Helical gear for improving NVH performance of gearbox
By designing a separately replaceable helical gear ring and an optimized lubricant system helical gear structure, the problems of reduced accuracy and high replacement cost after wear in the prior art are solved, and lower replacement cost and higher wear resistance and noise control are achieved.
Patent Information
- Application Number
- CN202422158594.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-09-03
AI Technical Summary
The accuracy of existing helical gears decreases after wear, resulting in increased impact and noise during transmission, and the wear area cannot be replaced separately, which requires overall replacement, which increases the replacement cost.
A helical gear structure including a limiting ring and a helical toothed ring is designed, through the design of fixing bolts and outer rings, allowing for separate replacement of the helical toothed rings, and optimizing the addition and distribution of lubricant oil through displacement columns and lubricant oil systems.
It can be replaced separately after the helical ring wears, reducing replacement costs, and reducing the waste of lubricant oil by optimizing the lubricant oil system, improving the wear resistance of the helical gear and controlling the operating noise.
Smart Images
Figure CN222910698U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of helical gears, and particularly relates to a helical gear for improving the NVH performance of a gearbox. Background Art
[0002] The NVH level of a gearbox, that is, the noise, vibration, and harshness levels of the gearbox, is one of the important indicators for measuring the performance of an automotive gearbox.
[0003] In the prior art, helical gears have the advantages of small size, light weight, large torque transmission, smooth starting, low working noise, and fine grading of transmission ratios. They are commonly used mechanical transmission parts in the reduction motor gearbox. However, most existing helical gears are of an integrally formed structure. Since there will be friction between the teeth during meshing, once the teeth of the helical gear are worn, its accuracy will be reduced, which will further increase the impact and noise during the transmission process. Therefore, it is necessary to replace the helical gear after wear. However, when replacing the existing helical gear, the whole needs to be replaced, and the worn area cannot be replaced separately. In view of this, we have proposed a helical gear for improving the NVH performance of a gearbox. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a helical gear for improving the NVH performance of a gearbox, so as to solve the problems raised in the above background art.
[0005] To achieve the above purpose, the utility model provides the following technical solution: A helical gear for improving the NVH performance of a gearbox includes a limiting convex ring. An outer surface of the limiting convex ring is provided with a helical tooth ring. A keyway is opened on an inner wall of the limiting convex ring. Outer rings are respectively fixedly connected to front and rear surfaces of the limiting convex ring. A second keyway is opened on an inner wall of the outer ring. A clamping groove is opened on an inner wall of the helical tooth ring. A clamping block is opened on an outer surface of the outer ring. The clamping block is adapted to the clamping groove. Grooves are respectively opened on opposite side surfaces of the two outer rings. First threaded holes are respectively opened on inner walls of the two grooves close to each other. The first threaded holes extend out of side surfaces of the two outer rings close to each other. Second threaded holes are opened on front and rear surfaces of the limiting convex ring. The second threaded holes communicate with the first threaded holes. A fixing bolt is threadedly sleeved in the second threaded holes and the first threaded holes.
[0006] Preferably, helical teeth are fixedly connected to an outer surface of the helical tooth ring. A tooth groove is arranged between two adjacent helical teeth. An annular cavity is opened inside the helical tooth ring. An oil injection port extending into the annular cavity is opened on a front surface of the helical tooth ring.
[0007] Preferably, a sealing plug is arranged inside the oil injection port. A second groove is opened on an inner wall of the annular cavity.
[0008] Preferably, a through slot extending into the second groove is formed on the bottom wall of the tooth slot, and a displacement column is slidably connected to the interior of the through slot.
[0009] Preferably, a second through groove is formed on the outer surface of the displacement column, and one end of the displacement column slides and extends into the interior of the annular cavity.
[0010] Preferably, one end of the displacement column located inside the annular cavity is fixedly connected to a limiting disk.
[0011] Preferably, a spring is fixedly connected to the upper surface of the limiting plate, and the upper end of the spring is fixedly connected to the inner wall of the second groove.
