Piston type four stroke internal combustion engine with two crankshafts

Abstract

Disclosed is a piston type four stroke internal combustion engine with two crankshafts. The piston type four stroke internal combustion engine with the two crankshafts comprises an air cylinder body, an air cylinder, a piston, a piston pin, a connection rod and a crankshaft case, and further comprises a double crankshaft structure, wherein the double crankshaft structure comprises a main crankshaft, an auxiliary crankshaft, a center gear, a center half shaft and a power output shaft. When the piston type four stroke internal combustion engine with the two crankshafts is assembled and under the state that compression stroke ends and ignition power stroke begins, the piston is at a top dead center position, the circle center of the piston pin, the circle center of a crank pin on the auxiliary crankshaft and the circle center of an offset hole of the main crankshaft are located on the same straight line, an angle of 90 degrees is formed by a connection line from the piston pin to the offset hole of the main crankshaft and a connection line from the offset hole of the main crankshaft to the center of the main crankshaft, thrust generated by gas expansion at the acting moment drives the main crankshaft to rotate sequentially through the piston and the auxiliary crankshaft, and then the main crankshaft drives the power output shaft to rotate so as to output power, and a large proportion of thrust generated by gas expansion at the power output moment accomplishes useful work, and an internal combustion engine is low in power loss and high in work efficiency.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, in particular to a piston-type four-stroke internal combustion engine with two crankshafts. Background technique [0002] The invention relates to a piston type four-stroke internal combustion engine with two crankshafts. The power transmission system of the piston type single crankshaft four-stroke internal combustion engine in the prior art consists of a crankshaft, a connecting rod, a piston pin, a piston and a cylinder The piston type single crankshaft four-stroke internal combustion engine in the prior art has four strokes in one power cycle. When the compression stroke ends and the power stroke begins, the piston is at the top dead center. At this time, the center of the piston pin reaches the crankshaft The line connecting the center of the crankpin and the center of the crankpin of the crankshaft to the center of the main shaft of the crankshaft forms an angle of 180 degrees. At th...

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Problems solved by technology

[0003] In order to solve the above-mentioned problems, the present invention provides a piston-type four-stroke internal combustion engine with two crankshafts, which overcomes the problem of the single crankshaft internal combustion engine in the prior art when the compression stroke ends and the power stroke begins, and the piston is at the top dead center. The thrust generated by the expansion passes through the center of the crankshaft main shaft, causing the thrust at this moment to be unable to push the crankshaft to rotate, resulting in large power loss and low working efficiency of the internal combustion engine. The present invention adopts the following technical solutions:

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