CN114771227A

CN114771227A - Coaxial electric drive system and vehicle

Info

Publication number: CN114771227A
Application number: CN202210522226.2A
Authority: CN
Inventors: 宋鹏飞; 高方
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-07-22

Abstract

The invention relates to the technical field of automobiles, and particularly discloses a coaxial electric drive system and a vehicle. According to the coaxial electric drive system provided by the invention, the motor assembly, the differential mechanism and the speed reducing mechanism are all arranged in one shell assembly, so that the integration of the motor, the differential mechanism and the speed reducing mechanism is realized, the two speed reducing mechanisms on the left side and the right side are symmetrically arranged and integrated in the shell assembly, and the axial distance can be greatly reduced; two output ends of the coaxial electric drive system are symmetrically arranged, so that the whole vehicle is conveniently arranged; the planet carrier and the shell assembly are integrally designed, so that the types and the number of parts are effectively reduced. The coaxial electric drive system provided by the invention has the advantages that the axial occupied space is shortened through the highly integrated design, the requirement on the arrangement space is less, the arrangement of other components is not influenced, and the coaxial electric drive system is suitable for various vehicle types.

Description

Coaxial electric drive system and vehicle

Technical Field

The invention relates to the technical field of automobiles, in particular to a coaxial electric drive system and a vehicle.

Background

In recent years, the research of domestic electric vehicle power systems focuses more on the directions of high integration level, light system weight, easy system maintenance and high reliability.

At present, an electric drive system is mostly in a parallel shaft arrangement structure, the electric drive arrangement mode is limited, a large arrangement space is needed, and the arrangement space of a battery or the storage space of an automobile can be occupied. The rear-guard of a few motorcycle types adopts coaxial electricity to drive the system, can optimize the arrangement space of whole car direction of height and fore-and-aft direction, but present coaxial electricity drive system mostly is reduction gears and motor series arrangement, and axial occupation space is great, is unfavorable for matching multiple type whole car.

Therefore, it is desirable to provide a coaxial electric drive system to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a coaxial electric drive system and a vehicle, which realize high-integration design, reduce axial occupied space and are suitable for various vehicle types.

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

providing a coaxial electric drive system comprising:

a housing assembly;

a motor assembly disposed within the housing assembly, the motor assembly including a rotor;

the differential mechanism is arranged in the shell assembly, and the input end of the differential mechanism is in driving connection with the rotor;

the two groups of speed reducing mechanisms are arranged in the shell assembly, the differential mechanism is provided with two output ends, and the input end of each speed reducing mechanism is correspondingly connected with the output end of the differential mechanism in a driving way;

the planetary carrier is provided with two, and two the planetary carrier rotatable closure casing assembly two opposite openings, the planetary carrier is configured with reduction gears's output and transmission shaft drive connection.

As an alternative to the above coaxial electric drive system, the differential mechanism comprises:

a support plate connected with the rotor;

the first planet wheel is rotationally connected with the supporting plate, a first input shaft is meshed with the first planet wheel, and the first input shaft is in driving connection with the input end of one group of the speed reducing mechanisms;

and the second planet wheel is rotationally connected with the supporting plate, meshed with the first planet wheel, meshed with a second input shaft, and in driving connection with the input end of the other group of speed reducing mechanisms.

As an optional technical solution of the above coaxial electric drive system, a first pin is provided on the support plate, and the first planet gear is rotatably disposed on the first pin through a needle bearing;

and a second pin shaft is arranged on the supporting plate, and the second planet wheel is rotatably arranged on the second pin shaft through a needle bearing.

As an alternative to the above-mentioned coaxial electric drive system, the first input shaft and the second input shaft are rotatably supported in the housing assembly by needle bearings, and are axially positioned in the housing assembly by thrust bearings.

As an alternative to the above coaxial electric drive system, the support plate is rotatably supported in the housing assembly through a support bearing.

As an alternative to the above coaxial electric drive system, the speed reduction mechanism includes:

the input end of the speed reduction gear set is in driving connection with the output end of the differential mechanism;

and the gear ring is fixedly arranged in the shell assembly, and the inner teeth of the gear ring are meshed with the reduction gear set.

