阅读说明：本技术 一种中央电机减速驱动桥及装有该驱动桥的车辆 (Central motor deceleration drive axle and vehicle with same ) 是由 丁炜琦 周群辉 刘中锋 高刚刚 郭鸿瑞 于 2018-07-09 设计创作，主要内容包括：本发明涉及一种中央电机减速驱动桥及装有该驱动桥的车辆。驱动桥包括电机总成、差速器总成、减速器总成、桥壳,差速器总成包括差速器壳体和内部齿轮结构部分,差速器壳体通过键与电机总成的转子的内圈连接；差速器总成的两侧输出轴均连接有减速器总成；电机壳体的两端各自连接有桥壳,每侧的减速器总成的固定部分连接在各侧的桥壳上；电机总成、差速器总成和减速器总成的中心轴共轴。本发明电机总成将电能转化成动能带动转子旋转,转子通过键带动差速器总成旋转,从而将扭矩输入到减速器总成上,再通过半轴传递到轮端,以实现整桥动力传递。本发明结构集成度高,轴向尺寸小,占用空间少,便于整车布置,便于安装拆卸,质量轻,系统可靠性好,传递效率高。(The invention relates to a central motor deceleration drive axle and a vehicle provided with the same. The drive axle comprises a motor assembly, a differential assembly, a speed reducer assembly and an axle housing, wherein the differential assembly comprises a differential shell and an internal gear structure part, and the differential shell is connected with an inner ring of a rotor of the motor assembly through a key; output shafts on two sides of the differential assembly are connected with a speed reducer assembly; the two ends of the motor shell are respectively connected with an axle housing, and the fixed part of the reducer assembly on each side is connected to the axle housing on each side; the central shafts of the motor assembly, the differential assembly and the reducer assembly are coaxial. The motor assembly converts electric energy into kinetic energy to drive the rotor to rotate, the rotor drives the differential assembly to rotate through the key, and therefore torque is input to the reducer assembly and is transmitted to the wheel end through the half shaft, and whole-axle power transmission is achieved. The invention has the advantages of high structural integration level, small axial size, small occupied space, convenient arrangement of the whole vehicle, convenient assembly and disassembly, light weight, good system reliability and high transmission efficiency.)

1. A central motor deceleration drive axle comprises a motor assembly (4), a differential assembly (5), a reducer assembly (6) and an axle housing (2), wherein,

the motor assembly (4) comprises a motor shell (7), a stator coil assembly (8) and a rotor (9), the stator coil assembly (8) is arranged on the outer ring of the rotor (9), and the motor shell (7) is arranged on the outer ring of the stator coil assembly (8);

the differential assembly (5) comprises a differential housing (10) and an internal gear structure part, wherein the differential housing (10) is connected with the inner ring of the rotor (9) through a key;

the output shafts on the two sides of the differential assembly (5) are connected with the speed reducer assemblies (6); the two ends of the motor shell (7) are respectively connected with the axle housings (2), and the fixed part of the reducer assembly (6) on each side is connected to the axle housing (2) on each side;

the central shafts of the motor assembly (4), the differential assembly (5) and the speed reducer assembly (6) are coaxial, the motor assembly (4) converts electric energy into kinetic energy to drive the rotor (9) to rotate, the rotor (9) drives the differential assembly (5) to rotate through a key, and therefore torque is input to the speed reducer assembly (6) and is transmitted to a wheel end through a half shaft, and power transmission of the whole axle is achieved.

2. The central motor reduction drive axle according to claim 1, characterized in that the reducer assembly (6) comprises a bearing seat (14), an inner gear ring (16), a planet carrier assembly (15), a planetary gear (17) and a sun gear (18), the planetary gear (17) is mounted on a planetary gear shaft (20) through a bearing (19), the planetary gear shaft (20) is mounted on the planet carrier assembly (15), the planet carrier assembly (15) is mounted on the axle housing (2) through a bearing (21), the bearing seat (14) is mounted on the differential case (10) through a bearing (22), the bearing seat (14) and the inner gear ring (16) are mounted on the axle housing (2) through bolts to form an independent transmission unit, and the sun gear (18) is a power input wheel.

