초록 ▼

An engine structural assembly is disclosed including an integral head and upper cylinder section assembly for use in combination with an integral crankcase and lower cylinder section assembly wherein the upper and lower assemblies are formed to receive a wet cylinder liner which is adapted to be dir

An engine structural assembly is disclosed including an integral head and upper cylinder section assembly for use in combination with an integral crankcase and lower cylinder section assembly wherein the upper and lower assemblies are formed to receive a wet cylinder liner which is adapted to be directly contacted by engine coolant over only the exterior surfaces of the liner which are received within the upper assembly. For purposes of forming a coolant cavity around the portion of the liner received in the upper assembly, a coolant seal is provided between the liner and the upper assembly adjacent the joinder zone between the upper and lower assemblies. In one embodiment the liner includes a mid stop located adjacent the upper and lower assemblies for holding the mid section of the liner in a fixed axial position and for applying an axial compressive force to the liner along the portion of the liner received within the upper assembly. Greater efficiency, lower weight, easier maintenance and reduced manufacturing costs are achieved by limiting the total axial length of the liner received in the upper assembly to no more than 40%, and preferably approximately 30%, of the total axial length of the liner.

대표청구항 ▼

In an internal combustion engine having a crankshaft, at least one reciprocating piston connected with the crankshaft and a cylinder cavity within which the reciprocating piston moves between upper and lower limits of travel, the combination comprising (a) an integral head and upper cylinder section

In an internal combustion engine having a crankshaft, at least one reciprocating piston connected with the crankshaft and a cylinder cavity within which the reciprocating piston moves between upper and lower limits of travel, the combination comprising (a) an integral head and upper cylinder section assembly containing a recess shaped to form a first portion of the cylinder cavity, said upper assembly being formed of cast iron; (b) an integral crankcase and lower cylinder section assembly containing the remaining portion of the cylinder cavity, said lower assembly being formed of metallic material distinct from cast iron; (c) connection means for connecting said upper and lower assemblies along a joinder zone; (d) liner means disposed within said cylinder cavity portions for guiding the reciprocating movement of the piston within the cylinder cavity, said liner means including an exterior surface spaced from the interior surface of said upper assembly recess to form a coolant cavity shaped to bring coolant into direct contact with no more than 40 percent of the total axial length of said liner means; (e) combustion gas seal means for sealing the upper end portion of said liner means to form a combustion chamber; and (f) coolant seal means disposed adjacent said joinder zone for forming a coolant cavity seal between said liner means and at least one of said upper and lower cylinder section assemblies to cause coolant to contact directly said liner means substantially only along the portion of the liner received within said upper cylinder section assembly.