Crankshaft assembly and engine

Abstract

The invention discloses a crankshaft assembly, which includes a crankshaft and a filler, and the filler is connected to the crankshaft through an interference connection, so that the filler and the crankshaft are connected as a whole; the filler is fixed to the crankshaft through an interference connection In addition, it not only has a simple and compact structure, but also reduces the number of parts assembled, thereby improving assembly efficiency, reducing the weight of the crankshaft assembly, thereby reducing the rotational inertia force of the crankshaft, and saving production costs; The above-mentioned crankshaft assembly is installed on the engine, thereby reducing the overall mass of the engine, realizing a lightweight design, and improving the scavenging efficiency of the engine cylinder block, thereby improving the performance of the engine, reducing production costs, and improving market competitiveness .

Description

technical field [0001] The invention relates to the field of engines, in particular to a crankshaft assembly and an engine. Background technique [0002] The scavenging of the two-stroke engine mainly relies on the compression of the volume of the crankcase when the piston descends to generate a pressure difference (the pressure in the crankcase is greater than the pressure in the cylinder body). After the scavenging port is opened, the gas in the crankcase enters the cylinder through the scavenging port. , to sweep the burned exhaust gas out of the cylinder, and the gas supply ratio and gas supply efficiency of the crankcase scavenging gas are mainly determined by the shape and size of the intake port, scavenging port, exhaust port, and the volume of the crankcase; but the crankshaft The volume of the box is strictly limited by the structure of the crankcase. In the prior art, the crankshaft filler is usually used to reduce the gas volume in the crankcase. At present, all c...

AI Technical Summary

Problems solved by technology

[0002] The scavenging of the two-stroke engine mainly relies on the compression of the volume of the crankcase when the piston descends to generate a pressure difference (the pressure in the crankcase is greater than the pressure in the cylinder body). After the scavenging port is opened, the gas in the crankcase enters the cylinder through the scavenging port. , to sweep the combusted exhaust gas out of the cylinder, and the air supply ratio and air supply efficiency of the crankcase scavenging air are mainly determined by the shape and size of the intake port, scavenging port, exhaust port, and the volume of the crankcase; but the crankshaft The volume of the box is strictly limited by the structure of the crankcase. In the prior art, crankshaft packing is usually used to reduce the gas volume in the crankcase. At present, all crankshaft packings rely on bolts or various additional connecting components to install and fix the crankshaft packing on the crankcase. On the arm, its structure is complex, the number of parts is large, and the mass is large, which is not only inconvenient to assemble, but also increases the overall quality and production cost of the engine.

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