JP2006094693A - Motor and motor for wiper apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor for shortening and simplifying a wiring structure, and easily and surely ensuring a waterproof property of wiring. <P>SOLUTION: The motor 1 is provided with a yoke housing 4, a gear housing 41 for accommodating a worm shaft 42 and a worm wheel 43, and a brush holder 7 having a holder body 7b disposed between the yoke housing 4 and the gear housing 41 and holding brushes 10a, 10b. A fixed contact (contact members 31-33) slidably provided on a movable conductive plate provided on the end face of the worm wheel 43 contacts and does not contact the movable conductive plate in response to the rotation of the worm wheel 43. A communication hole 51d is formed at the end on the yoke housing side of the gear housing 41, and makes the interior of the gear housing 41 communicate with the yoke housing. The fixed contact is provided in the brush holder 7, and extends into the gear housing 41 through the communication hole 51d. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor provided with a mechanism for switching or acquiring an electric signal between a movable conductive plate provided on a wheel gear and a fixed contact provided so as to be slidable on the movable conductive plate.

Conventionally, as a motor, a motor body having an armature and a gear portion having a reduction mechanism are provided, and a movable conductive plate having a predetermined conductive pattern shape is provided on an end surface of a wheel gear in the reduction mechanism, and the gear housing of the gear portion is provided. There is one provided with a fixed contact (for example, see Patent Document 1). In such a motor, the fixed contact is brought into contact / non-contact with the movable conductive plate according to the rotation of the wheel gear, so that switching according to the rotation of the wheel gear is performed. can do. That is, such a motor has a so-called automatic fixed position stop mechanism, and when the wiper switch is turned off to stop the wiper (wiper arm and blade), the wiper is not stopped immediately (unconditionally), but the wiper is The window can be moved to a predetermined stop position and stopped.
Japanese Utility Model Publication No. 6-44371

  By the way, in the motor of the above (Patent Document 1), the connection terminal of the fixed contact and the connection terminal connected to the brush for supplying power to the armature are both arranged outside the gear housing, and these connection terminals are outside the gear housing. It is connected by a connector unit (wiring) fixed to Therefore, the wiring structure is complicated such that the connector unit increases the number of parts and increases the number of assembly steps. Further, since the connector unit (wiring) is provided outside the gear housing, the wiring connecting the fixed contact and the brush becomes long, and the reliability of the wiring against waterproofing is low.

  The present invention has been made in order to solve the above-described problems, and its object is to make the wiring structure short and simple and to easily and reliably ensure the waterproofness of the wiring and to improve the reliability. An object of the present invention is to provide a motor and a motor for a wiper device that can be used.

  According to the first aspect of the present invention, the yoke housing that houses the armature, the gear housing that houses the reduction mechanism for decelerating and transmitting the rotation of the armature, and the yoke housing and the gear housing are arranged between the yoke housing and the gear housing. And a brush holder having a holder main body for holding a brush for supplying power to the armature, wherein the speed reduction mechanism includes a wheel gear, and an end surface of the wheel gear has a predetermined conductive pattern shape. A fixed contact provided in a slidable contact with the movable conductive plate is a motor that contacts / non-contacts with the movable conductive plate according to the rotation of the wheel gear, and the yoke housing of the gear housing The side end portion communicates with the inside of the gear housing and the yoke housing side. There is formed, the fixed contact is provided in the brush holder so as to extend into the gear housing via the communication hole from the brush holder.

  According to a second aspect of the present invention, in the motor according to the first aspect, the brush holder integrally has a connector portion that is exposed to the outside of the yoke housing and the gear housing and can be connected to an external control device. is doing.

  According to a third aspect of the present invention, in the motor according to the second aspect, the speed reduction mechanism comprises a worm speed reduction between a worm shaft rotating concentrically with a rotation axis of the armature and the wheel gear meshed with the worm shaft. The connector portion is disposed on a side where the wheel gear is disposed with respect to the worm shaft.

  According to a fourth aspect of the present invention, in the motor according to any one of the first to third aspects, the yoke housing is opposed to the armature in a direction perpendicular to the rotation axis of the armature, and the magnet is fixed to the inner surface. A pair of arcuate portions and a planar portion parallel to each other connecting the arcuate portions, and the rotation axis of the wheel gear is set parallel to the orthogonal line of the plane of the planar portion The fixed contacts are juxtaposed on a plane parallel to the plane of the planar portion.

According to a fifth aspect of the present invention, in the motor according to the fourth aspect, the fixed contact includes a plurality of contact members, and the contact members extend in parallel with each other and are arranged in parallel.
According to a sixth aspect of the present invention, in the motor according to the fourth or fifth aspect, the connector portion is disposed on the side of the arc-shaped portion outside the yoke housing and is opposed to the planar portion. The outer shape of the connector portion is set so as to be within the range of the distance between the connectors.

  According to a seventh aspect of the present invention, in the motor according to any one of the first to sixth aspects, the fixed contact is formed in the butted region where the yoke housing and the gear housing are butted against each other. Supported by a brush holder.