[0012] Preferably, a buffer ring is fixedly connected to the upper surface of the limiting plate, and the outer surface of the helical teeth is coated with a tungsten carbide coating.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] (1) The helical gear for improving the NVH performance of the gearbox can be replaced by removing the fixing bolts when the helical gear ring needs to be replaced. After the fixing bolts are removed, the outer ring is unlocked. After the outer ring is unlocked, the outer ring is removed. At this time, the outer ring drives the clamping block to disengage from the inside of the clamping groove. Then, the helical gear ring can be removed as a whole for replacement. The replaced helical gear ring is sleeved inside the limiting convex ring. Then, the two outer rings are respectively placed on the front and rear side surfaces of the limiting convex ring, and the clamping block is aligned with the clamping groove and inserted. At this time, the outer ring and the limiting convex ring can be fixed with the fixing bolts. Through the above structure, when the helical gear ring is worn and the noise of the gearbox increases, the helical gear can be repaired by replacing the helical gear ring alone, thereby reducing the replacement cost compared with the overall replacement of the traditional structure.
[0015] (2) The helical gear for improving the NVH performance of the gearbox, the helical gear continues to rotate to drive the helical teeth out of the tooth groove. At this time, the displacement column has no obstruction, and the displacement column is reset under the action of the spring. When the displacement column rises, a small amount of lubricating oil is brought into the interior of the tooth groove by using the second through groove. At the same time, the buffer ring is used to prevent the limit plate from directly contacting the inner wall of the annular cavity when the spring contracts. The wear resistance of the helical teeth can be improved by using the tungsten carbide coating coated on the helical teeth. Through the above structure, it is possible to avoid dripping lubricating oil on the helical gear externally when adding lubricating oil, avoiding the situation where the filling amount is difficult to control and the lubricating oil is added too much, thereby causing a waste of lubricating oil. The helical teeth can be protected by the tungsten carbide coating on the helical teeth, avoiding the problem of increased operating noise caused by the decrease in surface finish of the helical teeth due to friction. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention is further described below with reference to the accompanying drawings and embodiments:
[0017] Figure 1 Schematic diagram of the structure of a helical gear for improving the NVH performance of the utility model
[0018] Figure 2 Schematic diagram of the outer ring separation of the utility model
[0019] Figure 3 Schematic cross-sectional view of the annular cavity of the utility model
[0020] Figure 4 is Figure 3 Enlarged view of part A in
[0021] Reference numerals: 1, limiting convex ring; 2, helical gear ring; 3, keyway; 4, outer ring; 5, second keyway; 6, card slot; 7, clamping block; 8, groove; 9, first threaded hole; 10, second threaded hole; 11, helical tooth; 12, tooth groove; 13, annular cavity; 14, oil injection port; 15, second groove; 16, displacement column; 17, second through groove; 18, limiting disc; 19, spring; 20, buffer ring Detailed implementation manners
[0022] This part will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model
[0023] Please refer to Figures 1-4, the present utility model provides a technical solution: a helical gear for improving the NVH performance of a gearbox, including a limit convex ring 1. An outer surface of the limit convex ring 1 is provided with a helical tooth ring 2. A keyway 3 is opened on an inner wall of the limit convex ring 1. Front and rear side surfaces of the limit convex ring 1 are respectively fixedly connected with outer rings 4. A second keyway 5 is opened on an inner wall of the outer ring 4. A clamping groove 6 is opened on an inner wall of the helical tooth ring 2. A clamping block 7 is opened on an outer surface of the outer ring 4. The clamping block 7 is adapted to the clamping groove 6. Grooves 8 are respectively opened on opposite side surfaces of the two outer rings 4. First threaded holes 9 are respectively opened on inner walls of the two grooves 8 close to each other. The first threaded holes 9 extend out of side surfaces of the two outer rings 4 close to each other. Second threaded holes 10 are opened on front and rear side surfaces of the limit convex ring 1. The second threaded holes 10 communicate with the first threaded holes 9. Fixing bolts are threadedly sleeved in the second threaded holes 10 and the first threaded holes 9. This gearbox is used for large machinery. Therefore, the overall helical gear inside is relatively large and rotates at a slow speed. Thus, the components in this application can be set. When it is necessary to replace the helical tooth ring 2, the fixing bolts can be removed. After the fixing bolts are removed, the unlocking of the outer ring 4 is completed. After the outer ring 4 is unlocked, the outer ring 4 is removed. At this time, the outer ring 4 drives the clamping block 7 to disengage from the inside of the clamping groove 6. Subsequently, the entire helical tooth ring 2 can be removed for replacement. The replaced helical tooth ring 2 is sleeved inside the limit convex ring 1. Subsequently, the two outer rings 4 are respectively placed on front and rear side surfaces of the limit convex ring 1, and the clamping block 7 is aligned with the clamping groove 6 and snapped in. At this time, the outer ring 4 and the limit convex ring 1 are fixed by means of the fixing bolts. Through the above structure, when the helical tooth ring 2 is worn and the noise of the gearbox rises, the helical gear can be repaired by separately replacing the helical tooth ring 2, reducing the replacement cost compared with the overall replacement of the traditional structure.
