Dual-motor power system and vehicle

Abstract

The utility model relates to a dual-motor power system and a vehicle, the dual-motor power system comprises a first motor, a second motor, a first planet row structure and a second planet row structure which are arranged on a vehicle body, and the first motor and the second motor are arranged in parallel along the length direction of the vehicle body; the first motor is in transmission connection with a first output shaft through a first planet row structure, and the second motor is in transmission connection with a second output shaft through a second planet row structure; the first output shaft and the second output shaft are located on the two sides of a vehicle body correspondingly, and the first output shaft and the second output shaft are coaxially arranged. The electric drive assembly structure aims at solving the problem that an existing electric drive assembly structure is low in transmission efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile accessories and equipment, and specifically relates to a dual-motor power system and a vehicle. Background Art

[0002] New energy vehicles have become widely popular, and dual-motor powered vehicles have excellent performance in efficiency and power, and have become a new direction for the development of the automotive industry.

[0003] Chinese patent CN115534646A discloses an electric drive assembly, a four-wheel drive system and a car, wherein the electric drive assembly adopts a parallel arrangement of motors, realizes power transmission through a shaft-tooth meshing structure, changes the distance requirement in the horizontal direction to the vertical direction, and balances the space requirements in the two directions. However, due to the limitation of the gear meshing structure, the maximum primary speed ratio can only be 3-4, and the transmission efficiency is low. Utility Model Content

[0004] The purpose of the utility model is to provide a dual-motor power system and a vehicle to solve the problem of low transmission efficiency of the existing electric drive assembly structure.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the utility model is as follows:

[0006] A dual-motor drive system, comprising:

[0007] A first motor, a second motor, a first planetary gear structure and a second planetary gear structure are installed on the vehicle body, the first motor and the second motor are arranged in parallel along the length direction of the vehicle body, the first motor is connected to the first output shaft through the first planetary gear structure, and the second motor is connected to the second output shaft through the second planetary gear structure; the first output shaft and the second output shaft are respectively located on both sides of the vehicle body, and the first output shaft and the second output shaft are coaxially arranged.

[0008] Preferably, the first planetary gear structure and the second planetary gear are both single planetary gears. This arrangement makes the power output to the first output shaft and the second output shaft the same, which is conducive to uniform power transmission of the vehicle, and the single planetary gear reduces installation requirements.

[0009] Preferably, the single planetary gear comprises a sun gear, a planetary gear, a ring gear and a planet carrier, the output shaft of the first motor is drivingly connected to the first input shaft, the sun gear is fixedly connected to the first input shaft, the planetary gear is meshed with the sun gear, the ring gear is fixedly mounted on the vehicle body, and the planetary gear is meshed with the ring gear;

[0010] The planetary gear is rotatably mounted on the planetary carrier, the planetary carrier is fixedly connected to a transmission shaft, the transmission shaft is fixedly connected to a transmission gear, the first output shaft is fixedly connected to an output gear, and the transmission gear meshes with the output gear. In this way, the single planetary gearbox has low installation requirements and is more suitable for vehicles with small body sizes. At the same time, the single planetary gearbox can set the speed ratio to 8, improve the transmission efficiency, and has a simple structure and strong practicality.

[0011] Preferably, the first planetary gear structure and the second planetary gear are both two-stage planetary gears. This arrangement makes the power output to the first output shaft and the second output shaft the same, which is conducive to uniform power transmission of the vehicle. By setting up a two-stage planetary gear, the power transmission efficiency is improved.

[0012] Preferably, the secondary planetary gear comprises a sun gear, a planetary gear, a ring gear and a planet carrier, the output shaft of the first motor is drivingly connected to the first input shaft, the sun gear is fixed to the first input shaft, the planetary gear is meshed with the sun gear, and the planetary gear is rotatably mounted on the planet carrier;

[0013] The gear ring is fixedly mounted on the vehicle body, a secondary planetary gear is arranged on the planet carrier, the secondary planetary gear and the planetary gear form a double gear, the secondary planetary gear is meshed with the gear ring, the planet carrier is fixedly connected with a transmission shaft, a transmission gear is fixedly connected to the transmission shaft, an output gear is fixedly connected to the first output shaft, and the transmission gear is meshed with the output gear. In this way, the speed ratio can be set to 14 through the secondary planetary gear, the transmission efficiency is improved, the structure is simple, and the practicability is strong.

