Electric power transmission system

Abstract

The utility model discloses an electric power transmission system which comprises a drive motor and a drive axle, an output shaft of the drive motor is directly connected with an input shaft of the drive axle, a positioning sleeve is sleeved outside the output shaft of the drive motor and the input shaft of the drive axle, one end of the positioning sleeve is connected with the drive motor, and the other end of the positioning sleeve is connected with the drive axle. The transmission device has the advantages that the structure is simple, energy is saved, the environment is protected, parts of a power system are reduced, and the transmission efficiency and reliability of the whole vehicle are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric vehicle technical field, specifically is a kind of electric power transmission system. BACKGROUND

[0002] When aircraft tractor works, it needs to push and tow aircraft, and in this working condition, it needs great traction to meet the actual working condition demand, and when aircraft tractor does not work, it also needs to meet the higher vehicle speed working condition demand in the airport internal turnover;Traditional aircraft tractor is driven by engine or motor, and power is transmitted through mechanical transmission components such as gearbox, transmission shaft and axle, gear shifting is realized through gearbox, transmission ratio is adjusted, and switching between large torque output and high speed output is realized;Traditional transmission system is relatively complex, and there are many types of parts, and due to multi-stage energy conversion and mechanical loss, the transmission efficiency of the whole vehicle is not high. INVENTION CONTENTS

[0003] The utility model discloses a kind of electric power transmission systems with simple structure, energy saving and environmental protection, reduce power system parts, improve the transmission efficiency and reliability of whole vehicle.

[0004] The utility model discloses the technical scheme for solving technical problems thereof is as follows:

[0005] An electric power transmission system, characterized in that: including drive motor and drive axle, the output shaft of drive motor is directly connected with the input shaft of drive axle;

[0006] The output shaft of drive motor and the input shaft of drive axle are provided with positioning sleeve, one end of the positioning sleeve is connected with drive motor, and the other end is connected with drive axle housing;

[0007] Drive motor directly drives drive axle, transmission system is simple in structure, and there are few parts, the transmission efficiency of whole vehicle is high, and the use reliability is high, can realize stepless speed change, effectively avoids the impact and the jerk caused by gear shifting of power system with gearbox, improves vehicle stability, is easy to install and maintain, and the size space of transmission system is reduced, and the application range is wide, whether it is large vehicle or small vehicle can be applicable, positioning sleeve is arranged to realize positioning and stable support, reduce vibration, wear and abnormal sound, enhance overall rigidity, meanwhile, positioning sleeve also plays the role of sealing and dustproof, prevent impurities from entering the connection between drive motor output shaft and drive axle reducer input shaft, prolong the service life of drive motor and reducer.

[0008] The utility model discloses drive motor's output shaft is connected with motor end flange, drive axle decelerator's input shaft is connected with axle end flange through drive axle axle housing opening, and motor end flange is connected with axle end flange through fastener, and the connection of motor end flange and axle end flange realizes the direct connection of drive motor and drive axle, and the simple structure is convenient for installation and maintenance.

[0009] The front end of the positioning sleeve is connected with the drive motor through a fastener, and the rear end of the positioning sleeve is connected with the drive axle housing through a fastener.

[0010] 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, the drive axle housing is provided with an axle housing connecting hole, the front end of the positioning sleeve is connected with the drive motor housing through a bolt passing through the sleeve mounting hole and the housing connecting hole, and the rear end of the positioning sleeve is connected with the drive axle housing through a bolt passing through the sleeve mounting hole and the axle housing connecting hole.

[0011] The left end of the drive axle housing is fixedly provided with a left connecting support, and the right end is fixedly provided with a right connecting support, the front end of the positioning sleeve is connected with the drive motor through a fastener, the rear end surface of the positioning sleeve is abutted with the end surface of the drive axle housing, and 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.

