Harmonic speed reducer with oil storage ring

Abstract

The utility model discloses a harmonic speed reducer with an oil storage ring, and belongs to the technical field of harmonic speed reducers. The device comprises a wave generator, a flexible gear and a rigid gear assembly, the wave generator is installed in the flexible gear, the rigid gear assembly is arranged on the periphery of the flexible gear in a sleeving mode, a first cover body rotationally connected with the wave generator is installed on the rigid gear assembly, a first sealing piece is arranged between the first cover body and the wave generator, and a second sealing piece is arranged between the first cover body and the rigid gear assembly. An oil storage part is arranged in the harmonic speed reducer, the first sealing part and the oil storage part isolate the interior of the speed reducer to form an oil storage space, and the flexible bearing, the flexible gear outer teeth and the rigid gear inner teeth of the wave generator are located in the oil storage space. The flexible bearing, the flexible gear outer teeth and the rigid gear inner teeth can be fully lubricated, the lubricating effect is improved, and therefore the service life of the harmonic speed reducer is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of harmonic reducers, and in particular to a harmonic reducer with an oil storage ring. Background Art

[0002] A harmonic reducer is a reduction gear with a high reduction ratio, which mainly includes a rigid wheel, a flexible wheel and a wave generator. The rigid wheel is sleeved on the outer periphery of the flexible wheel, and the wave generator is assembled inside the flexible wheel. The flexible wheel will be pushed up by the outer periphery of the wave generator and become an ellipse. Based on this, when the wave generator is driven by the power source and starts to rotate, the rigid wheel and the flexible wheel can be fully engaged at the long axis of the wave generator, and will be completely disengaged at the short axis of the wave generator. Since there is a difference in the number of teeth between the rigid wheel and the flexible wheel, when the wave generator continues to rotate, this difference in the number of teeth can achieve the effect of a high reduction ratio, so that a high torque output can be generated.

[0003] Lubricating oil is added to the harmonic reducer case to reduce friction and wear: the lubricating oil can form a lubricating film between the inner teeth of the rigid wheel and the outer teeth of the flexible wheel, reducing the friction and wear between them, thereby extending the service life of the harmonic reducer; it can also reduce temperature rise: the fluidity and cooling performance of the lubricating oil can help take away the heat during the operation of the harmonic reducer, reduce temperature rise, and prevent damage or failure caused by overheating; the lubricating oil can effectively protect the components of the harmonic reducer, delay their wear and corrosion, and ensure its normal operation.

[0004] In the related art, patent publication number US7905326B2 discloses a lubrication method and a rotating table device for a reduction gear, which mainly allows lubricating oil to be injected into the oil supply hole of the flexible outer gear cup through the oil supply path of the rigid inner gear ring, so that the wave generator can obtain a lubricating effect. However, because the lubricating oil will flow to a lower position, when the amount of lubricating oil decreases, the relative internal bearings and couplings cannot be effectively lubricated, which reduces the life of the reducer. Utility Model Content

[0005] In order to improve the lubrication effect on the internal bearings of the harmonic reducer and the internal teeth of the rigid wheel and the external teeth of the flexible wheel, the present application provides a harmonic reducer with an oil storage ring.

[0006] The present application provides a harmonic reducer with an oil storage ring adopts the following technical solution:

[0007] A harmonic reducer with an oil storage ring comprises a wave generator, a flexible wheel and a rigid wheel assembly, wherein the wave generator is installed in the flexible wheel, the rigid wheel assembly is sleeved on the outer periphery of the flexible wheel, a first cover body rotatably connected to the wave generator is installed on the rigid wheel assembly, a first seal is arranged between the first cover body and the wave generator, an oil storage member is arranged inside the harmonic reducer, the first seal and the oil storage member isolate the interior of the reducer to form an oil storage space, and the flexible bearing of the wave generator, the external teeth of the flexible wheel and the internal teeth of the rigid wheel are located in the oil storage space.

[0008] By adopting the above technical solution, the flexible bearing, the outer teeth of the flexible wheel and the inner teeth of the rigid wheel are isolated in the oil storage space, the flow of lubricating oil is reduced, and the lubricating oil is concentrated in the oil storage space. Even when the amount of lubricating oil is small, the flexible bearing, the outer teeth of the flexible wheel and the inner teeth of the rigid wheel can be fully lubricated, thereby improving the lubrication effect, thereby increasing the life of the harmonic reducer, and at the same time, the amount of grease added inside the reducer can be reduced.

