Variable valve timing structure of motorcycle engine

Abstract

The invention provides a variable valve timing structure of a motorcycle engine, belongs to the technical field of motorcycle engines, and solves the problem that when the rotating speed of an existing motorcycle engine changes, the torque performance and economic performance of the engine are reduced. The variable valve timing structure of the motorcycle engine comprises a cylinder body and a camshaft, an exhaust cam is fixedly connected onto the camshaft, the variable valve timing structure comprises an admission cam, a driving disc and a driven disc, the admission cam sleeves the camshaft in a rotating manner, the driving disc fixedly sleeves the camshaft, the driven disc sleeves the camshaft in a rotating manner, a first transmission structure and a second transmission structure are arranged between the driving disc and the driven disc. The variable valve timing structure of the motorcycle engine can change valve timing through the rotating speed of the camshaft, so as to guarantee the air inflow of an air cylinder, and improve the combustion efficiency of the engine.

Description

technical field [0001] The invention belongs to the technical field of motorcycle engines, and relates to a variable valve timing structure of a motorcycle engine. Background technique [0002] The principle of engine variable valve timing technology is to adjust the intake (exhaust) amount, valve opening and closing time, and angle according to the operating conditions of the engine, so that the amount of air entering can reach the optimum value and improve combustion efficiency. The advantage is that it saves fuel and has a large power-to-liter ratio. The working speed range of a motorcycle is 1500-12000 rpm, and the working range is 2-3 times that of a car. If a fixed valve timing structure is used, it is difficult to achieve the best output torque characteristics and fuel economy characteristics of the engine at different speeds. The conventional method is to configure a specific motorcycle for common operating conditions. Valve timing phase, but when the motorcycle is...

AI Technical Summary

Problems solved by technology

If a fixed valve timing structure is used, it is difficult to achieve the best output torque characteristics and fuel economy characteristics of the engine at different speeds. The conventional method is to configure a specific motorcycle for common operating conditions. Valve timing phase, but when the motorcycle is used in other conditions, the torque performance and economic performance of the engine will be greatly reduced

At present, cars in the society are generally equipped with variable valve timing structures. However, due to the compact structure of motorcycle engines, small design space, and low manufacturing costs, it is difficult to graft the variable valve timing structures of automobiles to motorcycles.

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