JP2017225288A - Motor with reduction gear and assembly method for motor with reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with a reduction gear, which is able to improve fitting of members such as a worm shaft and a worm wheel, and to provide an assembly method for a motor with a reduction gear.SOLUTION: A motor 1 with a reduction gear comprises: a rotation shaft 61 provided with a worm gear 62 and supported so as to freely rotate around a center axis via a plurality of bearings 67A, 67B; a motor part 30 that rotates and drives the rotation shaft 61 around the center axis; a reduction gear part 60 having at least one or more gears including a worm wheel 63 engaged with the worm gear 62; and casing 10 having a shaft accommodation groove 12 for accommodating the rotation shaft 61, bearing accommodation recesses 15A, 15B for accommodating bearings 67A, 67B, and an accommodation recess 11 for accommodating the reduction gear part 60. The shaft accommodation groove 12, bearing accommodation recesses 15A, 15B, and accommodation recess 11 are open on the top surface part 10t side of the casing 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor with a speed reducer and a method for assembling a motor with a speed reducer.

  As a motor with a reduction gear mounted on a vehicle, for example, there is one used for a power window device of an automobile. In this type of motor with a speed reducer, a worm speed reducer and a motor unit are connected. The worm speed reducer includes a worm gear provided on a worm shaft that is driven to rotate about a central axis by a motor unit, a worm wheel meshed with the worm gear, and a drive gear coupled to the worm wheel. With this drive gear, the window glass is opened and closed.

  Conventionally, in such a motor with a reduction gear, a configuration is known in which a worm shaft and a central shaft of a worm wheel and a drive gear are arranged orthogonal to each other (see, for example, Patent Document 1).

JP 2014-171365 A

By the way, the worm shaft, the worm wheel, and the drive gear are all housed in a casing (housing) of a motor with a reduction gear.
Here, the worm wheel and the drive gear are incorporated into the housing recess formed in the casing from the opening side of the housing recess along the direction of the central axis of the worm wheel and the drive gear.
On the other hand, the worm shaft is inserted into a shaft insertion hole formed in the casing from a direction along the central axis of the worm shaft. The shaft insertion hole is formed with an opening communicating with the housing recess, and the worm gear formed on the worm shaft is exposed from the opening into the housing recess and meshes with the worm wheel.

  Thus, the assembly direction of the worm shaft with respect to the casing is different from the assembly direction of the worm wheel and the drive gear. For this reason, when assembling the motor with a reduction gear, the direction of the casing must be changed according to the member to be assembled, which takes time and effort.

  In order to improve the operating efficiency of the motor with a reduction gear, it is desirable to incorporate the worm shaft into the casing via a bearing. However, if the worm shaft into which the bearing is press-fitted is inserted into the insertion hole of the casing, it is difficult to assemble because the bearing protrudes radially outward from the worm shaft.

  Accordingly, the present invention has been made in view of the above-described circumstances, and a motor with a reduction gear capable of improving the assembling property of members such as a worm shaft and a worm wheel, and a method of assembling the motor with a reduction gear Is to provide.

The present invention employs the following means in order to solve the above problems.
That is, the motor with a speed reducer of the present invention is provided with a worm gear, a rotary shaft that is rotatably supported around a central axis via a plurality of bearings, and a motor unit that rotationally drives the rotary shaft around the central axis. A reduction gear portion including at least one gear including a worm wheel meshing with the worm gear, a shaft receiving recess for receiving the rotating shaft, a bearing receiving recess for receiving the bearing, and a reduction gear for receiving the reduction gear portion And a shaft housing recess, wherein the shaft housing recess, the bearing housing recess, and the speed reducer housing recess are open on one side of the casing.

According to such a configuration, since the shaft housing recess, the bearing housing recess, and the speed reducer housing recess are all open on the one surface side of the casing, the gears constituting the rotating shaft, the bearing, and the speed reducer portion are It is possible to incorporate from the same direction on one side with respect to the casing. Therefore, when assembling the motor with a reduction gear, it is possible to suppress the change in the direction of the casing in accordance with the parts to be incorporated, and to improve the assemblability.
Moreover, since the rotating shaft can be incorporated into the casing via the bearing, the operating efficiency of the motor with a reduction gear can be improved.

  In the motor with a reduction gear according to the present invention, a commutator constituting the motor unit is provided on the rotating shaft, and a motor housing unit that houses the commutator of the motor unit is opened on the one surface side in the casing. It may be formed.

  According to such a configuration, the motor accommodating portion that accommodates the commutator is open on the one surface side of the casing in the same manner as the shaft accommodating concave portion, the bearing accommodating concave portion, and the reduction gear accommodating concave portion, and therefore the commutator provided on the rotating shaft. Can be incorporated into the casing together with the rotating shaft.

  The motor with a reduction gear according to the present invention may further include a brush holder that holds a brush that is in sliding contact with the outer peripheral surface of the commutator, and the brush holder may be fixed to the motor housing portion.

  According to such a configuration, since the motor housing portion opens on the one surface side of the casing in the same manner as the shaft housing recessed portion, the bearing housing recessed portion, and the speed reducer housing recessed portion, the brush holder also includes the rotating shaft, the bearing, and the speed reducer. It becomes possible to incorporate into the casing from the same direction as the part.

  In the motor with a reduction gear according to the present invention, a cover that covers the shaft housing recess, the bearing housing recess, the speed reducer housing recess, and the motor housing is provided on one surface side of the casing. The cover may be integrally provided.

