High-power-density RV speed reducer

Abstract

The utility model provides a high-power-density 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 at least two eccentric shafts. The cycloidal gears are respectively arranged on the cams of the eccentric shaft, and a first roller pin and a retainer bearing are arranged between the cycloidal gears; a second roller pin and a retainer bearing are arranged between the two true circles, located on the two sides of the cam, of the eccentric shaft and the output shaft and the output end cover respectively, bearing outer rings are arranged between the second roller pin and the retainer bearing and between the corresponding output shaft and the output end cover, and limiting structures are arranged at the two ends of the eccentric shaft respectively; planet wheels are installed at the ends, away from the output shaft, of the eccentric shafts, and input gears meshed with the planet wheels are arranged among the planet wheels and connected with an input shaft. According to the utility model, the power density is higher under the condition that the size is not changed, and the higher use requirement in a certain installation space is met.

Description

Technical Field

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

[0002] The RV reducer is a new type of reducer developed based on the cycloidal pinwheel drive. It includes a first-stage planetary reduction structure and a second-stage cycloidal pinwheel reduction structure. It has advantages such as high rigidity, high precision, large torque, and high transmission efficiency. Compared with a simple cycloidal pinwheel planetary drive, it has a smaller size and greater overload capacity. 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, resulting in the power density of the RV reducer not meeting the application requirements. Utility Model Content

[0003] The purpose of this invention is to provide a high power density RV reducer that can achieve higher power density without changing the volume. Its torque capacity, stiffness, bending moment, load capacity, and efficiency are all significantly improved, meeting higher usage requirements within a certain installation space.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A high-power-density RV reducer includes a pin gear housing, an output shaft, an output end cover, two cycloidal wheels, and at least two eccentric shafts arranged in a circumferential array. The pin gear housing, output shaft, output end cover, and two cycloidal wheels each have a central through hole. A support bearing is provided between the pin gear housing, the output shaft, and the output end cover. The two cycloidal wheels are respectively mounted on two cams of the eccentric shafts, with a first needle roller and cage bearing between them. The external teeth of the two cycloidal wheels mesh with the internal teeth of the pin gear housing via needle rollers. Second needle roller and cage bearings are respectively provided between two true circles on both sides of the cams of the eccentric shaft and the inner holes of the output shaft and the output end cover. The two first needle roller and cage bearings and the two second needle roller and cage bearings are arranged axially along the eccentric shaft. The second needle roller and the cage bearing are provided with a bearing outer ring that mates with them. The two ends of the eccentric shaft are respectively provided with a limiting structure that is installed on the output shaft and the output end cover and axially limits the eccentric shaft, the second needle roller and the cage bearing and the bearing outer ring. The end of the eccentric shaft away from the output shaft is equipped with a planetary gear located outside the output end cover. An input gear is provided between several planetary gears that is coaxial with the needle tooth housing and meshes with the planetary gears. The input gear is connected to an input shaft that is coaxial with it. The end of the input shaft away from the input gear extends outward from the output shaft through the central through hole of the needle tooth housing or directly to the side of the planetary gear away from the output end cover.

[0006] By adopting the above technical solution, the original tapered roller bearings between the true circles at both ends of the eccentric shaft and the output shaft and output end cover are changed to second needle roller and cage bearings and bearing outer rings, while the inner ring is eliminated. The original tapered roller bearing with angled mounting structure is changed to the current straight mounting structure of the second needle roller and cage bearing. In this way, without changing the volume, the true circle diameter of the second needle roller and cage bearings at both ends of the eccentric shaft is increased, the rigidity is greatly improved, the deformation under load is reduced, and the contact area with the second needle roller and cage bearing groove is increased, the contact stress is reduced, the service life is increased, and the torque capacity is increased. In particular, setting the bearing outer ring as the outer ring groove of the second needle roller and cage bearing is much easier than directly machining the groove on the output shaft and output end cover. The bearing outer ring is a mature finished product that is easy to manufacture and purchase. Assuming that the power density of the reducer meets the usage requirements, it can greatly reduce the production cost.