3. The central motor reduction drive axle according to claim 2, characterized in that the bearing support (14) and the ring gear (16) are fixedly connected or are of one-piece construction.

4. The central motor reduction drive axle according to claim 1, characterized in that the internal gear structure of the differential assembly (5) comprises planetary gears (11), side gear shafts (12), the planetary gears (11) being mounted on planetary wheel shafts (13), the planetary wheel shafts (13) being bearing-mounted on the differential case (10), the side gear shafts (12) being the output shafts of the differential assembly (5).

5. The central motor reduction drive axle according to claim 1, characterized in that the output shaft of the differential assembly (5) is of a unitary construction with the input wheel of the reducer assembly (6).

6. Central motor reduction drive axle according to claim 1, characterized in that the stator coil assembly (8) is designed as a plastic encapsulation, the stator coil assembly (8) being provided with cooling means.

7. The central motor deceleration drive axle according to claim 1, characterized in that the oil paths of the motor assembly (4), the differential assembly (5) and the reducer assembly (6) are communicated and are designed to be oil-lubricated, the axle housing (2) is provided with an oil filling hole through which the lubricating oil flows into the mechanism of the reducer assembly (6), and the differential housing (10) is provided with an oil hole through which the lubricating oil flows into the interior of the differential assembly (5).

8. The central motor reduction drive axle according to claim 1, characterized in that the axle housing (2) is connected to the motor housing (7) by means of bolts, the axle housing (2) and the motor housing (7) being radially sealed by means of O-rings.

9. The central motor reduction drive axle according to claim 1, characterized in that the reducer assembly (6) and the axle housing (2) are of a semi-axial coaxial design connected to the wheel ends.

10. A vehicle equipped with a central motor reduction drive axle according to any one of claims 1 to 9, wherein the vehicle is further provided with an on-board controller, the motor assembly (4) converts electric energy into kinetic energy under the action of the on-board controller to drive the rotor (9) to rotate, the rotor (9) drives the differential assembly (5) to rotate through a key, so that torque is input to the reducer assembly (6) through the differential assembly (5) and is transmitted to a wheel end through a half shaft, and the whole axle power transmission is realized.

Technical Field

The invention relates to a vehicle drive axle, in particular to a central motor deceleration drive axle and a vehicle provided with the same.

Background

With continuous progress of science and technology, requirements of customers on efficiency, weight and cost of a vehicle power system are higher and higher, particularly after the national state brings 'fuel consumption of unit load mass' into a subsidized assessment coefficient, pursuit of light weight, high efficiency and low cost of a vehicle is a new aspect, and the traditional electric vehicle scheme obviously cannot meet the requirement through a structure that a step-by-step motor drives a transmission shaft and then power is transmitted to a common axle.

In the field of new energy automobiles, a driving system of an electric automobile usually adopts a side structure with a driving motor and wheel half shafts which are installed in parallel, and when the whole automobile vibrates at a high speed, the reliability of the system is reduced due to the fact that the mass under a whole axle spring is large and the gravity center moves forwards.

Therefore, in order to improve the reliability of the entire system of the vehicle and to achieve the objectives of light weight, high efficiency and low cost, a new design of the transaxle structure is necessary.

Disclosure of Invention

The invention aims to provide a central motor reduction drive axle and a vehicle with the same, so that the integral reliability of a vehicle system is improved, and meanwhile, the drive axle structure is reasonably designed, so that the drive axle structure has the advantages of high integration level, small axial size, small occupied space, convenience in whole vehicle arrangement, convenience in mounting and dismounting, light weight and high transmission efficiency.

