CN117021921A

CN117021921A - Dual-motor electric drive axle assembly and vehicle thereof

Info

Publication number: CN117021921A
Application number: CN202311052474.6A
Authority: CN
Inventors: 沈彭; 李继成; 李巍; 龚丽萍; 杨玉龙; 任广福; 付龙; 袁浩然
Original assignee: Zhejiang Xuanfu Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Current assignee: Zhejiang Xuanfu Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Priority date: 2023-08-21
Filing date: 2023-08-21
Publication date: 2023-11-10

Abstract

The invention provides a double-motor electric drive axle assembly, which comprises a first motor, a second motor, a speed changer, a planetary row and a differential mechanism, wherein the first motor is connected with the second motor; the two speed variators are respectively and correspondingly arranged at one side of the first motor and one side of the second motor, and input shafts of the two speed variators are respectively connected with the main shafts of the first motor and the second motor; the sun gear of the planet row is in transmission connection with the output shafts of the two speed variators; the differential mechanism is respectively connected with the planet carrier of the planet row and the half shafts at the two ends of the axle. According to the invention, two motors and two second-gear speed changers are adopted, so that the two motors are coupled and output to the main reduction gear in the axle through the two speed changers with different speed ratios, the main reduction gear is connected with the sun gear of the planetary row, the planetary carrier is connected with the differential mechanism shell, and finally power is output through the planetary reduction mechanism by the planetary carrier (differential mechanism), thereby solving the problems that the high-efficiency area of the motors is fully utilized by the whole vehicle power system, the energy consumption of the whole vehicle is reduced, the cost is reduced, and the power performance and the economy of the system are optimized.

Description

Dual-motor electric drive axle assembly and vehicle thereof

Technical Field

The invention relates to the technical field of automobile transmissions, in particular to a double-motor electric drive axle assembly and a vehicle with the same.

Background

Along with the requirements of energy conservation and emission reduction and the rising of fuel price, all large host factories currently focus on the placement of the pure electric vehicles. The electric drive assembly is used as a core component of the pure electric vehicle, and is developed towards integration, light weight, high power density and large torque ratio, and besides passenger vehicles, the commercial vehicle electric drive axle technology is also rapidly developed. At present, the commercial vehicle heavy truck electric drive assembly mainly adopts a single motor to match with four-gear or six-gear AMT (Automated Mechanical Transmission electric control mechanical automatic transmission) products, and has low system integration level, large volume and large weight. Meanwhile, the AMT has the disadvantages of power interruption during gear shifting, poor driving experience, insufficient safety and the like when being applied to certain special vehicles (such as mine cards). Because the actual use condition of the whole vehicle is complex, the single motor can work in an inefficient area for a long time, and the energy consumption of the whole vehicle is high. In addition, at present, manufacturers are exploring a double-motor integrated electric drive axle, but the speed reduction is smaller or a planetary reduction mechanism is added at the wheel side, and the structure has poor heat dissipation, and particularly the wheel side planetary mechanism is easy to damage under the working condition of escaping.

The heavy truck electric drive axle in the market at present mainly uses a single motor to match with an AMT, and the power configuration mainly has the following defects:

1. the combination of the single motor and the AMT has low integration level, and large volume and weight, so that the appearance size of the electric drive axle is large, the whole vehicle arrangement is limited, and great difficulty is caused to the generalization and the planarization of the electric drive axle; the weight is large, the power consumption of the whole vehicle is increased to a certain extent, and meanwhile, the cost is increased;

2. because of the speed ratio limitation of AMT, in order to meet the requirement of complex working conditions, the power and torque of the selected motor are large, and a large motor has to be selected, so that the volume and weight of the motor are large, and the cost is increased;

3. the combination of a single motor and an AMT is difficult to balance the power performance economical demand, and most of actual working conditions of the whole vehicle are smaller in power demand, so that the driving motor runs in a low-efficiency area, and the energy consumption of the whole vehicle is higher.

The following disadvantages also exist for an electric drive axle of a double motor and wheel planetary reduction mechanism:

1. the planetary reduction mechanism is arranged at the wheel end, has small space and no forced lubrication, and has poor heat dissipation performance and higher failure rate under low-speed high-power working conditions such as escaping;

2. the planetary reduction mechanism is arranged on both driving wheels, so that the cost is increased.