[0007] Furthermore, the limiting structure includes a first limiting step disposed on the output shaft and cooperating with the end of the second needle roller and cage bearing near the output shaft away from the first needle roller and cage bearing. The end of the eccentric shaft near the output shaft is provided with a high-hardness washer fixedly mounted on the output shaft by screws. The high-hardness washer is in clearance contact with the end of the eccentric shaft near it and the end of the second needle roller and cage bearing near it. A high-hardness nut is installed on the output end cover between the corresponding second needle roller and cage bearing and planetary gear. The high-hardness nut is threaded to the output end cover by external thread, and the high-hardness nut and the second needle roller near it are in clearance contact with the cage bearing, the outer ring of the bearing, and the true round end on the eccentric shaft.

[0008] By adopting the above technical solution, the first limiting step, high-hardness shims, and high-hardness nuts are used to axially limit the two second needle roller and cage bearings, the two bearing outer rings, and the eccentric shaft from both ends. The high-hardness shims and high-hardness nuts directly rub against both ends of the eccentric shaft, preventing axial movement of the eccentric shaft. The high-hardness shims and nuts, while maintaining the same volume, increase the axial length space provided by the eccentric shaft to the two second needle roller and cage bearings and the two first needle roller and cage bearings. This increases the axial length of the two first needle roller and cage bearings and the two second needle roller and cage bearings, the axial thickness of the two cycloidal wheels, the needle length between the cycloidal wheels and the needle tooth housing, and the center distance between the two support bearings. This enhances the capacity of the two first needle roller and cage bearings and the two second needle roller and cage bearings, increases the contact area between the needle rollers and the cycloidal wheels and the needle tooth housing, strengthens the torque transmission capacity, and increases the support capacity, bending moment, and load capacity of the two support bearings.

[0009] Furthermore, the outer rings of the two bearings are secured to the corresponding output shaft and output end cap by a plurality of first flat-head screws and first washers arranged in a circumferential array on the side closest to the first needle roller and cage bearing.

[0010] By adopting the above technical solution, the first flat-head screw and the first washer are used to axially limit the two bearing outer rings to the side that are close to each other, so as to prevent the two bearing outer rings from moving axially.

[0011] Furthermore, the limiting structure includes a first limiting step disposed on the output shaft and cooperating with the end of the second needle roller and cage bearing near the output shaft away from the first needle roller and cage bearing. A limiting washer is provided between the first limiting step and the corresponding second needle roller and cage bearing and the outer ring of the bearing. A ball bearing is disposed between the end of the eccentric shaft near the output shaft and the output shaft. The side of the outer ring of the ball bearing near the limiting washer abuts against the limiting washer. A second limiting step is disposed on the output shaft and cooperating with the side of the outer ring of the ball bearing away from the limiting washer. A left baffle is disposed at the end of the eccentric shaft near the output shaft and abutting against the side of the inner ring of the ball bearing away from the limiting washer. The left baffle is detachably fixed to the eccentric shaft by screws. A right baffle is disposed on the output end cover between the corresponding second needle roller and cage bearing and the planetary gear. The side of the right baffle near the planetary gear is locked to the output end cover by a plurality of second flat-head screws arranged in a circumferential array and a second washer.

[0012] By adopting the above technical solution, the first limiting step and limiting shims are used to limit the end of the second needle roller bearing and cage bearing and the outer ring of the bearing near the output shaft. The ball bearing and the second limiting step are used to limit the axial movement of the limiting shims. The left baffle is used to limit the ball bearing and the end of the eccentric shaft near the output shaft. The right baffle is used to limit the axial movement of the second needle roller bearing and cage bearing and the outer ring of the bearing near the output end cover, as well as the axial movement of the eccentric shaft near the output end cover. This limiting structure using limiting shims, ball bearings, left baffles, and right baffles, compared to a limiting structure using high-hardness shims and high-hardness nuts, reduces friction and wear between the limiting structure and the end of the eccentric shaft, improving transmission efficiency. Furthermore, the end near the output end cover is axially limited only by the right baffle, which is secured to the output end cover using a second flat-head screw and a second shim. This avoids occupying too much axial length and diameter on the eccentric shaft, affecting the machining of the end teeth of the eccentric shaft, and ensuring the spline connection strength between the planetary gears and the eccentric shaft.

[0013] Furthermore, the outer rings of the two bearings are secured to the corresponding output shaft and output end cap by a plurality of first flat-head screws and first washers arranged in a circumferential array on the side closest to the first needle roller and cage bearing.

