A compact high-torque two-stage reducer for a vehicle active stabilizer bar

Abstract

The application provides a compact high-torque two-stage reducer for a vehicle active stabilizer bar, comprising a housing, a first planetary gear train, a second planetary gear train, a sealing assembly and an output flange; the first planetary gear train and the second planetary gear train are installed into the housing, a first sun gear of the first planetary gear train serving as an output end; the output flange is connected with a second planetary carrier of the second planetary gear train, and the output flange serves as an output end; a first planetary carrier of the first planetary gear train and a second sun gear of the second planetary carrier are fixedly connected, so that the first sun gear is driven to rotate to drive the output flange to rotate; and the sealing assembly seals the first planetary gear train and the second planetary gear train in the housing. The application can solve the problems of low torque density, long axial size and insufficient torsional stiffness of the existing active stabilizer bar driving system.

Description

Technical Field

[0001] This invention belongs to the field of vehicle chassis control, and in particular relates to a compact high-torque two-stage reducer for vehicle active stabilizer bars. Background Technology

[0002] The vehicle active stabilizer bar system is a key component for improving vehicle handling stability and comfort. It uses a motor to drive a reducer to generate a torque opposite to the direction of body roll, thereby suppressing body roll. As a core transmission component, the performance of the reducer directly determines the response speed, output torque, and reliability of the entire system.

[0003] Most existing active stabilizer bars are three-stage NGW planetary reduction gears. Although they can achieve a large reduction ratio, they have low transmission efficiency, are prone to overheating, have long axial dimensions, and low torsional stiffness.

[0004] Typical NGW planetary gear mechanisms include:

[0005] Sun gear: center input gear;

[0006] Planetary gears: 3-6 evenly distributed gears that mesh with both the sun gear and the external ring gear;

[0007] Planet carrier: The rotating frame that supports the planetary gears;

[0008] Gear ring: External or internal gear fixing / output component;

[0009] Table 1 below shows the typical transmission ratio parameters for the NGW planetary carrier output scheme:

[0010] Table 1:

[0011]

[0012] Where i is the transmission ratio; Zr is the number of teeth on the ring gear; and Zs is the number of teeth on the sun gear.

[0013] With 3 planetary gears, the maximum speed ratio can reach approximately 12.5;

[0014] With 4 planetary gears, the maximum speed ratio can reach around 5.

[0015] With 5 planetary gears, the maximum speed ratio can reach about 4.

[0016] Increasing the number of planetary gears limits the gear ratio. The planetary mechanism at the end of the gearbox bears a large load, so the number of planetary gears is increased to distribute the load, typically 4-6. This reduces the gear ratio. Therefore, the gear ratio range of NGW's two-stage reducer is around 36-45. Summary of the Invention

[0017] In view of this, the present invention aims to propose a compact high-torque two-stage reducer for vehicle active stabilizer bars, in order to solve the problems of low torque density, long axial dimension and insufficient torsional stiffness in existing active stabilizer bar drive systems.

[0018] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0019] A compact high-torque two-stage reducer for a vehicle active stabilizer bar includes a housing, a first-stage planetary gear train, a second-stage planetary gear train, a sealing assembly, and an output flange;

[0020] The primary planetary gear train and the secondary planetary gear train are installed in the housing, with the primary sun gear of the primary planetary gear train serving as the input end;

[0021] The output flange is connected to the second-stage planetary carrier of the second-stage planetary gear train, and the output flange serves as the output end;

[0022] The primary planetary carrier and the secondary sun gear of the primary planetary gear train are fixedly connected, so that the rotation of the primary sun gear drives the output flange to rotate.

[0023] The sealing assembly seals the primary and secondary planetary gear trains within the housing.

[0024] Furthermore, the primary planetary gear train includes a primary planet carrier, a primary sun gear, a primary ring gear, and a double gear set;

[0025] The first-stage sun gear is located at the center of the double gear set; the first-stage planetary carrier is used to mount the double gear set, the first-stage ring gear is installed inside the housing, and the double gear set meshes with the internal teeth of the first-stage ring gear and the first-stage sun gear respectively.

