Dual-motor electric power transmission system

Abstract

The utility model discloses a double-motor electric power transmission system which comprises driving motors and driving axles, the driving motors comprise a front driving motor and a rear driving motor, and the driving axles comprise a front driving axle and a rear driving axle. An output shaft of the front driving motor is connected with an input shaft of the front driving axle through a front transmission shaft or the output shaft of the front driving motor is directly connected with the input shaft of the front driving axle; and the output shaft of the rear driving motor is connected with the input shaft of the rear driving axle through a rear transmission shaft or the output shaft of the rear driving motor is directly connected with the input shaft of the rear driving axle. The power system has the advantages of being simple in structure, energy-saving and environment-friendly, reducing parts of the power system, improving the transmission efficiency and reliability of the whole vehicle and the like.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, specifically a dual-motor electric power transmission system. Background Technology

[0002] When an aircraft towing vehicle is in operation, it needs to push and tow the aircraft. Under these conditions, a large traction force is required to meet the actual working requirements. When the aircraft towing vehicle is not performing towing work, it also needs to meet the high speed requirements for turning around within the airport. Traditional aircraft towing vehicles are driven by an engine or electric motor, and power is transmitted through mechanical transmission components such as gearboxes, drive shafts, and axles. The gearbox is used to shift gears and adjust the transmission ratio to switch between high torque output and high speed output. If a four-wheel drive design is adopted, a transfer case is usually required to distribute power between the front and rear axles. Traditional transmission systems are relatively complex, with many types of parts, and due to multi-stage energy conversion and mechanical losses, the overall transmission efficiency of the vehicle is not high. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a dual-motor electric power transmission system that is simple in structure, energy-saving and environmentally friendly, reduces the number of power system components, and improves the transmission efficiency and reliability of the whole vehicle.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A dual-motor electric power transmission system, characterized in that: it includes a drive motor and a drive axle, the drive motor includes a front drive motor and a rear drive motor, the drive axle includes a front drive axle and a rear drive axle, and the output shaft of the front drive motor is connected to the input shaft of the front drive axle via a front transmission shaft or the output shaft of the front drive motor is directly connected to the input shaft of the front drive axle.

[0006] The output shaft of the rear drive motor is connected to the input shaft of the rear drive axle via the rear transmission shaft, or the output shaft of the rear drive motor is directly connected to the input shaft of the rear drive axle.

[0007] By using two sets of motors to drive the axle separately, the power system has fewer components, improving the overall vehicle transmission efficiency, reducing transmission noise, optimizing the overall vehicle layout and dynamic performance, effectively avoiding the impact and jerking caused by gear shifting in a power system with a gearbox, improving vehicle stability, and facilitating installation and maintenance. It can achieve power transmission between the drive motor and the drive axle in various ways, meeting the space requirements of different vehicle transmission systems, and has a wide range of applications, suitable for both large and small vehicles.

[0008] When the drive motor is directly connected to the drive axle, a positioning sleeve is provided around the output shaft of the drive motor and the input shaft of the drive axle. One end of the positioning sleeve is connected to the drive motor, and the other end is connected to the drive axle housing. The positioning sleeve provides positioning and stable support, reduces vibration, wear and abnormal noise, and enhances overall rigidity. At the same time, the positioning sleeve also serves as a seal and dustproof, preventing impurities from entering the connection between the output shaft of the drive motor and the input shaft of the drive axle reducer, thus extending the service life of the drive motor and the reducer.

[0009] The output shaft of the drive motor of this invention is connected to the motor end flange, and the input shaft of the drive axle reducer passes through the opening of the drive axle housing and is connected to the axle end flange. The motor end flange and the axle end flange are mated and connected by fasteners. Through the connection between the motor end flange and the axle end flange, the drive motor and the drive axle are directly connected. The structure is simple and the installation and maintenance are convenient.

[0010] The front end of the positioning sleeve of this invention is connected to the drive motor, and the rear end of the positioning sleeve is connected to the drive axle housing via fasteners; this achieves the fixation of the positioning sleeve position and facilitates installation and maintenance.

[0011] The positioning sleeve of this utility model has sleeve mounting holes at its front and rear ends, a housing connection hole on the drive motor housing, and a housing connection hole on the drive axle housing. The front end of the positioning sleeve is connected to the drive motor housing via bolts passing through the sleeve mounting hole and the housing connection hole, and the rear end of the positioning sleeve is connected to the drive axle housing via bolts passing through the sleeve mounting hole and the housing connection hole. The structure is simple and easy to install and maintain.

[0012] The present invention has a left connecting bracket fixed at the left end of the drive axle housing and a right connecting bracket fixed at the right end. The front end of the positioning sleeve is connected to the drive motor via fasteners, and the rear end face of the positioning sleeve abuts against the end face of the drive axle housing. The left rear end of the positioning sleeve is connected to the left connecting bracket, and the right rear end is connected to the right connecting bracket via fasteners. The positioning sleeve can be fixed without drilling holes at the opening of the axle housing, and the structure is simple and easy to install and maintain.

[0013] The present invention describes a drive axle housing with a left support frame at the left end and a right support frame at the right end. The drive axle is positioned relative to the vehicle frame via the left and right support frames. The front end of the positioning sleeve is connected to the drive motor housing via fasteners, and the rear end abuts against the drive axle housing. A left connecting plate extending outwards is fixed to the left side of the rear end of the positioning sleeve, and a right connecting plate extending outwards is fixed to the right side of the rear end. The left connecting plate is connected to the left support frame of the axle housing via fasteners, and the right connecting plate is connected to the right support frame of the axle housing via fasteners. This design eliminates the need for drilling holes at the axle housing opening, achieving fixed positioning of the positioning sleeve. The structure is simple, and installation and maintenance are convenient.

[0014] The drive motor described in this utility model is connected to the vehicle frame via a flexible connector. The elastic deformation of the flexible connector absorbs and isolates vibrations, preventing the high-frequency vibrations or impact loads of the motor from being directly transmitted to the vehicle frame. At the same time, it supports the motor and counteracts the bending moment of the motor's own weight and vibration on the drive axle.

[0015] The flexible connector of this utility model is fixed on the vehicle frame. A motor adjustment bracket is connected to the flexible connector. The motor adjustment bracket has an elongated hole arranged in the vertical direction. A motor connection bracket is connected to the drive motor housing. The motor adjustment bracket is connected to the motor connection bracket by bolts passing through the elongated hole. By setting the motor adjustment bracket, both pre-compression of the flexible connector and adjustment of the height of the drive motor can be achieved.

[0016] The drive motor described in this invention is connected to the vehicle frame via a height-adjustable rigid support; the supporting force of the height-adjustable rigid support counteracts the bending moment of the drive axle caused by the motor's own weight and vibration.