  According to such a configuration, since the brush holder is provided integrally with the cover, when the cover is attached to the casing, the brush holder can be incorporated into the motor housing portion at the same time.

  In the motor with a reduction gear according to the present invention, the bearing housing recess includes an elastically deformable rib projecting toward the bearing side at a position orthogonal to the one surface side and opposed to the radially outer side of the bearing. May be.

  According to such a structure, if the bearing which supports a rotating shaft is press-fit in a bearing accommodation recessed part, a bearing can be restrained in a radial direction by a rib.

  Furthermore, in the motor with a reduction gear according to the present invention, at least two of the bearings are provided at an interval in the direction of the central axis of the rotating shaft, and the bearing receiving recess for storing one of the bearings is in the rotating shaft direction. A positioning surface that is formed on one side and abuts against one surface of the bearing, and a pressing portion that is formed on the other side in the rotation axis direction and presses the bearing toward the positioning surface.

  According to such a configuration, one of the bearings provided on the rotating shaft is sandwiched between the positioning surface of the bearing housing recess and the pressing portion, and the position of the rotating shaft in the central axis direction is defined by the positioning surface. . Thereby, a rotating shaft can be accurately integrated in a casing.

  In the motor with a reduction gear according to the present invention, the width dimension of the shaft receiving recess may be smaller than the width dimension of the bearing receiving recess in the direction orthogonal to the rotation axis.

  According to such a configuration, even if a lubricant such as grease filled in the bearing flows out of the bearing, the width of the shaft receiving recess is smaller than that of the bearing receiving recess, so that the lubricant is scattered by the rotation of the rotating shaft. As a result, insufficient lubrication can be suppressed.

  The present invention also relates to a method of assembling a motor with a reduction gear as described above, wherein the rotation is made with respect to the shaft housing recess, the bearing housing recess, and the speed reducer housing recess that are open on one side of the casing. The shaft, the bearing, and the gear constituting the reduction gear unit are incorporated from the one surface side.

  According to such a method, when assembling the motor with a speed reducer, it is possible to suppress the necessity of changing the direction of the casing in accordance with the parts to be incorporated, and to improve the assemblability.

  According to the present invention, it is possible to improve the assembling property of members such as a worm shaft and a worm wheel.

It is a perspective view which shows the external appearance of the motor with a reduction gear in embodiment of this invention. FIG. 3 is a perspective development view showing a component configuration of a motor with a reduction gear according to the embodiment of the present invention. It is a perspective view which shows the casing which comprises the motor with a reduction gear in embodiment of this invention. It is a top view of the casing in the embodiment of the present invention. It is a perspective view which shows the state which removed the cover of the motor with a reduction gear in embodiment of this invention. It is a top view which shows the state which incorporated the rotating shaft in which the armature, the commutator, and the bearing were provided in the casing in embodiment of this invention. It is a perspective view which shows the brush holder which comprises the motor part in embodiment of this invention. It is the perspective view which looked at the brush holder in embodiment of this invention from the direction different from FIG. It is an expansion perspective view which shows a part of brush holder in embodiment of this invention. It is a perspective view which shows the state which incorporated the brush holder in embodiment of this invention in the motor accommodating part of the casing. It is a perspective view which shows the connector member with which the casing in embodiment of this invention was mounted | worn. It is a figure which shows the structure of the connector member in embodiment of this invention. It is a perspective view which shows the state which connects the connector member in embodiment of this invention to a brush holder. It is a top view which shows the state which the bearing provided in the one end side of the rotating shaft in embodiment of this invention fitted to the bearing accommodation recessed part. It is a figure which shows the positional relationship of the rotating shaft in the embodiment of this invention, a worm wheel, and a spur gear, and is the figure which looked at the casing from the center axis direction of the rotating shaft. It is a perspective view which shows the state before attaching a rotating shaft to the casing in embodiment of this invention. It is a perspective view which shows the state which incorporated the rotating shaft in embodiment of this invention in the casing. It is a perspective view which shows the state before attaching the brush holder in embodiment of this invention to a casing. It is a perspective view which shows the structure at the time of providing the brush holder in embodiment of this invention integrally with a cover. It is a figure which shows the position of the spring of a brush holder in the state before attaching the connector member of embodiment of this invention. It is a figure which shows the position of the spring of a brush holder in the state after assembled | attaching the connector member of embodiment of this invention.

  Next, a motor with a reduction gear and a method for assembling a motor with a reduction gear according to an embodiment of the present invention will be described with reference to the drawings.

(Motor with reduction gear)
FIG. 1 is a perspective view showing an appearance of a motor 1 with a speed reducer. FIG. 2 is an exploded perspective view showing a component configuration of the motor 1 with a speed reducer. FIG. 3 is a perspective view showing the casing 10 constituting the motor 1 with a speed reducer. FIG. 4 is a plan view of the casing 10.
As shown in FIGS. 1 and 2, the motor 1 with a speed reducer is used for a power window device of a vehicle, for example, and includes a casing 10 and a motor unit 30 provided on one end side of the casing 10. And a reduction gear unit 60 connected to the motor unit 30 and accommodated in the casing 10.

