Lubricating and breather system in engine

Details Lubricating and breather system in engine Lubricating and breather system in engine

1997-11-06

1999-08-17

McMahon, Marguerite

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F01M 300

Patent

active

059378360

ABSTRACT:
A lubricating and breather system is provided for use with a crankcase and a cylinder block in both a horizontal-type engine and a vertical-type engine, in which the discharge of a blow-by gas and the circulation of oil separated from the blow-by gas into the crankcase can be reliably performed. When the engine is of a vertical-type, it includes a crankcase which is disposed so that a second bearing boss is located above a first bearing boss. The second bearing boss is provided with an annular chamber into which splashed oil produced in the crankcase is passed. A breather chamber is provided in a cylinder block to communicate with the annular chamber, and includes a first return bore provided in a portion thereof which is a lowermost portion when in the horizontal-type engine, and a second return bore in a portion thereof which is a lowermost portion when in the vertical-type engine.

REFERENCES:
patent: 4470389 (1984-09-01), Mitadera et al.
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patent: 5261380 (1993-11-01), Romano
patent: 5447127 (1995-09-01), Luck et al.
patent: 5474035 (1995-12-01), Ming et al.
patent: 5690084 (1997-11-01), Gunji et al.
patent: 5706769 (1998-01-01), Shimizu
patent: 5794602 (1998-08-01), Kimura

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