Patent ID: 7798498

Claim:
A stabilizer system for a vehicle, comprising: (a) a stabilizer bar including (a-1) a torsion bar portion, and (a-2) an arm portion that extends in a direction not parallel to said torsion bar portion, from said torsion bar portion toward a wheel of the vehicle; and (b) an actuator including (b-1) a motor, and (b-2) a speed reducer that reduces a speed of said motor while transmitting a force of said motor to said torsion bar portion of said stabilizer bar, wherein said stabilizer bar generates a stabilizing force which is dependent on a reaction that is generated as a result of torsion of said torsion bar portion, and which forces the wheel and the body of the vehicle in a selected one of a direction toward each other and a direction away from each other, wherein said actuator allows said stabilizer bar to generate the stabilizing force whose magnitude is dependent on a magnitude of the force of said motor and is changeable depending on an amount of rotation of said torsion bar portion, and wherein said actuator includes an actuator-efficiency changing mechanism changing a negative efficiency of said actuator, depending on a direction of the force of said motor, said reverse efficiency corresponding to a ratio of the magnitude of the force of said motor minimally required to inhibit said motor from being moved by an external force that acts on said stabilizer bar, to an magnitude of the external force.