To efficiently raise temperature of lubricating oil at low temperature, when a rotating shaft of an internal combustion engine is supported by a radial sliding bearing via the lubricating oil.
A lubricating oil supply passage 41 for supplying the lubricating oil into a gap between the radial sliding bearing 30 and a crank journal 18 is formed in a bearing holding part 13, and a lubricating oil outlet 43 through which the lubricating oil flows out of the gap between the radial sliding bearing 30 and the crank journal 18 is formed in the radial sliding bearing 30. A bearing back oil path 42 which communicates to the lubricating oil outlet 43 is formed between the bearing holding part 13 and the radial sliding bearing 30, and a heat exchange oil path 44 which communicates with the bearing back oil path 42 is formed in the bearing holding part 13, and the lubricating oil passing through the heat exchange oil path 44 exchanges heat with the lubricating oil passing through the lubricating oil supply passage 41.
SHIMAZU TAKASHI
MITA SHUZO
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