ACTUATION MECHANISM

• US 20190331181A1
• Filed: 04/10/2019
• Published: 10/31/2019
• Est. Priority Date: 04/30/2018
• Status: Active Grant

• Current Assignee: Meritor Heavy Vehicle Braking Systems UK Ltd. (Meritor, Inc. (Nevada))
• Original Assignee: Meritor Heavy Vehicle Braking Systems UK Ltd. (Meritor, Inc. (Nevada))
• Inventors: Kulkarni, Sanjeev, Taylor, Martin, Kumar, Arun
• Granted Patent: US 10,895,296 B2
• Time in Patent Office: Days
• CPC Class Codes: F16D 2121/02 Fluid pressure
• CPC Class Codes: F16D 2121/14 Mechanical
• CPC Class Codes: F16D 2121/24 using motors
• CPC Class Codes: F16D 2125/32 acting on one cam follower
• CPC Class Codes: F16D 55/22 by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
• CPC Class Codes: F16D 55/2255 in which the common actuating member is pivoted
• CPC Class Codes: F16D 65/0068 Brake calipers
• CPC Class Codes: F16D 65/18 adapted for drawing members together , e.g. for disc brakes
• CPC Class Codes: F16D 65/42 non-automatic
• CPC Class Codes: F16D 65/52 self-acting in one direction for adjusting excessive play
• CPC Class Codes: F16D 65/567 for mounting on a disc brake

Abstract

An operating shaft and an actuation mechanism for a disc brake. The actuation mechanism may include a wear adjuster mechanism and the operating shaft. The operating shaft may include opposed pairs of arcuate surfaces arranged with offset axes of rotation and a recess therebetween for accommodating a portion of the wear adjuster mechanism.

Claims

1. An actuation mechanism for a disc brake, the actuation mechanism comprising:

a wear adjuster mechanism having an input driving portion; and

an operating shaft that includes;

opposed pairs of arcuate surfaces arranged with offset axes of rotation, one arcuate surface of each pair arranged to be grounded to a housing of the disc brake and the other arcuate surface of each pair arranged to transmit an actuating force to a brake pad of the disc brake upon rotation of the operating shaft; and

a recess intermediate the pairs of arcuate surfaces for accommodating a portion of the wear adjuster mechanism; and

wherein one of the operating shaft and the input driving portion further comprises a pin arranged to engage a corresponding slot of the other of the operating shaft or input driving portion, the pin extending at a non-zero angle with respect to both the axes of rotation and a direction of transmission of the actuating force.

2. The actuation mechanism of claim 1 wherein the pin is a separate component from the operating shaft or input driving portion and is mounted to the operating shaft or input driving portion.

3. The actuation mechanism of claim 2 wherein the operating shaft or input driving portion comprises a hole arranged to receive the pin.

4. The actuation mechanism of claim 3 wherein the pin is dimensioned to be a press-fit or interference fit within the hole.

5. The actuation mechanism of claim 1 wherein the pin is provided with a part-spherical head.

6. The actuation mechanism of claim 5 wherein the part-spherical head has a diameter greater than a shank of the pin.

7. The actuation mechanism of claim 1 wherein the pin has a flattened region at an end remote from a shank of the pin.

8. The actuation mechanism of claim 1 wherein the pin has a flattened region on a surface that faces a lateral midpoint of the recess.

9. The actuation mechanism of claim 1 wherein the pin extends adjacent to a wall of the operating shaft defining a perimeter of the recess.

10. The actuation mechanism of claim 1 wherein the pin is mounted to the operating shaft.

11. The actuation mechanism of claim 10 wherein the operating shaft comprises a tongue of material extending into the recess and a hole is provided in the tongue.

12. The actuation mechanism of claim 1 wherein the non-zero angle is between 55°

and 85°

with respect to the axes of rotation.

13. A disc brake adapted to be air, hydraulically or electrically actuated, the disc brake comprising:

a housing;

a wear adjuster mechanism having an input driving portion; and

an operating shaft that includes;

opposed pairs of arcuate surfaces arranged with offset axes of rotation, one arcuate surface of each pair arranged to be grounded to the housing and the other arcuate surface of each pair arranged to transmit an actuating force to a brake pad of the disc brake upon rotation of the operating shaft; and

a recess intermediate the pairs of arcuate surfaces for accommodating a portion of the wear adjuster mechanism; and

wherein one of the operating shaft and the input driving portion further comprises a pin arranged to engage a corresponding slot of the other of the operating shaft or input driving portion, the pin extending at a non-zero angle with respect to both the axes of rotation and a direction of transmission of the actuating force.

14. The disc brake of claim 13 wherein the wear adjuster mechanism comprises a manual adjuster shaft at least partially disposed in the recess.

15. An operating shaft for a disc brake, the operating shaft comprising:

opposed pairs of arcuate surfaces arranged with offset axes of rotation, one arcuate surface of each pair adapted to be grounded to a housing of the disc brake and the other arcuate surface of each pair adapted to transmit an actuating force to a brake pad of the disc brake upon rotation of the operating shaft;

a recess intermediate the pairs of arcuate surfaces for accommodating a portion of a wear adjuster mechanism; and

a pin adapted to engage a corresponding input driving portion of the wear adjuster mechanism, the pin extending from the operating shaft at a non-zero angle with respect to the axes of rotation and a direction of force transmission.

16. The operating shaft of claim 15 wherein the pin is a separate component from the operating shaft and is mounted to the operating shaft.

17. The operating shaft of claim 16 wherein the operating shaft comprises a hole arranged to receive the pin.

18. The operating shaft of claim 17 wherein the pin is dimensioned to be a press-fit or interference fit within the hole.

19. The operating shaft of claim 15 wherein the pin is provided with a part-spherical head.

20. The operating shaft of claim 19 wherein the part-spherical head has a diameter greater than a shank of the pin.