Variable timing system of engine valve

Abstract

The invention discloses a variable timing system of an engine valve. The variable timing system comprises a cylinder cover, a valve, a cam and a control mechanism, wherein the valve is arranged on the cylinder cover and driven by the cam to move; the cam is in rotary connection with the cylinder cover in an axially sliding manner; the projection of bulge parts of the cam in the cam axial direction is not overlapped completely; the control mechanism is connected between the cam and the cylinder cover, and used for driving the cam to slide axially and carrying out axial location to the cam. The variable timing system of the engine valve, with improvement of the cam shape and the installing structure thereof, enables the opening time of the valve to be changed, realizes variable timing, is simple in structure, good in running stability, and beneficial to save cost.

Description

technical field [0001] The invention relates to an engine timing system, in particular to an engine valve variable timing system. Background technique [0002] The engine valves are opened and closed by crankshaft power and chain sprocket transmission. During the intake stroke, the piston sucks air into the cylinder for fuel injection and combustion. The expanding gas pushes the piston to move and do work to generate power, and then discharges the combustion exhaust gas to measure the engine power. The size parameter is "displacement", engine displacement = cylinder working volume × number of cylinders, in theory, the larger the cylinder volume, the more air intake, the greater the output power, but the actual situation is that the intake process will be affected The direct impact of the opening and closing conditions of the valve, the variable valve control device in the prior art, when the engine is running at low speed, reduces the opening of the valve by controlling the ...

AI Technical Summary

Problems solved by technology

[0002] The engine valves are opened and closed by crankshaft power and chain sprocket transmission. During the intake stroke, the piston sucks air into the cylinder for fuel injection and combustion. The expanding gas pushes the piston to move and do work to generate power, and then discharges the combustion exhaust gas to measure the engine power. The size parameter is "displacement", engine displacement = cylinder working volume × number of cylinders, in theory, the larger the cylinder volume, the more air intake, the greater the output power, but the actual situation is that the intake process will be affected The direct impact of the opening and closing conditions of the valve, the variable valve control device in the prior art, when the engine is running at low speed, reduces the opening of the valve by controlling the position distance between the crankshaft and the camshaft to provide less gas , when the engine runs at high speed, the control device restores the valve opening to provide more gas, and realizes the economical operation of the internal combustion engine in this way. The valve control device complicates the internal structure of the engine and increases the cost of use

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