| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a pump flow rate from an oil pump to be classified more preferably in response to a required flow rate used in an entire hydraulic pressure control system.SOLUTION: An oil passage changing-over valve 2 selectively communicates the first in-flow port 7a and the second in-flow port 7b with a supply port 7e through operation of a spool 8 or enables both in-flow ports 7a, 7b to be communicated with the supply port, and a control unit 21 selects one discharging mode from a small discharging mode for communicating the first in-flow port 7a with the supply port 7e, a middle discharging mode for communicating the second in-flow port 7b with the supply port 7e and a full-discharging mode for communicating both in-flow ports 7a, 7b with the supply port 7e in response to a fluid flow rate required by a control mechanism. As a result, a pump flow rate from an oil pump 1 can be classified more preferably in response to a required flow rate used in the entire hydraulic pressure control system.</p> |
