CN115195435A

CN115195435A - Coaxial drive arrangement and vehicle

Info

Publication number: CN115195435A
Application number: CN202211054426.6A
Authority: CN
Inventors: 占华龙; 任亚楠; 蓝晓东; 李超
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2022-10-18

Abstract

The invention provides a coaxial driving device and a vehicle, wherein the coaxial driving device comprises: the device comprises a shell support frame, a driving motor, a composite planet carrier, an NW planet row gear train and a differential gear train; the driving motor is arranged on the shell supporting frame; the composite planet carrier is rotatably arranged on the shell supporting frame; the NW planetary gear train is arranged on the compound planet carrier, a rotation center inner cavity is arranged in the NW planetary gear train, and the NW planetary gear train is connected with the driving motor; the differential gear train is arranged on the composite planet carrier and is positioned in the rotary central cavity, and the outer diameter of the running track of the differential gear train is larger than the inner diameter of the running track of the NW planetary gear train; the driving motor, the compound planet carrier, the NW planet row gear train and the differential gear train are coaxially arranged. The coaxial driving device is used for solving the problem that the existing coaxial driving device is large in radial and axial sizes.

Description

Coaxial drive arrangement and vehicle

Technical Field

The invention relates to the field of vehicle driving, in particular to a coaxial driving device and a vehicle.

Background

With further tightening of global carbon emission policies and increasing of popularization strength of national pure electric new energy automobiles, an electric drive assembly with better performance and arrangement needs to be sought so as to be applied to development of pure electric automobile types. At present, an electric drive power assembly is divided into two types of a parallel shaft and a coaxial shaft, the coaxial shaft has the characteristics of convenient arrangement, particularly the coaxial planetary row also has the characteristics of high power density and the like. However, the conventional coaxial driving device has the problems of large radial dimension and large axial dimension.

Disclosure of Invention

In view of the above disadvantages of the prior art, the present invention provides a coaxial driving device and a vehicle, so as to solve the problem of large radial and axial dimensions of the conventional coaxial driving device.

To achieve the above and other related objects, the present invention provides a coaxial driving apparatus, comprising: the device comprises a shell support frame, a driving motor, a composite planet carrier, an NW planet row gear train and a differential gear train; the driving motor is arranged on the shell supporting frame; the compound planet carrier is rotatably arranged on the shell supporting frame; the NW planetary gear train is arranged on the compound planet carrier, a rotation center inner cavity is arranged in the NW planetary gear train, and the NW planetary gear train is connected with the driving motor; the differential gear train is arranged on the composite planet carrier and is positioned in the rotary central cavity, and the outer diameter of the running track of the differential gear train is larger than the inner diameter of the running track of the NW planetary gear train; the driving motor, the compound planet carrier, the NW planet row gear train and the differential gear train are coaxially arranged.

In one embodiment of the present invention, the differential gear train includes: differential planet wheel and side gear, differential planet wheel rotate install in on the compound planet carrier, differential planet wheel with side gear meshes.

In one embodiment of the present invention, the NW planetary gear train includes: the sun gear is connected with an output shaft of the driving motor, the tower type duplex gear planet gear is meshed with the sun gear, and the inner gear ring is meshed with the tower type duplex gear planet gear.

In an embodiment of the present invention, the ring gear is mounted on the housing support frame, and the compound planet carrier is located inside the ring gear.

In an embodiment of the present invention, the differential gear train includes a plurality of differential planet wheels, the NW planet gear train includes a plurality of tower double-tooth planet wheels, and the number of the tower double-tooth planet wheels corresponds to the number of the differential planet wheels.

In an embodiment of the present invention, the number of the tower-type double-tooth planet wheels is equal to the number of the differential planet wheels.

In an embodiment of the invention, each tower-type duplex-tooth planet wheel comprises a large planet wheel and a small planet wheel, the large planet wheel is coaxially connected with the small planet wheel, the large planet wheel is meshed with the sun wheel, the small planet wheel is meshed with the inner gear ring, and the small planet wheels and the differential planet wheels are alternately arranged at equal intervals.

