JP2011114887A - Geared motor and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geared motor which can reduce its parts count and manhour. <P>SOLUTION: A gear housing 20 includes a bottomed cylindrical wheel storage 20b which houses a worm wheel 22 and a cover 23a which blocks the opening 28 of this wheel storage 20b. A supporting shaft, consisting of a wheel support 30 and a plate support 31, is integrated with the cover 23a. Moreover, the supporting shaft is made in hollow cylindrical form. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a geared motor in which a motor part and a speed reducing part that decelerates the rotation of the motor part are assembled together, and a manufacturing method of the geared motor.

2. Description of the Related Art Conventionally, there has been known a geared motor that decelerates rotation of a rotating shaft driven by a motor unit by a worm wheel of a reduction unit and transmits the rotation to an output gear (see, for example, Patent Document 1).
In the geared motor of Patent Document 1, the rotating shaft of the motor unit is connected to the worm shaft accommodated in the shaft housing portion of the gear housing, and the drive of the worm shaft is accommodated in the wheel housing portion of the gear housing. It is to be transmitted. Then, for example, a window regulator that opens and closes the window glass is operated by an output gear that rotates integrally with the worm wheel.

JP 2006-320151 A

  By the way, in said geared motor, the end of the support shaft part which supports a worm wheel and an output gear is embed | buried under the center of the bottom part of a wheel accommodating part. That is, in the above geared motor, it is necessary to mold the gear housing with the support shaft fixed to the molding die when molding the gear housing composed of the wheel housing portion and the shaft housing portion. Further increases in assembly man-hours are required, and further improvements are desired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a geared motor and a geared motor manufacturing method capable of reducing the number of parts and man-hours.

  In order to solve the above-described problem, the invention according to claim 1 is a geared motor in which a motor unit and a speed reduction unit are integrally assembled, and the speed reduction unit includes a support shaft portion housed in a housing; A worm wheel that is inserted into the support shaft portion and is rotatably supported and decelerates rotation from the motor portion, a rotation transmission member coupled to the worm wheel so as to be integrally rotatable, and the rotation transmission member, An output member coupled so as to be integrally rotatable, and the rotation of the motor unit is driven and transmitted to the output member, the housing having a bottomed cylindrical wheel housing portion that houses a worm wheel And a cover portion that closes the opening of the wheel housing portion, and the support shaft portion is integrally formed with the cover portion and the wheel housing portion. Through the through-hole formed in part as its gist in that it is arranged to protrude outside of the wheel housing portion.

  In this invention, a housing is provided with the bottomed cylindrical wheel accommodating part which accommodates a worm wheel, and the cover part which obstruct | occludes the opening part of this wheel accommodating part. The support shaft portion is integrally formed with the cover portion and is configured to protrude through the through-hole formed in the bottom portion of the wheel housing portion to the outside of the wheel housing portion. As described above, since the support shaft portion is integrally formed with the cover portion in advance, the number of parts can be reduced. For example, the assembly work of fixing the support shaft portion to the cover portion can be omitted, and the number of assembly steps can be reduced. Can be planned.

The invention according to claim 2 is the geared motor according to claim 1, wherein the support shaft portion is formed in a hollow cylindrical shape.
In this invention, since the support shaft portion is formed in a hollow cylindrical shape, the weight of the support shaft portion can be reduced, which can contribute to the weight reduction of the entire motor.

  According to a third aspect of the present invention, in the geared motor according to the first or second aspect, the support shaft portion includes a first support portion that rotatably supports the output member and the rotation transmission member, and the first support portion. The gist of the present invention is to have a second support portion having a larger diameter and rotatingly supporting the worm wheel.

  In this invention, the 2nd support part which rotationally supports a worm wheel is made larger diameter than the 1st support part which rotationally supports an output member and a rotation transmission member in a support shaft part. For this reason, the intensity | strength as a support shaft part with respect to the load to the radial direction added to a worm wheel can be raised, for example. Further, since the strength of the second support portion on the cover portion side can be increased, the strength as the cover portion can be ensured.

