Continuous variable valve timing adjusting system for internal combustion engine

Abstract

The invention provides a continuous variable valve timing adjusting system for an internal combustion engine, belonging to the technical field of internal combustion engines. The system comprises a crankshaft, a cam shaft, a cam, a driving gear, an intermediate gearing, an input center gear, a differential gear, a differential gear carrier, an adjusting center gear and an adjusting device, wherein the front end of the crankshaft is installed at the axle center of the driving gear; the intermediate gearing is meshed with the driving gear and an outer gear ring of the input center gear respectively; the differential gear is meshed with an inner conical gear ring of the input center gear and the adjusting center gear respectively; the differential gear carrier passes through a differential gear sleeve and is connected with the cam shaft into a whole; and the adjusting device is coaxially connected with the adjusting center gear. In the working process of the system, when the adjusting center gear rotates in a certain direction, the rotating speed of the differential gear carrier is increased or decreased, thus changing the rotation phase between the cam shaft and the crankshaft and realizing adjustment of valve timing. The system has reasonable design, simple structure, good reliability and higher adjustment precision and is easy to add on the original engine.

Description

technical field [0001] The invention relates to a valve adjustment system in the field of internal combustion engines, in particular to a continuously variable valve timing adjustment system for internal combustion engines. Background technique [0002] Energy saving and emission reduction is a major topic of common concern in the field of internal combustion engines. The valve timing of the engine directly affects the charging efficiency of the engine, and thus has a very important impact on the combustion process in the cylinder of the engine. The variable valve timing technology optimizes the charge into the cylinder by adjusting the valve timing of the engine under different operating conditions, thereby improving the power and economy of the engine. The ideal valve timing law should be able to adjust properly in time according to the change of engine operating conditions, and this adjustment should be continuous and have sufficient flexibility. When the engine rotates...

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Problems solved by technology

[0003] Through the retrieval of prior art documents, it is found that the patent application number is 200610069982.5, the publication number is CN1959072, and the name is an invention patent of a continuously variable valve timing system for an internal combustion engine controlled by electro-hydraulic control. In its specific embodiment, it can only It is difficult to control the valve opening time by controlling the falling and closing time of the valve, and the reliability and adjustment accuracy are difficult to guarantee

The patent application number is 200610169984.1, and the publication number is CN101182807, which is an invention patent named continuously variable valve lift device, which realizes continuous adjustment of valve lift and valve timing, but its structure is complex and there are too many followers. Reliability is difficult to guarantee, and it is difficult to install on the original engine

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