| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the size of an entire device without using a selector valve of which the spool diameter is likely to be large for a passage connecting a main pump with a circuit system. <P>SOLUTION: A device includes: a first logic valve 13 which is installed on a passage "a" for merging discharge oil of an assist pump AP into a first supply passage 1 communicating a first main pump MP1 with a first circuit system, and allows only flow from the assist pump to the first circuit system; an open/close valve 14 for communicating a pilot chamber 13e of the first logic valve with the first supply passage, or shutting off the communication; and a second logic valve 26 which is installed on second supply passages 16a and 16b for communicating a second main pump MP2 with a second circuit system, and allows only flow from the second main pump to the second circuit system. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