[0017] The beneficial effects of this utility model are as follows: by driving the axle with two sets of motors respectively, the power system has fewer parts, improving the overall vehicle transmission efficiency, reducing transmission noise, improving the overall vehicle layout optimization and the optimal matching of overall vehicle dynamic performance, effectively avoiding the impact and jerking caused by gear shifting in a power system with a gearbox, improving vehicle stability, facilitating installation and maintenance, realizing power transmission between the drive motor and the drive axle in multiple forms, meeting the space requirements of different vehicle transmission systems, and having a wide range of applications, suitable for both large and small vehicles. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0019] Figure 2 This is a top view of the overall structure of Example 1.

[0020] Figure 3 This is a schematic diagram of the connection structure between the rear drive motor and the rear axle in Embodiment 1.

[0021] Figure 4 This is the main view of the connection between the rear drive motor and the rear axle in Embodiment 1 (with the positioning sleeve hidden).

[0022] Figure 5 This is a cross-sectional view of the connection between the rear drive motor and the rear axle in Embodiment 1.

[0023] Figure 6 This is a schematic diagram of the connection between the drive motor and the rear axle in Embodiment 1.

[0024] Figure 7This is a schematic diagram of the connection between the positioning sleeve and the rear axle housing in Example 1.

[0025] Figure 8 This is a schematic diagram of the connection between the positioning sleeve and the rear axle housing in Embodiment 1 from another angle.

[0026] Figure 9 This is a schematic diagram of the rear axle housing structure in Example 1.

[0027] Figure 10 This is a schematic diagram of another structure connecting the rear drive motor and the rear axle in Embodiment 2.

[0028] Figure 11 This is a schematic diagram of the connection between the positioning sleeve and the connecting bracket in Example 2.

[0029] Figure 12 This is a schematic diagram of the connecting bracket structure on the rear axle in Example 2.

[0030] Figure 13 This is another structural diagram of the connection between the rear drive motor and the rear axle in Embodiment 3.

[0031] Figure 14 This is a schematic diagram of the connection between the positioning sleeve and the support frame via the bridge pad in Example 3.

[0032] Figure 15 This is a schematic diagram of the support frame structure on the rear axle in Example 3.

[0033] Reference numerals in the attached diagram: Frame-1, Front drive axle-2, Rear drive axle-3, Axle housing-301, Axle housing connecting hole-3011, Front drive shaft-4, Front drive motor-5, Rear drive motor-6, Positioning sleeve-7, Sleeve mounting hole-701, Left extension plate-702, Right extension plate-703, Motor connecting bracket-8, Motor adjusting bracket-9, Shock absorber-10, Motor end flange-11, Axle end flange-12, Left connecting plate-13, Right connecting plate-14, Left connecting bracket-15, Right connecting bracket-16, Axle housing left support bracket-17, Axle pad plate-1701, Connecting vertical plate-1702, Axle housing right support bracket-18. Detailed Implementation

[0034] The present invention will now be described in conjunction with the accompanying drawings and embodiments.

[0035] Example 1 (The front drive motor 5 is connected to the front drive axle 2 via the front drive shaft 4, and the rear drive motor 6 is directly connected to the rear drive axle 3. The output shaft of the rear drive motor 6 and the input shaft of the rear drive axle 3 are fitted with positioning sleeves 7):

[0036] As attached Figure 1-2As shown, a dual-motor electric power transmission system includes a drive motor and a drive axle. The drive motor includes a front drive motor 5 and a rear drive motor 6. The drive axle includes a front drive axle 2 and a rear drive axle 3. The output shaft of the front drive motor 5 is connected to the input shaft of the front drive axle 2 via a front transmission shaft 4. The output shaft of the rear drive motor 6 is directly connected to the input shaft of the rear drive axle 3.

[0037] By using two sets of motors to drive the axle separately, the power system has fewer components, improving the overall vehicle transmission efficiency, reducing transmission noise, optimizing the overall vehicle layout and dynamic performance, effectively avoiding the impact and jerking caused by gear shifting in a power system with a gearbox, improving vehicle stability, and facilitating installation and maintenance. The rear drive motor is directly connected to the rear drive axle, reducing the size of the transmission system and making it widely applicable to both large and small vehicles.

[0038] The output shaft of the rear drive motor 6 and the input shaft of the rear drive axle 3 are fitted with a positioning sleeve 7. One end of the positioning sleeve 7 is connected to the rear drive motor 6, and the other end is connected to the axle housing of the rear drive axle 3.

[0039] The positioning sleeve 7 provides positioning and stable support, reduces vibration, wear and abnormal noise, and enhances overall rigidity. At the same time, the positioning sleeve 7 also serves as a seal and dustproof, preventing impurities from entering the connection between the drive motor output shaft and the drive axle reducer input shaft, thus extending the service life of the drive motor and reducer.

[0040] As attached Figure 3-5 As shown, the output shaft of the rear drive motor 6 is connected to the motor end flange 11, and the input shaft of the reducer of the rear drive axle 3 passes through the axle housing opening of the rear drive axle 3 and is connected to the axle end flange 12. The motor end flange 11 and the axle end flange 12 are mated and connected by fasteners. Through the connection between the motor end flange 11 and the axle end flange 12, the drive motor and the drive axle are directly connected, which is simple in structure and convenient for installation and maintenance.

[0041] In this embodiment, the motor end flange 11 and the axle end flange 12 are detachably fixedly connected by bolts and nuts; the motor end flange 11 is a spline flange to ensure the efficiency of motor torque transmission and to achieve dynamic alignment and axial displacement compensation.

[0042] As attached Figure 5-9 As shown, the front end of the positioning sleeve 7 is connected to the rear drive motor 6, and the rear end of the positioning sleeve 7 is connected to the rear drive axle housing 301 via fasteners; this achieves the fixation of the position of the positioning sleeve 7 and facilitates installation and maintenance.

[0043] The positioning sleeve 7 has sleeve mounting holes 701 at its front and rear ends, a housing connection hole on the rear drive motor 6 housing, and a housing connection hole 3011 on the rear drive axle 3 housing. The front end of the positioning sleeve 7 is connected to the rear drive motor 6 housing by bolts passing through the sleeve mounting hole 701 and the housing connection hole, and the rear end of the positioning sleeve 7 is connected to the rear drive axle 3 housing 301 by bolts passing through the sleeve mounting hole 701 and the housing connection hole 3011. The structure is simple and easy to install and maintain.

[0044] In this embodiment, a plurality of sleeve mounting holes 701 are provided circumferentially on the front end face and the rear end face of the positioning sleeve 7, a plurality of housing connection holes are provided circumferentially on the housing of the rear drive motor 6, and a plurality of axle housing connection holes 3011 are provided circumferentially on the end face of the axle housing opening of the rear drive axle 3 (the reducer input shaft of the rear drive axle 3 passes through the axle housing opening). When connected, the front end face of the positioning sleeve 7 is in contact with the housing of the rear drive motor 6, the sleeve mounting holes 701 are aligned with the housing connection holes and fixed by bolts, and the rear end face of the positioning sleeve 7 is in contact with the end face of the axle housing opening of the rear drive axle 3, the sleeve mounting holes 701 are aligned with the axle housing connection holes 3011 and fixed by bolts.