In an embodiment of the present invention, the compound planet carrier includes a planet carrier housing, and the planet carrier housing is provided with a first planet carrier supporting position, a large planet wheel supporting position, a small planet wheel supporting position, a sun wheel supporting position, and a differential planet wheel supporting position.

In an embodiment of the present invention, the housing support frame includes: the motor comprises a shell, wherein a second planet carrier supporting position, a first motor rotor supporting position, a second motor rotor supporting position, an inner gear ring supporting position and a motor stator supporting position are arranged on the shell.

A vehicle is provided with the coaxial driving device.

According to the coaxial driving device, the differential gear train is positioned in the rotation central cavity of the NW planet row gear train, the differential gear train is embedded into the planet row to realize smaller axial size, and the smaller axial size is favorable for arrangement of a driving half shaft of the whole vehicle and arrangement of a front wheel steering engine. Meanwhile, the outer diameter of the running track of the differential gear train is larger than the inner diameter of the running track of the NW planetary gear train, so that the radial size of the whole device is reduced, a smaller radial size can bring a higher ground clearance, a free Z-direction arrangement space is provided, and the motor controller is more convenient to integrate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a coaxial driving apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an NW planetary gear train according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a differential gear train according to an embodiment of the present invention;

fig. 4 is a layout of the planetary gear of the present invention;

FIG. 5 is a schematic diagram of a compound carrier according to an embodiment of the present invention;

FIG. 6 is a schematic view of a housing support according to an embodiment of the present invention;

description of the element reference numerals

1. A coaxial drive; 2. an NW planet gear train; 21. a sun gear; 22. a tower type duplex-tooth planet wheel; 221. a large planet wheel; 222. a small planet wheel; 23. an inner gear ring; 3. a differential gear train; 31. a differential planet wheel; 32. a side gear; 33. ball-jointing; 4. a compound planet carrier; 41. a planet carrier housing; 42. a first carrier support station; 43. a small planet wheel supporting position; 44. a large planet wheel supporting position; 45. a sun gear support location; 46. a differential planet wheel support; 5. a drive motor; 51. a motor stator; 52. a motor rotor; 6. a housing support frame; 61. a second planet carrier support location; 62. a first motor rotor support location; 63. a second motor rotor support location; 64. an inner gear ring supporting position; 65. motor stator support position.

Detailed Description

The following embodiments of the present invention are provided by specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not noted in the following examples are generally performed under conventional conditions or conditions recommended by each manufacturer.

It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are for clarity of description only, and are not intended to limit the scope of the invention, and that changes or modifications in the relative relationship may be made without substantial technical changes and modifications.

Referring to fig. 1 to 4, to achieve the above and other related objects, the present invention provides a coaxial driving apparatus 1, including: the device comprises a shell support frame 6, a driving motor 5, a composite planet carrier 4, an NW planet row gear train 2 and a differential gear train 3; wherein, the driving motor 5 is arranged on the shell support frame 6; the compound planet carrier 4 is rotatably arranged on the shell supporting frame 6; the NW planetary gear train 2 is installed on the compound planet carrier 4, a rotation center inner cavity is arranged inside the NW planetary gear train 2, and the NW planetary gear train 2 is connected with the driving motor 5; the differential gear train 3 is arranged on the compound planet carrier 4 and is positioned in the rotary central cavity, and the outer diameter of the running track of the differential gear train 3 is larger than the inner diameter of the running track of the NW planet row gear train 2; the drive motor 5, the compound carrier 4, the NW planetary gear train 2, and the differential gear train 3 are coaxially disposed.

Referring to fig. 3, in an embodiment of the present invention, the differential gear train 3 includes: differential planet wheels 31 and a side gear 32, wherein the differential planet wheels 31 are rotatably arranged on the compound planet carrier 4, and the differential planet wheels 31 are meshed with the side gear 32.

