Steel crown and aluminum skirt combined type piston for diesel engine

Abstract

The invention discloses a steel crown and aluminum skirt combined type piston for a diesel engine. The steel crown and aluminum skirt combined type piston comprises a piston head, a piston skirt, a connecting bolt, a piston skirt and other parts, a copper bush is not adopted in a piston skirt pin hole which is designed into a special pin hole, namely, the shape of the piston skirt pin hole is a combination of a column section and a flaring section, the spacing between clamping ring grooves on the piston skirt pin hole is lengthened to reach 220-240mm, and the length of a piston pin matched with the piston skirt pin hole is lengthened, and the contact stress borne by the pin hole is reduced through increasing the contact area between the piston pin and the piston skirt pin hole. The invention has the advantages of simplifying the structure of the piston skirt pin hole, reducing the risk of unstable quality of the piston and avoiding jumping of the piston in an applying process, and is suitable for railway transportation.

Description

technical field [0001] The invention relates to the technical field of combined pistons for diesel engines. Background technique [0002] At present, there is a steel head aluminum skirt combined piston for diesel engine, the structure is as follows figure 1 shown. It consists of piston head, piston skirt, elastic sleeve, connecting screw, O-ring and bushing. The piston head and the piston skirt are connected by 4 screws, and the connecting screw passes through the piston skirt and the elastic sleeve from the bottom of the skirt, and is screwed into the threaded hole of the piston head. During the use of the piston, in order to improve the strength and service life of the pin hole of the piston skirt, a copper bushing is added to the structural design of the pin hole. However, during the use of the piston with this design structure, because the piston skirt pin hole and the bushing are assembled together through interference, this puts forward higher requirements for the ...

AI Technical Summary

Problems solved by technology

The movement of the bushing will lead to poor oil passage and poor cooling of the piston, which will cause the overall temperature of the piston to be too high

If the fault occurs lightly, it will cause the piston to pull the cylinder, and if it is serious, it will cause serious damage to the diesel engine, which seriously affects the safety of railway transportation.

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