JP5009347B2 - DC motor - Google Patents

Description

  The present invention relates to a DC motor including a brush holder.

  Conventionally, a brush holder included in a DC motor is integrally formed so as to have a brush holding portion that holds a brush, a component holding portion that holds an electrical component such as a choke coil connected to the brush, and a connector portion. In some cases, a terminal that is electrically connected to a connection terminal of an electrical component and extends to a connector portion is provided (for example, see Patent Document 1).

  Such a brush holder is, for example, partly accommodated in a yoke housing that substantially accommodates a rotating shaft to which a commutator is fixed, and constitutes a part of the motor body, and the yoke housing decelerates rotation of the rotating shaft. A gear housing (deceleration unit) that houses a reduction mechanism for fixing is fixed so as to sandwich the brush holder, and a DC motor is constituted by them.

JP 2003-79109 A

  By the way, in the brush holder as described above, for example, it may be difficult to form a brush holding portion for directly holding the brush based on the position of the connector portion. Specifically, for example, when it is desired to arrange the connector portion at a position close to the radial direction of the cylindrical brush holding portion substantially along the radial direction, the interference between the slide core and the connector portion for forming the cylindrical shape is considered. They may be difficult to mold. In addition, this becomes a factor which largely separates the distance of a brush holding part and a connector part, and causes the enlargement of a brush holder. Further, in the case of the brush holder as described above, for example, even when a brush holder having a specification that differs only in the position of the connector portion is manufactured, a mold for manufacturing the entire brush holder is required for each specification.

  Therefore, for example, it is conceivable to divide the brush holder into a holding member that holds the brush (having a brush holding portion) and a base member that has a connector portion and is fitted to the holding member. However, in this case, unless the dimensional accuracy of the holding member and the base member is made high, there is a tendency that their assembly becomes difficult or rattling occurs. Although it is conceivable to fix the holding member and the base member with an adhesive or heat caulking, these methods make the manufacturing equipment and the manufacturing process special and increase the manufacturing cost.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to provide a brush holder that can be easily assembled without increasing the dimensional accuracy while being divided. It is providing the direct-current motor provided with.

According to the first aspect of the present invention, a motor main body having a yoke housing that substantially accommodates a rotating shaft to which a commutator is fixed, and a brush holder in which a brush holding portion that holds a brush that is in sliding contact with the commutator is formed. A DC motor including a reduction gear housing that houses a reduction gear mechanism for reducing the rotation of the rotary shaft and is fixed to the yoke housing, wherein the brush holder has the brush holding portion. A holding member that is substantially accommodated in the yoke housing, and a base member that has a connector portion and is assembled to the holding member on the gear housing side, and the holding member has a diameter larger than that of the brush holding portion. the inward bearing holder is provided for holding a bearing for rotatably supporting the rotary shaft, the bearing holder, when passing through the holding member together In the axial direction of the rotating shaft, the holding member is provided in a substantially cylindrical shape on the gear housing side opposite to the brush holding portion, and the rotating shaft is rotatably supported on the inner periphery thereof. A gist is that a bearing is held , and the base member is provided with a central hole through which the bearing holding portion is inserted in a state where the base member and the holding member are assembled.

The gist of the invention described in claim 2 is that the central hole has a larger diameter than the bearing holding portion.
According to a third aspect of the present invention, in the DC motor according to the first or second aspect, the base member includes a base portion formed in a substantially flat circular shape, and the connector portion at a tip extending from the base portion. The gist of the invention is to have a formed base extending portion and a terminal extending from the base portion through the inside of the base extending portion to the connector portion.

  According to a fourth aspect of the present invention, in the DC motor according to any one of the first to third aspects, the reduction mechanism includes a worm shaft that is rotatably supported by a bearing provided in the gear housing. And the worm shaft is drivingly connected to the rotating shaft extending from the motor body.

  According to a fifth aspect of the present invention, in the DC motor according to any one of the first to fourth aspects, the base member is loosely fitted to the holding member.

  According to the present invention, it is possible to provide a direct current motor including a brush holder that can be easily assembled without being highly accurate while being divided.

FIG. 3 is a cross-sectional view of a main part of the DC motor in the present embodiment. The top view of the brush holder in this Embodiment. The top view of the base member and seal member in this Embodiment. The top view of the holding member in this Embodiment. The principal part perspective view of the base member and seal member in this Embodiment. The perspective view of the holding member in this Embodiment. (A) Aa sectional drawing of FIG. (B) bb sectional drawing of FIG. The front view of the circuit breaker in this Embodiment. The fragmentary perspective view for demonstrating the coil terminal support part in this Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a DC motor 1 of this embodiment. The DC motor 1 is a motor used as a drive source for a power window device mounted on a vehicle. The DC motor 1 includes a motor body 2 and a speed reduction unit 3.

