Two-gear transmission, electric drive axle assembly and vehicle

Abstract

The invention relates to the technical field of automobile power, and particularly discloses a two-gear transmission, an electric drive axle assembly and a vehicle, and the two-gear transmission comprises a first power assembly, a second power assembly and a third power assembly. The input gear is arranged in the center of the first transmission shaft, and the driven gear is arranged in the center of the second transmission shaft, so that the two-gear transmission can move towards the motor relative to the overall position of the motor, and the third transmission shaft is embedded relative to the position of the motor; therefore, the design that the two-gear transmission is of an embedded structure relative to the motor is achieved, the overall axial size of the motor is reduced, the reduction amount of the axial size of the overall position of the motor exceeds 10% compared with the original reduction amount, space is reserved for arrangement of an air suspension, and the using comfort of a vehicle is met. By means of the two-gear transmission, the problem that in the prior art, due to the fact that the arrangement size of the two-gear transmission in the beam direction is large, the occupied vehicle arrangement space is large is effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of automobile power technology, and in particular to a two-speed transmission, an electric drive axle assembly and a vehicle. Background Art

[0002] Commercial vehicles require high power source torque, while electric motors often lack the torque output of engines. Insufficiently increasing motor torque would increase their size, resulting in increased space and weight. Furthermore, to enhance driver and passenger comfort, the use of air suspension is increasing. While air suspension can provide greater comfort and stability, it requires a larger layout space, necessitating a more compact design for other components. Furthermore, in related technologies for new energy vehicles, the connection between the transmission input shaft and the motor output shaft in the electric drive axle assembly results in a larger layout dimension along the crossbeam, which in turn occupies a significant amount of vehicle space. Summary of the Invention

[0003] The purpose of the present invention is to provide a two-speed transmission, an electric drive axle assembly and a vehicle to solve the problem in the prior art that the two-speed transmission has a large size arranged along the crossbeam direction, resulting in a large space occupied by the vehicle.

[0004] On the one hand, the present invention provides a two-speed transmission, which includes: a first power assembly, including a first transmission shaft and an input gear, the input gear is fixedly arranged on the first transmission shaft and is located at the center of the first transmission shaft, and the first transmission shaft can be connected to the output shaft of the motor; a second power assembly, including a second transmission shaft, a driven gear and two driving gears, the driven gear and the two driving gears are all fixedly arranged on the second transmission shaft, the driven gear is located at the center of the second transmission shaft, and the driven gear is meshed with the input gear; a third power assembly, including a third transmission shaft, a shifting mechanism and an output gear, the output gear is fixedly arranged on the third transmission shaft and can be connected to the half shaft, the shifting mechanism is arranged on the third transmission shaft, the shifting mechanism can be selectively connected to any one of the two driving gears to transmit the power of the second transmission shaft to the third transmission shaft, and enable the shifting mechanism to have two gear states.

[0005] As an optional technical solution for a two-speed transmission, the two driving gears are respectively located on both sides of the driven gear.

[0006] As an optional technical solution for a two-speed transmission, the shift mechanism includes a first shift gear, a second shift gear, a gear hub and a shift element. The first shift gear and the second shift gear can be slidably arranged on the third transmission shaft. The gear hub is fixedly connected to the third transmission shaft. The shift element is respectively arranged on the first shift gear and the second shift gear. The gear hub can be selectively connected to the shift element arranged on the first shift gear or the second shift gear so that the first shift gear is engaged with one of the driving gears or the second shift gear is engaged with the other driving gear.

[0007] As an optional technical solution for a two-speed transmission, the output gear is located on a side of the first shift gear facing away from the second shift gear.

[0008] On the other hand, the present invention provides an electric drive axle assembly, comprising a motor, a half-shaft, a power take-off assembly and a two-speed transmission in any of the above-mentioned schemes, wherein the first drive shaft of the two-speed transmission is connected to the output shaft of the motor, the output gear of the two-speed transmission is connected to the half-shaft, and the output gear is connected to a special device through the power take-off assembly.

[0009] As an optional technical solution for the electric drive axle assembly, the power take-off assembly includes a transmission mechanism and a power take-off output shaft. The power take-off output shaft is connected to the output gear through the transmission mechanism, and the power take-off output shaft can be connected to special equipment.

[0010] As an optional technical solution for the electric drive axle assembly, the transmission mechanism includes a power take-off transmission shaft, a primary driven gear, a secondary driving gear, a secondary driven gear, a secondary driven combining tooth and a gear sleeve. The primary driven gear and the secondary driving gear are arranged on the power take-off transmission shaft, the secondary driven gear, the secondary driven combining tooth and the gear sleeve are arranged on the power take-off output shaft, the primary driven gear is engaged with the power take-off output tooth, the secondary driving gear is engaged with the secondary driven gear, and the gear sleeve is movably arranged so as to be able to engage with the secondary driven combining tooth.