The invention provides a central motor speed reduction drive axle which comprises a motor assembly, a differential mechanism assembly, a speed reducer assembly and an axle housing, wherein the motor assembly comprises a motor housing, a stator coil assembly and a rotor, the stator coil assembly is arranged on the outer ring of the rotor, and the motor housing is arranged on the outer ring of the stator coil assembly; the differential assembly includes a differential case and an internal gear structure portion, the differential case being connected with the inner race of the rotor by a key; output shafts on two sides of the differential assembly are connected with the speed reducer assembly; the two ends of the motor shell are respectively connected with the axle housings, and the fixed part of the speed reducer assembly on each side is connected to the axle housing on each side; the central shafts of the motor assembly, the differential assembly and the speed reducer assembly are coaxial, the motor assembly converts electric energy into kinetic energy to drive the rotor to rotate, the rotor drives the differential assembly to rotate through a key, and therefore torque is input to the speed reducer assembly and is transmitted to a wheel end through a half shaft, and whole axle power transmission is achieved.

Furthermore, the reducer assembly comprises a bearing seat, an inner gear ring, a planet carrier assembly, a planetary gear and a sun gear, wherein the inner gear ring is matched with the planetary gear, the planetary gear is matched with the sun gear, and the number of the planetary gears can be multiple, preferably two. The planetary gears are mounted on planetary gear shafts through bearings, and the number of the planetary gear shafts is matched with that of the planetary gears. The planet wheel shaft is arranged on the planet carrier assembly, the planet carrier assembly is arranged on the axle housing through a bearing, the bearing seat is arranged on the differential mechanism shell through a bearing, the bearing seat and the inner gear ring are arranged on the axle housing through bolts to form an independent transmission unit, and the sun wheel is a power input wheel.

In the structure, the bearing seat and the inner gear ring are fixedly connected or are in an integral structure.

Furthermore, the internal gear structure part of the differential assembly comprises a planetary gear and a half axle gear shaft, the planetary gear is matched with the half axle gear shaft, the planetary gear is arranged on a planetary gear shaft, the planetary gear shaft is arranged on the differential shell through a bearing, and the half axle gear shaft is an output shaft of the differential assembly.

In the above structure, the output shaft of the differential assembly and the input wheel of the reducer assembly may be an integral structure.

Further, the stator coil assembly is designed to be of a plastic package structure. The stator coil assembly is also provided with a cooling device which can be cooled through liquid cooling. The liquid cooling medium includes water, glycol, etc.

In the central motor reduction drive axle, the motor assembly, the differential assembly and the reducer assembly can be designed to be communicated with each other through oil passages, an oil lubrication design is uniformly adopted, an oil filling hole can be formed in the axle housing, lubricating oil flows into the reducer assembly mechanism through the oil filling hole, an oil hole is formed in the differential housing, and the lubricating oil flows into the interior of the differential assembly through the oil hole.

Foretell central motor speed reduction transaxle, the axle housing pass through the bolt with motor casing is connected, radially seal with O type circle between axle housing and the motor casing to prevent the oil leak.

In the central motor speed reduction drive axle, the speed reducer assembly and the axle housing are in a semi-axle coaxial design and are connected with the wheel end.

The invention further provides a vehicle provided with the central motor speed reduction drive axle, wherein the vehicle is also provided with an on-board controller, the motor assembly converts electric energy into kinetic energy under the action of the on-board controller to drive the rotor to rotate, the rotor drives the differential assembly to rotate through a key, so that torque is input to the speed reducer assembly through the differential assembly and is transmitted to a wheel end through a half shaft, and the whole axle power transmission is realized.

The invention provides a novel coaxial central motor drive axle and a vehicle provided with the same, aiming at the defects of the existing product in the application process, and provides a coaxial axle structure which is formed by coaxially, skillfully and reasonably mounting a drive motor, a gear reduction structure and a differential mechanism on an axle housing, and can be widely applied to a drive unit of a vehicle, in particular an electric automobile.

