| 摘要 |
PURPOSE:To increase load capacity of a bearing, by forming oil grooves with circumferential and radial grooves in a thrust bearing surface, placing a minimum squared portion surrounded by the both grooves in a rocking diameter of a rocking scroll and supplying oil to every part. CONSTITUTION:A radial oil groove 91 and circumferential oil groove 92 are combined, and a minimum squared portion surrounded by the both grooves is placed in the rocking diameter of a rocking scroll 2, then every part is arranged feedable with oil to allow a back side of the rocking scroll 2 to cross the oil grooves 91, 92 surely at some place during a revolution. Further when the rocking scroll 2 moves rocking across the oil groove 91 or 92, fluid pressure is gnerated by pressing lubricating oil into the oil groove, and fully endurable force against thrust force applied from the rocking scroll 2 can be generated, then load capacity of a thrust bearing is increased, thus its durability can be improved. |
