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US 6,550,598 B2Granted
Electric park brake
AssigneeDelphi Technologies, Inc.
InventorDavid B. Drennen
Life of this patent
Estimating the term…
Abstract
A brake apparatus for a vehicle includes a housing including a bore formed therein. A piston is slidably positioned in the bore, the piston and bore defining a fluid chamber therebetween. A screw member is operatively engaged with the piston. The piston and screw member are movable based on fluid pressure in the fluid chamber and movable in a linear direction based on the rotational movement of the screw member.
Claims14
A brake apparatus comprising:
- a housing including a bore formed therein;
- a piston slidably positioned in the bore, the piston and bore defining a fluid chamber therebetween;
- and
- a screw member operably engaged with the piston, wherein the piston and screw member are movable based on fluid pressure in the fluid chamber and wherein the piston is movable in a linear direction based on the rotational movement of the screw member.
1 more element
A method of applying an electric park brake for a hydraulic apply brake system comprising:
- rotating a screw member engaged with a piston;
- and
- linearly advancing the piston into contact with a brake pad responsive to the rotation of the screw member,
- wherein the screw member includes a first helically, shaped groove formed into an outer surface of the screw member, and the piston includes a second helically shaped groove formed into an inner surface of the piston, the first and second grooves positioned to engage a plurality of rolling elements disposed there between.
1 more element
A brake apparatus comprising:
- means for rotating a screw member operatively engaged with a piston;
- and
- means for linearly advancing the piston into contact with a brake pad responsive to the rotation of the screw member,
- wherein the screw member includes a first helically shaped groove formed into an outer surface of the screw member, and the piston includes a second helically shaped groove formed into an inner surface of the piston, the first and second grooves positioned to engage a plurality of rolling elements disposed therebetween.
1 more element
Dependencies are inferred from the claim text.