Reinforced cylinder for an internal combustion engine

Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail

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F02F 300

Patent

active

052713636

ABSTRACT:
The engine housing for a small internal combustion engine lessens exhaust emissions by reducing cylinder bore distortion during manufacture and during use. Cylinder bore distortion is reduced by providing reinforcing material in two opposed wall sections for a relatively small length of the total cylinder length. This uppermost cylinder wall portion also includes bolt bosses for receiving the cylinder head bolts. The cylinder is divided into successive cylinder wall portions along its length, with the thicknesses of the cylinder walls decreasing in each wall portion away from the cylinder head. Cylinder bore distortion is also lessened by using concentric air vanes instead of the asymmetrically-shaped vanes typical of prior art engine housings.

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