| 摘要 |
PROBLEM TO BE SOLVED: To prevent the steering feeling of a driver from being influenced, by making first and second variable throttles center close while third and fourth variable throttles center open. SOLUTION: Left and right control grooves 31, 32 are communicated with left and right chambers 26, 27 of power cylinder PC and discharge grooves 34, 35 are communicated with a tank. On both sides of first supply groove 33 the left and right control grooves 31, 32 are positioned and outside the grooves 31, 32 the discharge grooves 34, 35 are positioned. The grooves 33, 32 constructs a first variable restrictor 22 while the grooves 33, 32 a second variable throttle 23. The grooves 32, 35 constructs a third throttle 24 while the groove 31, 34 a fourth variable throttle 25. The throttle 22, 23 are made center close while the throttles 24, 25 center open. Accordingly almost no influence of shock at the time of muximum flow of supply is given to a driver. |
