Bombardier Recreational Products Inc.

Bombardier Motor Corporation of America

David F Haman

Peter E Lucier

Richard P Kolb

Richard M McChesney

Gregory D Irwin

Richard T Tunkieicz

Robert L Bastrup

Scott D Clements

The present invention is directed to a lubrication system for a multi-cylinder internal combustion engine. An inter-cylinder lubricant communications system is provided to circulate lubricant from an upper-most cylinder to each successive cylinder downstream. This system includes an inlet that extends through an opening in the wall of a downstream cylinder. An outlet situated upstream relative to the inlet is also provided and includes an accumulation region to collect lubricant as it flows with the charging air from the crankcase chamber to the combustion chamber of an engine cylinder. A fluid passage is configured to fluidly interconnect the inlet to the outlet to pass lubricant from the upstream cylinder to the downstream cylinder. A passage is provided from the most downstream cylinder to the most upstream cylinder thereby allowing for re-circulation of the lubricant. The system takes advantage of a pressure differential between any two successive cylinders to draw the excess oil from one cylinder to the next.

Method and apparatus for inter-cylinder lubrication transfer in a multi-cylinder internal combustion engine

A cylinder block assembly for an internal combustion engine having a cylinder block and a plurality of cylinders includes an oil port in each of the cylinders. An annular groove is located in each cylinder wall so that oil flowing from the oil port flows into the annular groove to lubricate the skirt of the piston. An opening may be located in the piston so that oil flowing from the oil port flows into and through the piston opening when the piston is at a predetermined position, thereby directly injecting oil into the piston to lubricate the wrist pin of the piston.

Oil injection system

The present invention, in one aspect, is a cooling system for a marine engine and includes cylinder cooling jackets, cylinder head cooling jackets, and thermostatic and pressure controls which facilitate safely operating the engine with low water flow rates. In one specific embodiment, the cooling system is employed in a marine engine including a V-type cylinder block with two cylinder banks and a valley between the banks. Each cylinder bank includes a plurality of cylinder bores (e.g., each cylinder bank includes three cylinder bores in a six cylinder engine), and respective exhaust ducts extend from and are in flow communication with each cylinder bore. Respective coolant flow paths extend from the valley to a section of each cylinder bore water jacket adjacent each cylinder exhaust duct. Specifically, water is provided from the valley to adjacent each exhaust duct in the cylinder banks. Each cylinder bore water jacket includes an outlet at an upper portion of each said cylinder bank. A water flow path extends from each cylinder bore water jacket outlet to a respective cylinder head water jacket. Variable thermostats are in flow communication with each cylinder bore water jacket, and each thermostat is in flow communication with a dump. Each flow path through the respective thermostats is in parallel with a respective cylinder head. The thermostats allow cooling of the cylinders to be thermostatically controlled. Specifically, the amount of water supplied to the cylinder head cooling jackets depends on the temperature condition at the thermostats. The cylinder head water jackets are in flow communication with a parallel connected blow off valve and thermostat. The blow off valve and thermostat are in flow communication with the water dump. When the blow off valve opens, maximum cooling is provided in that water flows unrestricted from the valley, to the cylinder cooling jackets, to the cylinder head cooling jackets, through the blow off valve to the dump.

Marine engine cooling systems and methods

An engine in which the cylinders are scavenged according to a cross scavenging technique. The engine includes one or more cylinders in each of which a piston is disposed for reciprocal motion. The engine further includes a direct fuel injection system that allows controlled input of fuel into each cylinder to promote more efficient operation of the cross scavenged engine.

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Palm City, FL, United States of America

David F Haman