[0012] The left side and the right side of the rear end of the positioning sleeve are respectively provided with sleeve mounting holes, the left connecting support and the right connecting support are respectively provided with support connecting holes, the left side of the rear end of the positioning sleeve is connected with the left connecting support through a bolt passing through the sleeve mounting hole and the support connecting hole of the left connecting support, and the right side of the rear end of the positioning sleeve is connected with the right connecting support through a bolt passing through the sleeve mounting hole and the support connecting hole of the right connecting support.

[0013] The left end of the drive axle housing is provided with an axle housing left supporting frame, and the right end is provided with an axle housing right supporting frame, the drive axle is limited by the axle housing left supporting frame and the axle housing right supporting frame and the vehicle 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 axle housing, the left side of the rear end of the positioning sleeve is fixedly provided with an outwardly extending left connecting plate, and the right side of the rear end is fixedly provided with an outwardly extending right connecting plate, the left connecting plate is connected with the axle housing left supporting frame, and the right connecting plate is connected with the axle housing right supporting frame.

[0014] The utility model discloses a drive motor is connected with the frame through the flexible connecting piece, and the flexible connecting piece is connected with the frame, and the flexible connecting piece is connected with the frame through the flexible connecting piece.

[0015] The utility model discloses a flexible connecting piece is fixed on the frame, be connected with motor adjusting support on the flexible connecting piece, be equipped with the long hole of arranging along the vertical direction on the motor adjusting support, be connected with motor connecting support on the drive motor casing, and the motor adjusting support is connected with motor connecting support through bolt through the long hole, through setting up motor adjusting support, can realize the precompression of flexible connecting piece again and can cooperate flexible connecting piece and adjust the height of drive motor.

[0016] The utility model discloses a drive motor is connected with the frame through the height adjustable rigid support, and the height adjustable rigid support is connected with the frame.

[0017] The utility model discloses a drive motor directly drives the drive axle, and the transmission system structure is simple, and the parts are few, and the whole vehicle transmission efficiency is high, and the use reliability is high, can realize stepless speed change, effectively avoids the impact and the jerk feeling of gear shifting of power system with gearbox, improves the vehicle stability, and the installation and maintenance are convenient, and the size space of transmission system is reduced, and the application scope is wide, and no matter is large -scale vehicle or small -size vehicle can be applicable, and the setting of positioning sleeve realizes positioning and stable support, reduces vibration, abrasion and abnormal sound, enhances the overall rigidity, and positioning sleeve also plays the role of sealing and dustproof, prevents the impurity from entering the connecting place of drive motor output shaft and drive axle speed reducer input shaft, prolongs the service life of drive motor and speed reducer, and the flexible connecting piece or height adjustable rigid support sets up, and the bending moment of drive axle of motor self weight and vibration is offset. ACCURACY OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic diagram of the utility model.

[0019] Figure 2 It is the whole structure plan view of the utility model.

[0020] Figure 3 It is the embodiment 1 rear drive motor and rear axle connection structure schematic diagram.

[0021] Figure 4 It is the embodiment 1 rear drive motor and rear axle connection main view ( hides positioning sleeve).

[0022] Figure 5 It is the embodiment 1 rear drive motor and rear axle connection section view.

[0023] Figure 6 is the schematic diagram of the rear drive motor and the rear axle connection of example 1.

[0024] Figure 7 is the schematic diagram of the positioning sleeve and the rear axle housing connection of example 1.

[0025] Figure 8 is the schematic diagram of the positioning sleeve and the rear axle housing connection of example 1 from another angle.

[0026] Figure 9 is the schematic diagram of the rear axle housing structure of example 1.

[0027] Figure 10 is the schematic diagram of the rear drive motor and the rear axle connection of example 2.

[0028] Figure 11 is the schematic diagram of the positioning sleeve and the connecting bracket connection of example 2.

[0029] Figure 12 is the schematic diagram of the connecting bracket structure on the rear axle of example 2.

[0030] Figure 13 is the schematic diagram of the rear drive motor and the rear axle connection of example 3.

[0031] Figure 14 is the schematic diagram of the positioning sleeve and the support bracket connection through the axle pad of example 3.

[0032] Figure 15 is the schematic diagram of the support bracket structure on the rear axle of example 3.

