It is well known that there is a technical requirement for a sealed connection between the engine cylinder head cover and the cylinder head, which is to separate the internal oil and gas environment during engine operation from the outside world. Due to the integral structure of the cylinder head cover of the engine, the seal surface between the cylinder head cover and the cylinder head is relatively large and is easily deformed under the vibration conditions. The conventional seal connection method commonly used in the industry is between the cover and the cylinder head. Increase the number of rubber gaskets and tighten them with bolts and washers. This connection method must provide a suitable tightening torque for the bolts. Otherwise, the looseness of the gaskets can lead to leakage of the gaskets. The deformation and damage leakage. The engine “inventory with spring fastening bolt†invented by Xichai was a new structural design. The first use of spring elastic compression connection not only met the functional and reliability requirements, but also introduced the limiting sleeve. The bolts of complex structures are reduced to ordinary standard parts, and the limiting bayonet is added to the upper and lower ports of the limiting sleeve structure to realize that the bolts and springs constitute a freely movable assembly part, facilitating assembly. At the same time, Xichai science and technology personnel also make full use of the length of the casing to achieve the control of the spring compression force, so that the bayonet of the lower port of the casing is tightly combined with the rubber gasket, so that it is not easy to slip during the disassembly process, and a satisfactory process of bolt connection is successfully achieved. Sex and production of low-cost purposes. Xichai's first engine with spring fastening bolts not only broke through the traditional limitations of the past, but also achieved a technical upgrade of the engine seal connection with its remarkable performance and extraordinary features.
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Xichai engine 
Recently, Xichai's technological innovation has added new achievements. A group of scientific, innovative, and practical scientific and technological achievements have obtained national patents, including the engine "with spring fastening bolt assembly" proposed by the Xichai science and technology personnel. Its new structural design has achieved the technical upgrading of the engine seal connection, and at the same time Functionality, reliability, processability, and economy have also been fully improved.