JP5634274B2 - Casing structure and motor - Google Patents

Description

  The present invention relates to a casing structure such as a motor that houses a reduction gear and a motor.

  Conventionally, a motor or the like used in a vehicle wiper device or the like has a motor body and a gear portion. The gear part accommodates electric parts, such as a reduction gear and various terminals, inside the housing and a cover that closes the opening of the housing. And as such a motor (its casing structure), a part of earth terminal (joint connection part) as an electrical component provided in the cover made of an electrically insulating resin material is connected to both edges of the housing and the cover ( There are some which are connected to a housing made of a conductive metal material by being sandwiched between the parts to be fastened (for example, see Patent Document 1). Specifically, the housing and the cover are fastened and fixed by screws that pass through holes formed in the edge of the cover and are screwed into holes (female screw holes) formed in the edge of the housing. There is one in which a ground terminal is electrically connected to a housing by clamping (co-fastening) a part around the screw at both edges. Further, in this casing structure, a seal groove is formed at the edge of the cover, and the seal groove is formed so as to bypass the outside of the joint connection portion of the ground terminal, and is interposed between the seal groove and the housing. By disposing the sealing member to be allowed to enter, the liquid can be prevented from entering the inside.

JP-A-2005-67421

  However, in the casing structure as described above, since the seal groove and the seal member are arranged so as to bypass the outside of the joint fastening connection portion, for example, the position of the joint fastening connection portion is transmitted along the fastening member by capillary action or the like. If the water (liquid) enters, the water (liquid) may further enter the inside through the first casing and the second casing (earth terminal).

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a casing structure and a motor that can reduce the ingress of liquid into the inside.

  In the first aspect of the present invention, the edge portions of the first casing made of the conductive metal material and the second casing made of the electrically insulating resin material are combined, and the fastened portion formed at a predetermined position of the edge portion. A fastening member is inserted and the first and second casings are fastened and fixed to each other, and a joint fastening portion formed on an earth terminal provided in the second casing is around the fastening member by the fastening and fixing. A casing structure that is fastened so as to be electrically connected to the first casing, and a sealing member interposed between the mating surfaces with the first casing is disposed at an edge of the second casing. A seal groove is formed, and the seal groove passes through between the joint fastening portion and the inner side of the second casing and crosses the earth terminal. And summary to include.

  According to this configuration, the seal groove that is formed at the edge of the second casing and is disposed between the mating surfaces with the first casing includes the joint fastening portion and the inner side of the second casing. Including a transverse groove formed so as to pass through the ground terminal and between the first casing and the second casing, water (liquid) can be reduced from entering the inner side from the fastening and fixing portion. . That is, since the seal member is disposed in the seal groove including the transverse groove formed so as to pass between the joint fastening connection portion and the inner side of the second casing and cross the ground terminal, for example, the joint member is transmitted along the fastening member. Even if water (liquid) enters the position of the tightening connection portion, the water (liquid) is prevented from entering the inner side through the first casing and the second casing. Since the seal member is disposed in the seal groove including the transverse groove, the seal member is tightened together, for example, when the seal member is arranged on the exposed ground terminal (plane) without providing the transverse groove. It is prevented that the electrical connection between the connecting portion and the first casing is hindered. Specifically, for example, when a sealing member is arranged on a ground terminal (plane) that is simply exposed without providing a transverse groove, the sealing member spreads due to the pressure of the first casing, and between the joint fastening connection portion and the first casing. However, it is possible to avoid this, although the contact area may be reduced and the contact area may be reduced to hinder the electrical connection. Therefore, the electrical connection to the 1st casing of a joint fastening connection part is securable.

  According to a second aspect of the present invention, in the casing structure according to the first aspect, the ground terminal is provided such that an intermediate portion is embedded in the second casing and exposed at an edge of the second casing. The joint fastening portion is formed through the exposed portion, and the transverse groove is a terminal groove formed in the exposed portion.

  According to this configuration, the ground terminal has an intermediate portion embedded in the second casing, but the joint connection portion is exposed together with the exposed portion through the exposed portion provided to be exposed at the edge thereof. Since the transverse groove is a terminal groove formed in the exposed portion of the ground terminal, it is particularly between conductive metal materials where a slight gap is likely to occur (between the ground terminal and the first casing). ) Can prevent water (liquid) from entering the inside.

