| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method of shift operation of a fluid-pressure device in order not to substantially generate cavitation or noise. SOLUTION: The fluid-pressure device(10) of a multi-stage speed change type between the first and the second speed ratio, of which shift operation is controlled, is provided with a gerotor gear set fixing a plurality of flow rooms which expand and contract. Under the first condition, the first speed ratio is constituted. Then under the second condition, the device(10) is provided with a shift valve means(61)in order to constitute the second speed ratio by making the plurality of flow rooms recirculating flow rooms. Then the shift valve means(61) is shifted between the first and the second conditions according to a change of a pilot pressure signal(71). The control method is also provided with a pressure control valve(75) so that it can be connected to a fluid source(73), then the pilot pressure signal(71) is sent to the shift valve means(61) according to a change of an electric command signal(113). When a command to shift to the second condition is given, the electric command signal(113) is changed at the interval(T1). When a command to shift to the first condition is given, the electric command signal(113) is changed at the interval(T2) which is longer than T1. COPYRIGHT: (C)2005,JPO&NCIPI
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