| 摘要 |
PURPOSE: To prevent a torque converter from stalling in blade operation during digging of bulldozer and soil carrying. CONSTITUTION: An engine rotating sensor 2, a torque converter output shaft rotating sensor 4, and a lift confluence solenoid valve 12 are connected to a control device 16. A blade lift pilot pressure control valve 11 and a first lift control valve 13 are connected to it, and also a second lift control valve 14 is connected to it through the lift confluence solenoid valve 12. Then two hydraulic pumps 20 and 21 and a lift cylinder 15 are connected to it through the first control valve 13 and second lift control valve 14. In addition, a traction output is calculated by a control device 16 and, when it is smaller than a target value, the lift confluence solenoid valve 12 is tuned off so as to halve the flow to a lift cylinder 15 in order to reduce power consumption. Thus the traction output can be increased to prevent stalling. |
