Abstract: The present invention relates to a spring-constant variable type stabilizer device for a vehicle, the device comprising a stabilizer provided between left and right wheels of the vehicle and a control cylinder arranged between the stabilizer and a lower arm, wherein spring constant of the stabilizer is variably adjusted by controlling the control cylinder. An oil port of an oil passage in communication with a reservoir chamber in a position assuming a neutral position of a piston stroke region is formed in a cylinder body of the control cylinder, a piston within the cylinder body is always biased from both directions thereof by means of a pair of springs, and a locked state of the control cylinder is promptly attained always in a complete neutral position.

Abstract: This height adjustment system includes: a source of pressurized working fluid; several fluid pressure actuated wheel suspension units, each of which resiliently pushes a one of the wheels of the vehicle downwards with respect to the body thereof, according to the amount of pressurized working fluid supplied to it; a passage means for conducting supply of working fluid from the source to the wheel suspension units; several valve means, provided at intermediate points of the passage means, for controlling flow of working fluid therethrough; and a flow divider means which has an inlet and two outlets, one of the outlets being communicated to a first set of the wheel suspension units for a first set of the wheels of the vehicle and the other of the outlets being communicated to a second disjoint set of the wheel suspension units for a second disjoint set of the wheels of the vehicle.