Cylinder body structure of air and water cooling engine

Abstract

The invention belongs to the technical field of manufacture of engine parts, and relates to a cylinder body structure of an air and water cooling engine. The cylinder body structure is characterized in that a cylinder sleeve is composed of a cylinder sleeve inner sleeve (4-1) and a cylinder sleeve outer sleeve (4-2), wherein a cooling water cavity (6) is composed of an enclosed space formed between the cylinder sleeve inner sleeve (4-1) and the cylinder sleeve outer sleeve (4-2); a wall of the cylinder sleeve inner sleeve (4-1) is provided with at least two cylinder-shaped ear holes (5) which are vertically communicated, and a cylinder body shell (3) and the outer surface of the cooling water cavity (6), the outer wall surface of the cylinder sleeve outer sleeve and part of the outer wall surface of the cylinder sleeve inner sleeve are combined in a non-gap manner. The cylinder body structure provided by the invention has the advantages that the structure design is reasonable and simple, the manufacturability of manufacturing is improved, the manufacturing cost is reduced, the cylinder body structure has another characteristic that the cooling effect is improved, and meanwhile, the water-leaking hidden danger of the cylinder body structure of the existing air and water cooling engine is overcome.

Description

technical field [0001] The invention belongs to the technical field of engine component manufacturing, and in particular relates to a cylinder block structure of an air-cooled and water-cooled engine. Background technique [0002] As the three-wheeled motorcycles are put into use in a large number in China, most of the three-wheeled motorcycles use natural air-cooled engines. The cylinder block of the engine is composed of two parts: the cylinder liner and the cylinder shell. On the outer surface, cooling fins are arranged on the outer surface of the cylinder housing, and the cooling of the engine is realized by the air flow of the three-wheeled motorcycle during running. Since the three-wheeled motorcycles are often used under the conditions of low speed, heavy load and bad road conditions, the low speed of the three-wheeled motorcycles will take away the heat from the engine running under high load, so the natural air-cooled engine cooling system can no longer meet the nee...

AI Technical Summary

Problems solved by technology

[0007] (1) The structure of the cylinder block leads to a decrease in its heat transfer capacity, which cannot meet the cooling requirements of the tricycle engine

The cylinder liner and the cylinder cooling sleeve are made of two different materials. The heat of the engine is transferred to the cooling water through the two different materials of the cylinder liner and the cylinder cooling sleeve in turn. The thickness is much larger than the wall thickness of the water-cooled engine cylinder liner, which increases the heat transfer resistance of the cylinder liner and reduces the heat transfer capacity of the cylinder block, thus reducing the cooling effect of the engine

(2) The cylinder block has poor manufacturability, which increases development and manufacturing costs

Since the structure of the cylinder block is provided with process openings on the side of the cylinder shell, it is necessary to adopt machining methods on the side of the cylinder shell to ensure the accuracy of the sealing joint surface, so the processability of the cylinder block is poor; at the same time, the cylinder block needs to be newly added. The investment in the mold of the sealing cover and the installation of the cylinder cooling sleeve on the outer surface of the cylinder liner will increase the development and production costs of the engine

(3) There is a hidden danger of water leakage in the cylinder block

The cooling water circulation cavity can only be formed by the contact between the sealing cover and the cylinder shell through the sealing gasket. Therefore, the poor machining accuracy of the sealing joint surface and the aging of the sealing gasket will cause water leakage from the cylinder block. Problems such as piston sticking and cylinder holding due to overheating

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