CN217994141U

CN217994141U - Reduction gear, electric drive assembly and vehicle

Info

Publication number: CN217994141U
Application number: CN202222154900.4U
Authority: CN
Inventors: 白云辉; 王坤城; 穆金辉; 朱海波; 冯煜阳
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-09
Anticipated expiration: 2032-08-16

Abstract

The utility model relates to a reduction gear, electric drive assembly and vehicle, this reduction gear include first planet row, second planet row, first semi-axis, second semi-axis and differential locking means, the input of first planet row is connected first motor, the output of first planet row is connected the first semi-axis, the input of second planet row is connected the second motor, the output of second planet row is connected the second semi-axis; the first planetary row has a two speed ratio and the second planetary row has a two speed ratio; the differential locking device is connected between the first axle shaft and the second axle shaft for selectively engaging or disengaging the first axle shaft and the second axle shaft. The utility model discloses a reduction gear has that two keep off the velocity ratio and can select, has solved the single problem of current two motor driving system velocity ratios.

Description

Reduction gear, electric drive assembly and vehicle

Technical Field

The utility model belongs to the technical field of vehicle drive, a reduction gear, electric drive assembly and vehicle are related to.

Background

The prior art discloses a double-motor power system, which comprises a first motor, a second motor and a left-right planetary gear reducer, wherein the left-side planetary gear reducer is connected between a left half shaft and the first motor, the right-side planetary gear reducer is connected between a right half shaft and the second motor, and double motors can simultaneously work to drive wheels on the left side and the right side together and can also independently work to independently drive wheels on the corresponding sides. The dual-motor power system can be suitable for pure electric vehicle types and hybrid vehicle types, and realizes the two-wheel drive or four-wheel drive function.

However, the existing dual-motor power system has single speed ratio and less working modes. When the dual-motor power system is used for driving a pure electric vehicle, the motor efficiency is not fully exerted during low-speed and high-speed operation. In addition, when one motor is damaged, the other motor cannot operate alone to undertake the normal running task of the vehicle in the conventional dual-motor power system. The two motors operate for a long time, which is not beneficial to the reduction of the temperature of the motors and can not realize the alternate operation of the two motors.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: aiming at the problem that the speed ratio of the existing dual-motor power system is single, a speed reducer, an electric drive assembly and a vehicle are provided.

In order to solve the above technical problem, in one aspect, the present invention provides a speed reducer, including a first planetary row, a second planetary row, a first half shaft, a second half shaft and a differential locking device, wherein an input end of the first planetary row is connected to a first motor, an output end of the first planetary row is connected to the first half shaft, an input end of the second planetary row is connected to a second motor, and an output end of the second planetary row is connected to the second half shaft; the first planetary row has a two speed ratio and the second planetary row has a two speed ratio;

the differential locking device is connected between the first and second axle shafts for selectively engaging or disengaging the first and second axle shafts.

The utility model discloses first motor is connected to the input of reduction gear, first planet row, and first semi-axis is connected to the output of first planet row, and the second motor is connected to the input of second planet row, and the second semi-axis is connected to the output of second planet row. Because the first planetary row has two-gear speed ratio, the second planetary row has two-gear speed ratio for this reduction gear has two-gear speed ratio and can select, has solved the single problem of current two motor power system speed ratio. The design of the two-gear speed ratio of the speed reducer can realize that the first motor and the second motor work in a high-efficiency rotating speed area, and the efficiency of the motor can be fully exerted when the speed reducer runs at low speed and high speed.

In addition, the differential locking device can realize the engagement and the disengagement of the first half shaft and the second half shaft, and realize the differential locking function of the left and the right wheels.

On the other hand, the embodiment of the utility model provides an still provide an electric drive system, including first motor, second motor and foretell reduction gear.

The utility model discloses an electric drive assembly, through the selective joint or the disconnection to first joint disconnect-ing device, second joint disconnect-ing device, third joint disconnect-ing device and fourth joint disconnect-ing device, multiple mode can be realized, can selectively get into single motor and keep off the mode, single motor keeps off the mode, two motor keep off the mode, single motor is stranded one and keeps off the mode, two motor are stranded one and keep off the mode, two motor are stranded two and keep off the mode and braking energy recovery mode, this electric drive assembly operating mode is efficient, operating mode is various, the perfect compromise of dynamic nature and economic nature has been realized.

In still another aspect, embodiments of the present invention further provide a vehicle, which includes the above-mentioned electric drive assembly.

Drawings

Fig. 1 is a schematic view of an electric drive assembly provided in accordance with a first embodiment of the present invention;

fig. 2 is a schematic view of an electric drive assembly provided by a second embodiment of the present invention;

fig. 3 is a schematic view of an electric drive assembly provided by a third embodiment of the present invention;

fig. 4 is a schematic view of an electric drive assembly provided by a fourth embodiment of the present invention;

fig. 5 is a schematic view of an electric drive assembly provided in a fifth embodiment of the present invention.

The reference numerals in the specification are as follows:

1. a first motor; 11. a motor shaft of the first motor; 2. a second motor; 21. a motor shaft of the second motor; 3. a first half shaft; 4. a second half shaft; 5. a differential lock; 6. a differential device; 61. a differential housing; 62. a planetary bevel gear; 63. a planet bevel gear shaft; 64. a first half-axis bevel gear; 65. a second half shaft bevel gear; 71. a first engagement disconnection device; 72. a second engagement disconnection device; 73. a third engagement disconnection device; 74. a fourth engagement disconnection device;

10. a first planetary gear reduction mechanism; 101. a first sun gear; 102. a first planet gear; 103. a first carrier; 104. a first ring gear; 20. a second planetary gear reduction mechanism; 201. a second sun gear; 202. a second planet wheel; 2021. a second large planet wheel; 2022. a second small planet wheel; 203. a second planet carrier; 204. a second ring gear; 30. a third planetary gear reduction mechanism; 301. a third sun gear; 302. a third planet gear; 303. a third carrier; 304. a third ring gear; 40. a fourth planetary gear reduction mechanism; 401. a fourth sun gear; 402. a fourth planet gear; 4021. a fourth large planet wheel; 4022. a fourth small planet wheel; 403. a fourth planet carrier; 404. and a fourth ring gear.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The embodiment of the utility model provides a speed reducer, including first planet row, second planet row, first semi-axis, second semi-axis and differential locking means, the input of first planet row is connected first motor, the output of first planet row is connected the first semi-axis, the input of second planet row is connected the second motor, the output of second planet row is connected the second semi-axis; the first planetary row has a two speed ratio and the second planetary row has a two speed ratio; the differential locking device is connected between the first axle shaft and the second axle shaft for selectively engaging or disengaging the first axle shaft and the second axle shaft. The differential locking device may be directly connected between the first half shaft and the second half shaft, or the differential locking device may be connected between the first half shaft and the second half shaft through a differential device, or the differential locking device may be connected between the output end of the first planetary row and the output end of the second planetary row.

Herein, the speed ratio of the first planetary row refers to a ratio of an input rotation speed to an output rotation speed of the first planetary row, i.e., a reduction ratio. Similarly, the speed ratio of the second planetary row refers to the ratio of the input speed to the output speed of the second planetary row, namely the speed reduction ratio. The reduction ratio is a value greater than 1.

In some embodiments, the first planetary row includes a first planetary gear reduction mechanism and a second planetary gear reduction mechanism that are coaxially disposed; the speed reducer also comprises a first joint disconnecting device and a second joint disconnecting device; the first planetary gear reduction mechanism includes a first input element, a first output element, and a first intermediate element, and the second planetary gear reduction mechanism includes a second input element, a second output element, and a second intermediate element; the first input element is connected with a motor shaft of a first motor, the first output element is connected with the second input element, the second output element is connected with the first half shaft, and the second intermediate element is connected with a static part; the first input element is an input end of the first planet row, and the second output element is an output end of the first planet row; the first engagement and disengagement device is connected between the first intermediate element and the stationary component and is used for selectively engaging or disengaging the first intermediate element and the stationary component; the second joint disconnecting device is connected between the first output element and the motor shaft of the first motor and used for selectively jointing or disconnecting the first output element and the motor shaft of the first motor; when the second engaging and disengaging device is disconnected, the first planetary row is in a 1-gear speed ratio; when the second engagement disconnecting device is engaged, the first planetary row is in a 2-gear speed ratio, and the 2-gear speed ratio of the first planetary row is smaller than the 1-gear speed ratio of the first planetary row.

