Straight knurling self-anti-rotation bearing bush

Abstract

The utility model belongs to the field of aviation transmission machinery, and discloses a straight knurling self-anti-rotation bearing bush which is integrally of a cylindrical structure, the outer side of the cylindrical structure is a cylindrical working surface, the working surface is divided into a knurling section and a non-knurling section, the knurling section is arranged on the upper section, and the non-knurling section is arranged on the lower section; wherein the arithmetic mean deviation Ra of the roughness profile of the non-knurling section is less than or equal to 12.5 microns, and the non-knurling section is in small interference fit with a bearing seat; the diameter of the knurled section is larger than that of the non-knurled section by delta, delta = (0.8-1.6) m, and m is a modulus. The anti-rotation device is simple and compact in structure, an anti-rotation pin does not need to be arranged after the bearing bush is pressed into the bearing seat, the anti-rotation device is suitable for being applied to a transmission device without an anti-rotation pin installation space, the straight knurling mode is adopted according to the axial length ratio of 1: 2, damage to the structure of the bearing seat is low, and meanwhile the good anti-rotation effect can be achieved.

Description

Technical Field

[0001] The utility model belongs to the field of aviation transmission machinery, and relates to a steel bearing bushing, in particular to a straight-knurled self-anti-rotation bearing bushing. Background Art

[0002] Aviation transmission machinery is widely used, including aircraft accessory casings, auxiliary power system gearboxes, air turbine starters, etc. For the purpose of weight reduction, such machinery often uses light metals for the support structure, commonly aluminum alloy and magnesium alloy. When the hard bearing steel used for the outer bearing ring is in direct contact with the bearing seats made of aluminum alloy or magnesium alloy, it will cause serious wear of the bearing seats. To avoid this situation, a steel bushing needs to be set between the outer bearing ring and the bearing seat. To prevent the bushing from being rotated by the outer bearing ring, certain measures are required to fix the bushing on the bearing seat, and a bearing bushing with an installation edge or a anti-rotation promotion pin is often used to achieve anti-rotation. However, these two anti-rotation measures require a large installation space and the structure is relatively complex, which is not applicable in some occasions. In view of this situation, the utility model discloses a self-anti-rotation bearing bushing. When in use, only need to press the bushing into the bearing seat, without the need for anti-rotation pins or screw fixation, and it can achieve a good anti-rotation effect. Content of the Utility Model

[0003] The purpose of the utility model: A straight-knurled self-anti-rotation bearing bushing is proposed, with a simple structure and convenient installation. Without the need for anti-rotation pins or screw fixation, it can achieve a good anti-rotation effect.

[0004] The technical solution of the utility model:

[0005] A straight-knurled self-anti-rotation bearing bushing, the whole is a cylindrical structure, the outer side of the cylindrical structure is a cylindrical working surface, the working surface is divided into a knurled section and a non-knurled section, the knurled section is arranged in the upper section, and the non-knurled section is arranged in the lower section; wherein, the arithmetic mean deviation Ra of the roughness profile of the non-knurled section is ≤ 12.5 μm, and it has a small interference fit with the bearing seat; the diameter of the knurled section is larger than that of the non-knurled section by Δ, Δ = (0.8 - 1.6)m, and m is the module.

[0006] Further, the axial length ratio of the knurled section and the non-knurled section on the working surface is 1:2.

[0007] Further, a bearing axial limit ring is provided at the lower end of the bearing bushing, and the bearing axial limit ring can prevent the bearing ring from disengaging from the lower end of the bearing bushing.

[0008] Further, the inner side of the upper end opening of the bearing bushing has an upper guiding angle of 45°, and the outer side of the lower end of the bearing bushing has a lower guiding angle of 45°.

[0009] Furthermore, the knurled section is a straight knurling structure with evenly spaced raised ridges. Specifically, it is processed on a steel bearing bushing with a uniform working surface. The working surface is straight knurled according to an axial length ratio of 1:2. Since knurling causes the metal matrix to bulge into ridge lines, the working diameter of the knurled section is greater than the diameter before knurling by (0.8 - 1.6)m, where m is the module. The interference between the working surface diameter and the inner hole surface of the bearing housing is 0.023μm - 0.064μm, which has a certain anti-rotation effect. The working diameter of the knurled section has a large interference with the bearing housing, and the harder ridges of the steel bearing bushing press indentations on the softer inner ring surface of the bearing housing, playing a major anti-rotation role.

