Four-stroke gasoline engine

Abstract

The invention discloses a four-stroke gasoline engine. The technical scheme of solving technical problems is as follows: a crank shaft is provided with a drive sprocket, a cam shaft is arranged on an air cylinder head assembly, the cam shaft is provided with a driven sprocket, an inlet valve rocking arm and an exhaust valve rocking arm are arranged on the same drive shaft on the air cylinder head assembly through inner holes and swings around the central line of the drive shaft; the cam shaft central line, the crank shaft central line and the drive shaft central line are parallel, and the other ends of the inlet valve rocking arm and the exhaust valve rocking arm are respectively contacted with a cam on the cam shaft; a drive chain is arranged between the drive sprocket and the driven sprocket, and the gear ratio of the drive sprocket and the driven sprocket is 1:2; and the corresponding parts of an engine body assembly and the air cylinder head assembly are respectively provided with a cavity through which the chain passes, and the two opposite sides of the engine body cavity are respectively provided with a chain tightener and a chain guide block. The four-stroke gasoline engine provided by the invention has the advantages of light weight, small noise, good dynamic property and economical efficiency.

Description

technical field [0001] The invention relates to the technical field of gasoline engines, in particular to a four-stroke gasoline engine. Background technique [0002] In the four-stroke gasoline engine of the prior art, the crankshaft is provided with a driving gear, the camshaft is arranged in the engine body cavity, the camshaft is provided with a driven gear, and the tappet, the plane at the lower end of the tappet and the camshaft are arranged in the inner hole of the body. The curved surfaces are in contact with each other and make reciprocating linear motion with the rotation of the camshaft; the inner cavity of the cylinder head is equipped with an intake rocker arm and an exhaust rocker arm, and the cylinder head is equipped with a tappet and the valve passes through, so that the inner cavity of the cylinder head and The hole connected to the inner cavity of the body, the lower end of the tappet is matched with the groove of the upper end, the upper end of the tappet...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a four-stroke gasoline engine with a camshaft air distribution mechanism in the cylinder head, the air distribution mechanism has small weight, low running inertia, low noise and good economy, so as to solve the problem of the heavy weight of the existing four-stroke gasoline engine air distribution mechanism , High running inertia, high noise and high fuel consumption

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