Novel high-performance RV speed reducer

Abstract

The utility model provides a novel high-performance RV speed reducer, which relates to the technical field of speed reduction equipment, and comprises a pin wheel housing, an output shaft, an output end cover, a plurality of roller pins, two cycloidal gears and 4-9 eccentric shafts, and angular contact roller bearings are arranged among the output shaft, the output end cover and the pin wheel housing. The cycloidal gears are respectively arranged on the two cams of the eccentric shaft, and a first roller pin and a retainer bearing are arranged between the cycloidal gears; mounting holes which penetrate through the output shaft and the output end cover in the thickness direction and correspond to the eccentric shaft are formed in the output shaft and the output end cover, second roller pins and retainer bearings are arranged between the true circles of the two ends of the eccentric shaft and the inner walls of the two mounting holes respectively, and limiting structures are arranged at the two ends of the eccentric shaft respectively; the output shaft is provided with a central stand coaxial with the output shaft and a plurality of connecting stands arranged around the axis of the output shaft in an array mode, and the central stand and the connecting stands penetrate through the two cycloidal gears and are connected with the output end cover through connecting pins and connecting screws. According to the utility model, the power density can be maximized, the performance of each component is matched with the overall performance, and higher use requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of speed reduction equipment technology, and in particular to a novel high-performance RV speed reducer. Background Technology

[0002] The RV reducer is a new type of reducer developed on the basis of cycloidal pinwheel transmission. It includes a first-stage planetary reduction structure and a second-stage cycloidal pinwheel reduction structure. It has the advantages of high rigidity, high precision, large torque and high transmission efficiency. Compared with simple cycloidal pinwheel planetary transmission, it has a smaller size and greater overload capacity.

[0003] However, traditional RV reducers still have the problem of insufficient structural compactness. When limited by installation space, their torque and torsional stiffness are relatively weak, which makes it difficult for the power density of RV reducers to meet the needs of use under extreme conditions. Moreover, the performance of RV reducers depends on the weakest part of their structure. Even if some structural capabilities are improved, it cannot be guaranteed that their performance will reach its best. Utility Model Content

[0004] The purpose of this invention is to provide a new type of high-performance RV reducer that can maximize power density, match the performance of each component with the overall performance, and meet higher usage requirements.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A novel high-performance RV reducer includes a pin gear housing, an output shaft, an output end cover, two cycloidal wheels, and 4-9 eccentric shafts arranged in a circumferential array, all installed within the inner hole of the pin gear housing. Angular contact roller bearings are respectively provided between the outer wall of the output shaft and the outer wall of the output end cover and the inner hole of the pin gear housing. The two cycloidal wheels are respectively mounted on two cams of the eccentric shafts, with a first needle roller and cage bearing provided between them. The outer walls of the two cycloidal wheels and the inner hole of the pin gear housing are engaged by needle rollers, and the needle rollers are located between the two angular contact roller bearings.

[0007] The output shaft and output end cover are provided with mounting holes that penetrate their thickness direction and correspond to several eccentric shafts. Second needle roller and cage bearings are respectively provided between the true circles at both ends of the eccentric shaft and the inner walls of the corresponding mounting holes on the output shaft and output end cover. Two first needle roller and cage bearings and two second needle roller and cage bearings are sequentially and intermittently connected along the axial direction of the eccentric shaft. The two ends of the eccentric shaft are respectively provided with limiting structures that axially limit the two ends of the eccentric shaft and the two second needle roller and cage bearings at one end away from each other.

[0008] The output shaft is provided with a central column coaxial with it and several connecting columns arranged in an array around its axis on the side near the output end cover. The central column and connecting columns pass through two cycloidal wheels and are connected to the output end cover by connecting pins and connecting screws.

[0009] A planetary gear is mounted on the end of the eccentric shaft near the output end cover. An input shaft extending away from the central column is mounted on the end face of the output end cover away from the output shaft via a deep groove ball bearing. An input gear that meshes with the planetary gear is mounted on the input shaft.