The gist of a fourth aspect of the present invention is the geared motor according to any one of the first to third aspects, wherein the output member is integrally formed with the rotation transmission member.
In this invention, since the output member is integrally formed with the rotation transmission member, an increase in the number of parts can be suppressed.

  Invention of Claim 5 is a manufacturing method of the geared motor as described in any one of Claims 1-4, Comprising: In the said support shaft part integrally molded by the said cover part, the said worm wheel, the said The gist of the invention is to attach the rotation transmitting member and the output member, assemble them from the opening side of the wheel accommodating portion in a state where they are attached, and close the opening portion with the cover portion.

  In this invention, the worm wheel, the rotation transmission member, and the output member are attached to the support shaft portion integrally formed with the cover portion, and the cover portion is assembled from the opening side of the wheel housing portion in a state in which they are attached. The opening is closed at. That is, various members such as a worm wheel can be assembled to the wheel accommodating portion only from the opening side of the wheel accommodating portion, which can contribute to a reduction in assembling man-hours during assembling work.

  Therefore, according to the above-described invention, it is possible to provide a geared motor and a geared motor manufacturing method capable of reducing the number of parts and man-hours.

It is a schematic block diagram of the geared motor in this embodiment. It is a disassembled perspective view of a deceleration part. It is AA sectional drawing of a deceleration part.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of the geared motor of the present embodiment. The geared motor 1 is a motor used as a drive source for a power window device mounted on a vehicle. The geared motor 1 includes a motor unit 2 and a speed reduction unit 3.

  The motor unit 2 includes a yoke housing 10 formed in a substantially bottomed flat cylindrical shape, a pair of magnets 11 fixed to the inner periphery of the yoke housing 10, and an armature 12 that is rotatably supported in the yoke housing 10. And. The armature 12 includes a rotation shaft 12a at the center thereof, and a base end portion (a lower portion in FIG. 1) of the rotation shaft 12a is rotatably supported by a bearing (not shown) assembled at the bottom center of the yoke housing 10. ing. Further, a brush (not shown) is slidably in contact with the commutator of the armature 12, and power is supplied to the brush from the outside via a connector (not shown), and the brush is supplied to the commutator. On the other hand, power is supplied. The yoke housing 10 is formed with a pair of flange portions 10a extending in the radial direction on the opening side thereof. The flange portions 10a are fixed to the gear housing 20 described later by screws (not shown). Is provided to do.

As shown in FIGS. 2 and 3, the speed reduction unit 3 includes a gear housing 20, a worm shaft 21, a worm wheel 22, a lid member 23, a rubber damper 24, and a transmission plate 25.
As shown in FIGS. 1 and 2, the gear housing 20 is orthogonal to the shaft housing portion 20a for housing the worm shaft 21 and the axial direction of the worm shaft 21 (the axis L direction of the rotating shaft 12a) from the shaft housing portion 20a. And a wheel accommodating portion 20b extending in the direction. The worm shaft 21 is drivably coupled on the same axis L as the rotating shaft 12a extending from the motor unit 2.

  As shown in FIGS. 2 and 3, the wheel accommodating portion 20b is formed in a substantially bottomed cylindrical shape, a through hole 27 is formed in the bottom portion 26, and the opening is closed in the opening portion 28 of the wheel accommodating portion 20b. The cover part 23a of the lid member 23 is attached and configured.

  The lid member 23 has a substantially disk shape so as to close the opening 28 of the wheel housing portion 20b, and is orthogonal to the axis L1 direction and the extending direction of the wheel housing portion 20b from the substantial center of the cover portion 23a. And a support shaft portion 23b extending in a direction (perpendicular to the paper surface in FIG. 1) are integrally formed by squeezing from a metal plate-like member. Further, as shown in FIG. 3, the support shaft portion 23 b has a hollow shape, and has a wheel support portion 30 having a large diameter on the cover portion 23 a side, and a wheel support portion on the tip side from the wheel support portion 30. The plate support portion 31 has a smaller diameter than the portion 30.

