Auxiliary brake valve device with pressure limiting and venting with piston tappet

Abstract

The invention relates to a pressure-limiting venting auxiliary brake valve device with a piston tappet. The pressure-limiting venting auxiliary brake valve device comprises a valve body, a disk, a support device, a pressure adjusting device, and a pressure relief opening device. A fixed through hole is reserved on the valve body. A drive shaft penetrates the fixed through hole to fix the disk in the inner cavity of the valve body. The disk is provided with a fixed notch and a support groove. The pressure adjusting device comprises the cylindrical piston tappet. One end of the piston tappet passes through the support device and protrudes into the support groove. The piston tappet is disposed between the support device and the support groove and bears different pressures transmitted from the pressure relief opening device to move. The end, inserted into the support groove, of the piston tappet is a planar cone. The pressure limiting venting auxiliary brake valve device is compact in structure, can effectively control motion travel of the piston tappet and improve exhaust back pressure of an engine at low speed, guarantees low resistance of reciprocating motion of the piston tappet, prevents failure of an inner spring due to high temperature, and enables service life of the auxiliary brake valve device to be prolonged.

Description

technical field [0001] The invention relates to an auxiliary braking device, in particular to a pressure-limiting and air-releasing auxiliary braking valve device with a piston tappet for a vehicle. 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 effective movement. [0004] Chinese Patent Nos. 200710137250.X and 2008101260...

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

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