CN114312269A

CN114312269A - Double-motor stepless speed regulation electric drive axle

Info

Publication number: CN114312269A
Application number: CN202210101222.7A
Authority: CN
Inventors: 李吉元; 冯光军; 石彦辉; 王明成; 李晋; 高子茵; 石晓翔; 王亚军; 王威; 马超飞
Original assignee: Beijing North Vehicle New Technology Incubator Co ltd
Current assignee: Beijing North Vehicle New Technology Incubator Co ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-04-12

Abstract

The invention discloses a double-motor stepless speed regulation electric drive axle, which relates to the field of machinery and vehicle transmission and comprises a first drive motor, a second drive motor, a speed reduction mechanism and a differential mechanism, wherein output shafts of the first drive motor and the second drive motor are on the same axis, the speed reduction mechanism comprises a box body, a first planet row, a second planet row and a first-stage speed reduction gear, the first planet row, the second planet row and the first-stage speed reduction gear are arranged in the box body, the first drive motor is in driving connection with the first planet row, the second drive motor is in driving connection with the second planet row, the first planet row is in meshing connection with the second planet row, the first planet row is in driving connection with the first-stage speed reduction gear, and the first-stage speed reduction gear is in driving connection with the differential mechanism. The invention has compact structure and small volume, and can realize stepless speed change through double motors and double planet rows.

Description

Double-motor stepless speed regulation electric drive axle

Technical Field

The invention relates to the field of machinery and vehicle transmission, in particular to a double-motor stepless speed regulation electric drive axle.

Background

The transaxle is as a common drive mechanism, the wide application is in the transmission field of machinery and vehicle, for the development that adapts to new energy automobile technique, the electric drive axle by driving motor drive has appeared, electric drive axle on the market is mostly single-gear electric drive axle, it is higher that the low energy consumption of efficiency is low at low-speed, can't satisfy more complicated operation requirement, and two grades of electric drive axle on the market structure is complicated, do not break away from bevel gear main reducer's structural constraint, built-in structure is compact inadequately, therefore the volume often is great, difficult installation is arranged.

Therefore, how to provide an electric drive axle with simple structure, small volume and capability of double-motor stepless speed regulation becomes a problem to be solved by the technical personnel in the field.

Disclosure of Invention

In view of the above, the invention provides a double-motor stepless speed regulation electric drive axle which is simple and compact in structure, saves the overall axial arrangement space of the electric drive axle, and realizes stepless speed change through double motors and double planet rows.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a two motor stepless speed regulation electric drive axles, includes first driving motor, second driving motor, reduction gears and differential mechanism, first driving motor and second driving motor's output shaft is on same axis, reduction gears includes box, first planet row, second planet row and one-level reduction gear, and first planet row, second planet row and one-level reduction gear set up in the box, first driving motor is connected with first planet row drive, second driving motor is connected with second planet row drive, first planet row is connected with one-level reduction gear drive, one-level reduction gear is connected with the differential mechanism drive.

Furthermore, the first-stage reduction gear comprises a first-shaft driving gear and a second-shaft driven gear, an output shaft of the first planet row is fixedly connected with the first-shaft driving gear, and the first-shaft driving gear is meshed with the second-shaft driven gear.

Further, first planet row includes first sun gear, first planetary gear set, first frame and first ring gear, a driving motor's output shaft and first ring gear fixed connection, first ring gear and first planetary gear set meshing connection, first frame are used for fixed first planetary gear set, and first frame rotates with each star gear in the first planetary gear set to be connected, first planetary gear set still is connected with first sun gear meshing, first frame and one-level driving gear fixed connection.

Furthermore, the second planet row comprises a second sun gear, a second planet wheel set, a second frame and a second gear ring, an output shaft of the second driving motor is fixedly connected with the second sun gear, the second sun gear is meshed with the second planet wheel set, the second frame is used for fixing the second planet wheel set, the second frame is rotatably connected with each planet wheel in the second planet wheel set, the second planet wheel set is meshed with the second gear ring, the second gear ring is fixedly connected with the box body, and the second frame is fixedly connected with the first sun gear.

Further, differential mechanism includes differential mechanism casing, cross bevel gear and differential lock, and cross bevel gear and differential lock set up in the casing, differential mechanism is provided with two outputs, and two output fixed connection are in the both sides of cross bevel gear, and two outputs respectively with the left output semi-axis of vehicle, right output semi-axis fixed connection, differential mechanism casing and two driven gear fixed connection.

Furthermore, the right output half shaft and the left output half shaft are arranged in a reverse direction, and the axes of the right output half shaft and the left output half shaft are located on the same straight line.

