JP2010124621A - Motor with decelerator mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the looseness of a connection member between an armature shaft and a worm shaft in the axial direction. <P>SOLUTION: Three presser projections 73f, which press an armature shaft 24 and a worm shaft 43 in an axial direction for separation, are provided between an armature shaft side connection member 60 provided to one end side of the armature shaft 24 and a worm shaft side connection member 70 provided to the other end side of the worm shaft 43. The connection members 60 and 70 can be provided between the armature shaft 24 and the worm shaft 43 in such condition as elastic forces F (reaction force f) of presser projections 73f cause the separation of them. Thus, the connection members 60 and 70 can be provided with no looseness relative to the armature shaft 24 and the worm shaft 43, preventing occurrence of noises and early degradation of connection members 60 and 70. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor with a speed reduction mechanism provided with a speed reduction mechanism that reduces the rotation of a motor unit.

  2. Description of the Related Art Conventionally, as a drive source in a power window device, a sunroof device, or the like mounted on a vehicle such as an automobile, a motor with a speed reduction mechanism that can obtain a large output while being small is used. The motor with a speed reduction mechanism is rotationally driven by an operator operating an operation switch provided in the vehicle interior and the like, and thereby opens and closes an opening / closing body (window glass, sunroof, etc.).

  In-vehicle motors with a reduction mechanism are required to be downsized because they are installed in limited spaces such as the doors and ceilings of vehicles. Regardless, the layout can be improved. Therefore, in order to further reduce the size of the motor with a speed reduction mechanism, the motor unit and the gear unit are separately designed as separate units.

  For example, a small-diameter armature shaft with rigidity that can withstand a predetermined output is used in the motor section, and a worm shaft that has rigidity that can withstand a large reduction ratio in the gear section and has a larger diameter than the amateur shaft. By adopting a design such as adoption, each of the motor unit and the gear unit can be reduced in size, and thus the motor with a speed reduction mechanism can be further reduced in size.

  As a motor with a speed reduction mechanism in which a motor unit and a gear unit are separated, for example, a technique described in Patent Document 1 is known. The motor (motor with a speed reduction mechanism) described in Patent Document 1 has a motor body (motor part) and a speed reduction part (gear part), and is formed by fixing both with a plurality of screws. . The motor body includes a small-diameter rotating shaft (an amateur shaft), and the speed reduction unit includes a worm shaft having a diameter larger than that of the rotating shaft and a worm wheel rotated by the worm shaft. The rotating shaft and the worm shaft include a clutch. Are connected to each other so as to be able to transmit power to each other.

The clutch includes a driving-side rotating body (an amateur shaft-side connecting member) provided so as to be integrally rotatable at a connecting portion of the rotating shaft, and a driven-side rotating body (worm shaft) integrally formed with the worm shaft and connected to the driving-side rotating body. Side connecting member).
Japanese Patent No. 3993010 (FIG. 2)

  However, according to the motor with the speed reduction mechanism described in Patent Document 1 described above, the drive rotator is loosely fitted to the connecting portion of the rotation shaft, and the drive rotator is connected to the driven rotator from the axial direction. Thereby, each rotary body can be rotated integrally. Therefore, the drive rotator can move in the axial direction with respect to the rotation shaft, and the drive rotator moves in the axial direction with respect to the rotation shaft during the operation of the motor with the speed reduction mechanism. Or the sliding contact portion with the connecting portion of the drive rotating body may be unevenly worn and deteriorated at an early stage.

  An object of the present invention is to provide a motor with a speed reduction mechanism that can eliminate backlash in the axial direction of a connecting member between an amateur shaft and a worm shaft.

  A motor with a speed reduction mechanism according to the present invention includes a motor case formed of a metal in a bottomed cylindrical shape, an armature shaft having the other end pivotally supported by the motor case and rotatably provided on the motor case, and the armature shaft An armature shaft side connecting member provided on one end side of the armature so as to be rotatable integrally with the armature shaft, a gear case connected to the motor case, and a worm shaft rotatably supported on the gear case. And a worm shaft side coupling member provided on the other end side of the worm shaft so as to be rotatable integrally with the worm shaft and coupled to the armature shaft side coupling member so as to be integrally rotatable. The armature shaft side connecting member and the worm shaft side connecting member are provided between the armature shaft and the worm shaft in an axial direction. Characterized in that it comprises an elastic member for pressing a direction spaced.

  In the motor with a speed reduction mechanism of the present invention, the armature shaft side connecting member is press-fitted and fixed to one end side of the armature shaft, and the worm shaft side connecting member is swingably connected to the other end side of the worm shaft. It is characterized by.

  In the motor with a speed reduction mechanism according to the present invention, at least one of the armature shaft side connecting member and the worm shaft side connecting member holds the connection state of the armature shaft side connecting member and the worm shaft side connecting member. A connection holding member is provided.

  The motor with a speed reduction mechanism of the present invention is characterized in that a thrust adjusting member for adjusting backlash in the axial direction of the armature shaft and the worm shaft is provided on one end side of the worm shaft in the gear case.