In some embodiments, the second planetary row includes a third planetary gear reduction mechanism and a fourth planetary gear reduction mechanism that are coaxially arranged; the speed reducer further comprises a third joint disconnecting device and a fourth joint disconnecting device; the third planetary gear reduction mechanism including a third input element, a third output element, and a third intermediate element, the fourth planetary gear reduction mechanism including a fourth input element, a fourth output element, and a fourth intermediate element; the third input element is connected with a motor shaft of a second motor, the third output element is connected with the fourth input element, the fourth output element is connected with the second half shaft, and the fourth intermediate element is connected with a static part; the third input element is an input end of the second planet row, and the fourth output element is an output end of the second planet row; the third engagement and disengagement means is connected between the third intermediate element and the stationary part for selectively engaging or disengaging the third intermediate element and the stationary part; the fourth joint disconnecting device is connected between the fourth output element and the motor shaft of the second motor and used for selectively jointing or disconnecting the fourth output element and the motor shaft of the second motor; when the fourth engaging and disconnecting device is disconnected, the second planetary row is in a 1-gear speed ratio; when the fourth engagement disconnection device is engaged, the second planetary row is in a 2-gear speed ratio, and the 2-gear speed ratio of the second planetary row is smaller than the 1-gear speed ratio of the first planetary row.

The first planetary row has a speed ratio of 2 that is less than the speed ratio of 1 of the first planetary row, which indicates that speed 1 of the first planetary row has a greater reduction than speed 2. The second planetary row has a speed ratio of 2 that is less than the speed ratio of 1 of the second planetary row, which indicates that 1 of the second planetary row has a greater reduction than 2. In the case where the output rotation speeds of the motors are uniform, the 1 st gear has a higher output torque, and the 2 nd gear has a larger output rotation speed.

In some embodiments, the second planetary row has a speed ratio of 1 st gear equal to the speed ratio of 1 st gear of the second planetary row, and the second planetary row has a speed ratio of 2 nd gear equal to the speed ratio of 2 nd gear of the second planetary row.

In other embodiments, the speed ratio of the second planetary row in 1 gear may not be equal to the speed ratio of the second planetary row in 1 gear, and the speed ratio of the second planetary row in 2 gear may not be equal to the speed ratio of the second planetary row in 2 gear.

In some embodiments, the differential locking device is connected between the fourth output member and the second axle shaft.

In other embodiments, the differential lock is connected between the second output member and the first axle shaft.

In other embodiments, the differential locking device is connected between the second output member and the second axle shaft.

In other embodiments, the differential lock is connected between the fourth output member and the first axle shaft.

In other embodiments, the differential locking device is connected between the second output member and the fourth output member.

In some embodiments, the first planetary gear reduction mechanism is a planetary gear set including a first sun gear, a first planetary gear, a first carrier, and a first ring gear, the first input element is a first sun gear, the first output element is a first ring gear, the first intermediate element is a first carrier, the first planetary gear is rotatably supported by the first carrier, and the first planetary gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary gear, a second planet carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second gear ring, the second intermediate element is a second planet carrier, the second planetary gear is rotatably supported on the second planet carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first ring gear is coaxially connected with the second sun gear, the second planet carrier is connected with a static component, and the first joint disconnection device is connected between the first planet carrier and the static component and used for selectively jointing or disconnecting the first planet carrier and the static component; the second joint disconnection device is connected between the first gear ring and the motor shaft of the first motor and used for selectively jointing or disconnecting the first gear ring and the motor shaft of the first motor; the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third gear ring, the third intermediate element is a third planet carrier, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is a fourth sun gear, the fourth output element is a fourth gear ring, the fourth intermediate element is a fourth planet carrier, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third ring gear is coaxially connected with a fourth sun gear, the fourth planet carrier is connected to a stationary member, and the third engagement disconnection device is connected between the third planet carrier and the stationary member for selectively engaging or disengaging the third planet carrier and the stationary member; the fourth engagement and disengagement means is connected between the third ring gear and the motor shaft of the second motor for selectively engaging or disengaging the third ring gear with the motor shaft of the second motor.

In some embodiments, the first planetary gear reduction mechanism is a planetary gear set composed of a first sun gear, a first planetary gear, a first carrier, and a first ring gear, the first input element is a first sun gear, the first output element is a first carrier, the first intermediate element is a first ring gear, the first planetary gear is rotatably supported on the first carrier, and the first planetary gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second gear ring, the second intermediate element is a second planetary carrier, the second planetary gear is rotatably supported on the second planetary carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first planet carrier is coaxially connected with a second sun gear, the second planet carrier is connected with a static component, and the first joint disconnection device is connected between the first ring gear and the static component and used for selectively jointing or disconnecting the first ring gear and the static component; the second joint disconnection device is connected between the first planet carrier and the motor shaft of the first motor and used for selectively jointing or disconnecting the first planet carrier and the motor shaft of the first motor; the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third planet carrier, the third intermediate element is a third gear ring, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is a fourth sun gear, the fourth output element is a fourth gear ring, the fourth intermediate element is a fourth planet carrier, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third planet carrier is coaxially connected with a fourth sun gear, the fourth planet carrier is connected to a static component, and the third joint disconnecting device is connected between the third gear ring and the static component and used for selectively jointing or disconnecting the third gear ring and the static component; the fourth joint disconnection device is connected between the third planet carrier and the motor shaft of the second motor and used for selectively jointing or disconnecting the third planet carrier and the motor shaft of the second motor.

In some embodiments, the first planetary gear reduction mechanism is a planetary gear set including a first sun gear, a first planet gear, a first carrier, and a first ring gear, the first input element is a first sun gear, the first output element is a first carrier, the first intermediate element is a first ring gear, the first planet gear is rotatably supported on the first carrier, and the first planet gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second planetary carrier, the second intermediate element is a second gear ring, the second planetary gear is rotatably supported on the second planetary carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first planet carrier is coaxially connected with a second sun gear, the second ring gear is connected to a stationary member, and the first engagement and disengagement means is connected between the first ring gear and the stationary member for selectively engaging or disengaging the first ring gear with the stationary member; the second joint disconnection device is connected between the first planet carrier and the motor shaft of the first motor and used for selectively jointing or disconnecting the first planet carrier and the motor shaft of the first motor; the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third planet carrier, the third intermediate element is a third gear ring, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is the fourth sun gear, the fourth output element is the fourth planet carrier, the fourth intermediate element is the fourth gear ring, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third planet carrier is coaxially connected with a fourth sun gear, the fourth ring gear is connected to a stationary member, and the third engagement disconnection device is connected between the third ring gear and the stationary member for selectively engaging or disengaging the third ring gear with the stationary member; the fourth joint disconnecting device is connected between the third planet carrier and the motor shaft of the second motor and used for selectively jointing or disconnecting the third planet carrier and the motor shaft of the second motor.

In some embodiments, the first planetary gear reduction mechanism is a planetary gear set including a first sun gear, a first planetary gear, a first carrier, and a first ring gear, the first input element is a first sun gear, the first output element is a first ring gear, the first intermediate element is a carrier, the first planetary gear is rotatably supported on the first carrier, and the first planetary gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second planetary carrier, the second intermediate element is a second gear ring, the second planetary gear is rotatably supported on the second planetary carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first gear ring is coaxially connected with the second sun gear, the second gear ring is connected with a static component, and the first engagement and disengagement device is connected between the first planet carrier and the static component and used for selectively engaging or disengaging the first planet carrier and the static component; the second joint disconnection device is connected between the first gear ring and the motor shaft of the first motor and used for selectively jointing or disconnecting the first gear ring and the motor shaft of the first motor; the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third gear ring, the third intermediate element is a planet carrier, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is the fourth sun gear, the fourth output element is the fourth planet carrier, the fourth intermediate element is the fourth gear ring, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third ring gear is coaxially connected with a fourth sun gear, the fourth ring gear is connected to a stationary member, and the third engagement disconnection device is connected between the third planet carrier and the stationary member for selectively engaging or disengaging the third planet carrier and the stationary member; the fourth engagement and disengagement means is connected between the third ring gear and the motor shaft of the second motor for selectively engaging or disengaging the third ring gear with the motor shaft of the second motor.