[0045] In this embodiment, the housing connection hole and the axle housing connection hole 3011 can be set as threaded holes. The front end of the positioning sleeve 7 is threaded to the housing connection hole after passing through the sleeve mounting hole 701 with a bolt, and the rear end of the positioning sleeve 7 is threaded to the axle housing connection hole 3011 after passing through the sleeve mounting hole 701 with a bolt. Alternatively, the sleeve mounting hole 701 can be set as a threaded hole, the front end of the positioning sleeve 7 is threaded to the sleeve mounting hole 701 after passing through the housing connection hole with a bolt, and the rear end of the positioning sleeve 7 is threaded to the sleeve mounting hole 3011 after passing through the axle housing connection hole with a bolt. Alternatively, the inner holes of the sleeve mounting hole 701, the housing connection hole, and the axle housing connection hole 3011 can all be smooth holes, the front end of the positioning sleeve 7 is threaded to the nut after passing through the sleeve mounting hole 701 and the housing connection hole with a bolt, and the rear end of the positioning sleeve 7 is threaded to the nut after passing through the sleeve mounting hole 701 and the axle housing connection hole 3011 with a bolt. The specific connection method is not limited to these and can be set according to actual needs.

[0046] In this embodiment, the rear drive motor 6 is connected to the frame 1 via a flexible connector; the elastic deformation of the flexible connector absorbs and isolates vibrations, preventing the high-frequency vibrations or impact loads of the motor from being directly transmitted to the frame, while also supporting the motor and reducing bending moment.

[0047] The rear drive motor 6 is connected to the frame 1 at the end away from the output shaft via a pre-compressed flexible connector; the supporting force of the pre-compressed flexible connector counteracts the bending moment of the drive axle caused by the motor's own weight and vibration.

[0048] The flexible connector is fixed to the frame 1, and a motor adjustment bracket 9 is connected to the flexible connector. The motor adjustment bracket 9 has an elongated hole arranged in the vertical direction. A motor connection bracket 8 is connected to the housing of the rear drive motor 6. The motor adjustment bracket 9 is connected to the motor connection bracket 8 by bolts passing through the elongated hole. By setting the motor adjustment bracket 9, both pre-compression of the flexible connector and adjustment of the height of the rear drive motor 6 can be achieved.

[0049] In this embodiment, the motor adjustment bracket 9 includes a horizontal base plate and an adjustment vertical plate. The horizontal base plate and the adjustment vertical plate are L-shaped, and an elongated hole is opened on the adjustment vertical plate.

[0050] The flexible connector can be a shock absorber 10, an air spring, or an elastic bushing. It is not limited to these. Other flexible connectors can also be set as needed to support the motor, pre-compress it, and reduce vibration.

[0051] Alternatively, as needed, the rear drive motor 6 can be connected to the frame 1 via a height-adjustable rigid support to support the motor and reduce bending moment. The end of the rear drive motor 6 away from the output shaft is connected to the frame 1 via the height-adjustable rigid support. The supporting force of the height-adjustable rigid support counteracts the bending moment of the drive axle caused by the motor's own weight and vibration. The height-adjustable rigid support can be a hydraulic cylinder, a pneumatic cylinder, an electric push rod, an adjustable flange bracket, or a height-adjustable support rod. The extension and retraction of the height-adjustable rigid support is pre-adjusted to adjust the supporting force on the motor. The structure of the height-adjustable support rod is not limited to this; other flexible connectors can also be provided as needed to achieve height adjustment and motor support.

[0052] In this embodiment, the output shaft of the front drive motor 5 is connected to the rear end of the front drive shaft 4 via a universal joint, and the front end of the front drive shaft 4 is connected to the input shaft of the reducer of the front drive axle 2 via a universal joint. The power is transmitted from the front drive motor 5 to the front drive axle 2 via the front drive shaft 4.

[0053] In this embodiment, the front drive motor 5 is connected to the frame 1 via a flexible connector to reduce or isolate vibration.

[0054] In this embodiment, the front drive axle is connected to the frame via a suspension system, and the rear drive axle is rigidly connected to the frame. In this embodiment, the rear drive axle is rigidly connected to the frame by placing the frame 1 above the rear drive axle 3. Axle pads are provided on the left and right sides below the rear drive axle 3. The axle pads are connected to the frame 1 by bolts and nuts, which limits the rear drive axle 3 between the axle pads and the bottom surface of the frame 1, thus limiting the rear drive axle 3. In this embodiment, bolts are inserted at all four corners of the axle pad 1701 to limit the front-rear and vertical positions of the rear drive axle. The rigid connection between the rear drive axle and the frame is not limited to this. The rear drive axle and the frame can also be connected by a hydraulic locking device, bolts, or integral casting, etc., as needed.

[0055] In this embodiment, the front drive motor 5 and the rear drive motor 6 are respectively connected to the controller. The controller can be a controller developed based on MCU. The front drive motor 5 and the rear drive motor 6 are powered by the power battery pack.

[0056] When using this utility model:

[0057] The controller starts the front drive motor 5 and the rear drive motor 6. The output shaft of the front drive motor 5 rotates and transmits the rotation to the input shaft of the reducer of the front drive axle 2 via the front transmission shaft 4, driving the front wheels to walk or turn. The output shaft of the rear drive motor 6 rotates and drives the input shaft of the reducer of the rear drive axle 3 to rotate, driving the rear wheels to walk or turn. During this process, the positioning sleeve 7 is used to position the rear drive motor 6 and the rear drive axle 3 and to provide stable support for them. Flexible connectors or height-adjustable rigid supports are used to support the rear drive motor 6 and to counteract the bending moment of the motor's own weight and vibration on the drive axle.

[0058] Example 2:

[0059] The difference between Example 2 and Example 1 is as follows: Figures 10-12 As shown, a left connecting bracket 15 is fixed to the left end of the rear drive axle housing 301, and a right connecting bracket 16 is fixed to the right end. The front end of the positioning sleeve 7 is connected to the rear drive motor 6 via fasteners. The rear end face of the positioning sleeve 7 abuts against the end face of the opening of the rear drive axle housing 301. The left rear end of the positioning sleeve 7 is connected to the left connecting bracket 15, and the right rear end is connected to the right connecting bracket 16 via fasteners. The positioning sleeve 7 can be fixed without drilling holes at the opening of the axle housing. The structure is simple and easy to install and maintain.

