Patent ID: 8109371

Claim:
A damper comprising: an actuator connected to a sprung member side of a vehicle, said actuator including a motion converting mechanism for transforming a linear motion into a rotational motion and a motor to which the rotational motion resulting from the transformation by the motion converting mechanism is transmitted; a hydraulic damper, said hydraulic damper including a cylinder, a piston inserted slidably into said cylinder and defining two pressure chambers within the cylinder, and a rod connected at one end thereof to said piston, wherein a linear motion of said actuator being transmitted to one of said rod and said cylinder, the other of said rod and said cylinder being connected to an unsprung member side of the vehicle; and biasing means being able to bias said hydraulic damper in both hydraulic damper compressing direction and hydraulic damper extending direction, said biasing means including a pair of spring seat portions immovable axially with respect to the other of said rod and said cylinder and juxtaposed axially of said cylinder, a spring seat immovable axially with respect to one of said rod and said cylinder and disposed between said spring seat portions, and a pair of springs interposed in two positions respectively between said spring seat portions and said spring seat.