| 摘要 |
An improved apparatus (30) for steering rear wheels (16, 18) of a vehicle (10) includes hydraulic motor (34) having chambers (56, 58) which hold hydraulic fluid. An increase in fluid pressure in one of the chambers turns the steerable rear wheels of the vehicle in a first direction. An increase in fluid pressure in another one of the chambers turns the steerable rear wheels in a second direction. A control valve (36) is connected in fluid communication with the chambers (56, 58) of the hydraulic motor. The control valve (36) is free of a return flow of hydraulic fluid from the motor (34). A return conduit (134) is connected with the chambers (56, 58) and conducts a flow of hydraulic fluid to a reservoir (116) along a path which is spaced from the control valve (36). The motor (34) may include springs (70, 72) which are disposed in the chambers (56, 58) of the motor. Biasing sleeves (76, 78) are effective to transmit force from the springs to a piston (62).
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