초록 ▼

A closed passage system surrounding an engine cylinder for cooling purposes. Fins extend longitudinally along the various passage sections to promote heat transfer into the air flowing through the passage. Fin density varies according to the heat load. Near the upper end of the combustion chamber, a

A closed passage system surrounding an engine cylinder for cooling purposes. Fins extend longitudinally along the various passage sections to promote heat transfer into the air flowing through the passage. Fin density varies according to the heat load. Near the upper end of the combustion chamber, a large fin density is used; near the lower end of the chamber a lesser fin density is employed. An effort is made to continuously guide the coolant air for efficient heat removal action.

대표청구항 ▼

In an engine wherein a combustion chamber is defined by an end wall (39), a cylindrical side wall (34), and a movable piston (41) movable back and forth within the cylindrical side wall: the improvement comprising means for air-cooling the cylindrical side wall; said cooling means comprising wall st

In an engine wherein a combustion chamber is defined by an end wall (39), a cylindrical side wall (34), and a movable piston (41) movable back and forth within the cylindrical side wall: the improvement comprising means for air-cooling the cylindrical side wall; said cooling means comprising wall structure defining an annular chamber surrounding the side wall; a pressurized air entrance port means in a portion of the chamber remote from the aforementioned end wall; an air exit port means in a portion of the chamber adjacent to said end wall; and closely spaced heat transfer fins arranged in the annular chamber to intercept pressurized coolant air flowing from the entrance port means to the exit port means; said heat transfer fins occupying the entire circumferential extent of the chamber; said heat transfer fins extending outwardly from the cylindrical side wall; said fins having radial dimensions that are the same as the radial dimension of the annular chamber whereby the air is required to move between fins in order to travel from the entrance port means to the exit port means; the fin density being relatively great near the combustion chamber end wall and relatively less remote from the combustion chamber end wall.