CN111497596A

CN111497596A - Double-motor driving device of electric automobile

Info

Publication number: CN111497596A
Application number: CN202010290296.0A
Authority: CN
Inventors: 杜明乾
Original assignee: SHANDONG HONGTAI MACHINERY TECHNOLOGY CO LTD
Current assignee: SHANDONG HONGTAI MACHINERY TECHNOLOGY CO LTD
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-08-07

Abstract

The invention belongs to the technical field of electric automobiles, and particularly relates to a double-motor driving device of an electric automobile, which comprises a first planet reducing mechanism, a first inner rotor motor, a second planet reducing mechanism and a second inner rotor motor which are sequentially arranged, wherein a first rotor is fixed on a first sun gear shaft, a first planet wheel carrier or a first shell is fixedly connected with a first stator, a second shell is fixedly connected with the first stator, a second stator is fixedly connected with the second shell and the first stator, and the second rotor is fixed on a second sun gear shaft; the device also comprises a clutch mechanism arranged between the first sun wheel shaft and the second planet wheel carrier, a first detection feedback structure arranged corresponding to the first sun wheel shaft and a second detection feedback structure arranged corresponding to the second planet wheel carrier. The synchronous connection between the first planetary reduction mechanism and the second planetary reduction mechanism can be realized, the running is stable, the phenomenon of blocking can not occur, and the problems of insufficient power and large electric quantity consumption in high-speed running during starting and low-speed climbing are solved.

Description

Double-motor driving device of electric automobile

Technical Field

The invention belongs to the technical field of electric automobiles, and particularly relates to a double-motor driving device of an electric automobile.

Background

The wheel hub motor is also called wheel built-in motor, and is a technology for placing the motor for driving electric automobile in the wheel rim and outside the wheel hub, and its most important feature is that the power, transmission and brake devices are all integrated into the wheel hub, so that the mechanical part of the electric automobile is greatly simplified.

The in-wheel motor driving system is mainly divided into two structural types according to the rotor type of the motor, wherein one structural type is an inner rotor type, and the other structural type is an outer rotor type.

The outer rotor type adopts a low-speed outer rotor motor, the highest rotating speed of the motor is 1000-1500r/min, no speed reduction device is provided, the rotating speed of the wheel is the same as that of the motor, and because large torque is needed when the vehicle runs on a low-speed slope, the current needs to be increased, thus the defects of magnetic steel heating and motor damage are easily caused; the inner rotor type adopts a high-speed inner rotor motor, a speed reducer with a fixed transmission ratio is arranged, the rotating speed of the motor can reach 10000r/min, and higher power density can be obtained.

Based on the manufacturing difficulty of a speed reducer with thousands of fixed transmission ratios and the range of a high-efficiency power section of a permanent magnet motor, the perfect matching between high-speed running and low-speed running of an automobile is difficult to meet.

Therefore, for the electric automobile adopting the inner rotor type hub motor, the inner rotor type hub motor is often under the working condition of low rotating speed and large torque during the starting stage and the low-speed climbing stage, and the problem of insufficient power can occur; when the automobile runs at a high speed, the electric quantity consumption is high, the hub motor can generate a lot of heat, and the electric quantity is wasted.

Disclosure of Invention

The invention aims to provide a double-motor driving device of an electric automobile, and aims to solve the problems of insufficient power and large electric quantity consumption during high-speed running of the conventional electric automobile in a starting stage and a low-speed climbing stage. Can realize the synchronous joint between first planet reduction gears and the second planet reduction gears, it is steady to travel, can not appear the card pause phenomenon, can improve drive moment when two motors use simultaneously, can satisfy the motor and move between high-efficient interval section when the exclusive use, reduce power consumption, can avoid the motor to produce too much heat simultaneously and reduce the fault rate.

The invention discloses a double-motor driving device of an electric automobile, which comprises a first inner rotor motor, a first planet speed reducing mechanism arranged at one end of the first inner rotor motor, a second inner rotor motor arranged at the other end of the first inner rotor motor, and a second planet speed reducing mechanism arranged between the second inner rotor motor and the first inner rotor motor;

the first inner rotor motor comprises a first stator and a first rotor sleeved with the first stator;

the first planetary reduction mechanism comprises a first sun gear shaft, a first planetary gear carrier rotationally mounted on the first sun gear shaft, and a first shell rotationally mounted on the first planetary gear carrier, wherein the first rotor is fixedly mounted on the first sun gear shaft; the first planet carrier is fixedly connected with the first stator, the first shell is a power output part, or the first shell is fixedly connected with the first stator, and the first planet carrier is a power output part;

the second planetary reduction mechanism comprises a second sun gear shaft which is coaxial with the first sun gear shaft, a second planet gear carrier which is rotatably arranged on the second sun gear shaft, and a second shell which is rotatably arranged on the second planet gear carrier and is fixedly connected with the first stator;

the second inner rotor motor comprises a second stator fixedly connected with the second shell and the first stator and a second rotor sleeved with the second stator, and the second rotor is fixedly arranged on the second sun gear shaft;

the double-motor driving device of the electric automobile further comprises a clutch mechanism arranged between the first sun wheel shaft and the second planet wheel carrier, a first detection feedback structure arranged corresponding to the first sun wheel shaft, and a second detection feedback structure arranged corresponding to the second planet wheel carrier.

