Rotary bearing assembly and its load device

Abstract

The present invention relates to a rotary bearing assembly and a loading device thereof. The outer ring of the rotary bearing assembly surrounds a central axis and has a running track with an inclined angle. The loading device includes a plurality of bearing rolling elements and a cage. The plurality of bearing rolling elements are configured to run on the running track. The cage includes a plurality of receiving seats configured to receive the plurality of bearing rolling elements. Each receiving seat includes a first covering portion, a second covering portion, and a receiving groove. The first covering portion has a concave arc surface with a first radius. The second covering portion has a concave arc surface with a second radius. The concave arc surface with the first radius and the concave arc surface with the second radius are non-concentric. The receiving groove is disposed between the first covering portion and the second covering portion. The bearing rolling elements are detachably received between the receiving groove, the first covering portion, and the second covering portion, and run on the running track.

Description

[Technical Field]

[0001] The present invention relates to a rotary bearing, and more particularly to a rotary bearing assembly and a load device thereof that have the advantages of high load capacity, high-speed specific reduction output, small volume, and easy assembly and maintenance of the load device. [Background technology]

[0002] Generally, a conventional rotary bearing comprises an inner ring, an outer ring, and a load device attached to the inner and outer rings. The rolling of the load device can realize applications in which the outer ring is fixed and the inner ring is rotated, or applications in which the outer ring is rotated and the inner ring is fixed. In general, rotary bearings are used in automation applications where rotational movement is performed under a load.

[0003] On the other hand, motors for automation applications are characterized by high speed and low torque, making it difficult to drive heavy loads. Therefore, when using a motor to move heavy objects, it is necessary to increase the torque by using a reducer to slow down the speed. Conventional rotary bearings are used in combination with motors and reducers, and when torque output is required, they are combined with gear sets. However, because the gear sets and corresponding rotary bearings are different sizes, they cannot share parts. Therefore, when rotary bearings are used in combination with gear sets, a large design space is required, making them unsuitable for compact designs.

[0004] To improve performance, reducers can adopt various designs. However, it is difficult to simultaneously achieve the goals of reducing overall volume, reducing the number of parts, and facilitating assembly under the same load conditions. For example, in conventional reducers, multiple rollers are arranged between the internal and external gear teeth. To facilitate axial fixing and assembly of the rollers, the bearing ring and internal gear ring are designed separately. However, designing the bearing ring and internal gear ring separately increases the number of parts, as well as the processing and assembly costs. Furthermore, fixing and assembling the bearing ring between the internal and external gear teeth also requires time and money. Increasing the number of parts in a design also increases the space required, making it difficult to miniaturize the rotary bearing assembly.

[0005] Therefore, in order to solve the shortcomings of the prior art, it is necessary to provide a rotary bearing assembly and a load device thereof that have the advantages of a high load capacity, a high-speed specific reduction output, a small volume, and easy assembly and maintenance of the load device. Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a rotary bearing assembly and a load device thereof which can be used to construct a bearing with a high load capacity, have a high-speed specific reduction output, have the advantage of being small in volume, and are easy to assemble and maintain the load device.