Referring to fig. 2 and 4, in an embodiment of the present invention, the NW planetary gear train 2 includes: the sun gear 21 is connected with an output shaft of the driving motor 5, the tower-type double-tooth planet gear 22 is meshed with the sun gear 21, and the inner gear ring 23 is meshed with the tower-type double-tooth planet gear 22.

Referring to fig. 1 to 4, the nw planetary gear train 2 is disposed coaxially with the differential gear train 3, the compound planet carrier 4 and the driving motor 5, and the differential gear train 3 is disposed in the inner cavity of the rotation center thereof. The NW planetary gear train 2 includes a sun gear 21, a tower-type double-tooth planetary gear 22, and an annular gear 23. The sun gear 21 is connected with the motor rotor 52 in an integrally rotating manner, and the connection manner includes a spline, namely, the sun gear is arranged on the motor rotor in a spline manner, and an integral shaft, namely, a sun rotor is processed with a sun gear tooth form and the like. The tower double-pinion planetary gear 22 comprises large planetary gears 221 and small planetary gears 222, the number of the large planetary gears 221 and the number of the small planetary gears 222 are equal to that of the differential planetary gears 31 of the differential gear train 3, the preferred number is 3, the large planetary gears 221 and the small planetary gears 222 are uniformly arranged in the circumferential direction, the large planetary gears 221 are meshed with the sun gear 21, the small planetary gears 222 are meshed with the inner gear ring 23, two sides of the small planetary gears are supported on the composite planetary carrier 4 in a rolling bearing mode, and two sides of the small planetary gears are respectively arranged on the tower planetary gear supporting positions 43 and the tower planetary gear supporting positions 44. The inner gear ring 23 is arranged on the housing support frame 6 in a circumferential and axial fixed connection manner, and in order to realize floating load balancing when engaged with the small planet wheels 222, an inner gear ring floating manner is adopted, that is, the inner gear ring is allowed to float in the radial direction. The compound planet carrier 4 is located inside the ring gear 23.

Referring to fig. 1, 3 and 4, in an embodiment of the present invention, the differential gear train 3 includes a plurality of differential planet wheels 31, the NW planet gear train 2 includes a plurality of tower-type double-tooth planet wheels 22, and the number of the tower-type double-tooth planet wheels 22 corresponds to the number of the differential planet wheels 31. Correspondingly, the number of the differential planet wheels 31 can be integral multiple of the number of the tower type duplex-tooth planet wheels 22, and the integral is greater than or equal to 1.

Referring to fig. 1 to 4, the differential gear train 3 is disposed coaxially with the NW planetary gear train 2, the compound carrier 4 and the driving motor 5, supported on the compound carrier 4 by a sliding bearing, in the rotation center cavity of the NW planetary gear train 2, and includes differential planet wheels 31, a side gear 32 and a ball 33, the number of the differential planet wheels 31 is equal to the number of the tower-type double-tooth planet wheels 22, preferably 3, and circumferentially alternate with the tower-type double-tooth planet wheels 22, and is supported on the differential planet wheel support holes 46 of the compound carrier 4 and the ball 33 in a relative rotation manner, and the connection manner may be a rolling bearing or a sliding bearing, preferably a sliding bearing, the side gear 32 is meshed with all the differential planet wheels 31, the meshing tooth profile is preferably a straight bevel gear, and outputs power from the driving motor 5 to the wheel end, or drives the motor 5 with energy feedback value from the wheel end. By adopting the design that the number of planet gears in the planet row is equal to that of the planet gears in the differential mechanism, the planet gears in the planet row and the planet gears in the differential mechanism can be arranged at equal angular intervals in the circumferential direction, so that better dynamic balance is realized; meanwhile, the planet gears of the planet row can avoid the interference of the composite planet carrier, and the smaller radial size is realized by utilizing the window space of the differential planet gear.

