Dual-motor drive transmission system and vehicle

Abstract

The utility model relates to a dual-motor drive transmission system and a vehicle, and the dual-motor drive transmission system comprises a dual-motor drive mechanism which comprises a first middle rotating shaft and a second middle rotating shaft which are parallel to each other and are arranged at an interval, a first motor in transmission connection with the first middle rotating shaft, and a second motor in transmission connection with the second middle rotating shaft; and the two-gear gear coupling mechanism comprises an output shaft, a first two-gear gear shifting mechanism connected between the first transfer shaft and the output shaft, and a second two-gear gear shifting mechanism connected between the second transfer shaft and the output shaft. According to the two-gear gear coupling mechanism, two independent power transmission paths are constructed, in the gear shifting process, switching between different power transmission paths is achieved through the first two-gear gear shifting mechanism and the second two-gear gear shifting mechanism, mutual power compensation of double motors in the alternate gear shifting process of the power transmission system can be achieved, and the power transmission efficiency is improved. The smoothness of a power transmission system is improved, the pause feeling in the driving process is reduced, and the driving comfort and safety are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle electric drive assembly technology, and in particular to a dual-motor drive transmission system and vehicle. Background Technology

[0002] Loader automatic transmissions based on traditional hydraulic torque converters employ multi-plate clutch shifting mechanisms, which are complex, costly, and prone to overheating and sintering damage. Furthermore, traditional loader transmissions use hydraulic shift control valves for external shifting mechanisms, which are complex, prone to hydraulic leakage and other sealing problems, and require high-quality materials and manufacturing processes. This also increases the difficulty of assembling and maintaining the powertrain system, leading to higher manufacturing and maintenance costs.

[0003] Electric loaders have been increasingly used in the market in recent years. Currently, the electric drive transmission system used in electric loaders mainly adopts a single motor two-speed mechanical shaft gear transmission structure. Compared with the complex transmission structure of traditional loaders, the electric transmission structure is optimized to a two-speed shift shaft gear structure, which greatly reduces shifting actions, reduces shifting time, reduces the labor intensity of the driver, improves efficiency, and reduces energy consumption.

[0004] However, single-motor two-speed electric transmissions cannot overcome the power interruption during gear shifting, and high-torque, low-speed motors are expensive and heavy. Therefore, there is an urgent need to develop an innovative transmission drive system suitable for electric loaders, to solve the power interruption during gear shifting in single-motor transmission systems, improve driving comfort and work efficiency, and ensure the simplicity and reliability of the transmission system. Summary of the Invention

[0005] This application provides a dual-motor drive transmission system and vehicle to solve the problems in the related art where single-motor two-speed electric transmissions cannot overcome the power interruption during gear shifting, and where high-torque low-speed motors are expensive and heavy.

[0006] The first aspect of this application provides a dual-motor drive transmission system, including:

[0007] A dual-motor drive mechanism includes a first and a second rotating shaft that are parallel to each other and spaced apart, a first motor that is drivenly connected to the first rotating shaft, and a second motor that is drivenly connected to the second rotating shaft.

[0008] A two-speed gear coupling mechanism includes an output shaft, a first two-speed gear shifting mechanism connected between the first intermediate shaft and the output shaft, and a second two-speed gear shifting mechanism connected between the second intermediate shaft and the output shaft.

[0009] In some embodiments: the first motor is connected to the first input shaft, and a first reduction gear coupling mechanism is connected between the first motor and the first intermediate shaft. The first reduction gear coupling mechanism includes a first active bias gear connected to the first input shaft.

[0010] And a first driven bias gear connected to the first central shaft, wherein the diameter of the first driving bias gear is smaller than the diameter of the first driven bias gear and they are meshed together.

[0011] In some embodiments: the second motor is connected to the second input shaft, and a second reduction gear coupling mechanism is connected between the second motor and the second intermediate shaft. The second reduction gear coupling mechanism includes a second active bias gear connected to the second input shaft.

[0012] And a second driven bias gear connected to the second central shaft, wherein the diameter of the second driving bias gear is smaller than the diameter of the second driven bias gear and they are meshed together.

[0013] In some embodiments: the first two-speed gear shifting mechanism includes a first intermediate input gear and a second intermediate input gear loosely fitted on the first intermediate shaft, and a first output gear and a second output gear fixed on the output shaft;

[0014] The first transfer input gear is meshed with the first output gear, and the second transfer input gear is meshed with the second output gear;

[0015] The first transfer shaft is provided with a first shifting mechanism, which is used to engage or disengage the first transfer input gear or the second transfer input gear from the first transfer shaft.

