| 摘要 |
PROBLEM TO BE SOLVED: To reduce an agitating loss of a lubricating oil. SOLUTION: An end part of a screw rotor 11 is rotatably supported by a suction side bearing 14. A first recovering hole 31 is formed in a partition wall 21 between the screw rotor 11 and the suction side bearing 14, and a second recovering hole 32 is formed by bypassing the first recovering hole 31. A recessed part 33 is formed on the partition wall 21, and the first recovering hole 31 and the second recovering hole 32 are opened in the recessed part 33. With such constitution, in the lubricating oil fed from an oiling hole 29, a part lubricates the suction side bearing 14, and flows to the recessed part 33 via the first recovering hole 31, and the residue directly flows to the recessed part 33 via the second recovering hole 32, and is recovered to a compressed air suction passage 34 from the recessed part 33. Thus, an agitating loss in the suction side bearing 14 and an agitating loss on the opening end of the first recovering hole 31 can be reduced.
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