[0009] Optionally, the oil storage member includes a first oil storage ring and a second oil storage ring, the first oil storage ring is installed on the outer periphery of the wave generator, and the side of the first oil storage ring away from the wave generator is in sliding contact with the inner wall of the flexible wheel, and the second oil storage ring is installed on the rigid wheel assembly, and the side of the second oil storage ring away from the rigid wheel assembly is in sliding contact with the outer wall of the flexible wheel.

[0010] By adopting the above technical solution, the formation of the oil storage space can be guaranteed, and the mutual rotation between the flexible wheel and the wave generator can also be ensured.

[0011] Optionally, the first oil storage ring includes a first ring body and a first elastic bending portion arranged on a side of the first ring body away from the wave generator, and the first elastic bending portion is inclined toward the oil storage space.

[0012] By adopting the above technical solution, since the first elastic bending portion has elasticity, under the action of this elasticity, the side wall of the first elastic bending portion can always slide and abut against the inner wall of the flexible wheel to ensure the sealing effect.

[0013] Optionally, an oil separator ring is provided on the outer wall of the wave generator, the oil separator ring is located between the flexible bearing of the wave generator and the first oil storage ring, the first elastic bending portion is located between the oil separator ring and the first ring body, and the first elastic bending portion is in sliding contact with the inner wall of the flexible wheel.

[0014] By adopting the above technical solution, the oil separator ring can further bring the lubricating oil closer to the flexible bearing of the wave generator, further improving the utilization rate of the remaining oil. If the first elastic bending part and the inner wall of the flexible wheel are worn and produce debris, the generated debris can be accommodated between the oil separator ring and the first ring body, reducing the impact of the debris on the flexible bearing.

[0015] Optionally, the thickness of the first elastic bending portion gradually decreases toward the inner wall of the flexible wheel, and a line seal is formed between the first elastic bending portion and the inner wall of the flexible wheel.

[0016] By adopting the above technical solution, the first elastic bending part is easier to bend and easier to form a sealing effect with the flexible wheel. The line sealing method can reduce the wear between the first elastic bending part and the flexible wheel on the one hand, and improve the sealing effect on the other hand.

[0017] Optionally, the first oil storage ring includes a sleeve portion, and the sleeve portion is sleeved on the outer periphery of the wave generator.

[0018] By adopting the above technical solution, the first oil storage ring can be detachably installed on the wave generator, thereby improving the convenience of disassembly and assembly.

[0019] Optionally, a first mounting groove is opened on the outer periphery of the wave generator, the sleeve portion is embedded in the first mounting groove, and the surface of the sleeve portion away from the wave generator is flush with the outer periphery of the wave generator.

[0020] By adopting the above technical solution, the fixing effect of the first oil storage ring on the wave generator is improved, and at the same time, the possibility of debris entering the gap is reduced.

[0021] Optionally, the second oil storage ring includes a second ring body and a second elastic bending portion arranged on a side of the second ring body away from the rigid wheel assembly, the second elastic bending portion is inclined toward the oil storage space, and the side edge of the second elastic bending portion is in sliding contact with the outer wall of the flexible wheel.

[0022] By adopting the above technical solution, the sealing effect is improved.

[0023] Optionally, a first oil storage chamber is formed between the flexible wheel and the wave generator, a second oil storage chamber is formed between the flexible wheel and the rigid wheel assembly, a connecting chamber is opened on the inner side of the first cover body, and the first oil storage chamber, the connecting chamber and the second oil storage chamber are connected to form the oil storage space.

[0024] By adopting the above technical solution, the lubricating oil can flow in the oil storage space, so that the flexible bearing and the outer teeth of the flexible wheel and the inner teeth of the rigid wheel can be lubricated to the same extent, ensuring a good lubrication effect between them. At the same time, it also reduces the operation of adding lubricating oil at different positions separately.

[0025] Optionally, the rigid wheel assembly includes a rigid wheel, an assembly body and a second cover body, the rigid wheel is fixed to the first cover body and is movably connected to the flexible wheel, the assembly body includes an assembly inner ring and an assembly outer ring that are rotatably connected to each other, the assembly inner ring is fixed to the rigid wheel, the assembly outer ring is fixed to the flexible wheel and the second cover body, and the second cover body is rotatably connected to the wave generator.

