Electric EGR valve

Abstract

The invention discloses an electric EGR valve which comprises a shell, a driving motor, a valve rod and a valve block. The driving motor is arranged in the shell, and connected with an intermediate gear, the intermediate gear is meshed with a sector gear, the sector gear is integrally connected with a torsional spring seat, the torsional spring seat is connected with a return torsional spring, the other end of the return torsional spring is fixed to the shell, the sector gear is fixed to a driving shaft, the driving shaft is rotatably arranged in the shell through a rolling bearing and a sliding bearing, an induction magnet is arranged on the driving shaft, and electrically connected with a Hall sensor, a cam groove is formed in the sector gear, a cam bearing is arranged in the cam groove, the cam bearing is connected with a cam bearing shaft and a cam bearing support, the upper end of the valve rod is connected with the cam bearing support, and the lower end of the valve rod is connected with the valve block. The EGR valve is accurate in control, convenient to assemble and low in failure rate.

Description

Technical field [0001] The invention relates to the field of automobile generators, in particular to an electric EGR valve. Background technique [0002] The electric EGR valve is a mechatronic product installed on the engine to control the amount of exhaust gas recirculation feedback to the intake system. It is the most critical and core component of the exhaust gas recirculation device. Whether its work is stable and reliable. Affect engine emissions and normal operation. This structure can accurately control the valve lift position, and then accurately control the EGR rate. In addition, the basic principle of the exhaust gas recirculation system on the automobile is to reintroduce part of the exhaust gas discharged from the engine into the intake system to improve the combustion performance, so as to reduce the formation of NOx and waste emissions from the engine to the atmosphere, and reduce the pollution. Atmospheric pollution and the formation of smog. [0003] For the tra...

AI Technical Summary

Problems solved by technology

[0004] 1) Adopt contact position sensor: Since this type of sensor must rely on contact contact to complete the signal transmission, after long-term operation, due to mechanical wear and other factors, the signal transmission will be distorted or hysteresis, and the opening of the valve body cannot be controlled. Provides precise control to affect engine emissions

[0005] 2) The return spring in the valve return control mechanism is difficult to assemble, and the assembly is prone to errors, and the rapid return function cannot be realized

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