In order to overcome the defects of the technology, the invention provides the double-motor electric drive axle which has high integration level, so that the whole structure and the volume of the electric drive axle assembly are more compact, the cost is better, the high-efficiency area of the motor is more fully utilized by a whole vehicle power system according to the actual working condition of the whole vehicle, the energy consumption of the whole vehicle is further reduced, the cost is reduced, and the dynamic property and the economical efficiency of the system are optimized.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a dual-motor electric drive axle assembly and a vehicle thereof, wherein two motors and two speed variators are adopted, so that the two motors are coupled and output to a main reduction gear in an axle through the two speed variators, the main reduction gear and a sun gear of a planetary gear are integrally designed, a planetary carrier and a differential housing are integrally designed, and final power is output by the planetary carrier (differential) after passing through the planetary reduction mechanism, thereby solving the problems that the power system of the whole vehicle makes full use of the high-efficiency area of the motors, further reduces the energy consumption of the whole vehicle, reduces the cost, and optimizes the power performance and economy of the system.

The invention provides a double-motor electric drive axle assembly, which comprises a first motor, a second motor, a speed changer, a planetary row and a differential mechanism, wherein the first motor is connected with the second motor; the second motor and the first motor are arranged on the same side or different sides of the axle of the electric drive axle; the two speed variators are respectively and correspondingly arranged at one side of the first motor and one side of the second motor, and input shafts of the two speed variators are respectively connected with the main shafts of the first motor and the second motor; the planetary arrangement is arranged in the axle, and the sun gear of the planetary arrangement is in transmission connection with the output shafts of the two speed variators; the differential mechanism is respectively connected with the planet carrier of the planet row and the half shafts at the two ends of the axle.

In an embodiment of the present invention, the planetary gear set further includes a main reduction gear, wherein the main reduction gear is fixedly arranged on a shaft body of a sun gear of the planetary gear set and is meshed with gears on output shafts of the two transmissions respectively.

In an embodiment of the present invention, the first motor and the second motor and the two transmissions thereof are respectively connected in a driving manner, and are symmetrically disposed at two sides of the axle.

In one embodiment of the invention, the transmission is configured as a two-speed transmission, and the speed ratios of both transmissions are different.

In one embodiment of the invention, the transmission comprises a first gear, a second gear and a gear shifting sliding sleeve, wherein the first gear is sleeved on the output shaft and meshed with the gear on the input shaft; the second gear is sleeved on the output shaft and meshed with the gear on the input shaft; the gear shifting sliding sleeve is arranged on the spline of the output shaft in a sliding sleeve manner and is positioned between the first gear and the second gear, and the internal spline of the gear shifting sliding sleeve is respectively meshed with the external spline of the first gear and the external spline of the second gear.

In one embodiment of the present invention, the transmission further comprises an intermediate shaft, and the intermediate shaft is meshed with the gear on the input shaft, the first gear and the second gear through gears fixedly connected to the intermediate shaft.

In an embodiment of the present invention, the shift sliding sleeve is selectively disposed on the output shaft, the input shaft or the intermediate shaft, and the first gear and the second gear are respectively disposed on the output shaft, the input shaft or the intermediate shaft at two ends of the shift sliding sleeve.

In an embodiment of the present invention, the gear fixedly connected to the intermediate shaft includes a first gear, a second gear and a third gear, and the first gear is meshed with the gear on the input shaft; the second gear is meshed with the first gear; the third gear is meshed with the second gear; the first gear is different from the gear on the input shaft, the second gear is different from the first gear, and the third gear is different from the second gear.

In one embodiment of the invention, the planetary gear comprises a sun gear, a planet carrier, a gear ring and a planet gear, wherein the sun gear is respectively meshed with gears on output shafts of two speed variators through a main reduction gear fixedly connected on a shaft body of the sun gear; the planet carrier is fixedly connected with a shell of the differential mechanism; the gear ring is fixedly connected with the shell of the axle; the planet wheel is arranged on the planet carrier and meshed with the gear ring and the sun gear.

In one embodiment of the present invention, the planetary gear row includes a sun gear, a planet carrier, a gear ring, a first planetary gear and a second planetary gear, wherein the sun gear is respectively meshed with gears on output shafts of two transmissions through a main reduction gear fixedly connected to a shaft body of the sun gear; the planet carrier is fixedly connected with a shell of the differential mechanism; the gear ring is fixedly connected with the shell of the axle; the first planet wheel is arranged on the planet carrier and meshed with the sun wheel; the second planet wheel is arranged on the planet carrier, meshed with the gear ring and connected with the first planet wheel through the planet carrier; wherein the speed ratio between the first planet and the second planet is different.

