Стендовые испытания нового уплотнения деталей цилиндропоршневой группы судового ДВС

Abstract

The engine consists of a large number of parts, each of which is responsible for a specific function of its efficient operation. The reliability of a marine diesel engine is largely determined by the resource of its individual components and parts. Therefore, in order to increase the engine life, it is necessary to allocate the most responsible parts in it, which are subject to greater wear and find solutions to increase their durability. Such details include piston rings, which affect not only the technical and economic performance of the engine, but also its reliability and environmental performance. Of the entire set of sealing parts of the cylinder-piston group, the upper piston compression ring should be distinguished as the most loaded. The main function of piston rings is noted – the creation of tightness of the combustion chamber. The passage of exhaust gases is inevitable due to the presence of a “lock” in the structure, and during operation, the wear of the piston rings leads to an increase in it, which affects fuel consumption, oil, and a decrease in engine power. One of the most negative consequences of piston ring wear is the appearance of “flutter” type vibration, which leads to the destruction of not only the ring, but also the edges of the piston grooves, especially on aluminum pistons. Worn grooves are not repaired by resorting to replacing pistons. A method for extending the service life is proposed, which consists in the use of a new sealing unit for cylinder piston group parts. The new sealing unit allows you to extend the piston's operability by boring the upper piston groove of the piston until all chips are eliminated. The operability of this node and the effectiveness of the seal was confirmed by an experiment that was conducted on the stand in conditions close to real ones. A technology for restoring the operability of pistons made of aluminum alloys is proposed.