Gearbox, drive axle and vehicle

Abstract

The application relates to a gearbox, a drive axle and a vehicle. The gearbox comprises a gear shifting unit, the gear shifting unit comprises a housing, a motor and a transmission gear set; the housing has a sub-cavity; the motor is arranged outside the housing, and an output shaft of the motor extends into the sub-cavity; the transmission gear set is arranged in the sub-cavity, and the transmission gear set is in transmission connection with the output shaft of the motor; wherein, there are two gear shifting units, the motors of the two gear shifting units are coaxially arranged, and the motors of the two gear shifting units are mirror images of each other. According to the application, the motors of the two gear shifting units are coaxially arranged and are mirror images of each other, so that the symmetry of the structure of the gearbox and the force symmetry of the gearbox can be improved, thereby the structural balance of the vehicle can be improved, and the stability of the vehicle can be improved.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more particularly to a transmission, drive axle, and vehicle. Background Technology

[0002] Forklifts are industrial material handling vehicles widely used in warehousing, logistics, and factories. They are primarily used for loading, unloading, stacking, and short-distance transport of goods. Electric forklifts are powered by electricity. They use batteries as their power source and a gearbox drives the half-shafts to rotate, which in turn drives the wheels. This allows the electric forklift to move forward and backward, thus performing various operational actions. The gearbox includes a motor that converts electrical energy into mechanical energy and a transmission gear set that transmits the motor's kinetic energy to the half-shafts.

[0003] In related technologies, to improve the control flexibility of electric forklifts in situations such as turning, the gearbox of the electric forklift is equipped with two motors. However, the gearbox of this type of electric forklift has an asymmetrical left-right structure. This not only leads to a complex gearbox structure but also causes the center of gravity of the electric forklift to shift, which has an adverse effect on the stability of the electric forklift. Summary of the Invention

[0004] This application provides a gearbox that improves the structural symmetry of the gearbox, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a gearbox is provided, the gearbox including a transmission unit, the transmission unit including a housing, a motor and a transmission gear set; the housing has a sub-cavity; the motor is disposed outside the housing, and the output shaft of the motor extends into the sub-cavity; the transmission gear set is disposed inside the sub-cavity, and the transmission gear set is drively connected to the output shaft of the motor; wherein, there are two transmission units, the motors of the two transmission units are coaxially arranged, and the motors of the two transmission units are mirror images of each other.

[0006] Optionally, the housings of the two transmission units are mirror images of each other along the radial plane of symmetry between the two motors.

[0007] Optionally, the transmission gear sets of the two speed change units are mirror images of each other along the radial plane of symmetry between the two motors.

[0008] Optionally, the motor of each transmission unit is located away from the other transmission unit, and the housings of the two transmission units are connected to each other.

[0009] Optionally, gear oil is provided in the sub-cavities of both transmission units.

[0010] Optionally, the sub-cavities of the two transmission units are connected.

[0011] Optionally, both speed change units use disc-type water-cooled motors.

[0012] Optionally, the housing of each transmission unit includes a sub-box and a cover plate; the sub-box has a sub-cavity and a first opening, the first opening communicating with the sub-cavity; the cover plate is connected to the sub-box and closes the first opening; wherein, in each transmission unit, the motor is mounted on the cover plate.

[0013] Optionally, in each transmission unit, the outer wall of the sub-box is provided with a second opening, which communicates with the sub-cavity. The second opening is located between the first openings of the two transmission units. The transmission unit also includes two bearing assemblies, which are located on both sides of the second opening in each transmission unit. The transmission gear set includes a final stage gear, and the two ends of the gear shaft of the final stage gear are rotatably engaged with the two bearing assemblies respectively.

[0014] Optionally, in each transmission unit, the gear shaft of the final stage gear is configured to be splinedly connected to the half-shaft of the drive axle.

[0015] Optionally, the motor of each transmission unit is located away from the other transmission unit, and the sub-boxes of the two transmission units are connected to each other; the gearbox also includes a flange ring, the inner diameter side of which is connected to the sub-boxes of the two transmission units, the flange ring is arranged around the second opening of the two transmission units, and the flange ring is configured to connect to the axle housing of the drive axle.

