Pressure-limit air-leakage auxiliary braking valve device with air vent of piston tappet sleeve

Abstract

The invention relates to a pressure-limit air-leakage auxiliary braking valve device with an air vent of a piston tappet sleeve. The pressure-limit air-leakage auxiliary braking valve device comprises a valve body, a butterfly sheet, a supporting device, a pressure adjusting device and a decompression opening device, wherein the pressure adjusting device comprises the piston tappet sleeve; the piston tappet sleeve comprises a piston tappet part and a piston sleeve part, which are integrally manufactured; the piston tappet part is a cylinder; one end of the piston tappet part convexly extends into a supporting groove through the supporting device, and moves by receiving different air pressures transmitted by the decompression opening device; one end of the piston tappet part, which is inserted into the supporting groove, is an end face; and furthermore, a pressure stabilizing ventilation hole is formed in a valve body at one side of an air inlet cavity, and is communicated with the air inlet cavity and the pressure adjusting device. The pressure-limit air-leakage auxiliary braking valve device provided by the invention has the advantages that the structure is compact; the motion process of the piston tappet sleeve is effectively controlled; the exhaust back pressure value with the low speed in an engine is increased; the resistance is small when the piston tappet sleeve does the reciprocating motion; and an inner spring is prevented from losing efficiency due to a high temperature, so that the service life of the pressure-limit air-leakage auxiliary braking valve device can 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 vehicle with air holes in a piston tappet sleeve. 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. 20071013...

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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