[0011] As an optional technical solution for the electric drive axle assembly, there are two motors and two two-speed transmissions, the two motors and the two two-speed transmissions are arranged in a one-to-one correspondence, and the two motors are respectively located on both sides of the wheel.

[0012] As an optional technical solution of the electric drive axle assembly, the output shaft of the motor and the first transmission shaft are connected via a spline.

[0013] In yet another aspect, the present invention provides a vehicle comprising the electric drive axle assembly according to any of the above solutions.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides a two-speed transmission comprising a first power assembly, a second power assembly, and a third power assembly. The first power assembly comprises a first transmission shaft and an input gear; the second power assembly comprises a second transmission shaft, a driven gear, and two driving gears; and the third power assembly comprises a third transmission shaft, a shift mechanism, and an output gear. In the two-speed transmission of the present invention, the input gear is positioned at the center of the first transmission shaft, and the driven gear is positioned at the center of the second transmission shaft. This allows the overall position of the two-speed transmission relative to the motor to be moved toward the motor, allowing the third transmission shaft to be embedded relative to the motor. This achieves a design where the two-speed transmission is embedded relative to the motor, reducing the overall axial dimension of the motor by over 10% compared to the original design. This allows for space to be allocated for the air suspension, ensuring vehicle comfort. Furthermore, the two-speed transmission of the present invention has two gears, meeting the high-speed and high-torque requirements of the connected electric drive axle assembly. The two-speed transmission of the present invention effectively addresses the problem of conventional two-speed transmissions being relatively large along the crossbeam, which occupies a significant amount of vehicle space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a two-speed transmission according to an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the positional relationship of an electric drive axle assembly installed on a vehicle in the prior art;

[0018] Figure 3 Schematic diagram of the positional relationship of an electric drive axle assembly installed on a vehicle in another embodiment of the present invention.

[0019] In the picture:

[0020] 1. First power assembly; 11. First transmission shaft; 12. Input gear;

[0021] 2. Second power assembly; 21. Second transmission shaft; 22. Driven gear; 23. Driving gear;

[0022] 3. Third power assembly; 31. Third transmission shaft; 32. Shift mechanism; 321. First shift gear; 322. Second shift gear; 323. Gear hub; 33. Output gear;

[0023] 4. Motor;

[0024] 5. Power take-off assembly; 51. Transmission mechanism; 511. Power take-off transmission shaft; 512. Primary driven gear; 513. Secondary driving gear; 514. Secondary driven gear; 515. Secondary driven coupling gear; 516. Gear sleeve; 52. Power take-off output shaft;

[0025] 6. Two-speed transmission;

[0026] 7. Wheels. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] like Figure 1 As shown, this embodiment provides a two-speed transmission, which includes a first power assembly 1, a second power assembly 2 and a third power assembly 3. Among them, the first power assembly 1 includes a first transmission shaft 11 and an input gear 12, the input gear 12 is fixedly set on the first transmission shaft 11 and is located at the center of the first transmission shaft 11, and the first transmission shaft 11 can be connected to the output shaft of the motor 4; the second power assembly 2 includes a second transmission shaft 21, a driven gear 22 and two driving gears 23, the driven gear 22 and the two driving gears 23 are all fixedly set on the second transmission shaft 21, the driven gear 22 is located at the center of the second transmission shaft 21, and the driven gear 22 is meshed with the input gear 12; the third power assembly 3 includes a third transmission shaft 31, a shifting mechanism 32 and an output gear 33, the output gear 33 is fixedly set on the third transmission shaft 31 and can be connected to the half shaft, the shifting mechanism 32 is set on the third transmission shaft 31, the shifting mechanism 32 can be selectively connected to any one of the two driving gears 23 to transmit the power of the second transmission shaft 21 to the third transmission shaft 31, and enable the shifting mechanism 32 to have two gear states.

[0032] The two-speed transmission of the present invention sets the input gear 12 at the center of the first transmission shaft 11, and the driven gear 22 at the center of the second transmission shaft 21. This allows the overall position of the two-speed transmission relative to the motor to be moved toward the motor, allowing the third transmission shaft 31 to be embedded relative to the motor. This achieves a design in which the two-speed transmission is embedded relative to the motor, reducing the overall axial size of the motor. This, in turn, reduces the overall axial size of the motor by more than 10% compared to the original, leaving space for the air suspension arrangement and ensuring vehicle comfort. Furthermore, the two-speed transmission of the present invention has two gears, meeting the high-speed and high-torque requirements of the connected electric drive axle assembly. The two-speed transmission of the present invention effectively solves the problem of the prior art two-speed transmission being relatively large in size along the crossbeam, resulting in a large amount of space occupied by the vehicle.