In other embodiments, the second planet gears comprise a second large planet gear and a second small planet gear, the second large planet gear is in mesh with a second sun gear, and the second small planet gear is in mesh with the second ring gear, wherein the second large planet gear is coaxially connected with the second small planet gear; the fourth planet wheel comprises a fourth large planet wheel and a fourth small planet wheel, the fourth large planet wheel is coaxially connected with the fourth large planet wheel, the diameter of the fourth small planet wheel is smaller than that of the fourth large planet wheel, the fourth large planet wheel is meshed with the fourth sun gear, and the fourth small planet wheel is meshed with the fourth gear ring.

In other embodiments, the second planet gear is a single gear and the fourth planet gear is a single gear.

In some embodiments, the speed reducer further comprises a differential device, an input of the differential device being connected between the output of the first planetary row and the output of the second planetary row, a first output of the differential device being connected with the first half-shaft, a second output of the differential device being connected with the second half-shaft; said differential locking means being connected between said input of said differential means and said second axle shaft for selectively engaging or disengaging said input of said differential means with said second axle shaft to selectively engage or disengage said first axle shaft with said second axle shaft; alternatively, the differential locking device is connected between the input end of the differential device and the first axle shaft for selectively engaging or disengaging the input end of the differential device with the first axle shaft to selectively engage or disengage the first axle shaft with the first axle shaft.

In some embodiments, the first planetary row, the second planetary row, the first axle shaft, the second axle shaft, and the differential device are coaxially arranged.

In some embodiments, the differential device comprises a differential case and a bevel planet gear, a bevel planet gear shaft, a bevel first axle gear and a bevel second axle gear disposed within the differential case, the differential case being an input of the differential device, the bevel planet gear shaft being fixed within the differential case and perpendicular to the first axle shaft, the bevel planet gear being rotatably connected to the bevel planet gear shaft, the bevel first axle gear being connected to an inner end of the first axle shaft, an outer end of the first axle shaft being connected to a first wheel, the bevel second axle gear being connected to an inner end of the second axle shaft, an outer end of the second axle shaft being connected to a second wheel, the bevel first axle gear being a first output of the differential device, the bevel second axle gear being a second output of the differential device; the first half bevel gear is in orthogonal meshing with the planetary bevel gear, and the second half bevel gear is in orthogonal meshing with the planetary bevel gear.

In some embodiments, the differential locking device is connected between the differential case and the second axle shaft for selectively engaging or disengaging the differential case with the second axle shaft to selectively engage or disengage the first axle shaft with the second axle shaft.

In other embodiments, the differential locking device is connected between the differential case and the first axle shaft for selectively engaging or disengaging the differential case with the first axle shaft to selectively engage or disengage the first axle shaft with the second axle shaft.

In some embodiments, the differential locking device is integrated within the differential housing.

In some embodiments, the differential case, the output of the first planetary row and the output of the second planetary row are integrated.

In some embodiments, the differential case, the second output element, and the fourth output element are integrated.

In some embodiments, the differential case, the second ring gear, and the fourth ring gear are integrated.

In some embodiments, the differential case, the second planet carrier, and the fourth planet carrier are integrated.

The embodiment of the utility model provides an electric drive system is still provided, including first motor, second motor and foretell reduction gear.

The utility model discloses an electric drive assembly, through to first joint disconnect device, second joint disconnect device, third joint disconnect device, the selective joint or the disconnection of fourth joint disconnect device and differential locking device, multiple mode can be realized, can selectively get into single motor and keep off the mode, single motor keeps off the mode, double-motor keeps off the mode, single motor is stranded one and keeps off the mode, single motor is stranded two and keeps off the mode, double-motor is stranded one and keeps off the mode, double-motor is stranded two and keeps off mode and braking energy recovery mode, this electric drive assembly operating mode is efficient, operating mode is various, the perfect compromise of dynamic property and economic nature has been realized.

The present invention will be described in detail with reference to the accompanying drawings and various embodiments.

First embodiment

Referring to fig. 1, the first embodiment of the present invention provides an electric drive assembly including a first electric machine 1, a second electric machine 2, and a speed reducer. The speed reducer comprises a first planet row, a second planet row, a first half shaft 3, a second half shaft 4 and a differential locking device 5, wherein the input end of the first planet row is connected with a first motor 1, the output end of the first planet row is connected with the first half shaft 3, the input end of the second planet row is connected with a second motor 2, and the output end of the second planet row is connected with the second half shaft 4; the first planetary row has a two speed ratio and the second planetary row has a two speed ratio; the differential locking device 5 is connected between the first axle shaft 3 and the second axle shaft 4 for selectively engaging or disengaging the first axle shaft 3 and the second axle shaft 4.

In the present embodiment, the differential lock device 5 is connected between the first axle shaft 3 and the second axle shaft 4 through a differential device 6, hereinafter.

The differential locking device 5 may be a clutch, a brake or a synchronizer. In the present embodiment, a clutch is preferable.

The utility model discloses the reduction gear of first embodiment because first planet row has two fender speed ratios, and second planet row has two fender speed ratios for this reduction gear has two fender speed ratios and can select, has solved the single problem of current two motor power system speed ratios. The design of the two-gear speed ratio of the speed reducer can realize that the first motor 1 and the second motor 2 work in a high-efficiency rotating speed area, and the efficiency of the motors can be fully exerted when the motors run at low speed and high speed.

The first planetary gear train includes a first planetary gear reduction mechanism 10 and a second planetary gear reduction mechanism 20 which are coaxially arranged; the reducer further comprises a first engagement and disengagement device 71 and a second engagement and disengagement device 72; the first planetary gear reduction mechanism 10 includes a first input element, a first output element, and a first intermediate element, and the second planetary gear reduction mechanism 20 includes a second input element, a second output element, and a second intermediate element; the first input element is connected with a motor shaft 11 of a first motor 1, the first output element is connected with the second input element, the second output element is connected with the first half shaft 3, and the second intermediate element is connected with a static part; the first input element is an input end of the first planet row, and the second output element is an output end of the first planet row; the first engagement and disengagement means 71 is connected between the first intermediate element and the stationary part for selectively engaging or disengaging the first intermediate element and the stationary part; the second engagement and disengagement device 72 is connected between the first output element and the motor shaft 11 of the first motor 1, and is used for selectively engaging or disengaging the first output element and the motor shaft 11 of the first motor 1; with the second engagement disconnection device 72 engaged, the first planetary row is in a 1 speed ratio; when the second disconnecting switch 72 is disconnected, the first planetary row is in the 2 speed ratio, and the 2 speed ratio of the first planetary row is smaller than the 1 speed ratio of the first planetary row.

The second planetary row comprises a third planetary gear speed reducing mechanism 30 and a fourth planetary gear speed reducing mechanism 40 which are coaxially arranged; the reducer further comprises a third engagement and disengagement device 73 and a fourth engagement and disengagement device 74; the third planetary gear reduction mechanism 30 includes a third input element, a third output element, and a third intermediate element, and the fourth planetary gear reduction mechanism 40 includes a fourth input element, a fourth output element, and a fourth intermediate element; the third input element is connected to the motor shaft 21 of the second motor 2, the third output element is connected to the fourth input element, the fourth output element is connected to the second half shaft 4, and the fourth intermediate element is connected to a stationary part; the third input element is an input of the second planetary row and the fourth output element is an output of the second planetary row; the third engagement and disengagement means 73 is connected between the third intermediate element and the stationary part for selectively engaging or disengaging the third intermediate element and the stationary part; the fourth engagement and disengagement means 74 is connected between the fourth output element and the motor shaft 21 of the second motor 2 for selectively engaging or disengaging the fourth output element with the motor shaft 21 of the second motor 2; with the fourth engagement disconnection device 74 engaged, the second planetary row is in the 1 st gear ratio; when the fourth off-going engagement device 74 is disengaged, the second planetary row is in the 2 speed ratio, and the 2 speed ratio of the second planetary row is smaller than the 1 speed ratio of the first planetary row.

The speed ratio of the second planetary row in the 1 gear is equal to the speed ratio of the second planetary row in the 1 gear, and the speed ratio of the second planetary row in the 2 gear is equal to the speed ratio of the second planetary row in the 2 gear; the differential locking device 5 is connected between the fourth output member and the second axle shaft 4.