[0033] Reference signs: frame-1, front drive axle-2, rear drive axle-3, axle housing-301, axle housing connection hole-3011, front transmission 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-1701, connecting vertical plate-1702, axle housing right support bracket-18. DETAILED DESCRIPTION

[0034] The utility model will be explained below in combination with the drawings and examples.

[0035] Example 1:

[0036] As shown in the attached figure, an electric power transmission system includes a drive motor and a drive axle, wherein the output shaft of the drive motor is directly connected to the input shaft of the drive axle; in this embodiment, the output shaft of the rear drive motor 6 is directly connected to the input shaft of the rear drive axle 3, but the output shaft of the front drive motor 5 can also be directly connected to the input shaft of the front drive axle 2 according to actual usage needs.

[0037] 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.

[0038] By directly driving the drive axle with the drive motor, the transmission system has a simple structure, fewer parts, high overall vehicle transmission efficiency, and high reliability. It can achieve continuously variable transmission, effectively avoiding the impact and jerking caused by gear shifting in a powertrain with a gearbox, improving vehicle stability, facilitating installation and maintenance, and reducing the size of the transmission system. It has a wide range of applications, suitable for both large and small vehicles. The positioning sleeve provides positioning and stable support, reducing vibration, wear, and abnormal noise, and enhancing overall rigidity. At the same time, the positioning sleeve also plays a role in sealing and dust prevention, 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.

[0039] As attached Figures 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.

[0040] 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.

[0041] As attached Figures 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.

[0042] The front end and the rear end of the positioning sleeve 7 are respectively provided with sleeve mounting holes 701, the housing of the rear drive motor 6 is provided with housing connecting holes, and the axle housing 301 of the rear drive axle 3 is provided with axle housing connecting holes 3011. The front end of the positioning sleeve 7 is connected with the housing of the rear drive motor 6 through the sleeve mounting holes 701 and the housing connecting holes through bolts, and the rear end of the positioning sleeve 7 is connected with the axle housing 301 of the rear drive axle 3 through the sleeve mounting holes 701 and the axle housing connecting holes 3011 through bolts. The structure is simple, and installation and maintenance are convenient.

[0043] In this embodiment, a plurality of sleeve mounting holes 701 are arranged on the front end face and the rear end face of the positioning sleeve 7, a plurality of housing connecting holes are arranged on the housing of the rear drive motor 6, and a plurality of axle housing connecting holes 3011 are arranged on the end face of the opening of the axle housing 301 of the rear drive axle 3. When connected, the front end face of the positioning sleeve 7 is attached to the housing of the rear drive motor 6, the sleeve mounting holes 701 are aligned with the housing connecting holes and are fixed through bolts, the rear end face of the positioning sleeve 7 is attached to the end face of the opening of the axle housing 301 of the rear drive axle 3, and the sleeve mounting holes 701 are aligned with the axle housing connecting holes 3011 and are fixed through bolts.

[0044] In this embodiment, the housing connecting holes and the axle housing connecting holes 3011 can be threaded holes, the front end of the positioning sleeve 7 is connected with the housing connecting holes through the sleeve mounting holes 701 through bolts, and the rear end of the positioning sleeve 7 is connected with the axle housing connecting holes 3011 through the sleeve mounting holes 701 through bolts. Alternatively, the sleeve mounting holes 701 can be threaded holes, the front end of the positioning sleeve 7 is connected with the sleeve mounting holes 701 through the housing connecting holes through bolts, and the rear end of the positioning sleeve 7 is connected with the sleeve mounting holes 701 through the axle housing connecting holes 3011 through bolts. Alternatively, the sleeve mounting holes 701, the housing connecting holes and the axle housing connecting holes 3011 can be light holes, the front end of the positioning sleeve 7 is connected with nuts through the sleeve mounting holes 701 and the housing connecting holes through bolts, and the rear end of the positioning sleeve 7 is connected with nuts through the sleeve mounting holes 701 and the axle housing connecting holes 3011 through bolts. The specific connection form is not limited to this, and can be set according to actual needs.

