| 摘要 |
<p>PURPOSE:To reduce the cost of back hoe by a method in which a back hoe is provided for a vehicle having a pair of oil-pressure motors to separately drive left and right-handed traveler and the oil-pressure motors and cylinders for driving back hoe are operated by only one oil-pressure pump. CONSTITUTION:A slewing base 6 having a prime mover 4 and an operator 5 is attached to a traveler base 3 having a crawler type traveler 1 and a dozer 2, and a back hoe 7 is attached to the base 6 to make up a back hoe device with dozer. The first oil supply circuit to supply oil to an oil-pressure motor M1 and a boom cylinder C6 and the second oil supply circuit to supply oil to other oil-pressure motor M2 and arm cylinder C7 are also provided. During traveling, pressure oil is supplied to the first and second circuits in a fixed amount each by a quantitative dispenser valve. During single operation of boom, etc., whole oil pressure is supplied to the control valve to be operated. The oblique traveling during the traveling period can thus be prevented, and the efficiency of energy can also be enhanced.</p> |
