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Diesel engine thin-wall cylinder casing and its mfg. method

A diesel engine and cylinder liner technology, which is applied in the field of cylinder liner manufacturing, can solve the problems of different properties, occupying the cooling medium circulation channel space, and the undiscovered technical solution cylinder liner requires nodular cast iron varieties, etc., to achieve overall performance improvement and guarantee The effect of reliability and simple process

Inactive Publication Date: 2007-03-28
HUAFENG POWER
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods of cylinder expansion are carried out on the basis of cast iron materials, but their disadvantages are that in order to meet the strength requirements, the wall thickness of the cylinder liner is generally above 6.5mm, and the cylinder cannot be further expanded to increase the power, and the larger wall thickness occupies The circulation channel space of the cooling medium is reduced, the cooling effect of the diesel engine is reduced, and thus the working efficiency of the diesel engine is reduced
[0006] There are also literatures that use ductile iron as the cylinder liner material to improve the strength of the cylinder liner. Because there are many types of ductile iron with different properties, no relatively complete technical solution has been found so far to meet the requirements of the cylinder liner.

Method used

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  • Diesel engine thin-wall cylinder casing and its mfg. method

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Embodiment 1

[0029] Embodiment 1: As shown in the accompanying drawings, the wall thickness of the cylinder liner 1 is 6.0 mm, the material of the cylinder liner body is pearlitic ductile iron, and the pearlite content in the pearlitic ductile iron is 90%.

[0030] The cylinder liner with an inner hole of Ф105mm, according to the reliability requirements, uses an alloy cast iron cylinder liner, and the minimum wall thickness should be above 6.5mm. In the case of the limitation of the cylinder center distance, the cooling channel is greatly reduced, and the wall thickness is 6.0mm. The pearlitic ductile iron cylinder liner has passed the 1000-hour durability test in the laboratory, and the performance of the diesel engine meets the design requirements, and the water temperature is stable within the design range.

Embodiment 2

[0031] Embodiment 2: As shown in the accompanying drawings, the wall thickness of the cylinder liner 1 is 5.0 mm, the material of the cylinder liner body is pearlitic ductile iron, and the pearlite quantity in the pearlitic ductile iron is 80%.

[0032] For cylinder liners with an inner hole of Ф110mm, alloy cast iron cylinder liners are used according to reliability requirements, and the minimum wall thickness should be above 6.5mm. If used in high-power or marine diesel engines, the minimum wall thickness of cylinder liners should be above 7.5mm. When the cylinder center distance is limited and the wall thickness of the alloy cast iron cylinder liner cannot guarantee the reliability requirements, the pearlitic ductile iron liner is used with a wall thickness of 5.0mm. After 1000 hours of durability test in the laboratory, the performance of the diesel engine meets the design requirements and the water temperature is stable. within the design limits.

[0033] After the test, ...

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Abstract

This invention discloses a thin wall cylinder cover of a diesel including a hollow cover, the thickness of the wall of which made of pearlite nodular cast iron is 5.0-6.0mm, the number of the pearlite in it is not less than 80% so as to reach the requirement for expanding cylinders because of increasing power and ensure the reliability of the diesel.

Description

technical field [0001] The invention relates to a diesel engine cylinder liner and also relates to a manufacturing method of the cylinder liner. Background technique [0002] Diesel engines are divided into dry liner diesel engines and wet liner diesel engines according to their cooling methods. Wet liner diesel engines are widely used because of their good manufacturing process and low production cost. For wet cylinder liner diesel engines, under the premise of not changing the cylinder center distance and piston stroke, the size of the cylinder liner inner diameter determines the output power of the diesel engine, so engineers and technicians use the technical means of expanding the cylinder (increasing the cylinder inner diameter) to increase the power of the diesel engine , and thus reduce the manufacturing cost of diesel engines. [0003] A technical means of expanding the cylinder is to expand the inner diameter of the cylinder liner. Due to the limitation of the stre...

Claims

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Application Information

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IPC IPC(8): F02F1/16C22C37/04
Inventor 李友谊陈玲赵瑞安
Owner HUAFENG POWER
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