e-bridge drive system

Abstract

The present invention provides an electric axle drive system comprising multiple motors, two output half-shafts, and a central shaft. A first transmission mechanism is provided between each motor and the central shaft, and a second transmission mechanism is provided between the central shaft and the differential. Each first transmission mechanism comprises a first intermediate shaft, a first shifting device, and a first gear transmission unit and a second gear transmission unit, wherein the first shifting device can be selectively connected to the central shaft via either the first gear transmission unit or the second gear transmission unit. The second transmission mechanism comprises a second shifting device, one side of which is connected to the differential via a third gear transmission unit, and the other side of which is connected to the differential via a fourth gear transmission unit, or directly connected to the differential. The electric axle drive system of the present invention facilitates gear adjustment and output of different torques, and also helps improve the reliability of the electric axle drive system during use.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, and in particular to an electric bridge drive system. Background Art

[0002] With the country's increasing demands for energy conservation and environmental protection, and with people's growing environmental awareness, electric vehicles are gaining popularity and becoming a primary means of transportation for daily commutes. However, most electric vehicles currently utilize a single motor and a fixed reduction ratio drive system with multiple gears, resulting in a complex overall structure. This not only results in large dimensions and is unfavorable for overall vehicle layout, but also renders the vehicle inoperable if the motor fails, seriously impacting its reliability. Summary of the Invention

[0003] In view of this, the present invention aims to provide an electric bridge drive system to improve the shifting effect of the drive system and have better reliability.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] An electric bridge drive system includes a plurality of motors, two output half-shafts connected by a differential, and a central shaft sleeved on one of the output half-shafts, wherein:

[0006] A first transmission mechanism is provided between each of the motors and the central shaft, and a second transmission mechanism is provided between the central shaft and the differential. Each of the first transmission mechanisms comprises a first intermediate shaft drivingly connected to the motor, a first shifting device sleeved on the first intermediate shaft, and a first gear transmission unit and a second gear transmission unit with different transmission ratios provided between the first shifting device and the central shaft. The first shifting device can be selectively connected to the central shaft through either the first gear transmission unit or the second gear transmission unit.

[0007] The second transmission mechanism has a second shifting device sleeved on the central shaft, one side of the second shifting device is connected to the differential through a third gear transmission unit, the other side of the second shifting device is connected to the differential through a fourth gear transmission unit, or the other side of the second shifting device is directly connected to the differential, and the transmission ratios of the third gear transmission unit and the fourth gear transmission unit are different.

[0008] Furthermore, the first gear transmission unit includes a first driving gear arranged on one side of the first shifting device, and a first driven gear arranged on the central shaft and meshing with the first driving gear; the second gear transmission unit includes a second driving gear arranged on the other side of the first shifting device, and a second driven gear arranged on the central shaft and meshing with the second driving gear; each of the first gear transmission units shares one first driven gear, and / or each of the second gear transmission units shares one second driven gear.

[0009] Furthermore, a plurality of second intermediate shafts are provided on one side of the central shaft, and the plurality of second intermediate shafts are connected to the differential drive through a second transmission gear set; the third gear transmission unit and the fourth gear transmission unit are both connected to the differential drive through a plurality of second intermediate shafts.

[0010] Furthermore, the third gear transmission unit includes a third driving gear arranged on one side of the second shifting device, and a third driven gear arranged on each second intermediate shaft and engaged with the third driving gear; the fourth gear transmission unit includes a fourth driving gear arranged on the other side of the second shifting device, and a fourth driven gear arranged on each second intermediate shaft and engaged with the fourth driving gear.

[0011] Furthermore, the second transmission gear set includes a sixth driven gear connected to the differential, and a sixth driving gear respectively provided on each of the second intermediate shafts, and each of the sixth driving gears is meshed with the sixth driven gear.

[0012] Furthermore, the motor is coaxially arranged with the first intermediate shaft and connected to one end of the first intermediate shaft; or, the motor is connected to the first intermediate shaft through a first transmission gear set and is offset to one side of the first intermediate shaft.

