JPH05191952A - Dynamo-electric machine brush mounting device - Google Patents

Abstract

PURPOSE:To provide such a highly reliable dynamo-electric machine that the function of the dynamo-electric machine does not drop. CONSTITUTION:The end 16 on the side where a brush spring 14 in cylindrical spiral hits against a brush has the constitution of being bent inward of itself, whereby the end 16 of the brush spring 14 ceases to bite and catch in the inwall of a brush holder 15. Accordingly, since a brush 13 is always pressed for the end 13a by the brush spring 14, the contact resistance between the brush 13 and a slip ring 12 becomes large, so problems vanishes such as that the power supply to the rotary part decreases, or that, in the worst case, the brush 13 and the slip ring 12 separate from each other and a current ceases to flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine brush mounting device.

[0002]

2. Description of the Related Art In recent years, rotating electric machines have been widely used in various devices for industrial use, domestic use, automobiles and the like. Among rotating electric machines, to supply power to a rotating part through a plurality of brushes and a plurality of slip rings or commutators of the same number as the brushes, in order to apply pressure to a surface of the brushes that contacts the slip rings or commutator, A cylindrical spiral brush spring is provided on the surface opposite to the surface contacting the commutator, and the brush and the brush spring are preferably housed in a brush holder so that they can be easily moved. Has been adopted.

As shown in FIGS. 2 and 3, a slip ring 2 attached to an end of a rotary shaft 1, a brush 3 for supplying electric power to the slip ring 2, and a slip ring 2 of the brush 3.
A cylindrical spiral brush spring 4 provided on the opposite surface of the brush 3 to apply pressure to the surface that contacts the brush 3, and a brush holder 5 housed so that the brush 3 and the brush spring 4 can move easily. It is composed of a pigtail (not shown) that supplies electric power to the brush. In FIG. 4, the brush spring 4 is formed in a cylindrical spiral shape, and its end 6 is cut in the middle of the spiral.

[0004]

However, in the above-mentioned conventional brush mounting device, the material of the brush spring 4 is generally spring steel and the hardness is relatively large, whereas the material of the brush holder 5 is generally resin or Since the hardness is relatively low with brass or the like, there is a possibility that the end portion 6 of the brush spring 4 shown in FIG. 3 may bite and be caught by the inner wall of the brush holder 5 during operation of the rotating electric machine. In such a case, the end portion 3a of the brush 3 cannot be pushed by the brush spring 4, so that the contact resistance between the brush 3 and the slip ring 2 increases and the amount of power supply to the rotating portion decreases.
In the worst case, the brush 3 and the slip ring 2 are separated from each other, so that no current flows. As a result, there is a problem that the function of the rotary electric machine is deteriorated or lost.

The present invention solves the above-mentioned conventional problems, and the function of the rotating electric machine does not deteriorate or disappear.
An object of the present invention is to provide a highly reliable rotating electric machine brush mounting device.

[0006]

In order to achieve this object, a rotating electric machine brush mounting device of the present invention includes a plurality of brushes and a plurality of slip rings or commutators of the same number as the brushes in the rotating portion of the rotating electric machine. A cylindrical spiral brush spring is provided on the surface opposite to the surface contacting the commutator in order to supply electric power and apply pressure to the surface contacting the slip ring or the commutator of the brush. The brush and the brush spring are housed in a brush holder so that they can be easily moved, and the spiral end of at least the brush-contacting side of the brush spring is folded to the inner diameter side of the cylindrical spiral brush spring. have.

[0007]

With this structure, the end of the brush spring does not bite and get caught on the inner wall of the brush holder during operation of the rotating electric machine, so that the end of the brush is constantly pushed by the brush spring. The contact resistance between the brush and the slip ring is increased to reduce the amount of electric power supplied to the rotating portion, and in the worst case, the brush and the slip ring are separated from each other and the current does not stop flowing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A brush mounting device for a rotary electric machine according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a brush 13 for supplying electric power to the slip ring 12, and a slip ring 1 of the brush 13
2, a cylindrical spiral brush spring 14 provided on the opposite surface of the brush 13 for applying pressure to the surface contacting the brush 2, and a brush holder 15 housed so that the brush 13 and the brush spring 14 can be easily moved. And the end portion 16 of the cylindrical spiral brush spring 14 is
Is folded to the inner diameter side.

The operation of the rotary electric machine brush mounting device constructed as described above will be described below. Since the end portion 16 of the cylindrical spiral brush spring is folded toward the inner diameter side of the cylindrical spiral brush spring 14, the end portion 16 of the brush spring bites into the inner wall of the brush holder during operation of the rotating electric machine,
It will not get caught. Therefore, since the end portion 13a of the brush 13 is constantly pushed by the brush spring 14, the contact resistance between the brush 13 and the slip ring 12 is increased to reduce the power supply amount to the rotating portion, or in the worst case, the brush 13 There is no problem that the slip ring 12 is separated from the slip ring 13 and the current stops flowing.
As a result, it is possible to provide a highly reliable rotating electric machine brush attaching device in which the function of the rotating electric machine does not deteriorate or disappear.

The end portion 1 of the cylindrical spiral brush spring is
The purpose of folding 6 to the inner diameter side is to prevent the end portion 16 of the cylindrical spiral brush spring from biting into the inner wall of the brush holder 15 and getting caught. Only the side that contacts the brush 13 may be folded to the inner diameter side.

[0012]

As is apparent from the above description of the embodiments, according to the rotary electric machine brush mounting apparatus of the present invention, a plurality of brushes and a plurality of slip rings or commutators of the same number as the brushes are provided in the rotating portion of the rotary electric machine. A cylindrical spiral brush spring is provided on the surface opposite to the surface contacting the commutator in order to supply power via the brush and to apply pressure to the surface contacting the slip ring or commutator of the brush. The brush spring is housed in a brush holder so that it can be easily moved, and has a configuration in which at least the spiral end of the brush spring on the side that contacts the brush is folded to the inner diameter side of the cylindrical spiral brush spring. As a result, it is possible to provide a highly reliable rotating electric machine brush attaching device in which the function of the rotating electric machine does not deteriorate or disappear.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing the concept of the configuration of a brush mounting device for a rotary electric machine according to an embodiment of the present invention. FIG.

FIG. 2 is a vertical cross-sectional view showing the configuration of a conventional and commonly used automobile generator.

FIG. 3 is a cross-sectional view showing the concept of the configuration of the main part near the brush attachment device of FIG.

FIG. 4 is an enlarged perspective view showing an end portion of the brush spring of FIG.

[Explanation of symbols]

 12 Slip ring 13 Brush 14 Brush spring 15 Brush holder 16 End of brush spring

Claims (1)

[Claims] 1. A rotating electric machine having a rotating portion provided with a plurality of slip rings or a commutator, wherein a brush contacting the commutator or the slip ring is provided with a cylindrical spiral brush spring, and the brush and the brush spring are easily moved. A brush attachment device for a rotating electric machine housed in a brush holder so that the brush attachment device includes a brush spring in which at least a spiral end on the side abutting the brush is folded to the inner diameter side. .