In an embodiment of the present invention, the first motor and the second motor are set to be of the same type or different types, and the first motor and/or the second motor are coupled to form a plurality of power output working modes by matching with a transmission.

The invention also provides a vehicle which comprises the double-motor electric drive axle assembly.

The beneficial effects of the invention are as follows:

1. the invention adopts the integrated design of the two motors, the two speed variators and the parallel shaft, so that the structure of the electric drive axle assembly is simple, the speed variators with mature technology are adopted, the reliability is high, and various output modes are formed by coupling the two motors and the two speed variators, and the electric drive axle assembly is flexible and adjustable.

2. The invention adopts two motors to carry out coupling output to the main reduction gear in the axle through two speed variators with different speed ratios, the main reduction gear is designed integrally with the sun gear of the planetary row, the planetary frame is designed integrally with the differential mechanism shell, and finally, the power is output by the planetary frame (differential mechanism) after passing through the planetary reduction mechanism.

3. The invention has high integration level, so that the whole structure and the volume of the electric drive bridge assembly are more compact, and the cost is more excellent; meanwhile, the two motors can select the same power, and can also select motors with different powers, the gear speed ratios of the two speed variators are different, and the two speed variators can be coupled into seven power output modes with four groups of speed ratios, so that the system can more fully utilize the high-efficiency area of the motors according to the actual working condition of the whole vehicle, further reduce the energy consumption of the whole vehicle, reduce the cost and optimize the dynamic property and the economical efficiency of the system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic diagram of a dual electromechanical drive axle assembly of the present invention;

FIG. 2 is a schematic diagram of a dual electro-mechanical drive axle assembly of the present invention employing a duplex planetary configuration;

fig. 3 is a schematic diagram of the present invention double electro-mechanical drive axle assembly with no intermediate shaft drive structure.

In the figure: 100. an axle; 1. a first motor; 11. a second motor; 20. a transmission; 2/12, input shaft; 3/13, intermediate shaft; 31. a first gear; 32. a second gear; 33. a third gear; 4/14, output shaft; 5/15, first gear; 6/16, 7/17 of a gear shifting sliding sleeve and a second gear; 8. a main reduction gear; 9. a planet row; 91. a sun gear; 92. a planet carrier; 93. a gear ring; 94. a planet wheel; 940. a first planet; 941. a second planet wheel; 10. a differential.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1 to 3. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

Referring to fig. 1 to 3, the present invention provides a dual-motor electric drive axle assembly, which includes a first motor 1, a second motor 11, a transmission 20, a planetary gear set 9 and a differential 10; the second motor 11 and the first motor 1 are arranged on the same side or different sides of the axle 100 of the electric drive axle; the two speed changers 20 are respectively and correspondingly arranged on one side of the first motor 1 and one side of the second motor 11, and the input shafts 2/12 of the two speed changers 20 are respectively connected with the main shafts of the first motor 1 and the second motor 11; the planet row 9 is arranged in the axle 100, and the sun gear 91 of the planet row 9 is in driving connection with the output shafts 4/14 of the two transmissions 20; differential 10 is connected to the planet carrier 92 of row 9 and to the axle shafts on either side of axle 100.

Further, the planetary gear train further comprises a main reduction gear 8, wherein the main reduction gear 8 is fixedly arranged on the shaft body of the sun gear 91 of the planetary gear train 9 and is respectively meshed with gears on the output shafts 4/14 of the two speed variators 20.

In this embodiment, the reduction structure of the planet row 9 is added in the electric drive axle, which is a group of transmission ratios more than the structure of the conventional AMT transmission 20 plus axle 100, and the range of speed ratio adjustment can be larger, so that the power and torque requirements for the motors (i.e. the first motor 1 and the second motor 11, which are the same below) can be reduced, so that the motors become smaller, and even the passenger car motors can be used. The whole vehicle controls the working quantity of the motors and the gear of the transmission 20 according to the actual power demand, so that the motors always work in a high-efficiency area. The motor power is finally input through the sun gear 91 and output through the planet carrier 92 (differential 10) by the planet row 9 arranged in the axle 100; and is connected with the planet carrier 92 through the differential mechanism 10, so as to realize the differential function of the left and right wheels. The power of the double motors is coupled into the planetary gear set 9 speed reducing mechanism through the speed changer 20, and the speed ratio adjusting range is wide; and the planetary gear number of the planetary gear row 9 speed reducing mechanism can be adjusted according to the bearing requirement, and the bearing capacity is better than that of a parallel shaft structure.

