JP2010193644A - Motor and method for assembling the motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor having a bearing fixing member that is strong against deformation. <P>SOLUTION: A bearing support part 24b opened to a motor body side, and an insertion hole 46 formed on an opening side of the bearing support part 24b are provided on a gear case 20. The insertion hole 46 extends in the radial direction of a motor shaft 13 and is opened to the gear cover side. A bearing 28 that rotatably supports the motor shaft 13 is fitted into the bearing support part 24b, and fixed to the gear case 20 by a fixing plate 47 inserted into the insertion hole 46. An assembling hole 48 into which the bearing 28 can be inserted, and a shaft hole 49 into which the motor shaft 13 can be inserted are communicated with each other in the inserting direction of a fixing plate 47 and formed at this fixing plate 47. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor including a bearing that rotatably supports a motor shaft and a method for assembling the motor.

  For example, a motor is used as a drive source for a wiper device or a power window device mounted on a vehicle. The motor has a motor body including a motor shaft and a frame to which the motor body is attached. The frame is provided with a motor connection portion that opens to the motor body side, and the motor body is attached to the motor connection portion. By the way, the base end side of the motor shaft is rotatably supported by a bearing on the bottom wall of a bottomed cylindrical yoke provided in the motor body. Further, the front end side of the motor shaft protruding into the frame is rotatably supported by a bearing mounted in the frame (see, for example, Patent Document 1). As described above, in a motor in which a bearing that supports a motor shaft is mounted in a frame, it is common to mount a bearing that is previously mounted on the motor shaft in the frame together with the motor body from the viewpoint of assembly. It is. At this time, if there is a slight gap between the bearing and the frame, noise is generated when the motor is operated due to the shakiness of the bearing. Therefore, it is necessary to fix the bearing to the frame without backlash.

  Therefore, in the motor described in Patent Document 1, after the bearing is mounted on the cylindrical bearing support portion that opens to the motor body side, the bearing fixing member is inserted into the insertion hole formed on the opening side of the bearing support portion. By doing so, the bearing is fixed in the frame. As a result, the axial movement of the bearing is restricted between the bearing support portion and the bearing fixing member, and the bearing can be fixed to the frame without play.

Special table 2002-525005 gazette

  Thus, when the bearing fixing member is inserted into the insertion hole after the bearing is mounted on the bearing support portion, it is necessary to provide a groove for inserting the motor shaft in the bearing fixing member. Therefore, in the motor described in Patent Document 1, the bearing fixing member is formed in a U shape having a groove portion through which the motor shaft can be inserted. However, forming the bearing fixing member in a U shape causes a reduction in strength against deformation, particularly on the U-shaped non-connected side of the bearing fixing member. Therefore, for example, if the thrust load of the motor shaft is transmitted to the bearing and an excessive axial load acts on the bearing fixing member, the bearing fixing member may be deformed.

  Also, since the bearing fixing member is U-shaped, it is difficult to hold the bearing fixing member by hooking a rod or the like into the groove during heat treatment or surface treatment of the bearing fixing member. It is necessary to grip the fixing member. For this reason, there is a possibility that the bearing fixing member may be damaged by a jig or the like, or heat treatment or surface treatment may not be sufficiently performed in the grip portion.

  An object of the present invention is to provide a motor including a bearing fixing member that is resistant to deformation.

  The motor of the present invention includes a motor main body including a motor shaft, a frame to which the motor main body is attached, a bearing to be attached to the motor shaft, and the frame. A bearing support portion to which the bearing is mounted, and an assembly hole that is inserted into an insertion hole formed on the opening side of the bearing support portion and through which the bearing can be inserted communicate with a shaft hole through which the motor shaft can be inserted. A bearing fixing member formed as described above, wherein the bearing fixing member has an assembly position at which the bearing can be attached to the bearing support portion through the assembly hole, and the motor shaft in the shaft hole. A motor that is inserted into and is operated to a fixed position that restricts axial movement of the bearing between the bearing support portion.

  The motor according to the present invention is characterized in that a taper portion is formed on the distal end side in the insertion direction of the bearing fixing member.

  The motor of the present invention is characterized in that a convex portion is formed on the surface of the bearing fixing member.

  The motor according to the present invention is characterized in that an operation portion that protrudes in a direction perpendicular to the insertion direction is provided at a base end portion in the insertion direction of the bearing fixing member.

  In the motor according to the present invention, the bearing fixing member is provided with a locking claw protruding toward the inner surface of the insertion hole.

  In the motor of the present invention, the frame includes a bottomed case portion that opens in a direction orthogonal to the motor body side, and the cover that closes the opening side of the case portion has an insertion direction of the bearing fixing member. A protrusion that abuts on the base end side is provided.

  In the motor according to the aspect of the invention, the frame includes a substrate storage chamber that stores a control substrate that controls rotation driving of the motor shaft, and a partition wall that partitions the substrate storage chamber and the insertion hole is formed in the frame. It is characterized by providing.

  The motor assembly method of the present invention includes a motor body having a motor shaft, a frame to which the motor body is attached, a bearing to be attached to the motor shaft, and a bearing that is formed on the frame and opens to the motor body side. A motor mounting method comprising: a support portion; and a bearing fixing member formed by communicating an assembly hole through which the bearing can be inserted and a shaft hole through which the motor shaft can be inserted, the bearing support portion A step of inserting the bearing fixing member into an insertion hole formed on the opening side and opening the bearing support portion to the motor main body side through the assembly hole; and the bearing through the assembly hole. A step of attaching to the bearing support portion; and further inserting the bearing fixing member into the insertion hole, inserting the motor shaft into the shaft hole, and between the bearing fixing member and the bearing support portion. Characterized by a step of restricting the axial movement of the bearing.

  According to the present invention, since the assembly hole through which the bearing can be inserted and the shaft hole through which the motor shaft can be inserted are formed in communication with the bearing fixing member, the bearing fixing member has a substantially rectangular shape connected around the entire circumference. It becomes possible to do. Thereby, since the strength of the bearing fixing member can be improved, the deformation of the bearing fixing member can be suppressed. In addition, since the bearing fixing member is connected around the entire circumference, it is possible to hold the bearing fixing member by hooking a rod or the like to the assembly hole or the shaft hole during heat treatment or surface treatment of the bearing fixing member. It becomes possible. Therefore, since there is no need to grip the bearing fixing member with a jig or the like, the bearing fixing member is not damaged by the jig or the like, and heat treatment or surface treatment cannot be sufficiently performed at the holding portion. Furthermore, since the area contacting the inner surface of the insertion hole is increased, the heat dissipation performance of the heat radiated to the frame via the bearing fixing member is improved. As a result, it is possible to reliably prevent a malfunction from occurring in the control board and the like housed in the frame due to the influence of heat generated in the bearing.

It is a perspective view of the wiper motor which is one embodiment of the present invention. It is a disassembled perspective view of a wiper motor. It is sectional drawing which follows the AA line in FIG. It is sectional drawing which expands and shows a part of FIG. It is a top view which expands and shows a part of wiper motor in the state which removed the gear cover. It is the perspective view which looked at the bearing fixing member from the bearing side. It is a perspective view which shows the wiper motor which abbreviate | omitted one part along the BB line in FIG. It is explanatory drawing which shows one process at the time of assembling a bearing. It is explanatory drawing which shows one process at the time of assembling a bearing. It is explanatory drawing which shows one process at the time of assembling a bearing.

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

  As shown in FIGS. 1 to 3, the wiper motor 10 is provided in a wiper device mounted on a vehicle such as an automobile, and drives a link mechanism (not shown) connected to a wiper arm. The wiper motor 10 is a motor with a speed reduction mechanism in which a motor main body 11 and a speed reduction mechanism that reduces the rotation of the motor main body 11 and transmits it to a link mechanism are combined into one unit. The wiper motor 10 has a motor main body 11 as a driving source and a gear portion 12 having a speed reduction mechanism.

  The motor body 11 is a DC motor with a brush, and a motor shaft 13 provided in the motor body 11 can rotate in the forward direction and the reverse direction. The motor body 11 has a yoke 14 formed by press-forming a thin steel plate or the like into a bottomed stepped cylinder. On the inner surface of the yoke 14, a plurality of permanent magnets 15 magnetized in the N-pole and S-pole toward the inside in the radial direction are fixed alternately in the rotational direction of the motor shaft 13.

  Inside the yoke 14 is accommodated an armature (armature) 16 that faces each permanent magnet 15 via a minute gap (air gap). The armature 16 has an armature core 16a having a plurality of slots in the rotation direction. In each slot, a plurality of armature coils 16b are mounted by winding a conductive wire. A motor shaft 13 is provided through the shaft center of the armature 16. The end of the motor shaft 13 on one end side in the axial direction (left side in FIG. 3) is rotatably supported by a bearing 17 fixed to the bottom wall of the yoke 14.

