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Steel top and forged aluminum skirt pistons for locomotive and marine diesel engines

With the development of marine diesel engines is trend to burn heavy oil, to increase the maximum explosion pressure, and to increase the power per liter. Heavy oil contains highly corrosive substances such as phosphorus and sulfur. Usually the entire moving unit needs to be replaced when the ship returns to the port for maintenance, and the maintenance cost is expensive. Increasing the maximum explosion pressure and power raises higher requirements on the strength and fatigue of the piston. We carried out an all-round optimization of the structure, material, process and surface treatment of the piston according to the above characteristics.

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Steel top and cast iron skirt piston for marine diesel engine

Due to the consideration of fuel economy, marine diesel engines are increasingly emphasizing the "applicability of heavy oil" of diesel engines. As a result, the combustion burst pressure and temperature of diesel engines are further increased. The optimization and improvement of the structure and the popularization and application of the new anti-wear and anti-corrosion technology have put forward urgent requirements. In order to fully consider the increase in combustion pressure and gas temperature brought about by the heavy oil used in diesel engines, the piston structure must maintain the stability of small deformation of the piston head and piston skirt, high structural strength and small assembly clearance under high load. We designed the piston structure as a forged steel top and a cast iron skirt, and the two components are connected by bolts to form a combined piston.

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Cast aluminum piston for marine diesel engine

We can provide 160-400 mm diameter high-hardness integral aluminum alloy casting pistons for marine diesel engines. Their general characteristics: the piston ring groove is made of high-hardness, high-nickel-iron material, The application of this material may increase the pressure resistance outside the groove, and at the same time, the internal temperature of the piston can be kept at a constant temperature, which is the better performance of the aluminum skirt. The piston cavity allows an inner cooling oil passage to cool the piston in time to keep the piston optimal Thermal load state; the piston pin hole is lined with high-strength alloy bushings, especially on high-load diesel engines. Since the above three different kinds of materials appear on one piston at the same time, we need to pay more efforts in the process, we use die casting and a series of control methods to ensure that the iron material of the piston ring groove parts and the local aluminum alloy can be tightly attached together, and each piece of piston and every process has undergone our various strict inspections...

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Cast Ductile Iron Pistons for Locomotive Diesel Engines, Marine Diesel Engines and Construction Machinery

Adopting an integrated structure, fully in order to ensure the safe and reliable operation of the diesel engine, we has improved the structural fatigue strength and high temperature fatigue life of materials to meet the requirements of the piston skirt. The requirement of increasing thermal load and mechanical load to improve the reliability of the use of the piston, the thin-walled rib-type iron skirt is adopted. Reinforcing ribs, and then carry out a series of structural optimizations, under the premise of being able to meet the requirements for use...

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Steel top steel skirt for locomotive diesel engine, marine diesel engine and construction machinery

With the continuous improvement of emissions, the overall strengthening of the diesel engine has put forward urgent requirements for the selection and matching of piston materials, the optimization and improvement of the structure, and the popularization and application of new anti-wear and anti-corrosion processes. In order to fully consider the increase in combustion pressure and gas temperature brought about by the use of heavy oil for diesel engines, Jiangsu Yonghang Rail Transit Technology Co., Ltd. designed the piston structure as a forged steel top and a forged steel skirt, and the two components were bolted to form a combined piston.

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