Stepless variable-valve-lift mechanism

Abstract

The invention provides a stepless variable-valve-lift mechanism. The stepless variable-valve-lift mechanism comprises a driving cam, a rocker arm, air valves, tappets and a rotating driving device, wherein each air valve comprises an air valve lifter, the air valves and the tappets are located on the same side of the rocker arm and located at two ends of the rocker arm, top ends of the tappets abut against the rocker arm, the driving cam is located on the other side of the rocker arm, and the rotating driving device is connected with the tappets and is used for driving the tappets to rotate, so that included angles formed by axes of the tappets and axes of the air valve lifters are changed. The stepless variable-valve-lift mechanism is ingenious in design, simple in structure, easy to implement, low in cost and capable of being widely used for high-grade, middle-grade and low-grade cars.

Description

Technical field [0001] The invention relates to the technical field of automobile engines, and particularly relates to a stepless variable valve lift mechanism. Background technique [0002] With the rising oil prices, people's increasing attention to environmental protection, and increasingly stringent emission regulations, engines with low pollution, low fuel consumption, high power, and high torque have become the goals pursued by the automotive industry. However, the existing valve train severely restricts the combustion characteristics and emission performance of the engine. [0003] The valve that controls the charge exchange process of the engine has three main characteristic parameters: valve opening phase, valve opening continuous angle (crankshaft angle during which the valve remains open) and valve lift. These three characteristic parameters have an important influence on engine performance, fuel consumption, and emissions. Generally, the valve opening phase and the va...

AI Technical Summary

Problems solved by technology

The fully variable mechanism currently used is also a new technology in recent years. They also realize the function of continuously variable valve lift through a series of mechanical or hydraulic mechanisms, but the valve mechanism currently used usually requires a special one. Level control arm, or increased cam mechanism, which makes the mechanism more complicated and expensive, so it is mostly used in high-end cars, and it is difficult to popularize in middle and low-end cars

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