  According to the present invention, the armature shaft and the worm shaft are axially disposed between the armature shaft side connecting member provided on one end side of the armature shaft and the worm shaft side connecting member provided on the other end side of the worm shaft. Since an elastic member that presses in the separating direction is provided, the connecting members are separated from each other by the elastic force of the elastic member, that is, between the armature shaft and the worm shaft in a state of stretching in the separating direction. Can be provided. Therefore, it is possible to provide each connecting member with respect to the amateur shaft and the worm shaft without rattling, and as a result, it is possible to prevent the generation of abnormal noise and the early deterioration of each connecting member.

  According to the present invention, the armature shaft side connecting member is press-fitted and fixed to one end side of the armature shaft, and the worm shaft side connecting member is swingably connected to the other end side of the worm shaft. The motor with a speed reduction mechanism can be smoothly rotated by allowing eccentricity (axial deviation).

  According to the present invention, at least one of the armature shaft side connecting member and the worm shaft side connecting member is provided with the connection holding member that holds the connection state between the armature shaft side connecting member and the worm shaft side connecting member. Therefore, the motor with the speed reduction mechanism can be assembled under the state where the armature side coupling member and the worm shaft side coupling member are coupled, and the motor with the speed reduction mechanism can be efficiently assembled.

  According to the present invention, the thrust adjustment member for adjusting the backlash in the axial direction of the armature shaft and the worm shaft is provided on one end side of the worm shaft in the gear case, thereby suppressing variation in the elastic force of the elastic member for each product. can do.

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

  1 is a partial sectional view of a motor with a speed reduction mechanism according to the present invention, FIG. 2 is a perspective view showing an armature, a connecting member, and a worm shaft of the motor with a speed reduction mechanism in FIG. 1, and FIG. 4 is an enlarged sectional view taken along line AA in FIG. 1, FIG. 5 is a perspective view showing a worm shaft and a pair of bearing members, and FIG. 6 is viewed from the direction of arrow C in FIG. 7 is a perspective view of the connecting member, FIG. 7 is a perspective view of the connecting member viewed from the direction of arrow D in FIG. 2, FIG. 8 is an exploded perspective view showing the connecting member in an exploded manner, and FIGS. FIG. 10B is a perspective view illustrating the insert-molded rigid member, and FIGS. 10A and 10B are perspective views illustrating the injection-molded cushion member.

  As shown in FIG. 1, a motor 10 with a speed reduction mechanism is used as a drive source of a power window device (not shown) mounted on a vehicle such as an automobile, and includes a wind regulator (not shown) that raises and lowers the wind glass. To drive. Since the motor 10 with a speed reduction mechanism is installed in a narrow space (not shown) formed in the door of the vehicle, it has a shape in which the thickness dimension along the depth direction in the figure is suppressed from the front side in the figure. Yes. The motor 10 with a speed reduction mechanism includes a motor unit 20 and a gear unit 40, and the motor unit 20 and the gear unit 40 are integrated (unitized) by a plurality of fastening screws 11.

  The motor unit 20 includes a yoke (motor case) 21 formed into a bottomed cylindrical shape by pressing (deep drawing) a steel plate made of a magnetic material (metal). A pair of magnets 22 is disposed inside the yoke 21 so as to face each other, and an armature 23 around which a coil (not shown) is wound is rotatably provided inside each magnet 22.

  An amateur shaft 24 is fixed through the rotation center of the amateur 23, and a commutator 25 is provided at a portion of the amateur shaft 24 adjacent to the amateur 23. The end of the coil wound around the armature 23 is electrically connected to the commutator 25, and a pair of brushes 27 held by the brush holder 26 come into sliding contact with the outer periphery of the commutator 25. ing. Each brush 27 is pressed against the commutator 25 by a spring member 28 at a predetermined pressure. Thereby, a driving current is supplied to each brush 27 from a controller (not shown), thereby rotating the armature 23 (electromagnetic force). The armature shaft 24 rotates at a predetermined rotational speed and rotational torque.

  The bottom side (the left side in the figure) of the yoke 21 is formed in a stepped shape, and the bottomed cylinder portion 21 a having a smaller diameter than the main body portion of the yoke 21 is provided in the portion. A first radial bearing 29 is attached to the bottomed cylindrical portion 21a, and the first radial bearing 29 rotatably supports the other axial end side (left side in the figure) of the armature shaft 24. A first thrust bearing 30 is disposed on the bottom side of the bottomed cylindrical portion 21a, and a first steel ball is disposed between the first thrust bearing 30 and the other axial end side of the armature shaft 24. A (steel ball) 31 is provided. As a result, the other end of the armature shaft 24 is pivotally supported by the yoke 21 and is provided rotatably on the yoke 21.

  A second radial bearing 32 is attached to the brush holder 26, and the second radial bearing 32 rotatably supports one end side (right side in the drawing) of the armature shaft 24. As described above, the first radial bearing 29, the first thrust bearing 30 and the first steel ball 31 are provided on the other axial end side of the armature shaft 24, and the second radial bearing is provided on the one axial end side of the armature shaft 24. By providing the bearing 32, the armature shaft 24, that is, the armature 23 can be smoothly rotated with almost no rotational resistance.