[0024] Further, the outer surface of the helical gear ring 2 is fixedly connected with helical teeth 11. There is a tooth groove 12 between two adjacent helical teeth 11. An annular cavity 13 is formed inside the helical gear ring 2. An oil injection port 14 extending into the annular cavity 13 is formed on the front surface of the helical gear ring 2. A sealing plug is arranged inside the oil injection port 14. A second groove 15 is formed on the inner wall of the annular cavity 13. A through groove extending into the second groove 15 is formed on the bottom wall of the tooth groove 12. A displacement column 16 is slidably connected inside the through groove. A second through groove 17 is formed on the outer surface of the displacement column 16. One end of the displacement column 16 slidably extends into the annular cavity 13. A limiting disc 18 is fixedly connected to the end of the displacement column 16 located inside the annular cavity 13. A spring 19 is fixedly connected to the upper surface of the limiting disc 18. The upper end of the spring 19 is fixedly connected to the inner wall of the second groove 15. A buffer ring 20 is fixedly connected to the upper surface of the limiting disc 18. A tungsten carbide coating is coated on the outer surface of the helical tooth 11. This helical gear is located below the gear meshing with it. When lubricating oil needs to be added to protect the helical teeth 11 after the helical gear ring is installed, the lubricating oil is filled into the annular cavity 13 through the oil injection port 14. Then, the helical gear is slowly rotated. When the helical teeth 11 on another helical gear enter the tooth groove 12, they will contact the displacement column 16 and drive the displacement column 16 to move into the annular cavity 13 by means of the helical teeth 11. When the displacement column 16 moves, it will synchronously stretch the spring 19. At the same time, when the displacement column 16 moves, it will also synchronously drive the limiting disc 18 to move. After the displacement column 16 moves, it drives the second through groove 17 into the annular cavity 13. When the second through groove 17 enters the annular cavity 13, the lubricating oil enters the second through groove 17. At this time, the helical gear continues to rotate to drive the helical teeth 11 out of the tooth groove 12. At this time, the displacement column 16 lacks obstruction and drives the displacement column 16 to reset under the action of the spring 19. When the displacement column 16 rises, a small amount of lubricating oil is brought into the tooth groove 12 by using the second through groove 17. At the same time, the buffer ring 20 is used to prevent the limiting disc 18 from directly contacting the inner wall of the annular cavity 13 when the spring 19 contracts. And the wear resistance of the helical teeth 11 can be improved by means of the tungsten carbide coating coated on the helical teeth 11. Through the above structure, it is possible to avoid dripping lubricating oil on the helical gear externally when filling the lubricating oil, prevent excessive lubricating oil filling caused by inconvenient control of the filling amount, thus avoiding the waste of lubricating oil. And the helical teeth 11 can be protected by the tungsten carbide coating on the helical teeth 11, avoiding the problem of increased running noise caused by the decrease in surface finish of the helical teeth 11 due to friction.