Further, the differential lock is a wet clutch differential lock.

The invention has the beneficial effects that: the invention has simple structure, gets rid of the structural limitation of a bevel gear main reducer, has compact built-in structure, can use a planetary row to converge the input power of two driving motors, realizes the stepless speed regulation of the output rotating speed by coupling the rotating speeds of the two driving motors through the planetary row, can select a mode of independent control of double-motor torque during control, realizes the controllable requirement of the output torque of a vehicle, realizes the power convergence of an electric drive bridge through the two motors and the two planetary rows, further cooperates with the output rotating speed range of the driving motors to realize the stepless speed change, simultaneously uses the driving motors on two sides of a shaft to reduce the axial space of the electric drive bridge on two shafts, saves the integral axial arrangement space of the electric drive bridge, and leads the independent suspension of the electric drive bridge and the overall arrangement of the vehicle to be more convenient.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Wherein: 701-first driving motor, 702-second driving motor, 703-first planetary row, 704-second planetary row, 705-box, 706-first sun gear, 707-first planetary gear set, 708-first frame, 709-first ring gear, 710-second sun gear, 711-second planetary gear set, 712-second frame, 713-second ring gear, 714-one shaft driving gear, 715-two shaft driven gear, 716-differential, 717-left output half shaft, 718-right output half shaft and 719-differential lock.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, the invention discloses a double-motor stepless speed regulation electric drive axle, which comprises a first drive motor 701, a second drive motor 702, a first planet row 703, a second planet row 704, a primary reduction gear, a box body and a differential 716, wherein the first planet row 703 comprises a first sun gear 706, a first planet gear set 707, a first frame 708 and a first ring gear 709, the second planet row 704 comprises a second sun gear 710, a second planet gear set 711, a second frame 712 and a second ring gear 713, the primary reduction gear comprises a primary driving gear 714 and a secondary driven gear 715, and the differential 716 comprises a differential housing, a cross-shaped bevel gear and a differential lock 719.

The first driving motor 701 and the second driving motor 702 are arranged at two sides of the box body, in order to save the axial arrangement space of the driving axle, the output shafts of the first driving motor 701 and the second driving motor 702 are on the same axis, the axial space of two ends of the two shafts of the electric driving axle is reduced by using the coaxial arrangement mode, the distance between the left output half shaft 717 and the right output half shaft 718 is shortened, the arrangement of the electric driving axle on the vehicle with independent suspension is facilitated, the first planet row 703, the second planet row 704 and the first-stage reduction gear are arranged in the box body, the two planet rows can receive the input power of the input shaft of the first driving motor 701 and the input power of the input shaft of the second driving motor 702, the output shaft of the first driving motor 701 is fixedly connected with the gear ring 709 of the first planet row 703, the gear ring 709 is connected with the first planet gear group 707 in a meshing way, the first planet group 707 is connected with the first sun gear 706, the planet gears in the first planet gear set 707 are connected through a first frame 708, the first frame 708 is rotatably connected with the planet gears of the first planet gear set 707, the first frame 708 is fixedly connected with the center of a first shaft driving gear 714, the first shaft driving gear 714 is meshed with a second shaft driven gear 715, and the second shaft driven gear 715 is fixedly connected with a differential 716; the output end of the second driving motor 702 is fixedly connected with the center of a second sun gear 710, the second sun gear 710 is meshed with a second planetary gear set 711, each planetary gear in the second planetary gear set 711 is connected through a second frame 712, the second frame 712 is rotatably connected with each planetary gear of the second planetary gear set 711, the second frame 712 is fixedly connected with a first sun gear 706, the second planetary gear set 711 is meshed with a second ring 713, the second ring 713 is fixedly connected with a box body 705, the main functions of the two planetary rows are matching of the rotating speed of the driving motor and the range of the rotating speed of the output, the first planetary row 703 outputs power to a first-stage reduction gear through the first frame 708 to further reduce the rotating speed of the output and improve the output torque to meet the power requirement of the whole vehicle, and stepless regulation of the output rotating speed of the electric drive bridge is realized by stepless speed regulation of the two motors.

