Coaxial inner and outer independent rotation structure

Abstract

This utility model discloses a coaxial independent rotation structure, relating to the field of shaft transmission technology. It includes a main shaft, with an inner sleeve fitted on the outer side of the main shaft, and the main shaft and the inner sleeve are rotatably connected via a first bearing assembly. An outer sleeve is fitted on the outer side of the inner sleeve, and the inner sleeve and the outer sleeve are rotatably connected via a second bearing assembly. A main shaft pulley is installed at the lower end of the main shaft extending from the inner sleeve, and a first rotating component is installed at the upper end of the main shaft extending from the inner sleeve. An inner sleeve pulley is installed at the lower end of the inner sleeve extending from the outer sleeve, and a second rotating component is installed at the upper end of the inner sleeve extending from the outer sleeve. This coaxial independent rotation structure enables independent rotation of different rotating components on the same axis, and features reasonable force distribution, high load-bearing capacity, stable operation, long service life, and low maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of shaft transmission technology, and in particular to a coaxial internal and external independent rotation structure. Background Technology

[0002] In practical applications, it is sometimes necessary to achieve relative rotation of two different rotating parts on the same axis in the same or opposite directions at different speeds to meet usage requirements. In existing coaxial independent rotating structures used to achieve the above functions, the bearings are mostly poorly arranged, resulting in low axial load capacity, failure to meet stress requirements, poor operational stability, and are especially unsuitable for vertical transmission structures. The bearings are prone to failure, have short service life, and high maintenance costs. Utility Model Content

[0003] To address the above deficiencies, the purpose of this utility model is to provide a coaxial internal and external independent rotation structure. This coaxial internal and external independent rotation structure can realize the independent rotation of different coaxial rotating parts, and has reasonable force distribution, high load-bearing capacity, stable operation, long service life, and low maintenance cost.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A coaxial, independently rotating structure includes a main shaft, an inner sleeve fitted on the outer side of the main shaft, and the main shaft and the inner sleeve being rotatably connected via a first bearing assembly; an outer sleeve fitted on the outer side of the inner sleeve, and the inner sleeve and the outer sleeve being rotatably connected via a second bearing assembly; a main shaft pulley is mounted on the lower end of the main shaft extending out of the inner sleeve, and a first rotating component is mounted on the upper end of the main shaft extending out of the inner sleeve; an inner sleeve pulley is mounted on the lower end of the inner sleeve extending out of the outer sleeve, and a second rotating component is mounted on the upper end of the inner sleeve extending out of the outer sleeve.

[0006] The first bearing assembly includes a main shaft cylindrical roller bearing installed between the upper end of the inner sleeve and the main shaft, and a main shaft angular contact ball bearing installed between the lower end of the inner sleeve and the main shaft; the second bearing assembly includes an inner sleeve cylindrical roller bearing installed between the upper end of the outer sleeve and the inner sleeve, and an inner sleeve angular contact ball bearing installed between the lower end of the outer sleeve and the inner sleeve.

[0007] The main shaft, located above the cylindrical roller bearing, is fitted with an inner bearing spacer. An inner upper cover is fitted on the outer side of the inner bearing spacer. The lower side of the inner upper cover overlaps the upper end face of the inner sleeve. A labyrinth cover is fitted on the main shaft, located above the inner bearing spacer. The lower side of the labyrinth cover and the upper side of the inner upper cover have a first labyrinth structure that cooperates with each other. The first rotating component is located above the labyrinth cover.

[0008] An adjusting shim is fitted on the main shaft located between the inner spacer of the bearing and the labyrinth cover, and the vertical gap of the first labyrinth structure is determined by the thickness of the adjusting shim.

[0009] The upper end of the outer sleeve is fitted with an upper cover, the second rotating component is located on the upper cover, and a second labyrinth structure is provided between the lower side of the second rotating component and the upper side of the upper cover; a gasket is provided between the part of the upper cover of the inner sleeve that protrudes from the inner sleeve and the upper side of the second rotating component.

