| 摘要 |
PURPOSE:To improve a direct feeling by providing a reaction force control means that controls pressure actuated on the pressure chamber of a reaction force mechanism based on the signals of a handle steering angle in addition to the control of the steering power that corresponds to the car speed. CONSTITUTION:A power steering device is provided with a servo valve 30 that controls the supply and exhaust of pressurized oil into a power cylinder according to the relative rotation between an input shaft 23 as the steering shaft and an output shaft 21 as the pinion shaft 23 as the steering shaft and an output shaft 21 as the pinion shaft 23 as the steering shaft and an output shaft 21 as the pinion shaft. In addition, the device is provided with a reaction force mechanism including a moving plunger 54 in the radial direction, that introduces the pressurized oil exhausted from a supply pump 60 and passing through first and second flowrate control valves 61 and 65 operated so as to constantly keep the pressure before and behind metering orifices 62 and 66, from an introduction port 58 and is varied into the handle torque corresponding to the car speed and such. In this case, the introduction port 58 can be connected to a reservoir through a pressure control valve 70 and the pressure control valve 70 can be controlled based on the signals of the handle steering angle. |