  A commutator 18 that rotates integrally with the armature 16 is fixed to the motor shaft 13 adjacent to the other axial end of the armature 16 (right side in FIG. 3). The commutator 18 includes a plurality of segment pieces that are arranged at equal intervals in the rotational direction while being insulated from each other. A coil end of the corresponding armature coil 16b is electrically connected to each segment piece.

  The motor body 11 is attached to a gear case (frame) 20 of the gear portion 12 on the opening side of the yoke 14. The gear case 20 formed by aluminum die casting includes a substantially rectangular bottomed case portion 21 that opens in a direction perpendicular to the axial direction of the motor shaft 13 (upward in FIG. 3). The gear case 20 is provided with a resin gear cover 22 formed in a substantially similar outer shape to the case portion 21 by a plurality of mounting screws 23, and the opening side of the case portion 21 is closed by the gear cover 22.

  The gear case 20 is integrally formed with a motor connection portion 24 to which the motor body 11 is attached at a side end portion of the case portion 21. As shown in FIG. 3, the motor connection portion 24 has a stepped cylindrical shape that opens in a direction orthogonal to the motor body 11 side (left side in FIG. 3), that is, the opening side of the case portion 21. The motor connection portion 24 is located on the motor main body 11 side and has a brush holder housing portion 24a formed in a substantially oval cross section. The motor connection portion 24 is formed to have a smaller diameter than the brush holder housing portion 24a. And a bearing support portion 24b having a substantially cylindrical shape protruding toward the portion 21 side (right side in FIG. 3). The motor main body 11 is fixed to the end surface on the opening side of the motor connection portion 24 by a plurality of fixing screws 25 with the other axial end of the motor shaft 13 protruding into the case portion 21 via the motor connection portion 24. ing.

  A brush holder accommodating chamber 26 is formed in the brush holder accommodating portion 24a into which the commutator 18 is inserted. The brush holder housing chamber 26 houses a resin brush holder 27 located around the commutator 18. The brush holder 27 includes a pair of brushes 27 a that are urged radially inward by a spring member and that are in sliding contact with the outer peripheral surface of the commutator 18. When a drive current is supplied to the armature coil 16b via the pair of brushes 27a and the commutator 18 made of a conductive material, an electromagnetic force is generated in the armature 16 so that the motor shaft 13 is rotationally driven.

  The other axial end of the motor shaft 13 projecting into the gear case 20 is rotatably supported by bearings 28 and 29 fixed in the gear case 20. A bearing 28 that supports a substantially central portion in the axial direction of the motor shaft 13 is mounted in a bearing support portion 24b. On the other hand, a bearing 29 that supports the other axial end of the motor shaft 13 is mounted in the case portion 21. A worm 13 a is integrally formed on the outer peripheral surface of the motor shaft 13 on the other end side in the axial direction, located between the bearings 28 and 29.

  A worm wheel 30 that meshes with the worm 13a is rotatably accommodated in the case portion 21 adjacent to the worm 13a. An output shaft 31 extending in a direction opposite to the opening side of the case portion 21 (downward in FIG. 3) is fixed to the shaft center of the worm wheel 30. The output shaft 31 that rotates integrally with the worm wheel 30 protrudes from the bottom wall of the case portion 21, and is connected to the link mechanism of the wiper device at the tip portion. As a result, the rotation of the motor shaft 13 is transmitted to the output shaft 31 at a reduced speed via a speed reduction mechanism (worm gear mechanism) composed of the worm 13a and the worm wheel 30, and the link mechanism is driven.

  As shown in FIG. 3, in the case portion 21, a resin that partitions a speed reduction mechanism accommodation chamber 34 a that accommodates the speed reduction mechanism and a substrate accommodation chamber 34 b that accommodates a control board 35 that controls the rotation drive of the motor shaft 13. The cover member 36 made of is attached. The speed reduction mechanism accommodation chamber 34 a is formed between the cover member 36 and the bottom wall of the case portion 21. On the other hand, the substrate housing chamber 34 b is formed between the cover member 36 and the gear cover 22. That is, the inside of the case portion 21 is partitioned on the upper and lower sides in FIG. 3 by the cover member 36 disposed at the substantially central portion in the opening direction of the case portion 21. The brush holder accommodation chamber 26 and the speed reduction mechanism accommodation chamber 34a are partitioned by the bearing 28, so that the brush wear powder generated in the brush holder accommodation chamber 26 when the motor is operated enters the speed reduction mechanism accommodation chamber 34a. Is prevented.

