| 摘要 |
PROBLEM TO BE SOLVED: To reduce assembling processes of parts, and simplify manufacture of an engine by disposing a centrifugal separator attaching seat on a position where an un-purified oil passage is formed, arranging an un-purified oil leading-out passage and a purifying oil leading-in passage, and directly attaching a centrifugal separator on the centrifugal separator attaching seat of an engine side wall. SOLUTION: A centrifugal separator attaching seat 4 is disposed on a position 3 where an un-purified oil passage 2 of a crank chamber side wall 1 is formed. An un-purified oil leading-out passage 5 and a purifying oil leading-in passage 7 are arranged on the centrifugal separator attaching seat 4, the un-purified oil leading-out passage 5 is branched from the un-purified oil passage 2, and the purifying oil leading-in passage 7 is communicated with an oil pan through a crank chamber. An outlet 9 of the un-purified oil leading-out passage 5 and an inlet 16 of the un-purified oil leading-in passage 13 are matched with each other, and an outlet 17 of the purifying oil leading-out passage 14 and an inlet 10 of the purifying oil leading-in passage 7 are matched with each other, in association with the case in which an attached surface 15 in a base part 12 of the centrifugal separator 11 is directly attached on an attaching seat surface 8 of the attaching seat 4.
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