[0010] Furthermore, the interference between the non-knurled section and the inner hole surface of the bearing housing is 0.023 - 0.064μm.

[0011] Furthermore, the external dimensions of the knurled straight lines in the knurled section conform to:

[0012]

[0013] Where h is the height difference between the top of the ridge line of the knurled section and the non-knurled section, the pitch P is the horizontal distance between the tops of adjacent ridge lines, and r is the chamfer at the top and bottom of the ridge line of the knurled section.

[0014] Advantages of the present utility model:

[0015] The present utility model is used in aviation transmission machinery, specifically a straight knurled self-anti-rotation bearing bushing. The bushing adopts a straight knurling process and is straight knurled in approximately one-third of the area on its cylindrical outer surface. After knurling, the working surface is slightly higher than the cylindrical surface before knurling. When the bushing is press-fitted into the bearing housing with interference, the knurled ridge lines press indentations on the inner ring surface of the bearing housing, forming an embedding effect to achieve the anti-rotation purpose.

[0016] This structural design is simple and compact. After the bearing bushing is press-fitted into the bearing housing, there is no need to install an anti-rotation pin, which is suitable for transmission devices without space for installing anti-rotation pins and has great engineering application value.

[0017] This structure adopts a form of straight knurling with an axial length ratio of 1:2, which causes less damage to the structure of the bearing housing and can also achieve a good anti-rotation effect.

[0018] The knurling structure of this structure is directly pressed on the working surface with straight lines, which is convenient for processing. It can be directly pressed out using tooling without the need for a machine tool, and the designed external dimensions of the knurled straight lines can be adapted to different sizes of bushings according to different modules. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 It is a schematic diagram of the guiding angle of the present utility model;

[0021] Figure 3 It is a schematic diagram of the installation structure of the present utility model;

[0022] Wherein, 1 - working surface, 2 - knurled section, 3 - non-knurled section, 4 - axial limiting ring, 5 - upper guiding angle, 6 - lower guiding angle, 7 - bearing seat, 8 - bearing bushing, 9 - bearing, 10 - shaft. Specific embodiments

[0023] The present utility model is realized through the following technical solutions.

[0024] Embodiment 1:

[0025] A straight-knurled anti-rotation bearing bushing, the whole is a cylindrical structure, the outer side of the cylindrical structure is a cylindrical working surface, the working surface is divided into a knurled section and a non-knurled section, the knurled section is arranged in the upper section, and the non-knurled section is arranged in the lower section; wherein, the arithmetic mean deviation Ra of the roughness profile of the non-knurled section is ≤ 12.5 μm, and it is in a small interference fit with the bearing seat; the diameter of the knurled section is larger than that of the non-knurled section by Δ, Δ = (0.8 - 1.6)m, and m is the module.

[0026] The axial length ratio of the knurled section and the non-knurled section on the working surface is 1:2.

[0027] An axial limiting ring for the bearing is provided at the lower end of the bearing bushing, and the axial limiting ring for the bearing can prevent the bearing ring from disengaging from the lower end of the bearing bushing.

[0028] The inner side of the upper opening of the bearing bushing has an upper guiding angle of 45°, and the outer side of the lower end of the bearing bushing has a lower guiding angle of 45°.

[0029] The knurled section is a ridge-like straight-knurled structure with evenly spaced ridges. Specifically, it is processed on a steel bearing bushing with a uniform working surface. The working surface is straight-knurled according to an axial length ratio of 1:2. Since knurling will cause the metal matrix to bulge into a ridge-like shape, the working diameter of the knurled section is larger than the diameter before knurling by (0.8 - 1.6)m, where m is the module. The interference amount between the working surface diameter and the inner hole surface of the bearing seat is 0.023 μm - 0.064 μm, having a certain anti-rotation effect. The working diameter of the knurled section has a larger interference amount with the bearing seat, and the harder ridges of the steel bearing bushing press out indentations on the inner ring surface of the softer bearing seat, playing a major anti-rotation role.

[0030] The interference amount between the non-knurled section and the inner hole surface of the bearing seat is 0.023 - 0.064 μm.

[0031] The external dimensions of the knurled straight pattern of the knurled section conform to:

[0032]

[0033] Among them, h is the height difference between the top of the knurled section ridge line and the non-knurled section, the pitch P is the horizontal distance between the tops of adjacent ridge lines, and r is the chamfer at the top and bottom of the knurled section ridge line.