Referring to fig. 2 and fig. 3, in an embodiment of the present invention, each of the tower-type double-cogged planet wheels 22 includes a large planet wheel 221 and a small planet wheel 222, the large planet wheel 221 is coaxially connected with the small planet wheel 222, the large planet wheel 221 is engaged with the sun wheel 21, and the small planet wheel 222 is engaged with the inner gear ring 23. A gap is formed between every two adjacent differential planet wheels 31, a plurality of gaps are formed by the plurality of differential planet wheels 31, and the small planet wheels are at least partially positioned in the corresponding gaps. When the number of the tower-type double-tooth planet wheels 22 is equal to that of the differential planet wheels 31, that is, the number of the small planet wheels is equal to that of the differential planet wheels 222, the small planet wheels 222 and the differential planet wheels 31 are alternately arranged at equal intervals.

Referring to fig. 5, in an embodiment of the present invention, the compound planet carrier 4 includes a planet carrier housing 41, and the planet carrier housing 41 is provided with a first planet carrier supporting position 42, a large planet wheel supporting position 44, a small planet wheel supporting position 43, a sun wheel supporting position 45, and a differential planet wheel supporting position 46.

Referring to fig. 1, 3 and 5, the compound planet carrier 4 is coaxially arranged with the NW planetary gear train 2, the differential gear train 3 and the driving motor 5, and is supported on the housing support system 6 in a relatively rotating manner, preferably by a rolling bearing, and substantially coincides with the NW planetary gear train 2 and the differential gear train 3 in the axial dimension, and comprises a planet carrier housing 41, a planet carrier support location 42, a tower planetary gear support location 43, a tower planetary gear support location 44, a sun gear support location 45 and a differential planetary gear support location 46, all of which are preferably supported by a rolling bearing. The planet carrier shell 41 provides integration of all support positions, the planet carrier support position 42 and the sun wheel support position 45 are coaxial with the NW planetary gear train 2, the differential gear train 3 and the driving motor 5 are arranged, the planet carrier support position 42 is connected with the shell support system 6 in a rolling bearing mode, the sun wheel support position 45 is connected with the sun wheel 21 in a rolling bearing mode, the tower type planetary wheel support position 43 and the tower type planetary wheel support position 44 are equal in number and coaxial with the tower type double-tooth planetary wheel 22 and are supported on two sides of the tower type double-tooth planetary wheel 22, the differential planetary wheel support position 46 is equal in number to the differential planetary wheel 31, and support is provided for the differential planetary wheel 31.

Referring to fig. 1 and 6, the driving motor 5 is disposed coaxially with the NW planetary gear train 2, the differential gear train 3 and the compound planet carrier 4, and includes a motor stator 51 and a motor rotor 52, the motor stator 51 is disposed on the housing support system 6 in a coaxial fixed manner, preferably in an interference connection, through a motor stator support location 65, and the motor rotor 52 is disposed on the housing support system 6 in a relative rotation manner, preferably in a rolling bearing connection, through a motor rotor support location 62 and a motor rotor support location 63.

Referring to fig. 6, in an embodiment of the present invention, the housing supporting frame 6 includes: the device comprises a shell, wherein a second planet carrier supporting position 61, a first motor rotor supporting position 62, a second motor rotor supporting position 63, an inner gear ring supporting position 64 and a motor stator supporting position 65 are arranged on the shell. The housing may consist of 2 to 4 sub-housings, preferably 3 parts.

Comparing fig. 1 and fig. 2, it can be seen that compared with the existing driving device, because of adopting the NW planetary gear train 2, the differential gear train 3 and the compound planet carrier 4 share the axial dimension, the differential gear train 3 is arranged in the rotation central cavity of the NW planetary gear train 2 and is simultaneously arranged on the compound planet carrier 4, and the compound planet carrier 4 is arranged on the shell supporting system 6, which not only meets the supporting requirements of the tower type double-tooth planet gear 22 and the differential planet gear 31 for revolving around the axis of the coaxial driving device 1 and rotating around the axis thereof, but also can realize smaller axial dimension, and is beneficial to realizing higher power density and power assembly arrangement convenient for the whole vehicle.

