Rotary bearing assembly

Abstract

To provide a rotary bearing assembly having high load capacity and high-speed ratio / deceleration output and also having an advantage of a small cubic volume.SOLUTION: The invention relates to a rotary bearing assembly including an input shaft, an inner-ring member, an outer-ring member, and a load member. The input shaft is coupled to a rotating shaft of a motor and rotates to provide power input. The inner-ring member includes a gear set and is sleeved on the input shaft through the gear set and driven by the input shaft. The outer-ring member is sleeved on the inner-ring member through the load member and engaged with the gear set. When the gear set is driven by the input shaft to drive the inner-ring member, the gear set drives the outer-ring member and the inner-ring member and the outer-ring member rotate relative to each other. One of the inner-ring member and the outer-ring member provides power output, and a rotational speed difference exists between the power input and the power output.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotary bearing assembly, and more particularly to a rotary bearing assembly having a high load capacity, a high speed ratio and a decelerated output, and in addition, having the advantage of a small volume.

Background Art

[0002] Generally, a conventional rotary bearing includes an inner bearing ring, an outer bearing ring, and a load member installed on the inner and outer bearing rings. By the rolling of the load member, the fixing of the outer bearing ring and the rotation of the inner bearing ring, or the rotation of the outer bearing ring and the fixing of the inner bearing ring can be realized. In general automation applications, when carrying a load and performing a rotational movement, a rotary bearing is used.

[0003] On the other hand, a motor in an automation application has the characteristics of high rotation and low torque, and it is difficult to drive a large load. Therefore, when pushing a heavy object by a motor, it is necessary to decelerate with a speed reducer to increase the torque. Therefore, a conventional rotary bearing is used in combination with a motor and a speed reducer, and when torque output is required, it is further used in combination with a gear set. However, since the dimensions of the gear set and the rotary bearing combined with it are different, materials cannot be shared. Therefore, when using a rotary bearing and a gear set in combination, the design space becomes large, which is disadvantageous for miniaturization.

[0004] In addition, a speed reducer can adopt various designs to improve performance. However, under the same load conditions, it is not easy to simultaneously achieve a reduction in the overall volume, a reduction in the number of parts, and ease of assembly. For example, in a conventional speed reducer, a plurality of rollers are arranged between the internal teeth and the external teeth, and the bearing ring and the internal tooth ring are designed separately, which facilitates the axial fixing and assembly of the rollers. However, since the bearing ring and the internal tooth ring are designed separately, the number of parts increases, and the processing cost and the assembly cost also increase. In addition, when the number of design parts increases, the space requirement increases, making miniaturization difficult.

[0005] Therefore, in addition to having a high load capacity, a high speed ratio, and a reduced speed output, it is necessary to provide a rotary bearing assembly that has the advantage of a small volume and solves the drawbacks of the prior art.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The object of the present invention is to provide a rotary bearing assembly that has the advantage of a small volume while having a bearing with a high load capacity and constructing a high speed ratio and a reduced speed output.

[0007] The object of the present invention is to provide a rotary bearing assembly. By combining and using the rotary bearing assembly with a speed reducer, the overall volume and the number of parts can be reduced under the same load, the assembly process can be facilitated, the drawbacks of the conventional cycloid speed reducer, such as being disadvantageous for miniaturization and not being able to share bearing materials, can be solved. On the other hand, the concentric end and the eccentric end of the transmission shaft used in the rotary bearing assembly have the same diameter, and miniaturization can be achieved without increasing the diameter of the eccentric end. Also, since the concentric end and the eccentric end of the transmission shaft have the same diameter, bearings externally fitted to the concentric end and the eccentric end of the transmission shaft can use the same specifications, and the material cost can be reduced. Furthermore, since the concentric end and the eccentric end of the transmission shaft of the present invention are integrally formed, the installation accuracy and alignment accuracy of the transmission shaft in the rotary bearing assembly can be further improved.

Means for Solving the Problems

[0008] To achieve the above object, the present invention provides a rotary bearing assembly including an input shaft, an inner ring member, an outer ring member, and a load member. The input shaft is coupled to the rotating shaft of a motor and rotates to provide power input. The inner ring member includes a gear set, is externally fitted to the input shaft via the gear set, and is driven by the input shaft. The outer ring member is externally fitted to the inner ring member via the load member and meshes with the gear set. When the gear set is driven by the input shaft to move the inner ring member, the gear set moves the outer ring member, and the inner ring member and the outer ring member rotate relative to each other. One of the inner ring member and the outer ring member provides power output, and there is a rotational speed difference between the power input and the power output.

