What is a car valve spring
automobile valve spring is an important part of automobile engine, located between the cylinder head and the valve rod tail spring seat. Its main function is to ensure that the valve is seated in time and tightly fitted to prevent the valve from beating during engine vibration, thus destroying its sealing .
Valve springs are usually made of high quality alloy steel wire and are heat treated to increase their fatigue strength. In order to prevent corrosion of the spring, the surface will be galvanized or phosphating. Its two ends should be ground flat and perpendicular to the spring axis to prevent skew during the working process.
The design and material selection of the valve spring have an important effect on the performance of the engine. In order to avoid resonance, modern engines mostly use variable pitch springs or concentrically mounted double springs. The double spring design includes two oppositely rotated springs inside and outside. The outer spring stiffness is large, which can effectively prevent resonance, and when one spring is broken, the other can continue to work to ensure the normal closure of the valve .
The working principle of the valve spring is to ensure that the valve is closely fitted to the valve seat by overcoming the inertial force during the valve closing process and prevent the valve from jumping under the pressure load. In addition, the valve spring can also control the movement of the valve to avoid the separation of the valve mechanism .
In short, although the valve spring is small in the engine, its role is crucial to ensure the normal operation and stable performance of the engine.
The main role of automobile valve spring includes the following aspects :
Ensure timely valve seat and tight fit : the valve spring can ensure that the valve can be tightly fitted with the valve seat or valve seat ring when closed, prevent the valve from jumping when the engine vibration, so as to maintain a good seal .
overcome inertial force : when the valve is opened, the valve mechanism will produce inertial force, the valve spring can overcome these inertial forces to ensure that the transmission parts are always controlled by the CAM and not separated from each other .
to prevent resonance and flutter : in order to prevent the valve spring resonance in the working process, some engines use double valve spring structure, the two spring rotation opposite, which can offset the vibration of the spring each other, improve the stability of the valve spring .
Improved fatigue strength and reliability : Valve springs are usually made of high quality alloy steel wire and heat-treated to improve their fatigue resistance. To prevent rust, the surface is galvanized or phosphating .
Adapt to high dynamic stress and high-speed operation : with the engine to high-power, high-speed development, valve springs need to withstand higher dynamic stress and faster response speed. Therefore, the design and manufacture of valve springs require higher technical requirements .
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