[0026] Furthermore, the double gear set includes three double gear bodies, which are evenly installed in the first-stage planetary carrier; the double gear body includes a large gear and a small gear.

[0027] The primary sun gear is positioned between the three large gears and meshes with them; the three small gears mesh with the internal teeth of the primary gear ring respectively.

[0028] Furthermore, the secondary planetary gear train includes a secondary planetary carrier, a secondary sun gear, a secondary screw, a secondary planetary gear set, tapered roller bearings, angular contact bearings, nut washers, and lock nuts;

[0029] The secondary screw is connected to the center of the primary planetary carrier via the secondary sun gear to form an integrated structure;

[0030] The secondary planetary carrier is divided into a secondary carrier body and a mating part. The secondary carrier body is used to install the secondary planetary gear set. The inner wall of the housing is provided with secondary internal teeth at the position corresponding to the secondary planetary gear set. The secondary planetary gear set meshes between the secondary internal teeth of the housing and the secondary sun gear.

[0031] The tapered roller bearing is positioned between the secondary screw and the inner wall of the secondary planetary carrier;

[0032] The angular contact bearing is disposed between the outer wall of the secondary planetary carrier and the inner wall of the housing;

[0033] The locking nut is threaded to the threaded end of the secondary screw to lock the tapered roller bearing; a locking washer is provided between the locking nut and the tapered roller bearing.

[0034] Furthermore, the secondary planetary gear set includes three evenly distributed secondary planetary gear bodies A and one secondary planetary gear body B, wherein the secondary planetary gear body A is a conventional planetary gear structure;

[0035] The secondary planetary gear body B includes a first gear, a second gear, a C-type spring, a needle roller bearing, and a support rod; the inner surfaces of the first gear and the second gear are both provided with C-type grooves, and the C-type spring is installed between the two C-type grooves, so that the first gear and the second gear are misaligned, and the centers of their tooth grooves are angularly different.

[0036] The support rod is connected to the first gear and the second gear through a needle roller bearing. Locking pins are also provided at both ends of the support rod to ensure that the first gear and the second gear are in close contact.

[0037] The first gear and the second gear mesh with the secondary internal gear and the secondary sun gear of the housing, respectively.

[0038] Furthermore, the interior of the mating part is stepped, including a small circular segment and a large circular segment. One end of the small circular segment is provided with a boss, and the other end is provided with an internal thread. A stepped structure is formed between the secondary sun gear and the secondary screw.

[0039] The boss and stepped structure respectively limit the position of one end of the tapered roller bearing. By setting the No. 1 locking external gear ring to be connected to the internal thread of the small circular segment, the No. 1 locking external gear ring and the locking nut together achieve the locking of the tapered roller bearing.

[0040] Furthermore, the secondary planetary carrier has an external thread near the end outer wall, and the locking of the diagonal contact bearing is achieved by connecting the second locking internal gear ring to the external thread of the secondary planetary carrier.

[0041] Furthermore, the sealing assembly includes an oil seal seat, an oil seal ring, an external sealing toothed ring, a sealing cap, and a retaining ring;

[0042] The oil seal seat is disposed within the housing and contacts the outer ring of the angular contact bearing. A sealing ring is provided between the oil seal seat and the housing, and the oil seal ring is disposed between the oil seal seat and the secondary planetary carrier.

[0043] The inner wall of the end of the housing is provided with internal threads, and the sealing external gear ring is connected to the internal threads of the inner wall of the end of the housing to simultaneously achieve the compression of the oil seal seat and the oil seal ring;

[0044] The sealing cap is located on the large circular section of the mating part, and a sealing ring is provided between the sealing cap and the large circular section. The large circular section is also provided with a groove, and a retaining ring is installed into the groove to lock the sealing ring.

[0045] Furthermore, the output flange is connected to the end face of the secondary planetary carrier by bolts.

