Brush holding device for rotating electrical machines

• US 4,673,838 A
• Filed: 10/02/1985
• Issued: 06/16/1987
• Est. Priority Date: 10/03/1984
• Status: Expired due to Term

• Current Assignee: Nippondenso Company Limited 1-1 Showa-Cho Kariya-Shi Aichi Japan
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Yoshikawa, Naoki, Hamaguchi, Masayuki, Mori, Masanori, Wakahara, Yasuyuki, Takagi, Yoshito, Hamano, Satoru
• Primary Examiner(s): Skudy, R.
• Application Number:
  US06/783,073
• Time in Patent Office: 622 Days
• Field of Search: 310/43, 310/45, 310/238, 310/239, 310/89, 310/41, 310/241, 310/242, 310/245, 310/246, 310/247
• US Class Current: 310/239
• CPC Class Codes: H01R 39/38 Brush holders
• CPC Class Codes: H02K 5/148 Slidably supported brushes

Abstract

A brush holding device of an "easy-to-assemble" type disposed between a yoke and an end frame of a motor. The device has a brush holder formed in one body from an electrically insulating material to include an annular-type field winding fixing frame, a brush holding stay having a plurality of brush chambers thereon, each of the brush chambers having at least an opening on the side of the end frame, integral connecting portions annularly connecting the spaced brush chambers therebetween, an insulating plate member having relatively rigid body portions to cover the openings of the brush chambers and relatively flexible portions connecting the body portions therebetween, and means for fixing the insulation to the brush holders by deforming the flexible portions of the insulator toward the brush holders. The aforementioned annular fixing frame has a plurality of flanges radially outwardly extending from the outer periphery thereof by which the annular frame is circumferentially axially aligned with the yoke. Consequently, the brush holding device is able to be rigidly held between the yoke and the end frame without using a bolt while establishing a good alignment of the device in the circumferential and the axial direction.

Claims

1. A brush holding device for holding brushes in sliding contact with a commutator of a motor, and disposed between a yoke and an end frame of said motor, comprising:

an annular fixing frame formed as an integral body from an electrically insulating material to have a plurality of flanges radially outwardly extending from an outer periphery thereof and depressions provided at the outer periphery thereof;

a brush holding stay held on said annular fixing frame and formed as an integral body from an electrically insulating material to have a plurality of spaced apart brush holders, each holder having a first opening provided in an inner end thereof to which said commutator faces and a second opening provided in a side surface thereof to which said end frame faces, and connecting portions connecting said brush holders;

an insulating plate disposed between said brush holding stay and an inner wall of said end frame and integrally formed from an electrically insulating material to have a plurality of relatively rigid portions and a plurality of relatively flexible portions bridging said relatively rigid portions therebetween;

said relatively rigid portions being disposed so that they blockade said second openings of said brush holders;

projection means for pushing said relatively flexible portions of said insulating plate toward said brush holding stay, so that said insulating plate is rigidly held on said brush holding stay by resilience of said relatively flexible portions thereof;

a plurality of brushes reciprocally received in said brush holders respectively;

spring means for urging said brushes into sliding contact with said commutator; and

pig tails electrically connected to said brushes

said annular fixing frame having a plurality of flanges radially, outwardly extending from the outer periphery thereof by which said annular fixing frame is substantially held at an edge of said yoke and is substantially aligned with said yoke;

each of said brush holders having walls defining a chamber to receive one of said brushes therein, at least one of said walls further having a depression for passing one of said pig tails therethrough.

2. A brush holding device as claimed in claim 1 wherein each of said brush holders has a portion from which a pair of parallel tongues extend so that said brush holding stay can be substantially aligned with said annular fixing frame in the circumferential direction by inserting at least respective ones of said parallelly of extending tongues into the respective depressions of said annular fixing frame.

3. A brush holding device as claimed in claim 2 wherein at least one of said pair of tongues further has at its forward end a projection whereby hooking the respective depression of said annular fixing frame so that said brush holding stay is substantially aligned with said annular frame in the circumferential and axial directions.

4. A brush holding device as claimed in claim 1 wherein said projection means comprises a plurality of spaced projections inwardly projecting from said inner wall of said end frame, said projections corresponding to said relatively flexible portions of said insulating plate, so that said brush holding stay and said insulating plate are rigidly held between said yoke and said end frame by resilience of said relatively flexible portions of said insulating plate.

5. A brush holding device for holding brushes in sliding contact with a commutator of a motor, and disposed between a yoke and an end frame of said motor, comprising:

a brush holding member formed an integral body from an electrically insulating material to have a plurality of spaced apart brush holders, each brush holder having a first opening provided in an inner end thereof to which said commutator faces and a second opening provided in a side surface thereof to which said end frame faces, an annular frame portion supporting said spaced apart brush holders thereon, said annular frame portion having a plurality of flanges radially outwardly extending from an outer periphery thereof, and wall portions connecting said inner ends of said brush holders therebetween;

a corresponding plurality of brushes reciprocally received in said brush holders respectively;

a corresponding plurality of spring means for urging one end of said brushes into sliding contact with said commutator;

a corresponding plurality of pig tails electriclly connected to said brushes;

an insulating plate disposed between said brush holding member and an inner wall of said end frame and formed as an integral body from an electrically insulating material to have relatively rigid portions and relatively flexible portions bridging said relatively rigid portions therebetween;

projection means for pushing said relatively flexible portions of said insulating plate toward said brush holding member;

each of said brush holders having walls defining a chamber to receive one of said brushes, at least one of said walls further having a depression for passing one of said pig tails therethrough;

said rigid portions of said insulating plate being correspondingly arranged for blockading at least said second openings of said brush holders;

said brush holding member and said insulating plate being substantially held between said yoke and said end frame by resilience of said relatively flexible portions of said insulating plate.

6. A brush holding device for holding brushes in sliding contact with a commutator of a motor, and disposed between a yoke and an end frame of said motor, comprising;

a brush holding stay formed as an integral body from an electrically insulating material to have a plurality of spaced apart brush holders, each holder having a first opening provided in an inner end thereof to which said commutator faces and a second opening provided in a side surface thereof to which said end frame faces, and connecting portions connecting said brush holders;

an insulating plate disposed between said brush holding stay and said end frame and formed as an integral body from an electrically insulating material to have a plurality of relatively rigid portions and a plurality of relatively flexible portions bridging said relatively rigid porions therebetween;

said relatively rigid portions being disposed so that they blockade said second openings of said brush holders; and

projection means for pushing said relatively flexible portions of said insulating plate toward said brush holding stay, so that said insulating plate is rigidly held on said brush holding stay by resilience of said relatively flexible portions thereof.