  The cover member 36 is disposed on the other end side in the axial direction of the motor shaft 13 relative to the bearing support portion 24b, and covers the other end side in the axial direction of the motor shaft 13 and the worm wheel 30 from the opening side of the case portion 21. It has become. The cover member 36 includes a bottom wall 36b formed with a through hole 36a through which the radial center portion of the worm wheel 30 is inserted, and a side wall 36c extending from the outer periphery of the bottom wall 36b to the opening side of the case portion 21. ing. The control board 35 is housed in the cover member 36 and is locked by a plurality of locking claws provided at the tip of the side wall 36c. The cover member 36 prevents the grease applied to the meshing portion between the worm 13 a and the worm wheel 30 from adhering to the control board 35.

  The control substrate 35 attached to the substrate housing chamber 34b side of the cover member 36 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 substrate. In FIG. 3, illustration of electronic components mounted on the control board 35 is omitted.

  In order to detect the rotation of the motor shaft 13, a pair of hall sensors 37 are provided on the control board 35, and a sensor magnet 38 is fixed to the motor shaft 13 between the bearing 28 and the worm 13 a. The sensor magnet 38 is an annular multipolar magnetized magnet in which a plurality of magnetic poles are alternately magnetized in the circumferential direction. On the other hand, each hall sensor 37 is opposed to the sensor magnet 38 with a predetermined phase difference. As a result, when the motor shaft 13 rotates, a pulse signal having a period inversely proportional to the rotation number is output from each Hall sensor 37, and the control board 35 detects the rotation number of the motor shaft 13 from the period of the pulse signal. The control board 35 detects the rotation direction of the motor shaft 13 based on the order of appearance of the pulse signals from the hall sensors 37. These detection signals are used for controlling the rotational drive of the motor shaft 13 by the control board 35.

  As shown in FIG. 3, the control board 35 is electrically connected to a power feeding portion (power feeding connector) 27 b formed integrally with the brush holder 27 by a power feeding terminal 42 that is insert-molded in the gear cover 22. A conductive plate (not shown) that is electrically connected to the pair of brushes 27a is provided inside the power feeding portion 27b. The control board 35 is connected to a wiper switch and a battery (not shown) via a connector 43 provided on the gear cover 22. Thereby, the control board 35 supplies a current to the motor main body 11 in accordance with a command signal from the wiper switch, and controls the rotational drive of the motor shaft 13.

  Next, the structure for fixing the bearing 28 to the gear case 20 will be described in detail. 4 is an enlarged sectional view showing a part of FIG. 3, and FIG. 5 is an enlarged plan view showing a part of the wiper motor with the gear cover removed.

  As shown in FIG. 4, the bearing 28 includes an inner race 28 a fixed to a substantially central portion in the axial direction of the motor shaft 13, an outer race 28 b mounted in the bearing support portion 24 b of the gear case 20, and an inner race 28 a An annular ball bearing including a plurality of balls 28c arranged between the outer race 28b. By this bearing 28, the motor shaft 13 is rotatably supported by the bearing support portion 24b.

  The bearing support 24b is formed in a substantially cylindrical shape that opens to the motor body 11 side (left side in FIG. 4), that is, communicates with the brush holder housing chamber 26. The bearing support portion 24b includes a cylindrical wall portion 44a into which the outer race 28b of the bearing 28 is fitted, and a regulation wall portion 44b protruding radially inward from the other axial end portion of the cylindrical wall portion 44a. The bearing 28 is mounted in the bearing support portion 24b in a state where the other axial end surface of the outer race 28b is in contact with the stopper surface 45 on one axial end side of the regulating wall portion 44b. The inner diameter of the restriction wall 44b is set to a diameter that allows the sensor magnet 38 attached to the motor shaft 13 to be inserted.

  Further, an insertion portion 44c is formed at the opening side of the bearing support portion 24b, that is, at the connection portion between the bearing support portion 24b and the brush holder housing portion 24a. The insertion portion 44c is formed so as to protrude downward in FIG. 4 from one end portion in the axial direction of the cylindrical wall portion 44a and protrude in the left-right direction in FIG. 5 from one end portion in the axial direction of the cylindrical wall portion 44a. That is, the insertion portion 44 c is formed in a substantially rectangular shape extending in the radial direction of the motor shaft 13. An insertion hole 46 is formed in the insertion portion 44c adjacent to the bearing 28 mounted in the bearing support portion 24b. The insertion hole 46 is formed in a substantially rectangular shape corresponding to the shape of the insertion portion 44c and extending in the radial direction of the motor shaft 13, and is open to the gear cover 22 side (upper side in FIG. 4). The brush holder housing chamber 26 and the inside of the case portion 21 are communicated with each other through the insertion hole 46. A fixing plate (bearing fixing member) 47 for supporting the bearing 28 mounted on the bearing support portion 24 b from one end side in the axial direction is inserted into the insertion hole 46 from the opening side of the insertion hole 46. .

