Harmonic speed reducer bearing retainer

Abstract

The utility model provides a harmonic speed reducer bearing retainer, which belongs to the field of harmonic transmission flexible bearings and comprises an annular retainer end ring and a plurality of window beams arranged along the circumference of the retainer end ring at equal intervals, one end of each window beam is connected with the retainer end ring, and open pockets for accommodating rolling bodies are formed between the adjacent window beams. The window beam is provided with the turnup fins facing the outer ring face, the structural strength of the window beam is enhanced through the fins arranged on the window beam, and when the retainer is deformed under the action of external force, the fins can absorb part of deformation energy through elastic deformation of the fins. Once the external force disappears, the elastic recovery capability of the fins can promote the retainer to quickly recover to the original shape, so that the risks of accumulated stress and fatigue fracture caused by continuous deformation are reduced, and the retainer can effectively resist fatigue stress caused by continuous deformation in the long-term operation process. The service life of the retainer is prolonged, and faults and maintenance cost caused by fatigue fracture are reduced.

Description

Technical Field

[0001] The present application belongs to the field of harmonic drive flexible bearings, and in particular, relates to a harmonic reducer bearing retainer. Background Art

[0002] The harmonic reducer uses a wave generator to make the flexible wheel produce controllable elastic deformation, so that it meshes with the rigid wheel to transmit power and motion. This transmission method makes the harmonic reducer have the advantages of high transmission ratio, small size, low weight, large load-bearing capacity, smooth movement, no impact, and low noise. The wave generator of the harmonic reducer is mainly composed of a flexible bearing and an elliptical cam. The wave generator is usually installed at the input end of the reducer. The inner ring of the flexible bearing is fixed on the cam, and the outer ring is elastically deformed into an ellipse through a ball. When the wave generator is working, its elliptical cam rotates inside the flexible wheel, causing the flexible wheel and the bearing to produce controllable elastic deformation. This deformation causes the flexible wheel teeth to enter the meshing or meshing between the teeth of the rigid wheel during the deformation process, realizing the transmission of power and motion.

[0003] When the flexible bearing is working, its inner ring is installed on the elliptical rigid wheel, and the outer ring and the flexible wheel interact with each other through sliding friction or rolling friction. In order to achieve power transmission and motion conversion, both the outer ring and the inner ring of the bearing need to be able to undergo elastic deformation. Under this structure, the cages of the inner and outer rings need to have a certain deformation capacity to adapt to the deformation of the flexible bearing during operation. Due to the special working principle of the harmonic reducer, the flexible bearing cage will experience repeated deformation and stress changes during operation. This repeated deformation may not only cause fatigue and fracture of the cage material, but also affect its matching accuracy with the bearing ball. During use, it is often found that the early damage of the flexible bearing due to insufficient deformation capacity of the cage affects the performance and stability of the entire reducer. In order to ensure the normal operation of the harmonic reducer and extend the service life of the flexible bearing cage, it is necessary to carry out targeted improvement and optimization of the harmonic reducer bearing cage. Utility Model Content

[0004] The utility model provides a harmonic reducer bearing retainer, which is used to solve the problem that the flexible bearing retainer has insufficient deformation capacity and causes early fatigue damage under repeated deformation conditions, thereby affecting the performance and stability of the entire harmonic reducer.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A harmonic reducer bearing cage is arranged between the outer ring and the inner ring of a flexible bearing, and includes an annular cage end ring, and a plurality of window beams are arranged at equal intervals along the circumference of the cage end ring. One end of the window beam is connected to the cage end ring, and an open pocket for accommodating rolling bodies is formed between adjacent window beams. The window beam is provided with a raised fin facing the outer ring surface, which is arranged inside the bearing to position the cage and prevent it from moving. The fin has elastic deformation ability and can help the cage to restore its original shape when the cage is deformed, so as to reduce the risk of accumulated stress and fatigue fracture of the cage due to continuous deformation.