[0016] Optionally, the sub-boxes of the two transmission units are integrated into one unit.

[0017] Optionally, in each transmission unit, the bearing assembly includes a bearing housing and end bearings mounted on the bearing housing. The bearing housing is connected to the sub-box, and the two ends of the gear shaft of the final gear pass through the end bearings of the two bearing assemblies respectively.

[0018] Optionally, in each transmission unit, the bearing housing includes a first housing and a second housing. The first housing is connected to the sub-box, and the second housing is detachably connected to the first housing to define a bearing mounting hole. The end bearing is installed in the bearing mounting hole.

[0019] Optionally, in each transmission unit, the end bearings of a portion of the bearing assembly are threadedly connected to the bearing mounting holes.

[0020] Optionally, the motor of each transmission unit is located away from the other transmission unit, and the sub-boxes of the two transmission units are connected to each other; wherein the first seats of the two bearing assemblies located between the two second openings are integrally arranged; and / or, the second seats of the two bearing assemblies located between the two second openings are integrally arranged.

[0021] According to a second aspect of this application, a drive axle is provided, the drive axle including an axle housing, half shafts and the aforementioned gearbox; there are two half shafts, both of which are rotatably disposed within the axle housing, and the two half shafts are respectively located at both ends of the axle housing; the final gears of the transmission gear sets of the two transmission units are respectively connected to the two half shafts for transmission, and the housing is connected to the axle housing.

[0022] Alternatively, the bridge housing may be a single-piece casting.

[0023] Optionally, the drive axle also includes wheel-side brakes disposed at the ends of the axle housing; the wheel-side brakes are configured to brake when the vehicle is in motion and when the vehicle is parked.

[0024] According to a third aspect of this application, a vehicle is provided that includes the aforementioned drive axle.

[0025] In the transmission of this application embodiment, by arranging the motors of the two transmission units coaxially and as mirror images of each other, the structural symmetry and force symmetry of the transmission can be improved, thereby enhancing the structural balance of the vehicle and thus improving its stability. This, in turn, improves the reliability of vehicle operation.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. 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 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] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0029] Figure 1 This is a schematic diagram of the structure of the gearbox provided in an exemplary embodiment of this disclosure;

[0030] Figure 2 This is a side view of the gearbox provided in an exemplary embodiment of this disclosure;

[0031] Figure 3 yes Figure 2 Sectional view of AA;

[0032] Figure 4 This is a schematic diagram of the transmission gear set provided in an exemplary embodiment of this disclosure;

[0033] Figure 5 This is a schematic diagram of the structure of the sub-box provided in an exemplary embodiment of this disclosure;

[0034] Figure 6 This is a side view of the sub-box provided in an exemplary embodiment of this disclosure;

[0035] Figure 7 yes Figure 6 Sectional view of BB;

[0036] Figure 8 This is a side view of the gearbox provided in an exemplary embodiment of this disclosure from another direction;

[0037] Figure 9 yes Figure 8 Sectional view of CC;

[0038] Figure 10 This is a schematic diagram of the drive bridge provided in an exemplary embodiment of this disclosure.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100-Gearbox;

[0041] 10 - Transmission unit;

[0042] 11-Shell; 111-Sub-cavity; 112-Sub-box; 113-Cover plate; 114-First opening; 115-Second opening;

[0043] 12-Motor;

[0044] 13-Transmission gear set; 131-Input gear; 132-Intermediate gear; 133-Final stage gear; 1331-Internal spline; 134-Gear shaft;

[0045] 14-Bearing assembly; 141-Bearing housing; 1411-First housing; 1412-Second housing; 142-End bearing; 143-Bearing mounting hole; 144-Thread;

[0046] 15-Flange ring;

[0047] 200-Drive axle; 21-Axle housing; 22-Half shaft; 23-Wheel brake. Detailed Implementation

[0048] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0049] The following combination Figures 1 to 10 The present application provides a detailed description of a gearbox 100, a drive axle 200, and a vehicle, as provided in the embodiments of this application.