[0010] The inner sleeve between the inner cylindrical roller bearing and the inner angular contact ball bearing is fitted with an inner locating sleeve for the outer bearing; the inner sleeve between the inner angular contact ball bearing and the inner pulley is fitted with an outer locating sleeve for the outer bearing. The inner ring of the inner cylindrical roller bearing is fixed between the outer stepped surface of the inner sleeve and the inner locating sleeve for the outer bearing. An outer bearing retaining ring is provided on the upper stepped surface of the outer sleeve, and the outer bearing retaining ring is fitted outside the inner locating sleeve for the outer bearing. The outer ring of the inner cylindrical roller bearing is fixed between the outer bearing retaining ring and the upper cover of the outer sleeve. The inner ring of the inner angular contact ball bearing is fixed between the inner locating sleeve and the outer locating sleeve for the outer bearing. A lower cover for the outer sleeve is fastened to the lower end of the outer sleeve, and the lower cover for the outer sleeve is fitted outside the outer locating sleeve for the outer bearing. The outer ring of the inner angular contact ball bearing is fixed between the lower stepped surface of the outer sleeve and the lower cover for the outer sleeve.

[0011] The inner ring of the main shaft cylindrical roller bearing is fixed between the upper stepped surface of the main shaft and the inner bearing sleeve. An inner bearing retaining ring is provided on the upper stepped surface inside the inner sleeve. The outer ring of the main shaft cylindrical roller bearing is fixed between the pressure cap on the inner sleeve and the inner bearing retaining ring. An inner bearing positioning sleeve is fitted on the main shaft located below the main shaft angular contact ball bearing. The inner ring of the main shaft angular contact ball bearing is fixed between the lower stepped surface of the main shaft and the inner bearing positioning sleeve. A sealing pressure cap is fitted between the inner sleeve and the inner bearing positioning sleeve. The outer ring of the main shaft angular contact ball bearing is fixed between the lower stepped surface inside the inner sleeve and the sealing pressure cap.

[0012] Specifically, a first skeleton oil seal is provided between the inner groove of the inner sleeve upper pressure cover and the inner spacer of the bearing; a second skeleton oil seal is provided between the inner groove of the outer sleeve upper pressure cover and the inner sleeve; a third skeleton oil seal is provided between the inner groove of the outer sleeve lower pressure cover and the outer positioning sleeve of the outer bearing; and a fourth skeleton oil seal is provided between the inner bearing positioning sleeve and the sealing pressure cover.

[0013] Specifically, a first locking washer is fitted on the main shaft located above the first rotating component, and a shaft cap is threaded onto the main shaft above the first locking washer; a second locking washer is fitted on the inner sleeve located below the inner sleeve pulley, and a first nut is threaded onto the inner sleeve below the second locking washer; a third locking washer is fitted on the main shaft located below the inner bearing positioning sleeve, and a second nut is threaded onto the main shaft below the third locking washer; a fourth locking washer is fitted on the main shaft located below the main shaft pulley, and a third nut is threaded onto the main shaft below the fourth locking washer.

[0014] The main shaft has an axially extending first lubricating oil channel at its upper end, and a first grease fitting is installed at the port of the first lubricating oil channel; a radially extending second lubricating oil channel is provided on the outer sleeve and the upper cover of the outer sleeve, located on the upper side of the inner cylindrical roller bearing, and a second grease fitting is installed at the port of the second lubricating oil channel; a radially extending third lubricating oil channel is provided on the outer sleeve between the inner cylindrical roller bearing and the inner angular contact ball bearing, and a third grease fitting is installed at the port of the third lubricating oil channel; and an axially extending fourth lubricating oil channel is provided at the lower end of the main shaft, and a fourth grease fitting is installed at the port of the fourth lubricating oil channel.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] This utility model's coaxial independent rotating structure includes a main shaft, with an inner sleeve fitted on the outer side of the main shaft, and the main shaft and inner sleeve are rotatably connected via a first bearing assembly; an outer sleeve is fitted on the outer side of the inner sleeve, and the inner sleeve and outer sleeve are rotatably connected via a second bearing assembly; a main shaft pulley is installed at the lower end of the main shaft extending out of the inner sleeve, and a first rotating component is installed at the upper end of the main shaft extending out of the inner sleeve; an inner sleeve pulley is installed at the lower end of the inner sleeve extending out of the outer sleeve, and a second rotating component is installed at the upper end of the inner sleeve extending out of the outer sleeve. Driven by a power device, the main shaft pulley drives the main shaft and the first rotating component to rotate relative to the inner sleeve. Driven by another power device, the inner sleeve pulley drives the inner sleeve and the second rotating component to rotate relative to the main shaft and the outer sleeve. The two driving forces can run in the same direction or in opposite directions, at the same speed or different speeds, thus achieving coaxial independent rotation of the two rotating components. Furthermore, the use of bearing assemblies ensures that the utility model experiences reasonable force distribution during rotation, has high load-bearing capacity, stable operation, long bearing life, and low maintenance costs.

