JP2012080775A - Motor with speed reduction mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components without damaging functionality and to reduce manufacture cost.SOLUTION: A drum 23 to which a driving cable 13 is wound at an outer peripheral portion is integrally and rotatably assembled to a worm wheel 39. A drum cover 54 assembled to a gear case 31 to cover the drum 23 is arranged. An annular support projection 59 is disposed in the drum cover 54. Movement of the worm wheel 39 to a longitudinal direction of a spindle 45 is restricted by the annular support projection 59 via the drum 23. A snap ring, a washer and an installation groove, which are required in the conventional motor with speed reduction mechanism, can be omitted. Namely, coming-off of the worm wheel 39 from the spindle 45 is prevented by using the drum cover 54 which generally becomes a component on a window regulator-side in the power window motor 20. Thus, the number of components can be reduced without damaging the functionality, component management and molding processes are simplified and the manufacture cost can be reduced.

Description

  The present invention relates to a motor with a reduction mechanism having a yoke that rotatably accommodates an armature shaft, a reduction gear that decelerates rotation of the armature shaft, and a gear case that rotatably accommodates the reduction gear.

  2. Description of the Related Art Conventionally, a motor with a speed reduction mechanism capable of obtaining a large output while being small is used as a drive source for a power window device or the like mounted on a vehicle such as an automobile. The motor with a speed reduction mechanism includes a yoke that rotatably accommodates an amateur shaft, a reduction gear that reduces the rotation of the armature shaft, and a gear case that rotatably accommodates the reduction gear (for example, a patent) Reference 1). The rotation of the armature shaft is decelerated to a predetermined speed by the reduction gear, and the decelerated and increased torque output is output toward a driven object such as a window regulator.

  The geared motor (motor with a reduction mechanism) described in Patent Document 1 includes a gear housing (gear case) that rotatably accommodates a worm wheel (reduction gear), and the worm wheel is a circle provided in the gear housing. It is rotatably supported by a columnar support shaft (support shaft). The worm wheel is provided with a transmission plate having an output shaft that can rotate integrally therewith, and the worm wheel and the transmission plate are prevented from coming off from the support shaft by a snap ring (retaining ring). The rotation of the rotating shaft (amateur shaft) is transmitted to the worm wheel and output to the window regulator that meshes with the output shaft, whereby the window glass moves up and down.

Japanese Patent Laying-Open No. 2006-320151 (FIG. 2)

  However, according to the motor with the speed reduction mechanism described in Patent Document 1 described above, the snap ring is used to prevent the worm wheel from coming off from the support shaft, that is, to restrict the movement of the worm wheel in the axial direction. In addition to the snap ring, a washer is required, and a mounting groove for mounting the snap ring on a predetermined portion of the support shaft has to be formed. Accordingly, the management of the components of the snap ring and the washer, which are relatively small components, becomes complicated, and there are many molding processes for the components, which increases the manufacturing cost.

  An object of the present invention is to provide a motor with a speed reduction mechanism that can reduce the number of components and reduce the manufacturing cost without impairing functionality.

  The motor with a speed reduction mechanism of the present invention includes a yoke that rotatably accommodates an armature shaft, a speed reduction gear that decelerates rotation of the armature shaft, a speed reduction gear accommodating portion that accommodates the speed reduction gear, and a speed reduction gear accommodating portion. A support shaft that protrudes from the center and rotatably supports the reduction gear is formed. The gear case is connected to the yoke, and is assembled to be rotatable integrally with the reduction gear. A drum having a cable groove for winding a drive cable, a case mounting hole for mounting to the gear case, and a mounting leg for mounting to the vehicle body, and arranged to cover the drum A drum cover motor having a reduction mechanism, wherein the drum cover is provided with a support projection, and the reduction gear is moved in the longitudinal direction of the support shaft. But it characterized in that it is restricted by the supporting convex portion through the drum.

  In the motor with a speed reduction mechanism according to the present invention, the drum cover is formed with a movement restricting portion for restricting movement of the speed reduction gear in the longitudinal direction of the support shaft in contact with the speed reduction gear. .

  In the motor with a speed reduction mechanism of the present invention, the movement restricting portion is formed in an annular protrusion extending toward the speed reduction gear, the inner periphery of the movement restricting portion is brought into contact with the support shaft, and the movement restricting portion A tip portion is brought into sliding contact with the reduction gear.