[0050] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of the gearbox 100 provided in an exemplary embodiment of this disclosure. Figure 2 This is a side view of the gearbox 100 provided in an exemplary embodiment of this disclosure. Figure 3 yes Figure 2 A cross-sectional view of AA. In a first aspect, embodiments of this application provide a gearbox 100. The gearbox 100 includes a transmission unit 10. The transmission unit 10 includes a housing 11, a motor 12, and a transmission gear set 13. The housing 11 has a sub-cavity 111. The motor 12 is disposed outside the housing 11. The output shaft of the motor 12 extends into the sub-cavity 111. The transmission gear set 13 is disposed within the sub-cavity 111. The transmission gear set 13 is drively connected to the output shaft of the motor 12. There are two transmission units 10. The motors 12 of the two transmission units 10 are coaxially arranged. The motors 12 of the two transmission units 10 are mirror images of each other.

[0051] It is understood that the gearbox 100 provided in this embodiment may not be equipped with a brake. When the gearbox 100 is applied to the drive axle 200, the brake is located at the end of the axle housing 21 of the drive axle 200. In this way, the gearbox structure can be compact and occupy a smaller volume.

[0052] It is understood that the housing 11 is provided with multiple mounting holes, and bearings are installed in the mounting holes to support the rotation of each gear of the transmission gear set 13, so as to reduce the resistance of gear rotation and reduce the wear of the rotating mating parts between the gear shaft 134 and the housing 11.

[0053] It is understood that the transmission gear set 13 includes at least an input gear 131 and a final stage gear 133. The transmission gear set 13 can be a reduction gear set of any number of stages, such as two, three, or four. Specifically, the input gear 131 is coaxially connected to the output shaft of the motor 12, and the final stage gear 133 is connected to the half-shaft 22 of the drive axle 200. The output shaft of the motor 12 drives the input gear 131 to rotate. The input gear 131 directly meshes with the final stage gear 133, or the input gear 131 meshes with the final stage gear 133 through one or more intermediate gears 132 to drive the final stage gear 133 to rotate. Figure 4 As shown, Figure 4This is a schematic diagram of the transmission gear set 13 provided in an exemplary embodiment of this disclosure. Then, the final stage gear 133 drives the half-shaft 22 to rotate, and the half-shaft 22 drives the wheels to rotate, thereby realizing the vehicle's forward and backward movement. When the vehicle turns, the output speed of the two motors 12 is controlled by a relevant control program to achieve differential speed control of the two wheels.

[0054] It is understandable that the output shafts of the motors 12 of the two speed change units 10 can be set facing each other or back to back.

[0055] In this embodiment, by setting the motors 12 of the two transmission units 10 coaxially and as mirror images of each other, the structural symmetry and force symmetry of the transmission 100 can be improved, thereby enhancing the structural balance of the vehicle and thus improving its stability. This, in turn, improves the reliability of vehicle operation.

[0056] In addition, by setting the motors 12 of the two transmission units 10 to be coaxial and mirror images of each other, the structure of the parts on the housing 11 that mate with the motors 12 can be the same, which helps to simplify the structure of the gearbox 100, reduce the manufacturing difficulty of the gearbox 100, and thus improve the manufacturing efficiency of the gearbox 100.

[0057] Please see Figure 2 In some embodiments, the housings 11 of the two transmission units 10 are mirror images of each other along the radial plane of symmetry between the two motors 12. This further enhances the structural symmetry of the transmission 100, thereby improving the force symmetry of the transmission 100 and thus improving the structural balance and center of gravity stability of the vehicle.

[0058] Please see Figure 4 In some embodiments, the transmission gear sets 13 of the two transmission units 10 are mirror images of each other along the radial plane of symmetry between the two motors 12. This further enhances the structural symmetry of the transmission 100, thereby improving the force symmetry of the transmission 100 and thus improving the structural balance and center of gravity stability of the vehicle.

[0059] Please see Figure 1 In some embodiments, the motor 12 of each transmission unit 10 is positioned away from the other transmission unit 10, and the housings 11 of the two transmission units 10 are interconnected. In this way, by interconnecting the housings 11 of the two transmission units 10, the structural strength of the housings 11 can be improved, thereby enhancing the structural reliability of the transmission.

