| 摘要 |
PURPOSE:To make it possible to carry out a high-speed turn of a working vehicle having travelling hydraulic motors as its drive power source, by providing such a horsepower control device that high pressure may be cut-off from the side of nondriven hydraulic motor to a control means on the side of driven hydraulic motor. CONSTITUTION:A horse power control device comprises travelling motors 5a, 5b respectively driven by first and second hydraulic pumps 2a, 2b, horsepower control valves 20a, 20b controlled by hydraulic oil fed through shuttle valves 8a, 8b for selecting pressures on the high-pressure side of the hydraulic pumps 2a, 2b, respectively, swash plate control valves 16a, 16b, etc. In this arrangement, solenoid selector valves 25a, 25b are disposed in pipe lines 22, 23 between the shuttle valves 8a, 8b and the horsepower control devices 20a, 20b. Further, coils 25a2, 25b2 in the valves 25a, 25b are energized by switches 28a, 29b which are closed when the control levers 15a, 15b of the swash plate control valves 16a, 16b are set in positions other than their neutral positions, and therefore, the pipe lines 22, 23 are opened. |
