Variable air inflow structure of engine

Abstract

The invention discloses a variable air inflow structure of an engine. The variable air inflow structure is mainly characterized in that an air inflow manifold is arranged between an air cleaner and a variable air inflow structural member of a motorcycle; the air inflow manifold comprises a high-speed manifold and a low-speed manifold; the front end of the high-speed manifold is provided with the variable air inflow structural member, and the other end of the high-speed manifold is connected with the air cleaner through a first inlet, wherein the high-speed manifold is provided with a rotary valve; the low-speed manifold is arranged between the rotary valve of the high-speed manifold and the variable air inflow structural member in an extending manner; the other end of the low-speed manifold is connected with the air cleaner through a second inlet, and forms an air duct with an annular wall by means of a baffle plate in the air cleaner; and the flow duct of the low-speed manifold can be prolonged in a limited space, so that the performance of high and low speed of the engine is considered simultaneously, and the efficacy of miniaturization of the low-speed manifold can be achieved.

Description

【Technical field】 [0001] The invention relates to a variable air intake structure of an engine, in particular to a cylinder head structure of a water-cooled engine that can improve the heat dissipation of the cylinder head and enhance the anti-knock strength of the cylinder head. 【Background technique】 [0002] In the engine design of a general scooter motorcycle, the design of the intake pipeline and the mutual cooperation between the engine are extremely important. For example, when the engine is at a slow or low speed, the required cross-sectional area of ​​the intake pipeline is relatively small Small size and long length can help to increase the gas flow velocity in the intake pipe, and thus enhance the inertial effect and pulsation effect, thereby improving the intake efficiency and increasing the engine torque; on the contrary, when the engine is running at a fast or high speed, its The required cross-sectional area of ​​the intake pipe is relatively large and the len...

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Problems solved by technology

[0003] However, for the design of the air intake pipeline of the general scooter motorcycle engine at present, please refer to figure 1 , 2 As shown, it is mainly to arrange an intake manifold 3 between the air filter 1 of the motorcycle and the intake variable member 2 (which can be a carburetor or a throttle body), and the intake manifold 3 The front end is provided with a throttle valve body 4, because the cross-sectional area and length of the intake manifold 3 are all fixed, when the engine runs to generate negative pressure suction, the intake manifold 3 can only meet the requirements of lower speed or higher speed. One of the air intake requirements at high speeds cannot meet the air intake efficiency requirements of the global speed, which will result in the lack of simultaneous performance of lower speeds and higher speeds

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