Pressure-balanced proportioning valve with vent-controlled bypas

Details Pressure-balanced proportioning valve with vent-controlled bypas Pressure-balanced proportioning valve with vent-controlled bypas

1988-11-21

1990-03-13

Garrett, Robert E.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 975, 60591, B60T 826

Patent

active

049085220

ABSTRACT:
A proportioning valve (40) is disposed within a stepped bore (13) of a master cylinder (10). The proportioning valve (40) defines with the stepped bore (13) a primary pressure receiving chamber (26) and a secondary pressure receiving chamber (28). The proportioning valve (40) includes a two-part piston (58) which includes a primary piston part (52) and a secondary piston part (54) coupled together by a lost motion coupling (53, 55). The piston parts (52, 54) are biased apart by a spring (78), and a sleeve (43) is disposed about the two-part piston (50). Seals (46, 47, 69) are disposed about the primary piston part (52), sleeve (43) and secondary piston part (54) to define an intermediate vented chamber (90), wherein a vent (19) communicates with a reservoir. Pressure failure within the primary receiving chamber (26) causes the primary piston part (52) to be displaced and close off the vent (19 ) so that fluid pressure is trapped within the intermedaite chamber (90) to prevent the secondary piston part (54) from effecting the metering of fluid flow through an outlet (21).

REFERENCES:
patent: 3597014 (1971-08-01), Stokes
patent: 3945686 (1976-03-01), Orzel
patent: 4815292 (1989-03-01), Gaiser et al.
patent: 4821519 (1989-04-01), Gaiser et al.

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