Aspects of the present disclosure are directed to a cylinder housing of an internal combustion engine. In one embodiment of the present disclosure, the cylinder housing includes at least two adjacently arranged cylinders, each of which includes a wet cylinder liner, a support structure, and a coolant jacket arranged between the support structure and the cylinder liner. The cylinder housing further including at least one screw receptacle for a cylinder head screw, and is positioned between at least two adjacently arranged cylinders in a region of at least one engine transverse plane.

An internal combustion engine that can ensure an adequate cooling performance by using a small number of component parts, and can be minimized in size. The cooling device includes a boiling water cooling device including a water jacket, coolant piping, steam piping and a radiator, an air cooling fan connected to one end of a crankshaft projecting from an outer surface of the engine main body, and a cover member provided on the engine main body so as to cover the air cooling fan, and define a cooling air passage extending to a radiator core.

An internal combustion engine includes an anisotropic thermal conductivity member (37, 51) provided on a wall surface defining a cylinder or a wall surface of a cooling water passage on a side of the cylinder, a thermal conductivity of the anisotropic thermal conductivity member in an axial direction of the cylinder being higher than a thermal conductivity of the anisotropic thermal conductivity member in a radial direction of the cylinder, and a thermally insulating member (38. 52) provided on an outer surface of the anisotropic thermal conductivity member with respect to the radial direction of the cylinder.

A slide for the high pressure die casting of at least one closed deck engine block having at least one cylinder is disclosed. The slide includes a tool steel portion with reliefs for forming a water jacket surrounding each cylinder. At least one expendable salt core is located in each relief, the salt core having an inner surface and an outer surface with an aperture extending therethrough. The outer surface and inner surface of the salt core is coextensive with an inner surface and outer surface of the tool steel portion. A method for high pressure die casting a closed deck engine block using the disclosed slide and expendable salt cores is also disclosed. The expendable salt cores are separable from the reliefs in the slide, and form bridges or supports across a water jacket to add stiffness and rigidity to the cast engine cylinders.

There is provided a vertical multicylinder straight engine in which the temperature distribution of a plurality of cylinder barrels is made close to an even state. A cylinder jacket includes: a jacket inlet; a separated channel; a plurality of separated outlets; and heat dissipator channels for dissipating heat of the respective cylinder barrels to engine cooling water introduced through the separated outlets. The plurality of separated outlets include: a front-side separated outlet to a front-end barrel; a rear-side separated outlet to a rear-end barrel; and middle separated outlets to middle barrels between the front-end barrel and the rear-end barrel, and the jacket inlet is disposed so as to be contained within an entire middle barrel side area that is lateral to the middle barrels and has a front-rear length as long as a length from a front-most end to a rear-most end of the middle barrels.

A method for manufacturing an engine block is disclosed. In embodiments, the method includes forming an expansion hole in a block body of the engine block that encircles an engine block bore at a head face of the engine block. The method also includes placing an insert into the expansion hole, the insert including an insert body. The method further includes placing a reaction material between the insert and the block body. The method yet further includes forming an insert bond layer between the insert and block body using the reaction material. The method still further includes forming an insert bore through the insert body.

A cylinder block for an internal combustion engine includes a main cylinder block defining a plurality of first cylinder chambers. A secondary cylinder block is assembled to an upper surface of the main cylinder block and defines a plurality of second cylinder chambers that align with respective ones of the plurality of first cylinder chambers. A plurality of cylinder liners are disposed in the corresponding plurality of first and second cylinder chambers of the main cylinder block and the secondary cylinder block.

A cast-aluminum engine block for a compression-ignition internal combustion engine includes a plurality of cylinders that are disposed in an in-line arrangement. The engine block includes a top portion including a top deck and a bottom portion including a plurality of main bearings that are disposed to support journals of a crankshaft. An integrated flow channel is formed between the second end and the last cylinder and proximal to the top deck, and is a continuous channel that passes from the first side to the second side through the portion of the engine block between the second end and the last cylinder and proximal to the top deck. A coolant passageway is disposed in the engine block between the integrated flow channel and the last cylinder, and is oriented parallel to the elevation axis.

A cast-aluminum engine block for a compression-ignition internal combustion engine includes a plurality of cylinders that are disposed in an in-line arrangement. The engine block includes a top portion including a top deck and a bottom portion including a plurality of main bearings that are disposed to support journals of a crankshaft. An integrated flow channel is formed between the second end and the last cylinder and proximal to the top deck, and is a continuous channel that passes from the first side to the second side through the portion of the engine block between the second end and the last cylinder and proximal to the top deck. A coolant passageway is disposed in the engine block between the integrated flow channel and the last cylinder, and is oriented parallel to the elevation axis.

A cooling structure of a water-cooled engine includes: a plurality of cylinders 2 arranged in a cylinder block 1; and a water jacket W formed around the plurality of cylinders 2. The water jacket W includes a pair of main flow paths 7, 8 formed in a state of extending in a cylinder arrangement direction outside the cylinders, and inter-bore flow paths 9, 10 formed between adjacent cylinders 2 in a state of connecting the pair of main flow paths 7, 8. Guide walls 11h, 13h, capable of guiding the cooling water flowing in the main flow paths 7, 8 to the inter-bore flow paths 9, 10, are formed in the cylinder block 1.