Hydraulic four-wheel driving articulated vehicle

Details Hydraulic four-wheel driving articulated vehicle Hydraulic four-wheel driving articulated vehicle

2008-06-24

2008-06-24

Morris, Lesley D. (Department: 3611)

Motor vehicles

Steering gear

With fluid power assist

C180S414000, C180S235000, C180S242000

Reexamination Certificate

active

07389847

ABSTRACT:
A hydraulic four-wheel driving articulated vehicle comprises: a first frame, on which first axles and a first hydraulic motor driving the first axles are mounted; a second frame, on which second axles and a second hydraulic motor driving the second axles are mounted, wherein the first and second frames are connected to each other so as to be relatively rotatable centering on a vertical axis by a steering operation; a hydraulic pump; a hydraulic circuit fluidly connecting the first and second hydraulic motors in series to the hydraulic pump, wherein the hydraulic circuit includes a passage interposed between the first and second hydraulic motors; and pressure control means for releasing oil from the passage between the first and second hydraulic motors when the first and second frames are relatively rotated by the steering operation of the stationary vehicle and backpressure oil discharged from the first and second hydraulic motors is excessively accumulated in the passage between the first and second hydraulic motors.

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