A high temperature and high back pressure exhaust brake valve

Abstract

An exhaust brake valve with high temperature resistance and high back pressure, comprising a valve body, a valve shaft and a valve plate, the valve plate is arranged in the cavity of the valve body, and the valve plate is fixed on the valve shaft to rotate around the shaft hole of the valve body, and is characterized in that : The valve plate is eccentrically arranged in the inner cavity of the valve body; the inlet of the valve body is installed with a stepped first insert and a second insert, and the stepped parts of the first insert and the second insert are respectively Fitting with the inlet end face of the valve body and leaving a gap between the first insert, the second insert and the wall surface of the valve body; the first insert is in close contact with the part of the valve plate fixed on the valve shaft; the second insert is provided with a The inclined surface is in contact with the valve plate surface when the valve plate is closed to form a sealed cavity. The invention solves the problems that the existing exhaust brake valve has low pressure-holding capacity and structural stuck due to the thermal expansion of the sealing part; Piston section gas pressure, significantly improve engine auxiliary braking power.

Description

technical field [0001] The invention relates to an exhaust brake valve with high temperature resistance and high back pressure, belonging to the field of vehicle engine auxiliary braking. Background technique [0002] Engine exhaust braking technology refers to lifting the accelerator pedal, but not stepping on the clutch, closing the exhaust brake valve, and using the resistance, internal friction and intake and exhaust resistance generated by the movement of the engine piston to form a braking effect on the driving wheel . In recent years, in order to improve the auxiliary braking power of the engine, it is necessary to increase the exhaust back pressure, which is linked with the brake in the engine cylinder to increase the resistance of the engine piston movement, improve the auxiliary braking power of the vehicle, and improve the driving safety of the vehicle. Medium and heavy-duty diesel engines can achieve higher engine auxiliary braking power through the linkage tech...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a high temperature and high back pressure exhaust brake valve, which solves the problem of low pressure holding capacity and structural stagnation of the existing exhaust brake valve due to thermal expansion of the sealing parts by changing the sealing structure type. Problem: The exhaust brake valve is linked with the engine cylinder, which can significantly increase the pressure of the gas path from the exhaust brake valve to the engine piston, increase the running resistance of the piston when the engine brake is turned on, and significantly increase the auxiliary braking power of the engine

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