Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1996-07-11
1998-10-13
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13711511, 137906, B62D 506
Patent
active
058197788
ABSTRACT:
In a power steering system which has a fluid pump and a hydraulic actuator, there is used a flow control device which comprises a spool unit slidably received in a spool receiving bore in a manner to partition the bore into first and second pressure chambers. The spool unit comprises a hollow cylindrical outer spool slidably received in the spool receiving bore. The outer spool has a bottom portion exposed to the second pressure chamber. The bottom portion has an aperture formed therethrough. A cylindrical inner spool is incorporated with the outer spool. The inner spool includes a larger diameter portion slidably received in a major part of the outer spool and a smaller diameter portion slidably received in the aperture of the bottom portion of the outer spool. The inner spool is engaged with a control spring to be biased toward the first pressure chamber. A spring member is employed for biasing the outer and inner spools toward the second and first pressure chambers respectively.
REFERENCES:
patent: 2500627 (1950-03-01), Chinn
patent: 2748711 (1956-06-01), Drude
patent: 3384020 (1968-05-01), Searle
patent: 4361166 (1982-11-01), Honaga et al.
patent: 4505293 (1985-03-01), Strange
patent: 5706849 (1998-01-01), Uchida et al.
Saita Norihiro
Uchida Yukio
Hepperle Stephen M.
Unisia Jecs Corporation
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