The motor body 2 includes a yoke housing 4, a pair of magnets 5, an armature (armature) 6, a commutator 7, a brush holder 8, and a pair of brushes 9.
The yoke housing 4 has a bottomed flat cylindrical shape, and a pair of magnets 5 are fixed to the inner side surfaces of the curved surfaces 4b connecting the pair of flat surfaces 4a. An armature 6 is accommodated inside the magnet 5. The armature 6 has a rotating shaft 10, and the base end portion of the rotating shaft 10 is rotatably supported by a bearing (not shown) held at the center of the bottom of the yoke housing 4. A commutator 7 is fixed to the front end side of the rotary shaft 10 and to the opening side of the yoke housing 4.

  In the opening of the yoke housing 4, a pair of flange portions 4 c are formed extending from the curved surface 4 b outward in the radial direction (in the left-right direction in FIG. 1). A brush holder 8 is fixed to the opening of the yoke housing 4.

  The brush holder 8 is formed in a shape that substantially covers the opening of the yoke housing 4, that is, a substantially flat circular shape (see FIG. 2), and a holder main body 8 a that is partly inserted and accommodated in the yoke housing 4; An extension portion 8b extending from the holder body 8a to the outer side in the radial direction of the yoke housing 4 (left side in FIGS. 1 and 2) and a connector portion 8c formed at the tip of the extension portion 8b are provided.

  Further, as shown in FIG. 2, the holder body 8a includes a pair of brush holding portions 11 for holding the brush 9, coil holding portions 14 and 15 for holding the choke coils 12 and 13, and a circuit breaker. A breaker holding part 17 for holding 16 and a bearing holding part 19 for holding a bearing 18 (see FIG. 1) are provided. In the present embodiment, the choke coil 12 and the circuit breaker 16 constitute electric parts, respectively, and the coil holding part 14 and the breaker holding part 17 constitute a part holding part, respectively. The brush 9 on one side (left side in FIG. 2) is electrically connected to the choke coil 12, and the brush 9 on the other side (right side in FIG. 2) is connected to the circuit breaker 16 via the choke coil 13. Electrically connected. The brush holder 8 has an external connector that is electrically connected to the choke coil 12 and the circuit breaker 16 by the holder body 8a, extends to the connector portion 8c, and is fitted to the connector portion 8c. A pair of terminals 21 and 22 to be connected to the terminals are arranged. As shown in FIG. 1, the front end side of the rotating shaft 10 (the front end side from the commutator 7) is rotatably supported by the bearing 18 held by the bearing holding portion 19.

  The speed reduction unit 3 includes a gear housing 31, a worm shaft 32, a worm wheel 33, and a clutch 34. In the present embodiment, the worm shaft 32 and the worm wheel 33 constitute a reduction mechanism for reducing the rotation of the rotary shaft 10.

  The gear housing 31 is made of synthetic resin and is formed in a predetermined shape so as to accommodate the worm shaft 32, the worm wheel 33 and the clutch 34. The gear housing 31 has an opening 31 a that faces the opening of the yoke housing 4. The gear housing 31 and the yoke housing 4 pass through the flange portion 4c so as to sandwich the brush holder 8 therebetween, and are screwed into the gear housing 31 side (specifically, a nut held by the gear housing 31). It is fixed with a screw 35.

  The worm shaft 32 is rotatably supported by bearings 36 and 37 provided in the gear housing 31, and is drivingly connected to the rotary shaft 10 extending from the motor body 2 via the clutch 34. The clutch 34 operates to lock the rotation of the worm shaft 32 so that the driving force from the rotating shaft 10 is transmitted to the worm shaft 32, and conversely, the driving force from the worm shaft 32 is not transmitted to the rotating shaft 10. That is, the clutch 34 is provided to prevent the rotation of the DC motor 1 from the load side (output shaft 38 side).

  The worm 32 a of the worm shaft 32 is meshed with the worm wheel 33. The worm wheel 33 is drivingly connected to an output shaft 38 disposed so as to be orthogonal to the worm shaft 32. The output shaft 38 is drivingly connected to a known wire regulator (not shown) that opens and closes a window glass (not shown). When the output shaft 38 rotates, the regulator operates to open and close the window glass.

Here, the brush holder 8 and its fixing structure of the present embodiment will be described in detail.
The brush holder 8 includes a synthetic resin holding member 41 (see FIGS. 4 and 6), a synthetic resin base member 51 (see FIGS. 3 and 5), and a seal member 61 made of an elastic material such as an elastomer material. (See FIG. 3 and FIG. 5).

  As shown in FIG. 4, the holding member 41 forms a part of the holder main body 8 a and substantially covers the opening of the yoke housing 4, that is, a direction corresponding to the axial direction of the rotating shaft 10 (hereinafter, When viewed from the simple (referred to as the axial direction) (see FIG. 4), it is formed in a substantially flat circular shape, and is fitted and inserted into the yoke housing 4 so as to be substantially accommodated. Further, the holding member 41 includes the brush holding portion 11, the coil holding portions 14 and 15, the breaker holding portion 17, the bearing holding portion 19, and a pair of positioning columns 42 as positioning means (see FIG. 1). ) And a pair of engaging claws 43 (see FIG. 6, only one is shown in the figure).

