| 摘要 |
A hydraulic reaction force apparatus for a power steering system includes input and output shafts, guide holes, balls, a reaction force reception portion, a hydraulic reaction force chamber, and a reaction force piston. The output shaft is coaxial with the input shaft, the output shaft and the input shaft being rotatable relative to each other. The guide holes axially extend through a flange formed on one of the input and output shafts. The balls are axially slidable in the guide holes, respectively. The reaction force reception portion is formed on the other one of the input and output shafts so as to oppose one major surface of the flange. The reaction force reception portion is adapted to receive the balls. The hydraulic reaction force chamber is formed on the other major surface of the flange which opposes its one major surface. The reaction force piston is slidably coaxial with the input and output shafts in the hydraulic reaction force chamber. The reaction force piston is adapted to urge the balls against the reaction force reception portion to generate a restriction force corresponding to a reaction force hydraulic pressure between the input and output shafts.
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