  According to a third aspect of the present invention, in the casing structure according to the first aspect, the ground terminal is embedded so that an intermediate portion is embedded in the second casing and is not exposed at an edge of the second casing. The joint fastening portion is exposed and formed through the buried portion, and the transverse groove is a transverse molding groove formed in the second casing at a position corresponding to the buried portion. .

  According to this configuration, the ground terminal has the intermediate portion embedded in the second casing, but the joint connection portion is formed in an exposed state via the embedded portion embedded so as not to be exposed at the edge thereof. In addition, since the transverse groove is a transversely formed groove formed in the second casing at a position corresponding to the buried portion, the seal groove including the transverse groove (transversely formed groove) can be easily formed without any breaks or steps. Can be molded. Therefore, it is further reduced that water (liquid) enters the inner side through the first casing and the second casing.

  According to a fourth aspect of the present invention, in the casing structure according to any one of the first to third aspects, the fastening portion is surrounded by a periphery of the fastening hole as the fastening portion in the second casing. Thus, the waterproof lip portion protruding in the fastening direction is formed, and the waterproof lip portion is crushed by the seating surface of the fastening member.

  According to the same configuration, a waterproof lip projecting in a fastening direction so as to surround the fastened portion is formed at the periphery of the fastening hole as the fastened portion in the second casing, The first and second casings are crushed by the seating surface of the fastening member for fastening and fixing. Therefore, the crushing waterproof lip portion prevents water (liquid) from entering the joint fastening portion from the outside. Thereby, it is possible to prevent water (liquid) from entering the inner side through the gap between the first casing and the second casing without performing a separate process, while having a simple shape without requiring another member. Can be reduced.

  According to a fifth aspect of the present invention, the first and second casings in the casing structure according to any one of the first to fourth aspects are fixed to a motor body that drives the rotary shaft, and the rotary shaft is rotated. A gear housing that houses a reduction gear that decelerates and outputs, and a housing cover that closes an opening of the gear housing, and a motor that includes the gear housing, the housing cover, and the motor body.

  According to this configuration, for example, even when water (liquid) enters the position of the fastened portion through the fastening member, the water (liquid) travels between the mating surfaces of the gear housing and the housing cover to reduce the reduction gear. Thus, it is possible to provide a motor in which the intrusion into the inner side in which etc. are accommodated is reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the casing structure and motor which can reduce that a liquid permeates into an inner side can be provided.

1 is a side view of a motor in the present embodiment. The top view of the housing cover in this Embodiment. The exploded sectional view corresponding to the AA line in Drawing 1. Sectional drawing corresponding to the AA line in FIG. The exploded sectional view in another example. Sectional drawing in another example.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, a motor 1 is a wiper motor used as a drive source of a vehicle wiper device that wipes raindrops and the like attached to a windshield of a 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 opening part of the yoke 4, and the worm 8 is formed in the front end side.

  The speed reduction unit 3 is accommodated in the gear housing 11 and meshed with the worm 8, a cup-shaped gear housing 11 as a first casing, a housing cover 12 as a second casing that closes an opening of the gear housing 11. Worm wheel 13 and an output shaft (not shown) provided to rotate integrally with worm wheel 13. In the present embodiment, the worm 8 and the worm wheel 13 constitute a reduction gear.

  The gear housing 11 is made of a conductive metal material (in this embodiment, it is formed by die-casting an aluminum alloy). As shown in FIG. 3, a predetermined portion of the housing side edge portion 11a as an edge portion thereof is A fastening hole 11b serving as a fastened portion is formed in a recessed manner (so as to open in the same direction as the housing recess for housing the worm 8 and the worm wheel 12). A large diameter portion 11c having a larger diameter than the bottom side is formed on the opening side of the fastening hole 11b. The bottom side of the fastening hole 11b is a female screw.

  The housing cover 12 is made of an electrically insulating resin material and has a substantially plate shape as shown in FIG. 2, and a cover side edge portion 12a as an edge portion thereof is aligned with the housing side edge portion 11a. 11 is formed in a shape capable of closing the opening (accommodating recess for accommodating the worm 8 and the worm wheel 12).

  In the cover side edge portion 12a of the housing cover 12, a fastening hole 12b as a fastened portion is formed at a predetermined position corresponding to the fastening hole 11b as shown in FIG.