  When viewed from the axial direction (see FIG. 4), the brush holding portion 11 is centered in the short direction (vertical direction in FIG. 4) at both ends in the longitudinal direction (left and right direction in FIG. 4) of the holding member 41, respectively. Is formed. The brush holding portion 11 is formed in a substantially quadrangular cylindrical shape penetrating in a direction substantially along the radial direction, and can hold a substantially quadrangular columnar brush 9 (see FIG. 2) inserted from the outside in the radial direction. Is formed.

  The coil holding portions 14 and 15 are viewed from the axial direction in the longitudinal direction (left and right direction in FIG. 4) of the holding member 41 at one end in the short direction (up and down direction in FIG. 4) at both ends (in FIG. 4). , Formed on the brush holding portion 11 (clockwise side with respect to the rotation shaft 10). The coil holding portions 14 and 15 are erected in a substantially cylindrical shape along the axial direction (see FIG. 6), and the substantially cylindrical choke coils 12 and 13 (see FIGS. 2 and 9) inserted from the axial direction. For example). In addition, the coil holding terminals 14 and 15 are partly cut out of the cylindrical shape, so that the coil connection terminals project from the substantially cylindrical shape of the choke coils 12 and 13 to the outside in the radial direction. Lead-out slits 14a and 15a are formed so that 12a and 13a (see FIGS. 2 and 9) can be led out to the outside (center side in the longitudinal direction). The lead slits 14a and 15a are set to have a width slightly larger than the diameter of the coil connection terminals 12a and 13a.

  The breaker holding part 17 is viewed from the axial direction in one side (lower side in FIG. 4) of the longitudinal direction (left and right direction in FIG. 4) of the holding member 41 in the lateral direction (vertical direction in FIG. 4). ). The breaker holding portion 17 includes a support wall 17a, a pair of side walls 17b and 17c, an extended opposing wall 17d, and a central opposing column 17e to support the circuit breaker 16 (see FIGS. 2 and 8). . Specifically, the support wall 17a is seen along the longitudinal direction at one end (lower side in FIG. 4) of the holding member 41 in the short side direction (vertical direction in FIG. 4) when viewed from the axial direction. It extends along the axial direction while extending. Further, the pair of side walls 17b and 17c are extended from the both ends in the longitudinal direction of the support wall 17a to the other side (upper side in FIG. 4) in the lateral direction. The extended opposing wall 17d extends from the side wall 17b on one side (right side in FIG. 4) so as to face the support wall 17a. The central opposing column 17e is erected along the axial direction so as to face the support wall 17a in the center in the longitudinal direction (left and right direction in FIG. 4). Thereby, the breaker holding | maintenance part 17 can hold | maintain the substantially plate-shaped circuit breaker 16 (refer FIG.2 and FIG.8) inserted from an axial direction. As shown in FIG. 2, the circuit breaker 16 has a pair of breaker connection terminals 16a and 16b in the longitudinal direction protruding from the substantially plate shape in the plate thickness direction. Further, the breaker connection terminal 16a on one side (right side in FIG. 2) bends in a direction (right direction in FIG. 2) in which the tip is separated from the breaker connection terminal 16b on the other side (left side in FIG. 2). Is formed. Further, as shown in FIG. 8, the breaker connection terminal 16a on one side (right side in FIG. 2) in the present embodiment has the above axial direction (the left side in FIG. 2) more than the breaker connection terminal 16b. In FIG. 8, it is formed at a position slightly protruding in the vertical direction).

  The bearing holding portion 19 is formed at the center of the holding member 41 when viewed from the axial direction. The bearing holding portion 19 penetrates the holding member 41 and is opposite to the coil holding portions 14 and 15 and the like (on the lower side in FIG. 1 in the axial direction and on the back side in FIG. 4). It is erected in a substantially cylindrical shape, and is formed so as to be able to hold a bearing 18 (see FIG. 1) on its inner peripheral surface.

  The positioning pillars 42 are respectively formed at the center in the short direction (vertical direction in FIG. 4) at both ends of the holding member 41 in the longitudinal direction (horizontal direction in FIG. 4) when viewed from the axial direction. The positioning column 42 is erected on the opposite side (the lower side in FIG. 1 in the axial direction and the rear side in FIG. 4) from the coil holding portions 14 and 15 and the like. Further, as shown in FIG. 1, a fitting recess 42a is formed in the tip of the positioning column 42 so as to be recessed in the axial direction, and positioning means formed in the gear housing 31 is formed in the fitting recess 42a. A pair of positioning projections 31b are formed so that they can be fitted together. That is, the holding member 41 is positioned in a direction orthogonal to the axial direction with respect to the gear housing 31 by fitting the positioning convex portion 31b of the gear housing 31 to the fitting concave portion 42a of the positioning column 42. .

  The engaging claws 43 are part of the longitudinal direction (left and right direction in FIG. 4) of the holding member 41 in the short direction (up and down direction in FIG. 4) at both ends when viewed from the axial direction (in FIG. It is formed on the brush holding part 11 (counterclockwise side with the rotation shaft 10 as the center). The engaging claw 43 is erected on the opposite side to the coil holding portions 14 and 15 (on the back side in FIG. 4 in the axial direction) and claw portion 43a (see FIG. 7).

