JP2012115054A - Gear housing for motor, and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear housing for a motor capable of enhancing rigidity of a supporting cylinder part at low cost and supporting an output axis stiffly.SOLUTION: A gear housing 11 for a motor is fixed to a motor main body rotating and driving a rotation axis, houses a worm and a worm wheel 12 coupled with the rotation axis, and has a cylindrical supporting cylinder part 11j for supporting an output axis 13 rotating integrally with the worm wheel 12. The supporting cylinder part 11j consists of an outer cylinder part 11k protruding from a bulging end wall part 11i toward outside, and an inner cylinder part 11l protruding from the bulging end wall part 11i toward inside and connected with the outer cylinder part 11k.

Description

  The present invention relates to a motor gear housing and a motor.

  2. Description of the Related Art Conventionally, a motor used as a drive source for a vehicle wiper device or the like includes a motor body that rotationally drives a rotating shaft, and a speed reducer that decelerates and outputs the rotation of the rotating shaft. The reduction unit includes a gear housing fixed to the motor body, a reduction gear (worm and worm wheel) housed in the gear housing, an output shaft that protrudes outward from the gear housing and rotates integrally with the reduction gear (worm wheel). Is provided. In addition, a support cylinder portion that protrudes outside in a cylindrical shape is formed on one side surface of the gear housing to support the output shaft, and the output shaft of the reduction gear (worm wheel) is cantilevered (for example, Patent Documents). 1 and Patent Document 2). In the gear housing, reinforcing ribs extending radially are formed on the outer peripheral side of the support cylinder portion. In such a gear housing, the ribs increase the rigidity of the support cylinder portion, and when a force in the direction perpendicular to the axis (reaction force from the load side) is applied to the supported output shaft, the force can be received. It is configured to ensure rigidity.

JP 2009-225505 A JP 2005-137092 A

  By the way, when the support cylinder portion of the gear housing as described above receives a force in the direction perpendicular to the axis (reaction force from the load side) applied to the output shaft, the support cylinder portion largely protrudes from one side surface of the gear housing. Since it is a structure, especially big force will be applied to the base end and front-end | tip of the support cylinder part. Therefore, in order to ensure the rigidity of the support cylinder, for example, it is necessary to increase the scale of the ribs that reinforce the support cylinder (for example, increase the number or increase the thickness), and the material and weight There is a problem that it increases and becomes expensive.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor that can increase the rigidity of the support cylinder portion with an inexpensive configuration and can firmly support the output shaft. A gear housing and a motor are provided.

  According to the first aspect of the present invention, the cylindrical body is fixed to the motor body that rotationally drives the rotation shaft, accommodates the reduction gear connected to the rotation shaft, and supports the output shaft that rotates integrally with the reduction gear. A support gear portion of the motor, wherein the support tube portion includes an outer tube portion projecting outward from the housing wall portion, and an inner tube projecting inward from the housing wall portion and communicating with the outer tube portion. The gist is to have a cylindrical portion.

  According to the same configuration, the support cylinder part for supporting the output shaft includes an outer cylinder part protruding outside from the housing wall part, and an inner cylinder part protruding inward from the housing wall part and communicating with the outer cylinder part. Therefore, it is possible to increase the rigidity as compared with the support cylinder portion that supports the output shaft having the same length as the output shaft supported by the outer cylinder portion and the inner cylinder portion by projecting only from the housing wall portion to the outside. And can firmly support the output shaft. That is, it is necessary for the support cylinder portion to secure rigidity capable of receiving the force in the direction perpendicular to the axis (reaction force from the load side) applied to the output shaft, and in particular, a large force is applied to the base end and the distal end of the support cylinder portion. Will be applied. Further, in the support cylinder part that is supported only by projecting greatly from the housing wall part to the outside, it is necessary to enlarge the ribs that reinforce the support cylinder part in order to ensure rigidity. In the configuration having the inner cylinder part, both the outer cylinder part and the inner cylinder part need only have a small amount of protrusion from the housing wall part, so that the rigidity of the support cylinder part can be ensured without increasing the size of the rib. Therefore, for example, even when a rib that reinforces the support tube portion is provided, the output shaft can be firmly supported by downsizing the rib (for example, reducing the number or reducing the thickness), and thus The material and weight of the gear housing can be reduced and the gear housing can be made inexpensive.

