Towing vehicle electric drive power system

Abstract

The utility model provides a tractor electric drive power system, including motor module, input module, variable speed module that transmits connection in proper order, variable speed module includes intermediate shaft with input module through the clutch connection, the gear shift tooth cover of slidable assembly along the axle direction on intermediate shaft, rotatable assembly on intermediate shaft gear position drive gear set, gear position driven gear set and gear position drive gear set with gear position drive gear set mesh with output shaft, and the number of intermediate shaft is at least two, and the gear shift tooth cover is combined with gear position drive gear set and forms the connection of intermediate shaft and output shaft along the axial sliding, the utility model improves the high efficiency interval coverage rate of motor, reduces energy consumption, avoids the tooth shaft damage among variable speed module under the sudden situation such as motor out of control, improves transmission safety, and reliability, avoids the power interruption of gear shifting, and reduces the gear shifting impact, improves the scene adaptability of electric drive power system, reduces energy and hardware loss.

Description

Technical Field

[0001] This utility model relates to an electric drive system for a tractor, belonging to the field of pure electric transmission drive technology. Background Technology

[0002] Heavy-duty freight trucks commonly employ a tractor-trailer cooperative operation mode. Traditionally, the trailer is unpowered and attached to the tractor, with the entire vehicle's power derived from the tractor. The tractor's average power is 100-150 kW, but its maximum power requirement is 400-500 kW. With the electrification and intelligentization of the automotive industry, new energy power units are beginning to be integrated into trailers to assist the tractor and jointly drive the entire vehicle, reducing the tractor's power requirements. While the tractor's electric drive assembly still needs to achieve optimal efficiency within the average power range and meet peak power demands, the tractor's gears, the number of motors, and the transmission structure can be simplified accordingly. Existing tractor drive systems have the following problems:

[0003] 1. It is not possible to match different motors and speed ratios according to the power requirements of different vehicles, and the coverage of the high-efficiency range of the motor needs to be improved.

[0004] 2. Tractor vehicles often use a dual-motor parallel scheme, which requires limiting the torque output of the motors. In special circumstances such as motor malfunction, the internal gear shaft of the system may be damaged.

[0005] 3. Mechanical automatic two-speed transmissions need to cut off power transmission when shifting gears, resulting in a power interruption of 0.5 to 1.5 seconds. This leads to problems such as poor adaptability to different scenarios, low energy efficiency, and high hardware wear.

[0006] 4. Drive systems often employ a structure that uses an input shaft and an intermediate shaft for transmission. Single-shaft transmissions have a large torque load, cause rapid gear wear, and carry the risk of transmission failure leading to the gearbox's ineffective operation. Utility Model Content

[0007] The electric drive system for tractors provided by this utility model improves the coverage of the high-efficiency range of the motor to reduce energy consumption, avoids damage to the gear shafts in the transmission module in the event of sudden situations such as motor malfunction, improves transmission safety, allows the number of intermediate shafts to be set according to the magnitude of the transmitted torque, reduces wear on the gears on the intermediate shafts, improves transmission reliability, extends the service life of the transmission module, avoids power interruption during gear shifting, reduces shifting shock, improves the scene adaptability of the electric drive system, and reduces energy and hardware losses.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] The electric drive system for a tractor includes a motor module, an input module, and a transmission module connected in sequence. The transmission module comprises an intermediate shaft connected to the input module via a clutch, a shift sleeve slidably mounted on the intermediate shaft along the axial direction, a gear drive gear set rotatably mounted on the intermediate shaft, a gear driven gear set meshing with the gear drive gear set, and an output shaft meshing with the gear drive gear set. The number of intermediate shafts is at least two. The shift sleeve slides axially and engages with the gear drive gear set to form a connection between the intermediate shaft and the output shaft.