[0045] In this embodiment, the rear drive motor 6 is connected with the vehicle frame 1 through a flexible connecting piece. The elastic deformation of the flexible connecting piece absorbs and isolates vibration, avoids directly transmitting high-frequency vibration or impact load of the motor to the vehicle frame, supports the motor, and reduces bending moment.

[0046] The end of the rear drive motor 6 away from the output shaft is connected with the vehicle frame 1 through a pre-compressed flexible connecting piece. The support force of the pre-compressed flexible connecting piece offsets the bending moment of the drive axle caused by the weight and vibration of the motor.

[0047] The flexible connecting piece is fixed on the frame 1, a motor adjusting support 9 is connected on the flexible connecting piece, a long hole arranged in the vertical direction is formed on the motor adjusting support 9, a motor connecting support 8 is connected on the rear drive motor 6 shell, and the motor adjusting support 9 is connected with the motor connecting support 8 through bolts penetrating through the long hole.

[0048] The motor adjusting support 9 comprises a horizontal bottom plate and an adjusting vertical plate in this embodiment, the horizontal bottom plate and the adjusting vertical plate are in L shape, and the long hole is formed on the adjusting vertical plate.

[0049] The flexible connecting piece adopts a shock absorber 10 or an air spring or an elastic bushing, and is not limited to this, and other flexible connecting pieces can be arranged according to the need, so that the motor can be supported, pre-compressed and the vibration can be reduced.

[0050] The rear drive motor 6 can be connected with the frame 1 through the height-adjustable rigid support according to the need, the motor is supported, and the bending moment is reduced, one end of the rear drive motor 6 away from the output shaft is connected with the frame 1 through the height-adjustable rigid support, the bending moment of the drive axle caused by the weight and vibration of the motor is offset through the supporting force of the height-adjustable rigid support, the height-adjustable rigid support adopts a liquid cylinder or an air cylinder or an electric push rod or an adjustable flange support or a height-adjustable support rod, the extension amount of the height-adjustable rigid support is adjusted in advance, and the supporting force of the motor is adjusted, and the structure of the height-adjustable support rod is not limited to this, and other flexible connecting pieces can be arranged according to the need, so that the height can be adjusted and the motor can be supported.

[0051] The structure of the rear drive axle in this embodiment is prior art, and comprises an axle housing, a speed reducer, a differential, a half shaft and the like, and will not be described in detail here.

[0052] The rear drive motor is connected with the controller in this embodiment, and the controller can adopt a controller developed based on an MCU.

[0053] When the utility model is used:

[0054] The controller controls the rear drive motor 6 to start, the output shaft of the rear drive motor 6 rotates to drive the input shaft of the speed reducer of the rear drive axle 3 to rotate, and the rear wheel is driven to walk or turn; in this process, the positioning sleeve 7 is used to realize the positioning of the rear drive motor 6 and the rear drive axle 3 and stably support the two, and the flexible connecting piece or the height-adjustable rigid support is used to support the rear drive motor 6 and offset the bending moment of the drive axle caused by the weight and vibration of the motor.

[0055] Embodiment 2:

[0056] 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.

[0057] 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.

[0058] 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.

[0059] In this embodiment, the housing connecting hole and the support connecting hole can be threaded holes, the front end of the positioning sleeve 7 is connected with the housing connecting hole through a threaded connection after passing through the sleeve mounting hole 701 by a bolt, and the rear end of the positioning sleeve 7 is connected with the support connecting hole through a threaded connection after passing through the sleeve mounting hole 701 by a bolt; or the sleeve mounting hole 701 can be a threaded hole, the front end of the positioning sleeve 7 is connected with the sleeve mounting hole 701 through a threaded connection after passing through the housing connecting hole by a bolt, and the rear end of the positioning sleeve 7 is connected with the sleeve mounting hole 701 through a threaded connection after passing through the support connecting hole by a bolt; or the inner holes of the sleeve mounting hole, the housing connecting hole and the support connecting hole can be smooth structures, the front end of the positioning sleeve 7 is connected with a nut through a threaded connection after passing through the sleeve mounting hole and the housing connecting hole by a bolt, and the rear end of the positioning sleeve 7 is connected with a nut through a threaded connection after passing through the sleeve mounting hole and the housing connecting hole by a bolt; the specific connection form is not limited to this, and can be set according to actual needs.

