Hydraulic brake booster including a tracking valve
AssigneeRobert Bosch GmbH
InventorHeinz Leiber
Life of this patent
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Abstract
A hydraulic brake booster is proposed, in which a coupling is provided between a control valve and a booster piston. The coupling engages the control valve at a slide sheath and upon the movement of the booster piston causes it to move as well, in such a manner that tracking control is provided. A pedal push rod in this manner always keeps a certain distance from the booster piston; that is, it does not touch it. However, if the auxiliary force should fail, then the pedal push rod does touch the booster piston, and its force is transmitted mechanically.
Claims4
A hydraulic brake booster for motor vehicles having a housing (5), a booster chamber in said housing, a control valve (10) in said housing disposed at least generally parallel to and beside said booster chamber for monitoring a pressure connection of said booster chamber with said control valve, said booster chamber is defined by a booster piston (8) which is disposed at least generally in axial alignment with a pedal push rod to control a brake circuit fluid pressure, said control valve (10) further comprising a slide (12) and a coaxial relatively movable slide sheath (11), a one piece coupling lever (31) in said housing operatively positioned for a non-pivotable fixed connection between said booster piston (8) and said slide sheath (11) for coupling said booster piston with said slide sheath for movement of said slide sheath by said booster piston in a braking and brake-actuating direction for both a translation and a tracking control between said control valve (10) and said booster piston (8).
Dependencies are inferred from the claim text.