[0034] Example 2:

[0035] A straight-knurled self-anti-rotation bearing bushing, whose cylindrical working surface 1 includes a knurled section 2 and a non-knurled section 3, an axial limiting ring 4, a guiding angle 5 and a guiding angle 6. The arithmetic mean deviation Ra of the surface roughness profile of the working surface 3 of the non-knurled section is ≤ 12.5 μm, and it has a small interference fit with the bearing seat, having a certain anti-rotation function; the knurled section 2 is pressed on a cylindrical surface with the same diameter and surface roughness as the working surface of the non-knurled section 3. After knurling, the working diameter is larger than the diameter before knurling, and its value Δ≈(0.8 - 1.6)m, where m is the module; the axial length ratio of the knurled section 2 and the non-knurled section 3 on the working surface 1 is about 1:2; one end of the bearing bushing is machined with a bearing axial limiting ring 4 to play a role in bearing limitation; the 45° guiding angle 5 and the 45° guiding angle 6 are respectively opened on the inner side above and the outer side below the bushing to play an assembly guiding role.

[0036] The steel bearing bushing has a cylindrical working surface 1. The working surface 1 is straight-knurled according to an axial length ratio of 1:2. Since knurling will cause the metal matrix to bulge into a ridge shape, the working diameter of the knurled section 2 is larger than the diameter before knurling by (0.8 - 1.6)m, where m is the module. The interference amount between the diameter of the working surface 1 and the inner hole surface of the bearing seat is 0.023 - 0.064 μm, having a certain anti-rotation effect. The working diameter of the knurled section 2 has a larger interference amount with the bearing seat, and the harder ridge line of the steel bearing bushing presses out indentations on the inner ring surface of the softer bearing seat, playing a main anti-rotation role.

[0037] The working surface 1 includes a knurled section 2 and a non-knurled section 3, and the axial length ratio is about 1:2.

[0038] The arithmetic mean deviation Ra of the surface roughness profile of the working surface 1 before knurling is ≤ 12.5 μm, and the interference amount between the diameter of the working surface 1 and the inner hole surface of the bearing seat is 0.023 - 0.064 μm.

[0039] The knurled section 2 is straight-knurled, and the size specifications of the knurling should comply with the regulations.

[0040] The inner diameter of the bearing limiting ring 4 is slightly smaller than the outer diameter of the supporting bearing, playing a role in axial bearing limitation.

[0041] The 45° guiding angle 5 and the 45° guiding angle 6 are respectively opened on the inner side above and the outer side below the bushing to play an assembly guiding role.

[0042] Example 3:

[0043] SeeFigure 3 , which is a scenario where the present utility model is often applied. The working principle is as follows: The bearing housing 7, bearing bushing 8, bearing 9, and shaft 10 form a common support method for the gear shaft system of a transmission machine. Among them, the bearing housing 7 and the bearing bushing 8 are in interference fit to prevent relative rotation between the bearing housing 7 and the bearing bushing 8. The bearing 9 and the shaft 10 are in interference fit to ensure that the bearing 9 rotates with the shaft 10. The bearing bushing 8 and the bearing 9 are in clearance fit to facilitate the axial installation of the assembly composed of the bearing 9 and the shaft 10 into the bearing bushing 8.

[0044] A straight-knurled self-anti-rotation bearing bushing, characterized in that: the cylindrical working surface 1 includes a knurled section 2 and a non-knurled section 3, an axial limit ring 4, a guiding angle 5, and a guiding angle 6. The arithmetic mean deviation Ra of the surface roughness profile of the non-knurled section 3 is ≤ 12.5 μm, and it has a small interference fit with the bearing housing, having a certain anti-rotation function; the knurled section 2 is pressed on a cylindrical surface with the same diameter and surface roughness as the working surface of the non-knurled section 3. After knurling, the working diameter is larger than the diameter before knurling, and its value Δ ≈ (0.8 - 1.6)m, where m is the module; the axial length ratio of the knurled section 2 and the non-knurled section 3 on the working surface 1 is about 1:2; one end of the bearing bushing is processed with an axial limit ring 4 for the bearing to play a role in limiting the bearing; the 45° guiding angle 5 and the 45° guiding angle 6 are respectively opened on the inner side above and the outer side below the bushing to play a role in assembly guidance.

