Auxiliary brake valve device with pressure limiting and leaking air with end face seal ring

Abstract

The invention relates to a pressure-limiting air relief auxiliary brake valve device with an end face seal ring. The pressure-limiting air relief auxiliary brake valve device comprises a valve body, a butterfly piece, a supporting device, a pressure regulating device and a pressure relief port device, wherein the valve body is provided with a fixing through hole, a driving shaft penetrates the fixing through hole of the valve body to fix the butterfly piece in the valve body, a fixing gap and a supporting groove are respectively formed in the butterfly piece, the pressure regulating device comprises a piston tappet rod, the piston tappet rod comprises a column body and the end face seal ring, the column body is inserted into the supporting device, the end face seal ring is located between the supporting device and the supporting groove and driven to move by different air pressures transferred by the pressure relief port device. The pressure-limiting air relief auxiliary brake valve device further comprises a seal spring for adjusting the position of the end face seal ring portion. The pressure-limiting air relief auxiliary brake valve device is compact in structure, effectively controls a movement stroke of the piston tappet rod, improves an exhaust back pressure value of a large engine at medium-low speed, ensures small resistance when the piston tappet rod performs reciprocating motion and prevents the inside spring from being invalid due to high temperature, and the service life of the auxiliary brake valve device is prolonged.

Description

technical field [0001] The invention relates to an auxiliary brake device, in particular to a pressure-limiting and air-leakage auxiliary brake valve device in which the piston tappet of the auxiliary brake valve of a large engine vehicle has a sealing ring on the end face. Background technique [0002] The pressure-limiting and air-leakage auxiliary brake valve device is an auxiliary braking device for vehicles, especially suitable for commercial vehicles. Vehicle brake failure to ensure driving safety. [0003] The pressure-limiting and deflated auxiliary brake valve device in the prior art relies on the cylinder or the vacuum booster cylinder to push and pull the drive shaft to deflect to make the butterfly plate deflect. The drive shaft is inserted into the butterfly plate and fixed with rivets, and the force of the drive shaft deflection acts on the rivet , The rivet is easily deformed and broken under a large compressive force, and the butterfly cannot realize its eff...

AI Technical Summary

Problems solved by technology

[0003] The pressure-limiting and deflated auxiliary brake valve device in the prior art relies on the cylinder or the vacuum booster cylinder to push and pull the drive shaft to deflect to cause the butterfly plate to deflect. The drive shaft is inserted into the butterfly plate and fixed with rivets. , the rivet is easily deformed and broken under a large pressure, and the butterfly cannot realize its effective movement

[0004] Chinese Patent Nos. 200710137250.X and 200810126049.6 disclose a kind of exhaust brake, which includes a valve body, a disc, a support rod, a support sleeve, a pressure reducing valve, a spring and an adjusting screw. Release the excess pressure to ensure the stability of the working pressure, but when the pressure reducing valve is opened to adjust the pressure, it will cause hot gas to surround the spring, and the very high temperature will easily cause the spring to fail; moreover, the pressure reducing valve, the pressure plate and the adjusting screw have no guiding design, and the combination is not good. Stable, the offset of the pressure plate makes the adjustment screw unable to adjust the proper pressure; in addition, the pressure plate and the pressure reducing valve are easy to rotate, causing the spring torsion and causing the spring to break and fail

When the butterfly plate is closed and the engine exhaust gas is discharged into the intake chamber of the valve body, a part of the gas will inevitably enter the housing of the pressure regulating device, which hinders the reciprocating movement of the tappet and cannot effectively control the exhaust back pressure.

At the same time, due to the high temperature of the exhaust gas of the engine, the closed structure prevents the inner chamber of the pressure regulating device from dissipating heat, and the continuous high temperature will cause the pressure limiting spring to be deformed by heat, or even fail, and the braking effect of the auxiliary brake valve is seriously delayed, and the sensitivity is greatly reduced

Patent application number 201210410571.3 proposes an auxiliary brake valve device connected to the atmosphere, which solves the problem that the inner cavity of the housing cannot dissipate heat, and the continuous high temperature causes the pressure limiting spring to be deformed by heat. However, in the application of large engines, there is still a problem of poor sealing , the influence of impact force, and the problems of being unable to discharge in time, therefore, there are some urgent technical problems to be solved in the application of the pressure-limiting and air-releasing auxiliary brake valve device in the prior art

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