JP3013765B2 - Brush holder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder device, and more particularly to a brush holder device which has improved assembly workability and reduced costs by sharing parts.

[0002]

2. Description of the Related Art FIG. 14 shows an example of a conventional brush holder device. In the figure, an annular brush holder plate 2 is housed in a motor housing 1 having a circular container shape, and a commutator portion 3 of a motor rotor is located in a center hole thereof. Brushes 4A, 4B, and 4C are in contact with the outer periphery of the commutator unit 3 at three locations in the circumferential direction. Each of the brushes 4A to 4C is supported by the coil spring 42 at the back and is urged toward the outer periphery of the commutator unit 3. ing.

One of the brushes 4C is at ground potential, and a pigtail 41 extending from the brush 4C is connected to the ground wire 16 on the brush holder plate 2. As shown in FIG. 15, one end of a pigtail 41 and a ground wire 16 are connected to a cylindrical terminal 23 inserted and locked in a mounting hole 22 provided in the brush holder plate 2 as shown in FIG.
This is done by caulking one end of the joint.

In addition, a motor having a large capacity often incorporates a circuit breaker in order to prevent seizure or the like during rotation restraint. In this case, as shown in FIG. The ground wire 16 is connected to one end of the circuit breaker 7 provided on the holder plate 2 and to the other end of the circuit breaker 7.

The circuit breaker 7 is installed, for example, as shown in FIG.
The circuit breaker 7 is inserted into the support leg 251 of the breaker holder 25, and is fixed. As an example of using a breaker holder to install a circuit breaker, Japanese Utility Model Application Laid-Open No. 58-59359,
Japanese Utility Model Laid-Open No. 5-50965 and the like.

[0006]

However, in any of the above-mentioned conventional devices, it is necessary to lead the ground wire connected to the vehicle stay into the motor housing through the grommet, and the assembly of the brush holder plate is performed by drawing the ground wire. There has been a problem that the attaching workability is impaired. In particular, co-crimping with a cylindrical terminal has poor workability, and since the caulking portion is floating from the plate surface of the brush holder plate, the mounting is unstable, and there is a possibility that disconnection or the like may occur due to the action of an external force.

Further, when a circuit breaker is installed, a breaker holder made of a heat-resistant resin having another structure is required in place of the tubular terminal, so that the assembling work and parts cannot be shared, and the manufacturing cost is reduced. Is increased. The present invention solves such a problem and realizes improvement of workability by eliminating the need for a work of routing a ground wire, and realizes a reduction in manufacturing cost by sharing parts regardless of the presence or absence of a circuit breaker. It is an object to provide a brush holder device.

[0008]

In the invention according to claim 1 Means for Solving the Problems], provided a conductive terminal member (6) made of a metal plate, said end
One end of the sub member (6 ) is fixed together with the brush holder plate (2) to the grounded motor housing (1) by a mounting member (5) having conductivity. In addition, the conductive end
The other end of the child element (6), with connecting pigtail (41) extending from the negative electrode brushes (4C), a conductive end
Position the child member (6) with respect to the brush holder plate (2).
The arrangement is fixed .

With this configuration, the terminal member is fixed to the motor housing at the same time when the brush holder plate is fixed, and the terminal member is grounded. By connecting the pigtail to such a terminal member, the brush is also grounded, so that it is not necessary to draw the ground wire into the motor housing as in the prior art, and the assembling workability is greatly improved.
According to the invention described in claim 2, the terminal member (6) is provided on the upright wall (6 ).
3) provided upright, by fixing the one terminal (71) of the circuit breaker (7) to the upstanding wall (63), said
One terminal (71) is electrically connected to the terminal member (6) to be in a ground state. Therefore, also in this case, it is not necessary to draw the ground wire into the motor housing, and workability is improved. Further, if the terminal member is used for fixing the circuit breaker, it can be used in common with parts in the case where no circuit breaker is provided, so that a breaker holder of another structure is not required, thereby reducing the manufacturing cost.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows the appearance of a wiper motor device having a brush holder device of the present invention. In the figure, a motor housing 1 is composed of a cylindrical yoke 11 and a gear housing 12 connected to one end surface of the cylindrical yoke. A worm that meshes with a worm gear provided on a motor rotating shaft (not shown) in the gear housing 12. The wheel is housed, and its central output shaft 13 projects from the gear housing 12.

A connector 14 is formed on the upper half of the front surface of the gear housing 12, and a lead wire 40 extending from the grommet 15 of the gear housing 12 is connected to the input.
The entire wiper motor device is fixed to the vehicle body by stays 121 projecting from four locations on the outer periphery of the gear housing 12.
6 is bolted to the vehicle body together with the stay 121 and grounded.

