Fluid control valve for a hydraulic system operating with variab

Details Fluid control valve for a hydraulic system operating with variab Fluid control valve for a hydraulic system operating with variab

1994-11-07

1996-03-19

Nilson, Robert G.

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

1371163, 137468, 1376252, 13762545, 13762565, G05D 1620

Patent

active

054996503

ABSTRACT:
Problems such as slow frequency response and low reliability when operating with contaminated fluids of variable viscosity are alleviated in a low pressure hydraulic system (10) which utilizes a single stage, electro-hydraulic, clevis-type pressure control valve (40). The valve (40)includes a control piston (106) referenced to a control pressure within a control pressure cavity (60) to provide a feedback of control pressure which converts the valve (40) from an integral to a proportional control device, thereby enhancing stability of the hydraulic system (10). Compensation for changes in fluid viscosity, as a result of changes in fluid temperature, is provided by fabricating a bifurcated portion (98) and/or a metering bridge portion (62) of the valve (10) from materials having dissimilar coefficients of thermal expansion. Exemplary embodiments of a hydraulic system (10) suitable for use in either vehicular or stationary applications involving pressure actuated devices, such as a clutch (16), automatic transmissions or anti-lock brakes, are provided.

REFERENCES:
patent: 1763994 (1930-06-01), Thoma
patent: 3081787 (1963-03-01), Meuledyk
patent: 3234967 (1966-02-01), Munn
patent: 3583430 (1971-06-01), Toennesen
patent: 3805835 (1974-04-01), Jansen
patent: 4046061 (1977-09-01), Stokes
patent: 4071042 (1978-01-01), Lombard
patent: 4773439 (1988-09-01), Coates-Smith
patent: 4949752 (1990-08-01), Nogle et al.

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