Unmanned aerial vehicle low-friction self-aligning roller bearing

Abstract

The utility model is suitable for bearing technical field provides a kind of unmanned plane low friction self-aligning roller bearing, including, bearing outer ring, the bearing outer ring is set to hollow circular ring structure;Bearing inner ring, the bearing inner ring is set to hollow circular ring type structure;Retainer, the retainer is set between bearing outer ring and bearing inner ring, the retainer includes two groups of retainer end face that set up in place, the retainer end face is set to annular structure, a plurality of groups of limit slots are set on the retainer end face around the position of circle center, the limit slot is inclined to the position of circle center and is set, and each group limit slot corresponding position is equipped with convex point, the convex point is set to flexible material, and the retainer end face outer wall is fixedly connected with frame body;Roller, the roller is set to cylindrical structure, and the roller is set between retainer and bearing outer ring.The device solves the uneven contact of roller operation and raceway, thereby causing local wear aggravation, the problem of self-aligning precision drop.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and more specifically, to a low-friction self-aligning roller bearing for unmanned aerial vehicles (UAVs). Background Technology

[0002] The widespread application of drones in low-altitude logistics, aerial surveying, emergency rescue and other fields has placed higher demands on the performance of core components. As a key component for drone power transmission and attitude control, the performance of low-friction self-aligning roller bearings directly affects the flight stability, endurance and adaptability of drones under operating conditions.

[0003] Existing drone bearings mostly use ball bearings or fixed-curvature roller bearings. While these structures can meet basic rotational support functions, contact angle deviations can easily occur between the rolling elements and raceways during high-speed rotation and attitude changes. When the drone is affected by external load fluctuations, assembly eccentricity, or instantaneous vibrations, the rolling elements cannot adjust the force direction in time, leading to contact stress concentration. This, in turn, causes problems such as accelerated raceway wear, increased noise, and increased frictional resistance, and in severe cases, even premature bearing failure.

[0004] Furthermore, the traditional fixed curvature raceway design cannot achieve self-alignment. If a slight tilt or deformation occurs during the flight of the drone, the rolling elements of the bearing will experience unilateral force, which will shorten the bearing life and increase energy consumption.

[0005] Therefore, based on the above problems, this application proposes a low-friction self-aligning roller bearing for unmanned aerial vehicles. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a low-friction self-aligning roller bearing for unmanned aerial vehicles.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A low-friction self-aligning roller bearing for unmanned aerial vehicles (UAVs) includes:

[0009] The bearing outer ring is configured as a hollow circular ring structure;

[0010] The bearing inner ring is configured as a hollow circular ring structure.

[0011] A cage is disposed between the outer ring and the inner ring of a bearing. The cage includes two sets of cage end faces that fit together. The cage end faces are configured as annular structures. Several sets of limiting grooves are formed around the center position on the cage end faces. The limiting grooves are inclined towards the center position. A protrusion is installed at a corresponding position of each set of limiting grooves. The protrusions are made of flexible material. A frame body is fixedly connected to the outer wall of the cage end face.

[0012] The roller is configured as a cylindrical structure and is disposed between the cage and the outer ring of the bearing.

[0013] The present invention is further configured such that: the end face of the retainer includes a limiting ring, the diameter of the limiting ring is smaller than the diameter of the end face of the retainer, and a plurality of inclined columns are fixedly connected to the limiting ring.

[0014] The present invention is further configured such that: the inclined column is arranged around the center, the inclined column is inclined inward, and the inclined column is fixedly connected to the end face of the retainer.

[0015] The present invention is further configured such that: an inner ring waistline is formed around the outer wall of the inner ring of the bearing, and inner ring raceways are symmetrically formed on both sides of the inner ring waistline. The inner ring raceways are configured as arc-shaped structures, and an inner ring end face is formed at the end of each set of inner ring raceways away from the inner ring waistline.

[0016] The present invention is further configured such that a groove is provided at the center of the outer wall of the outer ring of the bearing.

[0017] The present invention is further configured such that an outer raceway is formed around the inner wall of the outer ring of the bearing.

[0018] The present invention is further configured such that: the roller is mounted on the limiting groove, and the roller is relatively inclined toward the center.

