Grounding bushing and a method of using the grounding bushing to provide a ground connection between a component and a vehicle body rail

Patent metadata

Field	Value
Publication number	US-9768531-B1
Application number	US-201615192048-A
Country	US
Kind code	B1
Filing date	Jun 24, 2016
Priority date	Jun 24, 2016
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A method according to the present disclosure provides a ground connection between a first component and a vehicle body rail through a coating disposed on the vehicle body rail. The method includes inserting a grounding bushing into an aperture in a second component, positioning the second component between the first component and the vehicle body rail, placing the grounding bushing in contact with the first component, and inserting a fastener through the first component, through the grounding bushing, and into the vehicle body rail. The method further includes tightening the fastener to clamp the first component and the grounding bushing between a head of the fastener and the vehicle body rail and thereby cause the grounding bushing to pierce through the coating disposed on the vehicle body rail to provide the ground connection between the first component and the vehicle body rail.

First claim

What is claimed is:

1. A ground connection between a first component and a vehicle body rail through a coating disposed on the vehicle body rail, the ground connection comprising:
the first component;
the vehicle body rail;
a second component disposed between the first component and the vehicle body rail;
a fastener that secures the first component to the vehicle body rail; and
a grounding bushing including:
an annular body inserted into an aperture in the second component, the annular body having a first surface facing the vehicle body rail and a second surface opposite of the first surface and contacting the first component, the annular body defining an aperture that receives the fastener; and
a piercing body projecting from the first surface of the annular body and piercing through the coating disposed on the vehicle body rail to provide the ground connection between the first component and the vehicle body rail when the fastener is tightened to secure the first component to the vehicle body rail.

2. The ground connection of claim 1 wherein the annular body is secured within the aperture in the second component using a press fit.

3. The ground connection of claim 1 wherein the first component is formed of a non-conductive material.

4. The ground connection of claim 1 wherein the vehicle body rail is formed of a first material and the grounding bushing is formed of a second material that is harder than the first material.

5. The ground connection of claim 1 wherein the first component is a tray of a battery pack and the second component is a cover of the battery pack.

6. The ground connection of claim 1 wherein the coating includes at least one of an electro paint operation (ELPO) coating, a paint coating, and an oxidation coating.

7. A grounding bushing for providing a ground connection between a first component and a vehicle body rail through a coating disposed on the vehicle body rail, the grounding bushing comprising:
an annular body configured to be inserted into an aperture in a second component disposed between the first component and the vehicle body rail, the annular body having a first surface configured to face the vehicle body rail and a second surface opposite of the first surface and configured to contact the first component, the annular body defining an aperture configured to receive a fastener for securing the first component to the vehicle body rail;
a piercing body projecting from the first surface of the annular body and configured to pierce through the coating disposed on the vehicle body rail to provide the ground connection between the first component and the vehicle body rail when the fastener is tightened to secure the first component to the vehicle body rail; and
an annular flange projecting radially outward from the annular body, the second component defining a shoulder against which the annular flange abuts when the annular body is inserted into the aperture in the second component.

8. The grounding bushing of claim 7 wherein the piercing body includes a ring projecting from the first surface of the annular body and having a sharp distal end.

9. The grounding bushing of claim 7 wherein the piercing body includes a plurality of teeth disposed on the first surface of the annular body.

10. The grounding bushing of claim 7 wherein when the annular flange abuts against the shoulder of the second component, the second surface of the annular body is one of flush with an adjacent surface of the second component or protrudes relative to the adjacent surface.

11. A method for providing a ground connection between a first component and a vehicle body rail through a coating disposed on the vehicle body rail, the method comprising:
inserting a grounding bushing into an aperture in a second component;
positioning the second component between the first component and the vehicle body rail;
placing the grounding bushing in contact with the first component;
inserting a fastener through the first component, through the grounding bushing, and into the vehicle body rail; and
tightening the fastener to clamp the first component and the grounding bushing between a head of the fastener and the vehicle body rail and thereby cause the grounding bushing to pierce through the coating disposed on the vehicle body rail to provide the ground connection between the first component and the vehicle body rail.

12. The method of claim 11 further comprising securing the grounding bushing within the aperture in the second component using a press fit.

13. The method of claim 11 further comprising inserting a grounding bushing into the aperture in the second component until an annular flange on the grounding bushing abuts a shoulder on the second component.

14. The method of claim 11 further comprising:
aligning an aperture in the first component with an aperture in the grounding bushing; and
inserting the fastener through the aperture in the first component, through the aperture in the second component, and into the vehicle body rail.

15. The method of claim 11 further comprising fastening the second component to the first component before inserting the fastener through the first component, through the grounding bushing, and into the vehicle body rail.

16. The method of claim 11 further comprising tightening the fastener by threading the fastener into a clinch nut mounted within an aperture in the vehicle body rail.

17. The method of claim 11 wherein the first component is formed of a non-conductive material.

18. The method of claim 11 wherein the vehicle body rail is formed of a first material and the grounding bushing is formed of a second material that is harder than the first material.

19. The method of claim 11 wherein the first component is a tray of a battery pack and the second component is a cover of the battery pack.

20. The method of claim 11 wherein the coating includes at least one of an electro paint operation (ELPO) coating, a paint coating, and an oxidation coating.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Schlaupitz Christopher A
• Witting Daniel F

Classifications

• H01R2201/26

  for vehicles · CPC title

• H01R4/304 Primary

  having means for improving contact · CPC title

• H01R4/64

  Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail · CPC title

• H01R4/66 Primary

  Connections with the terrestrial mass, e.g. earth plate, earth pin · CPC title