FIG. 2 is a cross-sectional view (cross section taken along the line II-II in FIG. 1) of the gear housing 12 viewed across the motor yoke 11.
Shown in Joint part 1 of gear housing 12 with yoke 11
Reference numeral 22 denotes a circular container body having substantially the same diameter as the opening of the yoke 11, and a disk-shaped resin brush holder plate 2 is provided inside the circular container body. The motor rotation shaft passes through the center opening of the brush holder plate 2, and the commutator 3 of the rotation shaft is located in the gear housing coupling portion 122.

Three brushes 4A, 4B and 4C are located on the brush holder plate 2 and are in contact with the outer periphery of the commutator 3 at three locations in the circumferential direction. Each brush 4A-4C
Is urged toward the outer periphery of the commutator unit 3 from behind by a torsion spring 42 provided on the brush holder plate 2 and is in pressure contact therewith. Two of the above brushes 4
A and 4B are high-speed and low-speed positive-electrode-side brushes, respectively. Pigtails 41 extending from these brushes 4A and 4B are connected to the lead wire 40 by swaging metal fittings 400, and the grommet 15 is connected through the lead wire 40. This leads to the connector section 14 (FIG. 1) described above. One of the brushes 4C is a common brush (negative-electrode-side brush) which is at ground potential, and a pigtail 41 extending from the brush 4C is connected to a lead plate 6 which is a terminal member provided on the brush holder plate 2. .

The lead plate 6 is an arm-shaped metal plate having a constant width and having a conductive shape and bent in a substantially elliptical shape.
It is a galvanized steel sheet of C material. As shown in FIG. 3, one end of the lead plate is fixed to the gear housing connecting portion 122 together with the brush holder plate 2 by the screw 5 inserted into the through hole 67, and is electrically connected to the gear housing 12 and grounded. As shown in FIG. 2, a crimping piece 61 is formed at the tip (the other end) of the lead plate 6.
A pigtail 41 extending from the common brush 4C is caulked.

On both side edges of the lead plate 6, locking claws 62 are bent at different positions in the longitudinal direction.
As shown in FIG. 4, the tip of the lead plate 6 is pressed into a mounting hole 21 provided in the brush holder plate 2 to prevent the lead plate 6 from positioning and floating. An upright wall 63 is provided on one side edge of the lead plate 6 by press molding, and is used for fixing the circuit breaker when it is installed.

According to the present embodiment, the lead plate 6 is provided, and the lead plate 6 is electrically connected to the gear housing 12 and grounded at the same time when the screw is fixed to the gear housing 12. 4C
A pigtail 41 extending from the end is connected by caulking. Therefore, unlike the related art, there is no need to pull in the ground wire from the outside via the grommet, and the brush holder plate 2 is not required.
As a result, the earth connection is made at the same time by fixing to the gear housing 12, so that the assembling workability is greatly improved. Further, since the lead plate is securely positioned on the brush holder plate, even if an external force acts, the caulking connection portion does not shift, and there is no risk of disconnection at this portion. (Second Embodiment) Another structure of the screw fixing portion of the lead plate 6 is shown in FIG. In the figure, the wall surface of the gear housing connecting portion 122 has a stepped protrusion 123 with a fixed width around the female screw into which the screw 5 is screwed. The plate surface of the lead plate 6 directly presses against the end surface.

According to such a structure, since the lead plate 6 reliably contacts the gear housing connecting portion 122 with a certain area, the reliability of conduction with the gear housing 12 is improved, and the connection between the screw 5 and the projecting portion 123 is improved. The lead plate 6 is more securely fixed by the metal surface contact. (Third Embodiment) Still another structure of the screw fixing portion of the lead plate 6 is shown in FIG. In the figure, a lead plate 6 has a cylindrical portion 6 formed by burring around a screw through hole.
4, and the thread of the screw 5 bites into the inner peripheral surface of the cylindrical portion 64. According to this structure, the contact reliability between the gear housing 12 and the lead plate 6 and the fixation of the lead plate 6 are more reliably ensured. (Fourth Embodiment) FIG. 7 shows a brush holder plate device having a built-in circuit breaker. In the figure, the circuit breaker 7 is provided on a lead plate 6. 9 to 1 show the detailed structure of the circuit breaker 7.
FIG. 9 is a front view of the circuit breaker 7, and FIG.
0 is a sectional view taken along line XX of FIG. 9, and FIG. 11 is a side view of the circuit breaker 7.

The circuit breaker 7 has a rectangular shape as a whole (FIG. 9), and has a deep metal dish 71 (FIG. 10).
Is provided. The opening of the case 71 is closed by a flat metal lid 72 with an insulating paper 73 interposed therebetween, and the lid 72 is bent at the upper and lower edges of the case 71.
2 and is fixed (FIG. 11). A caulking terminal 74 protrudes from the lower edge side surface of the lid 72, and one end of the pigtail 41 extending from the common brush 4C is connected to the caulking terminal 74 (FIG. 7). The case 71 is made of, for example, a galvanized steel plate made of SPCC material.

