CN111347857A

CN111347857A - Electric drive axle and vehicle

Info

Publication number: CN111347857A
Application number: CN201811585272.7A
Authority: CN
Inventors: 李国选
Original assignee: Beiqi Foton Motor Co Ltd
Current assignee: Beiqi Foton Motor Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-06-30

Abstract

The utility model relates to an electric drive axle and vehicle, this electric drive axle includes transaxle casing and driving motor, and driving motor sets up in the transaxle casing, and driving motor is external rotor electric machine, and external rotor electric machine includes stator and rotor, the stator be located the inside of rotor and with transaxle casing fixed connection, have the clearance between rotor and the transaxle casing. The driving is carried out by adopting the mode of the outer rotor motor, a certain gap exists between the rotor of the driving motor and the driving shell, and the influence of the deformation of the driving axle shell on the air gap between the rotor and the stator of the driving motor is avoided.

Description

Electric drive axle and vehicle

Technical Field

The present disclosure relates to the field of vehicle technology, and in particular, to an electric drive axle and a vehicle.

Background

Along with pure electric vehicles's development, electric drive system has appeared gradually to the trend that integrates, high efficiency, the direction development of compactification, and in pure electric vehicles field, traditional drive mode is arranged in solebar inboard for driving motor, is connected with traditional rear drive axle through gearbox and transmission shaft, and driving motor and gearbox need special suspension system, and whole electric drive system is heavy in weight, transmission chain length, lead to that transmission efficiency is low, whole car quality is big.

The integrated electric drive axle is a structure integrating a drive motor and a transmission on a rear drive axle, and compared with the traditional arrangement mode, the integrated electric drive axle cancels a transmission shaft and a motor suspension, lightens the weight of an electric drive system, improves the transmission efficiency, and vacates the space on the inner side of a frame for arranging other electric appliance parts. The integrated electric drive axle scheme of current coaxial-type mainly divide into two kinds, one is that driving motor is coaxial with the wheel axis, through the speed reduction of cylindrical gear mechanism, another one is that driving motor and wheel axial are coaxial, through the speed reduction of planet wheel mechanism, driving motor of these two kinds of modes all chooses driving motor to drive for the rotatory mode of inner rotor, motor stator and transaxle casing fixed connection, transaxle casing and motor casing are integrated, the casing warp after the transaxle receives the load, and outer stator links to each other with the casing, and then outer stator can follow the deformation of casing and take place the change on the position, thereby lead to the air gap between outer stator and the inner rotor to diminish, cause the driving motor moment of torsion, the noise, a series of problems such as control.

Disclosure of Invention

The purpose of this disclosure is to provide an electric drive axle, this electric drive axle adopts external rotor motor as driving motor, can not produce the problem that the air gap between the rotor of driving motor and the stator diminishes.

In order to achieve the above object, the present disclosure provides an electric drive axle, which includes a drive axle housing and a drive motor, wherein the drive motor is disposed in the drive axle housing, the drive motor is an external rotor motor, the external rotor motor includes a stator and a rotor, the stator is located inside the rotor and is fixedly connected to the drive axle housing, and a gap is formed between the rotor and the drive axle housing.

Optionally, the electric drive axle further includes a differential, a first output shaft, a second output shaft, a first speed reduction mechanism, a second speed reduction mechanism, and a third speed reduction mechanism, the rotor is connected to the housing of the differential through the first speed reduction mechanism, the first half shaft of the differential is connected to the first output shaft through the second speed reduction mechanism, and the second half shaft of the differential is connected to the third output shaft through the third speed reduction mechanism.

Optionally, the first reduction mechanism is a double-stage planetary reduction mechanism, and the double-stage planetary reduction mechanism includes a first sun gear, a first planet carrier, a first internal planet gear, a first external planet gear, and a first gear ring, the first internal planet gear is engaged with the first external planet gear, the first internal planet gear is engaged with the first sun gear, the first external planet gear is engaged with the first gear ring, the first internal planet gear and the first external planet gear are both mounted on the first planet carrier, the first planet carrier is connected with the rotor, the first sun gear is fixedly connected with the drive axle housing, and the first gear ring is connected with the housing of the differential.

Optionally, the second speed reduction mechanism is a planetary gear speed reduction mechanism, the second speed reduction mechanism includes a second sun gear, a second planetary gear, a second planet carrier and a second gear ring, the first half shaft of the differential is connected with or integrated with the second sun gear, the second planet carrier is connected with the first output shaft, and the second gear ring is fixedly connected with the drive axle housing.