[0017] In summary, the coaxial independent rotation structure of this utility model solves the technical problems of low service life and high maintenance cost of existing coaxial independent rotation structures. The coaxial independent rotation structure of this utility model can realize the independent rotation of different coaxial rotating parts, and has reasonable force distribution, high load-bearing capacity, stable operation, long service life and low maintenance cost. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the coaxial internal and external independent rotation structure of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of part A;

[0020] In the diagram: 10. Main spindle; 11. Main spindle cylindrical roller bearing; 12. Shaft cap; 13. Main spindle angular contact ball bearing; 14. Main spindle pulley; 15. Inner bearing spacer; 16. Inner bearing locating sleeve; 20. Labyrinth cover; 21. Adjusting shim; 22. Inner sleeve upper pressure cover; 24. Washer ring; 25. Inner bearing retaining ring; 26. First skeleton oil seal; 27. First bolt; 28. Second bolt; 29. ​​Hole elastic retaining ring; 30. Inner sleeve; 32. Outer bearing inner locating sleeve; 34. Outer bearing outer locating sleeve; 36. Inner sleeve pulley; 40. Outer sleeve; 42. Outer sleeve upper pressure cover; 44. Second skeleton oil seal; 46. Third bolt; 47. Fourth bolt; 48. Outer sleeve lower... 49. Sealing cap; 50. Third skeleton oil seal; 51. Inner cylindrical roller bearing; 52. Outer bearing retaining ring; 54. Inner angular contact ball bearing; 60. Sealing cap; 62. Fourth skeleton oil seal; 70. First locking washer; 71. First nut; 72. Second locking washer; 73. Second nut; 74. Third locking washer; 75. Third nut; 76. Fourth locking washer; 80. First grease nipple; 81. First lubricating oil passage; 82. Second grease nipple; 83. Second lubricating oil passage; 84. Third grease nipple; 85. Third lubricating oil passage; 86. Fourth grease nipple; 87. Fourth lubricating oil passage; 90. First rotating component; 92. Second rotating component. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] The directions mentioned in this manual are based on the directions shown in the attached diagram and represent only relative positional relationships, not absolute positional relationships.

[0023] like Figure 1As shown, a coaxial, independently rotating structure includes a main shaft 10, with an inner sleeve 30 fitted on the outer side of the main shaft 10. The main shaft 10 and the inner sleeve 30 are rotatably connected by a first bearing assembly. An outer sleeve 40 is fitted on the outer side of the inner sleeve 30, and the inner sleeve 30 and the outer sleeve 40 are rotatably connected by a second bearing assembly. The length of the main shaft 10 is greater than the length of the inner sleeve 30. Both the upper and lower ends of the main shaft 10 are located outside the inner sleeve 30. The lower end of the main shaft 10 extends out of the inner sleeve 30 and is fixedly mounted with a main shaft pulley 14 via a flat key. The upper end of the main shaft 10 extends out of the inner sleeve 30 and is fixedly mounted with a first rotating component 90 via a flat key. The length of the inner sleeve 30 is greater than the length of the outer sleeve 40. Both the upper and lower ends of the inner sleeve 30 are located outside the outer sleeve 40. The lower end of the inner sleeve 30 extends out of the outer sleeve 40 and is fixedly mounted with an inner sleeve pulley 36 via a flat key. The upper end of the inner sleeve 30 extends out of the outer sleeve 40 and is fixedly mounted with a second rotating component 92. The main shaft pulley 14 and the inner sleeve pulley 36 can be connected to different power devices. These two power devices can run in the same direction or in opposite directions, at the same speed or at different speeds. Under the drive of different power devices, the main shaft 10 and the inner sleeve 30 drive the first rotating part 90 and the second rotating part 92 to achieve coaxial independent rotation.

