Pressure-limiting and air-releasing auxiliary brake valve device with arc-shaped pressure relief port

Abstract

The invention discloses a pressure limiting and air leaking auxiliary brake valve device with a circular-arc-shaped pressure leaking port. The pressure limiting and air leaking auxiliary brake valve device with the circular-arc-shaped pressure leaking port comprises a valve body, a butterfly sheet, a support device and a pressure regulating device; a support groove of the butterfly sheet is a circular ladder-shaped groove, a first ladder, a second ladder and a third ladder are respectively arranged from the outer edge of the butterfly sheet, and the inner diameters are sequentially decreased; the pressure leaking port device comprises a first pressure leaking port and a second pressure leaking port, wherein the first pressure leaking port is positioned on the groove wall of a third ladder of the support groove at one side of an air intake cavity of the butterfly sheet; the second pressure leaking port is positioned on the groove wall of a first ladder of the support groove at one side of an air exhaust cavity of the butterfly sheet; a channel positioned between the first pressure leaking port and the second pressure leaking port is in a zigzag shape; the first pressure leaking port and the second pressure leaking port are strip-shaped; and circular-arc-shaped through holes are formed at two ends of the first pressure leaking port and the second pressure leaking port. The pressure limiting and air leaking auxiliary brake valve device provided by the invention is compact in structure, and effectively controls the motion stroke of a piston tappet rod, improves the air exhaust back pressure value of an engine at the middle and low speeds, guarantees the small resistance of the tappet rod in reciprocating operation, prevents an inner spring from being invalid because of high temperature, thus the service life of an auxiliary brake valve device is long.

Description

technical field [0001] The invention relates to an auxiliary brake device, in particular to a pressure-limiting and air-releasing auxiliary brake valve device of a circular arc-shaped pressure relief port of 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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