The type of the differential may be selected according to the requirement of a user, in this embodiment, the differential 716 is provided with two output ends, the two output ends are respectively and fixedly connected with a left output half shaft 717 and a right output half shaft 718 of the vehicle, the right output half shaft 718 and the left output half shaft 717 are oppositely arranged, and the axle center is located on the same straight line, a cross-shaped bevel gear is arranged between the two output ends, the two output ends are fixedly arranged on gears at both sides of the cross-shaped bevel gear and are installed in a differential housing, a differential lock 719 is further provided in the differential housing, the type of the differential lock may be selected according to the requirement of the user, for example, a face tooth differential lock or a wet clutch differential lock, the differential lock 719 in this embodiment is a wet clutch differential lock, in other embodiments, a common face tooth differential lock may also be used, and the differential 716 may implement 1: 1 torque output, satisfy the vehicle through the unanimous demand of two wheel torque output about the different road surfaces, the setting of two output ends of differential mechanism 716, can realize the torque distribution of the left and right sides wheel of vehicle when different road surfaces are gone, satisfy the vehicle demand of traveling on the complicated road surface of difficulty, differential mechanism 716 installs differential lock 719, can block differential mechanism 716 through differential lock 719, satisfy the stranded demand of vehicle on the difficult road surface of getting rid of.

The power transmission mode through the first driving motor in the invention is as follows: the power is transmitted to a first gear ring from an output shaft of a first driving motor and then transmitted to a first planetary gear set meshed with the first gear ring from the first gear ring, the rotation of the first planetary gear set transmits the power to a first frame, the first frame is fixedly connected with a first shaft driving gear, so the power is transmitted to a first shaft driving gear and then transmitted to a differential mechanism from the first shaft driving gear to a second shaft driven gear meshed with the first shaft driving gear, the differential mechanism is connected with a left output half shaft and a right output half shaft, the other end of the right output half shaft is connected with a differential mechanism shell through a differential lock, the left output half shaft and the right output half shaft are locked at the same rotating speed after the differential lock is combined, the stepless speed regulation of the first driving motor is utilized to realize the stepless regulation of the output rotating speed of an electric drive axle, and the power transmission mode of a second driving motor is similar.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims

1. A double-motor stepless speed regulation electric drive axle is characterized in that: including first driving motor, second driving motor, reduction gears and differential mechanism, first driving motor and second driving motor's output shaft is on same axis, reduction gears includes box, first planet row, second planet row and one-level reduction gear, and first planet row, second planet row and one-level reduction gear set up in the box, first driving motor is arranged the drive with first planet and is connected, second driving motor is arranged the drive with second planet and is connected, first planet row is arranged the meshing with the second planet row and is connected, first planet row is arranged the drive with one-level reduction gear and is connected, one-level reduction gear is connected with differential mechanism drive.

2. The electric drive axle for stepless speed regulation of double motors as claimed in claim 1, wherein the primary reduction gear comprises a primary driving gear and a secondary driven gear, the output end of the first planetary row is fixedly connected with the primary driving gear, and the primary driving gear is meshed with the secondary driven gear.

3. The double-motor stepless speed regulation electric drive axle according to claim 2, wherein the first planetary row comprises a first sun gear, a first planetary gear set, a first frame and a first gear ring, an output shaft of the first drive motor is fixedly connected with the first gear ring, the first gear ring is meshed with the first planetary gear set, the first frame is used for fixing the first planetary gear set, the first frame is rotationally connected with each planetary gear in the first planetary gear set, the first planetary gear set is further meshed with the first sun gear, and the first frame is fixedly connected with the primary driving gear.

4. The double-motor stepless speed regulation electric drive axle as claimed in claim 3, wherein the second planetary row comprises a second sun gear, a second planetary gear set, a second frame and a second gear ring, an output shaft of the second drive motor is fixedly connected with the second sun gear, the second sun gear is meshed with the second planetary gear set, the second frame is used for fixing the second planetary gear set, the second frame is rotatably connected with each star gear in the second planetary gear set, the second planetary gear set is meshed with the second gear ring, the second gear ring is fixedly connected with the box body, and the second frame is further fixedly connected with the first sun gear.

5. The double-motor stepless speed regulation electric drive axle as claimed in claim 2, wherein the differential mechanism comprises a differential mechanism shell, a cross bevel gear and a differential lock, the cross bevel gear and the differential lock are arranged in the shell, the differential mechanism is provided with two output ends, the two output ends are fixedly connected to two sides of the cross bevel gear, the two output ends are respectively and fixedly connected with a left output half shaft and a right output half shaft of the vehicle, and the differential mechanism shell is fixedly connected with the two-shaft driven gear.

6. The electric drive axle with double motors and stepless speed regulation as claimed in claim 5, wherein the right output half shaft and the left output half shaft are arranged oppositely and the axes are located on the same straight line.

7. The electric drive axle with double motor and stepless speed regulation as claimed in claim 5, wherein the differential lock is a wet clutch differential lock.