  The motor with a speed reduction mechanism of the present invention is characterized in that the inner peripheral portion of the drum is brought into sliding contact with the outer peripheral portion of the movement restricting portion.

  In the motor with a reduction mechanism of the present invention, the reduction gear has a large-diameter portion that decelerates rotation of the armature shaft and a small-diameter portion that engages with the drum, and a tip of the support shaft is provided at a tip of the small-diameter portion. A meat stealing portion extending in the axial direction is formed, and a distal end portion of the movement restricting portion is slidably contacted radially inward of the meat stealing portion of the reduction gear.

  In the motor with a speed reduction mechanism of the present invention, the support shaft is formed with a hollow portion, and the drum cover is assembled from the surface opposite to the surface on which the movement restricting portion is formed via the hollow portion of the support shaft. The drum cover and the support shaft are fixed by a fixing screw.

  According to the motor with a speed reduction mechanism of the present invention, a drum around which a drive cable is wound around the outer periphery is assembled to the speed reduction gear so as to be integrally rotatable, and a drum cover is provided that is assembled to a gear case so as to cover the drum. Is provided with a support convex part, and the movement of the reduction gear with respect to the longitudinal direction of the support shaft is regulated by the support convex part via the drum, so that the snap ring, washer, and The mounting groove can be omitted. That is, since the drum cover, which is a component on the driven object side, is used to prevent the reduction gear from coming off from the support shaft, the number of components can be reduced without impairing functionality. Therefore, parts management and a molding process can be simplified, and manufacturing costs can be reduced.

  According to the motor with a speed reduction mechanism of the present invention, the drum cover is formed with a movement restricting portion for restricting the movement of the speed reduction gear with respect to the longitudinal direction of the support shaft in contact with the speed reduction gear. The snap ring, washer, and mounting groove that are required in the above can be omitted.

  According to the motor with a speed reduction mechanism of the present invention, the movement restricting portion is formed in an annular protrusion extending toward the reduction gear, the inner periphery of the movement restricting portion is brought into contact with the support shaft, and the tip of the movement restricting portion is Since the reduction gear is slidably contacted, the sliding contact area between the movement restricting portion and the reduction gear can be reduced. Therefore, an increase in the rotational torque of the reduction gear can be suppressed.

  According to the motor with a speed reduction mechanism of the present invention, since the inner peripheral portion of the drum is brought into sliding contact with the outer peripheral portion of the movement restricting portion, it is possible to suppress shaft misalignment during the rotation of the drum. Therefore, the rotational vibration generated from the drum can be suppressed, and the motor with the speed reduction mechanism can be silenced.

  According to the motor with a reduction mechanism of the present invention, the reduction gear has a large-diameter portion that decelerates the rotation of the armature shaft and a small-diameter portion that engages with the drum, and the tip of the small-diameter portion is in the axial direction of the support shaft. The extending meat stealing portion is formed, and the distal end portion of the movement restricting portion is slidably contacted inward in the radial direction with respect to the meat stealing portion of the speed reduction gear. The sliding contact area with the gear can be further reduced.

  According to the motor with a speed reduction mechanism of the present invention, a hollow portion is formed on the support shaft, and the fixing screw assembled from the surface opposite to the surface on which the movement restricting portion of the drum cover is formed via the support shaft hollow portion. Thus, since the drum cover and the support shaft are fixed, it is possible to suppress rattling in the axial direction with respect to the support shaft of the reduction gear. Therefore, the motor with the speed reduction mechanism can be made more silent.

It is the schematic which shows the power window apparatus carrying the motor with a reduction mechanism which concerns on this invention. It is a fragmentary sectional view explaining the detailed structure of the motor with a deceleration mechanism of FIG. It is sectional drawing which follows the AA line of FIG. It is the elements on larger scale which expand and show the broken-line circle B part of FIG.

  Hereinafter, a motor with a speed reduction mechanism according to an embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a schematic view showing a power window device equipped with a motor with a speed reduction mechanism according to the present invention, FIG. 2 is a partial cross-sectional view for explaining the detailed structure of the motor with a speed reduction mechanism in FIG. 1, and FIG. FIG. 4 is a partial enlarged view showing an enlarged view of a broken-line circle B portion in FIG. 3.

