Oil collecting structure of blow-by gas recirculation system...

Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture

Reexamination Certificate

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C123S054400

Reexamination Certificate

active

07966997

ABSTRACT:
An oil return passage that is open at its upper end to a cam chamber and is open at its lower end to a crank chamber is formed to extend from a cylinder head to a cylinder block. A heat exchanger having a double-pipe structure is housed in the oil return passage. Lubricating oil fed from the cam chamber is passed through an oil-collection outer passage of the heat exchanger, and separated oil fed from a separator case of a PCV system is passed through an oil-collection inner passage of the heat exchanger, so that heat of the lubricating oil is imparted to the separated oil. Thus, water contained in the separated oil is evaporated, and the amount of water flowing into an oil pan can be reduced.

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