  Further, as shown in FIG. 3, a waterproof lip portion 12c protruding in the fastening direction (upward in FIG. 3) is formed around the fastening hole 12b in the housing cover 12 so as to surround the fastening hole 12b. ing. Specifically, the housing cover 12 has a diameter larger than that of the fastening hole 12b around the fastening hole 12b on the opposite surface side (upper side in FIG. 3) of the cover side edge part 12a aligned with the housing side edge part 11a. A recess 12d is formed in the recess. And the waterproof lip part 12c which protruded in the fastening direction (upward in FIG. 3) is formed in the bottom part of the recessed part 12d at the periphery of the fastening hole 12b so as to surround the fastening hole 12b. The waterproof lip portion 12c of the present embodiment has a triangular shape whose radial width decreases as the cross-section approaches the tip (upper end in FIG. 3) before assembly (before crushing), which will be described later. Yes.

  The housing cover 12 is provided with a ground terminal 21 as shown in FIGS. One end side of the ground terminal 21 is connected to other electrical components provided on the inner side of the housing cover 12 (inside the cover side edge portion 12 a), and the other end side is electrically connected to the gear housing 11. Is provided. Specifically, the earth terminal 21 of the present embodiment is insert-molded in the housing cover 12 with the middle portion embedded. As shown in FIG. 3, the ground terminal 21 is exposed at the cover side edge 12a (the side facing the housing side edge 11a) while being exposed on the inner side of the housing cover 12 (of the cover side edge 12a). An exposed portion 21a extending from the inner side to the fastening hole 12b side, and an annular joint fastening portion 21b that is exposed together with the exposed portion 21a at the tip of the exposed portion 21a and is disposed around the fastening hole 12b. In addition, as shown in FIG.3 and FIG.4, the cylindrical part 21c which protrudes in a cylindrical shape is formed in the inner peripheral side of the joint fastening connection part 21b of this Embodiment. The exposed portion 21 a is provided in a state where the exposed surface is flush with the surface of the housing cover 12.

  Further, as shown in FIGS. 2 and 3, a seal member 22 (see FIG. 3) interposed between the housing side edge portion 11 a of the gear housing 11 and the housing side edge portion 11 a is disposed on the cover side edge portion 12 a of the housing cover 12. A seal groove 23 is formed. The seal groove 23 of the present embodiment is formed over the entire circumference of the cover side edge portion 12a. Further, as shown in FIG. 2, the seal groove 23 includes a cover molding groove 23a formed on the surface of the cover side edge portion 12a, the joint fastening connection portion 21b, and the inner side of the housing cover 12 (cover side edge portion 12a). And a terminal groove 23b as a transverse groove that crosses the ground terminal 21. As shown in FIGS. 3 and 4, the terminal groove 23 b is formed by bending the exposed portion 21 a of the ground terminal 21, and is formed so as to be connected to the cover forming groove 23 a without a step. Further, the seal groove 23 (the cover forming groove 23a and the terminal groove 23b) of the present embodiment is recessed in an arc shape in cross section.

  As shown in FIG. 3, the seal member 22 is disposed in the seal groove 23 (the cover molding groove 23a and the terminal groove 23b). The sealing member 22 of the present embodiment is a butyl rubber-based sealing material, and a melted material is applied (injected) to the sealing groove 23 using a nozzle and cooled as shown in FIG. It arrange | positions so that a part may rise from the groove | channel 23. FIG.

The housing cover 12 is fixed to the gear housing 11 and closes an opening of the gear housing 11 (accommodating recess for accommodating the worm 8 and the worm wheel 12).
Specifically, the gear housing 11 and the housing cover 12 are threaded into the fastening hole 11b (the female screw) through the fastening hole 12b with the cover side edge 12a aligned with the housing side edge 11a. It is fastened and fixed by a screw 31 (see FIGS. 1, 3 and 4) as a fastening member. In this state, the joint fastening connection portion 21b of the earth terminal 21 is fastened together around the screw 31, as shown in FIG. 4, and is electrically connected to the housing side edge portion 11a. In this state, the cylindrical portion 21 c of the earth terminal 21 is fitted into the large diameter portion 11 c of the gear housing 11.