[0013] Furthermore, the radial distances between the second intermediate shaft and the first intermediate shaft and the central shaft are the same or different, the differential is arranged at one end of the electric bridge drive system, and each of the motors is arranged at the other end of the electric bridge drive system relative to the differential.

[0014] Furthermore, the motor is connected to the first intermediate shaft through a first transmission gear set, and is offset on one side of the first intermediate shaft; the second intermediate shaft and the first intermediate shaft are arranged in parallel and staggered on the radial outside of the central shaft, and the motor and the second intermediate shaft are arranged in parallel and staggered on the radial outside of the central shaft, and the motor is arranged close to the differential.

[0015] Furthermore, each of the two output half shafts is provided with a planetary gear reduction mechanism, and each of the output half shafts is connected to the wheel transmission through the planetary gear reduction mechanism.

[0016] Furthermore, the first transmission gear set includes a fifth driving gear provided on the motor, and a fifth driven gear provided on the first intermediate shaft and meshing with the fifth driving gear, and the outer diameter of the fifth driving gear is smaller than that of the fifth driven gear.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] In the electric axle drive system described in the present invention, the first shifting device can be selectively connected to the central shaft through the first gear transmission unit or the second gear transmission unit, one side of the second shifting device is connected to the differential through the third gear transmission unit, the other side of the second shifting device is connected to the differential through the fourth gear transmission unit, or the other side of the second shifting device is directly connected to the differential, which can facilitate the adjustment of the gear position and output different torques. At the same time, through the arrangement of multiple motors and central shafts, the reliability and stability of the electric axle drive system in use can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of a first structural example of the electric bridge drive system according to the first embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the second structure of the electric bridge drive system according to the first embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a third structure of the electric bridge drive system according to the first embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a fourth structure of the electric bridge drive system according to the first embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the first structure of the electric bridge drive system according to the second embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a second structure of the electric bridge drive system according to the second embodiment of the present invention;

[0026] Figure 7This is a schematic diagram of a third structure of the electric bridge drive system according to the second embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of a fourth structure of the electric bridge drive system according to the second embodiment of the present invention;

[0028] Description of reference numerals:

[0029] 1. First motor; 2. Second motor; 3. First shifting device; 4. Second shifting device;

[0030] 10. First motor output shaft; 11. Fifth driving gear; 12. Fifth driven gear; 13. Second motor output shaft;

[0031] 30. First intermediate shaft; 31. First driving gear; 32. Second driving gear;

[0032] 40. Central shaft; 41. First driven gear; 42. Second driven gear;

[0033] 50. Second intermediate shaft; 51. Third driving gear; 52. Fourth driving gear; 54. Sixth driving gear; 55. Third driven gear; 56. Fourth driven gear;

[0034] 60. Output half shaft; 62. Differential; 64. Sixth driven gear;

[0035] 70. Planetary gear reduction mechanism. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0037] In the description of the present invention, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, if terms such as "first" through "sixth" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0038] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in the present invention based on the specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Example 1

[0041] This embodiment relates to an electric bridge drive system, which includes multiple motors, two output half-shafts 60 connected by a differential 62, and a central shaft 40 sleeved on one of the output half-shafts 60. A first transmission mechanism is provided between each motor and the central shaft 40, and a second transmission mechanism is provided between the central shaft 40 and the differential 62.

[0042] like Figure 1 As shown in FIG, as a preferred embodiment, this embodiment specifically illustrates the structure of the electric bridge drive system using two motors as an example. Each first transmission mechanism comprises a first intermediate shaft 30 drivingly connected to the motor, a first shifting device 3 sleeved on the first intermediate shaft 30, and first and second gear transmission units with different transmission ratios disposed between the first shifting device 3 and the central shaft 40. Furthermore, the first shifting device 3 can be selectively connected to the central shaft 40 via either the first gear transmission unit or the second gear transmission unit.