[0033] In some embodiments, the shift mechanism 32 includes a first shift gear 321, a second shift gear 322, a gear hub 323, and a shift element. The first shift gear 321 and the second shift gear 322 are slidably mounted on the third transmission shaft 31. The gear hub 323 is fixedly connected to the third transmission shaft 31. The shift element is disposed on the first shift gear 321 and the second shift gear 322, respectively. The gear hub 323 can selectively be drivingly connected to the shift element disposed on the first shift gear 321 or the second shift gear 322, so that the first shift gear 321 meshes with one driving gear 23 or the second shift gear 322 meshes with the other driving gear 23. In this configuration, the gear hub 323 can selectively be drivingly connected to the shift element disposed on the first shift gear 321 or the second shift gear 322, thereby achieving the purpose of shifting. The shift element is a shift coupling tooth.

[0034] In this embodiment, the two driving gears 23 are located on either side of the driven gear 22. Because shifting elements need to be positioned between the first and second shift gears 321, 322 on the third transmission shaft 31, space is also reserved between the two driving gears 23 on the second transmission shaft 21, allowing the driven gear 22 on the second transmission shaft 21 to be positioned between the two driving gears 23. This effectively reduces the overall axial dimension of the motor by over 10% compared to the original design, leaving room for the air suspension and ensuring optimal vehicle comfort.

[0035] In some embodiments, the output gear 33 is located on a side of the first shift gear 321 away from the second shift gear 322. This facilitates the connection between the output gear 33 and the half shaft.

[0036] like Figure 2 , which is a schematic diagram of the positional relationship of an electric drive axle assembly installed on a vehicle in the prior art;

[0037] like Figure 3 As shown, this embodiment also provides an electric drive axle assembly, comprising a motor 4, axle shafts, a power take-off assembly 5, and the two-speed transmission 6 described above. The first drive shaft 11 of the two-speed transmission 6 is connected to the output shaft of the motor 4, and the output gear 33 of the two-speed transmission 6 is connected to the axle shafts. The output gear 33 is connected to specialized equipment via the power take-off assembly 5. This arrangement allows power to be transmitted to specialized equipment via the power take-off assembly 5, thereby achieving multifunctional operation of the electric drive axle assembly and improving its power utilization.

[0038] Furthermore, the power take-off assembly 5 includes a transmission mechanism 51 and a power take-off output shaft 52. The power take-off output shaft 52 is connected to the output gear 33 via the transmission mechanism 51. This allows the output gear 33 to transmit power to the transmission mechanism 51, which then transmits the power to the power take-off output shaft 52. Finally, the power is transmitted to the dedicated equipment via the power take-off output shaft 52. The transmission mechanism 51 includes, but is not limited to, a multi-stage gear transmission structure to meet practical needs.

[0039] In some embodiments, the transmission mechanism 51 includes a power take-off transmission shaft 511, a primary driven gear 512, a secondary driving gear 513, a secondary driven gear 514, a secondary driven combining tooth 515 and a gear engaging sleeve 516. The primary driven gear 512 and the secondary driving gear 513 are arranged on the power take-off transmission shaft 511, and the secondary driven gear 514, the secondary driven combining tooth 515 and the gear engaging sleeve 516 are arranged on the power take-off output shaft 52. The primary driven gear 512 is engaged with the power take-off output tooth, the secondary driving gear 513 is engaged with the secondary driven gear 514, and the gear engaging sleeve 516 is movably arranged so as to be able to engage with the secondary driven combining tooth 515. When the gear sleeve 516 moves, the power take-off output shaft 52 is fixedly connected to the secondary driven gear 514, the output gear 33 outputs power and transmits it to the primary driven gear 512, the primary driven gear 512 is fixedly connected to the secondary driving gear 513, and the power is transmitted to the secondary driven gear 514 through the secondary driving gear 513, thereby transmitting the power to the power take-off output shaft 52, and then transmitting the power to special equipment to realize multi-functional operation.

[0040] In this embodiment, there are two motors 4 and two two-speed transmissions 6. The two motors 4 and two two-speed transmissions 6 are provided in a one-to-one correspondence, and the two motors 4 are located on either side of the wheels 7. This arrangement can meet the vehicle's torque requirements while achieving uninterrupted power transmission.

[0041] In some embodiments, the output shaft of the motor 4 and the first transmission shaft 11 are connected via a spline, which can ensure the connection strength between the motor 4 and the first transmission shaft 11.