Brief Description of the Drawings

[0009]

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Embodiments for Carrying Out the Invention

[0010] Some exemplary embodiments showing the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different aspects, all without departing from the scope of the present invention, and the description and drawings are essentially used for illustration purposes and are not intended to limit the present invention. For example, in the following content of the present disclosure, when it is described that a first feature is installed above or over a second feature, embodiments are included where the installed first feature is in direct contact with the second feature, and by installing additional features between the first feature and the second feature, embodiments are also included where the first feature is not in direct contact with the second feature. Further, in different embodiments of the present disclosure, duplicate reference numerals and / or symbols can be used. These duplicates are used for the purpose of simplification and clarification and are not used to limit the relationship between each embodiment and / or the appearance structure. Also, for the purpose of simply describing the relationship between a component or feature element in the drawings and other component(s) or feature element(s), spatial-related terms such as, for example, "top", "bottom", "above", "below", and similar terms can be used. In addition to the orientation shown in the drawings, spatial-related terms are used to include different orientations of the device during use or operation. The device may be positioned separately (e.g., rotated 90 degrees or in other orientations), and the description of the spatial-related terms used accordingly should be interpreted. Further, when one component is said to "connect" or "couple" to another component, it can be directly connected or coupled to the other component, or intervening components may exist. The numerical ranges and parameters in the broad scope of the present disclosure are approximate values, but the numerical values are described as accurately as possible in specific examples. Further, terms such as "first", "second", "third", etc. can be used to describe different components in the claims, but these components should not be limited by these terms, and it should be understood that these components described in the embodiments are indicated by different component symbols. These terms are for distinguishing different components.For example, the first component can be referred to as the second component, and similarly, the second component can also be referred to as the first component, without departing from the scope of the embodiments.

[0011] Referring to FIGS. 1 and 2, a rotary bearing assembly according to a first preferred embodiment of the present invention is shown. The rotary bearing assembly 1 of the present invention can be applied to various motor devices, machine tools, robotic arms, automobiles, motorcycles or other power machines in order to provide a power output with an appropriate rotational speed difference, but is not limited thereto.

[0012] In this embodiment, the rotary bearing assembly 1 includes an input shaft 10, an inner ring member 20, an outer ring member 30, and a load member 40. The input shaft 10 is located at the substantial center of the rotary bearing assembly 1, is coupled to the rotary shaft 92 of the motor 90 and rotates to provide a power input. The inner ring member 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 member 30 is sleeved on the inner ring member 20 via the load member 40 and meshes with the gear set 21. When the gear set 21 is driven by the input shaft 10 to move the inner ring member 20, the gear set 21 moves the outer ring member 30, and the inner ring member 20 and the outer ring member 30 rotate relative to each other. In other words, the outer ring member 30 can also be rotated by the input shaft 10 via the gear set 21. In this embodiment, one of the inner ring member 20 and the outer ring member 30 provides a power output, and there is a rotational speed difference between the power input and the power output.

[0013] In this embodiment, the outer ring member 30 is an output end, the inner ring member 20 is a fixed end, and includes at least one output gear disk 23, 23' and a transmission shaft 22. In this embodiment, the output gear disk 23 can be fixedly installed on, for example, the motor housing 91, and the output gear disk 23' is fixed on the plane 8. The output gear disks 23, 23' are respectively connected to the gear set 21 via the transmission shaft 22. When the gear set 21 is driven by the input shaft 10, the gear set 21 moves the outer ring member 30 to provide a power output.

[0014] In other embodiments, refer to FIG. 3 in combination. The outer ring member 30 is a fixed end, the inner ring member 20 is an output end, and it includes at least one output gear disk 23, 23' and a transmission shaft 22. At least one output gear disk 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, the gear set 21 moves at least one output gear disk 23, 23' via the transmission shaft 22 to provide power output.

[0015] In this embodiment, the outer ring member 30 includes a needle cage ring 300 and a plurality of rollers 301, and the plurality of rollers 301 are installed on the needle cage ring 300. The load member 40 includes a plurality of bearing rolling elements 42 and a pair of raceway rings 43, 44. The pair of raceway rings 43, 44 are installed on opposite sides of the needle cage ring 300, and respectively provide a running track 35 for the plurality of bearing rolling elements 42 to run. In this embodiment, the running tracks 35 are installed in pairs, but the present invention is not limited thereto.

