.

  Further, in the above-described embodiment, the armature shaft 24 of the wiper motor 14 is shown as the rotating shaft. However, the present invention is not limited to this, and a deceleration used as a drive source for a power window device, a power slide door device, or the like. Applicable to armature shaft of motor with mechanism. In short, the use is not limited as long as it is a rotating shaft that is rotatably supported by a non-rotating body via a bearing member.

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Front windshield 11a Wiping range 12 Wiper device 13 Wiper member 13a Wiper blade 14 Wiper motor 15 Link mechanism 15a Link plate 16 Fastening screw 20 Motor part 21 Motor case 21a Bottom part 22 First radial bearing 23 Fixing member 24 Armature shaft axis)
24a Worm 24b Annular groove (support part)
24c Movement restriction convex part 25 Permanent magnet 26 Armature 27 C-type retaining ring (first movement restriction member)
28 Washer (second movement restricting member)
28a End face 30 Reduction mechanism 31 Gear case (non-rotating body)
32 Worm wheel 32a Gear teeth 33 Output shaft 34 Armature shaft support portion 35 Bearing support portion 36 Second radial bearing 37 Stopper member 40 Ball bearing (bearing member)
41 Inner ring 41a Annular taper surface 42 Outer ring 42a Annular taper surface 43 Steel ball 44 Shield 50 Cover member 51 Control board 52 Partition member C Capacitor G Annular groove M Processing device S, T Annular gap RD Roller die WS Magnetic sensor for worm wheel

Claims (2)

A rotating shaft rotatably supported by a non-rotating body via a bearing member,
A support portion comprising an annular groove extending in the circumferential direction of the rotation shaft;
A first member that is attached to the support portion, supports one side in the axial direction of the bearing member that is attached to the outer peripheral portion of the rotating shaft, and restricts movement of the bearing member to one side in the axial direction with respect to the rotating shaft. 1 movement restricting member;
The bearing member is provided on a side opposite to the first movement regulating member side along the axial direction of the bearing member, and is attached to an outer peripheral portion of the rotating shaft by insertion, and supports the other axial side of the bearing member, and the bearing member A second movement restriction member for restricting movement of the rotation axis to the other side in the axial direction;
An annular groove provided on the other side in the axial direction than the second movement restricting member of the rotating shaft, and formed in the circumferential direction of the rotating shaft by plastically deforming an outer peripheral portion of the rotating shaft;
A bulging portion provided on both axial sides of the rotating shaft of the annular groove and bulging radially outward by plastic deformation ;
A movement restriction convex part that forms the bulging part on the second movement restriction member side and restricts the movement of the second movement restriction member to the other side in the axial direction with respect to the rotation axis ;
Rotation characterized in that a gap dimension between the other axial side of the second movement restricting member and the rotary shaft is smaller than a gap dimension between the other axial side of the bearing member and the rotary shaft. axis. A method of manufacturing a rotating shaft that is rotatably supported by a non-rotating body via a bearing member,
A first movement restriction that supports one side in the axial direction of the bearing member and supports movement of the bearing member toward the one side in the axial direction with respect to the support portion formed of an annular groove extending in the circumferential direction of the rotation shaft. A first step of mounting the member;
A second step of inserting the bearing member from the other side in the axial direction of the rotary shaft, and mounting the bearing member on the other side in the axial direction of the first movement restriction member in the outer peripheral portion of the rotary shaft;
The other axial direction side of the bearing member is supported, and a clearance dimension between the other axial direction side and the rotating shaft in the mounting state on the rotating shaft is between the other axial direction side of the bearing member and the rotating shaft. A second movement restricting member that is smaller than the gap dimension between them and restricts the movement of the bearing member to the other side in the axial direction with respect to the rotation shaft is inserted from the other side in the axial direction of the rotation shaft, and the second movement A third step of mounting the regulating member on the other axial side of the bearing member in the outer peripheral portion of the rotating shaft;
The rotating shaft is mounted on a processing apparatus having at least two roller dies , the rotating shaft side of each roller die is inclined at a predetermined angle so as to face the other side in the axial direction, and the rotating shaft is rotated while driving each roller die. And a part of the rotating shaft expands radially outward on both sides of the roller die in the axial direction by plastically deforming the other side in the axial direction of the outer peripheral portion of the rotating shaft with respect to the second movement restricting member. out was bulges formed by the movement restriction projection for forming the bulging portion of the second movement regulating member side, and a fourth step of Ru is supported in the axial direction other side of the second movement restricting member The manufacturing method of the rotating shaft characterized by the above-mentioned.

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