The drive axle has the advantages of compact integral structure, small axial size, small occupied space, convenience for arrangement of the whole automobile, high transmission efficiency, light weight and reasonable gravity center design, and improves the reliability of the whole axle; the axle housing adopts a split type design and is detachably connected with the motor shell, so that the structural flexibility is improved; the speed reduction transmission part is detachably connected with the axle housing, so that the speed reduction transmission part can be independently used, the disassembly and the assembly are convenient, and the interchangeability is enhanced; the motor has the advantages that the rotor of the motor is matched and connected with the differential mechanism key, so that power is effectively transmitted, the structure is ingenious, the occupied space is small, and the transmission efficiency is high; the stator part of the motor is in a plastic package structure, so that oil lubrication is facilitated, the safe use of the system is guaranteed, and the service life of the system is prolonged.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure for mounting a central motor reduction drive axle according to the present invention;

FIG. 2 is a longitudinal sectional view of the central motor reduction drive axle of the present invention.

The reference numbers illustrate:

1 is a wheel end; 2 is an axle housing; 3 is the collection of a motor assembly, a differential assembly, a reducer assembly and the like;

4 is a motor assembly; 5 is a differential assembly; 6 is a reducer assembly; 7 is a motor shell; 8 is a stator coil assembly; 9 is a rotor; 10 is a differential case; 11 is a planetary gear; 12 is a half axle gear shaft; 13 is a planet wheel shaft; 14 is a bearing seat; 15 is a planet carrier assembly; 16 is an inner gear ring; 17 is a planetary gear; 18 is a sun gear; 19 is a bearing; 20 is a planet wheel shaft; 21 is a bearing; 22 are bearings.

Detailed Description

To facilitate understanding and implementing the invention by those of ordinary skill in the art, embodiments of the invention are now described with reference to the drawings.

The schematic perspective structure of the central motor speed reduction drive axle installation of the invention is shown in figure 1, wherein a part 1 is a wheel end, a part 2 is an axle housing, and a part 3 is a set of a motor assembly, a differential assembly, a speed reducer assembly and the like.

The longitudinal section structure of the central motor speed reducing drive axle of the invention is schematically shown in figure 2. A coaxial central motor speed reduction drive axle mainly comprises a motor assembly 4, a differential assembly 5, a speed reducer assembly 6 and an axle housing 2. A differential assembly 5 is arranged in the motor assembly 4, and output shafts on two sides of the differential assembly 5 are connected with a speed reducer assembly 6. The axle housing 2 is arranged at the periphery of both ends.

The motor assembly 4 mainly comprises a motor housing 7, a stator coil assembly 8 and a rotor 9, wherein the stator coil also comprises a cooling device. The cooling device may cool the motor by liquid cooling. The liquid cooling medium includes water, glycol, etc. The cooling device of the present embodiment is preferably a water jacket. A stator coil assembly 8 is arranged on the outer ring of the rotor 9, and a motor shell 7 is arranged on the outer ring of the stator coil assembly 8. The stator coil assembly 8 is in clearance fit with the motor shell 7, a key groove is designed on the inner side of the rotor 9, and an air gap is designed on the rotor 9 and the stator coil assembly 8.

The differential assembly 5 includes a differential case 10, planetary gears 11, and side gear shafts 12, the planetary gears 11 and the side gear shafts 12 cooperate, the number of the planetary gears 11 may be plural, and the embodiment is preferably two. The left side and the right side of the differential assembly 5 are respectively provided with a half axle gear shaft 12. The planetary gear 11 is mounted on a planetary shaft 13, and the planetary shaft 13 is mounted on the differential case 10 through a bearing. A key groove is designed on the outer side of the differential shell 10; the rotor 9 and the differential housing 10 are keyed to transmit torque. The side gear shaft 12 is an output shaft of the differential assembly 5.

The reducer assembly 6 comprises a bearing seat 14, a planet carrier assembly 15, an inner gear ring 16, a planetary gear 17 and a sun gear 18. The ring gear 16 cooperates with planet gears 17, which planet gears 17 in turn cooperate with a sun gear 18, which planet gears 17 can be provided in plurality, preferably in two. The planetary gear 17 is mounted on a planetary shaft 20 through a bearing 19, and the planetary shaft 20 is mounted on the planet carrier assembly 15. The sun gear 18 and the side gear shaft 12 may be designed as one piece. The planet carrier assembly 15 is mounted on the axle housing 2 at one end by a bearing 21 and on the bearing block 14 at the other end by a bearing, the bearing block 14 being mounted on the differential case 10 by a bearing 22. The bearing block 14 and the inner gear ring 16 can be mounted on the axle housing 2 through bolts, so that the reducer assembly 6 forms an independent transmission unit. The bearing seat 14 and the inner gear ring 16 can be designed to be an integrated structure, and can also be designed to be separated and connected by bolts. The transmission unit can be used independently and is suitable for integrated structures of different motors and speed reducers.

