Slotted lining

Abstract

The utility model relates to the technical field of fasteners, in particular to a slotted bushing, which comprises a bushing straight cylinder, the edge of the cylinder wall of the bushing straight cylinder is staggered at the edge rolling joint, and a flange is arranged at the top of the bushing straight cylinder. According to the slotted lining, firm installation can be guaranteed, and meanwhile the problems that the expansion coefficient of a seamless lining is limited, and the applicable installation hole range is too small are solved.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a slotted bushing. Background Technology

[0002] Currently, seamless bushings are mainly used in the aerospace field. However, due to the fixed diameter of seamless bushings, the expansion of the bushings is limited by the structure and materials. Furthermore, the applicable range of mounting holes is too small, and the effect of increasing the strength of the mounting holes is not significant, which cannot meet the needs of complex installation environments. Utility Model Content

[0003] The purpose of this utility model is to provide a slotted bushing that can solve the problems of limited expansion coefficient and small applicable mounting hole range of seamless bushings while ensuring a firm installation.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A slotted bushing includes a bushing cylinder, the edges of which are staggered at the rolled joint, and a flange is provided at the top of the bushing cylinder.

[0006] As an improvement, the angle range of the flange is 126°50′~131°18′.

[0007] As an improvement, the radius of curvature of the arc surface at the transition connection between the cylinder wall and the flange of the bushing straight cylinder is 0.25mm to 0.35mm.

[0008] As an improvement, the wall thickness of the bushing straight cylinder is 0.15mm to 0.25mm.

[0009] As an improvement, the overall length of the bushing is 4mm to 25mm.

[0010] As an improvement, a lubricating coating is applied to the inner wall of the bushing.

[0011] In summary, this utility model has the following beneficial effects:

[0012] During installation and use, the bushing's diameter can be significantly expanded due to the staggered arrangement of the straight cylinder wall edges at the rolled joint. The size of the expansion can be controlled according to the size of the staggered folding area, which also increases the range of mounting holes. Furthermore, the expansion of the bushing exerts a force on the mounting holes, further increasing the strength of the holes. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this utility model, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present utility model;

[0016] Figure 3 A schematic diagram of the deformed structure after bushing installation;

[0017] Figure 4 This is a schematic cross-sectional view of the deformed structure after the bushing is installed.

[0018] Among them: 1. Bushing straight tube; 2. Flanged edge; 3. Rolled joint; 4. Transition joint. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Please refer to Figures 1-4 A slotted bushing includes a bushing cylinder 1, the edges of the cylinder wall 1 being staggered at the rolled joint 3, and a flange 2 being provided at the top of the bushing cylinder 1. In this embodiment, the bushing is formed entirely of high-strength stainless steel material 12Cr17Ni7.

[0021] During installation and use, because the edges of the bushing straight cylinder 1 are staggered at the rolled joint 3, the diameter of the bushing can be greatly expanded during installation. The size of the expansion can be controlled according to the size of the staggered folding area, which also increases the range of the mounting hole. Furthermore, the expansion of the bushing exerts a force on the mounting hole, further increasing the strength of the hole.

[0022] The angle range of the flange 2 is 126°50′~131°18′. The radius of curvature of the arc surface at the transition connection 4 between the cylinder wall of the bushing straight cylinder 1 and the flange 2 is 0.25mm~0.35mm.

[0023] The maximum diameter of the slotted bushing after expansion is 7.079 mm, the slot distance after expansion ranges from 0.10 mm to 0.30 mm, and the suitable mounting hole range is 7.188 mm to 7.264 mm.

[0024] The wall thickness of the bushing cylinder 1 is 0.15mm to 0.25mm. The overall length of the bushing is 4mm to 25mm.

[0025] A lubricating coating is applied to the inner wall of the bushing. In this embodiment, the coating material is molybdenum disulfide, the coating thickness is 5µm to 10µm, it has strong stability, and it is attached to the inner surface of the bushing in the form of fine particles.

[0026] The edges of the bushing cylinder 1 are staggered at the rolled joint 3. The flange 2 and the lubricating coating on the inner wall allow the bushing to achieve an interference fit with the mounting hole by utilizing the expansion generated during installation, while ensuring installation performance. This increases the strength of the hole. At the same time, a molybdenum disulfide coating is selected as the base coating. Under average load capacities of 14000N and 4800N, the starting friction coefficient is 0.05 to 0.06, the stable friction coefficient is 0.01 to 0.02, and the coating thickness is 5um to 10um. The fit between the bottom flange 2 and the inner wall coating ensures that there is no jamming or significant increase in pull-out force during use.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A slotted bushing characterized by, The device includes a bushing cylinder, wherein the edges of the cylinder wall are staggered at the rolled joint, and a flange is provided at the top of the bushing cylinder; the angle of the flange ranges from 126°50′ to 131°18′; the radius of curvature of the arc surface at the transition connection between the cylinder wall and the flange is 0.25mm to 0.35mm; and the wall thickness of the bushing cylinder is 0.15mm to 0.25mm.

2. The slotted liner according to claim 1, characterized in that, The overall length of the bushing is 4mm to 25mm.

3. The slotted liner according to claim 1, wherein, A lubricating coating is applied to the inner wall of the bushing.

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