[0016] In this embodiment, the gear set 21 includes a first cycloid gear disk 21a and a second cycloid gear disk 21b. The first cycloid gear disk 21a is externally fitted on the input shaft 10 and is rotationally driven by the input shaft 10, and includes a first tooth portion 210 that contacts a corresponding portion of at least one roller 301. The second cycloid gear disk 21b is externally fitted on the input shaft 10 and is rotationally driven by the input shaft 10, and includes a second tooth portion 210' that contacts a corresponding portion of at least one roller 301. In this embodiment, the first cycloid gear disk 21a and the second cycloid gear disk 21b are respectively located on opposite sides of the needle cage ring 300. In this embodiment, the pair of raceway rings 43, 44 have a raceway ring inner diameter d4, and the first cycloid gear disk 21a and the second cycloid gear disk 21b respectively have a cycloid gear disk outer diameter d5, and the raceway ring inner diameter d4 is larger than the cycloid gear disk outer diameter d5.

[0017] In this embodiment, at least one of the output gear disks 23 and 23' includes a first output gear disk 23 and a second output gear disk 23'. The first output gear disk 23 and the second output gear disk 23' are located on opposite outer sides of the needle housing ring 300. Thus, the first cycloid gear disk 21a and the second cycloid gear disk 21b are interposed between the first output gear disk 23 and the second output gear disk 23'. At least one of the first output gear disk 23 and the second output gear disk 23' can function as the power output of the rotary bearing assembly 1. Of course, when the needle housing ring 300 is the output end, at least one of the first output gear disk 23 and the second output gear disk 23' may be the fixed end. The present invention is not limited thereto.

[0018] Referring to FIGS. 3, 4, and 5, in this embodiment, the number of transmission shafts 22 may be one or more. In this embodiment, five transmission shafts 22 are illustrated. Each transmission shaft 22 is a crankshaft and is connected to the first cycloid gear disk 21a, the second cycloid gear disk 21b, the first output gear disk 23, and the second output gear disk 23'. It includes a first concentric end 221, a first eccentric end 222, a second eccentric end 223, and a second concentric end 224 that are integrally formed and sequentially arranged. The first concentric end 221 is connected to the first output gear disk 23, the first eccentric end 222 is connected to the first cycloid gear disk 21a, the second eccentric end 223 is connected to the second cycloid gear disk 21b, and the second concentric end 224 is connected to the second output gear disk 23'. Also, there is an eccentricity between any two adjacent ones of the first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224. Further, the diameter ΦA of the first concentric end 221, the diameter ΦC of the first eccentric end 222, the diameter ΦD of the second eccentric end 223, and the diameter ΦB of the second concentric end 224 are all the same, that is, equal to the diameter d1 of the transmission shaft of the transmission shaft 22.

[0019] In this embodiment, in the rotary bearing assembly 1, there is no need to limit the diameter of the eccentric end of the transmission shaft 22 to be larger than that of the concentric end. The first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224 of the transmission shaft 22 have the same diameter (ΦA = ΦC = ΦD = ΦB), that is, the transmission shaft has a diameter d1. Thereby, the rotary bearing assembly 1 can be miniaturized without increasing the diameters of the first eccentric end 222 and the second eccentric end 223. Further, since the first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224 of the transmission shaft 22 have the same diameter, when it is necessary to externally fit the corresponding bearings to the first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224 of the transmission shaft 22 respectively, these bearings can use the same specifications, and the material cost can be reduced. Furthermore, since the first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224 of the transmission shaft 22 of the present invention are integrally formed, the installation accuracy and alignment accuracy of the transmission shaft 22 in the rotary bearing assembly 1 can be further improved.

[0020] In this embodiment, as shown in FIG. 5, the amount of eccentricity between the first concentric end 221 and the first eccentric end 222 is defined as the first eccentricity E1, the amount of eccentricity between the second concentric end 224 and the second eccentric end 223 is defined as the second eccentricity E2, and the amount of eccentricity between the first eccentric end 222 and the second eccentric end 223 is defined as the third eccentricity E3. Then, the first eccentricity E1 is equal to the second eccentricity E2, and the third eccentricity E3 is equal to twice the first eccentricity E1. Thereby, it becomes easy to externally fit the corresponding bearings to the first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224 of the transmission shaft 22 respectively. Further, in this embodiment, the first concentric end 221 and the second concentric end 224 are coaxial with the transmission shaft 22, the first eccentric end 222 and the second eccentric end 223 are installed eccentrically with respect to the transmission shaft 22, and the eccentric directions of the first eccentric end 222 and the second eccentric end 223 are opposite.

