A seal structure for an internal combustion engine comprising: a cover side seal member which extends on upper surface sides or lower surface sides of both of an engine main body section and a chain casing and pressed and held against a cover member; a casing side seal member arranged at left or right end section of one end surfaces of the engine main body section onto which the chain casing is attached and pressed and held against the chain casing; a receiving concavity formed to extend on a junction surface of the chain casing to the cover member; and an extremely thick connection block section formed integrally on one end section of the casing side seal member, fitted into and retained by the receiving concavity, and projected more toward the cover member side than a junction surface of the chain casing to the cover member in a free state.

A connecting rod for an internal combustion engine with variable compression, the connecting rod including an eccentrical element adjustment arrangement configured to adjust an effective connecting rod length, wherein the eccentrical element adjustment arrangement includes an eccentrical element that cooperates with an eccentrical element lever and supports rods that engage the eccentrical element lever, and wherein the eccentrical element lever is integrally configured in one piece as a stamped and bent component or fabricated by a massive cold forming method.

A marine engine has a crankcase having a crankshaft that rotates about a vertical crankshaft axis; a cover on the crankcase; and a cooling member disposed in the crankcase. The cooling member has an inner surface that faces the crankshaft and an outer surface that faces the cover. The cooling member is configured such that rotation of the crankshaft causes lubricant in the crankcase to impinge on and drain down both the inner and outer surfaces of the cooling member.

An exhaust valve assembly for a two-stroke internal combustion engine has a housing adapted for connection to an engine block of the two-stroke internal combustion engine; an electric actuator having an electric motor, the electric motor being disposed in the housing; and at least one reciprocating exhaust valve operatively connected to the electric actuator. The at least one exhaust valve is linearly movable by the electric motor. A portion of the at least one exhaust valve is disposed in the housing.

Disclosed is a lubricating apparatus including an oil supply pipe connected to a gearbox of a gearing device for transmitting turning force of a blowdown turbine in the turbo compound system to a crankshaft to supply oil into the gearbox, a first oil supply opening formed to be transpierced at the bearing housing of a first bearing rotatably supporting a shaft of an output gear for outputting turning force in the turbo compound system to supply oil supplied from the gearbox to the first bearing, a sub-supply pipe connected to a gear case in which the output gear is embedded to supply oil to the gear case, and a second oil supply opening formed to be transpierced at the bearing housing of a second bearing rotatably supporting the shaft of the output gear to supply oil supplied through the sub-supply pipe to the second bearing.

An engine cylinder block includes a cylinder block housing and a double-crankshaft mechanism installation case located at a downside of the cylinder block housing. The cylinder block housing is integrally connected with the double-crankshaft mechanism installation case. The cylinder block housing is provided with a cylinder block cavity. The double-crankshaft mechanism installation case is enclosed and formed by an end cover and a side cover. A piston rod guiding groove is installed in the double-crankshaft mechanism installation case. A connecting rod sliding groove is configured through the piston rod guiding groove. A crank operation cavity is configured on both sides of the piston rod guiding groove. A main spindle installation hole is configured on the shell at both ends of each crank operation cavity. A main spindle supporting portion is configured below the main spindle installation hole.

An engine device including a cylinder block (6) for supporting a crankshaft so that the crankshaft is rotatable. Opposite side portions (301, 302) of the cylinder block (6) along a crankshaft axial direction have, on one of their ends relative to the crankshaft axial direction, projecting portions (304, 305) protruding in a direction away from the crankshaft, and reinforcing ribs (306, 307, 308, 309, 310, 311) provided between side walls and the projecting portions (304, 305) of the opposite side portions (301, 302) so that the reinforcing ribs (306, 307, 308, 309, 310, 311) are widened at their sides close to the corresponding projecting portions (304, 305), the projecting portions (304, 305) and the reinforcing ribs (306, 307, 308, 309, 310, 311) being integrally formed with the cylinder block (6).

A module may include a receiving element in the form of a bearing frame or a covering hood for arrangement on a cylinder head of an internal combustion engine. The module may further include a camshaft that is rotatably mounted on the receiving element and projects from the receiving element to hold a camshaft wheel. The module can be prefabricated for direct mounting on the cylinder head. In the prefabrication process, the camshaft may be locked against rotation by an externally accessible securing part in an angular position for acting on valves. The securing part may extend through a first aperture in the camshaft wheel and through or into a receptacle of the receiving element. After mounting the module on the cylinder head, the securing part can be removed.

An engine-driven working machine capable of suppressing vibration, and further securing output power of an engine is provided. An engine-driven working machine 10 is a generator in which an outer case 12 is formed to be substantially rectangular in plan view that extends in a longitudinal direction, and an engine 15 is housed in an inside 13 of the outer case 12. In the generator 10, a crankshaft 41 is disposed to intersect the longitudinal direction of the outer case 12. Further, an intake port 44 and an exhaust port 45 are disposed in the longitudinal direction of the outer case 12. Furthermore, a carburetor 61 is disposed at a side of the intake port 44, and a muffler 67 is disposed at a side of the exhaust port 45.

A support structure for a crankshaft includes a crankshaft that is rotatably supported on a cylinder block of an internal combustion engine and has an end portion protruding from the cylinder block, a sprocket that is attached on the end portion protruding from the cylinder block and is connected to a cam shaft, a pulley that is attached on the end portion on an opposite side from the sprocket with respect to the cylinder block and is connected to an auxiliary apparatus, and an end bearing that rotatably supports the end portion relative to the cylinder block and is provided on the end portion between the sprocket and the pulley.