| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably supply working oil to a lubricating portion without cooling the working oil by an oil cooler even when the oil cooler and a cooler input check valve are damaged and when a temperature of the working oil is low. <P>SOLUTION: When a hydraulic pressure of working oil supplied to an input port 1c of a cooler input check valve 1 becomes higher than a predetermined hydraulic pressure like when an oil cooler 2 and the like are damaged, a bypass valve 4 is operated to open, so as to supply the working oil at the input port 1c of the cooler input check valve 1 to a predetermined lubricating portion 5 via a bypass pipeline 16. Also, in a place where oil resistance of the working oil is large like in a cold district, the working oil is input to the other input port 1f of the bypass valve 4 via a solenoid valve 9, so that the bypass valve 4 is operated to open, to supply the working oil on the input port 1c side of the cooler input check valve 1 to a predetermined lubricating portion 5 via the bypass pipeline 16. <P>COPYRIGHT: (C)2009,JPO&INPIT |
