Internal combustion engine piston with top-land circumferential

Details Internal combustion engine piston with top-land circumferential Internal combustion engine piston with top-land circumferential

1990-03-27

1991-10-01

Look, Edward K.

Expansible chamber devices

Piston

Plural integral radially extending resilient metallic...

92223, F02F 302, F02F 312, F02F 328

Patent

active

050522817

ABSTRACT:
A piston installed into a cylinder of an engine includes annular projections formed in axially spaced relation on a top land facing a cylinder inner wall and having a saw-toothed cross-section in which the external diameter of the projections are such that, when cold, that adjacent the lower end of the top land is greater than that adjacent the upper end thereof. Thereby the effective clearance between the top land face and the cylinder inner wall is reduced. This causes a reduction in the hydrocarbon content of the incompletely consumed combustion gas, and prevents the temperature from rising in the top ring groove and thus prevents the wearing of the groove.

REFERENCES:
patent: 1360498 (1920-11-01), Chandlee
patent: 2344416 (1944-03-01), Scheibe
patent: 2845917 (1958-08-01), Laubender

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