It should be noted that, since the electric drive axle adopts two motors and is separately matched with the transmission 20, when a single motor operates, the other motor can shift gears according to the need, and at the moment, the other motor works, so that no power is interrupted, and the shift process is not perceived subjectively; the powerless interrupt gear shifting can be realized, the driving experience is improved, and the application scene of the whole vehicle is further expanded. And the planet row 9 is arranged in the axle 100, so that lubrication is more sufficient than that of the planet row arranged at the wheel end, the reliability of products is improved, and the application scene is expanded.

Referring to fig. 1 to 3, in an embodiment, a first motor 1 and a second motor 11 and two transmissions 20 respectively connected in a driving manner are symmetrically disposed at two sides of an axle 100. The transmission 20 is provided as a two-speed transmission 20, and the speed ratios of both transmissions 20 are different.

In this embodiment, the overall structure of the electric drive axle adopts a double motor (the double motor is the first motor 1 and the second motor 11, which are the same as the following) and the two-gear transmission 20 which are symmetrically arranged and are separately arranged at two sides of the axle 100, so that the electric drive axle has a compact structure, and is more suitable for the generalization and the platform of the whole vehicle product. For example, according to actual needs, the dual-motor electric drive bridge with the same structure can be arranged on the single-motor bridge 100 and the dual-motor electric drive bridge 100. Likewise, the arrangement positions of the dual motors may be opposite or other arrangement modes capable of realizing transmission, and the function implementation of the embodiment is not affected.

It should be noted that, in this embodiment, the dual motors are respectively matched with the two-gear transmission 20, and are symmetrically arranged on the axle 100, so that the structure is compact, and the dual-motor transmission is more suitable for product generalization and platform; and the range of the multi-gear speed ratio of the double-motor matched transmission 20 is wide, the performance requirement of the electric drive bridge on the motor is reduced, a mature passenger car motor can be selected, and the embodiment risk, weight and cost of the product are reduced.

The double motors are respectively matched with the two-gear transmission 20, different gears are selected according to the working condition requirement of the whole vehicle, a single motor or double motors are selected to work, seven or even more working modes are formed through coupling, so that the double motors can work in a motor efficient area, the dynamic property and economical efficiency of the whole vehicle are improved, and meanwhile, the use cost of the whole vehicle is reduced.

Each motor in the electric drive axle is matched with one two-gear speed changer 20, the speed ratios of the two-gear speed changers 20 are different, four gears can be formed through coupling, then different gears are selected according to the working condition requirement of the whole automobile, a single motor or double motors are selected to work, seven or even more working modes are formed through coupling, and therefore the electric drive axle can work in a motor efficient area, and the power performance and the economical efficiency of the whole automobile are improved.

Referring to fig. 1 to 3, in an embodiment, the transmission 20 includes a first gear 5/15, a second gear 7/17, and a shift sleeve 6/16, wherein the first gear 5/15 is sleeved on the output shaft 4/14 and meshed with the second gear on the input shaft 2/12; the second gear 7/17 is sleeved on the output shaft 4/14 and meshed with a gear on the input shaft 2/12; the gear shifting sliding sleeve 6/16 is sleeved on the spline of the output shaft 4/14 in a sliding way and is positioned between the first gear 5/15 and the second gear 7/17, and the internal spline of the gear shifting sliding sleeve 6/16 is meshed with the external spline of the first gear 5/15 and the external spline of the second gear 7/17 respectively.

The gear shifting sliding sleeve 6/16 can slide left and right by the electric gear shifting actuating mechanism to realize gear shifting. When the gear shifting sliding sleeve 6/16 slides rightwards, the internal spline on the gear shifting sliding sleeve 6/16 is meshed with the external spline of the first gear 5/15, and is at a first gear position at the moment; when the shift sliding sleeve 6/16 slides leftwards, the internal spline on the shift sliding sleeve 6/16 is meshed with the external spline of the second gear 7/17, and is at the second gear position.

Further, a gear shifting sliding sleeve 6/16 is alternatively arranged on the output shaft 4/14, the input shaft 2/12 or the intermediate shaft 3/13, and a first gear 5/15 and a second gear 7/17 are respectively arranged on the output shaft 4/14, the input shaft 2/12 or the intermediate shaft 3/13 at two ends of the gear shifting sliding sleeve 6/16

The double motors are symmetrically arranged and are respectively matched with a two-gear transmission 20, the transmission 20 adopts a sliding sleeve structure, and the shifting sliding sleeve 6/16 on the output shaft 4/14 can be moved by electric control, pneumatic control or hydraulic control; likewise, the shift sliding sleeve 6/16 can be arranged on the input shaft 2/12 and the intermediate shaft 3/13, so that the structural design requirement of the transmission 20 is met, and the functional implementation of the embodiment is not affected.