[0024] like Figure 1 As shown, the first bearing assembly includes a pair of main shaft cylindrical roller bearings 11 installed between the upper inner side of the inner sleeve 30 and the main shaft 10, and a pair of main shaft angular contact ball bearings 13 installed between the lower inner side of the inner sleeve 30 and the main shaft 10. The outer ring of the main shaft cylindrical roller bearing 11 is fitted to the inner sleeve 30, and the inner ring of the main shaft cylindrical roller bearing 11 is fitted to the main shaft 10. The outer ring of the main shaft angular contact ball bearing 13 is fitted to the inner sleeve 30, and the inner ring of the main shaft angular contact ball bearing 13 is fitted to the main shaft 10.

[0025] like Figure 1 As shown, the second bearing assembly includes an inner cylindrical roller bearing 50 installed between the upper inner side of the outer sleeve 40 and the outer side of the inner sleeve 30, and a pair of inner angular contact ball bearings 54 installed between the lower inner side of the outer sleeve 40 and the outer side of the inner sleeve 30. The outer ring of the inner cylindrical roller bearing 50 is fitted to the outer sleeve 40, and the inner ring of the inner cylindrical roller bearing 50 is fitted to the inner sleeve 30. The outer ring of the inner angular contact ball bearing 54 is fitted to the outer sleeve 40, and the inner ring of the inner angular contact ball bearing 54 is fitted to the inner sleeve 30. This embodiment uses a combination of cylindrical roller bearings and angular contact ball bearings, which results in reasonable shaft stress, high load-bearing capacity, stable operation, and helps extend the service life of the bearings and reduce maintenance costs.

[0026] like Figure 1As shown, a bearing inner sleeve 15 is fitted on the main shaft 10 located above the main shaft cylindrical roller bearing 11. The inner ring of the main shaft cylindrical roller bearing 11 is fixed between the bearing inner sleeve 15 and the upper stepped surface of the main shaft 10. The inner side of the upper end of the inner sleeve 30 is provided with a concave upper stepped surface. An inner bearing retaining ring 25 fitted on the main shaft 10 is provided on the upper stepped surface. An inner sleeve upper pressure cover 22 is fixed at the upper end of the inner sleeve 30. The inner sleeve upper pressure cover 22 is fitted on the outer side of the bearing inner sleeve 15. A downwardly protruding annular structure is provided at the lower center of the inner sleeve upper pressure cover 22. When the inner sleeve upper pressure cover 22 is fastened to the upper end of the inner sleeve 30, its annular structure is inserted between the inner sleeve 30 and the bearing inner sleeve 15. The outer ring of the main shaft cylindrical roller bearing 11 is fixed between the annular structure of the inner sleeve upper pressure cover 22 and the inner bearing retaining ring 25.

[0027] like Figure 1 As shown, an inner bearing positioning sleeve 16 is fitted on the spindle 10 located below the spindle angular contact ball bearing 13. The inner ring of the spindle angular contact ball bearing 13 is fixed between the lower stepped surface of the spindle 10 and the inner bearing positioning sleeve 16. The lower inner end of the inner sleeve 30 has a concave lower stepped surface. A sealing cap 60 is fitted between the inner sleeve 30 and the inner bearing positioning sleeve 16. The outer ring of the spindle angular contact ball bearing 13 is fixed between the lower stepped surface of the inner sleeve 30 and the sealing cap 60.

[0028] like Figure 1 As shown, the outer side of the inner sleeve 30 has a concave outer stepped surface. An outer bearing inner positioning sleeve 32 is fitted on the inner sleeve 30, which is located between the inner cylindrical roller bearing 50 and the inner angular contact ball bearing 54. The inner ring of the inner cylindrical roller bearing 50 is fixed between the outer stepped surface of the inner sleeve 30 and the outer bearing inner positioning sleeve 32. The inner side of the upper end of the outer sleeve 40 has a concave upper stepped surface. An outer bearing retaining ring 52 is provided on the upper stepped surface. The outer bearing retaining ring 52 is fitted on the outer side of the outer bearing inner positioning sleeve 32. The upper end of the outer sleeve 40 is fixed with an upper cover 42 by a third bolt 46. The lower middle part of the upper cover 42 has a downwardly protruding annular structure. When the upper cover 42 is fastened to the upper end of the outer sleeve 40, its annular structure is inserted into the inner side of the outer sleeve 40. The outer ring of the inner cylindrical roller bearing 50 is fixed between the annular structure of the upper cover 42 and the outer bearing retaining ring 52.

