Continuously variable valve lift system

Abstract

The invention discloses a continuously variable valve lift system, which relates to the field of engine valve design; the continuously variable valve lift system comprises a first rocker arm; the bottom side of a first end of the first rocker arm is in contact with a valve and can push the valve; the bottom side of a second end of the first rocker arm is supported by a hydraulic tappet; the continuously variable valve lift system further comprises a second rocker arm which is used for pushing the first rocker arm and driven by a fixedly arranged driving cam; the second rocker arm is arranged on an eccentric wheel and uses the center of the eccentric wheel as rotation center; the position of the rotation center of the second rocker arm is changed; correspondingly, directions and sizes of a power arm and a resisting arm as well as an angle between the second rocker arm and a horizontal plane are changed; and then the rotation quantity of the first rocker arm is driven to be changed; and finally, the lift of the valve in contact with the first rocker arm is changed; and according to the invention, problems of incomplete performance, complicated structure and expensive manufacturing cost of a lifting engine of the traditional valve lift system are solved.

Description

technical field [0001] The invention relates to the field of engine valve design, in particular to a continuously variable valve lift system. Background technique [0002] For a traditional gasoline engine, the valve lift is fixed, and the engine load is adjusted by controlling the throttle opening. Such a control method causes the engine to have a large pumping loss, especially under partial load, the pumping loss is more serious, which will greatly affect the performance of the engine. [0003] Therefore, major international automobile groups have invested a large amount of funds and manpower in the research and development of variable valve lift technology. At present, the continuously variable valve lift technology can change the valve lift according to the operating conditions of the engine, so that the throttle valve is always within a relatively large opening range, which can effectively reduce fuel consumption and emissions, and improve engine power and torque. fea...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of continuously variable valve lift system, which solves the problems of incomplete engine performance improvement, complex structure and high cost of current valve lift systems.

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