The motor shaft 11 of the first motor 1 is a hollow shaft, and the first half shaft 3 passes through the motor shaft 11 of the first motor 1. The motor shaft 21 of the second motor 2 is a hollow shaft, and the second half shaft 4 passes through the motor shaft 21 of the second motor 2. Therefore, the speed reducer is compact in structure and small in occupied space.

The stationary member may be, for example, a housing of the first electric machine 1, a housing of the second electric machine 2, a transmission housing, or the like, which is stationary with respect to the vehicle body.

Specifically, the first planetary gear reduction mechanism 10 is a planetary gear set including a first sun gear 101, a first planetary gear 102, a first carrier 103, and a first ring gear 104, the first input element is the first sun gear 101, the first output element is the first ring gear 104, the first intermediate element is the first carrier 103, the first planetary gear 102 is rotatably supported by the first carrier 103, and the first planetary gear 102 is engaged between the first sun gear 101 and the first ring gear 104; the second planetary gear speed reduction mechanism 20 is a planetary row composed of a second sun gear 201, a second planet gear 202, a second planet carrier 203 and a second ring gear 204, the second input element is the second sun gear 201, the second output element is the second ring gear 204, the second intermediate element is the second planet carrier 203, the second planet gear 202 is rotatably supported on the second planet carrier 203, and the second planet gear 202 is engaged between the second sun gear 201 and the second ring gear 204; the first ring gear 104 is coaxially connected with the second sun gear 201, the second carrier 203 is connected to a stationary member, and the first engagement and disengagement means 71 is connected between the first carrier 103 and the stationary member for selectively engaging or disengaging the first carrier 103 with the stationary member; the second engagement and disengagement means 72 is connected between the first ring gear 104 and the motor shaft 11 of the first motor 1 for selectively engaging or disengaging the first ring gear 104 with the motor shaft 11 of the first motor 1; the third planetary gear reduction mechanism 30 is a planetary gear set including a third sun gear 301, a third planetary gear 302, a third carrier 303, and a third ring gear 304, the third input element is the third sun gear 301, the third output element is the third ring gear 304, the third intermediate element is the third carrier 303, the third planetary gear 302 is rotatably supported by the third carrier 303, and the third planetary gear 302 is engaged between the third sun gear 301 and the third ring gear 304; the fourth planetary gear reduction mechanism 40 is a planetary row composed of a fourth sun gear 401, a fourth planet gear 402, a fourth planet carrier 403 and a fourth ring gear 404, the fourth input element is the fourth sun gear 401, the fourth output element is the fourth ring gear 404, the fourth intermediate element is the fourth planet carrier 403, the fourth planet gear 402 is rotatably supported on the fourth planet carrier 403, and the fourth planet gear 402 is engaged between the fourth sun gear 401 and the fourth ring gear 404; the third ring gear 304 is coaxially connected with a fourth sun gear 401, the fourth planet carrier 403 is connected to a stationary member, and the third engagement disconnection device 73 is connected between the third planet carrier 303 and the stationary member for selectively engaging or disconnecting the third planet carrier 303 with the stationary member; the fourth engagement and disengagement means 74 is connected between the third ring gear 304 and the motor shaft 21 of the second motor 2 for selectively engaging or disengaging the third ring gear 304 with the motor shaft 21 of the second motor 2.

The first, second, third and fourth engagement and

disengagement devices

71, 72, 73 and 74 may be clutches, brakes or synchronizers. In the present embodiment, a clutch is preferable.

More preferably, the second planet wheel 202 comprises a second big planet wheel 2021 and a second small planet wheel 2022, the diameter of which is smaller than that of the second big planet wheel 2021, the second big planet wheel 2021 is meshed with the second sun wheel 201, and the second small planet wheel 2022 is meshed with the second gear ring 204; the fourth planetary gear 402 comprises a fourth big planetary gear 4021 and a fourth small planetary gear 4022 which is smaller in diameter than the fourth big planetary gear 4021, the fourth big planetary gear 4021 is engaged with the fourth sun gear 401, and the fourth small planetary gear 4022 is engaged with the fourth ring gear 404.

When the first engagement and disengagement device 71 is disengaged and the second engagement and disengagement device 72 is engaged, the first planetary gear speed reduction mechanism 10 is rotated as a whole (the speed ratio is 1), and the first planetary gear set is in the 2-speed ratio (i.e., the 2-speed ratio of the first planetary gear set is the speed ratio of the second planetary gear speed reduction mechanism 20). The two-stage reduction of the first planetary row is achieved by the double planetary gear structure of the second planetary gear reduction mechanism 20. When the first engagement and disengagement device 71 is engaged and the second engagement and disengagement device 72 is disengaged, the first planetary gear set is in the 1 st gear ratio (i.e., the 1 st gear ratio of the first planetary gear set is the product of the speed ratios of the first planetary gear reduction mechanism 10 and the second planetary gear reduction mechanism 20). The three-stage reduction of the first planetary row is realized by the single planetary gear structure of the first planetary gear reduction mechanism 10 and the double planetary gear structure of the second planetary gear reduction mechanism 20. When the third disconnecting device 73 is disconnected and the fourth disconnecting device 74 is connected, the third planetary gear speed reduction mechanism 30 is rotated integrally (the speed ratio is 1), and the second planetary gear set is in the 2-speed ratio (i.e., the 2-speed ratio of the second planetary gear set is the speed ratio of the fourth planetary gear speed reduction mechanism 40). The two-stage reduction of the second planetary row is achieved by the double planetary gear structure of the fourth planetary gear reduction mechanism 40. When the third disconnecting and coupling device 73 is connected and the fourth disconnecting and coupling device 74 is disconnected, the second planetary gear set is in the 1 st speed ratio (i.e., the 1 st speed ratio of the second planetary gear set is the product of the speed ratios of the third planetary gear reduction mechanism 30 and the fourth planetary gear reduction mechanism 40). The three-stage reduction of the second planetary gear set is realized by the single planetary gear structure of the third planetary gear reduction mechanism 30 and the double planetary gear structure of the fourth planetary gear reduction mechanism 40.

The two-gear speed ratio design of the first planetary row and the second planetary row can realize the speed ratio design in a larger range, so that the two motors can work in a high-efficiency rotating speed area.

The speed reducer further comprises a differential device 6, an input end of the differential device 6 is connected between an output end of the first planetary row and an output end of the second planetary row, a first output end of the differential device 6 is connected with the first half shaft 3, and a second output end of the differential device 6 is connected with the second half shaft 4; the differential locking device 5 is connected between an input of the differential device 5 and the second axle shaft 4 for selectively engaging or disengaging the input of the differential device 6 with the second axle shaft 4 to selectively engage or disengage the first axle shaft 3 with the second axle shaft 4.

The first planetary row, the second planetary row, the first half shaft 3, the second half shaft 4 and the differential device 6 are coaxially arranged.

Specifically, the differential device 6 includes a differential case 61, and a bevel pinion 62, a bevel pinion shaft 63, a first bevel pinion 64 and a second bevel pinion 65 which are arranged in the differential case 61, wherein the differential case 61 is an input end of the differential device 6, the bevel pinion shaft 63 is fixed in the differential case 61 and is perpendicular to the first half shaft 3, the bevel pinion 62 is rotatably connected to the bevel pinion shaft 63, the first bevel pinion 64 is connected to an inner end of the first half shaft 3, an outer end of the first half shaft 3 is connected to a first wheel, the second bevel pinion 65 is connected to an inner end of the second half shaft 4, an outer end of the second half shaft 4 is connected to a second wheel, the first bevel pinion 64 is a first output end of the differential device 6, and the second bevel pinion 65 is a second output end of the differential device 6; the first half bevel gear 64 is in orthogonal mesh with the bevel pinion gears 62, and the second half bevel gear 65 is in orthogonal mesh with the bevel pinion gears 62; the differential locking device 5 is connected between the differential case 51 and the second axle shaft 4 for selectively engaging or disengaging the differential case 61 and the second axle shaft 4 to selectively engage or disengage the first axle shaft 3 and the second axle shaft 4. The first wheel is a left side wheel and the second wheel is a right side wheel.

Preferably, the differential locking device 5 is integrated into the differential housing 61. Thus, the internal space of the differential case 61 can be fully utilized, the space occupation of the differential lock device 5 can be reduced, and the integration level of the assembly can be improved.