[0060] In this embodiment, the front end face of the positioning sleeve 7 is provided with a plurality of sleeve mounting holes 701 spaced apart along the circumference, and the housing of the rear drive motor 6 is provided with a plurality of housing connecting holes spaced apart along the circumference. The left and right rear ends of the positioning sleeve 7 are provided with a plurality of sleeve mounting holes 701, and the left connecting bracket 15 and the right connecting bracket 16 are provided with bracket connecting holes. When connected, the front end face of the positioning sleeve 7 is in contact with the housing of the rear drive motor 6, the sleeve mounting holes 701 are aligned with the housing connecting holes and fixed with bolts, the rear end face of the positioning sleeve 7 is in contact with the opening of the axle housing 301 of the rear drive axle 3, the sleeve mounting holes 701 are aligned with the bracket connecting holes, the left rear end of the positioning sleeve 7 is connected to the left connecting bracket 15 by bolts passing through the sleeve mounting holes 701 and the bracket connecting holes of the left connecting bracket 15, and the right rear end of the positioning sleeve 7 is connected to the right connecting bracket 16 by bolts passing through the sleeve mounting holes 701 and the bracket connecting holes of the right connecting bracket 16.

[0061] In this embodiment, the left connecting bracket 15 and the right connecting bracket 16 each include a connecting horizontal plate and a connecting side plate. The front end of the connecting side plate is connected to the connecting horizontal plate in an L-shape, and the rear end is connected to the rear drive axle 3 housing by bolts. The bracket connecting hole is opened on the connecting horizontal plate. In order to match the position of the connecting horizontal plate, in this embodiment, the left side of the rear end of the positioning sleeve 7 extends outward with a left extension plate 702, and the right side of the rear end extends outward with a right extension plate 703. The sleeve mounting hole 701 at the rear end of the positioning sleeve 7 is opened on the left extension plate 702 and the right extension plate 703. The left extension plate 702 is connected to the connecting horizontal plate of the left connecting bracket 15, and the right extension plate 703 is connected to the connecting horizontal plate of the right connecting bracket 16.

[0062] In this embodiment, the housing connection hole and the bracket connection hole can be threaded holes. The front end of the positioning sleeve 7 is threaded to the housing connection hole after passing through the sleeve mounting hole 701 with a bolt, and the rear end of the positioning sleeve 7 is threaded to the bracket connection hole after passing through the sleeve mounting hole 701 with a bolt. Alternatively, the sleeve mounting hole 701 can be threaded, with the front end of the positioning sleeve 7 threaded to the sleeve mounting hole 701 after passing through the housing connection hole with a bolt, and the rear end of the positioning sleeve 7 threaded to the sleeve mounting hole 701 after passing through the bracket connection hole with a bolt. Alternatively, the inner holes of the sleeve mounting hole, the housing connection hole, and the bracket connection hole can all be smooth structures, with the front end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the housing connection hole with a bolt, and the rear end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the bridge housing connection hole with a bolt. The specific connection method is not limited to these and can be set according to actual needs.

[0063] The only difference between Example 2 and Example 1 is the connection structure of the positioning sleeve; other similarities will not be described in detail here.

[0064] Example 3:

[0065] The difference between Example 3 and Example 1 is as follows: Figures 13-15 As shown, the rear drive axle 3 housing 301 has a left support frame 17 at the left end and a right support frame 18 at the right end. The front end of the positioning sleeve 7 is connected to the housing of the rear drive motor 6 by fasteners, and the rear end is fitted with the opening of the rear drive axle 3 housing. A left connecting plate 13 extending outward is fixed to the left side of the rear end of the positioning sleeve 7, and a right connecting plate 14 extending outward is fixed to the right side of the rear end. The left connecting plate 13 is connected to the left support frame 17 of the housing, and the right connecting plate 14 is connected to the right support frame 18 of the housing. The positioning sleeve 7 can be fixed without drilling holes at the opening of the axle housing, which is simple in structure and convenient for installation and maintenance.

[0066] In this embodiment, the front end face of the positioning sleeve 7 is provided with a plurality of sleeve mounting holes 701 spaced apart along the circumference, the housing of the rear drive motor 6 is provided with a plurality of housing connection holes spaced apart along the circumference, the left side of the left connecting plate 13 and the right side of the right connecting plate 14 are provided with a plurality of sleeve mounting holes 701, and the left support frame 17 and the right support frame 18 of the axle housing are respectively provided with bracket connection holes; when connected, the front end face of the positioning sleeve 7 is in contact with the housing of the rear drive motor 6, the sleeve mounting holes and the housing connection holes are aligned and fixed by bolts, the rear end face of the positioning sleeve 7 is in contact with the opening of the axle housing of the rear drive axle 3, the sleeve mounting holes and the bracket connection holes are aligned, the left connecting plate 13 at the rear end of the positioning sleeve 7 is connected to the left support frame 17 of the axle housing by bolts passing through the sleeve mounting holes and the bracket connection holes, and the right connecting plate 14 at the rear end of the positioning sleeve 7 is connected to the right support frame 18 of the axle housing by bolts passing through the sleeve mounting holes and the bracket connection holes.

[0067] The left support frame 17 and the right support frame 18 of the axle housing respectively include a bridge pad plate 1701 and a vertical plate 1702. The lower end of the vertical plate 1702 is connected to the bridge pad plate 1701. The end of the left connecting plate 13 away from the positioning sleeve 7 is connected to the vertical plate of the left support frame 17 of the axle housing. The end of the right connecting plate 14 away from the positioning sleeve 7 is connected to the vertical plate of the right support frame 18 of the axle housing.

[0068] The left connecting plate 13 and the right connecting plate 14 are configured as arc-shaped plates with openings facing the rear drive axle 3; the left connecting plate 13 and the right connecting plate 14 are configured as arc-shaped plates to facilitate connection with the left support frame 17 and the right support frame 18 of the axle housing.

[0069] In this embodiment, the frame 1 is located above the rear drive axle 3, and the axle pad 1701 is located below the rear drive axle 3. The axle pad 1701 and the frame 1 are connected by bolts and nuts, so that the rear drive axle 3 is limited between the axle pad 1701 and the bottom surface of the frame 1. In this embodiment, bolts are inserted at all four corners of the axle pad 1701 to limit the front-rear and vertical positions of the rear drive axle. The axle housing left support frame 17 and the axle housing right support frame 18 not only limit the rear drive axle 3, but also connect it to the positioning sleeve 7. In this embodiment, the front drive axle 2 is connected to the frame 1 through the suspension system.

[0070] In this embodiment, the housing connection hole and the bracket connection hole can be threaded holes. The front end of the positioning sleeve 7 is threaded to the housing connection hole after passing through the sleeve mounting hole 701 with a bolt, and the rear end of the positioning sleeve 7 is threaded to the bracket connection hole after passing through the sleeve mounting hole 701 with a bolt. Alternatively, the sleeve mounting hole 701 can be threaded, with the front end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the housing connection hole with a bolt, and the rear end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the bracket connection hole with a bolt. Alternatively, the inner holes of the sleeve mounting hole, the housing connection hole, and the bracket connection hole can all be smooth structures, with the front end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the housing connection hole with a bolt, and the rear end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the bracket connection hole with a bolt. The specific connection method is not limited to these and can be set according to actual needs.