(casing)
As shown in FIGS. 2, 3, and 4, the casing 10 has an accommodation recess 11 that accommodates the reduction gear unit 60 on one surface side thereof. The housing recess 11 is recessed from the top surface portion (one surface) 10t of the casing 10 toward the back surface portion 10b facing the top surface portion 10t. The housing recess 11 has, on its bottom surface 11b, a shaft housing groove (shaft housing recess) 12 for housing a rotating shaft 61 described later, a first shaft 13 for supporting a worm wheel 63 (see FIG. 2), and the like, and a drive gear 66. (See FIG. 2) and the like.

  Here, as shown in FIGS. 3 and 4, the shaft housing groove 12 is formed to extend in one direction along the bottom surface 11 b of the housing recess 11. The shaft receiving groove 12 is formed such that one end 12 a and the other end 12 b extend to the outside of the receiving recess 11. Bearing receiving recesses (bearing receiving recesses) 15 </ b> A and 15 </ b> B are formed in the shaft receiving groove 12 at positions outside the receiving recess 11.

  The 1st axis | shaft 13 and the 2nd axis | shaft 14 are provided so that it may orthogonally cross to the bottom face 11b, and it may extend toward the opening direction (top | upper surface part 10t side) of the accommodating recessed part 11. FIG. The first shaft 13 and the second shaft 14 are provided on one side and the other side of the shaft housing groove 12.

  A motor accommodating portion 16 that accommodates a part of the motor portion 30 is formed on the outer peripheral portion of the casing 10. The motor housing portion 16 has a bottom plate portion 16a formed on the same side as the bottom surface 11b of the housing recess portion 11, and a side wall rising from both sides of the bottom plate portion 16a toward the opening direction of the housing recess portion 11 (the top surface portion 10t side of the casing 10). The section 16b has a substantially U-shaped cross section.

  Further, in the casing 10, an insertion recess 17 is formed between the housing recess 11 and the motor housing 16 so as to be recessed from the top surface portion 10 t of the casing 10 toward the back surface portion 10 b and to allow the rotary shaft 61 to be inserted into and out of the casing 10. Has been. The insertion recess 17 is formed to be continuous with one end 12 a of the shaft housing groove 12.

A plurality of convex portions 18 projecting toward the outer peripheral side are formed on the outer peripheral portion of the casing 10. Each convex portion 18 is formed with a bolt insertion hole 18h through which a bolt (not shown) for fixing the casing 10 to the vehicle body is inserted.
Here, each convex portion 18 has a position in the vicinity of the other end portion 12b of the shaft receiving groove 12, and one side and the other side of the shaft receiving groove 12 on the one end portion 12a side of the shaft receiving groove 12. And a total of three locations.

In addition, a step portion 19 that is recessed toward the back surface portion 10b from the top surface portion 10t is formed on the peripheral portion of the housing recess 11 in the top surface portion 10t of the casing 10.
As shown in FIG. 1, a substantially plate-shaped cover 8 is fitted into the step portion 19. A plurality of hook portions 8 f extending on one side of the cover 8 are formed on the outer peripheral portion of the cover 8. Then, the cover 8 is fixed to the casing 10 by engaging the hook portions 8 f with engaging protrusions 10 a formed at a plurality of locations on the outer peripheral surface of the casing 10.

(Motor part)
FIG. 5 is a perspective view showing a state where the cover of the motor 1 with speed reducer is removed. FIG. 6 is a plan view showing a state in which the rotating shaft 61 provided with the armature 32, the commutator 35, and the bearings 67A and 67B is incorporated in the casing 10. FIG.
As shown in FIGS. 2, 5, and 6, for example, a DC motor with a brush is used as the motor unit 30. The motor unit 30 includes a yoke 31, an armature 32, a commutator 35, a brush holder 40 holding a pair of brushes 43, 43, and a connector member 50 (see FIG. 1).

  As shown in FIG. 1, the yoke 31 is fixed to the end of the motor housing portion 16 provided on the outer peripheral surface of the casing 10 with a screw or the like (not shown). The yoke 31 has a substantially bottomed cylindrical shape, and a permanent magnet (not shown) is fitted on the inner peripheral surface thereof.

As shown in FIGS. 5 and 6, the armature 32 has an armature core 33 and an armature coil 34.
The armature core 33 is externally fitted and fixed to one end 61 a of the rotating shaft 61. The armature core 33 is formed by laminating a plurality of substantially ring-shaped metal plates 33m in the axial direction, and has a plurality of slots 33s for winding windings.
A plurality of armature coils 34 are formed on the outer periphery of the armature core 33 by winding an enamel-coated winding inserted between the slots.

  The commutator 35 has a substantially cylindrical shape, and is externally fixed to the rotating shaft 61. The commutator 35 is disposed at a position spaced apart from the armature 32 provided at one end 61 a of the rotating shaft 61 by a predetermined length toward the other end 61 b of the rotating shaft 61. As shown in FIG. 6, a plurality of segments 35 s formed of a conductive material are attached to the outer peripheral surface of the commutator 35 in the circumferential direction.

FIG. 7 is a perspective view showing the brush holder 40 constituting the motor unit 30. FIG. 8 is a perspective view of the brush holder 40 as seen from a direction different from that in FIG. FIG. 9 is an enlarged perspective view showing a part of the brush holder 40.
As shown in FIGS. 7 and 8, the brush holder 40 includes a substantially plate-like support plate 41, a thermistor 42, and a pair of brushes 43 and 43 that are in sliding contact with the segment 35 s of the commutator 35.

The support plate 41 includes arm portions 41a and 41a extending in parallel to each other and a connecting portion 41b that connects the arm portions 41a and 41a on one end side, and has a gate shape.
The thermistor 42 is fixed to the connecting portion 41 b of the support plate 41.

