Sealing and adjusting means in a disk brake
First Claim
1. Sealing means in a disk brake, in which a piston fitted in a cylinder is to urge a friction pad onto a disk rotating with a wheel of a vehicle in order to stop or to decelerate the vehicle, for maintaining the fluid tightness between said piston and said cylinder, said sealing means comprising:
- a groove substantially rectangular in section disposed circumferentially on the internal periphery of said cylinder, said groove having a forward wall;
a sealing ring substantially rectangular in section fitted in said groove and having a forward surface; and
a spring member disposed between the forward surface of said sealing ring and the forward wall of said groove for constantly biasing said sealing ring backwardly, said spring member being shaped such as to allow a predetermined amount of elastic deflection of said sealing ring due to shear forces caused by relative movement between said piston and said cylinder before causing deflection of said spring member;
wherein the coefficient of friction between said sealing ring and said cylinder is preselected to prevent sliding of said piston relative to said sealing ring until said sealing ring and said spring member have been deflected substantially up to the limit of elastic deflection thereof.
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Accused Products
Abstract
A sealing member in a disk brake, in which a piston fitted in a cylinder is to urge a friction pad onto a rotating disk, includes a sealing ring disposed in a circumferential groove provided in the cylinder or on the piston. A spring member is disposed between the forward surface of the sealing ring and the forward wall of the groove for constantly biasing the sealing ring backwardly in order to return the piston substantially to the same position when the brake is released, regardless of the magnitude of the braking pressure applied, while preserving the function of automatic compensation for the wearing of the friction pad.
24 Citations
24 Claims
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1. Sealing means in a disk brake, in which a piston fitted in a cylinder is to urge a friction pad onto a disk rotating with a wheel of a vehicle in order to stop or to decelerate the vehicle, for maintaining the fluid tightness between said piston and said cylinder, said sealing means comprising:
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a groove substantially rectangular in section disposed circumferentially on the internal periphery of said cylinder, said groove having a forward wall; a sealing ring substantially rectangular in section fitted in said groove and having a forward surface; and a spring member disposed between the forward surface of said sealing ring and the forward wall of said groove for constantly biasing said sealing ring backwardly, said spring member being shaped such as to allow a predetermined amount of elastic deflection of said sealing ring due to shear forces caused by relative movement between said piston and said cylinder before causing deflection of said spring member; wherein the coefficient of friction between said sealing ring and said cylinder is preselected to prevent sliding of said piston relative to said sealing ring until said sealing ring and said spring member have been deflected substantially up to the limit of elastic deflection thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a disk brake comprising a cylinder, a piston fitted in said cylinder, a friction pad connected to said piston, means for urging said friction pad against a rotating disk in order to decelerate or stop the disk when the brake is applied and piston retracting means for restoring said piston to the original position when the brake is released, the improvement wherein said piston retracting means comprises:
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a first spring means and a second spring means both for urging said piston into a fully retracted position and both accommodated in a recess disposed on the internal periphery of said cylinder, said first spring means abutting said cylinder with one end thereof and abutting said piston with the other end thereof, and said second spring means abutting said first spring means with one end thereof and abutting said cylinder with the other end thereof, wherein said spring means are selected such that one of said spring means begins first to elastically deflect upon motion of said piston and the other of said spring means does not begin to elastically deflect before the former has been elastically deflected to a predetermined extent. - View Dependent Claims (16)
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17. Sealing means in a disk brake, in which a piston fitted in a cylinder is to urge a friction pad onto a disk rotating with a wheel of a vehicle in order to stop or decelerate the vehicle, for maintaining the fluid tightness between said piston and said cylinder, said sealing means comprising:
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a groove substantially rectangular in section disposed circumferentially on the external periphery of said piston, said groove having a rearward wall; a sealing ring substantially rectangular in section fitted in said groove and having a rearward surface; and a spring member disposed between the rearward surface of said sealing ring and the rearward wall of said groove for constantly biasing said sealing ring forwardly, said spring member being shaped such as to allow a predetermined amount of elastic deflection of said sealing ring due to shear forces caused by relative movement between said piston and said cylinder before causing deflection of said spring member; wherein the coefficient of friction between said sealing ring and said cylinder is preselected to prevent sliding of said piston relative to said sealing ring until said sealing ring and said spring member have been deflected substantially up to the limit of elastic deflection thereof. - View Dependent Claims (18, 19, 20, 21, 22)
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23. In a disk brake comprising a cylinder, a piston fitted in said cylinder, a friction pad connected to said piston, means for urging said friction pad against a rotating disk in order to decelerate or stop the disk when the brake is applied and piston retracting means for restoring said piston to the original position when the brake is released, the improvement wherein said piston retracting means comprises:
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a first spring means and a second spring means both for urging said piston into a fully retracted position and both accommodated in a recess disposed on the external periphery of said piston, said first spring means abutting said piston with one end thereof and abutting said cylinder with the other end thereof, and said second spring means abutting said first spring means with one end thereof and abutting said piston with the other end thereof, wherein said spring means are selected such that one of said spring means begins first to elastically deflect upon motion of said piston and the other of said spring means does not begin to elastically deflect before the former has been elastically deflected to a predetermined extent. - View Dependent Claims (24)
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Specification