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Self-locking threaded sleeve

A threaded sleeve and self-locking technology, which is applied in the direction of screws, nuts, bolts, etc., can solve the problems of increased engine occupation space, increased engine weight, and increased engine spindle, achieving the goal of reducing occupied space, reducing length, and increasing friction Effect

Pending Publication Date: 2021-04-02
河南航天精工制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-locking screw sleeve to solve the technical problems of increasing the weight of the engine, increasing the main shaft of the engine, and increasing the space occupied by the engine due to the axial fixation of the engine bearing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0029] In this embodiment, the self-locking threaded sleeve is mainly used in aero-engines, and cooperates with the internal threaded holes in the preset perforations on the aero-engine case 1 to realize the axial positioning of the bearing 3 on the main shaft 2 in the case 1 , and can also ensure that the bearing 3 will not move axially on the main shaft 2 when the main shaft 2 is running at high speed.

[0030] In other embodiments, the self-locking threaded sleeve of this embodiment can also be applied in automobiles and other application fields where the axial positioning of the bearing 3 on the high-speed running spindle is required.

[0031] In this example, if Figure 1 to Figure 2 As shown, the self-locking threaded sleeve is a cylindrical structure with openings at both ends. The cylindrical structure includes a ring sleeve 4. The outer peripheral surface of the ring sleeve 4 is provided with an external thread 7 of the ring sleeve, and the self-locking threaded sleev...

specific Embodiment 2

[0040] The difference between it and the specific embodiment 1 is that no radial groove is provided on the radial inner side of the axial protrusion, the radial section of the axial protrusion is an inline structure extending toward the axial direction, and the diameter of the axial protrusion is The axial thickness is set uniformly in the axial direction, and the radial thickness of the axial protrusion is smaller than the radial thickness of the ring sleeve. During the processing of the self-locking screw insert, it is necessary to turn and mill the inner peripheral surface corresponding to the position of the axial protrusion, so as to make the radial thickness of the axial protrusion thinner.

specific Embodiment 3

[0042] The difference between it and the specific embodiment 1 is that the number of axial slots on the self-locking screw sleeve is set to three, and the three axial slots are evenly spaced in the circumferential direction, and there is no radial slot on the self-locking screw sleeve. The two axial protrusions are arranged oppositely, but each axial protrusion has a symmetry plane passing through the axis of the collar, and both circumferential end surfaces of the axial protrusions are parallel to the symmetry plane.

[0043] In other embodiments, the number of axial slots can be set to two, four, five, or more than seven, and only an even number of axial slots is provided in the self-locking screw sleeve with radially opposite axial slots. The two axial projections arranged radially opposite share a plane of symmetry, and the two axial projections arranged radially opposite each have a coplanar circumferential end surface, so that the two coplanar circumferential end surfaces...

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Abstract

The invention relates to a self-locking threaded sleeve. The self-locking threaded sleeve comprises a ring sleeve, axial grooves are formed in the end face of one axial side of the self-locking threaded sleeve at intervals in the circumferential direction, an axial protrusion is formed between every two adjacent axial grooves, a ring sleeve outer thread is arranged on the outer circumferential face of the ring sleeve, and a protrusion outer thread in bolt connection with the ring sleeve outer thread is arranged on the outer circumferential face of each axial protrusion. At least one axial protrusion inclines towards the radial outer side to form an inclined protrusion, the ring sleeve outer thread and the protrusion outer threads are used for being matched with an inner thread on a casing,the inclined protrusion is used for being in expansion fit with an inner thread hole section on the casing, and the axial end face of the ring sleeve is used for being stopped with a bearing on a main shaft. The inclined protrusions can increase the radial extrusion effect between the self-locking threaded sleeve and the casing, so that self-locking of the self-locking threaded sleeve is achieved, axial positioning assembly of the bearing is achieved through the self-locking threaded sleeve, the shaft does not need to extend out of the casing, the length of an engine main shaft can be reduced, and the occupied space of an engine is reduced.

Description

technical field [0001] The invention relates to a self-locking screw sleeve. Background technique [0002] Domestic aero-engine bearings are mostly fixed axially by a combination of cotter pins and slotted nuts or stop washers and compression nuts. [0003] The disadvantage of the combination of the cotter pin and the slotted nut is that it is necessary to slot the shaft to pass through the cotter pin, which results in weakening the strength of the shaft, and the reliability of this method depends entirely on the strength of the cotter pin; The combination of the stop washer and the compression nut is safer than the combination of the cotter pin and the slotted nut, but this combination increases the weight of the engine. [0004] At the same time, in the process of adopting the above two combination methods to realize the axial fixing of the bearing, it is necessary to make the main shaft of the engine protrude from the casing, which undoubtedly increases the length of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C35/07F16B37/00F16B39/284F02C7/06
CPCF16C35/07F16B37/00F16B39/284F02C7/06
Inventor 刘前峰付建建石大鹏韦波安蒙谢茂阳屈明亮何坤李蓓蕾张瑜萍
Owner 河南航天精工制造有限公司