JPH0649097Y2 - Motor circuit breaker storage structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a circuit breaker housing structure for a motor, for example, a structure effectively used for a drive motor of a wiper drive device.

[Conventional technology]

Various electric parts such as an armature, a magnet, a choke coil, a brush device, etc. are used in the drive motor of the wiper drive device, and among these electric parts, the electric parts constituting the brush device are the parts of the brush holder cover. It is stored in the inner space. A circuit breaker is housed in the brush holder cover together with the choke coil.

Conventionally, the following structure has been proposed as a circuit breaker housing structure of a motor in which an L-type open type circuit breaker is housed in a brush holder cover. That is, when accommodating the L-type open type circuit breaker, a mounting hole is formed in the circuit breaker in advance, and the circuit breaker is screwed to a part of the brush holder cover by using this mounting hole, or rivets are used. The structure to stop.

[Problems to be solved by the device]

However, in such a circuit breaker housing structure of a motor, a fastening member such as a screw or a rivet is required, and a process for caulking or fastening these members is required, which results in the assembly of parts. Therefore, there is a problem that it takes time.

An object of the present invention is to provide a circuit breaker storage structure for a motor, which allows the circuit breaker to be assembled without using a fastening member.

[Means for Solving the Problems]

The motor circuit breaker storage structure according to the present invention is
In a circuit breaker housing structure for a motor that houses an L-shaped open type circuit breaker, a substantially rectangular parallelepiped hole-shaped recess is formed in the base of a brush holder cover that is arranged so as to surround the brush device of the motor. The circuit breaker is housed in the place, a first guide groove is formed on the opening end side of one side wall surface of the recess, and one end side of the circuit breaker is inserted into the first guide groove. A second guide groove is formed on the bottom side of the second side wall surface farther from the first guide groove on the side wall surface of the recess adjacent to the first guide groove, and the other end of the circuit breaker is formed in the second guide groove. Further, a lock piece having a lock claw protruding from the tip is provided upright from the bottom surface side to the open end side on the side wall surface of the recess facing the first guide groove. An upper end piece of the circuit breaker is locked to the claw.

[Action]

According to the above-mentioned means, when the circuit breaker is housed in the recess, the circuit breaker is inserted along the first guide groove and then inserted along the second guide groove. At this time, bend the lock piece away from the circuit breaker. Then, after the circuit breaker is inserted into the recess, when the lock piece is returned to its original state, the lock claw comes into contact with the upper end piece of the circuit breaker,
The circuit breaker can be fixed in the recess.
Therefore, the circuit breaker can be fixed in the recess by a simple operation without using a fastening member.

〔Example〕

FIG. 1 is a partially cutaway perspective view showing a circuit breaker housing structure of a motor according to an embodiment of the present invention, FIG. 2 is an enlarged partial exploded perspective view thereof, and FIG. 3 is a plan view showing a brush holder cover, 4 is a bottom view thereof, FIG. 5 is a front sectional view thereof, FIGS. 6 (a), (b), 7 (a), (b),
FIGS. 8 (a) and 8 (b) are vertical cross-sectional views and horizontal cross-sectional views for explaining the procedure for assembling the circuit breaker, and FIG. 9 shows a wiper drive device using a brush holder cover. FIG. 3 is a vertical cross-sectional view showing a drive motor, with some parts omitted.

In this embodiment, the circuit breaker housing structure of the motor according to the present invention is a driving motor of a wiper driving device and is configured to house the circuit breaker in a brush holder cover.

The drive motor 10 includes a housing 11. The housing 11 is covered with a yoke 12 formed in a substantially cylindrical shape with one end surface opened and the other end closed, and the opening side of the yoke 12. It is composed of an end bracket 13. Oil-impregnated bearing metals (hereinafter, sometimes referred to as bearing metals) 15 and 16 as bearing members are arranged in the closing wall 14 of the yoke 12 and in the center of the end bracket 13, respectively. Is a metal holder 17, 18
Respectively held by. Inside the housing 11, a rotor shaft 19 is installed on the center line.
19 is rotatably supported by both bearing metal members 15 and 16. An armature 20 is fixedly mounted on the rotor shaft 19 in an intermediate portion, and the armature 20 faces a plurality of magnets 21 arranged on the inner peripheral surface of the yoke 12 at substantially equal intervals in the circumferential direction. It is arranged as follows. A commutator 22 for supplying electric power to the armature 20 is arranged on the rotor shaft 19 and fixed to the end portion on the end bracket 13 side. A gear box (not shown) is arranged on the end bracket 13 on the opposite side of the yoke 12 and is integrally connected to the end bracket 13. The rotor shaft 19 is inserted in the gear box and the gear box It drives a worm gear reduction mechanism installed inside (not shown).

