Air valve rocker arm drive device and drive structure of the same name with two air valves and single rocker arm thereof

Abstract

The invention discloses an air valve rocker arm drive device. The device comprises a gap bridge and a rocker arm, wherein the lower surfaces of the two ends of the gap bridge are provided with an air valve respectively, the two air valves are arranged in parallel with each other, and the lower surface of the gap bridge is fixedly connected with a gap bridge guide rod; the axis of the gap bridge guide rod is in parallel with the axis of the air valve, the upper surface of the gap bridge is provided with a contact surface, and one end of the rocker arm is in contact with the gap bridge through the contact surface. The invention further discloses a drive structure of the same name with two air valves and single rocker arm. The structure comprises an air inlet valve drive device, an air outlet valve drive device and a camshaft, wherein the air inlet valve drive device and the air outlet valve drive device are all air valve rocker arm drive devices, and the camshaft is provided with an air inlet camshaft and an air outlet camshaft; the air inlet camshaft and the air outlet camshaft are each provided with a tappet in a driving matched mode, and the tappet is connected with the rocker arm through a tappet rod. According to the drive structure, through the single rocker arm, the two valves can be driven to simultaneously open and close, so that the drive structure is simpler, the mechanical execution efficiency is higher, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to a valve rocker arm drive device and a two-valve single-arm drive structure with the same name. Background technique [0002] The general-purpose small engines commonly used in motorcycles, generators and other devices usually adopt a single-cylinder or two-cylinder structure, and the main forms of its gas distribution system are lower camshaft, overhead camshaft transmission system and two-valve, four-valve structure. The arrangement and structure of the above two valve trains adopted by this type of small engine are mature in technology, reliable in operation and low in manufacturing cost. A rocker arm controls the opening and closing of a valve. One end of the rocker arm directly acts on the top of the valve. Due to the swing of the rocker arm, the direction of the force it exerts on the valve is along the tangential direction of the swing of the rocker arm and does n...

AI Technical Summary

Problems solved by technology

A rocker arm controls the opening and closing of a valve. One end of the rocker arm directly acts on the top of the valve. Due to the swing of the rocker arm, the direction of the force it exerts on the valve is along the tangential direction of the swing of the rocker arm and does not coincide with the direction of the valve. The direction of movement is the same, so that a lateral force will be applied to the valve, and the valve will be worn with the cylinder under this force, which will cause a gap between the valve and the cylinder, so that the valve will leak and will The noise when the engine is running becomes louder, the engine power is insufficient, the speed increases slowly, the fuel consumption increases, and it is difficult to start the hot car.

In addition, there are certain shortcomings in the layout and structure of the above two kinds of valve trains. The gas charging efficiency of the lower camshaft gas distribution system engine is low, and the contact position between the tappet and the intake and exhaust cams is not ideally lubricated; Many, long power transmission lines, poor high-speed performance

Although the overhead camshaft air distribution transmission system has high inflation efficiency, it has high requirements for the space layout of the cylinder head, and there are many parts in the power transmission mechanism, the transmission belt (chain) needs to be tensioned, the structure is complicated, and the manufacturing cost is high.

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