Compact speed reducer
By using an oil-sealed bearing assembly to seal the lubricating grease in the speed reducer, the problem of lubricating grease leakage is solved, enabling a compact design of the speed reducer and extending the service life of the gears.
Patent Information
- Application Number
- CN202422868652.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-25
AI Technical Summary
The lubricating grease in existing speed reducers is prone to leakage, resulting in excessive axial length, which affects the size of the speed reducer and makes it unsuitable for various installation applications.
The oil-sealed bearing assembly, including an inner raceway, an outer raceway, and rollers, seals the lubricating grease, replacing the traditional RS bearing. It utilizes the lubricity of No. 0 grease and saves axial space.
It effectively prevents lubricating grease leakage, extends gear service life, reduces gear size, and is suitable for more installation applications.
Smart Images
Figure CN223498622U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of speed reducer technology, specifically a compact speed reducer. Background Technology
[0002] A speed reducer is an independent component consisting of gear transmission, worm gear transmission, or a combination of both, within a closed, rigid housing. It plays a role in matching speeds and transmitting torque between the prime mover and the driven machine or actuator, and is commonly used as a speed reduction transmission device between the prime mover and the driven machine.
[0003] In existing technology, the gearbox of a speed reducer contains lubricating oil to reduce friction between components and thus reduce workpiece wear. Since the axial ends of the power input shaft of the speed reducer need to be supported by bearings, during the high-speed rotation of the power input shaft relative to the power output shaft, oil seals are used to prevent the lubricating grease in the gearbox from leaking between the gearbox opening and the power input shaft. However, the axial length occupied by the above-mentioned prevention is relatively long, which affects the actual volume of the gearbox and cannot be widely used in different installation situations (due to the space limitation of the speed reducer, it is impossible to assemble the speed reducer), resulting in poor performance. Utility Model Content
[0004] The purpose of this invention is to provide a compact speed reducer that can prevent lubricating grease leakage while reducing the actual size of the speed reducer.
[0005] To achieve the above objectives, this utility model discloses a compact speed reducer, including a speed reducer housing. The speed reducer housing has a first opening for power connection to a power input shaft and a second opening for power connection to a power output shaft. The power output shaft is located inside the speed reducer housing on the side opposite to the power input shaft. A first support bearing is provided between one axial end of the power input shaft and the bottom of the speed reducer housing. A second support bearing is provided at the first opening. A speed reduction assembly is provided between the power output shaft and the power input shaft. An oil seal bearing assembly is provided on the power input shaft, located between the first and second support bearings. The oil seal bearing assembly is located near the first opening and can seal the lubricating grease inside the speed reducer housing.
[0006] When the power input shaft rotates, the relatively high-speed power input shaft drives the power output shaft to rotate at a relatively low speed through the reduction assembly. The first support bearing and oil seal bearing assembly can support the power input shaft, the second support bearing is used to support the connecting head of the power input shaft, and the oil seal bearing assembly isolates the lubricating grease in the gearbox.
[0007] This invention, by placing the oil seal bearing assembly on the side of the power input shaft near the first opening, effectively seals the lubricating grease inside the gearbox, preventing grease leakage. This allows it to replace the RS bearing and replace #1 grease with #2 grease, utilizing the better lubricity of #2 grease to extend the service life of the gears. Furthermore, it saves the axial space on the power input shaft required for installing the skeleton oil seal, resulting in a more compact overall structure of the gearbox. This invention offers the advantages of effectively sealing the lubricating grease inside the gearbox and saving axial space on the power input shaft.
[0008] Preferably, the oil seal bearing assembly includes an inner raceway ring for connection to the power input shaft, an outer raceway ring for connection to the inner wall of the gearbox, a roller disposed between the inner raceway ring and the outer raceway ring, and a first skeleton oil seal. The first skeleton oil seal is disposed at one axial end near the second support bearing, and the gearbox body has a step near the first opening that abuts against the outer raceway ring.
[0009] The first skeleton oil seal outer ring and the outer raceway ring are interference fit.
[0010] The first skeleton oil seal is located between the outer raceway and the inner raceway and at one axial end close to the second support bearing, thereby effectively sealing the lubricating grease in the gearbox and preventing grease leakage. Since the power input shaft rotates at a high speed, the oil seal does not need to rotate relative to the bearing or bushing, but only relative to the inner raceway, thereby reducing wear (the inner raceway has high hardness).
[0011] Preferably, a bushing is provided between the inner raceway ring and the outer circular surface of the power input shaft.