[0043] For the convenience of description below, in this embodiment, Figure 1 The orientation shown is the reference. Figure 1 The upper motor is called the first motor 1, and the lower motor is called the second motor 2. Meanwhile, as a preferred embodiment, the two first intermediate shafts 30, and the first motor 1 and the second motor 2 are all arranged symmetrically with the central axis 40 as the center.

[0044] Still refer to Figure 1 As shown in , in a specific implementation, each motor can be coaxially arranged with the first intermediate shaft 30 and connected to one end of the first intermediate shaft 30. Specifically, the first intermediate shaft 30, located on the same side as the first motor 1, and the first motor output shaft 10 of the first motor 1 are coaxially arranged, while the first intermediate shaft 30, located on the same side as the second motor 2, and the second motor output shaft 13 of the second motor 2 are coaxially arranged. In this case, the electric axle drive system with this structure is suitable for medium-sized commercial vehicles with low wheel-side torque load requirements.

[0045] Of course, except for Figure 1 The motor shown in FIG is coaxially arranged with the first intermediate shaft 30, as shown in FIG. Figure 2 As shown, the motor in this embodiment can also be connected to the first intermediate shaft 30 through the first transmission gear set and offset to one side of the first intermediate shaft 30. Figure 2 The electric axle drive system of the structure shown has higher reliability and enhanced load-bearing capacity, and is suitable for heavy-duty commercial vehicles.

[0046] In order to facilitate the distinction of description, in this embodiment, Figure 1 The bridge drive system in the example is called the first structure, and the Figure 2 As shown, the electric bridge drive system with the first transmission gear set added based on the first structure is called the second structure.

[0047] Regarding the specific structure, still refer to Figure 2 As shown in the second structure, the first transmission gear set includes a fifth driving gear 11 provided on the motor, and a fifth driven gear 12 provided on the first intermediate shaft 30 and meshing with the fifth driving gear 11. The first motor 1 and the second motor 2 both drive the fifth driving gear 11 to rotate, thereby driving the fifth driven gear 12 to transmit power, thereby driving the first intermediate shaft 30 on the same side to rotate.

[0048] Still referring to Figure 1 As shown in FIG, in the electric axle drive system of this embodiment, the first gear transmission unit includes a first driving gear 31 provided on one side of the first shifting device 3, and a first driven gear 41 provided on the central shaft 40 and meshing with the first driving gear 31. The second gear transmission unit includes a second driving gear 32 provided on the other side of the first shifting device 3, and a second driven gear 42 provided on the central shaft 40 and meshing with the second driving gear 32.

[0049] The first shifting device 3 in this embodiment can be a two-way synchronizer or a dog clutch in the prior art, which are mature products and facilitate the connection of the first shifting device 3 to the central shaft 40 via the first gear transmission unit or the second gear transmission unit. The different transmission ratios of the first gear transmission unit and the second gear transmission unit facilitate the adjustment of two different gear positions.

[0050] As a preferred embodiment, still refer to Figure 1 As shown in FIG, the two first gear transmission units share a first driven gear 41, and the two second gear transmission units share a second driven gear 42. This arrangement improves the integration of the entire electric bridge drive system, reduces production costs, and reduces the space occupied in the vehicle.

[0051] It is understandable that in this embodiment, it is also possible to make only the two first gear transmission units share a first driven gear 41, or only the two second gear transmission units share a second driven gear 42. In this case, a better use effect can also be achieved. However, compared with the solution of sharing the first driven gear 41 and the second driven gear 42 at the same time, there is no advantage in space occupation and cost. In addition, it is also possible to make each first gear transmission unit include a separately provided first driving gear 31 and a first driven gear 41, and to make each second gear transmission unit include a separately provided second driving gear 32 and a second driven gear 42, but it will take up more axial space.

[0052] The second transmission mechanism in this embodiment has a second shifting device 4 sleeved on the central shaft 40. The second shifting device 4 also adopts a two-way synchronizer or dog clutch in the prior art, which is a mature product with good performance. Figure 1 One side of the second shifting device 4 is connected to the differential 62 via the third gear transmission unit, while the other side of the second shifting device 4 is connected to the differential 62 via the fourth gear transmission unit. The third and fourth gear transmission units have different transmission ratios. This arrangement facilitates changing the torque transmitted to the differential 62, thereby changing the output gear.

