Diesel engine back pressure control valve assembly

Abstract

Provided is a back pressure control valve assembly of a diesel engine. The assembly is of a unit combination structure and comprises a driving unit A, a transmission unit B and an action unit C; and one end of a body of a cylinder of the driving unit A is hermetically, fixedly and integrally connected with a side of a transmission shell of the transmission unit B by seam allowance, the bottom of the transmission shell of the transmission unit B is hermetically, fixedly and integrally connected with the top of a valve of the action unit C by seam allowance, and the driving unit A drives the action unit C to twist via the transmission unit B so as to close or open an airflow channel of the valve. The back pressure control valve assembly has the advantages that the unit combination modular structure for specific requirements and technological parameters of WEVB (Weichai exhaust valve brake) is adopted, the standardization level is high, particularly, working media of the cylinder are not polluted or interfered by environments, accordingly, the back pressure can be accurately, stably and reliably controlled, and the back pressure control valve assembly is long in service life.

Description

technical field [0001] The invention belongs to the technical field of heavy-duty truck brake systems, and in particular relates to a diesel engine back pressure control valve assembly used in conjunction with a heavy-duty truck exhaust valve brake system (WEVB). Background technique [0002] The braking of heavy-duty trucks, in addition to the traditional braking system, has also installed a pneumatic throttle valve on the exhaust pipe as an auxiliary braking device in recent years. Not long ago, the Germans invented a new and more advanced braking technology - diesel engine exhaust valve braking system (EVB system). Because of its significant role in fuel saving, emission reduction and safety improvement, the EVB system has become an advanced The standard configuration of the country's heavy-duty trucks and enforced by regulations. In order to keep up with the world's advanced level in our country, the relevant units spent huge sums of money to purchase the EVB patent fro...

AI Technical Summary

Problems solved by technology

The work of WEVB must be based on the premise that the back pressure of the diesel engine must be controlled within the specified range through the valve on the exhaust pipe. At present, our country is using a valve device modified on the basis of the original exhaust pipe pneumatic throttle valve, which includes cylinders, pistons Rods, transmission ball joints, rocker arms, breathing holes, filter plugs, rotating shafts and valve plates, all of the above components are exposed to the atmosphere, they are large in size and weight, and under strong vibration, they are subject to great stress and are easily damaged. Poor, the application practice of WEVB has found that its reliability is extremely poor, and its life is extremely short (1 to 3 months), which hinders the popularization and application of WEVB, so it is necessary to improve the valve

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