[0012] The outer and inner raceways are supported and positioned by using bushings to assemble the inner raceway with the power input shaft.
[0013] Preferably, the bushing has a stop at one end axially close to the second support bearing, and the stop abuts against the inner raceway ring.
[0014] By setting a stop on the bushing, the inner raceway of the oil seal bearing assembly abuts against the stop during assembly, ensuring that the axis of the oil seal bearing assembly coincides with the axis of the power input shaft, and facilitating the positioning of the bushing and the oil seal bearing assembly.
[0015] Preferably, a sealing ring is provided between the outer raceway ring and the inner wall of the gearbox.
[0016] The sealing effect of the oil seal bearing assembly is further improved by isolating the space between the outer raceway ring and the inner wall of the gearbox by the sealing ring on the outside of the outer raceway ring.
[0017] Preferably, the reduction assembly includes a meshing gear sleeved on the power output shaft, and the portion of the power input shaft located between the first support bearing and the oil seal bearing assembly is a meshing section, through which the power input shaft meshes with the meshing gear.
[0018] In this design, the diameter of the meshing gear is larger than the diameter of the meshing section on the power input shaft, thereby reducing the speed of the power output shaft during transmission and increasing the torque of the power output shaft.
[0019] Preferably, a third support bearing is provided between one axial end of the power output shaft and the bottom of the gearbox, and a fourth support bearing for supporting the other axial end of the power output shaft is provided at the second opening. A second skeleton oil seal is also provided at the second opening, and the second skeleton oil seal is located on the back side of the fourth support bearing relative to the third support bearing.
[0020] The power output shaft is supported by the fourth and third support bearings to ensure its stability and service life during rotation; the second skeleton oil seal is used to seal the lubricating grease in the direction of the power output shaft.
[0021] Preferably, the power output shaft and the meshing gear are connected by a key to ensure synchronous rotation between the meshing gear and the power output shaft and prevent slippage between them.
[0022] This invention can replace the 2RS bearing with an oil seal bearing assembly, ensuring the sealing effect of the lubricating grease in the gearbox and preventing grease leakage. This allows No. 1 grease to be replaced with No. 0 grease, which has better lubricity, thus extending the service life of the gears. It also saves the axial space on the power input shaft required by the skeleton oil seal, making the overall structure of the gearbox more compact. This invention has the advantages of extending the service life of the gears and making the overall structure of the gearbox more compact. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of one structure of the present utility model.
[0024] Figure 2 This is a cross-sectional structural diagram of the present invention.
[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0026] Figure 4 This is a schematic diagram of the deceleration assembly of this utility model.
[0027] In the diagram: 11. Gearbox housing; 12. First opening; 13. Power input shaft; 131. Meshing section; 14. First support bearing; 15. Oil seal bearing assembly; 151. Inner raceway ring; 152. Outer raceway ring; 153. Roller; 154. First skeleton oil seal; 155. Sealing ring; 16. Bushing; 161. Stop; 17. Second support bearing; 20. Power output shaft; 21. Third support bearing; 22. Fourth support bearing; 23. Meshing gear; 24. Second skeleton oil seal; 25. Key; 26. Second opening. Detailed Implementation
[0028] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.
[0029] Depend on Figure 1 As shown, this embodiment discloses a compact speed reducer, including a reduction gearbox 11. The reduction gearbox 11 has a first opening 12 for power connection to a power input shaft 13 and a second opening 26 for power connection to a power output shaft 20. The power output shaft 20 is located inside the reduction gearbox 11 on the side opposite to the power input shaft 13. Figure 2 As shown, a first support bearing 14 is provided between one axial end of the power input shaft 13 and the bottom of the reduction gearbox 11, and a second support bearing 17 is provided at the first opening 12. A reduction assembly is provided between the power output shaft 20 and the power input shaft 13. An oil seal bearing assembly 15 is provided on the power input shaft 13, located between the first support bearing 14 and the second support bearing 17. The oil seal bearing assembly 15 is located on the side closer to the first opening 12. Figure 3 As shown, the oil seal bearing assembly 15 includes an inner raceway 151 for connection with the power input shaft 13, an outer raceway 152 connected to the inner wall of the gearbox 11, a roller 153 disposed between the inner raceway 151 and the outer raceway 152, and a first skeleton oil seal 154. The first skeleton oil seal 154 is disposed at one axial end near the second support bearing 17. The gearbox 11 is provided with a step near the first opening 12 that abuts against the outer raceway 152. A bushing 16 is provided between the inner raceway 151 and the outer circular surface of the power input shaft 13. A stop 161 is provided at one axial end of the bushing 16 near the second support bearing 17. The stop 161 abuts against the inner raceway 151. A sealing ring 155 is provided between the outer raceway 152 and the inner wall of the gearbox 11.
