| 摘要 |
When the supply of oil from an oil supply passage (27) to an upper bearing (62) is stopped due to the running out of oil, oil stored in a crank chamber (54) is supplied from the crank chamber (54) to the upper bearing (62) through both a bearing back surface passage (53a) and a ring groove (24a) by the pumping action of a helical groove (24b). |