[0026] By adopting the above technical solution, the flexible wheel does not rotate, while the rigid wheel and the assembled inner ring rotate, thereby achieving a higher reduction ratio.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Isolate the flexible bearing, the outer teeth of the flexible wheel and the inner teeth of the rigid wheel in the oil storage space to reduce the flow of lubricating oil and concentrate the lubricating oil in the oil storage space. Even when the amount of lubricating oil is small, the flexible bearing, the outer teeth of the flexible wheel and the inner teeth of the rigid wheel can be fully lubricated to improve the lubrication effect, thereby increasing the life of the harmonic reducer and reducing the amount of grease added inside the reducer.

[0029] 2. The oil separator ring can further bring the lubricating oil closer to the flexible bearing of the wave generator, further improving the utilization rate of the remaining oil. If the first elastic bending part and the inner wall of the flexible wheel are worn and produce debris, the generated debris can be accommodated between the oil separator ring and the first ring body, reducing the impact of the debris on the flexible bearing.

[0030] 3. The lubricating oil can flow in the oil storage space, so that the flexible bearing, the outer teeth of the flexible wheel and the inner teeth of the rigid wheel can be lubricated to the same extent, ensuring a good lubrication effect between them. At the same time, it also reduces the need to add lubricating oil at different locations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the harmonic reducer according to an embodiment of the present application.

[0032] Figure 2 yes Figure 1 Sectional view along line AA.

[0033] Description of reference numerals:

[0034] 10. Wave generator; 11. Hollow cam; 111. Oil separator ring; 12. Flexible bearing; 20. Flexwheel; 201. Flexwheel outer teeth; 30. Rigid wheel assembly; 31. Rigid wheel; 311. Rigid wheel inner teeth; 32. Assembly; 321. Assembly inner ring; 322. Assembly outer ring; 33. Second cover body; 40. First cover body; 50. First sealing member; 51. Second sealing member; 52. Third sealing member; 60. Oil storage member; 61. First oil storage ring; 611. Sleeve portion; 612. First ring body; 613. First elastic bending portion; 62. Second oil storage ring; 621. Second ring body; 622. Second elastic bending portion; 70. Oil storage space; 71. First oil storage cavity; 72. Second oil storage cavity; 73. Connecting cavity; 80. First rolling bearing; 81. Second rolling bearing. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-2 This application is described in further detail.

[0036] The embodiment of the present application discloses a harmonic reducer with an oil storage ring. Figure 1 and Figure 2 The harmonic reducer includes a wave generator 10 , a flexible wheel 20 and a rigid wheel assembly 30 .

[0037] In one embodiment, the wave generator 10 includes a hollow cam 11 and a flexible bearing 12. The hollow cam 11 can be connected to the input shaft, the flexible bearing 12 is installed on the outer periphery of the hollow cam 11, the flexible wheel 20 is installed on the outer periphery of the flexible bearing 12, and the rigid wheel assembly 30 is mounted on the outer periphery of the flexible wheel 20.

[0038] Among them, a first cover body 40 rotatably connected to the hollow cam 11 is installed on the rigid wheel assembly 30, a first seal 50 is arranged between the first cover body 40 and the hollow cam 11, an oil storage part 60 is arranged inside the harmonic reducer, the first seal 50 and the oil storage part 60 isolate the interior of the reducer to form an oil storage space 70, and the flexible bearing 12, the flexible wheel outer teeth 201 and the rigid wheel inner teeth 311 are located in the oil storage space 70.

[0039] Reference Figure 2, the rigid wheel assembly 30 includes a rigid wheel 31, an assembly 32 and a second cover 33, the rigid wheel 31 can be fixed to the first cover 40 by means of bolts, and the internal teeth 311 of the rigid wheel are meshed with the external teeth 201 of the flexible wheel, the assembly 32 includes an assembly inner ring 321 and an assembly outer ring 322, the assembly inner ring 321 and the assembly outer ring 322 can be rotatably connected by a roller bearing, the assembly inner ring 321, the rigid wheel 31 and the first cover 40 can be fixed by the same bolt, the assembly outer ring 322 and the flexible wheel 20 and the second cover 33 can be fixed by the same bolt, the second cover 33 is rotatably connected to the hollow cam 11, and a second sealing member 51 is provided between the second cover 33 and the hollow cam 11. In the present application, the flexible wheel 20 is fixed and the rigid wheel 31 is rotated to achieve a larger reduction ratio.

[0040] In this embodiment, a first oil storage chamber 71 is formed between the flexible wheel 20 and the hollow cam 11, a second oil storage chamber 72 is formed between the flexible wheel 20 and the rigid wheel 31, a connecting chamber 73 is provided on the inner side of the first cover body 40, and the first oil storage chamber 71, the connecting chamber 73 and the second oil storage chamber 72 are sequentially connected to form an oil storage space 70. The purpose of such a design is that the lubricating oil can flow in the oil storage space 70, so that the flexible bearing 12, the flexible wheel outer teeth 201 and the rigid wheel inner teeth 311 can be lubricated to the same extent, ensuring a good lubrication effect between them.