  At one axial end of the amateur shaft 24, as shown in FIG. 3, there is a two-sided portion 24a having a pair of flat surfaces (only the front side is shown in the drawing) facing the radial direction of the amateur shaft 24. Is provided. An armature shaft side connecting member 60 forming the connecting member 50 is fixed to the two-way portion 24a.

  As shown in FIG. 1, the gear unit 40 includes a gear case 41 and a connector member 42 attached to the gear case 41. The gear case 41 is formed into a predetermined shape by injection molding a resin material such as plastic, and the gear case 41 is connected to the opening of the yoke 21 via a connector member 42. Inside the gear case 41, a worm shaft 43 having a worm portion 43a (not shown in detail) integrally formed on the outer peripheral portion and a worm wheel 44 having gear teeth (not shown) meshing with the worm portion 43a are rotatable. Is housed in.

  As shown in FIG. 2, the worm shaft 43 is provided coaxially with the armature shaft 24, and the other axial end of the worm shaft 43 can be integrally rotated via a connecting member 50 on one axial end of the armature shaft 24. It is connected to. A second thrust bearing 45 provided in the gear case 41 is disposed on one end side of the worm shaft 43 in the axial direction, and between the second thrust bearing 45 and one end side of the worm shaft 43 in the axial direction. A second steel ball 46 is provided. Thus, one end of the worm shaft 43 is pivotally supported on the gear case 41 and is rotatably provided on the gear case 41. Here, the second thrust bearing 45 and the second steel ball 46 rotate the worm shaft 43 smoothly.

  On the opposite side of the gear case 41 from the yoke 21 side, as shown in FIG. 4, a filling portion 41a filled with the resin material 12 as a thrust adjusting member, and the resin material 12 is applied to the filling portion 41a from the outside of the gear case 41. An opening 41b for filling, and a communication hole 41c that connects the filling portion 41a and the opening 41b are formed. Then, after assembling the motor 10 with the speed reduction mechanism, the molten resin material 12 is filled into the filling portion 41a from the opening 41b through the communication hole 41c with a predetermined pressure, whereby the second thrust bearing 45 is attached to the armature shaft 24. Further, the worm shaft 43 is moved toward the other end side in the axial direction, thereby eliminating backlash in the axial direction of the armature shaft 24 and the worm shaft 43. However, the thrust adjustment member is not limited to filling the resin material 12 in the filling portion 41a, and an adjustment bolt (not shown) screwed to the gear case 41 is used, and the adjustment bolt is screwed into the gear case 41. By adjusting the amount, backlash in the axial direction of the armature shaft 24 and the worm shaft 43 may be eliminated.

  As shown in FIG. 5, on both ends in the axial direction of the worm portion 43a provided on the worm shaft 43, a first object having a diameter smaller than that of the worm portion 43a (9.0 mm to 9.5 mm) is set. A holding portion 43b and a second held portion 43c are provided. The diameter dimension of the first held portion 43b is set to 5.0 mm to 5.5 mm, the diameter size of the second held portion 43c is set to 7.0 mm to 7.5 mm, and each held portion 43b, 43c The third radial bearing 47 and the fourth radial bearing 48 provided in the gear case 41 are respectively held rotatably.

  The sliding area between the first held portion 43b and the third radial bearing 47 is set by setting the diameter dimensions of the held portions 43b and 43c to substantially the same diameter size (diameter size difference of 2.0 mm or less). The difference in sliding area between the second held portion 43c and the fourth radial bearing 48 is reduced.

  A serration portion 43d is integrally provided on the other axial end side of the worm shaft 43, and the serration portion 43d is loosely fitted to the worm shaft side connecting member 70 forming the connecting member 50. . The outer peripheral side of the serration portion 43d has a plurality of (9 in the figure) irregularities along the circumferential direction of the worm shaft 43 and is formed in a substantially gear tooth shape. A concave portion 43e having a shape is formed. A third steel ball 80 forming the connecting member 50 enters the recess 43e and comes into line contact therewith.

  As shown in FIG. 1, a pinion 44a as an output shaft is provided at the rotation center of the worm wheel 44 so as to be integrally rotatable, and a gear (not shown) forming a window regulator meshes with the pinion 44a. It is like that. Then, the rotation of the motor unit 20, that is, the rotation of the worm shaft 43 accompanying the rotation of the armature shaft 24 is decelerated by the worm wheel 44 so that the high torque output is transmitted from the pinion 44a to the gear of the window regulator. It has become. Here, the worm shaft 43 and the worm wheel 44 constitute a reduction mechanism (reduction gear).

  A connecting member 50 is provided between one end side of the amateur shaft 24 in the axial direction and the other end side of the worm shaft 43 so as to be integrally rotatable. As shown in FIG. 3, the connecting member 50 includes an armature shaft side connecting member 60, a worm shaft side connecting member 70, and a third steel ball 80.

