| 摘要 |
PURPOSE:To raise the efficiency of excavating and pushing operations by preventing slip of bulldozer blade by a method in which horizontal and vertical components of excavation resistance are detected and the ratio of both components is compared with a given set value to control the inclination of blade. CONSTITUTION:For obtaining horizontal resistance Rh and vertical resistance Rv, turning angle sensors 10 and 11, a load sensor 12, and an oil pressure sensor 13 are provided. By a CPU 20, the driving of an oil-pressure controller 30 is controlled on the basis of calculated resistances Rh and Rv. The oil pressure to be supplied to a tilt cylinder 4 is controlled to control the pitch angle of the blade 3. Actual tracting force can thus be increased, slip ratio can be lessened, and the wearing of crawler belt by unnecessary slip can be prevented.
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