  The holding member 41 has a position corresponding to the lead-out slit 14a of the coil holding portion 14 on one side (the left side in FIG. 4 and the side corresponding to the connector portion 8c). A first through window 44 penetrating in the axial direction is formed at a position where the coil connection terminal 12a (see FIG. 2 and FIG. 9) derived from is disposed.

  Further, the holding member 41 has a position corresponding to the lead-out slit 15a of the coil holding portion 15 on the other side (right side in FIG. 4), and the coil connection terminal 13a (see FIG. 5) led out from the lead-out slit 15a. 2) and a second through window 45 penetrating in the axial direction is formed at a position where the breaker connection terminal 16a on one side is disposed.

  Further, the holding member 41 is provided with a breaker connection terminal 16b on the other side which is a position corresponding to a position between the central opposing column 17e and the side wall 17c on the other side (left side in FIG. 4). A third through window 46 is formed so as to penetrate in the axial direction at the position where it is placed.

  The base member 51 constitutes a part of the holder main body 8a and is formed in a substantially flat circular shape slightly larger than the holding member 41 when viewed from the axial direction (see FIG. 3), and the extension A base extension part 53 that constitutes a part of the part 8 b and extends further from the longitudinal direction of the base part 52, and the connector part 8 c formed at the tip of the base extension part 53 are provided. The base member 51 has terminal terminal portions 21a and 22a that are exposed in both the axial directions at positions that can be electrically connected to the coil connection terminal 12a and the breaker connection terminal 16b. The terminals 21 and 22 extending through the inside to the connector portion 8c are embedded by insert molding. The terminal terminals 21a and 22a of the terminals 21 and 22 are arranged along the coil connection terminal 12a and the breaker connection terminal 16b, that is, along the direction orthogonal to the axial direction, and the coil connection terminal 12a and It is welded to the breaker connection terminal 16b, and in this embodiment, it is spot welded with a pair of jigs in the axial direction.

  In the base portion 52, when viewed from the axial direction, a position corresponding to the outer edge of the holding member 41 and a step (a step toward the gear housing 31, see FIG. 7B). And a flange portion 52a extending in a flange shape from the position corresponding to the outer edge of the holding member 41 to the outside.

  The seal member 61 is provided so as to cover the flange portion 52 a on the outside from a position corresponding to the outer edge of the holding member 41. Further, the seal member 61 is provided so as to cover the base end side of the base extending portion 53. The seal member 61 is provided integrally with the base member 51 using the base member 51 as an insert. The seal member 61 is sandwiched between the yoke housing 4 and the gear housing 31 in a state where the brush holder 8 is assembled so as to be sandwiched between the yoke housing 4 and the gear housing 31. And the gear housing 31 are sealed.

  The sealing member 61 is formed (integrated) with a sandwiched portion 61a as an elastic member. The sandwiched portion 61a of the present embodiment is a position corresponding to the outer edge of the holding member 41 (overlapping in the axial direction), and when viewed from the axial direction (see FIG. 3), the flange portion 52a is positioned at the four corners. It is formed to cover. Further, the sandwiched portion 61a of the present embodiment is formed so that the thickness in the axial direction is thinner than other portions.

  In addition, an engagement hole 52b (see FIGS. 3 and 7A) is formed in the base portion 52 at a position corresponding to the engagement claw 43 so that it can be assembled with the holding member 41. Then, the engaging claw 43 is inserted into the engaging hole 52b from the axial direction, and the claw portion 43a of the engaging claw 43 is engaged with the surface 52c (the lower surface in FIG. 7A) around the engaging hole 52b. As a result, the base portion 52 (base member 51) is assembled to the holding member 41. The length of the engaging claw 43 in the present embodiment is such that the holding member 41 and the base member 51 are in other parts when the claw portion 43a is engaged with the surface 52c (see FIG. 7A). So that they do not overlap directly in the axial direction, that is, so that they are loosely fitted, and so that the sandwiched portion 61a is compressed between them (see FIG. 7B). Is set. In the present embodiment, the inner edge 61b of the seal member 61 as the elastic engagement portion (the sandwiched portion) in a state where the base member 51 and the holding member 41 are assembled (see FIGS. 2 and 7A). 61a) abuts the outer edge of the holding member 41 in the direction orthogonal to the axial direction (compression direction of the sandwiched portion 61a) (see FIG. 7B).

  The base portion 52 is formed with a pair of insertion holes 52d having a larger diameter than the positioning columns 42 through which the positioning columns 42 are inserted in a state where the base member 51 and the holding member 41 are assembled. .

  The base portion 52 is formed with a central hole 52e having a diameter larger than that of the bearing holding portion 19 through which the bearing holding portion 19 is inserted in a state where the base member 51 and the holding member 41 are assembled.