  According to an eighth aspect of the present invention, the motor according to any one of the first to seventh aspects is supported by the rotation of the armature that is pivotally supported by the gear housing and decelerated by the speed reduction mechanism. A gist of a motor for a wiper device in which a wiper for wiping the wiping surface is connected to an output shaft.

(Function)
According to the first aspect of the present invention, since the fixed contact that is in sliding contact with the movable conductive plate is provided in the brush holder, the electrical components are concentrated in the brush holder, and the fixed contact is connected to the brush. Even when the fixed contact is connected to the external control device together with the brush, the wiring structure can be simplified. Moreover, since the fixed contact is provided so as to extend from the brush holder into the gear housing through a communication hole formed at the yoke housing side end portion of the gear housing, wiring for connecting the fixed contact and the brush is provided. While being able to shorten, the waterproofness of the wiring can be ensured easily and reliably.

  According to the second aspect of the present invention, the brush holder integrally has a connector portion that is exposed to the outside of the yoke housing and the gear housing and can be connected to the external control device. As a result, the wiring structure of the brush, the fixed contact, and the connector can be simplified.

  According to the third aspect of the present invention, since the connector portion is disposed on the side where the wheel gear is disposed with respect to the worm shaft, the fixed contact provided in a slidable contact with the movable conductive plate of the wheel gear is provided with the worm. The distance between the connector portion and the fixed contact can be shortened while the configuration is provided on the wheel gear side so as not to intersect the shaft. Therefore, for example, the fixed contact can be easily disposed, and the wiring connecting the fixed contact and the connector portion can be shortened. Further, for example, the fixed contact can be provided between the holder main body portion and the connector portion, and the brush holder can be reduced in size.

  According to the invention of claim 4, the yoke housing is thin in the opposing direction of the planar portion (the direction perpendicular to the plane), and the rotation axis of the wheel gear is set parallel to the plane orthogonal to the plane portion. By doing so, the gear housing that houses the wheel gear can also be made thin in the thin direction of the yoke housing. In addition, since the fixed contacts are arranged side by side on a plane parallel to the plane of the planar portion, an increase in the thickness in the thin direction can be suppressed. In addition, since a relatively wide arrangement space can be secured in the direction parallel to the plane of the planar portion, it is possible to easily secure the mutual insulation of the fixed contacts.

  According to the fifth aspect of the present invention, the fixed contact includes a plurality of contact members, and the contact members extend in parallel with each other and are arranged in parallel. The communication hole can be easily penetrated while reducing the size of the communication hole. Therefore, it becomes possible to easily assemble the brush holder and the gear housing while facilitating the design of the gear housing (communication hole).

  According to the invention described in claim 6, the connector portion is disposed on a side of the arc-shaped portion, and an outline of the planar portion in an opposing direction (a direction perpendicular to the plane) is the planar portion. Since it is set so as to be within the facing range, the connector portion does not hinder the reduction in thickness of the motor.

  According to the seventh aspect of the present invention, since the fixed contact is supported by the brush holder in the abutting region where the yoke housing and the gear housing are opposed to each other, a decrease in the positional accuracy of the fixed contact is suppressed. In addition, the waterproof property of the fixed contact can be easily ensured. Specifically, since the brush holder is sandwiched in the abutting region where the yoke housing and the gear housing face each other, the deformation thereof is reduced. And since the fixed contact is supported by the brush holder in the abutting area, the positional accuracy is lowered compared to the case where it is supported outside the abutting area (which is not pinched and easily deformed freely by heat or the like). Will be suppressed. Further, in the butted region where the yoke housing and the gear housing are butted against each other, the brush holder is difficult to be exposed to the outside, and is generally a portion to which a waterproof structure is originally applied. Since the fixed contact is supported by the brush holder in the abutting area, the waterproof property can be easily secured as compared with a case where the stationary contact is supported outside the abutting area (for example, a waterproof structure is required separately). Can do.

  According to invention of Claim 8, in the motor for wiper apparatuses, the effect of the invention of any one of Claims 1 thru | or 7 can be acquired.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to make wiring structure short and simple, the waterproofness of wiring can be ensured easily and reliably and the motor for wiper apparatus which can make reliability high can be provided.

  Hereinafter, an embodiment in which the present invention is embodied in a motor 1 for a wiper device (specifically, a rear wiper device) in a vehicle will be described with reference to FIGS. As shown in FIG. 1, the motor 1 includes a motor main body 2 and a gear portion 3.

  As shown in FIG. 2, the motor body 2 includes a yoke housing (hereinafter simply referred to as a yoke) 4 formed in a substantially bottomed cylindrical shape, a pair of magnets 5 fixed to the inner surface of the yoke 4, and the yoke 4. And an armature (armature) 6 that is housed therein and rotatably supported. The yoke 4 according to the present embodiment has a pair of arcuate portions 4a (see FIGS. 1 and 2) that face each other in the direction orthogonal to the axis of the armature 6 (the direction orthogonal to the rotational axis), and the magnets 5 are fixed to the inner surface. ) And parallel planar portions 4b (see FIG. 1) that connect the arc-shaped portions 4a to each other. That is, the yoke 4 is a so-called flat type, and is thin in the direction facing the planar portion 4b (in the direction perpendicular to the plane). In addition, a flange portion 4 c that extends radially outward is formed in the opening of the yoke 4.

