Piston with improved displacement properties
First Claim
Patent Images
1. A brake pad actuating device comprising:
- a) a piston including;
i) a first pocket;
ii) an opposing second pocket; and
iii) an internal wall located in the piston separating the first pocket and the second pocket,wherein a volume of the first pocket to a volume of the second pocket form a ratio of about 10;
1 or less; and
wherein the piston is made of a moldable plastic material that does not dissolve in brake fluid, and the piston is adapted to be used as a brake piston; and
wherein a depth of the first pocket and a depth of the second pocket form a ratio of between about 1.2;
1 and about 1;
1.2 and a wall thickness of the internal wall between about 5 mm and 14 mm.
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Accused Products
Abstract
A brake pad actuating device comprising: a piston including: a first pocket; an opposing second pocket; and an internal wall located in the piston separating the first pocket and the second pocket, wherein the volume of the first pocket to the volume of the second pocket form a ratio of less than about 20:1; and wherein the piston is adapted to be used as a brake piston.
19 Citations
18 Claims
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1. A brake pad actuating device comprising:
a) a piston including; i) a first pocket; ii) an opposing second pocket; and iii) an internal wall located in the piston separating the first pocket and the second pocket, wherein a volume of the first pocket to a volume of the second pocket form a ratio of about 10;
1 or less; andwherein the piston is made of a moldable plastic material that does not dissolve in brake fluid, and the piston is adapted to be used as a brake piston; and wherein a depth of the first pocket and a depth of the second pocket form a ratio of between about 1.2;
1 and about 1;
1.2 and a wall thickness of the internal wall between about 5 mm and 14 mm.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A brake pad actuating device comprising:
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a) a cylindrical piston adapted for use as a brake piston, the cylindrical piston consisting essentially of; i) a first pocket; ii) an opposing second pocket; iii) an internal wall located in the piston separating the first pocket and the second pocket; and iv) an annular boot groove located in the cylindrical piston adjacent to the first pocket; b) a piston bore that houses the piston, the piston bore including a seal groove; wherein a volume of the first pocket to a volume of the second pocket form a ratio of about 1.5;
1 or less;wherein the internal wall is located between the first pocket and the second pocket so that a depth of both the first pocket and the second pocket are substantially the same; wherein the cylindrical piston is made of a moldable plastic material that does not dissolve in brake fluid, and the cylindrical piston is sufficiently rigid to withstand fluid pressure that pushes the cylindrical piston into contact with an inboard brake pad; wherein brake fluid fills the second pocket and surrounds the second pocket of the cylindrical piston so that equal amounts of force, in a radial direction, are exerted on an inside of the second pocket of the cylindrical piston and an outside of the second pocket of the cylindrical piston; and wherein the moldable plastic material has a post-baked flexural strength of about 85 or more measured using ASTM D 790.
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Specification