  Further, in the base portion 52, a welding hole 52f continues from the central hole 52e at a position corresponding to a position where the coil connection terminal 13a and the breaker connection terminal 16a overlap in the axial direction (see FIG. 2). Is formed.

  In addition, in the base portion 52, the breaker connection terminal 16a in a state where the base member 51 and the holding member 41 are assembled at a position corresponding to the breaker connection terminal 16a except for the welding hole 52f. An accommodation recess 52g is formed for accommodating the. The axial position of the coil connection terminal 13a and the breaker connection terminal 16a is changed to another welding position (the terminal terminal portion 21a and the coil connection terminal 12a) by the accommodating recess 52g and the step of the breaker connection terminal 16a with respect to the breaker connection terminal 16b. And the position in the axial direction of the terminal terminal portion 22a and the breaker connection terminal 16b). As a result, the welding positions are the same in the axial direction, and positioning of the jig in the axial direction when spot welding is performed with a pair of jigs in the axial direction is made constant and easy.

  Further, in the state where the base member 51 and the holding member 41 are assembled to the base portion 52, a connection portion X1 (see FIGS. 2 and 9) between the coil connection terminal 12a and the terminal 21 (terminal terminal portion 21a). A coil terminal support portion 52h is formed as a terminal support portion for supporting the coil connection terminal 12a between the coil holding portion 14 and the coil holding portion 14. 2 and 9 illustrate a state before the coil connection terminal 12a and the terminal 21 (terminal terminal portion 21a) are welded (a state in which the coil connection terminal 12a and the terminal 21a are overlapped in the axial direction before being melted with each other). ing. A pair of the coil terminal support portions 52h are erected in the axial direction so as to penetrate the first through window 44, and the distance between them is set to be approximately the same as the diameter of the coil connection terminal 12a. It is possible to support the coil connection terminal 12a inserted in the (incapable of movement) in the interval direction.

  Further, in the state where the base member 51 and the holding member 41 are assembled to the base portion 52, auxiliary support for supporting the tip of the coil connection terminal 12a at a position sandwiching the connection portion X1 together with the coil terminal support portion 52h. A portion 52i is formed. The auxiliary support portion 52i is erected in the axial direction so as to penetrate the first through window 44, and the interval between them is set to be approximately the same as the diameter of the coil connection terminal 12a. The inserted coil connection terminal 12a can be supported in the interval direction (incapable of movement). Here, the first through window 44 has a size that allows the coil terminal support portion 52h and the auxiliary support portion 52i to pass therethrough as described above, and is sufficiently larger than the coil connection terminal 12a when viewed from the axial direction. Moreover, it is formed in a size including a terminal terminal portion 21a larger (substantially circular) than the other portion of the terminal 21. Further, the first through window 44 has a space for preventing the heat at the time of welding from being transmitted to the holding member 41 (allowing sufficient release of heat) by being sized as described above. This facilitates connection work.

  Further, in the state where the base member 51 and the holding member 41 are assembled to the base portion 52, the connection portion X2 (see FIG. 2) between the breaker connection terminal 16b and the terminal 22 (terminal terminal portion 22a), and the coil A breaker terminal support portion 52j is formed as a terminal support portion for supporting the breaker connection terminal 16b with the holding portion 14. FIG. 2 illustrates a state before the breaker connection terminal 16b and the terminal 22 (terminal terminal portion 22a) are welded (a state in which the breaker connection terminal 16b and the terminal 22 are just overlapped in the axial direction before melting each other). A pair of the breaker terminal support portions 52j are erected in the axial direction so as to penetrate the third through window 46, and the distance between them is set to be substantially the same as the width of the breaker connection terminal 16b. It is possible to support the breaker connection terminal 16b inserted in (in an immovable manner) in the interval direction. Here, as described above, the third through window 46 has a size that allows the breaker terminal support 52j to pass therethrough and is sufficiently larger than the breaker connection terminal 16b when viewed from the axial direction. It is formed in a size that includes a terminal terminal portion 22a that is larger (substantially circular) than this portion. Further, the third through window 46 has a size as described above, and is also a space for preventing the heat at the time of welding from being transmitted to the holding member 41 (allowing sufficient release of heat). This facilitates connection work.

  Further, in the state where the base member 51 and the holding member 41 are assembled to the base portion 52, the connection portion X3 (see FIG. 2) between the coil connection terminal 13a and the breaker connection terminal 16b, the coil holding portion 15 and the like. A coil terminal support portion 52k for supporting the coil connection terminal 13a is formed between them. FIG. 2 shows a state before the coil connection terminal 13a and the breaker connection terminal 16b are welded (a state in which the coil connection terminal 13a and the breaker connection terminal 16b are overlapped in the axial direction before being melted with each other). A pair of the coil terminal support portions 52k are erected in the axial direction so as to penetrate the second through window 45, and the distance between them is set to be approximately the same as the diameter of the coil connection terminal 13a. It is possible to support the coil connection terminal 13a inserted in the gap in the interval direction (incapable of movement).