As an improvement, a sun wheel shaft transmission tooth part is arranged at the end part of the first sun wheel shaft, and a planet wheel carrier transmission tooth part is correspondingly arranged on the second planet wheel carrier; the clutch mechanism is a hydraulic clutch and comprises an inner gear sleeve used for connecting the sun gear shaft transmission tooth part and the planet gear carrier transmission tooth part, a connecting disc rotatably arranged on the outer peripheral side of the inner gear sleeve, and an oil cylinder fixedly connected with the connecting disc and used for driving the inner gear sleeve to move axially.

As an improvement, the clutch mechanism is an electromagnetic clutch, the electromagnetic clutch includes a clutch housing, a driven plate, and a driving plate, the driving plate is fixedly connected to the first sun gear shaft, the driven plate is fixedly connected to the second planet carrier, the driving plate and the driven plate are in torque-resistant connection capable of rotating relatively, and a slip ring for supplying power to a coil of the electromagnetic clutch is disposed on the second housing.

As an improvement, an internal brake mechanism is arranged between the second housing and the first sun gear shaft/between the first stator and the first rotor, and the internal brake mechanism is an electromagnetic brake or a hydraulic brake.

As an improvement, the second detection device is fixedly mounted on the rear cover, an axial through hole is formed in the second sun gear shaft, a connecting rod fixedly connected with the second planet carrier is inserted into the axial through hole, and the end part, far away from the second planet carrier, of the connecting rod is in transmission connection with the second detection feedback device; when the first planet carrier is fixedly connected with the first stator, the first detection feedback structure is arranged between the first planet carrier and the first rotor, and when the first shell is fixedly connected with the first stator, the first detection feedback structure is arranged between the first shell and the first rotor.

Due to the adoption of the technical scheme, the double-motor driving device of the electric automobile comprises a first inner rotor motor, a first planetary speed reducing mechanism arranged at one end of the first inner rotor motor, a second inner rotor motor arranged at the other end of the first inner rotor motor, and a second planetary speed reducing mechanism arranged between the second inner rotor motor and the first inner rotor motor; the first inner rotor motor comprises a first stator, a first rotor sleeved with the first stator and a first coil magnet winding arranged between the first stator and the first rotor; the first planetary reduction mechanism comprises a first sun gear shaft, a first planetary gear frame rotationally mounted on the first sun gear shaft, and a first shell rotationally mounted on the first planetary gear frame, wherein a first rotor is fixedly mounted on the first sun gear shaft, the first planetary gear frame or the first shell is fixedly connected with a first stator, the first shell is a power output part when the first planetary gear frame is fixedly mounted, and the first planetary gear frame is a power output part when the first shell is fixedly mounted; the second planetary reduction mechanism comprises a second sun gear shaft which is coaxial with the first sun gear shaft, a second planet gear carrier which is rotatably arranged on the second sun gear shaft, and a second shell which is rotatably arranged on the second planet gear carrier and is fixedly connected with the first stator; the second inner rotor motor comprises a second stator fixedly connected with the second shell and the first stator and a second rotor sleeved with the second stator, and the second rotor is fixedly arranged on a second sun gear shaft; the device further comprises a clutch mechanism arranged between the first sun wheel shaft and the second planet wheel carrier, a first detection feedback structure arranged corresponding to the first sun wheel shaft, and a second detection feedback structure arranged corresponding to the second planet wheel carrier.

When the electric automobile is in work, the first detection feedback structure detects the rotation parameter of the first sun wheel shaft and transmits a detection signal back to the drive control system of the electric automobile, the drive control system of the electric automobile starts the second inner rotor motor, the second detection feedback structure detects the rotation parameter of the second planet wheel carrier and transmits the detection signal back to the drive control system of the electric automobile, the drive control system of the electric automobile adjusts the rotation of the second inner rotor motor until the rotation parameter of the second planet wheel carrier is matched with the rotation parameter of the first sun wheel shaft, the drive control system of the electric automobile controls the action of the clutch mechanism to fixedly connect the first sun wheel shaft and the second planet wheel carrier of the first planet speed reducing mechanism together, the first planet speed reducing mechanism and the second planet speed reducing mechanism can be synchronously jointed to enable the gear shifting to be smoother, and the inner rotor is driven by the first motor, The second inner rotor motor drives the electric automobile together, so that the driving torque can be improved, and the electric automobile is suitable for situations needing large torque in a starting stage, a low-speed climbing stage and the like; when the electric automobile runs at a high speed, the drive control system of the electric automobile controls the action of the clutch mechanism to separate the first sun gear shaft from the second planet gear carrier, the first planet speed reducing mechanism and the second planet speed reducing mechanism can be separated, and power is provided only through the first inner rotor motor, so that the consumption of electric energy can be reduced, the generation of heat can be reduced, and the failure rate can be reduced. The double-motor driving device of the electric automobile solves the problems of insufficient power and large electric quantity consumption during high-speed running of the conventional electric automobile in a starting stage and a low-speed climbing stage, can realize synchronous connection between the first planetary speed reducing mechanism and the second planetary speed reducing mechanism, is stable in running, does not have a blocking phenomenon, can improve driving torque when two motors are used simultaneously, can meet the requirement that the motors run in a high-efficiency interval when being used independently, reduces power consumption, and can prevent the motors from generating excessive heat and reduce failure rate.