[0021] Refer to FIG. 6 in combination. In some embodiments, the first cycloid gear disk 21a further includes at least one externally fitted hole 211, and each externally fitted hole 211 is installed at a corresponding position of the corresponding transmission shaft 22 such that the first eccentric end 222 of the transmission shaft 22 penetrates through and the first eccentric end 221 can be connected to the first cycloid gear disk 21a. The first output gear disk 23 further includes at least one externally fitted hole 230, and each externally fitted hole 230 is installed at a corresponding position of the corresponding transmission shaft 22 such that the first concentric end 221 of the transmission shaft 22 penetrates through and the first concentric end 221 can be connected to the first output gear disk 23. The second cycloid gear disk 21b further includes at least one externally fitted hole 211', and each externally fitted hole 211' is installed at a corresponding position of the corresponding transmission shaft 22 such that the second eccentric end 223 of the transmission shaft 22 penetrates through and the second eccentric end 223 can be connected to the second cycloid gear disk 21b. The second output gear disk 23' further includes at least one externally fitted hole 230', and each externally fitted hole 230' is installed at a corresponding position of the corresponding transmission shaft 22 such that the second concentric end 224 of the transmission shaft 22 penetrates through and the second concentric end 224 can be connected to the second output gear disk 23'.

[0022] Also, in this embodiment, the rotary bearing assembly 1 further includes a first bearing 24 and a second bearing 24' having the same structure. The first bearing 24 is externally fitted between the externally fitted hole 211 of the first cycloid gear disk 21a and the first eccentric end 222, and the second bearing 24' is externally fitted between the externally fitted hole 211' of the second cycloid gear disk 21b and the second eccentric end 223. Also, the first bearing 24 and the second bearing 24' each include a plurality of output eccentric shaft needle rollers 241 (since the first bearing 24 and the second bearing 24' have the same structure, only the output eccentric shaft needle rollers 241 of the first bearing 24 are illustrated in FIG. 6). The plurality of output eccentric shaft needle rollers 241 of the first bearing 24 orbit around the main body of the first bearing 24. When the first bearing 24 is externally fitted between the externally fitted hole 211 of the first cycloid gear disk 21a and the first eccentric end 222, the plurality of output eccentric shaft needle rollers 241 of the first bearing 24 orbit around the outer ring wall of the first eccentric end 222. Similarly, the plurality of output eccentric shaft needle rollers 241 of the second bearing 24' orbit around the main body of the second bearing 24'. When the second bearing 24' is externally fitted between the externally fitted hole 211' of the second cycloid gear disk 21b and the second eccentric end 223, the plurality of output eccentric shaft needle rollers 241 of the second bearing 24' orbit around the outer ring wall of the second eccentric end 223. Also, the diameter of the transmission shaft of the transmission shaft 22 is d1 (that is, the diameters of the first concentric end 221, the first eccentric end 222, the second eccentric end 223, and the second concentric end 224 are each d1, that is, ΦA = ΦC = ΦD = ΦB). Referring also to FIG. 7. The diameter of each output eccentric shaft needle roller 241 is d2, and the diameters of the externally fitted holes 211 and 211' are each d3. The diameters d3 of the externally fitted holes 221 and 221' are each equal to the sum of twice the diameter d1 of the transmission shaft of the first eccentric end 222 and the diameter d2 of the output eccentric shaft needle roller 241 (that is, d3 = d1 + 2d2). Further, twice the diameter d2 of the output eccentric shaft needle roller 241 is not less than the first eccentricity amount E1 (that is, 2d2 ≧ E1).

[0023] Refer to FIGS. 3, 5, 7, and 8. In this embodiment, the first bearing 24 and the second bearing 24' each further include a plurality of roller cages 242. A roller cage 242 that covers and supports the output eccentric shaft needle rollers 241 is provided between any two adjacent ones of the plurality of output eccentric shaft needle rollers 241. Further, each output eccentric shaft needle roller 241 may have a gap G interposed therebetween and the corresponding roller cage 242 adjacent to the output eccentric shaft needle roller 241 inside the corresponding bearing. Therefore, when twice the diameter d2 of the output eccentric shaft needle roller 241 is equal to or greater than the first eccentricity amount E1, the first bearing 24 and the second bearing 24' can be reliably externally fitted to the corresponding first eccentric end 222 and second eccentric end 223, respectively. Also, the connection between the first concentric end 221 and the first output gear disk 23, and the connection between the second concentric end 224 and the second output gear disk 23' can also be performed by the same bearing structure as that of the first bearing 24 and the second bearing 24', and thus will not be repeated here.