  As shown in FIG. 1, a cable type power window device 11 is mounted on a side door 10 provided on a side surface of a vehicle such as an automobile, and the power window device 11 is provided on a door frame 10 a of the side door 10. The window glass (opening / closing member) 12 is moved up and down (opening / closing drive). The power window device 11 includes a power window motor 20 as a motor with a speed reduction mechanism and a window regulator 60.

  The power window motor 20 includes a motor part 21 and a gear part 22, and the gear part 22 is provided with a drum 23 around which the drive cable 13 is wound. The window regulator 60 includes guide rails 61 extending in the vertical direction of the side door 10, that is, in the opening / closing direction of the window glass 12, and the moving direction of the drive cable 13 is folded back on the upper and lower sides of the guide rail 61 in the drawing. An upper pulley 62 and a lower pulley 63 are rotatably provided.

  The guide rail 61 is slidably provided with a carrier plate 64 that supports the lower end portion of the window glass 12, and the carrier plate 64 has one end of the drive cable 13 folded by the pulleys 62 and 63. The part 13a and the other end part 13b are connected.

  By “opening” an operation switch (not shown) provided in the passenger compartment, the power window motor 20 is driven to rotate in the forward direction, and the drum 23 is rotated in the clockwise direction. As a result, the other end 13b of the drive cable 13 is pulled as shown by the broken line arrow in the figure, and the carrier plate 64 descends along the guide rail 61, and the window glass 12 moves in the direction of the broken line arrow in the figure. Then, the window glass 12 can be opened (OPEN operation).

  On the other hand, when the operation switch is “closed”, the power window motor 20 is driven to rotate in the reverse direction so that the drum 23 rotates in the counterclockwise direction. As a result, the one end portion 13a of the drive cable 13 is pulled as shown by the solid line arrow in the figure, and the carrier plate 64 rises along the guide rail 61. As a result, the window glass 12 moves in the direction of the solid line arrow in the figure. Then, the window glass 12 can be closed (CLOSE operation).

  As shown in FIG. 2, the motor part 21 and the gear part 22 of the power window motor 20 are connected by a plurality of fastening screws 24 (only two are shown in the figure).

  The motor unit 21 includes a bottomed yoke 25 having a substantially oval cross section (not shown in detail), and can be mounted in a narrow space (not shown) inside the side door 10. It is improving. The yoke 25 is formed by deep-drawing (press-molding) a conductive metal plate, and a pair of permanent magnets 26 each having a substantially arc shape are opposed to the inside of the yoke 25. Is provided. A magnetic path (not shown) formed by each permanent magnet 26 passes through the yoke 25. An armature 27 is rotatably provided between the permanent magnets 26 via a predetermined gap, and a coil 28 is wound around the armature 27.

  An amateur shaft 29 is fixed through the rotation center of the amateur 27, and one end side (right side in the figure) of the amateur shaft 29 is rotatably supported by a radial bearing 30 mounted on the bottom of the yoke 25. ing. The other end side (left side in the figure) of the amateur shaft 29 extends to the inside of the gear case 31 of the gear portion 22 and is rotatably supported by a radial bearing 33 provided in the brush holder 32.

  A commutator 34 is integrally provided at a position close to the armature 27 on the gear portion 22 side of the amateur shaft 29. The commutator 34 is formed by collecting a plurality of commutator pieces 34 a having conductivity into a cylindrical shape and molding them. The end of the coil 28 is electrically connected to each commutator piece 34a, and an electromagnetic force is generated in the armature 27 by supplying a drive current to the coil 28 via the commutator 34. The shaft 29 rotates in the forward direction or the reverse direction.

  A brush holder 32 made of a resin material such as plastic is attached to the opening side (left side in the figure) of the yoke 25. The brush holder 32 is provided with a pair of brushes 35 that are movable in the radial direction. Each brush 35 is supplied to the commutator 34 by the elastic force of each spring 36 in order to supply a drive current to the commutator 34. It comes in sliding contact.