  The wheel support portion 30 is provided with the inner peripheral hole portion 22a of the worm wheel 22 so as to be slidable and rotatable, and the plate support portion 31 is provided with the inner peripheral hole portion 25a of the transmission plate 25 so as to be slidable and rotatable. Note that an O-ring 32 is attached to the upper surface portion 30a of the wheel support portion 30 and the base end of the plate support portion 31 to prevent intrusion of liquid such as water.

  The worm wheel 22 includes the inner peripheral hole portion 22a that is inserted into the wheel support portion 30 of the support shaft portion 23b, a substantially cylindrical boss portion 22b that forms the periphery of the inner peripheral hole portion 22a, and the worm shaft that is provided on the outer peripheral portion. 21 has a tooth portion 22c that meshes with 21 and a wheel inner recess 22d that opens in the opposite direction to the wheel housing portion 20b between the tooth portion 22c and the boss portion 22b.

  The transmission plate 25 has a substantially disk shape, and is arranged so that the outer peripheral portion 25b abuts against the inner wall surface 22e on the opening side of the in-wheel recess 22d of the worm wheel 22. The transmission plate 25 is provided with a plurality of engaging protrusions 25c (only one is shown in FIG. 2) for protrudingly engaging with the rubber damper 24 in the rotational direction on one end surface on the worm wheel 22 side. The convex portions 25c are arranged so as to alternate with engaging convex portions (not shown) of the in-wheel concave portions 22d in the rotation direction. That is, the transmission plate 25 and the worm wheel 22 are drivingly connected via the rubber damper 24 for absorbing shock. The transmission plate 25 is provided with an O-ring 33 in a concave portion 25d that is concave on the radially inner side of the transmission plate 25 that is formed at an intermediate position in the axial direction of the support shaft portion 23b. Intrusion is prevented.

  On the opposite side of the transmission plate 25 from the worm wheel 22, a serration 29 is integrally formed at the center thereof. The serration 29 is configured to be exposed from the through hole 27 of the wheel accommodating portion 20b in the assembled state, and the exposed surface 29a is press-fitted into the plate support portion 31 of the support shaft portion 23b so that the serration 29 or the like is exposed. A retaining member 35 such as a toothed washer for retaining is provided. Note that the retaining member 35 is not limited to the configuration in which the retaining is performed by press-fitting with a toothed washer, and other configurations may be employed.

  In the geared motor 1 configured as described above, the rotational drive of the rotary shaft 12 a of the motor unit 2 is decelerated by the worm shaft 21 and the worm wheel 22 and is transmitted to the serration 29. The serration 29 is drivingly connected to a pulley (not shown) used in, for example, a wire type power window device, so that a window glass (not shown) can be opened and closed.

  Incidentally, an example of a procedure for assembling the speed reduction unit 3 configured as described above is as follows. First, the worm wheel 22 is attached to the wheel support portion 30 of the support shaft portion 23 b constituting the lid member 23, and the rubber damper 24 is attached to the in-wheel recess 22 d of the worm wheel 22. Then, with the O-ring 32 attached to the base end of the plate support portion 31 of the support shaft portion 23b, the transmission plate 25 is extrapolated to the plate support portion 31, and the O-ring 32 is interposed between the plate support portion 31 and the transmission plate 25. And press-contact to act as a seal member. Then, a retaining member 35 such as a toothed washer is press-fitted into the plate support 31 to prevent rattling and retaining of the serration 29 and the transmission plate 25. And the serration 29 and the plate support part 31 are exposed from the through-hole 27 formed in the bottom part 26 of the wheel accommodating part 20b from the opening part 28 side of the wheel accommodating part 20b. Assembly is performed. At this time, the O-ring 33 attached to the transmission plate 25 acts as a seal member between the through hole 27 and the transmission plate 25. Moreover, when attaching to the wheel accommodating part 20b, the cover part 23a of the cover member 23 is attached by caulking so as to close the opening part 28 of the wheel accommodating part 20b. At this time, the wheel housing portion 20b and the cover portion 23a are sealed with a sealing agent (not shown) such as a butyl seal provided on the surface 23c of the cover portion 23a facing the wheel housing portion 20b, so that a liquid such as water can be used. Intrusion is prevented. As described above, the assembling work of the speed reduction unit 3 of the present embodiment can be performed only from the side of the opening 28 of the wheel storage unit 20b, that is, from one direction. It becomes easy to assemble each member of this, and it can contribute to the reduction of the assembly man-hour at the time of an assembly operation.