[0029] like Figure 1As shown, an outer bearing outer positioning sleeve 34 is fitted onto the inner sleeve 30 located between the inner sleeve angular contact ball bearing 54 and the inner sleeve pulley 36. The inner ring of the inner sleeve angular contact ball bearing 54 is fixed between the outer bearing inner positioning sleeve 32 and the outer bearing outer positioning sleeve 34. The lower end of the outer sleeve 40 has a concave lower step surface. The lower end of the outer sleeve 40 is fixed with an outer sleeve lower pressure cover 48 by a fourth bolt 47. The outer sleeve lower pressure cover 48 is fitted onto the outer side of the outer bearing outer positioning sleeve 34. The upper middle part of the outer sleeve lower pressure cover 48 has an upwardly protruding annular structure. When the outer sleeve lower pressure cover 48 is fastened to the lower end of the outer sleeve 40, its annular structure is inserted into the inner side of the outer sleeve 40, and the outer ring of the inner sleeve angular contact ball bearing 54 is fixed between the lower step surface of the outer sleeve 40 and the annular structure of the outer sleeve lower pressure cover 48.

[0030] like Figure 1 As shown, a labyrinth cover 20 is fitted onto the main shaft 10 located on the upper side of the inner bearing sleeve 15. The labyrinth cover 20 is a cap-shaped structure with its edges bent downwards. The lower side of the edge of the labyrinth cover 20 and the upper side of the inner sleeve upper pressure cover 22 are provided with a first labyrinth structure that cooperates with each other. The first labyrinth structure includes an upwardly recessed annular groove provided on the lower side of the edge of the labyrinth cover 20, and an upwardly protruding annular ridge provided on the upper side of the inner sleeve upper pressure cover 22. When the labyrinth cover 20 is closed, the annular ridge is inserted into the annular groove. An adjusting shim 21 is fitted on the main shaft 10 located between the labyrinth cover 20 and the inner bearing sleeve 15. The size of the adjusting shim 21 is smaller than the inner diameter of the edge of the labyrinth cover 20. The adjusting shim 21 is fixed on the inner bearing sleeve 15. The vertical gap of the first labyrinth structure can be adjusted by changing the thickness of the adjusting shim 21. The vertical gap of the first labyrinth structure is also the gap between the labyrinth cover 20 and the pressure cap 22 on the inner sleeve. The larger the thickness of the adjusting shim 21, the larger the vertical gap of the first labyrinth structure. Conversely, the smaller the thickness of the adjusting shim 21, the smaller the vertical gap of the first labyrinth structure. Therefore, the size of the vertical gap of the first labyrinth structure is determined by the thickness of the adjusting shim 21.

[0031] like Figure 1As shown, the lower side of the inner sleeve upper pressure cap 22, located on the outer side of its annular structure, overlaps the upper end face of the inner sleeve 30. The overlapping portion of the inner sleeve upper pressure cap 22 and the inner sleeve 30 is connected as a whole by the first bolt 27. The second rotating member 92 is located above the outer sleeve upper pressure cap 42. A washer 24 is provided between the portion of the inner sleeve upper pressure cap 22 protruding from the inner sleeve 30 and the second rotating member 92. The washer 24 is fitted onto the outer side of the inner sleeve 30. The inner sleeve upper pressure cap 22, the washer 24, and the second rotating member 92 are connected as a whole by the second bolt 28. The first bolt 27 is located on the inner side of the labyrinth cover 20, and the second bolt 28 is located on the outer side of the labyrinth cover 20. A second labyrinth structure is provided between the lower side of the second rotating member 92 and the upper cover 42 of the outer sleeve. The second labyrinth structure is located between the inner sleeve 30 and the second bolt 28. It includes an upwardly recessed annular groove on the lower side of the second rotating member 92 and an upwardly protruding annular ridge on the upper side of the upper cover 42. The annular ridge is inserted into the annular groove.