[0024] Refer to FIGS. 1, 3, and 5. In this embodiment, the first cycloid gear disk 21a and the second cycloid gear disk 21b can be installed within the needle housing ring 300, and the first cycloid gear disk 21a and the second cycloid gear disk 21b can drive at least one output gear disk 23, 23' of the inner ring member 20 or the needle housing ring 300 of the outer ring member 30. In one embodiment, as a power transmission method of the rotary bearing assembly 1, when the input shaft 10 rotates, the first cycloid gear disk 21a and the second cycloid gear disk 21b are rotationally driven by the input shaft 10. The first cycloid gear disk 21a and the second cycloid gear disk 21b are respectively connected to the first eccentric end 222 and the second eccentric end 223 of the transmission shaft 22 to rotationally drive the transmission shaft 22, and synchronously rotate the first concentric end 221 and the second concentric end 224 of the transmission shaft 22 to respectively rotationally drive the first output gear disk 23 and the second output gear disk 23'. The first output gear disk 23 and / or the second output gear disk 23' functions as the power output of the rotary bearing assembly 1. In one embodiment, the first output gear disk 23 and / or the second output gear disk 23' can be fixed, and instead, the needle housing ring 300 of the outer ring member 30 can be used as the power output of the rotary bearing assembly 1. This will not be repeated here.

[0025] Refer to FIGS. 1, 9, and 10. The rotary bearing assembly of the second embodiment of the present invention is shown. In this embodiment, the structure of the rotary bearing assembly 1a is substantially the same as that of the rotary bearing assembly 1 shown in FIGS. 1 to 8. The same reference numerals represent the same components, structures, and functions, which will not be repeated here. The rotary bearing assembly 1 shown in FIGS. 1 to 8 includes two cycloid gear disks, while the rotary bearing assembly 1a of this embodiment includes a single cycloid gear disk, that is, the gear set 21 includes only the first cycloid gear disk 21a. The first cycloid gear disk 21a is externally fitted to the input shaft 10 and is rotationally driven by the input shaft 10, and includes a first tooth portion 210 that contacts a corresponding portion of at least one of the rollers 301. The input shaft 10 receives, for example, power input from a motor (not shown) and is rotationally driven by the power input. The input shaft 10 is located at the substantial center of the rotary bearing assembly 1a.

[0026] In this embodiment, at least one of the output gear disks 23, 23' includes, for example, the first output gear disk 23 and the second output gear disk 23' shown in FIG. 9. The first output gear disk 23 and the second output gear disk 23' are located on both opposite outer sides of the inner ring member 20. In this way, the first cycloid gear disk 21a is interposed between the first output gear disk 23 and the second output gear disk 23'. At least one of the first output gear disk 23 and the second output gear disk 23' can function as the power output of the rotary bearing assembly 1a. Of course, in other examples, the first output gear disk 23 and the second output gear disk 23' can be used as the fixed end, and the outer ring member 30 can be used as the output end.

[0027] In this embodiment, the transmission shaft 22a is a crankshaft and is connected to the first cycloid gear disk 21a, the first output gear disk 23, and the second output gear disk 23'. It includes a first concentric end 221a, a first eccentric end 222a, and a second concentric end 223a that are integrally formed and sequentially arranged. The first concentric end 221a is connected to the first output gear disk 23, the first eccentric end 222a is connected to the first cycloid gear disk 21a, and the second concentric end 223a is connected to the second output gear disk 23'. Also, there is an eccentricity between any two adjacent ones of the first concentric end 221a, the first eccentric end 222a, and the second concentric end 223a. Further, the diameter ΦA of the first concentric end 221a, the diameter ΦC of the first eccentric end 222a, and the diameter ΦB of the second concentric end 223a are all the same, that is, equal to the diameter d1 of the transmission shaft of the transmission shaft 22a (as shown in FIG. 7).