Drawings

Fig. 1 is a schematic cross-sectional structural view of a clutch mechanism of a dual-motor driving device of an electric vehicle according to a first embodiment of the present invention in an engaged state;

fig. 2 is a schematic cross-sectional structural view of the clutch mechanism of the dual-motor driving device of the electric vehicle according to the first embodiment of the invention in a disengaged state;

fig. 3 is a schematic view of an installation structure of a dual-motor driving device of an electric vehicle according to a first embodiment of the present invention;

fig. 4 is a schematic cross-sectional structural view of a dual motor driving apparatus of an electric vehicle according to a second embodiment of the present invention;

fig. 5 is a schematic cross-sectional structural view of a dual motor driving apparatus of an electric vehicle according to a third embodiment of the present invention;

FIG. 6 is a schematic view of an installation structure of a dual motor driving apparatus of an electric vehicle according to a third embodiment of the present invention;

fig. 7 is a schematic cross-sectional structural view of a dual motor driving apparatus of an electric vehicle according to a fourth embodiment of the present invention;

FIG. 8 is a schematic view of an installation structure of a dual-motor driving apparatus of an electric vehicle according to a fourth embodiment of the present invention;

fig. 9 is a schematic cross-sectional structural view of a dual motor driving apparatus of an electric vehicle according to a fifth embodiment of the present invention;

fig. 10 is a schematic view of an installation structure of a dual-motor driving device of an electric vehicle according to a fifth embodiment of the present invention;

fig. 11 is a schematic cross-sectional structural view of a dual motor driving apparatus of an electric vehicle according to a sixth embodiment of the present invention;

fig. 12 is a schematic view of an installation structure of a dual motor driving apparatus of an electric vehicle according to a seventh embodiment of the present invention;

10, a first inner rotor motor, 11, a first stator, 12, a first rotor, 13, a first coil magnet winding, 14, a cooling water channel, 20, a first planetary reduction mechanism, 21, a first housing, 22, a first gear ring, 23, a first sun gear shaft, 24, a first planet carrier, 25, a first planet wheel, 30, a second inner rotor motor, 31, a second stator, 32, a second rotor, 33, a second coil magnet winding, 34, a rear cover, 40, a second planetary reduction mechanism, 41, a second housing, 42, a second gear ring, 43, a second sun gear shaft, 44, a second planet carrier, 45, a second planet wheel, 46, 50a, a hydraulic clutch, 50b, a hydraulic clutch, 50c, a hydraulic clutch, 50d, a hydraulic clutch, 51, an inner gear sleeve, 52a, a connecting disc, 52b, a connecting disc, 521, an outer disc body, 522, The brake device comprises an inner disc body, 53, an oil cylinder, 54, a mounting seat, 55, a bolt, 56, a spring, 57, a baffle ring, 58a, a brake disc, 58b, a clamp, 581, meshing teeth, 59, a guide shaft, 60a, a first detection feedback structure, 60b, a second detection feedback structure, 61, a connecting rod, 62, a mounting end, 70a, an external brake mechanism, 70b, an internal brake mechanism, 70c, an internal brake mechanism, 80a, a hub, 80b, a hub, 80c, a hub, 80d, a hub, 90, an electric motor, 91, a clutch shell, 92, a driven plate, 93, a driving plate, 94, a slip ring, 100, a drive axle shell, 110, a differential mechanism, 120, an input shaft, 130 and an output shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 to 10 are schematic structural diagrams of an electric vehicle dual-motor driving device according to an embodiment of the present invention, where fig. 1 shows a schematic sectional structure of a clutch mechanism of the electric vehicle dual-motor driving device according to the first embodiment of the present invention in a coupled state, fig. 2 shows a schematic sectional structure of the clutch mechanism of the electric vehicle dual-motor driving device according to the first embodiment of the present invention in a decoupled state, fig. 3 shows a schematic mounting structure of the electric vehicle dual-motor driving device according to the first embodiment of the present invention, fig. 4 shows a schematic sectional structure of the electric vehicle dual-motor driving device according to the second embodiment of the present invention, fig. 5 shows a schematic sectional structure of the electric vehicle dual-motor driving device according to the third embodiment of the present invention, fig. 6 shows a schematic mounting structure of the electric vehicle dual-motor driving device according to the third embodiment of the present invention, fig. 7 is a schematic sectional structure view illustrating an electric vehicle dual-motor driving device according to a fourth embodiment of the present invention, fig. 8 is a schematic sectional structure view illustrating an electric vehicle dual-motor driving device according to the fourth embodiment of the present invention, fig. 9 is a schematic sectional structure view illustrating an electric vehicle dual-motor driving device according to a fifth embodiment of the present invention, fig. 10 is a schematic sectional structure view illustrating an electric vehicle dual-motor driving device according to the fifth embodiment of the present invention, fig. 11 is a schematic sectional structure view illustrating an electric vehicle dual-motor driving device according to a sixth embodiment of the present invention, and fig. 12 is a schematic sectional structure view illustrating an electric vehicle dual-motor driving device according to the fifth embodiment of the present invention. For the sake of convenience, only the parts relevant to the present invention are shown in the drawings.