[0014] Preferably, the first motor and the second motor are staggered in the width direction of the vehicle body, which is conducive to fitting the first motor and the second motor into a space with limited vehicle body size, thereby reducing the size requirement in the width direction of the vehicle body.

[0015] Preferably, it further comprises a plurality of supporting bearings arranged on the vehicle body, wherein in the first planetary gear structure and the second planetary gear structure, the first input shaft is rotatably mounted on the vehicle body through a supporting bearing, the transmission shaft is rotatably mounted on the vehicle body through a supporting bearing, and the first output shaft is rotatably mounted on the vehicle body through two supporting bearings. This arrangement reduces the number of installed bearings and reduces costs.

[0016] A vehicle comprises the above-mentioned dual-motor drive system, wherein the dual-motor drive system is arranged on the vehicle body.

[0017] The utility model adopting the above technical solution has the following advantages:

[0018] 1. In this solution, the first motor and the first output shaft are driven by the first planetary gear, and the second motor and the second output shaft are driven by the second planetary gear. Due to the use of the first planetary gear and the second planetary gear structure, the output speed ratio is larger, and the transmission efficiency is improved. At the same time, the first planetary gear and the second planetary gear structure have low space requirements during installation, which is convenient for installation in various vehicle models.

[0019] 2. In this solution, the first motor and the second motor are staggered in the width direction of the vehicle body, which is conducive to converging the first motor and the second motor within a space with limited vehicle body size, thereby reducing the size requirements in the width direction of the vehicle body;

[0020] 3. In this solution, by using the first planetary gear transmission between the first motor and the first output shaft and the second planetary gear transmission between the second motor and the second output shaft, the number of supporting bearings is reduced and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention can be further described by the non-limiting embodiments given in the accompanying drawings;

[0022] Figure 1 This is a structural schematic diagram of an embodiment of a dual-motor drive system of the utility model;

[0023] Figure 2 This is a schematic structural diagram of a dual-motor drive system embodiment of the utility model in which the first planetary gear is a single planetary gear;

[0024] Figure 3 This is a schematic structural diagram of a dual-motor drive system embodiment of the utility model in which the first planetary gear is a two-stage planetary gear;

[0025] Figure 4 This is a schematic diagram of power transmission of a dual-motor drive system embodiment of the utility model in which the first planetary gear is a single planetary gear;

[0026] The main component symbols are described as follows:

[0027] 1. first motor; 11. first output shaft; 111. output gear; 12. first input shaft;

[0028] 2. second motor; 21. second output shaft;

[0029] 31. sun gear; 32. planetary gear; 33. ring gear; 34. planet carrier; 341. secondary planetary gear; 35. transmission shaft; 351. transmission gear;

[0030] 4. Support bearing. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or in the specification, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "back", etc., are only referenced to the directions of the drawings and are not used to limit the scope of protection of the present invention.

[0032] like Figure 1 to Figure 3 As shown, a dual-motor drive system of the utility model includes:

[0033] The first motor 1 and the second motor 2 are arranged in parallel along the length direction of the vehicle body; in the width direction of the vehicle body, the first motor 1 and the second motor 2 are arranged in a staggered manner, and the output shafts of the first motor 1 and the second motor 2 are perpendicular to the length direction of the vehicle body. The first motor 1 and the second motor 2 are confined within a space with limited vehicle body size, reducing the size requirements in the width direction of the vehicle body.

[0034] A first planetary gear structure and a second planetary gear structure are arranged on the vehicle body. The first motor 1 is connected to the first output shaft 11 through the first planetary gear structure, and the second motor 2 is connected to the second output shaft 21 through the second planetary gear structure. The first output shaft 11 and the second output shaft 21 are respectively located on both sides of the vehicle body, and the first output shaft 11 and the second output shaft 21 are coaxially arranged.

[0035] It can be understood that in order to make the power output from the first output shaft 11 and the second output shaft 21 the same and to make the vehicle power transmission uniform, the first planetary gear structure and the second planetary gear structure are the same.

