Novel ball and roller combined bearing in robot planetary reducer

Abstract

The utility model relates to the technical field of bearings, and discloses a novel ball and roller combined bearing in a robot planetary reducer, which comprises a rotating shaft, the outer wall of the rotating shaft is fixedly connected with a spline, the outer wall of the spline is provided with a rotating mechanism, one end of the rotating shaft is fixedly connected with a positioning plate, and the other end of the rotating shaft is fixedly connected with a bearing. The rotating mechanism comprises a bearing inner ring, two sealing grooves are formed in the inner wall of the bearing inner ring, two sealing plates are rotatably connected to the inner wall of the bearing inner ring, a plurality of rolling grooves are formed in the inner wall of the bearing inner ring, a sliding groove is formed in the inner wall of the bearing inner ring, and the sliding groove is connected with the bearing inner ring. And rotating assemblies are mounted on the outer walls of the two sealing plates. According to the utility model, by adopting the structure that the steel balls and the rollers are arranged in a staggered manner, the defects that the bearing capacity of an all-steel ball bearing is limited and the precision of an all-roller bearing is insufficient are overcome, the precision can be ensured, the service life of the bearing can be prolonged, and the problem that the service life of the bearing is relatively short in a small-space and large-load scene is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to a novel bearing combining ball and roller in a robot planetary reducer. Background Technology

[0002] Bearings are essential components in modern machinery. Their main function is to support rotating mechanical parts, reduce the coefficient of friction during movement, and ensure rotational accuracy. Based on the frictional properties of the moving elements, bearings can be broadly classified into rolling bearings and sliding bearings. Rolling bearings are standardized and serialized, but compared to sliding bearings, they have larger radial dimensions, higher vibration and noise levels, and are also more expensive. Bearing cages are also among the most fragile components, prone to failure under immense pressure and vibration.

[0003] Bearings are core components in mechanical engineering. Their core function is to reduce the coefficient of friction during mechanical rotation, reduce energy loss, support the shaft and parts on the shaft to maintain stable rotation, ensure efficient operation of machinery, extend equipment life, and improve the motion accuracy of precision machinery such as machine tools and instruments. They also help to miniaturize and lighten various types of machinery. In the fields of automobiles, wind power, and aerospace, they directly affect the performance and safety of the whole machine and are an indispensable basic component for modern industrial development.

[0004] In existing technologies, the use of rolling bearings is limited in applications with limited space. For example, in situations where space is limited but load is high, rolling bearings of the appropriate specifications cannot support the load. In addition, rolling bearings generate significant vibration and noise during operation, especially after prolonged use. Therefore, rolling bearings are not suitable for applications requiring high precision and where vibration and noise are unacceptable. To address these issues, a novel ball-roller combined bearing for robot planetary reducers is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a novel ball and roller combined bearing for robot planetary reducers, aiming to improve the problems of rolling bearings being unable to withstand large loads and cages being prone to breakage in the limited space of existing robot planetary reducers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel ball-roller combined bearing for a robot planetary reducer includes a rotating shaft, a spline fixedly connected to the outer wall of the rotating shaft, a rotating mechanism mounted on the outer wall of the spline, and a positioning plate fixedly connected to one end of the rotating shaft.

[0008] The rotating mechanism includes a bearing inner ring, each bearing inner ring having two sealing grooves on its inner wall, each bearing inner ring having two sealing plates rotatably connected to its inner wall, each bearing inner ring having multiple rolling grooves on its inner wall, each bearing inner ring having a sliding groove on its inner wall, and rotating components mounted on the outer walls of the two sealing plates.

[0009] As a further description of the above technical solution:

[0010] The rotating assembly includes a bearing outer ring, with multiple steel balls slidably connected to the inner wall of the bearing outer ring, and multiple rollers slidably connected to the inner wall of the bearing outer ring.

[0011] As a further description of the above technical solution:

[0012] The outer wall of the spline is slidably connected to the inner wall of the inner ring of the bearing, and the outer walls of the two sealing plates are rotatably connected to the inner walls of the two sealing grooves.

[0013] As a further description of the above technical solution:

[0014] The outer walls of the two sealing plates are rotatably connected to the inner wall of the outer ring of the bearing, and the outer walls of the plurality of steel balls are slidably connected to the inner wall of the inner ring of the bearing.

