Dual-circuit master cylinder having auxiliary piston and yoke with equalization chambers for hydraulic equalization
AssigneeITT Industries, Inc.
InventorDerek R. Lowe
Life of this patent
Estimating the term…
Abstract
A dual-circuit master cylinder having hydraulic equalization is disclosed including a casing having two parallel bores and elongated pistons defining two power chambers in the casing connected to wheel brakes, a yoke including two blind bores receiving extending portion of the pistons defining two equalization chambers, an auxiliary piston operatively connected to the yoke, and a brake actuating member defining an auxiliary chamber connected to a supply reservoir via a check valve for supplying equal pressurized fluid to the equalization chambers upon movement of the auxiliary piston and yoke to displace the power pistons.
Claims6
A dual-circuit master cylinder for use in a hydraulic brake system of an automotive vehicle comprising:
- a casing including three parallel bores, each closed on one end, two of said bores each including an outlet pressure connection communicating therewith proximate said closed ends, a third of said bores including an inlet duct communicating therewith at said closed end;
- a normally open check valve associated with said duct;
- two power pistons, each slidably received in a respective one of said two bores defining two power chambers, each of said power pistons having a portion thereof extending from said respective bore externally of said casing;
- an auxiliary piston slidably received in said third bore defining an auxiliary chamber and having a portion thereof extending from said third bore externally of said casing and including means for being operatively connected to a brake actuator of said brake system;
- a yoke affixed coaxially to said auxiliary piston for axial movement therewith at a position along the external portion of said auxiliary piston such that said yoke is axially spaced apart from said casing, said yoke including two cylindrical bores, each coaxially aligned with a respective one of said two bores in said casing and having a closed end and an open end said open end facing said casing;
- the portion of each of said two pistons extending from said respective bore of said casing being slidably received in a respective one of said two cylindrical bores in said yoke defining two equalizing chambers in said yoke;
- and
- a passage in said auxiliary piston and said yoke connecting said auxiliary chamber to each of said two equalizing chambers.
Dependencies are inferred from the claim text.