| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control valve that accurately adjusts initial pressure of a pressure control valve, closes the maximum pressure to a theoretical value, and eliminates un-comfortableness of the operability by manufacturing error. SOLUTION: A control spring 25 is set between a piston 29 of the hydraulic control valve 26 and a spool 28, and a shim 30 is interposed between the control spring 25 and the spool 28. The sleeve 32 is slidably engaged with the outside of the spool 28, and is energized by an adjusting spring 33 in the pressing direction of the piston 29. A shim 34 is disposed in the adjusting spring 33, and spring constant of the adjusting spring 33 and thickness of the shim 34 are changeable. The initial pressure is set by adjusting the spring force of the control spring 25 by changing the thickness of the shim 30 and by adjusting the spring force of the adjusting spring 33 by changing the thickness of the shim 34. Therefore, the maximum pressure can be easily and accurately adjusted regardless of the set initial pressure. COPYRIGHT: (C)2004,JPO
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