First embodiment

As can be seen from fig. 1, 2 and 3, the two-motor drive device of the electric vehicle includes a first inner rotor motor 10, a first planetary reduction mechanism 20 disposed at one end of the first inner rotor motor 10, a second inner rotor motor 30 disposed at the other end of the first inner rotor motor 10, and a second planetary reduction mechanism 40 disposed between the second inner rotor motor 30 and the first inner rotor motor 10;

the first inner rotor motor 10 includes a first stator 11, a first rotor 12 fitted with the first stator 11, and a first coil magnet winding 13 disposed between the first stator 11 and the first rotor 12;

the first planetary reduction mechanism 20 comprises a first sun gear shaft 23, a first sun gear arranged on the first sun gear shaft 23, a first planetary gear carrier 24 rotationally mounted on the first sun gear shaft 23 and fixedly connected with the first stator 11, and a first shell 21 rotationally mounted on the first planetary gear carrier 24, wherein a first gear ring 22 coaxially arranged with the first sun gear shaft 23 is arranged on the first shell 21, a plurality of first planetary gears 25 are mounted on the first planetary gear carrier 24, two sides of each first planetary gear 25 are respectively meshed with the first gear ring 22 and the first sun gear, and the first rotor 12 is fixedly mounted on the first sun gear shaft 23; specifically, the first sun gear and the first sun gear shaft 23 may be an integral structure or a split structure;

the second planetary reduction mechanism 40 comprises a second sun gear shaft 43 coaxially arranged with the first sun gear shaft 23, a second sun gear arranged on the second sun gear shaft 43, a second planet carrier 44 rotatably arranged on the second sun gear shaft 43, a second outer shell 41 rotatably arranged with the second planet carrier 44 and fixedly connected with the first stator 11, a second gear ring 42 circumferentially arranged around the second planet carrier 44 is arranged on the second outer shell 41, a plurality of second planet wheels 45 are arranged on the second planet carrier 44, and two sides of the plurality of second planet wheels 45 are respectively meshed with the second gear ring 42 and the second sun gear; specifically, the second sun gear and the second sun gear shaft 43 may be an integral structure or a split structure;

the second inner rotor motor 30 includes a second stator 31 fixedly connected to the second housing 41 and the first stator 11, a second rotor 32 sleeved with the second stator 31, and a second coil magnet winding 33 disposed between the second rotor 32 and the second stator 31, the second rotor 32 is fixedly mounted on a second sun gear shaft 43;

the double-motor driving device of the electric automobile further comprises a clutch mechanism arranged between the first sun wheel shaft 23 and the second planet wheel carrier 44, a first detection feedback structure 60a arranged at the position corresponding to the first sun wheel shaft 23 and used for detecting the rotation parameters of the first sun wheel shaft, and a second detection feedback structure 60b arranged at the position corresponding to the second planet wheel carrier 44 and used for detecting the rotation parameters of the second sun wheel shaft.

When the electric vehicle is mounted, the first housing 21 is fixedly connected to the hub 80a, and the first housing 21 serves as a power output unit of the electric vehicle dual-motor drive device for driving the hub 80 a. When the electric automobile is in operation, the first detection feedback structure 60a detects the rotation parameter of the first sun gear shaft 23 and transmits the detection signal back to the drive control system of the electric automobile, the drive control system of the electric automobile starts the second inner rotor motor 30, the second detection feedback structure 60b detects the rotation parameter of the second planet carrier 44 and transmits the detection signal back to the drive control system of the electric automobile, the drive control system of the electric automobile adjusts the rotation of the second inner rotor motor 30 until the rotation parameters of the second planet carrier 44 and the first sun gear shaft 23 are matched, and then the drive control system of the electric automobile controls the action of the clutch mechanism to fixedly connect the first sun gear shaft 23 and the second planet carrier 44 of the first planetary reduction mechanism 20 together, so as to realize the synchronous joint between the first planetary reduction mechanism and the second planetary reduction mechanism and make the gear shift smoother, the first inner rotor motor 10 and the second inner rotor motor 30 are used for driving the electric automobile together, so that the driving torque can be improved, and the electric automobile is suitable for situations needing large torque in a starting stage, a low-speed climbing stage and the like; when the electric automobile runs at a high speed, the drive control system of the electric automobile controls the action of the clutch mechanism to separate the first sun gear shaft 23 from the second planet carrier 44, the first planet speed reducing mechanism and the second planet speed reducing mechanism can be separated, and power is provided only by the first inner rotor motor 10, so that the consumption of electric energy can be reduced, the generation of heat can be reduced, and the failure rate can be reduced. The double-motor driving device of the electric automobile solves the problems of insufficient power and large electric quantity consumption during high-speed running of the conventional electric automobile in a starting stage and a low-speed climbing stage, can improve driving torque when two motors are used simultaneously, runs stably without a pause phenomenon, meets the requirement that the motors run between high-efficiency interval sections when the two motors are used independently, can reduce power consumption, can fully utilize the advantage of high rotation speed of the motors, and can prevent the motors from generating excessive heat and reduce failure rate.

