JP4340443B2 - motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor, and more particularly to a technique for assembling a brush holder stay provided with a brush device in a storage chamber formed in a motor housing, for example, a wiper motor used in a wiper device for wiping a window glass of an automobile. It relates to what is effective for use.
[0002]
[Prior art]
In general, a wiper device for wiping a window glass of an automobile includes a wiper motor as a wiper drive device for driving a wiper arm, and a motor with a worm gear reduction device is used as the wiper motor. In this type of conventional wiper motor, a motor shaft rotatably supported by a motor housing is inserted into a case of a worm gear speed reducer, and a brush device is installed in a storage chamber formed around the motor shaft of the motor housing. The brush holder stay provided is housed, and the lead wire for energizing the brush device is routed inside the case and collected by the female coupler on the motor side, and the wire on the vehicle body side by the male coupler wired on the vehicle body side. It is comprised so that it may be electrically connected to a harness (for example, refer patent document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-262515 [0004]
[Problems to be solved by the invention]
However, the above-described wiper motor has a problem in that the number of parts and the number of assembling steps increase because the brush holder stay is fixed to the storage chamber by a plurality of bolts.
[0005]
An object of the present invention is to provide a motor that can reduce the number of parts and the number of assembly steps.
[0006]
[Means for Solving the Problems]
A motor according to the present invention includes a motor unit having a motor shaft,
A brush holder stay provided with a brush device in sliding contact with a commutator fixed to the motor shaft;
A storage chamber in which the brush holder stay is stored and an insertion hole is opened;
A coupler body that protrudes in the longitudinal direction of the motor shaft at a right angle from the brush holder stay and is inserted into the insertion hole,
Wherein when the coupling body is inserted into the insertion hole, the engaging pawl that engages on the outlet side of the opening edge of the insertion hole, is formed on the motor shaft side surface of the coupling body,
The motor according to claim 1, wherein a fixing portion fixed to the storage chamber is disposed on the brush holder stay so as to sandwich the motor shaft with respect to the coupler main body.
[0007]
According to the above-described means, a part of the coupler main body is engaged with a part of the storage chamber, so that one side of the brush holder stay is fixed to the case by the engagement between the coupler main body and the storage chamber. As a result, only one side of the brush holder stay needs to be screwed, and as a result, the number of parts and the number of assembling steps can be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0009]
In the present embodiment, as shown in FIG. 1, the motor according to the present invention is configured as a wiper motor mounted on an automobile, and the wiper motor 1 includes a motor unit and a worm gear reduction device unit (hereinafter referred to as a gear unit). 70). The motor part 2 of the wiper motor 1 has a bottomed yoke (one case having a gear part provided with a speed reduction mechanism such as a worm wheel is fixed to the opening side end face of the yoke) 4 and the yoke 4. A plurality of magnets 6 arranged at equal intervals in the circumferential direction on the inner peripheral surface, a core 8 opposed to the magnet 6 group and fixed coaxially with the motor shaft 7, a coil wound around the core 8, and a core 8 and a commutator 9 disposed on the same axis as the motor shaft 7. A worm is formed at the tip of the motor shaft 7 on the side of the commutator 9 and is rotatably connected to the gear portion.
[0010]
In the end bracket 5 formed integrally with the case 71 of the gear portion 70, a storage chamber 10 is formed in a circular hole shape concentrically with the motor shaft 7, and the storage chamber 10 is shown in FIG. A brush holder stay 11 mounted on the brush device is fixed. That is, as shown in FIGS. 2 and 3, the brush holder stay 11 is made of a hard resin having an insulating property, and the main body 12 formed in a disk shape having a slightly smaller diameter than the storage chamber 10 is used. A circular window hole 13 having a diameter slightly larger than that of the commutator 9 is formed in a concentric circle at the center of the main body 12. As shown in FIG. 2, a pair of brush devices 14 and 14 are arranged and fixed on the end face of the main body 12 on the side of the commutator 9 so as to face each other. As shown in FIGS. 2 (e) and 2 (f), each brush device 14 includes a brush holder 15 installed to extend in a radial direction on a main body 12 formed in a rectangular tube shape, and a brush. A brush 16 held slidably in the radial direction by the holder 15; a brush spring 17 that urges the brush 16 in the radial direction to make sliding contact with the commutator 9; and a pigtail 18 electrically connected to the brush 16; It has. A cylindrical partition wall 19, which is substantially half cut out, is provided on the outer peripheral edge of the main body 12 so as to protrude concentrically so as to surround the outside and one side of the pair of brush devices 14, 14.