  A worm shaft 38 is coupled to the other end side of the amateur shaft 29 via a coupling member 37 so as to be integrally rotatable. A worm 38a is integrally provided on the outer periphery of the worm shaft 38, and a tooth portion 39a of a worm wheel 39 as a reduction gear is engaged with the worm 38a. Here, the worm 38a and the worm wheel 39 constitute a speed reduction mechanism, and the speed reduction mechanism including the worm 38a and the worm wheel 39 reduces the rotation of the armature shaft 29 to a predetermined speed to increase the torque, The rotation with high torque is output from the worm wheel 39.

  The gear case 31 is connected to the yoke 25 and is formed in a bottomed shape with a resin material such as plastic as shown in FIG. A worm accommodating portion 40 is formed inside the gear case 31, and a worm 38 a of the worm shaft 38 is rotatably accommodated in the worm accommodating portion 40. Both end sides of the worm shaft 38 are rotatably supported by being in sliding contact with a pair of radial bearings 41a and 41b (see FIG. 2) mounted on the worm housing 40. Further, the other end side (the left side in FIG. 2) of the worm shaft 38 is supported in the axial direction by a thrust bearing 42 (see FIG. 2) that is also mounted on the worm housing portion 40.

  Inside the gear case 31, a worm wheel housing portion (reduction gear housing portion) 43 is formed in connection with the worm housing portion 40. A worm wheel 39 is rotatably accommodated in the worm wheel accommodating portion 43, and a worm 38 a of the worm shaft 38 is engaged with a tooth portion 39 a of the worm wheel 39. Thereby, the rotation of the worm shaft 38, that is, the rotation of the armature shaft 29 is transmitted to the worm wheel 39.

  A support shaft 45 set to a length longer than the depth of the worm wheel housing portion 43 is integrally provided at the center of the bottom surface portion 44 of the worm wheel housing portion 43. The wheel 39 extends in the axial direction and protrudes to the outside of the gear case 31. The support shaft 45 is formed simultaneously with the gear case 31 when the gear case 31 is formed. The support shaft 45 has a large-diameter cylindrical portion 45a and a small-diameter cylindrical portion 45b from the bottom surface portion 44 side, and each cylindrical portion 45a, 45b is supported by a through hole 39b formed in the worm wheel 39. The worm wheel 39 is rotatably supported.

  Each cylindrical part 45a, 45b is provided with a plurality of hollow parts 46a, 46b and 46c. By providing the hollow portions 46a, 46b and 46c, the gear case 31 is reduced in weight, and in addition to this, the occurrence of distortion (sink) in the cylindrical portions 45a and 45b after the gear case 31 is molded is suppressed.

  An annular support convex portion 47 is provided on the bottom surface portion 44 so as to extend in the same direction as the protruding direction of the support shaft 45. The support convex portion 47 is configured to slidably support the worm wheel 39 accommodated in the worm wheel housing portion 43 so as to face the bottom surface portion 44, and the power projection motor 20 is supported on the support convex portion 47. A predetermined amount of sliding grease (not shown) is applied during assembly. Thereby, smooth sliding with respect to the gear case 31 of the worm wheel 39 is possible.

  The worm wheel 39 has a large diameter portion 48, a medium diameter portion 49 and a small diameter portion 50. The large diameter portion 48 is supported by the large diameter cylindrical portion 45 a of the support shaft 45 so as to decelerate the rotation of the armature shaft 29. The medium diameter portion 49 and the small diameter portion 50 are supported by the small diameter cylindrical portion 45 b of the support shaft 45. A portion of the support shaft 45 where the large-diameter cylindrical portion 45a and the small-diameter cylindrical portion 45b are switched, that is, between the inner diameter of the intermediate diameter portion 49 of the worm wheel 39 and the small-diameter cylindrical portion 45b of the support shaft 45 is an O made of a rubber material. A ring (seal member) 51 is attached. The O-ring 51 seals between the worm wheel 39 and the support shaft 45, and prevents foreign matters such as rain water from entering the gear case 31 through the space between the worm wheel 39 and the support shaft 45.

  A serration portion 50a having a plurality of irregularities is integrally formed on the outer peripheral portion of the small diameter portion 50 so as to extend in the axial direction of the small diameter portion 50 (see FIG. 2). The drum 23 is mounted on the serration portion 50a, and the serration portion 50a prevents idling of the small diameter portion 50 of the drum 23. Thereby, the drum 23 can rotate integrally with the worm wheel 39.

