Piston and piston rings bushing

Bearing piston and piston ring is located in the heart of the engine, which directly affect the quality of work of the engine. Modern multi-engine piston aluminum alloy as a material. Its main advantage is good quality light two thermal conductivity. Piston and piston ring is a pair of friction. To make it work to achieve the best performance, in terms of selection of raw materials and face coating material, it should first consider the matching between the two. Such as: chemical passivation piston ring end face, the piston should be used AEB5 type eutectic aluminum (5% content of Cu) as the material, and on the piston ring groove phosphating. With the continuous improvement of engine power and the piston continues to extend the working life of ordinary aluminum piston difficult to meet the requirements of many better performance of new material applied to the piston. Performance aluminum matrix composite materials have reached the best use of Ni-resist cast iron levels, while after the pistons and rings made of quality greatly reduced compared with the conventional aluminum alloy high temperature strength and thermal fatigue resistance improved significantly , and has a low coefficient of linear expansion. Can increase piston life, reduce fuel consumption and exhaust emissions, improve engine power. Toyota Motor Corporation's engines Pat extensive use of this material, the US company has developed a graphite foam for the production of automobile engines include plug. Sliding bearing having four times higher than that of aluminum, copper than five times higher heat transfer coefficient, and relatively low density, light weight, and high cost is not prepared to take, can reduce the mass of 40% (compared to gold scrap lumber) , but also for cooling refrigeration, can effectively increase the engine power output, improve work efficiency.
Ductile iron normalizing materials past been used to improve strength. With mature production technology, pearlite cast ductile iron crankshaft gradually replaced by normalizing ductile iron crankshaft. Due to the increased number of graphite nodules, full-pearlite matrix organization, which can be cast at the discretion of higher mechanical properties. Cast crankshaft without normalizing heat treatment, only simplifies the production process, reducing energy consumption and production costs, but also to avoid the generation of internal stresses human factors, thereby reducing the tendency of the deformation of the crankshaft after the machining surface of the quench hardening treatment. In EQl092 automotive crankshaft production, for example, as long as the cast matrix pearlite content of less than 75%, is higher than the hardness of the journal surface hardening platinum HRC, the amount of deformation of less than 0.3mm, while the original normalizing ductile iron crankshaft, surface after quenching, the crank deformation of large and unstable, average 15ma, the maximum reach 3.5mm.