[0010] By adopting the above technical solution, mounting holes penetrating the thickness direction are provided on the output shaft and output end cover for mounting the eccentric shaft. A second needle roller and cage bearing without inner and outer rings is set between the two mounting holes and the true circles at both ends of the eccentric shaft. The limiting structure axially limits the eccentric shaft and the second needle roller and cage bearing. In this way, with the volume unchanged, almost the entire axial length of the reducer is utilized by the first needle roller and cage bearing and the second needle roller and cage bearing. The length of the first needle roller and cage bearing, the length of the second needle roller and cage bearing, the axial thickness of the cycloidal wheel, the length of the needle rollers between the cycloidal wheel and the needle tooth housing, and the center distance between the two angular contact roller bearings are all increased and can be optimized to the best matching length. The contact area of ​​the first needle roller and cage bearing, the second needle roller and cage bearing, and the needle rollers and the raceway is increased, the contact stress is reduced, the service life is increased, and the torque capacity is increased. Furthermore, the second needle roller and cage bearing replaces the original tapered roller bearing and eliminates the inner and outer rings, maximizing the true circular outer diameter at both ends of the eccentric shaft. This significantly improves its rigidity and load-bearing capacity. The number of rollers in the second needle roller and cage bearing is also maximized, thus greatly enhancing its performance. In addition, the number of eccentric shafts is 4-9, effectively improving its load-transfer capacity. Under this premise, the output shaft and output end cover are connected by a central column and several connecting columns, preventing the increase in the number of eccentric shafts from reducing the number and diameter of the connecting columns and affecting the connection strength between the output shaft and output end cover. In summary, the capabilities of each component in this invention are simultaneously improved, maximizing power density, and the performance of each component matches the overall performance, meeting higher usage requirements.

[0011] Furthermore, the limiting structure includes a left pressure plate mounted on the end face of the output shaft away from the output end cover by screws, a left baffle plate provided between the end of the second needle roller and cage bearing corresponding to the output shaft away from the first needle roller and cage bearing and the left pressure plate, and a left thrust bearing provided between the end of the true circle on the eccentric shaft corresponding to the output shaft away from the first needle roller and cage bearing and the left pressure plate.

[0012] By adopting the above technical solution, the left pressure plate and left thrust bearing are used to axially limit the end of the eccentric shaft near the output shaft. The left thrust bearing reduces wear on the end of the eccentric shaft and improves transmission efficiency. The left pressure plate and left baffle are used to axially limit the end of the second needle roller and cage bearing corresponding to the output shaft away from the first needle roller and cage bearing, avoiding interference between the second needle roller and cage bearing and the left thrust bearing, which would affect its normal operation.

[0013] Furthermore, the limiting structure also includes a right baffle that is mounted on the end face of the output end cover away from the output shaft by screws. The right baffle and the second needle roller corresponding to the output end cover are in clearance contact with the end of the cage bearing away from the first needle roller and the cage bearing, and the right baffle is located between the output end cover and the planetary gear.

[0014] By adopting the above technical solution, the right baffle is used to axially limit the end of the second needle roller and cage bearing corresponding to the output end cover away from the first needle roller and cage bearing. In this way, the left baffle and the left pressure plate can axially limit the two first needle roller and cage bearings and the two second needle roller and cage bearings from both ends. The two first needle roller and cage bearings and the two second needle roller and cage bearings are sequentially and intermittently connected along the eccentric shaft, allowing a certain gap of axial movement to ensure the normal operation of the first needle roller and cage bearings and the second needle roller and cage bearings.

[0015] Furthermore, the limiting structure also includes a right pressure plate with an eccentric shaft located away from the output shaft. The right pressure plate is mounted on the end face of the output end cover away from the output shaft by screws, and a right thrust bearing is provided between it and the planetary gear.

[0016] By adopting the above technical solution, the right pressure plate and the right thrust bearing are used to achieve axial limiting of the eccentric shaft near the output end cover. The right thrust bearing can reduce the wear on the end of the eccentric shaft and the planetary gears, improve the transmission efficiency, and avoid interference between the right pressure plate and the planetary gears.

[0017] Furthermore, a shaft elastic retaining ring is provided on the side of the planetary gear away from the right thrust bearing, which is mounted on the eccentric shaft and located between the right baffle and the planetary gear, and a gasket is provided between the shaft elastic retaining ring and the planetary gear.