The differential case 51, the output end of the first planetary row and the output end of the second planetary row are integrated into a whole. In this embodiment, the differential case 51, the second ring gear 204, and the fourth ring gear 404 are integrated. The electric drive assembly has the advantages of ingenious design and compact structure, can realize the coaxial arrangement of the power input and output of the electric drive assembly, the two half shafts and the wheels, saves the space of the whole vehicle and improves the integration level of the assembly.

In addition, through the integrated design of the differential locking device 5 and the differential device 6, the output of the torque and the equal rotating speed of the first half shaft 3 and the second half shaft 4 under special working conditions can be realized, the escape of the vehicle is realized, and the off-road capability of the vehicle carrying the electric drive assembly is strong.

In addition, the temperature of the first motor 3 and the temperature of the second motor 4 are detected through the sensors, so that the function that the two motors work independently in turn when certain monitoring conditions are met is realized, and the two motors work alternately. The problems of temperature rise, service life reduction and the like caused by long-time continuous operation of the motor in the industry are solved. When one motor is damaged, the other motor can be operated independently to undertake the normal running task of the vehicle, and the safety is high.

The utility model discloses an electric drive assembly can be used to forerunner's vehicle, rear drive vehicle and four-wheel drive vehicle.

The utility model discloses an electric drive assembly, through to first joint disconnect device 71, second joint disconnect device 72, third joint disconnect device 73, the selective joint or the disconnection of fourth joint disconnect device 74 and differential locking device 5, multiple mode can be realized, can selectively get into single motor one and keep off the mode, single motor two keep off the mode, two motor one keep off the mode, two motor two keep off the mode, single motor one that gets rid of poverty keeps off the mode, two motor one that gets rid of poverty keep off the mode, two motor two that get rid of poverty keep off the mode and braking energy recovery mode, this electric drive assembly operating mode is efficient, the operating mode is various, the perfect compromise of dynamic property and economic nature has been realized.

The implementation of each mode is described in detail below.

(1) Single motor one-gear mode

The third engagement and disengagement device 73 is engaged, the first engagement and disengagement device 71, the second engagement and disengagement device 72, the fourth engagement and disengagement device 74 and the differential locking device 5 are disengaged, the first motor 1 does not work, the second motor 2 works, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 and the fourth planetary gear reduction mechanism 40, and then is transmitted to the first wheel and the second wheel through the first half shaft 3 and the second half shaft 4 respectively, and the single-motor first-gear mode in which the second motor 2 is driven independently is realized.

The first engagement/disengagement device 71 is engaged, the second engagement/disengagement device 72, the third engagement/disengagement device 73, the fourth engagement/disengagement device 74, and the differential lock device 5 are disengaged, the first electric motor 1 is operated, the second electric motor 2 is not operated, the power of the first electric motor 1 is transmitted to the differential case 61 of the differential device 6 via the first planetary gear reduction mechanism 10 and the second planetary gear reduction mechanism 20, and then is transmitted to the first wheel and the second wheel via the first half shaft 3 and the second half shaft 4, respectively, so that the single-motor first-gear mode in which the first electric motor 1 is driven alone is realized.

(2) Two keep mode of single motor

The fourth engagement and disengagement device 74 is engaged, the first engagement and disengagement device 71, the second engagement and disengagement device 72, the third engagement and disengagement device 73 and the differential locking device 5 are disengaged, the first motor 1 does not work, the second motor 2 works, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 (integral rotation) and the fourth planetary gear reduction mechanism 40, and then is transmitted to the first wheel and the second wheel through the first half shaft 3 and the second half shaft 4 respectively, and the single-motor two-gear mode in which the second motor 2 is driven independently is realized.

The second engagement/disengagement device 72 is engaged, the first engagement/disengagement device 71, the third engagement/disengagement device 73, the fourth engagement/disengagement device 74, and the differential lock device 5 are disengaged, the first electric motor 1 is operated, the second electric motor 2 is not operated, and the power of the first electric motor 1 is transmitted to the differential case 61 of the differential device 6 via the first planetary gear reduction mechanism 10 (integral rotation) and the second planetary gear reduction mechanism 20, and then transmitted to the first wheel and the second wheel via the first half shaft 3 and the second half shaft 4, respectively, thereby realizing the single-motor two-gear mode in which the first electric motor 1 is driven alone.

(3) Dual motor one-gear mode

The first engagement and disengagement device 71 and the third engagement and disengagement device 73 are engaged, the second engagement and disengagement device 72, the fourth engagement and disengagement device 74 and the differential locking device 5 are disengaged, the first motor 1 is operated, the second motor 2 is operated, the power of the first motor 1 is transmitted to the differential case 61 of the differential device 6 through the first planetary gear reduction mechanism 10 and the second planetary gear reduction mechanism 20, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 and the fourth planetary gear reduction mechanism 40, and then is transmitted to the first wheel and the second wheel through the first half shaft 3 and the second half shaft 4 respectively, so that the two-motor first-gear mode is realized.

(4) Two-motor two-gear mode

The second engagement and disengagement device 72, the fourth engagement and disengagement device 74 and the first engagement and disengagement device 71, the third engagement and disengagement device 73 and the differential locking device 5 are disengaged, the first motor 1 operates, the second motor 2 operates, the power of the first motor 1 is transmitted to the differential case 61 of the differential device 6 through the first planetary gear reduction mechanism 10 (integral rotation) and the second planetary gear reduction mechanism 20, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 (integral rotation) and the fourth planetary gear reduction mechanism 40, and then is transmitted to the first wheel and the second wheel through the first half shaft 3 and the second half shaft 4, respectively, so that the two-motor two-gear mode is realized.

(5) Single-motor escaping one-gear mode

The third engagement and disengagement device 73 and the differential locking device 5 are engaged, the first engagement and disengagement device 71, the second engagement and disengagement device 72 and the fourth engagement and disengagement device 74 are disengaged, the first motor 1 does not work, the second motor 2 works, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 and the fourth planetary gear reduction mechanism 40, and then the differential device 6 is integrally rotated through the engagement of the differential locking device 5 to transmit the power to the first wheel and the second wheel from the first half shaft 3 and the second half shaft 4 respectively, so that the single-motor first gear mode in which the second motor 2 is driven independently is realized.

The first engagement/disengagement device 71 and the differential lock device 5 are engaged, the second engagement/disengagement device 72, the third engagement/disengagement device 73, and the fourth engagement/disengagement device 74 are disengaged, the first electric motor 1 is operated, the second electric motor 2 is not operated, the power of the first electric motor 1 is transmitted to the differential case 61 of the differential device 6 through the first planetary gear reduction mechanism 10 and the second planetary gear reduction mechanism 20, and the differential device 6 is rotated as a whole to transmit the power to the first wheel and the second wheel from the first half shaft 3 and the second half shaft 4 through the engagement of the differential lock device 5, so that the single-motor first gear mode in which the first electric motor 1 is driven alone is realized.

(6) Single-motor escaping two-gear mode

(7) Dual-motor first-gear mode for getting rid of trouble

The first engagement and disengagement device 71, the third engagement and disengagement device 73 and the differential locking device 5 are engaged, the second engagement and disengagement device 72 and the fourth engagement and disengagement device 74 are disengaged, the first motor 1 is operated, the second motor 2 is operated, the power of the first motor 1 is transmitted to the differential case 61 of the differential device 6 through the first planetary gear reduction mechanism 10 and the second planetary gear reduction mechanism 20, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 and the fourth planetary gear reduction mechanism 40, and the differential locking device 5 is engaged, so that the differential device 6 rotates integrally to transmit the power to the first wheel and the second wheel from the first half shaft 3 and the second half shaft 4 respectively, and the double-motor first gear mode is realized.

(8) Two-gear mode for dual-motor escaping

The second engagement and disengagement device 72, the fourth engagement and disengagement device 74, and the differential lock device 5 are engaged, the first engagement and disengagement device 71 and the third engagement and disengagement device 73 are disengaged, the first motor 1 is operated, the second motor 2 is operated, the power of the first motor 1 is transmitted to the differential case 61 of the differential device 6 through the first planetary gear reduction mechanism 10 (integral rotation) and the second planetary gear reduction mechanism 20, the power of the second motor 2 is transmitted to the differential case 61 of the differential device 6 through the third planetary gear reduction mechanism 30 (integral rotation) and the fourth planetary gear reduction mechanism 40, and the differential lock device 5 is engaged, so that the differential device 6 is integrally rotated to transmit the power to the first wheel and the second wheel from the first half shaft 3 and the second half shaft 4, respectively, and the two-motor double-trapped-gear mode is realized.

