Combined type engine

Abstract

The invention discloses a combined type engine. The combined type engine comprises an air cylinder body assembly, a crank case, a main bearing cover and a main bearing cover bolt. The air cylinder body assembly integrates an air cylinder cover and an air cylinder sleeve. One end of the main bearing cover bolt penetrates through the main bearing cover and the crank case and is tightened to the lower part of the air cylinder body assembly. A processing notch structure or an expansion end structure is adopted between the main bearing cover and the crank case. The combined type engine can meet thedesign requirements of engines with different displacement, and the development serialization and part universalization of the engine are realized.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a combined engine. Background technique [0002] The traditional internal combustion engine structure is composed of cylinder head 2, cylinder head gasket 3, cylinder liner, cylinder block 4, crankcase, main bearing cap 6 and main bearing cap bolts 5, etc. The cylinder liner is divided into a dry type cylinder liner and a wet type cylinder liner, which are usually fitted into the cylinder block 4 with clearance fit or transition fit. Cylinder block 4 and cylinder head 2 are fastened with cylinder head bolts 1 and sealed with cylinder head gasket 3, see figure 1 shown. [0003] In the prior art solution, the cooperation between the cylinder liner and the cylinder block requires a special design, and a special press-fitting process is required, the cost of the parts is high, and the assembly is difficult. When the cylinder liner is not assembled correctly, it...

AI Technical Summary

Problems solved by technology

[0003] In the existing technical solutions, the cooperation between the cylinder liner and the cylinder block needs a special design, and a special press-fitting process is required, the cost of the parts is high, and the assembly is difficult

When the cylinder liner is not assembled correctly, it is easy to cause the cylinder liner to be deformed, which will cause the cylinder to be pulled and the engine to be scrapped

[0004] In the existing technical scheme, there is a flow of lubricating oil and coolant between the cylinder block and the cylinder head, which is sealed by the cylinder head gasket. The cylinder head gasket is easily damaged under the action of alternating thermal and mechanical stress, causing air leakage , water leakage, oil leakage and other faults

Cylinder head bolts are prone to fatigue under mechanical stress, which will also lead to failure of cylinder head gasket seal failure

[0005] In the existing technical solution, engines with different displacements need to design different important parts such as cylinder heads, cylinder blocks, cylinder liners, cylinder head gaskets, etc. The commonality of parts between engines with different displacements is poor, the cost is high, and it is not conducive to serialization to develop

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