Engine and actuating mechanism of variable valve lift device thereof

Abstract

The invention discloses an engine and an actuating mechanism of a variable valve lift device thereof. The actuating mechanism comprises a first hydraulic valve block, a first driving rod, a second driving rod, an elastic resetting device and an elastic piece, wherein the first hydraulic valve block is internally provided with a first valve cavity and a second valve cavity which are the same in shape and are mutually communicated, and the first valve cavity and the second valve cavity are filled with liquid; one end of the first driving rod extends into the first valve cavity from one end of the first valve cavity, the first driving rod and the first valve cavity are in sealing fit and can relatively move, and a first shifting fork is arranged on the first driving rod; one end of the second driving rod extends into the second valve cavity, the second driving rod and the second valve cavity are in sealing fit and can relatively move, and a second shifting fork is arranged on the second driving rod; the elastic resetting device is positioned at the other end of the first driving rod; and the elastic piece is elastically abutted between a first cam and a second cam. The actuating mechanism disclosed by the invention has the advantages of simple structure, reliable control and high precision.

Description

technical field [0001] The invention relates to the technical field of automobile construction, in particular to an actuating mechanism for a variable valve lift device of an engine. Background technique [0002] In the valve drive mechanism of traditional engines, the valve timing is generally determined based on the local optimization of a narrow operating range of the engine, which is fixed during the working process, and the valve movement law is completely determined by the cam profile. However, the traditional gasoline engine has a single cam profile and cannot adjust the intake air volume according to the engine load. The valve operating parameters of the traditional engine valve train are also fixed, and the determination of the parameters depends on the designed operating point. [0003] The existing non-continuously variable valve lift structure has a single lift mode, which cannot realize most of the working conditions of the engine, and the fuel saving effect is...

AI Technical Summary

Problems solved by technology

[0003] The existing non-continuously variable valve lift structure has a single lift mode, which cannot realize most of the engine's working conditions, and the fuel saving effect is not obvious

However, the existing continuously variable valve lift technology has high cost of parts and complex structure, and requires high reliability of each part. The design of the engine cylinder head is more difficult, especially the structure of the actuating mechanism is more complicated, and its adjustment The process is not easy to control and the adjustment accuracy is poor

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