Valve bridge and rocker arm assembly and engine comprising same

Abstract

The invention discloses a valve bridge and rocker arm assembly. The valve bridge and rocker arm assembly comprises a valve bridge body and a rocker arm; the valve bridge body is provided with piston cavities, an executing pin installation cavity, pistons arranged inside the piston cavities and an executing pin arranged inside the executing pin installation cavity; an elastic part is arranged between the executing pin and the executing pin installation cavity, and the upper end of the executing pin extends out of the executing pin installation cavity under the effect of the elastic force of the elastic part; the valve bridge body is provided with a first oil drainage channel communicating with the piston cavities, and a second oil drainage channel with one end communicating with an oil return cavity of an engine is formed inside the executing pin; and the rocker arm is provided with a protrusion structure corresponding to the executing pin. According to the valve bridge and rocker arm assembly, the technical problem of collision and abrasion between a sealing device and the valve bridge and the technical problem of inconvenient arrangement of the sealing device can be solved.

Description

technical field [0001] The invention relates to the technical field of engine accessories, more specifically, to a valve bridge and rocker arm assembly and an engine including the valve bridge and rocker arm assembly. 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 ...

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.

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