JPH0441747Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a brush device for a small motor, in particular, a carbon brush that is slidably installed in a brush housing groove provided in the brush holder main body is attached to a spring. This invention relates to a brush device for a small motor configured to slide on a commutator while being elastically pressed by a brush.

[Conventional technology]

Conventionally, as shown in FIGS. 3 to 5, a carbon brush that is slidably installed in a brush holder is configured to slide on a commutator while being elastically pressed by a spring. A brush device using a small motor is known.

The conventional examples shown in FIGS. 3 and 4 are small motor brush devices having basically the same configuration. That is, spring 1 is a brush.
It is held by a spring holder 3 provided in the holder body (a part of a small synthetic resin motor case described later) 2, and one end of the spring 1 (hereinafter referred to as a locking part) 1-1 is connected to a brush. The other end (hereinafter referred to as the pressing part) 1 is locked to a spring locking piece 7 provided on the holder 4 (shown in Figure 3) and the brush holder 5 (shown in Figure 4).
-2 is configured to press the carbon brush 8 slidably housed in the brush holders 4 and 5 in the direction of the commutator 9 (in the direction of the arrow in the figure). The small motor (not shown) to which the above conventional example and the present application are applied is a cylindrical metal case with one end closed and the other end open (referred to as a large motor case in correspondence with the small motor case described later). ), and a permanent magnet for field formation is attached along the inner peripheral surface of the motor large case, and
A bearing that supports one end of the rotor shaft is installed on the closed end face of the large motor case. Also,
A rotor core around which a rotor winding is wound and the commutator 9 are fixed to the rotor shaft. The aforementioned small motor case holds the brush device so as to slide on the commutator 9, and is also equipped with a bearing that supports the other end of the rotor shaft, and is fitted into the opening of the large motor case. It is a so-called lid plate made of synthetic resin so as to fit together. That is, the small motor is configured such that both ends of the rotor shaft are supported by bearings installed in the large motor case and bearings installed in the small motor case. The rotor core faces the permanent magnet, and the brush device is configured to slide on the commutator 9.

In the conventional example shown in FIG. 5, a carbon brush 8 is slidably housed in a substantially box-shaped brush holder 6, and the brush holder 6 is detachably attached to the carbon brush 8. A spring 10 is provided between the bottom plate 6-1 and the bottom plate 6-1. Incidentally, reference numeral 11 in FIG. 5 is a setting jig to be described later, which is used when the assembled brush device is in stock.

[The problem that the idea attempts to solve]

The conventional examples shown in Figures 3 and 4 use a brush holder manufactured by processing a metal plate into a U-shape, an L-shape, etc., which requires a large number of processing and assembly man-hours. , which has the problem of being disadvantageous in terms of cost.

The present invention was developed in view of the above-mentioned problems, and its purpose is to provide a brush device for a small motor that can reduce the number of parts and assembly man-hours. be.

Further, when the brush device is stored in a set state, the carbon brushes are not fixed, so when the set brush device is carried, there is a risk that the carbon brushes may move and be damaged.
Therefore, measures have been taken, such as removing the carbon brush and storing it separately, or fixing the carbon brush 8 using a setting jig 11, as shown in FIG. In this case, a setting jig is required and the number of parts increases, which is an undesirable problem.

The present invention was developed in view of the above-mentioned problems, and its purpose is to create a small motor that can be kept in stock as a set and that can reduce the number of parts. The present invention aims to provide a brush device.

[Means to solve the problem]

The brush device for a small motor of the present invention includes a carbon brush, a brush holder main body having a brush housing groove in which the carbon brush is slidably accommodated, and a spring that presses the carbon brush, In a brush device for a small motor configured such that the carbon brush slides on a commutator while being elastically pressed by the spring, the brush accommodating groove of the brush holder body is arranged at a height of the carbon brush. The brush holder body is formed to have a depth that is approximately the same as the dimensions, and the brush holder body is
a spring holder that supports the spring;
The spring includes a spring locking piece to which one end of the spring is locked, and the spring is locked to the spring locking piece such that one end of the spring straddles the brush housing groove, and the other end is locked to the spring locking piece. It is characterized by being configured to press the carbon brush in the direction of the commutator.

Further, the carbon brush has a spring locking groove formed by being drilled in a direction crossing the pressing direction of the spring, and the other end of the spring is on the commutator side of the spring locking groove. The brush holder body is configured to press against a wall surface, and has a spring regulating protrusion that regulates the position of the other end of the spring, and the other end of the spring is locked to the spring regulating protrusion. By forcibly locking the other end of the spring with the wall surface of the spring locking groove on the side opposite to the commutator side, and releasing the locking state between the other end of the spring and the spring regulating protrusion. The other end of the spring is configured to press the carbon brush toward the commutator. This will be explained below with reference to the drawings.

〔Example〕

FIG. 1 is an explanatory diagram of one embodiment of the brush device of the present invention, FIG. 1A is a perspective view, FIG. 1B is a plan view, and FIG. 2 is another embodiment of the brush device of the present invention. FIG. 2A is a perspective view, and FIG. 2B is a plan view. Reference numeral 12 in the figure represents a brush housing groove, 13 a spring locking groove, 14 a spring regulating protrusion, 15 a spring removal hole, and other reference numerals correspond to FIGS. 3 to 5.