[0007] Another object of the present invention is to provide a rotary bearing assembly. When used in combination with a reducer, the rotary bearing assembly reduces the overall volume and number of parts while maintaining the same load, simplifies the assembly process, and overcomes the drawbacks of conventional cycloidal reducers, such as difficulty in miniaturization and the inability to share bearing components. The rotary bearing assembly includes an input shaft, an inner ring, an outer ring, and a load device. The input shaft rotates together with the rotating shaft of a motor and provides power input. The inner ring includes a gear set, which is fitted onto the input shaft via the gear set and driven by the input shaft. The outer ring is fitted onto the inner ring via the load device and engages with the gear set. The gear set is driven by the input shaft to move the inner ring, which in turn moves the outer ring, causing the inner and outer rings to rotate relative to each other, with one of the inner and outer rings providing power output, and there is a rotational speed difference between the power input and the power output. Meanwhile, the load device further includes a plurality of bearing rolling elements mounted via a cage, allowing the load device to be quickly and easily assembled between the inner and outer rings, and allowing the plurality of bearing rolling elements to stably run on the running track between the inner and outer rings. Without affecting the requirement for compactness of the rotary bearing assembly, the cage's first and second covering portions of the receiving seats can be designed according to the characteristics of the bearing rolling elements and the running track, allowing each bearing rolling element to be detachably mounted on the cage and run on the running track. The concave arc surfaces of the first and second covering portions are designed non-concentrically, and the cage is integrally molded. When each bearing rolling element is received in the corresponding receiving groove, it abuts against the first or second covering portion, facilitating assembly and disassembly. After the plurality of bearing rolling elements are received in the cage, the load device can be assembled on the running track between the inner and outer rings, simplifying the assembly and maintenance of the rotary bearing assembly. [Means for solving the problem]

[0008] To achieve the above object, the present invention provides a rotary bearing assembly comprising an outer ring and a loading device. The outer ring surrounds a central axis and comprises a running track having an inclined angle. The loading device comprises a plurality of bearing rolling elements and a cage. The plurality of bearing rolling elements are configured to run on the running track. The cage comprises a plurality of receiving seats configured to respectively receive the plurality of bearing rolling elements, each of the plurality of receiving seats comprising a first covering portion, a second covering portion, and a receiving groove. The first covering portion has a concave arc surface with a first radius. The second covering portion is spatially opposite the first covering portion and has a concave arc surface with a second radius. The concave arc surface with the first radius and the concave arc surface with the second radius are non-concentric. The receiving groove is provided between the first covering portion and the second covering portion, and each of the plurality of bearing rolling elements is detachably received between the receiving groove, the first covering portion, and the second covering portion and runs on the running track.

[0009] To achieve the above object, the present invention further provides a loading device configured to accommodate a plurality of bearing rolling elements that travel on a traveling track, and including a cage. The cage has a plurality of receiving seats configured to respectively accommodate the plurality of bearing rolling elements. Each of the plurality of receiving seats includes a first covering portion, a second covering portion, and an receiving groove. The first covering portion has a concave arc surface with a first radius. The second covering portion is spatially opposite the first covering portion and has a concave arc surface with a second radius. The concave arc surface with the first radius and the concave arc surface with the second radius are non-concentric. The receiving groove is provided between the first covering portion and the second covering portion, and each of the plurality of bearing rolling elements is detachably received between the receiving groove, the first covering portion, and the second covering portion, and travels on the traveling track. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic structural diagram of a rotary bearing assembly according to a preferred embodiment of the present invention; [Figure 2] 1 is a three-dimensional structural view of a rotary bearing assembly according to a preferred embodiment of the present invention; [Figure 3] 1 is a vertical cross-sectional view of a rotary bearing assembly according to a preferred embodiment of the present invention; [Figure 4] 1 is an exploded structural view of an outer ring portion in a rotary bearing assembly according to a preferred embodiment of the present invention. [Figure 5] 1 is a vertical cross-sectional view of an outer ring portion of a rotary bearing assembly according to a preferred embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged view of area P1 in FIG. 5. [Figure 7] 1 is a schematic structural diagram of a load device in a rotary bearing assembly according to a preferred embodiment of the present invention; [Figure 8] 1 is a structural exploded view of a load device in a rotary bearing assembly according to a preferred embodiment of the present invention; [Figure 9] FIG. 8 is an enlarged view of the unit structure of the load device in area P2 of FIG. 7. [Figure 10] FIG. 2 is a vertical cross-sectional view of the unit structure of the load device. [Figure 11] FIG. 10 is a diagram showing the relationship between the unit structure of the load device and the dimensions of the bearing rolling elements. [Figure 12] FIG. 10 is another diagram showing the dimensional relationship between the unit structure of the load device and the rolling elements of the bearing. DETAILED DESCRIPTION OF THE INVENTION

