| 摘要 |
PURPOSE:To prevent occurrence of resonance, by displacing the arranged position of a counterweight for a crankshaft in accordance with a change of speed of an engine and controlling a generating condition of vibration in accordance with the change of speed of the engine. CONSTITUTION:A long hole shaped housing chamber 11 is formed to an almost opposite position to a crank pin 5 with respect to the center 0 of a crankshaft, and a short column shaped counterweight 14 is longitudinally movably housed in the chamber 11. The counterweight 14 is radially externally displaced against a spring 15 while displaced with also an angular position about the crankshaft in accordance with a change of revolution of the crankshaft. Accordingly, a level of vibrating force, applied to each part of a machine device mounted with an engine, can be controlled in accordance with a change of speed of the engine, and a generating condition of vibration in each part of the machine device can be controlled. |