  A brush holder 7 is provided in the opening of the yoke 4. As shown in FIGS. 2 to 5, the brush holder 7 includes a resin brush holder resin body 7 a molded from a resin material having electrical insulation, and the brush holder resin body 7 a includes a holder main body portion 7 b and The flange portion 7c (see FIG. 4), the extending portion 7d, the connector portion 7e, and the contact base portion 7f are integrally formed. The holder main body portion 7 b is formed so as to be substantially accommodated in the opening of the yoke 4. A bearing 8 (see FIG. 2) is held in the center hole of the holder body 7b, and the tip end side of the rotary shaft 9 of the armature 6 is rotatably supported by the bearing 8. Further, brushes 10a and 10b for supplying power to the armature 6 are held on the inner side of the yoke 4 in the holder main body 7b, and the brushes 10a and 10b are pressed and contacted with a commutator 11 fixed to the rotary shaft 9. ing. The flange portion 7c extends in a flange shape from the holder main body portion 7b. Further, the extending part 7d is directed from a part of the flange part 7c toward the outside of one arcuate part 4a of the yoke 4 (from one arcuate part 4a of the yoke 4 outward in the radial direction of the rotary shaft 9). E) It is extended.

  The connector part 7e is provided at the tip of the extension part 7d. The connector portion 7e of the present embodiment is formed so that an external connector (not shown) can be fitted from the axial direction of the armature 6 (rotational axis direction, upward in FIG. 2). That is, the connector portion 7e is formed in a substantially bottomed rectangular tube shape (cross-sectional U shape) in which the axial direction (upward direction in FIG. 2) of the armature 6 is opened. In addition, the connector portion 7e of the present embodiment is disposed on the side of the arc-shaped portion 4a of the yoke 4, and the outline G of the connector portion 7e is a planar portion as schematically shown in FIG. It is set so as to be within the range T of the distance between the opposing portions of the planar portion 4b in the opposing direction of 4b (the direction perpendicular to the plane).

  The contact base portion 7f extends between the holder main body portion 7b and the connector portion 7e, and extends in the opening direction of the yoke 4 (downward in FIGS. 2 and 4) from a position corresponding to the extending portion 7d. Is formed. As shown in FIG. 5, the contact base portion 7 f is formed in a thin thin plate shape in the direction perpendicular to the plane of the planar portion 4 b (see FIG. 1), and from the axis center X of the armature 6. Also, it is disposed on the one planar portion 4b side (the side closer to one of the pair of planar portions 4b and the lower side in FIG. 5).

  Further, in the brush holder 7, the brush holder resin body 7a has a plurality of (five in the present embodiment) terminals 21 to 25 formed of conductive metal plates, as shown in FIG. It is insert-molded so that it is embedded with a part exposed.

  The terminal 21 for the first power source (for the high potential power source) has one end exposed to the outside from the connector portion 7e, and the other end extending to the holder body portion 7b side and mounted on the holder body portion 7b. 3) and a brush coil 10a through a choke coil 27 (see FIG. 3) mounted on the holder body 7b.

  The second power source (low potential power source) terminal 22 has one end exposed to the outside from the connector portion 7e and the other end extending to the holder main body portion 7b side and mounted on the holder main body portion 7b. Is connected to the first terminal. The terminal 22 is formed with a contact terminal 22a (so as to branch) between one end and the other end thereof. The contact terminal 22a extends to the distal end side of the contact base portion 7f, and an upright portion 22b (see FIG. 6) is formed at the distal end. The contact terminal 22a extends along the axial direction of the armature 6. The contact terminal 22a is set so that the thickness direction thereof coincides with the direction perpendicular to the plane of the planar portion 4b (see FIG. 1) (the flat plate direction is parallel to the planar portion 4b). Has been. Further, the upright portion 22b is bent so that it protrudes to the outside of the contact base portion 7f (on the side close to the other of the pair of planar portions 4b and on the upper side in FIGS. 5 and 6). Is formed. Further, FIG. 6 shows an upright portion 22b to which an after-mentioned caulking is applied.

  One end of the first fixed contact terminal 23 is exposed to the outside from the connector portion 7e, and the other end is parallel to the contact terminal 22a and is a contact terminal 23a disposed in the same manner. . Further, an upright portion 23b (see FIG. 4) similar to the upright portion 22b is formed at the tip (front end) of the contact terminal 23a.