[0032] like Figure 1 and Figure 2 As shown, the inner wall of the inner sleeve upper pressure cover 22 has a recessed inner groove, which is referred to as the first inner groove for easy distinction. Two stacked first skeleton oil seals 26 are provided between the first inner groove and the bearing inner spacer 15. An elastic retaining ring 29 for holes is installed on the side wall of the inner sleeve upper pressure cover 22 above the first skeleton oil seal 26. The elastic retaining ring 29 for holes positions the first skeleton oil seal 26 and prevents the first skeleton oil seal 26 from falling out. The inner wall of the outer sleeve upper pressure cover 42 has an upwardly recessed inner groove, which is referred to as the second inner groove. A second skeleton oil seal 44 is provided between the second inner groove and the inner sleeve 30. The inner wall of the outer sleeve lower pressure cover 48 has a downwardly recessed inner groove, which is referred to as the third inner groove. A third skeleton oil seal 49 is provided between the third inner groove and the outer bearing outer positioning sleeve 34. A fourth skeleton oil seal 62 is provided between the inner side of the sealing gland 60 and the inner bearing positioning sleeve 16. The arrangement of the first skeleton oil seal 26, the second skeleton oil seal 44, the third skeleton oil seal 49 and the fourth skeleton oil seal 62 can play a good sealing role, making the sealing of the structure simpler, more convenient and lower in cost.

[0033] like Figure 1As shown, the first rotating component 90 is located above the labyrinth cover 20. A first locking washer 70 is fitted on the main shaft 10 located above the first rotating component 90. A shaft cap 12 is threadedly connected to the main shaft 10 above the first locking washer 70. The first locking washer 70 prevents the shaft cap 12 from reversing and coming off. The shaft cap 12 and the first locking washer 70 together lock the first rotating component 90 onto the main shaft 10. A second locking washer 72 is fitted on the inner sleeve 30 located below the inner sleeve pulley 36. A first nut 71 is threadedly connected to the inner sleeve 30 below the second locking washer 72. The second locking washer 72 prevents the first nut 71 from reversing and coming off. The first nut 71 and the second locking washer 72 together lock the inner sleeve pulley 36 onto the inner sleeve 30. A third retaining washer 74 is fitted on the spindle 10 located below the inner bearing positioning sleeve 16. A second nut 73 is threadedly connected to the spindle 10 below the third retaining washer 74. The third retaining washer 74 prevents the second nut 73 from reversing and coming off. The second nut 73 and the third retaining washer 74 together lock the inner bearing positioning sleeve 16 onto the spindle 10, indirectly locking the spindle angular contact ball bearing 13 onto the spindle 10. A fourth retaining washer 76 is fitted on the spindle located below the spindle pulley 14. A third nut 75 is threadedly connected to the spindle below the fourth retaining washer 76. The fourth retaining washer 76 prevents the third nut 75 from reversing and coming off. The third nut 75 and the fourth retaining washer 76 together lock the spindle pulley 14 onto the spindle 10.

[0034] like Figure 1 As shown, the upper end of the main shaft 10 is provided with a first lubricating oil channel 81 that extends axially to the position of the main shaft cylindrical roller bearing 11. A first grease nipple 80 is installed at the port of the first lubricating oil channel 81, and the first grease nipple 80 is located inside the shaft cap 12. The outer sleeve 40 and the outer sleeve upper cover 42 located on the upper side of the inner sleeve cylindrical roller bearing 50 are provided with a radially extending second lubricating oil channel 83. The second lubricating oil channel 83 passes through the outer sleeve 40 and the outer sleeve upper cover 42, and connects to the cavity formed by the outer sleeve upper cover 42, the inner sleeve 30 and the inner sleeve cylindrical roller bearing 50. A second grease nipple 82 is installed at the port of the second lubricating oil channel 83 on the side of the outer sleeve 40. A radially extending third lubricating oil channel 85 is provided on the outer sleeve 40 located between the inner cylindrical roller bearing 50 and the inner angular contact ball bearing 54. The third lubricating oil channel 85 penetrates the outer sleeve 40 and connects to the cavity formed by the outer sleeve 40, the outer bearing retaining ring 52, the outer bearing inner locating sleeve 32, and the inner angular contact ball bearing 54. A third grease nipple 84 is installed at the port of the third lubricating oil channel 85 on the side of the outer sleeve 40. A fourth lubricating oil channel 87 is provided at the lower end of the spindle 10, extending axially to the position of the spindle angular contact ball bearing 13. A fourth grease nipple 86 is installed at the port of the fourth lubricating oil channel 87. The first grease nipple 80, the second grease nipple 82, the third grease nipple 84, and the fourth grease nipple 86 are used to lubricate the bearings.