In the present embodiment, a sun gear shaft transmission tooth portion is provided on the end portion of the first sun gear shaft 23, and a carrier transmission tooth portion is correspondingly provided on the second carrier 44; the clutch mechanism is a hydraulic clutch 50a, and the hydraulic clutch 50a comprises an inner gear sleeve 51 for connecting the sun gear shaft transmission tooth part and the planet carrier transmission tooth part, a connecting disc 52a rotatably mounted on the outer peripheral side of the inner gear sleeve 51, and a driving mechanism fixedly connected with the connecting disc 52a and used for driving the inner gear sleeve 51 to move axially. Generally, the rotation parameters of the first sun gear shaft 23 are the rotation speed of the first sun gear shaft 23 and the phase of the driving teeth on the sun gear shaft driving teeth, and the rotation parameters of the second planet carrier 44 are the rotation speed of the second planet carrier 44 and the phase of the driving teeth on the planet carrier driving teeth, so that the first sun gear shaft 23 and the second planet carrier 44 are connected through the inner gear sleeve 51.

Generally, a first rotor mounting cavity is formed in the first rotor 12 on the side thereof adjacent to the second planetary reduction mechanism 40, the first sun gear shaft 23 extending into the first rotor mounting cavity, the first rotor 12 being rotatably mounted on the first sun gear shaft 23 by a first rotor mounting sleeve portion extending into the first rotor mounting cavity; the drive mechanism includes a mounting seat 54 rotatably mounted on the first rotor mounting sleeve portion, and a plurality of oil cylinders 53 disposed between the mounting seat 54 and the inner gear sleeve 51. In order to reduce the external size and facilitate installation, an annular side wall which is coaxially arranged with the second sun gear shaft 43 and is inserted into the first rotor installation cavity is arranged on one side of the second shell 41 close to the first rotor 12, the planet carrier transmission tooth part is arranged inside the annular side wall, the inner gear sleeve 51 is installed in a cavity part formed by the annular side wall and the first rotor installation cavity, and the installation seat 54 is fixedly connected with one end of the annular side wall close to the first rotor 12. Because the mounting base 54 is rotatably mounted on the first sun gear shaft 23 and the connecting disc 52a is rotatably mounted on the outer peripheral side of the inner gear sleeve 51, when the first sun gear shaft 23 and the inner gear sleeve 51 rotate, the mounting base 54 and the connecting disc 52a cannot rotate along with each other, and the oil cylinder 53 is connected between the mounting base 54 and the connecting disc 52a, the oil cylinder 53 cannot be influenced by the rotation of the first sun gear shaft 23 and the inner gear sleeve 51, and an oil path is convenient to set; the inner gear sleeve 51 is driven to move axially through the action of the oil cylinder 53, so that the inner gear sleeve 51 is meshed with the sun gear shaft transmission tooth part and the planet carrier transmission tooth part respectively, the first sun gear shaft 23 and the second planet carrier 44 are fixedly connected together, and the first inner rotor motor 10 and the second inner rotor motor 30 provide power together; the reverse action of the oil cylinder 53 drives the inner gear sleeve 51 to move axially, so that the inner gear sleeve 51 is separated from the sun gear shaft transmission tooth part or the planet carrier transmission tooth part, the first sun gear shaft 23 is not connected with the second planet carrier 44, and the first inner rotor motor 10 provides power.

In order to facilitate the inner gear sleeve 51 to be rapidly separated from the sun gear shaft transmission gear part or the planet carrier transmission gear part, an elastic reset mechanism is further arranged between the first rotor mounting sleeve part and the inner gear sleeve 51, the elastic reset mechanism comprises at least two bolts 55 arranged at intervals along the circumferential direction of the first sun gear shaft 23, a spring 56 is arranged corresponding to each bolt 55, a stepped hole is respectively arranged on the inner gear sleeve 51 corresponding to each bolt 55, the small-diameter end of the stepped hole is arranged close to the first rotor mounting sleeve part, the large-diameter end of the stepped hole is arranged far away from the first rotor mounting sleeve part, the bolt 55 penetrates through the stepped hole and then is fixedly connected with the first rotor mounting sleeve part, the head part of the bolt 55 is arranged in the large-diameter end of the stepped hole, and the spring 56 is arranged in the large-diameter end of the stepped hole and is sleeved on the bolt 55.