  The brushes 43 and 43 are held by brush holders 41c and 41c that are formed in the arm portions 41a and 41a so as to be slidable along the direction in which the arm portions 41a and 41a face each other.

As shown in FIGS. 7 and 9, each brush 43 is urged toward the commutator 35 by a spring 44.
The spring 44 includes a coil portion 44a in which a steel wire is spirally wound, and extending portions 44b and 44c in which both ends of the steel wire forming the coil portion 44a extend in the tangential direction from the coil portion 44a. Yes. The spring 44 is provided by inserting the coil portion 44a through a support post 45 provided so as to extend perpendicular to the surface of each arm portion 41a.

  Further, a wall portion 46 that rises in parallel with the central axis direction of the support post 45 is formed in the arm portion 41 a at a position spaced outward in the radial direction of the support post 45. The wall portion 46 is formed with a bent portion 46a that is bent in a substantially V shape in plan view. One extending portion 44b of the spring 44 abuts against the bent portion 46a. Further, a concave portion 47 into which the other extended portion 44 c of the spring 44 is inserted is formed in the side end portion 46 b of the wall portion 46. The side end portion 46b is formed with an inclined surface 46d that protrudes to the side as it approaches the recess 47 from the side away from the arm portion 41a.

  The extended portion 44c of the spring 44 is inserted inside the concave portion 47 and biases the rear end portion 43b of the brush 43 held by the brush holding portion 41c in a direction protruding inward from the brush holding portion 41c. As a result, the brush 43 comes into sliding contact with the segment 35 s formed on the outer peripheral surface of the commutator 35.

  The support plate 41 is provided with connection terminals 49, 49 connected to the brushes 43, 43 via the wirings 48, 48. Here, one connection terminal 49 is connected to the thermistor 42, and the thermistor 42 and one brush 43 are connected via a wiring 48.

FIG. 10 is a perspective view showing a state in which the brush holder 40 is incorporated in the motor housing portion 16 of the casing 10.
As shown in the figure, the brush holder 40 is provided in the motor accommodating portion 16 provided on the outer peripheral surface of the casing 10.

  As shown in FIGS. 7 and 9, the support plate 41 of the brush holder 40 is formed with convex portions 41t and 41t protruding outward in the width direction at both ends in the width direction of the connecting portion 41b. Further, as shown in FIG. 10, the brush holder 40 is configured so that each convex portion 41 t is a side wall portion of the motor housing portion 16 with the support plate 41 being along the outer surface 10 s of the casing 10 in the motor housing portion 16. In 16b, it engages with the step part 16d formed in the top | upper surface part 10t side of the casing 10. FIG.

Further, as shown in FIGS. 3 and 4, the bottom plate portion 16a of the motor housing portion 16 has a substantially rectangular parallelepiped engagement projecting toward the top surface portion 10t side of the casing 10 at a position along the side wall portions 16b and 16b. Stop blocks 16k, 16k are formed.
As shown in FIG. 10, in the brush holder 40, the tip of each arm portion 41 a is inserted between the locking block 16 k and the outer surface 10 s of the casing 10.
In this state, the connection terminals 49 are provided so as to extend in a direction parallel to the central axis of the shaft housing groove 12 (see FIG. 3).

  Here, as shown in FIG. 7, the support plate 41 of the brush holder 40 protrudes at a position where it abuts against the side wall portions 16b and 16b, the step portions 16d and 16d, the locking blocks 16k and 16k, etc. 41x is formed, and the support plate 41 is press-fitted and held in the motor housing portion 16 by these protrusions 41x.

FIG. 11 is a perspective view showing the connector member 50 attached to the casing 10. FIG. 12 is a diagram illustrating the configuration of the connector member 50. FIG. 13 is a perspective view showing a state in which the connector member 50 is connected to the brush holder 40.
As shown in FIGS. 11 and 12, the connector member 50 is integrally provided with a frame portion 51 and a connector receiving portion 52.

The frame portion 51 has a substantially rectangular shape having an opening 51 a on the inside, and is fitted into a step portion 16 d formed at the end of the motor housing portion 16. The frame portion 51 is integrally formed with an extending portion 53 extending toward the one side wall portion 16 b, and a connector receiving portion 52 is provided at the tip of the extending portion 53.
The opening 51a of the frame portion 51 of the connector member 50 is covered by mounting the yoke 31 (see FIG. 1).

The connector receiving portion 52 has a substantially bottomed cylindrical hood 52a into which a connector (not shown) provided at the tip of a harness connected to the vehicle body side is inserted.
As shown in FIG. 1, one end of a terminal member 54 that is electrically connected to a harness side terminal (not shown) provided in the connector is held in the hood 52a.

The connector member 50 is provided at the end of the motor accommodating portion 16 and is disposed in the vicinity of the brush holder 40. As shown in FIG. 13, the other end portion 54 b of the terminal member 54 is led out to the back side of the frame portion 51. Further, the other end portion 54 b of the terminal member 54 extends in a direction orthogonal to the surface on which the frame portion 51 is located. The other end portion 54 b of the terminal member 54 is connected to the connection terminal 49 of the brush holder 40 held in the motor housing portion 16.
By connecting a connector (not shown) of a harness connected to an external power source (not shown) to the connector receiving portion 52 of such a connector member 50, the power of the external power source can be supplied to the motor unit 30.

