Pressure limiting and air leaking auxiliary brake valve device of zigzag channel

Abstract

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

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 of a zigzag channel 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. 200710137250.X and 200810...

AI Technical Summary

Problems solved by technology

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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