| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain good steering feeling by providing a simple structure at low costs, in a hydraulic power steering apparatus for changing steering assist power in accordance with a driving condition such as vehicle speed. <P>SOLUTION: A control valve 30 controls oil pressure of pressure oil supplied to a hydraulic actuator 20 for generating the steering assist power, in accordance with the amount of elastic relative rotation between input and output shafts 2, 3. A restricting means 50 for restricting the relative rotation between the input and output shafts 2, 3 in accordance with the driving condition of a vehicle adjusts the oil pressure for pressing one of the input and output shafts 2, 3 via a plunger 52 inserted into a guide hole 51 formed on the other of the input and output shafts 2, 3, in accordance with the driving condition of the vehicle, by means of an oil pressure adjustment mechanism 60. The plunger 52 is guided by the inner circumference of the guide hole 51 to the directions in which the plunger 52 approaches to and separates from the other of the input and output shafts 2, 3 when the input and output shafts 2, 3 relatively rotate. A friction reducing member 53 is interposed between the inner circumference of the guide hole 51 and the outer circumference of the plunger 52. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