  As shown in FIG. 6, the amateur shaft side connecting member 60 is formed in a predetermined shape by pressing (punching) a steel material, and extends radially from the main body 61 and the central portion of the main body 61. And two protrusions 62. A substantially rectangular fixing hole 63 is provided at the center of the main body 61, and the two-way portion 24 a of the armature shaft 24 is press-fitted into the fixing hole 63 and fixed. Therefore, the armature shaft side connecting member 60 is firmly fixed to the armature shaft 24 without rattling, and rotates integrally with the armature shaft 24. The protrusions 62 are provided at regular intervals (120 ° intervals) along the circumferential direction of the main body 61 and are formed in a substantially fan shape. A side wall surface 64 and another side wall surface 65 are formed on the side portions of each protrusion 62 along the circumferential direction so as to face each other.

  As shown in FIGS. 7 and 8, the worm shaft side connecting member 70 includes a main body 71, a rigid member 72, and a cushion member 73. The main body 71 is formed in a substantially bottomed shape, and on the bottom side of the main body 71, as shown in FIG. 6, three protrusions 71 a that protrude toward the other end in the axial direction are provided. The protrusions 71a are provided at regular intervals (120 ° intervals) along the circumferential direction of the main body 71 and are formed in a substantially fan shape. One side wall surface 71b and another side wall surface 71c are formed so as to face each other along the circumferential direction of each protrusion 71a. Between the protrusions 71a along the circumferential direction, the protrusions 62 of the armature shaft side connecting member 60 are inserted and connected, and one side wall surface 64 and the other side wall surface 65 of each protrusion 62 are , Respectively opposite the other side wall surface 71c and the one side wall surface 71b of each protrusion 71a. Thereby, the worm shaft side connecting member 70 rotates with the rotation of the armature shaft side connecting member 60.

  As shown in FIG. 3, a spherical portion 71d is formed on the bottom of the main body 71. The radius of curvature of the spherical portion 71d is set to be substantially the same value as the radius of curvature of the third steel ball 80, and the third steel ball 80 comes into slidable contact with the spherical portion 71d. Yes. Here, the third steel ball 80 is provided between the armature shaft 24 and the worm shaft 43, and the third steel ball 80 includes one end side in the axial direction of the armature shaft 24 and the spherical surface portion 71 d of the main body portion 71. And the recessed part 43e of the worm shaft 43 is contacting, respectively.

  As shown in FIG. 7, a plurality of (six in the drawing) protrusions 71 e are provided on the opening side of the main body 71, and each protrusion 71 e is arranged around the periphery of the main body 71. It is provided at equal intervals (60 ° intervals) along the direction, and is formed in a substantially cylindrical shape. An attachment ring 91 of a sensor magnet 90 provided on the outer periphery of the main body 71, that is, the outer periphery of the worm shaft side connecting member 70, is attached to each protrusion 71e.

  The sensor magnet 90 is formed of a bonded magnet or the like in which magnet powder is bonded with a binder such as resin, and is integrally provided on the outer periphery of a metal mounting ring 91. The sensor magnet 90 is magnetized so that a plurality of magnetic poles (not shown) are alternately arranged at predetermined intervals along the circumferential direction, such as N pole, S pole, N pole, S pole,. ing.

  A concave / convex hole 71f having a plurality of concave / convex portions is formed along the circumferential direction inside the main body 71, and the inner shape of the concave / convex hole 71f is the outer shape of the serration portion 43d provided in the worm shaft 43. Are formed in the same shape (similar shape). The serration portion 43d is loosely fitted in the concave and convex hole 71f through a minute gap, whereby the worm shaft side connecting member 70 can be eccentric and tiltable (swingable) with respect to the worm shaft 43. ) And can be rotated together. The minute gap between the concave / convex hole 71f and the serration portion 43d allows an axial shift between the worm shaft side connecting member 70 and the worm shaft 43 when the motor 10 with the speed reduction mechanism is assembled. .

  As shown in the shaded portion in FIG. 9, a rigid member 72 is provided in the inside of the main body 71 near the opening side by insert molding. The rigid member 72 is formed into a predetermined shape (see FIG. 8) by pressing a steel plate or the like, and serves to reinforce the main body 71. The inner shape of the rigid member 72 is the same as the concave and convex hole 71f of the main body 71, and the serration portion 43d is loosely fitted inside the rigid member 72 through a minute gap, like the main body 71. It has become.

  As shown in the shaded portion in FIG. 10, the main body 71 is provided with a cushion member 73 along the axial direction by injection molding. The cushion member 73 is formed with a predetermined amount of molten rubber material between an injection hole (not shown) formed in the main body 71 and a jig (not shown) that covers the main body 71 and the main body 71. It is formed into a predetermined shape by being injected and cured by pressure (see FIG. 8).