  According to a second aspect of the present invention, in the motor gear housing according to the first aspect, the housing wall portion is a bulging portion formed to bulge outwardly so as to widen the internal space from one side surface of the gear housing. The gist is the bulging end wall.

  According to this configuration, the housing wall portion is a bulging end wall portion of the bulging portion that is bulged outwardly so as to widen the inner space from one side surface of the gear housing. It is possible to provide the inner cylinder part and further other configurations and members inside the housing space while securing the housing space.

According to a third aspect of the present invention, in the motor gear housing according to the second aspect, the side wall portion of the bulging portion and the inner cylindrical portion are connected by a plurality of internal ribs.
According to this configuration, since the side wall portion of the bulging portion and the inner cylinder portion are connected by the plurality of internal ribs (in the internal space expanded by the bulging portion), the rigidity of the inner cylinder portion and the side wall portion is increased. Get higher. In addition, when ribs are provided outside the housing to reinforce the support cylinder portion, for example, water may be accumulated in a portion surrounded by the ribs, but this is avoided with the internal ribs.

  According to a fourth aspect of the present invention, in the gear housing of the motor according to the second or third aspect, on one side surface, three mounting feet for fixing to the mounting member protrude with a distance from each other. The gist of the formed side wall portion of the bulging portion is a connecting wall portion that connects the mounting foot portions in an annular shape.

  According to this configuration, the side wall portion of the bulging portion is a connecting wall portion that connects the three mounting feet for fixing to the mounting member in an annular shape, so that the rigidity of the side wall portion and the mounting foot portion is mutually It will be enhanced through collaboration.

  According to a fifth aspect of the present invention, in the motor gear housing according to any one of the first to fourth aspects, bearings that support the output shaft are spaced apart from the inner peripheral surfaces of both ends of the support cylinder portion. The gist is that it was provided.

  According to this configuration, since the bearings that support the output shaft are provided separately on the inner peripheral surfaces on both ends of the support cylinder portion and no bearing is provided in the intermediate portion, the intermediate portion (between the bearings) A space for storing lubricating oil can be provided, and for example, scattering of the lubricating oil that expands at high temperatures can be reduced.

The invention according to claim 6 is summarized in a motor including the gear housing of the motor according to any one of claims 1 to 5, the reduction gear, and the motor body.
According to this configuration, in the motor, the effect of the invention according to any one of claims 1 to 5 can be obtained, the output shaft can be firmly supported, and the gear housing material and weight can be reduced. It can be reduced and made inexpensive.

  ADVANTAGE OF THE INVENTION According to this invention, the rigidity of a support cylinder part can be made high with an inexpensive structure, and the gear housing and motor of a motor which can support an output shaft firmly can be provided.

1 is a side view of a motor in the present embodiment. (A) The perspective view of the one side surface of the gear housing in this Embodiment. (B) One side view of a gear housing. (A) The perspective view of the other side surface side of the gear housing in this Embodiment. (B) The other side view of a gear housing similarly. (A) Sectional drawing corresponding to the AA line in FIG.2 (b). (B) Sectional drawing corresponding to the BB line in FIG.2 (b).

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the motor 1 is used as a drive source of a vehicle wiper device that wipes raindrops and the like adhering to the windshield of the vehicle, and includes a motor body 2 and a speed reduction unit 3. .

  The motor body 2 includes a substantially bottomed cylindrical yoke 4, a magnet 5 fixed to the inner periphery of the yoke 4, and an armature 6 housed in the yoke 4, and rotationally drives the armature 6. As for the rotating shaft 7 of the armature 6, the front end side protrudes from the yoke 4, and the worm 8 is formed in the front end side.

  The speed reducer 3 includes a gear housing 11, a housing cover (not shown) that closes an opening 11a (see FIG. 3) of the gear housing 11, a worm wheel 12 that is housed in the gear housing 11 and meshed with the worm 8, And an output shaft 13 provided to rotate integrally with the worm wheel 12. In the present embodiment, the worm 8 and the worm wheel 12 constitute a reduction gear.

  Specifically, the gear housing 11 is formed by die casting an aluminum alloy. As shown in FIGS. 1 to 3, the gear housing 11 extends along the rotation shaft 7 of the motor main body 2 and accommodates the worm 8 and communicates with the worm housing 11 b to accommodate the worm 8. A wheel housing portion 11c for housing the worm wheel 12 to be engaged.