  A meat stealing portion 50b is provided at the tip of the small diameter portion 50 so as to extend in the axial direction of the support shaft 45, and this meat stealing portion 50b is arranged in the circumferential direction of the worm wheel 39 as shown in FIG. Six points are provided at substantially equal intervals. Each meat stealing portion 50b reduces the weight of the worm wheel 39 and increases the adhesion strength (mounting strength) of the drum 23 to the small diameter portion 50 by giving the small diameter portion 50 flexibility.

  An annular annular seal 52 is attached to the outer peripheral surface of the medium diameter portion 49, and the annular seal 52 is supported by an annular base member 53. The annular seal 52 is attached to the gear case 31 by fitting the base member 53 to the gear case 31. The inner peripheral surface of the annular seal 52 is provided with a lip portion 52a that is in sliding contact with the outer peripheral surface of the medium diameter portion 49, thereby ensuring sufficient sealing performance while suppressing an increase in rotational resistance of the worm wheel 39.

  The drum 23 assembled and engaged with the small diameter portion 50 (the serration portion 50a) of the worm wheel 39 so as to be integrally rotatable is covered with a drum cover 54 formed in a bottomed shape by a resin material such as plastic. . As shown in FIGS. 2 and 3, the drum cover 54 is integrally provided with three case mounting holes 54a, and mounting bolts 55 pass through the case mounting holes 54a. Three attachment nuts 31a are attached to the gear case 31 so as to correspond to the case attachment holes 54a, and the drum cover 54 is assembled to the gear case 31 by screwing each attachment bolt 55 to each attachment nut 31a. ing.

  The drum cover 54 is further provided with three mounting legs 54b integrally, and a fixing bolt 56 passes through each of the mounting legs 54b. Then, by fixing the fixing bolt 56 to the panel nut 10c of the door panel 10b provided inside the side door 10, the power window motor 20 is mounted on the door panel 10b, that is, the vehicle body.

  The drum cover 54 is formed with a drum housing portion 57 that rotatably covers the drum 23. A cylindrical portion 57 a as a movement restricting portion of the worm wheel 39 is provided in the gear case 31 at a substantially central portion of the drum housing portion 57. Are integrally provided in a protruding shape toward the worm wheel 39 at a position concentric with the support shaft 45. The cylindrical portion 57a is formed in an annular shape. The distal end portion (upper side in the drawing) of the small-diameter cylindrical portion 45b of the support shaft 45 is in contact with and fitted to the inside of the cylindrical portion 57a in the radial direction, thereby suppressing the axial displacement of the support shaft 45. I have to.

  The distal end portion (lower side in the figure) of the cylindrical portion 57a is disposed so as to contact the inner side in the radial direction with respect to each meat stealing portion 50b in the small diameter portion 50 of the worm wheel 39. The worm wheel 39 is configured such that the tip portion (upper side in the drawing) of the small diameter portion 50 is in sliding contact. In this way, by disposing the distal end portion of the cylindrical portion 57a on the radially inner side of each meat stealing portion 50b of the small diameter portion 50, the sliding contact area at the contact portion CP1 shown in FIG. 4 can be reduced. The increase in the rotational resistance of the worm wheel 39 due to the cylindrical portion 57a is minimized.

  A bolt hole 54c is provided on the bottom side of the cylindrical portion 57a, and a fixing bolt (fixing screw) 58 passes through the bolt hole 54c. Then, the drum cover 54 and the support shaft 45 are fixed by screwing the fixing bolt 58 from the surface opposite to the surface where the cylindrical portion 57a of the drum cover 54 is formed to the hollow portion 46c of the small diameter cylindrical portion 45b. Like to do. Thus, the worm wheel 39 is sandwiched between the large-diameter cylindrical portion 45a and the cylindrical portion 57a of the support shaft 45, and the movement of the support shaft 45 in the longitudinal direction is restricted by the cylindrical portion 57a.

  Here, as shown in FIG. 4, by adjusting the screwing amount of the fixing bolt 58 into the small diameter cylindrical portion 45b, the pressing force F applied to the small diameter portion 50 by the cylindrical portion 57a can be adjusted. The magnitude of the pressing force F by the fixing bolt 58 is adjusted so as not to increase the rotational resistance of the worm wheel 39 and to suppress the rattling of the worm wheel 39 in the axial direction.