[0035] In summary, the coaxial independent rotation structure of this utility model can realize the independent rotation of different rotating parts on the same axis, and has reasonable force distribution, high load-bearing capacity, stable operation, long service life, and low maintenance cost.

[0036] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A coaxial internal and external independent rotating structure, characterized in that, Includes a main shaft (10), an inner sleeve (30) is fitted on the outer side of the main shaft (10), and the main shaft (10) and the inner sleeve (30) are rotatably connected by a first bearing assembly; an outer sleeve (40) is fitted on the outer side of the inner sleeve (30), and the inner sleeve (30) and the outer sleeve (40) are rotatably connected by a second bearing assembly; a main shaft pulley (14) is installed at the lower end of the main shaft (10) extending out of the inner sleeve (30), and a first rotating component (90) is installed at the upper end of the main shaft (10) extending out of the inner sleeve (30); an inner sleeve pulley (36) is installed at the lower end of the inner sleeve (30) extending out of the outer sleeve (40), and a second rotating component (92) is installed at the upper end of the inner sleeve (30) extending out of the outer sleeve (40).

2. The coaxial internal and external independent rotation structure according to claim 1, characterized in that, The first bearing assembly includes a spindle cylindrical roller bearing (11) installed between the upper end of the inner sleeve (30) and the spindle (10), and a spindle angular contact ball bearing (13) installed between the lower end of the inner sleeve (30) and the spindle (10); the second bearing assembly includes an inner sleeve cylindrical roller bearing (50) installed between the upper end of the outer sleeve (40) and the inner sleeve (30), and an inner sleeve angular contact ball bearing (54) installed between the lower end of the outer sleeve (40) and the inner sleeve (30).

3. The coaxial internal and external independent rotation structure according to claim 2, characterized in that, A bearing inner sleeve (15) is fitted on the main shaft (10) located on the upper side of the main shaft cylindrical roller bearing (11). An inner sleeve upper pressure cover (22) is fitted on the outer side of the bearing inner sleeve (15). The lower side of the inner sleeve upper pressure cover (22) overlaps the upper end surface of the inner sleeve (30). A labyrinth cover (20) is fitted on the main shaft (10) located on the upper side of the bearing inner sleeve (15). The lower side of the labyrinth cover (20) and the upper side of the inner sleeve upper pressure cover (22) are provided with a first labyrinth structure that cooperates with each other. The first rotating member (90) is located above the labyrinth cover (20).

4. The coaxial internal and external independent rotation structure according to claim 3, characterized in that, An adjusting shim (21) is fitted on the main shaft (10) located between the inner bearing sleeve (15) and the labyrinth cover (20), and the vertical gap of the first labyrinth structure is determined by the thickness of the adjusting shim (21).

5. The coaxial internal and external independent rotation structure according to claim 4, characterized in that, The upper end of the outer sleeve (40) is fitted with an upper cover (42), the second rotating member (92) is located on the upper cover (42), and a second labyrinth structure is provided between the lower side of the second rotating member (92) and the upper side of the upper cover (42); a washer (24) is provided between the part of the inner cover (22) protruding from the inner sleeve (30) and the upper side of the second rotating member (92).