  On the other end side in the axial direction of the cushion member 73, three first cushion portions 73a are provided along the protruding direction of each protruding portion 71a of the main body portion 71. Each of the first cushion portions 73a is formed in a thin shape and is mounted on the radially inner side of each of the protruding portions 71a. The length dimension along the circumferential direction of each 1st cushion part 73a is set to the length dimension longer than the length dimension along the circumferential direction of each protrusion part 71a, The circumference | surroundings of each 1st cushion part 73a A first bulging portion 73b and a second bulging portion 73c that protrude from the protruding portions 71a are provided at both ends along the direction.

  Each bulging part 73b, 73c comes into contact with the armature shaft side connecting member 60 in a state where the armature shaft side connecting member 60 is connected to the worm shaft side connecting member 70. This prevents the amateur shaft side connecting member 60 and the worm shaft side connecting member 70 from coming into direct contact with each other in the circumferential direction, thereby suppressing the generation of abnormal noise.

  A first holding portion 73d and a second holding portion 73e as connecting and holding members, each of which has a larger protruding amount from each protruding portion 71a, are provided at the other axial end of each of the bulging portions 73b and 73c. It is provided integrally. Each of the holding portions 73d and 73e is configured to hold the connection state between the armature shaft side connecting member 60 and the worm shaft side connecting member 70 when the motor 10 with the speed reducing mechanism is assembled. This is to ensure efficient assembly.

  Between the circumferential directions of the first cushion portions 73a, there are provided three pressing projections 73f that protrude to the other end side in the axial direction. The protrusion height of each pressing protrusion 73f is set to a protrusion height lower than the protrusion height of each first cushion portion 73a toward the other end in the axial direction, and each pressing protrusion 73f is an amateur shaft side connecting member. 60 is in contact with the radially inner side of each protrusion 62 (see FIGS. 3 and 6).

  Each pressing protrusion 73f constitutes an elastic member in the present invention, and is provided between the armature shaft side connecting member 60 and the worm shaft side connecting member 70 in a state of being elastically deformed. Each pressing projection 73f presses the armature shaft 24 toward the other end in the axial direction via the armature shaft side connecting member 60, and the reaction force is generated by the spherical surface portion 71d of the main body portion 71, the third steel ball 80, and the worm shaft. A load is applied so as to press the worm shaft 43 toward one end in the axial direction through the concave portion 43e of 43. That is, each pressing protrusion 73f presses the armature shaft 24 and the worm shaft 43 in directions that are separated from each other in the axial direction.

  The connecting member 50 includes the armature shaft side connecting member 60 fixed to the armature shaft 24 and the worm shaft side connecting member 70 pressed against the third steel ball 80 by the pressing protrusions 73f. The movement in the axial direction with respect to the amateur shaft 24 and the worm shaft 43 is restricted (movement restricted state). That is, the connecting member 50 is provided without rattling with respect to the armature shaft 24 and the worm shaft 43 due to the elastic force of each pressing protrusion 73f.

  A second cushion portion 73g that elastically deforms and bites into the serration portion 43d of the worm shaft 43 is provided on one end side in the axial direction of the cushion member 73. The second cushion portion 73g is close to the rigid member 72. Are arranged. The second cushion portion 73g elastically deforms and bites into the serration portion 43d, thereby preventing the serration portion 43d from rattling within the main body portion 71 (vibration absorption) and suppressing the generation of abnormal noise. ing.

  As shown in FIG. 3, the connecting member 50 does not directly contact the cushion member 73 and the armature shaft 24, but the armature shaft 24 is the third steel ball 80 and the cushion member 73 is the armature shaft side connecting member 60. Are in contact with each other. This is to prevent heat generated in the armature 23 by rotationally driving the motor unit 20 from being directly transmitted from the armature shaft 24 to the cushion member 73. Degradation) is suppressed.

  As shown in FIG. 1, the connector member 42 attached to the yoke 21 side of the gear case 41 includes a connector connecting portion 42a to which an external connector (not shown) on the vehicle side is connected, and the inside of the connector connecting portion 42a. A plurality of connection terminals (terminals) (not shown) are provided by insert molding. A part of each connection terminal is electrically connected to each brush 27.

  A sensor board 42b is provided inside the connector member 42, and a part of each connection terminal is electrically connected to the sensor board 42b and a pair of sensor magnets 90 facing the outside in the radial direction. Hall IC 42c (only one is shown in the figure) is mounted.

  Each Hall IC 42c is electrically connected to a controller (not shown), and the controller detects the number of square wave signals from each Hall IC 42c generated according to the rotation of the sensor magnet 90 and the appearance timing thereof, thereby The rotational speed, rotational position, etc. (rotation state) of the shaft 43 are detected. However, in the present embodiment, an MR sensor (magnetoresistive element) can be used instead of the Hall IC 42c.

  Next, the operation of the motor 10 with the speed reduction mechanism configured as described above will be described in detail with reference to the drawings.

  11A and 11B are explanatory views for explaining the relative rotation state of the armature shaft side connecting member relative to the worm shaft side connecting member, FIG. 12 is an explanatory view for explaining the operation of the elastic member, and FIG. FIGS. 14A and 14B are explanatory views for explaining a state in which the reaction force from the worm wheel is applied to the worm shaft, and FIG. 14 is an explanatory view for explaining a state in which the worm shaft is eccentric with respect to the connecting member. ing.