[0060] Embodiment 2 is different from Embodiment 1 only in the connection structure of the positioning sleeve, and other same parts are not described in detail herein.

[0061] Embodiment 3:

[0062] Embodiment 3 is different from Embodiment 1 in that, as shown in FIG. 3, the rear drive motor 6 is connected with the rear drive axle 3 through a fastener, the rear end of the positioning sleeve 7 is fitted with the opening of the rear drive axle 3, the left connecting plate 13 fixed to the rear end of the positioning sleeve 7 is connected with the left support bracket 17 of the rear drive axle 3, and the right connecting plate 14 fixed to the rear end of the positioning sleeve 7 is connected with the right support bracket 18 of the rear drive axle 3. Figures 13-15

[0063] In this embodiment, the front end face of the positioning sleeve 7 is provided with a plurality of sleeve mounting holes 701 spaced apart in the circumferential direction, the housing of the rear drive motor 6 is provided with a plurality of housing connecting holes spaced apart in the circumferential direction, 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 bracket 17 and the right support bracket 18 of the rear drive axle 3 are provided with support connecting holes, respectively. When connected, the front end face of the positioning sleeve 7 is fitted with the housing of the rear drive motor 6, the sleeve mounting holes are aligned with the housing connecting holes and are fixed by bolts, the rear end face of the positioning sleeve 7 is fitted with the opening of the rear drive axle 3, the sleeve mounting holes are aligned with the support connecting holes, the left connecting plate 13 at the rear end of the positioning sleeve 7 is connected with the left support bracket 17 of the rear drive axle 3 through the sleeve mounting hole and the support connecting hole by a bolt, and the right connecting plate 14 at the rear end of the positioning sleeve 7 is connected with the right support bracket 18 of the rear drive axle 3 through the sleeve mounting hole and the support connecting hole by a bolt.​

[0064] The left axle housing support frame 17 and the right axle housing support frame 18 respectively comprise an axle pad plate 1701 and a vertical plate 1702, the lower end of the vertical plate 1702 is connected with the axle pad plate 1701, the end of the left connecting plate 13 away from the positioning sleeve 7 is connected with the vertical plate of the left axle housing support frame 17, and the end of the right connecting plate 14 away from the positioning sleeve 7 is connected with the vertical plate of the right axle housing support frame 18.

[0065] The left connecting plate 13 and the right connecting plate 14 are arranged as arc-shaped plates facing the rear drive axle 3, and the left connecting plate 13 and the right connecting plate 14 are arranged as arc-shaped plates, which are convenient for being connected with the left axle housing support frame 17 and the right axle housing support frame 18.

[0066] In this embodiment, the frame 1 is located above the rear drive axle 3 at the position of the rear drive axle 3, the axle pad plate 1701 is located below the rear drive axle 3, and the axle pad plate 1701 is threadedly connected with the frame 1 through a plurality of bolts and nuts, so that the rear drive axle 3 is limited between the axle pad plate 1701 and the bottom surface of the frame 1, and the left axle housing support frame 17 and the right axle housing support frame 18 are arranged, which not only limits the rear drive axle 3, but also connects with the positioning sleeve 7.

[0067] In this embodiment, bolts are inserted into four corners of the axle pad plate 1701, so as to limit the front and rear and upper and lower positions of the rear drive axle.

