Spray oil cooling for large bore pistons - InKoMar

The joint project “InKoMar – Innovative cost- and emission-optimized lightweight piston development for the gas operation of large maritime dual-fuel engines” consisting of WTZ Roßlau gGmbH, MET Motoren- und Energietechnik GmbH and Seco GmbH has the project objective of developing a new design concept for future large engine pistons in the gas operation of dual-fuel engines in the maritime sector. The complicated and costly lubricating and cooling oil supply via the crankshaft and connecting rods is to be replaced by a simple spray oil supply via a nozzle, which will significantly reduce the manufacturing costs. In addition, the weight of the crankshaft and connecting rod can be reduced, which reduces the moving masses and thus increases the efficiency of the engine. Until now, this simple spray nozzle oil feed has not been available for large engine pistons. The new spray oil feed is to be combined with a friction-welded connection between the upper and lower piston sections, the combustion chamber shape of the piston is to be adapted to dual-fuel gas operation, and the entire assembly is to be of extremely lightweight design.