Valve element assembling structure for double-valve element EGR valve

Abstract

The invention discloses a valve element assembling structure for a double-valve element EGR valve. The valve element assembling structure comprises a central rod which is inserted into a valve assembly; a small valve element and a big valve element which are matched with a valve seat sealing port are respectively fixed on a middle lower part of the central rod; the central rod is fixedly connectedwith the small valve element and the big valve element in the manner of welding; the small valve element and the big valve element are in same structure and both have a conical valve element structure; the diameter of the top end face of the conical valve element is smaller than the diameter of a valve body sealing port; the diameter of the bottom end face of the conical valve element is greaterthan the diameter of the valve body sealing port; a driving plate with a cam structure is arranged in the valve seat above the central rod; one end of the driving plate is connected with a motor shaftof the EGR valve through a rotating shaft; the other end of the driving plate is resisted against and connected with the central rod. According to the invention, a welding assembling technology is adopted for assembling the small valve element, the big valve element and the central rod, so that the difficulty of the original double-valve element EGR valve assembling technology is reduced, the production cost of the double-valve element EGR valve is lowered and the production quality of the double-valve element EGR valve is increased.

Description

technical field [0001] The invention relates to the technical field of exhaust gas recirculation systems of engines, in particular to an assembly structure of double-spool EGR. Background technique [0002] The electric EGR valve is a mechatronic product installed on the engine to control the amount of exhaust gas recirculation fed back to the intake system. It is the most important and key component of the exhaust gas recirculation device. As the national emission regulations become more and more stringent, double-spool EGR valves are widely used in the market due to their good sealing performance, less leakage and long service life. [0003] In the past, the assembly structure of the double-spool EGR valve used the process of press-fitting the small spool with the center rod, pressing riveting and then installing it into the valve body assembly, and then welding the large spool. This required three processes, and the assembly was complicated. In the current fierce competi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide an assembly structure of a double valve core and a central rod, which solves the problems of complicated assembly process, high cost and low work efficiency in the current assembly, thereby improving the quality of the electric EGR valve

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