| 摘要 |
More lubricating oil can be supplied to a connecting rod bearing provided in a connecting rod to provide excellent lubrication between the connecting rod and a crank pin. A pair of oil groove portions 13a and 13b is provided in an inner circumferential surface portion 17 of a crank journal bearing 11, which extends in the movement direction of a piston 32 and which is disposed opposite to each other. A lubricating oil supplying passage 28 is provided between the crank journal 10 and the crank pin 20, one end portion 29 of which is opened to the groove portions 13a and 13b provided in the crank journal bearing 11, the other end portion 30 of which is opened to an inner circumferential surface portion 23 of the connecting rod bearing 22, and which supplies the lubricating oil to the connecting rod bearing 22.
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