[0025] Working principle: When it is necessary to replace the helical gear ring 2, the fixing bolts can be removed. After the fixing bolts are removed, the unlocking of the outer ring 4 is completed. After the outer ring 4 is unlocked, the outer ring 4 is removed. At this time, the outer ring 4 drives the clamping block 7 to disengage from the inside of the clamping groove 6. Subsequently, the entire helical gear ring 2 can be removed for replacement. The replaced helical gear ring 2 is sleeved inside the limit convex ring 1. Then, the two outer rings 4 are respectively placed on the front and rear surfaces of the limit convex ring 1, and the clamping block 7 is aligned with the clamping groove 6 and snapped in. At this time, the outer ring 4 and the limit convex ring 1 are fixed by means of the fixing bolts. When lubricating oil needs to be added to protect the helical teeth 11 after the helical gear ring is installed, the lubricating oil is filled into the inside of the annular cavity 13 through the oil injection port 14. Then, the helical gear is slowly rotated. When the helical teeth 11 on the other helical gear enter the inside of the tooth groove 12, they will contact the displacement column 16, and the displacement column 16 is driven to move into the inside of the annular cavity 13 by means of the helical teeth 11. When the displacement column 16 moves, the spring 19 will be stretched synchronously. At the same time, when the displacement column 16 moves, the limit disk 18 will also be driven to move synchronously. After the displacement column 16 moves, the second through groove 17 enters the inside of the annular cavity 13. When the second through groove 17 enters the inside of the annular cavity 13, the lubricating oil enters the inside of the second through groove 17. At this time, the helical gear continues to rotate to drive the helical teeth 11 to disengage from the tooth groove 12. At this time, the displacement column 16 lacks obstruction, and under the action of the spring 19, the displacement column 16 is driven to reset. When the displacement column 16 rises, a small amount of lubricating oil is brought into the inside of the tooth groove 12 by means of the second through groove 17. At the same time, the buffer ring 20 is used to prevent the limit disk 18 from directly contacting the inner wall of the annular cavity 13 when the spring 19 contracts, and the wear resistance of the helical teeth 11 can be improved by means of the tungsten carbide coating coated on the helical teeth 11.
[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field, various changes can be made without departing from the purpose of the present invention.
Claims
1. A helical gear for improving the NVH performance of a gearbox, comprising a limiting convex ring (1), characterized in that: The outer surface of the limiting convex ring (1) is provided with a helical toothed ring (2), the inner wall of the limiting convex ring (1) is provided with a keyway (3), the front and rear side surfaces of the limiting convex ring (1) are respectively fixedly connected with an outer ring (4), the inner wall of the outer ring (4) is provided with a second keyway (5), the inner wall of the helical toothed ring (2) is provided with a clamping groove (6), the outer surface of the outer ring (4) is provided with a clamping block (7), the clamping block (7) is adapted to the clamping groove (6), the surfaces of the two outer rings (4) on opposite sides are respectively provided with grooves (8), the inner walls of the sides adjacent to the two grooves (8) are respectively provided with first threaded holes (9), the first threaded holes (9) extend out of the sides adjacent to the two outer rings (4), the front and rear side surfaces of the limiting convex ring (1) are provided with second threaded holes (10), the second threaded holes (10) are communicated with the first threaded holes (9), and the internal threads of the second threaded holes (10) and the first threaded holes (9) are provided with fixing bolts.
2. A helical gear for improving the NVH performance of a gearbox according to claim 1, characterized in that: The outer surface of the helical gear ring (2) is fixedly connected with helical teeth (11), a tooth groove (12) is provided between two adjacent helical teeth (11), an annular cavity (13) is provided inside the helical gear ring (2), and an oil filling port (14) extending into the annular cavity (13) is provided on the front side surface of the helical gear ring (2).
3. A helical gear for improving the NVH performance of a gearbox according to claim 2, characterized in that: A sealing plug is provided inside the oil filling port (14), and a second groove (15) is provided on the inner wall of the annular cavity (13).
4. A helical gear for improving the NVH performance of a gearbox according to claim 2, characterized in that: The bottom wall of the tooth groove (12) is provided with a through groove extending into the interior of the second groove (15), and a displacement column (16) is slidably connected to the interior of the through groove.
5. A helical gear for improving the NVH performance of a gearbox according to claim 4, characterized in that: A second through groove (17) is formed on the outer surface of the displacement column (16), and one end of the displacement column (16) slides and extends into the interior of the annular cavity (13).
6. A helical gear for improving the NVH performance of a gearbox according to claim 5, characterized in that: One end of the displacement column (16) located inside the annular cavity (13) is fixedly connected to a limiting disk (18).
7. A helical gear for improving the NVH performance of a gearbox according to claim 6, characterized in that: A spring (19) is fixedly connected to the upper surface of the limiting plate (18), and the upper end of the spring (19) is fixedly connected to the inner wall of the second groove (15).
8. The helical gear for improving the NVH performance of a gearbox according to claim 7, characterized in that: A buffer ring (20) is fixedly connected to the upper surface of the limiting plate (18), and the outer surface of the helical teeth (11) is coated with a tungsten carbide coating.