Optionally, the third reduction gear is a planet gear reduction gear, the third reduction gear includes a third sun gear, a third planet carrier and a third ring gear, a second half shaft of the differential is connected with or integrated with the third sun gear, the third planet carrier is connected with the second output shaft, and the third ring gear is fixedly connected with the drive axle housing.

Alternatively, the differential and the third reduction mechanism are disposed on both sides of the drive motor, respectively, and the second half shaft of the differential passes through the stator of the drive motor to be connected to the third reduction mechanism.

Optionally, the differential is disposed between the drive motor and the first reduction mechanism.

Optionally, the drive axle housing is divided into multiple sections along the axial direction, and the two adjacent sections are connected through a fastener.

Optionally, the driving axle housing includes a first section, a second section and a third section, the first section is located between the second section and the third section, the driving motor and the first speed reduction mechanism are located in the first section, the differential and the second speed reduction mechanism are located in the second section, and the third speed reduction mechanism is located in the third section.

The present disclosure also provides a vehicle including the electric drive axle.

The beneficial effect of this disclosure:

the driving is carried out by adopting the mode of the outer rotor motor, a certain gap exists between the rotor of the driving motor and the driving shell, and the influence of the deformation of the driving axle shell on the air gap between the rotor and the stator of the driving motor is avoided.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic structural view of an electric drive axle of an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a first reduction mechanism and a drive motor rotor of an electric transaxle according to an embodiment of the present disclosure;

fig. 3 is a partial structural schematic view of a first reduction mechanism of an electric transaxle of one embodiment of the present disclosure;

fig. 4 is a schematic structural view of a second reduction mechanism and a first output shaft of an electric transaxle according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of a third reduction mechanism and a second output shaft of an electric transaxle according to an embodiment of the present disclosure.

Description of the reference numerals

1 drive axle housing 2 drive motor

3 differential 4 first output shaft

5 second output shaft 6 first reduction gear

7 second reduction gear mechanism 8 third reduction gear mechanism

11 first section 12 second section

13 third stage 21 stator

22 first half-shaft of rotor 31

32 second axle shaft 84 third ring gear

61 first sun gear 62 first planet carrier

63 first planetary internal gear 64 first planetary external gear

65 first ring gear 83 third planet carrier

72 second planet wheels 73 second planet carrier

74 second ring gear 82 third planetary gear

71 second sun gear 81 third sun gear

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

As shown in fig. 1 to 5, the present disclosure provides an electric drive axle, which includes a drive axle housing 1 and a drive motor 2, wherein the drive motor 2 is disposed in the drive axle housing 1, the drive motor 2 may be an outer rotor motor, the outer rotor motor includes a stator 21 and a rotor 22, the stator 21 is located inside the rotor 22 and is fixedly connected with the drive axle housing 1, two ends of the rotor 22 are supported on the stator 21, and a gap is provided between the rotor 22 and the drive axle housing 1. The drive axle shell 1 plays a role in protecting the internal structure, the shell of the drive motor 2 can be integrated on the drive axle shell 1, cost and materials are effectively saved, and a certain weight reduction effect can be achieved. When the drive axle housing 1 is deformed by a load, the drive axle housing 1 is deformed, and the outer stator is directly connected with the drive axle housing 1 without a gap in the prior art, and when the drive axle housing 1 is deformed by a load, the outer stator can change in position along with the drive axle housing 1, so that the change of an air gap between the outer stator and the inner rotor (the air gap between the stator and the rotor of the drive motor is small and generally smaller than 1mm) is caused, the problems of torque, control and the like of the drive motor 2 are caused, and large noise can be generated. On the one hand, the driving torque is larger, a gap is formed between the rotor 22 and the drive axle housing 1, and the rotor 22 does not contact with the drive axle housing 1 after the drive axle housing 1 deforms. On the other hand, a bearing seat is fixed on the drive axle housing 1, the stator 21 is installed on the bearing seat of the drive axle housing 1 through a bearing, two bearing seats can be arranged on the stator 21, and two ends of the rotor 22 can be installed on the bearing seats through two bearings, so that after the drive axle housing 1 is deformed by a load, the stator 21 and the rotor 22 can change in position along with the drive axle housing 1, an air gap between the stator 21 and the rotor 22 can not change, and the problems of torque, control and the like of the drive motor 2 are avoided.

