CN-121497786-B - Compact high-torque secondary speed reducer for vehicle active stabilizer bar

CN121497786BCN 121497786 BCN121497786 BCN 121497786BCN-121497786-B

Abstract

The invention provides a compact high-torque secondary speed reducer for a vehicle driving stabilizer bar, which comprises a shell, a primary planetary gear train, a secondary planetary gear train, a sealing assembly and an output flange, wherein the primary planetary gear train and the secondary planetary gear train are installed in the shell, a primary sun gear of the primary planetary gear train is used as an output end, the output flange is connected with a secondary planet carrier of the secondary planetary gear train, the output flange is used as an output end, the primary planet carrier of the primary planetary gear train is fixedly connected with a secondary sun gear of the secondary planet carrier, the primary sun gear rotates to drive the output flange to rotate, and the sealing assembly seals the primary planetary gear train and the secondary planetary gear train in the shell. The invention can solve the problems of low torque density, long axial dimension, insufficient torsional rigidity and the like of the traditional active stabilizer bar driving system.

Inventors

LI GUOZHI
XUE RUI
CHEN PEIKAI
JIA ZENG
LI SHITIAN
DING SHUAI
WANG PENG
LIU YONG

Assignees

天津天海同步科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260112

Claims (8)

1. The compact high-torque secondary speed reducer for the vehicle active stabilizer bar is characterized by comprising a shell, a primary planetary gear train, a secondary planetary gear train, a sealing assembly and an output flange; the first-stage planetary gear system and the second-stage planetary gear system are arranged in the shell, and a first-stage sun gear of the first-stage planetary gear system is used as an input end; The output flange is connected with a secondary planet carrier of the secondary planetary gear train and is used as an output end; The first-stage planetary carrier of the first-stage planetary gear train is fixedly connected with the second-stage sun gear of the second-stage planetary carrier, so that the rotation of the first-stage sun gear drives the output flange to rotate; The sealing component is used for sealing the primary planetary gear train and the secondary planetary gear train in the shell; the primary planetary gear train comprises a primary planet carrier, a primary sun gear, a primary gear ring and a duplex gear set; The first-stage planetary carrier is used for installing the duplex gear set, the first-stage gear ring is installed in the shell, and the duplex gear set is meshed with the inner teeth of the first-stage gear ring and the first-stage sun gear respectively; The secondary planetary gear train comprises a secondary planet carrier, a secondary sun gear, a secondary screw, a secondary planetary gear set, a tapered roller bearing, an angular contact bearing, a nut gasket and a locking nut; The secondary screw is connected to the center of the primary planet carrier through a secondary sun gear to form an integrated structure; the secondary planet carrier is divided into a secondary carrier body and a matching part, the secondary carrier body is used for installing a secondary planet wheel set, secondary internal teeth are arranged at the position, corresponding to the secondary planet wheel set, of the inner wall of the shell, and the secondary planet wheel set is meshed between the secondary internal teeth of the shell and the secondary sun wheel; the tapered roller bearing is arranged between the secondary screw and the inner wall of the secondary planet carrier; the angular contact bearing is arranged between the outer wall of the secondary planet carrier and the inner wall of the shell; the locking nut is in threaded connection with threads arranged at the end part of the secondary screw rod to lock the tapered roller bearing, and a locking gasket is arranged between the locking nut and the tapered roller bearing.
2. The compact high torque secondary speed reducer for a vehicle active stabilizer bar of claim 1, wherein said twin gear set comprises three twin gear bodies uniformly mounted in a primary planet carrier; the first-stage sun gear is arranged between the three large gears and meshed with the three large gears, and the three small gears are respectively meshed with the inner teeth of the first-stage gear ring.
3. The compact high-torque secondary reducer for a vehicle active stabilizer bar of claim 1, wherein said secondary planetary gear set comprises 3 secondary planetary gear bodies A and 1 secondary planetary gear body B which are uniformly distributed, said secondary planetary gear body A being of a conventional planetary gear structure; the second-stage planet wheel body B comprises a first gear, a second gear, a C-shaped spring, a needle bearing and a supporting rod, wherein the inner side surfaces of the first gear and the second gear are respectively provided with a C-shaped groove, the C-shaped spring is arranged between the two C-shaped grooves, so that dislocation is formed between the first gear and the second gear, and the centers of tooth grooves of the first gear and the second gear form angle difference; the support rod is connected with the first gear and the second gear through needle bearings, and locking pins are arranged at two ends of the support rod, so that the first gear and the second gear are in close contact; And the first gear and the second gear are respectively meshed with the second internal tooth of the shell and the second sun gear.
4. The compact high-torque secondary speed reducer for the vehicle active stabilizer bar of claim 1, wherein the inside of the matching part is in a stepped hole shape and comprises a small round section and a large round section, one end of the small round section is provided with a boss, the other end of the small round section is provided with an internal thread, and a stepped structure is formed between the secondary sun wheel and the secondary screw; the boss and the step structure respectively realize the limit to tapered roller bearing one end, through setting up the internal thread connection of the outer ring gear of No. one locking and little circle section, the outer ring gear of No. one locking and lock nut realize the locking to tapered roller bearing jointly.
5. The compact high-torque secondary speed reducer for the vehicle active stabilizer bar of claim 1, wherein the outer wall of the secondary planet carrier close to the end part is provided with external threads, and the locking of the diagonal contact bearing is realized by arranging a second locking annular gear to be connected with the external threads of the secondary planet carrier.
6. The compact high torque secondary reduction gear for a vehicle active stabilizer bar of claim 4, wherein the seal assembly comprises an oil seal seat, an oil seal ring, a seal cover and a snap ring; The oil seal seat is arranged in the shell and is in contact with the outer ring of the angular contact bearing, a sealing ring is arranged between the oil seal seat and the shell, the oil seal ring is arranged between the oil seal seat and the secondary planet carrier, the inner wall of the end part of the shell is provided with an internal thread, and the oil seal seat and the oil seal ring are simultaneously pressed through the internal thread connection of the sealed outer gear ring and the inner wall of the end part of the shell; the sealing cover is arranged on the large round section of the matching part, a sealing ring is arranged between the sealing cover and the large round section, a clamping groove is further formed in the large round section, and the clamping ring is installed in the clamping groove to lock the sealing ring.
7. The compact high torque secondary speed reducer for vehicle active stabilizer bar of claim 1, wherein said output flange is connected to an end face of the secondary planet carrier by bolts.
8. The compact high-torque secondary speed reducer for the vehicle active stabilizer bar of claim 7, wherein the end face of the secondary planet carrier is provided with splines, the end face of the output flange is also provided with splines, and the splines of the two are matched with each other to realize limit fixation.

