JPH0336216Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brush device for a rotating electric machine such as a motor or a generator.

Conventionally, brush devices have been assembled into a holder by providing a substantially rectangular hole in a holder made of a conductive strip-shaped spring plate and press-fitting a substantially rectangular head formed on the top surface of the brush into the hole. It is disclosed in Japanese Patent Application Laid-Open No. 55-5025. However, in order to make good contact between the rectangular hole and the side surface of the head of the brush, it is necessary to press fit the brush head with a slight shaving tendency, which tends to damage the fragile brush.

Furthermore, a device is known in which a cut-and-raised piece is provided oppositely to the holder to elastically hold the brush head (publication of Utility Model Publication No. 58-45490), but the cut-and-raised piece swings due to vibration. Doing so may damage the brush.

The purpose of the present invention is to obtain a brush device that eliminates the above-mentioned drawbacks, and as a means for achieving this purpose, deep and wide cut grooves are formed in the center of both short sides of the rectangular hole 2 of the holder 1 made of a spring plate. 3 is formed in the longitudinal direction of the holder 1.

The drawings show an embodiment, and the holder 1 is formed into a plate shape, for example, by a beryllium copper plate having a thickness of 0.15 mm. The deep widening cut groove 3 is a cutout circle 3a shown in the figure.
Although not necessarily true, it is better to make the rear end arc-shaped.
The head 6 of the brush 5 has a cross section approximately equal to that of the hole 2, and its upper corner 6a is rounded to facilitate insertion. 4 is a reinforcing bend of the holder 1.

With the above configuration, when the head 6 is pushed into the rectangular hole 2, the deep widening groove 3 widens, and the long side 1a of the hole 2 tends to widen in the width direction substantially planarly, so that the brush head 6 It can be easily press-fitted without cutting. When the upper surface 5a of the brush body 5 comes into contact with the holder surface and the assembly is completed, the entire length of the long hole surface of the rectangular hole 2 is pressed against the long side surface of the brush head 6 due to the elastic restoration of the cut groove 3. The sturdy assembly
Effects can be obtained through simple structure and assembly work.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the brush device of the present invention, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a horizontal sectional view. 1... Brush holder, 2... Rectangular hole, 3...
Deep wide cutting groove, 5...Brush, 6...Brush head.

Claims (1)

[Claims for Utility Model Registration] A holder 1 made of a conductive band-shaped spring plate is provided with a rectangular hole 2 whose long side is oriented in the longitudinal direction, and a rectangular hole 2 formed on the top surface of the brush 5 is provided in the hole 2. In the brush device in which the brush 5 is assembled to the holder 1 by press-fitting the shaped head 6, a widening cut groove 3 is provided in the rectangular hole 2 to allow the rectangular hole to expand in the width direction at the time of press-fitting. A brush device for a rotating electric machine, characterized in that the brush device is formed in the longitudinal direction of a holder 1 at the center of both short sides.