JPH0142471B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding brush, and particularly to an improvement in a comb-like sliding brush.

In the comb-shaped sliding brush 1 shown in FIG. 1, each brush band material 2 is formed by punching out a band-shaped material with a die, so due to wear of the die or uneven mold processing technology, etc. Each brush strip material 2 may have a step difference or may be tilted diagonally to either the left or right. If such a sliding brush 1 is attached to a spring base material and used as a sliding contact, the contact with the commutator becomes unstable, causing uneven wear, increasing the amount of wear, and shortening the life of the commutator. This causes uneven rotation.

The present invention has been made in order to solve this problem, and aims to provide a sliding brush in which the brush strip has no steps and is not tilted from side to side.

In the sliding brush of the present invention, as shown in FIGS. 2 and 3, in a comb-shaped sliding brush 1', both left and right ends of each brush strip 2' are curved in the same direction with equal curvature. It is characterized by the formation of reinforcing ribs 2a.

In this way, each brush strip material 2 whose right and left end portions are curved in the same direction with equal curvature to form reinforcing ribs 2a is cut by the adjacent brush strip materials due to the formation of reinforcing ribs 2a during the press cutting process. 2' has no level difference in the vertical direction, and each brush strip material 2' is not tilted diagonally to either the left or right, and is entirely horizontal. Therefore, when the sliding brush 1' having such a brush band material 2' is attached to a spring base material and used as a sliding contact, the contact with the commutator becomes stable and uneven wear is eliminated.
The commutator is worn out uniformly over the entire surface, reducing the amount of wear and the life is extended, and the rotation of the commutator is stable because there is no irregularity in rotation.

Next, in order to clarify the effects of the sliding brush of the present invention, specific examples and conventional examples thereof will be described.

〔Example〕

Pd35−Ag30 with width 1.6mm, length 10mm, thickness 0.1mm
- One half of the strip-shaped material made of Pt10-Au10-Cu14-Zn1 alloy is cut using a press, and the second and third
As shown in the figure, three brush strips 2' with a length of 6 mm and a width of 0.4 mm are formed with an interval of 0.2 mm, and at the same time, the left and right ends of each brush strip 2' have a radius of curvature of 0.1 mm.
Reinforcement ribs 2 with a height of 0.2 mm are curved in the same direction at
A was formed to obtain a sliding brush 1'.

[Conventional example]

One half of a strip-shaped material made of the same alloy as the example with a width of 1.7 mm, a length of 10 mm, and a thickness of 0.1 mm was punched out using a die to form three strips of 6 mm in length and 0.4 mm in width as shown in Figure 1. Brush strips 2 are formed at intervals of 0.25 mm to form a sliding brush 1.
I got it.

However, each of the sliding brushes of these embodiments and the conventional example
When quality was inspected for 100 brushes, there were 10 defective products in which the brush strip material 2 was tilted from side to side and had a step difference in the conventional sliding brush 1, whereas the sliding brush in the example There were no such defects in brush 1'.

Although the sliding brush 1' in the above embodiment is made of solid material, it may also be made of a composite material in which a required material is laminated only on the contact surface.

As detailed above, in the sliding brush of the present invention, the left and right ends of each brush strip are curved in the same direction with equal curvature to form reinforcing ribs, so there is no step in each brush strip. , it is horizontal with no left or right inclination, so when it is attached to a spring base and used as a sliding contact, the contact with the commutator is stable, and the wear is uniform over the entire surface without bias, reducing the amount of wear. This has the excellent effect of increasing the life of the commutator and eliminating irregularities in the rotation of the commutator, making it more stable.

[Brief explanation of drawings]

Figure 1 is a plan view of a conventional comb-shaped sliding brush.
FIG. 2 is a plan view of the comb-shaped sliding brush of the present invention;
FIG. 3 is an enlarged sectional view taken along the line A--A in FIG. 2. 1'...Sliding brush of the present invention, 2'...Brush band material, 2a...Reinforcing rib.

Claims (1)

[Claims] 1. A comb-shaped sliding brush, characterized in that both left and right ends of each brush strip are curved with equal curvature in the same direction to form reinforcing ribs.