A leak-proof engine cylinder head water outlet cover and its manufacturing process

Abstract

The invention provides a leakage-proof type engine cylinder head water outlet cover. The water outlet cover comprises a hollow plastic cavity, two or more heat dissipation connecting pipes communicated with an inner cavity body of the cavity are arranged on the cavity, inserts are fixed to the inner walls of pipe openings of the heat dissipation connecting pipes respectively, one end of each insert is inlaid in the pipe wall of the corresponding heat dissipation connecting pipe, the other end of the corresponding insert protrudes out of the pipe opening of the corresponding heat dissipation connecting pipe, the length of the connection part between each insert and the corresponding heat dissipation connecting pipe is smaller than the length of the corresponding heat dissipation connecting pipe, a pressure relief bolt is arranged on the cavity wall of the cavity, a threaded rod of the pressure relief bolt is of a hollow structure, a pressure relief hole is formed inside the threaded rod, and two openings of the pressure relief hole are located at the bottom face and the side face of the threaded rod respectively; the cavity is formed through injection molding, and inserts are pre-buried before the injection molding. Special technology is adopted in the cylinder head water outlet cover, so that the inserts are closely attached to a plastic body of the cylinder head water outlet cover, the seal and leak-proof effects are good, by means of the cylinder head water outlet cover, the inserts can be prevented from being in direct contact with cooling liquid, and the cylinder head water outlet cover has the pressure relief function.

Description

technical field [0001] The invention relates to a water outlet cover of an engine cylinder head and a manufacturing process thereof, belonging to the technical field of engine cooling devices. Background technique [0002] As the production of automobiles increases year by year, fuel prices rise. Therefore, the important task of the design, manufacture and use of auto parts at this stage is to save fuel, improve fuel economy, and reduce the weight of the vehicle body and interior parts. Quantification is the most effective and important measure to reduce fuel consumption. To carry out research on vehicle engine lightweight, it is necessary to ensure vehicle strength and safety performance through structural design, design optimization, installation verification, physical and chemical tests, and complete machine tests. Step by step to demonstrate its compatibility. With the rapid development of science and technology, engineering plastics with high friction resistance and hi...

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Problems solved by technology

[0003] The cylinder head water outlet cover is the cooling part of the engine. The engine cooling pipe and the peripheral radiator are connected through the cylinder head water outlet cover, and the coolant flows in the cylinder head water outlet cover; the existing cylinder head outlet made of engineering plastics For the water outlet cover, an internal thread is directly provided at the nozzle of the heat dissipation connection pipe. Since the connection is made of plastic, the connection strength is poor; some plastic cylinder head water outlet covers are equipped with copper inserts on the inner wall of the heat dissipation connection pipe to improve the connection. Strength, the end faces at both ends of the copper insert are flush with the nozzles at both ends of the heat dissipation connecting pipe, because the cylinder head water outlet cover has been in the high temperature environment of the engine working stroke for a long time, and the thermal expansion coefficient of brass is relatively different from that of plastic. Repeated cooling and heating cycles will easily cause gaps between the plastic body and the insert, resulting in leakage of coolant. When installing the insert for this type of cylinder head water outlet cover, the method of inserting the core into the cavity mold blank is adopted. The mold base of the cavity has been squeezed and deformed during the installation process, making it difficult to fully fit the insert and the plastic body, resulting in leakage of coolant

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