Method for repairing threads on liquid seal shell

Abstract

The invention aims to provide a method for repairing threads on a liquid seal shell. The method is characterized in that the threads on the liquid seal shell are repaired by completely increasing pitch diameters of threads of threaded sleeves and holes, three repairing groups are added on the basis that the values of thread fit tolerances of the three repairing groups are consistent with the value of the thread fit tolerance of the original group, and requirements on the three added repairing groups comprise that (1) the nominal values of the major diameter, the pitch diameter and the minor diameter of each added repairing group are the same as the nominal values of the major diameter, the pitch diameter and the minor diameter of threads of the original group; (2) the grouping interference value of the pitch diameter of each repairing group is the same as the grouping interference value of the pitch diameter of the original group; and (3) the pitch diameters of the threads of the threaded sleeves and the holes of the added groups are increased. The method is used for repairing the threads by increasing the pitch diameters of the threads under the conditions that the structure, the strength and the reliability of an external accessory case shell are unaffected, the oil leakage fault at a joint of ventilating tubes of an external accessory case is removed, the tightness of the shell is guaranteed, and an engine can be repaired and assembled smoothly.

Description

technical field [0001] The invention relates to engine repair technology, and in particular provides a new method for repairing threads on a liquid-tight housing. Background technique [0002] Whether there is oil leakage at the joint of the vent pipe of the external accessory casing is an important parameter affecting the engine assembly. When the thread sleeve of the external accessory casing is loose, it is usually repaired by increasing the thread diameter specification. For example, if the M20 thread is damaged, repair it to M22. However, due to the limitation of the casing structure of the external accessory case, the side distance between the wire sleeve and the casing is small, the maximum side distance is 6mm, and the side distance is too small to be repaired by increasing the diameter specification. [0003] The oil leakage failure of an external accessory casing is one of the common failures that restrict the smooth delivery of an engine and affect the reliability...

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Problems solved by technology

[0002] Whether there is oil leakage at the joint of the vent pipe of the external accessory casing is an important parameter affecting the engine assembly. When the thread sleeve of the external accessory casing is loose, it is usually repaired by increasing the thread diameter specification. For example, if the M20 thread is damaged, repair it to M22. However, due to the limitation of the shell structure of the external accessory casing, the side distance between the wire sleeve and the case is small, the maximum side distance is 6mm, and the side distance is too small to be repaired by increasing the diameter specification.

[0003] The oil leakage failure of an external accessory casing is one of the common failures that restrict the smooth delivery of an engine and affect the reliability of the engine. According to statistics, there are a certain number of failures every year, which brings losses to the factory. The cause of the failure and Solution, there is no public effective solution yet

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