[0014] By adopting the above technical solution, the first flat-head screw and the first washer are used to axially limit the two bearing outer rings to the side that are close to each other, so as to prevent the two bearing outer rings from moving axially.

[0015] Furthermore, a double-frame seal is provided between the needle tooth housing and the output shaft, and the double-frame seal is located on the side of the support bearing between the output shaft and the needle tooth housing away from the cycloidal wheel.

[0016] By adopting the above technical solution, a double-frame seal is set between the needle tooth housing and the output shaft to ensure the sealing performance between the needle tooth housing and the output shaft.

[0017] In summary, this utility model has the following beneficial effects:

[0018] 1. In this utility model, by setting a second needle roller and cage bearing and bearing outer ring between the true circles at both ends of the eccentric shaft and the output shaft and output end cover, the original tapered roller bearing with angled mounting structure is changed to the current straight mounting structure of the second needle roller and cage bearing. In this way, without changing the volume, the true circle diameter of the second needle roller and cage bearing installed at both ends of the eccentric shaft is increased, the rigidity is greatly improved, the deformation under load is reduced, and the contact area with the groove of the second needle roller and cage bearing is increased, the contact stress is reduced, the service life is increased, and the torque capacity is increased.

[0019] 2. When the limiting structure in this utility model is a first step, a high-hardness washer, and a high-hardness nut, it can achieve an increase in the length space provided axially upward by the eccentric shaft to the two second needle rollers and cage bearings and the two first needle rollers and cage bearings without changing the volume. This increases the axial length of the two first needle rollers and cage bearings, the two second needle rollers and cage bearings, the axial thickness of the two cycloidal wheels, the length of the needle rollers between the cycloidal wheels and the needle tooth housing, and the center distance between the two support bearings. As a result, the capacity of the two first needle rollers and cage bearings and the two second needle rollers and cage bearings is enhanced, the contact area between the needle rollers and the cycloidal wheels and the needle tooth housing is increased, the torque transmission capacity is enhanced, and the support capacity, bending moment, and load capacity of the two support bearings are strengthened.

[0020] 3. When the limiting structure in this utility model consists of a first step, a limiting washer, a ball bearing, a second limiting step, a left baffle, and a right baffle, it can reduce the friction and wear between the limiting structure and the end of the eccentric shaft, improve the transmission efficiency, and the right baffle at the end near the output end cover provides axial limiting, avoiding occupying too much axial length and diameter on the eccentric shaft and affecting the machining of the teeth at the end of the eccentric shaft, thus ensuring the spline connection strength between the planetary gear and the eccentric shaft.

[0021] 4. This utility model can achieve higher power density without changing the volume, and its torque capacity, stiffness, bending moment, load, efficiency and other capabilities are greatly improved, meeting higher usage requirements within a certain installation space. Attached Figure Description

[0022] Figure 1 It is a high power density RV reducer as described in Example 1;

[0023] Figure 2 It is a high power density RV reducer as described in Example 2.

[0024] In the diagram, 1. Needle tooth housing; 2. Output shaft; 3. Output end cover; 4. Cycloidal wheel; 5. Eccentric shaft; 6. Support bearing; 7. First needle roller and cage bearing; 8. Needle roller; 9. Second needle roller and cage bearing; 10. Bearing outer ring; 11. Planetary gear; 12. Input gear; 13. Input shaft; 14. First limiting step; 15. High-hardness washer; 16. High-hardness nut; 17. First flat-head screw; 18. First washer; 19. Limiting washer; 20. Ball bearing; 21. Second limiting step; 22. Left baffle; 23. Right baffle; 24. Second flat-head screw; 25. Second washer; 26. Double-frame seal. Detailed Implementation

[0025] 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.