Referring to fig. 1 and 2, in one embodiment, the transmission 20 further includes an intermediate shaft 3/13, and the intermediate shaft 3/13 is meshed with gears on the input shaft 2/12 and the first gear 5/15 and the second gear 7/17 through gears fixedly connected thereto, respectively.

Further, the gears fixedly connected to the intermediate shaft 3/13 comprise a first gear 31, a second gear 32 and a third gear 33, and the first gear 31 is meshed with the gears on the input shaft 2/12; the second gear 32 is meshed with the first gear 5/15; the third gear 33 is meshed with the second gear 7/17; wherein the ratio between the first gear 31 and the gear on the input shaft 2/12, the second gear 32 and the first gear 5/15 and the third gear 33 and the second gear 7/17 are different.

By adding the intermediate shaft 3/13 in the transmission 20, the motor and the main reduction gear 8 are subjected to three-stage gear transmission, and the design of the intermediate shaft 3/13 can be omitted, so that the motor and the main reduction gear 8 are subjected to two-stage gear transmission, and the function implementation of the invention is not affected (refer to fig. 3).

Besides the second gear 32 and the third gear 33 which are respectively meshed with the first gear 5/15 and the second gear 7/17 are arranged on the intermediate shaft 3/13, a first gear 31 which is separately meshed with the gears on the input shaft 2/12 is further added, and further, the speed ratio adjusting range of the intermediate shaft 3/13 is further increased through the speed ratio control of the first gear 31 and the gears on the input shaft 2/12, so that the torque range of the output of the transmission 20 is improved.

Referring to fig. 1 and 3, in one embodiment, the planetary gear row 9 includes a sun gear 91, a planet carrier 92, a ring gear 93 and planet gears 94, wherein the sun gear 91 is meshed with gears on the output shafts 4/14 of the two transmissions 20 through a main reduction gear 8 fixedly connected to a shaft body thereof; the planet carrier 92 is fixedly connected with the housing of the differential 10; the gear ring 93 is fixedly connected with the shell of the axle 100; the planetary gears 94 are mounted on the carrier 92 and mesh with the ring gear 93 and the sun gear 91. The planetary structure has the advantages that the planetary wheels 94 are uniformly distributed around the central wheel to share the load, meanwhile, the characteristic of large internal engagement bearing capacity is fully utilized in the structure, and the integral bearing capacity of the electric drive bridge is increased in a limited space.

Referring to fig. 2, in one embodiment, the planetary gear row 9 includes a sun gear 91, a planet carrier 92, a gear ring 93, a first planetary gear 940 and a second planetary gear 941, where the sun gear 91 is meshed with gears on the output shafts 4/14 of the two transmissions 20 through a main reduction gear 8 fixedly connected to a shaft body thereof; the planet carrier 92 is fixedly connected with the housing of the differential 10; the gear ring 93 is fixedly connected with the shell of the axle 100; the first planet 940 is mounted on the carrier 92 and meshes with the sun gear 91; the second planetary gear 941 is mounted on the carrier 92, meshes with the ring gear 93, and is connected with the first planetary gear 940 through the carrier 92; wherein the speed ratio between the first planet 940 and the second planet 941 is different. The single planetary structure can be changed into the duplex planetary structure without affecting the function implementation of the present invention (refer to fig. 2).

It should be noted that, the transmission ratio of the duplex planetary structure is further improved by increasing the number of planetary gears 94, and the first planetary gear 940 and the second planetary gear 941 connected in series in the duplex planetary structure are supported by the planet carrier 92, so that the number of teeth of the two planetary gears 94 can be continuously increased to improve the torque density of the gears; and the meshing points among the planetary gears 94 are numerous and uniformly distributed, so that the torque transmission is stable, and the problems of tooth surface fatigue, noise and the like are not easy to occur. Meanwhile, the planet gears 94 and the sun gear 91 of the duplex planetary structure can be axially arranged on the gear ring 93, so that the structure is compact and is suitable for the size of an electric drive axle. The planet wheel 94 with the duplex planetary structure can rotate and revolve around the gear ring 93 to realize positive and negative conversion, and the planet wheel 94 and the sun wheel 91 with the duplex planetary structure can serve as a driving wheel and a driven wheel, so that the reversibility is good; therefore, the motor braking device is suitable for the working condition that the electric drive axle assembly brakes the whole vehicle by using the motor.