  Further, on one side surface of the gear housing 11 (the surface on the side shown in FIG. 2B, the surface on which the output shaft 13 protrudes to the outside, that is, the surface opposite to the wheel housing portion 11c). Are formed with three mounting feet 11d for fixing to a mounting member (vehicle body or the like) (not shown) of the vehicle protruding from each other with a gap therebetween. Each attachment foot 11d is formed in a substantially cylindrical shape. In addition, the mounting foot portion 11d of the present embodiment has a substantially equilateral triangular shape with the position corresponding to the position where the worm 8 and the worm wheel 12 are engaged as one vertex, with the position corresponding to the output shaft 13 as the center. It is provided at a position to be the apex.

  Further, as shown in FIGS. 2A and 2B, a bulging portion 11e bulging outward is formed on one side surface of the gear housing 11 so as to widen the internal space. A side wall portion (wall portion extending along the bulging direction) 11f of the bulging portion 11e is seen from the projecting direction of the mounting foot portion 11d (see FIG. 2B), and the three mounting foot portions 11d are annularly formed. While connecting, it arrange | positions so that the triangle which uses the three attachment leg parts 11d as a vertex may be formed, and comprises the connection wall part which connects the attachment leg parts 11d. In the present embodiment, as shown in FIG. 2, a positioning bulging portion 11g bulging outward from the triangle is formed on a part of the side wall portion 11f. A concave portion 11h for positioning is formed in 11g. In addition, a cylindrical support cylinder portion 11j described later is formed at the center position of an inscribed circle of a substantially equilateral triangle with the three attachment feet 11d as vertices so that the axes thereof coincide with each other.

  Further, in the bulging end wall portion (plate-shaped portion forming the bulging end surface) 11i of the bulging portion 11e, the center of the wheel housing portion 11c communicates with the inside and outside of the gear housing 11, and the output A cylindrical support tube portion 11j for supporting the shaft 13 is formed. In the present embodiment, the bulging end wall portion 11i constitutes the housing wall portion.

  Here, as shown in FIGS. 2 (a), 3 (a), and 4 (b), the support cylinder portion 11j of the present embodiment is an outer cylinder that protrudes outward from the bulging end wall portion 11i. A portion 11k and an inner cylinder portion 11l projecting inward from the bulging end wall portion 11i and communicating with the outer cylinder portion 11k.

  As shown in FIGS. 4A and 4B, bearings 14a and 14b for supporting the output shaft 13 are provided apart (in the axial direction) on the inner peripheral surfaces of both ends of the support cylinder portion 11j. The output shaft 13 of the worm wheel 12 constituting the reduction gear is cantilevered. The bearings 14a and 14b are oil-impregnated bearings made of sintered metal.

  Further, the side wall portion 11f and the inner cylindrical portion 11l of the bulging portion 11e are formed of a plurality of internal ribs 11m as shown in FIGS. 3 (a) and 3 (b) and FIGS. 4 (a) and 4 (b). , 11n. The internal ribs 11m and 11n of the present embodiment include an internal rib 11m extending from the inner cylindrical portion 11l toward a position (each vertex of the triangle) corresponding to each mounting foot 11d (see FIG. 2), and the inner cylindrical portion. 11l and an internal rib 11n extending toward the center position (each center of each side of the triangle) between the mounting feet 11d. The internal ribs 11m and 11n are formed upright from the bulging end wall portion 11i so as to connect the side wall portion 11f and the inner cylinder portion 11l.

Next, characteristic effects of the above embodiment will be described below.
(1) The support cylinder part 11j for supporting the output shaft 13 protrudes to the outside from the bulging end wall part 11i (housing wall part) and the bulging end wall part 11i to the inside. An inner cylinder portion 11l communicating with the outer cylinder portion 11k. That is, the bulging end wall portion 11i of the bulging portion 11e is connected at the intermediate position in the protruding direction of the support cylinder portion 11j. Therefore, a support cylinder part that supports the output shaft having the same length as the output shaft 13 supported by the outer cylinder part 11k and the inner cylinder part 11l by projecting only from the bulging end wall part 11i (housing wall part) to the outside. As compared with the above, the rigidity can be increased and the output shaft 13 can be firmly supported. That is, it is necessary for the support cylinder portion 11j to secure rigidity capable of receiving the force in the direction perpendicular to the axis (reaction force from the load side) applied to the output shaft 13, and particularly the base end and the tip end of the support cylinder portion 11j. A great deal of power will be applied. And, in order to ensure rigidity in the support cylinder part that is protruded and supported only greatly from the bulging end wall part 11i (housing wall part), it is necessary to enlarge the rib for reinforcing the support cylinder part. In the configuration in which the support tube portion 11j includes the outer tube portion 11k and the inner tube portion 11l, the outer tube portion 11k and the inner tube portion 11l both require a small amount of protrusion from the bulging end wall portion 11i. The rigidity of the support cylinder portion 11j can be ensured without increasing the scale. Therefore, for example, even when the internal ribs 11m and 11n that reinforce the support cylinder portion 11j (inner cylinder portion 11l) are provided as in the present embodiment, the ribs are reduced in size (for example, the number is reduced or the thickness is reduced). The output shaft 13 can be firmly supported, and thus the material and weight of the gear housing 11 can be reduced and the output shaft 13 can be made inexpensive.