[0010] Preferably, the motor module includes a motor one and a motor two, and the input module includes an input shaft one connected to the shaft end of motor one, an input shaft two connected to the shaft end of motor two, and a constant meshing shaft connected to an intermediate shaft via a clutch. A constant meshing gear one meshing with input shaft one and a constant meshing gear two meshing with input shaft two are coaxially fixed on the constant meshing shaft.

[0011] Preferably, the gear shift drive gear set includes a rotatable gear shift drive gear one mounted on an intermediate shaft and a rotatable gear shift drive gear two mounted on an intermediate shaft. The gear shift driven gear set includes a gear shift driven gear one meshing with the gear shift drive gear one and a gear shift driven gear two meshing with the gear shift drive gear two. The gear shift driven gear one and the gear shift driven gear two are coaxially fixed. The gear shift drive gear one and the gear shift drive gear two are located on both sides of the shift sleeve. The gear shift drive gear two meshes with the output shaft. The shift sleeve slides forward to engage with the gear shift master gear one and slides backward to engage with the gear shift master gear two.

[0012] Preferably, the number of the constant meshing shafts is equal to the number of intermediate shafts, and each intermediate shaft is connected to another intermediate shaft via a clutch.

[0013] Preferably, the output shaft is parallel to the intermediate shaft, and multiple intermediate shafts are evenly arranged on the outer periphery of the output shaft. The first gear driven gear and the second gear driven gear are coaxially fixed on the connecting shaft, and the connecting shaft is rotatably mounted on the output shaft.

[0014] Preferably, the gear shift drive gear has an integrally formed output pinion, and the output gear is coaxially fixed on the output shaft and meshes with the output pinion.

[0015] Preferably, it also includes a hydraulic damper that meshes with the output shaft, and a speed sensor is fixed coaxially on the output shaft.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses an electric drive system for a tractor, in which a motor module, an input module, and a transmission module are sequentially connected to form a modular transmission structure. The number of motors in the motor module and the gear shaft dimensions in the input and transmission modules can be configured according to drive requirements. This allows for matching different motors and speed ratios to the power needs of different vehicles, improving the coverage of the motor's high-efficiency range and reducing energy consumption. The intermediate shaft in the transmission module is connected to the input module via a clutch. In case of sudden events such as motor malfunction, the clutch can disconnect the input module from the transmission module, preventing damage to the gear shafts in the transmission module and improving transmission safety. The number of intermediate shafts can be set according to the magnitude of the transmitted torque, reducing the torque load on a single intermediate shaft during transmission, thereby reducing wear on the gears on the intermediate shaft, improving transmission reliability, and extending the service life of the transmission module. Multiple intermediate shafts are equipped with shift sleeves, which connect the intermediate shafts to the output shaft through sliding. During gear shifting, the shift sleeves on multiple intermediate shafts slide sequentially to avoid interruption of shifting power and reduce shifting impact, improving the scenario adaptability of the electric drive system and reducing energy and hardware losses. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the transmission structure of the electric drive system of the tractor in a specific implementation.

[0019] Figure 2 This is a schematic diagram of the transmission structure of the electric drive system of a tractor in first gear.

[0020] Figure 3 This is a schematic diagram of the transmission structure of the electric drive system of the tractor in second gear. Detailed Implementation

[0021] The following is combined Figures 1-3 The embodiments of this utility model will be described in detail below.

[0022] The electric drive system for a tractor includes a motor module 1, an input module 2, and a transmission module 3 connected in sequence. The transmission module 3 includes an intermediate shaft 5 connected to the input module 2 via a clutch 4, a shift sleeve 6 slidably mounted on the intermediate shaft 5 along the axial direction, a gear drive gear set 7 rotatably mounted on the intermediate shaft 5, a gear driven gear set 8 meshing with the gear drive gear set 7, and an output shaft 9 meshing with the gear drive gear set 7. The intermediate shaft 5 has at least two shafts. The shift sleeve 6 slides axially and engages with the gear drive gear set 7 to form a connection between the intermediate shaft 5 and the output shaft 9.

[0023] The electric drive system for the tractor described above consists of a motor module 1, an input module 2, and a transmission module 3 connected sequentially to form a modular transmission structure. The number of motors in the motor module 1 and the gear shaft dimensions in the input module 2 and transmission module 3 can be configured according to drive requirements. This allows for matching different motors and speed ratios to the power needs of different vehicles, improving the coverage of the motor's high-efficiency range and reducing energy consumption. The intermediate shaft 5 in the transmission module 3 is connected to the input module 2 via a clutch 4. In case of sudden events such as motor malfunction, the clutch can disconnect the input module from the transmission module 3, preventing power loss. To prevent gear shaft damage in the speed module and improve transmission safety, the number of intermediate shafts 5 can be set according to the magnitude of the transmitted torque, reducing the torque load on a single intermediate shaft 5 during transmission, thereby reducing wear on the gears on the intermediate shaft 5, improving transmission reliability, and extending the service life of the transmission module 3. Shift sleeves 6 are installed on multiple intermediate shafts 5, and the connection between the intermediate shaft 5 and the output shaft 9 is formed by the sliding of the shift sleeves. During gear shifting, the shift sleeves 6 on multiple intermediate shafts 5 slide sequentially to avoid interruption of shifting power and reduce shifting impact, thereby improving the scenario adaptability of the electric drive system and reducing energy and hardware losses.

[0024] The motor module 1 includes a first motor 11 and a second motor 12. The input module 2 includes an input shaft 21 connected to the shaft end of the first motor 11, an input shaft 22 connected to the shaft end of the second motor 12, and a constant meshing shaft 23 connected to the intermediate shaft 5 via a clutch 4. A constant meshing gear 24 meshing with the first input shaft 21 and a constant meshing gear 25 meshing with the second input shaft 22 are coaxially fixed on the constant meshing shaft 23. The first motor 11 transmits power to the constant meshing shaft 23 through the first input shaft 21 and the first constant meshing gear 24, and the second motor 12 also transmits power to the constant meshing shaft 23 through the second input shaft 22 and the second constant meshing shaft 25. The power from the first motor 11 and the second motor 12 converges on the constant meshing shaft 23. One or both motors can be started according to driving requirements. For example, when the tractor is traveling at high speed without a trailer, only one motor can be started. The gear shifting module allows the motor to operate in the high-efficiency range, thus meeting driving requirements while reducing energy consumption.

[0025] The gear shift drive gear set 7 includes a rotatable gear shift drive gear 71 mounted on the intermediate shaft 5 and a rotatable gear shift drive gear 72 mounted on the intermediate shaft 5. The gear shift driven gear set 8 includes a gear shift driven gear 81 meshing with the gear shift drive gear 71 and a gear shift driven gear 82 meshing with the gear shift drive gear 72. The gear shift driven gear 81 and the gear shift driven gear 82 are coaxially fixed. The gear shift drive gear 71 and the gear shift drive gear 72 are located on both sides of the shift sleeve 6. The gear shift drive gear 72 meshes with the output shaft 9. The shift sleeve 6 slides forward to engage with the gear shift drive gear 71 and slides backward to engage with the gear shift drive gear 72. When the shift sleeve 6 slides forward and engages with the first gear drive gear 71, the power of the intermediate shaft 5 is transmitted to the second gear drive gear 72 via the first gear drive gear 71, the first gear driven gear 81, and the second gear driven gear 81. The second gear drive gear 72 drives the output shaft 9 to rotate, which reduces the power of the intermediate shaft 5 and transmits it to the output shaft 9, forming first gear power on the output shaft 9. When the shift sleeve 6 slides backward and engages with the second gear drive gear 72, the power of the intermediate shaft 5 is directly transmitted to the output shaft 6 via the second gear drive gear 72, forming second gear power on the output shaft 9. The torque of the second gear power is lower than that of the first gear power, but the speed is higher than that of the first gear power. The gear driven gear set 8 only participates in the transmission when driving in first gear and does not participate in the drive when driving in second gear. The transmission structure in the transmission module 2 is simple and compact.

[0026] The number of the constantly engaged shafts 23 is equal to the number of the intermediate shafts 5. Each intermediate shaft 5 is connected to one intermediate shaft 23 via a clutch 4. As shown in the figure, there are two intermediate shafts 5. The constantly engaged shafts 23 and intermediate shafts 5 correspond one-to-one and are connected via clutches 4. The clutches 4 control the connection or disconnection between the input module 2 and the transmission module 3 to promptly cut off the transmission in case of emergencies and improve safety.

[0027] The output shaft 9 is parallel to the intermediate shaft 5, and multiple intermediate shafts 5 are evenly arranged on the outer periphery of the output shaft 9. Gear driven gear 1 81 and gear driven gear 2 82 are coaxially fixed on the connecting shaft 83, which is rotatably mounted on the output shaft 9. The multiple intermediate shafts 5 bear load synchronously during transmission, reducing the torque load on a single intermediate shaft 5 and improving transmission reliability. The connecting shaft 93 is rotatably mounted on the output shaft 9, making full use of the radial space between the multiple intermediate shafts 5 to set up the gear driven gear set 8 and the output shaft 9. The output shaft 9 forms support for the gear driven gear set 8, thus reducing axial dimensions, improving space utilization and structural compactness, while ensuring the meshing reliability of the gear driven gear set 8 and the gear driving gear set 7, thereby improving transmission reliability.

[0028] The gear shift drive gear 72 has an integrally formed output pinion 73, and an output gear 91 coaxially fixed to the output shaft 9 and meshing with the output pinion 73. The output pinion 73 transmits the power of the gear shift drive gear 72 to the output gear 91, driving the output shaft 9 to rotate. The gear shift drive gear 72 is used to engage with the backward sliding shift sleeve 6, mesh with the gear shift driven gear 82, and mesh with the output gear 91. When the shift sleeve 6 is in the neutral position between the gear shift drive gear 71 and the gear shift drive gear 72, the intermediate shaft 5 is not connected to the output shaft 9, and the power of the intermediate shaft 5 cannot be transmitted to the output shaft 9. When the shift sleeve 6 engages with the gear shift drive gear 71, the power of the intermediate shaft 5... The gear shift drive gear 71, gear shift driven gear 81, and gear shift driven gear 82 transmit power to the gear shift drive gear 72. The gear shift drive gear 72 drives the output shaft 9 to rotate. When the shift sleeve 6 engages with the gear shift drive gear 72, the intermediate shaft 5 drives the gear shift drive gear 72 to move. The gear shift drive gear 72 drives the output shaft 9 to rotate. Only when the shift sleeve 6 engages with the gear shift drive gear 71 or the gear shift drive gear 72 can the intermediate shaft 5 be connected to the output shaft 6, and the power of the intermediate shaft 5 can be transmitted to the output shaft 6.

[0029] This system also includes a hydraulic damper 10 that meshes with the output shaft 9, and a speed sensor 92 that is coaxially fixed on the output shaft 9. The speed sensor 92 senses the speed of the output shaft 9 in real time. When the tractor is descending a long slope, if the speed of the output shaft 9 is too fast, the speed of the output shaft 9 can be reduced by the hydraulic damper 10 to prevent the vehicle from losing control too quickly when descending a long slope. When descending a long slope, the shift sleeve 6 can be engaged with the gear drive gear set 7, and the power of the output shaft 9 can be transmitted to the motor module 1 through the transmission module 3 and the input module 2 to charge the motor and form energy recovery.

[0030] The above-mentioned electric drive system for tractors, such as Figure 2 As shown, when the shift sleeve 6 slides forward and engages with the gear main gear 71, the power of the motor module 1 is transmitted to the intermediate shaft 5 via the input module 2. The intermediate shaft 5 transmits the power to the gear drive gear 71. The gear drive gear 71 drives the gear driven gear 81 to rotate. The gear driven gear 81 drives the gear driven gear 82 to rotate. The gear driven gear 82 drives the gear drive gear 72 to rotate. The gear drive gear 72 drives the output shaft 9 to rotate, thus forming the first gear drive for the tractor.

[0031] like Figure 3 As shown, when the shift sleeve 6 slides backward and engages with the second gear drive gear 72, the power of the motor module 1 is transmitted to the intermediate shaft 5 via the input module 2. The intermediate shaft 5 then transmits the power to the second gear drive gear 72, which directly drives the output shaft 9 to rotate, thus forming a second-gear drive for the tractor.

[0032] The driven gear set 8 only participates in the transmission when driving in first gear and does not participate in the transmission when driving in second gear, resulting in high transmission efficiency. As can be seen from the attached figure, there are two intermediate shafts 5. By shifting the gear sleeves 6 on the two intermediate shafts 5 one after the other, the power can be uninterrupted during the shifting process, and the shifting shock can be reduced, thus improving the driving comfort.

[0033] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A tractor electric drive system, comprising a motor module, an input module, and a transmission module connected in sequence, characterized in that: The transmission module includes an intermediate shaft connected to the input module via a clutch, a shift sleeve slidably mounted on the intermediate shaft along the axial direction, a gear drive gear set rotatably mounted on the intermediate shaft, a gear driven gear set meshing with the gear drive gear set, and an output shaft meshing with the gear drive gear set. The number of intermediate shafts is at least two. The shift sleeve slides along the axial direction and engages with the gear drive gear set to form a connection between the intermediate shaft and the output shaft.

2. The electric drive system for a tractor according to claim 1, characterized in that: The motor module includes a motor one and a motor two. The input module includes an input shaft one connected to the shaft end of motor one, an input shaft two connected to the shaft end of motor two, and a constant meshing shaft connected to an intermediate shaft via a clutch. A constant meshing gear one meshing with input shaft one and a constant meshing gear two meshing with input shaft two are coaxially fixed on the constant meshing shaft.

3. The electric drive system for a tractor according to claim 2, characterized in that: The gear shift drive gear set includes a rotatable gear shift drive gear 1 mounted on an intermediate shaft and a rotatable gear shift drive gear 2 mounted on an intermediate shaft. The gear shift driven gear set includes a gear shift driven gear 1 meshing with gear shift drive gear 1 and a gear shift driven gear 2 meshing with gear shift drive gear 2. Gear shift driven gear 1 and gear shift driven gear 2 are coaxially fixed. Gear shift drive gear 1 and gear shift drive gear 2 are located on both sides of the shift sleeve. Gear shift drive gear 2 meshes with the output shaft. The shift sleeve slides forward to engage with gear shift drive gear 1 and slides backward to engage with gear shift drive gear 2.

4. The electric drive system for a tractor according to claim 3, characterized in that: The number of the constant meshing shafts is equal to the number of intermediate shafts, and each intermediate shaft is connected to another intermediate shaft via a clutch.

5. The electric drive system for a tractor according to claim 4, characterized in that: The output shaft is parallel to the intermediate shaft, and multiple intermediate shafts are evenly arranged on the outer periphery of the output shaft. The first gear driven gear and the second gear driven gear are coaxially fixed on the connecting shaft, and the connecting shaft is rotatably mounted on the output shaft.

6. The electric drive system for a tractor according to claim 3, characterized in that: The aforementioned gear shift drive gear has an integrally formed output pinion, and an output gear coaxially fixed on the output shaft and meshing with the output pinion.

7. The electric drive system for a tractor according to claim 1, characterized in that: It also includes a hydraulic damper that meshes with the output shaft, and a speed sensor that is coaxially fixed on the output shaft.

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