In the embodiment shown in FIGS. 1A and 1B, the brush holder main body 2 (a part of the small motor case made of synthetic resin described at the beginning of this specification) is a brush holder in which a carbon brush is slidably accommodated. It has grooves 12. The brush housing groove 12 is
It is formed to have a depth that is approximately the same as the height of the carbon brush 8. Further, a spring holder 3 for supporting a spring 1 is integrally formed in the brush holder main body 2, and the spring 1 is supported by the spring holder 3. The locking portion 1-1 of the spring 1 is connected to the brush.
The pressing part 1 of the spring 1 is locked by a metal spring locking piece 7 provided on the holder body 2.
-2 is configured to press the carbon brush 8 slidably housed in the brush housing groove 12 in the direction of the commutator 9 (in the direction of the arrow in the figure). As mentioned above, the brush housing groove 12
is formed to have a depth that is approximately the same as the height dimension of the carbon brush 8,
The locking portion 1-1 of the spring 1 is locked to the spring locking piece 7 in a state where it is close to contacting the upper surface of the carbon brush 8. Therefore, the carbon brush 8 is pressed against the commutator 9 without being lifted up.

The embodiment shown in FIG. 2 basically has the same structure as the embodiment shown in FIG. Although the state of use of the embodiment shown in FIG. 2 is not shown, by releasing the locked state between the pressing portion 1-2 of the spring 1 and the spring regulating protrusion 14, which will be described later, as shown in FIG. Similar to the example,
The pressing portion 1-2 is configured to press the carbon brush 8 toward the commutator.

In the embodiment shown in FIG. 2, the carbon brush 8 has a spring locking groove 13 formed by being bored in a direction crossing the pressing direction of the spring, and also regulates the position of the pressing portion 1-2 of the spring 1. In order to bring the tip of the pressing portion 1-2 of the spring 1 into contact with the wall surface of the spring locking groove 13 on the side opposite to the commutator 9, the spring regulating protrusion 14 is attached to the brush holder body 2. It's profitable. Therefore, by forcibly locking the pressing portion 1-2 of the spring 1 with the spring regulating protrusion 14, the tip of the pressing portion 1-2 of the spring 1 engages with the commutator 9 of the spring locking groove 13. It will be in contact with the opposite wall. That is, the pressing portion 1 of the spring 1
-2, the carbon brush 8 is fixed and the carbon brush 8 does not move even when the set brush device is carried around, so it is possible to stock the brush device in the set state.

In the embodiment shown in FIG. 2, the spring 1 is
The spring removal hole 15 is located at a position where the pressing part 1-2 can be pushed up in the direction of the arrow shown in FIG. is being made. Therefore, insert the rod-shaped jig into the spring removal hole 15, push up the pressing part 1-2 of the spring 1 in the direction of the arrow shown in FIG. By releasing the engagement state with the protrusion 14, the pressing portion 1-2 of the spring 1 causes the carbon fiber to be released.
The brush 8 is pressed toward the commutator.

[Effect of idea]

As described above, according to the present invention, it is possible to reduce the number of parts and the number of assembly steps, and it is also possible to provide a brush device for a small motor that can be kept in stock as set.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the brush device of the present invention, FIG. 1A is a perspective view, FIG. 1B is a plan view, and FIG. 2 is another embodiment of the brush device of the present invention. FIG. 2A is a perspective view, and FIG. 2B is a plan view. 3 to 5 show explanatory diagrams of conventional examples. In the figure, 1 is a spring, 1-1 is a locking part, 1-
2 is a pressing part, 2 is a brush holder body, 3 is a spring holder, 7 is a spring locking piece, 8
9 is a carbon brush, 9 is a commutator, 12 is a brush housing groove, 13 is a spring locking groove, 14 is a spring regulating projection, and 15 is a spring removal hole.

Claims (1)

[Claims for Utility Model Registration] (1) Carbon brush 8 and brush housing groove 12 in which the carbon brush 8 is slidably accommodated.
and a spring 1 that presses the carbon brush 8, and the carbon brush 8 is configured to slide on the commutator 9 while being elastically pressed by the spring 1. In the brush device for a small motor, the brush accommodating groove 12 of the brush holder main body 2 is formed to have a depth that is approximately the same as the height dimension of the carbon brush 8, and The holder body 2 includes a spring holder 3 that supports the spring 1, and a spring locking piece 7 to which one end of the spring 1 is locked. A small motor characterized by being locked to the spring locking piece 7 so as to straddle the housing groove 12, and having the other end 1-2 press the carbon brush 8 toward the commutator. brush equipment. (2) A carbon brush 8 and a brush housing groove 12 in which the carbon brush 8 is slidably accommodated.
and a spring 1 that presses the carbon brush 8, and the carbon brush 8 is configured to slide on the commutator 9 while being elastically pressed by the spring 1. In the brush device for a small motor, the carbon brush 8 is provided with a spring locking groove 13 formed by being bored in a direction crossing the pressing direction of the spring 1; The other end 1-2 is configured to press against the wall surface of the spring locking groove 13 on the commutator side, and the brush holder main body 2 is a spring that restricts the position of the other end 1-2 of the spring 1. The spring 1 is provided with a regulating protrusion 14.
The other end 1-2 is connected to the spring regulating protrusion 14.
The other end 1-2 of the spring 1 is forced into the spring locking groove 1 by locking the spring 1 into the spring locking groove 1.
3, and the other end 1-2 of the spring 1 is released from the other end 1-2 of the spring 1 and the spring regulating protrusion 14.
A brush device for a small motor, characterized in that the carbon brush 8 is configured to press the carbon brush 8 in the direction of a commutator.