[0019] The present invention is further configured such that: roller concave surfaces are provided at both ends of the roller, and the roller concave surfaces are abutting against the convex points.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] 1. This application utilizes the cooperation between the cage and the cam to provide flexible guiding constraints when the rollers experience angular misalignment during self-alignment, resulting in smoother roller movement. When the UAV encounters sudden conditions such as gusts of wind or sharp turns, the cam can limit and buffer the instantaneous misalignment of the rollers, preventing rigid collisions between the rollers and the cage, reducing vibration and noise, and ensuring stable roller movement trajectory during self-alignment. This effectively improves bearing operating accuracy and ensures the stability of UAV attitude control. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a low-friction self-aligning roller bearing for unmanned aerial vehicles according to this utility model.

[0023] Figure 2 This is an exploded view of a low-friction self-aligning roller bearing for unmanned aerial vehicles (UAVs) according to this utility model.

[0024] Figure 3 This is a schematic diagram of the cage structure in this utility model.

[0025] Figure 4 This is a schematic diagram of the structure of the bearing inner ring in this utility model.

[0026] Figure 5 This is a top view of a low-friction self-aligning roller bearing for unmanned aerial vehicles according to this utility model.

[0027] Figure 6 for Figure 5 A sectional view taken along section line AA.

[0028] Explanation of reference numerals in the attached drawings: 1. Bearing outer ring; 11. Outer ring raceway; 12. Slot;

[0029] 2. Bearing inner ring; 21. Inner ring end face; 22. Inner ring raceway; 23. Inner ring waistline;

[0030] 3. Cage; 31. Cage end face; 311. Limiting groove; 32. Protrusion; 33. Frame body; 331. Inclined column; 332. Limiting ring;

[0031] 4. Roller; 42. Roller concave surface. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] Example 1, please refer to Figure 1-6 The present invention provides the following technical solution:

[0035] Specifically, it refers to a low-friction self-aligning roller bearing for unmanned aerial vehicles (UAVs), comprising: an outer bearing ring 1, an inner bearing ring 2, a cage 3, and rollers 4. The outer bearing ring 1 is located on the outermost layer, and the inner bearing ring 2 is disposed inside the outer bearing ring 1. A cage 3 is installed between the outer bearing ring 1 and the inner bearing ring 2. The inner wall of the cage 3 abuts against the outer wall of the inner bearing ring 2, and the outer wall of the cage 3 abuts against the inner wall of the outer bearing ring 1. Rollers 4 are mounted on the cage 3.

[0036] See Figure 1 The bearing outer ring 1 is configured as a hollow annular structure; a groove 12 is provided at the center of the outer wall of the bearing outer ring 1 to form a fitting and fixing structure with the UAV power system mounting base, thereby maintaining coaxiality and stability during high-speed rotation. An outer ring raceway 11 is provided around the inner wall of the bearing outer ring 1.

[0037] See Figure 2 , Figure 4 The bearing inner ring 2 is configured as a hollow annular structure, with a through hole for mounting a rotating shaft to ensure lightweight construction and ease of assembly. An inner ring waistline 23 is formed around the outer wall of the bearing inner ring 2. This waistline 23 enhances the structural strength of the inner ring and serves as a positioning reference for the raceways. Inner ring raceways 22 are symmetrically formed on both sides of the waistline 23, and an inner ring end face 21 is formed at the end of each set of raceways 22 furthest from the waistline 23.

[0038] Preferably, the inner raceway 22 is configured with an arc-shaped structure, and the curvature of the inner raceway 22 gradually decreases from the inside to the outside, enabling the roller 4 to automatically adjust its posture according to the direction of force during operation. By setting the curvature variation of the inner raceway 22, the roller 4 can automatically adjust its posture according to the force conditions during operation, achieving micro-angle self-alignment and avoiding uneven contact between the roller and the raceway.

[0039] Meanwhile, the presence of the inner raceway 22 can also form an oil film guiding zone, making the lubricating oil more evenly distributed in the rolling contact area, reducing frictional resistance and heat generation, and delaying the rupture of the lubricating oil film.