As an alternative to the above-described coaxial electric drive system, the reduction gear set comprises:

the primary reduction gear is in driving connection with the output end of the differential mechanism;

and the secondary reduction gear is rotationally connected with the planet carrier, the primary reduction gear is fixedly connected with the secondary reduction gear, and the secondary reduction gear is meshed with the internal teeth of the gear ring.

As an optional technical solution of the above coaxial electric drive system, the planet carrier is provided with a third pin shaft, and the second-stage reduction gear is rotatably disposed on the third pin shaft through a needle bearing.

As an optional technical scheme of the coaxial electric drive system, an oil seal and a support bearing are sequentially arranged at the opening of the shell assembly from outside to inside, the planet carrier passes through the support bearing is rotatably arranged at the opening of the shell assembly, and the planet carrier passes through the oil seal which seals the opening of the shell assembly.

The vehicle comprises two transmission shafts, two wheels and the coaxial electric driving system, wherein one end of each transmission shaft is connected with a planet carrier, and the other end of each transmission shaft is connected with the corresponding wheel.

The invention has the beneficial effects that:

according to the coaxial electric drive system provided by the invention, the motor assembly, the differential mechanism and the speed reducing mechanism are all arranged in one shell assembly, so that the integration of the motor, the differential mechanism and the speed reducing mechanism is realized, the two speed reducing mechanisms on the left side and the right side are symmetrically arranged and integrated in the shell assembly, and the axial distance can be greatly reduced; the two output ends of the coaxial electric drive system are symmetrically arranged, so that the whole vehicle is conveniently arranged; the planet carrier and the shell assembly are integrally designed, so that the types and the number of parts are effectively reduced. The coaxial electric drive system provided by the invention has the advantages that the axial occupied space is shortened through the highly integrated design, the requirement on the arrangement space is less, the arrangement of other components is not influenced, and the coaxial electric drive system is suitable for various vehicle types.

Drawings

FIG. 1 is a partial cross-sectional view of an in-line electric drive system provided by an embodiment of the present invention;

fig. 2 is a schematic view of a mounting structure of a first planet wheel and a second planet wheel provided by the embodiment of the invention;

fig. 3 is a schematic structural diagram of a coaxial electric drive system coupled to a wheel according to an embodiment of the present invention.

In the figure:

1. a housing assembly; 2. a motor assembly; 3. a differential mechanism; 4. a speed reduction mechanism; 5. a planet carrier; 6. a needle bearing; 7. a thrust bearing; 8. a support bearing; 9. oil sealing;

11. a left housing; 12. a right housing;

21. a rotor; 22. a stator;

31. a support plate; 311. a left support plate; 312. a right support plate; 32. a first planet gear; 33. a first input shaft; 34. a second planet wheel; 35. a second input shaft; 36. a first pin shaft; 37. a second pin shaft;

411. a primary reduction gear; 412. a secondary reduction gear; 42. a ring gear; 43. a third pin shaft;

100. a drive shaft; 200. and (4) a wheel.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

To among the prior art, coaxial electricity drives the system and mostly is speed reducing mechanism and motor series arrangement, and axial occupation space is great, is unfavorable for matching the problem of multiple type whole car, and this embodiment provides a coaxial electricity drives system in order to solve above-mentioned technical problem.

Specifically, in the present embodiment, as shown in fig. 1 to 3, the coaxial electric drive system includes a housing assembly 1, and a motor assembly 2, a differential mechanism 3 and a speed reduction mechanism 4 are disposed in the housing assembly 1. The motor assembly 2 comprises a rotor 21, and the input end of the differential mechanism 3 is in driving connection with the rotor 21. The two groups of speed reducing mechanisms 4 are arranged in the shell assembly 1, the differential mechanism 3 is provided with two output ends, and the input end of each speed reducing mechanism 4 is in corresponding driving connection with the output end of the differential mechanism 3. The casing assembly 1 is provided with two oppositely arranged openings, each opening is provided with a planet carrier 5, the planet carriers 5 can rotate to close the openings, and the planet carriers 5 are configured to be in driving connection with the output end of the speed reducing mechanism 4 and the transmission shaft 100.

