| 摘要 |
PURPOSE:To surely prevent improper compression without increasing a number of part items by forming a bearing hole, fitting a pivotal shaft to a crankshaft, in an oval shape and specifically setting the direction of a major diameter of this bearing hole. CONSTITUTION:A bearing hole 10b is formed in an oval shape. This bearing hole 10b respectively forms its major diameter (D1) larger than an outside diameter (D3) of a pivotal shaft 12a and the major diameter (D2) corresponding to the outside diameter (D3) of the pivotal shaft 12a. Further a direction of the major diameter (D1) is set almost on the acting line of a load for a crankshaft 10 of a turning scroll 8. When foreign matter is bitten and/or liquid compression is generated between laps 13, 14, the turning scroll 8 moves to a reaction side of the load P. In this way, improper compression can be surely prevented without increasing a number of part items. |