  The speed reduction portion 3 of the geared motor 1 configured as described above is configured such that the tip end portion 31a of the support shaft portion 23b is inserted into a concave portion 40a as a fixing means provided on the door panel 40 of the vehicle, for example, thereby supporting the support shaft portion 23b. It is possible to suppress the deviation and inclination in the radial direction. That is, it is possible to suppress radial displacement and inclination of the cover portion 23a with respect to the gear housing 20 (wheel housing portion 20b). The cover member 23 is integrally formed with the cover portion 23a that closes the opening 28 of the wheel housing portion 20b and the support shaft portion 23b that supports the worm wheel 22 and the like, so that the number of parts can be reduced and the number of assembling steps can be reduced. It can be done. Further, since the support shaft portion 23b of the lid member 23 is formed in a hollow cylindrical shape, it is possible to reduce the weight of the support shaft portion 23b and contribute to the weight reduction of the geared motor 1 as a whole. It has become. Further, since the wheel support portion 30 of the support shaft portion 23b is formed larger in the radial direction than the plate support portion 31, it is possible to sufficiently support the worm wheel 22 on which a relatively large force acts. Moreover, since the force which acts on each support part 30 and 31 can be disperse | distributed by the level | step difference by the difference in the diameter of the wheel support part 30 and the plate support part 31, sufficient intensity | strength can be ensured now. . The lid member 23 can be easily formed by squeezing a metal plate member. Furthermore, since the serrations 29 are integrally formed with the transmission plate 25, the number of parts can be reduced.

Next, characteristic effects of the present embodiment will be described.
(1) The gear housing 20 includes a bottomed cylindrical wheel accommodating portion 20b that accommodates the worm wheel 22, and a cover portion 23a that closes the opening 28 of the wheel accommodating portion 20b. The support shaft part 23b is formed integrally with the cover part 23a and penetrates a through hole 27 formed in the bottom part 26 of the wheel accommodating part 20b so as to protrude to the outside of the wheel accommodating part 20b. As described above, since the support shaft portion 23b is integrally formed with the cover portion 23a in advance, the number of parts can be reduced, and an assembly work such as fixing the support shaft portion 23b to the cover portion 23a can be omitted. Can also be reduced.

  (2) The support shaft portion 23b is held by a recess 40a serving as a holding means for restricting the movement of the support shaft portion 23b in the radial direction on the outer side of the gear housing 20 (wheel housing portion 20b). Therefore, even if a reverse rotation load is applied to the serration 29 as the output member, the movement of the support shaft portion 23b in the radial direction is restricted, and the support shaft portion 23b can be prevented from tilting. It becomes possible.

(3) Since the support shaft portion 23b is formed in a hollow cylindrical shape, the support shaft portion 23b can be reduced in weight, and the motor 1 as a whole can be reduced in weight.
(4) The wheel support portion 30 as the second support portion for rotating and supporting the worm wheel 22 has a larger diameter than the plate support portion 31 for rotating and supporting the serration 29 and the transmission plate 25 as the rotation transmission member in the support shaft portion 23b. It is said. For this reason, the intensity | strength as the support shaft part 23b with respect to the load to the radial direction added to the worm wheel 22, for example can be raised. Moreover, since the strength of the wheel support portion 30 on the cover portion 23a side can be increased, the strength as the cover portion 23a can be ensured.

