Dual-motor drive assembly system and gear adjusting method thereof

Abstract

The invention relates to a dual-motor drive assembly system which comprises a power output source, and an input unit is oppositely arranged on the power output source so as to be connected with a speed reduction unit. The speed reduction unit transmits the torque to the low-speed driving gear; a first compound gear shaft is arranged at the output end of the low-speed driving gear, the first compound gear shaft and the low-speed driving gear are in meshing transmission with a second compound gear shaft, the second compound gear shaft comprises two gears different in modulus, and the output shaft gear is arranged at the output end of the second compound gear shaft. And the output shaft gear is meshed with the pinion of the first compound gear shaft to finish torque output so as to meet the requirements of the whole vehicle. By using the two intermediate shafts, the gearbox can more effectively distribute power from different motors, energy loss is reduced, and transmission efficiency is improved. And due to the multi-gear design, the mine car can keep the optimal performance under different loads and speeds.

Description

Technical Field

[0001] The present invention relates to the field of motor drive technology, and more specifically, to a dual-motor drive assembly system and a gear adjustment method thereof. Background Art

[0002] As the core part of the power system of new energy heavy trucks, the performance of the central electric drive assembly directly affects the overall efficiency and operating costs of the vehicle. The central electric drive assembly is a powertrain that integrates the drive motor and the gearbox, replacing the traditional engine and gearbox, but still requires a drive shaft and a traditional axle. In terms of layout, the central electric drive assembly is similar to the traditional automotive powertrain. However, its transmission route is long, the energy loss is large, the system efficiency is low, and a large amount of bottom space is occupied.

[0003] After searching, 202011302871.0 discloses a torque vector control system, method, powertrain and vehicle of a parallel shaft dual motor. The system includes a first reduction unit that transmits the output torque of the first motor to the first wheel mechanism, a second reduction unit that transmits the output torque of the second motor to the second wheel mechanism, a clutch unit that controls the separation and combination of the two motor output shafts, a clutch unit that controls the separation and combination of the first motor and the first reduction unit, a clutch unit that controls the separation and combination of the second motor and the second reduction unit, and a control unit that controls the switching state and transmission power of the three clutch units. The method includes the steps of controlling the switching state and transmission power of the three clutch units accordingly according to the torque vector distribution instruction. The powertrain includes the above system, and the vehicle includes the powertrain. It can solve the problem that the four-wheel drive force free control system may cause low motor operation efficiency due to the inability to realize single-motor driven vehicle driving.

[0004] Although the mainstream integrated electric drive axle solutions on the market have advantages in transmission efficiency and smoothness, there is still room for improvement under certain working conditions. Therefore, the development of an efficient and reliable central electric drive assembly has become an urgent need for the development of the industry. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a dual-motor drive assembly system. By using two intermediate shafts, the gearbox can more effectively distribute the power from different motors, reduce energy loss, and improve transmission efficiency. The multi-gear design enables the mining car to maintain optimal performance under different loads and speeds.

[0006] The above-mentioned purpose of the present invention is achieved by the following technical solutions: Disclosed is a dual-motor drive assembly system, comprising a power output source, wherein the power output source is relatively arranged with an input unit to connect a reduction unit; the reduction unit transmits torque to a low-speed driving gear; a first composite gear shaft is arranged at the output end of the low-speed driving gear, and the first composite gear shaft and the low-speed driving gear are respectively meshed with a second composite gear shaft for transmission; the second composite gear shaft comprises two gears with different modules, and an output shaft gear is arranged at the output end of the second composite gear shaft, and the output shaft gear is meshed with a pinion of the first composite gear shaft to complete torque output to meet the needs of the entire vehicle.

[0007] The dual-motor drive assembly system of the present invention sets the power output source as dual motors. The dual motors and dual intermediate shafts work together to improve the overall efficiency of the gearbox and reduce energy waste. The compact structural design helps to reduce material usage and thus reduce the overall weight, which is crucial to improving the fuel economy and performance of the mining car.

[0008] Furthermore, the power output source includes motor 1 and motor 2 which are arranged relatively to each other, and motor 1 and motor 2 are respectively connected to output shaft 1 and output shaft 2 through splines; output shaft 1 and output shaft 2 are respectively meshed and connected to constant mesh gear 1 and constant mesh gear 2.

