| 摘要 |
PURPOSE:To simplify a mechanism by a method wherein oil pressure is used for the driving source, and a load cylinder and a pilot spool mutually change the other oil passage to make a reciprocation by only hydraulic force in such an apparatus as generating an exciting force through reciprocation of inertial mass. CONSTITUTION:When a direction switching valve 26 is switched to the right position, the highly pressed oil of a hydraulic pump 25 flows in the work chamber 6a from a passage 18a, the oil in the work chamber 6b flows in a port T from a passage 20b, 19, making the work chamber 6a highly pressed and making the work chamber 6b lowerly pressed to lead to a motion to ward left of the load cylinder 8. As a chamber 23a of pilot spool 12 is connected with the work chamber 6a of high pressure through a port 24a, the oil flows in to produce high pressure, while the chamber 23b is connected with the port T so that the oil flows in to produce low pressure. As a result, the spool 12 moves toward right against a force of spring 13 by a force of action of highly pressed oil in the chamber 23a. This motion toward the right makes the provision passage 17, the passage 18b and the passage 18a, the passage 20a change and communicate simultaneously, making the load cylinder 8 and the spool 12 move toward right for preparation of their reciprocal motion. |
