| 摘要 |
A power steering system for steering a vehicle includes a motor, a steering shaft coupled with dirigible wheels to be steered, a torque sensor for detecting a torque applied to the steering shaft, and a power converting mechanism, engaged with a power transmitting shaft and coupled with the dirigible wheels, for converting the driving power into a rotary power rotating the power transmitting shaft in one of two opposite directions depending on a direction of the torque. The power converting mechanism includes a power transmitting mechanism having a first gear for rotating in unison with the motor, a second and a third gears coupled with the first means for rotating in two opposite directions, a plate for selectively transmitting a rotational power of one of the second and the third gears to the power transmitting shaft depending on the direction of the torque, a pair of magneto-rheological fluids tightly sealed within a space between the second and the third gears and the plate respectively, and a pair of coils wound around the magneto-rheological fluids.
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