  FIG. 6 is a perspective view of the fixed plate as viewed from the bearing side, FIG. 7 is a perspective view of the wiper motor partially omitted along line BB in FIG. 3, and FIG. It is explanatory drawing which shows a process.

  As shown in FIG. 6, the fixing plate 47 is formed in a substantially rectangular plate shape that can be inserted into the insertion hole 46 by a metal thin plate. An assembling hole 48 formed to have a diameter larger than the outer diameter of the bearing 28 is provided at the distal end side (lower side in FIG. 6) of the fixing plate 47 in the thickness direction of the fixing plate 47 (axial direction of the motor shaft 13). It is formed to penetrate through. Through this assembly hole 48, the fixed plate 47 can insert the bearing 28 in the axial direction of the motor shaft 13. On the other hand, a shaft hole 49 formed to have a diameter larger than the outer diameter of the motor shaft 13 is formed in the insertion plate base end side (upper side in FIG. 6) of the fixed plate 47 so as to penetrate in the thickness direction of the fixed plate 47. ing. Through this shaft hole 49, the fixed plate 47 can be inserted through the motor shaft 13 in the axial direction. The assembly hole 48 and the shaft hole 49 are arranged with their axis centers shifted in the insertion direction of the fixed plate 47 and communicated with each other in the insertion direction of the fixed plate 47. In other words, the fixing plate 47 is formed with a substantially daruma-shaped through hole including an assembly hole 48 and a shaft hole 49.

  A tapered portion 47a is provided on the distal end side in the insertion direction of the fixed plate 47 so that the width direction (left and right direction in FIG. 5) of the fixed plate 47 decreases toward the distal end side in the insertion direction. On the other hand, an operation portion 47b is formed at the proximal end portion in the insertion direction of the fixed plate 47 so as to protrude in the axial direction proximal end side of the motor shaft 13, that is, in the vertical direction with respect to the insertion direction of the fixed plate 47, Is provided. The operation portion 47b improves the strength of the base end portion in the insertion direction of the fixed plate 47.

  Further, on the surface of the fixed plate 47, a convex portion 50 is formed which is subjected to concave and convex processing and protrudes toward the bearing 28 side. The convex portion 50 includes a substantially semicircular pressing portion 50a formed along the outer periphery of the shaft hole 49, an arc-shaped positioning portion 50b extending from both ends of the pressing portion 50a along the outer periphery of the assembly hole 48, A retaining portion 50c extending in the width direction of the fixed plate 47 at a connecting position between the pressing portion 50a and the positioning portion 50b, and a reinforcing portion 50d extending outward in the radial direction of the shaft hole 49 from the pressing portion 50a are provided. When the thrust load of the motor shaft 13 is transmitted to the bearing 28 and the axial load acts on the fixed plate 47, the force acting on the fixed plate 47 is dispersed throughout the convex portion 50. Can be suppressed.

  Further, as shown in FIG. 7, a pair of locking claws 51 projecting toward the inner surface of the insertion hole 46 is provided on the surface of the fixing plate 47 on one end side in the axial direction. The pair of locking claws 51 are provided at both ends in the width direction of the fixed plate 47 so as to sandwich the shaft hole 49. The locking claw 51 is formed in a wedge shape that inclines toward one end in the axial direction of the motor shaft 13 toward the proximal end in the insertion direction of the fixed plate 47.

  The fixing plate 47 is inserted into the insertion hole 46 when the bearing 28 is assembled to the gear case 20, and is operated to the assembling position shown in FIG. 8 and the fixing position shown in FIG. As shown in FIG. 8, when the fixing plate 47 is in the assembly position, the bearing support portion 24 b opens to the motor body 11 side through the assembly hole 48, so that the bearing 28 is moved through the assembly hole 48. The bearing support 24b can be mounted from the opening side. On the other hand, as shown in FIG. 7, when the fixed plate 47 is in the fixed position, the motor shaft 13 is inserted into the shaft hole 49 and is rotatable within the shaft hole 49. Further, as shown in FIG. 4, the pressing portion 50a of the fixing plate 47 abuts against one axial end surface of the outer race 28b of the bearing 28 and presses the outer race 28b toward the stopper surface 45. The bearing support 24b is fixed without play. That is, the axial movement of the bearing 28 is restricted between the bearing support portion 24 b and the fixed plate 47.

