Disc brake, brake actuation mechanism for such a disc brake and method for brake adjustment

Patent metadata

Field	Value
Publication number	US-10480602-B2
Application number	US-201314775407-A
Country	US
Kind code	B2
Filing date	Mar 11, 2013
Priority date	Mar 11, 2013
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A disc brake including a brake actuation mechanism and an adjustment mechanism, which is configured to provide, in addition to a reduction of the clearance between a brake pad and a brake disc during brake application, a further increase of the clearance during brake release motion with a value, which may be smaller, equal or larger than the previous clearance reduction. The brake actuation mechanism for that purpose could provide a different regulator unit. Moreover, the invention suggests a method for adjusting the clearance between a brake pad and a brake disc providing a clearance increase during brake release motion, accordingly.

First claim

The invention claimed is:

1. A disc brake comprising a brake caliper, which straddles at least one brake disc, and a brake actuation mechanism comprising:
an amplification mechanism for introducing a clamping force,
a thrust element for transmitting the clamping force via a brake pad onto the brake disc, in which, at the release state of the disc brake, a clearance is set between said brake pad and the brake disc,
an adjustment mechanism for compensation of wear of said brake pad and/or said brake disc during brake actuation, the adjustment mechanism being configured to act on said thrust element and comprising a first automatic brake adjuster being configured to reduce said clearance between the brake disc and the brake pad during brake actuation motion,
characterized by
a second automatic brake adjuster being configured to, during brake release motion, increase said clearance with a value, which may be smaller, equal or larger than the clearance reduction,
in which the first automatic brake adjuster and/or the second automatic brake adjuster are formed as a torque limiting clutch, respectively.

2. The disc brake according to claim 1 , in which the first automatic brake adjuster and the second automatic brake adjuster are mechanically activated.

3. The disc brake according to claim 1 , in which the second automatic brake adjuster is cooperating with components of the adjustment mechanism and/or components of the first automatic brake adjuster.

4. The disc brake according to claim 3 , in which the second automatic brake adjuster is at least partly incorporated in the adjustment mechanism and/or in the first automatic brake adjuster.

5. The disc brake according to claim 1 , in which the second automatic brake adjuster is incorporated in a return mechanism for the brake actuation mechanism.

6. The disc brake according to claim 1 , in which the second automatic brake adjuster is configured to increase said clearance to a predetermined value during brake release motion.

7. The disc brake according to claim 1 , in which the second automatic brake adjuster is configured to increase said clearance with a predetermined value during brake release motion.

8. The disc brake according to claim 6 , in which the second automatic brake adjuster comprises at least two components which are arranged relative to each other so as to comprise an angular slack between them, which angular slack is taken up during brake release motion thereby providing the predetermined value for clearance increase.

9. A brake actuation mechanism for a disc brake comprising:
an amplification mechanism for introducing a clamping force onto a thrust element, which transmits the clamping force via a brake pad onto a brake disc of the disc brake,
an adjustment mechanism for compensation of wear of said brake pad and/or said brake disc during brake actuation, the adjustment mechanism being configured to act on said thrust element and comprising a first automatic brake adjuster being configured to reduce said clearance between the brake disc and the brake pad during brake actuation motion,
characterized by
a second automatic brake adjuster being configured to, during brake release motion, increase said clearance with a value, which may be smaller, equal or larger than the clearance reduction,
wherein said first automatic brake adjuster includes a torque limiting clutch and a first one-way clutch and said second automatic brake adjuster includes a second one-way clutch.

10. The brake actuation mechanism according to claim 9 , in which the first automatic brake adjuster and the second automatic brake adjuster are mechanically activated.

11. The brake actuation mechanism according to claim 9 , in which the second automatic brake adjuster is cooperating with components of the adjustment mechanism and/or components of the first automatic brake adjuster.

12. The brake actuation mechanism according to claim 11 , in which the second automatic brake adjuster is at least partly incorporated in the adjustment mechanism and/or in the first automatic brake adjuster.

13. The brake actuation mechanism according to claim 9 , in which the second automatic brake adjuster is incorporated in a return mechanism for the brake actuation mechanism.

14. The brake actuation mechanism according to claim 9 , in which the first automatic brake adjuster and/or the second automatic brake adjuster are formed as a torque limiting clutch, respectively.

15. The brake actuation mechanism according to claim 9 , in which the second automatic brake adjuster is configured to increase said clearance to a predetermined value during brake release motion.

16. The brake actuation mechanism according to claim 9 , in which the second automatic brake adjuster is configured to increase said clearance with a predetermined value during brake release motion.

17. The brake actuation mechanism according to claim 15 , in which the second automatic brake adjuster comprises at least two components which are arranged relative to each other so as to comprise an angular slack between them, which angular slack is taken up during brake release motion thereby providing the predetermined value for clearance increase.

18. A method of adjusting a clearance between a brake pad and a brake disc of a disc brake to a predefined value, the disc brake having an amplification mechanism for introducing a clamping force, a thrust element for transmitting the clamping force via a brake pad onto the brake disc, in which, at the release state of the disc brake, a clearance is set between said brake pad and the brake disc, a first automatic brake adjuster including a torque limiting clutch and a first one-way clutch and a second automatic brake adjuster including a second one-way clutch, performing the steps of:
reducing excessive clearance between the brake pad and the brake disc with the first automatic brake adjuster during brake actuation motion, which excessive clearance results from the actual wear of the brake pad and/or of the brake disc, during brake actuation motion before the brake pad comes into force contact with the brake disc; and
increasing the clearance between the brake pad and the brake disc with the second automatic brake adjuster through an angular slack of the second one-way clutch during brake release motion after the brake pad has lost force contact with the brake disc.

19. The method according to claim 18 , in which both steps are alternately and consecutively repeated over several brake actuation and brake return motions.

20. The method according to claim 18 , in which the step of increasing the clearance is performed with the same amount at every brake release motion.

21. The method according to claim 18 , in which during brake actuation motion the clearance is adjusted to a first value and during brake release motion the clearance is increased to a second value, which second value is larger than the first value.

22. The method according to claim 18 , in which both steps are mechanically performed.

23. The method according to claim 18 , wherein the excessive clearance between the brake pad and the brake disc is compensated for by a first automatic brake adjuster of the adjustment mechanism.

24. The method according to claim 18 , wherein the clearance during brake release motion after the brake pad has lost force contact with the brake disc is increased by a second automatic brake adjuster of the adjustment mechanism.

Assignees

• Haldex Brake Prod Ab

Inventors

• Sandberg Stefan

Classifications

• F16D65/66 Primary

  with screw-thread and nut · CPC title

• F16D2125/28

  Cams; Levers with cams · CPC title

• F16D65/0068

  Brake calipers · CPC title

• F16D65/567

  for mounting on a disc brake · CPC title

• F16D2055/0016

  Brake calipers · CPC title