[CW rotation]
When an operation switch (not shown) is closed to close the window glass, a predetermined drive current is supplied to each brush 27 and the armature shaft 24 rotates clockwise (CW rotation). Then, as shown in FIG. 11A, the armature shaft side connecting member 60 also rotates CW with the CW rotation of the armature shaft 24, and the other side wall surface 65 in each protrusion 62 of the armature shaft side connecting member 60 is The worm shaft side connecting member 70 is close to the one side wall surface 71b of each protrusion 71a. At this time, since the first bulging portion 73b of the cushion member 73 is disposed between the other side wall surface 65 and the one side wall surface 71b, collision with the one side wall surface 71b of the other side wall surface 65 is avoided ( The occurrence of abnormal noise is suppressed. Thereafter, the rotational force from the armature shaft side connecting member 60 is transmitted to the worm shaft side connecting member 70, and both rotate integrally.

  At this time, as shown by the arrows in FIG. 12, each pressing projection 73f presses the armature shaft side connecting member 60 fixed to the armature shaft 24 with a predetermined elastic force F, and the reaction force f causes the spherical surface portion 71d to move. And the third steel ball 80 is pressed through. Therefore, the connecting member 50 does not rattle with respect to the amateur shaft 24 and the worm shaft 43. Even if, for example, the contact portion between the one axial end of the armature shaft 24 and the third steel ball 80 is worn and the clearance L is generated due to repeated rotation and stop of the armature shaft 24, each pressing projection 73f Since the armature shaft 24 and the worm shaft 43 are always pressed in the direction away from each other in the axial direction, rattling between the armature shaft 24 and the worm shaft 43 can be suppressed.

  With the rotation of the worm shaft side connecting member 70, a rotational force is transmitted from the uneven hole 71f to the serration portion 43d, and the worm shaft 43 rotates. Then, along with the rotation of the worm shaft 43, the worm wheel 44 having gear teeth meshing with the worm portion 43a rotates in the direction of the arrow (1) in FIG. Thereby, the pinion 44a of the worm wheel 44 rotates in a predetermined direction, and the window glass is closed via the window regulator. At this time, the driving resistance of the window regulator is transmitted to the worm wheel 44, and a reaction force is applied in the direction (counterclockwise direction) indicated by the broken line arrow in the figure.

  Along with the counterclockwise reaction force applied to the worm wheel 44, a thrust force is applied to the worm shaft 43 in the direction of the arrow (2) in the figure, and the worm portion 43a and the worm wheel 44 are Due to the meshing relationship with the gear teeth, a force is applied in the direction of arrow (3) in the figure, that is, in the direction in which the worm shaft 43 warps upward in the figure. Then, a force F1 indicated by a hollow arrow in the drawing is applied from the second held portion 43c of the worm shaft 43 toward the fourth radial bearing 48, and the second held portion 43c and the fourth radial are loaded. A predetermined frictional force is generated between the bearing 48 and the bearing 48.

  Here, the worm shaft 43 is inclined by a minute angle with respect to the worm shaft side connecting member 70 via the third steel ball 80, and the serration portion 43d is indicated by the arrow M in FIG. Co-rotates with eccentricity in the direction. At this time, the worm shaft side connecting member 70 allows the serration portion 43d to be eccentric, and the serration portion 43d rolls within the worm shaft side connecting member 70. Therefore, the worm shaft 43 and the worm shaft side connecting member 70 can rotate together without causing rotational resistance, and as a result, the transmission of the reaction force in the twisting direction from the worm shaft side connecting member 70 to the worm shaft 43 is prevented. The frictional force between the second held portion 43c and the fourth radial bearing 48 is not increased.

  On the other hand, since the so-called “vibration” of the worm shaft 43 as described above is not transmitted to the worm shaft side connecting member 70, no “vibration” occurs in the sensor magnet 90. And the Hall IC 42c do not change, and it is possible to suppress variations in the detection performance of the magnetic force of the sensor magnet 90 by the Hall IC 42c.

[CCW rotation]
When the operation switch is opened to open the window glass, a predetermined drive current is supplied to each brush 27, and the armature shaft 24 rotates counterclockwise (CCW rotation). Then, as shown in FIG. 11 (b), the armature shaft side connecting member 60 also CCW rotates along with the CCW rotation of the armature shaft 24, and one side wall surface 64 in each projecting portion 62 of the armature shaft side connecting member 60 becomes The worm shaft side connecting member 70 is close to the other side wall surface 71c of each protrusion 71a. At this time, since the second bulging portion 73c of the cushion member 73 is disposed between the one side wall surface 64 and the other side wall surface 71c, collision with the other side wall surface 71c of the one side wall surface 64 is avoided ( The occurrence of abnormal noise is suppressed. Thereafter, the rotational force from the armature shaft side connecting member 60 is transmitted to the worm shaft side connecting member 70, and both rotate integrally.