[0046] Furthermore, the end face of the secondary planetary carrier is provided with splines, and the end face of the output flange is also provided with splines. The splines of the two cooperate with each other to achieve limit fixation.

[0047] Compared to existing technologies, the compact high-torque two-stage reducer for vehicle active stabilizer bars described in this invention has the following advantages:

[0048] (1) The present invention describes a compact high-torque two-stage reducer for vehicle active stabilizer bars, which adopts a two-stage reduction scheme combining NW and NGW planetary gear trains: the first stage is an NW type planetary gear train reduction, and the second stage is an NGW type planetary gear train reduction; through the combination of NW and NGW planetary gear trains, the function of large transmission ratio of two-stage reduction is realized, and the reducer achieves high torque output, high torsional stiffness, short axial dimension and high transmission efficiency, which is particularly suitable for vehicle active stabilizer bar systems with limited space.

[0049] (2) The compact high-torque two-stage reducer for vehicle active stabilizer bar described in this invention supports the first-stage planetary gear set by a pair of back-to-back tapered roller bearings, breaking the traditional fixed support method on both sides of the shaft shoulder, eliminating the bearing position on one side, and greatly shortening the axial space.

[0050] (3) The compact high-torque two-stage reducer for vehicle active stabilizer bar described in this invention has a two-stage planetary gear system that eliminates gear backlash. Through a C-type spring, the first gear and the second gear of the two-stage planetary gear body B can be misaligned in the circumferential direction, so that the center of the two tooth grooves forms an angle difference. The tooth surfaces of the first gear and the second gear are simultaneously engaged with the internal gear of the two-stage gear and the sun gear of the two-stage gear and the gear meshing clearance is eliminated. Under alternating torsional load and impact load, it can reduce gear NVH (noise, vibration and acoustic roughness) and improve response time.

[0051] (4) The compact high-torque two-stage reducer for vehicle active stabilizer bar described in this invention has the characteristics of compact structure and strong load-bearing capacity of the first stage NW planetary gear system. When combined with the second stage NGW planetary gear system, a two-stage large reduction ratio is achieved and a high output torque is obtained. At the same time, the planetary gear system undertakes the main reduction task, effectively shortening the axial dimension of the entire transmission chain.

[0052] (5) The compact high-torque two-stage reducer for vehicle active stabilizer bar described in this invention has an integrated design of the two-stage internal gear and housing, an interference fit with the first-stage internal gear ring, and a layout supported by angular contact bearings on the two-stage planetary carrier. It has a two-stage planetary gear train that eliminates gear backlash, which greatly enhances the torsional stiffness and impact resistance of the transmission system, reduces transmission error, and improves the system's response speed and control accuracy.

[0053] (6) The compact high-torque two-stage reducer for vehicle active stabilizer bars described in this invention has a robust housing structure, reasonable bearing arrangement, effective sealing design and built-in lubrication system, which ensures that the reducer can withstand the severe vibration and impact loads during vehicle operation, adapt to harsh working environments, has a long service life and long maintenance-free cycle. Through the standardized output flange interface, this reducer can be easily matched with different models of motors, has a high degree of integration, and is easy to promote and apply on the whole vehicle platform. Attached Figure Description

[0054] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0055] Figure 1 This is a schematic diagram of a compact high-torque two-stage reducer for a vehicle active stabilizer bar, as described in an embodiment of the present invention.

[0056] Figure 2 This is a cross-sectional view of a compact high-torque two-stage reducer for a vehicle active stabilizer bar, as described in an embodiment of the present invention.

[0057] Figure 3 This is an exploded view of a compact high-torque two-stage reducer for a vehicle active stabilizer bar, as described in an embodiment of the present invention.