Specifically, as shown in fig. 1, the electric drive axle may further include a differential 3, a first output shaft 4, a second output shaft 5, a first speed reduction mechanism 6, a second speed reduction mechanism 7, and a third speed reduction mechanism 8, where the differential 3 may enable two driving wheels of the vehicle to be driven at different rotation speeds, the first output shaft 4 and the second output shaft 5 are respectively connected to the two driving wheels to provide power, the first speed reduction mechanism 6 is a first-stage speed reduction mechanism, the second speed reduction mechanism 7 and the third speed reduction mechanism 8 are second-stage speed reduction mechanisms, and a speed reduction ratio may be increased through speed reduction of the two-stage speed reduction mechanisms, so as to increase an output torque. The rotor 22 transmits power to the first speed reducing mechanism 6 to perform first-stage speed reducing and torque increasing processing, then the output end of the first speed reducing mechanism 6 is connected with the shell of the differential mechanism 3, the differential mechanism 3 is driven to work through the rotation of the shell of the differential mechanism 3, the first half shaft 31 of the first output end of the differential mechanism 3 is connected with the first output shaft 4 through the second speed reducing mechanism 7, the second half shaft 32 of the second output end of the differential mechanism 3 is connected with the second output shaft 5 through the third speed reducing mechanism 8, and the first output shaft 4 and the second output shaft 9 further transmit the power to the driving wheel of the vehicle, so that the driving of the vehicle is realized.

As an alternative embodiment, as shown in fig. 1 and 2, the first reduction mechanism 6 is a double-stage planetary reduction mechanism including a first sun gear 61, a first planet carrier 62, a first internal planet gear 63, a first external planet gear 64, and a first ring gear 65, the first internal planet gear 63 and the second external planet gear 64 are both connected to the first planet carrier 62, the first planet carrier 62 is connected to the rotor 21, the first sun gear 61 is fixedly connected to the transaxle housing 1, and the first ring gear 65 is connected to the housing of the differential 3. First, the first planet carrier 62 is connected to the rotor 22 of the driving motor 2 as the input end of the power of the first speed reducing mechanism 6, and then the power is transmitted to the first internal planet gear 63 and the first external planet gear 64, where the reduction ratio can be further increased and the torque can be increased by using the double-stage planet gears. The first external planetary gear 64 meshes with the first ring gear 65 and drives the first ring gear 65 to rotate, the first ring gear 65 serves as an output end of power of the first speed reduction mechanism 6 and is connected with a housing of the differential 3 so as to transmit the power to the differential 3, and the first sun gear 61 is always in a locked state fixedly connected with the drive axle housing 1 in the whole speed reduction process of the first speed reduction mechanism 6. However, the first reduction mechanism 6 is not limited to the double planetary reduction mechanism, and other types of reduction mechanisms may be used.

As an alternative, as shown in fig. 1 and 4, the second speed reduction mechanism 7 may be a planetary gear speed reduction mechanism, the second speed reduction mechanism 7 includes a second sun gear 71, a second planetary gear 72, a second planet carrier 73 and a second ring gear 74, the first half shaft 31 of the differential 3 is connected with or integrated with the second sun gear 71, the second planet carrier 73 is connected with the first output shaft 4, and the second ring gear 74 is fixedly connected with the drive axle housing 1. The first half shaft 31 of the differential 2 serves as an input end of power of the second speed reduction mechanism 7 and drives the second sun gear 71 to rotate, the second sun gear 71 is meshed with the second planet gear 72 and drives the second planet gear 72 to rotate, the second ring gear 74 is in a locking state fixedly connected with the drive axle housing 1, the second planet gear 72 drives the second planet carrier 73 to rotate, and the second planet carrier 73 serves as an output end of power and is connected with the first output shaft 4, so that the power is transmitted to the drive wheel. However, the second reduction mechanism 7 is not limited to the planetary reduction mechanism, and other types of reduction mechanisms may be used.

As an alternative, as shown in fig. 1 and 5, the third speed reduction mechanism 8 may also be a planetary speed reduction mechanism, the third speed reduction mechanism 8 includes a third sun gear 81, a third planetary gear 82, a third planet carrier 83 and a third ring gear 84, the second half shaft 32 of the differential 3 is connected with or integrated with the third sun gear 81, the third planet carrier 83 is connected with the second output shaft 5, and the third ring gear is fixedly connected with the transaxle housing 1. The second half shaft 32 of the differential 3 serves as an input end of power of the third speed reduction mechanism 8 and drives the third sun gear 81 to rotate, the third sun gear 81 drives the third planet gear 82 to rotate, the third ring gear 84 is in a locking state fixedly connected with the drive axle housing 1, the third planet gear 82 drives the third planet carrier 83 to rotate, the third planet carrier 83 serves as an output end of power of the third speed reduction mechanism 8 and is connected with the second output shaft 5, and then the power is transmitted to the driving wheel through the second output shaft 5.

Specifically, as shown in fig. 1, the differential 3 and the third reduction mechanism 8 are respectively disposed on both sides of the drive motor 2, the second half shaft 32 of the differential 3 passes through the stator 21 of the drive motor 2 to be connected to the third reduction mechanism 8, and the differential 3 is disposed between the drive motor 2 and the first reduction mechanism 6, thereby making the overall structure more compact and improving the utilization ratio of the arrangement space.