[0071] In this embodiment, the left connecting plate 13 and the right connecting plate 14 can be welded to the positioning sleeve 7 or integrally formed.

[0072] The only difference between Example 3 and Example 1 is the connection structure of the positioning sleeve; other similarities will not be described in detail here.

[0073] Example 4 (The rear drive motor 5 is connected to the rear drive axle 3 via the rear transmission shaft, the front drive motor 5 is directly connected to the front drive axle 2, and the output shaft of the front drive motor 5 and the input shaft of the front drive axle 2 are fitted with positioning sleeves 7):

[0074] A dual-motor electric power transmission system includes a drive motor and a drive axle. The drive motor includes a front drive motor 5 and a rear drive motor 6. The drive axle includes a front drive axle 2 and a rear drive axle 3. The output shaft of the rear drive motor 6 is connected to the input shaft of the rear drive axle 3 via a rear transmission shaft. The output shaft of the front drive motor 5 is directly connected to the input shaft of the front drive axle 2.

[0075] In this embodiment, the output shaft of the front drive motor 5 and the input shaft of the front drive axle 2 are fitted with a positioning sleeve 7. One end of the positioning sleeve 7 is connected to the front drive motor 5, and the other end is connected to the axle housing of the front drive axle 2.

[0076] The output shaft of the front drive motor 5 is connected to the motor end flange, and the input shaft of the reducer of the front drive axle 2 passes through the opening of the axle housing of the front drive axle 2 and is connected to the axle end flange. The motor end flange and the axle end flange are mated and connected by fasteners. Through the connection between the motor end flange and the axle end flange, the drive motor and the drive axle are directly connected, which is simple in structure and convenient for installation and maintenance.

[0077] In this embodiment, the motor end flange and the axle end flange are detachably fixedly connected by bolts and nuts; the motor end flange is a spline flange to ensure the efficiency of motor torque transmission, achieve dynamic alignment and axial displacement compensation.

[0078] In this embodiment, the front end of the positioning sleeve 7 is connected to the front drive axle 2 housing and the rear end is connected to the front drive motor 5 via fasteners; thus, the position of the positioning sleeve 7 is fixed, and installation and maintenance are convenient.

[0079] The positioning sleeve 7 has sleeve mounting holes at its front and rear ends, a housing connection hole on the front drive motor 5 housing, and a housing connection hole on the front drive axle 2 housing. The front end of the positioning sleeve 7 is connected to the front drive axle 2 housing by bolts passing through the sleeve mounting hole and the housing connection hole, and the rear end of the positioning sleeve 7 is connected to the front drive motor 5 housing by bolts passing through the sleeve mounting hole and the housing connection hole. The structure is simple and easy to install and maintain.

[0080] In this embodiment, a plurality of sleeve mounting holes are provided circumferentially on the front end face and the rear end face of the positioning sleeve 7, a plurality of housing connection holes are provided circumferentially on the housing of the front drive motor 5, and a plurality of axle housing connection holes are provided circumferentially on the end face of the axle housing opening of the front drive axle 2 (the reducer input shaft of the front drive axle 2 passes through the axle housing opening). When connected, the rear end face of the positioning sleeve 7 is in contact with the housing of the front drive motor 5, the sleeve mounting holes and the housing connection holes are aligned and fixed with bolts, and the front end face of the positioning sleeve 7 is in contact with the end face of the axle housing opening of the front drive axle 2, the sleeve mounting holes and the axle housing connection holes are aligned and fixed with bolts.

[0081] In this embodiment, the housing connection hole and the axle housing connection hole can be threaded holes. The front end of the positioning sleeve 7 is threaded to the axle housing connection hole after passing through the sleeve mounting hole with a bolt, and the rear end of the positioning sleeve 7 is threaded to the housing connection hole after passing through the sleeve mounting hole with a bolt. Alternatively, the sleeve mounting hole can be threaded, with the front end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the axle housing connection hole with a bolt, and the rear end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the housing connection hole with a bolt. Alternatively, the inner holes of the sleeve mounting hole, the housing connection hole, and the axle housing connection hole can all be smooth holes, with the rear end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the housing connection hole with a bolt, and the front end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the axle housing connection hole with a bolt. The specific connection method is not limited to these and can be set according to actual needs.

[0082] In this embodiment, the front drive motor 5 is connected to the frame 1 via a flexible connector; the elastic deformation of the flexible connector absorbs and isolates vibrations, preventing the high-frequency vibrations or impact loads of the motor from being directly transmitted to the frame, while also supporting the motor and reducing bending moment.

[0083] The end of the front drive motor 5 away from the output shaft is connected to the frame 1 via a pre-compressed flexible connector; the supporting force of the pre-compressed flexible connector counteracts the bending moment of the drive axle caused by the motor's own weight and vibration.

[0084] The flexible connector is fixed to the frame 1. A motor adjustment bracket is connected to the flexible connector. The motor adjustment bracket has an elongated hole arranged in the vertical direction. A motor connection bracket is connected to the housing of the front drive motor 5. The motor adjustment bracket is connected to the motor connection bracket by bolts passing through the elongated hole. By setting the motor adjustment bracket, the flexible connector can be pre-compressed and the height of the rear drive motor can be adjusted in conjunction with the flexible connector.

[0085] In this embodiment, the motor adjustment bracket includes a horizontal base plate and an adjustment vertical plate. The horizontal base plate and the adjustment vertical plate are L-shaped, and an elongated hole is opened on the adjustment vertical plate.

[0086] The flexible connector can be a shock absorber 10, an air spring, or an elastic bushing. It is not limited to these. Other flexible connectors can also be set as needed to support the motor, pre-compress it, and reduce vibration.

[0087] Alternatively, as needed, the front drive motor 5 can be connected to the frame 1 via a height-adjustable rigid support to support the motor and reduce bending moment. The end of the front drive motor 5 away from the output shaft is connected to the frame 1 via the height-adjustable rigid support. The supporting force of the height-adjustable rigid support counteracts the bending moment of the drive axle caused by the motor's own weight and vibration. The height-adjustable rigid support can be a hydraulic cylinder, a pneumatic cylinder, an electric push rod, an adjustable flange bracket, or a height-adjustable support rod. The extension and retraction of the height-adjustable rigid support is pre-adjusted to adjust the supporting force on the motor. The structure of the height-adjustable support rod is not limited to this; other flexible connectors can also be provided as needed to achieve height adjustment and motor support.

