| 摘要 |
PURPOSE:To make soft turning at a crawler possible by detecting rotation of a part related to a differential gear, and controlling so that rotating speed of a case of a differential mechanism becomes prescribed rotating speed in the differential transmission gear to transmit motive power from a prime mover to left and right driving shafts through the differential mechanism. CONSTITUTION:A high speed/low speed switching part 3 is switched to low speed, and when a detecting switch 4 detects this, in a controller 12, operation is carried out according to a pulse signal from a turning position switch 15 or 16 when either one of side clutch levers 13 and 14 is operated when a machine body is turned and output signals from respective rotating speed detecting pickups 5 and 11 to detect rotating speed of an input gear N1 and a brake gear N2. A piston of a hydraulic cylinder 18 is actuated so as to extend and contract by controlling a double solenoid valve 17, and rotating speed Nd of a case of a differential device is controlled through a brake 9. Thereby, when pivotal or ultra pivotal turn is carried out, the machine body can turn in either left or right direction in a well balanced condition.
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