6. The coaxial internal and external independent rotation structure according to claim 5, characterized in that, An outer bearing inner positioning sleeve (32) is fitted on the inner sleeve (30) located between the inner cylindrical roller bearing (50) and the inner angular contact ball bearing (54). An outer bearing outer positioning sleeve (34) is fitted on the inner sleeve (30) located between the inner angular contact ball bearing (54) and the inner pulley (36). The inner ring of the inner cylindrical roller bearing (50) is fixed between the outer stepped surface of the inner sleeve (30) and the outer bearing inner positioning sleeve (32). An outer bearing retaining ring (52) is provided on the upper stepped surface of the outer sleeve (40). The outer bearing retaining ring (52) is fitted on the outer bearing inner positioning sleeve. The outer ring of the inner cylindrical roller bearing (50) is fixed between the outer bearing retaining ring (52) and the outer cover (42) on the outside of the sleeve (32); the inner ring of the inner angular contact ball bearing (54) is fixed between the outer bearing inner positioning sleeve (32) and the outer bearing outer positioning sleeve (34); the lower end of the outer sleeve (40) is fitted with an outer lower cover (48); the outer lower cover (48) is fitted on the outside of the outer bearing outer positioning sleeve (34); the outer ring of the inner angular contact ball bearing (54) is fixed between the lower step surface of the outer sleeve (40) and the outer lower cover (48).

7. The coaxial internal and external independent rotation structure according to claim 3, characterized in that, The inner ring of the main shaft cylindrical roller bearing (11) is fixed between the upper stepped surface of the main shaft (10) and the bearing inner spacer (15). An inner bearing retaining ring (25) is provided on the upper stepped surface inside the inner sleeve (30). The outer ring of the main shaft cylindrical roller bearing (11) is fixed between the inner sleeve upper cover (22) and the inner bearing retaining ring (25). An inner bearing positioning sleeve (16) is fitted on the main shaft (10) located below the main shaft angular contact ball bearing (13). The inner ring of the main shaft angular contact ball bearing (13) is fixed between the lower stepped surface of the main shaft (10) and the inner bearing positioning sleeve (16). A sealing cover (60) is fitted between the inner sleeve (30) and the inner bearing positioning sleeve (16). The outer ring of the main shaft angular contact ball bearing (13) is fixed between the lower stepped surface inside the inner sleeve (30) and the sealing cover (60).

8. The coaxial internal and external independent rotation structure according to claim 7, characterized in that, A first skeleton oil seal (26) is provided between the inner groove of the inner sleeve upper pressure cover (22) and the inner spacer (15) of the bearing; a second skeleton oil seal (44) is provided between the inner groove of the outer sleeve upper pressure cover (42) and the inner sleeve (30); a third skeleton oil seal (49) is provided between the inner groove of the outer sleeve lower pressure cover (48) and the outer bearing outer positioning sleeve (34); a fourth skeleton oil seal (62) is provided between the inner bearing positioning sleeve (16) and the sealing pressure cover (60).

9. The coaxial internal and external independent rotation structure according to claim 8, characterized in that, A first stop washer (70) is fitted on the main shaft (10) located on the upper side of the first rotating part (90), and a shaft cap (12) is threadedly connected to the main shaft (10) above the first stop washer (70); a second stop washer (72) is fitted on the inner sleeve (30) located on the lower side of the inner sleeve pulley (36), and a first nut (71) is threadedly connected to the inner sleeve (30) below the second stop washer (72); a third stop washer (74) is fitted on the main shaft (10) located on the lower side of the inner bearing positioning sleeve (16), and a second nut (73) is threadedly connected to the main shaft (10) below the third stop washer (74); a fourth stop washer (76) is fitted on the main shaft (10) located on the lower side of the main shaft pulley (14), and a third nut (75) is threadedly connected to the main shaft (10) below the fourth stop washer (76).

10. The coaxial internal and external independent rotation structure according to claim 9, characterized in that, The upper end of the main shaft (10) is provided with an axially extending first lubricating oil channel (81), and a first grease nipple (80) is installed at the port of the first lubricating oil channel (81); the outer sleeve (40) and the upper cover (42) of the outer sleeve located on the upper side of the inner cylindrical roller bearing (50) are provided with a radially extending second lubricating oil channel (83), and a second grease nipple (82) is installed at the port of the second lubricating oil channel (83); the outer sleeve (40) located between the inner cylindrical roller bearing (50) and the inner angular contact ball bearing (54) is provided with a radially extending third lubricating oil channel (85), and a third grease nipple (84) is installed at the port of the third lubricating oil channel (85); the lower end of the main shaft (10) is provided with an axially extending fourth lubricating oil channel (87), and a fourth grease nipple (86) is installed at the port of the fourth lubricating oil channel (87).

Images