[0036] like Figure 2 As shown, in this embodiment, the first planetary gear structure and the second planetary gear structure are both single planetary gears. The single planetary gear includes a sun gear 31, a planetary gear 32, a ring gear 33 and a planet carrier 34. The output shaft of the first motor 1 is drivingly connected to the first input shaft 12. The sun gear 31 is fixedly connected to the first input shaft 12. The planetary gear 32 is meshed with the sun gear 31. The ring gear 33 is fixedly mounted on the vehicle body. The planetary gear 32 is meshed with the ring gear 33.

[0037] The planetary gear 32 is rotatably mounted on the planetary carrier 34, the planetary carrier 34 is fixedly connected to a transmission shaft 35, and is rotatably mounted on the vehicle body through the transmission shaft 35, the transmission shaft 35 is fixedly connected to a transmission gear 351, the first output shaft 11 is fixedly connected to an output gear 111, and the transmission gear 351 is meshed with the output gear 111. The transmission between the second planetary gear structure and the second output shaft 21 is the same as the transmission between the first planetary gear structure and the first output shaft 11, and will not be described in detail.

[0038] The single planetary gearbox has low installation requirements and is more adaptable to vehicles with smaller body sizes. At the same time, the single planetary gearbox can set the speed ratio to 8 to improve transmission efficiency.

[0039] like Figure 3 As shown, in another embodiment of the present application, the first planetary gear structure and the second planetary gear structure may also be a two-stage planetary gear. The two-stage planetary gear includes a sun gear 31, a planetary gear 32, a ring gear 33 and a planet carrier 34. The output shaft of the first motor 1 is drivingly connected to the first input shaft 12. The sun gear 31 is fixed to the first input shaft 12. The planetary gear 32 is meshed with the sun gear 31. The planetary gear 32 is rotatably mounted on the planet carrier 34.

[0040] The ring gear 33 is fixedly mounted on the vehicle body, and a secondary planetary gear 341 is arranged on the planetary carrier 34. The secondary planetary gear 341 and the planetary gear 32 form a double gear, and the secondary planetary gear 341 is meshed with the ring gear 33. The planetary carrier 34 is fixedly connected to a transmission shaft 35, and is rotatably mounted on the vehicle body through the transmission shaft 35. A transmission gear 351 is fixedly connected to the transmission shaft 35, and an output gear 111 is fixedly connected to the first output shaft 11, and the transmission gear 351 is meshed with the output gear 111. Replacing the single planetary gear with a secondary planetary gear can set the speed ratio to 14, and the transmission efficiency is higher.

[0041] It can be understood that since the wheels are symmetrical on the left and right, the left and right output shafts are required to be coaxial when the drive system outputs, and the transmission shaft 35 of the planetary gear structure can only be output coaxially with the output shaft of the drive motor. Since the first motor 1 and the second motor 2 are staggered in the width direction of the vehicle body, the transmission shafts 35 of the first planetary gear structure and the second planetary gear structure are not coaxial. In order to balance the problem of the left and right outputs not being coaxial after the first motor 1 and the second motor 2 are arranged in parallel, a secondary gear pair is set to be connected to the planetary gear structure, and the first output shaft 11 and the second output shaft 21 of the first motor 1 and the second motor 2 are pulled to be coaxial by setting the transmission gear 351, the output gear 111 and the first output shaft 11 or the second output shaft 21 to a parallel axis gear structure.

[0042] In this embodiment, a plurality of support bearings 4 are provided on the vehicle body, the first input shaft 12 connected to the first motor 1 is rotatably mounted on the vehicle body through a support bearing 4, the transmission shaft 35 of the first planetary gear structure is rotatably mounted on the vehicle body through a support bearing 4, and the first output shaft 11 is rotatably mounted on the vehicle body through two support bearings 4;

[0043] The second input shaft connected to the second motor 2 is rotatably mounted on the vehicle body through two support bearings 4, the transmission shaft 35 of the second planetary gear structure is rotatably mounted on the vehicle body through two support bearings 4, and the second output shaft 21 is rotatably mounted on the vehicle body through two support bearings 4. Transmission is performed through the planetary gear structure, and only 8 support bearings are needed for transmission. Compared with the general parallel shaft structure using 12 support bearings, the number of installed bearings is reduced in this embodiment, thereby reducing the cost.