Description

Compact high-torque secondary speed reducer for vehicle active stabilizer bar Technical Field The invention belongs to the field of vehicle chassis control, and particularly relates to a compact high-torque two-stage speed reducer for a vehicle active stabilizer bar. Background The vehicle active stabilizer bar system is a key component for improving the steering stability and the comfort of the automobile, and the motor drives the speed reducer to generate moment opposite to the roll direction of the automobile body so as to inhibit the roll; Most of the existing active stabilizer bars are three-stage NGW planetary reduction, and the transmission efficiency is low, the heat is easy to generate, the axial dimension is long, and the torsional rigidity is low although the large reduction ratio can be realized; a typical NGW planetary gear mechanism includes: Sun gear, central input gear; 3-6 planetary gears which are uniformly distributed and are simultaneously combined with the sun gear and the outer gear ring; A planet carrier, which is a rotating frame for supporting the planet wheels; Gear ring, external or internal tooth fixing/output member; typical NGW planet carrier output scheme ratio parameter tables are shown in table 1 below: table 1: Wherein i is a transmission ratio, zr is the number of teeth of the gear ring, and Zs is the number of teeth of the sun gear; The number of the planet gears is 3, and the maximum speed ratio can reach about 12.5; the number of the planet gears is 4, and the maximum speed ratio can reach about 5; the number of the planet gears is 5, and the maximum speed ratio can reach about 4; The number of the planetary gears is increased, the rotation ratio is limited, the planetary mechanism at the tail end can bear great load during speed reduction, the number of the planetary gears is increased, generally 4-6, in order to share the load, the transmission ratio of the planetary gears is reduced, and therefore, the transmission ratio range of the secondary speed reducer of the NGW is about 36-45. Disclosure of Invention In view of the above, the present invention aims to provide a compact high-torque two-stage speed reducer for a vehicle active stabilizer bar, so as to solve the problems of low torque density, long axial dimension, insufficient torsional rigidity and the like of the existing active stabilizer bar driving system. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: A compact high-torque secondary speed reducer for a vehicle active stabilizer bar comprises a shell, a primary planetary gear train, a secondary planetary gear train, a sealing assembly and an output flange; the first-stage planetary gear system and the second-stage planetary gear system are arranged in the shell, and a first-stage sun gear of the first-stage planetary gear system is used as an input end; The output flange is connected with a secondary planet carrier of the secondary planetary gear train and is used as an output end; The first-stage planetary carrier of the first-stage planetary gear train is fixedly connected with the second-stage sun gear of the second-stage planetary carrier, so that the rotation of the first-stage sun gear drives the output flange to rotate; The sealing assembly seals the primary planetary gear train and the secondary planetary gear train in the shell. Further, the primary planetary gear train comprises a primary planet carrier, a primary sun gear, a primary gear ring and a duplex gear set; The primary planet carrier is used for installing the duplex gear set, the primary gear ring is installed in the shell, and the duplex gear set is meshed with the inner teeth of the primary gear ring and the primary sun gear respectively. Further, the double gear set comprises three double gear bodies which are uniformly arranged in the primary planet carrier, wherein each double gear body comprises a large wheel and a small wheel; the first-stage sun gear is arranged between the three large gears and meshed with the three large gears, and the three small gears are respectively meshed with the inner teeth of the first-stage gear ring. Further, the secondary planetary gear train comprises a secondary planet carrier, a secondary sun gear, a secondary screw, a secondary planetary gear set, a tapered roller bearing, an angular contact bearing, a nut gasket and a locking nut; The secondary screw is connected to the center of the primary planet carrier through a secondary sun gear to form an integrated structure; the secondary planet carrier is divided into a secondary carrier body and a matching part, the secondary carrier body is used for installing a secondary planet wheel set, secondary internal teeth are arranged at the position, corresponding to the secondary planet wheel set, of the inner wall of the shell, and the secondary planet wheel set is meshed between the secondary internal teeth of the shell and the secondary sun wheel; th