[0053] In the electric axle drive system of this embodiment, the first shifting device 3 can be selectively connected to the central shaft 40 via the first gear transmission unit or the second gear transmission unit, and the second shifting device 4 can also be selectively connected to the differential 62 via the third gear transmission unit or the fourth gear transmission unit. In this way, the gear position can be adjusted to output different torques.

[0054] Based on the above overall introduction, still refer to Figure 1 Taking the first structure as an example, multiple second intermediate shafts 50 are provided on one side of the central shaft 40. Each second intermediate shaft 50 is drivingly connected to the differential 62 via a second transmission gear set. The third and fourth gear transmission units are drivingly connected to the differential 62 via the multiple second intermediate shafts 50.

[0055] As an exemplary structure, the third gear transmission unit includes a third driving gear 51 disposed on one side of the second shifting device 4, and a third driven gear 55 disposed on each second intermediate shaft 50 and meshing with the third driving gear 51. The fourth gear transmission unit includes a fourth driving gear 52 disposed on the other side of the second shifting device 4, and a fourth driven gear 56 disposed on each second intermediate shaft 50 and meshing with the fourth driving gear 52.

[0056] The second transmission gear set specifically includes a sixth driven gear 64 connected to the differential 62, and a sixth driving gear 54 provided on each second intermediate shaft 50. Each sixth driving gear 54 meshes with the sixth driven gear 64. This arrangement facilitates further adjustment of the torque transmitted to the differential 62.

[0057] In this embodiment, as a preferred implementation, two second intermediate shafts 50 are also provided, located on either side of the central shaft 40. The two second intermediate shafts 50 are symmetrically arranged on opposite sides of the central shaft 40, and each second intermediate shaft 50 corresponds one-to-one with the first intermediate shafts 30 in the two first transmission mechanisms. This further improves the reliability of the electric bridge drive system during use.

[0058] It should be noted that, in addition to adopting the arrangement of the first structure or the second structure, the second shifting device 4 in this embodiment can also be arranged as follows: Figure 3 , is applied to the third configuration. In this third configuration, one side of the second shifting device 4 is similarly connected to the differential 62 via the third gear transmission unit, while the other side of the second shifting device 4 is directly connected to the differential 62. Furthermore, in this third configuration, the motor and first intermediate shaft 30 are also coaxially arranged. This electric axle drive system is suitable for medium-sized commercial vehicles with low wheel-side torque load requirements.

[0059] Based on the third structure, the first transmission gear set can be added between the motor and the first intermediate shaft 30 as in the second structure, so that the motor is offset. Figure 4 The fourth structure shown in FIG. At this time, the fourth structure has an enhanced load-bearing capacity and is suitable for heavy-duty and medium-duty commercial vehicles.

[0060] In the electric bridge drive system of this embodiment, the transmission paths of the motors in different gears are basically the same when in use. Figure 1 , and the first structure is still used as an example for description. The transmission path of the first motor 1 when in use is as follows:

[0061] When the first motor 1 is in first gear, it drives the first intermediate shaft 30 on the same side of the transmission via the first motor output shaft 10. The first shifting device 3 transmits torque to the central shaft 40 through the cooperation of the first driving gear 31 and the first driven gear 41. The second shifting device 4 then transmits torque to the second intermediate shaft 50 on the same side through the cooperation of the third driving gear 51 and the third driven gear 55. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the sixth driving gear 54 and the sixth driven gear 64. The torque is then transmitted to both ends of the output half shaft 60 via the differential 62.

