JP2017225240A - Brush holder and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush holder having a structure capable of suppressing protrusion of a seal member formed by integral molding from a desired portion.SOLUTION: A stepped portion 44 is provided on the radially inner surface 41b of an extending portion 41 of a brush holder 14 and molds X1 and X2 are butted against end surfaces 45b and 46b of first and second step portions 45, 46 so that a seal member 35 is integrally molded. In other words, an elastomer resin for forming the seal member 35 comes into contact with the stepped portion 44 (the first and second stepped portions 45, 46) and is regulated, so that it hardly leaks out of the molds X1, X2.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a brush holder and a method for manufacturing the brush holder.

  Conventionally, a brush holder that holds a brush for supplying power to a motor armature is sandwiched between a yoke housing in which an armature is arranged and a gear housing that houses a speed reduction mechanism that decelerates the rotation of the armature. (For example, refer to Patent Document 1).

  The brush holder is disposed in the opening of the yoke housing that is opened in the axial direction, and is used for power supply that is positioned outside the yoke housing and the gear housing, and is electrically connected to the outside. It has a connector part and a connection part which connects a holder main-body part and a connector part. A seal member that seals foreign matter from entering between the holder main body and the yoke housing and between the holder main body and the gear housing is provided in the circumferential direction on the flange portion on the outer periphery of the holder main body.

JP 2006-311751 A

  As one of the methods for fixing the seal member to the brush holder, for example, a resin such as an elastomer is integrally molded later on a target portion (connecting portion, flange portion) of a resin molded body constituting the brush holder. There is color molding. In this case, a pair of molds are arranged so that the target part of the brush holder is sandwiched from above and below in the axial direction of the motor, and a resin such as an elastomer is poured into the molds.

  At that time, since the radial clearance is set so that the resin molded body of the brush holder and the mold do not interfere with each other, the resin for forming the radial end of the seal member leaks from the clearance. There is a fear. If the resin leaks, the seal member protrudes into an unintended range and is molded.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a brush holder having a structure capable of suppressing protrusion of a seal member formed by integral molding from a desired portion, and manufacture of the brush holder. It is to provide a method.

  A brush holder that solves the above problems is used in a motor in which a motor unit and a speed reduction unit are integrally assembled, and is disposed between openings of a yoke housing of the motor unit and a gear housing of the speed reduction unit. A holder main body for holding a brush for supplying power to the motor unit, a connector unit located outside the yoke housing and the gear housing and for electrical connection to the outside, and the holder main unit And a connecting portion for connecting the connector portion, and a seal for tightly sealing each of the opening portions of the yoke housing and the gear housing at a peripheral portion of the holder main body portion and a part of the connecting portion. A brush holder in which members are integrally provided, and has an extending portion that extends from the outer shape of the connecting portion at an intermediate portion of the connecting portion. The seal member is provided on an inner portion of the connecting portion that is closer to the holder main body portion than the extension portion and on a peripheral portion of the holder main body portion, and the extension portion is disposed at an inner position of the extension portion. A projecting portion having a shorter height is provided, and an end portion of the seal member is provided in contact with an inner surface of the projecting portion.

  According to this configuration, when the seal member is integrally formed on the inner portion of the connecting portion and the peripheral portion of the holder main body portion, the metal is formed against the short convex portion provided at the inner position of the extending portion. The seal member can be formed by abutting the mold. Thereby, the resin for the seal member abuts on the convex portion and is restricted and is difficult to leak from the mold, and the seal member can be prevented from being formed beyond the desired range.

In the brush holder, it is preferable that the seal member is flush with a tip surface of the convex portion.
According to this configuration, since the seal member is flush with the tip surface of the convex portion, the mold can be made simple.

The said brush holder WHEREIN: It is preferable that the said convex part is a step provided between the inner surface of the said extension part, and the said connection part.
According to this configuration, since the convex portion is a step portion provided between the inner surface of the extension portion and the connecting portion, the rigidity of the convex portion (step portion) is high. Thereby, a metal mold | die can be abutted with sufficient force with respect to a convex part, and the leakage of resin can be suppressed more reliably.