[0011] Several exemplary embodiments illustrating the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention may be modified in various ways in different embodiments without departing from the scope of the present invention, and that the description and drawings are intended to be illustrative in nature and not limiting. For example, in the following description of the present disclosure, when a first feature is described as being located on or above a second feature, this includes embodiments in which the located first feature is in direct contact with the second feature, and also includes embodiments in which an additional feature is located between the first feature and the second feature, thereby preventing the first feature from being in direct contact with the second feature. Furthermore, duplicate reference numerals and / or symbols may be used in different embodiments of the present disclosure. This duplication is for the purposes of brevity and clarity and is not intended to limit the relationship between each embodiment and / or the external structure. Spatial terms, such as "top," "bottom," "upper," "lower," and similar terms, may be used to simply describe the relationship of a component or feature to another component or feature in the drawings. In addition to the orientation shown in the drawings, spatial terms are used to include different orientations of the device during use or operation. The device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatial terms used should be interpreted accordingly. Furthermore, when a component is referred to as being "connected" or "coupled" to another component, it may be directly connected or coupled to the other component, or intervening components may be present. While the broad range of numerical ranges and parameters in this disclosure are approximations, the specific examples describe numerical values ​​as precisely as possible. Furthermore, while terms such as "first," "second," and "third" may be used to describe different components in the claims, it should be understood that these components should not be limited by these terms and that the components described in the embodiments may be represented by different component symbols. These terms are used to distinguish between different components.For example, a first component could be termed a second component, and similarly, a second component could be termed a first component without departing from the scope of the embodiments.

[0012] 1 to 12, which disclose a rotary bearing assembly according to a preferred embodiment of the present invention. The rotary bearing assembly 1 of the present invention can be used in, but is not limited to, various motor devices, machine tools, mechanical arms, automobiles, motorcycles, or other power machines to provide power output with an appropriate rotational speed differential.

[0013] 1 to 3. In this embodiment, the rotary bearing assembly 1 includes an input shaft 10, an inner ring portion 20, an outer ring portion 30, and a load device 40. The input shaft 10 is located approximately at the center of the rotary bearing assembly 1 and extends along the central axis J of the rotary bearing assembly 1. The input shaft 10 rotates in accordance with a rotation axis (not shown) of a motor to provide power input. The inner ring portion 20 includes a gear set 21, is sleeved on the input shaft 10 via the gear set 21, and is driven by the input shaft 10. The outer ring portion 30 is sleeved on the inner ring portion 20 via the load device 40 and meshes with the gear set 21. The gear set 21 is driven by the input shaft 10 to move the inner ring portion 20, which in turn moves the outer ring portion 30, and the inner ring portion 20 and the outer ring portion 30 rotate relative to each other. In other words, the outer ring portion 30 can also be rotated by the input shaft 10 via the gear set 21. In this embodiment, one of the inner ring portion 20 and the outer ring portion 30 provides the power output, and there is a rotational speed difference between the power input and the power output.

[0014] In one embodiment, the outer ring portion 30 is an output end, and the inner ring portion 20 is a fixed end, and includes at least one output gear 23, 23' and a transmission shaft 22. In this embodiment, the output gear 23 is fixedly installed, for example, on a motor housing, and the output gear 23' is fixed to the ground. The output gears 23, 23' are each connected to a gear set 21 via the transmission shaft 22. When driven by the input shaft 10, the gear set 21 moves the outer ring portion 30 to provide power output.

[0015] In another embodiment, the outer ring portion 30 is a fixed end and the inner ring portion 20 is an output end, and includes at least one output gear 23, 23′ and a transmission shaft 22, and the at least one output gear 23, 23′ is connected to the gear set 21 via the transmission shaft 22. When the gear set 21 is driven by the input shaft 10, it moves the at least one output gear 23, 23′ via the transmission shaft 22 to provide a power output.