[0058] Figure 4 This is an exploded view of the secondary planetary gear body B according to an embodiment of the present invention;

[0059] Figure 5 This is a schematic diagram showing the misalignment of gear 1 and gear 2 in the secondary planetary gear body B according to an embodiment of the present invention.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1. Housing; 11. Second-stage internal gear; 2. First-stage planetary gear train; 21. First-stage planetary carrier; 22. First-stage sun gear; 23. First-stage ring gear; 24. Double gear set; 3. Second-stage planetary gear train; 31. Second-stage planetary carrier; 32. Second-stage sun gear; 33. Second-stage screw; 34. Second-stage planetary gear set; 341. Second-stage planetary gear body A; 342. Second-stage planetary gear body B; 3421. Gear No. 1; 3422. Gear No. 2 3423, C-type spring; 3424, needle roller bearing; 3425, support rod; 3426, C-groove; 35, tapered roller bearing; 36, angular contact bearing; 37, nut washer; 38, lock nut; 39, No. 1 locking external gear ring; 310, No. 2 locking internal gear ring; 4, sealing assembly; 41, oil seal seat; 42, oil seal ring; 43, sealing external gear ring; 44, sealing cover; 45, retaining ring; 5, output flange. Detailed Implementation

[0062] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0063] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0066] A compact, high-torque two-stage reducer for vehicle active stabilizer bars, such as Figures 1-5 As shown, it includes a housing 1, a primary planetary gear train 2, a secondary planetary gear train 3, a sealing assembly 4, and an output flange 5;

[0067] The first-stage planetary gear train 2 and the second-stage planetary gear train 3 are installed in the housing 1, with the first-stage sun gear 22 of the first-stage planetary gear train 2 serving as the input end;

[0068] The output flange 5 is connected to the second-stage planetary carrier 31 of the second-stage planetary gear train 3, and the output flange 5 serves as the output end;

[0069] The primary planetary carrier 21 of the primary planetary gear train 2 and the secondary sun gear 32 of the secondary planetary carrier 31 are fixedly connected, so that the rotation of the primary sun gear 22 drives the output flange 5 to rotate.

[0070] The sealing assembly 4 seals the first-stage planetary gear train 2 and the second-stage planetary gear train within the housing 1, ensuring that the lubricating grease inside the reducer does not leak and that external impurities and moisture do not intrude.

[0071] Preferably, the first-stage planetary gear train 2 includes a first-stage planet carrier 21, a first-stage sun gear 22, a first-stage ring gear 23, and a double gear set 24;

[0072] The first-stage sun gear 22 is located at the center of the double gear set 24; the first-stage planetary carrier 21 is used to mount the double gear set 24, the first-stage ring gear 23 is mounted inside the housing 1, and the double gear set 24 meshes with the internal teeth of the first-stage ring gear 23 and the first-stage sun gear 22 respectively.

[0073] Preferably, the double gear set 24 includes three double gear bodies, which are evenly installed in the first-stage planetary carrier 21; the double gear set body includes a large gear and a small gear.

[0074] The primary sun gear 22 is positioned between the three large gears and meshes with them; the three small gears respectively mesh with the internal teeth of the primary gear ring 23.

[0075] Preferably, the secondary planetary gear train 3 includes a secondary planetary carrier 31, a secondary sun gear 32, a secondary screw 33, a secondary planetary gear set 34, a tapered roller bearing 35, an angular contact bearing 36, a nut washer 37, and a lock nut 38;

[0076] The secondary screw 33 is connected to the center of the primary planetary carrier 21 via the secondary sun gear 32 to form an integrated structure;

[0077] The secondary planetary carrier 31 is divided into a secondary carrier body and a mating part. The secondary carrier body is used to install the secondary planetary gear set 34.

[0078] The inner wall of the housing 1 is provided with a secondary internal tooth 11 at a position corresponding to the secondary planetary gear set, and the secondary planetary gear set 34 meshes between the secondary internal tooth 11 and the secondary sun gear 32 of the housing 1.

