Crankcase assembly for a reciprocating machine

A method of assembling a crankcase assembly for a reciprocating machine, comprising the acts of:

• providing a crankcase configured to receive a crankshaft therein;
• inserting a wet cylinder liner into the crankcase;
• mounting a cylinder head configured to charge gas into the wet cylinder liner and discharge pressurized gas from the cylinder on the crankcase at a cylinder head side of the wet cylinder liner opposite a crankshaft side the wet cylinder liner with a cylinder head gasket between the cylinder head and the crankcase,
• wherein
• the cylinder head gasket is configured to prevent leakage of pressurized gas from the wet cylinder liner and is disposed circumferentially spaced from an inner wall of the wet cylinder liner, and
• upon inserting the wet cylinder liner into the crankcase
• a circumferential coolant channel is formed between the inner crankcase wall and an outer wall of the wet cylinder liner,
• a lower sealing arrangement is located between the inner crankcase wall and the wet cylinder liner on a crankshaft side of the circumferential coolant channel, the lower sealing arrangement being configured to prevent leakage of coolant fluid,
• a first upper sealing arrangement is located between the inner crankcase wall and the wet cylinder liner on a cylinder head side of the circumferential coolant channel, the first upper sealing arrangement being configured to prevent leakage of coolant fluid,
• a second upper sealing arrangement spaced axially apart from the first upper sealing arrangement is located radially between and in contact with the inner crankcase wall and the wet cylinder liner, and axially between the first upper sealing arrangement and a cylinder head end of the wet cylinder liner within a groove in at least one of the wet cylinder liner and the inner crankcase wall in an inner region of the wet cylinder liner in which gas is pressurized, the second upper sealing arrangement being configured to prevent pressurized gas being applied to the first upper sealing arrangement
• the wet cylinder liner includes a radially protruding circumferential shoulder on the cylinder head side of the coolant channel, and
• the first upper sealing arrangement is provided between a chamfer at a crankshaft side of the radially protruding circumferential shoulder of the wet cylinder liner and a corresponding recess of the inner crankcase wall in which the circumferential shoulder of the wet cylinder liner is located.

A cylinder liner for a wet liner crankcase of a reciprocating machine, comprising:

• a wet cylinder liner, the wet cylinder liner being configured to receive a reciprocating piston therein and to be inserted into the wet liner crankcase,
• wherein an outer wall of the wet cylinder liner is configured to cooperate with an inner wall of the wet liner crankcase to
• form a circumferential coolant channel therebetween, and
• receive therebetween
• a lower sealing arrangement on a crankshaft side of the circumferential coolant channel configured to prevent leakage of coolant fluid,
• a first upper sealing arrangement on a cylinder head side of the circumferential coolant channel configured to prevent leakage of coolant fluid;
• and
• a second upper sealing arrangement spaced axially apart from the first upper sealing arrangement, the second upper sealing arrangement being located radially between and in contact with the inner crankcase wall and the wet cylinder liner, and axially between the first upper sealing arrangement and a cylinder head end of the wet cylinder liner within a groove in at least one of the wet cylinder liner and the inner crankcase wall in an inner region of the wet cylinder liner in which gas is pressurized, the second upper sealing arrangement being configured to prevent pressurized gas being applied to the first upper sealing arrangement,
• the wet cylinder liner includes a radially protruding circumferential shoulder on the cylinder head side of the coolant channel, and
• the outer wall of the wet cylinder liner includes a chamfer at a crankshaft side of the radially protruding circumferential shoulder of the wet cylinder liner configured to receive the first upper sealing arrangement.