[0011]
As shown in FIG. 3, an insertion hole 20 is provided at a position perpendicular to the line segment connecting the pair of brush devices 14, 14 on the opposite side of the partition wall 19 of the main body 12. Corresponds to the female screw hole 21 formed on the bottom surface of the storage chamber 10 and into which the bolt 22 shown in FIG. At the position facing the insertion hole 20 on the end surface of the main body 12 opposite to the brush device mounting side, a main body (hereinafter referred to as coupler) of a motor-side female coupler integrally formed with the main body 12 in a substantially square rectangular tube shape. The coupler main body 24 is configured so as to be inserted into a rectangular insertion hole 23 (see FIG. 1) formed in the bottom surface of the storage chamber 10. An engaging claw 25 is projected from the side surface of the coupler body 24 on the insertion hole 20 side, and the engaging claw 25 is configured to engage with the opening end of the insertion hole 23. Then, after the coupler main body 24 is inserted into the insertion hole 23 and the engaging claw 25 is engaged with the opening edge on the outlet side of the insertion hole 23, the bolt 22 is inserted into the insertion hole 20 and screwed into the female screw hole 21. By doing so, the brush holder stay 11 is fixed to the storage chamber 10 as shown in FIG.
[0012]
As shown in FIG. 3, an insulating wall 26 is formed in the hollow portion of the coupler body 24 so as to divide the hollow portion into a first holding chamber 27 and a second holding chamber 28. A first insertion port 29 and a second insertion port 30 communicate with the first holding chamber 27 and the second holding chamber 28 at the end on the distal end side of the side wall of the coupler body 24 opposite to the engaging claw 25, respectively. Has been established to do. A first holding groove 31 and a second holding groove 32 are formed on the outer surfaces of the pair of side walls parallel to the insulating wall 26 of the coupler main body 24, respectively, and the end of the first holding groove 31 on the engagement claw 25 side is formed. A first slit 33 and a second slit 34 are elongated in the side and the end of the second holding groove 32 on the engaging claw 25 side. A first insertion port 35 and a second insertion port 36 are respectively opened at the ends of the first holding groove 31 and the first slit 33 and the ends of the second holding groove 32 and the second slit 34 in the main body 12. The first terminal piece 41 and the second terminal piece 42 are inserted into the first holding chamber 27 and the second holding chamber 28, respectively.
[0013]
Since the first terminal piece 41 and the second terminal piece 42 are configured symmetrically, the first terminal piece 41 shown in FIG. 4 will be described as a representative. As shown in FIG. 4, the first terminal piece 41 is formed by integrally pressing a conductive leaf spring such as a copper alloy by pressing, and has a main body 43 formed in a substantially rectangular flat plate shape. I have. A locking claw 44 is cut and raised at one end of the main body 43 into a substantially rectangular flat plate shape, and the locking claw 44 is locked at the opening edge of the first insertion port 35 of the coupler main body 24. Is set. By the locking of the locking claw 44 to the coupler main body 24, the movement of the first terminal piece 41 in the direction of the motor shaft 7 is restricted. Three embosses 45, 46, 47 are bulged on the outer side of the front end of the locking claw 44 in the main body 43, and the first emboss 45 disposed on the center line of the locking claw 44 is the locking claw 44. The second embossing 46 and the third embossing 47 swelled on the cut-and-raised side of the locking claw 44 respectively. Has been issued. A position restricting piece 48 is bent in a crank shape at the front of the locking claw 44 in the main body 43, and the position restricting piece 48 is set so as to contact the opening edge of the first insertion port 35 of the coupler main body 24. ing. A soldering piece 49 projects from the position restricting piece 48, and the soldering piece 49 is set so that the first connection portion 54 of the choke coil 52 can be soldered. At the end of the main body 43 opposite to the locking claw 44, a female connection piece 50 projects from the side opposite to the locking claw 44. The female connection piece 50 is formed in a substantially B-shaped cylindrical shape whose cross section is slightly smaller than the first insertion port 29 of the coupler main body 24, and rises in parallel with the main body 43. A rectangular hill-shaped pressing portion 51 is bulged and formed on the side of the main body 43 on the back wall located on the opposite side of the main body 43 of the female connecting portion piece 50, and the pressing portion 51 is formed on the female connecting portion piece 50. It is set so as to elastically hold the male connection piece (not shown) of the inserted male coupler on the vehicle body side.