  One end of the second fixed contact terminal 24 is exposed to the outside from the connector portion 7e, and the other end is a contact terminal 24a disposed in parallel with the contact terminal 22a. . Further, an upright portion 24b (see FIG. 4) similar to the upright portion 22b is formed at the tip (front end) of the contact terminal 24a. In addition, each front-end | tip (each standing part 22b-24b) of each contact terminal 22a-24a in this Embodiment is set so that it may incline with respect to the axis orthogonal direction of the armature 6, as shown in FIG. Has been.

  The intermediate connection terminal 25 is disposed on the holder body 7b, one end of which is connected to the second terminal of the capacitor 26 (see FIG. 3), the other end is connected to the second terminal of the breaker 28, and The intermediate portion is connected to the brush 10b via a choke coil 29 (see FIG. 3) mounted on the holder main body portion 7b.

  The brush holder 7 is provided with contact members 31 to 33 that are electrically connected and fixed to the tips of the contact terminals 22a to 24a, that is, to the standing portions 22b to 24b, respectively. In detail, each contact member 31-33 of this Embodiment is formed in the same shape (the product number is one). The contact members 31 to 33 are formed of a conductive metal plate having spring properties (elasticity), and base end portions 31b to 33b in which through holes 31a to 33a (see FIGS. 4 and 6) are formed, and a base It consists of inclined portions 31c to 33c that are inclined and bent from the end portions 31b to 33b, and contact portions 31d to 33d formed at the tips of the inclined portions 31c to 33c. Each of the contact members 31 to 33 has the upright portions 22b to 24b penetrated through the through holes 31a to 33a, respectively, and the upright portions 22b to 24b are cracked (see FIG. 6). It is fixed with respect to ~ 24b. In the contact base portion 7f, the upright portions 22b to 24b correspond to the upright portions 22b to 24b, and the upright portions 22b to 24b and the contact members 31 to 33 are opposite to the upright portions 22b to 24b. 7g (see FIG. 6) is formed (in this embodiment, for inserting a jig for receiving the bottom when performing the caulking). The contact members 31 to 33 are juxtaposed so as to extend in parallel to each other. Further, in the present embodiment, the contact terminals 22a to 24a and the contact members 31 to 33 constitute a fixed contact, and they are arranged in parallel on a plane parallel to the plane of the planar portion 4b. .

  Further, a seal material 34 is provided on the brush holder 7 (brush holder resin body 7a). Specifically, the sealing material 34 is made of an elastomer. As shown in FIGS. 3 to 5, the sealing material 34 is provided so as to substantially cover the flange portion 7 c and the extending portion 7 d.

  As shown in FIGS. 1 and 2, the gear unit 3 includes a gear housing 41, a worm shaft 42, a worm wheel 43 as a wheel gear, a sector gear 44 as a sub gear member, a spacing plate 45, an output shaft. 46. In the present embodiment, the worm shaft 42 and the worm wheel 43 constitute a reduction mechanism and a worm reduction mechanism for reducing and transmitting the rotation of the armature 6.

  The gear housing 41 is a housing body in which a housing recess 51a is formed that is open in a direction perpendicular to the axis of the armature 6 (on the side close to the other of the pair of planar portions 4b and in the front direction in FIG. 2). 51 and a cover 52 (only a part is shown in FIG. 2) fixed so as to cover the receiving recess 51a.

  The housing body 51 is a die-cast product of an aluminum alloy that is a conductive material. In the housing body 51, the yoke 4 side end portion which is a part of the outer wall of the housing recess 51a is a fixed portion 51b having a shape corresponding to the opening portion (flange portion 4c) of the yoke 4. The housing main body 51 has the fixing portion 51b and the flange portion 4c of the yoke 4 so that the fixing portion 51b and the flange portion 4c of the yoke 4 sandwich the flange portion 7c of the brush holder 7 (via the sealing material 34). Are screwed together. That is, the brush holder 7 is assembled in the abutting state in the coupling and fixing of the yoke 4 and the gear housing 41. Further, a central hole 51c (see FIG. 7) is formed in the fixed portion 51b of the housing body 51 at a position corresponding to the rotation shaft 9 to communicate the inside of the housing recess 51a with the yoke 4 side. In addition, a communication hole 51d (see FIG. 7) is formed in the fixing portion 51b of the housing body 51 at a position corresponding to the contact base portion 7f. The communication hole 51d communicates the inside of the housing recess 51a with the yoke 4 side. That is, in the state where the yoke 4, the brush holder 7, and the housing body 51 (gear housing 41) are assembled, the tip end portion of the rotary shaft 9 extends from the central hole 51c into the housing recess 51a (inside the gear housing 41). The contact base portion 7f (fixed contact) extends from the communication hole 51d into the housing recess 51a (in the gear housing 41).

