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Continuous variable valve lift mechanism

A technology of valve lift and valve, applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of increasing control difficulty, increasing engine installation space, complex structure, etc., and achieves convenient control, simple structure, and space occupation small effect

Inactive Publication Date: 2013-10-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of this continuously variable valve lift control mechanism is relatively complicated, and a motor dedicated to driving the rocker shaft is fixedly installed on the engine cylinder head, which increases the difficulty of control and increases the installation space of the engine.

Method used

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  • Continuous variable valve lift mechanism
  • Continuous variable valve lift mechanism
  • Continuous variable valve lift mechanism

Examples

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Embodiment

[0018] A continuously variable valve lift mechanism of this embodiment, such as figure 1 As shown, it includes a camshaft 3 , a cam 31 fixedly connected to the camshaft 3 , a valve 2 arranged inside the cylinder 1 , and a valve stem 21 arranged on the valve 2 and extending to the outside of the cylinder 1 . The cam 31 is provided with a slope along the axial direction at the extreme position farthest from the center of rotation of the cam 31, and a valve top cover 4 is movably connected to the top of the valve stem 21, because the outer contour of the valve cover 4 and the cam 31 always maintains a straight line. contact, then if figure 2 As shown, when the axial movement position of the camshaft 3 changes under the drive of the hydraulic device 8, the limit position of the valve rod 21 changes accordingly, so that the lift of the valve 2 in the engine cylinder 1 changes, thereby achieving The purpose of controlling the opening degree of the valve.

[0019] When the cam mov...

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Abstract

The invention discloses a continuous variable lift mechanism which comprises a camshaft, a cam fixedly connected to the camshaft, a valve arranged in a cylinder, and a valve rod arranged on the valve and extending out of the cylinder. The crankshaft can axially move, and an inclined face is axially arranged in a farthest extreme position from the cam rotation center of the cam. A valve top cover is movably connected to the top end of the valve rod, and the valve top cover is contacted with a holding line of the outer contour of the cam. The continuous variable valve lift mechanism is simple in structure, convenient to control as continuous variation of a valve lift can be achieved through axial moving of the camshaft, small in occupied space and particularly suitable for small cars.

Description

technical field [0001] The invention relates to a continuously variable valve lift mechanism. Background technique [0002] The valve lift of the traditional internal combustion engine is fixed and invariable, that is, there is only one cam profile of the cam, which makes it impossible for the lift to make the engine respond well in both high-speed and low-speed zones. With the advancement of science and technology, in order to solve the above problems, the current automobile engine adopts variable valve timing technology (VVT), which can control the opening and closing timing of the intake and exhaust valves according to different working conditions of the engine. The disadvantage is that it can only adjust the opening and closing time of the valve, but cannot control the opening degree of the valve. Then there is variable valve lift (VVL) technology on the market, which can control the opening degree of the valve according to the different working conditions of the engine...

Claims

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Application Information

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IPC IPC(8): F01L13/00F01L1/047
Inventor 于双源应智超沈凯熊树生王英辉
Owner ZHEJIANG UNIV
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