Compared with the fig. 1 and 4, as the tower type double-tooth planet wheels 22 and the differential planet wheels 31 are equal in number, preferably 3, uniform and equal-interval arrangement in the circumferential direction can be realized, the amount of dynamic unbalance of a rotating part in a driving device is greatly reduced, dynamic unbalance force can be generated during rotation due to known dynamic unbalance, and additional fatigue and failure are caused to related parts, so that the durability and reliability of the parts on a power transmission path are improved, and meanwhile, due to known knowledge, vibration generated by the dynamic unbalance force can generate an NVH problem, so that the NVH attribute is improved.

Because the tower-type double-tooth planet wheels 22 and the differential planet wheels 31 are equal in number and are arranged alternately, the tower-type double-tooth planet wheels 22 can avoid a shell at the supporting position 46 of the differential planet wheels, and further realize smaller radial size.

A vehicle is provided with the coaxial driving device.

According to the coaxial driving device, the differential gear train 3 is positioned in the rotation central cavity of the NW planet row gear train 2, the differential gear train 3 is embedded into the planet row to realize smaller axial size, and the smaller axial size is beneficial to the arrangement of a driving half shaft of the whole vehicle and the arrangement of a front wheel steering engine. Meanwhile, the outer diameter of the running track of the differential gear train 3 is larger than the inner diameter of the running track of the NW planetary gear train 2, so that the radial size of the whole device is reduced, a smaller radial size can bring a higher ground clearance, a free Z-direction arrangement space is provided, and the motor controller is more convenient to integrate. Therefore, the invention effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A coaxial drive, comprising:

a housing support frame;

the driving motor is arranged on the shell supporting frame;

the composite planet carrier is rotatably arranged on the shell support frame;

the NW planetary gear train is arranged on the compound planet carrier, a rotation center inner cavity is arranged in the NW planetary gear train, and the NW planetary gear train is connected with the driving motor;

the differential gear train is arranged on the composite planet carrier and positioned in the rotary central cavity, and the outer diameter of the running track of the differential gear train is larger than the inner diameter of the running track of the NW planetary gear train;

wherein the driving motor, the compound planet carrier, the NW planet row gear train and the differential gear train are coaxially arranged.

2. The coaxial drive of claim 1, wherein the differential gear train comprises: differential planet wheel and side gear, differential planet wheel rotate install in on the compound planet carrier, differential planet wheel with side gear meshes.

3. The coaxial drive of claim 2, wherein the NW planetary gear train comprises: the sun gear is connected with an output shaft of the driving motor, the tower type duplex gear planet gear is meshed with the sun gear, and the inner gear ring is meshed with the tower type duplex gear planet gear.

4. The coaxial drive of claim 3, wherein the ring gear is mounted on the housing support bracket and the compound planet carrier is located inside the ring gear.

5. The coaxial drive of claim 3, wherein the differential gear train comprises a number of differential planets, the NW planetary gear train comprises a number of tower-type double-tooth planets, and the number of tower-type double-tooth planets corresponds to the number of differential planets.

6. The coaxial drive of claim 5, wherein the number of tower-type double-tooth planet wheels is equal to the number of differential planet wheels.

7. The coaxial drive arrangement of claim 6, wherein each of the tower-type dual-tooth planet gears comprises a large planet gear and a small planet gear, the large planet gear is coaxially connected with the small planet gear, the large planet gear is meshed with the sun gear, the small planet gear is meshed with the inner gear ring, and the small planet gears and the differential planet gears are alternately arranged at equal intervals.

8. The coaxial drive arrangement according to claim 1, characterized in that the compound planet carrier comprises a planet carrier housing on which a first planet carrier support location, a large planet wheel support location, a small planet wheel support location, a sun wheel support location and a differential planet wheel support location are provided.

9. The coaxial drive of claim 1, wherein the housing support bracket comprises: the motor comprises a shell, wherein a second planet carrier supporting position, a first motor rotor supporting position, a second motor rotor supporting position, an inner gear ring supporting position and a motor stator supporting position are arranged on the shell.

10. A vehicle, characterized in that the vehicle is provided with a coaxial drive according to any one of claims 1-9.