| 摘要 |
PURPOSE:To prevent leakage of lubricating oil by solidly forming oil grooves by casting on the contact surface of a bearing member and an engine body and lubricating a bearing portion with lubricating, oil in the oil grooves. CONSTITUTION:Oil grooves 22, 23 are formed between notches 17b, 18b and between notches 17b, 19b of a joining surface 15a, and oil grooves 24, 25 are formed on the peripheral surfaces of the notches 18b, 19b. The oil grooves 22, 23 respectively communicate with an oil groove 20, so that lubricating oil is conducted into the oil groove 20 to be conducted into the respective oil grooves 22-25. Accordingly, as the notches 17b-19b of a bearing member 15 and the oil grooves 22-25 are solidly formed by casting, lubricating oil can be kept from leaking due to defects such as inner casting cavity or the like.
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