Specifically, the connecting disc 52a is a split structure, and includes an inner disc body 522 arranged close to the inner gear sleeve 51 and an outer disc body 521 arranged far away from the inner gear sleeve 51, a mounting ring groove is formed between the intersection of the inner disc body 522 and the outer disc body 521, a fastening member is arranged between the inner disc body 522 and the outer disc body 521, generally, the fastening member is a bolt, specifically, the connecting disc 52a is rotatably connected with the inner gear sleeve 51 through a bearing, the inner ring side of the bearing is fixedly sleeved on the inner gear sleeve 51, and the outer ring side of the bearing is clamped in the mounting ring groove.

In this embodiment, the second inner rotor motor 30 further includes a rear cover 34 fixedly mounted on the second stator 31, and an end of the second sun gear shaft 43 is rotatably mounted in a rear cover mounting hole on the rear cover 34; because the second planet carrier 44 is located inside the dual-motor driving device of the electric vehicle, in order to facilitate detection of rotation parameters of the second planet carrier 44, an axial through hole is formed in the second sun gear shaft 43, a connecting rod 61 fixedly connected with the second planet carrier 44 is inserted into the axial through hole, an installation end 62 rotatably installed in the rear cover installation hole is fixedly connected to one end, away from the second planet carrier 44, of the connecting rod 61, and the second detection feedback structure 60b is fixedly installed on the rear cover 34 and is arranged corresponding to the rear cover installation hole. Specifically, the fixed portion of the second detection feedback structure 60b is disposed on the rear cover 34, the rotating portion of the second detection feedback structure 60b is disposed on the mounting head 62, and typically, the second detection feedback structure 60b is an encoder or a sensor.

Since the first rotor 12 of the first inner rotor motor 10 is fixedly mounted on the first sun gear shaft 23, and the rotation parameters of the first sun gear shaft 23 are the same as those of the first rotor 12, in order to facilitate mounting and reduce the occupied space, the first detection feedback structure 60a is disposed between the first planet carrier 24 and the first rotor 12, specifically, a fixed portion of the first detection feedback structure 60a is disposed on the first planet carrier 24, and a rotating portion of the first detection feedback structure 60a is disposed on the first rotor 12, and generally, the first detection feedback structure 60a is an encoder or a sensor.

In the present embodiment, a cooling water passage 14 is provided on the first stator 11 for cooling.

In this embodiment, an external brake mechanism 70a is further installed between the first casing 21 and the first carrier 24, typically, the external brake mechanism 70a is an electromagnetic brake, the electromagnetic brake includes a brake mechanism housing, a friction disc installed on the brake mechanism housing for resetting the friction disc, an electromagnetic assembly installed inside the brake mechanism housing, an elastic resetting assembly for resetting the friction disc, and a brake disc, the brake disc is fixedly installed on the outer peripheral side of the first casing 21, the brake mechanism housing is fixedly installed on the first carrier 24 or the first stator 11, the electromagnetic assembly is energized to make the friction disc and the brake disc fit with each other, braking is performed by the friction force between the two, the friction disc and the brake disc are separated under the elastic force of the elastic resetting assembly after the power is cut off, of course, the external brake mechanism 70a may also be a hydraulic brake, and the structure and principle of the hydraulic brake or the electromagnetic brake are well known to those skilled in the art, and will not be described in detail herein.

Second embodiment

As can be seen from fig. 4, this embodiment is substantially the same as the first embodiment, except that:

the clutch mechanism is a hydraulic clutch 50c, a connecting disc 52b of the hydraulic clutch 50c is of an integral structure and is rotatably mounted with an inner gear sleeve 51 through a bearing, a plurality of oil cylinders 53 for driving the connecting disc 52b and the inner gear sleeve 51 to axially move are arranged between the connecting disc 52b and the second shell 41 of the hydraulic clutch 50c, generally, a second shell mounting hole is respectively arranged on the second shell 41 corresponding to each oil cylinder 53, and the oil cylinders 53 are correspondingly fixed in the second shell mounting holes.

Third embodiment

As can be seen from fig. 5 and 6, this embodiment is substantially the same as the first embodiment, except that:

the clutch mechanism is an electromagnetic clutch 90, the electromagnetic clutch 90 includes a clutch housing 91, a driven plate 92, and a driving plate 93, the driving plate 93 is fixedly connected with the first sun gear shaft 23, the driven plate 92 is fixedly connected with the second planet carrier 44, the driving plate 93 and the driven plate 92 are in torque-resistant connection capable of relatively rotating, a slip ring 94 is arranged on the second outer casing 41 to supply power to a coil of the electromagnetic clutch 90, and the structure and principle of the electromagnetic clutch are well known to those skilled in the art and are not described herein.

