| 摘要 |
PROBLEM TO BE SOLVED: To provide a travelling device for working machines, which can prevent skidding in turning. SOLUTION: This travelling device for working machines is provided with a direct advancing clutch 81 and a turning clutch 82, which transmit the drive force after sub-transmission selectively to a differential gear device 6, in a gear type speed changing mechanism, and a steering lever 21 for controlling the clutch engaging oil pressure of each of the clutches 81 and 82. This travelling device is also equipped with a hydraulic sensor 97 to detect the oil pressure in an HST 18, and a hydraulic control device 88, which converts the control oil pressure of the clutch 82 into a plurality of control modes according to the inclination angle of the steering lever 21, and, if the value detected by the sensor 97 is lowered than a normal value, outputs a control mode to oil pressure out of a plurality of the control modes. COPYRIGHT: (C)2003,JPO
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