[0014]
When the terminal piece 41 configured as described above is assembled to the coupler main body 24 according to the above-described configuration, the main body 43 has a portion for connecting the main body 43 and the female connection piece 50 to the holding groove 31 of the coupler main body 24. When the female connection piece 50 is inserted into the holding chamber 27 of the coupler main body 24 in the first slit 33 and the position restricting piece 48 comes into contact with the opening edge of the insertion opening 35, the locking claw 44 is inserted. The mouth 35 is locked to the opposite side of the opening edge. For this reason, the terminal piece 41 is in a state of being prevented from being detached from the coupler main body 24 by the locking claw 44 and the position restricting portion piece 48. In this state, as shown in FIG. 4 (f), the three embosses 45, 46, 47 of the main body 43 of the terminal piece 41 are in contact with the side walls on both sides of the holding groove 31 of the coupler main body 24. Therefore, the female connection piece 50 projecting from the opposite end of the main body 43 is in a state in which it can freely move in the holding chamber 27. Therefore, when the male coupler on the vehicle body side is mounted on the coupler main body 24 and the male connection piece (not shown) is inserted into the female connection piece 50, the female connection piece 50 has the embosses 45, 46, Since it moves in the holding chamber 27 with 47 as a fulcrum, errors such as machining errors and assembly errors can be absorbed. That is, since the female connection piece 50 moves freely following the insertion force of the male connection piece in the holding chamber 27, an error between the male and female couplers is absorbed. The female coupler and the male coupler on the vehicle body side can be coupled (coupled) without any trouble.
[0015]
Further, as shown in FIG. 5, a pair of choke coils 52, 52, a first connection plate 61 and a second connection plate 62 are mounted on the brush holder stay 11. The choke coil 52 includes a main body 53 wound in a coil shape, and a first connection portion 54 and a second connection portion 55 formed at a winding start end portion and a winding end end portion of the main body 53, respectively. The outer diameter of 53 is set so as to be fitted into a substantially semi-cylindrical holding cylinder 56 protruding perpendicularly to the end face of the brush holder stay 11 on the commutator side. The first connection portion 54 is configured to be soldered to the soldering piece 49 of the terminal piece, and the second connection portion 55 is configured to be soldered to the choke coil connection piece 64 of the connection plate. .
[0016]
Since the first connection plate 61 and the second connection plate 62 are configured symmetrically, the first connection plate 61 will be described as a representative. The connection plate 61 is integrally formed by pressing a conductive leaf spring such as a copper alloy, and includes a main body 63 formed in a substantially L-shaped flat plate shape. A choke coil connecting piece 64 is raised at one end of the main body 63 at a right angle, and a pigtail connecting piece 65 is projected from the other end on the same plane. The first connection plate 61 and the second connection plate 62 are respectively fitted in the first connection plate holding groove 66 and the second connection plate holding groove 67 of the main body 12 of the brush holder stay 11 shown in FIG. As shown in FIG. 2, the brush devices 14, 14 are assembled on the first connection plate 61 and the second connection plate 62. As shown in FIG. 5, the choke coil connection pieces 64 and 64 of the first connection plate 61 and the second connection plate 62 are connected to the second connection portions of the choke coils 52 and 52 fitted in the holding cylinder 56. 55 and 55 are soldered, respectively, and pigtails 18 and 18 of the brush devices 14 and 14 are soldered to the pigtail connection pieces 65 and 65, respectively.
[0017]
In turn, as shown in FIG. 1, the gear portion 70 in which the motor shaft 7 is inserted includes a case 71, and the case 71 is formed of a body 72 formed by aluminum die casting and a resin. The cover 73 is assembled and assembled in the middle. An end bracket 5 of the motor housing 3 is integrally formed in a cylindrical shape at an end portion of the main body 72 on the motor portion 2 side, and a dish-shaped gear is formed on an end surface of the end bracket 5 opposite to the motor portion 2 side. A storage portion 74 is provided at a right angle. A worm wheel 75 is arranged on a plane including the motor shaft 7 and is rotatably supported by the gear housing portion 74, and a worm 76 formed at an intermediate portion of the motor shaft 7 is engaged with the worm wheel 75. . A wiper shaft 77 is fixed to the center line of the worm wheel 75 so as to be orthogonal to the motor shaft 7 and rotatably supported by the main body 72. The wiper shaft 77 is a link mechanism (not shown) of the wiper device. ).
[0018]
According to the wiper motor configured as described above, the following effects can be obtained.
[0019]
1) In the operation of installing the brush holder stay 11 in the storage chamber 10 of the end bracket 5 of the motor housing 3, the coupler main body 24 of the brush holder stay 11 is inserted into the insertion hole 23 of the storage chamber 10, and the engaging claw 25 is After engaging the opening edge on the outlet side of the insertion hole 23, the bolt 22 is inserted into the insertion hole 20 of the brush holder stay 11 and screwed into the female screw hole 21, whereby the brush holder stay 11 is inserted into the storage chamber 10. Since the brush holder stay can be fixed to the motor housing with two bolts, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost of the wiper motor can be reduced. Can do.
