Method and apparatus for selective supplementary hydraulic...

Details Method and apparatus for selective supplementary hydraulic... Method and apparatus for selective supplementary hydraulic...

F - Mech Eng,Light,Heat,Weapons

15

B

180/39, 138/52

F15B 7/00 (2006.01) B60K 17/10 (2006.01) B60K 17/356 (2006.01)

Patent

CA 1239331

ABSTRACT OF THE DISCLOSURE The present invention relates to a method for selective hydraulic driving of the wheels of a vehicle, supplementary to the main driving wheels driven by an engine through a torque converter or a gearbox, by automated control of a closed hydraulic operating circuit, with wheel motors fed from a variable capacity pump, and a variable capacity pump and a control pump driven directly by the engine, the flow and pressure of the working fluid being controlled by the controllable control pump flow, and, in superim- position of the working fluid flow control, the working fluid pressure is controlled by the pattern of a predeter- mined function selectable in dependence upon the ratio between the output r.p.m. of the engine and the output r.p.m. of the converter stages or the gearbox.

462389

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