Fluid controller with improved pressure balancing

Details Fluid controller with improved pressure balancing Fluid controller with improved pressure balancing

1988-06-09

1989-02-14

Rivell, John

Fluid handling

Systems

Multi-way valve unit

60384, 251283, B62D 508, F16K 3900

Patent

active

048040169

ABSTRACT:
A fluid controller (15) is provided of the type for directing pressurized fluid from a source (13) to a steering cylinder (17). The controller includes a housing defining right and left turn ports (32 and 34) and corresponding annular grooves (32g and 34g). The controller valving includes a cylindrical sleeve (37) and a spool (35). Steering against the cylinder stops results in trapped pressurized fluid in one of the annular grooves (32g or 34g) after the valving returns to the neutral position. The sleeve (37) is provided with pressure balancing passages (93 and 97) which are positioned to communicate trapped pressurized fluid into pressure balancing areas (85 or 99, respectively). The pressurized fluid in the balancing areas is able to counteract the clamping force on the sleeve resulting from the trapped fluid in one of the annular grooves (32g or 34g), and thereby prevent a subsequent stiction condition when the vehicle operator attempts to begin the next steering maneuver.

REFERENCES:
patent: 3425448 (1969-02-01), Peterson
patent: 4016949 (1977-04-01), Plate et al.
patent: 4037620 (1977-07-01), Johnson
patent: 4096883 (1978-06-01), Yip
patent: 4159723 (1979-07-01), Bartrup et al.
patent: 4177834 (1979-12-01), Bonney
patent: 4311171 (1982-01-01), Roberts
patent: 4336687 (1982-06-01), Morgan
patent: 4495769 (1985-01-01), Tischer et al.
patent: 4558720 (1985-12-01), Larson et al.
patent: 4620416 (1986-11-01), Yip et al.
patent: 4730544 (1988-03-01), Jorgensen

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