Abstract: A power end assembly includes a crankshaft section, a crosshead section, and a connector section coupled together by one, two, or more sets of stay rods. The power end may include one or more support plates that are coupled to the crankshaft section and/or crosshead section. The crosshead section includes a plurality of individual crosshead frames. The connector section may include a plurality of individual connector plates or may be a unitary connector plate. The power end is configured to be coupled to a fluid end assembly by coupling the fluid end assembly to the connector plates.

Abstract: The present invention provides a power generation device that can not only reduce the generation of vibration but also increase thermal efficiency. A power generation device (10A) includes: an engine (1) in which a right crankshaft (31) and a left crankshaft (32) rotate in opposite directions to each other; a right flywheel (41) and left flywheel (42) as a primary inertia body; and a power generation motor (2) as a secondary inertia body, a total inertia moment in a first rotation direction and a total inertia moment in a second rotation direction being balanced with each other by not less than 50%.

Abstract: A system for cooling a cylinder head includes a cylinder head, a cylinder block, and a waste heat recovery system. The cylinder head includes a first water jacket and a second water jacket. The cylinder block is coupled to the cylinder head. The cylinder block includes a third water jacket. The first water jacket is coupled to a first cooling circuit. The second water jacket is coupled to a second cooling circuit. The third water jacket is coupled to a third cooling circuit. The waste heat recovery system is coupled to at least one of the first cooling circuit, the second cooling circuit, and the third cooling circuit.

Abstract: A water jacket having a coolant flow crossing the space over the cylinder head is provided for an internal combustion engine of an automotive system. The internal combustion engine is equipped with a cylinder and a cylinder head. The water jacket includes a lower water jacket having side passages surrounding the cylinder and connected together by a plurality of branches disposed over the cylinder head, so as to create the coolant flow crossing the space over the cylinder head.

Abstract: This internal combustion engine comprising a variable compression ratio mechanism either measures an exhaust temperature or exhaust pressure which varies according to an actual expansion ratio, or measures a physical quantity which varies according to the exhaust temperature and/or the exhaust pressure, and estimates the current mechanical compression ratio on the basis of the measured value.

Abstract: An apparatus includes an oil-jet emplacement assembly and an oil-jet sheltering assembly. The oil-jet emplacement assembly is configured to spatially emplace an oil-jet device at an installation position relative to an engine block of a vehicle. The oil-jet sheltering assembly is positioned relative to the oil-jet emplacement assembly. The oil-jet sheltering assembly is configured to protectively shelter the oil-jet device from inadvertent oil-jet installation damage.

Abstract: A cooling water passage structure of internal combustion engines is provided which can contribute to a scale-down of the external form of the engine and also can prevent deformation of the cylinder bores. The cooling water passage structure comprises a water jacket for the flow of cooling water provided on the peripheries of a plurality of cylinder bores; and a lateral suction passage 9a, 9b integrally formed with a side wall of a cylinder block 2 having bolt holes formed for fastening a cylinder head 3. The lateral suction passage runs through by the cylinder bores at a height in the vicinity of the water jacket bottom and is arranged on the outside of, and perpendicular to the bolt holes. On the rear surface of the cylinder head 3 is mounted a water passage block 15 and on the front end part of the cylinder block 2 is provided a water pump housing 10.