In addition, transaxle casing 1 can divide into the multistage along the axial, can connect through the fastener between two adjacent sections, for example can adopt bolt fixed connection's mode to connect, conveniently dismantles the maintenance. However, the fasteners are not limited to bolts and other types of fasteners may be used for attachment.

Further, as shown in fig. 1, the transaxle housing 1 may include a first section 11, a second section 12, and a third section 13, where the first section 11 is located between the second section 12 and the third section 13, and both ends may be fixedly connected to the second section 12 and the third section 13 by bolts. The drive motor 2 and the first reduction mechanism 6 may be located in the first stage 11, the differential 3 and the second reduction mechanism 7 may be located in the second stage 12, and the third reduction mechanism 8 may be located in the third stage 13. The protection is effectively achieved, and meanwhile, the disassembly and the maintenance are convenient.

The present disclosure also provides a vehicle including the electric drive axle described above.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An electric drive axle, characterized in that, the electric drive axle includes drive axle casing (1) and driving motor (2), driving motor (2) set up in drive axle casing (1), driving motor (2) are external rotor motor, external rotor motor includes stator (21) and rotor (22), stator (21) are located the inside of rotor (22) and with drive axle casing (1) fixed connection, have the clearance between rotor (22) and drive axle casing (1).

2. The electric drive axle according to claim 1, characterized in that it further comprises a differential (3), a first output shaft (4), a second output shaft (5), a first reduction mechanism (6), a second reduction mechanism (7) and a third reduction mechanism (8), said rotor (22) being connected to the housing of said differential (3) through said first reduction mechanism (6), a first half-shaft (31) of said differential (3) being connected to said first output shaft (4) through said second reduction mechanism (7), a second half-shaft (32) of said differential (3) being connected to said second output shaft (5) through said third reduction mechanism (8).

3. The electric drive axle according to claim 2, characterized in that the first reduction mechanism (6) is a double-stage planetary reduction mechanism comprising a first sun gear (61), a first planet carrier (62), a first internal planet gear (63), a first external planet gear (64) and a first ring gear (65), the first internal planet gear (63) meshing with the first external planet gear (64), the first internal planet gear (63) meshing with the first sun gear (61), the first external planet gear (64) meshing with the first ring gear (65), the first internal planet gear (63) and the first external planet gear (64) both being mounted on the first planet carrier (62), the first planet carrier (62) being connected to the rotor (22), the first sun gear (61) being fixedly connected to the drive axle housing (1), the first ring gear (65) is connected to a housing of the differential (3).

4. The electric drive axle according to claim 2, characterized in that the second reduction mechanism (7) is a planetary reduction mechanism, the second reduction mechanism (7) comprising a second sun gear (71), second planetary gears (72), a second planet carrier (73) and a second ring gear (74), the first half shaft (31) of the differential (3) being connected to or formed in one piece with the second sun gear (71), the second planet carrier (73) being connected to the first output shaft (4), the second ring gear (74) being fixedly connected to the drive axle housing (1).

5. The electric transaxle of claim 2 wherein the third reduction mechanism (8) is a planetary reduction mechanism, the third reduction mechanism (8) comprising a third sun gear (81), a third planet gear (82), a third planet carrier (83) and a third ring gear (84), the second half shaft (32) of the differential (3) being connected to or formed integrally with the third sun gear (81), the third planet carrier (83) being connected to the second output shaft (5), the third ring gear (84) being fixedly connected to the transaxle housing (1).

6. The electric drive axle according to claim 2, characterized in that the differential (3) and the third reduction mechanism (8) are arranged on both sides of the drive motor (2), respectively, and the second half shaft (32) of the differential (3) passes through the stator (21) of the drive motor (2) to be connected to the third reduction mechanism (8).

7. The electric drive axle according to claim 2, characterized in that the differential (3) is arranged between the drive motor (2) and the first reduction mechanism (6).

8. Electric drive axle according to claim 2, characterized in that the drive axle housing (1) is divided axially into sections, with adjacent sections being connected by fasteners.

9. The electric drive axle according to claim 8, characterized in that the drive axle housing (1) comprises a first section (11), a second section (12) and a third section (13), the first section (11) being located between the second section (12) and the third section (13), the drive motor (2) and the first reduction mechanism (6) being located in the first section (11), the differential (3) and the second reduction mechanism (7) being located in the second section (12), and the third reduction mechanism (8) being located in the third section (13).

10. A vehicle, characterized by comprising an electric drive axle according to any one of the preceding claims 1-9.