Brake assembly with active piston retraction

Patent metadata

Field	Value
Publication number	US-12000443-B2
Application number	US-202117502021-A
Country	US
Kind code	B2
Filing date	Oct 14, 2021
Priority date	Oct 14, 2021
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A brake assembly comprises: a brake piston configured to be movable for a brake apply or release and having an inner wall forming a piston cavity, wherein a groove is formed on the inner wall of the brake piston; a linearly movable structure positioned within the piston cavity of the brake piston and configured to be linearly movable within the piston cavity; and a resilient material, wherein a part of the resilient material is located within the groove formed on the inner wall of the brake piston and the other part of the resilient material is disposed on an outer surface of the linearly movable structure so that the resilient material is engageable with a surface of the groove formed on the inner wall of the brake piston to move the brake piston by restoring force of the resilient material in response to linear movement of the linearly movable structure.

First claim

What is claimed is:

1. A brake assembly comprising:
a brake piston configured to be movable for a brake apply or release, the brake piston having an inner wall forming a piston cavity, wherein a groove is formed on the inner wall of the brake piston;
a linearly movable structure positioned within the piston cavity of the brake piston, the linearly movable structure configured to be linearly movable within the piston cavity in response to rotation of a rotatable structure operably coupled to the linearly movable structure; and
a resilient material, wherein at least a part of the resilient material is located within the groove formed on the inner wall of the brake piston and an other part of the resilient material is disposed on an outer surface of the linearly movable structure positioned within the piston cavity of the brake piston so that the resilient material is engageable with side walls of the groove formed on the inner wall of the brake piston to move the brake piston by a restoring force of the resilient material in response to linear movement of the linearly movable structure,
wherein the resilient material does not contact a circumferential surface formed between the side walls of the groove of the brake piston so that the resilient material is movable between the side walls of the groove of the brake piston without contacting the side walls of the groove of the brake piston.

2. The brake assembly of claim 1 , wherein the linearly movable structure positioned within the inner wall of the brake piston is a spindle nut, and the rotatable structure operably coupled to the linearly movable structure is a spindle.

3. The brake assembly of claim 1 , wherein the resilient material fixed to the outer surface of the linearly movable structure is configured to be at least partially deformable in an area of contact with one of the side walls of the groove formed on the inner wall of the brake piston and move the brake piston by the restoring force of the resilient material against one of the side walls of the groove formed on the inner wall of the brake piston.

4. The brake assembly of claim 1 , wherein the resilient material disposed on the outer surface of the linearly movable structure is configured to retract the brake piston during the brake release.

5. The brake assembly of claim 1 , wherein the other part of the resilient material is disposed in another groove formed on the outer surface of the linearly movable structure, and the at least part of the resilient material is positioned within the groove formed on the inner wall of the brake piston.

6. The brake assembly of claim 1 , wherein the linearly movable structure comprises a head portion configured to contact the brake piston during the brake apply, and a body portion extended from the head portion of the linearly movable structure, wherein an outer diameter of the head portion of the linearly movable structure is larger than an outer diameter of the body portion of the linearly movable structure, and the resilient material is mounted to the head portion of the linearly movable structure.

7. The brake assembly of claim 6 , wherein one or more holes are formed at the head portion of the linearly movable structure.

8. The brake assembly of claim 1 , wherein the resilient material is mounted to a portion of the linearly movable structure where an outer diameter of the linearly movable structure is largest.

9. The brake assembly of claim 1 , wherein the resilient material has a shape of an O-ring.

10. The brake assembly of claim 1 , wherein the resilient material has a shape of a polygonal ring.

11. The brake assembly of claim 1 , wherein the groove formed on the inner wall of the brake piston has a space that the resilient material is movable therein.

12. A brake assembly comprising:
a caliper having a caliper cavity;
a brake pad coupled to the caliper;
a brake piston mounted in the caliper cavity and configured to be movable to displace the brake pad for a brake apply or release, the brake piston having an inner wall forming a piston cavity, wherein a groove is formed on the inner wall of the brake piston;
a spindle nut positioned within the piston cavity of the brake piston, the spindle nut configured to be linearly movable within the piston cavity in response to rotation of a spindle;
the spindle operably coupled to the spindle nut; and
a resilient material, wherein at least a part of the resilient material is located within the groove formed on the inner wall of the brake piston and an other part of the resilient material is disposed on an outer surface of the spindle nut positioned within the piston cavity of the brake piston so that the resilient material is engageable with side walls of the groove formed on the inner wall of the brake piston to move the brake piston by a restoring force of the resilient material in response to linear movement of the spindle nut,
wherein the resilient material does not contact a circumferential surface formed between the side walls of the groove of the brake piston so that the resilient material is movable between the side walls of the groove of the brake piston without contacting the side walls of the groove of the brake piston.

13. The brake assembly of claim 12 , wherein the resilient material fixed to the outer surface of the spindle nut is configured to be at least partially deformable in an area of contact with one of the side walls of the groove formed on the inner wall of the brake piston so that the resilient material exerts the restoring force against one of the side walls of the groove formed on the inner wall of the brake piston to move the brake piston.

14. The brake assembly of claim 12 , wherein the resilient material disposed on the outer surface of the spindle nut is configured to retract the brake piston during the brake release so that the brake pad is retracted in a direction away from a brake rotor.

15. The brake assembly of claim 12 , wherein the other part of the resilient material is disposed in another groove formed on the outer surface of the spindle nut, and the at least a part of the resilient material is located within the groove formed on the inner wall of the brake piston.

16. The brake assembly of claim 12 , wherein the spindle nut comprises a head portion configured to contact the brake piston during the brake apply, and a body portion extended from the head portion of the spindle nut, wherein an outer diameter of the head portion of the spindle nut is larger than an outer diameter of the body portion of the spindle nut, and the resilient material is mounted to the head portion of the spindle nut.

17. The brake assembly of claim 16 , wherein one or more holes are formed at the head portion of the spindle nut.

18. The brake assembly of claim 12 , wherein the resilient material is mounted to a portion of the spindle nut where an outer diameter of the spindle nut is largest.

19. The brake assembly of claim 12 , wherein the resilient material has a shape of an O-ring or a polygonal ring.

20. The brake assembly of claim 12 , wherein the groove formed on the inner wall of the brake piston has a space that the resilient material is movable therein.

Assignees

• Hl Mando Corp

Inventors

• Baek Hyungjin
• Smith Daniel

Classifications

• F16D55/226 Primary

  in which the common actuating member is moved axially {, e.g. floating caliper disc brakes} · CPC title

• B60T1/065 Primary

  employing disc (B60T1/062 takes precedence) · CPC title

• B60T13/58

  Combined or convertible systems · CPC title

• B60T13/741

  acting on an ultimate actuator · CPC title

• B60T13/746

  and mechanical transmission of the braking action · CPC title