Hydraulic brake booster

Details Hydraulic brake booster Hydraulic brake booster

B - Operations, Transporting

60

T

303/70

B60T 15/02 (2006.01) B60T 13/16 (2006.01)

Patent

CA 1072152

SPOOL VALVE FOR HYDRAULIC BRAKE BOOSTER ABSTRACT OF THE DISCLOSURE A hydraulic brake booster includes a spool valve within a housing for communicating fluid pressure into a chamber for urging a piston in a direction actuating a master cylinder, thereby effecting a brake application. The communication between an inlet passage and the chamber is regulated by a land on the spool valve cooperating with a corresponding land on the housing. In order to prevent particles which are carried in the pressur- ized fluid from wedging in the interface between the land and the corres- ponding housing land, an additional land is provided on the spool valve. The additional land cooperates with another land on the housing to form a small clearance therebetween so that large particles in the fluid are pre- vented from wedging in the interface between the sensitive land and the corres- ponding land on the housing when the valve is in the brake-released position.

282609

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