  Next, the procedure for assembling the bearing 28 to the gear case 20 will be described. FIG. 9 and FIG. 10 are explanatory views showing one process when the bearing is assembled.

  As shown in FIG. 9, a bearing 28 and a sensor magnet 38 are attached to the motor shaft 13 in advance, and the bearing 28 is unitized together with the motor body 11. First, the fixing plate 47 is inserted into the insertion hole 46 from the opening side of the insertion hole 46. When the fixing plate 47 is inserted into the insertion hole 46, it is performed by gripping the operation portion 47b of the fixing plate 47, so that the insertion operation is easy, and the projection direction of the operation portion 47b is adjusted to the bearing 28 side. Further, it is possible to prevent the fixing plate 47 from being inserted in the wrong direction. Further, since the tapered portion 47a is formed at the distal end side in the insertion direction of the fixed plate 47, the fixed plate 47 can be easily inserted into the insertion hole 46, and the assembling property of the fixed plate 47 is good. As shown in FIG. 10, when the fixing plate 47 is inserted to the assembly position, the positioning portion 50b of the fixing plate 47 is brought into contact with the outer peripheral portion of the cylindrical wall portion 44a of the bearing support portion 24b. As a result, the fixing plate 47 is accurately positioned at the assembly position without the positional displacement of the assembly hole 48 and the opening of the bearing support portion 24b. Under this assembly position, the bearing 28 can be attached to the bearing support portion 24b through the assembly hole 48.

  Subsequently, the bearing 28 attached to the motor shaft 13 is attached to the gear case 20 together with the motor body 11. The bearing 28 is inserted in the axial direction of the motor shaft 13 from the opening side of the bearing support portion 24 b and is fitted into the cylindrical wall portion 44 a of the bearing support portion 24 b through the assembly hole 48. As shown in FIG. 8, the movement of the bearing 28 toward the other end side in the axial direction is restricted by contacting the other end surface in the axial direction of the outer race 28b of the bearing 28 with the stopper surface 45 of the bearing support portion 24b. . In this state, since the bearing 28 is disposed on the other axial end side of the motor shaft 13 with respect to the insertion hole 46, the fixing plate 47 can be further inserted into the insertion hole 46 without interfering with the bearing 28.

  Then, the fixing plate 47 is further inserted into the insertion hole 46 from the assembly position. At this time, as the wedge-shaped locking claw 51 of the fixing plate 47 is inserted into the insertion hole 46, the fixing plate 47 is pressed against the bearing 28 side. Thus, when the fixed plate 47 is in the fixed position, the fixed plate 47 can obtain a sufficient urging force for pressing the outer race 28b of the bearing 28 against the stopper surface 45 side by the pressing portion 50a. That is, as shown in FIG. 7, when the fixed plate 47 is in the fixed position, the axial movement of the bearing 28 is restricted between the bearing support portion 24 b and the fixed plate 47, and the bearing 28 is fixed without play of the gear case 20. The Rukoto. At this time, the retaining portion 50 c of the fixed plate 47 is brought into contact with the outer peripheral portion of the bearing 28 on the front end side in the insertion direction of the fixed plate 47 with respect to the shaft center of the bearing 28. As a result, the retaining portion 50c is hooked and fixed to the outer peripheral portion of the bearing 28, so that the securing plate 47 is prevented from coming off from the insertion hole 46. Further, since the locking claw 51 of the fixing plate 47 is brought into contact with the inner surface of the insertion hole 46, the fixing plate 47 is prevented from coming out of the insertion hole 46 by the frictional force between the locking claw 51 and the inner surface of the insertion hole 46. Is prevented. Further, as shown in FIG. 4, when the gear cover 22 is attached to the gear case 20, the operation portion 47b of the fixed plate 47 disposed on the gear cover 22 side with respect to the cylindrical wall portion 44a of the bearing support portion 24b is integrated with the gear cover 22. The projecting portion 22a provided on the abutting portion abuts. This reliably prevents the fixing plate 47 from coming off from the insertion hole 46. Further, when the surface of the fixed plate 47 is brought into contact with the inner surface of the insertion hole 46, the heat generated in the bearing 28 is radiated to the gear case 20 via the fixed plate 47.

