Insert, engine cylinder head and engine

Abstract

The invention discloses an insert, an engine cylinder head and an engine. The insert comprises a steel or casting iron insert I used for pouring the engine cylinder head. The steel or casting iron insert I forms a supporting portion installed by a rocker arm bracket to support an engine gas distribution system. The invention is used for the engine, when the engine temperature increases, the expansion amount of the parts of a gas distribution mechanism is equal, no change or little change of valve clearance between a cold and hot machine is guaranteed all the time, so that the problem that theengine became louder caused by the valve clearance between a cold and hot machine can be solved; meanwhile, the whole cylinder head of the engine and an upper rocker arm part can be fixedly installed,the temperature rise while the engine working, while the working operation and relative location of an upper rocker arm has no change or little change, weak installation of the upper rocker arm due to temperature difference of the cold and hot machine and result in a louder gas distribution mechanism are prevented , meanwhile integral strength of the cylinder head is guaranteed, the usage of aluminum alloy material is reduced, cost is saved and low noise, and economical and efficient operation of the engine is guaranteed.

Description

technical field [0001] The invention relates to power equipment, in particular to an insert, an engine cylinder head and an engine. Background technique [0002] The engine is a commonly used power device. Since the engine is a typical heat engine and generates power through the combustion of fuel, the engine block, cylinder head, crankshaft and various components of the gas distribution system will undergo thermal deformation. In the existing engines, the cylinder head is generally made of aluminum alloy, which is light in weight and has sufficient strength. [0003] However, the cooperation between the aluminum alloy cylinder head and other parts of the engine will have a series of problems, such as the gas distribution system. The thermal expansion coefficients of the materials are quite different. When the heat engine is working, the thermal deformation of the aluminum alloy cylinder head is different from the thermal expansion coefficient of the rocker arm assembly, wh...

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Problems solved by technology

[0003] However, the cooperation between the aluminum alloy cylinder head and other parts of the engine will have a series of problems, such as the gas distribution system. The thermal expansion coefficients of the materials are quite different. When the heat engine is working, the thermal deformation of the aluminum alloy cylinder head is different from the thermal expansion coefficient of the rocker arm assembly, which will cause the valve clearance to become larger, thereby affecting the normal operation of the engine and increasing engine noise. and can lead to lower engine efficiency, which is not conducive to the economical and efficient operation of the engine

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