[0041] In one embodiment, the oil storage member 60 includes a first oil storage ring 61 and a second oil storage ring 62, and the first oil storage ring 61 includes a sleeve portion 611, a first ring body 612, and a first elastic bending portion 613 that are integrally formed and sequentially connected. In this embodiment, a first installation groove is provided on the outer wall of the hollow cam 11 along the annular direction, and the sleeve portion 611 is embedded in the first installation groove. The surface of the sleeve portion 611 away from the hollow cam 11 is flush with the outer peripheral surface of the hollow cam 11, so that the installation of the first oil storage ring 61 is more stable. In other embodiments, it is also possible to directly sleeve the sleeve portion 611 on the outer periphery of the hollow cam 11 without providing a groove on the outer wall of the hollow cam 11.

[0042] In this embodiment, the first ring body 612 and the first elastic bending portion 613 are arranged in a bowl shape, the first elastic bending portion 613 is inclined toward the oil storage space 70, and the thickness of the first elastic bending portion 613 gradually decreases toward the inner wall of the flexible wheel 20, and the side of the first elastic bending portion 613 is slidably abutted against the inner wall of the flexible wheel 20 to form a line seal.

[0043] At the same time, the outer wall of the hollow cam 11 is integrally formed with an oil separator ring 111, which is located between the flexible bearing 12 and the first oil storage ring 61, and the first elastic bending portion 613 is located between the oil separator ring 111 and the first ring body 612. The purpose of this design is that the oil separator ring 111 can further bring the lubricating oil closer to the flexible bearing 12, further improving the utilization rate of the remaining oil. If the first elastic bending portion 613 and the inner wall of the flexible wheel 20 are worn and debris is generated, the generated debris can be accommodated between the oil separator ring 111 and the first ring body 612, reducing the impact of the debris on the flexible bearing 12.

[0044] In one embodiment, the second oil storage ring 62 includes an integrally formed and mutually connected second ring body 621 and a second elastic bending portion 622, a second mounting groove is opened on the side wall of the assembly inner ring 321, the second ring body 621 is embedded in the second mounting groove, the second elastic bending portion 622 is arranged on the side of the second ring body 621 away from the assembly inner ring 321, the second elastic bending portion 622 is inclined toward the oil storage space 70, and the side edge of the second elastic bending portion 622 is slidably abutted against the outer wall of the flexible wheel 20 to form a line seal.

[0045] The first oil storage ring 61 and the second oil storage ring 62 may be made of plastic, metal, or other materials.

[0046] Therefore, the first seal 50, the first oil storage ring 61 and the second oil storage ring 62 can concentrate the lubricating oil between the flexible bearing 12 and the flexible wheel outer teeth 201 and the rigid wheel inner teeth 311, so that the flexible bearing 12 and the flexible wheel outer teeth 201 and the rigid wheel inner teeth 311 can be fully lubricated, thereby improving the service life of the reducer.

[0047] In one embodiment, a third seal 52 is further provided between the assembled inner ring 321 and the assembled outer ring 322. The first seal 50, the second seal 51 and the third seal 52 can all be rotary oil seals, which are used to reduce the risk of oil leakage in the reducer.

[0048] In addition, a first rolling bearing 80 is arranged between the first cover body 40 and the hollow cam 11, and a second rolling bearing 81 is arranged between the second cover body 33 and the hollow cam 11. The first rolling bearing 80 is located between the first seal 50 and the flexible bearing 12, and the second rolling bearing 81 is located between the second seal 51 and the first oil storage ring 61. The first rolling bearing 80 and the second rolling bearing 81 can improve the stability of the mutual rotation of the structure. At the same time, the position design of the first rolling bearing 80 and the second rolling bearing 81 can also further improve the sealing effect inside the reducer.

