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    • 6. 发明专利
    • Oil degradation preventing apparatus for an internal combustion engine
    • JP5307061B2
    • 2013-10-02
    • JP2010056132
    • 2010-03-12
    • トヨタ自動車株式会社株式会社豊田中央研究所
    • 規夫 稲見浩司 森谷
    • F01M13/00
    • PROBLEM TO BE SOLVED: To provide an oil deterioration preventing device of an internal combustion engine, inhibiting generation of sludge and deterioration of oil. SOLUTION: A valve operating chamber 22 region of a cylinder head and a crank chamber 24 region below a cylinder block are formed dividedly, and a lower end opening of an oil returning passage 19 from the valve operating chamber region to the crank chamber region is immersed in oil in the crank chamber region. The oil deterioration preventing device is provided with a first blow-by gas reflux passage 38 recirculating blow-by gas of the crank chamber region to an intake system, a second blow-by gas reflux passage 44 recirculating blow-by gas of the valve operating chamber region to the intake system, a first fresh air introduction passage 42 introducing fresh air into the crank chamber region, and a second fresh air introduction passage 48 introducing fresh air into the valve operating chamber region. A connection position 48A of the second fresh air introduction passage 48 to the intake system is more upstream of an intake passage than a connection position 44A of the second blow-by gas reflux passage 44 to the intake system, and both connection positions are upstream of a throttle valve 34. COPYRIGHT: (C)2011,JPO&INPIT