(9) Braking energy recovery mode

The second engagement and disengagement device 72 is engaged, the first engagement and disengagement device 71, the third engagement and disengagement device 73, the fourth engagement and disengagement device 74 and the differential locking device 5 are disengaged, the braking energy of the first wheel is transmitted to the differential case 61 through the first half shaft 3, the braking energy of the second wheel is transmitted to the differential case 61 through the second half shaft 4, the differential case 61 transmits the energy to the second motor 2 through the fourth planetary gear reduction mechanism 40 and the third planetary gear reduction mechanism 30 (integral rotation) to drive the second motor 2 to generate electricity, and the braking energy recovery mode of the second motor 2 to generate electricity is realized.

In addition, the fourth engagement and disengagement device 74 is engaged, the first engagement and disengagement device 71, the second engagement and disengagement device 72, the third engagement and disengagement device 73 and the differential locking device 5 are disengaged, the braking energy of the first wheel is transmitted to the differential case 61 through the first half shaft 3, the braking energy of the second wheel is transmitted to the differential case 61 through the second half shaft 4, and the differential case 61 transmits the energy to the first electric motor 1 through the second planetary gear reduction mechanism 20 and the first planetary gear reduction mechanism 10 (integral rotation) to drive the second electric motor 1 to generate electricity, so that the braking energy recovery mode of the first electric motor 1 to generate electricity is realized.

In addition, the second engagement and disengagement device 72 and the fourth engagement and disengagement device 74 are engaged, the first engagement and disengagement device 71, the third engagement and disengagement device 73 and the differential locking device 5 are disengaged, the braking energy of the first wheel is transmitted to the differential case 61 through the first half shaft 3, the braking energy of the second wheel is transmitted to the differential case 61 through the second half shaft 4, the differential case 61 transmits a part of the energy to the first motor 1 through the second planetary gear reduction mechanism 20 and the first planetary gear reduction mechanism 10 (integral rotation) to drive the second motor 1 to generate electricity, and the differential case 61 transmits the other part of the energy to the second motor 2 through the fourth planetary gear reduction mechanism 40 and the third planetary gear reduction mechanism 30 (integral rotation) to drive the second motor 2 to generate electricity, so that the double-motor electricity generation braking energy recovery mode is realized.

Second embodiment

Fig. 2 shows an electric drive assembly according to a second embodiment of the present invention, which is mainly different from the first embodiment in that the first planetary gear reduction mechanism 10 is a planetary row composed of a first sun gear 101, a first planet gear 102, a first planet carrier 103 and a first ring gear 104, the first input element is the first sun gear 101, the first output element is the first planet carrier 103, the first intermediate element is the first ring gear 104, the first planet gear 102 is rotatably supported on the first planet carrier 103, and the first planet gear 102 is engaged between the first sun gear 101 and the first ring gear 104; the second planetary gear reduction mechanism 20 is a planetary row composed of a second sun gear 201, a second planet gear 202, a second planet carrier 203 and a second gear ring 204, the second input element is the second sun gear 201, the second output element is the second gear ring 204, the second intermediate element is the second planet carrier 203, the second planet gear 202 is rotatably supported on the second planet carrier 203, and the second planet gear 202 is meshed between the second sun gear 201 and the second gear ring 204; the first carrier 103 is coaxially connected with a second sun gear 201, the second carrier 203 is connected to a stationary member, and the first engagement disconnection means 71 is connected between the first ring gear 104 and the stationary member for selectively engaging or disengaging the first ring gear 104 with the stationary member; the second engagement and disengagement means 72 is connected between the first carrier 103 and the motor shaft 11 of the first motor 1 for selectively engaging or disengaging the first carrier 103 and the motor shaft 11 of the first motor 1.

The third planetary gear reduction mechanism 30 is a planetary gear set including a third sun gear 301, a third planetary gear 302, a third carrier 303, and a third ring gear 304, the third input element is the third sun gear 301, the third output element is the third carrier 303, the third intermediate element is the third ring gear 304, the third planetary gear 302 is rotatably supported by the third carrier 303, and the third planetary gear 302 is engaged between the third sun gear 301 and the third ring gear 304; the fourth planetary gear reduction mechanism 40 is a planetary row composed of a fourth sun gear 401, a fourth planet gear 402, a fourth planet carrier 403 and a fourth ring gear 404, the fourth input element is the fourth sun gear 401, the fourth output element is the fourth ring gear 404, the fourth intermediate element is the fourth planet carrier 403, the fourth planet gear 402 is rotatably supported on the fourth planet carrier 403, and the fourth planet gear 402 is engaged between the fourth sun gear 401 and the fourth ring gear 404; the third planet carrier 303 is coaxially connected with a fourth sun gear 401, the fourth planet carrier 403 is connected to a stationary member, and the third engagement disconnection device 73 is connected between the third ring gear 304 and the stationary member for selectively engaging or disconnecting the third ring gear 304 with the stationary member; the fourth engagement and disengagement device 74 is connected between the third planet carrier 303 and the motor shaft 21 of the second motor 2, and is used for selectively engaging or disengaging the third planet carrier 303 and the motor shaft 21 of the second motor 2.

Third embodiment

Fig. 3 shows an electric drive assembly according to a third embodiment of the present invention, which is mainly different from the first embodiment in that the first planetary gear reduction mechanism 10 is a planetary row composed of a first sun gear 10, a first planet gear 102, a first planet carrier 103 and a first ring gear 104, the first input element is a first sun gear 101, the first output element is a first planet carrier 103, the first intermediate element is a first ring gear 104, the first planet gear 102 is rotatably supported on the first planet carrier 103, and the first planet gear 102 is engaged between the first sun gear 101 and the first ring gear 104; the second planetary gear speed reducing mechanism 20 is a planetary row composed of a second sun gear 201, a second planet gear 202, a second planet carrier 203 and a second ring gear 204, the second input element is the second sun gear 201, the second output element is the second planet carrier 203, the second intermediate element is the second ring gear 204, the second planet gear 202 is rotatably supported on the second planet carrier 203, and the second planet gear 202 is engaged between the second sun gear 201 and the second ring gear 204; the first carrier 103 is coaxially connected with the second sun gear 201, the second ring gear 204 is connected to a stationary member, and the first engagement disconnection device 71 is connected between the first ring gear 104 and the stationary member for selectively engaging or disengaging the first ring gear 104 with the stationary member; the second engagement and disengagement means 72 is connected between the first carrier 103 and the motor shaft 11 of the first motor 1 for selectively engaging or disengaging the first carrier 103 and the motor shaft 11 of the first motor 1.

The third planetary gear reduction mechanism 30 is a planetary gear set including a third sun gear 301, a third planetary gear 302, a third carrier 303, and a third ring gear 304, the third input element is the third sun gear 301, the third output element is the third carrier 303, the third intermediate element is the third ring gear 304, the third planetary gear 302 is rotatably supported by the third carrier 303, and the third planetary gear 302 is engaged between the third sun gear 301 and the third ring gear 304; the fourth planetary gear reduction mechanism 40 is a planetary row composed of a fourth sun gear 401, a fourth planetary gear 402, a fourth carrier 403 and a fourth ring gear 404, the fourth input element is the fourth sun gear 401, the fourth output element is the fourth carrier 403, the fourth intermediate element is the fourth ring gear 404, the fourth planetary gear 402 is rotatably supported on the fourth carrier 403, and the fourth planetary gear 402 is engaged between the fourth sun gear 401 and the fourth ring gear 404; the third planet carrier 303 is coaxially connected with a fourth sun gear 401, the fourth ring gear 404 is connected to a stationary member, and the third engagement disconnection means 73 is connected between the third ring gear 304 and the stationary member for selectively engaging or disengaging the third ring gear 304 with the stationary member; the fourth engagement and disengagement means 74 is connected between the third planet carrier 303 and the motor shaft 21 of the second motor 2, and is used for selectively engaging or disengaging the third planet carrier 303 and the motor shaft 21 of the second motor 2.