[0028] In this embodiment, in the rotary bearing assembly 1a, similarly, there is no need to limit the diameter of the eccentric end of the transmission shaft 22a to be larger than that of the concentric end, and the first concentric end 221a, the first eccentric end 222a, and the second concentric end 223a of the transmission shaft 22a are made to have the same diameter (ΦA1 = ΦC1 = ΦB1). Thereby, the rotary bearing assembly 1a can be miniaturized without increasing the diameter of the first eccentric end 222a. Further, since the first concentric end 221a, the first eccentric end 222a, and the second concentric end 223a of the transmission shaft 22a have the same diameter, when it is necessary to externally fit the corresponding bearings to the first concentric end 221a, the first eccentric end 222a, and the second concentric end 223a of the transmission shaft 22a respectively, these bearings can be of the same specification, and the material cost can be reduced. Furthermore, since the first concentric end 221a, the first eccentric end 222a, and the second concentric end 223a of the transmission shaft 22a of the present invention are integrally formed, the installation accuracy of the transmission shaft 22a in the rotary bearing assembly 1a can be further improved.

[0029] In this embodiment, as shown in FIG. 10, when the amount of eccentricity between the first concentric end 221a and the first eccentric end 222a is defined as the first amount of eccentricity E1, and the amount of eccentricity between the second concentric end 223a and the first eccentric end 222a is defined as the second amount of eccentricity E2, the first amount of eccentricity E1 is equal to the second amount of eccentricity E2. Thereby, it becomes easy to externally fit the corresponding bearings to the first concentric end 221a, the first eccentric end 222a, and the second concentric end 223a of the transmission shaft 22a respectively. Further, in this embodiment, the first concentric end 221a and the second concentric end 223a are coaxial with the transmission shaft 22a, and the first eccentric end 222a is installed eccentrically with respect to the transmission shaft 22a.

[0030] Similarly, in this embodiment, as the power transmission method of the rotary bearing assembly 1a, when the input shaft 10 rotates, the first cycloidal gear disk 21a is rotationally driven by the input shaft 10. The first cycloidal gear disk 21a rotationally drives the transmission shaft 22a by connecting to the first eccentric end 222a of the transmission shaft 22a, and synchronously rotates the first concentric end 221a and the second concentric end 223a of the transmission shaft 22a to rotationally drive the first output gear disk 23 and the second output gear disk 23', respectively. The first output gear disk 23 and / or the second output gear disk 23' functions as the power output of the rotary bearing assembly 1a. Of course, in other embodiments, the first output gear disk 23 and / or the second output gear disk 23' can be fixed, and instead, the outer ring member 30 can be used as the power output of the rotary bearing assembly 1a. This will not be repeated here.

[0031] Referring to FIGS. 11 to 18, a rotary bearing assembly according to a third embodiment of the present invention is shown. First, referring to FIGS. 11 to 13. In this embodiment, the structure of the rotary bearing assembly 1b is substantially the same as that of the rotary bearing assembly 1 shown in FIGS. 1 to 8. The same reference numerals represent the same components, structures, and functions, and will not be repeated here. In this embodiment, the load member 40a includes a plurality of bearing rolling elements 42. The outer ring member 30a is an internal gear including an internal gear main body 31, an internal tooth portion 32, and at least one running track 35 for the plurality of bearing rolling elements 42 to run. The running tracks 35 can be installed in pairs, have an inclination angle with respect to the axis of the input shaft 10, and the gear set 21 of the inner ring member 20 meshes with the internal tooth portion 32 of the internal gear.

[0032] Referring to FIGS. 14 to 15. In this embodiment, the internal tooth portion 32 is annularly installed on the inner ring surface 33 of the internal gear main body 31 and has a gear bottom diameter D1. The running track 35 is installed on one side of the internal gear, and the innermost ring 34 adjacent to the internal tooth portion 32 has an orbital ring inner diameter D2, and the orbital ring inner diameter D2 is greater than or equal to the gear bottom diameter D1. In this embodiment, the running track 35 spatially corresponds to the internal gear main body 31 and the output gear disk 23' of the inner ring member 20, and is a parallelogram in the radial cross-section, so that the plurality of bearing rolling elements 42 roll between the internal gear main body 31 and the output gear disk 23' of the inner ring member 20.

[0033] Refer to FIGS. 14 and 17. In this embodiment, when the input shaft 10 rotates, the first cycloidal gear disk 21a and the second cycloidal gear disk 21b are rotationally driven by the input shaft 10. The first cycloidal gear disk 21a and the second cycloidal gear disk 21b respectively rotationally drive the transmission shaft 22. As a result, the transmission shaft 22 rotationally drives the first output gear disk 23 and the second output gear disk 23'. The first output gear disk 23 and / or the second output gear disk 23' functions as the power output of the rotary bearing assembly 1b. For example, the second output gear 23' provides the power output, and the first output gear disk 23 is covered by the fixed housing base 80. The fixed housing base 80 can be combined with the outer ring member 30a to form a fixed end. Of course, in other embodiments, the first output gear disk 23 and / or the second output gear disk 23' can be fixed, and instead, the outer ring member 30a can be used as the power output of the rotary bearing assembly 1b. The present invention is not limited thereto.

