Two-stage variable valve lift mechanism for internal combustion engine

Abstract

The invention provides a two-stage variable valve lift mechanism for an internal combustion engine, and is applied to the technical field of automobile engines (internal combustion engines). An adjusting part B(7) of the two-stage variable valve lift mechanism for the internal combustion engine is machined and formed by using an MIM process; an adjusting part A(6) is machined and formed; a valve pin B(3) is arranged in a structure which can act on the adjusting part B(7) to drive a shaft sleeve B(5) to axially move leftwards relative to a spindle (1); and the valve pin B(3) is also arranged ina structure which can act on the adjusting part A(6) to drive a shaft sleeve A(4) to axially move rightwards relative to the spindle (1). According to the two-stage variable valve lift mechanism forthe internal combustion engine, the cam state switching of an engine can be accurately realized, the engine can more scientifically complete combustion and work in the optimal working state under different working condition requirements, and the heat efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile engines (internal combustion engines), and more specifically relates to a two-stage variable valve lift mechanism for internal combustion engines. Background technique [0002] As the power machinery with the highest thermal efficiency and the most widely used at present, the internal combustion engine generates 90% of the total power of power plants used in the world, and is the main consumption channel of petroleum energy in the world. On the one hand, as the number of cars increases, the oil consumption of internal combustion engines will increase rapidly, and the contradiction between oil supply and demand will inevitably become increasingly serious. While consuming a large amount of energy, internal combustion engines are also the biggest source of pollution to the atmospheric environment, especially in cities. Innovating internal combustion engine technology is of great significance for s...

AI Technical Summary

Problems solved by technology

In traditional internal combustion engines, the valve lift is fixed, which leads to the same valve lift opening regardless of the heavy load or light load conditions, resulting in energy waste and low thermal efficiency

The structure of the variable valve lift mechanism in the prior art is complicated

And when working, it is impossible to accurately and effectively complete the cam state switching

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