[0049] The implementation principle of a harmonic reducer with an oil storage ring in an embodiment of the present application is as follows: the present application isolates the flexible bearing 12, the flexible wheel outer teeth 201, and the rigid wheel inner teeth 311 in the oil storage space 70, reduces the flow of lubricating oil, and concentrates the lubricating oil in the oil storage space 70. Even when the amount of lubricating oil is small, the flexible bearing 12, the flexible wheel outer teeth 201, and the rigid wheel inner teeth 311 can be fully lubricated, thereby improving the lubrication effect, thereby increasing the life of the harmonic reducer, and at the same time can reduce the amount of grease added inside the reducer.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A harmonic reducer with an oil storage ring, characterized in that: The invention comprises a wave generator (10), a flexspline (20) and a rigid wheel assembly (30), wherein the wave generator (10) is installed in the flexspline (20), the rigid wheel assembly (30) is sleeved on the outer periphery of the flexspline (20), a first cover body (40) rotatably connected to the wave generator (10) is installed on the rigid wheel assembly (30), a first sealing member (50) is arranged between the first cover body (40) and the wave generator (10), an oil storage member (60) is arranged inside the harmonic reducer, the first sealing member (50) and the oil storage member (60) isolate the interior of the reducer to form an oil storage space (70), and the flexible bearing (12) of the wave generator (10), the flexspline outer teeth (201) and the rigid wheel inner teeth (311) are located in the oil storage space (70).

2. The harmonic reducer with oil storage ring according to claim 1, characterized in that: The oil storage member (60) comprises a first oil storage ring (61) and a second oil storage ring (62). The first oil storage ring (61) is mounted on the outer periphery of the wave generator (10), and a side of the first oil storage ring (61) away from the wave generator (10) is in sliding contact with an inner wall of the flexible wheel (20). The second oil storage ring (62) is mounted on the rigid wheel assembly (30), and a side of the second oil storage ring (62) away from the rigid wheel assembly (30) is in sliding contact with an outer wall of the flexible wheel (20).

3. The harmonic reducer with oil storage ring according to claim 2, characterized in that: The first oil storage ring (61) comprises a first ring body (612) and a first elastic bent portion (613) arranged on a side of the first ring body (612) away from the wave generator (10), the first elastic bent portion (613) being inclined toward the oil storage space (70).

4. The harmonic reducer with oil storage ring according to claim 3, characterized in that: An oil separator ring (111) is provided on the outer wall of the wave generator (10); the oil separator ring (111) is located between the flexible bearing (12) of the wave generator (10) and the first oil storage ring (61); the first elastic bending portion (613) is located between the oil separator ring (111) and the first ring body (612); the first elastic bending portion (613) is in sliding contact with the inner wall of the flexible wheel (20).

5. The harmonic reducer with oil storage ring according to claim 3, characterized in that: The thickness of the first elastic bent portion (613) gradually decreases towards the inner wall of the flexible wheel (20), and a line seal is formed between the first elastic bent portion (613) and the inner wall of the flexible wheel (20).

6. The harmonic reducer with oil storage ring according to any one of claims 2 to 5, characterized in that: The first oil storage ring (61) comprises a sleeve portion (611), and the sleeve portion (611) is sleeved on the outer circumference of the wave generator (10).

7. The harmonic reducer with oil storage ring according to claim 6, characterized in that: The wave generator (10) is provided with a first mounting groove on its outer periphery, the sleeve portion (611) is embedded in the first mounting groove, and a surface of the sleeve portion (611) away from the wave generator (10) is flush with the outer periphery of the wave generator (10).

8. The harmonic reducer with oil storage ring according to claim 2, characterized in that: The second oil storage ring (62) comprises a second ring body (621) and a second elastic bent portion (622) arranged on a side of the second ring body (621) away from the rigid wheel assembly (30), the second elastic bent portion (622) being inclined toward the oil storage space (70), and a side edge of the second elastic bent portion (622) being in sliding contact with an outer wall of the flexible wheel (20).

9. The harmonic reducer with oil storage ring according to claim 1, characterized in that: A first oil storage chamber (71) is formed between the flexible wheel (20) and the wave generator (10), a second oil storage chamber (72) is formed between the flexible wheel (20) and the rigid wheel assembly (30), a connecting chamber (73) is provided on the inner side of the first cover body (40), and the first oil storage chamber (71), the connecting chamber (73) and the second oil storage chamber (72) are connected to form the oil storage space (70).

10. The harmonic reducer with oil storage ring according to claim 1, characterized in that: The rigid wheel assembly (30) comprises a rigid wheel (31), an assembly (32) and a second cover (33); the rigid wheel (31) is fixed to the first cover (40) and is movably connected to the flexible wheel (20); the assembly (32) comprises an assembly inner ring (321) and an assembly outer ring (322) which are rotatably connected to each other; the assembly inner ring (321) is fixed to the rigid wheel (31); the assembly outer ring (322) is fixed to the flexible wheel (20) and the second cover (33); and the second cover (33) is rotatably connected to the wave generator (10).

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