[0034] Refer to FIGS. 19 to 22, which show the rotary bearing assembly according to the fourth embodiment of the present invention. In this embodiment, the structure of the rotary bearing assembly 1c is substantially the same as that of the rotary bearing assembly 1 shown in FIGS. 1 to 8. The same reference numerals represent the same components, structures, and functions, and will not be repeated here. In this embodiment, the outer ring member 30b includes a pair of roller retaining rings 39 and a running track 35. The pair of roller retaining rings 39 are respectively installed on opposite sides via the accommodation grooves 36. The running track 35 is located on both outer sides of the outer ring member 30b facing each other and is installed adjacent to the roller retaining ring 39. The load member 40b includes a plurality of bearing rolling elements 42, and the running track 35 is for the plurality of bearing rolling elements 42 to run.

[0035] As described above, the present invention provides a bearing having a high load capacity while having the advantage of a small volume, and a rotary bearing assembly for constructing a high speed ratio and a reduction output. By combining the use of the rotary bearing assembly and the speed reducer, the overall volume and the number of parts can be reduced under the same load, the assembly process can be facilitated, and the disadvantages of the conventional cycloid speed reducer, such as being disadvantageous for miniaturization and not being able to share bearing materials, can be solved. On the other hand, the concentric end and the eccentric end of the transmission shaft used in the rotary bearing assembly have the same diameter, and miniaturization can be achieved without increasing the diameter of the eccentric end. Further, since the concentric end and the eccentric end of the transmission shaft have the same diameter, bearings externally fitted to the concentric end and the eccentric end of the transmission shaft can be of the same specification, and the material cost can be reduced. Furthermore, since the concentric end and the eccentric end of the transmission shaft of the present invention are integrally formed, the installation accuracy and the alignment accuracy of the transmission shaft in the rotary bearing assembly can be further improved.

Explanation of Signs

[0036] 1, 1a, 1b, 1c: Rotary bearing assembly 10: Input shaft 20: Inner ring member 21: Gear set 21a: First cycloid gear disk 21b: Second cycloid gear disk 210: First tooth part 210': Second tooth part 211, 211', 230, 230': Externally fitted hole 22, 22a: Transmission shaft 221, 221a: First concentric end 222, 221a: First eccentric end 223: Second eccentric end 224, 223a: Second concentric end 23: First output gear disk 23': Second output gear disk 24: First bearing 24': Second bearing 241: Output eccentric shaft needle roller 242: Roller retainer 30, 30a, 30b: Outer ring member 300: Needle housing gear 301: Roller 31: Internal gear body 32: Internal tooth part 33: Inner ring surface 34: Innermost ring 35: Running track 36: Accommodation groove 39: Roller stop ring 40, 40a, 40b: Load member 41: Retainer 42: Bearing rolling element 43, 44: Track wheel 8: Plane 80: Fixed housing base 90: Motor 91: Motor housing 92: Rotating shaft d1: Diameter of transmission shaft d2: Diameter of output eccentric shaft needle roller d3: Diameter of externally fitted hole d4: Inner diameter of track wheel d5: Outer diameter of cycloid gear disk ΦA, ΦC, ΦD, ΦB: Diameter D1: Bottom diameter of gear D2: Inner diameter of track wheel E1: First eccentricity E2: Second eccentricity E3: Third eccentricity G: Gap P1, P2, P3: Area X, Y, Z: Axis