[0016] In some embodiments: the first shifting mechanism is fixed on the first transfer shaft and located between the first transfer input gear and the second transfer input gear, wherein the diameter of the first transfer input gear is smaller than the diameter of the second transfer input gear, and the diameter of the first output gear is larger than the diameter of the second output gear.

[0017] In some embodiments: the second two-speed gear shifting mechanism includes a third and a fourth intermediate input gear loosely fitted on the second intermediate shaft, and a first and a second output gear fixed on the output shaft;

[0018] The third transfer input gear is meshed with the first output gear, and the fourth transfer input gear is meshed with the second output gear;

[0019] The second transfer shaft is provided with a second shifting mechanism, which is used to engage or disengage the third or fourth transfer input gear from the second transfer shaft.

[0020] In some embodiments: the second shifting mechanism is fixed on the second transfer shaft and located between the third transfer input gear and the fourth transfer input gear, wherein the diameter of the third transfer input gear is smaller than the diameter of the fourth transfer input gear, and the diameter of the first output gear is larger than the diameter of the second output gear.

[0021] In some embodiments, both the first shifting mechanism and the second shifting mechanism are canine clutches.

[0022] In some embodiments: the output shaft is connected to the drive axle via a transmission shaft, and the drive axle is provided with a differential connected to the transmission shaft.

[0023] A second aspect of this application provides a vehicle that includes the dual-motor drive transmission system described in any of the above embodiments.

[0024] The beneficial effects of the technical solution provided in this application include:

[0025] This application provides a dual-motor drive transmission system and a vehicle. The dual-motor drive transmission system of this application is provided with a dual-motor drive mechanism, which includes a first and a second rotating shaft that are parallel to each other and spaced apart, a first motor that is drivenly connected to the first rotating shaft, and a second motor that is drivenly connected to the second rotating shaft; a two-speed gear coupling mechanism, which includes an output shaft, a first two-speed gear shifting mechanism connected between the first rotating shaft and the output shaft, and a second two-speed gear shifting mechanism connected between the second rotating shaft and the output shaft.

[0026] Therefore, the dual-motor drive transmission system of this application is equipped with a first two-speed gear shifting mechanism and a second two-speed gear shifting mechanism, which can realize dual-motor or single-motor drive modes for the first motor and the second motor. The two-speed gear coupling mechanism constructs two independent power transmission paths. During gear shifting, the first two-speed gear shifting mechanism and the second two-speed gear shifting mechanism are used to switch between different power transmission paths. This enables mutual power compensation between the two motors during the gear shifting process in the power transmission system, improves the smoothness of the power transmission system, reduces jerking during driving, and enhances driving comfort and safety. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural diagram of the dual-motor drive transmission system according to an embodiment of this application.

[0029] Figure label:

[0030] 1. First motor; 2. Second motor; 3. First shifting mechanism; 4. Second shifting mechanism; 10. First input shaft; 11. First driving bias gear; 20. Second input shaft; 21. Second driving bias gear; 30. First intermediate shaft; 31. First intermediate input gear; 32. Second intermediate input gear; 33. First driven bias gear; 40. Second intermediate shaft; 41. Third intermediate input gear; 42. Fourth intermediate input gear; 43. Second driven bias gear; 50. Output shaft; 51. First output gear; 52. Second output gear; 100. First two-speed gear shifting mechanism; 200. Second two-speed gear shifting mechanism. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] This application provides a dual-motor drive transmission system and vehicle, which can solve the problems that a single-motor two-speed electric transmission cannot overcome the power interruption during gear shifting, and that high-torque low-speed motors are expensive and heavy.

[0033] See Figure 1 As shown, the first aspect of this application provides a dual-motor drive transmission system, including:

[0034] The dual-motor drive mechanism includes a first rotating shaft 30 and a second rotating shaft 40 that are parallel to each other and spaced apart, a first motor 1 that is driven by the first rotating shaft 30, and a second motor 2 that is driven by the second rotating shaft 40. Both the first motor 1 and the second motor 2 are preferably, but not limited to, permanent magnet synchronous motors.

[0035] A two-speed gear coupling mechanism includes an output shaft 50, a first two-speed gear shifting mechanism 100 connecting a first intermediate shaft 30 and the output shaft 50, and a second two-speed gear shifting mechanism 200 connecting a second intermediate shaft 40 and the output shaft 50. The output shaft 50 is connected to the drive axle via a drive shaft, and the drive axle is equipped with a differential connected to the drive shaft.