[0088] In this embodiment, the output shaft of the rear drive motor 6 is connected to the front end of the rear transmission shaft via a universal joint, and the rear end of the rear transmission shaft is connected to the input shaft of the reducer of the rear drive axle 3 via a universal joint. The power is transmitted to the rear drive axle 3 via the rear drive motor 6 through the rear transmission shaft.

[0089] In this embodiment, the rear drive motor 6 is connected to the frame 1 via a flexible connector, which can reduce and isolate vibration.

[0090] In this embodiment, the rear drive axle is connected to the frame via the suspension system, and the front drive axle is rigidly connected to the frame. In this embodiment, the rigid connection between the front drive axle 2 and the frame 1 is such that the frame 1 is located above the front drive axle 2, and axle pads are provided on the left and right sides below the front drive axle 2. The axle pads and the frame 1 are connected by bolts and nuts, so that the front drive axle 2 is limited between the axle pads and the bottom surface of the frame 1, thus limiting the front drive axle 2. In this embodiment, bolts are inserted at the four corners of the axle pads to limit the front drive axle's front-rear and vertical positions. The rigid connection between the front drive axle and the frame is not limited to this. It can also be set to connect the front drive axle and the frame through a hydraulic locking device, bolts, or integral casting, etc., as needed.

[0091] In this embodiment, the structures of the front drive axle and the rear drive axle are existing technologies, including axle housing, reducer, differential, half shaft, etc., which will not be described in detail here.

[0092] In this embodiment, the front drive motor 5 and the rear drive motor 6 are respectively connected to the controller, which can be a controller developed based on MCU.

[0093] The front drive motor 5 and the rear drive motor 6 are powered by a power battery pack.

[0094] When using this utility model:

[0095] The controller starts the front drive motor 5 and the rear drive motor 6. The output shaft of the rear drive motor 6 rotates and transmits the rotation to the input shaft of the reducer of the rear drive axle 3 via the rear transmission shaft, driving the rear wheels to walk or turn. The output shaft of the front drive motor 5 rotates and drives the input shaft of the reducer of the front drive axle 2 to rotate, driving the front wheels to walk or turn. During this process, the positioning sleeve 7 is used to position the front drive motor 5 and the front drive axle 2 and to provide stable support for them. Flexible connectors or height-adjustable rigid supports are used to support the front drive motor 5 and counteract the bending moment of the motor's own weight and vibration on the drive axle.

[0096] Example 5:

[0097] The difference between Embodiment 5 and Embodiment 4 is that a left connecting bracket is fixed to the left end of the front drive axle 2 housing, and a right connecting bracket is fixed to the right end. The rear end of the positioning sleeve 7 is connected to the front drive motor 5 via fasteners. The front end face of the positioning sleeve 7 abuts against the end face of the opening of the front drive axle housing. The left front end of the positioning sleeve 7 is connected to the left connecting bracket, and the right front end of the positioning sleeve 7 is connected to the right connecting bracket via fasteners. It is possible to fix the position of the positioning sleeve 7 without drilling holes at the opening of the axle housing. The structure is simple and easy to install and maintain.

[0098] In this embodiment, the rear end face of the positioning sleeve 7 is provided with a plurality of sleeve mounting holes spaced apart circumferentially, and the housing of the front drive motor 5 is provided with a plurality of housing connection holes spaced apart circumferentially. The left and right front ends of the positioning sleeve 7 are provided with a plurality of sleeve mounting holes, and the left and right connecting brackets are provided with bracket connection holes. During connection, the rear end face of the positioning sleeve 7 is in contact with the housing of the front drive motor 5, the sleeve mounting holes and housing connection holes are aligned and fixed with bolts, the front end face of the positioning sleeve 7 is in contact with the opening of the axle housing of the front drive axle 2, the sleeve mounting holes and bracket connection holes are aligned, the left front end of the positioning sleeve 7 is connected to the left connecting bracket by bolts passing through the sleeve mounting holes and the bracket connection holes of the left connecting bracket, and the right front end of the positioning sleeve 7 is connected to the right connecting bracket by bolts passing through the sleeve mounting holes and the bracket connection holes of the right connecting bracket.

[0099] In this embodiment, the left connecting bracket and the right connecting bracket each include a connecting horizontal plate and a connecting side plate. The rear end of the connecting side plate is connected to the connecting horizontal plate in an L-shape, and the front end is connected to the front drive axle 2 housing by bolts. The bracket connecting hole is opened on the connecting horizontal plate. In order to match the position of the connecting horizontal plate, in this embodiment, the left side of the front end of the positioning sleeve 7 extends outward with a left extension plate, and the right side of the front end extends outward with a right extension plate. The sleeve mounting hole at the front end of the positioning sleeve 7 is opened on the left extension plate and the right extension plate. The left extension plate is connected to the connecting horizontal plate of the left connecting bracket, and the right extension plate is connected to the connecting horizontal plate of the right connecting bracket.

[0100] In this embodiment, the housing connection hole and the bracket connection hole can be threaded holes. The rear end of the positioning sleeve 7 is threaded to the housing connection hole after passing through the sleeve mounting hole with a bolt, and the front end of the positioning sleeve 7 is threaded to the bracket connection hole after passing through the sleeve mounting hole with a bolt. Alternatively, the sleeve mounting hole can be threaded, with the rear end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the housing connection hole with a bolt, and the front end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the bracket connection hole with a bolt. Alternatively, the inner holes of the sleeve mounting hole, the housing connection hole, and the bracket connection hole can all be smooth structures, with the rear end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the housing connection hole with a bolt, and the front end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and the bridge housing connection hole with a bolt. The specific connection method is not limited to these and can be set according to actual needs.

[0101] The only difference between Example 5 and Example 4 is the connection structure of the positioning sleeve; other similarities will not be described in detail here.

[0102] In this embodiment, the rear drive axle is connected to the vehicle frame via a suspension system, while the front drive axle is rigidly connected to the vehicle frame.

[0103] Example 6:

[0104] The difference between Embodiment 6 and Embodiment 4 is that the left end of the front drive axle 2 housing is provided with a left support frame and the right end with a right support frame. The rear end of the positioning sleeve 7 is connected to the housing of the front drive motor 5 by fasteners, and the front end is fitted with the opening of the front drive axle 2 housing. A left connecting plate extending outward is fixed to the left side of the front end of the positioning sleeve 7, and a right connecting plate extending outward is fixed to the right side of the front end. The left connecting plate is connected to the left support frame of the axle housing, and the right connecting plate is connected to the right support frame of the axle housing. It is possible to fix the position of the positioning sleeve 7 without drilling holes at the opening of the axle housing, which is simple in structure and convenient for installation and maintenance.

