Hydraulic system in working vehicles

Details Hydraulic system in working vehicles Hydraulic system in working vehicles

1986-02-10

1987-01-20

Pekar, John A.

Motor vehicles

Surface effect vehicles

Dynamic seal or fluid curtain

60422, 91516, 13762566, B62D 508

Patent

active

046374825

ABSTRACT:
In a working vehicle comprising a hydraulic power steering cylinder (25) and hydraulic lift cylinder (31), a novel hydraulic system is employed which comprises a flow control valve means (47) having an orifice (51) and relief valve (52) and arranged such that it divides output flow of a single pump (43) driven by engine (10) into a constant flow directed towards steering cylinder and a surplus flow directed towards lift cylinder. Piston (54) is particularly provided which varies, in cooperation with an orifice (55) between the pump and control valve means, the biasing force of valve spring (53) of the relief valve so as to vary the flow directed towards steering cylinder within a predetermined range in response to engine speed. The system is fashioned such that it secures a flow for a relatively quick operation of lift cylinder at a low engine speed while securing a predetermined constant flow for steering cylinder at the normal engine speeds.

REFERENCES:
patent: 4213511 (1980-07-01), Rubenstein et al.
patent: 4385674 (1983-05-01), Presley
patent: 4420934 (1983-12-01), Udono

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