| 摘要 |
A power steering gear mechanism comprising a pinion adapted to be connected drivably to the steering gear linkage for a road vehicle, a pressure cylinder, a double acting piston movable in said cylinder and defining therewith a pair of pressure chambers, said piston being connected to or having formed thereon a gear rack that engages said pinion, a rotary valve mechanism having an internal rotatable valve element connected to a power input shaft, a valve sleeve adapted to be connected and to be rotatable with said pinion, fluid porting in said sleeve for distributing working pressure to either pressure chamber as a result of rotary displacement of said valve element with respect to said valve sleeve, the porting being arranged such that high pressure fluid in the porting establishes on said sleeve a force that urges said sleeve toward said pinion, the low pressure outlet port on said sleeve being situated at the end of said valve sleeve adjacent said pinion.
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