[0030] Depend on Figure 4As shown, the reduction assembly includes a meshing gear 23 sleeved on the power output shaft 20. The portion of the power input shaft 13 located between the first support bearing 14 and the oil seal bearing assembly 15 is a meshing section 131. The power input shaft 13 meshes with the meshing gear 23 through the meshing section 131. The power output shaft 20 and the meshing gear 23 are connected by a key 25. A third support bearing 21 is provided between one axial end of the power output shaft 20 and the bottom of the reduction gearbox 11. A fourth support bearing 22 for supporting the other axial end of the power output shaft 20 is provided at the second opening 26. A second skeleton oil seal 24 is also provided at the second opening 26. The second skeleton oil seal 24 is located on the back side of the fourth support bearing 22 relative to the third support bearing 21.
[0031] When the power input shaft 13 rotates, the relatively high-speed power input shaft 13 drives the meshing gear 23 to rotate through the meshing section 131. The power input shaft 13 drives the inner raceway ring 151 to rotate synchronously through the bushing 16. The inner raceway ring 151 rotates relative to the outer raceway ring 152 and the first skeleton oil seal 154. The lip of the first skeleton oil seal 154 rotates relative to the inner raceway ring 151. The first skeleton oil seal 154 isolates the gap between the inner raceway ring 151 and the outer raceway ring 152, thereby preventing lubrication. Grease leaks from the gap between the inner raceway 151 and the outer raceway 152 and flows out from the first opening 12. At this time, since the diameter of the meshing gear 23 is larger than the diameter of the meshing section 131 of the power input shaft 13, the power output shaft 20 is driven to rotate at a relatively low speed, thereby achieving speed reduction and torque increase. The second skeleton oil seal 24 seals the gap between the second opening 26 and the power output shaft 20, thereby preventing the lubricating grease from flowing out from the second opening 26, thus sealing the lubricating grease inside the gearbox 11.
Claims
1. A compact speed reducer, comprising a reduction gearbox, wherein the reduction gearbox has a first opening for power connection of a power input shaft and a second opening for power connection of a power output shaft, the power output shaft being located on the side of the reduction gearbox opposite to the power input shaft, a first support bearing being provided between one axial end of the power input shaft and the bottom of the reduction gearbox, a second support bearing being provided at the first opening, and a speed reduction assembly being provided between the power output shaft and the power input shaft, characterized in that: The power input shaft is provided with an oil seal bearing assembly located between the first support bearing and the second support bearing. The oil seal bearing assembly is located on the side close to the first opening and can seal the lubricating oil in the gearbox.
2. A compact speed reducer according to claim 1, characterized in that: The oil seal bearing assembly includes an inner raceway ring for connection to the power input shaft, an outer raceway ring connected to the inner wall of the gearbox, a roller disposed between the inner raceway ring and the outer raceway ring, and a first skeleton oil seal. The first skeleton oil seal is disposed at one axial end near the second support bearing, and the gearbox body has a step near the first opening that abuts against the outer raceway ring.
3. A compact speed reducer according to claim 2, characterized in that: A bushing is provided between the inner raceway ring and the outer circular surface of the power input shaft.
4. A compact speed reducer according to claim 3, characterized in that: The bushing has a stop at one end near the second support bearing in the axial direction, and the stop abuts against the inner raceway ring.
5. A compact speed reducer according to claim 2, 3, or 4, characterized in that: A sealing ring is provided between the outer raceway ring and the inner wall of the gearbox.
6. A compact speed reducer according to claim 1, characterized in that: The reduction assembly includes a meshing gear sleeved on the power output shaft. The portion of the power input shaft located between the first support bearing and the oil seal bearing assembly is a meshing section, and the power input shaft meshes with the meshing gear through the meshing section.
7. A compact speed reducer according to claim 6, characterized in that: A third support bearing is provided between one axial end of the power output shaft and the bottom of the gearbox. A fourth support bearing for supporting the other axial end of the power output shaft is provided at the second opening. A second skeleton oil seal is also provided at the second opening. The second skeleton oil seal is located on the back side of the fourth support bearing relative to the third support bearing.
8. A compact speed reducer according to claim 6 or 7, characterized in that: The power output shaft and the meshing gear are connected by a key.