  At this time, each pressing protrusion 73f operates in the same manner as during CW rotation, that is, as shown in FIG. 12, the connecting member 50 does not rattle with respect to the armature shaft 24 and the worm shaft 43, and a clearance L is generated. Even if this is the case, rattling between the armature shaft 24 and the worm shaft 43 can be suppressed.

  With the rotation of the worm shaft side connecting member 70, a rotational force is transmitted from the uneven hole 71f to the serration portion 43d, and the worm shaft 43 rotates. Then, with the rotation of the worm shaft 43, the worm wheel 44 having gear teeth meshing with the worm portion 43a rotates in the direction of arrow (4) in FIG. Thereby, the pinion 44a of the worm wheel 44 rotates in a predetermined direction, and the window glass is opened via the window regulator. At this time, the driving resistance and the like of the window regulator are transmitted to the worm wheel 44, and a reaction force is applied in the direction (clockwise direction) indicated by the broken line arrow in the figure.

  Along with the loading of the reaction force in the clockwise direction on the worm wheel 44, the worm shaft 43 is loaded with a thrust direction force in the direction of the arrow (5) in the figure, and between the worm portion 43a and the worm wheel 44. Due to the meshing relationship with the gear teeth, a force is applied in the direction of arrow (6) in the figure, that is, in the direction in which the worm shaft 43 warps upward in the figure. Then, a force F2 indicated by a hollow arrow in the drawing is applied from the first held portion 43b of the worm shaft 43 to the third radial bearing 47, and the first held portion 43b and the third radial portion are loaded. A predetermined frictional force is generated between the bearing 47 and the bearing 47.

  Here, the worm shaft 43 is inclined by a minute angle with respect to the worm shaft side connecting member 70 via the third steel ball 80, and the serration portion 43d is indicated by the arrow M in FIG. Co-rotates with eccentricity in the direction. Therefore, as in the CW rotation, the friction force between the first held portion 43b and the third radial bearing 47 is not increased, and the detection performance of the magnetic force of the sensor magnet 90 by the Hall IC 42c varies. It does not occur.

  Further, since the diameter size of the first held portion 43b and the diameter size of the second held portion 43c are set to substantially the same diameter size, the frictional forces due to the forces F1 and F2 are substantially equal values. It has become. Therefore, the load on the motor unit 20 is substantially equal regardless of the rotation direction of the worm shaft 43 (CW rotation / CCW rotation).

  As described above in detail, according to the motor 10 with the speed reduction mechanism according to the present embodiment, the armature shaft side connecting member 60 provided on one end side of the armature shaft 24 and the worm provided on the other end side of the worm shaft 43. Since the three pressing protrusions 73f that press the armature shaft 24 and the worm shaft 43 in the axial direction are provided between the shaft side connecting members 70, the connecting members 60, 70 are connected to the pressing protrusions 73f. It can be provided between the armature shaft 24 and the worm shaft 43 in a state where they are separated from each other by the elastic force F (reaction force f), that is, in a state of being stretched in the separation direction. Accordingly, the connecting members 60 and 70 can be provided without rattling with respect to the armature shaft 24 and the worm shaft 43, and as a result, it is possible to prevent the generation of noise and the early deterioration of the connecting members 60 and 70.

  Further, according to the motor 10 with the speed reduction mechanism according to the present embodiment, the armature shaft side connecting member 60 is fixed to one end side of the armature shaft 24, and the worm shaft side connecting member 70 is swung to the other end side of the worm shaft 43. Since it is movably connected, the eccentricity (axis deviation) of the armature shaft 24 and the worm shaft 43 is allowed, and the motor 10 with the speed reduction mechanism can be smoothly rotated.

  Furthermore, according to the motor 10 with the speed reduction mechanism according to the present embodiment, the cushion member 73 of the connecting member 70 has the first holding portion 73d and the second holding portion that hold the connected state of the connecting members 60 and 70. Since 73e is provided, the amateur shaft side connecting member 60 and the worm shaft side connecting member 70 can be connected to form a sub-assembly. Therefore, the motor 10 with the speed reduction mechanism can be assembled in a state where the connecting members 60 and 70 are sub-assembled, and the assembly efficiency of the motor 10 with the speed reduction mechanism can be improved.

  Further, according to the motor 10 with the speed reduction mechanism according to the present embodiment, the yoke 21 that houses the armature shaft 24 and the gear case 41 that is connected to the yoke 21 and houses the worm shaft 43 and the worm wheel 44 are provided. 41 is provided with the resin material 12 for adjusting the backlash in the axial direction of the armature shaft 24 and the worm shaft 43, so that variation in the elastic force F (reaction force f) of each pressing projection 73f for each product is suppressed. Can do.

  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 pressing protrusions 73f as the elastic members are integrally provided on the cushion member 73 of the worm shaft side connecting member 70. However, the present invention is not limited to this, and the amateur shaft An elastic member can also be provided on the side connecting member 60 side by an adhesive means such as welding. In this case, the elastic member is not limited to rubber, and a coil spring or a leaf spring made of steel can also be used.

