| 摘要 |
PROBLEM TO BE SOLVED: To arrange a driving circuit of a hydraulic motor so that the rotational speed range of an auger screw can be enlarged. SOLUTION: A pair of hydraulic motors 23 and 24 for driving the auger screw are used as multi-stroke type motors, motor discharging capacities M1 and M2 can be changed into large and small by switching selector valves 31 to 34, at the same time, inlet and outlet ports (a) to (d) of the hydraulic motors 23 and 24 are connected to a tank by switching selector valves 35 and 36, and either one of the hydraulic motors 23 and 24 can be made as a free wheel. The selector valves 31 to 36 are switched by solenoid valves 51 to 54, and the solenoid valves 51 to 54 are switched and controlled in accordance with a speed command to change the number of revolutions of an output shaft 11a of the auger screw 12. COPYRIGHT: (C)2004,JPO
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