  Here, the accommodation recess 51a is a side close to the other of the pair of planar portions 4b, and opens in the front direction of the paper in FIG. 2, and thus is closer to one of the pair of planar portions 4b. In FIG. 2, the contact base portion 7f (fixed contact) disposed on the back side of the drawing is disposed on the bottom side of the housing recess 51a (rather than the worm wheel 43). Also, a contact surface S (see FIG. 6) that contacts the contact base portion 7f is formed at a position corresponding to the contact base portion 7f at the bottom of the housing recess 51a of the housing body 51. The contact surface S of the present embodiment is formed on the tip side from the processing hole 7g in the contact base portion 7f. Therefore, the contact base portion 7 f comes into contact with the contact surface S of the housing body 51 from the processing hole 7 g. A recess (with respect to the contact surface S) is formed at a position corresponding to the processing hole 7g of the housing body 51, and a gap K is formed in the recess.

  Further, the fixed contacts (contact terminals 22a to 24a and contact members 31 to 33) are within a butting region H (see FIG. 2) where the yoke 4 and the gear housing 41 (housing body 51) are butted against each other. It will be supported by the brush holder 7 (contact base part 7f). The butting region H in the present embodiment is the same as the region surrounded by the outer edge of the flange portion 4c of the yoke 4 when viewed from the axial direction of the armature 6, and in FIG. A region (range) only in the direction along the line is denoted by a symbol (H).

The housing recess 51a includes a worm housing portion 51e, a wheel housing portion 51f, an output shaft housing portion 51g, and the like that are communicated with each other inside.
The worm accommodating portion 51e is formed to extend on an extension line of the rotary shaft 9, and supports the worm shaft 42 in a rotatable manner therein. The worm shaft 42 is connected to the rotary shaft 9 by a joint 53 so as to be rotatable together.

  The wheel accommodating portion 51f is formed on the side where the connector portion 7e is disposed with respect to the worm accommodating portion 51e, and supports the worm wheel 43 rotatably therein. A part of the worm wheel 43 is engaged with the worm shaft 42. Further, the rotation axis of the worm wheel 43 is set parallel to the orthogonal line of the plane of the planar portion 4b. Further, as shown in FIG. 8, a movable conductive plate 54 having a predetermined conductive pattern shape is provided on one end surface of the worm wheel 43 (the surface on the bottom side of the housing recess 51a). The movable conductive plate 54 (specifically, one end surface of the worm wheel 43 including the movable conductive plate 54) has contact portions 31d to 33d of the contact members 31 to 33 (due to the spring properties of the contact members 31 to 33). It can be slidably contacted by pressing. The contact portions 31d to 33d of the contact members 31 to 33 are in contact / non-contact with the movable conductive plate 54 according to the rotation (rotation angle) of the worm wheel 43 by the predetermined conductive pattern shape which is a known pattern shape. Will be.

  The output shaft accommodating portion 51g is formed on the side where the connector portion 7e is not disposed with respect to the worm accommodating portion 51e (the opposite side of the wheel accommodating portion 51f), and an output shaft supporting portion 51h extending in a cylindrical shape outside at the center. (See FIG. 1) is formed. The output shaft 46 is rotatably supported by the output shaft support portion 51h so that a base end portion thereof is disposed inside the output shaft housing portion 51g and a distal end portion thereof protrudes to the outside. A wiper (rear wiper) W (schematically illustrated in FIG. 1) for wiping the wiping surface is fixed to the distal end portion of the output shaft 46.

  The worm wheel 43 and the output shaft 46 are drivingly connected by a sector gear 44 and a spacing plate 45. Specifically, the sector gear 44 is made of a metal plate, and a base end portion of the sector gear 44 is rotatably connected to a position displaced from the center of the worm wheel 43, and a gear portion 44 a formed at the tip end portion is a base end of the output shaft 46. Is engaged with a gear portion 46a formed in the portion. The sector gear 44 is disposed on the opening side (the front side in FIG. 2) of the housing recess 51a with respect to the worm wheel 43. The interval holding plate 45 is made of a metal plate, and one end portion thereof is rotatably connected to the gear center of the gear portion 44a of the sector gear 44, and the other end portion thereof is rotatably connected to the base end portion of the output shaft 46. The That is, the interval holding plate 45 holds the axial interval (distance) between the gear center of the gear portion 44 a and the output shaft 46. Note that the spacing plate 45 is disposed on the opening side of the housing recess 51a from the sector gear 44 (the front side in FIG. 2). Therefore, when the worm wheel 43 rotates, the output shaft 46 (wiper W) is reciprocally rotated by the action of the sector gear 44 (and the interval holding plate 45), and the wiping surface is reciprocated by the wiper W.

Next, an electrical configuration when the motor 1 is assembled to a vehicle and a vehicle-side external connector is fitted to the connector portion 7e will be described with reference to FIG.
The terminals 21, 23, and 24 exposed at the connector portion 7e are respectively connected to a changeover switch 61 provided at the vehicle driver's seat, and the terminal 22 is connected to the ground. The terminal 24 exposed at the connector 7e is connected to a power source E (vehicle battery). In the present embodiment, the changeover switch 61, the ground, and the power supply E constitute an external control device.

  The changeover switch 61 has a stop position P1 for stopping the motor 1 and an operation position P2 for operating the motor 1. The changeover switch 61 connects the terminal 21 and the terminal 23 at the stop position P1. The changeover switch 61 connects the terminal 21 and the power source E (vehicle battery) at the operating position P2.

