Claims
- 1. A brake shoe for a disc brake, said brake shoe having a back plate and a generally planar lining having an inner face affixed against said back plate, and an outer face facing away from said backplate, said outer face defining a plane parallel to said back plate, said lining having radially lateral extending edges and circumferentially extending inner and outer edges, said lining chamfered along at least one of said radially lateral or circumferential edges of said lining;
- said chamfer forming an inclined profile extending from said outer face to said at least one edge of said lining, said profile having a varying, non linear shape more steeply angled into said plane defined by said outer face of said lining adjacent said outer face than adjacent said at least one edge, whereby said chamfer shape causes the height of lining wear per braking action to rapidly decrease with successive braking actions.
- 2. A brake shoe as claimed in claim 1, wherein said shape of said profile of said chamfer follows a hyperbolic curve.
- 3. A brake shoe as claimed in claim 2, wherein said at least one chamfered edge of said lining comprises one of said circumferentially extending edges, and wherein said shape of said profile of said chamfer follows the equation; ##EQU3## in which: X.sub.n =the length of the surface of said lining existing at any moment as measured along the center plane of said lining in a tangential direction,
- X.sub.1 =the total length of the said lining in a tangential direction,
- D=the total thickness of said lining prior to any wear as measured from said inner face of said lining, adjacent said back plate,
- Y.sub.n =the height of said lining at any moment,
- n=the number of braking actions carried out, and
- K=constant characteristic of said lining, as an index of wear, in which:
- K.gtoreq.0.
- 4. A brake shoe as claimed in claim 1 wherein said lining lateral edges, and wherein said shape of said profile of said chamfer follows the equation: ##EQU4## in which: Y.sub.n =the height of said lining at any moment,
- D=the total thickness of said lining prior to any wear as measured from said inner face of said lining, adjacent said back plate,
- Y.sub.1 =the total height of the lining prior to any wear,
- Z.sub.n =the radial width of said lining at any moment,
- n=the number of braking actions carried out, and
- K=constant characteristic of said lining, as an index of wear, in which:
- K.gtoreq.0.
- 5. A brake shoe as claimed in claim 3, wherein said at least one chamfered edge of said lining comprises said outer edge of said brake shoe lining.
- 6. A brake shoe as claimed in claim 3, wherein said lining lateral edges are also chamfered.
- 7. A disc brake shoe comprising a back plate, and a generally planar brake lining of a predetertermined thickness having an inner face mounted to said back plate, and an outer face facing away from said back plate, said outer face defining a plane parallel to said back plate, said lining having inner and outer radially spaced curved circumferential edges and radially extending lateral edges extending between said inner and outer circumferential edges, a chamfer extending about at least one of said lining edges, said chamfer extending partially across the thickness of said lining from said outer face of said lining to said edge of said lining, said chamfer having a profile shape in which the chamfer is much more steeply contoured into said plane defined by said outer face of said lining in regions thereof adjacent said outer face than in regions adjacent said lining edge, whereby increments of thickness worn away with each brake application greatly decrease with successive brake applications.
- 8. The brake shoe according to claim 7, wherein said chamfer profile shape is a non-linear curve.
- 9. The brake shoe according to claim 8 wherein said chamfer profile shape is exponential.
- 10. The brake shoe according to claim 9 wherein said chamfer profile shape comprises a hyperbolic curve.
- 11. The brake shoe according to claim 9 wherein said chamfer extends about the outer circumferential edge and the lateral edges of said lining.
Priority Claims (1)
Number |
Date |
Country |
Kind |
40 06 369.0 |
Mar 1990 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 07/934,616, filed on Sep. 1, 1992, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5145037 |
Kobayashi et al. |
Sep 1992 |
|
Foreign Referenced Citations (7)
Number |
Date |
Country |
2312690 |
Dec 1976 |
FRX |
2331476 |
Jun 1977 |
FRX |
2712049 |
Sep 1977 |
DEX |
2314135 |
Oct 1978 |
DEX |
2919537 |
Feb 1980 |
DEX |
5139531 |
Oct 1980 |
JPX |
1239014 |
Jun 1986 |
SUX |
Continuations (1)
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Number |
Date |
Country |
Parent |
934616 |
Sep 1992 |
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