[0016] Also refer to Figure 4. In this embodiment, the outer ring portion 30 may be, for example, a needle shell, and the inner ring surface 301 corresponds to the gear set 21 of the inner ring portion 20. The outer ring portion 30 is fitted onto the output gears 23, 23' of the inner ring portion 20 via a load device 40, thereby realizing the functions of the output end and the fixed end. The outer ring portion 30 and the output gears 23, 23' of the inner ring portion 20 form a pair of running tracks 31 surrounding the central axis J of the rotary bearing assembly 1, and a plurality of bearing rolling elements 42 of the load device 40 roll on the pair of running tracks 31. In this embodiment, the running track 31 is spatially opposed to at least one output gear 23, 23' of the outer ring portion 30 and the inner ring portion 20 and has a parallelogram shape in radial cross section, thereby allowing multiple bearing rolling elements 42 of the load device 40 to roll between the outer ring portion 30 and the at least one output gear 23, 23' of the inner ring portion 20. Of course, the present invention is not limited to this. In this embodiment, the running tracks 31 on the outer ring portion 30 are located on both opposite outer sides (up and down) of the inner ring surface 301 and have an inclination angle of, for example, 45° with respect to the central axis J (as shown in FIG. 12 ). The multiple bearing rolling elements 42 are cylindrical and rotate and run along the running track 31. The inclination angle θ of the running track 31 with respect to the central axis J is the inclination angle θ of each bearing rolling element 42 with respect to the central axis J. In this embodiment, the load device 40 further includes a retainer 41, and each bearing rolling element 42 is removably arranged in the retainer 41, thereby maintaining the multiple bearing rolling elements 42 to run on the running track 31 on the outer ring portion 30.

[0017] In this embodiment, the outer ring portion 30 further includes a pair of roller retaining rings 33 respectively disposed between the running track 31 and the inner ring surface 301. The pair of roller retaining rings 33 are respectively installed on opposite upper and lower sides of the inner ring surface 301 via the accommodation grooves 32. The running track 31 is installed adjacent to the roller retaining rings 33. After being placed in the accommodation grooves 32, the roller retaining rings 33 can restrain the rollers (not shown) on the inner ring surface 301.

[0018] See FIGS. 6 to 9. In this embodiment, the cage 41 of the load device 40 is integrally molded, for example, into a ring-like structure, and includes a plurality of receiving seats 410 configured to receive a plurality of bearing rolling elements 42, respectively. The unit structure of each receiving seat 410 is shown in FIG. 9. In this embodiment, there is a slope length W1 between the inner diameter and outer diameter of the raceway ring of the running track 31, the retaining ring 33 has a thickness W2, and the receiving groove 32 has an installation depth W3. Preferably, the ratio of the slope length W1 to the thickness W2 is in the range of 9 / 10 to 700 / 27, and the ratio of the slope length W1 to the installation depth W3 is in the range of 1 / 2 to 620 / 27. This optimizes the running of the bearing rolling elements 42 on the running track.

[0019] 9 to 12. Meanwhile, in this embodiment, the plurality of bearing rolling elements 42 are cylindrical with a diameter length ΦE and a cylindrical height L. Each of the plurality of receiving seats 410 includes a receiving groove 413, a first covering portion 411, and a second covering portion 412. The first covering portion 411 and the second covering portion 412 are spatially opposed to each other and are located at opposite ends of the receiving groove 413. Each of the plurality of bearing rolling elements 42 is detachably received between the receiving groove 413, the first covering portion 411, and the second covering portion 412, and travels on the travel track 31 (as shown in FIG. 5). In this embodiment, the first covering portion 411 and the second covering portion 412 of the receiving seat 410 can be designed according to the characteristics of the bearing rolling elements 42 and the travel track 31 in the cage 41, without affecting the requirement for miniaturization of the rotary bearing assembly 1 (as shown in FIG. 2). The first coating portion 411 has a first coating thickness T1, and the second coating portion 412 has a second coating thickness T2. Preferably, the ratio of the first coating thickness T1 or the second coating thickness T2 to the diameter length ΦE of the plurality of bearing rolling elements 42 is in the range of 0.2 to 0.25.

