Fluid handling – Systems – Multi-way valve unit
Patent
1988-10-03
1989-05-09
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
60384, 91467, F15B 1304
Patent
active
048279781
ABSTRACT:
A fluid controller (15) is disclosed for controlling the flow of fluid to fluid pressure operated devices such as a vehicle steering cylinder (17). The controller is of the type including a valve spool (35) and a valve sleeve (37) in which the various ports, passages and fluid paths are non-symmetrical. Metered, pressurized fluid is communicated through axial slots (85) in the valve spool and is communicated through cylinder ports (73) for a right turn condition, or through cylinder ports (75) for a left turn condition. The right turn cylinder ports (73) are located further axially than are the left turn cylinder ports (75) from the end of the spool and sleeve which communicate with the return port. As a result, metered, pressurized fluid has a longer leakage path for a right turn than for a left turn. In accordance with the invention, the timing of the variable return flow control orifice (A5-R) is advanced, relative to the timing of the variable return flow control orifice (A5-L) to compensate for the unequal leakage paths in the right and left turn conditions, thereby substantially eliminating steering wheel precession.
REFERENCES:
patent: 4037620 (1977-07-01), Johnson
patent: 4212229 (1980-07-01), Johnson
Eaton Corporation
Kasper L. J.
Michalsky Gerald A.
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