| 摘要 |
PROBLEM TO BE SOLVED: To provide a running mode changeover device which can control the running condition during the working run with lever manipulation of a valve for actuator control and can control the running condition during the normal run with an accelerator pedal in the same manner as in a passenger car. SOLUTION: A running mode changeover device is equipped with a variable capacity hydraulic pump 2 and charging pump 3 for driving oil motors 4A and 4B, and the discharged pressure oil from the charging pump 3 is branched by a branching circuit 5 into the first branch line 6A and second branch line 6B. A running mode selector valve 9 passes forward selectively one of the pressure oil supplied from the first branch line 6A through a prime mover output sensitive valve 7 and the pressure oil supplied from the second branch line 6B. A hydraulic cylinder 12 controls the discharge amount, etc., of pressure oil from the pump 2. An actuator controlling valve 11 controls the hydraulic cylinder 12 through the control of the pressure oil supply condition to the oil chambers 12a and 12b of the cylinder 12. |