[0020] In this embodiment, the first covering portion 411 has a concave arc surface with a first radius R1, and the second covering portion 412 has a concave arc surface with a second radius R2. As shown in FIG. 12 (a cross section perpendicular to the rolling center C of the bearing rolling element 42), the concave arc surface with the first radius R1 and the concave arc surface with the second radius R2 are not concentric. In this embodiment, the concave arc surface with the first radius R1 has a first circular center C1, and the concave arc surface with the second radius R2 has a second circular center C2. Each of the multiple bearing rolling elements 42 is cylindrical, and the rolling center C of the cylinder passes through the cylinder center. When each bearing rolling element 42 is received in the corresponding receiving groove 413, the cylindrical center of the cylinder is concentric with the first circular center C1 but not with the second circular center C2. In another embodiment, when each bearing rolling element 42 is received in the corresponding receiving groove 413, the cylinder center is concentric with the second circular center C2 but not with the first circular center C1. Thus, in this design, the bearing rolling element 42 is covered within the receiving seat 410. During actual operation, the bearing rolling element 42 may abut against the second covering portion 412 or the first covering portion 411. Of course, the present invention is not limited to this.

[0021] In this embodiment, the ratio of the first radius R1 or the second radius R2 to the diameter length ΦE of the plurality of bearing rolling elements 42 is in the range of 0.5 to 0.55. In this embodiment, the bearing rolling elements 42 are housed in housing grooves 413, and the housing grooves 413 have an inclination angle θ with respect to the axial direction of the central axis J of the input shaft 10. Preferably, the ratio of the cylinder height L to sin (the inclination angle θ) is equal to or less than the height H of the cage 41.

[0022] In this embodiment, the end face of each receiving seat 410 adjacent to the first covering portion 411 has a first radial length L1, and the end face of each receiving seat 410 adjacent to the second covering portion 412 has a second radial length L2, and the ratio of the diameter length ΦE of the plurality of bearing rolling elements 42 to the first radial length L1 or the second radial length L2 is in the range of 2 to 2.5. The receiving groove 413 has an accommodation width W and an accommodation length L3. Preferably, the accommodation width W is greater than the diameter length ΦE of the plurality of bearing rolling elements 42, and the accommodation length L3 is greater than the cylindrical height L. This allows the plurality of bearing rolling elements 42 to be easily and firmly attached to the cage 41, simplifies the installation of the load device 40 (as shown in FIG. 3), and maintains optimal movement of the plurality of bearing rolling elements 42 along the traveling track. In other words, without affecting the requirement for miniaturization of the rotary bearing assembly 1 (as shown in FIG. 3 ), the first covering portion 411 and the second covering portion 412 of the receiving seat 410 of the cage 41 can be designed according to the characteristics of the bearing rolling elements 42 and the running track 31, so that each bearing rolling element 42 can be detachably installed in the cage 41 to allow the running track 31 to move. Each bearing rolling element 42 can be easily attached to and detached from the receiving seat 410. When assembling the rotary bearing assembly 1, after the multiple bearing rolling elements 42 are received in the cage 41, the load device 40 can be installed in the running track 31 between the inner ring portion 20 and the outer ring portion 30, thereby simplifying the assembly and maintenance of the rotary bearing assembly 1. Of course, the present invention is not limited to this, and further description will be omitted.