Further, as shown in FIGS. 11 and 12, the connector member 50 is integrally provided with protrusions 55 and 55 inside the frame portion 51. Each protrusion 55 is formed to protrude toward the outer surface 10 s side of the casing 10 along the side wall portion 16 b of the motor housing portion 16. In a state where the connector member 50 is mounted on the motor housing portion 16, the tip of the protrusion 55 is disposed to face the locking block 16k.
Further, each projection 55 is formed with a concave groove 55m at a portion facing the support post 45 of the brush holder 40. The recessed groove 55m is formed so as to face the outer peripheral surface of the support post 45 with an interval smaller than the wire diameter of the wire forming the coil portion 44a of the spring 44.

(Reduction gear part)
As shown in FIGS. 2 and 5, the speed reducer 60 includes a rotating shaft 61, a worm gear 62, a worm wheel (gear) 63, a pinion gear (gear) 64, a spur gear (gear) 65, and a drive gear. (Gear) 66.

  As shown in FIG. 6, the rotary shaft 61 is accommodated in the shaft accommodating groove 12 of the casing 10 on the other end 61 b side of the armature 32 and the commutator 35 of the motor unit 30 provided on the one end 61 a side. The rotary shaft 61 is fitted with substantially annular bearings 67A and 67B at two locations spaced in the direction of the central axis.

The bearings 67 </ b> A and 67 </ b> B are so-called rolling bearings and are fitted into bearing housing recesses 15 </ b> A and 15 </ b> B formed in the casing 10.
As shown in FIG. 4, the bearing receiving recesses 15 </ b> A and 15 </ b> B have bottom surfaces of the bearing receiving recesses 15 </ b> A and 15 </ b> B from the top surface portion 10 t side of the casing 10 on both sides in the radial direction orthogonal to the central axis of the shaft receiving groove 12. A pair of elastically deformable ribs 15r extending toward 15c are provided to project. The bearings 67A and 67B abut against the bottom surface 15c of the bearing housing recesses 15A and 15A, and the ribs 15r and 15r are clamped on both sides in the radial direction, thereby restricting movement in the radial direction.

FIG. 14 is a plan view showing a state in which a bearing 67A provided on one side of the rotating shaft 61 is fitted in the bearing housing recess 15A.
As shown in FIGS. 4 and 14, the bearing housing recess 15 </ b> A on the motor housing portion 16 side is formed with a positioning surface 15 k orthogonal to the central axis direction of the shaft housing groove 12 on the side close to the housing recess 11. . Further, in the bearing accommodating recess 15A, a positioning rib (pressing portion) 15s formed to protrude from the surface facing the positioning surface 15k toward the positioning surface 15k is formed on the surface facing the positioning surface 15k. It is formed between the surface portion 10t side and the bottom surface 15c of the bearing housing recesses 15A and 15B.

  As shown in FIG. 14, the bearing 67A provided on one side of the rotating shaft 61 abuts against the positioning surface 15k and is pressed toward the positioning surface 15k by the positioning rib 15s provided on the opposite side. As a result, the bearing 67A is positioned in the central axis direction of the rotary shaft 61.

  As shown in FIG. 6, the bearing housing recess 15B on the side away from the motor housing portion 16 has an opening size larger than the axial thickness of the bearing 67B. The other end 61b of the rotating shaft 61 and the bearing 67B are accommodated in the bearing accommodating recess 15B. In the bearing 67B, only movement in the radial direction is restricted by the bottom surface 15c and the ribs 15r and 15r on both sides in the radial direction.

The worm gear 62 is formed integrally with the rotary shaft 61 in the intermediate portion between the bearings 67A and 67B. The rotating shaft 61 provided with the worm gear 62 is disposed in the shaft receiving groove 12.
Here, the width dimension W1 of the shaft receiving groove 12 in the direction orthogonal to the rotation shaft 61 is set smaller than the width dimension W2 of the bearing receiving recesses 15A and 15B.

As shown in FIGS. 2 and 5, the pinion gear 64 includes a substantially plate-like engagement plate portion 64a and a gear-like gear portion formed so as to protrude in the axial direction from one surface side of the engagement plate portion 64a. 64b.
On the outer peripheral portion of the engaging plate portion 64a, substantially fan-shaped engaging convex portions 64k protruding outward in the radial direction are formed at, for example, three locations with a spacing in the circumferential direction.
The pinion gear 64 is formed with a shaft insertion hole 64h into which the first shaft 13 formed in the casing 10 is inserted. The pinion gear 64 is rotatably supported around the first shaft 13 by inserting the first shaft 13 into the shaft insertion hole 64h.

The worm wheel 63 is formed in a substantially disk shape, and gear teeth 63g that mesh with the worm gear 62 are formed on the outer peripheral surface.
At the center in the radial direction of the worm wheel 63, an insertion hole 63h penetrating in the central axis direction is formed. Furthermore, a substantially fan-shaped engagement recess 63k that is recessed radially outward and engages with the engagement protrusion 64k of the pinion gear 64 around the insertion hole 63h is spaced apart in the circumferential direction by, for example, 3 It is formed in the place.
The worm wheel 63 is rotatably supported around the first shaft 13 integrally with the pinion gear 64 by inserting the pinion gear 64 into the insertion hole 63h.

  The worm wheel 63 and the pinion gear 64 rotate around the first shaft 13 when the rotation shaft 61 is driven to rotate about the central axis thereof by the motor unit 30.

