Engine, valve driving mechanism and valve bridge thereof

Abstract

The invention discloses a valve bridge for a valve driving mechanism, the valve driving mechanism includes a guide pin (22), a middle part of the valve bridge (23) is provided with a through hole (231), the guide pin (22) penetrates through the through hole (231), the through hole (231) comprises a conic hole section (2311) and a cylindrical hole section (2312), the guide pin (22) comprises a spherical section (221) of which a bus is an arc line and a cylindrical section (222) of which a bus is a straight line, a contact line between the spherical section (221) and the conic hole section (2311) is a closed loop line, and diameter of the cylindrical hole section (2312 is more than that of the cylindrical section (222). The valve bridge disclosed by the invention can provide structure base for implementing synchronous start and close of two homologous valves, and has simple structure and higher reliability. The invention also discloses a valve driving mechanism including the valve bridge and an engine including the valve driving mechanism.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a valve bridge. The present invention also relates to a valve driving mechanism comprising the above-mentioned valve bridge and an engine comprising the above-mentioned valve driving mechanism. Background technique [0002] The engine is the power source of various vehicles and various machines, and the working performance of the engine is directly related to the working performance of the vehicle and other machines. Therefore, improving the working performance of the engine has always been valued by people. [0003] The gas distribution system of the engine is a system used to ensure that the engine opens and closes the valve at the correct time to realize the supply of fresh air and the discharge of exhaust gas. A conventional four-valve engine generally includes two intake valves and two exhaust valves corresponding to the same cylinder, and the valves with the same name (tha...

AI Technical Summary

Problems solved by technology

[0007] The structure of the adjusting screw 17 and the lock nut 18 can realize the adjustment of the valve position and ensure that the two valves with the same name are opened and closed at the same time. However, due to the complex structure, the assembly process is greatly affected by human factors. If the assembly or adjustment is improper, Then the depth of the valve inserted into the positioning hole may be insufficient, resulting in the phenomenon that the valve and the valve bridge are separated from each other, causing major failures. On the other hand, the lock nut 18 is relatively easy to loosen during work, which may also cause major accidents.

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