[0036] The driving force of the first motor 1 and the second motor 2 is applied to the first intermediate shaft 30 and the second intermediate shaft 40 respectively. The first intermediate shaft 30 and the second intermediate shaft 40 can be selectively linked with the first two-speed gear shifting mechanism 100 or the second two-speed gear shifting mechanism 200 respectively, so as to realize the independent two-speed transmission of the power input of the first motor 1 and the second motor 2. The linked power is finally output to the outside through the output shaft 50.

[0037] In related technologies, single-motor two-speed AMT transmission systems used in electric loaders suffer from power interruption during gear shifts. Although the two-speed AMT transmission structure is simple, the use of a low-speed, high-torque motor results in a bulky and costly overall transmission system. Furthermore, loader AT transmissions based on traditional hydraulic torque converters employ multi-plate clutch shifting mechanisms, leading to complex mechanical structures and high assembly costs. Against this backdrop, the development of a more cost-effective dual-motor drive transmission system is needed, applicable to electric loaders, to improve shift smoothness and transmission system efficiency.

[0038] In this embodiment, the power input of the first motor 1 and the second motor 2 is respectively via the first central shaft 30 and the second central shaft 40. Through the dual-motor bias arrangement, the single-path power input of the single motor is improved to the parallel bias dual power input of the dual motors, thereby greatly reducing the torque requirement of the dual motors and making the dual-motor assembly lighter and cheaper.

[0039] Furthermore, the dual motors can utilize the independent two-speed transmission mechanical structures formed by the first two-speed gear shifting mechanism 100 and the second two-speed gear shifting mechanism 200 to achieve independent and efficient drive of a single motor to meet the low-load power requirements of the loader, while the dual motors can jointly provide drive output to meet the heavy-load drive requirements of the loader. By utilizing the independent two-speed mechanical transmission paths of the dual motors, the alternating shifting power compensation of the dual motors can be achieved, improving driving comfort and shifting safety.

[0040] In some alternative embodiments: see Figure 1As shown in the figure, this application provides a dual-motor drive transmission system. A first reduction gear coupling mechanism connects the first motor 1 to the first intermediate shaft 30. The first motor 1 is connected to the first input shaft 10. The first reduction gear coupling mechanism includes a first active bias gear 11 connected to the first input shaft 10 and a first driven bias gear 33 connected to the first intermediate shaft 30. The diameter of the first active bias gear 11 is smaller than the diameter of the first driven bias gear 33, and they are meshed together.

[0041] In this embodiment of the application, the first input shaft 10 of the first motor 1 and the first intermediate shaft 30 are connected by a first driving bias gear 11 and a first driven bias gear 33 meshing with each other, and the diameter of the first driving bias gear 11 is smaller than the diameter of the first driven bias gear 33. The meshing of the first driving bias gear 11 and the first driven bias gear 33 reduces speed and increases torque, which can effectively reduce the torque requirement of the first motor 1, significantly reduce the cost and weight of the first motor 1, and solve the spatial structure problem of dual-motor arrangement.

[0042] In some alternative embodiments: see Figure 1 As shown in the figure, this application provides a dual-motor drive transmission system. A second reduction gear coupling mechanism connects the second motor 2 to the second intermediate shaft 40. The second motor 2 is connected to the second input shaft 20. The second reduction gear coupling mechanism includes a second active bias gear 21 connected to the second input shaft 20 and a second driven bias gear 43 connected to the second intermediate shaft 40. The diameter of the second active bias gear 21 is smaller than the diameter of the second driven bias gear 43, and they are meshed together.

[0043] In this embodiment of the application, the second input shaft 20 of the second motor 2 and the second intermediate shaft 40 are connected by a second driving bias gear 21 and a second driven bias gear 43 meshing with each other, and the diameter of the second driving bias gear 21 is smaller than the diameter of the second driven bias gear 43. The meshing of the second driving bias gear 21 and the second driven bias gear 43 reduces speed and increases torque, which can effectively reduce the torque requirement of the second motor 2, significantly reduce the cost and weight of the second motor 2, and solve the spatial structure problem of dual-motor arrangement.

[0044] In some alternative embodiments: see Figure 1 As shown, this application embodiment provides a dual-motor drive transmission system. The first two-speed gear shifting mechanism 100 of the dual-motor drive transmission system includes a first intermediate input gear 31 and a second intermediate input gear 32 loosely fitted on the first intermediate shaft 30, and a first output gear 51 and a second output gear 52 fixed on the output shaft 50.