[0018] By adopting the above technical solution, using universal elastic retaining rings and washers, in conjunction with the right thrust bearing and the right retaining plate, the axial positioning of the planetary gears can be achieved, and the short length of the spline connecting teeth between the end of the eccentric shaft and the planetary gears can be avoided, which makes it difficult to process.

[0019] Furthermore, the inner rings of the two angular contact roller bearings and the corresponding output shaft and output end cap are integrated into one unit.

[0020] By adopting the above technical solution, the inner ring of the angular contact roller bearing, the corresponding output shaft, and the output end cover are integrated. This not only improves the rigidity and precision of the angular contact roller bearing, but also increases the inner diameter of the mounting hole by increasing the wall thickness of the output shaft and the output end cover. In other words, the true outer diameter of the second needle roller and cage bearing installed at both ends of the eccentric shaft can be further increased, further increasing the rigidity and load-bearing capacity. The number of rollers in the second needle roller and cage bearing is also further increased, further enhancing its capacity.

[0021] Furthermore, a skeleton seal is provided between the inner hole of the needle housing and the outer wall of the output shaft, and the skeleton seal is located on the side of the corresponding angular contact roller bearing away from the needle roller.

[0022] By adopting the above technical solution, the skeleton seal ring is used to achieve the seal between the needle housing and the output shaft, and the skeleton seal is avoided from occupying the installation space of the angular contact roller bearing, so as to ensure that the center distance between the two angular contact roller bearings is matched with the length of the needle roller, and thus ensure its performance.

[0023] In summary, this utility model has the following beneficial effects:

[0024] 1. In this utility model, mounting holes penetrating the thickness direction are provided on the output shaft and output end cover for mounting the eccentric shaft. A second needle roller and cage bearing without inner and outer rings is set between the two mounting holes and the true circles at both ends of the eccentric shaft. In this way, the outer diameter of the true circles at both ends of the eccentric shaft is maximized without changing the volume, and its rigidity and load-bearing capacity are greatly improved. The number of rollers in the second needle roller and cage bearing is also maximized, thereby greatly improving the capacity of the second needle roller and cage bearing. In addition, almost the entire axial length of the reducer is utilized by the first needle roller and cage bearing and the second needle roller and cage bearing. The length of the first needle roller and cage bearing, the length of the second needle roller and cage bearing, the axial thickness of the cycloidal wheel, the length of the needle rollers between the cycloidal wheel and the needle tooth housing, and the center distance between the two angular contact roller bearings are all increased and can be optimized to the best matching length. The contact area of ​​the first needle roller and cage bearing, the second needle roller and cage bearing, and the needle rollers and the raceway is increased, the contact stress is reduced, the service life is increased, and the torque capacity is increased.

[0025] 2. In this utility model, the number of eccentric shafts is 4-9, which effectively improves its load transmission capacity. Under this premise, the output shaft and the output end cover are connected by a central column and several connecting columns, so as to avoid the connection strength between the output shaft and the output end cover being affected by the decrease in the number and diameter of the connecting columns due to the increase in the number of eccentric shafts.

[0026] 3. The limiting structure in this utility model includes a left pressure plate, a left baffle, a left thrust bearing, a right baffle, a right pressure plate, and a right thrust bearing, which realizes axial limiting of the two ends of the eccentric shaft and the two second needle rollers and the cage bearings at one end away from each other, and effectively reduces the wear on the end of the eccentric shaft and improves the transmission efficiency.

[0027] 4. The capabilities of each component in this utility model are improved simultaneously, maximizing power density. The performance of each component matches the overall performance, meeting higher usage requirements. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a new type of high-performance RV reducer.