[0079] The tapered roller bearing 35 is disposed between the inner wall of the secondary screw 33 and the secondary planetary carrier 31;

[0080] The angular contact bearing 36 is disposed between the outer wall of the secondary planetary carrier 31 and the inner wall of the housing 1;

[0081] The locking nut 38 is threadedly connected to the threaded end of the secondary screw 33 to lock the tapered roller bearing 35; a locking washer is provided between the locking nut 38 and the tapered roller bearing 35.

[0082] Preferably, the secondary planetary gear set 34 includes three evenly distributed secondary planetary gear bodies A341 and one secondary planetary gear body B342, wherein the secondary planetary gear body A341 is a conventional planetary gear structure;

[0083] like Figure 4 As shown, the secondary planetary gear body B342 includes a first gear 3421, a second gear 3422, a C-shaped spring 3423, a needle roller bearing 3424, and a support rod 3425. Both the first gear 3421 and the second gear 3422 have C-shaped grooves 3426 on their inner surfaces. The C-shaped grooves 3426 of the first gear 3421 and the second gear 3422 are misaligned. The C-shaped spring 3423 is installed between the two C-shaped grooves 3426, causing a misalignment between the first gear 3421 and the second gear 3422. Figure 5 As shown, this creates an angular difference between the centers of the tooth grooves of the two teeth;

[0084] The C-shaped groove 3426 is provided with a first locking block A and a first locking block B respectively. The two sides of the first locking block A and the first locking block B are planar structures. The opening of the C-shaped spring 3423 is an arc-shaped structure. There is no gap between the first gear 3421 and the second gear 3422.

[0085] By setting the offset angle between the first locking block A, the first locking block B and the center line of the tooth groove to form an angle difference, the preload of the C-type spring 3423 is achieved. The C-type spring 3423 is set in the C-type groove 3426, and there is a gap between it and the groove wall of the C-type groove 3426, which provides deformation space for the C-type spring 3423 and avoids misaligned teeth from not being able to be aligned.

[0086] The support rod 3425 is connected to the first gear 3421 and the second gear 3422 through the needle roller bearing 3424. Locking pins are also provided at both ends of the support rod 3425 to make the first gear 3421 and the second gear 3422 in close contact.

[0087] The first gear 3421 and the second gear 3422 mesh with the secondary internal gear 11 and the secondary sun gear 32 of the housing 1, respectively.

[0088] The C-type spring enables the first and second gears of the second-stage planetary gear body B to be misaligned in the circumferential direction, resulting in an angular difference between the centers of the two tooth grooves. The tooth surfaces of the first and second gears simultaneously engage with the second-stage internal gear and the second-stage sun gear, eliminating gear meshing clearance. Under alternating torsional loads and impact loads, this reduces gear NVH and improves response time.

[0089] Preferably, the interior of the mating part is stepped, including a small circular segment and a large circular segment. One end of the small circular segment is provided with a boss, and the other end is provided with an internal thread. A stepped structure is formed between the secondary sun gear and the secondary screw 33.

[0090] The boss and the stepped structure respectively limit one end of the tapered roller bearing 35. By setting the No. 1 locking external gear ring 39 to be connected to the internal thread of the small circular segment, the No. 1 locking external gear ring 39 and the locking nut 38 together lock the tapered roller bearing 35.

[0091] Preferably, the secondary planetary carrier has an external thread near the end outer wall, and the diagonal contact bearing 36 is locked by setting a second locking internal gear ring 310 to connect with the external thread of the secondary planetary carrier.

[0092] Preferably, the sealing assembly 4 includes an oil seal seat 41, an oil seal ring 42, an outer sealing toothed ring 43, a sealing cover 44, and a retaining ring 45;

[0093] The oil seal seat 41 is disposed inside the housing 1 and contacts the outer ring of the angular contact bearing 36. A sealing ring is provided between the oil seal seat 41 and the housing 1. The oil seal ring 42 is disposed between the oil seal seat 41 and the secondary planetary carrier 31.

