Crankshaft assembly and engine

Abstract

The invention discloses a crankshaft assembly. The crankshaft assembly comprises a crankshaft and a filler, wherein the filler is in interference connection with the crankshaft, so that the filler and the crankshaft are connected into a whole body. The filler is fixed to the crankshaft in an interference connection mode, so that the crankshaft assembly is simple and compact in structure, the number of assembled parts is reduced, the assembling efficiency is improved, the weight of the crankshaft assembly is reduced, the rotating inertia force of the crankshaft is reduced, and the production cost is saved; and the crankshaft assembly is installed on an engine, so that the overall mass of the engine is reduced, the lightweight design is realized, the scavenging efficiency of an engine cylinder body is improved, the performance of the engine is improved, the production cost is reduced, and the market competitiveness is improved.

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...

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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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