The spur gear 65 is formed in a substantially disk shape, and gear teeth 65g that mesh with the gear portion 64b of the pinion gear 64 are formed on the outer peripheral surface thereof.
In the center of the spur gear 65 in the radial direction, an insertion hole (not shown) penetrating in the central axis direction is formed like the worm wheel 63, and a substantially fan-shaped engagement recess (not shown) is formed around the insertion hole. For example, it is formed in three places at intervals in the circumferential direction.

The drive gear 66 is integrally provided with a substantially disc-shaped plate portion 66a and a gear-shaped gear portion 66g formed on one surface side of the plate portion 66a.
An engaging projection (not shown) that engages with an engaging recess (not shown) of the spur gear 65 is provided on the plate 66a on the opposite side of the gear 66g.
Further, the drive gear 66 is formed with a shaft insertion hole 66h into which the second shaft 14 formed in the casing 10 is inserted. Thereby, the spur gear 65 and the drive gear 66 are provided to be rotatable around the second shaft 14.

  Here, as shown in FIG. 3, the bottom surface 11 b 1 of the second shaft 14 of the housing recess 11 of the casing 10 is formed at a position closer to the top surface portion 10 t of the casing 10 than the bottom surface 11 b 2 of the first shaft 13. As a result, as shown in FIG. 15, the spar gear 65 is disposed so that the outer peripheral portion of the spar gear 65 straddles the upper side of the rotating shaft 61, and above the worm wheel 63 that meshes with the worm gear 62.

  Such a reduction gear unit 60 is housed in the housing recess 11. As shown in FIG. 1, the reduction gear unit 60 is covered by a cover 8 attached to the casing 10 except for a part of the drive gear 66. The plate portion 66 a and the gear portion 66 g of the drive gear 66 are exposed to the outside of the cover 8 through a circular opening 8 h formed in the cover 8. Further, a window regulator or the like for opening and closing the vehicle window is engaged with the gear portion 66g.

(Operation of reducer motor)
When the motor unit 30 of the motor 1 with speed reducer is driven, the worm wheel 63 rotates through the rotating shaft 61 and the worm gear 62. Then, the drive gear 66 rotates together with the worm wheel 63, and a driving force for moving the vehicle window up and down can be output from the gear portion 66g of the drive gear 66.
Here, the speed reducer 60 is decelerated in two stages by meshing of the worm gear 62 and the worm wheel 63 and meshing of the pinion gear 64 and the spar gear 65.

(Assembly method of motor with reduction gear)
Next, a method for assembling the reduction gear-equipped motor 1 having the above-described configuration will be described.
FIG. 16 is a perspective view showing a state before the rotating shaft 61 is assembled to the casing 10. FIG. 17 is a perspective view showing a state in which the rotating shaft 61 is incorporated in the casing 10. FIG. 18 is a perspective view showing a state before the brush holder 40 is assembled to the casing 10. FIG. 19 is a perspective view showing a configuration when the brush holder 40 is provided integrally with the cover 8.
In order to assemble the motor 1 with a speed reducer having the above-described configuration, first, as shown in FIG. 16, the armature 32, the commutator 35, and the bearings 67A and 67B are assembled to the rotating shaft 61.

Next, as shown in FIG. 17, the rotary shaft 61 is assembled into the shaft housing groove 12 of the casing 10 along the central axis direction of the first shaft 13 and the second shaft 14 from the opening side of the housing recess 11. At this time, the bearings 67 </ b> A and 67 </ b> B are press-fitted into bearing housing recesses 15 </ b> A and 15 </ b> B formed in the casing 10.
As shown in FIG. 6, since the ribs 15r and 15r are formed in the bearing housing recesses 15A and 15B, the radial position of the rotating shaft 61 is easily and reliably positioned. Further, as shown in FIG. 14, a positioning surface 15k and positioning ribs 15s are formed in the bearing housing recess 15A. For this reason, the axial direction position of the rotating shaft 61 is easily and reliably positioned on the basis of the bearing 67A and the positioning surface 15k.

  As shown in FIG. 17, the commutator 35 provided on the rotating shaft 61 is accommodated in the motor accommodating portion 16 by incorporating the rotating shaft 61.

  Next, as shown in FIG. 5, the worm wheel 63, the pinion gear 64, the spur gear 65, and the drive gear 66 are inserted into the housing recess 11 of the casing 10 from the opening side of the housing recess 11. The shafts 14 are sequentially assembled along the central axis direction of the shaft 14.

Next, as shown in FIG. 18, the brush holder 40 is assembled along the central axis direction of the first shaft 13 and the second shaft 14 from the opening side of the housing recess 11.
At this time, as shown in FIG. 10, the brush holder 40 is inserted while supporting the support plate 41 along the outer surface 10 s of the casing 10 in the motor accommodating portion 16, and the convex portions 41 t and 41 t are inserted into the motor accommodating portion 16. The step portions 16d and 16d formed on the side wall portions 16b and 16b are engaged. Then, the tips of the arm portions 41 a and 41 a are inserted between the locking blocks 16 k and 16 k and the outer surface 10 s of the casing 10.

Thereafter, as shown in FIG. 1, the cover 8 is attached so as to cover the top surface portion 10 t of the casing 10. Here, the cover 8 is integrally formed with a motor cover portion 8m that covers the motor housing portion 16, and can simultaneously cover the motor housing portion 16.
Here, as shown in FIG. 19, the brush holder 40 may be attached integrally with the cover 8, and the cover 8 and the brush holder 40 may be assembled at the same time.