  As described above, the fixing plate 47 is connected to the entire circumference by forming the assembly hole 48 through which the bearing 28 can be inserted and the shaft hole 49 through which the motor shaft 13 can be inserted into the fixing plate 47. It becomes possible to make it rectangular. As a result, the strength of the fixed plate 47 can be improved. Therefore, even when the thrust load of the motor shaft 13 is transmitted to the bearing 28 and an excessive axial load is applied to the fixed plate 47, the deformation of the fixed plate 47 is reduced. Can be suppressed. In addition, since the fixed plate 47 has a shape connected around the entire circumference, a rod or the like is hooked on the assembly hole 48 or the shaft hole 49 to hold the fixed plate 47 during heat treatment or surface treatment of the fixed plate 47. It becomes possible. Therefore, there is no need to hold the fixing plate 47 with a jig or the like, and therefore the fixing plate 47 is not damaged by the jig or the like, and the heat treatment or surface treatment cannot be sufficiently performed at the holding portion. Furthermore, since the area contacting the inner surface of the insertion hole 46, that is, the gear case 20, can be increased, the heat dissipation of the heat generated in the bearing 28 is improved. Thereby, it is possible to reliably prevent the control board 35, the hall sensor 37, and the like from being affected by the heat generated in the bearing 28.

  As described so far, the bearing 28 is fixed to the gear case 20 without play by inserting the fixing plate 47 into the insertion hole 46 formed on the opening side of the bearing support 24b. Therefore, there is a possibility that the brush wear powder generated in the brush holder accommodating chamber 26 may enter the gear case portion 21 through the gap of the insertion hole 46. In this wiper motor 10, in order to prevent the brush wear powder from adhering to the control substrate 35 and preventing the wiper motor 10 from malfunctioning, the brush wear powder that has entered the case portion 21 is prevented from entering the substrate storage chamber 34 b. A partition wall 55 to be suppressed is provided in the case portion 21.

  The partition wall 55 is formed separately from the gear case 20, the gear cover 22, and the cover member 36 by a resin material. As shown in FIGS. 2 and 5, the partition wall 55 includes an opposing wall portion 55a extending in a direction orthogonal to the axial direction of the motor shaft 13 (left and right direction in FIG. 5), and both longitudinal ends of the opposing wall portion 55a. And a pair of side wall portions 55b extending to the motor body 11 side (upper side in FIG. 5). The facing wall portion 55a is provided close to the operation portion 47b of the fixed plate 47, and is provided on the other end side in the axial direction of the motor shaft 13 relative to the insertion hole 46, that is, on the substrate housing chamber 34b side. On the other hand, the side wall portion 55b is provided on the outer side in the longitudinal direction of the opposing wall portion 55a than the insertion hole 46 (outside in the left-right direction in FIG. 5). That is, the partition wall 55 has a substantially U-shaped cross section that surrounds the opening of the insertion hole 46 between the partition wall 55 and the brush holder housing portion 24 a of the motor connection portion 24. As shown in FIG. 4, the partition wall 55 abuts the end portion on the height direction base end side (gear case 20 side) and the end portion on the height direction front end side (gear cover 22 side) as the gear cover 22. It is in contact with the back of the.

  Thus, since the partition wall 55 that partitions the insertion hole 46 and the substrate accommodation chamber 34 b is provided in the case portion 21, the brush that has entered the case portion 21 from the brush holder accommodation chamber 26 via the insertion hole 46. It is possible to suppress the wear powder from entering the substrate storage chamber 34b. Therefore, it is possible to prevent the brush wear powder from adhering to the control board 35 and causing a problem in the control board 35. The partition wall 55 is not limited to a substantially U-shaped cross section and can be variously changed. However, the partition wall 55 is preferably formed in a bowl shape surrounding the insertion hole 46. Further, the end of the partition wall 55 on the base end side in the height direction and on the tip end side in the height direction are brought close to the gear case 20 and the gear cover 22 through a gap that can suppress the passage of the brush wear powder, respectively. May be. Further, the partition wall 55 is formed separately from the gear case 20, the gear cover 22 and the cover member 36. However, the present invention is not limited to this, and the partition wall 55 is integrated with the gear case 20, the gear cover 22 or the cover member 36. You may make it form in.

  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, although the motor of the present invention is applied to the wiper motor 10 in the above-described embodiment, the present invention can also be applied to motors other than the wiper motor 10. Further, the present invention is not limited to a motor in which the motor shaft 13 can rotate in both forward and reverse directions, and can be applied to a motor in which the motor shaft 13 can rotate in only one direction. Furthermore, the motor of the present invention is not limited to a motor with a speed reduction mechanism.