  In the brush holder, in a state where the holder main body portion is mounted between the opening portions of the yoke housing and the gear housing, the extension portion is in contact with at least one side of the yoke housing and the gear housing. It is preferable to have an abutting part in contact.

  According to this configuration, in the state where the holder main body is mounted between the openings of the yoke housing and the gear housing, the extending portion has a contact portion that contacts at least one side of the yoke housing and the gear housing. Therefore, the extension portion receives a load when the external connector is connected to the connector portion, and the displacement of the connector portion during the connection can be suppressed.

  In the brush holder, the connector portion is provided so as to extend toward the yoke housing side, and the extension amount of the extension portion from the coupling portion is closer to the gear housing side than the yoke housing side. Is preferably set large.

  According to this configuration, the extension amount of the extending portion from the connecting portion is set to be larger on the gear housing side than on the yoke housing side. The load at the time of connecting the connector can be effectively received by the extending portion, and the displacement of the connector portion can be effectively suppressed.

  A manufacturing method of a brush holder that solves the above problem is a manufacturing method of a brush holder in which the seal member is provided by integral molding in the brush holder, and the holder main body portion, the connector portion, the connecting portion, and the extension The main part of the brush holder including the part and the convex part is prepared as a main molded body, and a mold for molding the seal member is placed against the convex part at a desired part of the main molded body Then, the resin for the sealing member is poured into the mold, and the sealing member is integrally molded so that the end of the sealing member is brought into contact with the convex portion to be regulated.

  According to this method, when the seal member is integrally formed on the inner portion of the connecting portion and the peripheral portion of the holder main body portion, the metal is formed against the short convex portion provided at the inner position of the extending portion. The seal member is integrally formed by abutting the mold. Thereby, the resin for the seal member abuts on the convex portion and is restricted and is difficult to leak from the mold, and the seal member can be prevented from being formed beyond the desired range.

  According to the brush holder and the method for manufacturing the brush holder of the present invention, it is possible to prevent the seal member formed by integral molding from protruding from a desired portion.

The front view of the motor with a reduction gear of embodiment. The partial expanded sectional view of the motor of the form. The perspective view of the brush holder after the sealing member formation of the same form. The perspective view of the brush holder before the sealing member formation of the same form. Sectional drawing which shows the formation process of the sealing member of the same form. Sectional drawing which shows the formation process of the sealing member of a comparative example.

Hereinafter, an embodiment of the motor will be described.
A motor M according to the present embodiment shown in FIG. 1 is used as a drive source for a power window device that electrically lifts and lowers a window glass of a vehicle. The motor M includes a motor unit 10 and a speed reduction unit 20.

The motor unit 10 includes a yoke housing 11, a magnet 12, an armature 13, a brush holder 14, and a brush 15.
The yoke housing 11 (hereinafter referred to as the yoke 11) has a bottomed flat cylindrical shape, and a flange portion 11b extending outward in the radial direction is formed in the opening portion 11a. The flange 11b sandwiches the brush holder 14 with an opening 21a of the gear housing 21 described later. A magnet 12 is fixed to the inner surface of the yoke 11, and an armature 13 is rotatably housed inside the magnet 12. The armature 13 has a rotating shaft 16, and the base end portion of the rotating shaft 16 is rotatably supported by a bearing 17 a assembled at the center of the bottom of the yoke 11. A cylindrical commutator 18 is fixed to the tip side portion of the rotating shaft 16.

  In the following description, unless otherwise specified, simply “axial direction” means the axial direction of the rotary shaft 16, and simply “radial direction” means the radial direction of the rotary shaft 16. It shall be.

  As shown in FIGS. 3 and 4, the brush holder 14 includes a holder main body portion 31 that is fitted into the opening 11 a of the yoke 11, a connector portion 32 that is exposed outside the motor M and is electrically connected to the outside, The holder main body 31 and the connecting portion 33 for connecting the connector portion 32 are integrally formed of resin.

  The holder main body portion 31 has a bottomed flat cylindrical shape, and a flange portion 31a extending radially outward is formed on the outer peripheral portion. A bearing 17b that rotatably supports a predetermined portion of the rotary shaft 16 is assembled at the center of the bottom of the holder body 31 (see FIG. 1). Further, the holder main body 31 holds the brushes 15 arranged to face each other across the central axis L of the motor unit 10 (rotating shaft 16) along the longitudinal direction of the main body 31. Each brush 15 is in sliding contact with a commutator 18 that rotates integrally with the rotary shaft 16 to supply power to the commutator 18.