  In the motor 1 wired in this way, when the changeover switch 61 is switched to the operating position P2, the brush 10a is connected to the power source E, so that the motor 1 operates. That is, the output shaft 46 (wiper W) is reciprocally rotated, and the wiping operation is performed by the wiper W.

  When the changeover switch 61 is switched from the operating position P2 to the stop position P1, the (direct) connection between the brush 10a and the power source E is cut off, and the brush 10a and the terminal 23 (contact member 32) are connected. .

  At this time, if the movable conductive plate 54 that rotates integrally with the worm wheel 43 is at a predetermined angular position (position where the contact member 31 and the contact member 32 are connected), the terminal 23 connected to the brush 10a is connected to the contact member 31, Since it is connected to the ground via 32 (see FIG. 9), the motor 1 stops.

  At this time, if the movable conductive plate 54 that rotates integrally with the worm wheel 43 is not located at the predetermined angular position but is located at a position where the contact member 32 and the contact member 33 are connected, the terminal 23 connected to the brush 10a is It is connected to a power source E through contact members 32 and 33. Therefore, the operation of the motor 1 is continued. When the movable conductive plate 54 that rotates integrally with the worm wheel 43 rotates to the predetermined angular position, the terminal 23 connected to the brush 10a is connected to the ground via the contact members 31 and 32 (see FIG. 9). Therefore, the motor 1 stops. That is, when the changeover switch 61 is switched to the stop position P1, the movable conductive plate 54 is detected based on the rotational position information detected when the contact members 31 to 33 (contact portions 31d to 33d) are in contact / non-contact with the movable conductive plate 54. The (worm wheel 43) is automatically stopped at the predetermined angular position.

  When the movable conductive plate 54 (worm wheel 43) is at the predetermined angular position (when it is in the state shown in FIG. 9), the wiper W is at a predetermined stop position along, for example, the lower end of the rear window. Is set to Therefore, when the changeover switch 61 is switched from the operation position P2 to the stop position P1, the wiper W automatically stops at a predetermined stop position along the lower end of the rear window.

Next, characteristic effects of the above embodiment will be described below.
(1) Since the fixed contacts (contact terminals 22 a to 24 a and contact members 31 to 33) are provided in the brush holder 7, electrical components are gathered together with the brushes 10 a and 10 b and the like in the brush holder 7. Therefore, for example, even when the contact terminal 22a and the contact member 31 are connected to the brush 10b, the wiring structure can be limited to only the terminals 22 and 25 provided in the brush holder 7, which is simplified. Can do. Further, for example, even when the contact terminals 22a to 24a and the contact members 31 to 33 are connected to the external control device (the changeover switch 61, the ground, and the power source E) together with the brushes 10a and 10b, the wiring structure thereof is reduced. Only the terminals 21 to 25 provided on the brush holder 7 can be provided, and the operation can be simplified.

  In addition, the fixed contacts (contact terminals 22a to 24a and contact members 31 to 33) are connected to the gear housing through a communication hole 51d formed at the yoke 4 side end of the gear housing 41 (housing main body 51) from the brush holder 7. 41 (receiving recess 51a) is provided so as to extend. Therefore, the wiring for connecting the contact terminal 22a and the contact member 31 and the brush 10b (terminals 22 and 25) can be shortened compared with the case where the wiring is provided outside the gear housing (conventional), and the wiring is waterproof. Can be secured easily and reliably.

  (2) Since the brush holder 7 has a connector portion 7e that is exposed to the outside of the yoke 4 and the gear housing 41 and can be connected to an external connector, that is, an external control device (the changeover switch 61, the ground, and the power source E). The electric parts are collected in the brush holder 7. Therefore, compared with the case where the connector part is provided separately from the brush holder, the wiring structure (of each terminal) of the brushes 10a and 10b, the fixed contact, and the connector part 7e is only the terminals 21 to 25 provided on the brush holder 7. Can be easy. In particular, by forming the brush holder 7 by insert molding to embed the terminals 21 to 25 (by molding the terminals 21 to 25 with the brush holder resin body 7a), the electrical insulation of each of the terminals 21 to 25 is achieved. Can be ensured more reliably.

  (3) The connector portion 7e is disposed on the side where the worm wheel 43 is disposed with respect to the worm shaft 42. Therefore, the fixed contacts (contact terminals 22a to 24a and contact members 31 to 33) provided so as to be slidable in contact with the movable conductive plate 54 of the worm wheel 43 are provided on the worm wheel 43 side so as not to intersect the worm shaft 42. However, the distance between the connector portion 7e and the fixed contact can be shortened. Therefore, for example, the fixed contact can be easily disposed so as not to intersect the worm shaft 42, and the wiring (terminals 22 to 24) connecting the fixed contact and the connector portion 7e can be shortened. Further, for example, the fixed contact can be provided between the holder main body portion 7b and the connector portion 7e, and the brush holder 7 can be reduced in size.