[0029] In the diagram: 1. Needle gear housing; 2. Output shaft; 3. Output end cover; 4. Cycloidal wheel; 5. Eccentric shaft; 6. Angular contact roller bearing; 7. First needle roller and cage bearing; 8. Needle roller; 9. Mounting hole; 10. Second needle roller and cage bearing; 11. Central column; 12. Connecting column; 13. Connecting pin; 14. Connecting screw; 15. Planetary gear; 16. Input shaft; 17. Input gear; 18. Left pressure plate; 19. Left baffle; 20. Left thrust bearing; 21. Right baffle; 22. Right pressure plate; 23. Right thrust bearing; 24. Shaft retaining ring; 25. Gasket; 26. Skeleton seal; 27. Deep groove ball bearing. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0031] A new type of high-performance RV reducer, such as Figure 1 As shown, the device includes a needle housing 1, an output shaft 2 installed within the inner bore of the needle housing 1, an output end cover 3, two cycloidal wheels 4, and 4-9 eccentric shafts 5 arranged in a circumferential array. Angular contact roller bearings 6 are respectively provided between the outer walls of the output shaft 2 and the output end cover 3 and the inner bore of the needle housing 1. The two cycloidal wheels 4 are respectively mounted on two cams of the eccentric shaft 5, with a first needle roller and cage bearing 7 between them. The outer walls of the two cycloidal wheels 4 and the inner bore of the needle housing 1 are meshed by needle rollers 8, and the needle rollers 8 are located between the two angular contact roller bearings 6. A planetary gear 15 is installed at the end of the eccentric shaft 5 near the output end cover 3. An input shaft 16 extending away from the output shaft 2 is installed on the end face of the output end cover 3 away from the output shaft 2 via a deep groove ball bearing 27. An input gear 17 that meshes with the planetary gear 15 is installed on the input shaft 16. Among them, a skeleton seal 26 is provided between the inner hole of the needle housing 1 and the outer wall of the output shaft 2, located on the side of the corresponding angular contact roller bearing 6 away from the needle roller 8.

[0032] like Figure 1 As shown, the working principle of this utility model is basically the same as that of the prior art. The input shaft 16 drives the input gear 17 to rotate and mesh with the planetary gear 15 to achieve the first stage of speed reduction transmission. The planetary gear 15 drives the eccentric shaft 5 to drive several cycloidal wheels 4 to mesh with the pin gear housing 1 to achieve the second stage of speed reduction transmission. In other embodiments, if the installation space is insufficient, it is not necessary to install planetary gears 15 on every eccentric shaft 5. Several planetary gears 15 can be evenly spaced. Other eccentric shafts 5 without planetary gears 15 can still transmit torque, effectively improving power density.

[0033] like Figure 1 As shown, in order to maximize the power density of the RV reducer while keeping the volume constant, in this embodiment, mounting holes 9 are provided on the output shaft 2 and the output end cover 3, penetrating their thickness direction and corresponding to several eccentric shafts 5. Second needle roller and cage bearings 10 are respectively provided between the true circles at both ends of the eccentric shafts 5 and the inner walls of the corresponding mounting holes 9 on the output shaft 2 and the output end cover 3. Limiting structures are provided at both ends of the eccentric shaft 5 to axially limit the two ends and the two second needle roller and cage bearings 10 at opposite ends. The two first needle roller and cage bearings 7 and the two second needle roller and cage bearings 10 are sequentially and intermittently connected along the axial direction of the eccentric shaft 5, which facilitates axial limiting while ensuring normal operation through a certain gap between the first needle roller and cage bearings 7 and the second needle roller and cage bearings 10.

[0034] Among them, such as Figure 1 As shown, the inner rings of the two angular contact roller bearings 6 are integrated with the corresponding output shaft 2 and output end cover 3. This not only improves the rigidity and precision of the angular contact roller bearings 6, but also increases the inner diameter of the mounting hole 9 by increasing the wall thickness of the output shaft 2 and output end cover 3.

[0035] like Figure 1 As shown, in this invention, the outer diameter of the true circles at both ends of the eccentric shaft 5 is maximized while the volume remains unchanged, resulting in a significant improvement in its rigidity and load-bearing capacity. The number of rollers in the second needle roller and cage bearing 10 is also maximized, thereby greatly enhancing the capacity of the second needle roller and cage bearing 10. Moreover, almost the entire axial length of the reducer is utilized by the first needle roller and cage bearing 7 and the second needle roller and cage bearing 10. The lengths of the first needle roller and cage bearing 7, the second needle roller and cage bearing 10, the axial thickness of the cycloidal wheel 4, the length of the needle rollers 8 between the cycloidal wheel 4 and the needle tooth housing 1, and the center distance between the two angular contact roller bearings 6 are all increased and optimized to the best matching length. The contact area between the first needle roller and cage bearing 7, the second needle roller and cage bearing 10, and the needle rollers 8 and the raceway is increased, the contact stress is reduced, the service life is increased, and the torque capacity is increased.