Next, as shown in FIG. 13, the connector member 50 is assembled to the motor housing portion 16 along the central axis direction of the rotation shaft 61. At this time, the terminal member 54 of the connector member 50 and the connection terminal 49 of the brush holder 40 each extend in the direction of the central axis of the rotating shaft 61. For this reason, the terminal member 54 of the connector member 50 and the connection terminal 49 of the brush holder 40 can be connected simultaneously with the assembly of the connector member 50.
Thereafter, the yoke 31 is attached to the end of the motor housing portion 16.

FIG. 20 is a view showing the position of the spring 44 of the brush holder 40 in a state before the connector member 50 is assembled. FIG. 21 is a view showing the position of the spring 44 of the brush holder 40 in a state after the connector member 50 is assembled.
By the way, when the connector member 50 is assembled, the spring 44 of the brush holder 40 can be assembled at the same time. For this purpose, as shown in FIG. 20, the coil portion 44 a of the spring 44 is inserted into each support post 45 before the brush holder 40 is assembled to the motor housing portion 16. At this time, the spring 44 has only to insert the coil portion 44 a only into the tip portion 45 s of the support post 45. Further, one extending portion 44 b of the spring 44 runs along the wall portion 46, and the other extending portion 44 c runs along the side end portion 46 b of the wall portion 46.

  In this manner, the brush holder 40 is assembled into the motor accommodating portion 16 with the springs 44 and 44 temporarily assembled to the support posts 45 and 45. In this state, the brush 43 is not biased toward the commutator 35 by the spring 44. For this reason, if the brush 43 is retracted radially outside in the brush holding portion 41c, the brush 43 can be prevented from interfering with the commutator 35 and assembled easily when the brush holder 40 is assembled. it can.

Thereafter, as shown in FIG. 21, the connector member 50 is assembled to the motor housing portion 16 along the central axis direction of the rotation shaft 61. At this time, as shown in FIGS. 11 and 20, the connector member 50 can be smoothly assembled by causing the protrusions 55 and 55 of the frame portion 51 to be along the side wall portions 16 b and 16 b of the motor housing portion 16.
Further, when the connector member 50 is assembled, each projection 55 comes into contact with the coil portion 44 a of the spring 44 temporarily assembled to the tip portion 45 s of the support post 45.

Accordingly, as shown in FIG. 21, when the connector member 50 is pushed in along the central axis direction of the rotation shaft 61, the coil portion 44 a of the spring 44 is caused to move to the base end side (support side) of the support post 45 by the protrusion 55. It is pushed into the plate 41 side. Then, the other extension part 44c moves along the side end part 46b as the coil part 44a is pushed. Then, finally, as shown in FIG. 9, the vehicle passes over the inclined surface 46 d and is inserted into the recess 47. Then, the brush 43 is urged by the spring 44 toward the commutator 35 on the radially inner side, and comes into contact with the outer peripheral surface of the commutator 35.
In this way, the springs 44, 44 can be set easily and reliably.

  As described above, the motor 1 with a speed reducer is provided with the worm gear 62 and is rotatably supported around the central axis via the plurality of bearings 67A and 67B, and the rotational axis 61 is rotated around the central axis. A reduction gear 60 having a worm wheel 63, a pinion gear 64, a spur gear 65, and a drive gear 66 meshing with the worm gear 62, a shaft housing groove 12 for housing the rotating shaft 61, a bearing 67A, Bearing housing recesses 15 </ b> A and 15 </ b> B for housing 67 </ b> B and a casing 10 formed with a housing recess 11 for housing the reduction gear unit 60, and a shaft housing groove 12, bearing housing recesses 15 </ b> A and 15 </ b> B, and a housing recess 11. Are open to the top surface 10t side of the casing 10.

  As described above, since the shaft housing groove 12, the bearing housing recesses 15A and 15B, and the housing recess 11 are all open on the top surface portion 10t side of the casing 10, the rotating shaft 61, the bearings 67A and 67B, and the speed reducer portion. The worm wheel 63, the pinion gear 64, the spur gear 65, and the drive gear 66 constituting the 60 can be incorporated from the same direction on the top surface portion 10 t side with respect to the casing 10. Therefore, when assembling the motor 1 with a speed reducer, it is possible to suppress the necessity of changing the direction of the casing 10 in accordance with the parts to be incorporated, and to improve the assemblability.

In addition, the motor accommodating portion 16 that accommodates the commutator 35 opens to the top surface portion 10 t side of the casing 10, which is the same as the shaft accommodating groove 12, the bearing accommodating recesses 15 </ b> A and 15 </ b> B, and the accommodating recess 11. For this reason, the commutator 35 provided on the rotating shaft 61 can be incorporated into the casing 10 together with the rotating shaft 61.
Further, the brush holder 40 is fixed to the motor housing portion 16. As a result, the brush holder 40 can also be incorporated into the casing 10 part from the same direction, similarly to the rotary shaft 61, the bearings 67A and 67B, and the speed reducer part 60.

  Further, by providing the brush holder 40 integrally with the cover 8, the brush holder 40 can be incorporated into the motor housing portion 16 simultaneously when the cover 8 is attached.

