JPS6031193Y2 - electric brush - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an electric brush used in an electric motor or the like.

Figures 1 and 2 are front views showing conventional military leakers, in which 1 is a lead wire, 2 is an electric brush, 3 is a commutator, 4 is a sloped part of the electric brush 2, and 5 is an electric brush 2. The flat part 8 is the third contact part between the electric brush 2 and the commutator.

In FIG. 1, the contact state between the electric brush 2 and the commutator 3 is such that the end of the electric brush 2 is inclined and they are in contact at the tip of the slope, so the area of the contact portion 8 is small, and therefore the initial output The quality is poor, chipping is likely to occur, and uneven wear of the commutator 3 and electric brush 2 occurs.

Furthermore, in Fig. 2, the apparent contact state between the electric brush 2 and commutator 3 is considered to be good, but the true contact state is that they are not in complete contact but are in contact only partially and are sliding. There were drawbacks such as an increase in the sliding noise of the electric brush at the initial stage of use.

The object of the present invention is to provide an electric brush that does not have the above-mentioned drawbacks.

The present invention relates to an electric brush in which a sliding surface in contact with a commutator is provided with a plurality of tapered concavo-convex portions parallel to the rotational direction of the commutator in the axial direction.

The present invention will be explained below with reference to the drawings.

3 and 4 are front views showing an electric brush according to an embodiment of the present invention.

In FIG. 3, reference numeral 6 indicates a tapered sawtooth-shaped uneven portion provided on the sliding surface of the electric brush 2, and in FIG. 4, reference numeral 7 indicates a tapered wavy-shaped uneven portion provided on the sliding surface of the electric brush 2.

The purpose of the present invention can be fared away by bringing the thin sawtooth-like unevenness 6 and the thin wave-like unevenness 7 into contact with the commutator 3 and making the sliding surfaces of the electric brush 2 and the commutator 3 a large number of points. I was trying to relate to it.

In the present invention, tapering may mean that the tip is pointed like a normal wedge (FIG. 3), or it may have an arcuate tip (FIG. 4).

Note that these narrow uneven parts may be machined from time to time to correct the setting, or they may be used until they are completely worn out.
Processing shall be performed depending on the contact state of the

(Therefore, if contact failure does not occur, the electric brush 2 can be used up to its wear limit.

) Next, an embodiment of the present invention will be described.

A comparative test was conducted between the conventional method shown in FIGS. 1 and 2 and the present invention shown in FIG. 3, and the results are shown in Table 1.

As a result of the above, by configuring the present invention in this way, the sliding noise of the electric brush is low and the initial output does not decrease, and uneven wear of the commutator and chipping of the electric brush are also eliminated.

[Brief explanation of drawings]

Figures 1 and 2 are front views of a conventional electric brush, and Figure 3 is a front view of a conventional electric brush.
FIG. 4 is a front view showing an electric brush according to an embodiment of the present invention. Explanation of symbols 1...Lead wire, 2...Electric brush, 3...Commutator 4...Slope portion, 5
...Flat part, 6... Tapered serrated uneven part, 7... Tapered wavy uneven part, 8.
...Contact part.

Claims (1)

[Scope of utility model registration request] An electric brush comprising a plurality of tapered concave and convex portions parallel to the rotational direction of the commutator in the axial direction on the sliding surface that comes into contact with the commutator.