Brake pad and method of forming such

Patent metadata

Field	Value
Publication number	US-9689448-B2
Application number	US-201314433646-A
Country	US
Kind code	B2
Filing date	Oct 15, 2013
Priority date	Oct 15, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A brake pad for a brake system, the brake pad comprising:
a first brake pad surface having a coefficient of friction, the brake pad being for contact, in use, with a first radial portion of a component having a rotation axis, wherein: at a first point on the first brake pad surface the coefficient of friction has a first value; at a second point on the first brake pad surface the coefficient of friction has a second value greater than the first value; and at a third point on the first brake pad surface the coefficient of friction has a third value greater than the second value, wherein, in use, the first, second and third points are configured to be contactable with corresponding points on the first radial portion of the component at locations of increasing radial distance from the rotation axis so that the second point is further from the rotation axis than the first point, and the third point is further from the rotation axis than the second point.

First claim

The invention claimed is:

1. A brake pad for a brake system, the brake pad comprising:
a first, substantially planar, brake pad surface having a coefficient of friction, the first substantially planar brake pad surface being removably contactable, in use, with a first radial portion of a brake disc having a rotation axis, wherein:
at a first point on the first brake pad surface the coefficient of friction has a first value;
at a second point on the first brake pad surface the coefficient of friction has a second value greater than the first value; and
at a third point on the first brake pad surface the coefficient of friction has a third value greater than the second value,
wherein, in use, the first, second and third points are configured to be contactable with corresponding points on the first radial portion of the component at locations of increasing radial distance from the rotation axis so that the second point is further from the rotation axis than the first point, and the third point is further from the rotation axis than the second point,
wherein the first point is positioned at a first edge of the first brake pad surface being relatively proximal, in use, to the rotation axis, and the third point is positioned at a third edge of the first brake pad surface being relatively distal, in use to the rotation axis; and
wherein the first substantially planar brake pad surface substantially occupies an area between a first terminal edge of the brake pad, proximal to the rotation axis in use, and a second terminal edge of the brake pad, distal to the rotation axis in use.

2. A brake pad as claimed in claim 1 , wherein the coefficients of friction at each of the first, second and third points are related by a linear relationship.

3. A brake pad as claimed in claim 1 , wherein, in use, a force presses the first brake pad surface onto the radial portion of the component.

4. A brake pad as claimed in claim 3 , wherein, in use, the force acts adjacent to the third point.

5. A brake pad as claimed in claim 1 , wherein the first brake pad surface is a substantially arcuate planar shape.

6. A brake pad as claimed in claim 1 , wherein the first brake pad surface comprises at least three layers being layered in a radial direction, wherein each layer has a surface that forms part of the first brake pad surface, each layer surface having a coefficient of friction wherein the first point is on the surface of a first one of the layers, the second point is on the surface of a second one of the layers, and the third point is on a third one of the layers.

7. A brake pad as claimed in claim 6 , wherein the first brake pad surface comprises the first, second and third ones of the at least three layers and at least one additional layer of the at least three layers, each of the additional layers being layered adjacent to or between the first, second and third ones of the at least three layers.

8. A brake pad as claimed in claim 7 , wherein the coefficient of friction of each of the at least three layers of the first brake pad surface is configured to be greater than the coefficient of friction of an adjacent layer where, in use, the adjacent layer is radially closer to the rotation axis.

9. A brake pad as claimed in claim 6 , wherein each layer has a material composition that each provide the different coefficients of friction at the first, second and third points.

10. A brake pad as claimed in claim 6 , wherein the surface of each layer comprises a surface treatment.

11. A brake pad as claimed in claim 6 , wherein each layer has a substantially arcuate shape.

12. A brake pad as claimed in claim 11 , wherein, in use, to the rotation axis, and wherein, in use, arcs of the first and third edges are arcs of circles with the rotation axis at their center.

13. A brake pad as claimed in claim 6 , wherein the thickness of each layer surface in the radial direction is substantially similar.

14. A brake pad as claimed in claim 1 , wherein the coefficient of friction of adjacent points have a difference in coefficient of friction between 0.05 and 0.2.

15. A brake pad as claimed in claim 14 , wherein the difference in coefficient of friction is between 0.08 and 0.12.

16. A brake pad as claimed in claim 1 , wherein the substantially planar first brake pad surface is configured to contact the radial component with the first, second, and third points simultaneously.

17. A method of forming a brake pad for a brake system, the brake pad comprising a first, substantially planar, brake pad, the method comprising:
providing a first portion of the substantially planar brake pad surface having a first coefficient of friction at a first point on the brake pad surface, wherein the substantially planar brake pad surface is removably contactable, in use, with radial portion of a brake disc having a rotation axis;
providing a second portion of the substantially planar brake pad surface having a second coefficient of friction at a second point on the brake pad surface; and,
providing a third portion of the substantially planar brake pad surface having a third coefficient of friction at a third point on the brake pad surface;
wherein, in use, the first, second and third points are configured to be contactable with corresponding points on the first radial portion of the component at locations of increasing radial distance from the rotation axis so that the second point is further from the rotation axis than the first point, and the third point is further from the rotation axis than the second point;
wherein the first point is positioned at a first edge of the first brake pad surface being relatively proximal, in use, to the rotation axis, and the third point is positioned at a third edge of the first brake pad surface being relatively distal, in use, to the rotation axis; and
wherein the first substantially planar brake pad surface substantially occupies an area between a first terminal edge of the brake pad, proximal to the rotation axis in use, and a second terminal edge of the brake pad, distal to the rotation axis in use.

18. A method as claimed in claim 17 , wherein the first, second and third portions of the brake pad surface are provided using first, second and third materials.

19. A method as claimed in claim 18 , wherein the second material is formed by a combination of the first and third materials.

20. A method as claimed in claim 19 , wherein the brake pad is formed by blending the first and third materials between the first and third points.

21. A method as claimed in claim 20 , wherein the blending of the materials between the first and third points is such that it results in each of the first, second and third points having coefficients of friction that are related by a linear relationship.

22. A method of forming a brake pad as claimed in claim 18 , wherein the first, second and third materials are provided as layers being layered in a radial direction.

23. A brake system for a vehicle, the brake system comprising:
a brake disc having a rotation axis; and
a brake pad for braking contact with the brake disc, the brake pad comprising:
a first, substantially planar, brake pad surface having a coefficient of friction, the first substantially planar brake pad surface being removably contactable, in use, with a first radial portion of the brake disc to decrease or prevent motion of a vehicle, wherein:
at a first point on the first brake pad surface the coefficient of friction has a first v

Assignees

• Jaguar Land Rover Ltd

Inventors

• Esgandari Mohammad

Classifications

• F16D69/00

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

• F16D65/092 Primary

  for axially-engaging brakes, e.g. disc brakes · CPC title

• F16D2069/005

  having a layered structure · CPC title

• F16D2069/002

  Combination of different friction materials · CPC title

• Y10T29/49826

  Assembling or joining · CPC title