The bearing housing recesses 15A and 15B are provided with elastically deformable ribs 15r and 15r projecting toward the bearings 67A and 67B at positions orthogonal to the top surface portion 10t side and facing the radially outer sides of the bearings 67A and 67B. I have.
According to such a configuration, if the bearings 67A and 67B supporting the rotating shaft 61 are press-fitted into the bearing housing recesses 15A and 15B, the bearings 67A and 67B can be restrained in the radial direction by the ribs 15r and 15r.

  Further, one bearing 67A provided on the rotating shaft 61 is sandwiched between the positioning surface 15k of the bearing housing recess 15A and the positioning rib 15s, and the position of the rotating shaft 61 in the central axis direction is defined by the positioning surface 15k. The Thereby, the rotating shaft 61 can be incorporated in the casing 10 with high accuracy.

Further, the width dimension W1 of the shaft receiving groove 12 is smaller than the width dimension W2 of the bearing receiving recesses 15A and 15B in the direction orthogonal to the rotation shaft 61.
According to such a configuration, even if a lubricant such as grease filled in the bearings 67A and 67B flows out of the bearings 67A and 67B, the width dimension W1 of the shaft receiving groove 12 is smaller than that of the bearing receiving recesses 15A and 15B. Therefore, it is possible to prevent the lubricant from scattering due to the rotation of the rotating shaft 61 and insufficient lubrication.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the method for assembling the motor with a reduction gear according to the present invention has been described. For example, the assembly order of the worm wheel 63, the drive gear 66, and the like, and the brush holder 40, the connector member 50, and the like can be changed as appropriate. Also good.

  Moreover, about the structure of each part of the motor with a reduction gear, it is possible to change suitably. For example, the brush holder 40 urges the brush 43 toward the commutator 35 by the spring 44, but it may be urged by a leaf spring or the like instead of the spring 44.

Further, the speed reducer portion 60 of the motor 1 with a speed reducer is provided with the first shaft 13 and the second shaft 14, but supports a gear constituting the speed reducer portion with one or more shafts. You may make it do.
Moreover, although the case where the motor with a reduction gear is applied to a drive source such as a window regulator of a vehicle has been described, the present invention is a drive source such as a wiper motor, a sunroof, and an electric seat, and further, an electrical component other than a vehicle, etc. It can be applied to various devices.

DESCRIPTION OF SYMBOLS 1 ... Motor 8 with a reduction gear ... Cover 10 ... Casing 10t ... Top surface part (one surface)
11 ... accommodation recess 12 ... shaft accommodation groove (shaft accommodation recess)
13 ... 1st axis | shaft 14 ... 2nd axis | shaft 15A, 15B ... Bearing accommodation recessed part (bearing accommodation recessed part)
15k ... positioning surface 15r ... rib 15s ... positioning rib (pressing part)
DESCRIPTION OF SYMBOLS 16 ... Motor accommodating part 30 ... Motor part 32 ... Armature 35 ... Commutator 40 ... Brush holder 43 ... Brush 50 ... Connector member 60 ... Reduction gear part 61 ... Rotary shaft 61a ... One end 61b ... Other end 62 ... Worm gear 63 ... Worm wheel ( gear)
64 ... Pinion gear (gear)
65 ... Spur Gear (Gear)
66 ... Drive gear (gear)
67A, 67B ... Bearings

Claims (8)

A rotating shaft provided with a worm gear and supported rotatably around a central axis via a plurality of bearings;
A motor unit that rotationally drives the rotating shaft around a central axis;
A speed reducer portion including at least one gear including a worm wheel meshing with the worm gear;
A shaft housing recess for housing the rotating shaft, a bearing housing recess for housing the bearing, and a casing formed with a speed reducer housing recess for housing the speed reducer portion;
The speed reducer-equipped motor, wherein the shaft housing recess, the bearing housing recess, and the speed reducer housing recess are open on one side of the casing. The rotating shaft is provided with a commutator constituting the motor unit,
The motor with a reduction gear according to claim 1, wherein a motor housing portion that houses the commutator of the motor portion is formed in the casing so as to open to the one surface side. A brush holder for holding a brush in sliding contact with the outer peripheral surface of the commutator;
The motor with a reduction gear according to claim 2, wherein the brush holder is fixed to the motor housing portion. On one surface side of the casing, a cover that covers the shaft housing recess, the bearing housing recess, the speed reducer housing recess, and the motor housing is provided,
The motor with a reduction gear according to claim 3, wherein the brush holder is provided integrally with the cover.   The said bearing accommodation recessed part is equipped with the elastically deformable rib which protrudes in the said bearing side in the position orthogonal to the said one surface side, and facing the radial direction outer side of the said bearing. The motor with a reduction gear as described in any one of these. At least two of the bearings are provided at intervals in the central axis direction of the rotating shaft,
The bearing housing recess for housing one of the bearings is formed on one side in the rotational axis direction, and a positioning surface against which one surface of the bearing abuts,
The motor with a reduction gear according to claim 1, further comprising: a pressing portion that is formed on the other side in the rotation axis direction and presses the bearing toward the positioning surface.   The motor with a reduction gear according to any one of claims 1 to 6, wherein a width dimension in the shaft accommodating recess is smaller than a width dimension in a direction perpendicular to the rotation axis in the bearing accommodating recess. It is an assembly method of the motor with a reduction gear according to any one of claims 1 to 7,
The gears constituting the rotating shaft, the bearing, and the speed reducer portion are incorporated from the one surface side with respect to the shaft receiving recess, the bearing receiving recess, and the speed reducer receiving recess that are opened on one surface side of the casing. A method of assembling a motor with a speed reducer.

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