[0040] A cage 3 is disposed between the outer ring 1 and the inner ring 2 of the bearing. The cage 3 includes two sets of cage end faces 31 that fit together. The cage end faces 31 are annular structures used to support the rollers 4 and define their positions. Several sets of limiting grooves 311 are formed around the center of the cage end faces 31. The limiting grooves 311 are inclined towards the center. Each set of limiting grooves 311 has a corresponding protrusion 32 installed. The protrusions 32 are made of flexible material to provide cushioning support for the rollers. In this embodiment, they are preferably made of rubber. A frame body 33 is fixedly connected to the outer wall of the cage end faces 31. The frame body 33 is made of high-strength, heat-resistant material. In this embodiment, it is preferably made of carbon fiber reinforced polyamide material to withstand the centrifugal load and vibration impact under the high-speed rotation of the UAV motor.

[0041] The cage end face 31 includes a limiting ring 332, the diameter of which is smaller than the diameter of the cage end face 31. Several sets of inclined columns 331 are fixedly connected to the limiting ring 332. The inclined columns 331 are arranged around the center and are inclined inward. The inclined columns 331 are fixedly connected to the end face of the cage end face 31 to form a guide support surface that matches the movement trajectory of the roller.

[0042] With this structure, when the rollers deviate at an angle during self-alignment, the inclined pin 331 can provide flexible guiding constraints, making the roller movement smoother. When the UAV encounters sudden conditions such as gusts of wind or sharp turns, the protrusion 32 can limit and buffer the instantaneous deviation of the rollers, preventing rigid collisions between the rollers 4 and the cage 3, reducing vibration and noise, and ensuring the stability of the roller 4's movement trajectory during self-alignment, effectively improving the bearing's operating accuracy and ensuring the stability of the UAV's attitude control.

[0043] The roller 4 is a cylindrical structure and is positioned between the cage 3 and the outer ring 1 of the bearing. The roller 4 is mounted on the limiting groove 311 and is inclined towards the center to achieve automatic self-aligning. Concave surfaces 41 are formed at both ends of the roller 4, abutting against the protrusions 32. Through the flexible contact between the concave surfaces 41 and the protrusions 32, a slight self-adjusting clearance can be formed during roller rotation, thereby further reducing frictional resistance and improving rolling stability and durability.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-friction self-aligning roller bearing for unmanned aerial vehicles (UAVs), characterized in that: include: The bearing outer ring (1) is configured as a hollow circular ring structure; The bearing inner ring (2) is configured as a hollow circular ring structure; A retainer (3) is disposed between the outer ring (1) and the inner ring (2) of the bearing. The retainer (3) includes two sets of retainer end faces (31) that fit together. The retainer end faces (31) are configured as annular structures. Several sets of limiting grooves (311) are opened around the center position on the retainer end faces (31). The limiting grooves (311) are inclined towards the center position. A protrusion (32) is installed at the corresponding position of each set of limiting grooves (311). The protrusions (32) are made of flexible material. A frame body (33) is fixedly connected to the outer wall of the retainer end faces (31). Roller (4), the roller (4) is configured as a cylindrical structure, the roller (4) is disposed between the cage (3) and the outer ring (1) of the bearing.

2. The low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 1, characterized in that: The cage end face (31) includes a limiting ring (332), the diameter of which is smaller than the diameter of the cage end face (31), and several sets of inclined columns (331) are fixedly connected to the limiting ring (332).

3. The low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 2, characterized in that: The inclined column (331) is arranged around the center, the inclined column (331) is inclined inward, and the inclined column (331) is fixedly connected to the end face (31) of the cage.

4. The low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 1, characterized in that: The bearing inner ring (2) has an inner ring waistline (23) formed around its outer wall. The inner ring waistline (23) has inner ring raceways (22) formed symmetrically on both sides. The inner ring raceways (22) are set in an arc shape. Each set of inner ring raceways (22) has an inner ring end face (21) formed at the end away from the inner ring waistline (23).

5. A low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 1, characterized in that: A groove (12) is provided at the center of the outer wall of the bearing outer ring (1).

6. A low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 5, characterized in that: The inner wall of the outer ring (1) of the bearing is provided with an outer ring raceway (11).

7. A low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 1, characterized in that: The roller (4) is installed on the limiting groove (311), and the roller (4) is relatively inclined towards the center.

8. A low-friction self-aligning roller bearing for unmanned aerial vehicles according to claim 7, characterized in that: The roller (4) has concave surfaces (41) at both ends, and the concave surfaces (41) abut against the protrusions (32).

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