Composite internal combustion engine cylinder head

Abstract

The invention relates to a composite cylinder head of an internal combustion engine, which comprises a cylinder head body, an exhaust manifold is arranged at the lower part of the cylinder head body, and a cooling water jacket is distributed along the outer periphery of the exhaust manifold. The surface of the outer wall is the upper and lower independent parts divided by the parting surface. The upper independent part is the upper body of the cylinder head supporting the camshaft system, which is integrally formed of plastic material, and the lower independent part is the contact cylinder body. The flame and the lower body of the cylinder head subjected to high-temperature air flow are made of metal materials, and a positioning structure is provided at the junction of the lower body of the cylinder head and the upper body of the cylinder head. The original metal integral cylinder head is split into a metal lower body and a plastic upper body, and the engine cooling design is used to expand the application of plastics. At the same time, a special sealing and fastening structure is designed to avoid the expansion of different materials in different The problems of cracks, water leakage and oil leakage under the same characteristics; the weight of the machine body is reduced, the processing technology and steps are reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a composite cylinder head of an internal combustion engine. Background technique [0002] Because engine can produce high temperature when working, it can be cooled with cooling water simultaneously, so existing piston type internal combustion engine cylinder head all adopts metal material to make generally, mainly cast iron or cast aluminum. However, cast iron is generally heavy in weight and low in cost, but its processing cost is high, and it is mostly used in diesel engines. Aluminum cylinder heads are widely used in gasoline engines. During the production and production of metal materials, the pollution and energy consumption of foundry factories are very large. In the later processing process, the metal cutting process is complicated and the sewage discharge is also large. Therefore, in recent years, it has been difficult for engine cylinder head castin...

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Problems solved by technology

However, cast iron generally has a large weight and low cost, but the processing cost is high, and it is mostly used in diesel engines

Aluminum cylinder heads are widely used in gasoline engines. During the production and production of metal materials, the pollution and energy consumption of foundry factories are very large. In the later processing process, the metal cutting process is complicated and the sewage discharge is also large.

Therefore, in recent years, it has been difficult for engine cylinder head casting and machining production plants to start construction in areas with strict environmental assessments.

[0003] With the introduction of the concept of lightweight automobiles, many parts have been replaced by plastic products, but they have not been applied to the cylinder head of the internal combustion engine. If the cylinder head of the internal combustion engine is made into an all-plastic part, the existing materials cannot achieve long-term durability of the internal combustion engine. High temperature during work; if the cylinder head of an internal combustion engine is designed to be partially plastic and partially metal, there are three problems:

[0004] a. The combination and sealing of the plastic cylinder head part and the metal cylinder head part: Since the expansion of plastic materials is higher than that of metal, after being heated, the expansion tendency is greater than that of metal; and because there is cooling water between the cylinder block and cylinder head of the internal combustion engine flow, so the expansion may cause leakage, causing engine failure;

[0005] b. The problem of maintaining the strength of the plastic cylinder head during work: All modified plastics will lose their strength as the temperature rises. How to ensure that the temperature of the plastic cylinder head is stable within the required range can avoid high temperature damage The influence of the strength of the plastic cylinder head part;

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