Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1988-03-01
1991-12-03
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 43, 310 45, 310 91, H02K 1300
Patent
active
050702700
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a brush device for use in a rotary machine such as, for example, a starter motor.
FIGS. 1 and 2 are a plan view and a sectional view of a principal portion, respectively, showing at conventional brush device. In FIGS. 1 and 2, the numeral 1 denotes a commutator of a rotary machine; numerals 2a and 2b denote minus-side holding frames; numerals 3a and 3b denote plus-side holding frames; numerals 4a and 4b denote synthetic resin plates which are fixed to the plus-side holding frames 3a and 3b at caulking and fixing portions 5a and 5b, respectively; and numeral 6 denotes a base plate made of iron, which is fixed by caulking to the minus-side holding frames 2a and 2b directly and also to the plus-side holding frames 3a and 3b through the synthetic resin plates 4a and 4b in an insulated relation. Numerals 7a and 7b denote plus-side brushes received in a receiving space formed by the plus-side holding frames 3a, 3b and the synthetic resin plates 4a, 4b. Numerals 8a and 8b denote minus-side brushes received in a receiving space formed by the minus-side holding frames 2a, 2b and the base plate 6. On portions of brushes 7a, 7b, 8a, and 8b are fixed lead wires 9a, 9b, 10a, and 10b. The lead wires 9a and 9b, which are on the minus side, are connected electrically to the base plate 6, while the lead wires 10a and 10b, which are on the plus side, are connected electrically to a power unit through a connector 11. Further, numeral 12 denotes a brush spring for urging the brushes 7a, 7b, 8a and 8b to the commutator 1.
In the conventional brush device of the above construction, however, when the brushes 7a, 7b, 8a, and 8b are worn out by sliding contact with the commutator 1 and that wear exceeds a predetermined amount, the lead wires 9a, 9b, 10a, and 10b come into abutment with the holding frames 2a, 2b, 3a, and 3b, as shown in FIG. 2, resulting in the brushes 7a, 7b, 8a, and 8b no longer being employable although a portion of their rated service life still remains.
SUMMARY OF THE INVENTION
The present invention has been effected to solve the above-mentioned problem of the prior art. It is the object thereof to provide a brush device having a longer employable period and improved durability.
In the brush device according to the present invention, a brush and a spring for urging the brush to a commutator are enclosed in a brush holding frame, and in order to draw out a lead wire connected to the brush, an end portion in a commutator sliding-contact direction of an opening formed in the brush holding frame is inclined inwards of the receiving portion of the brush holding frame and in the commutator sliding-contact direction. This construction is advantageous in that the lead wire does not obstruct the advance of the brush when worn out, whereby the brush can be used effectively and both economy and durability can be attained.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a conventional brush device;
FIG. 2 is a sectional view of a principal portion thereof;
FIG. 3 is a plan view of a brush device according to an embodiment of the present invention; and
FIG. 4 is a sectional view of a principal portion thereof.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
A brush device embodying the present invention will now be described with reference to the drawings. FIGS. 3 and 4 are a plan view and a sectional view of a principal portion, respectively, showing a brush device according to an embodiment of the invention. In FIGS. 3 and 4, numerals 13a and 13b denote minus and plus brushes, respectively, and numeral 14 denotes a brush spring for urging the brushes 13a and 13b to a commutator 1. The brushes 13a, 13b and brush spring 14 are received in a receiving portion 16 of a brush holding frame 15 integrally molded using a thermosetting synthetic resin. Numeral 17 denotes an opening sufficiently adequate for drawing out a lead wire 18a or 18b, and the opening is formed in a side part of the receiving portion 16 of the brush holding frame 15. An end portion o
REFERENCES:
patent: 4166968 (1979-09-01), Prittie
patent: 4355253 (1982-10-01), Vollbrecht
patent: 4366404 (1982-12-01), Ziegler
patent: 4754184 (1988-06-01), Morikane et al.
Mitsubishi Denki K.K.
Skudy R.
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