Closed-center controller for use with unequal area cylinder

Details Closed-center controller for use with unequal area cylinder Closed-center controller for use with unequal area cylinder

1985-06-27

1985-12-17

Schwadron, Martin P.

Fluid handling

Systems

Multi-way valve unit

137312, 13759613, 13762521, 91375A, 91467, 60384, 60494, 418 61B, B62D 508

Patent

active

045587205

ABSTRACT:
A closed-center, non load-sensing controller (15) is disclosed for use with an unequal area steering cylinder (17). The controller includes valving comprising a spool (35) and sleeve (37). The sleeve includes an annular groove (65) in communication with the inlet port (29) and cylinder ports (73,75) in communication with the opposite ends of the steering cylinder. The sleeve defines an annular leakage groove (95) which is disposed to interrupt the flow of leakage fluid from the annular groove (65) to the cylinder ports (73,75), to eliminate undesired piston rod extension. When the valving is in neutral, leakage fluid collected in the annular groove (95) is communicated through radial bore (97), axial slots (83), and annular groove (81), axial slots (91), drain bore (99), drain bore (93), and then to the system reservoir.

REFERENCES:
patent: 4096883 (1978-06-01), Yip
patent: 4159723 (1979-07-01), Baatrup et al.
patent: 4167893 (1979-09-01), Johnson
patent: 4311171 (1982-01-01), Roberts

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