A part of the insulating paper 73 located inside the lid 72 is removed, and a fixed contact 721 provided on the inner surface of the lid 72 is formed.
The movable contact 751 provided at the end of the plate surface of the bimetal 75 is in electrical contact with the fixed contact 721. In the circuit breaker 7 having such a structure, the lower edge 712 of the bent case 71 is, as shown in FIG.
It is spot-welded at a plurality of locations in the longitudinal direction and fixedly supported on the vertical wall 63 of the lead plate 6 described in the first embodiment.

With such a structure, the common brush 4C
Is the lid 7 of the circuit breaker 7 from the pigtail 41
2, through the bimetal 75 and the case 71, to the lead plate 6 and to ground. When a large constraint current flows through the motor, the temperature of the bimetal 75 rises and deforms,
The movable contact 751 is separated from the fixed contact 721, and the energization path to the rotor coil of the motor is cut off.

According to the present embodiment, the circuit breaker 7 can be grounded without using a ground wire by spot welding the circuit breaker 7 to the lead plate 6,
The assembly workability is greatly improved. In addition, since the circuit breaker 7 is fixed and held by using the lead plate 6, a special breaker holder is not required unlike the related art, and the lead plate 6 having the same shape can be used even when the circuit breaker is not provided. Therefore, the parts can be shared, and the breath type can be shared, thereby reducing the manufacturing cost. (Fifth Embodiment) In FIG. 12, holding claws 65 and 66 are integrally formed on the lead plate 6 at front and rear positions on both side edges, and a circuit breaker 7 mounted on the lead plate 6 is shown in FIG. As shown in FIG.
5, 66 Hold and fix by the tip. At this time,
At the same time, the circuit breaker 7 conducts to the lead plate 6 via the holding claws 65 and 66.

According to this structure, in addition to the effect of the fourth embodiment, spot welding is not required, so that the assembling workability is further improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a wiper motor device to which the present invention is applied.

FIG. 2 is a partial cross-sectional front view of the brush holder device according to the first embodiment of the present invention, and a cross-sectional portion is along a line II-II in FIG.

FIG. 3 is a sectional view of a screw fixing portion of the lead plate according to the first embodiment of the present invention, which is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a cross-sectional view of the lead plate according to the first embodiment of the present invention, which is a cross-sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view of a screw fixing portion of a lead plate according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a screw fixing portion of a lead plate according to a third embodiment of the present invention.

FIG. 7 is a partial sectional front view of a brush holder device according to a fourth embodiment of the present invention.

FIG. 8 is a partial cross-sectional view of a circuit breaker fixed to a lead plate according to a fourth embodiment of the present invention, and the cross-sectional portion is along the line VIII-VIII in FIG.

FIG. 9 is a front view of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 10 is a horizontal sectional view of a circuit breaker according to a fourth embodiment of the present invention, taken along line XX of FIG. 9;

FIG. 11 is a side view of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 12 is a partial sectional front view of a brush holder device according to a fifth embodiment of the present invention.

FIG. 13 is a partial cross-sectional view of a circuit breaker fixed to a lead plate according to a fifth embodiment of the present invention, and the cross-sectional portion is along the line XIII-XIII in FIG.

FIG. 14 is a partial sectional front view of a brush holder device in a conventional example.

FIG. 15 is an enlarged side view of a connection portion between a pigtail and a ground wire in a conventional example, and is an enlarged side view of a portion A in FIG. 14;

FIG. 16 is a partial sectional front view of another conventional brush holder device.

FIG. 17 is an exploded side view of a circuit breaker installation portion in another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor housing, 12 ... Gear housing, 122
... Coupling part, 2 ... Brush holder plate, 3 ... Commutator part, 4C ... Brush, 5 ... Screw, 6 ... Lead plate,
7: circuit breaker, 71: case, 74: caulking terminal.

Claims (2)

(57) [Claims] 1. A grounded motor housing (1) having conductivity, a brush holder plate (2) made of an insulating material installed in the motor housing (1), and on the brush holder plate (2). And is brought into contact with the commutator (3) of the motor rotor by being biased by a spring.
A negative brush (4C) and a pigtail (4C) extending from the negative brush (4C);
1) a conductive mounting member (5) penetrating the plate surface of the brush holder plate (2) and reaching the motor housing (1); and a conductive terminal member (6) made of a metal plate. The conductive terminal member by the mounting member (5).
One end of (6) is fixed to the motor housing (1) together with the brush holder plate (2), and the other end of the conductive terminal member (6) is the pigtail.
(41) and the conductive terminal member
(6) is positioned with respect to the brush holder plate (2)
A brush holder device characterized in that it is fixed and fixed . 2. An upright wall (63) stands on the terminal member (6).
Are set, by fixing one terminal (71) of the circuit breaker (7) to the upstanding wall (63), said
Making one terminal (71) conductive to the terminal member (6);
The brush holder device according to claim 1, wherein the pigtail (41) to be connected to the terminal member (6) is connected to the other terminal (74) of the circuit breaker (7).