[0026] Example 1:

[0027] A high power density RV reducer, such as Figure 1 As shown, its basic structure and working principle are the same as those in the prior art, including a needle-tooth housing 1, an output shaft 2, an output end cover 3, two cycloidal wheels 4, and at least two eccentric shafts 5 arranged in a circular array. The needle-tooth housing 1, output shaft 2, output end cover 3, and two cycloidal wheels 4 are all provided with a central through hole. Support bearings 6 are provided between the needle-tooth housing 1, the output shaft 2, and the output end cover 3. The two cycloidal wheels 4 are respectively mounted on two cams of the eccentric shaft 5, and a first needle roller and cage bearing 7 is provided between them. The external teeth of the two cycloidal wheels 4 mesh with the internal teeth of the needle-tooth housing 1 through needle rollers 8. A planetary gear 11 located outside the output end cover 3 is installed at the end of the eccentric shaft 5 away from the output shaft 2. An input gear 12 is provided between several planetary gears 11, which is coaxial with the needle-tooth housing 1 and meshes with the planetary gears 11. The input gear 12 is connected to an input shaft 13 coaxial with it.

[0028] Among them, such as Figure 1 As shown, the end of the input shaft 13 away from the input gear 12 extends outward from the center through hole of the pin tooth housing 1, or as... Figure 2 As shown, the end of the input shaft 13 away from the input gear 12 extends directly towards the planetary gear 11 away from the output end cover 3. The input shaft 13 drives the input gear 12 to rotate and mesh with the planetary gear 11, realizing the first stage of speed reduction. The planetary gear 11 drives the cycloidal wheel 4 through the eccentric shaft 5 to mesh with the needle housing 1 through the needle roller 8, realizing the second stage of speed reduction. In addition, a double-frame seal 26 is provided between the needle housing 1 and the output shaft 2, and the double-frame seal 26 is located on the side of the support bearing 6 between the output shaft 2 and the needle housing 1 away from the cycloidal wheel 4, realizing the sealing between the needle housing 1 and the output shaft 2.

[0029] like Figure 1 As shown, unlike the prior art, second needle roller and cage bearings 9 are respectively provided between the two true circles on both sides of the eccentric shaft 5 and the inner holes of the output shaft 2 and the output end cover 3. The two first needle roller and cage bearings 7 and the two second needle roller and cage bearings 9 are sequentially and intermittently connected along the axial direction of the eccentric shaft 5, which facilitates mutual cooperation and axial limiting while ensuring normal operation. A bearing outer ring 10 is provided between the second needle roller and cage bearing 9 and the corresponding inner holes of the output shaft 2 and the output end cover 3. Limiting structures are respectively provided at both ends of the eccentric shaft 5, mounted on the output shaft 2 and the output end cover 3, to axially limit the eccentric shaft 5, the second needle roller and cage bearings 9, and the bearing outer rings 10.

[0030] Specifically, in this embodiment, such as Figure 1 As shown, the limiting structure includes a first limiting step 14 disposed on the output shaft 2 and engaging with the end of the second needle roller and cage bearing 9 near the output shaft 2 away from the first needle roller and cage bearing 7. A high-hardness washer 15 is provided at the end of the eccentric shaft 5 near the output shaft 2 and is fixedly mounted on the output shaft 2 by screws. The high-hardness washer 15 has clearance contact with the end of the eccentric shaft 5 near it and the end of the second needle roller and cage bearing 9 near it. A high-hardness nut 16 is installed on the output end cover 3 between the corresponding second needle roller and cage bearing 9 and planetary gear 11. The high-hardness nut 16 is threaded to the output end cover 3 via external threads, and has clearance contact with the second needle roller and cage bearing 9, the bearing outer ring 10, and the true circular end of the eccentric shaft 5 near it. The two bearing outer rings 10 are respectively locked to the corresponding output shaft 2 and output end cover 3 by a plurality of first flat-head screws 17 and first washers arranged in a circumferential array on the side near the first needle roller and cage bearing 7.

[0031] like Figure 1As shown, the original tapered roller bearings between the true circles at both ends of the eccentric shaft 5 and the output shaft 2 and output end cover 3 have been changed to second needle roller and cage bearings 9 and bearing outer ring 10, while the inner ring has been eliminated. The original tapered roller bearing with angled mounting structure has been changed to the current straight mounting structure of second needle roller and cage bearings 9. In this way, without changing the volume, the diameter of the true circles at both ends of the eccentric shaft 5 where the second needle roller and cage bearings 9 are mounted has increased, the rigidity has been greatly improved, the deformation under load has decreased, and the contact area with the groove of the second needle roller and cage bearings 9 has increased, the contact stress has decreased, the service life has increased, and the torque capacity has increased.