[0007] The harmonic reducer bearing cage of the present application has a window beam in the cage connected to an end ring at one end and a free end at the other end, so that the window beam has a certain degree of freedom when subjected to external force, and can undergo a certain elastic deformation. This deformation ability helps the cage to absorb and disperse the impact force through its own elastic deformation when subjected to impact or external force, thereby reducing the damage to the entire cage structure. The fins provided on the window beam not only enhance the structural strength of the window beam, but also the tilting design of the fins makes it closer to the outer ring of the bearing, and can better match the outer ring of the bearing to form a relatively fixed support structure. This support structure can effectively limit the range of movement of the cage inside the bearing to prevent it from moving, and its elastic deformation ability plays an important role in the deformation of the cage. When the cage is deformed by external force, the fins can absorb part of the deformation energy through their own elastic deformation. Once the external force disappears, the elastic recovery ability of the fins can prompt the cage to quickly restore its original shape, reducing the risk of accumulated stress and fatigue fracture caused by continuous deformation, so that it can effectively resist the fatigue stress caused by continuous deformation during long-term operation. Helps extend cage life and reduce failures and maintenance costs due to fatigue fractures.

[0008] In a preferred implementation, the fin is rectangular, the width of the fin is the same as the width of the outer wall of the window beam, and the thickness of the fin is 1 / 10-1 / 6 of the thickness of the window beam.

[0009] The design of the same width between the fin and the window beam outer wall ensures the close connection between the fin and the window beam, and enhances the stability and integrity of the entire structure. The thickness of the fin accounts for 1 / 10-1 / 6 of the thickness of the window beam. This proportional design ensures that the fin has sufficient elastic deformation capacity and avoids excessive waste of materials.

[0010] In a preferred implementation, the fin is connected below the center height of the window beam.

[0011] The fins are connected below the center height of the window beam so that when the window beam is subjected to external forces, especially bending forces, the fins can provide additional support and increase the bending stiffness of the window beam, making the entire cage structure more stable when subjected to bending deformation.

[0012] In a preferred implementation, at least one fin is provided on the outer wall surface of the window beam.

[0013] In a preferred implementation, there is an angle θ between the fin and the outer wall of the window beam, which satisfies 0°<θ≤15°.

[0014] When the angle θ is in the range of 0°<θ≤15°, the fin is guaranteed to have sufficient elastic deformation capacity, and the fin occupies less space in the cage, which helps to reduce the overall size of the cage and realize the compact design of the reducer. When the angle θ is greater than 15°, the connection between the fin and the window beam may become a stress concentration area, increasing the risk of local deformation and damage. At the same time, an excessively large angle θ means that the fin needs to occupy more space, which may cause the overall size of the cage to increase, which is not conducive to the compact design of the reducer.

[0015] In a preferred implementation, the free end of the fin extends to the plane where the end ring of the retaining frame is located.

[0016] The free end of the fin extends to the plane where the cage end ring is located, which not only enhances the continuity of the structure, but also optimizes the stress transfer path in the cage. When subjected to external force, the stress can be more smoothly transferred to the end ring through the fin and then dispersed to the entire cage structure, which helps to reduce stress concentration and reduce the risk of deformation and damage caused by local high stress.

[0017] In a preferred implementation, an oil-retaining gap is formed between the fin and the outer wall surface of the window beam.

[0018] The existence of the oil gap allows the lubricating oil to be better distributed between the fins and the outer wall of the window beam. The oil gap helps to improve the heat dissipation performance of the cage. The lubricating oil can more effectively take away the heat through the oil gap and reduce the temperature of the cage.

[0019] In a preferred implementation, the window beam and the fin are integrally formed by injection molding.

[0020] Through one-piece injection molding, an integral connection is formed between the window beam and the fin, ensuring the overall structural strength and stability of the retaining frame, enabling it to better resist deformation when subjected to external forces. At the same time, one-piece injection molding production can also improve production efficiency and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 A three-dimensional structural view of a schematic implementation of a harmonic reducer bearing cage of the present application is depicted;

[0023] Figure 2 A schematic front view of the structure of a bearing cage of a harmonic reducer of the present application is depicted;

[0024] Description of labels:

[0025] 1-cage end ring; 2-window beam; 3-opening pocket; 4-fin; 5-angle; 6-oil gap; 7-rolling element. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are considered to be illustrative and non-restrictive in nature.

[0027] In the description of the present invention, it is necessary to understand that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the present invention, unless otherwise clearly specified and limited, a first feature being "upper" or "lower" than a second feature may be the first and second features directly contacting, or the first and second features indirectly contacting through an intermediate medium.