Claims

1. A rotary bearing assembly comprising an input shaft, an inner ring member, and an outer ring member, wherein the input shaft is coupled to the rotating shaft of a motor and rotates to provide power input, the inner ring member includes at least one output gear disk, a transmission shaft, and a gear set, is externally fitted to the input shaft via the gear set, and is driven by the input shaft, the outer ring member is externally fitted to the inner ring member via a load member, and meshes with the gear set, when the gear set is driven by the input shaft to move the inner ring member, the gear set moves the outer ring member, and the inner ring member and the outer ring member rotate relative to each other, and one of the inner ring member and the outer ring member provides power output, and there is a rotational speed difference between the power input and the power output, the load member includes a plurality of bearing rolling elements, the outer ring member is an internal gear having an internal gear body, an internal gear portion, and a running track for the plurality of bearing rolling elements to run, the running track has an inclination angle with respect to the axial direction of the input shaft, and the gear set of the inner ring member meshes with the internal gear portion of the internal gear, the transmission shaft includes a first concentric end, a first eccentric end, a second eccentric end, and a second concentric end that are integrally formed and sequentially arranged, and there is a first eccentricity between the first concentric end and the first eccentric end, the inner ring member further includes a first bearing and a second bearing, the first bearing and the second bearing each include a plurality of output eccentric shaft needle rollers, and twice the diameter of the output eccentric shaft needle rollers is greater than or equal to the first eccentricity, a rotary bearing assembly.

2. The outer ring member is an output end, the inner ring member is a fixed end, the at least one output gear disk is fixedly installed and connected to the gear set via the transmission shaft, when the gear set is driven by the input shaft, the gear set moves the outer ring member to provide the power output, the rotary bearing assembly according to claim 1.

3. The outer ring member is a fixed end, the inner ring member is an output end, the at least one output gear disk is connected to the gear set via the transmission shaft, when the gear set is driven by the input shaft, the gear set moves the at least one output gear disk via the transmission shaft to provide the power output, the rotary bearing assembly according to claim 1.

4. The gear set includes a first cycloid gear disk and a second cycloid gear disk, The first cycloidal gear disk is externally fitted to the input shaft, rotationally driven by the input shaft, and includes a first tooth portion that contacts a corresponding portion of the internal tooth portion. The second cycloidal gear disk is externally fitted to the input shaft, rotationally driven by the input shaft, and includes a second tooth portion that contacts a corresponding portion of the internal tooth portion. The first cycloidal gear disk and the second cycloidal gear disk are respectively located on both opposite sides of the internal gear, and the rotary bearing assembly according to claim 2 or 3.

5. The first eccentric end is connected to the first cycloidal gear disk, the second eccentric end is connected to the second cycloidal gear disk, and among the first concentric end, the first eccentric end, the second eccentric end, and the second concentric end, there is an eccentricity between any adjacent two of them. The diameters of the first concentric end, the first eccentric end, the second eccentric end, and the second concentric end are all the same, and the at least one output gear disk is connected to the first concentric end or the second concentric end, and the rotary bearing assembly according to claim 4.

6. The eccentricity between the second concentric end and the second eccentric end is defined as the second eccentricity, the eccentricity between the first eccentric end and the second eccentric end is defined as the third eccentricity, the first eccentricity is equal to the second eccentricity, and the third eccentricity is equal to twice the first eccentricity, and the rotary bearing assembly according to claim 5.

7. The plurality of output eccentric shaft needle rollers of the first bearing orbit the outer ring wall of the first eccentric end, and the plurality of output eccentric shaft needle rollers of the second bearing orbit the outer ring wall of the second eccentric end, and the rotary bearing assembly according to claim 1.

8. The at least one output gear disk includes a first output gear disk and a second output gear disk located on both opposite sides of the internal gear. The first output gear disk further includes an externally fitted hole, and the externally fitted hole of the first output gear disk is installed at a position corresponding to the transmission shaft so that the first concentric end of the transmission shaft penetrates through it. The second output gear disk further includes an externally fitted hole, and the externally fitted hole of the second output gear disk is installed at a position corresponding to the transmission shaft so that the second concentric end of the transmission shaft penetrates through it, and the rotary bearing assembly according to claim 7.

9. The internal diameter of the externally inserted hole is equal to the sum of the diameter of the transmission shaft and twice the diameter of the output eccentric shaft needle roller, for the rotary bearing assembly according to claim 8.

10. The internal tooth part is annularly installed on the inner ring surface of the internal gear body and has a gear bottom diameter. The running track is installed on one side of the internal gear and has an inner diameter of the track wheel near the internal tooth part. The inner diameter of the track wheel is not less than the gear bottom diameter, for the rotary bearing assembly according to claim 1.

11. The space formed by the running track and at least one of the output tooth discs of the internal gear body and the inner ring member is a parallelogram in the radial cross-section of the internal gear body and the at least one output tooth disc, so that a plurality of bearing rolling elements roll between the internal gear body and at least one of the output tooth discs of the inner ring member, for the rotary bearing assembly according to claim 1.

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