[0094] The inner wall of the end of the housing 1 is provided with an internal thread, and the sealing external gear ring 43 is connected to the internal thread of the inner wall of the end of the housing 1, thereby achieving the pressing of the oil seal seat 41 and the oil seal ring 42.

[0095] The sealing cap 44 is located on the large circular section of the mating part. A sealing ring is provided between the sealing cap 44 and the large circular section. The large circular section is also provided with a groove. A retaining ring 45 is installed into the groove to lock the sealing ring.

[0096] Preferably, the output flange 5 is connected to the end face of the secondary planetary carrier 31 by bolts.

[0097] Preferably, the end face of the secondary planetary carrier 31 is provided with a spline, and the end face of the output flange 5 is also provided with a spline. The splines of the two cooperate with each other to achieve limit fixation.

[0098] Working principle: The power source drives the first-stage sun gear 22 of the first-stage planetary gear train 2 to rotate, and the first-stage sun gear 22 drives the large gear of the double gear set 24 that meshes with it; the small gear of the double gear set 24 meshes with the first-stage gear ring 23 fixed on the housing 1; since the gear ring is fixed, the double gear set 24 will revolve around the sun gear, thereby driving the first-stage planetary carrier 21 to rotate at a lower speed and a higher torque.

[0099] The first-stage planetary carrier 21 is fixedly connected to the second-stage sun gear 32 of the second-stage planetary gear train 3. Therefore, the output of the first-stage planetary carrier 21 directly becomes the input of the second-stage sun gear 32.

[0100] The secondary planetary gear set 34 meshes with the secondary internal gear 11 fixed on the housing 1; also because the internal gear is fixed, the planetary gear will drive the secondary planetary carrier 31 to rotate at a lower speed and higher torque; the secondary planetary carrier 31 is firmly connected to the output flange 5 by splines and bolts, and finally the power output after two stages of reduction and torque increase is used to drive the vehicle's stabilizer bar.

[0101] Example:

[0102] A transmission scheme combining NW-type planetary mechanisms and NGW-type planetary mechanisms;

[0103] Typical NW planetary gear mechanisms include:

[0104] Sun gear: center input gear;

[0105] Double planetary gears: 3-4 evenly distributed gears that mesh with both the sun gear and the external ring gear;

[0106] Planet carrier: The rotating frame that supports the planetary gears;

[0107] Gear ring: External or internal gear fixing / output component;

[0108] Table 2 below shows the typical transmission ratio parameters for the NW planetary carrier output scheme:

[0109] Table 2:

[0110]

[0111] Where Zr is the number of teeth on the gear ring; Zp1 is the number of teeth on the first-stage planetary gear; Zp2 is the number of teeth on the second-stage planetary gear; and Zs is the number of teeth on the sun gear.

[0112] The double planetary gear set has 3 planetary gears, and the maximum speed ratio can reach about 22.

[0113] Therefore, the reliable transmission ratio range of the NW+NGW combined two-stage reducer is 70-100, which far exceeds that of the NGW+NGW combined two-stage reducer transmission scheme.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A compact, high-torque two-stage reducer for a vehicle's active stabilizer bar, characterized in that: Includes housing, primary planetary gear train, secondary planetary gear train, sealing assembly, and output flange; The primary planetary gear train and the secondary planetary gear train are installed in the housing, with the primary sun gear of the primary planetary gear train serving as the input end; The output flange is connected to the second-stage planetary carrier of the second-stage planetary gear train, and the output flange serves as the output end; The primary planetary carrier and the secondary sun gear of the primary planetary gear train are fixedly connected, so that the rotation of the primary sun gear drives the output flange to rotate. The sealing assembly seals the primary planetary gear train and the secondary planetary gear train within the housing; The primary planetary gear train includes a primary planet carrier, a primary sun gear, a primary ring gear, and a double gear set; The first-stage sun gear is located at the center of the double gear set; the first-stage planetary carrier is used to mount the double gear set, the first-stage ring gear is installed inside the housing, and the double gear set meshes with the internal teeth of the first-stage ring gear and the first-stage sun gear respectively; The secondary planetary gear train includes a secondary planetary carrier, a secondary sun gear, a secondary screw, a secondary planetary gear set, tapered roller bearings, angular contact bearings, nut washers, and lock nuts; The secondary screw is connected to the center of the primary planetary carrier via the secondary sun gear to form an integrated structure; The secondary planetary carrier is divided into a secondary carrier body and a mating part. The secondary carrier body is used to install the secondary planetary gear set. The inner wall of the housing is provided with secondary internal teeth at the position corresponding to the secondary planetary gear set. The secondary planetary gear set meshes between the secondary internal teeth of the housing and the secondary sun gear. The tapered roller bearing is positioned between the secondary screw and the inner wall of the secondary planetary carrier; The angular contact bearing is disposed between the outer wall of the secondary planetary carrier and the inner wall of the housing; The locking nut is threaded to the threaded end of the secondary screw to lock the tapered roller bearing; a locking washer is provided between the locking nut and the tapered roller bearing.

2. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 1, characterized in that: The double gear set includes three double gear bodies, which are evenly installed in the first-stage planetary carrier; the double gear body includes a large gear and a small gear. The primary sun gear is positioned between and meshes with the three large gears; The three pinions mesh with the internal teeth of the first-stage gear ring.

3. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 1, characterized in that: The secondary planetary gear set includes three evenly distributed secondary planetary gear bodies A and one secondary planetary gear body B, wherein the secondary planetary gear body A is a conventional planetary gear structure; The secondary planetary gear body B includes a first gear, a second gear, a C-type spring, a needle roller bearing, and a support rod; the inner surfaces of the first gear and the second gear are both provided with C-type grooves, and the C-type spring is installed between the two C-type grooves, so that the first gear and the second gear are misaligned, and the centers of their tooth grooves are angularly different. The support rod is connected to the first gear and the second gear through a needle roller bearing. Locking pins are also provided at both ends of the support rod to ensure that the first gear and the second gear are in close contact. The first gear and the second gear mesh with the secondary internal gear and the secondary sun gear of the housing, respectively.

4. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 1, characterized in that: The interior of the mating part is stepped, including a small circular segment and a large circular segment. One end of the small circular segment is provided with a boss, and the other end is provided with an internal thread. A stepped structure is formed between the secondary sun gear and the secondary screw. The boss and stepped structure respectively limit the position of one end of the tapered roller bearing. By setting the No. 1 locking external gear ring to be connected to the internal thread of the small circular segment, the No. 1 locking external gear ring and the locking nut together achieve the locking of the tapered roller bearing.

5. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 1, characterized in that: The secondary planetary carrier has an external thread near the end outer wall. By setting a second locking internal gear ring to connect with the external thread of the secondary planetary carrier, the locking of the diagonal contact bearing is achieved.

6. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 4, characterized in that: The sealing assembly includes an oil seal seat, an oil seal ring, an external sealing toothed ring, a sealing cap, and a retaining ring; The oil seal seat is disposed inside the housing and contacts the outer ring of the angular contact bearing. A sealing ring is provided between the oil seal seat and the housing. The oil seal ring is disposed between the oil seal seat and the secondary planetary carrier. The inner wall of the housing end is provided with internal threads. The sealing external gear ring is connected to the internal threads of the inner wall of the housing end, thereby achieving the pressing of the oil seal seat and the oil seal ring. The sealing cap is located on the large circular section of the mating part, and a sealing ring is provided between the sealing cap and the large circular section. The large circular section is also provided with a groove, and a retaining ring is installed into the groove to lock the sealing ring.

7. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 1, characterized in that: The output flange is connected to the end face of the secondary planetary carrier by bolts.

8. A compact high-torque two-stage reducer for a vehicle active stabilizer bar according to claim 7, characterized in that: The end face of the secondary planetary carrier is provided with a spline, and the end face of the output flange is also provided with a spline. The splines of the two work together to achieve limit fixation.

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