In the coaxial electric drive system provided by the embodiment, the motor assembly 2, the differential mechanism 3 and the speed reducing mechanism 4 are all arranged in the shell assembly 1, so that the integration of the motor, the differential mechanism 3 and the speed reducing mechanism 4 is realized, and the two speed reducing mechanisms 4 on the left side and the right side are symmetrically arranged and integrated in the shell assembly 1, so that the axial distance can be greatly reduced; two output ends of the coaxial electric drive system are symmetrically arranged, so that the whole vehicle is conveniently arranged; the planet carrier 5 and the shell assembly 1 are integrally designed, so that the types and the number of parts are effectively reduced. The coaxial electricity that this embodiment provided drives the system through highly integrated's design, has shortened the space that the axial occupy, arranges that the space demand is few, does not influence arranging of other parts, and applicable in multiple motorcycle type.

In this embodiment, the housing assembly 1 includes a left housing 11 and a right housing 12, and openings have been opened on the left housing 11 and the right housing 12, and the two openings are opposite and symmetrically disposed. The opening part outside-in is equipped with oil blanket 9 and support bearing 8 in proper order, and planet carrier 5 sets up in the opening part through support bearing 8, and planet carrier 5 passes through the sealed opening of oil blanket 9.

Further, the support bearing 8 is fixed to the left housing 11 or the right housing 12 by a snap ring.

The motor assembly 2 further includes a stator 22, the stator 22 being mounted within the housing assembly 1. The motor assembly 2 also includes other structures, but all are in the prior art, and will not be described in detail herein.

The differential mechanism 3 includes a support plate 31, and the support plate 31 is connected to the rotor 21. A first planet wheel 32 and a second planet wheel 34 are connected to the support plate 31 in a rotating mode, the first planet wheel 32 is meshed with the second planet wheel 34, a first input shaft 33 is meshed with the first planet wheel 32, and the first input shaft 33 is in driving connection with the input end of one set of the speed reducing mechanisms 4. The second planet wheel 34 is engaged with a second input shaft 35, and the second input shaft 35 is in driving connection with the input end of another group of the speed reducing mechanisms 4, so that double-shaft output is realized.

The support plate 31 includes right support plate 312 and left support plate 311 that the cross-section is T shape, and right support plate 312 is fixed to be set up on left support plate 311, and the diaphragm and the rotor 21 of left support plate 311 are connected, and the riser of left support plate 311 and right support plate 312 form the structure that the cross-section is the U-shaped, and the both ends of first planet wheel 32 and the both ends of second planet wheel 34 rotate with the riser and the right support plate 312 of left support plate 311 respectively and are connected.

The right support plate 312 may be connected to the left support plate 311 by welding, or may be connected to the left support plate 311 by screwing or riveting, which is not particularly limited herein.

In the present embodiment, the support plate 31 is rotatably supported in the housing assembly 1 by the support bearing 8. It is ensured that the support plate 31 can rotate smoothly with the rotor 21 in the housing assembly 1, and it is also possible to provide a supporting force for both the support plate 31 and the rotor 21.

The supporting plate 31 is provided with a first pin 36, and specifically, two ends of the first pin 36 are fixedly connected to the left supporting plate 311 and the right supporting plate 312 respectively. The first planet gear 32 is rotatably arranged on the first pin shaft 36 through the needle bearing 6, and the connection structure is simple and easy to realize.

The support plate 31 is provided with a second pin 37, and specifically, two ends of the second pin 37 are fixedly connected with the left support plate 311 and the right support plate 312 respectively. The second planet wheel 34 is rotatably arranged on the second pin shaft 37 through the needle bearing 6, and the connection structure is simple and easy to realize.

