Drum brake

Patent metadata

Field	Value
Publication number	US-10088001-B2
Application number	US-201515328336-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 24, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

The invention relates to a drum brake, in particular for commercial vehicles, comprising a first brake shoe and a second brake shoe, wherein the first brake shoe is arranged as a leading brake shoe in the drum brake, wherein the second brake shoe is arranged as a trailing brake shoe in the drum brake, wherein at least one leading lining element can be fixed on the first brake shoe, and at least one trailing lining element can be fixed on the second brake shoe, wherein the number of leading lining elements fixed on the first brake shoe is greater than the number of trailing lining elements fixed on the second brake shoe.

First claim

The invention claimed is:

1. A drum brake for a commercial vehicle, comprising:
a first brake shoe;
a second brake shoe, wherein the first brake shoe is arranged as a leading brake shoe in the drum brake, and the second brake shoe is arranged as a trailing brake shoe in the drum brake;
at least one leading lining element configured to be fixed on the first brake shoe; and
at least one trailing lining element configured be fixed on the second brake shoe, wherein the number of leading lining elements fixed on the first brake shoe is greater than the number of trailing lining elements fixed on the second brake shoe;
wherein a first leading lining element of the at least one leading line element includes a first friction area and a second leading lining element of the at least one leading line element includes a second friction area configured to be fixed on the first brake shoe;
wherein the sizes of the first friction area and the second friction area are different from one another;
wherein all the lining elements of the at least one leading line element and the at least one trailing lining element are formed from the same material; and
wherein the at least one leading lining element and the at least one trailing lining element each have a friction area, wherein a sum of the friction areas of the leading lining elements of the at least one leading lining elements gives a leading friction area, wherein a sum of the friction areas of the trailing lining elements of the at least one leading lining elements gives a trailing friction area, and wherein a ratio of the leading friction area to the trailing friction area is from 1.5 to 4.5.

2. The drum brake as claimed in claim 1 , wherein at least one of at least one leading lining element is identical to at least one of the at least one trailing lining element.

3. The drum brake as claimed in claim 1 , wherein the ratio of the leading friction area to the trailing friction area is from 2 to 4.

4. The drum brake as claimed in claim 3 , wherein the ratio of the leading friction area to the trailing friction area is from 2.75 to 3.25.

5. The drum brake as claimed in claim 1 , wherein the first brake shoe is identical to the second brake shoe.

6. The drum brake as claimed in claim 5 , wherein the ratio of the second friction area to the first friction area is from 0.25 to 0.75.

7. The drum brake as claimed in claim 6 , wherein the ratio of the second friction area to the first friction area is from 0.45 to 0.55.

8. The drum brake as claimed in claim 6 , wherein the friction area of the at least one trailing lining element is equal to at least one of the first friction area and the second friction area.

9. The drum brake as claimed in claim 8 , wherein at least two leading lining elements of the at least one leading lining element are identical to one another.

10. The drum brake as claimed in claim 9 , wherein three leading lining elements of the at least one leading lining element are fixed on the first brake shoe, and wherein one trailing lining element of the at least one trailing lining element is fixed on the second brake shoe.

11. The drum brake as claimed in claim 10 , wherein the lining elements each have a fastening section configured to fix each lining element on at least one of the first brake shoe and the second brake shoe, and wherein the fastening sections of the lining elements are identical.

12. The drum brake as claimed in claim 1 , wherein the at least one leading lining element and the at least one trailing lining element each have a friction area; wherein a sum of the friction areas of the leading lining elements of the at least one leading lining elements gives a leading friction area, wherein a sum of the friction areas of the trailing lining elements of the at least one leading lining elements gives a trailing friction area, and wherein a ratio of the leading friction area to the trailing friction area is from 1.5 to 4.5.

13. The drum brake as claimed in claim 12 , wherein the ratio of the leading friction area to the trailing friction area is from 2 to 4.

14. The drum brake as claimed in claim 13 , wherein the ratio of the leading friction area to the trailing friction area is from 2.75 to 3.25.

15. The drum brake as claimed in claim 1 , wherein the first brake shoe is identical to the second brake shoe.

16. The drum brake as claimed in claim 1 , wherein the ratio of the second friction area to the first friction area is from 0.25 to 0.75.

17. The drum brake as claimed in claim 16 , wherein the ratio of the second friction area to the first friction area is from 0.45 to 0.55.

18. The drum brake as claimed in claim 16 , wherein the friction area of the at least one trailing lining element is equal to at least one of the first friction area and the second friction area.

19. The drum brake as claimed in claim 1 , wherein at least two leading lining elements of the at least one leading lining element are identical to one another.

20. The drum brake as claimed in claim 1 , wherein three leading lining elements of the at least one leading lining element are fixed on the first brake shoe, and wherein one trailing lining element of the at least one trailing lining element is fixed on the second brake shoe.

21. The drum brake as claimed in claim 1 , wherein the lining elements each have a fastening section configured to fix each lining element on at least one of the first brake shoe and the second brake shoe, and wherein the fastening sections of the lining elements are identical.

22. A drum brake for a commercial vehicle, comprising:
a first brake shoe;
a second brake shoe, wherein the first brake shoe is arranged as a leading brake shoe in the drum brake, and the second brake shoe is arranged as a trailing brake shoe in the drum brake;
at least one leading lining element configured to be fixed on the first brake shoe; and
at least one trailing lining element configured be fixed on the second brake shoe, wherein the number of leading lining elements fixed on the first brake shoe is greater than the number of trailing lining elements fixed on the second brake shoe;
wherein a first leading lining element of the at least one leading line element includes a first friction area and a second leading lining element of the at least one leading line element includes a second friction area configured to be fixed on the first brake shoe;
wherein the sizes of the first friction area and the second friction area are different from one another;
wherein a ratio of the second friction area to the first friction area is from 0.1 to 0.8;
wherein all the lining elements of the at least one leading line element and the at least one trailing lining element are formed from the same material; and
wherein the at least one leading lining element and the at least one trailing lining element each have a friction area; wherein a sum of the friction areas of the leading lining elements of the at least one leading lining elements gives a leading friction area, wherein a sum of the friction areas of the trailing lining elements of the at least one leading lining elements gives a trailing friction area, and wherein a ratio of the leading friction area to the trailing friction area is from 1.5 to 4.5.

23. The drum brake as claimed in claim 22 , wherein the ratio of the leading friction area to the trailing friction area is from 2 to 4.

24. The drum brake as claimed in claim 23 , wherein the ratio of the lead

Assignees

• Saf Holland Gmbh

Inventors

• Drewes Olaf

Classifications

• F16D2125/30

  acting on two or more cam followers, e.g. S-cams · CPC title

• F16D2069/0433

  Connecting elements not integral with the braking member, e.g. bolts, rivets · CPC title

• F16D69/00

  Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces (clutching elements F16D13/60; braking members F16D65/02) · CPC title

• F16D51/20 Primary

  extending in opposite directions from their pivots · CPC title

• F16D2069/0441

  Mechanical interlocking, e.g. roughened lining carrier, mating profiles on friction material and lining carrier · CPC title