  When the drum cover 54 is formed of a member having sufficient strength, the fixing bolt 58 can be omitted. That is, the worm wheel 39 can be clamped between the large-diameter cylindrical portion 45a and the cylindrical portion 57a only by the cylindrical portion 57a regardless of the fixing bolt 58, and the axial movement of the worm wheel 39 can be restricted. it can.

  Further, as shown in FIG. 3, an annular support convex portion 59 is integrally provided around the cylindrical portion 57a of the drum cover 54 so as to extend in the same direction as the protruding direction of the cylindrical portion 57a. The support convex portion 59 is configured to support the drum 23 with the middle diameter portion 49 of the worm wheel 39. Therefore, the movement of the worm wheel 39 in the longitudinal direction of the support shaft 45 is restricted by the annular support convex portion 59 via the drum 23. Note that a predetermined amount of sliding grease (not shown) is applied to the support convex portion 59 when the power window motor 20 is assembled. As a result, the drum 23 can smoothly slide with respect to the drum cover 54.

  The drum 23 is formed in a substantially cylindrical shape by a resin material such as plastic, and a cable groove 23a around which the drive cable 13 is wound is provided on the outer peripheral portion thereof. The cable groove 23a is formed in a spiral shape with a relatively short pitch along the axial direction of the drum 23, and a plurality of drive cables 13 are provided in the cable groove 23a in a state where the power window motor 20 is assembled. It is wound around (for example, 5 times). Both ends of the drive cable 13 are drawn out from a pair of drawing holes (not shown) formed in the drum cover 54 toward the pulleys 62 and 63 (see FIG. 1).

  A serration mounting portion 23b to be mounted on the serration portion 50a is formed on the inner side in the radial direction of the drum 23. On the opposite side of the serration mounting portion 23b to the worm wheel 39 side, on the inner side in the radial direction of the drum 23. An annular protrusion 23c that protrudes toward the surface is integrally provided. The radially inner side of the annular protrusion 23c constitutes the inner peripheral portion of the drum according to the present invention, and is in sliding contact with the outer peripheral portion of the cylindrical portion 57a as shown by a contact portion CP2 in FIG. A predetermined amount of sliding grease (not shown) is applied to the radially inner side of the annular protrusion 23c when the power window motor 20 is assembled. Thereby, smooth sliding with respect to the cylindrical part 57a of the drum 23 is possible.

  Next, the operation of the power window motor 20 configured as described above will be described in detail with reference to FIG.

  When the power window motor 20 is rotationally driven by operating the operation switch, the worm shaft 38 rotates through the connecting member 37 as the armature 27 and the armature shaft 29 rotate. Then, while the worm wheel 39 meshing with the worm 38a is decelerated, the worm wheel 39 is rotated about the rotation axis C, and the drum 23 is rotated in the direction of the arrow R (clockwise / counterclockwise) with high output. . Then, the windshield 12 moves up and down (opens and closes) as the drum 23 winds and feeds the drive cable 13.

  At this time, the reaction force caused by the weight of the windshield 12 is transmitted to the drum 23 via the drive cable 13, but the annular protrusion 23c of the drum 23 is in sliding contact with the outer peripheral portion of the cylindrical portion 57a. The axial displacement of the drum 23 is suppressed. Further, when the operation time of the power window motor 20 becomes long and the backlash of the worm wheel 39 with respect to the axial direction of the support shaft 45 occurs, the fixing bolt 58 is tightened further. The rattling of the wheel 39 with respect to the axial direction of the support shaft 45 can be suppressed again. By tightening the fixing bolt 58, rattling with respect to the axial direction of the support shaft 45 of the worm wheel 39 can be easily suppressed, so that wear of other components (such as the O-ring 51) can be suppressed.