  (5) Since the serration 29 is integrally formed on the transmission plate 25, an increase in the number of parts can be suppressed. Further, the transmission plate 25 is prevented from being detached from the support shaft portion 23b by bringing the transmission plate 25 and the through hole 27 into contact with each other in the axial direction of the support shaft portion 23b. Further, it is possible to prevent the serration 29 from coming off from the support shaft portion 23b.

  (6) The worm wheel 22, the transmission plate 25, and the serration 29 are attached to the support shaft portion 23b formed integrally with the cover portion 23a, and assembled from the opening portion 28 side of the wheel accommodating portion 20b with these attached. The opening portion 28 is closed by the cover portion 23a. That is, various members such as the worm wheel 22 can be assembled to the wheel accommodating portion 20b only from the opening 28 side of the wheel accommodating portion 20b, which can contribute to a reduction in the number of assembling steps during assembling work. .

In addition, you may change embodiment of this invention as follows.
-In above-mentioned embodiment, although the transmission plate 25 and the serration 29 as an output member were integrally molded, a separate body may be sufficient.

  In the above embodiment, the serration 29 is used as the output member. However, for example, a configuration using a pinion gear used as an output member in a motor of an X arm type power window device may be used.

In the above embodiment, the cover member 23 in which the cover portion 23a and the support shaft portion 23b are integrally formed is configured by a metal member, but may be configured by, for example, a resin member.
In the above-described embodiment, the invention is embodied in the motor of the power window device. However, the invention is not limited to this. For example, the invention may be applied to a wiper motor or other motors.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) The geared motor according to any one of claims 1 to 4, wherein the geared motor is used for a power window device or a wiper device.

Thus, even if it uses for a power window apparatus and a wiper apparatus, there can exist an effect similar to the effect as described in any one of Claims 1-4.
(B) The geared motor according to any one of claims 1 to 4 and (A), and a holding means for restricting radial movement on the tip side of the support shaft portion, Motor device.

  Thereby, the motor apparatus which can show | play the effect similar to the effect as described in any one of Claims 1-4 and said (A) can be provided.

  DESCRIPTION OF SYMBOLS 1 ... Geared motor, 2 ... Motor part, 3 ... Reduction part, 20 ... Gear housing as housing, 20b ... Wheel housing part, 22 ... Worm wheel, 23a ... Cover part, 23b ... Support shaft part, 25 ... Rotation transmission member Transmission plate as 26, bottom part, 27 through hole, 28 opening, 29 serration as output member, 30 wheel support part as second support part, 31 plate support part as first support part , 31a... Tip portion, 40a.

Claims (5)

In a geared motor in which a motor part and a speed reduction part are assembled together,
The deceleration part is
A support shaft housed in the housing;
A worm wheel that is fitted into the support shaft portion and is rotatably supported and decelerates rotation from the motor portion;
A rotation transmission member coupled to the worm wheel so as to be integrally rotatable;
An output member coupled to the rotation transmission member so as to be integrally rotatable;
The rotation of the motor unit is transmitted to the output member,
The housing includes a bottomed cylindrical wheel accommodating portion that accommodates a worm wheel, and a cover portion that closes an opening of the wheel accommodating portion,
The support shaft portion is formed integrally with the cover portion and penetrates a through hole formed in a bottom portion of the wheel housing portion so as to protrude to the outside of the wheel housing portion. motor. The geared motor according to claim 1, wherein
The geared motor, wherein the support shaft portion is formed in a hollow cylindrical shape. The geared motor according to claim 1 or 2,
The support shaft portion includes a first support portion that rotatably supports the output member and the rotation transmission member, and a second support portion that is larger in diameter than the first support portion and rotatably supports the worm wheel. Features a geared motor. In the geared motor as described in any one of Claims 1-3,
The geared motor, wherein the output member is integrally formed with the rotation transmission member. It is a manufacturing method of the geared motor as described in any one of Claims 1-4,
The worm wheel, the rotation transmission member, and the output member are attached to the support shaft portion formed integrally with the cover portion, and assembled from the opening side of the wheel housing portion in a state in which they are attached, A method for manufacturing a geared motor, wherein the opening is closed by a cover.

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