Hydraulic control arrangement for actuating lifting mechanism of

Details Hydraulic control arrangement for actuating lifting mechanism of Hydraulic control arrangement for actuating lifting mechanism of

1982-09-27

1985-04-30

Stouffer, Richard T.

Earth working

Automatic power control

Draft responsive

A01B 63112

Patent

active

045138265

ABSTRACT:
A hydraulic control arrangement for actuating a lifting mechanism of an agricultural machine has a hydraulic motor arranged to lift and lower at least one member of a lifting mechanism, a hydraulic pressure medium source, a directional control valve arranged to control the hydraulic motor, a structural element having a bending elasticity arranged so that forces transmitted from the lifting mechanism member in a machine housing are at least partially transmitted via the structural element and the latter is bent, and a hydromechanical transformer having two parts movable relative to one another and a hydraulic control circuit for controlling the directional control valve and arranged so that bending of the structural element is used by the transformer as an adjusting member, wherein the structural element is directly formed as these parts movable relative to one another and influencing in a pressure medium streams through the transformer, and the parts include a first part which is hollow, has bending elasticity and is exposed to the bending forces, and a second part which does not have bending elasticity, is not exposed to the bending forces and is received in the first part, and the second part is fixedly connected in at least one point with the first part and has a free end which is spaced from this point and forms an adjustable throttling point of the transformer.

REFERENCES:
patent: 4145956 (1979-03-01), Rumrill, Jr. et al.
patent: 4293040 (1981-10-01), O'Connor

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