The first input shaft 33 and the second input shaft 35 are arranged in the housing assembly 1, the axial directions of the first input shaft 33 and the second input shaft 35 extend along the length direction of the housing assembly 1, one end of the first input shaft 33 extends along the direction perpendicular to the axial direction and is meshed with the first planet wheels 32, one end of the second input shaft 35 extends along the direction perpendicular to the axial direction and is meshed with the second planet wheels 34, namely, the first input shaft 33 and the first planet wheels 32 as well as the second input shaft 35 and the second planet wheels 34 are arranged in the width direction of the housing assembly 1, the space occupied by the coaxial electric drive system in the axial direction is reduced,

further, the first input shaft 33 and the second input shaft 35 are rotatably supported in the housing assembly 1 through the needle roller bearings 6, and are axially positioned in the housing assembly 1 through the thrust bearings 7, so that the first input shaft 33 or the second input shaft 35 is prevented from axially shifting, and the meshing of the first input shaft 33 and the first planetary gear 32 or the meshing of the second input shaft 35 and the second planetary gear 34 is prevented from being affected.

In the present embodiment, the speed reducing mechanism 4 includes a speed reducing gear set rotatably disposed on the planet carrier 5, and an input end of the speed reducing gear set is in driving connection with an output end of the differential mechanism 3. A gear ring 42 is fixedly arranged in the shell assembly 1, and the internal teeth of the gear ring 42 are meshed with the reduction gear set. Specifically, the input end of the reduction gear set meshes with the first input shaft 33 or the second input shaft 35. The speed reduction gear set and the gear ring 42 form a planetary speed reduction mechanism, the first input shaft 33 or the second input shaft 35 drives the speed reduction gear set to rotate along the gear ring 42, and power is transmitted to the planet carrier 5, so that the planet carrier 5 is driven to rotate.

Further, the reduction gear set includes a first reduction gear 411 and a second reduction gear 412, the first reduction gear 411 is in driving connection with the output end of the differential mechanism 3, the second reduction gear 412 is in rotating connection with the planet carrier 5, the first reduction gear 411 is fixedly connected with the second reduction gear 412, and the second reduction gear 412 is meshed with the internal teeth of the ring gear 42. This embodiment sets up the two-stage speed reduction, has increased bearing capacity, and the reliability is high, satisfies the motor vehicle owner back drive demand completely.

The second reduction gear 412 extends along the length direction of the housing assembly 1, one end of the second reduction gear 412 is engaged with the first reduction gear 411, and the other end of the second reduction gear 412 extends towards the inside of the housing assembly 1 to be engaged with the internal teeth of the gear ring 42, so as to effectively control the axial distance of the coaxial electric drive system.

In this embodiment, the planet carrier 5 is provided with a third pin 43, and two ends of the third pin 43 are fixedly connected with the planet carrier 5. The second reduction gear 412 is rotatably disposed on the third pin 43 through the needle bearing 6. Drive power through the transmission of third round pin axle 43 to planet carrier 5 on, connection structure is simple, and can be effectively with drive power transmission to planet carrier 5 on.

As shown in fig. 3, the present embodiment further provides a vehicle including the coaxial electric drive system described above, and further including two propeller shafts 100 and two wheels 200. One end of the transmission shaft 100 is connected to the planetary carrier 5, and the other end of the transmission shaft 100 is connected to the wheel 200.

When the vehicle runs straight, the rotor 21 drives the support plate 31 to rotate, and simultaneously drives the first planet wheel 32 and the second planet wheel 34 to rotate, and the first planet wheel 32 and the second planet wheel 34 are relatively static. The driving force is transmitted to the first input shaft 33 and the second input shaft 35 through the first planetary gear 32 and the second planetary gear 34, respectively, and the first input shaft 33 and the second input shaft 35 output the same rotational speed and torque. The first input shaft 33 and the second input shaft 35 respectively transmit the driving force to the corresponding first-stage reduction gear 411 and then to the second-stage reduction gear 412, the second-stage reduction gear 412 is meshed with the gear ring 42, the gear ring 42 is fixed on the housing assembly 1, the driving force is transmitted to the planet carrier 5 through the third pin shaft 43, and the planet carrier 5 rotates to drive the transmission shaft 100 to rotate, so as to drive the wheel 200 to rotate.