  (4) The yoke 4 is thin in the facing direction of the planar portion 4b (the direction perpendicular to the plane), and the rotational axis of the worm wheel 43 is set parallel to the plane orthogonal to the planar portion 4b. The gear housing 41 that houses the worm wheel 43 can also be made thin in the thin direction of the yoke 4. Moreover, since the fixed contacts (contact terminals 22a to 24a and contact members 31 to 33) are arranged in parallel on the plane parallel to the plane of the planar portion 4b, the increase in the thickness in the thin direction is suppressed. Can do. In addition, since a relatively wide arrangement space can be secured in the direction parallel to the plane of the planar portion 4b, it is possible to easily secure the mutual insulation of the fixed contacts.

  (5) The fixed contacts are arranged in parallel so as to extend substantially in parallel (the contact terminals 22a to 24a are parallel and the contact members 31 to 33 are also parallel). And can be easily penetrated while reducing the size of the communication hole 51d. Therefore, it is possible to easily assemble the brush holder 7 and the gear housing 41 (housing main body 51) while facilitating the design of the gear housing 41 (housing main body 51).

  (6) The connector part 7e is arranged on the side of the arcuate part 4a of the yoke 4, and, as schematically shown in FIG. Since it is set so as to be within the distance T between the opposing portions of the planar portion 4b in the direction of the orthogonal line), the connector portion 7e does not hinder the motor 1 from being thinned.

  (7) The fixed contacts (contact terminals 22a to 24a and contact members 31 to 33) are disposed in a butting region H (see FIG. 2) where the yoke 4 and the gear housing 41 (housing body 51) are butted against each other. It is supported by the brush holder 7 (contact base part 7f). Therefore, it is possible to suppress a decrease in the positional accuracy of the fixed contact, and it is possible to easily ensure the waterproof property of the fixed contact. Specifically, since the brush holder 7 is sandwiched between the yoke 4 and the gear housing 41 in the abutting region H, deformation thereof is reduced. Since the fixed contact is supported by the brush holder 7 (contact base portion 7f) in the abutting region H, compared to a case where the fixed contact is supported outside the abutting region H (which is not sandwiched and easily deformed by heat or the like). Thus, the deterioration of the position accuracy is suppressed. As a result, a reduction in detection accuracy of rotational position information by the contact portions 31d to 33d of the contact members 31 to 33, that is, erroneous detection is suppressed. Further, in the abutting region H, the holder main body portion 7b of the brush holder 7 is arranged in a space closed from the outside. Therefore, the waterproof structure arranged in the space closed from the outside is applied to the holder main body portion 7b in which the electric parts for supplying power to the armature 6 are arranged. Since the fixed contact is supported by the brush holder 7 (contact base portion 7f) in the abutting region H, the waterproofing is more waterproof than in the case where it is supported outside the abutting region H (for example, a waterproof structure is required separately). Can be easily secured.

The above embodiment may be modified as follows.
In the above embodiment, the contact terminals 22a to 24a and the contact members 31 to 33 constitute fixed contacts, but from the communication hole 51d (via the communication hole 51d) into the gear housing 41 (accommodating recess 51a). If it is provided in the brush holder 7 so as to extend, the fixed contact may be configured in another configuration. For example, the portions corresponding to the contact members 31 to 33 may be integrally formed continuously from the contact terminals 22a to 24a in the terminals 22 to 24, and these may be fixed contacts. In this way, the number of parts is reduced. Further, for example, only the portions corresponding to the contact terminals 22a to 24a and the contact members 31 to 33 are formed as integral fixed contacts, and the fixed contacts are outside the gear housing 41 (accommodating recess 51a) and contact terminals 22a to 24a. You may change into the structure connected to the terminals 22-24 which are not formed.

In the above embodiment, the brush holder 7 has the connector portion 7e. However, the present invention is not limited to this, and the connector portion may be provided separately from the brush holder (holder body portion).
In the above-described embodiment, the connector portion 7e is configured to be preferably disposed on the side where the worm wheel 43 is disposed with respect to the worm shaft 42, but is not limited thereto, and the connector portion 7e, the worm wheel 43, May be arranged with the worm shaft 42 in between (on the opposite side).

  In the above embodiment, the yoke 4 preferable as the rear wiper motor of the rear wiper device disposed in the vehicle door is a so-called flat type, but the invention is not limited to this. Good.

  In the above embodiment, the fixed contacts are arranged in parallel so as to extend substantially parallel (contact terminals 22a to 24a are parallel and contact members 31 to 33 are also parallel). It is not limited, You may provide so that it may extend in a different direction. Moreover, although each contact member 31-33 was made into the same shape (one product number), it is not limited to this, For example, you may change into a different shape, such as a thing with different length.

  In the above embodiment, the connector portion 7e is disposed on the side of the arc-shaped portion 4a in the yoke 4. However, the present invention is not limited to this. In the opposite direction of the planar portion 4b). Further, the connector portion 7e is set so that the outline G in the opposing direction of the planar portion 4b is set within the distance T between the opposing portions of the planar portion 4b. Even when it is arranged on the side of the arcuate portion 4a, it may be set so as to protrude from the range T of the facing distance.