  As described above in detail, according to the power window motor 20 according to the present embodiment, the drum 23 around which the drive cable 13 is wound is assembled to the worm wheel 39 so as to be integrally rotatable, and the drum 23 is covered. A drum cover 54 to be assembled to the gear case 31 is provided, and the drum cover 54 is provided with an annular support convex portion 59, and the movement of the worm wheel 39 in the longitudinal direction of the support shaft 45 is annular via the drum 23. Therefore, the snap ring, the washer, and the mounting groove required in the conventional motor with the speed reduction mechanism can be omitted. In addition, since the drum cover 54 is formed with the cylindrical portion 57a that restricts the movement of the worm wheel 39 with respect to the longitudinal direction of the support shaft 45 in contact with the worm wheel 39, the same effect as described above can be obtained. That is, in the power window motor 20, since the drum cover 54, which is a part on the normal window regulator side, is used to prevent the worm wheel 39 from coming off from the support shaft 45, the number of parts is reduced without impairing functionality. be able to. Therefore, parts management and a molding process can be simplified, and manufacturing costs can be reduced.

  Further, according to the power window motor 20 according to the present embodiment, the cylindrical portion 57a is formed in an annular protrusion extending toward the worm wheel 39, and the inner periphery of the cylindrical portion 57a is in contact with the support shaft 45. Since the tip of the cylindrical portion 57a is brought into sliding contact with the tip of the small diameter portion 50 of the worm wheel 39, the sliding contact area between the cylindrical portion 57a and the worm wheel 39 can be reduced. Therefore, an increase in rotational torque of the worm wheel 39 can be suppressed.

  Furthermore, according to the power window motor 20 according to the present embodiment, since the annular protrusion 23c of the drum 23 is brought into sliding contact with the outer peripheral portion of the cylindrical portion 57a, it is possible to suppress the axial displacement when the drum 23 rotates. it can. Therefore, the rotational vibration generated from the drum 23 can be suppressed, and the noise of the power window motor 20 can be reduced.

  Further, according to the power window motor 20 according to the present embodiment, the worm wheel 39 has the large-diameter portion 48 that decelerates the rotation of the armature shaft 29 and the small-diameter portion 50 that engages with the drum 23. 50, a meat stealing portion 50b extending in the axial direction of the support shaft 45 is formed, and the tip portion of the cylindrical portion 57a is in sliding contact with the meat stealing portion 50b of the worm wheel 39 inward in the radial direction. Can be reduced, and the sliding contact area between the cylindrical portion 57a and the small diameter portion 50 can be further reduced.

  Furthermore, according to the power window motor 20 according to the present embodiment, the support shaft 45 is formed with the hollow portion 46c, and the support shaft 45 is formed from the surface opposite to the surface on which the cylindrical portion 57a of the drum cover 54 is formed. Since the drum cover 54 and the support shaft 45 are fixed by the fixing bolt 58 assembled through the hollow portion 46c, the rattling of the worm wheel 39 with respect to the support shaft 45 in the axial direction can be suppressed. Therefore, the power window motor 20 can be made more silent.

  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 worm wheel 39 as a reduction gear is formed by integrating the large diameter portion 48, the medium diameter portion 49, and the small diameter portion 50. However, the present invention is not limited to this. The worm wheel is divided into two parts that can be rotated relative to each other, the worm 38a is engaged with one part, and the drum 23 is provided so as to be integrally rotatable with the other part. A member (damper member) can also be mounted. In this case, since the input of impact load to the gear teeth such as the worm 38a can be suppressed, the power window motor 20 can be further silenced, and the gear teeth can be prevented from being chipped. .

  Moreover, in the said embodiment, although the thing used as the cylindrical part 57a extended in a projection form from the drum cover 54 was shown as a movement control part in this invention, this invention is not restricted to this, The cylindrical part 57a is shown. It can be abolished and a flat movement restricting portion can be provided at the bottom of the drum cover 54. In this case, the small diameter portion 50 of the worm wheel 39 may be protruded with a long length toward the bottom of the drum cover 54 so as to be in sliding contact with the flat movement restricting portion.

  Furthermore, in the above-described embodiment, the armature shaft 29 and the worm shaft 38 are divided and connected to each other by the connecting member 37 so as to be integrally rotatable. However, the present invention is not limited to this, and the armature shaft is not limited thereto. May be set to a long length, and the worm may be integrally formed on the tip side. That is, an amateur shaft having a worm integrated structure can be used.

  Moreover, in the said embodiment, although what applied the motor with a deceleration mechanism to the power window motor 20 of the power window apparatus 11 which raises / lowers the window glass 12 of a vehicle was shown, this invention is not restricted to this, A vehicle The present invention can also be applied to a drive source such as an electric sunroof device or a sliding door device mounted on the vehicle.

