| 摘要 |
PURPOSE:To improve performance by decreasing a load for a bearing and increase reliability by eliminating bearing troubles due to biased loading by a method wherein an inertia weight is fixed to a shaft to exert the centrifugal force thereof into the opposite direction of a radial direction load. CONSTITUTION:A balance weight 9 is provided at the lower part of a shaft pin and the balance weight 10 is provided at the lower end of a rotor in order to cancel the centrifugal force acting on the shaft 7 by the rotating eccentric masses of the rotor 3, a rotary scroll 5 and an eccentric pin 26. Further, in order to reduce a hydraulic force acting on the rotary scroll, the upper balance weight 9 is provided with an upper balancer 27 and the lower balance weight 10 is provided with the lower balancer 28. The centrifugal forces Ff1, Ff2 of the upper and lower balancers 27, 28 balance with the hydraulic force Fm acting on the eccentric pin from the rotary scroll. |