[0060] Furthermore, by connecting the housings 11 of the two transmission units 10 to each other, an opening can be provided on the axle housing 21 of the drive axle 200 to enable the transmission connection between the final output gear of the gearbox 100 and the half-shaft 22. This approach, on the one hand, helps maintain the structural integrity of the axle housing 21, thereby improving the load-bearing capacity of the drive axle 200 and resulting in better economic efficiency; on the other hand, it allows the gearbox 100 to be directly applied to existing single-drive axles 200, reducing changes in the manufacturing process of the axle housing 21, thus lowering production costs and improving production efficiency.

[0061] In some embodiments, gear oil is provided in the sub-cavities 111 of both transmission units 10.

[0062] It is understandable that gear oil can form an oil film on the surface of each gear in the drive gear set, which helps to reduce the direct contact between meshing gears, thereby reducing the coefficient of friction during gear transmission and reducing wear caused by gear transmission. This extends the service life of the gears, makes gear transmission smoother, reduces energy loss during transmission, and thus improves the transmission efficiency of the gearbox 100.

[0063] In some embodiments, the sub-cavities 111 of the two transmission units 10 are connected. In this way, oil can be passed through the same part of the sub-cavities 111 between the two transmission units 10 to balance the amount of gear oil in the two sub-cavities 111, thereby improving the weight consistency of the two transmission units 10, which in turn helps to improve the structural balance and center of gravity stability of the vehicle.

[0064] It is understandable that the sub-cavities 111 of the two transmission units 10 can be connected by an oil passage located inside the housing 11, or by an external pipeline.

[0065] Please see Figure 1 In some embodiments, the motors 12 of both speed change units 10 are disc-type water-cooled motors 12.

[0066] It can be understood that the disc-type water-cooled motor 12 is a disc-type motor 12 that uses water cooling for heat dissipation. The disc-type water-cooled motor 12 includes components such as stator, rotor, shaft and housing.

[0067] Among them, the disc-type water-cooled motor 12 has advantages such as high speed, large torque, high efficiency, small axial dimension, and reliable operation. Moreover, the disc-type water-cooled motor 12 has a compact structure, which can help improve the structural compactness of the gearbox 100, thereby improving the structural compactness of the drive axle 200.

[0068] Furthermore, the disc-type water-cooled motor 12 has a short axial dimension, which results in a smaller axial dimension of the gearbox 100 relative to the motor 12. Therefore, the gearbox 100 provided in this embodiment is suitable for small-tonnage electric forklifts.

[0069] It is understood that, in addition to the disc-type water-cooled motor 12, other motors 12 can also be used in this application, such as the air-cooled motor 12. The specific choice can be made according to the application scenario.

[0070] Please see Figure 1 as well as Figures 5 to 7 , Figure 5 This is a schematic diagram of the structure of the sub-box 112 provided in an exemplary embodiment of this disclosure. Figure 6 This is a side view of the sub-box 112 provided in an exemplary embodiment of this disclosure. Figure 7 yes Figure 6 A cross-sectional view of BB. In some embodiments, the housing 11 of each transmission unit 10 includes a sub-housing 112 and a cover plate 113. The sub-housing 112 has a sub-cavity 111 and a first opening 114. The first opening 114 communicates with the sub-cavity 111. The cover plate 113 is connected to the sub-housing 112. The cover plate 113 closes the first opening 114; wherein, in each transmission unit 10, a motor 12 is disposed on the cover plate 113.

[0071] It is understood that the cover plate 113 is detachably connected to the sub-box 112 by bolts, and the motor housing 12 is detachably connected to the cover plate 113 by bolts.

[0072] In this embodiment, by configuring the housing 11 as a combination of a cover plate 113 and a sub-box 112, the sub-cavity 111 for mounting the drive gear set can be defined, and the housing 11 can also have a first opening 114 for assembling the drive gear. This improves the assembly efficiency and maintainability of the gearbox 100.

[0073] Please see Figure 5 and Figure 7 In some embodiments, in each transmission unit 10, the outer wall of the sub-box 112 is provided with a second opening 115. The second opening 115 communicates with the sub-cavity 111. The second opening 115 is located between the first openings 114 of the two transmission units 10. The transmission unit 10 also includes two bearing assemblies 14. In each transmission unit 10, the two bearing assemblies 14 are respectively located on both sides of the second opening 115, and the transmission gear set 13 includes a final stage gear 133, the two ends of the gear shaft 134 of the final stage gear 133 being rotatably engaged with the two bearing assemblies 14 respectively.