[0044] The principle of the dual-motor drive system of this application is:

[0045] The power output by the first motor 1 is sequentially transmitted through the first input shaft 12 and the first planetary gear structure to the first output shaft 11, driving the first output shaft 11 to rotate, and the power output by the second motor 2 is sequentially transmitted through the second input shaft and the second planetary gear structure to the second output shaft 21, driving the second output shaft 21 to rotate. The present application also provides a vehicle, including the above-mentioned dual-motor drive system, wherein the dual-motor drive system is arranged on the vehicle body.

[0046] The above is a detailed introduction to a dual-motor power system and a vehicle provided by the utility model. The description of the specific embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements and modifications can be made to the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A dual-motor power system, characterized in that: include: A first motor (1), a second motor (2), a first planetary gear structure and a second planetary gear structure are mounted on a vehicle body; the first motor (1) and the second motor (2) are arranged in parallel along the length direction of the vehicle body; the first motor (1) is connected to a first output shaft (11) through the first planetary gear structure, and the second motor (2) is connected to a second output shaft (21) through the second planetary gear structure; the first output shaft (11) and the second output shaft (21) are respectively located on two sides of the vehicle body, and the first output shaft (11) and the second output shaft (21) are arranged coaxially.

2. A dual-motor power system according to claim 1, characterized in that: The first planetary gear structure and the second planetary gear are both single planetary gears.

3. A dual-motor power system according to claim 2, characterized in that: The single planetary gear train comprises a sun gear (31), planetary gears (32), a ring gear (33) and a planet carrier (34); the output shaft of the first motor (1) is drivingly connected to the first input shaft (12); the sun gear (31) is fixedly connected to the first input shaft (12); the planetary gears (32) are meshed with the sun gear (31); the ring gear (33) is fixedly mounted on a vehicle body; the planetary gears (32) are internally meshed with the ring gear (33); The planet carrier (34) is fixedly connected to a transmission shaft (35) and is rotatably mounted on a vehicle body via the transmission shaft (35); the planetary gear (32) is rotatably mounted on the planet carrier (34); a transmission gear (351) is fixedly connected to the transmission shaft (35); an output gear (111) is fixedly connected to the first output shaft (11); and the transmission gear (351) is meshed with the output gear (111).

4. A dual-motor power system according to claim 1, characterized in that: The first planetary gear structure and the second planetary gear are both two-stage planetary gears.

5. A dual-motor power system according to claim 4, characterized in that: The secondary planetary gear comprises a sun gear (31), planetary gears (32), a ring gear (33) and a planet carrier (34); the output shaft of the first motor (1) is drivingly connected to the first input shaft (12); the sun gear (31) is fixedly connected to the first input shaft (12); the planetary gears (32) are meshed with the sun gear (31); and the planetary gears (32) are rotatably mounted on the planet carrier (34); The ring gear (33) is fixedly mounted on the vehicle body; a secondary planetary gear (341) is arranged on the planetary carrier (34); the secondary planetary gear (341) and the planetary gear (32) form a double gear; the secondary planetary gear (341) is meshed with the ring gear (33); the planetary carrier (34) is fixedly connected to a transmission shaft (35) and is rotatably mounted on the vehicle body via the transmission shaft (35); a transmission gear (351) is fixedly connected to the transmission shaft (35); an output gear (111) is fixedly connected to the first output shaft (11); the transmission gear (351) is meshed with the output gear (111).

6. A dual-motor power system according to claim 1, characterized in that: In the width direction of the vehicle body, the first motor (1) and the second motor (2) are arranged in a staggered manner.

7. A dual-motor power system according to claim 3 or 5, characterized in that: It also includes a plurality of support bearings (4) arranged on the vehicle body. In the first planetary gear structure and the second planetary gear structure, the first input shaft (12) is rotatably mounted on the vehicle body via a support bearing (4), the transmission shaft (35) is rotatably mounted on the vehicle body via a support bearing (4), and the first output shaft (11) is rotatably mounted on the vehicle body via two support bearings (4).

8. A vehicle, characterized in that: It comprises a dual-motor power system as described in any one of claims 1-7, and the dual-motor power system is arranged on the vehicle.

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