Reciprocating piston internal combustion engine with at least one cylinder bushing

Claim 1

A water cooled reciprocating piston internal combustion engine which includes: an engine frame, a cylinder bushing inserted in said engine frame and having one end provided with a collar and being supported by said engine frame, said bushing together with said engine frame defining an annular chamber adapted to receive cooling water, a mantle-formed heat jacket arranged with said cylinder bushing and having a wall portion defining an inner surface and an outer surface thereof arranged for contact with the content of said annular chamber, said heat jacket extending from the cooling water chamber, said at least into the vicinity of said collar and while being arranged to receive and keep contained a liquid heat carrier therein having its inner surface arranged as means to create a capillary effect internally to permit such liquid heat carrier in said heat jacket to flow therein against the force of gravity in the longitudinal direction of and along said cylinder bushing for improved heat dissipation in the upper thermally highly loaded region of the bushing which must be cooled intensively so that rigidity and strength of the cylinder bushing is uninfluenced, wherein substantially all of said inner surface rests against said bushing and said outer surface projects into said cooling water chamber that receives cooling water.