Air valve bridge and engine comprising air valve bridge

Abstract

The invention discloses an air valve bridge and an engine comprising the air valve bridge. The air valve bridge comprises an air valve bridge body which is provided with a main piston cavity, an executing pin installing cavity, a main piston arranged in the main piston cavity, and an executing pin arranged in the executing pin installing cavity; an elastic piece is arranged between the executing pin and the executing pin installing cavity; under the action of the elastic force of the elastic piece, the lower end of the executing pin stretches out of the executing pin installing cavity; the air valve bridge body is provided with a first oil drainage channel communicating with the main piston cavity; and a second oil drainage channel with one end communicating with an oil returning cavity of the engine is formed in the executing pin. Due to the arrangement, the air valve bridge is provided and can solve the technical problems that collision and abrasion happen to a sealing device and the air valve bridge, and the arrangement of the sealing device is difficult.

Description

technical field [0001] The invention relates to the technical field of engine accessories, more specifically, to a valve bridge and an engine including the valve bridge. Background technique [0002] When the car is going down a long slope and the driver activates the engine braking device, the oil supply system stops supplying oil, and at the same time, when the engine is close to the top dead center in the compression stroke, the exhaust valve is opened by a small lift under the drive of the engine braking device. (1 ~ 2mm), the compressed high-pressure gas in the cylinder is released quickly, and the pressure in the cylinder decreases rapidly, so in the next power stroke, the engine basically does not work externally. [0003] Among them, the valve bridge is installed on the top of the valve with the same name, which is used to transmit the force of the rocker arm to ensure that the valve with the same name is opened at the same time. When the engine is working, along wi...

AI Technical Summary

Problems solved by technology

[0007] However, the current valve bridge needs to add a separate sealing device for the oil drain hole, which is likely to cause collision wear between the sealing device and the valve bridge, and the arrangement is difficult, which affects the reliability of the engine

[0008] Therefore, how to avoid the technical problems of sealing device and valve bridge collision wear, and the difficult technical problem of sealing device arrangement has become an important technical problem to be solved by those skilled in the art.

Images