In this central motor reduction drive axle structure, stator and solenoid assembly 8 design are the plastic envelope structure, can unify and adopt the oil lubrication design, can be linked together motor assembly 4, differential mechanism assembly 5, the oil circuit of reduction gear assembly 6, refuels from the tank filler opening of axle housing 2, and during lubricating oil flowed into planetary reduction mechanism, the design has the oilhole on differential mechanism casing 10, and inside lubricating oil flowed into differential mechanism assembly 5 through the oilhole, lubricated planetary gear 11 and semi-axis gear axle 12.

In the present embodiment, the axle housing 2 is connected to each end of the motor housing 7, and the fixed portion of the speed reducer assembly 6 on each side is connected to the axle housing 2 on each side. Axle housing 2 is connected with motor casing 7 through the bolt, and radially seals with O type circle between axle housing 2 and the motor casing 7, prevents the risk of oil leak.

The central shafts of the motor assembly 4, the differential assembly 5 and the reducer assembly 6 are coaxial.

The output shaft of the differential assembly 5 and the input wheel of the reducer assembly 6 are of an integral structure. In particular, as previously mentioned, the sun gear 18 and the side gear shaft 12 may be designed as one piece.

The invention relates to a reducer assembly 6 and a half shaft coaxial design connected with a wheel end in an axle housing 2.

When the central motor speed reduction drive axle works, the motor assembly 4 converts the electric energy of a storage battery into kinetic energy under the action of an on-board controller to drive the rotor 9 to rotate, the rotor 9 drives the differential assembly 5 to rotate through a key, so that the torque is input to the sun gear 18 of the speed reducer assembly 6 through the half shaft gear shaft 12 and is transmitted to the planet carrier through the planetary gear and the inner gear ring, and the planet carrier is connected with the half shaft through the spline and is transmitted to the wheel end through the half shaft, so that the whole axle power transmission is realized.

In the embodiment, the speed ratio range of the deceleration is 6-25; the rated load of the whole bridge is 2000-13000 kg.

In the present embodiment, the output torque is 2000n.m to 20000 n.m.

The coaxial axle of the invention can be widely applied to the driving unit of vehicles such as electric automobiles. The vehicle provided with the central motor speed reduction drive axle is also provided with an on-board controller, the motor assembly converts electric energy into kinetic energy under the action of the on-board controller to drive the rotor to rotate, the rotor drives the differential assembly to rotate through a key, so that torque is input to the speed reducer assembly through the differential assembly and is transmitted to a wheel end through a half shaft, and the whole axle power transmission is realized.

The drive axle has the advantages of compact integral structure, small axial size, small occupied space, convenience for arrangement of the whole automobile, high transmission efficiency, light weight and reasonable gravity center design, and improves the reliability of the whole axle; the axle housing adopts a split type design and is detachably connected with the motor shell, so that the structural flexibility is improved; the speed reduction transmission part is detachably connected with the axle housing, so that the speed reduction transmission part can be independently used, the disassembly and the assembly are convenient, and the interchangeability is enhanced; the motor has the advantages that the rotor of the motor is matched and connected with the differential mechanism key, so that power is effectively transmitted, the structure is ingenious, the occupied space is small, and the transmission efficiency is high; the stator part of the motor is in a plastic package structure, so that oil lubrication is facilitated, the safe use of the system is guaranteed, and the service life of the system is prolonged.

Although the present invention has been described with reference to the embodiments, those skilled in the art will appreciate that many variations and modifications can be made without departing from the spirit and scope of the invention as defined in the appended claims.