[0009] Furthermore, the constant mesh gear 1 and the constant mesh gear 2 are fixedly connected to the intermediate shaft 1 and the intermediate shaft 2 respectively.

[0010] Furthermore, the intermediate shaft 1 and the intermediate shaft 2 are provided with gear sleeves combined with the low-speed driving gear 1 and the low-speed driving gear 2.

[0011] Furthermore, the first composite gear shaft comprises composite driving gear 1 and composite driving gear 2, and the composite driving gear 1 and composite driving gear 2 are arranged on a side of the gear sleeve away from the low-speed driving gear 1 and the low-speed driving gear 2.

[0012] Furthermore, the second composite gear shaft adopts a double-tooth process and includes a low-speed driven gear and a high-speed driven gear.

[0013] Further, the low-speed driven gear is meshed with the low-speed driving gear, and the high-speed driven gear is meshed with the first composite gear shaft.

[0014] Furthermore, the second compound gear shaft adopts a suspended structure design, is supported by low-speed driving teeth on both sides and the first compound gear shaft, and has a rotation speed inconsistent with that of the output shaft.

[0015] Another object of the present invention is to disclose a gear adjustment method for the above-mentioned dual-motor drive assembly system, wherein the power output source transmits power to the input shaft one through a spline connection, the constant meshing gear one is fixedly connected to the intermediate shaft one, and when the gear sleeve is combined with the low-speed driving gear one, the torque is transmitted from the intermediate shaft one to the low-speed driving gear one, and then transmitted to the second compound gear shaft, which is supported by the low-speed driving teeth on both sides and the first compound gear shaft, and is inconsistent with the rotation speed of the output shaft; the torque is transmitted to the compound gear shaft one by the high-speed driven gear in the second compound gear shaft, and finally the torque is transmitted to the output shaft by the pinion of the compound gear shaft one, and the power on both sides merges to complete the output of torque and speed.

[0016] Another object of the present invention is to disclose a gear adjustment method for the above-mentioned dual-motor drive assembly system. When the gear sleeve is engaged with the compound gear shaft one, the torque is transmitted from the input shaft one to the constant mesh gear one, the intermediate shaft one transmits the torque to the compound gear shaft one, and the compound gear shaft one transmits the torque to the output shaft, so that the transmission route completes the secondary deceleration.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a dual-motor drive assembly system. By using two intermediate shafts, the gearbox can more effectively distribute power from different motors, reduce energy loss, and improve transmission efficiency.

[0018] The present invention discloses a dual-motor drive assembly system that provides powerful power for a multi-motor configuration while also improving the flexibility and efficiency of the system to meet the power requirements of heavy-duty mining vehicles. The 2-speed transmission design can select the most suitable gear according to different working conditions and optimize power output.

[0019] The present invention utilizes the characteristics of compact structure and wide transmission speed ratio range of the planetary gear, effectively reduces the overall size and weight, and achieves lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a power transmission diagram of the dual-motor drive assembly system described in the present invention.

[0021] Figure 2 This is a first-gear power flow diagram of the power transmission of the dual-motor drive assembly system described in the present invention.

[0022] Figure 3 This is a second-gear power flow diagram of the power transmission of the dual-motor drive assembly system described in the present invention.

[0023] Among them, 1-input shaft one, 2-input shaft two, 3-constant mesh gear one, 4-constant mesh gear two, 5-intermediate shaft one, 6-intermediate shaft two, 7-low speed driving gear one, 8-low speed driving gear two, 9-compound driving gear one, 10-compound driving gear two, 11-second compound gear shaft, 12-output shaft. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims. Example 1

[0025] like Figure 1-Figure 3 As shown, the dual-motor drive assembly system of this embodiment includes a power output source, and the power output source is relatively arranged with an input unit (input shaft 1 and input shaft 2) to connect the reduction unit; the reduction unit transmits the torque to the low-speed driving gear; a first compound gear shaft is arranged at the output end of the low-speed driving gear, and the first compound gear shaft and the low-speed driving gear are respectively meshed with the second compound gear shaft 11 for transmission, and the second compound gear shaft 11 includes two gears with different modules, and the output shaft gear 12 is arranged at the output end of the second compound gear shaft 11, and the output shaft gear 12 is meshed with the pinion of the first compound gear shaft to complete the torque output to meet the needs of the whole vehicle.

