Fluid-pressure and analogous brake systems – With pump
Patent
1985-06-20
1987-02-10
Butler, Douglas C.
Fluid-pressure and analogous brake systems
With pump
188345, 188347, 303 56, 303114, 303119, B60T 802, B60T 1116, B60T 1312
Patent
active
046418911
ABSTRACT:
A hydraulic servo vehicle brake with a tandem master cylinder wherein the first master piston (24) is provided with a cylindrical axial bore toward the piston pressure chamber (76). A second master piston (80) extending to the master cylinder bottom (79) is tightly slidably arranged in the axial bore. A non-return valve (23) provided as a sealing cup is provided between the second master piston (80) and the annular portion (24"') of the first master piston (24). Between that portion of the second master piston (80) which projects from the axial bore (78) and the master cylinder (11), an annular chamber (22) is provided which is linked with a three-position two-way valve (33) controlled by the controlled pressure. With no application of controlled pressure, the three-position two-way valve (33) links the annular chamber (22) to the fluid reservoir (27). In the presence of a slight controlled pressure, the valve (33) interrupts the link. Above a certain level of controlled pressure, the valve ( 33) opens again and re-establishes the link to the fluid reservoir (27).
REFERENCES:
patent: 4225022 (1980-09-01), Belart
patent: 4251114 (1981-02-01), Belart
patent: 4440454 (1984-04-01), Belart et al.
patent: 4467605 (1984-08-01), Smith
Alfred Teves GmbH
Butler Douglas C.
Michals William J.
Raden James B.
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