Hydraulic boosters for vehicle braking systems

Details Hydraulic boosters for vehicle braking systems Hydraulic boosters for vehicle braking systems

1982-04-12

1984-04-24

Reger, Duane A.

Fluid-pressure and analogous brake systems

Motorman's valves

60548, B60T 1314

Patent

active

044444400

ABSTRACT:
An hydraulic booster has a housing provided with an input member, a boost piston, an output member, and connections to a source of pressure and a fluid reservoir. A force applied to the input member is transmitted to the output member and augmented by the boost piston in response to pressurization of a boost chamber controlled by a valve mechanism in response to operation of the input member. An auxiliary chamber is defined between the boost piston and the output member. In a first stage of operation to take up lost-motion in the system, the auxiliary chamber is supplied with fluid from the source to advance the output member relative to the boost piston through a distance determined by a limiting mechanism. In a second stage of operation the output member and the boost piston move together in response to pressurization of the boost chamber. The area of the boost piston on which the auxiliary pressure acts is greater than or equal to the effective area of the boost piston.

REFERENCES:
patent: 3879948 (1975-04-01), Flory
patent: 4181371 (1980-01-01), Adachi

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