[0032] like Figure 1 As shown, the use of ultra-thin high-hardness shims 15 and high-hardness nuts 16 for axial limiting not only prevents axial movement between the second needle rollers and the cage bearing 9, the outer ring 10 of the bearing, and the eccentric shaft 5, but also, without changing the volume, increases the axial length space provided by the eccentric shaft 5 to the two second needle rollers and cage bearings 9 and the two first needle rollers and cage bearings 7. This increases the axial length of the two first needle rollers and cage bearings 7 and the two second needle rollers and cage bearings 9, the axial thickness of the two cycloidal wheels 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 support bearings 6. Consequently, the capacity of the two first needle rollers and cage bearings 7 and the two second needle rollers and cage bearings 9 is enhanced, the contact area between the needle rollers 8 and the cycloidal wheel 4 and the needle tooth housing 1 is increased, the torque transmission capacity is enhanced, and the support capacity, bending moment, and load capacity of the two support bearings 6 are strengthened.

[0033] Example 2:

[0034] A high power density RV reducer, such as Figure 1 and Figure 2 As shown, the limiting structure also includes a first limiting step 14 disposed on the output shaft 2 and engaging with the end of the second needle roller and cage bearing 9 close to the output shaft 2 away from the first needle roller and cage bearing 7. However, unlike Embodiment 1, a limiting shim 19 is provided between the first limiting step 14 and the corresponding second needle roller and cage bearing 9 and bearing outer ring 10. A ball bearing 20 is disposed between the end of the eccentric shaft 5 close to the output shaft 2 and the output shaft 2. The outer ring of the ball bearing 20 abuts against the limiting shim 19 on the side close to the limiting shim 19. A second limiting step 21 is provided on the output shaft 2 to engage with the side of the outer ring of the ball bearing 20 away from the limiting shim 19. The ball bearing 20 can be a deep groove ball bearing or a four-point ball bearing.

[0035] like Figure 2As shown, a left baffle 22 is provided at the end of the eccentric shaft 5 near the output shaft 2, which abuts against the inner ring of the ball bearing 20 away from the limiting washer 19. The left baffle 22 is detachably fixed to the eccentric shaft 5 by screws. A right baffle 23 is installed on the output end cover 3 between the corresponding second needle roller and cage bearing 9 and planetary gear 11. The right baffle 23 is locked to the output end cover 3 near the planetary gear 11 by a number of second flat-head screws 24 arranged in a circumferential array and a second washer 25.

[0036] like Figure 1 and Figure 2 As shown, in this embodiment, the axial limiting structure of the two bearing outer rings 10 near the first needle roller and cage bearing 7 is the same as in embodiment one. They are locked to the corresponding output shaft 2 and output end cover 3 by a number of first flat-head screws 17 and first washers 18 arranged in a circumferential array.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the limiting structure using limiting shims 19, ball bearings 20, left baffles 22, and right baffles 23, compared to the limiting structure using high-hardness shims 15 and high-hardness nuts 16 in Embodiment 1, can reduce friction and wear between the limiting structure and the end of the eccentric shaft 5, thereby improving transmission efficiency. Furthermore, the end near the output end cover 3 is axially limited only by the right baffle 23, which is secured to the output end cover 3 using the second flat-head screw 24 and the second shim 25. This avoids occupying too much axial length and diameter on the eccentric shaft 5, affecting the machining of the teeth at the end of the eccentric shaft 5, and ensuring the spline connection strength between the planetary gear 11 and the eccentric shaft 5.

