Piston assembly of internal combustion engine

Details Piston assembly of internal combustion engine Piston assembly of internal combustion engine

1990-07-25

1991-07-30

Dolinar, Andrew M.

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder detail

92208, 277216, F02F 300

Patent

active

050352105

ABSTRACT:
A piston assembly of an internal combustion engine is provided with a piston structure with which oil comsumption is suppressed. A piston of the assembly is disposed inside each cylinder wall of the engine and formed with a top land and the second land. A compression ring groove is formed between the top and second lands. A first chamfered surface is formed at the upper peripheral edge of the second land, and a second chamfered surface larger in width than the first chamfered surface is formed at the lower peripheral edge of the top land. A compression ring having a butt-type ring gap is disposed in the compression ring groove to be slidably contacted with the cylinder wall. With this structure, the oil comsumption is effectively suppressed in both high pressure and negative pressure conditions during operation of the combustion chamber corresponding to the cylinder.

REFERENCES:
patent: 3862480 (1975-01-01), Packard et al.
patent: 4079661 (1978-03-01), Goloff
patent: 4193179 (1980-03-01), Confer et al.
patent: 4838149 (1989-06-01), Donnison et al.

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