[0042] This embodiment also provides a vehicle comprising the electric drive axle assembly of the above-described scheme. In the vehicle employing the present invention, the input gear 12 is positioned at the center of the first transmission shaft 11, and the driven gear 22 is positioned at the center of the second transmission shaft 21. This allows the overall position of the two-speed transmission relative to the motor to be moved toward the motor, allowing the third transmission shaft 31 to be embedded relative to the motor. This achieves a design in which the two-speed transmission is embedded relative to the motor, reducing the overall axial dimension of the motor. This, in turn, reduces the overall axial dimension of the motor by more than 10% compared to the original, leaving space for the arrangement of the air suspension and ensuring vehicle comfort. Furthermore, the two-speed transmission of the present invention has two gears, meeting the high speed and high torque requirements of the connected electric drive axle assembly. The vehicle of the present invention effectively solves the problem of the prior art two-speed transmission being relatively large in size along the crossbeam, resulting in a large space occupied by the vehicle.

[0043] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A two-speed transmission, characterized in that: include: A first power assembly (1) comprises a first transmission shaft (11) and an input gear (12), wherein the input gear (12) is fixedly arranged on the first transmission shaft (11) and located at the center of the first transmission shaft (11), and the first transmission shaft (11) is capable of being connected to an output shaft of a motor (4); A second power assembly (2) comprises a second transmission shaft (21), a driven gear (22) and two driving gears (23), wherein the driven gear (22) and the two driving gears (23) are fixedly arranged on the second transmission shaft (21), the driven gear (22) is located at the center of the second transmission shaft (21), and the driven gear (22) is meshed with the input gear (12); The third power assembly (3) comprises a third transmission shaft (31), a shift mechanism (32) and an output gear (33). The output gear (33) is fixedly arranged on the third transmission shaft (31) and can be connected to the half shaft. The shift mechanism (32) is arranged on the third transmission shaft (31). The shift mechanism (32) can be selectively connected to any one of the two driving gears (23) to transmit the power of the second transmission shaft (21) to the third transmission shaft (31), and the shift mechanism (32) has two gear states.

2. The two-speed transmission according to claim 1, characterized in that: The two driving gears (23) are respectively located on both sides of the driven gear (22).

3. The two-speed transmission according to claim 1, characterized in that: The shift mechanism (32) comprises a first shift gear (321), a second shift gear (322), a gear hub (323) and a shift element. The first shift gear (321) and the second shift gear (322) can be slidably arranged on the third transmission shaft (31). The gear hub (323) is fixedly connected to the third transmission shaft (31). The shift element is respectively arranged on the first shift gear (321) and the second shift gear (322). The gear hub (323) can be selectively connected to the shift element arranged on the first shift gear (321) or the second shift gear (322) in a transmission manner, so that the first shift gear (321) is engaged with one of the driving gears (23) or the second shift gear (322) is engaged with the other of the driving gears (23).

4. The two-speed transmission according to claim 3, characterized in that: The output gear (33) is located on a side of the first shift gear (321) facing away from the second shift gear (322).

5. An electric drive axle assembly, characterized in that: The invention comprises a motor (4), a half shaft, a power take-off assembly (5) and a two-speed transmission (6) according to any one of claims 1 to 4, wherein a first transmission shaft (11) of the two-speed transmission (6) is connected to an output shaft of the motor (4), an output gear (33) of the two-speed transmission (6) is connected to the half shaft, and the output gear (33) is connected to a dedicated device through the power take-off assembly (5).

6. The electric drive axle assembly according to claim 5, characterized in that: The power take-off assembly (5) comprises a transmission mechanism (51) and a power take-off output shaft (52). The power take-off output shaft (52) is connected to the output gear (33) via the transmission mechanism (51). The power take-off output shaft (52) can be connected to a dedicated device.

7. The electric drive axle assembly according to claim 6, characterized in that: The transmission mechanism (51) comprises a power take-off transmission shaft (511), a primary driven gear (512), a secondary driving gear (513), a secondary driven gear (514), a secondary driven coupling tooth (515) and a gear engaging sleeve (516); the primary driven gear (512) and the secondary driving gear (513) are arranged on the power take-off transmission shaft (511); the secondary driven gear (514), the secondary driven coupling tooth (515) and the gear engaging sleeve (516) are arranged on the power take-off output shaft (52); the primary driven gear (512) and the power take-off output tooth are meshed; the secondary driving gear (513) and the secondary driven gear (514) are meshed; and the gear engaging sleeve (516) is movably arranged so as to be able to mesh with the secondary driven coupling tooth (515).

8. The electric drive axle assembly according to claim 5, characterized in that: There are two motors (4) and two two-speed transmissions (6), and the two motors (4) and the two two-speed transmissions (6) are arranged in a one-to-one correspondence. The two motors (4) are respectively located on both sides of the wheel (7).

9. The electric drive axle assembly according to claim 5, characterized in that: The output shaft of the motor (4) and the first transmission shaft (11) are connected via a spline.

10. A vehicle, characterized in that: Including the electric drive axle assembly according to any one of claims 5-9.

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