| 摘要 |
PURPOSE:To feed a required quantity of oil to each bearing with a simple structure by feeding oil to each bearing with a central oil feed hole provided in a crank shaft and branch pipes opening on the bearing surface, etc. CONSTITUTION:An oil suction pipe 20 is press fit to the central oil feed hole 19 provided on the rotating center of a crank shaft 9 and opened in oil 22 at the lower section of a chamber is sucked an fed to individual bearings 8, 11, 12. That is, the feed oil for the bearings 8, 11 is sucked through said central hole 19 by means of the pressure difference between a discharge pressure and an intermediate chamber pressure, and the oil passes through branch pipes 19a, 19b and further lubricates the bearings 8, 11 through grooves 19x, 19y, then the discharge oil is returned to the lower section of a chamber 1 through a communicating hole 4a togehter with discharge gas. The lower bearing 12 is likewise fed with oil through a branch pipe 19c and a groove 19z. Accordingly, a required quantity of oil can be fed to each bearing with a simple structure. |
