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A hydraulic four-wheel drive apparatus for driving by a hydraulic motor four wheels: steering wheels and driving wheels, in which the steering wheels are driven by a variable capacity motor for the steering wheels and a front differential gear unit, and the driving wheels are driven by a fixed capac

A hydraulic four-wheel drive apparatus for driving by a hydraulic motor four wheels: steering wheels and driving wheels, in which the steering wheels are driven by a variable capacity motor for the steering wheels and a front differential gear unit, and the driving wheels are driven by a fixed capacity motor for the driving wheels, so that, when a vehicle turns, a swash plate of the variable capacity motor associates with operation of a steering handle, thereby accelerating the speeds of steering wheels.

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A hydraulic drive system for a vehicle having at least one driving wheel and at least one steering wheel, comprising: a variable capacity motor including a swash plate and a motor shaft; a steering handle connected to said swash plate; a steering wheel differential gear driven by said motor shaft fo

A hydraulic drive system for a vehicle having at least one driving wheel and at least one steering wheel, comprising: a variable capacity motor including a swash plate and a motor shaft; a steering handle connected to said swash plate; a steering wheel differential gear driven by said motor shaft for driving the steering wheel of said vehicle; a fixed capacity motor; a driving wheel differential connected to said fixed capacity motor for driving the driving wheel of said vehicle; a hydraulic supply means, said hydraulic supply means comprising a variable capacity pump connected to an engine, wherein said hydraulic supply means connects said variable capacity motor with said capacity motor; said swash plate, in association with said steering handle, varies the rotation of said motor shaft, when said steering handle is turned, said steering wheel changes speed corresponding to a turning radius of said steering handle.