[0045] The first intermediate input gear 31 is meshed with the first output gear 51, and the second intermediate input gear 32 is meshed with the second output gear 52. The first intermediate shaft 30 is provided with a first shifting mechanism 3, which is used to engage or disengage the first intermediate input gear 31 or the second intermediate input gear 32 from the first intermediate shaft 30.

[0046] The first shifting mechanism 3 is fixed on the first transfer shaft 30 and located between the first transfer input gear 31 and the second transfer input gear 32. The diameter of the first transfer input gear 31 is smaller than the diameter of the second transfer input gear 32, and the diameter of the first output gear 51 is larger than the diameter of the second output gear 52.

[0047] The first two-speed gear shifting mechanism 100 of this application embodiment utilizes the meshing connection of the first intermediate input gear 31 and the first output gear 51 to form a low-speed gear, and the meshing connection of the second intermediate input gear 32 and the second output gear 52 to form a high-speed gear. The first shifting mechanism 3 located between the first intermediate input gear 31 and the second intermediate input gear 32 realizes free switching between low-speed gears and high-speed gears by respectively engaging or disengaging the first intermediate input gear 31 or the second intermediate input gear 32.

[0048] While the first shifting mechanism 3 is freely switching between low-speed and high-speed gears by engaging or disengaging the first intermediate input gear 31 or the second intermediate input gear 32, the second two-speed gear shifting mechanism 200 continuously transmits the power output from the second motor 2 to the output shaft 50 and performs power compensation, thereby maintaining smooth shifting control without power interruption and improving driving comfort and safety.

[0049] In some alternative embodiments: see Figure 1 As shown, this application embodiment provides a dual-motor drive transmission system. The second two-speed gear shifting mechanism 200 of the dual-motor drive transmission system includes a third intermediate input gear 41 and a fourth intermediate input gear 42 loosely fitted on the second intermediate shaft 40, and a first output gear 51 and a second output gear 52 fixed on the output shaft 50.

[0050] The third intermediate input gear 41 is meshed with the first output gear 51, and the fourth intermediate input gear 42 is meshed with the second output gear 52. A second shifting mechanism 4 is provided on the second intermediate shaft 40, which is used to engage or disengage the third intermediate input gear 41 or the fourth intermediate input gear 42 from the second intermediate shaft 40.

[0051] The second shifting mechanism 4 is fixed on the second intermediate shaft 40 and located between the third intermediate input gear 41 and the fourth intermediate input gear 42. The diameter of the third intermediate input gear 41 is smaller than the diameter of the fourth intermediate input gear 42, and the diameter of the first output gear 51 is larger than the diameter of the second output gear 52. Both the first shifting mechanism 3 and the second shifting mechanism 4 are preferably, but not limited to, dog clutches.

[0052] The second two-speed gear shifting mechanism 200 of this application embodiment utilizes a third intermediate input gear 41 meshing with a first output gear 51 to form a low-speed gear, and a fourth intermediate input gear 42 meshing with a second output gear 52 to form a high-speed gear. The second shifting mechanism 4 located between the third intermediate input gear 41 and the fourth intermediate input gear 42 achieves free switching between low-speed and high-speed gears by engaging or disengaging the third intermediate input gear 41 or the fourth intermediate input gear 42 respectively.

[0053] While the second shifting mechanism 4 is freely switching between low-speed and high-speed gears by engaging or disengaging the third intermediate input gear 41 or the fourth intermediate input gear 42, the first two-speed gear shifting mechanism 100 continuously transmits the power output from the first motor 1 to the output shaft 50 and performs power compensation, thereby maintaining smooth shifting control without power interruption and improving driving comfort and safety.

[0054] The second aspect of this application provides a vehicle that includes the dual-motor drive transmission system described in any of the above embodiments. The vehicle may be a loader, a sweeper, a water sprinkler, etc.

[0055] Working principle

[0056] This application provides a dual-motor drive transmission system and a vehicle. The dual-motor drive transmission system of this application is provided with a dual-motor drive mechanism, which includes a first central shaft 30 and a second central shaft 40 that are parallel to each other and spaced apart, a first motor 1 that is drivenly connected to the first central shaft 30, and a second motor 2 that is drivenly connected to the second central shaft 40; a two-speed gear coupling mechanism, which includes an output shaft 50, a first two-speed gear shifting mechanism 100 connected between the first central shaft 30 and the output shaft 50, and a second two-speed gear shifting mechanism 200 connected between the second central shaft 40 and the output shaft 50.