[0105] In this embodiment, the rear end face of the positioning sleeve 7 is provided with a plurality of sleeve mounting holes spaced apart circumferentially, the housing of the front drive motor 5 is provided with a plurality of housing connection holes spaced apart circumferentially, the left side of the left connecting plate and the right side of the right connecting plate are provided with a plurality of sleeve mounting holes, and the left support frame and the right support frame of the axle housing are provided with bracket connection holes respectively. When connected, the rear end face of the positioning sleeve 7 is in contact with the housing of the front drive motor 5, the sleeve mounting holes and the housing connection holes are aligned and fixed with bolts, the front end face of the positioning sleeve 7 is in contact with the opening of the axle housing of the front drive axle 2, the sleeve mounting holes and the bracket connection holes are aligned, the left connecting plate at the front end of the positioning sleeve 7 is connected to the left support frame of the axle housing by bolts passing through the sleeve mounting holes and the bracket connection holes, and the right connecting plate 14 at the front end of the positioning sleeve 7 is connected to the right support frame of the axle housing by bolts passing through the sleeve mounting holes and the bracket connection holes.

[0106] The left and right support frames of the axle housing each include a bridge pad plate and a vertical plate. The lower end of the vertical plate is connected to the bridge pad plate. The end of the left connecting plate away from the positioning sleeve is connected to the vertical plate of the left support frame of the axle housing. The end of the right connecting plate away from the positioning sleeve is connected to the vertical plate of the right support frame of the axle housing.

[0107] The left and right connecting plates are configured as arc-shaped plates with openings facing the front drive axle 2; the left and right connecting plates are configured as arc-shaped plates to facilitate connection with the left support frame and the right support frame of the axle housing.

[0108] In this embodiment, the frame 1 is located above the front drive axle 2, and the axle pad is located below the front drive axle 2. The axle pad and the frame 1 are connected by bolts and nuts, so that the front drive axle 2 is limited between the axle pad and the bottom surface of the frame 1. In this embodiment, bolts are inserted at the four corners of the axle pad to limit the front, rear and vertical positions of the rear drive axle. The setting of the left and right axle housing support frames not only limits the front drive axle 2, but also connects it to the positioning sleeve 7. In this embodiment, the rear drive axle is connected to the frame through the suspension system.

[0109] In this embodiment, the housing connection hole and the bracket connection hole can be threaded holes. The rear end of the positioning sleeve 7 is threaded to the housing connection hole after passing through the sleeve mounting hole with a bolt, and the front end of the positioning sleeve 7 is threaded to the bracket connection hole after passing through the sleeve mounting hole with a bolt. Alternatively, the sleeve mounting hole can be threaded, with the rear end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the housing connection hole with a bolt, and the front end of the positioning sleeve 7 threaded to the sleeve mounting hole after passing through the bracket connection hole with a bolt. Alternatively, the inner holes of the sleeve mounting hole, housing connection hole, and bracket connection hole can all be smooth structures, with the rear end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and housing connection hole with a bolt, and the front end of the positioning sleeve 7 threaded to the nut after passing through the sleeve mounting hole and bracket connection hole with a bolt. The specific connection method is not limited to these and can be set according to actual needs.

[0110] In this embodiment, the left connecting plate and the right connecting plate can be welded to the positioning sleeve 7 or integrally formed.

[0111] The only difference between Example 6 and Example 4 is the connection structure of the positioning sleeve; other similarities will not be described in detail here.

[0112] Example 7 (Front drive motor 5 is connected to front drive axle 2 via front drive shaft 4, and rear drive motor 6 is connected to rear drive axle 3 via rear drive shaft):

[0113] A dual-motor electric power transmission system includes a drive motor and a drive axle. The drive motor includes a front drive motor 5 and a rear drive motor 6. The drive axle includes a front drive axle 2 and a rear drive axle 3. The output shaft of the front drive motor 5 is connected to the input shaft of the front drive axle 2 via a front transmission shaft 4. The output shaft of the rear drive motor 6 is connected to the input shaft of the rear drive axle 3 via a rear transmission shaft.

[0114] In this embodiment, the output shaft of the front drive motor 5 is connected to the rear end of the front drive shaft 4 via a universal joint, and the front end of the front drive shaft 4 is connected to the input shaft of the front drive axle 2 reducer via a universal joint. The power is transmitted from the front drive motor 5 to the front drive axle 2 via the front drive shaft 4.

[0115] The output shaft of the rear drive motor 6 is connected to the front end of the rear transmission shaft via a universal joint, and the rear end of the rear transmission shaft is connected to the input shaft of the reducer of the rear drive axle 3 via a universal joint. The power is transmitted to the rear drive axle 3 via the rear drive motor 6 through the rear transmission shaft.

[0116] In this embodiment, the front drive motor 5 and the rear drive motor 6 are connected to the frame 1 via flexible connectors. The flexible connectors can be shock absorbers, air springs, or elastic bushings to reduce or isolate vibrations.

[0117] In this embodiment, the front drive axle and the rear drive axle are connected to the vehicle frame via the suspension system.

[0118] In this embodiment, the front drive motor 5 and the rear drive motor 6 are respectively connected to the controller, which can be a controller developed based on MCU.

[0119] The front drive motor 5 and the rear drive motor 6 are powered by a power battery pack.

[0120] When using this utility model:

[0121] The controller starts the front drive motor 5 and the rear drive motor 6. The output shaft of the rear drive motor 6 rotates and is transmitted to the input shaft of the reducer of the rear drive axle 3 via the rear transmission shaft, driving the rear wheels to move or turn. The output shaft of the front drive motor 5 rotates and is transmitted to the input shaft of the reducer of the front drive axle 2 via the front transmission shaft, driving the front wheels to move or turn.

[0122] Example 8 (The front drive motor 5 is directly connected to the front drive axle 2, and the rear drive motor 6 is directly connected to the rear drive axle 3. Positioning sleeves 7 are respectively fitted around the output shaft of the front drive motor 5 and the input shaft of the front drive axle 2, and the output shaft of the rear drive motor 6 and the input shaft of the rear drive axle 3):

[0123] A dual-motor electric power transmission system includes a drive motor and a drive axle. The drive motor includes a front drive motor 5 and a rear drive motor 6. The drive axle includes a front drive axle 2 and a rear drive axle 3. The output shaft of the front drive motor 5 is directly connected to the input shaft of the front drive axle 2, and the output shaft of the rear drive motor 6 is directly connected to the input shaft of the rear drive axle 3.

[0124] By using two sets of motors to drive the axles separately, the power system has fewer components, improving overall vehicle transmission efficiency, reducing transmission noise, optimizing vehicle layout and dynamic performance, effectively avoiding the impact and jerking caused by gear shifting in a power system with a gearbox, improving vehicle stability, and facilitating installation and maintenance. With the front drive motor directly connected to the front drive axle and the rear drive motor directly connected to the rear drive axle, the size of the transmission system is reduced, making it widely applicable to both large and small vehicles.

