SU423216A1 - BRUSH HOLDER - Google Patents

Description

one

The invention relates to the design of the brush holders of electrical machines, providing non-emergency current collection from rotating parts, for example a collector or slip rings.

Known designs are the brush coder} katelep with a lever-spring pressure device and a shock absorber fitted with a hammer and pressure lever.

The proposed brush holder provides, as the brush is worn, an automatic increase in pressure on the brush created by the shock absorber, as a result of which, despite the fact that the pressure generated by the main spring of the pressure device decreases as the brush wears, the total pressure on the brush will be maintained within practically certain limits. constant.

The invention is illustrated in the drawing.

The proposed brush holder includes a holder 1 for accommodating the brush 2; mounted on the holder 1 stops 3; shock absorbers 4; a pressure spring 5, the movable end of which is fixed on the pressure lever b, is rotatable on an axis 7 fixed relative to the housing 8; an additional holder 9, in which part of the shock absorber 4 is located in a compressed state; anchor plugs 10, rotating relative to the axis 11; and springs

2

12, mounted between the large arms of the arms of the anchor forks and the additional yoke 9. The other arms of these arms, provided with anchoring forks at the ends, interact with the coils of the spring shock absorber 4, ensuring their locking in the compressed state.

During operation, the force generated by the spring 5 by means of the lever 6 is transmitted to

0 clip 9 and through the shock absorber 4 to the brush 2. As the brush 2 is worn, the clip 9 together with the anchor forks 10 will be on, and the pressure on the brush slightly drops. When the holder 9 moves, the levers of the anchor arms of the locking unit 10 lie on the stops 3 and will rotate on the axis 11. When the predetermined angle of rotation of the coil portion of the spring shock absorber is reached, the pressure in the compressed state will come out of interaction with the anchor forks, thereby increasing the pressure value created by the shock absorber 4. Increasing the pressure will lead to raising the cage .9 and locking the following turns of the shock absorber spring, 5 in the additional cage, with anchor forks.

This cycle of pressure increase due to the release of the pre-compressed turns of the spring of the shock absorber 4 is repeated several times as the brush is pressed during its operation.

Selecting the dimensions of the arms of the levers, the anchoring forks 10, the distance between the unors 3 and the anchoring forks 10, the rigidity of the springs 5 and 4, respectively, set the necessary limits for the non-stroke pressure on the brush provided in the brush holder.

Subject invention

Brush holder for an electric machine, consisting of a holder for placing a brush and a nam.nogo device, made in the form mounted on the axis of rotation of the clamp lever, spring, movable end

which is fixed on this lever, and a spring shock absorber located between the brush and the movable end of the pressure lever, characterized in that, in order to automatically increase the pressure created by the spring shock absorber, the part of the specified shock absorber is pre-compressed and installed in the additional holder equipped with anchor forks, spring-loaded at one end relative to the additional holder, and the other ends interacting with the turns of the compressed part of the spring shock absorber.