[0020]
2) When the male coupler on the vehicle body side is attached to the female coupler on the motor side provided with the coupler main body 24 and the male connection piece is inserted into the female connection piece 50, the female connection piece 50 is held. By following the insertion force of the male connection piece in the chamber 27, the error between the male and female couplers is absorbed, so the female coupler on the motor side and the male coupler on the vehicle body side can be coupled without any trouble. can do.
[0021]
Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
[0022]
For example, although the case where the present invention is applied to a wiper motor has been described in the above embodiment, the present invention is not limited to this, and can be applied to all motors used for other purposes.
[0023]
【The invention's effect】
As described above, according to the present invention, after the coupler main body of the brush holder stay is inserted into the storage chamber and the engaging claw is engaged with the opening edge on the outlet side of the insertion hole, the insertion of the brush holder stay is performed. Since the brush holder stay can be fixed to the motor housing by inserting a bolt into the hole and screwing, the number of parts and the number of assembling steps can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan sectional view showing a wiper motor according to an embodiment of the present invention.
FIGS. 2A and 2B show a brush device mounting brush holder stay, wherein FIG. 2A is a front view seen from the motor side, FIG. 2B is a plan view, FIG. 2C is a rear view, and FIG. Sectional drawing which follows a dd line | wire, (e) is the e arrow directional view of (a), (f) is sectional drawing which follows the ff line of (e).
3A and 3B show a brush holder stay, where FIG. 3A is a front view as viewed from the motor side, FIG. 3B is a plan view, FIG. 3C is a rear view, and FIG. Sectional drawing which follows a line, (e) is a side view, (f) is sectional drawing which follows the ff line | wire of (e).
4A and 4B show a first terminal piece, in which FIG. 4A is a front view seen from the motor side, FIG. 4B is a plan view, FIG. 4C is a rear cross-sectional view, and FIG. e) is a right side view, and (f) is a cross-sectional view taken along the line ff of (d) when assembled to the coupler main body.
5A and 5B show a brush holder stay to which a choke coil and a connection plate are mounted, wherein FIG. 5A is a front view seen from the motor side, and FIG. 5B is a cross-sectional view taken along line bb in FIG. It is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wiper motor (motor), 2 ... Motor part, 3 ... Motor housing, 4 ... Yoke, 5 ... End bracket, 6 ... Magnet, 7 ... Motor shaft, 8 ... Armature core, 9 ... Commutator, 10 ... Storage chamber, 11 DESCRIPTION OF SYMBOLS ... Brush holder stay, 12 ... Main body, 13 ... Window hole, 14 ... Brush device, 15 ... Brush holder, 16 ... Brush, 17 ... Brush spring, 18 ... Pigtail, 19 ... Partition wall, 20 ... Insertion hole, 21 ... Female thread Holes, 22 ... bolts, 23 ... insertion holes, 24 ... coupler body (female coupler body on the motor side), 25 ... engaging claw, 26 ... insulating wall, 27 ... first holding chamber, 28 ... second holding chamber, 29 ... first insertion port, 30 ... second insertion port, 31 ... first holding groove, 32 ... second holding groove, 33 ... first slit, 34 ... second slit, 35 ... first insertion port, 36 ... first Double entrance, 41 ... One terminal piece, 42 ... second terminal piece, 43 ... main body, 44 ... locking claw, 45, 46, 47 ... embossing, 48 ... position regulating piece, 49 ... soldering piece, 50 ... female connection piece , 51 ... holding part, 52 ... choke coil, 53 ... main body, 54 ... first connection part, 55 ... second connection part, 56 ... holding cylinder, 61 ... first connection plate, 62 ... second connection plate, 63 ... Main body, 64 ... Choke coil connection piece, 65 ... Pigtail connection piece, 66 ... First connection plate holding groove, 67 ... Second connection plate holding groove, 70 ... Gear part, 71 ... Case, 72 ... Main body, 73 ... Cover, 74 ... gear housing, 75 ... worm wheel, 76 ... worm, 77 ... wiper shaft.

Claims (1)

A motor unit having a motor shaft;
A brush holder stay provided with a brush device in sliding contact with a commutator fixed to the motor shaft;
A storage chamber in which the brush holder stay is stored and an insertion hole is opened;
A coupler main body that protrudes in the longitudinal direction of the motor shaft at a right angle from the brush holder stay and is inserted into the insertion hole,
Wherein when the coupling body is inserted into the insertion hole, the engaging pawl that engages on the outlet side of the opening edge of the insertion hole, is formed on the motor shaft side surface of the coupling body,
The motor according to claim 1, wherein a fixing portion fixed to the storage chamber is disposed on the brush holder stay so as to sandwich the motor shaft with respect to the coupler body.

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