  In this state, as shown in FIG. 4, the waterproof lip portion 12c is crushed by the seat surface 31a of the screw 31, and the waterproof lip portion 12c extends from the outside to the joint fastening connection portion 21b (gap). It will be partitioned by.

  Further, in this state, the seal member 22 (see FIG. 3) disposed so as to partially swell from the seal groove 23 (the cover molding groove 23a and the terminal groove 23b) has a housing side edge as shown in FIG. It is compressed (crushed) and pinched at 11a.

Next, the characteristic effects of the above embodiment will be described below.
(1) The seal groove 23 formed in the cover side edge portion 12a of the housing cover 12 and disposed between the mating surfaces with the gear housing 11 is provided with the joint fastening connection portion 21b and the housing cover 12. Terminal groove 23b as a transverse groove that passes between the inner side (inside the cover side edge 12a) and crosses the ground terminal 21. Therefore, it is reduced that water (liquid) penetrates into the inner side through the space between the gear housing 11 and the housing cover 12 from the fastening hole 12b of the fastening and fixing portion. That is, the seal groove 23 having the terminal groove 23b formed so as to pass between the joint fastening connection portion 21b and the inner side of the housing cover 12 (inside the cover side edge portion 12a) and across the ground terminal 21 has a seal member. 22 is arranged. Therefore, for example, even if water (liquid) enters through the screw 31 to the position of the joint fastening connection portion 21b, the water (liquid) travels between the gear housing 11 and the housing cover 12 and the worm 8 or worm wheel. Intrusion to the inner side in which 13 etc. are accommodated is prevented.

  Since the seal member 22 is disposed in the seal groove 23 including the terminal groove 23b, for example, the seal member 22 is not provided and the seal member 22 is simply provided on the exposed ground terminal (plane). It is possible to prevent the member from obstructing the electrical connection between the joint fastening connection portion 21 b and the gear housing 11. Specifically, for example, when the seal member is arranged on the ground terminal (plane) without providing the terminal groove 23b, the seal member spreads due to the pressure by the gear housing 11, and is between the joint fastening connection portion 21b and the gear housing 11. However, it may be possible to avoid such a problem because the contact area may be reduced and the contact area may be reduced and the electrical connection may be hindered. Therefore, the electrical connection of the joint fastening connection portion 21b to the gear housing 11 can be ensured.

  (2) The ground terminal 21 has an intermediate portion embedded in the housing cover 12 by insert molding, and the joint fastening connection portion 21b is exposed through an exposed portion 21a provided so as to be exposed at the cover side edge portion 12a. It is formed in an exposed state together with 21a. A transverse groove that passes between the inner side of the housing cover 12 (inside the cover side edge portion 12 a) and the joint fastening connection portion 21 b and crosses the ground terminal 21 is a terminal groove formed in the exposed portion 21 a of the ground terminal 21. Since it is 23b, it is possible to prevent water (liquid) from entering the inside of the conductive metal materials (between the ground terminal 21 and the gear housing 11), in which a slight gap is particularly likely to occur.

  (3) A waterproof lip portion 12c protruding in the fastening direction so as to surround the fastening hole 12b is formed on the periphery of the fastening hole 12b in the housing cover 12, and the waterproof lip portion 12c is formed between the gear housing 11 and the housing cover. 12 is crushed by a seating surface 31a of a screw 31 for fastening and fixing 12. Therefore, the crushed waterproof lip portion 12c (see FIG. 4) prevents water (liquid) from entering the joint fastening portion 21b side from the outside. As a result, water (liquid) can be further reduced from entering the inside through the gear housing 11 and the housing cover 12 without requiring a separate member and having a simple shape and without performing a separate process. can do.

The above embodiment may be modified as follows.
In the above-described embodiment, the ground terminal 21 has the intermediate portion embedded in the housing cover 12 by insert molding, and the joint fastening connection portion 21b is provided via the exposed portion 21a provided to be exposed at the cover side edge portion 12a. It is formed in an exposed state together with the exposed portion 21a, and the transverse groove is assumed to be a terminal groove 23b formed in the exposed portion 21a. However, the inner side (cover side edge portion 12a) It may be changed to a transverse groove of another configuration passing between the inside and the inside.