[0015] As a further description of the above technical solution:

[0016] The outer walls of the plurality of steel balls are slidably connected to the inner walls of the plurality of rolling grooves, and the outer walls of the plurality of rollers are slidably connected to the inner wall of the bearing inner ring;

[0017] As a further description of the above technical solution:

[0018] The outer walls of the plurality of rollers are slidably connected to the inner wall of the sliding groove, and the outer wall of the positioning plate is fixedly connected to the outer wall of the spline.

[0019] This utility model has the following beneficial effects:

[0020] In this invention, a small gap is maintained between the rollers and the outer ring, which can avoid stress during forward and reverse rotation and meet the load-bearing requirements. The steel balls are interference-fitted with the outer ring to achieve zero-gap contact, thereby ensuring the running accuracy of the reducer. This structure effectively makes up for the defects of a single structure. If only steel balls are used, the load-bearing capacity is limited. If only rollers are used, the accuracy is difficult to guarantee. The combination of steel balls and rollers can enhance the bearing life without sacrificing accuracy, and successfully solves the problem of low rolling bearing life in small space and high load scenarios. Attached Figure Description

[0021] Figure 1This is a three-dimensional schematic diagram of a novel bearing combining ball and roller components in a robot planetary reducer proposed in this utility model.

[0022] Figure 2 This is a schematic diagram of the sealing plate of a novel bearing combining ball and roller in a robot planetary reducer proposed in this utility model.

[0023] Figure 3 This is a schematic diagram of the steel ball structure of a novel bearing combining ball and roller in a robot planetary reducer proposed in this utility model.

[0024] Figure 4 This is a schematic diagram of the spline structure of a novel bearing combining ball and roller combinations in a robot planetary reducer proposed in this utility model.

[0025] Legend:

[0026] 1. Rotating shaft; 2. Spline; 3. Rotating mechanism; 31. Inner ring of bearing; 32. Sealing groove; 33. Sealing plate; 34. Rolling groove; 35. Sliding groove; 36. Rotating assembly; 361. Outer ring of bearing; 362. Steel ball; 363. Roller body; 4. Positioning plate. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides an embodiment of a novel ball and roller combined bearing for a robot planetary reducer, comprising a rotating shaft 1. The rotating shaft 1 serves as the core component for power transmission. A spline 2 fixedly connected to its outer wall enables torque transmission with an external drive device. A rotating mechanism 3 is installed on the outer wall of the spline 2. The rotating mechanism 3 achieves flexible rotation through the cooperation between the bearing inner ring 31 and the rotating shaft 1, while bearing radial and axial loads. A positioning plate 4 is fixedly connected to one end of the rotating shaft 1. The positioning plate 4 restricts the axial displacement of the bearing inner ring 31 through its fixed connection with the spline 2, ensuring the stability of the overall structure.

[0029] The rotating mechanism 3 includes a bearing inner ring 31, which serves as the supporting foundation for the rotating mechanism 3. The sealing groove 32 on its inner wall and the slidingly connected sealing plate 33 form a sealing structure to prevent lubricant leakage and prevent external impurities from entering. The inner wall of the bearing inner ring 31 has two sealing grooves 32. The cooperation between the sealing grooves 32 and the sealing plates 33 can maintain a dynamic seal during rotation, reduce wear caused by lubrication failure, and extend the bearing life. The inner wall of the bearing inner ring 31 is rotatably connected to two sealing plates 33. The sealing plates 33 rotate synchronously with the bearing inner ring 31 through precise cooperation with the sealing grooves 32, while maintaining the sealing protection of the bearing interior.

[0030] Multiple rolling grooves 34 are formed on the inner wall of the bearing inner ring 31. The design of the rolling grooves 34 and the interference fit of the steel balls 362 form a zero-clearance contact to ensure rotational accuracy and rigidity. The inner wall of the bearing inner ring 31 is provided with sliding grooves 35, which provide axial sliding space for the rollers 363, allowing small clearances to exist to balance load-bearing capacity and stress distribution. Rotating components 36 are installed on the outer walls of the two sealing plates 33. The rotating components 36 realize power transmission through the relative rotation of the bearing outer ring 361 and the bearing inner ring 31. At the same time, they integrate the composite load-bearing structure of steel balls 362 and rollers 363. The rotating components 36 include the bearing outer ring 361, which serves as the external support of the rotating components 36. The steel balls 362 and rollers 363 slidably connected on their inner walls form a composite rolling element structure, which takes into account both high precision and high load-bearing capacity.