  (2) The bulging end wall of the bulging portion 11e formed so that the housing wall portion serving as the base portion of the outer cylinder portion 11k and the inner cylinder portion 11l bulges outward from the one side surface of the gear housing 11 Since this is the portion 11i, the internal space is widened and the accommodation space for the reduction gear (worm 8 and worm wheel 12) is secured, while the inner cylindrical portion 11l and other configurations (in the present embodiment) It is possible to provide internal ribs 11m, 11n) and members.

  (3) Since the side wall part 11f of the bulging part 11e and the inner cylinder part 11l are connected by a plurality of internal ribs 11m and 11n (in the inner space expanded by the bulging part 11e), the inner cylinder part 11l and The rigidity of the side wall portion 11f is increased. Further, when a rib is provided outside the housing to reinforce the support cylinder portion 11j, for example, water may be collected in a portion surrounded by the rib. However, in the internal ribs 11m and 11n, Avoided.

  (4) Since the side wall part 11f of the bulging part 11e is a connecting wall part that connects the three attachment leg parts 11d for fixing to the attachment member in an annular shape, the rigidity of the side wall part 11f and the attachment leg part 11d Will be enhanced in cooperation with each other. Further, in the above embodiment, the side wall portion 11f connects the mounting foot portions 11d so that a triangle having the three mounting foot portions 11d as vertices is formed, so that the three mounting foot portions 11d are linear. It will be connected in the shortest distance. Therefore, for example, compared to the case where the attachment feet 11d are connected to form an annular shape, the material and weight can be reduced while increasing the rigidity of the attachment feet 11d.

  (5) Since the bearings 14a and 14b that support the output shaft 13 are provided apart from each other on the inner peripheral surfaces of both ends of the support cylinder portion 11j, for example, the material cost can be reduced without providing a bearing in vain. it can. That is, since the bearings 14a and 14b are provided only on both end sides where the large force is applied to the support cylinder portion 11j (that is, excluding the intermediate portion), the bearings are provided in the entire axial direction (including the intermediate portion) of the support cylinder portion 11j. For example, the material cost can be reduced without wastefully providing a bearing. In addition, since no bearing is provided in the intermediate portion of the support cylinder portion 11j, a space can be provided in the intermediate portion (between the bearings 14a and 14b), for example, for lubricating oil that expands at high temperatures. Spattering can be reduced.

  (6) Since the internal ribs 11m and 11n include those extending from the inner cylinder part 11l toward the position corresponding to the attachment leg part 11d (that is, the internal rib (vertical rib) 11m), the inner cylinder part 11l and the attachment leg part Both the rigidity of 11d can be made higher.

  (7) Since the internal ribs 11m and 11n include those extending from the inner cylindrical portion 11l toward the center position between the mounting feet 11d (that is, the internal rib (opposite side rib) 11n), The rigidity of both the protruding portions 11e (the bulging end wall portions 11i and the side wall portions 11f) can be increased with good balance.

The above embodiment may be modified as follows.
In the above-described embodiment, the bulging portion 11e that bulges the housing wall portion, which is the base portion of the outer cylinder portion 11k and the inner cylinder portion 11l, to the outside so as to widen the internal space from one side surface of the gear housing 11. However, the present invention is not limited to this, and the wall portion of the gear housing that does not bulge may be used as the housing wall portion. That is, the wall portion including one side surface in the gear housing in which the bulging portion 11e and the internal ribs 11m and 11n are not formed is used as a housing wall portion from the housing wall portion to the outer cylinder portion 11k and the inner cylinder portion. 11l may be formed to protrude. Even if it does in this way, the effect similar to the effect (1) of the said embodiment can be acquired.

