Scooter engine with balance shaft

Abstract

The invention discloses a scooter engine with a balance shaft. The scooter engine comprises a crankcase defined by a left crankcase body and a right crankcase body. An engine oil pump, a rotary crankshaft and the rotary balance shaft are mounted in the crankcase. The crankshaft is sleeved with a balance shaft driving gear. The balance shaft is sleeved with a balance shaft driven gear. The engine oil pump is sleeved with an engine oil pump driven gear. The balance shaft driving gear is engaged with the balance shaft driven gear. The balance shaft driven gear is engaged with the engine oil pump driven gear. A first arc baffle is arranged on the inner surface of the left crankcase body. A second arc baffle corresponding to the first arc baffle is arranged on the inner surface of the right crankcase body and provided with a first oil drainage port. A third arc baffle is arranged on the outer surface of the right crankcase body and provided with a second oil drainage port. By the adoption of the structure, the volume of the crankcase does not need to be increased, and vibration and noise of the scooter engine are reduced effectively; and gear transmission is adopted in the crank shaft, the balance shaft and the engine oil pump, reliability is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a scooter engine with a balance shaft. Background technique [0002] A scooter is a vehicle between a motorcycle and a car, and it is a popular means of transportation. The balance shaft is widely used in motorcycle engines. Its structure is simple and practical, which can effectively reduce the vibration of the motorcycle and improve the driving comfort. [0003] However, for scooters, due to the limitations of their own structure, compared with the traditional chain-driven motorcycles, it has strict requirements on the size of the engine. There is also a transmission gear at the bottom of the frame and the rear end of the engine, and the oil pump also needs to be driven by the sprocket set on the crankshaft, which will inevitably take up a lot of space. It affects the driving comfort, and the sprocket is prone to deformation after long-term use, and the reliabilit...

AI Technical Summary

Problems solved by technology

[0003] However, for scooters, due to the limitations of their own structure, compared with the traditional chain-driven motorcycles, it has strict requirements on the size of the engine. There is also a transmission gear at the bottom of the frame and the rear end of the engine, and the oil pump also needs to be driven by the sprocket set on the crankshaft, which will inevitably take up a lot of space. Affects driving comfort, and the sprocket is prone to deformation after long-term use, and the reliability is low

Moreover, due to the addition of the balance shaft, the rotation of the balance shaft will inevitably cause the oil to splash

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