Kelsey-hayes Company

John M Cassidy

Joseph A Starr

Ronald L Sorensen

Gary R Knight

Patrick J Tardiff

Brian Maloney

Jeffrey King

A hydraulic control unit (HCU) for a vehicle brake system having an HCU body and an accumulator mounted in the HCU body. A grommet is provided for mounting the HCU body to a vehicle body and resiliently separating the HCU body from the vehicle body. The grommet defines a vent path for the accumulator and includes a hollow generally cylindrical shaft. The shaft has a closed end and an open end, and the closed end has an opening therethrough. An enlarged annular head is formed on the open end of the shaft and has an inner surface defining an axial bore therethrough. The axial bore is in fluid communication with the hollow shaft, the annular head further has a crown cut geometry providing radially extending grooves within an axial face of the annular head, the radially extending grooves being in fluid communication with the axial bore of the annular head.

Fluid accumulator for use in a vehicle anti-lock brake system

A fluid compensator is provided in a hydraulic control unit of vehicular brake system. The fluid compensator permits additional displacement of a master cylinder piston during anti-lock braking events only by storing fluid in the hydraulic control unit. The additional displacement moves a seal mounted on the master cylinder piston away from a compensator port orifice, thereby preventing repeated &ldquo;nibbling&rdquo; of the seal which can cause premature seal failure.

Hydraulic control unit with fluid compensator to accommodate travel of master cylinder piston

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Farmington Hills, MI, United States of America

John M Cassidy