Fourth embodiment

Fig. 4 shows an electric drive assembly according to a fourth embodiment of the present invention, which is different from the first embodiment in that the first planetary gear reduction mechanism 10 is a planetary gear set including a first sun gear 101, a first planet gear 102, a first carrier 103, and a first ring gear 104, the first input element is the first sun gear 101, the first output element is the first ring gear 104, the first intermediate element is the carrier 103, the first planet gear 102 is rotatably supported by the first carrier 103, and the first planet gear 102 is engaged between the first sun gear 101 and the first ring gear 104; the second planetary gear speed reducing mechanism 20 is a planetary row composed of a second sun gear 201, a second planet gear 202, a second planet carrier 203 and a second ring gear 204, the second input element is the second sun gear 201, the second output element is the second planet carrier 203, the second intermediate element is the second ring gear 204, the second planet gear 202 is rotatably supported on the second planet carrier 203, and the second planet gear 202 is engaged between the second sun gear 201 and the second ring gear 204; the first ring gear 104 is coaxially connected with the second sun gear 201, the second ring gear 204 is connected to a stationary member, and the first engagement and disengagement device 71 is connected between the first carrier 103 and the stationary member for selectively engaging or disengaging the first carrier 103 with the stationary member; the second engagement and disengagement means is connected between the first ring gear 104 and the motor shaft 11 of the first motor 1 for selectively engaging or disengaging the first ring gear 104 with the motor shaft 11 of the first motor 1.

The third planetary gear reduction mechanism 30 is a planetary row composed of a third sun gear 301, a third planetary gear 302, a third planet carrier 303 and a third ring gear 304, the third input element is the third sun gear 301, the third output element is the third ring gear 304, the third intermediate element is the planet carrier 303, the third planetary gear 302 is rotatably supported on the third planet carrier 303, and the third planetary gear 302 is engaged between the third sun gear 301 and the third ring gear 304; the fourth planetary gear reduction mechanism 40 is a planetary gear set composed of a fourth sun gear 401, a fourth planet gear 402, a fourth planet carrier 403 and a fourth ring gear 404, the fourth input element is the fourth sun gear 401, the fourth output element is the fourth planet carrier 403, the fourth intermediate element is the fourth ring gear 404, the fourth planet gear 402 is rotatably supported on the fourth planet carrier 403, and the fourth planet gear 402 is engaged between the fourth sun gear 401 and the fourth ring gear 404; the third ring gear 304 is coaxially connected with the fourth sun gear 401, the fourth ring gear 404 is connected to a stationary member, and the third engagement disconnection means 43 is connected between the third carrier 303 and the stationary member for selectively engaging or disengaging the third carrier 303 with the stationary member; the fourth engagement and disengagement means 74 is connected between the third ring gear 304 and the motor shaft 21 of the second motor 2 for selectively engaging or disengaging the third ring gear 304 with the motor shaft 21 of the second motor 2.

Fifth embodiment

Fig. 5 shows an electric drive assembly according to a fifth embodiment of the present invention, which is different from the first embodiment in that a differential device 6 is eliminated, and the differential lock device 5 is connected between the output end of the first planetary row and the output end of the second planetary row. Specifically, the differential lock device 5 is connected between the second ring gear 204 and the fourth ring gear 404.

The electric drive assembly of the fifth embodiment eliminates the differential device 6 and is generally free from difficulties. The method can be suitable for two-wheel drive vehicles or four-wheel drive vehicles with lower cost.

An embodiment of the utility model provides a vehicle, including foretell electric drive assembly. The vehicle may be front drive, rear drive or four drive.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A speed reducer is characterized by comprising a first planet row, a second planet row, a first half shaft, a second half shaft and a differential locking device, wherein the input end of the first planet row is connected with a first motor, the output end of the first planet row is connected with the first half shaft, the input end of the second planet row is connected with a second motor, and the output end of the second planet row is connected with the second half shaft; the first planetary row has a two speed ratio and the second planetary row has a two speed ratio;

the differential locking device is connected between the first axle shaft and the second axle shaft for selectively engaging or disengaging the first axle shaft and the second axle shaft.

2. The reducer according to claim 1, wherein said first planetary row includes a first planetary gear reduction mechanism and a second planetary gear reduction mechanism that are coaxially arranged; the speed reducer also comprises a first joint disconnecting device and a second joint disconnecting device;

the first planetary gear reduction mechanism includes a first input element, a first output element, and a first intermediate element, and the second planetary gear reduction mechanism includes a second input element, a second output element, and a second intermediate element; the first input element is connected with a motor shaft of a first motor, the first output element is connected with the second input element, the second output element is connected with the first half shaft, and the second intermediate element is connected with a static part; the first input element is an input end of the first planet row, and the second output element is an output end of the first planet row;

the first engagement and disengagement device is connected between the first intermediate element and the stationary component and is used for selectively engaging or disengaging the first intermediate element and the stationary component;

the second joint disconnecting device is connected between the first output element and the motor shaft of the first motor and used for selectively jointing or disconnecting the first output element and the motor shaft of the first motor; when the second engagement disconnection device is disconnected, the first planetary row is in a 1-gear speed ratio; when the second engaging and disengaging device is engaged, the first planetary row is in a 2-gear speed ratio, and the 2-gear speed ratio of the first planetary row is smaller than the 1-gear speed ratio of the first planetary row.

3. A reducer according to claim 2, in which the second planetary row comprises a third planetary gear reduction mechanism and a fourth planetary gear reduction mechanism arranged coaxially; the speed reducer also comprises a third joint disconnection device and a fourth joint disconnection device;

the third planetary gear reduction mechanism including a third input element, a third output element, and a third intermediate element, the fourth planetary gear reduction mechanism including a fourth input element, a fourth output element, and a fourth intermediate element; the third input element is connected with a motor shaft of a second motor, the third output element is connected with the fourth input element, the fourth output element is connected with the second half shaft, and the fourth intermediate element is connected with a static part; the third input element is an input end of the second planet row, and the fourth output element is an output end of the second planet row;

the third engagement and disengagement means is connected between the third intermediate element and the stationary part for selectively engaging or disengaging the third intermediate element and the stationary part;

the fourth joint disconnecting device is connected between the fourth output element and the motor shaft of the second motor and used for selectively jointing or disconnecting the fourth output element and the motor shaft of the second motor; when the fourth engaging and disconnecting device is disconnected, the second planetary row is in a 1-gear speed ratio; when the fourth engagement disconnection device is engaged, the second planetary row is in a 2-gear speed ratio, and the 2-gear speed ratio of the second planetary row is smaller than the 1-gear speed ratio of the first planetary row.

4. The speed reducer of claim 3, wherein the second planetary row has a 1 speed ratio equal to the second planetary row's 1 speed ratio and a 2 speed ratio equal to the second planetary row's 2 speed ratio.

5. A retarder according to claim 3, wherein the differential locking means is connected between the fourth output member and a second half shaft; alternatively, the differential lock device is connected between the second output element and the first half shaft; alternatively, the differential locking device is connected between the second output member and a second axle shaft; alternatively, the differential lock device is connected between the fourth output element and the first half shaft; alternatively, the differential lock device is connected between the second output element and the fourth output element.

6. A reducer according to claim 3, in which the first planetary reduction mechanism is a planetary row consisting of a first sun gear, a first planet gear, a first carrier and a first ring gear, the first input element is the first sun gear, the first output element is the first ring gear, the first intermediate element is the first carrier, the first planet gear is rotatably supported on the first carrier, and the first planet gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary gear, a second planet carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second gear ring, the second intermediate element is a second planet carrier, the second planetary gear is rotatably supported on the second planet carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first ring gear is coaxially connected with a second sun gear, the second carrier is connected to a stationary member, and the first engagement and disengagement means is connected between the first carrier and the stationary member for selectively engaging or disengaging the first carrier and the stationary member; the second joint disconnection device is connected between the first gear ring and the motor shaft of the first motor and used for selectively jointing or disconnecting the first gear ring and the motor shaft of the first motor;

the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third gear ring, the third intermediate element is a third planet carrier, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is a fourth sun gear, the fourth output element is a fourth gear ring, the fourth intermediate element is a fourth planet carrier, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third ring gear is coaxially connected with a fourth sun gear, the fourth planet carrier is connected to a stationary member, and the third engagement and disengagement means is connected between the third planet carrier and the stationary member for selectively engaging or disengaging the third planet carrier and the stationary member; the fourth engagement and disengagement means is connected between the third ring gear and the motor shaft of the second motor for selectively engaging or disengaging the third ring gear with the motor shaft of the second motor.