[0028] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are connected to form a whole only through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] In the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] The utility model is described below in conjunction with the accompanying drawings.

[0031] The specific plans adopted are:

[0032] like Figure 1-2 As shown, the utility model provides a harmonic reducer bearing cage, which is arranged between the outer ring and the inner ring of the flexible bearing, and includes an annular cage end ring 1, and a plurality of window beams 2 are arranged at equal intervals along the circumference of the cage end ring 1, one end of the window beam 2 is connected to the cage end ring 1, and an open pocket 3 for accommodating a rolling body 7 is formed between adjacent window beams 2, and the window beam 2 is provided with a raised fin 4 facing the outer ring surface, which is arranged inside the bearing to position the cage to prevent it from moving, and the fin 4 has elastic deformation ability, which can help the cage to restore its original shape when the cage is deformed, so as to reduce the risk of accumulated stress and fatigue fracture of the cage due to continuous deformation.

[0033] The harmonic reducer bearing cage of the present application, one end of the window beam 2 in the cage is connected to the end ring, and the other end is a free end, so that the window beam 2 has a certain degree of freedom when subjected to external force, and can undergo a certain elastic deformation. This deformation ability helps the cage to absorb and disperse the impact force through its own elastic deformation when subjected to impact or external force, thereby reducing the damage to the entire cage structure, the fin 4 provided with the window beam 2 not only enhances the structural strength of the window beam 2, but also its elastic deformation ability plays an important role when the cage is deformed, when the cage is subjected to external force and deformed, the fin 4 can absorb part of the deformation energy through its own elastic deformation. Once the external force disappears, the elastic recovery ability of the fin 4 can prompt the cage to quickly restore its original shape, reducing the risk of accumulated stress and fatigue fracture caused by continuous deformation, so that it can effectively resist the fatigue stress caused by continuous deformation during long-term operation. It helps to extend the service life of the cage and reduce the failure and maintenance cost caused by fatigue fracture.

[0034] As a preferred embodiment of the present application, the fin 4 is rectangular, the width of the fin 4 is the same as the width of the outer wall of the window beam 2 , and the thickness of the fin 4 accounts for 1 / 10-1 / 6 of the thickness of the window beam 2 .

[0035] The design of the rectangular fin 4 is relatively simple, easy to manufacture and process, so as to reduce the manufacturing difficulty and cost and improve the production efficiency. The design of the fin 4 having the same width as the outer wall of the window beam 2 ensures the close connection between the fin 4 and the window beam 2, and enhances the stability and integrity of the whole structure. The thickness of the fin 4 accounts for 1 / 10-1 / 6 of the thickness of the window beam 2. Such a proportional design not only ensures that the fin 4 has sufficient elastic deformation capacity, but also avoids excessive waste of materials. Since the thickness of the fin 4 is moderate, it can undergo a certain degree of elastic deformation when subjected to external force, absorbing and dispersing the impact force. At the same time, the fin 4 can also quickly restore its original shape after deformation, which helps to reduce the risk of accumulated stress and fatigue fracture caused by continuous deformation of the retaining frame.

[0036] As a preferred embodiment of the present application, the fin 4 is connected below the center height of the window beam 2 .

[0037] Connecting the fin 4 below the center height of the window beam 2 actually utilizes the "lever principle" in mechanics. When the window beam 2 is subjected to external forces, especially bending forces, the fin 4 can provide additional support. Since the fin 4 is located below the center of the window beam 2, it can act as a moment point to increase the bending stiffness of the window beam 2, making the entire cage structure more stable when subjected to bending deformation. Connecting the fin 4 below the center height of the window beam 2, rather than directly connecting it to the top or side of the window beam 2, can make more efficient use of materials, so that the fin 4 will not add too much extra weight or volume while providing necessary support, which helps to keep the cage lightweight.

[0038] As a preferred embodiment of the present application, at least one fin 4 is provided on the outer wall surface of the window beam 2 .

[0039] As a preferred embodiment of the present application, there is an angle 5θ between the fin 4 and the outer wall surface of the window beam 2, satisfying 0°<θ≤15°.

