Auxiliary brake valve device with pressure limiting and air release with arc-shaped piston sleeve

Abstract

The invention relates to a pressure-limiting exhaust auxiliary brake valve set with an arced piston bush. The brake valve set comprises a valve, a disc, a support device, a pressure regulator and a pressure relief opening device. The valve is provided with a fixed through hole. A drive shaft penetrates through the fixed through hole of the valve to fix the disc in an inner cavity of the valve. The pressure regulator comprises a shell of the pressure regulator, a piston tappet, an inner spring, a screw plug and the piston bush. The round-cup-shaped piston bush is disposed in the shell of the pressure regulator, one side of the outside of the cupped bottom of the piston bush is in contact connection with the piston tappet, one side of the inside of the cupped bottom of the piston bush is in contact connection with the inner spring, and the outer wall of the cup is arced. The pressure-limiting exhaust auxiliary brake valve set with the arced piston bush is compact in structure, and moving stroke of the piston tappet is controlled effectively; a value of exhaust back pressure in an engine at low speed is increased; and small resistance in reciprocating motion of the piston tappet is guaranteed, the inner spring can be prevented from failure due to high temperature, and accordingly the service life of the auxiliary brake valve set is longer.

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 circular-arc-shaped piston sleeve 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. 200710137...

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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