Referring to fig. 1 to 3, in an embodiment, the first motor 1 and the second motor 11 are configured with the same model or different models, and the first motor 1 and/or the second motor 11 are coupled to form multiple power output operation modes in cooperation with the transmission 20.

Further, the invention also provides a vehicle, which comprises the double-motor electric drive axle assembly.

The dual-motor electric drive axle (the part inside the dashed line frame in the drawing) provided in this embodiment is mainly composed of two first and second motors 1 and 11 and a two-speed transmission 20 symmetrically arranged on both sides of an axle 100. The transmission comprises a first motor 1, an input shaft 2 of a transmission 20, an intermediate shaft 3 of the transmission 20, an output shaft 4 of the transmission 20, a first gear 5, a gear shifting sliding sleeve 6, a second gear 7, a main reduction gear 8, a planetary row 9 and a differential 10; the second motor 11, the input shaft 12 of the transmission 20, the intermediate shaft 13 of the transmission 20, the output shaft 14 of the transmission 20, the first gear 15, the shift sleeve 16, the second gear 17.

The first motor 1 and the second motor 11 of the double-motor electric drive bridge can be the same, and motors with different powers can be selected according to the working condition demands of vehicle types, so that the speed ratio of the two-gear transmission 20 matched with the first motor 1 and the second motor 11 is generally different for expanding the working efficient area of the double-motor electric drive bridge and is divided into main drive and auxiliary drive. The first motor 1 and the second motor 11 are respectively connected with an input shaft 2/12 of the two-gear transmission 20, output to a main reduction gear 8 through an intermediate shaft 3/13 and an output shaft 4/14, the main reduction gear 8 is fixedly connected with a sun gear 91 of a planet row 9, a gear ring 93 is fixed, a planet carrier 92 is output, meanwhile, the planet carrier 92 is fixedly connected with a shell of the differential 10, power is finally transmitted to the differential 10, and finally, the power is transmitted to wheel output through half shafts at two ends of an axle 100. The two speed variators 20 are the same as the speed ratio between the output shaft 4/14 and the main reduction gear 8, so that the single main reduction gear 8 is meshed with the two speed variators 20 at the same time, the speed ratios between the other gears can be the same or different, and the gear position is determined by the position of the gear shift sleeve to be neutral or first or second.

According to the working condition of the whole vehicle, the double-motor electric drive bridge can realize the following power combination:

1. when the whole vehicle needs large torque output (such as starting or heavy load climbing), the gear shifting sliding sleeve 6 is combined with the first gear 5, the gear shifting sliding sleeve 16 is combined with the first gear 15, and the first gear speed ratio is large, so that the output wheel end torque is large, the first motor 1 and the second motor 2 work together, and the whole vehicle is driven together;

2. when the vehicle needs medium torque output or the vehicle speed reaches a gear shift point after starting, the gear shift sliding sleeve 6 is combined with the first gear 5, the gear shift sliding sleeve 16 is combined with the second gear 17, or the gear shift sliding sleeve 6 is combined with the second gear 7, the gear shift sliding sleeve 16 is combined with the first gear 15, and at the moment, the first motor 1 and the second motor 2 work together to drive the vehicle together;

3. as the vehicle speed rises, the gear shifting sliding sleeve 6 is combined with the second gear 7, the gear shifting sliding sleeve 16 is combined with the second gear 17, and at the moment, as the two speed variators 20 are both hung on the second gear, the speed ratio is reduced, the rotation speeds of the first motor 1 and the second motor 2 are reduced, and the first motor and the second motor work in a high-efficiency area;

4. when the whole vehicle cruises at a high speed, the required torque is not large, a calibration strategy can be set according to the vehicle speed, the first motor 1 or the second motor 2 is selected to work, the transmission 20 matched with the first motor 1 or the second motor 2 is engaged with a second gear, the first motor 1 or the second motor 2 works in a high-efficiency area, and the second motor 2 or the transmission 20 matched with the first motor 1 is engaged with a neutral gear;

5. when the whole vehicle is required to overtake at high-speed cruising, the first motor 1 and the second motor 2 work at the same time, and the transmission 20 is also in a second gear, so that the output torque is improved, and the acceleration power of the whole vehicle is improved;

assuming motor 1 as the primary drive and motor 2 as the secondary drive, the power combination can be expressed as follows:

in the table above: the speed changer I is a two-gear speed changer matched with the motor I; the transmission II is a two-gear transmission matched with the motor II; ● Indicating the motor to work; o indicates no operation; the vehicle speed and the operating mode are not limited to the above table.