  Moreover, in the said embodiment, although what used the motor 10 with a speed-reduction mechanism as a drive source of the power window apparatus mounted in a vehicle was shown, this invention is not limited to this, Other sunroof apparatuses etc. It can also be used as a drive source.

  Furthermore, in the said embodiment, although what employ | adopted the electric motor with a brush as the motor part 20 was shown, this invention is not restricted to this, For example, a brushless electric motor etc. can also be employ | adopted.

It is a fragmentary sectional view of the motor with a speed reduction mechanism concerning the present invention. It is a perspective view which shows the armature, connecting member, and worm shaft of the motor with a speed reduction mechanism of FIG. It is an expanded sectional view of the broken-line circle B part of FIG. It is an expanded sectional view which follows the AA line of FIG. It is a perspective view showing a worm shaft and a pair of bearing members. FIG. 3 is a perspective view of a connecting member viewed from the direction of arrow C in FIG. 2. FIG. 3 is a perspective view of a connecting member viewed from the direction of arrow D in FIG. 2. It is a disassembled perspective view which decomposes | disassembles and shows a connection member. (A), (b) is a perspective view explaining the rigid member which carried out insert molding. (A), (b) is a perspective view explaining the injection-molded cushion member. (A), (b) is explanatory drawing explaining the state of relative rotation with respect to the worm shaft side connection member of an amateur shaft side connection member. It is explanatory drawing explaining operation | movement of an elastic member. (A), (b) is explanatory drawing explaining the state by which the reaction force from a worm wheel was loaded on the worm shaft. It is explanatory drawing explaining the state in which the worm shaft was eccentric with respect to the connection member.

Explanation of symbols

10 Motor with Reduction Mechanism 11 Fastening Screw 12 Resin Material (Thrust Adjustment Member)
20 Motor part 21 Yoke (motor case)
21a Bottomed cylinder part 22 Magnet 23 Amateur 24 Amateur shaft 24a Two-way part 25 Commutator 26 Brush holder 27 Brush 28 Spring member 29 First radial bearing 30 First thrust bearing 31 First steel ball 32 Second radial Bearing 40 Gear part 41 Gear case 41a Filling part 41b Opening part 41c Communication hole 42 Connector member 42a Connector connection part 42b Sensor substrate 42c Hall IC
43 Worm shaft (deceleration mechanism)
43a Worm part 43b First held part 43c Second held part 43d Serration part 43e Recess 44 Warm wheel (deceleration mechanism)
44a pinion 45 second thrust bearing 46 second steel ball 47 third radial bearing 48 fourth radial bearing 50 connecting member 60 amateur shaft side connecting member 61 main body 62 projecting portion 63 fixing hole 64 one side wall surface 65 other Side wall surface 70 Worm shaft side connecting member 71 Body portion 71a Protruding portion 71b One side wall surface 71c Other side wall surface 71d Spherical surface portion 71e Protrusion 71f Irregular hole 72 Rigid member 73 Cushion member 73a First cushion portion 73b First bulging portion 73c 2nd bulging part 73d 1st holding | maintenance part (connection holding member)
73e 2nd holding | maintenance part (connection holding member)
73f Pressing protrusion (elastic member)
73 g Second cushion portion 80 Third steel ball 90 Sensor magnet 91 Mounting wheel F Elastic force f Reaction force L Clearance

Claims (4)

A motor case formed of a metal into a bottomed cylindrical shape;
An armature shaft pivotally supported at the other end of the motor case and rotatably provided on the motor case;
An armature shaft side connecting member provided on one end side of the armature shaft so as to be integrally rotatable with the armature shaft;
A gear case coupled to the motor case;
One end is pivotally supported on the gear case, and a worm shaft that is rotatably provided on the gear case;
A worm shaft side coupling member provided on the other end side of the worm shaft so as to be integrally rotatable with the worm shaft and coupled to the armature shaft side coupling member so as to be integrally rotatable;
A motor with a speed reduction mechanism,
A speed reduction mechanism comprising: an elastic member provided between the armature shaft side connecting member and the worm shaft side connecting member and pressing the armature shaft and the worm shaft in a direction away from each other in the axial direction. With motor.   2. The motor with a speed reduction mechanism according to claim 1, wherein the armature shaft side connecting member is press-fitted and fixed to one end side of the armature shaft, and the worm shaft side connecting member is swingably connected to the other end side of the worm shaft. A motor with a speed reduction mechanism.   3. The motor with a speed reduction mechanism according to claim 1, wherein at least one of the armature shaft side connecting member and the worm shaft side connecting member is connected to the armature shaft side connecting member and the worm shaft side connecting member. A motor with a speed reduction mechanism, characterized in that a connection holding member for holding the state is provided.   4. The motor with a speed reduction mechanism according to claim 1, wherein a thrust adjusting member that adjusts backlash in the axial direction of the armature shaft and the worm shaft is provided on one end side of the worm shaft in the gear case. A motor with a speed reduction mechanism is provided.

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