[0038] 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 high power density RV reducer, characterized in that: The device includes a needle tooth housing (1), an output shaft (2), an output end cover (3), two cycloidal wheels (4), and at least two eccentric shafts (5) arranged in a circumferential array. The needle tooth housing (1), the output shaft (2), the output end cover (3), and the two cycloidal wheels (4) are all provided with a central through hole. A support bearing (6) is provided between the needle tooth housing (1), the output shaft (2), and the output end cover (3). The two cycloidal wheels (4) are respectively mounted on two cams of the eccentric shaft (5), and a first needle roller and cage bearing (7) is provided between them. The external teeth of the two cycloidal wheels (4) mesh with the internal teeth of the needle tooth housing (1) through needle rollers (8). A second needle roller and cage bearing (9) is provided between the two true circles on both sides of the cams of the eccentric shaft (5) and the inner holes of the output shaft (2) and the output end cover (3). The two first needle roller and cage bearings (7) and the two second needle roller and cage bearings (9) are sequentially and intermittently connected along the axial direction of the eccentric shaft (5). A bearing outer ring (10) is provided between the cage bearing (9) and the corresponding output shaft (2) and output end cover (3) inner hole. The eccentric shaft (5) is provided with a limiting structure at both ends, which is installed on the output shaft (2) and the output end cover (3) and axially limits the eccentric shaft (5), the second needle roller, the cage bearing (9) and the bearing outer ring (10). A planetary gear (11) located outside the output end cover (3) is installed at the end of the eccentric shaft (5) away from the output shaft (2). An input gear (12) is provided between several planetary gears (11) and is coaxially arranged with the needle housing (1) and meshes with the planetary gear (11). The input gear (12) is connected to an input shaft (13) coaxially arranged with it. The end of the input shaft (13) away from the input gear (12) extends through the central through hole of the needle housing (1) to the outside of the output shaft (2) or directly to the side of the planetary gear (11) away from the output end cover (3).

2. The high power density RV reducer according to claim 1, characterized in that: The limiting structure includes a first limiting step (14) disposed on the output shaft (2) and cooperating with the end of the second needle roller and cage bearing (9) close to the output shaft (2) away from the first needle roller and cage bearing (7). The end of the eccentric shaft (5) close to the output shaft (2) is provided with a high hardness washer (15) fixedly mounted on the output shaft (2) by screws. The high hardness washer (15) is in clearance contact with the end of the eccentric shaft (5) close to it and the end of the second needle roller and cage bearing (9) close to it. The output end cover (3) is equipped with a high hardness nut (16) located between the corresponding second needle roller and cage bearing (9) and planetary gear (11). The high hardness nut (16) is threaded to the output end cover (3) by external thread, and the high hardness nut (16) is in clearance contact with the end of the second needle roller and cage bearing (9), the outer ring (10) of the bearing, and the true round end of the eccentric shaft (5) close to it.

3. The high power density RV reducer according to claim 2, characterized in that: The two outer rings (10) of the bearings are secured to the corresponding output shaft (2) and output end cap (3) on the side near the first needle roller and cage bearing (7) by a number of first flat-head screws (17) and first washers (18) arranged in a circumferential array.

4. The high power density RV reducer according to claim 1, characterized in that: The limiting structure includes a first limiting step (14) disposed on the output shaft (2) and cooperating with the end of the second needle roller and cage bearing (9) close to the output shaft (2) away from the first needle roller and cage bearing (7). A limiting shim (19) is provided between the first limiting step (14) and the corresponding second needle roller and cage bearing (9) and bearing outer ring (10). A ball bearing (20) is provided between the end of the eccentric shaft (5) close to the output shaft (2) and the output shaft (2). The side of the outer ring of the ball bearing (20) close to the limiting shim (19) abuts against the limiting shim (19). The output shaft (2) is provided with a limiting shim that is far from the outer ring of the ball bearing (20). A second limiting step (21) is provided on the side of the limiting shim (19); the end of the eccentric shaft (5) near the output shaft (2) is provided with a left baffle (22) that abuts against the side of the inner ring of the ball bearing (20) away from the limiting shim (19), and the left baffle (22) is detachably fixed on the eccentric shaft (5) by screws; a right baffle (23) is installed on the output end cover (3) between the corresponding second needle roller and cage bearing (9) and planetary gear (11), and the side of the right baffle (23) near the planetary gear (11) is locked on the output end cover (3) by a number of second flat-head screws (24) arranged in a circumferential array and a second shim (25).

5. The high power density RV reducer according to claim 4, characterized in that: The two outer rings (10) of the bearings are secured to the corresponding output shaft (2) and output end cap (3) on the side near the first needle roller and cage bearing (7) by a number of first flat-head screws (17) and first washers (18) arranged in a circumferential array.

6. The high power density RV reducer according to claim 1, characterized in that: A double-frame seal (26) is provided between the needle tooth housing (1) and the output shaft (2), and the double-frame seal (26) is located on the side of the support bearing (6) between the output shaft (2) and the needle tooth housing (1) away from the cycloidal wheel (4).

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