| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic power steering apparatus capable of reducing the number of components, reducing the working cost, and ensuring a smooth operation. SOLUTION: When the relative rotation between input and output shafts 2, 3 connected to each other by a torsion bar 6 is converted into the relative rotation between an outer valve element 31 and an inner valve element 32, the ratio of the relative rotational angle of the latter to the relative rotational angle of the former is changed according to the driving condition of a vehicle. The hydraulic pressure for generating the steering assist force is controlled according to the relative rotational angle between the valve elements 31, 32. The outer valve element 31 is coaxially and relatively rotatable to the input and output shafts 2, 3, and the inner valve element 32 is integrally formed with the input shaft 2. A rocking member 54 is supported by first, second and third supporting units 51, 52 and 53 which are subjected to the accompanying rotation with the input and output shafts 2, 3 and the outer valve element 31. Any one of the first, second and third supporting units 51, 52, 53 is displaced in the axial direction by the distance according to the driving condition of the vehicle. COPYRIGHT: (C)2007,JPO&INPIT
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