Improved variable compression ratio piston for internal combustion engine

Abstract

The invention discloses an improved variable compression ratio piston for an internal combustion engine, which relates to an optimization design for a variable compression ratio piston with the publication number of CN101900056A. A mechanically-elastic deformation mechanism in a compression ration adjustment device comprises a circular inclined plane driving disk which is arranged at the central position of the mechanism and an annular incline plane supporting ring which is arranged on the outer side of the circular inclined plane driving disk, wherein steel balls are uniformly distributed ina V-shaped ring slot which is enclosed by the supporting inclined plane of the annular inclined plane supporting ring and the driving incline plane of the circular inclined plane driving disk; elastic reset elements are arranged on the upper sides of the steel balls; and the bottom surfaces of the elastic reset elements are pressed against the steel balls. Compared with a mechanically-elastic deformation mechanism which is not optimized, the mechanically-elastic deformation mechanism eliminates a spring seat disc and can make the elastic reset elements positioned in a force arm alteration state when the steel balls are moved, so that the requirements of high rigidity before the application of pre-tightening force and low rigidity after the application of the pre-tightening force of the mechanically-elastic deformation mechanism can be better met. The piston has a simpler structure and lower cost, is more reliably operated, and has the compression ratio which can also be subjected to quick adaptability alteration along with the working condition of an engine.

Description

technical field [0001] The invention relates to the optimized design of the piston with the publication number CN101900056A and the title of the invention is variable compression ratio piston of internal combustion engine, and specifically refers to an improved variable compression ratio piston of internal combustion engine. Background technique [0002] The cylinder compression ratio has a great influence on the performance of the internal combustion engine. Variable compression ratio technology means that the engine has a higher compression ratio under low-load conditions, and can control the excessively high gas pressure in the cylinder by adjusting the compression ratio under high-load conditions. At present, according to the response speed of the compression ratio changing with the engine operating conditions, the variable compression ratio technology mainly falls into the following two categories: [0003] 1. The compression ratio changes slowly with the engine operat...

AI Technical Summary

Problems solved by technology

For the hydraulic deformation mechanism, due to the high pressure during the actual combustion of the engine, this puts forward high requirements for the hydraulic mechanism and its control system. The existing hydraulic mechanism has complex structures, poor high-temperature sealing performance, and short service life. Defects such as slow response speed and other defects make it difficult to quickly reset the piston after deformation

As far as the elastic deformation element is concerned, the existing elastic deformation elements often use ordinary compression springs, and the stiffness of ordinary compression springs cannot change rapidly with the load conditions in the cylinder, and there is a gap between the upper and lower parts of the piston. Arrangi

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