A recess 23 for accommodating the brush holder stay is recessed in the end surface of the end bracket 13 on the yoke side at a constant depth in the axial direction. A brush holder stay 25 is accommodated in the recess 23 via a brush holder cover 24.

The brush holder stay 25 is integrally formed by using Bakelite, and is formed into a substantially disc shape to be fitted into the inner periphery of the side wall portion 42 of the brush holder cover 24. The brush holder stay 25 has three brush holders 26 radially arranged around the commutator insertion port 25a and fixed therein. Are slidably accommodated so as to be in sliding contact with the outer peripheral surface of the commutator 22.

In this embodiment, the circuit breaker 30 is configured as an L-shaped open type, and is provided with a main body 31 which is formed into an angle shape by pressing using a conductive thin plate such as a copper-based material. . A fixed contact 32 is electrically insulated from the main body 31 by an insulating plate 33 and fixed to one end (hereinafter, referred to as an upper end) of the main body 31, and a mounting piece 34 is attached to the fixed contact 32. It is projected in a right angle direction.
The pigtail 27 of one brush 28 is connected to the tip of the mounting piece 34. On the other hand, there is a small hole at the bottom of the body 31.
A plurality of 35 are provided, and a lead wire (not shown) is electrically connected to one of the small holes 35. In addition, a bimetal 36 is installed on the main body 31 from the fixed contact 32 toward the lower end of the main body 31.
The 36 allows the function of the circuit breaker to be substantially implemented.

The brush holder cover 24 is made of synthetic resin and is integrally formed. The base 41 is formed in a disk shape having substantially the same diameter as the recess 23 of the end bracket 13, and a right angle is provided on the outer periphery of the base 41. And a side wall portion 42 that is erected. The base 41 of the brush holder cover 24 is provided with a rotor shaft insertion opening 43 arranged on the center line, and the insertion opening 43
A short cylindrical enclosing wall portion 44 is concentrically arranged at the opening edge of and is erected on the base 41. Brush holder cover
In the inside of 24, there are three storage recesses 46 for storing the choke coil 45 as an accessory electric component, which are arranged radially at appropriate intervals in the circumferential direction on the bottom surface of the base 41 so as to open vertically. Is formed in.

Each storage part 46 has a choke coil wound in a bobbin shape.
45 are inserted from the opening side of the brush holder cover 24 and are fixedly stored.

In this embodiment, a circuit breaker holding wall 51 is arranged on the base 41 of the brush holder cover 24 at a position adjacent to one of the choke coil housing recesses 46, and is integrally projected upwardly. A circuit breaker storage recess 52 is opened upward in the wall 51, and is formed in a substantially rectangular parallelepiped hole shape capable of housing the circuit breaker 30 having the above configuration. The four side wall surfaces 53, 54, 5 of the storage recess 52
Of the five and 56, a pair of first guide walls 57 are disposed on the first side wall surface 53 located on the radially inner side, and the first guide walls 57 are arranged near the upper end portion thereof so as to extend parallel to each other and vertically. And the first guide groove 58 is formed to have a short length by the gap between the guide walls 57, 57. A second guide wall 59 is formed in the recess 52 on the second side wall surface 54 adjacent to the first side wall surface 53 on the choke coil housing recess 46 side.
Of the guide wall, which is disposed at the bottom of the guide wall and is parallel to the third side wall surface 55 adjacent to the second side wall surface 54 on the opposite side.
Due to the gap between the 59 and the third side wall surface 55, the second guide groove 60
Has a short length. Further, a lock piece 61 is erected parallel to the fourth side wall surface 56 at a corner portion where the third side wall surface 55 and the fourth side wall surface 56 are adjacent to each other.
A lock claw 62 is provided on the upper end of the projection so as to project toward the second side wall surface 54.

Next, an operation and an operation of assembling the circuit breaker having the above-described configuration to the brush holder cover 24 will be described.