[0062] When the first motor 1 is in the second gear, it is driven by the first motor 1, via the first motor output shaft 10, to rotate the first intermediate shaft 30 on the same side. The first shifting device 3 transmits torque to the center shaft 40 through the cooperation of the second driving gear 32 and the second driven gear 42. The second shifting device 4 then transmits torque to the second intermediate shaft 50 on the same side through the cooperation of the third driving gear 51 and the third driven gear 55. The second intermediate shaft 50 transmits torque to the differential 62 through the cooperation of the sixth driving gear 54 and the sixth driven gear 64. The torque is then transmitted to both ends of the output half shaft 60 via the differential 62.

[0063] When the first motor 1 is in the third gear, driven by the first motor 1, the first intermediate shaft 30 on the same side is driven to rotate through the first motor output shaft 10 of the first motor 1, and the first gear shifting device 3 transmits the torque to the central shaft 40 through the cooperation of the first driving gear 31 and the first driven gear 41. Then the second gear shifting device 4 transmits the torque to the second intermediate shaft 50 through the cooperation of the fourth driving gear 52 and the fourth driven gear 56, and transmits it to the differential 62 through the sixth driving gear 54 and the sixth driven gear 64. At the same time, the other side of the second gear shifting device 4 is directly connected to the differential 62, and transmits the torque to the two ends of the output half shaft 60 through the differential 62.

[0064] When the first motor 1 is in the fourth gear, driven by the first motor 1, the first intermediate shaft 30 on the same side is driven to rotate through the first motor output shaft 10 of the first motor 1, and the first gear shifting device 3 transmits the torque to the central shaft 40 through the cooperation of the second driving gear 32 and the second driven gear 42. Then the second gear shifting device 4 transmits the torque to the second intermediate shaft 50 through the cooperation of the fourth driving gear 52 and the fourth driven gear 56, and transmits it to the differential 62 through the sixth driving gear 54 and the sixth driven gear 64. At the same time, the other side of the second gear shifting device 4 is directly connected to the differential 62, and transmits the torque to the two ends of the output half shaft 60 through the differential 62.

[0065] It should be noted that when the bridge drive system adopts Figure 3 The third structure shown in , or Figure 4 In the fourth configuration shown, the transmission paths for the first and second gears when the first motor 1 is in use are identical to those described above. The third and fourth gears differ only in that the central shaft 40 is directly connected to the differential 62 via the second shifting device 4.

[0066] In the electric bridge drive system of this embodiment, the specifications of the motor can be as small as possible while meeting the usage requirements, which is conducive to reducing the production cost of the electric bridge drive system and reducing the space occupied in the vehicle.

[0067] In this embodiment, the first motor 1 and the second motor 2 each have first to fourth gears and a neutral gear when in use. In specific use, the first motor 1 and the second motor 2 can operate synchronously, or only the first motor 1 or the second motor 2 can operate. When the two motors operate synchronously, the specific gear combinations of the first motor 1 and the second motor 2 in this embodiment are as follows:

[0068] When the first motor 1 is in the first gear and the second gear, the second motor 2 can switch between the first gear, the second gear, or the neutral gear. When the first motor 1 is in the third gear and the fourth gear, the second motor 2 can switch between the third gear, the fourth gear, or the neutral gear.

[0069] When the second motor 2 is in a different gear, the gear that the first motor 1 can adjust is aligned with the corresponding gear of the first motor 1 and the second motor 2. In this embodiment, by providing dual motors, a shift operation can be performed on one motor while the other is in the current gear, thereby enabling uninterrupted shifting, improving shifting smoothness and stability during use.

[0070] In this embodiment, it should be noted that, in addition to the two motors described above, three, four, or more motors may be arranged circumferentially along the central axis 40. Using three or more motors allows the entire electric drive system to have more adjustable gears and greater adaptability.

[0071] Of course, in specific implementations, the number of motors can be selected based on usage requirements, as long as the usage requirements are met. Furthermore, preferably, when there are more than two motors, each first gear transmission unit can still share a first driven gear 41, and each second gear transmission unit can still share a second driven gear 42, thereby achieving transmission connection between the first gear transmission unit and the second gear transmission unit and the central shaft 40.