[0074] It is understood that the side of the final gear 133 away from the motor 12 passes through the second opening 115 from the sub-cavity 111 and is located outside the housing 11.

[0075] It is understood that when the gearbox 100 is applied to the drive axle 200, the second opening 115 faces the axle housing 21 of the drive axle 200, so that the side of the final gear 133 away from the motor 12 is directly covered by the axle housing.

[0076] It is understood that the final stage gear 133 is driven to drive the half shaft 22 of the drive axle 200 to rotate the half shaft 22.

[0077] In this embodiment, the bearing assembly 14 can be directly operated to install and maintain the final gear 133, thereby improving the assembly efficiency and maintenance convenience of the gearbox 100.

[0078] Please see Figure 8 and Figure 9 , Figure 8 This is a side view of the gearbox 100 provided in an exemplary embodiment of this disclosure from another direction. Figure 9 yes Figure 8 A cross-sectional view of the C-C configuration. In some embodiments, in each transmission unit 10, the gear shaft 134 of the final stage gear 133 is configured to be splinedly connected to the half-shaft 22 of the drive axle.

[0079] Specifically, the gear shaft 134 of the final stage gear 133 is provided with an internal spline 1331. The half shaft 22 of the drive axle is provided with an external spline. The internal spline 1331 is configured to mesh with the external spline of the half shaft 22 of the drive axle.

[0080] It is understood that the end of the half-shaft 22 is inserted into the gear shaft 134, and the external spline of the half-shaft 22 is connected to the internal spline 1331 of the gear shaft 134 of the final stage gear 133.

[0081] In this embodiment, the above-mentioned arrangement allows for a larger contact area between the gear shaft 134 of the final stage gear 133 and the half shaft 22, thereby enabling a larger torque to be transmitted between them. This facilitates the increase in the magnitude of the transmitted torque, improves transmission efficiency, and reduces energy loss.

[0082] Please see Figure 1 and Figure 5In some embodiments, the motor 12 of each transmission unit 10 is positioned away from the other transmission unit 10. The sub-boxes 112 of the two transmission units 10 are interconnected. The transmission 100 also includes a flange ring 15, the inner diameter side of which is connected to the sub-boxes 112 of the two transmission units 10. The flange ring 15 surrounds the second opening 115 of the two transmission units 10. The flange ring 15 is configured to connect to the axle housing 21 of the drive axle 200; specifically, the flange ring 15 is configured to connect to the axle housing 21 of the drive axle 200 by bolts. Thus, by connecting the transmission 100 and the axle housing 21 through the flange ring 15, the connection between the transmission 100 and the axle housing 21 can withstand greater pressure and tension, thereby ensuring the reliability of the connection. Under vibration conditions, the connection through the flange ring 15 effectively prevents gear oil leakage and loosening of the transmission 100 relative to the axle housing 21, thus improving vehicle reliability.

[0083] It is advantageous that the axle housing 21 has an axle housing, the gearbox 100 is installed at the axle housing, and the final stage output gear is housed within the axle housing.

[0084] Please see Figure 7 In some embodiments, the sub-boxes 112 of the two transmission units 10 are integrally formed. This reduces the number of connection points in the transmission 100, thereby avoiding stress concentration, improving the stress state of the transmission 100, and making the transmission 100 structurally stronger, capable of withstanding greater external forces and loads.

[0085] Please see Figure 1 and Figure 9 In some embodiments, in each transmission unit 10, the bearing assembly 14 includes a bearing housing 141 and end bearings 142 mounted on the bearing housing 141. The bearing housing 141 is connected to the sub-box 112. The two ends of the gear shaft 134 of the final stage gear 133 pass through the end bearings 142 of the two bearing assemblies 14 respectively. Using bearing rotation support can reduce energy loss and improve transmission efficiency.

[0086] For example, the end bearing 142 is a tapered roller bearing.

[0087] Specifically, the inner ring of the end bearing 142 is interference-fitted with the gear shaft, and the outer ring of the end bearing 142 is interference-fitted with the bearing housing 141.