In operation, the first detection feedback structure 60a detects the rotation parameter of the first sun gear shaft 23 (in this embodiment, the rotation speed of the first sun gear shaft 23) and transmits the detection signal back to the drive control system of the electric vehicle, the drive control system of the electric vehicle starts the second inner rotor motor 30, the second detection feedback structure 60b detects the rotation parameter of the second planet carrier 44 (in this embodiment, the rotation speed of the second planet carrier 44) and transmits the detection signal back to the drive control system of the electric vehicle, the drive control system of the electric vehicle adjusts the rotation speed of the second inner rotor motor 30 until the rotation speed of the second planet carrier 44 of the second planetary reduction mechanism 40 mounted together with the second inner rotor motor 30 is the same as the rotation speed of the first sun gear shaft 23, and then the drive control system of the electric vehicle controls the electromagnetic clutch 90 to act, the first sun gear shaft 23 of the first planetary reduction mechanism 20 is fixedly connected with the second planet carrier 44 through the joint of the driving plate 93 and the driven plate 92, because the rotating speeds of the driving plate 93 and the driven plate 92 are the same when the driving plate 93 is jointed, the fluctuation generated at the moment of joint can be reduced to realize the synchronous joint between the first planetary reduction mechanism and the second planetary reduction mechanism, so that the gear shifting is smoother, and the driving torque can be improved by driving the electric automobile together through the first inner rotor motor 10 and the second inner rotor motor 30, so that the electric automobile is suitable for the situations of needing large torque in a starting stage, a low-speed climbing stage and the like; when the electric automobile runs at a high speed, the drive control system of the electric automobile controls the electromagnetic clutch 90 to act so as to separate the first sun gear shaft 23 from the second planet carrier 44, the first planet speed reducing mechanism and the second planet speed reducing mechanism can be separated, power is provided only through the first inner rotor motor 10, and therefore heat generation can be reduced and the failure rate can be reduced. The dual-motor driving device of the electric automobile solves the problems of insufficient power and large electric quantity consumption during high-speed running of the conventional electric automobile in a starting stage and a low-speed climbing stage, can improve driving torque when two motors are used simultaneously, can meet the requirement that the motors run in a high-efficiency interval section when the two motors are used independently, can reduce power consumption, and can avoid excessive heat generated by the motors and reduce failure rate.

Since the first casing 21 and the hub are attached, the first planetary reduction gear mechanism 20 is a power output member in which the first casing 21 is rotatably attached to the first carrier 24, and is suitable for a dual-hub electric vehicle, and as shown in fig. 5, the hub 80b and the hub 80c are fixedly attached to the first casing 21.

In this embodiment, in order to facilitate braking during high-speed driving, an internal brake mechanism 70b is disposed between the second housing 41 and the first sun gear shaft 23, a brake mechanism housing of the internal brake mechanism 70b is fixedly mounted on the second housing 41, a brake disc of the internal brake mechanism 70b is fixedly mounted on the first sun gear shaft 23, the internal brake mechanism 70b is an electromagnetic brake or a hydraulic brake, and the structure and principle of the hydraulic brake or the electromagnetic brake are well known to those skilled in the art and will not be described herein.

Fourth embodiment

As can be seen from fig. 7 and 8, this embodiment is substantially the same as the third embodiment, except that:

the first outer housing 21 of the first planetary reduction mechanism 20 is fixedly connected to the first stator 11 of the first inner rotor motor 10, the first carrier 24 is rotatable with respect to the first outer housing 21, and the first carrier 24 is used as a power output unit of the two-motor driving device of the electric vehicle, and when being mounted, the first carrier 24 is fixedly connected to the hub 80 d.

In the present embodiment, in order to facilitate braking at the time of high-speed travel, an internal braking mechanism 70b is provided between the first stator 11 of the first inner rotor motor 10 and the first sun gear shaft 23 of the first planetary reduction mechanism 20; the brake disk of the internal brake mechanism 70b is fixedly mounted on the first sun gear shaft 23, and the brake mechanism housing is fixedly mounted on the first stator 11 of the first inner rotor motor 10 or the second housing 41 of the second planetary reduction mechanism 40, specifically, the brake mechanism housing is clamped between the first stator 11 of the first inner rotor motor 10 and the second housing 41 of the second planetary reduction mechanism 40, and the internal brake mechanism 70b is usually an electromagnetic brake or a hydraulic brake.

Fifth embodiment

As can be seen from fig. 9 and 10, this embodiment is substantially the same as the fourth embodiment, except that:

a mounting shaft 46 coaxial with the second sun gear shaft 43 is provided on the side of the second carrier 44 close to the first inner rotor motor 10, carrier transmission tooth portions are provided on the mounting shaft 46, a clutch mechanism is mounted on the mounting shaft 46, the clutch mechanism is a hydraulic clutch 50b and includes an inner sleeve 51 for connecting the sun gear shaft transmission tooth portions and the carrier transmission tooth portions, a connecting plate 52b rotatably mounted on the outer peripheral side of the inner sleeve 51, and a plurality of oil cylinders 53 provided between the second housing 41 and the connecting plate 52b, specifically, the connecting plate 52b is an integrated structure and rotatably mounted with the inner sleeve 51 by a bearing, in order to facilitate the mounting of the connecting plate 52b with the outer ring side of the bearing and the inner sleeve 51 with the inner ring side of the bearing, an annular notch is provided on the outer peripheral side of the inner sleeve 51 close to the side of the first inner rotor motor 10, the inner ring side of the bearing is arranged in the annular gap, and a baffle ring 57 for fixing the bearing is fixedly arranged on the inner gear sleeve 51.