  A seal member 35 is provided on the flange portion 31 a on the outer peripheral portion of the holder main body portion 31. The flange portion 31 a is a portion that is sandwiched between the opening portion 11 a of the yoke 11 and the opening portion 21 a of the gear housing 21, and is a hard resin resin molded body (main molded body) 34 that constitutes the main portion of the brush holder 14. On the other hand, a seal member 35 made of elastomer or the like is covered by integral molding (two-color molding). In other words, the resin portion of the brush holder 14 excluding the seal member 35 is the resin molded body 34. As shown in FIG. 2, when the yoke 11 is assembled to the gear housing 21, the seal member 35 is compressed at both openings 11 a and 21 a and is in close contact with both openings 11 a and 21 a. Thereby, intrusion of foreign matters from between the holder main body 31 and the yoke 11 and between the holder main body 31 and the gear housing 21 is prevented.

  As shown in FIGS. 1 and 2, the connector portion 32 is disposed radially outward from the holder main body portion 31 via the connecting portion 33, and is disposed outside the yoke 11 and the gear housing 21. The connector portion 32 of the present embodiment extends from the distal end portion of the coupling portion 33 toward the yoke 11 along the axial direction, and the distal end portion is a plug-in portion 32a having a cylindrical shape. The brush holder 14 holds a terminal 19 that extends from the connector portion 32 to the holder main body portion 31 through the inside of the connecting portion 33. One end of the terminal 19 is exposed inside the insertion portion 32 a and the other end is electrically connected to the pair of brushes 15. Then, an external connector (not shown) that is electrically connected to the power supply device is inserted into the insertion portion 32 a of the connector portion 32. The terminal 19 is electrically connected to an external connector inserted into the insertion portion 32a, and power is supplied from the external connector.

  As shown in FIGS. 3 and 4, the connecting portion 33 extends radially outward so as to be continuous with the flange portion 31 a of the holder main body portion 31, and the connector portion 32 is provided at the distal end portion. Further, an extending portion 41 that extends to both sides in the axial direction is provided at a substantially central portion in the radial direction of the connecting portion 33. In the brush holder 14 of the present embodiment, the axial extension amount of the extending portion 41 from the connecting portion 33 is set so that the gear housing 21 side is larger than the yoke 11 side. The extending portion 41 has a substantially rectangular plate shape in which the axially extending shape is substantially rectangular and the radial direction is thin. In addition, the seal member 35 is provided continuously from the flange portion 31 a of the holder main body 31 on the inner portion 33 a that is closer to the holder main body 31 than the extending portion 41 of the connecting portion 33.

  On the radially outer side surface (side surface of the connector portion 32) 41a of the extending portion 41, a rib 42 that extends to the base end of the connector portion 32 is formed. On the other hand, on the radially inner side surface 41 b of the extending portion 41, a contact portion 43 for contacting the flange portion 11 b of the yoke 11 and the housing 21 is formed. The contact portion 43 has a shape that protrudes radially inward and continues in the axial direction at both end edges of the extending portion 41 that is positioned so as to sandwich the connecting portion 33. The contact portion 43 includes a first contact portion 43a located on the yoke 11 side, and a second contact portion 43b located on the lower side in the axial direction (gear housing 21 side) than the first contact portion 43a. have. In the brush holder 14 of the present embodiment, the amount of protrusion of the first abutting portion 43a inward in the radial direction is larger than that of the second abutting portion 43b. When the yoke 11 and the gear housing 21 are assembled (see FIG. 2), the first contact portion 43a contacts the flange portion 11b of the yoke 11, and the second contact portion 43b contacts the outer surface 21b of the gear housing 21. Touch.

  Further, on the radially inner side surface 41 b of the extending portion 41, a step portion 44 is formed that crosses the connecting portion 33 so as to connect the contact portions 43 provided at both end edges. The step portion 44 includes a first step portion 45 provided on the upper side in the axial direction than the connecting portion 33 and a second step portion 46 provided on the lower side in the axial direction.