[0023] As described above, the present invention provides a rotary bearing assembly and a load device thereof, which can be used to construct a bearing with a high load capacity, have the advantages of high-speed specific reduction output, small volume, and easy assembly and maintenance of the load device. When the rotary bearing assembly is used in combination with a reducer, the overall volume and number of parts can be reduced for the same load, the assembly process can be simplified, and the drawbacks of conventional cycloidal reducers, such as difficulty in miniaturization and the inability to share bearing parts, can be resolved. The rotary bearing assembly includes an input shaft, an inner ring, an outer ring, and a load device. The input shaft rotates together with the rotating shaft of a motor and inputs power. The inner ring includes a gear set, which is fitted onto the input shaft via the gear set and driven by the input shaft. The outer ring is fitted onto the inner ring via the load device and engages with the gear set, and the gear set is driven by the input shaft to move the inner ring. The gear set drives the outer ring, causing the inner and outer rings to rotate relative to each other, with one of the inner and outer rings providing power output, and there is a rotational speed difference between the power input and the power output. Meanwhile, the load device further includes a plurality of bearing rolling elements via a cage, allowing the load device to be quickly and easily assembled between the inner and outer rings, and allowing the plurality of bearing rolling elements to stably run on the running track between the inner and outer rings. Without affecting the compactness of the rotary bearing assembly, the cage's first and second covering portions of the receiving seats are designed according to the characteristics of the bearing rolling elements and the running track, allowing each bearing rolling element to be detachably installed in the cage and run on the running track. The concave arc surfaces of the first and second covering portions are designed non-concentrically, and the cage is integrally molded. When each bearing rolling element is received in the corresponding receiving groove, it abuts against the first or second covering portion, facilitating assembly and disassembly. After a plurality of bearing rolling elements are accommodated in the cage, a loading device is attached to the running track between the inner ring and the outer ring, thereby simplifying the assembly and maintenance of the rotary bearing assembly.

[0024] The present invention may be modified or changed in various ways by those skilled in the art, and such modifications or changes do not depart from what is protected by the appended claims. [Explanation of symbols]

[0025] 1: Rotating bearing assembly 10: Input shaft 20: Inner ring 21: Gear set 22: Transmission shaft 23, 23': Output gear 30: Outer ring 301: Inner surface 31: Truck 32: Storage groove 33: Roller retaining ring 40:Load equipment 41:Retainer 410: Containment seat 411: First coating part 412: Second coating section 42: Bearing rolling element C: Rolling center C1: Center of the first circle C2: Second circle center H: Height J: Central axis L: Cylinder height L1: First radial length L2: Second radial length L3: Storage length R1: First radius R2: 2nd radius T1: First coating thickness T2: Second coating thickness W: Storage width W1: Slope length W2: Thickness W3: Mounting depth X, Y, Z: Axes ΦE: diameter length θ: Tilt angle

Claims

1. A rotary bearing assembly comprising an outer ring and a load device, The outer ring portion includes a running track surrounding a central axis and having an inclination angle; The loading device includes a plurality of bearing rolling elements and a cage, The plurality of bearing rolling elements are configured to travel on the travel track; the cage includes a plurality of receiving seats configured to receive the plurality of bearing rolling elements, respectively; Each of the plurality of accommodating seats includes a first covering portion, a second covering portion, and an accommodating groove, the first covering portion has a concave arc surface with a first radius, the second covering portion is spatially opposed to the first covering portion and has a concave arc surface with a second radius, the concave arc surface with the first radius and the concave arc surface with the second radius being non-concentric circles; the accommodation groove is provided between the first covering portion and the second covering portion, and each of the plurality of bearing rolling elements is detachably accommodated between the accommodation groove, the first covering portion, and the second covering portion, and travels on the travel track. Rotary bearing assembly.

2. The outer ring portion is fitted onto the inner ring portion via the load device, and the inner ring portion includes a gear set fitted onto an input shaft, the gear set is driven by the input shaft to move the inner ring portion, the gear set moves the outer ring portion, and the inner ring portion and the outer ring portion rotate relatively, 2. The rotary bearing assembly of claim 1, wherein one of said inner ring and said outer ring provides a power output, and there is a rotational speed difference between the power input and said power output.

3. The outer ring portion is an output end, the inner ring portion is a fixed end, and the gear set includes at least one output gear and a transmission shaft, and the at least one output gear is fixedly installed and connected to the gear set via the transmission shaft; 3. The rotary bearing assembly of claim 2, wherein said gear set, when driven by said input shaft, moves said outer ring portion to provide said power output.