7. A reducer according to claim 3, in which the first planetary reduction mechanism is a planetary row consisting of a first sun gear, a first planet gear, a first carrier and a first ring gear, the first input element is the first sun gear, the first output element is the first carrier, the first intermediate element is the first ring gear, the first planet gear is rotatably supported on the first carrier, and the first planet gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary gear, a second planet carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second gear ring, the second intermediate element is a second planet carrier, the second planetary gear is rotatably supported on the second planet carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first planet carrier is coaxially connected with a second sun gear, the second planet carrier is connected with a static component, and the first joint disconnection device is connected between the first ring gear and the static component and used for selectively jointing or disconnecting the first ring gear and the static component; the second joint disconnection device is connected between the first planet carrier and the motor shaft of the first motor and used for selectively jointing or disconnecting the first planet carrier and the motor shaft of the first motor;

the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third planet carrier, the third intermediate element is a third gear ring, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is a fourth sun gear, the fourth output element is a fourth gear ring, the fourth intermediate element is a fourth planet carrier, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third planet carrier is coaxially connected with a fourth sun gear, the fourth planet carrier is connected to a static component, and the third joint disconnecting device is connected between the third gear ring and the static component and used for selectively jointing or disconnecting the third gear ring and the static component; the fourth joint disconnection device is connected between the third planet carrier and the motor shaft of the second motor and used for selectively jointing or disconnecting the third planet carrier and the motor shaft of the second motor.

8. A reducer according to claim 3, in which the first planetary reduction mechanism is a planetary row consisting of a first sun gear, a first planet gear, a first carrier and a first ring gear, the first input element is the first sun gear, the first output element is the first carrier, the first intermediate element is the first ring gear, the first planet gear is rotatably supported on the first carrier, and the first planet gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second planetary carrier, the second intermediate element is a second gear ring, the second planetary gear is rotatably supported on the second planetary carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first planet carrier is coaxially connected with a second sun gear, the second ring gear is connected to a stationary member, and the first engagement and disengagement means is connected between the first ring gear and the stationary member for selectively engaging or disengaging the first ring gear with the stationary member; the second joint disconnection device is connected between the first planet carrier and the motor shaft of the first motor and used for selectively jointing or disconnecting the first planet carrier and the motor shaft of the first motor;

the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third planet carrier, the third intermediate element is a third gear ring, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is a fourth sun gear, the fourth output element is a fourth planet carrier, the fourth intermediate element is a fourth gear ring, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third planet carrier is coaxially connected with a fourth sun gear, the fourth ring gear is connected to a stationary member, and the third engagement disconnection device is connected between the third ring gear and the stationary member for selectively engaging or disengaging the third ring gear with the stationary member; the fourth joint disconnecting device is connected between the third planet carrier and the motor shaft of the second motor and used for selectively jointing or disconnecting the third planet carrier and the motor shaft of the second motor.

9. A reducer according to claim 3, in which the first planetary reduction mechanism is a planetary row consisting of a first sun gear, a first planet gear, a first carrier and a first ring gear, the first input element is the first sun gear, the first output element is the first ring gear, the first intermediate element is a carrier, the first planet gear is rotatably supported on the first carrier, and the first planet gear is engaged between the first sun gear and the first ring gear; the second planetary gear reduction mechanism is a planetary row composed of a second sun gear, a second planetary carrier and a second gear ring, the second input element is a second sun gear, the second output element is a second planetary carrier, the second intermediate element is a second gear ring, the second planetary gear is rotatably supported on the second planetary carrier, and the second planetary gear is meshed between the second sun gear and the second gear ring; the first gear ring is coaxially connected with the second sun gear, the second gear ring is connected with a static component, and the first engagement and disengagement device is connected between the first planet carrier and the static component and used for selectively engaging or disengaging the first planet carrier and the static component; the second joint disconnecting device is connected between the first gear ring and the motor shaft of the first motor and used for selectively jointing or disconnecting the first gear ring and the motor shaft of the first motor;

the third planetary gear speed reducing mechanism is a planet row composed of a third sun gear, a third planetary gear, a third planet carrier and a third gear ring, the third input element is a third sun gear, the third output element is a third gear ring, the third intermediate element is a planet carrier, the third planetary gear is rotatably supported on the third planet carrier, and the third planetary gear is meshed between the third sun gear and the third gear ring; the fourth planetary gear speed reducing mechanism is a planet row composed of a fourth sun gear, a fourth planet carrier and a fourth gear ring, the fourth input element is the fourth sun gear, the fourth output element is the fourth planet carrier, the fourth intermediate element is the fourth gear ring, the fourth planet gear is rotatably supported on the fourth planet carrier, and the fourth planet gear is meshed between the fourth sun gear and the fourth gear ring; the third ring gear is coaxially connected with a fourth sun gear, the fourth ring gear is connected to a stationary member, and the third engagement and disengagement means is connected between the third carrier and the stationary member for selectively engaging or disengaging the third carrier and the stationary member; the fourth engagement and disengagement means is connected between the third ring gear and the motor shaft of the second motor for selectively engaging or disengaging the third ring gear with the motor shaft of the second motor.

10. The reducer according to any one of claims 6-9, wherein the second planet gears include a second large planet gear and a second small planet gear that is smaller in diameter than the second large planet gear, the second large planet gear is meshed with a second sun gear, and the second small planet gear is meshed with the second ring gear;

the fourth planet wheel comprises a fourth large planet wheel and a fourth small planet wheel, the fourth large planet wheel is coaxially connected with the fourth large planet wheel, the diameter of the fourth small planet wheel is smaller than that of the fourth large planet wheel, the fourth large planet wheel is meshed with the fourth sun gear, and the fourth small planet wheel is meshed with the fourth gear ring.

11. A reducer according to any one of claims 2 to 9, further comprising a differential device, an input of the differential device being connected between the outputs of the first and second planetary rows, a first output of the differential device being connected to the first half-shaft and a second output of the differential device being connected to the second half-shaft;

said differential locking means being connected between said input of said differential means and said second axle shaft for selectively engaging or disengaging said input of said differential means with said second axle shaft to selectively engage or disengage said first axle shaft with said second axle shaft; alternatively, the differential locking device is connected between the input of the differential device and the first axle for selectively engaging or disengaging the input of the differential device with the first axle to selectively engage or disengage the first axle shaft with the second axle shaft.

12. A reducer according to claim 11, in which the first planetary row, the second planetary row, the first half-shaft, the second half-shaft and the differential are arranged coaxially.

13. The speed reducer of claim 11, wherein the differential device comprises a differential case and, disposed within the differential case, a bevel planet gear shaft, a bevel first axle gear and a bevel second axle gear, the differential case being an input of the differential device, the bevel planet gear shaft being fixed within the differential case and perpendicular to the first axle shaft, the bevel planet gear being rotatably connected to the bevel planet gear shaft, the bevel first axle gear being connected to an inner end of the first axle shaft, an outer end of the first axle shaft being connected to a first wheel, the bevel second axle gear being connected to an inner end of the second axle shaft, an outer end of the second axle shaft being connected to a second wheel, the bevel first axle gear being a first output of the differential device, the bevel second axle gear being a second output of the differential device; the first half shaft bevel gear is in orthogonal meshing with the planetary bevel gear, and the second half shaft bevel gear is in orthogonal meshing with the planetary bevel gear;

said differential locking device being connected between said differential case and a second axle shaft for selectively engaging or disengaging said differential case with said second axle shaft to selectively engage or disengage said first axle shaft with said second axle shaft; alternatively, the differential locking device is connected between the differential case and the first axle shaft for selectively engaging or disengaging the differential case with the first axle shaft to selectively engage or disengage the first axle shaft with the first axle shaft.

14. A retarder according to claim 13, wherein the differential locking means is integrated in the differential housing.

15. A decelerator according to claim 13 wherein the differential housing, the output of the first planet row and the output of the second planet row are integral.

16. An electric drive assembly comprising a first electric machine, a second electric machine and a speed reducer according to any one of claims 1 to 15.

17. A vehicle comprising the electric drive assembly of claim 16.