  The first step portion 45 has a short convex shape provided between the radially inner side surface 41b of the extending portion 41 and the connecting portion 33 (resin molded body 34), and forms a pair of first contact portions. It is provided continuously in a direction crossing the connecting portion 33 between 43a. Further, the first step portion 45 is provided continuously with the connecting portion 33 in the axial direction. Similarly to the first step portion 45, the second step portion 46 has a low-profile shape provided between the radially inner side surface 41b of the extension portion 41 and the connecting portion 33 (resin molded body 34). Are provided continuously in a direction crossing the connecting portion 33 between the second contact portions 43b.

  The radially inner side surface 46a of the second step portion 46 is flush with the second contact portion 43b in the radial direction. On the other hand, the radially inner side surface 45 a of the first step portion 45 is located on the radially inner side (on the holder main body portion 31 side) with respect to the radially inner side surface 46 a of the second step portion 46. The radially inner side surfaces 45a and 46a of the first and second step portions 45 and 46 regulate and closely contact the end portions of the seal member 35 that is integrally formed later. Further, the first and second step portions 45 and 46 protrude in the axial direction from the resin molded body 34 of the connecting portion 33, but the axial upper end surface 45 b of the first step portion 45 and the axial upper end surface of the seal member 35. 35a is flush with the axial lower end surface 46b of the second step 46 and the axial lower end surface 35b of the seal member 35 is flush with each other.

As shown in FIG. 1, the speed reduction unit 20 assembled integrally with the motor unit 10 includes a gear housing 21, a worm shaft 22, and a worm wheel 23.
The gear housing 21 is made of resin and is formed in a predetermined shape so as to accommodate the worm shaft 22 and the worm wheel 23 therein. The gear housing 21 has an opening 21 a that faces the opening 11 a (flange portion 11 b) of the yoke 11. The gear housing 21 and the yoke 11 are fixed with screws 50 in a state where the brush holder 14 (the flange portion 11b and the connecting portion 33) is sandwiched between the yoke 11 and the gear housing 21.

  The worm shaft 22 is connected to the rotating shaft 16 of the motor unit 10 and is rotatably supported by a bearing provided at a predetermined position in the gear housing 21. The worm shaft 22 is meshed with a worm wheel 23, and the worm wheel 23 is drivingly connected to an output shaft 24 arranged so as to be orthogonal to the worm shaft 22. The output shaft 24 is drivingly connected to a known X-arm type regulator (not shown) that opens and closes a window glass (not shown). When the rotating shaft 16 is rotated forward or backward by driving the motor unit 10, the output shaft 24 is rotated forward or backward accordingly, and the window glass is opened and closed through a regulator.

Next, the manufacturing method of the brush holder 14 in the motor M of this embodiment is demonstrated.
First, the case of the brush holder 70 of the comparative example shown in FIG. 6 will be described. The brush holder 70 of the comparative example is not provided with the stepped portion 44 with respect to the brush holder 14 of the embodiment.

  First, a hard resin molded body 71 of the brush holder 70 including the holder main body portion 31, the connector portion 32, the connecting portion 33, and the extending portion 41 and having the terminal 19 inserted therein is formed. That is, the resin molded body 71 of the brush holder 70 excluding the seal member 35 is molded. Next, a pair of molds X1 and X2 for molding the seal member 35 are disposed so as to sandwich the holder main body 31 in the resin molded body 71 from both axial sides. Then, a resin such as an elastomer is poured into the molds X1 and X2, and the seal member 35 is integrally formed with the resin molded body 71.

  Here, in the case of the brush holder 70 of the comparative example, the radial direction inner surface 41b of the extending portion 41 and the molds X1 and X2 are slightly in the radial direction so as not to interfere with each other. A clearance 60 is provided. That is, since the extended portion 41 of the brush holder 14 and the end portions of the molds X1 and X2 are not strictly in contact, the resin poured into the molds X1 and X2 leaks from the clearance 60, The seal member 35 may be molded to an unintended range. In this case, it is necessary to remove the excess sealing member 35 in the subsequent process.