[0026] The power output source in this embodiment includes a motor 1 M1 and a motor 2 M2 which are arranged relatively to each other. The motor 1 M1 and the motor 2 M2 are respectively connected to the output shaft 1 and the output shaft 2 2 through splines; the output shaft 1 and the output shaft 2 2 are respectively meshed and connected with the constant mesh gear 1 3 and the constant mesh gear 2 4 to form a part of the reduction unit.

[0027] Among them, the constant meshing gear 1 3 and the constant meshing gear 2 4 are respectively fixedly connected to the intermediate shaft 1 5 and the intermediate shaft 2 6. The intermediate shaft 1 5 and the intermediate shaft 2 6 are provided with gear sleeves combined with the low speed driving gear 1 7 and the low speed driving gear 2 8.

[0028] In this embodiment, the first composite gear shaft includes composite driving gear 1 9 and composite driving gear 2 10 which are arranged opposite to each other. Composite driving gear 1 9 and composite driving gear 2 10 are arranged coaxially with low-speed driving gear 1 7 and low-speed driving gear 2 8 respectively. The gear sleeve is arranged between low-speed driving gear 1 7 and composite driving gear 1 9 (low-speed driving gear 2 8 and composite driving gear 2 10). That is, composite driving gear 1 9 and composite driving gear 2 10 are arranged on the side away from low-speed driving gear 1 7 and low-speed driving gear 2 8.

[0029] The second composite gear shaft 11 in this embodiment adopts a double-tooth process and includes a low-speed driven gear and a high-speed driven gear. The low-speed driven gear meshes with the low-speed driving gear, and the high-speed driven gear meshes with the first composite gear shaft.

[0030] The second composite gear shaft 11 adopts a suspended structure design, is supported by low-speed driving teeth on both sides and the first composite gear shaft, and has a rotation speed inconsistent with that of the output shaft.

[0031] By using two intermediate shafts, the gearbox can more efficiently distribute power from different motors, reduce energy loss, and improve transmission efficiency, achieving high-efficiency conversion.

[0032] In addition, the second composite gear shaft 11 is divided into a large gear and a small gear, and adopts a double-tooth process and a two-gear design, which can achieve higher transmission efficiency and is suitable for occasions requiring efficient transmission. The double-gear process design is strict, which can ensure that its tooth profile is high in precision and is suitable for occasions with high precision requirements.

[0033] The special structure of the duplex gear can effectively reduce vibration and is suitable for occasions where mechanical vibration needs to be reduced. Due to its stable structure, the duplex gear produces less noise during operation and is suitable for occasions where noise control is required. The duplex gear can withstand a large amount of torque and load and is suitable for occasions where high load transmission is required.

[0034] The gear adjustment method of the dual-motor drive assembly system in this embodiment. In the first gear, taking the M1 side as an example, the M2 side is consistent, the power output source transmits power to the input shaft 1 through a spline connection, the constant meshing gear 3 is fixedly connected with the intermediate shaft 5, when the gear sleeve is combined with the low-speed driving gear 7, the torque is transmitted from the intermediate shaft 5 to the low-speed driving gear 7, and then transmitted to the second composite gear shaft 11, supported by the low-speed driving gears on both sides and the first composite gear shaft, which is inconsistent with the speed of the output shaft; the torque is transmitted to the composite gear shaft 9 by the high-speed driven gear in the second composite gear shaft 11, and finally the pinion of the composite gear shaft 9 transmits the torque to the output shaft, the power on both sides merges, and the output of torque and speed is completed.

[0035] In the first gear, the gear adjustment method of the dual-motor drive assembly system is that when the gear sleeve is engaged with the compound gear shaft 9, the torque is transmitted from the input shaft 1 to the constant mesh gear 3, the intermediate shaft 5 transmits the torque to the compound gear shaft 9, and the compound gear shaft 9 transmits the torque to the output shaft, so that the transmission route completes the secondary deceleration.

