Valve driving apparatus

Abstract

Disclosed herein is a valve driving apparatus. The valve driving apparatus includes at least one swing arm having one side corresponding to an upper side of a valve opening and closing a combustion chamber of an internal combustion engine; and a cam unit periodically pivoting the swing arm. Here, the swing arm performs a swing motion on the other side thereof by external manipulation to periodically compress the valve. The valve driving apparatus is capable of adjusting lift amounts of valves opening and closing a combustion chamber of an internal combustion engine.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit under 35 U.S.C. §119 of Korean Patent Application No. 10-2008-0113562, filed Nov. 14, 2008, which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a valve driving apparatus and, more particularly, to a valve driving apparatus that is capable of continuously adjusting lift amounts of valves opening and closing a combustion chamber of an internal combustion engine with a double-cam unit to provide optimum fuel economy and output.[0004]2. Description of the Related Art[0005]In general, an internal combustion engine of vehicles includes a combustion chamber in which fuel is burned to generate power. The combustion chamber is provided with a valve train, which includes intake / exhaust valves controlling the flow of intake and exhaust gases and is associated with a crankshaft to open and close the combustion cham...

AI Technical Summary

Benefits of technology

[0010]The present invention is conceived to solve the above problems of the related art, and an aspect of the invention is to provide a valve driving apparatus that is capable of precisely adjusting lift amounts of valves periodically opening and closing a combustion chamber of an internal combustion engine with a double-cam unit associated therewith in order to achieve optimum fuel economy and output.

Problems solved by technology

Thus, with a design contemplated for low speed driving conditions, time and degree of valve opening are insufficient in high-speed drive conditions, and with a design contemplated for the high speed drive conditions, a reverse phenomenon occurs in the low speed drive conditions.

More specifically, since a general internal combustion engine tuned for high speed driving is set to have a high valve lift value, it exhibits good performance under high-speed conditions, but is very disadvantageous in terms of idle stability and low-speed torque characteristics under low speed conditions.

On the contrary, the engine tuned for low speed driving provides good idle stability and low-speed torque under low-speed conditions but exhibits limited performance under high-speed conditions.

In a conventional variable valve lift-type valve driving apparatus, however, since the lift amount of the valve cannot be varied and time of opening or closing the intake or exhaust valve is fixed in a constant state, the amount of intake or exhaust air cannot be adjusted, so that optimum fuel economy and output cannot be obtained corresponding to an engine operation state.

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