| 摘要 |
PURPOSE:To decrease the drive force of a shutter valve so as to aim at stabilizing the operation of a shock absorber by coupling the shutter valve integrally incorporated with an actuating piston, at one end to an electromagnetic drive section through a connecting rod and at the other end to a pressure sensing in projected into a lower chamber. CONSTITUTION:A piston 11 sections the inside of a cylinder into upper and lower chambers 10, 13, and is connected to an actuator 4 having an electromagnetic drive section through a rod 6. A shutter valve mechanism 12 is integrally incorporated with the piston 11, and a shutter valve 25 is coupled to the electromagnetic drive section through a connecting rod 7. A pressure sensing pin 28 adapted to be projected into a lower chamber 13 is formed on the shutter valve 25 on the side remote from the connecting rod 7. An electromagnetic drive section of the valve body 25 and the pressure sensing pin 28 drive shutter valve sections on the extension and retraction sides, shut-off valves on the extension and retraction sides. With this arrangement, the shutter valve may be actuated under a small power, thereby it is possible to stabilize the operation. |