[0125] The structure of the positioning sleeve 7 between the output shaft of the rear drive motor 6 and the input shaft of the reducer of the rear drive axle 3, as well as its connection relationship with the rear drive motor 6 and the rear drive axle 3, can be found in the specific structures of Embodiments 1, 2, and 3. The structure of the positioning sleeve between the output shaft of the front drive motor 5 and the input shaft of the reducer of the front drive axle 2, as well as its connection relationship with the front drive motor 5 and the front drive axle 2, can be found in the specific structures of Embodiments 4, 5, and 6.

[0126] In this embodiment, the front drive axle and rear drive axle are rigidly connected to the vehicle frame. The rigid connection between the front drive axle and the frame is such that the vehicle frame 1 is positioned above the front drive axle 2. Axle pads are located on the left and right sides below the front drive axle 2. The axle pads are connected to the vehicle frame 1 via bolts and nuts, thus limiting the front drive axle 2 between the axle pads and the bottom surface of the vehicle frame 1. In this embodiment, bolts are inserted at all four corners of the axle pads to limit the front drive axle's front-rear and vertical positions. The rigid connection between the front drive axle and the frame is not limited to this; it can also be configured to connect the front drive axle and the frame via a hydraulic locking device or a [other method] as needed. The rear drive axle can be connected by bolts or integral casting, etc.; the rigid connection between the rear drive axle and the frame is such that the frame 1 is located above the rear drive axle 3, and axle pads are provided on the left and right sides below the rear drive axle 3. The axle pads and the frame 1 are connected by bolts and nuts, so that the rear drive axle 3 is limited between the axle pads and the bottom surface of the frame 1, thereby limiting the position of the rear drive axle 3. In this embodiment, bolts are inserted at the four corners of the axle pads to limit the front-rear and vertical positions of the rear drive axle. The rigid connection between the rear drive axle and the frame is not limited to this. The rear drive axle and the frame can also be connected by a hydraulic locking device, bolts, or integral casting, etc., as needed.

[0127] In this embodiment, the front drive motor 5 and the rear drive motor 6 are respectively connected to the controller, which can be a controller developed based on MCU.

[0128] The front drive motor 5 and the rear drive motor 6 are powered by a power battery pack.

[0129] When using this utility model:

[0130] The controller starts the front drive motor 5 and the rear drive motor 6. The output shaft of the rear drive motor 6 rotates, which drives the input shaft of the reducer of the rear drive axle 3 to rotate, driving the rear wheels to walk or turn. The output shaft of the front drive motor 5 rotates, which drives the input shaft of the reducer of the front drive axle 2 to rotate, driving the front wheels to walk or turn. During this process, the front drive motor 5 and the front drive axle 2, and the rear drive motor 6 and the rear drive axle 3 are positioned and stabilized by positioning sleeves, respectively. The front drive motor 5 and the rear drive motor 6 are supported by flexible connectors or height-adjustable rigid supports, respectively, to counteract the bending moment of the drive axle caused by the motor's own weight and vibration.

[0131] The dual-motor electric power transmission system in the above embodiments is applicable to various vehicles such as tractors and loaders.

Claims

1. A dual-motor electrically variable powertrain system, characterized by: The drive motor comprises a front drive motor and a rear drive motor, and the drive bridge comprises a front drive bridge and a rear drive bridge; the output shaft of the front drive motor is connected with the input shaft of the front drive bridge through a front transmission shaft, or the output shaft of the front drive motor is directly connected with the input shaft of the front drive bridge; the output shaft of the rear drive motor is connected with the input shaft of the rear drive bridge through a rear transmission shaft, or the output shaft of the rear drive motor is directly connected with the input shaft of the rear drive bridge.

2. A dual motor electrically variable power transmission system as in claim 1, wherein: When the drive motor is directly connected with the drive bridge, the output shaft of the drive motor and the input shaft of the drive bridge are sleeved with a positioning sleeve, one end of the positioning sleeve is connected with the drive motor, and the other end is connected with the drive bridge housing.

3. A dual motor electrically variable power transmission system as claimed in claim 2, characterised in that: The output shaft of the drive motor is connected with a motor end flange, the input shaft of the drive bridge reducer passes through an opening of the drive bridge housing and is connected with a vehicle axle end flange, the motor end flange is butted with the vehicle axle end flange and is connected through a fastener.

4. A dual-motor electrically variable power transmission system as claimed in claim 2 or 3, characterised in that: The front end of the positioning sleeve and the rear end of the drive bridge housing are connected through a fastener.

5. A dual-motor electrically variable power transmission system as recited in claim 4, characterized by: The front end and the rear end of the positioning sleeve are respectively provided with sleeve mounting holes, the drive motor housing is provided with a housing connecting hole, and the drive bridge housing is provided with a bridge housing connecting hole; the front end of the positioning sleeve is connected with the drive motor housing through bolts passing through the sleeve mounting hole and the housing connecting hole, and the rear end of the positioning sleeve is connected with the drive bridge housing through bolts passing through the sleeve mounting hole and the bridge housing connecting hole.

6. A dual-motor electrically variable power transmission system as claimed in claim 2 or 3, characterised in that: The left end of the drive bridge housing is fixed with a left connecting support, and the right end is fixed with a right connecting support; the front end of the positioning sleeve is connected with the drive motor through a fastener, and the rear end surface of the positioning sleeve is abutted with the end surface of the drive bridge housing; the left side of the rear end of the positioning sleeve is connected with the left connecting support through a fastener, and the right side of the rear end of the positioning sleeve is connected with the right connecting support through a fastener.

7. A dual-motor electrically variable power transmission system as claimed in claim 2 or 3, characterised in that: The left end of the drive bridge housing is provided with a bridge housing left support frame, and the right end is provided with a bridge housing right support frame; the drive bridge is limited by the bridge housing left support frame and the bridge housing right support frame; the front end of the positioning sleeve is connected with the drive motor housing through a fastener, and the rear end is abutted with the drive bridge housing; the left side of the rear end of the positioning sleeve is fixed with an outwardly extending left connecting plate, and the right side of the rear end of the positioning sleeve is fixed with an outwardly extending right connecting plate; the left connecting plate is connected with the bridge housing left support frame through a fastener, and the right connecting plate is connected with the bridge housing right support frame through a fastener.

8. A dual motor electrically variable power transmission system as claimed in claim 2 or 3 or 5 wherein: The drive motor is connected with the vehicle frame through a flexible connecting piece.

9. A dual-motor electrically variable power transmission system as recited in claim 8, characterized by: The flexible connecting piece is fixed on the vehicle frame, a motor adjusting support is connected on the flexible connecting piece, a long slot hole arranged in a vertical direction is formed on the motor adjusting support, a motor connecting support is connected on the drive motor housing, and the motor adjusting support is connected with the motor connecting support through bolts passing through the long slot hole.

10. A dual motor electrically variable power transmission system as claimed in claim 2 or 3 or 5 wherein: The drive motor is connected with the vehicle frame through a height-adjustable rigid support.

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