| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce valve opening pressure on the high pressure side against the low pressure side of a shuttle valve assembly in a fluid pressure device. SOLUTION: In this fluid pressure device, a shuttle bore 35 is formed in a housing having high pressure and low pressure ports. A shuttle valve assembly 51 including a shuttle spool 63 is arranged within the shuttle bore 35. In the shuttle spool 63, a fluid passage 87 communicating a low pressure chamber 57 and a shuttle outlet 85 by fluid is formed when the shuttle spool 63 moves from a neutral position to an end part of a center region position. Low pressure fluid of the low pressure chamber 57 acts on a shuttle poppet member 75 via the fluid passage 87 and assists the shuttle spool 63 and a shoulder part 67 to open the poppet member 75 and thereby fluid pressure of a high pressure chamber 55 necessary to open the shuttle valve assembly 51 is reduced. As a result, branch of fluid for cooling and lubrication is generated over operating pressure of a wider range and opportunities of damaging part of a system is minimized.</p> |
