Brake shoe for a drum brake

Patent metadata

Field	Value
Publication number	US-9869358-B2
Application number	US-201414160071-A
Country	US
Kind code	B2
Filing date	Jan 21, 2014
Priority date	Jan 24, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

The invention relates to a brake shoe for a drum brake and a drum brake that includes a supporting unit and a lining unit, wherein the supporting unit comprises a bearing portion for pivotable support and an actuation portion, and wherein the supporting unit has a bending stiffness, which has different values between the bearing portion and the actuation portion.

First claim

The invention claimed is:

1. A brake shoe for a drum brake, comprising:
a supporting unit, which comprises a bearing portion for pivotable support, an actuation portion, a first supporting portion adjacent the bearing portion and a second supporting portion adjacent the actuation portion; and
a lining unit having a first lining portion and a second lining portion where a majority of the first lining portion is positioned adjacent the first supporting portion and a majority of the second lining portion is positioned adjacent the second supporting portion;
wherein the supporting unit has a bending stiffness that increases from the bearing portion toward the actuation portion such that the second supporting portion has a greater bending stiffness than the first support portion;
wherein the first and second supporting portions of the supporting unit comprise a web plate and a lining plate, wherein the at least one of the web plate and the lining plate of the first and second supporting portions has at least one of a cross-section area and a surface which increases from the bearing portion towards the actuation portion; and
wherein when an actuation force smaller than a limiting force is applied to the actuation portion the lining unit shows a braking effect in the first lining portion only, and when an actuation force larger than the limiting force is applied the lining unit shows a braking effect also in the second lining portion.

2. The brake shoe of claim 1 , wherein the at least one of the cross-sectional area and the surface comprises a material gauge.

3. The brake shoe of claim 1 , wherein the supporting unit comprises at least one local material weakness, which reduces the bending stiffness of the supporting unit.

4. The brake shoe of claim 1 , wherein the actuation portion comprises a first engagement portion and a second engagement portion, wherein the first engagement portion is designed to transmit an actuation force smaller than a limiting force to the supporting unit, and wherein the second engagement portion is designed to transmit an actuation force larger than the limiting force to the supporting unit.

5. The brake shoe of claim 3 , wherein the first lining portion comprises a material having a greater abrasion resistance than the second lining portion.

6. The brake shoe of claim 3 , wherein the second lining portion comprises a material having a higher coefficient of friction than the first lining portion.

7. The brake shoe of claim 6 , wherein the coefficient of friction of the second lining portion is within the range of from about 1.1 to about 3 times the coefficient of friction of the first lining portion.

8. The brake shoe of claim 7 , wherein the coefficient of friction of the second lining portion is within the range of 1.15 to 2 times the coefficient of friction of the first lining portion.

9. The brake shoe of claim 8 , wherein the coefficient of friction of the second lining portion is within the range of 1.3 to 1.7 times the coefficient of friction of the first lining portion.

10. The brake shoe of claim 1 , wherein the lining plate includes at the first lining portion a first thickness that is proximate the bearing portion and at the second lining portion a second thickness that is proximate the actuation portion.

Assignees

• Saf Holland Gmbh
• Saf Holland Gmbh

Inventors

• Wallmeier Stefan
• Roos Michael

Classifications

• F16D2069/002

  Combination of different friction materials · CPC title

• F16D65/08 Primary

  for internally-engaging brakes · CPC title

• F16D51/16

  shaped as brake-shoes pivoted on a fixed or nearly-fixed axis · CPC title