[0036] like Figure 1 As shown, similar to the prior art, the output shaft 2 and the output end cover 3 are connected by several connecting columns 12 connected by connecting pins 13 and connecting screws 14. However, due to the increased number of eccentric shafts 5 in this invention, the torque transmitted is greatly improved. In order to avoid the connection strength between the output shaft 2 and the output end cover 3 being affected by the decrease in the number and diameter of the connecting columns 12 due to the increase in the number of eccentric shafts 5, a central column 11 coaxial with it is provided on the side of the output shaft 2 near the output end cover 3. The central column 11 passes through the two cycloidal wheels 4 and is connected to the output end cover 3 by connecting pins 13 and connecting screws 14. The number of connecting columns 12 is also increased accordingly to ensure that the connection strength between the output shaft 2 and the output end cover 3 matches the overall performance.

[0037] like Figure 1 As shown, in this embodiment, the limiting structure includes a left pressure plate 18 installed on the end face of the output shaft 2 away from the output end cover 3 by screws; a left baffle 19 is provided between the end of the second needle roller and cage bearing 10 corresponding to the output shaft 2 away from the first needle roller and cage bearing 7 and the left pressure plate 18; and a left thrust bearing 20 is provided between the end of the true circle of the eccentric shaft 5 corresponding to the output shaft 2 away from the first needle roller and cage bearing 7 and the left pressure plate 18.

[0038] like Figure 1 As shown, a right baffle 21 is screwed onto the end face of the output end cover 3 away from the output shaft 2. The right baffle 21 and the end of the second needle roller and cage bearing 10 corresponding to the output end cover 3 away from the first needle roller and cage bearing 7 are in clearance contact, and the right baffle 21 is located between the output end cover 3 and the planetary gear 15. A right pressure plate 22 is provided on the end of the eccentric shaft 5 away from the output shaft 2, which is screwed onto the end face of the output end cover 3, and a right thrust bearing 23 is provided between the right pressure plate 22 and the planetary gear 15.

[0039] like Figure 1 As shown, the left pressure plate 18 and the left thrust bearing 20 are used to axially limit the end of the eccentric shaft 5 near the output shaft 2, and the right pressure plate 22 and the right thrust bearing 23 are used to axially limit the end of the eccentric shaft 5 near the output end cover 3. Under the action of the left thrust bearing 20 and the right thrust bearing 23, wear on the end of the eccentric shaft 5 can be reduced, and transmission efficiency can be improved. The left pressure plate 18 and the left baffle 19 are used to axially limit the end of the second needle roller and cage bearing 10 corresponding to the output shaft 2 away from the first needle roller and cage bearing 7, and the right baffle 21 is used to axially limit the end of the second needle roller and cage bearing 10 corresponding to the output end cover 3 away from the first needle roller and cage bearing 7, ensuring the normal operation of the two first needle roller and cage bearings 7 and the two second needle roller and cage bearings 10.

[0040] like Figure 1As shown, a axial elastic retaining ring 24 is provided on the side of the planetary gear 15 away from the right thrust bearing 23, mounted on the eccentric shaft 5 and located between the right baffle 21 and the planetary gear 15. A shim 25 is provided between the axial elastic retaining ring 24 and the planetary gear 15. In this way, by using the universal elastic retaining ring and the shim 25, in conjunction with the right thrust bearing 23 and the right baffle 21, the axial positioning of the planetary gear 15 is achieved, and the short length of the spline connecting teeth between the end of the eccentric shaft 5 and the planetary gear 15 is avoided, which makes it difficult to machine.