On the other hand, the brush holder 14 of the present embodiment is provided with a stepped portion 44, which is used when the seal member 35 is integrally formed as shown in FIG.
First, similarly to the brush holder 70 of the comparative example, the hard resin molded body 34 of the brush holder 14 of the present embodiment is molded. Next, the pair of molds X1 and X2 are arranged so as to sandwich the holder main body 31 in the resin molded body 34 from both sides in the axial direction. At this time, the lower end surface X1a in the axial direction of the mold X1 disposed on the yoke 11 side is abutted against the upper end surface 45b in the axial direction of the first step portion 45, and on the axial direction of the mold X2 disposed on the gear housing 21 side. The end surface X <b> 2 a is abutted against the axial lower end surface 46 b of the second step portion 46. In such an arrangement manner of the molds X1 and X2, the elastomer resin is poured into the molds X1 and X2, and the seal member 35 is integrally molded with the resin molded body 34.

  Also in the case of the brush holder 14 of the present embodiment, a radial clearance 60 is provided between the radial inner side surface 41b of the extending portion 41 and the molds X1 and X2, similarly to the brush holder of the comparative example. However, the brush holder 14 of the present embodiment is provided with a step portion 44 for abutting the molds X1 and X2, and the lower end surface X1a in the axial direction of the mold X1 is the upper end surface 45b in the axial direction of the first step portion 45. The upper end surface X2a in the axial direction of the mold X2 comes into contact with the lower end surface 46b in the axial direction of the second step portion 46, and the ends of the molds X1 and X2 are sealed. Therefore, while providing a radial clearance 60 between the extension 41 of the brush holder 14 and the ends of the molds X1 and X2, the ends of the molds X1 and X2 are in contact with the stepped portion 44 in the axial direction. Since the ends of the molds X1 and X2 are sealed by the contact, leakage of the elastomer resin from the ends to the outside is suppressed, and consequently, the protrusion of the seal member 35 from the desired portion is suppressed.

Next, characteristic effects of the present embodiment will be described.
(1) A step portion 44 is provided on the radially inner side surface 41b of the extending portion 41 of the brush holder 14, and the molds X1 and X2 are brought into contact with the end surfaces 45b and 46b of the first and second step portions 45 and 46, respectively. The seal member 35 is integrally formed. As a result, the elastomer resin for molding the seal member 35 comes into contact with the stepped portion 44 (first and second stepped portions 45 and 46) and is prevented from leaking out from the molds X1 and X2, so that the seal member 35 is desired. It can suppress forming exceeding the range.

  (2) Since the seal member 35 is formed flush with the front end surface of the stepped portion 44 (the upper end surface 45b of the first stepped portion 45 and the lower end surface 46b of the second stepped portion 46), the molds X1, X2 Can be made into a simple shape.

  (3) Since the step portion 44 has a step shape provided between the radially inner side surface 41 b of the extending portion 41 and the connecting portion 33, the step portion 44 has high rigidity. Thereby, metal mold | die X1, X2 can be abutted with sufficient force with respect to the step part 44, and the leakage of elastomer resin can be suppressed more reliably.

  (4) In a state where the holder main body 31 is mounted between the openings 11a and 21a of the yoke 11 and the gear housing 21, the extending portion 41 includes the first contact portion 43a that contacts the yoke 11 and the gear. A second abutting portion 43b that abuts the housing 21 is provided. Thereby, the extension part 41 becomes a receiving of the load at the time of connecting an external connector to the connector part 32, and the displacement of the connector part 32 at the time of the connection can be suppressed.

  (5) Since the extension amount of the extension portion 41 from the connecting portion 33 is set larger on the gear housing 21 side than on the yoke 11 side, the connector portion 32 provided to extend to the yoke 11 side is provided. The load at the time of connecting an external connector can be effectively received by the extension part 41, and the displacement of the connector part 32 can be suppressed effectively.

  (6) Since the rib 42 extending to the base end of the connector portion 32 is formed on the radially outer side surface (side surface of the connector portion 32) 41a of the extending portion 41, the connector portion 32 when connecting the external connector is formed. Displacement hardly occurs.