[0088] Please see Figure 1 and Figure 9In some embodiments, in each transmission unit 10, the bearing housing 141 includes a first housing 1411 and a second housing 1412. The first housing 1411 is connected to the sub-housing 112. The second housing 1412 is detachably connected to the first housing 1411 to define a bearing mounting hole 143. An end bearing 142 is installed in the bearing mounting hole 143. This divides the bearing housing 141 into two parts, allowing the bearing housing 141 to be installed in the appropriate position on the first housing 1411, and then the first housing 1411 and the second housing 1412 to be fixed together using bolts or other connecting components. This simplifies the installation process and improves assembly efficiency.

[0089] Please see Figure 9 In some embodiments, in each transmission unit 10, the end bearing 142 of a portion of the bearing assembly 14 is threaded 144 into the bearing mounting hole 143.

[0090] It is understood that each transmission unit 10 includes two bearing assemblies 14, and the end bearing 142 of one bearing assembly 14 of each transmission unit 10 is connected to the bearing mounting hole 143 by a thread 144.

[0091] Specifically, the end bearing 142 of each transmission unit 10, located away from the other transmission unit 10, is threaded 144 into the bearing mounting hole 143. Correspondingly, the bearing housing 141 has a thread 144 at the portion that mates with the end bearing 142, such as... Figure 7 and Figure 9 As shown.

[0092] In this embodiment, by connecting the end bearing 142 of the bearing assembly 14 to the bearing mounting hole 143 threaded 144, the spacing between the two end bearings 142 in each transmission unit 10 can be adjusted without the need for adjusting washers, thereby improving assembly efficiency.

[0093] Please see Figure 7 In some embodiments, the motor 12 of each transmission unit 10 is positioned away from the other transmission unit 10, and the sub-boxes 112 of the two transmission units 10 are interconnected. The first seats 1411 of the two bearing assemblies 14 located between the two second openings 115 are integrally formed. This reduces the number of connection points in the gearbox 100, thereby avoiding stress concentration, improving the stress state of the gearbox 100, and increasing the structural strength of the gearbox 100, enabling it to withstand greater external forces and loads.

[0094] Specifically, the first unit 1411 is integrated with the sub-unit 112.

[0095] Please see Figure 9In some embodiments, the motor 12 of each transmission unit 10 is positioned away from the other transmission unit 10, and the sub-boxes 112 of the two transmission units 10 are interconnected. The second seats 1412 of the two bearing assemblies 14 located between the two second openings 115 are integrally formed. This reduces the number of connection points in the gearbox 100, thereby avoiding stress concentration, improving the stress state of the gearbox 100, and increasing the structural strength of the gearbox 100, enabling it to withstand greater external forces and loads.

[0096] It is understood that the transmission 100 provided in the embodiments of this application does not have a parking brake mechanism, and the structure of the transmission 100 is simple and compact. When the vehicle brakes, the service brake and parking brake are achieved by relying on the wheel-side brakes 23 provided on the left and right sides of the axle housing 21, so that the wheels on both sides can be braked at the same time, which is highly reliable.

[0097] Furthermore, the appearance of the gearbox 100 provided in the embodiments of this application is deformable. The accompanying drawings are only examples of one structure, and the appearance of the gearbox 100 is not limited by the shape shown in the drawings.

[0098] Please see Figure 10 , Figure 10 This is a schematic diagram of the drive axle 200 provided in an exemplary embodiment of this disclosure. In a second aspect, embodiments of this application provide a drive axle 200. The drive axle 200 includes an axle housing 21, half-shafts 22, and the aforementioned gearbox 100. There are two half-shafts 22. Both half-shafts 22 are rotatably disposed within the axle housing 21. The two half-shafts 22 are located at opposite ends of the axle housing 21. The final gears 133 of the transmission gear sets 13 of the two transmission units 10 are respectively connected to the two half-shafts 22 in a transmission connection. The housing 11 is connected to the axle housing 21.

[0099] It is understood that the drive axle 200 includes the aforementioned gearbox 100, and the drive axle 200 has all the beneficial effects of the aforementioned gearbox 100, which will not be repeated here.