  In the above embodiment, the side wall portion 11f and the inner cylinder portion 11l of the bulging portion 11e are connected by the plurality of internal ribs 11m and 11n. However, the present invention is not limited to this, and the internal ribs 11m and 11n It is good also as a structure which is not connected. Moreover, you may provide the external rib for reinforcing the outer cylinder part 11k in the outer side of the bulging part 11e (bulging end wall part 11i).

  In the above embodiment, the side wall portion 11f of the bulging portion 11e is a connecting wall portion that connects the three mounting foot portions 11d for fixing to the mounting member in an annular shape, but is not limited thereto. For example, it is good also as a shape which does not connect attachment foot part 11d cyclically | annularly. In the above embodiment, the side wall portion 11f connects the mounting foot portions 11d so that a triangle with the three mounting foot portions 11d as vertices is formed, but the mounting foot portions 11d are formed in an annular shape. It is good also as a connection wall part to connect, ie, it is good also as a bulging part bulging and formed in the column shape (concentric with the support cylinder part 11j) toward the exterior side.

  In the above embodiment, the bearings 14a and 14b that support the output shaft 13 are provided separately on both ends of the support cylinder portion 11j. However, the present invention is not limited to this, and the axial direction of the support cylinder portion 11j A bearing may be provided throughout.

  In the above-described embodiment, the internal ribs 11m and 11n include the internal ribs (vertex ribs) 11m extending from the inner cylindrical part 11l toward the positions corresponding to the mounting feet 11d (the respective apexes of the triangle), and the inner cylinder The internal ribs (opposite side ribs) 11n extending from the portion 11l toward the center position between the mounting feet 11d (each center of each side of the triangle) are provided. However, the configuration thereof may be changed. . For example, it is good also as a structure which is not provided with the internal rib (vertex rib) 11m extended toward the position (each vertex of the said triangle) corresponding to each attachment leg part 11d, and the center position ( It is good also as a structure which is not provided with the internal rib (opposite side rib) 11n extended toward each center of the said triangle, and you may provide an internal rib in the position different from the said internal ribs 11m and 11n.

  In the above embodiment, the motor 1 is used as a drive source for the vehicle wiper device, but is not limited to this. For example, the motor 1 may be used as a drive source for a power window device. It may be a motor.

  DESCRIPTION OF SYMBOLS 2 ... Motor main body, 7 ... Rotating shaft, 8 ... Worm which comprises a part of reduction gear, 11d ... Mounting foot part, 11e ... Expansion part, 11f ... Side wall part (connection wall part), 11i ... Expansion end wall Part (housing wall part), 11j ... support cylinder part, 11k ... outer cylinder part, 11l ... inner cylinder part, 11m, 11n ... internal rib, 12 ... worm wheel constituting a part of the reduction gear, 13 ... output shaft, 14a, 14b ... bearings.

Claims (6)

A gear of a motor that is fixed to a motor main body that rotationally drives the rotation shaft, accommodates a reduction gear coupled to the rotation shaft, and has a cylindrical support tube portion for supporting an output shaft that rotates integrally with the reduction gear. A housing,
The support cylinder portion includes an outer cylinder portion protruding outward from a housing wall portion, and an inner cylinder portion protruding inward from the housing wall portion and communicating with the outer cylinder portion. . The gear housing of the motor according to claim 1,
The gear housing of a motor, wherein the housing wall portion is a bulging end wall portion of a bulging portion bulging outwardly so as to widen an internal space from one side surface of the gear housing. The gear housing of the motor according to claim 2,
The motor gear housing, wherein the side wall portion of the bulging portion and the inner cylinder portion are connected by a plurality of internal ribs. In the gear housing of the motor according to claim 2 or 3,
On the one side surface, three attachment feet for fixing to the attachment member are respectively formed protruding with a gap,
The motor gear housing according to claim 1, wherein a side wall portion of the bulging portion is a connecting wall portion that connects the mounting feet in an annular shape. In the gear housing of the motor according to any one of claims 1 to 4,
A gear housing for a motor, wherein bearings for supporting the output shaft are provided apart from each other on inner peripheral surfaces on both ends of the support cylinder portion.   A motor comprising the gear housing of the motor according to any one of claims 1 to 5, the reduction gear, and the motor main body.

Images