Brake cylinder-piston slave unit seal having radial roll-back protrusion for piston spring back retract
First Claim
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1. A piston-cylinder assembly for a wheel brake unit of a hydraulic brake system of an automotive vehicle comprising:
- a ceramic piston received in a cylinder of said wheel brake unit with radial clearance between said cylinder and said piston, said piston movable between a brake released position and a braked position in response to hydraulic pressure on said piston;
a seal on said piston at an end thereof exposed to said hydraulic pressure in said cylinder including a sealing lip extending at an acute angle outwardly from said piston into sliding sealing engagement with said cylinder, said seal further including roll-back means engaging said cylinder for substantially returning said piston to said brake released position upon reduction of said hydraulic pressure.
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Abstract
In a piston-cylinder assembly for hydraulic brake systems of automotive vehicles, the piston is at least partially composed of ceramics. A hydraulic seal is interposed between the piston and the cylinder. To simplify the assembly while allowing comparatively great tolerances, the seal is fitted at the end of the piston that is adapted to be mounted close to a pressure chamber within the system. The seal is provided with radially-extending projections which cause the piston to spring back by a roll-back effect.
49 Citations
23 Claims
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1. A piston-cylinder assembly for a wheel brake unit of a hydraulic brake system of an automotive vehicle comprising:
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a ceramic piston received in a cylinder of said wheel brake unit with radial clearance between said cylinder and said piston, said piston movable between a brake released position and a braked position in response to hydraulic pressure on said piston; a seal on said piston at an end thereof exposed to said hydraulic pressure in said cylinder including a sealing lip extending at an acute angle outwardly from said piston into sliding sealing engagement with said cylinder, said seal further including roll-back means engaging said cylinder for substantially returning said piston to said brake released position upon reduction of said hydraulic pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification