Two-gear coaxial electric drive system

Abstract

This utility model discloses a two-speed coaxial electric drive system, including a motor, a sun gear fixedly connected to the output shaft of the motor, a ring gear of the motor, and planet gears between the sun gear and the ring gear, the planet gears meshing with the sun gear and the ring gear; the planet gears include a planet carrier, a differential is provided inside the motor, the differential is connected to a first output shaft and a second output shaft, and a bevel gear set is connected between the planet carrier and the differential. The two-speed coaxial electric drive system of this utility model has a simple structure, small space occupation, and reduced cost.

Description

Technical Field

[0001] This utility model belongs to the field of electric drive systems. Specifically, this utility model relates to a two-speed coaxial electric drive system. Background Technology

[0002] The current two-speed drive system has a complex structure and occupies a large space, which is not conducive to the spatial layout of the electric drive system. The available high-efficiency range of the motor is lower, which increases power consumption and cannot improve the overall vehicle range. At the same time, the control method is also relatively complex, which increases the cost of the electric drive system.

[0003] Patent CN113910881A, published on January 11, 2022, discloses an invention entitled "An Electric Drive Axle Based on Clutch Planetary Shifting," comprising a left half-shaft, a right half-shaft, a drive motor, a first transmission gear, a second transmission gear, a third transmission gear, a fourth transmission gear, a planetary transmission mechanism, a lock-up clutch, a clutch, and a differential. The first transmission gear is connected to the motor rotor and meshes with the second transmission gear; the second transmission gear is connected to the third transmission gear and meshes with the fourth transmission gear; the fourth transmission gear is connected to the sun gear; the planetary carrier is connected to the differential; and the left half-shaft passes through the middle of the motor rotor, the fourth transmission gear, and the sun gear. This two-speed coaxial electric drive system has a complex structure and cannot completely solve the aforementioned technical problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a two-stage coaxial electric drive system that is simple in structure, occupies little space, and reduces costs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] The two-speed coaxial electric drive system includes a motor, the output shaft of which is fixedly connected to a sun gear, the motor including a ring gear, and planet gears provided between the sun gear and the ring gear, the planet gears meshing with the sun gear and the ring gear; the planet gears including a planet carrier, a differential provided inside the motor, the differential being connected to a first output shaft and a second output shaft, and a bevel gear set connected between the planet carrier and the differential.

[0007] The bevel gear set includes an intermediate shaft, on which an output bevel gear is fixedly connected. The planetary carrier is a bevel gear structure, and the planetary carrier meshes with the output bevel gear. A first-gear driven bevel gear and a second-gear driven bevel gear are fixedly connected to the differential. A shifting device is also provided on the intermediate shaft. A first-gear driving bevel gear and a second-gear driving bevel gear are respectively provided on both sides of the shifting device. The first-gear driving bevel gear corresponds to the first-gear driven bevel gear, and the second-gear driving bevel gear corresponds to the second-gear driven bevel gear.

[0008] The axis of the intermediate shaft is perpendicular to the axis of the planet carrier.

[0009] The first output shaft and the second output shaft are coaxially arranged, with the second output shaft passing through the sun gear.

[0010] The size of the first gear driving bevel gear is smaller than that of the second gear driving bevel gear, and the size of the first gear driven bevel gear is smaller than that of the second gear driven bevel gear; the first gear driving bevel gear is located on the intermediate shaft near the output bevel gear, and the first gear driven bevel gear is located on the differential near the second output shaft; the first gear driving bevel gear is located on the intermediate shaft away from the output bevel gear, and the first gear driven bevel gear is located on the differential away from the second output shaft.

[0011] The shifting device is a wet clutch, a jaw clutch, an electromagnetic clutch, or a synchronizer.

[0012] The first driven bevel gear and the second driven bevel gear are fixed to the differential by bolting, welding, riveting or interference fit.

[0013] The technical advantages of this utility model are as follows: The two-speed coaxial electric drive system of this utility model uses bevel gears to achieve a spatially staggered arrangement of the motor's input bevel gear and the intermediate shaft. Furthermore, both the first and second driven gears are integrated into the differential, resulting in a compact structure with minimal axial and radial space occupation, facilitating the layout of the electric drive system. The bevel gear connection and shifting device form two driving positions in the electric drive system, allowing the motor to operate in the high-efficiency range for a longer period, reducing the power requirements of the motor, lowering the cost of the electric drive system, further reducing power consumption, and increasing the driving range. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following:

[0015] Figure 1 This is a schematic diagram of the arrangement of the two-speed coaxial electric drive system of this utility model;

[0016] The markings in the diagram are as follows: 1. Motor; 2. Sun gear; 3. Planetary gears; 4. Ring gear; 5. Planetary carrier; 6. Output bevel gear; 7. First gear driving bevel gear; 8. First gear driven bevel gear; 9. Second gear driving bevel gear; 10. Second gear driven bevel gear; 11. Intermediate shaft; 12. Gear shifting device; 13. Differential; 14. First output shaft; 15. Second output shaft. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of this invention, and to facilitate its implementation.

[0018] like Figure 1 As shown, this two-speed coaxial electric drive system includes a motor 1, with a sun gear 2 fixedly connected to the output shaft of the motor 1. The motor 1 includes a ring gear 4, and planet gears 3 are located between the sun gear 2 and the ring gear 4, meshing with the sun gear 2 and the ring gear 4. The planet gears 3 include a planet carrier 5. A differential 13 is located inside the motor 1, and the differential 13 is connected to a first output shaft 14 and a second output shaft 15. A bevel gear set is connected between the planet carrier 5 and the differential 13. The sun gear 2 serves as the rotating shaft of the motor 1 and is geared to the planet gears 3. The outer diameter of the ring gear 4 is fixed to the housing of the motor 1. The two driven bevel gears are located on the differential 13, and the two output shafts are connected to the differential 13. Power transmission between the planet carrier 5 and the differential 13 is achieved using a bevel gear set, and a shifting device is used to achieve two-speed power output. Using a bevel gear set to transmit power can reduce space occupation and meet the space-constrained layout requirements of the electric drive system.

[0019] like Figure 1 As shown, the bevel gear set includes an intermediate shaft 11, on which an output bevel gear 6 is fixedly connected. The planetary carrier 5 has a bevel gear structure and meshes with the output bevel gear 6. A first-gear driven bevel gear 8 and a second-gear driven bevel gear 10 are fixedly connected to the differential 13. A shifting device 12 is also provided on the intermediate shaft 11. A first-gear driving bevel gear 7 and a second-gear driving bevel gear 9 are respectively provided on both sides of the shifting device 12. The first-gear driving bevel gear 7 corresponds to the first-gear driven bevel gear 8, and the second-gear driving bevel gear 9 corresponds to the second-gear driven bevel gear 10. The bevel gear set realizes the spatial staggered arrangement of the input bevel gear of the motor 1 and the intermediate shaft 11. This facilitates assembly by dividing the gears and their associated structures into two directions, avoiding the situation where all gears are concentrated in one direction, thus reducing the assembly difficulty. The planetary carrier 5 and the output bevel gear 6 are connected by gears. The shifting device 12 is located on the intermediate shaft 11. The first gear driving bevel gear 7 and the second gear driving bevel gear 9 are connected to the intermediate shaft 11 through the shifting device 12. The shifting device 12 allows the intermediate shaft 11 to be connected to either the first gear driving bevel gear 7 or the second gear driving bevel gear 9, realizing the driving of two gears. In the unengaged state, it is in neutral, realizing the power decoupling between the intermediate shaft 11 and the first output shaft 14 and the second output shaft 15.

[0020] like Figure 1As shown, the axis of the intermediate shaft 11 is perpendicular to the axis of the planetary carrier 5. This structure satisfies the directional arrangement between adjacent bevel gears, making the meshing of adjacent gears more accurate, which helps ensure smooth power transmission, improves the service life and transmission efficiency of the electric drive system, reduces maintenance costs, and facilitates spatial arrangement and component assembly.

[0021] like Figure 1 As shown, the first output shaft 14 and the second output shaft 15 are coaxially arranged, with the second output shaft 15 passing through the sun gear 2. This structure, by having the second output shaft 15 pass through the sun gear 2, saves space in the arrangement of the second output shaft 15 and also facilitates the coaxial arrangement of the two output shafts.

[0022] like Figure 1 As shown, the size of the first-gear driving bevel gear 7 is smaller than that of the second-gear driving bevel gear 9, and the size of the first-gear driven bevel gear 8 is smaller than that of the second-gear driven bevel gear 10. The first-gear driving bevel gear 7 is located on the intermediate shaft 11 near the output bevel gear 6, and the first-gear driven bevel gear 8 is located on the differential 13 near the second output shaft 15. The first-gear driving bevel gear 7 is located on the intermediate shaft 11 away from the output bevel gear 6, and the first-gear driven bevel gear 8 is located on the differential 13 away from the second output shaft 15. This structure arranges the bevel gears from the inside out according to their size. While satisfying two-gear drive requirements, it also places the smaller bevel gear closer to the center of the electric drive system, which helps to improve the structural compactness and further reduce space occupation.

[0023] like Figure 1 As shown, the shifting device 12 is a wet clutch, a jaw clutch, an electromagnetic clutch, or a synchronizer. The shifting device 12 can utilize various of these components to achieve the shifting function, thus improving its versatility.

