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 parts of internal combustion engines. A cam sleeve (2) of the two-stage variable valve lift mechanism for the internal combustion engine is movably arranged on a cam shaft (1) in a sleeve mode, an electromagnetic valve (3) is connected with a control component capable of controlling telescopic switching of a valve element A (6) and a valve element B (7), a guide groove surface A (9) of a guide groove (8) arranged in the cam sleeve (2) comprises a surfaceA linear part I (11), a surface A C-shaped curve part (12) and a surface A linear part II (13), and a guide groove surface B (10) comprises a surface B linear part I (14), a surface B curved part (15)and a surface B linear part II (16). According to the two-stage variable valve lift mechanism for the internal combustion engine, the structure is simple, the relative position of the cam shaft and the cam sleeve can be conveniently and reliably adjusted, two-stage adjustment of a valve lift cam is realized, so that the internal combustion engine can be guaranteed to always work under the optimal working condition.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine components, 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. With the increase of car ownership, 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 the urban atmospheric environment. This shows that innovation Internal combustion engine technology is of great sig...

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 variable valve lift in the prior art has the following defects: 1. The structure is complex, the structure of the guide groove is relatively complicated, and the processing cost is high; 2. The response speed of the variable valve lift technology of the two-stage roller rocker arm structure is slow ( hydraulic control)

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