[0036] The transmission structure is designed with 1st gear optimized for uphill and escape scenarios, providing strong power output; 2nd gear is suitable for daily driving, ensuring that the vehicle can run smoothly under various basic road conditions. This setting not only reduces the frequency of gear shifting during driving, but also significantly improves the safety and driving experience of the entire vehicle.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention.

Claims

1. A dual-motor drive assembly system, characterized in that: The invention comprises a power output source, wherein the power output source is arranged with an input unit opposite thereto so as to be connected to a reduction unit; the reduction unit transmits torque to a low-speed driving gear; a first composite gear shaft is arranged at the output end of the low-speed driving gear, and the first composite gear shaft and the low-speed driving gear are respectively meshed with a second composite gear shaft (11) for transmission; the second composite gear shaft (11) comprises two gears with different modules, an output shaft gear (12) is arranged at the output end of the second composite gear shaft (11), and the output shaft gear (12) is meshed with a pinion of the first composite gear shaft to complete torque output, thereby meeting the requirements of the whole vehicle.

2. The dual-motor drive assembly system according to claim 1, characterized in that: The power output source comprises a motor 1 and a motor 2 which are arranged opposite to each other, wherein the motor 1 and the motor 2 are respectively connected to an output shaft 1 (1) and an output shaft 2 (2) via splines; the output shaft 1 (1) and the output shaft 2 (2) are respectively meshed with a constant meshing gear 1 (3) and a constant meshing gear 2 (4).

3. The dual-motor drive assembly system according to claim 2, characterized in that: The constant meshing gear 1 (3) and the constant meshing gear 2 (4) are fixedly connected to the intermediate shaft 1 (5) and the intermediate shaft 2 (6) respectively.

4. The dual-motor drive assembly system according to claim 3, characterized in that: The intermediate shaft 1 (5) and the intermediate shaft 2 (6) are provided with gear sleeves which are combined with the low-speed driving gear 1 (7) and the low-speed driving gear 2 (8).

5. The dual-motor drive assembly system according to claim 4, characterized in that: The first composite gear shaft comprises a composite driving tooth 1 (9) and a composite driving tooth 2 (10), and the composite driving tooth 1 (9) and the composite driving tooth 2 (10) are arranged on a side of the gear sleeve away from the low-speed driving gear 1 (7) and the low-speed driving gear 2 (8).

6. The dual-motor drive assembly system according to claim 5, characterized in that: The second composite gear shaft (11) adopts a double-tooth process and comprises a low-speed driven gear and a high-speed driven gear.

7. The dual-motor drive assembly system according to claim 6, characterized in that: The low-speed driven gear is meshed with the low-speed driving gear, and the high-speed driven gear is meshed with the first composite gear shaft.

8. The dual-motor drive assembly system according to claim 7, characterized in that: The second composite gear shaft (11) adopts a suspended structure design, is supported by low-speed driving teeth on both sides and the first composite gear shaft, and has a rotation speed inconsistent with that of the output shaft.

9. A gear adjustment method for a dual-motor drive assembly system according to any one of claims 1 to 8, characterized in that: The power output source transmits power to the input shaft 1 (1) through a spline connection. The constant meshing gear 1 (3) is fixedly connected to the intermediate shaft 1 (5). When the gear sleeve is combined with the low-speed driving gear 1 (7), the torque is transmitted from the intermediate shaft 1 (5) to the low-speed driving gear 1 (7), and then transmitted to the second composite gear shaft (11), supported by the low-speed driving gears on both sides and the first composite gear shaft, and the rotation speed is inconsistent with that of the output shaft; the torque is transmitted to the composite gear shaft 1 (9) by the high-speed driven gear in the second composite gear shaft (11), and finally the composite gear shaft 1 (9) transmits the torque to the output shaft, and the power on both sides merges to complete the output of torque and rotation speed.

10. A gear adjustment method for a dual-motor drive assembly system according to any one of claims 1 to 8, characterized in that: When the gear sleeve is engaged with the compound gear shaft one (9), the torque is transmitted from the input shaft one (1) to the constant mesh gear one (3), the torque of the intermediate shaft one (5) is transmitted to the compound gear shaft one (9), and the compound gear shaft one (9) transmits the torque to the output shaft, so that the transmission route completes the secondary reduction.

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