  In the above-described embodiment, the cover member 36 that partitions the speed reduction mechanism accommodation chamber 34a and the substrate accommodation chamber 34b is provided in the case portion 21, but the speed reduction mechanism accommodation chamber 34a and the substrate are provided without providing the cover member 36. The accommodation chamber 34b may be communicated.

  Furthermore, in the above-described embodiment, the operation portion 47b of the fixed plate 47 is formed in an L-shaped cross section that protrudes toward the other axial end of the motor shaft 13. However, the present invention is not limited to this, and the operation portion 47b is formed on the motor shaft. You may make it protrude to the 13 axial direction one end side.

10 Wiper motor (motor)
DESCRIPTION OF SYMBOLS 11 Motor main body 12 Gear part 13 Motor shaft 13a Worm 14 Yoke 15 Permanent magnet 16 Armature 16a Armature core 16b Armature coil 17 Bearing 18 Commutator 20 Gear case (frame)
DESCRIPTION OF SYMBOLS 21 Case part 22 Gear cover 22a Protrusion part 23 Mounting screw 24 Motor connection part 24a Brush holder accommodating part 24b Bearing support part 25 Fixing screw 26 Brush holder accommodating chamber 27 Brush holder 27a Brush 27b Power feeding part (power feeding connector)
28 Bearing 28a Inner race 28b Outer race 28c Ball 29 Bearing 30 Worm wheel 31 Output shaft 34a Deceleration mechanism accommodation chamber 34b Substrate accommodation chamber 35 Control board 36 Cover member 36a Through hole 36b Bottom wall 36c Side wall 37 Hall sensor 38 Sensor magnet 42 Power supply terminal 43 Connector 44a Cylindrical wall portion 44b Restriction wall portion 44c Insertion portion 45 Stopper surface 46 Insertion hole 47 Fixing plate (bearing fixing member)
47a Taper portion 47b Operation portion 48 Assembly hole 49 Shaft hole 50 Protruding portion 50a Pressing portion 50b Positioning portion 50c Retaining portion 50d Reinforcement portion 51 Locking claw 55 Partition wall 55a Opposing wall portion 55b Side wall portion

Claims (8)

A motor body having a motor shaft;
A frame to which the motor body is attached;
A bearing attached to the motor shaft;
A bearing support portion formed on the frame, opened to the motor body side and mounted with the bearing from the opening side;
An assembly hole that is inserted into an insertion hole formed on the opening side of the bearing support portion and through which the bearing can be inserted and a shaft fixing hole through which the motor shaft can be inserted have a bearing fixing member. And
The bearing fixing member is provided between the assembly position where the bearing can be mounted on the bearing support portion via the assembly hole, and the motor shaft inserted through the shaft hole and the bearing support portion. A motor that is operated to a fixed position that restricts axial movement of the motor.   The motor according to claim 1, wherein a taper portion is formed at a distal end side in the insertion direction of the bearing fixing member.   3. The motor according to claim 1, wherein a convex portion is formed on a surface of the bearing fixing member.   The motor according to any one of claims 1 to 3, wherein an operation portion that protrudes in a direction perpendicular to the insertion direction is provided at a base end portion in the insertion direction of the bearing fixing member. Motor.   The motor according to any one of claims 1 to 4, wherein the bearing fixing member is provided with a locking claw protruding toward an inner surface of the insertion hole.   The motor according to claim 1, wherein the frame includes a bottomed case portion that opens in a direction orthogonal to the motor main body side, and closes the opening side of the case portion. Has a protrusion abutting on the proximal end side in the insertion direction of the bearing fixing member.   7. The motor according to claim 1, wherein the frame includes a substrate storage chamber that stores a control substrate that controls rotation driving of the motor shaft, and includes a substrate storage chamber and the insertion hole. A motor characterized in that a partition wall for partitioning is provided in the frame. A motor body having a motor shaft;
A frame to which the motor body is attached;
A bearing attached to the motor shaft;
A bearing support that is formed in the frame and opens to the motor body;
An assembly method for a motor comprising an assembly hole through which the bearing can be inserted and a bearing fixing member formed by communicating a shaft hole through which the motor shaft can be inserted,
Inserting the bearing fixing member into an insertion hole formed on the opening side of the bearing support portion, and opening the bearing support portion on the motor body side through the assembly hole;
Attaching the bearing to the bearing support through the assembly hole;
A step of further inserting the bearing fixing member into the insertion hole, inserting the motor shaft through the shaft hole, and restricting axial movement of the bearing between the bearing fixing member and the bearing support portion; A method for assembling a motor, comprising:

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