[0024] like Figure 1 As shown, the first driven bevel gear 8 and the second driven bevel gear 10 are fixed to the differential 13 by bolts, welding, riveting, or interference fit. The integration of the first driven bevel gear 8 and the second driven bevel gear 10 into the differential 13 housing facilitates integrated design, reduces axial and radial space requirements, facilitates electric drive system layout, improves the structural compactness of the aforementioned structure, reduces the number of parts during assembly, and promotes overall installation and improved efficiency.

[0025] like Figure 1 As shown, the output shaft of motor 1 drives the sun gear 2 to rotate, and the power is transmitted to the planet gears 3 through the sun gear 2 and the ring gear 4. Multiple planet gears 3 drive the planet carrier 5 to rotate, and at the same time transmit the power to the output bevel gear 6. The output bevel gear 6 synchronously drives the intermediate shaft 11. The shifting device 12 on the intermediate shaft 11 is activated to drive the first or second gear bevel gear drive, and then transmit the power to the differential 13.

[0026] Pure electric first gear direct drive mode: such as Figure 1 As shown, the first gear drive bevel gear 7 is connected to the intermediate shaft 11 via the shifting device 12. In this case, the power output from the motor 1 is transmitted sequentially through the sun gear 2, planet gears 3, planet carrier 5, first gear drive bevel gear 7, first gear driven bevel gear 8, differential 13, and then to the first output shaft 14 and the second output shaft 15. Thus, the vehicle is driven in pure electric first gear drive mode.

[0027] Pure electric second-gear direct drive mode: such as Figure 1 As shown, the second-gear drive bevel gear 9 is connected to the intermediate shaft 11 via the shifting device 12. In this case, the power output from the motor 1 is transmitted sequentially through the sun gear 2, planet gears 3, planet carrier 5, second-gear drive bevel gear 9, second-gear driven bevel gear 10, differential 13, and then to the first output shaft 14 and the second output shaft 15. Thus, the vehicle is driven in pure electric second-gear drive mode.

[0028] In summary, the system can achieve two pure electric driving modes depending on the engagement of different gears in the shifting device 12.

[0029] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A two-gear coaxial electric drive system, characterized in that: The device includes a motor (1), the output shaft of which is fixedly connected to a sun gear (2), the motor (1) includes a ring gear (4), and a planet gear (3) is provided between the sun gear (2) and the ring gear (4), the planet gear (3) meshing with the sun gear (2) and the ring gear (4); the planet gear (3) includes a planet carrier (5), the motor (1) is provided with a differential (13), the differential (13) is connected to a first output shaft (14) and a second output shaft (15), and a bevel gear set is connected between the planet carrier (5) and the differential (13).

2. The two-gear coaxial electric drive system according to claim 1, characterized in that: The bevel gear set includes an intermediate shaft (11), on which an output bevel gear (6) is fixedly connected. The planetary carrier (5) is a bevel gear structure and meshes with the output bevel gear (6). The differential (13) is fixedly connected with a first-gear driven bevel gear (8) and a second-gear driven bevel gear (10). The intermediate shaft (11) is also provided with a shifting device (12). The shifting device (12) has a first-gear driving bevel gear (7) and a second-gear driving bevel gear (9) on both sides. The first-gear driving bevel gear (7) corresponds to the first-gear driven bevel gear (8), and the second-gear driving bevel gear (9) corresponds to the second-gear driven bevel gear (10).

3. The two-gear coaxial electric drive system according to claim 2, characterized in that: The axis of the intermediate shaft (11) is perpendicular to the axis of the planetary carrier (5).

4. The two-gear coaxial electric drive system according to claim 3, characterized in that: The first output shaft (14) and the second output shaft (15) are coaxially arranged, and the second output shaft (15) passes through the sun gear (2).

5. The two-gear coaxial electric drive system according to claim 4, characterized in that: The size of the first gear driving bevel gear (7) is smaller than that of the second gear driving bevel gear (9), and the size of the first gear driven bevel gear (8) is smaller than that of the second gear driven bevel gear (10). The first gear driving bevel gear (7) is located on the intermediate shaft (11) at one end close to the output bevel gear (6), and the first gear driven bevel gear (8) is located on the differential (13) at one end close to the second output shaft (15). The first gear driving bevel gear (7) is located on the intermediate shaft (11) at one end away from the output bevel gear (6), and the first gear driven bevel gear (8) is located on the differential (13) at one end away from the second output shaft (15).

6. The two-gear coaxial electric drive system according to claim 5, characterized in that: The shifting device (12) is a wet clutch, a jaw clutch, an electromagnetic clutch, or a synchronizer.

7. The two-speed coaxial electric drive system according to claim 2, characterized in that: The first driven bevel gear (8) and the second driven bevel gear (10) are fixed to the differential (13) by bolt connection, welding, riveting or interference connection.

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