  Further, in the state where the base member 51 and the holding member 41 are assembled to the base portion 52, the connection portion X3 (see FIG. 2) between the coil connection terminal 13a and the breaker connection terminal 16b, and the coil terminal support portion 52k. A breaker terminal support 52l for supporting the tip of the breaker connection terminal 16a is formed between the breaker connection terminal 16a and the breaker connection terminal 16a. A pair of the breaker terminal support portions 52l are erected in the axial direction so as to penetrate the second through window 45, and the interval between them is set to be substantially the same as the width of the tip of the breaker connection terminal 16a. It is possible to support the breaker connection terminal 16a inserted between them in the direction of the interval (incapable of movement). Here, as described above, the second through window 45 has such a size that the coil terminal support portion 52k and the breaker terminal support portion 52l can pass through, and the coil connection terminal 13a and the breaker connection are viewed from the axial direction. It is formed sufficiently larger than the terminal 16b. In addition, the second through window 45 has a size as described above, and is also a space for preventing the heat at the time of welding from being transmitted to the holding member 41 (allowing sufficient release of heat). This facilitates connection work.

The above-described components are assembled to form the DC motor 1 including the brush holder 8.
Next, characteristic effects of the above embodiment will be described below.

  (1) Since the brush holder 8 includes a holding member 41 having the brush holding portion 11 and a base member 51 having the connector portion 8c and loosely fitted to the holding member 41, they are integrally molded. Compared to the above, for example, it is possible to avoid that it is difficult to form the brush holding portion 11 based on the position of the connector portion 8c. Therefore, for example, the distance between the brush holding portion 11 and the connector portion 8c can be set close, and the brush holder 8 and thus the DC motor 1 can be downsized. Further, for example, when manufacturing a brush holder having different specifications only in the position of the connector portion 8c, the holding member 41 can be a common component.

  Further, since the elastic sandwiched portion 61a is interposed between the holding member 41 and the base member 51 that are loosely fitted, the dimensional accuracy of the holding member 41 and the base member 51 is increased. Therefore, rattling between the holding member 41 and the base member 51 can be prevented while allowing easy assembly. That is, in the case where the clamped portion 61a is not provided, there is a tendency that the assembly of the holding member 41 and the base member 51 is difficult or the rattling is likely to occur unless the dimensional accuracy is high. You can avoid them.

  (2) Since the sandwiched portion 61a is integrally formed with the seal member 61 for sealing each of the base member 51, the yoke housing 4 and the gear housing 31, the process of manufacturing and arranging it is facilitated. . That is, in the case of manufacturing a brush holder having a specification originally having a seal member, an elastic member having a function similar to that of the sandwiched portion 61a is obtained by molding the seal member 61 and integrally molding the sandwiched portion 61a. The process of manufacturing and assembling is not required.

  (3) Since the seal member 61 including the sandwiched portion 61a is integrated with the base member 51 using the base member 51 as an insert product, the base member 51 is, for example, compared with a case where the seal member 61 is manufactured separately and assembled to the base member 51. Fixing to the member 51 becomes strong.

  (4) Since the seal member 61 has an inner edge 61b that abuts the holding member 41 in a direction orthogonal to the compression direction (axial direction) of the sandwiched portion 61a, the compression direction (axial direction) between the holding member 41 and the base member 51 ) In the orthogonal direction can be further prevented.

  (5) Since the holding member 41 and the gear housing 31 are provided with positioning columns 42 (fitting concave portions 42a) and positioning convex portions 31b that engage with each other in a direction orthogonal to the axial direction of the rotary shaft 10, the base member The position of the holding member 41 can be made constant (with high accuracy) with respect to the gear housing 31 regardless of the dimensional error 51 (without dimensional errors being stacked). Therefore, for example, the position of the brush 9 held by the brush holding portion 11 of the holding member 41 can be made constant (with high accuracy) with respect to the gear housing 31 and eventually the yoke housing 4 fixed to the gear housing 31. it can. In addition, since the holding member 41 includes the bearing holding portion 19 that holds the bearing 18 for rotatably supporting the rotary shaft 10, the position of the bearing 18 is constant (with high accuracy) with respect to the gear housing 31. can do. Therefore, it is possible to prevent positional deviation between the brush 9 and the commutator 7 fixed to the rotating shaft 10.

  (6) Since the positioning pillar 42 (fitting recess 42a) and the positioning protrusion 31b are provided in a pair at a position sandwiching the rotation shaft 10, the holding member 41 is centered on the gear housing 31 and the rotation shaft 10 is centered with a simple configuration. Can be positioned with high accuracy.

  (7) Since the positioning column 42 is provided at a position farthest from the rotary shaft 10 in the holding member 41 (both ends in the longitudinal direction of the holding member 41) when viewed from the axial direction, compared to the case where it is provided at other positions. The holding member 41 and the gear housing 31 can be positioned with the highest accuracy.

