The present invention is an internal combustion engine composed of a plurality of cylinders arranged into banks. Located near the mid-point of each bank of cylinders is a section formed with passages that are configured to provide distribution and recovery of cooling and lubrication fluids. This section is located such that the path of these fluids begins and ends at a mid-point so as to provide a shortened path across each half of the bank of cylinders within which the section is located.

A lubricating oil supply structure includes: a shaft; a bearing supporting the shaft and having an oil supply port, through which lubricating oil is supplied to between the shaft and the bearing, and an oil introduction port, through which the lubricating oil is introduced; a first oil passage, connected to the oil supply port, distributing the lubricating oil from an oil pump toward the oil supply port; a second oil passage, connected to the oil introduction port, supplying the lubricating oil introduced through the oil introduction port to a supply destination; a connection oil passage, formed by a gap between the bearing and the shaft, connecting between the first oil passage and the second oil passage, and a throttle portion, formed on a part of the connection oil passage, suppressing a flow of the lubricating oil from the oil supply port toward the oil introduction port.

An object of the present invention is to simplify portions of an oil supply passage which portions are formed at a cylinder block. An oil supply device according to the present invention includes a cylinder block, an oil pan, an oil pump, and an oil filter. Wall portions of the oil pan are coupled to wall portions of the cylinder block. An oil filter is attached to the oil pan. An upstream oil supply passage through which the oil filtrated by the oil filter flows is formed at the oil pan. A downstream oil supply passage including a main gallery extending in a cylinder column direction is formed at the cylinder block. A first communication passage through which the main gallery and the upstream oil supply passage communicate with each other is formed at the wall portion of the cylinder block and the wall portion of the oil pan.

Disclosed herein is a support structure for a rotary part of an engine (2). The support structure includes crank journal bearing metals (14) and crank pin bearing metals (24, 124). Each crank journal bearing metal (14) includes chamfers (16) and crowned portions (17). On the other hand, each crank pin bearing metal (24, 124) includes chamfers (26) and no crowned portion or crowned portions (127) on its inner peripheral surface. The crowned portions (127) are inclined at a smaller angle than the crowned portions (17).

An outboard motor comprises an engine block having vertically-aligned first and second banks of cylinders that extend from each other in a V-shape, a vertically-extending central drain passage located below the first bank of cylinders and being configured to drain lubricant to an underlying sump, a vertically-extending crankshaft, and a central deflector located between the first and second banks of cylinders. The central deflector extends from the engine block towards the crankshaft and being configured to deflect lubricant away from the crankshaft to the central drain passage.

Methods and systems are provided for an engine housing assembly. In one example, an engine housing assembly comprises an engine housing component, the housing component at least partially defining a first bore for receiving a first shaft and at least partially defining a second bore for receiving a second shaft; and a reinforcement member cast into the housing, the reinforcement member having a lower coefficient of thermal expansion than the housing component, wherein the reinforcement member at least partially surrounds the first and second bores. A method of manufacturing the engine housing assembly is also provided.

A lubricating device for lubricating an internal combustion engine irrespective of orientation, which device comprises a housing that forms a housing part of the internal combustion engine, is, in order to make it possible to reliably lubricate an internal combustion engine, irrespective of orientation, by means of simple constructive means, designed and developed such that a first working chamber for storing lubricant and a second working chamber that is separate from the first working chamber are arranged in the housing, such that a passage is formed from the first working chamber to the second working chamber, such that the second working chamber comprises an opening to a crankshaft receiving area of the housing, and such that the first working chamber comprises a lubricant channel to the crankshaft receiving area, the opening and the lubricant channel being spaced apart from each other in a height direction such that lubricant can be supplied to the crankshaft receiving area, irrespective of orientation, at least via the opening or the lubricant channel.

An actuator of a variable compression ratio mechanism for an internal combustion engine includes an arm link 13 configured to change a posture of the variable compression ratio mechanism for the internal combustion engine by swinging, a second control shaft 11 fixed to the arm link 13, and a housing 20 including a first bearing hole 301a supporting the second control shaft 11. The housing 20 includes a lubricant oil supply oil passage 202 opened to a pressure-receiving range over which a contact pressure is received at the first bearing hole 301a from the second control shaft 11 during an expansion stroke of the internal combustion engine.

A crankshaft lubricating oil passage structure of a V-shaped engine includes a main oil passage and a sub oil passage. The V-shaped engine includes a pair of banks. The pair of banks includes cylinders and is disposed in a V shape with respect to the crankshaft. The V bank angle as an included angle of the cylinders of the respective banks is set at a narrow angle. The main oil passage is provided between the pair of banks in the cylinder block or the crankcase. The sub oil passage extends from the main oil passage to the bearing portion of the crankshaft and guides lubricating oil to the bearing portion. The main oil passage is formed by connecting divided passage portions that are divided partway in an axial direction by an oil passage connection member that is a separate member from the cylinder block or the crankcase.

A media channel assembly for an internal combustion engine includes at least one distribution channel for distributing a medium to various components of the internal combustion engine, and at least one supply channel, which is coupled to the distribution channel by way of at least one media passage opening. At least a wall region of the distribution channel lying opposite the media passage opening is curved, at least in parts, toward the media passage opening. An internal combustion engine includes such a media channel assembly, and a motor vehicle includes such an internal combustion engine.