| 摘要 |
PURPOSE:To improve the operability of a hydrostatic pump, by a method wherein chambers across a servo piston are interconnected through the throttle parts of a servo bypass valve, and the throttle parts are closed only when a control command pressure is exerted. CONSTITUTION:Chambers 27 and 28 across a servo piston 26 of a servo cylinder 6 are interconnected through throttle parts 40 and 41 of a servo bypass valve 31. The throttle parts 40 and 41 of the servo bypass valve 31 are closed only when a control command pressure is exerted. Acceleration and deceleration properties, which are similar to preceding properties, are obtained during acceleration and deceleration of a motor, and when a control lever 29 during deceleration is brought to a neutral position, a hydrostatic motor is easily forced into a stop and besides at an arbitrary position. This enables sharp improvement of the operability of the hydrostatic pump. |