When the two-motor electric drive axle is used for shifting gears of the speed changer 20, one speed changer 20 is in a gear position when the other speed changer 20 is in gear, and the corresponding motor keeps power output, so that no power interruption can be realized during gear shifting, and driving feeling is optimized.

Further, in the embodiment of the present invention, the specific process of gear shifting is as follows:

First gear power flow: the motor outputs power, the power is transmitted to the input shaft 2/12 of the transmission 20 through the rotor, the input shaft 2/12 is meshed with the intermediate shaft 3/13 gear normally, the power is transmitted to the intermediate shaft 3/13, the sliding sleeve is meshed with the first gear 5/15, the gear fixed on the intermediate shaft 3/13 transmits the power to the output shaft 4/14 through the first gear 5/15 pair, the output shaft 4/14 gear is meshed with the main reduction gear 8 normally, the sun gear 91 of the planet row 9 is fixedly connected with the main reduction gear 8, the power is transmitted to the sun gear 91 of the planet row 9, the power is output by the planet carrier 92 due to the fact that the gear ring 93 in the planet row 9 is fixedly connected to the axle housing, the planet carrier 92 is fixedly connected with the differential 10 shell, and finally the power of the motor is transmitted to the wheels through the differential 10 and the left half shaft and the right half shaft of the axle 100, and the power output of the first gear is completed.

Second gear power flow: the motor outputs power, the power is transmitted to the input shaft 2/12 through the rotor, the input shaft 2/12 is meshed with the intermediate shaft 3/13, the power is transmitted to the intermediate shaft 3/13, the sliding sleeve is meshed with the second gear 7/17, the gear fixed on the intermediate shaft 3/13 transmits the power to the output shaft 4/14 through the second gear 7/17 pair, the output shaft 4/14 gear is meshed with the main reduction gear 8, the sun gear 91 of the planet row 9 is fixedly connected with the main reduction gear 8, the power is transmitted to the sun gear 91 of the planet row 9, the power is output by the planet carrier 92 due to the fact that the inner gear ring 93 of the planet row 9 is fixedly connected to the axle housing, the planet carrier 92 is fixedly connected with the differential 10 shell, and finally the power of the motor is transmitted to the wheels through the differential 10 and the left half axle and the right half axle 100, so that the power output of the second gear is completed.

By utilizing the speed regulating function of the first motor 1 and the second motor 11, the first gear and the second gear of the first motor 1 can be respectively coupled with the first gear and the second gear of the second motor 11, and finally, the power is output to the wheels.

In summary, the present invention provides a dual motor electric drive axle assembly and a vehicle thereof. By adopting two motors and two speed variators 20, the two motors are coupled and output to a main reduction gear 8 in an axle 100 through the two speed variators 20, the main reduction gear 8 and a sun gear 91 of a planetary row 9 are integrally designed, a planet carrier 92 and a differential 10 shell are integrally designed, and finally power is output by the planet carrier 92 (differential 10) after passing through a planetary reduction mechanism.

The invention has high integration level, so that the whole structure and the volume of the electric drive bridge assembly are more compact, and the cost is more excellent; meanwhile, the two motors can be selected to have the same power, the motors with different powers can be selected, the gear speed ratios of the two speed changers 20 are different, the two speed changers can be coupled into four groups of speed ratios and seven power output modes, the system can more fully utilize the high-efficiency area of the motors according to the actual working condition of the whole vehicle, the energy consumption of the whole vehicle is further reduced, the cost is reduced, and the dynamic property and the economical efficiency of the system are optimized.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A dual motor electrically driven bridge assembly, comprising:

a first motor (1);

-a second electric motor (11), said second electric motor (11) and said first electric motor (1) being arranged on the same side or on different sides of an axle (100) of said electrically driven axle;

the speed changers (20) are respectively and correspondingly arranged on one side of the first motor (1) and one side of the second motor (11), and input shafts (2/12) of the two speed changers (20) are respectively connected with main shafts of the first motor (1) and the second motor (11);

-a planetary row (9), said planetary row (9) being arranged within said axle (100) and a sun gear (91) of said planetary row (9) being in driving connection with output shafts (4/14) of both said transmissions (20);

the differential mechanism (10), the differential mechanism (10) is respectively connected with the planet carrier (92) of the planet row (9) and the half shafts at two ends of the axle (100).

