| 摘要 |
PURPOSE:To improve stability of control and responsiveness by providing a variable throttle mechanism between the first and second spools and throttling the control oil pressure amount according to the relative movement of both spools. CONSTITUTION:Spring load of a spring 66 is applied to the left end of the second spool 43 and hydraulic power according to the car velocity is applied to the right end thereof. The second spool 43 is relatively moved according to a difference between the above control forces. Variable throttle mechanisms 78, 79 are respectively formed by oil paths 47, 49, 48, 50 and annular grooves 76, 77. The relative position of the second spool 43 to the first spool 42 depends upon the car velocity. Therefore, the supply amount of control oil pressure to a hydraulic cylinder 19 is continuously adjusted to the car velocity by the variable throttle mechanisms 78, 79 so as to improve the stability of control and responsiveness.
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