[0072] Of course, it is also feasible to have each first gear transmission unit individually connected to the central shaft 40 via a first driven gear 41, and each second gear transmission unit individually connected to the central shaft 40 via a second driven gear 42. However, this solution requires more space for arrangement and is more expensive to produce.

[0073] In addition, it should be noted that in this embodiment, in addition to making the radial distances between the second intermediate shaft 50 and the first intermediate shaft 30 and the central axis 40 the same, the radial distances between the second intermediate shaft 50 and the first intermediate shaft 30 and the central axis 40 can also be different, so that the two are parallel to each other but staggered. Figures 1 to 4 In the various structures shown, the differential 62 is specifically arranged at one end of the electric bridge drive system, and the motors are arranged at the other end of the electric bridge drive system relative to the differential 62.

[0074] Example 2

[0075] This embodiment also relates to an electric bridge drive system, which has a structure substantially the same as that of the electric bridge drive system in the first embodiment, except that: Figure 5 As shown in , the description is still made by taking two motors as an example.

[0076] In this embodiment, each motor is connected to the first intermediate shaft 30 via a first transmission gear set and is offset to one side of the first intermediate shaft 30. The second intermediate shaft 50 and the first intermediate shaft 30 are arranged in parallel and staggered radially outward from the center shaft 40. The motors are also arranged in parallel and staggered radially outward from the second intermediate shaft 50 and the center shaft 40, and are also located close to the differential 62.

[0077] It is understandable that Figure 5 The arrangement of the electric bridge drive system is a variation of the second structure in the first embodiment, and still refers to Figure 5 As shown in the figure, the main difference between the structure of this embodiment and the above-described structure is that the first intermediate shaft 30 and the second intermediate shaft 50 are arranged in parallel and staggered radially outward from the central shaft 40. Each motor is arranged in parallel and staggered radially outward from the second intermediate shaft 50. Specifically, the second intermediate shaft 50 and the motor are arranged in a nested arrangement radially inward from the central shaft 40. This structural arrangement of this embodiment fully utilizes the space radially outward from the central shaft 40, significantly reducing the radial dimension of the central shaft 40 of the drive system. This further reduces the axial length of the entire drive system, making it more convenient for deployment within the vehicle.

[0078] Figure 5 The electric bridge drive system of the structure shown can be applied to medium and heavy trucks. Figure 6, which illustrates a variation of the fourth structural form of the first embodiment. Similarly, the difference from the aforementioned fourth structure is that the first intermediate shaft 30 and the second intermediate shaft 50 are arranged parallel and staggered radially outward of the central shaft 40, and each motor and the second intermediate shaft 50 are also arranged parallel and staggered radially outward of the central shaft 40, and the second intermediate shaft 50 and the motor are also arranged in an inner and outer nested arrangement in the radial direction of the central shaft 40. Figure 6 The electric axle drive system of the shown structural form can be used in medium-sized trucks.

[0079] In addition, in this embodiment, as one implementation form, a planetary gear reduction mechanism 70 may also be provided on the two output half-shafts 60. This planetary gear reduction mechanism 70 may be a fixed-speed ratio reduction mechanism, so that each output half-shaft 60 is transmission-connected to the wheels via the fixed-speed ratio planetary gear reduction mechanism 70. The planetary gear reduction mechanism 70 in this embodiment may employ a well-established planetary gear reduction structure in the prior art, which has advantages such as mature product quality, compact size, and high transmission efficiency.