When the circuit breaker 30 is stored in the storage recess 52 of the brush holder cover 24, as shown in FIG.
First, the lower end of the circuit breaker 30 is inserted into the first guide groove 58 with the tip end of the lock piece 61 bent. At this time, a lead wire (not shown) has already been soldered to the small hole 35, but since the first guide groove 58 is formed short at the top, it does not hinder the insertion.

Subsequently, as shown in FIG. 7, the circuit breaker 30 is moved to the bottom side. At this time, even if the bending of the lock piece 61 is released and the lock piece 61 is returned to the original state, the lock piece 61 is still pressed by the circuit breaker 30.

Then, as shown in FIG. 7, when the circuit breaker 30 moves to the bottom side of the recess 52, the lower end of the circuit breaker 30 is located between the second guide wall 59 and the third side wall surface 54. It is inserted into the second guide groove 60.

When the circuit breaker 30 is further inserted in this state, as shown in FIG.
The lower end side of 30 abuts on the bottom surface of the storage recess 52. At this time,
The lock piece 61 contacts the upper end of the circuit breaker 30,
The circuit breaker 30 is locked by the lock claw 62, and the circuit breaker 30 is fixed in the storage recess 52.

As described above, according to this embodiment, the circuit breaker 30 can be inserted and fixed in the storage recess 52 with one touch without using a fastening member such as a screw or a rivet. The attaching work can be performed easily and the workability can be improved.

[Effect of device]

As described above, according to the present invention, by inserting the circuit breaker along the first guide groove and the second guide groove, the circuit breaker can be mounted in the accommodation recess and locked by the locking claw. Therefore, the circuit breaker can be securely fixed in the recess without using a fastening member, and the assembling work of the circuit breaker can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a circuit breaker housing structure of a motor according to an embodiment of the present invention, FIG. 2 is an enlarged partial exploded perspective view thereof, and FIG. 3 is a plan view showing a brush holder cover, 4 is a bottom view thereof, FIG. 5 is a front sectional view thereof, FIGS. 6 (a), (b), 7 (a), (b),
8 (a) and 8 (b) are vertical cross-sectional views and horizontal cross-sectional views for explaining the procedure of assembling the circuit breaker, and FIG. 9 shows a wiper drive device using a brush holder cover. FIG. 3 is a vertical cross-sectional view showing a drive motor, with some parts omitted. 10 ... Wiper drive drive motor, 11 ... Housing, 12 ... Yoke, 13 ... End bracket, 15, 16 ...
… Bearing metal, 17, 18 …… Metal holder, 19 …… Rotor shaft, 20 …… Armature, 21 …… Magnet, 22 …… Commitator, 23 …… Brush holder stay housing recess, 24 ……
Brush holder cover, 25 ...... Brush holder stay, 26 ...
… Brush holder, 27 …… Pigtail, 28 …… Brush, 29
...... Brush spring, 30 ...... Circuit breaker, 31
…… Main body, 32 …… Fixed contact, 33 …… Insulation plate, 34 …… Mounting piece, 35 …… Small hole, 36 …… Bimetal, 41 …… Base,
42 ... Side wall part, 43 ... Rotor shaft insertion port, 44 ... Enclosing wall,
45 …… Choke coil (auxiliary electrical component), 46 …… Supplemental electrical component storage, 51 …… Retaining wall, 52 …… Circuit breaker storage recess, 53, 54, 55, 56 …… Side wall surface, 57 …… First guide wall, 58 ... First guide groove, 59 ... Second guide wall, 60
…… Second guide groove, 61 …… Lock piece, 62 …… Lock claw.

Claims (1)

[Scope of utility model registration request] 1. In a circuit breaker housing structure for a motor for housing an L-shaped open type circuit breaker, a substantially rectangular parallelepiped hole-shaped recess is formed in a base of a brush holder cover arranged so as to surround a brush device of the motor. It is opened, and the circuit breaker is housed in this recess. A first guide groove is formed on the opening end side of one side wall surface of this recess, and one end side of the circuit breaker is inserted into this first guide groove. A second guide groove is formed on the bottom side of the second side wall surface farther from the first guide groove of the recess side wall surface adjacent to the first guide groove, and the circuit is formed in the second guide groove. The other end of the breaker is inserted, and further, a lock piece is provided upright from the bottom surface side to the opening end side with a lock claw protruding from the tip on the side wall surface of the recess facing the first guide groove. The circuit breaker storage structure for a motor, wherein the upper end of the circuit breaker is locked by the lock claw.