4. the outer ring portion is a fixed end, the inner ring portion is an output end, and the gear set includes at least one output gear and a transmission shaft, and the at least one output gear is connected to the gear set via the transmission shaft; 3. The rotary bearing assembly of claim 2, wherein said gear set, when driven by said input shaft, moves said at least one output gear via said transmission shaft to provide said power output.

5. 2. The rotary bearing assembly according to claim 1, wherein the outer ring portion comprises a pair of running tracks and a pair of roller retaining rings, the pair of running tracks being located on opposite outer sides of the outer ring portion, and the pair of roller retaining rings being respectively installed on opposite sides via accommodation grooves and respectively installed adjacent to the pair of running tracks.

6. The pair of running tracks have a slope length between the inner diameter and the outer diameter of the raceway rings, the pair of roller retaining rings have a thickness, and the receiving groove has an installation depth; 6. The rotary bearing assembly according to claim 5, wherein the ratio of said inclination length to said thickness is in the range of 9 / 10 to 700 / 27, and the ratio of said inclination length to said mounting depth is in the range of 1 / 2 to 620 / 27.

7. 2. The rotary bearing assembly according to claim 1, wherein each of the plurality of bearing rolling elements is cylindrical, is housed in the housing groove, and abuts against the first covering portion or the second covering portion.

8. A load device configured to accommodate a plurality of bearing rolling elements traveling on a traveling track, comprising: The load device includes a retainer, the cage includes a plurality of receiving seats configured to receive the plurality of bearing rolling elements, respectively; Each of the plurality of accommodating seats includes a first covering portion, a second covering portion, and an accommodating groove, the first covering portion has a concave arc surface with a first radius, the second covering portion is spatially opposed to the first covering portion and has a concave arc surface with a second radius, the concave arc surface with the first radius and the concave arc surface with the second radius being non-concentric circles; the accommodation groove is provided between the first covering portion and the second covering portion, and each of the plurality of bearing rolling elements is detachably accommodated between the accommodation groove, the first covering portion, and the second covering portion, and travels on the travel track. load equipment.

9. Each of the plurality of bearing rolling elements is cylindrical having a diameter length and a cylindrical height, and the first covering portion and the second covering portion are located at opposite ends of the accommodation groove, respectively; the first coating portion has a coating thickness, and the second coating portion has a second coating thickness; 9. The load device according to claim 8, wherein a ratio of the coating thickness or the second coating thickness to the diameter lengths of the plurality of bearing rolling elements is in the range of 0.2 to 0.

25.

10. 10. The load device according to claim 9, wherein a ratio of the first radius or the second radius to the diameter lengths of the plurality of bearing rolling elements is in a range of 0.5 to 0.

55.

11. an end surface of the accommodating seat adjacent to the first covering portion has a first radial length, and an end surface of the accommodating seat adjacent to the second covering portion has a second radial length; 10. The load device according to claim 9, wherein a ratio of the diameter length of the plurality of bearing rolling elements to the first radial length or the second radial length is in a range of 2 to 2.

5.

12. The load device according to claim 9 , wherein the accommodation groove has an accommodation width and an accommodation length, the accommodation width being greater than the diameter length of the plurality of bearing rolling elements, and the accommodation length being greater than the cylinder height.

13. The load device according to claim 9, wherein the receiving groove has an inclination angle with respect to the central axis of the traveling track, and a ratio of the cylinder height to sin (the inclination angle) is equal to or less than a height of the cage.

14. 9. The load device according to claim 8, wherein each of the plurality of bearing rolling elements is cylindrical having a cylindrical center, the concave arc surface of the first radius has a first circular center, and the concave arc surface of the second radius has a second circular center, and when each of the plurality of bearing rolling elements is accommodated in the corresponding accommodation groove, it abuts against the first covering portion or the second covering portion, and one of the first circular center and the second circular center is concentric with the cylindrical center.

Images