Vehicle engine symmetric air inlet cam

Abstract

The application discloses a vehicle engine symmetric air inlet cam. The cam profile of the vehicle engine symmetric inlet cam comprises a base circle and a cam nose, wherein the wrap angle of an operation section on a valve opening side on the cam nose is equal to the wrap angle of an operation section on a valve closing side, and the fullness coefficients of both the cam profile of the valve opening side and the cam profile of the valve closing side are larger than or equal to 0.57; the two end points where the base circle and the cam nose are intersected with one diameter line of the base circle are respectively a valve opening end point a and a valve closing end point b, and the circle center of the base circle and the radial center of the cam nose are overlapped with the central point of the cam. In the vehicle engine symmetric air inlet cam provided by the invention, a valve can be opened after the cam rotates by half of the base circle, and the valve air inlet time is prolonged, so that the inflating efficiency is improved, the fuel oil is fully burnt, the oil consumption is reduced, the power per liter of an engine is improved, and the engine performance is improved.

Description

technical field [0001] The invention relates to the technical field of engine cams, in particular to a symmetrical intake cam for a vehicle engine. Background technique [0002] The valve train is the core part of the engine, and the profile design of the valve cam is one of the important ways to optimize the design of the valve train. Whether the design is reasonable or not is directly related to the power, economy and reliability of the internal combustion engine. A good cam profile design can make full use of the intake inertia to improve the charging efficiency, thereby improving the performance of the engine. Poor cam profile design will lead to low engine charging efficiency, low power torque, poor lubrication between cam and tappet, resulting in abnormal wear of parts, and in severe cases, it will also cause valve seat bounce and valve train to fly off. [0003] The cam profile design used on the existing small car engine has not been rationally optimized, the engine...

AI Technical Summary

Problems solved by technology

Poor cam profile design will lead to low engine charging efficiency, low power torque, poor lubrication between the cam and the tappet, resulting in abnormal wear of the parts, and in severe cases, it will also cause the valve seat bounce and the valve mechanism to fly off

[0003] The cam profile design used on the existing small car engine has not been rationally optimized, the engine power per liter is low, the fuel consumption is high, and the performance is not good

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