Grounding brush assembly

Patent metadata

Field	Value
Publication number	US-12334782-B2
Application number	US-202218058340-A
Country	US
Kind code	B2
Filing date	Nov 23, 2022
Priority date	Nov 23, 2022
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A device may include a first end, a second end, and a coupler configured to extend through an aperture from a first side to a second side of a motor cover. The coupler includes a head portion, a conduit portion extending from the head portion towards the second end, and a first bore axially extending through the coupler. The device may include a brush holder extending through the first bore. The brush holder includes a cylindrical body, a socket at the first end, and a receptacle at the second end. The device may include a first lock nut including a first threaded bore axially extending through the nut. The device may be configured to enable a grounding brush to contact a motor shaft to provide a current discharge path to ground to reduce an erosion of the motor components including the motor shaft and rolling bearing elements.

First claim

What is claimed is:

1. An apparatus comprising:
a first end;
a second end;
a coupler configured to extend through an aperture from a first side to a second side of a motor cover, the coupler comprising:
a head portion,
a conduit portion extending from the head portion towards the second end, and
a first bore axially extending through the coupler;

a brush holder extending through the first bore, the brush holder comprising:
a cylindrical body,
a socket at the first end, and
a receptacle at the second end; and

a first lock nut comprising:
a first threaded bore axially extending through the nut.

2. The apparatus according to claim 1 , wherein the first bore comprises:
a second threaded bore.

3. The apparatus according to claim 2 , wherein the brush holder further comprises:
a threaded outer surface;
wherein the threaded outer surface of the cylindrical body is configured to threadingly engage the first threaded bore and the second threaded bore.

4. The apparatus according to claim 1 , wherein the conduit portion further comprises a plurality of ridges,
wherein the plurality of ridges is configured to mechanically bind with a surface of the motor cover to retain a position of the coupler.

5. The apparatus according to claim 1 , wherein the coupler further comprises:
a first threaded portion extending from the head portion towards the first end,
a second threaded portion disposed on the conduit portion,
a clamping portion at the first end,
wherein the clamping portion is configured to engage a surface of the brush holder to retain a position of the brush holder, and

wherein the first lock nut is configured to threadingly engage the first threaded portion and apply a clamping force onto the clamping portion to retain the position of the brush holder relative to the coupler.

6. The apparatus according to claim 5 , further comprising:
a second lock nut comprising:
a third threaded bore;

wherein the second lock nut is configured to threadingly engage the second threaded portion at the second side of the motor cover to retain a position of the coupler relative to the motor cover.

7. The apparatus according to claim 1 , further comprising:
a grounding brush, and
a spring element,
wherein the spring element is configured to apply a spring force onto the grounding brush and the receptacle,

wherein the spring force enables the grounding brush to contact a surface of a motor shaft.

8. The apparatus according to claim 1 , wherein the coupler comprises a press-fit nut.

9. The apparatus according to claim 1 , wherein the first lock nut is configured to retain an axial position of the brush holder relative to the coupler.

10. A device comprising:
a first end;
a second end;
a press-fit nut configured to extend through an aperture from a first side of a motor cover to a second side of the motor cover, the press-fit nut comprising:
a head portion,
a conduit portion configured to extend into the aperture towards the second end, and
a first bore extending from the first end to the second end,
wherein the conduit portion is further configured to engage a surface of the motor cover to retain a position of the press-fit nut in the aperture;

a brush holder configured to extend through the first bore, the brush holder comprising:
a cylindrical body,
a socket at the first end, and
a receptacle at the second end;

a first lock nut comprising:
a first threaded bore extending through the first lock nut;

a grounding brush; and
a spring element,
wherein the spring element is configured to apply a spring force onto the grounding brush and the receptacle,
wherein the spring force enables the grounding brush to contact the surface of a motor shaft.

11. The device according to claim 10 , wherein the first bore comprises:
a second threaded bore.

12. The device according to claim 11 , wherein the brush holder further comprises:
a threaded outer surface;
wherein the threaded outer surface of the brush holder is configured to threadingly engage the first threaded bore and the second threaded bore.

13. The device according to claim 10 , wherein the press-fit nut further comprises:
a first threaded portion between the head portion and the first end,
a second threaded portion between the conduit portion and the second end, and
a clamping portion at the first end,
wherein the clamping portion is configured to engage a surface of the brush holder to retain a position of the brush holder,

wherein the first lock nut is configured to threadingly engage the first threaded portion at the first end and to apply a clamping force onto the clamping portion to retain the position of the brush holder relative to the press-fit nut.

14. The device according to claim 13 , further comprising:
a second lock nut comprising:
a third threaded bore;

wherein the second lock nut is configured to threadingly engage the second threaded portion at the second side of the motor cover to retain the position of the press-fit nut.

15. The device according to claim 10 , wherein the conduit portion further comprises a plurality of ridges traversing an outer circumference of the conduit portion,
wherein the plurality of ridges is configured to mechanically bind with the surface of the motor cover to retain the position of the press-fit nut.

16. The device according to claim 10 , wherein the first lock nut is configured to retain an axial position of the brush holder relative to the press-fit nut.

17. An assembly comprising:
a first end;
a second end;
a press-fit nut configured to extend through an aperture from a first side to a second side of a motor cover, the press-fit nut comprising:
a head portion adjacent the first end,
a conduit portion extending from the head portion towards the second end, and
a first bore axially extending through the press-fit nut;

a brush holder configured to extend through the first bore, the brush holder comprising:
a cylindrical body,
a socket at the first end, and
a receptacle at the second end;

a first lock nut comprising:
a first threaded bore axially extending through the first lock nut,
wherein the first lock nut is configured to retain an axial position of the brush holder relative to the press-fit nut.

18. The assembly according to claim 17 , further comprising:
a grounding brush,
a spring element,
wherein the spring element is configured to apply a spring force onto the grounding brush and the receptacle,
wherein the spring force enables the grounding brush to contact a surface of a motor shaft.

19. The assembly according to claim 17 , wherein the first bore comprises:
a second threaded bore.

20. The assembly according to claim 19 , wherein the brush holder further comprises:
a threaded outer surface,
wherein the threaded outer surface of the brush holder is configured to threadingly engage the first threaded bore and the second threaded bore.

Assignees

• Abb Schweiz Ag

Inventors

• Perigo Elio
• Rakuff Stefan
• Mikail Rajib
• Medlin Graham
• Scott Christopher

Classifications

• H01R39/385

  Means for mechanical fixation of the brush holder · CPC title

• H01R39/39

  wherein the brush is fixedly mounted in the holder · CPC title

• H01R39/381

  characterised by the application of pressure to brush · CPC title

• H02K5/148

  Slidably supported brushes · CPC title

• H02K11/40 Primary

  Structural association with grounding devices · CPC title