Drum brake assembly

Patent metadata

Field	Value
Publication number	US-12352325-B2
Application number	US-202217859264-A
Country	US
Kind code	B2
Filing date	Jul 7, 2022
Priority date	Jul 7, 2022
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A drum brake assembly for a vehicle includes a brake drum. First and second brake shoes are displaceable between a rest condition in which the first and second brake shoes are spaced from the brake drum and a braking condition in which the first and second brake shoes engage the brake drum. A first spring applies a force between the first brake shoe and a fixed component of the vehicle. A second spring applies a force between the second brake shoe and the fixed component of the vehicle. The first and second springs biasing the first and second brake shoes to the rest condition.

First claim

Having described the invention, the following is claimed:

1. A drum brake assembly for a vehicle, comprising:
a brake drum;
first and second brake shoes displaceable between a rest condition in which the first and second brake shoes are spaced from the brake drum and a braking condition in which the first and second brake shoes engage the brake drum;
a first spring applying a force between the first brake shoe and a fixed component of the vehicle;
a second spring applying a force between the second brake shoe and the fixed component of the vehicle, the first and second springs biasing the first and second brake shoes to the rest condition, wherein the fixed component is a post that is between the first and second brake shoes; and
a drum-in-hat adapter adapted to secure a portion of the drum brake assembly to an axle case of the vehicle, the post extending from the drum-in-hat adapter, a longitudinal axis of the post and a longitudinal axis of the drum-in-hat adapter lying in a plane, the first spring urging the first brake shoe towards the plane and the rest condition.

2. The drum brake assembly recited in claim 1 , wherein the first and second brake shoes have opposite first and second ends, the first ends being biased to the rest condition by at least one return spring, the first and second springs biasing the second ends of the first and second brake shoes to the rest condition.

3. The drum brake assembly recited in claim 2 , wherein the first ends of the first and second brake shoes engage a shoe anchor in the rest condition.

4. The drum brake assembly recited in claim 2 , further comprising a manual brake shoe adjusting mechanism operably connected to the second ends of the first and second brake shoes.

5. The drum brake assembly recited in claim 2 , further comprising an actuator adjacent the first ends of the first and second brake shoes for moving the first and second brake shoes from the rest condition to the braking condition.

6. The drum brake assembly recited in claim 1 , wherein the first brake shoe is prevented from contacting the brake drum by the first spring when a parking brake of the vehicle is not in use.

7. The drum brake assembly recited in claim 1 , wherein the first spring does not apply a force directly to the second brake shoe and the second spring does not apply a force directly to the first brake shoe.

8. The drum brake assembly recited in claim 1 , wherein the first spring has a first end connected to the first brake shoe and a second end connected to the post, the second spring having a first end connected to the second brake shoe and a second end connected to the post.

9. The drum brake assembly recited in claim 8 , wherein the second ends of the first and second springs are directly connected to the post.

10. The drum brake assembly recited in claim 1 , wherein the second spring urges the second brake shoe towards the plane and the rest condition.

11. The drum brake assembly recited in claim 1 , wherein the first brake shoe is spaced from the post in the rest condition.

12. The drum brake assembly recited in claim 1 , further comprising:
a shield at least partially overlying the drum-in-hat adapter, the post being directly connected to one of the shield and the drum-in-hat adapter.

13. The drum brake assembly recited in claim 12 , wherein the post is directly connected to and extends from the drum-in-hat adapter.

14. The drum brake assembly recited in claim 13 , wherein the post extends through an opening in the shield.

15. The drum brake assembly recited in claim 1 , wherein the drum brake assembly is a duo-servo drum brake assembly.

Assignees

• Zf Active Safety Us Inc

Inventors

• Wernette Matthew

Classifications

• F16D65/22

  adapted for pressing members apart {, e.g. for drum brakes} · CPC title

• F16D2051/003

  Brake supports · CPC title

• F16D2051/005

  Protective covers · CPC title

• F16D65/42 Primary

  non-automatic · CPC title

• F16D51/22

  mechanically actuated · CPC title