2. The dual motor electric drive axle assembly according to claim 1, further comprising a main reduction gear (8), said main reduction gear (8) being fixedly arranged on the shaft body of the sun gear (91) of the planetary row (9) and being respectively engaged with gears on the output shafts (4/14) of the two gearboxes (20).

3. The dual motor electric drive axle assembly according to claim 2, characterized in that the first motor (1) and the second motor (11) and their respective transmission connection of the two gearboxes (20) are symmetrically arranged on both sides of the axle (100).

4. A two-motor drive axle assembly according to claim 3, characterized in that the transmission (20) is arranged as a single, two or multiple speed transmission (20) and that the speed ratios of both transmissions (20) are different.

5. The dual motor electric drive axle assembly of claim 1, wherein the transmission (20) comprises:

a first gear (5/15), wherein the first gear (5/15) is sleeved on the output shaft (4/14) and meshed with a gear on the input shaft (2/12);

a second gear (7/17), wherein the second gear (7/17) is sleeved on the output shaft (4/14) and meshed with a gear on the input shaft (2/12);

the gear shifting sliding sleeve (6/16), the gear shifting sliding sleeve (6/16) is arranged on the spline of the output shaft (4/14) in a sliding sleeve mode, is positioned between the first gear (5/15) and the second gear (7/17), and the internal spline of the gear shifting sliding sleeve (6/16) is meshed with the external spline of the first gear (5/15) and the external spline of the second gear (7/17) respectively.

6. The two-motor electric drive axle assembly according to claim 5, characterized in that the transmission (20) further comprises an intermediate shaft (3/13), the intermediate shaft (3/13) being meshed with a gear on the input shaft (2/12) and with the first gear (5/15) and the second gear (7/17), respectively, by means of a gear thereon.

7. The dual-motor electric drive axle assembly according to claim 6, characterized in that the shift sliding sleeve (6/16) is alternatively arranged on the output shaft (4/14), the input shaft (2/12) or the intermediate shaft (3/13), and the first gear (5/15) and the second gear (7/17) are respectively arranged on the output shaft (4/14), the input shaft (2/12) or the intermediate shaft (3/13) at two ends of the shift sliding sleeve (6/16).

8. A dual motor electric drive axle assembly according to claim 6, characterized in that the intermediate shaft (3/13) comprises:

a first gear (31), the first gear (31) being in mesh with a gear on the input shaft (2/12);

a second gear (32), the second gear (32) being meshed with the first gear (5/15);

a third gear (33), the third gear (33) being meshed with the second gear (7/17); and

wherein the ratio between the first gear (31) and the gear on the input shaft (2/12), the second gear (32) and the first gear (5/15) and the third gear (33) and the second gear (7/17) are different.

9. A double motor electric drive axle assembly according to claim 1, characterized in that the planetary row (9) comprises:

the sun gear (91), the said sun gear (91) is meshed with the gear on the said output shaft (4/14) of two said speed change gear (20) separately through the main reduction gear (8) fixedly connected to its axle body;

a planet carrier (92), wherein the planet carrier (92) is fixedly connected with a shell of the differential mechanism (10);

a gear ring (93), wherein the gear ring (93) is fixedly connected with the housing of the axle (100);

-a planet wheel (94), said planet wheel (94) being mounted on said planet carrier (92) and being in mesh with said ring gear (93) and with said sun gear (91).

10. A double motor electric drive axle assembly according to claim 1, characterized in that the planetary row (9) comprises:

a first planetary gear (940), the first planetary gear (940) being mounted on the carrier (92) and being in mesh with the sun gear (91);

a second planetary gear (941), wherein the second planetary gear (941) is mounted on the carrier (92), meshes with the ring gear (93), and is connected with the first planetary gear (940) through the carrier (92);

wherein the speed ratio between the first planet (940) and the second planet (941) is different.

11. The dual motor electric drive axle assembly according to any one of claims 1-10, characterized in that the first motor (1) and the second motor (11) are provided in the same model or in different models, and that the first motor (1) and/or the second motor (11) are coupled to form a plurality of power output modes of operation in cooperation with the transmission (20).

12. A vehicle comprising a dual electromechanical drive axle assembly according to any one of claims 1-11.