DESCRIPTION OF SYMBOLS 10 Side door 10a Door frame 10b Door panel 10c Panel nut 11 Power window apparatus 12 Window glass (opening-closing member)
13 drive cable 13a one side end 13b other side end 20 power window motor (motor with speed reduction mechanism)
21 Motor part 22 Gear part 23 Drum 23a Cable groove 23b Serration mounting part 23c Annular protrusion (inner part of drum)
24 fastening screw 25 yoke 26 permanent magnet 27 amateur 28 coil 29 amateur shaft 30 radial bearing 31 gear case 31a mounting nut 32 brush holder 33 radial bearing 34 commutator 34a commutator piece 35 brush 36 spring 37 connecting member 38 worm shaft 38a worm 39 worm Wheel (reduction gear)
39a tooth part 39b through-hole 40 worm accommodating part 41a, 41b radial bearing 42 thrust bearing 43 worm wheel accommodating part (reduction gear accommodating part)
44 Bottom portion 45 Support shaft 45a Large diameter cylindrical portion 45b Small diameter cylindrical portion 46a to 46c Hollow portion 47 Support convex portion 48 Large diameter portion 49 Medium diameter portion 50 Small diameter portion 50a Serration portion 50b Meat stealing portion 51 O-ring (seal member)
52 annular seal 52a lip portion 53 base member 54 drum cover 54a case mounting hole 54b mounting leg portion 54c bolt hole 55 mounting bolt 56 fixing bolt 57 drum accommodating portion 57a cylindrical portion (movement restricting portion)
58 Fixing bolt (fixing screw)
59 Supporting convex part 60 Window regulator (driven object)
61 Guide rail 62 Upper pulley 63 Lower pulley 64 Carrier plate CP1, CP2 Contact part F Pressing force

Claims (6)

A yoke that rotatably accommodates the amateur shaft,
A reduction gear for reducing the rotation of the armature shaft;
A reduction gear receiving portion for receiving the reduction gear, a support shaft that protrudes from the center of the reduction gear receiving portion and rotatably supports the reduction gear, and is connected to the yoke;
A drum that is assembled so as to be integrally rotatable with the reduction gear and in which a cable groove for winding a drive cable for opening and closing the opening and closing member is wound around the outer periphery;
A drum cover having a case mounting hole for mounting to the gear case and a mounting leg for mounting to the vehicle body, and arranged to cover the drum;
A motor with a speed reduction mechanism,
The drum cover is provided with a support protrusion, and the reduction gear is restricted by the support protrusion through the drum from moving in the longitudinal direction of the support shaft. With motor.   The motor with a speed reduction mechanism according to claim 1, wherein the drum cover is formed with a movement restricting portion that contacts and restricts the movement of the speed reduction gear in the longitudinal direction of the support shaft. A motor with a speed reduction mechanism.   3. The motor with a speed reduction mechanism according to claim 2, wherein the movement restricting portion is formed in an annular protrusion extending toward the reduction gear, and an inner periphery of the movement restricting portion is brought into contact with the support shaft, and the movement restricting portion is formed. A motor with a speed reduction mechanism, wherein the front end portion of the portion is brought into sliding contact with the speed reduction gear.   4. The motor with a speed reduction mechanism according to claim 3, wherein the inner peripheral portion of the drum is brought into sliding contact with the outer peripheral portion of the movement restricting portion.   5. The motor with a speed reduction mechanism according to claim 3, wherein the reduction gear includes a large-diameter portion that decelerates rotation of the armature shaft, and a small-diameter portion that engages with the drum. A motor with a speed reduction mechanism, characterized in that a meat stealing portion extending in the axial direction of the support shaft is formed, and a distal end portion of the movement restricting portion is slidably contacted radially inward with respect to the meat stealing portion of the reduction gear. .   The motor with a speed reduction mechanism according to any one of claims 2 to 5, wherein a hollow portion is formed on the support shaft, and the support from a surface opposite to a surface on which the movement restricting portion of the drum cover is formed. A motor with a speed reduction mechanism, wherein the drum cover and the support shaft are fixed by a fixing screw assembled through the hollow portion of the shaft.

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