  (8) The base member 51 includes a connection portion X1 (see FIGS. 2 and 9) between the coil connection terminal 12a of the choke coil 12 and the terminal 21 (terminal terminal portion 21a), and a coil holding portion that holds the choke coil 12. 14 is provided with a coil terminal support 52h for supporting the coil connection terminal 12a. Therefore, for example, even when an external force is applied to the base member 51 when an external connector is fitted to the connector portion 8c and the relative position with respect to the holding member 41 is slightly shifted, the coil connection terminal 12a is held between the connection portion X1 and the coil holding portion. By being supported by the coil terminal support portion 52h of the base member 51 between the portion 14 and the weld portion 14, it is possible to prevent stress from being applied to the (welded) connection portion X1.

  Further, the base member 51 is connected between a breaker connection terminal 16b of the circuit breaker 16 and a connection portion X2 (see FIG. 2) between the terminal 22 (terminal terminal portion 22a) and a breaker holding portion 17 for holding the circuit breaker 16. A breaker terminal support 52j for supporting the breaker connection terminal 16b is provided. Therefore, for example, even when an external force is applied to the base member 51 when an external connector is fitted to the connector portion 8c, the breaker connection terminal 16b is held between the connection portion X2 and the breaker even if the relative position with respect to the holding member 41 is slightly shifted. By being supported by the breaker terminal support portion 52j of the base member 51 with the portion 17, it is possible to prevent stress from being applied to the (welded) connection portion X2. Therefore, damage to the welded connection portions X1 and X2 is prevented, and as a result, the choke coil 12 (coil connection terminal 12a) and the circuit breaker 16 (breaker connection terminal 16b) and the terminals 21 and 22 (terminal terminal portions 21a and 22a). ) Is prevented.

  (9) The terminal terminals 21a and 22a of the terminals 21 and 22 are arranged along the coil connection terminal 12a and the breaker connection terminal 16b, and are welded (spot welded) to the coil connection terminal 12a and the breaker connection terminal 16b. Is. Therefore, for example, compared to a case where a connection hole is formed and a coil connection terminal or a breaker connection terminal is inserted into the connection hole and welded (soldered), the (welded) connection portions X1 and X2 are damaged (mutually Although it is easy to peel off, since it is prevented that stress is applied to the connection parts X1 and X2, this is suitably prevented. Of course, spot welding as in the present embodiment eliminates the need for a separate member such as solder as compared to soldering or the like.

  (10) The base member 51 is provided with an auxiliary support part 52i for supporting the tip of the coil connection terminal 12a at a position sandwiching the connection part X1 together with the coil terminal support part 52h. Therefore, the coil connection terminal 12a is supported by the coil terminal support part 52h and the auxiliary support part 52i before the step of welding the coil connection terminal 12a to the terminal 21 (terminal terminal part 21a), thereby connecting the coil connection terminal 12a. It is possible to prevent the position shift of the portion that becomes the portion X1. Therefore, the welding process can be performed easily and reliably.

  (11) Since the holding member 41 is provided with the first to third through windows 44 to 46 penetrating corresponding to the positions where the coil connection terminals 12a and 13a and the breaker connection terminal 16b are arranged, connection work (welding ) Becomes easy. Further, for example, the entire brush holder 8 does not become larger as compared with a configuration in which the coil connection terminal and the breaker connection terminal and the terminal are connected outside the brush holder without passing through the through window.

  (12) Since the coil terminal support portions 52h and 52k, the auxiliary support portion 52i, and the breaker terminal support portions 52j and 52l are erected so as to penetrate the first to third through windows 44 to 46, The work of supporting the coil connection terminals 12a and 13a and the breaker connection terminals 16a and 16b is facilitated.

The above embodiment may be modified as follows.
-In above-mentioned embodiment, although the to-be-clamped part 61a was integrally molded with the seal member 61, it is not limited to this, Even if it is manufactured and assembled as an elastic member separate from the seal member 61 Good. Further, the position and the number of the sandwiched portions 61a (elastic members) may be changed as appropriate.

  In the above embodiment, the seal member 61 is integrated with the base member 51 by using the base member 51 as an insert product. However, the seal member 61 is not limited to this, and is manufactured separately and attached to the base member 51. It may be assembled.

  In the above embodiment, the seal member 61 has the inner edge 61b (elastic engagement portion) that contacts the holding member 41 in a direction orthogonal to the compression direction (axial direction) of the sandwiched portion 61a. It is good also as what does not contact | abut the holding member 41 in the orthogonal direction of a compression direction (axial direction). In addition, the sealing member 61 may be provided with an elastic engaging portion that functions (abuts) in the same manner as the inner edge 61b at a portion other than the inner edge 61b.

  In the above embodiment, the holding member 41 and the gear housing 31 are each provided with the positioning column 42 (fitting recess 42a) and the positioning protrusion 31b. However, the present invention is not limited to this, and means different from these You may change to the structure which positions by. In addition, the shape, number, position, and the like of the positioning column 42 (fitting recess 42a) and the positioning protrusion 31b may be changed as appropriate.

  In the above embodiment, the base member 51 is provided with the coil terminal support 52h and the breaker terminal support 52j. However, the present invention is not limited to this, and the coil terminal support 52h and the breaker terminal support 52j are omitted. May be.

