JPS5845496Y2 - brush retainer - Google Patents

Description

[Detailed explanation of the idea] In this invention, the brush is supported by a support pin.

The present invention relates to an improvement of a brush holder in which pressure is applied to an extruded brush by twisting the support pin into a coil.

For example, in a disc-shaped commutator, it is necessary for the brush to smoothly follow the commutator surface.

This is especially important in a counter-rotating rotating electric machine in which the brush holder side also rotates in the opposite force direction to the commutator.

A conventional brush holder of this type is shown in plan and side views in FIGS. 1 and 2.

1 is a disc-shaped commutator, 2 is a brush, and 3 is a cage frame.
It is attached to the supporting body side, such as a bracket part (not shown).

Reference numeral 4 denotes a support pin that penetrates and supports the brush 2, and has guide grooves 4a provided at both ends.

Reference numeral 5 designates a pair of holding arms whose one end is fitted into a support pin, and whose other end is fitted into both ends of a connecting pin 6 passing through the retainer frame 3, so that they are rotatably connected.

Reference numeral I designates a spring support pin fixed to the retainer frame 3, and reference numeral 8 designates a torsion coil spring fitted across both sides of the spring support pin, with both extended ends 8a guided in the guide groove 4a.

Arrow W indicates the pressing force of the torsion coil spring 8, and arrows M and N indicate the direction of movement that occurs in the brush 2 due to the bumps and vibrations on the commutator 1 surface.

The brush 2 receives a pressing force W through the support pin 4 by the torsion coil spring 8, and presses the commutator 1 surface.

When the commutator 1 rotates, the brush 2 moves in the direction of arrow M due to the fall of the commutator surface and the protrusions between the commutator pieces.

Slight movement in the N direction.

Accordingly, as shown in FIGS. 3 and 4, the contact point P of the end 8a of the torsion coil spring 8 moves linearly back and forth in the directions of arrows A and B with respect to the guide groove 4a of the support pin 4. It turns out.

In the above conventional brush retainer, one point of the guide groove 4a is in contact with the end portion 8a, and due to the contact pressure caused by sliding, local fatigue occurs, causing wear and dents, and the gap between the two ends. This obstructs the oscillating motion, impairs the ability of the torsion coil spring 8 to follow the vibrations of the brush 2, and eventually leads to deterioration in rectification.

This idea involves rotatably fitting a pair of guide rings to both ends of the support pin of the brush, and inserting the end of a twist coil spring into the guide groove on the outer circumference of the guide ring to press the vibration of the brush. The object of the present invention is to provide a brush holder with excellent followability by reciprocally rotating and moving the contact between the two sides using a guide ring.

FIGS. 5 and 6 are a plan view and a side view of a brush holder according to an embodiment of the present invention, and are 1-3 degrees 5-8, 8a
is the same as the conventional device described above.

1 at both ends of the support pin 10 that penetrates and supports the brush 2.
A pair of guide wheels 11 are rotatably fitted.

In order to prevent the support pin 10 from being removed, snap rings (not shown) are fitted at both ends.

As shown in FIGS. 7 and 8, the guide ring 11 is provided with a guide groove 11a on its outer circumference, and has a torsion coil spring 8.
The end 8a of is inserted and pressed.

A solid lubricant 12 is placed in the inner diameter portion of the guide ring 11 to further smooth rotation.

thus. The contact point P between the end portion 8a and the guide groove 11a can be smoothly moved in the directions of arrows C and D by the follow-up rotation of the guide wheel 11.

In the brush holder according to the above embodiment, the contact point P makes reciprocating contact in the directions of arrows C and D with respect to the movement of the brush 2.

Furthermore, even if the end portion 8a or the guide groove 11a is worn out or dented, the torsion coil spring 8 always maintains a substantially constant pressing force against the support pin 10 due to the smooth follow-up rotation of the guide ring 11. can be added.

As described above, according to this invention, the pressure of the end of the torsion coil spring is applied to the support pin of the brush via the opposing guide ring, and the contact between the end and the guide groove of the guide ring is transferred. This makes it possible to apply almost constant pressure to the brush as it moves, improving rectification performance.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and a side view of a conventional brush holder, and Figures 3 and 4 are enlargements showing the state of contact between the end of the torsion coil spring and the guide groove of the support pin in Figure 1. 5 and 6 are a plan view and a side view of a brush holder according to an embodiment of the invention, and FIGS. 7 and 8 are
The figures are an enlarged plan view and a side view showing the state of contact between the end of the torsion coil spring and the guide of the support pin in FIG. 5. 2... Brush, 3... Sustaining device frame body, 5... Sustaining arm,
8... Torsion coil spring, 8a... End, 10...
・Support pin, 11... Guide ring, 11a... Guide groove. The same buttons and the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A support pin that penetrates and supports the brush, a pair of guide rings rotatably fitted on both ends of the support pin, and a guide ring is provided on the outer circumference, and a retainer frame attached to the support side. a pair of holding arms, one end of which is fitted into each end of the support pin, rotatably receives the guide ring from both sides, and is rotatably connected to the retainer frame; A brush holder comprising a torsion coil spring that is held on a body side and has both extended ends inserted into guide grooves of each of the guide rings and presses the brush via the support pin.