  In the above embodiment, the sealing material 34 is disposed on the outer peripheral surface of the abutting region H. However, the holder body 7b is waterproof because a waterproof structure disposed in a space closed from the outside is applied. The sealing material 34 may be omitted depending on the arrangement environment of the motor 1.

  In the above embodiment, the motor 1 for the rear wiper device is embodied. However, the present invention is not limited to this, and the motor 1 for the front wiper device may be changed. In this case, for example, the sector gear 44 and the spacing plate 45 are not provided, the output shaft is a motor that rotates integrally with the worm wheel 43, and the output shaft is connected to the front wiper via a link mechanism provided in the vehicle. It may be a thing. Moreover, you may change into the motor for apparatuses (for example, a power window apparatus and a sunroof apparatus) other than a wiper apparatus.

The perspective view of the motor in this Embodiment. FIG. 3 is a cross-sectional view of a main part of the motor in the present embodiment. The top view of the brush holder in this Embodiment. The side view of the brush holder in this Embodiment. The bottom view of the brush holder in this Embodiment. The principal part sectional drawing for demonstrating the connection part of the terminal for a contact and contact member in this Embodiment. The schematic diagram of the motor in this Embodiment. Explanatory drawing for demonstrating the movable conductive plate in this Embodiment. FIG. 3 is a circuit diagram illustrating an electrical configuration in this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 4 ... Yoke housing, 4a ... Arc-shaped part, 4b ... Planar part, 5 ... Magnet, 6 ... Armature, 7 ... Brush holder, 7b ... Holder main-body part, 7e ... Connector part, 10a, 10b ... Brush, 22a-24a Contact terminals constituting a part of the fixed contact, 31-33 ... Contact member constituting a part of the fixed contact, 41 ... Gear housing, 42 ... Worm shaft constituting a part of the speed reduction mechanism and the worm speed reduction mechanism, 43 ... Worm wheel (wheel gear) constituting part of the speed reduction mechanism and worm speed reduction mechanism, 46 ... output shaft, 51d ... communication hole, 54 ... movable conductive plate, 61 ... changeover switch constituting part of the external control device , E: a power source that constitutes a part of the external control device; G: an outline of the connector portion; H: a butting region; T: a range of the distance between the opposing surfaces;

Claims (8)

A yoke housing that houses the armature;
A gear housing that houses a speed reduction mechanism for decelerating and transmitting the rotation of the armature;
A brush holder provided between the yoke housing and the gear housing and having a holder main body for holding a brush for supplying power to the armature;
The speed reduction mechanism includes a wheel gear, and a movable conductive plate having a predetermined conductive pattern shape is provided on an end surface of the wheel gear, and a fixed contact provided so as to be slidable with the movable conductive plate is used to rotate the wheel gear. A motor that is contacted / non-contacted with the movable conductive plate in response,
A communication hole that communicates the inside of the gear housing and the yoke housing side is formed at the yoke housing side end of the gear housing,
The motor according to claim 1, wherein the fixed contact is provided on the brush holder so as to extend from the brush holder through the communication hole into the gear housing. The motor according to claim 1,
The brush holder integrally has a connector portion that is exposed to the outside of the yoke housing and the gear housing and can be connected to an external control device. The motor according to claim 2,
The speed reduction mechanism has a worm speed reduction mechanism including a worm shaft that rotates concentrically with a rotation axis of the armature and the wheel gear meshed with the worm shaft,
The motor is characterized in that the connector portion is disposed on a side where the wheel gear is disposed with respect to the worm shaft. The motor according to any one of claims 1 to 3,
The yoke housing has a pair of arcuate portions facing each other in a direction perpendicular to the rotation axis of the armature and each having a magnet fixed to the inner surface thereof, and parallel plane portions connecting the arcuate portions. And
The rotation axis of the wheel gear is set in parallel with the plane orthogonal line of the planar portion,
The motor according to claim 1, wherein the fixed contacts are arranged in parallel on a plane parallel to a plane of the planar portion. The motor according to claim 4,
The fixed contact includes a plurality of contact members, and the contact members extend in parallel with each other and are arranged in parallel. The motor according to claim 4 or 5,
The connector portion is disposed on the side of the arc-shaped portion outside the yoke housing, and the outer shape of the connector portion is set so as to be within the range of the distance between the planar portions facing each other. A motor characterized by that. The motor according to any one of claims 1 to 6,
The motor is characterized in that the fixed contact is supported by the brush holder in a butting region where the yoke housing and the gear housing are butted against each other. The motor according to any one of claims 1 to 7,
For a wiper apparatus, characterized in that a wiper for wiping a wiping surface is connected to an output shaft that is pivotally supported by the gear housing and is transmitted by rotation of the armature decelerated by the speed reduction mechanism. motor.

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