Distribution plate controlled two-mode engine valve timing changing system

Abstract

The invention discloses two mode engine valve timing variable system controlled by distribution plate, which comprises a hydraulic tappet assembly. One of the hydraulic tappet assembly is pressed with a valve rocker on the top end, and the other end is connected with a camshaft driven by the engine. The system also comprises a hydraulic drive system for driving the telescoping of the hydraulic tappet assembly and an oil-way distribution plate, wherein the hydraulic drive system drives the hydraulic tappet assembly through the distribution plate, and the camshaft is also connected with the distribution plate and controls the conduction of the distribution plate. The invention has simple structure, safety and convenience, long part service life, low cost, little system power consumption, iseasy to realize technical industrialization, can individually control the inlet valve timing or the exhaust valve timing, and also can regulate the inlet vale timing and exhaust valve timing at the same time according to requirement, only need adding one distribution plate. The late close of the inlet vale can realize Miller Cycle, improve the engine efficiency and reduce emission, and realize the function of variable exhaust turbocharging.

Description

technical field [0001] The invention relates to a valve timing and lift variable system of an internal combustion engine. In particular, it relates to a two-mode engine valve timing variable system which can separately adjust the timing of intake and exhaust valves and is controlled by a distributor. Background technique [0002] Since the 1980s, energy and environmental issues have become increasingly prominent, and society has increasingly strict requirements on fuel economy and harmful emissions. How to improve engine performance, increase thermal efficiency and reduce harmful emissions has attracted more and more attention. Improved conventional engines. [0003] The valve timing of the engine plays a vital role in the quality of the combustion process. The selection of valve timing should take into account the engine's high-speed power, low-speed torque, idling fuel consumption, fuel economy under partial load, low-speed stability and exhaust emissions. Traditional p...

AI Technical Summary

Problems solved by technology

Since the intake and exhaust camshafts of high-power diesel engines are divided into two types: "top-mounted" and "side-bottom-mounted", the "side-bottom-mounted" camshaft makes the engine structure simple and the manufacturing cost is low, so it is widely used at present. The exhaust valves are driven by the same camshaft, it is difficult to adjust the intake and exhaust valves separately, so the variable valve technology for high-power diesel engines needs to be developed

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