| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the breakage of a driving shaft without suppressing the pump capacities of hydraulic pumps in the state of constructing two hydraulic pumps to be connected in parallel to one driving shaft. <P>SOLUTION: The left travel pump 12 and the dozer pump 13 are constructed to be connected in parallel to a common intermediate shaft. In this state, a proportional electromagnetic type variable relief valve 37 is provided as a relief valve for the dozer pump. During simultaneous operation of travel and dozer actuation, a controller 30 controls the set pressure of the variable relief valve 37 depending on the output torque of the left travel pump 12 to restrict the output torque of the dozer pump 13. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
