Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Hydraulic power steering apparatus
 A hydraulic power steering apparatus includes a pump for discharging pressurized operation fluid, a power cylinder for generating assisting force, a control valve connected to the pump via a fluid path for receiving the operation fluid from the pump and adapted to supply the operation fluid to the power cylinder in accordance with operation of a steering wheel, a rubber hose disposed in the fluid path. A check valve is disposed between the rubber hose and the control valve. Since reverse flow of the operation fluid due to input of kick-back force is prevented, tires to be steered are prevented from undesirably steered against the driver's intention. Further, a pressure relieving mechanism is provided to relieve part of the operation fluid when the check valve operates. Therefore, the oil pressure within the power cylinder and the control valve is prevented from increasing excessively, so that the oil pressure within the pump does not reach a preset relief pressure. 
Toyoda Koki Kabushiki Kaisha
B B
B62D B62D
inventional inventional
Susumu Isao Osamu Yuji
Honaga Hasegawa Watanabe Yoshizawa