Continuous variable valve mechanism

Abstract

The invention discloses a continuous variable valve mechanism, and belongs to the field of engine valve driving. The continuous variable valve mechanism comprises a cam, a valve assembly, a rocker arm, a rocker arm support point, an adjustable rocker arm, an eccentric wheel, a rail and the like. According to the continuous variable valve mechanism, a molded line of a non-working section in a working curved surface of the adjustable rocker arm is an arc (the radius is R2) with a circle center of an adjustable roller (the radius is R3) on the adjustable rocker arm as a circle center, a molded line of a working curved surface of the rail is an arc (the radius is R1) with a circle center of an output roller (the radius is R4) on the rocker arm as a circle center, and the R1 is equal to the sumof the R2, the R3 and the R4. By controlling the phase position of the eccentric wheel, different valve lift curves are achieved, and the aims of low oil consumption, low discharging and high power outputting are achieved; during working or adjusting, good contact between all parts is kept, intervals or redundancy can be avoided, and impacting or the condition that a valve cannot be completely closed can be avoided, the reliability of the mechanism is improved, running noise is reduced, and reliable running of an engine is guaranteed.

Description

technical field [0001] The invention relates to a continuously variable valve mechanism, which belongs to the field of engine valve driving. Background technique [0002] With the rapid increase of the number of engines, energy and environmental issues have become one of the major issues restricting my country's sustainable development. Because of its ability to effectively reduce engine fuel consumption and emissions, variable valve technology has attracted much attention. Studies have shown that the higher the valve flexibility, the higher the engine performance improvement. Currently, continuously variable valve (CVVL) technology has been applied to mid-to-high-end vehicles. In the design of a high-performance CVVL mechanism, the following requirements must be met: whether it is working or adjusting, when the base circle segment of the cam is in contact with subsequent components, each component should maintain good contact without gaps or redundancy. If there is a gap...

AI Technical Summary

Problems solved by technology

If there is a gap, there will be repeated shocks during operation, which will greatly reduce the structural strength and reliability, and increase the running noise level; if there is redundancy, the valve cannot be completely closed, which will cause air leakage and deterioration of engine performance. Even affect the life of the engine

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