[0041] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A new high performance RV reducer characterized by: The pin tooth shell (1) and the output shaft (2) installed in the inner hole of the pin tooth shell (1), the output end cover (3), two cycloid wheels (4) and 4-9 eccentric shafts (5) arranged in a circular array, the outer wall of the output shaft (2) and the output end cover (3) and the inner hole of the pin tooth shell (1) are respectively provided with angular contact roller bearings (6), the two cycloid wheels (4) are respectively installed on the two cams of the eccentric shaft (5) and are provided with a first needle and cage bearing (7) therebetween, the outer wall of the two cycloid wheels (4) and the inner hole of the pin tooth shell (1) are engaged through a needle (8), and the needle (8) is located between the two angular contact roller bearings (6); The output shaft (2) and the output end cover (3) are provided with mounting holes (9) penetrating the thickness direction thereof and corresponding to the eccentric shafts (5), the true circles at the two ends of the eccentric shafts (5) and the inner walls of the corresponding mounting holes (9) of the output shaft (2) and the output end cover (3) are respectively provided with second needle and cage bearings (10); the two first needle and cage bearings (7) and the two second needle and cage bearings (10) are sequentially connected in the axial direction of the eccentric shaft (5), and the two ends of the eccentric shaft (5) are respectively provided with limiting structures for limiting the two ends and the two second needle and cage bearings (10) away from each other in the axial direction. The output shaft (2) is provided with a central column (11) coaxial with the output shaft (2) and a plurality of connecting columns (12) arranged in an array around the axis of the central column (11) on the side close to the output end cover (3), the central column (11) and the connecting columns (12) pass through the two cycloid wheels (4) and are connected with the output end cover (3) through connecting pins (13) and connecting screws (14); The eccentric shaft (5) is provided with a planetary gear (15) at the end close to the output end cover (3), the output end cover (3) is provided with an input shaft (16) extending away from the central column (11) on the end face away from the output shaft (2) through a deep groove ball bearing (27), and the input shaft (16) is provided with an input gear (17) engaged with the planetary gear (15).

2. A new high-performance RV reducer according to claim 1, characterized by: The limiting structure includes a left pressing plate (18) mounted on the end face of the output shaft (2) away from the output end cover (3) through a screw, a left baffle (19) between the end of the second needle and cage bearing (10) corresponding to the output shaft (2) away from the first needle and cage bearing (7) and the left pressing plate (18), and a left thrust bearing (20) between the end of the true circle of the eccentric shaft (5) corresponding to the output shaft (2) away from the first needle and cage bearing (7) and the left pressing plate (18).

3. A new high-performance RV reducer according to claim 2, characterized in that: The limiting structure further includes a right baffle (21) mounted on the end face of the output end cover (3) away from the output shaft (2) through a screw, the right baffle (21) and the end of the second needle and cage bearing (10) corresponding to the output end cover (3) away from the first needle and cage bearing (7) are in clearance contact, and the right baffle (21) is located between the output end cover (3) and the planetary gear (15).

4. A new high-performance RV reducer according to claim 3, characterized in that: The limiting structure further comprises a right pressing plate (22) arranged at the end of the eccentric shaft (5) away from the output shaft (2), the right pressing plate (22) is mounted on the end face of the output end cover (3) away from the output shaft (2) by a screw, and a right thrust bearing (23) is arranged between the right pressing plate (22) and the planetary gear (15).

5. A new high-performance RV reducer according to claim 4, characterized in that: A shaft elastic retainer ring (24) is arranged on the eccentric shaft (5) and between the right pressing plate (21) and the planetary gear (15) on the side of the planetary gear (15) away from the right thrust bearing (23), and a gasket (25) is arranged between the shaft elastic retainer ring (24) and the planetary gear (15).

6. A new high-performance RV reducer according to claim 1, characterized by: The inner rings of the two angle contact roller bearings (6) and the corresponding output shaft (2) and output end cover (3) are integrally arranged.

7. A new high-performance RV reducer according to claim 1, characterized by: A skeleton seal (26) is arranged between the inner hole of the pin gear shell (1) and the outer wall of the output shaft (2), and the skeleton seal (26) is located on the side of the corresponding angle contact roller bearing (6) away from the needle roller (8).

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