Displacement control valve

Details Displacement control valve Displacement control valve

1991-08-19

1993-04-27

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Bias-type input and feedback signal means

60444, 60487, 91505, F15B 1316, F16D 3900

Patent

active

052052010

ABSTRACT:
A displacement control valve has a valve body with a fluid metering valve spool axially movable between pilot pressure chambers formed at opposite ends of an interior bore in the valve body. An internal spring feedback apparatus is mounted on the valve spool in one of the pilot pressure chambers and elastically interconnects the swashplate of a variable displacement hydraulic unit with the valve spool. An elongated housing surrounds the spring and spring guides and is mechanically coupled with the swashplate. The housing and spring guides form a fluid seal between the valve spool and the valve body to seal the pilot pressure chamber in which the feedback apparatus is mounted.

REFERENCES:
patent: 3750406 (1973-08-01), Verlinde et al.
patent: 3817033 (1974-06-01), Appel et al.
patent: 3854847 (1974-12-01), Schlecht
patent: 3901031 (1975-08-01), Knapp et al.
patent: 4285358 (1981-08-01), Haydt
patent: 4395878 (1983-08-01), Morita et al.
patent: 4476680 (1984-10-01), Pollman et al.
patent: 4920748 (1990-05-01), Kordak et al.

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