[0100] Please see Figure 10 In some embodiments, the bridge housing 21 is an integral casting.

[0101] Understandably, the integral casting process allows the axle housing 21 to form a complete and continuous structure, avoiding weak points caused by splicing or welding. This enables the axle housing 21 to withstand greater loads, such as vertical forces, driving forces, braking forces, and lateral forces during vehicle operation. Consequently, the axle housing 21 is less prone to deformation and damage, thus improving its reliability and durability, making it suitable for heavy-duty vehicles and harsh road conditions.

[0102] Furthermore, the integral cast axle housing 21 can be made into more complex shapes according to design requirements and can better match other vehicle components to achieve a compact layout. Compared to assembled, welded, or spliced ​​axle housings 21, the integral cast axle housing 21 can reduce the number of parts and connection points, thereby improving the structural compactness of the axle housing 21 and reducing the overall weight.

[0103] Please see Figure 10 In some embodiments, the drive axle 200 further includes wheel-side brakes 23. The wheel-side brakes 23 are disposed at the ends of the axle housing 21. The wheel-side brakes 23 are configured to brake when the vehicle is in motion and when the vehicle is parked. This provides braking force both when the vehicle is in motion and when parked, thereby improving vehicle reliability.

[0104] Furthermore, the drive axle 200 provided in this embodiment does not require a wheel-side reduction gear mechanism, making the overall structure of the drive axle 200 compact. This drive axle 200 is suitable for small-tonnage forklifts.

[0105] For example, there are two wheel-side brakes 23, located at both ends of the axle housing 21. In this way, the two wheel-side brakes 23 brake the tires on both sides respectively, thereby avoiding the risk of single-wheel parking and improving reliability.

[0106] Specifically, the motors 12, located on both sides of the gearbox 100, are coaxially mounted and, after being reduced in speed by two transmission gear sets 13 within the gearbox 100, transmit power to two final stage gears 133. The internal splines 1331 of the two final stage gears 133 are respectively connected to the two half-shafts 22 of the drive axle 200. The output shaft of the motor 12 drives the wheels to rotate sequentially through the transmission gear sets 13 and the half-shafts 22, thereby realizing the forward and reverse movement of the vehicle. In this embodiment, no functional components for implementing parking brakes are provided on the gearbox; parking brakes are implemented by wheel-side brakes 23 located at the ends of the axle housing 21.

[0107] According to a third aspect of this application, a vehicle is provided that includes the aforementioned drive axle 200.

[0108] It is understood that the vehicle includes the aforementioned drive axle 200 and has all the beneficial effects of the aforementioned drive axle 200, which will not be repeated here.

[0109] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0110] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0111] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0112] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0113] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A gearbox (100), characterized in that, Includes a transmission unit (10), the transmission unit (10) comprising: The shell (11) has a sub-cavity (111); A motor (12) is disposed outside the housing (11), and the output shaft of the motor (12) extends into the sub-cavity (111); and A transmission gear set (13) is disposed in the sub-cavity (111), and the transmission gear set (13) is connected to the output shaft of the motor (12) for transmission. There are two speed change units (10), and the motors (12) of the two speed change units (10) are coaxially arranged, and the motors (12) of the two speed change units (10) are mirror images of each other.

2. The gearbox (100) according to claim 1, characterized in that, Along the radial symmetry plane between the two motors (12), the housings (11) of the two speed change units (10) are mirror images of each other.

3. The gearbox (100) according to claim 1, characterized in that, Along the radial symmetry plane between the two motors (12), the transmission gear sets (13) of the two speed change units (10) are mirror images of each other.

4. The gearbox (100) according to claim 1, characterized in that, The motor (12) of each of the transmission units (10) is disposed away from the other transmission unit (10), and the housings (11) of the two transmission units (10) are connected to each other.

5. The gearbox (100) according to any one of claims 1-4, characterized in that, Gear oil is provided in the sub-cavities (111) of both of the transmission units (10).

6. The gearbox (100) according to claim 5, characterized in that, The sub-cavities (111) of the two speed change units (10) are connected.

7. The gearbox (100) according to any one of claims 1-4, characterized in that, The motors (12) of both speed change units (10) are disc-type water-cooled motors (12).