[0040] The existence of angle 5 makes the space occupied by fin 4 in the cage smaller, which helps to reduce the overall size of the cage and realize the compact design of the reducer. For thin-walled bearings, a compact cage design means a smaller bearing gap, which helps to improve the supporting performance and stability of the bearing. Angle 5 that is too large may cause the structural stability of the cage to decrease. When subjected to external force, an excessively large angle 5 may cause the connection between the fin 4 and the window beam 2 to become an area of ​​stress concentration, increasing the risk of local deformation and damage. At the same time, an excessively large angle 5 means that the fin 4 needs to occupy more space, which may cause the overall size of the cage to increase, which is not conducive to the compact design of the reducer. At the same time, a larger angle 5 may also lead to a decrease in material utilization and increase manufacturing costs.

[0041] As a preferred embodiment of the present application, the free end of the fin 4 extends to the plane where the retainer end ring 1 is located.

[0042] The free end of the fin 4 extends to the plane where the retainer end ring 1 is located, which actually connects the window beam 2 and the retainer end ring 1 more closely, not only enhancing the continuity of the structure, but also optimizing the stress transfer path in the retainer. When subjected to external force, the stress can be more smoothly transferred to the end ring through the fin 4, and then dispersed to the entire retainer structure, which helps to reduce stress concentration and reduce the risk of deformation and damage caused by local high stress.

[0043] As a preferred embodiment of the present application, an oil gap 6 is formed between the fin 4 and the outer wall surface of the window beam 2 .

[0044] The existence of the oil gap 6 allows the lubricating oil to be better distributed between the fin 4 and the outer wall of the window beam 2. The oil gap 6 helps to improve the heat dissipation performance of the cage. The lubricating oil can more effectively take away the heat through the oil gap 6, reduce the temperature of the cage, and prevent performance degradation or damage caused by overheating. The lubricating effect of the lubricating oil makes the contact between the fin 4 and the outer wall of the window beam 2 smoother, reducing the vibration caused by friction. At the same time, the flow of the lubricating oil can also absorb some noise, making the speed reducer run more smoothly and quietly.

[0045] As a preferred embodiment of the present application, the window beam 2 and the fin 4 are integrally formed by injection molding.

[0046] Through one-piece injection molding, an integral connection is formed between the window beam 2 and the fin 4, ensuring the overall structural strength and stability of the retaining frame, so that it can better resist deformation when subjected to external forces. At the same time, one-piece injection molding production can also improve production efficiency and reduce production costs.

[0047] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0048] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A harmonic reducer bearing retainer, arranged between the outer ring and the inner ring of the flexible bearing, characterized in that: It includes an annular retainer end ring, and a plurality of window beams are arranged at equal intervals along the circumference of the retainer end ring. One end of the window beam is connected to the retainer end ring, and an open pocket for accommodating rolling bodies is formed between adjacent window beams. The window beam is provided with a raised fin facing the outer ring surface, which is arranged inside the bearing to position the retainer to prevent it from moving. The fin has elastic deformation ability and can help the retainer to restore its original shape when the retainer is deformed, so as to reduce the risk of accumulated stress and fatigue fracture of the retainer due to continuous deformation.

2. The harmonic reducer bearing holder according to claim 1, characterized in that: The fin is rectangular, the width of the fin is the same as the width of the outer wall of the window beam, and the thickness of the fin accounts for 1 / 10-1 / 6 of the thickness of the window beam.

3. The harmonic reducer bearing holder according to claim 1, characterized in that: The fins are connected below the center height of the window beam.

4. The harmonic reducer bearing holder according to claim 1, characterized in that: At least one fin is provided on the outer wall surface of the window beam.

5. The harmonic reducer bearing holder according to claim 1, characterized in that: There is an angle θ between the fin and the outer wall of the window beam, which satisfies 0°<θ≤15°.

6. The harmonic reducer bearing holder according to claim 1, characterized in that: The free end of the fin extends to the plane where the end ring of the retainer is located.

7. The harmonic reducer bearing holder according to claim 1, characterized in that: An oil-retaining gap is formed between the fin and the outer wall surface of the window beam.

8. The harmonic reducer bearing holder according to claim 1, characterized in that: The window beam and the fin are integrally formed by injection molding.

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