Electric motor brush assembly

• US 20050191888A1
• Filed: 04/29/2005
• Published: 09/01/2005
• Est. Priority Date: 10/31/2002
• Status: Active Grant

• Current Assignee: Earl M. Ortt, Mark D. Williams, Michael J. Agnes, Robert J. Marcinkowski
• Original Assignee: Earl M. Ortt, Mark D. Williams, Michael J. Agnes, Robert J. Marcinkowski
• Inventors: Williams, Mark D., Ortt, Earl M., Marcinkowski, Robert J., Agnes, Michael J.
• Granted Patent: US 7,135,796 B2
• Time in Patent Office: Days
• US Class Current: 439/189
• CPC Class Codes: H01R 39/385 Means for mechanical fixation of the brush holder
• CPC Class Codes: H01R 39/388 characterised by the material of the brush holder
• CPC Class Codes: H01R 39/41 cartridge type
• CPC Class Codes: H02K 5/148 Slidably supported brushes
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates

Abstract

An electrically conductive brush box is located against the upper surface of a base and has crimping tabs located against an oppositely disposed crimping surface. The base is formed of high temperature resistant plastic. A field case housing has a seat with a retention member adapted to retain the base against the seat. A screw is threaded into the field case housing such that the head presses against a surface of the base member to retain the base member in the seat. The screw member is located in non-contacting relationship with the electrically conductive brush box. A spacer member is adapted to space the portion of the crimping tab against the crimping surface away from the field case housing. The brush box includes a biasing member holder and the crimping tabs are located adjacent the holder.

Claims

1. An electric motor brush assembly, comprising:

an electrically conductive brush box and at least one crimping tab;

a base member having an upper surface and an oppositely disposed crimping surface, the electrically conductive brush box being located against the upper surface and having a portion of the crimping tab located against the oppositely disposed crimping surface;

a field case housing having a seat with a retention member adapted to retain the base against the seat; and

a spacer member adapted to space the portion of the crimping tab against the crimping surface away from the field case housing.

2. An electric motor brush assembly according to claim 1, wherein the base member comprises a high temperature thermoplastic material.

3. An electric motor brush assembly according to claim 1, wherein the base member comprises a thermoset material.

4. An electric motor brush assembly according to claim 1, further comprising a brush retained by the electrically conductive brush box and electrically connected to a power supply, and a biasing member adapted to bias the brush against a commutator.

5. An electric motor brush assembly according to claim 1, wherein the retention member comprises a lip under which a cooperating surface of the base is retained.

6. An electric motor brush assembly according to claim 1, wherein the retention member comprises cooperating snap-fit members on the field case housing and the base adapted to attach the base and the housing together.

7. An electric motor brush assembly according to claim 1, wherein the retention member comprises a screw.

8. An electric motor brush assembly according to claim 1, wherein the spacer member is a surface of the base member which is spaced away from the crimping surface and located against the field case housing.

9. An electric motor brush assembly according to claim 1, wherein the oppositely disposed crimping surface is located within a recess of the base member and wherein the spacer member further comprises a wall of the base member surrounding the recess.

10. An electric motor brush assembly according to claim 1, wherein the at least one crimping tab is a plurality of crimping tabs, and wherein the electrically conductive brush box further comprises oppositely disposed arms, and at least one of the plurality of crimping tabs extends off of each of the oppositely disposed arms.

11. An electric motor brush assembly, comprising:

an electrically conductive brush box, a biasing member holder, and at least one crimping tab adjacent the biasing member holder;

a base member having an upper surface and an oppositely disposed crimping surface, the electrically conductive brush box being located against the upper surface and having a portion of the crimping tab located against the oppositely disposed crimping surface; and

a field case housing adapted to retain the base member.

12. An electric motor brush assembly according to claim 11, wherein the base member comprises a high temperature thermoplastic material.

13. An electric motor brush assembly according to claim 11, wherein the base member comprises a thermoset material.

14. An electric motor brush assembly according to claim 11, wherein the electrically conductive brush box, biasing member holder and at least one crimping tab are made from a single, integral piece.

15. An electric motor brush assembly according to claim 11, further comprising a brush retained by the electrically conductive brush box and electrically connected to a power supply, and a biasing member adapted to bias the brush against a commutator.

16. An electric motor brush assembly according to claim 11, wherein the retention member comprises a lip under which a cooperating surface of the base is retained.

17. An electric motor brush assembly according to claim 11, wherein the retention member further comprises cooperating snap-fit members on the field case housing and the base adapted to attach the base and the housing together.

18. An electric motor brush assembly according to claim 11, wherein the retention member comprises a screw.

19. An electric motor brush assembly according to claim 11, wherein the oppositely disposed crimping surface is located within a recess of the base member.

20. An electric motor brush assembly according to claim 11, wherein the at least one crimping tab is a plurality of crimping tabs, and wherein the electrically conductive brush box further comprises oppositely disposed arms, and at least one of the plurality of crimping tabs extends off of each of the oppositely disposed arms.