  In the above embodiment, the terminal terminals 21a and 22a of the terminals 21 and 22 are arranged and welded (spot welded) along the coil connection terminal 12a and the breaker connection terminal 16b. A connection hole may be formed, and a coil connection terminal or a breaker connection terminal may be inserted into the connection hole and welded (soldered). Moreover, although the terminal terminal portions 21a and 22a, the coil connection terminal 12a, and the breaker connection terminal 16b of the terminals 21 and 22 are configured along the direction orthogonal to the axial direction, they may be changed to a configuration along the axial direction. . In this case, for example, the coil terminal support 52h and the breaker terminal support 52j may be changed to a pair that extends along the direction orthogonal to the axial direction.

In the above embodiment, the base member 51 is provided with the auxiliary support portion 52i. However, the present invention is not limited to this, and the auxiliary support portion 52i may be omitted.
In the embodiment described above, the choke coil 12 and the coil connection terminal 12a and the breaker connection terminal 16b of the circuit breaker 16 are supported by the terminal support (coil terminal support 52h and breaker terminal support 52j) as connection terminals. The connection terminals of electrical components other than the choke coil 12 and the circuit breaker 16 may be supported by the terminal support portion.

In the above embodiment, the terminals 21 and 22 are configured to be insert-molded in the base member 51, but may be configured to be assembled to the base member 51.
In the above-described embodiment, the DC motor 1 is used as a drive source for the power window device. However, the DC motor 1 may be used as a drive source for other devices.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(B) The brush holder according to claim 3, wherein the seal member has an elastic engagement portion that comes into contact with the holding member in a direction orthogonal to the compression direction of the elastic member.

  According to this configuration, since the seal member has the elastic engagement portion that comes into contact with the holding member in the direction orthogonal to the compression direction of the elastic member, the backlash of the holding member and the base member in the direction orthogonal to the compression direction is prevented. Further, it can be prevented.

  (B) A DC motor comprising a motor body having the brush holder according to any one of claims 2 and 3 and (a) and the yoke housing, and a speed reducing unit having the gear housing. The holding member is substantially accommodated in the yoke housing, and the base member is loosely fitted to the holding member on the gear housing side, and the holding member and the A direct current motor, wherein the gear housing is provided with positioning means that engage with each other in a direction orthogonal to the axial direction of the rotating shaft.

  According to this configuration, the holding member and the gear housing are each provided with positioning means that engage with each other in the direction orthogonal to the axial direction of the rotating shaft, so that the position of the holding member can be adjusted regardless of the dimensional error of the base member. It can be constant with respect to the gear housing. Therefore, for example, the position of the brush held by the brush holding portion of the holding member can be made constant with respect to the gear housing and the yoke housing.

  DESCRIPTION OF SYMBOLS 4 ... Yoke housing, 7 ... Commutator, 8c ... Connector part, 9 ... Brush, 10 ... Rotating shaft, 11 ... Brush holding part, 31 ... Gear housing, 32 ... Worm shaft which comprises a part of reduction mechanism, 33 ... Worm wheel constituting part of the speed reduction mechanism, 41... Holding member, 51... Base member, 61... Seal member, 61a .. sandwiched portion 61a (elastic member).

Claims (5)

A motor body having a yoke housing that substantially accommodates a rotating shaft to which a commutator is fixed, and a brush holder in which a brush holding portion that holds a brush that is in sliding contact with the commutator is formed;
A direct-current motor including a reduction mechanism that houses a reduction mechanism for reducing the rotation of the rotation shaft and has a gear housing fixed to the yoke housing;
The brush holder is
A holding member having the brush holding portion and substantially accommodated in the yoke housing;
A base member that has a connector portion and is assembled to the holding member on the gear housing side;
The holding member is provided with a bearing holding portion for holding a bearing for rotatably supporting the rotating shaft on a radially inner side of the brush holding portion , and the bearing holding portion penetrates the holding member. In addition, in the axial direction of the rotation shaft, the holding member is erected in a substantially cylindrical shape on the gear housing side opposite to the brush holding portion, and the rotation shaft is rotatably supported on the inner periphery thereof. Of the bearing is held,
A DC motor, wherein the base member is provided with a central hole through which the bearing holding portion is inserted in a state where the base member and the holding member are assembled. The direct current motor according to claim 1,
The DC motor according to claim 1, wherein the central hole has a larger diameter than the bearing holding portion. The DC motor according to claim 1 or 2,
The base member includes a base portion formed in a substantially flat circular shape, a base extending portion in which the connector portion is formed at a tip extending from the base portion, and an interior of the base extending portion from the base portion. A DC motor having a terminal extending to the connector portion. The DC motor according to any one of claims 1 to 3,
The reduction mechanism includes a worm shaft rotatably supported by a bearing provided in the gear housing, and the worm shaft is drivingly connected to the rotation shaft extending from the motor body. motor. The DC motor according to any one of claims 1 to 4,
The direct current motor, wherein the base member is loosely fitted to the holding member.

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