Variable valve lift device of engine

Abstract

The present invention relates to a variable valve lift device of an engine, including: a first body performing a rotary motion within a previously established angle range by a rotary motion of a high speed cam combined to a cam shaft; a second body which is connected to or separated from the first body, and controls lifting amount of the valve by performing a rotary motion by the rotary motion of the high speed cam when the second body is connected to the first body, and by performing the rotary motion by a rotary motion of low speed cams prepared at both sides of the high speed cam when the second body is separated from the first body; a latching pin combined to be able to appear or disappear toward the first body by passing through the second body so as to connect or separate the first body and the second body; a driving module operating the latching pin to appear or disappear; a rotary shaft which is arranged on an upper part of the valve and is installed to cross both side walls of the first body and the second body; and a return spring which is installed on the rotary shaft.

Description

technical field [0001] The present invention relates to a variable valve lift device for an engine, and more particularly, to a variable valve lift device for an engine that controls the lift of a valve according to driving conditions of a vehicle. Background technique [0002] The valve mechanism for automobile engines supplies mixed gas to the combustion chamber and discharges combustion gas according to the stroke of the engine. [0003] Recently, variable valve opening ratios or opening and closing timings of valves have been developed to optimize the inflow and exhaust efficiency of the combustion gas by changing the engine operating conditions, i.e., the operating range of the engine distinguished by the engine speed and load. valve mechanism and adapt it to the engine. [0004] Thus, the variable valve mechanism for an automobile engine can improve engine performance such as fuel economy, torque, output, etc., and reduce the amount of exhaust gas. [0005] The above...

AI Technical Summary

Problems solved by technology

[0019] However, Patent Document 4 and Patent Document 5 include the compression spring to restore the rotational movement of the first body, and the first body requires additional head processing.

[0020] Therefore, Patent Document 4 and Patent Document 5 will reduce the workability of the production work due to the additional head processing work, and it is difficult to apply to the engine of the actual vehicle.

[0021] However, in Patent Document 4 and Patent Document 5, the rotational motion of the cam is transmitted to the sliding type first body to adjust the lift amount of the valve, and a power loss due to friction occurs between the first body and the cam, thereby reducing the speed of the vehicle. fuel economy

[0022] In addition, in Patent Document 4 and Patent Document 5, since the pivot point as the rotation center of the first body is formed on the drive module side, the weight and inertial force increase, thereby reducing the uniqueness.

[0023] In addition, in Patent Document 4 and Patent Document 5, as an additional lock spring is provided to provide a restoring force to the lock pin, the number of parts increases, workability is reduced, and there is a problem that manufacturing costs increase.

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