| 摘要 |
PURPOSE:To reduce unbalance vibrations during rotation by providing an oil feed section feeding lubricating oil to portions needing it and a fluid balancer receiving the lubricating oil from this oil feed section, storing it, and utilizing it to obtain the rotary balance. CONSTITUTION:When a crank shaft 5 is rotated, oil is fed to each sliding surface through an oil feed pipe 18, and the excessive oil drips to a sump section 16 through a gap between a lower bearing 10 and the crank shaft 5, and a predetermined quantity is gradually accumulated. At this time, the sump section 16 is being rotated together with the crank shaft 5, thereby the oil is depressed outward by a centrifugal force and is rotated along the inner surface of a side section 16d. If the rotary unbalance occurs, the oil quantity in the anti-eccentric mass direction against the eccentric mass A is increased as shown in the type figure, and it works as a fluid balancer, thus reducing unbalance vibrations. In the figure, O is the rotating main axis, G is the center of gravity, and S is the rotating center. |