In this embodiment, in order to facilitate braking during high-speed driving, an inner brake mechanism 70c is disposed between the first stator 11 and the first rotor 12 of the first inner rotor motor 10, a brake mechanism housing of the inner brake mechanism 70c is fixedly mounted on the first stator 11 or the second housing 41, a brake disc is fixedly mounted on the first rotor 12, a space is left between a brake disc mounting hole sidewall of the brake disc and the first sun gear shaft 23, and the inner sleeve 51 can be inserted into a space between the brake disc mounting hole sidewall and the first sun gear shaft 23 when sliding, specifically, the brake mechanism housing is clamped between the first stator 11 and the second housing 41, and the inner brake mechanism 70c is usually an electromagnetic brake or a hydraulic brake.

Sixth embodiment

As can be seen from fig. 11, this embodiment is substantially the same as the fifth embodiment, except that:

the clutch mechanism 100 is a hydraulic clutch 50d, the hydraulic clutch 50d includes a brake disc 58a sleeved on the sun gear transmission tooth portion for connecting the sun gear transmission tooth portion and the planet carrier transmission tooth portion, a plurality of engaging teeth 581 for engaging with the sun gear transmission tooth portion and the planet carrier transmission tooth portion are arranged on the inner side wall of the brake disc mounting sleeve portion of the brake disc 58a, the hydraulic clutch further includes a clamp 58b clamped on the brake disc 58a, a plurality of oil cylinders (not shown in the figure) for pushing the brake disc 58a and the clamp 58b to move axially, and a guide shaft 59 arranged between the first inner rotor motor 10 and the second planetary reduction mechanism 40 and parallel to the first sun gear shaft 23 and the second sun gear shaft 43, and the clamp 58b is slidably mounted on the guide shaft 59. The clutch can play a role in clutching and a role in braking.

Seventh embodiment

As can be seen from fig. 12, this embodiment is substantially the same as the fifth embodiment, except that:

the double-motor driving device of the electric automobile is directly and fixedly installed on a vehicle driving axle, specifically, the vehicle driving axle comprises a driving axle shell 100 and a differential gear 110 installed in the driving axle shell 100, two output shafts 130 connected to the differential gear 110 and an input shaft 120 connected to the differential gear 110 are installed on the driving axle shell 100, the output shaft 130 on each side is respectively and fixedly connected with a hub of a wheel on the corresponding side, a first stator 11 is fixedly connected with the driving axle shell 100, and a first planet carrier 24 is fixedly connected with the input shaft 120, so that two wheels on two sides of the vehicle driving axle can be driven simultaneously.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-motor driving device of an electric automobile is characterized by comprising a first inner rotor motor, a first planetary speed reducing mechanism arranged at one end of the first inner rotor motor, a second inner rotor motor arranged at the other end of the first inner rotor motor, and a second planetary speed reducing mechanism arranged between the second inner rotor motor and the first inner rotor motor;

the second inner rotor motor comprises a second stator fixedly connected with the second shell and the first stator, a second rotor sleeved with the second stator, and a rear cover fixedly installed with the second stator, and the second rotor is fixedly installed on the second sun gear shaft;

2. The dual-motor driving device of the electric automobile as claimed in claim 1, wherein a sun gear shaft transmission tooth part is arranged at the end of the first sun gear shaft, and a planet gear carrier transmission tooth part is correspondingly arranged on the second planet gear carrier; the clutch mechanism is a hydraulic clutch and comprises an inner gear sleeve used for connecting the sun gear shaft transmission tooth part and the planet gear carrier transmission tooth part, a connecting disc rotatably arranged on the outer peripheral side of the inner gear sleeve, and an oil cylinder fixedly connected with the connecting disc and used for driving the inner gear sleeve to move axially.

3. The dual-motor driving device of the electric vehicle as claimed in claim 1, wherein the clutch mechanism is an electromagnetic clutch, the electromagnetic clutch includes a clutch housing, a driven plate, and a driving plate, the driving plate is fixedly connected to the first sun gear shaft, the driven plate is fixedly connected to the second planetary carrier, the driving plate and the driven plate are in a relatively rotatable anti-torque connection, and a slip ring for supplying power to a coil of the electromagnetic clutch is disposed on the second housing.

4. The electric vehicle dual-motor driving device as claimed in claim 1, wherein an internal braking mechanism is disposed between the second housing and the first sun gear shaft/between the first stator and the first rotor, and the internal braking mechanism is an electromagnetic brake or a hydraulic brake.

5. The electric automobile double-motor driving device as claimed in claim 1, wherein the second detection device is fixedly mounted on the rear cover, an axial through hole is formed in the second sun gear shaft, a connecting rod fixedly connected with the second planet carrier penetrates through the axial through hole, and the end, far away from the second planet carrier, of the connecting rod is in transmission connection with the second detection feedback device; when the first planet carrier is fixedly connected with the first stator, the first detection feedback structure is arranged between the first planet carrier and the first rotor, and when the first shell is fixedly connected with the first stator, the first detection feedback structure is arranged between the first shell and the first rotor.