In addition, you may change the said embodiment as follows.
In the above embodiment, the step portion 44 (first and second step portions 45, 46) that regulates the end portion of the seal member 35 has a step shape continuous from the extension portion 41. It may be a convex shape.

In the above embodiment, the first step portion 45 is protruded inward from the extension portion 41 rather than the second step portion 46. However, the protruding aspect may be reversed or the same.
In the above embodiment, the sealing member 35 is flush with the end surfaces 45b and 46b of the first and second step portions 45 and 46, and the end surfaces X1a and X2a of the molds X1 and X2 are simply flat. The end surfaces X1a and X2a of the molds X1 and X2 may be other than flat and the seal member 35 may have a shape other than the same as long as it can contact the end surfaces 45b and 46b of the portions 45 and 46.

  In the above embodiment, the connector portion 32 is applied to the brush holder 14 extending to the yoke 11 side. However, the connector portion 32 may be applied to a brush holder extending to the gear housing 21 side. In this case, the extension amount of the extension part 41 may be changed according to the direction in which the connector part 32 extends.

  In the above embodiment, the protruding amounts of the first and second contact portions 43a and 43b are different from each other, but may be appropriately changed according to the shapes of the yoke 11 and the gear housing 21. Moreover, you may provide in order to contact | abut only in any one side.

  DESCRIPTION OF SYMBOLS 10 ... Motor part, 11 ... York housing, 11a ... Opening part, 14 ... Brush holder, 15 ... Brush, 20 ... Reduction part, 21 ... Gear housing, 21a ... Opening part, 31 ... Holder main-body part, 31a ... Flange part ( (Surrounding portion), 32 ... connector portion, 33 ... connecting portion, 33a ... inside portion, 34 ... resin molded body (main molded body), 35 ... seal member, 41 ... extension portion, 41b ... radial inner side surface (inner side surface) ), 43 ... Abutting portion, 44 ... Stepped portion (convex portion), 45a, 46a ... Radial inner side surface (inner side surface), 45b ... Axial upper end surface (tip surface), 46b ... Axial lower end surface (tip surface) ), X1, X2 ... molds.

Claims (6)

Used for a motor in which a motor unit and a speed reduction unit are integrally assembled, and is arranged between openings of a yoke housing of the motor unit and a gear housing of the speed reduction unit to supply power into the motor unit. A holder main body for holding the brush, a connector located outside the yoke housing and the gear housing, for electrical connection to the outside, and a connection for connecting the holder main body and the connector And a seal member that is provided integrally with and seals the opening portions of the yoke housing and the gear housing in the peripheral portion of the holder main body portion and a part of the connecting portion. A holder,
The intermediate portion of the connecting portion has an extending portion that extends from the outer shape of the connecting portion, and the seal member includes an inner portion of the connecting portion that is closer to the holder body than the extending portion, and the Provided around the holder body,
A protruding portion that is shorter than the extending portion is provided at an inner position of the extending portion, and an end portion of the seal member is provided in contact with an inner surface of the protruding portion. Brush holder to do. The brush holder according to claim 1, wherein
The brush holder, wherein the sealing member is flush with a tip surface of the convex portion. The brush holder according to claim 1 or 2,
The brush holder, wherein the convex portion is a step portion provided between an inner surface of the extending portion and the connecting portion. In the brush holder as described in any one of Claims 1-3,
In a state where the holder main body is mounted between the openings of the yoke housing and the gear housing, the extension portion has a contact portion that contacts at least one side of the yoke housing and the gear housing. A brush holder comprising: In the brush holder according to any one of claims 1 to 4,
The connector portion is provided to extend to the yoke housing side,
The brush holder is characterized in that the extension amount of the extension portion from the connecting portion is set larger on the gear housing side than on the yoke housing side. The brush holder according to any one of claims 1 to 5, wherein the seal member is provided by integral molding,
The main part of the brush holder including the holder main body part, the connector part, the connection part, the extension part, and the convex part is prepared as a main molded body,
A mold for molding the seal member is disposed in a desired portion of the main molded body so as to abut against the convex portion, and a resin for the seal member is poured into the mold to end the seal member A method for manufacturing a brush holder, comprising: integrally molding the protrusion so as to be in contact with the convex portion.

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