When the vehicle turns left, the rotation speed of the left wheel 200 is reduced relative to the rotation speed of the right wheel 200, at this time, the first planet wheel 32 rotates counterclockwise (as viewed from the left side of the whole vehicle), the output rotation speed of the first input shaft 33 is reduced, and meanwhile, because the first planet wheel 32 is meshed with the second planet wheel 34, the second planet wheel 34 rotates clockwise, so that the output rotation speed of the second input shaft 35 is increased and is transmitted to the wheels 200 through the speed reducing mechanisms 4 with fixed speed ratios respectively, and the wheels 200 on the two sides have differential speed. When the vehicle turns right, the operation principle is contrary to that of the vehicle turning left, and will not be described in detail.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A coaxial electric drive system, comprising:

a housing assembly (1);

a motor assembly (2) disposed within the housing assembly (1), the motor assembly (2) including a rotor (21);

the differential mechanism (3) is arranged in the shell assembly (1), and the input end of the differential mechanism (3) is in driving connection with the rotor (21);

two groups of speed reducing mechanisms (4) are arranged in the shell assembly (1), the differential mechanism (3) is provided with two output ends, and the input end of each speed reducing mechanism (4) is correspondingly connected with the output end of the differential mechanism (3) in a driving way;

the two planetary carriers (5) are arranged, the two planetary carriers (5) can rotatably close two opposite openings of the shell assembly (1), and the planetary carriers (5) are configured to be in driving connection with the output end of the speed reducing mechanism (4) and the transmission shaft (100).

2. Coaxial electric drive system according to claim 1, characterized in that the differential mechanism (3) comprises:

a support plate (31) connected to the rotor (21);

the first planet wheel (32) is rotationally connected with the supporting plate (31), a first input shaft (33) is meshed with the first planet wheel (32), and the first input shaft (33) is in driving connection with the input end of one group of the speed reducing mechanisms (4);

the second planet wheel (34) is connected with the supporting plate (31) in a rotating mode, the second planet wheel (34) is meshed with the first planet wheel (32), the second planet wheel (34) is meshed with a second input shaft (35), and the second input shaft (35) is in driving connection with the input end of the speed reducing mechanism (4).

3. The coaxial electric drive system according to claim 2, characterized in that a first pin (36) is provided on the support plate (31), the first planet gear (32) being rotatably arranged on the first pin (36) via a needle bearing (6);

and a second pin shaft (37) is arranged on the support plate (31), and the second planet wheel (34) is rotatably arranged on the second pin shaft (37) through a needle bearing (6).

4. The coaxial electric drive system according to claim 2, characterized in that the first input shaft (33) and the second input shaft (35) are each rotatably supported in the housing assembly (1) by means of a needle bearing (6) and are each axially positioned in the housing assembly (1) by means of a thrust bearing (7).

5. The coaxial electric drive system of claim 2, characterized in that the support plate (31) is rotatably supported within the housing assembly (1) by a support bearing (8).

6. The coaxial electric drive system according to claim 1, characterized in that the reduction mechanism (4) comprises:

the reduction gear set is rotationally arranged on the planet carrier (5), and the input end of the reduction gear set is in driving connection with the output end of the differential mechanism (3);

and the gear ring (42) is fixedly arranged in the shell assembly (1), and the internal teeth of the gear ring (42) are meshed with the reduction gear set.

7. The coaxial electric drive system of claim 6, wherein the reduction gear set comprises:

the primary reduction gear (411) is in driving connection with the output end of the differential mechanism (3);

the secondary reduction gear (412) is rotationally connected with the planet carrier (5), the primary reduction gear (411) is fixedly connected with the secondary reduction gear (412), and the secondary reduction gear (412) is meshed with the inner teeth of the gear ring (42).

8. The coaxial electric drive system according to claim 7, characterized in that a third pin (43) is provided on the planet carrier (5), and the secondary reduction gear (412) is rotatably arranged on the third pin (43) via a needle bearing (6).

9. The coaxial electric drive system according to claim 1, wherein an oil seal (9) and a support bearing (8) are sequentially arranged at the opening of the housing assembly (1) from outside to inside, the planet carrier (5) is rotatably arranged at the opening of the housing assembly (1) through the support bearing (8), and the planet carrier (5) seals the opening of the housing assembly (1) through the oil seal (9).

10. A vehicle, characterized in that it comprises two transmission shafts (100), two wheels (200) and an in-line electric drive system according to any of claims 1 to 9, one end of said transmission shafts (100) being connected to a planet carrier (5) and the other end of said transmission shafts (100) being connected to said wheels (200).