[0057] Therefore, the dual-motor drive transmission system of this application is equipped with a first two-speed gear shifting mechanism 100 and a second two-speed gear shifting mechanism 200, which can realize dual-motor or single-motor drive modes of the first motor 1 and the second motor 2. The two-speed gear coupling mechanism constructs two independent power transmission paths. During the shifting process, the first two-speed gear shifting mechanism 100 and the second two-speed gear shifting mechanism 200 are used to switch between different power transmission paths. This enables mutual power compensation between the two motors during the shifting process in the power transmission system, improves the smoothness of the power transmission system, reduces jerking during driving, and enhances driving comfort and safety.

[0058] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A dual-motor drive transmission system, characterized by, The double-motor drive mechanism comprises a first intermediate shaft (30) and a second intermediate shaft (40) arranged in parallel and spaced apart, a first motor (1) in driving connection with the first intermediate shaft (30), and a second motor (2) in driving connection with the second intermediate shaft (40). The two-gear gear coupling mechanism comprises an output shaft (50), a first two-gear gear shifting mechanism (100) connected between the first intermediate shaft (30) and the output shaft (50), and a second two-gear gear shifting mechanism (200) connected between the second intermediate shaft (40) and the output shaft (50).

2. The double-motor drive transmission system according to claim 1, wherein: the first motor (1) is connected with a first input shaft (10), and a first reduction gear coupling mechanism is connected between the first motor (1) and the first intermediate shaft (30), the first reduction gear coupling mechanism comprising a first driving offset gear (11) connected with the first input shaft (10), and a first driven offset gear (33) connected with the first intermediate shaft (30), the diameter of the first driving offset gear (11) being smaller than that of the first driven offset gear (33) and being in meshing connection with each other.

3. The double-motor drive transmission system according to claim 1, wherein: the second motor (2) is connected with a second input shaft (20), and a second reduction gear coupling mechanism is connected between the second motor (2) and the second intermediate shaft (40), the second reduction gear coupling mechanism comprising a second driving offset gear (21) connected with the second input shaft (20), and a second driven offset gear (43) connected with the second intermediate shaft (40), the diameter of the second driving offset gear (21) being smaller than that of the second driven offset gear (43) and being in meshing connection with each other.

4. The double-motor drive transmission system according to claim 1, wherein: the first two-gear gear shifting mechanism (100) comprises a first intermediate input gear (31) and a second intermediate input gear (32) sleeved on the first intermediate shaft (30), and a first output gear (51) and a second output gear (52) fixed on the output shaft (50); the first intermediate input gear (31) is in meshing connection with the first output gear (51), and the second intermediate input gear (32) is in meshing connection with the second output gear (52); a first shifting mechanism (3) is arranged on the first intermediate shaft (30), and the first shifting mechanism (3) is used for combining or separating the first intermediate input gear (31) or the second intermediate input gear (32) with the first intermediate shaft (30).

5. The double-motor drive transmission system according to claim 4, wherein: ​ ​ ​ The first shift mechanism (3) is fixed on the first intermediate shaft (30) and located between the first intermediate input gear (31) and the second intermediate input gear (32), the diameter of the first intermediate input gear (31) is smaller than that of the second intermediate input gear (32), and the diameter of the first output gear (51) is greater than that of the second output gear (52).

6. The dual-motor drive transmission system of claim 4, wherein: The second two-gear shift mechanism (200) comprises a third intermediate input gear (41) and a fourth intermediate input gear (42) sleeved on the second intermediate shaft (40), and the first output gear (51) and the second output gear (52) fixed on the output shaft (50); The third intermediate input gear (41) is in meshing connection with the first output gear (51), and the fourth intermediate input gear (42) is in meshing connection with the second output gear (52); The second intermediate shaft (40) is provided with a second shift mechanism (4), and the second shift mechanism (4) is used for combining or separating the third intermediate input gear (41) or the fourth intermediate input gear (42) with the second intermediate shaft (40).

7. The dual-motor drive transmission system of claim 6, wherein: The second shift mechanism (4) is fixed on the second intermediate shaft (40) and located between the third intermediate input gear (41) and the fourth intermediate input gear (42), the diameter of the third intermediate input gear (41) is smaller than that of the fourth intermediate input gear (42), and the diameter of the first output gear (51) is greater than that of the second output gear (52).

8. The dual-motor drive transmission system of claim 6, wherein: The first shift mechanism (3) and the second shift mechanism (4) are both dog clutches.

9. The dual-motor drive transmission system of claim 1, wherein: The output shaft (50) is connected with a drive axle through a transmission shaft, and a differential is arranged in the drive axle and connected with the transmission shaft.

10. A vehicle characterized by comprising: The vehicle comprises the dual-motor drive transmission system according to any one of claims 1 to 9.

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