  For example, you may change as shown in FIG.5 and FIG.6. That is, the ground terminal 41 of this example (see FIGS. 5 and 6) has an intermediate portion embedded in the housing cover 12 by insert molding, and is embedded so as not to be exposed even at the cover side edge portion 12e. Embedded portion 41a extending from the inner side to the fastening hole 12f side, and an annular joint fastening portion 41b arranged in an exposed state around the fastening hole 12f at the tip of the buried portion 41a. A transverse groove that passes between the joint fastening connection portion 41b and the inner side of the housing cover 12 (inside the cover side edge portion 12e) and crosses the ground terminal 41 is formed in the housing cover 12 at a position corresponding to the buried portion 41a. The transverse transverse groove 42 is formed. That is, the seal groove 43 of this example is formed by continuously forming the cover forming groove 23a (see FIG. 2) and the transverse forming groove 42 of the above embodiment on the housing cover 12. In this way, the seal groove 43 including the transverse groove (transverse shaping groove 42) can be easily formed without any breaks or steps (over the entire circumference of the cover side edge portion 12e). Therefore, it is further reduced that water (liquid) enters the inner side through the mating surfaces of the gear housing 11 and the housing cover 12.

  In the above embodiment, the peripheral edge of the fastening hole 12 b in the housing cover 12 is formed with the waterproof lip portion 12 c that protrudes in the fastening direction so as to surround the fastening hole 12 b and is crushed by the seat surface 31 a of the screw 31. However, the present invention is not limited to this, and the housing cover may not be formed with the waterproof lip portion 12c.

  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. In the above-described embodiment, the first and second casings are the gear housing 11 and the housing cover 12. However, the first and second casings are not limited to the casing structure including the first and second casings other than the gear housing 11 and the housing cover 12. May be used.

  DESCRIPTION OF SYMBOLS 2 ... Motor main body, 7 ... Rotating shaft, 8 ... Worm which comprises a part of reduction gear, 11 ... Gear housing (1st casing), 11a ... Housing side edge (edge), 11b ... Fastening hole (fastened) Part), 12 ... Housing cover (second casing), 12a, 12e ... Cover side edge part (edge part), 12b, 12f ... Fastening hole (fastened part), 12c ... Waterproof lip part, 13 ... One of the reduction gears Worm wheel 21, 41 ... ground terminal, 21a ... exposed part, 21b, 41b ... joint tightening part, 22 ... seal member, 23, 43 ... seal groove, 23b ... terminal groove (transverse groove), 31 ... Screw (fastening member), 31a ... Seat surface, 41a ... Buried part, 42 ... Transverse forming groove (transverse groove).

Claims (5)

The first casing made of a conductive metal material and the second casing made of an electrically insulating resin material are combined with each other, and a fastening member is inserted into a fastened portion formed at a predetermined portion of the edge, so that the first And the second casing are fastened and fixed to each other, and a joint fastening portion formed on an earth terminal provided in the second casing is electrically connected to the first casing around the fastening member by the fastening and fixing. A casing structure that is fastened together,
A seal groove for disposing a seal member interposed between the mating surfaces with the first casing is formed at an edge of the second casing, and the seal groove includes the joint fastening connection portion and the second casing. A casing structure including a transverse groove formed so as to pass between the inner side and the earth terminal. The casing structure according to claim 1,
The ground terminal has an intermediate portion embedded in the second casing, and the joint connection portion is formed through an exposed portion provided to be exposed at an edge portion of the second casing,
The casing structure, wherein the transverse groove is a terminal groove formed in the exposed portion. The casing structure according to claim 1,
In the ground terminal, an intermediate portion is embedded in the second casing, and the joint fastening connection portion is exposed through an embedded portion embedded so as not to be exposed at an edge portion of the second casing,
The transverse groove is a transversely formed groove formed in the second casing at a position corresponding to the buried portion. In the casing structure according to any one of claims 1 to 3,
A waterproof lip portion protruding in a fastening direction so as to surround the fastened portion is formed at the periphery of the fastening hole as the fastened portion in the second casing, and the waterproof lip portion is a seating surface of the fastening member. Casing structure characterized by being crushed by   5. The first and second casings in the casing structure according to claim 1, wherein the first and second casings are fixed to a motor body that drives a rotating shaft, and contain a reduction gear that decelerates and outputs the rotation of the rotating shaft. A motor housing comprising a gear housing and a housing cover that closes an opening of the gear housing, the gear housing, the housing cover, and the motor body.

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