[0031] Multiple steel balls 362 are slidably connected to the inner wall of the bearing outer ring 361. The interference fit between the steel balls 362 and the bearing outer ring 361 eliminates clearance and ensures precision transmission during rotation. Simultaneously, the load is distributed through a four-point contact structure. Multiple rollers 363 are slidably connected to the inner wall of the bearing outer ring 361. The small clearance fit between the rollers 363 and the bearing outer ring 361 ensures load-bearing capacity while avoiding stress concentration during forward and reverse rotation, thus improving bearing life. The outer wall of the spline 2 is slidably connected to the inner wall of the bearing inner ring 31. The outer walls of the sealing plates 33 are rotatably connected to the inner walls of the two sealing grooves 32. The outer walls of the two sealing plates 33 are rotatably connected to the inner walls of the bearing outer ring 361. The outer walls of the multiple steel balls 362 are slidably connected to the inner walls of the bearing inner ring 31. The outer walls of the multiple steel balls 362 are slidably connected to the inner walls of the multiple rolling grooves 34. The outer walls of the multiple rollers 363 are slidably connected to the inner walls of the bearing inner ring 31. The outer walls of the multiple rollers 363 are slidably connected to the inner walls of the sliding grooves 35. The outer wall of the positioning plate 4 is fixedly connected to the outer wall of the spline 2.

[0032] Working principle: When ball and roller bearings need to be combined, this new type of bearing is arranged with a row of steel balls 362 and a row of rollers staggered. Gaps between the rollers 363 and the outer ring will affect accuracy; no gap will generate stress during forward and reverse rotation. Therefore, the rollers 363 use a small gap to achieve load-bearing capacity. The steel balls 362 and the outer ring use an interference fit to ensure zero gap between the steel balls 362 and the outer ring, thus ensuring the accuracy of the reducer. If only steel balls 362 are used as bearings, their load-bearing capacity is limited; if only roller bearings 363 are used, the accuracy of the reducer cannot be guaranteed. The bearing structure combining rollers 363 and steel balls 362 can achieve both reduced reducer accuracy and increased bearing life, solving the problem of low rolling bearing life under small space and high load conditions.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel ball-roller combined bearing for a robot planetary reducer, comprising a rotating shaft (1), characterized in that: A spline (2) is fixedly connected to the outer wall of the rotating shaft (1), a rotating mechanism (3) is installed on the outer wall of the spline (2), and a positioning plate (4) is fixedly connected to one end of the rotating shaft (1). The rotating mechanism (3) includes a bearing inner ring (31), the inner wall of the bearing inner ring (31) is provided with two sealing grooves (32), the inner wall of the bearing inner ring (31) is rotatably connected with two sealing plates (33), the inner wall of the bearing inner ring (31) is provided with multiple rolling grooves (34), the inner wall of the bearing inner ring (31) is provided with sliding grooves (35), and the outer walls of the two sealing plates (33) are equipped with rotating components (36).

2. The novel ball-roller combined bearing in a robot planetary reducer according to claim 1, characterized in that: The rotating assembly (36) includes a bearing outer ring (361), the inner wall of which is slidably connected with a plurality of steel balls (362), and the inner wall of which is slidably connected with a plurality of rollers (363).

3. A novel ball-roller combined bearing for a robot planetary reducer according to claim 2, characterized in that: The outer wall of the spline (2) is slidably connected to the inner wall of the bearing inner ring (31), and the outer walls of the two sealing plates (33) are rotatably connected to the inner walls of the two sealing grooves (32).

4. A novel ball-roller combined bearing for a robot planetary reducer according to claim 2, characterized in that: The outer walls of the two sealing plates (33) are rotatably connected to the inner wall of the outer ring (361) of the bearing, and the outer walls of the plurality of steel balls (362) are slidably connected to the inner wall of the inner ring (31) of the bearing.

5. A novel ball-roller combined bearing for a robot planetary reducer according to claim 2, characterized in that: The outer walls of the plurality of steel balls (362) are slidably connected to the inner walls of the plurality of rolling grooves (34), and the outer walls of the plurality of rollers (363) are slidably connected to the inner wall of the bearing inner ring (31).

6. A novel ball-roller combined bearing for a robot planetary reducer according to claim 2, characterized in that: The outer walls of the plurality of rollers (363) are slidably connected to the inner wall of the sliding groove (35), and the outer wall of the positioning plate (4) is fixedly connected to the outer wall of the spline (2).

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