| 摘要 |
<p>PURPOSE: To provide a precise regeneration function by moving a regeneration spool based on the supply oil quantity of a pump, increasing the quantity of oil to a tank port during oil discharging from an actuator port and reducing the quantity of oil to a regeneration port. CONSTITUTION: When a main spool 2 is moved in an A direction, a pimp port P and a hydraulic chamber 5 are communicated with each other by an internal passage 6, and a regeneration spool 3 is pushed in a B direction by the supply oil quantity of a pump. At this time, if the quantity of supply oil is small and the set pressure of a pressure setting spring 4 is not maintained, the regeneration spool 3 is not moved in the B direction, after the oil quantity of a return side actuator port is discharged through a passage 12, a part of the oil quantity flows through a passage 22 to a regeneration port, and the residual oil quantity is returned through passage 23 and 24 to a tank port. When the quantity of supply oil is increased, the regeneration spool 3 is moved in the B direction, the opening area of a passage 25 is increased/reduced in proportion to the quantity of supply oil, and when the quantity of supply oil is increased, the quantity of oil returning to the tank port is increased, and the quantity of regeneration oil is reduced in relative relation. Thus, the quantity of regeneration oil is properly increased/reduced.</p> |