[0080] The electric bridge drive system of this embodiment can effectively reduce the speed and increase the torque by setting the planetary gear reduction mechanism 70, thereby improving the transmission efficiency. Figure 7 and Figure 8 As shown in, where Figure 7 The electric bridge drive system is based on Figure 5 The structure shown in the figure is increased by a planetary gear reduction mechanism 70. Figure 7 The electric bridge drive system of the structure shown can be applied to heavy-duty and super-heavy-duty trucks to achieve better driving effect and stability in use. Figure 8 The electric bridge drive system is based on Figure 6 The structure shown adds a planetary gear reduction mechanism 70. At this time, Figure 8 The electric bridge drive system of the shown structural form can be applied to heavy-duty truck models to achieve better driving effect and stability in use.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric bridge drive system, characterized in that: The invention comprises a plurality of motors, two output half shafts (60) connected by a differential (62), and a central shaft (40) sleeved on one of the output half shafts (60), wherein: A first transmission mechanism is provided between each of the motors and the central shaft (40), and a second transmission mechanism is provided between the central shaft (40) and the differential (62); Each of the first transmission mechanisms comprises a first intermediate shaft (30) connected to the motor, a first shifting device (3) sleeved on the first intermediate shaft (30), and a first gear transmission unit and a second gear transmission unit with different transmission ratios arranged between the first shifting device (3) and the central shaft (40), and the first shifting device (3) can be selectively connected to the central shaft (40) through the first gear transmission unit or the second gear transmission unit; The second transmission mechanism comprises a second shifting device (4) sleeved on the central shaft (40), one side of the second shifting device (4) is connected to the differential (62) via a third gear transmission unit, the other side of the second shifting device (4) is connected to the differential (62) via a fourth gear transmission unit, or the other side of the second shifting device (4) is directly connected to the differential (62), and the transmission ratios of the third gear transmission unit and the fourth gear transmission unit are different; A plurality of second intermediate shafts (50) are provided on one side of the central shaft (40), and the plurality of second intermediate shafts (50) are transmission-connected to the differential (62) via a second transmission gear set; the third gear transmission unit and the fourth gear transmission unit are both transmission-connected to the differential (62) via the plurality of second intermediate shafts (50); The motor is connected to the first intermediate shaft (30) through a first transmission gear set and is offset to one side of the first intermediate shaft (30); the second intermediate shaft (50) and the first intermediate shaft (30) are arranged in parallel and staggered on the radial outside of the central shaft (40); the motor and the second intermediate shaft (50) are arranged in parallel and staggered on the radial outside of the central shaft (40), and the motor is arranged close to the differential (62); the second intermediate shaft (50) and the motor are arranged in an inner and outer nested manner in the radial direction of the central shaft (40).

2. The electric bridge drive system according to claim 1, wherein: The first gear transmission unit comprises a first driving gear (31) provided on one side of the first shifting device (3), and a first driven gear (41) provided on the central shaft (40) and meshing with the first driving gear (31); The second gear transmission unit comprises a second driving gear (32) arranged on the other side of the first shifting device (3), and a second driven gear (42) arranged on the central shaft (40) and meshing with the second driving gear (32); Each of the first gear transmission units shares one first driven gear (41), and / or each of the second gear transmission units shares one second driven gear (42).

3. The electric bridge drive system according to claim 1, wherein: The third gear transmission unit comprises a third driving gear (51) provided on one side of the second shifting device (4), and a third driven gear (55) provided on each of the second intermediate shafts (50) and meshing with the third driving gear (51); The fourth gear transmission unit includes a fourth driving gear (52) arranged on the other side of the second shifting device (4), and a fourth driven gear (56) arranged on each of the second intermediate shafts (50) and meshing with the fourth driving gear (52).

4. The electric bridge drive system according to claim 1, wherein: The second transmission gear set includes a sixth driven gear (64) connected to the differential (62), and a sixth driving gear (54) respectively provided on each of the second intermediate shafts (50), and each of the sixth driving gears (54) is meshed with the sixth driven gear (64).

5. The electric bridge drive system according to claim 1, wherein: A planetary gear reduction mechanism (70) is provided on each of the two output half shafts (60), and each output half shaft (60) is connected to the wheel through the planetary gear reduction mechanism (70).

6. The electric bridge drive system according to claim 1, wherein: The first transmission gear set comprises a fifth driving gear (11) arranged on the motor, and a fifth driven gear (12) arranged on the first intermediate shaft (30) and meshing with the fifth driving gear (11), wherein the outer diameter of the fifth driving gear (11) is smaller than that of the fifth driven gear (12).

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