| 摘要 |
PROBLEM TO BE SOLVED: To prevent sudden changes in steering auxiliary force by a compact structure, and to obtain good steering feeling, in a hydraulic power steering device changing the steering auxiliary force according to a driving state. SOLUTION: Elastic relative rotation of an input/output shaft according to steering torque for controlling hydraulic pressure for generating steering auxiliary force is regulated by making hydraulic pressure act on a pressure receiving portion. A hydraulic pressure adjusting mechanism 60 adjusting hydraulic pressure acted on the pressure receiving portion according to the driving state of the vehicle, has a first spool 60a movable in a direction changing the opening of a variable throttle 61 in a pressure oil supplying passage 80 to the pressure receiving portion. A boosting speed restricting mechanism 70 restricting the rising speed of the hydraulic pressure adjusted by the hydraulic pressure adjusting mechanism 60 adds elastic force to a second spool 70a arranged in the first spool 60a, as thrust in a direction increasing the opening of the pressure oil supplying passage 80 by an elastic force adding portion 72, and adds thrust in a direction decreasing the opening of the pressure oil supplying passage 80 according to the rising speed of the hydraulic pressure acted on the pressure receiving portion. COPYRIGHT: (C)2006,JPO&NCIPI
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