[0045] The specific bearing bushing is as follows: The steel bearing bushing has a cylindrical working surface 1. The working surface 1 is straight-knurled according to an axial length ratio of 1:2. Since knurling will cause the metal matrix to bulge into ridge lines, the working diameter of the knurled section 2 is larger than the diameter before knurling by (0.8 - 1.6)m, where m is the module. The interference amount between the diameter of the working surface 1 and the inner hole surface of the bearing housing is 0.023 - 0.064 μm, having a certain anti-rotation effect. The working diameter of the knurled section 2 has a larger interference amount with the bearing housing, and the harder ridge lines of the steel bearing bushing press out indentations on the inner ring surface of the softer bearing housing, playing a major anti-rotation role.

[0046] The working surface 1 includes a knurled section 2 and a non-knurled section 3, and the axial length ratio is about 1:2.

[0047] The arithmetic mean deviation Ra of the surface roughness profile of the working surface 1 before knurling is ≤ 12.5 μm, and the interference amount between the diameter of the working surface 1 and the inner hole surface of the bearing housing is 0.023 - 0.064 μm.

[0048] The knurled section 2 is straight-knurled. After knurling, the working diameter is larger than the diameter before knurling, and its value Δ ≈ (0.8 - 1.6)m, where m is the module. The external dimensions of the straight knurling should comply with the regulations.

[0049] The inner diameter of the bearing limit ring 4 is slightly smaller than the outer diameter of the supporting bearing, playing a function of axially limiting the bearing.

[0050] The 45° guiding angles 5 and 6 are respectively formed on the inner side above and the outer side below the bushing, and play a role in assembly guiding.

[0051] According to design research, it is found that for the bearing bushing with straight knurling, on the premise of relatively simple machining, a good anti-rotation effect can be achieved, ensuring the realization of the purpose of the present utility model.

[0052] The above embodiments are only used to illustrate the technical concept and features of the present utility model. The purpose is to enable those skilled in the technical field to understand the content of the present utility model and implement it accordingly. It cannot be used to limit the protection scope of the present utility model. Any equivalent transformation or modification made according to the spirit essence of the present utility model should be covered within the protection scope of the present utility model. The technologies, shapes, and structures not described in detail in the present utility model are all well-known technologies.

Claims

1. A straight knurled self-rotation anti-bearing bushing, characterized in that: The overall structure is cylindrical, the outer side of the cylindrical structure is a cylindrical working surface (1), the working surface (1) is divided into a knurled section (2) and a non-knurled section (3), the knurled section (2) is arranged in the upper section, and the non-knurled section (3) is arranged in the lower section; wherein the arithmetic mean deviation Ra of the roughness profile of the non-knurled section (3) is ≤12.5 μm, and has a small interference fit with the bearing seat; the diameter of the knurled section (2) is larger than the diameter of the non-knurled section (3) by Δ, Δ=(0.8-1.6) m, where m is the modulus.

2. A straight knurled self-rotation anti-bearing bushing according to claim 1, characterized in that: The axial length ratio of the knurled section (2) and the non-knurled section (3) on the working surface (1) is 1:

2.

3. The straight knurled self-rotation anti-bearing bushing according to claim 1, characterized in that: The lower end of the bearing bushing is provided with a bearing axial limiting ring (4), and the bearing axial limiting ring (4) can prevent the bearing ring from falling out from the lower end of the bearing bushing.

4. The straight knurled self-rotation anti-rotation bearing bushing according to claim 1, characterized in that: The inner side of the upper end opening of the bearing bushing has an upper guide angle (5) of 45°, and the outer side of the lower end of the bearing bushing has a lower guide angle (6) of 45°.

5. The straight knurled self-rotation anti-bearing bushing according to claim 1, characterized in that: The knurling section (2) is a straight knurling structure with ridges raised at even intervals.

6. A straight knurled self-rotation anti-bearing bushing according to claim 5, characterized in that: The interference between the non-knurled section (3) and the inner hole surface of the bearing seat is 0.023-0.064 μm.

7. The straight knurled self-rotation anti-bearing bushing according to claim 5, characterized in that: The knurled straight line dimensions of the knurled section (2) conform to: Wherein, h is the height difference between the top of the ridge line of the knurled segment (2) and the non-knurled segment (3), the pitch P is the horizontal distance between the tops of adjacent ridge lines, and r is the chamfer of the top and bottom of the ridge line of the knurled segment (2).

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