8. The gearbox (100) according to any one of claims 1-4, characterized in that, The housing (11) of each of the aforementioned transmission units (10) includes: Sub-box (112), having the sub-cavity (111) and a first opening (114), the first opening (114) communicating with the sub-cavity (111); and A cover plate (113) is connected to the sub-box (112), and the cover plate (113) closes the first opening (114); In each of the speed change units (10), the motor (12) is mounted on the cover plate (113).

9. The gearbox (100) according to claim 8, characterized in that, In each of the transmission units (10), the outer wall of the sub-box (112) is provided with a second opening (115), the second opening (115) is connected to the sub-cavity (111), wherein the second opening (115) is located between the first openings (114) of the two transmission units (10); The transmission unit (10) further includes two bearing assemblies (14). In each transmission unit (10), the two bearing assemblies (14) are located on both sides of the second opening (115). The transmission gear set (13) includes a final stage gear (133). The two ends of the gear shaft (134) of the final stage gear (133) are rotatably engaged with the two bearing assemblies (14).

10. The gearbox (100) according to claim 9, characterized in that, In each of the transmission units (10), the gear shaft (134) of the final stage gear (133) is configured to be splinedly connected to the half shaft (22) of the drive axle.

11. The gearbox (100) according to claim 9, characterized in that, The motor (12) of each of the speed change units (10) is disposed away from the other speed change unit (10), and the sub-boxes (112) of the two speed change units (10) are connected to each other; The gearbox (100) also includes a flange ring (15) with its inner diameter side connected to the sub-boxes (112) of the two gearbox units (10). The flange ring (15) is arranged around the second opening (115) of the two gearbox units (10) and is configured to connect to the axle housing (21) of the drive axle (200).

12. The gearbox (100) according to claim 11, characterized in that, The sub-boxes (112) of the two transmission units (10) are integrally arranged.

13. The gearbox (100) according to claim 9, characterized in that, In each of the transmission units (10), the bearing assembly (14) includes a bearing housing (141) and an end bearing (142) mounted on the bearing housing (141). The bearing housing (141) is connected to the sub-box (112). The two ends of the gear shaft (134) of the final stage gear (133) are respectively inserted into the end bearings (142) of the two bearing assemblies (14).

14. The gearbox (100) according to claim 13, characterized in that, In each of the transmission units (10), the bearing housing (141) includes a first housing (1411) and a second housing (1412). The first housing (1411) is connected to the sub-box (112), and the second housing (1412) is detachably connected to the first housing (1411) to define a bearing mounting hole (143). The end bearing (142) is installed in the bearing mounting hole (143).

15. The gearbox (100) according to claim 14, characterized in that, In each of the transmission units (10), the end bearing (142) of a portion of the bearing assembly (14) is threaded (144) into the bearing mounting hole (143).

16. The gearbox (100) according to claim 14, characterized in that, The motor (12) of each of the transmission units (10) is disposed away from the other transmission unit (10), and the sub-boxes (112) of the two transmission units (10) are interconnected; wherein, The first seat (1411) of the two bearing assemblies (14) located between the two second openings (115) is integrally disposed with respect to the first seat (1411); and / or, The second seat (1412) of the two bearing assemblies (14) located between the two second openings (115) is integrally disposed.

17. A drive axle (200), characterized in that, include: Bridge shell (21); Two half-shafts (22) are rotatably disposed within the bridge housing (21), with the two half-shafts (22) located at opposite ends of the bridge housing (21) and rotatably connected to it; and In the gearbox (100) as described in any one of claims 1-16, the final gear (133) of the transmission gear set (13) of the two transmission units (10) is respectively connected to the two half shafts (22), and the housing (11) is connected to the axle housing (21).

18. The drive axle (200) according to claim 17, characterized in that, The bridge shell (21) is an integral casting.

19. The drive axle (200) according to claim 17, characterized in that, The drive axle (200) also includes a wheel-side brake (23) disposed at the end of the axle housing (21); the wheel-side brake (23) is configured to brake when the vehicle is in motion and when the vehicle is parked.

20. A vehicle, characterized in that, Includes the drive axle (200) as described in any one of claims 17-19.

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