To cause a turning radius to be smaller than a turning radius when a vehicle is turned to its maximum degree without changing a structure of the vehicle body by a method wherein a brake for a wheel inside a turning range during a steering operation is braked and a rotating speed difference between the inner wheel and the outer wheel is arranged so as to cause the turning outer wheel to be turned more fast than the inner wheel.
A turning radius instruction means 14 is turned ON, and a turning radius instruction value selected from a plurality of turning radius instruction values is outputted to a control means 16 as a set speed ratio. A calculating means contained in the control means 16 calculates a speed ratio which is a ratio between a rotating speed of the outer turning wheel and the inner turning wheel in response to rotational speeds detected by wheel shaft rotating speed sensing means 52a, 52b or the like. In the case that this speed ratio is smaller than the set speed ratio, the turning radius is larger than a set turning radius, resulting in that a pressure increasing signal is outputted to a pressure setting means 86 in order to reduce the rotation of the inner turning wheel and then an output pressure of the inner turning wheel shaft brake in each of the brake hydraulic control valves 64a, 64b or the like is increased.
KATANO MUNEO
YAMANAKA MANABU
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