Piston, and piston copper bush installation method and installation device

Abstract

The invention relates to a piston, and a piston copper bush installation method and installation device. The piston includes a piston body and a copper bush; pin boss holes and a pin boss crotch are formed in the piston body; clamping bosses are arranged on the copper bush; clamping grooves are formed in the pin boss holes; the clamping bosses and the clamping grooves are snapped onto each other; and the copper bush and the pin boss holes form an interference fit. The installation method includes: S1, performing cleaning and drying; S2, performing freezing; S3, performing positioning; S4, performing jacking and translating; S5, jacking the copper bush into a corresponding pin boss hole; S6: performing demounting; and S7: keeping a circulation from the step S3 to the step S6. The installation device includes a copper bush clamp, a copper bush positioning jacking member, a piston positioning member, copper bush pushing members and a rack; the rack includes two side plates, a bottom plate, an intermediate plate and a top plate; the piston positioning member is connected to the top plate; a stopping disc is arranged in the intermediate plate; the copper bush positioning jacking member is connected to the bottom plate; the copper bush clamp is positioned on the top of the copper bush positioning jacking member; and the copper bush pushing members are connected to the two side plates respectively. The installation device is unique, simple and reliable in structure, and can effectively eliminate failure risk due to falling of copper bushes.

Description

technical field [0001] The invention mainly relates to the technical field of internal combustion engines, in particular to an installation method and installation equipment for a piston and a piston copper sleeve. Background technique [0002] The piston is an important part of the internal combustion engine, and it is subjected to high temperature and high pressure and repeated alternating mechanical and thermal loads in the working process. With the continuous improvement of engine power, higher requirements are put forward for the wear resistance and bearing capacity of the piston pin hole. At present, many domestic diesel engine pistons use interference fit to inlay copper sleeves in the piston pin seat hole to improve the piston. The wear resistance and load-bearing capacity of the pin hole prevents engine failure caused by cracking of the pin seat. [0003] The method of inserting the copper sleeve in the hole of the piston pin seat is to heat the piston by the hot-l...

AI Technical Summary

Problems solved by technology

[0004] The existing technology of inserting copper bushings in the piston pin seat holes, whether it is assembled by hot-fitting or cold-fitting, has greatly improved the bearing capacity of the pin holes. The risk always exists. Major failure modes such as the copper sleeve falling off towards the cylinder liner, damage to the cylinder liner and the cylinder block, causing the engine to be scrapped, are difficult to completely eliminate

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