[0068] In this embodiment, the housing connecting hole and the support connecting hole can be arranged as threaded holes, the front end of the positioning sleeve 7 is threadedly connected with the housing connecting hole through the sleeve mounting hole 701 after passing through the sleeve mounting hole 701 by a bolt, and the rear end of the positioning sleeve 7 is threadedly connected with the support connecting hole through the sleeve mounting hole 701 after passing through the support connecting hole by a bolt; or the sleeve mounting hole 701 can be arranged as a threaded hole, the front end of the positioning sleeve 7 is threadedly connected with the sleeve mounting hole after passing through the housing connecting hole by a bolt, and the rear end of the positioning sleeve 7 is threadedly connected with the sleeve mounting hole after passing through the support connecting hole by a bolt; or the inner holes of the sleeve mounting hole, the housing connecting hole and the support connecting hole can be arranged as smooth structures, the front end of the positioning sleeve 7 is threadedly connected with the nut after passing through the sleeve mounting hole and the housing connecting hole by a bolt, and the rear end of the positioning sleeve 7 is threadedly connected with the nut after passing through the sleeve mounting hole and the support connecting hole by a bolt; the specific connection form is not limited to this, and can be arranged according to actual needs.

[0069] In this embodiment, the left connecting plate 13 and the right connecting plate 14 can be welded with the positioning sleeve 7 or integrally formed.

[0070] The difference between the embodiment 3 and the embodiment 1 is only the connection structure of the positioning sleeve, and other same parts are not described in detail.

[0071] As shown in FIG. 1, the frame 1 is arranged on the vehicle, the rear drive axle 3 is arranged on the frame 1, the left connecting plate 13 and the right connecting plate 14 are arranged on the frame 1, the left connecting plate 13 and the right connecting plate 14 are connected with the left axle housing support frame 17 and the right axle housing support frame 18 respectively, the left axle housing support frame 17 and the right axle housing support frame 18 are connected with the positioning sleeve 7, and the positioning sleeve 7 is connected with the housing 2. Figures 1-2As shown, the application discloses a double-motor electric traction vehicle, which comprises a vehicle frame 1, a front drive axle 2, a rear drive axle 3, a front drive motor 5 and a rear drive motor 6. The front drive motor 5 drives the front drive axle 2 through a front transmission shaft 4. One end of the front transmission shaft 4 is connected with an output shaft of the front drive motor 5, and the other end is connected with an input shaft of a reducer of the front drive axle 2. Power transmission is realized through the transmission shaft. An output shaft of the rear drive motor 6 is directly connected with an input shaft of a reducer of the rear drive axle 3 to drive the rear drive axle 3. The front drive motor 5 and the rear drive motor 6 are fixed with the vehicle frame 1. The front drive motor 5 and the rear drive motor 6 are respectively connected with a controller. The vehicle axle is driven by two groups of motors, the transmission efficiency of the whole vehicle is improved, the transmission noise is reduced, energy saving and environmental protection are realized, and the front and rear wheels are synchronously controlled by the controller.

[0072] The front drive motor 5 and the rear drive motor 6 are powered by a power battery pack.

[0073] The front drive motor 5 is connected with the vehicle frame 1 through a shock absorber to reduce and isolate vibration. The front drive axle 2 is connected with the vehicle frame 1 through a suspension, and the rear drive axle 3 is connected with the vehicle frame 1 through a bridge pad 1701 to limit the rigidity.

[0074] The output shaft of the front drive motor 5 can be directly connected with the input shaft of the reducer of the front drive axle 2, and the output shaft of the rear drive motor 6 can be directly connected with the input shaft of the reducer of the rear drive axle 3. Alternatively, the output shaft of the front drive motor 5 can be directly connected with the input shaft of the reducer of the front drive axle 2, and the output shaft of the rear drive motor 6 can be connected with the input shaft of the reducer of the rear drive axle 3 through a rear transmission shaft. The specific driving mode can be set according to actual requirements.

Claims

1. An electrically powered power transmission system characterised in that: The drive motor and the drive axle are connected directly by the output shaft of the drive motor and the input shaft of the drive axle; The output shaft of the drive motor and the input shaft of the drive axle 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 axle housing.

2. An electrically powered power transmission system according to claim 1, characterised in that: The output shaft of the drive motor is connected with the motor end flange, the input shaft of the drive axle reducer passes through the opening of the drive axle housing and is connected with the axle end flange, the motor end flange is connected with the axle end flange through fasteners.

3. An electrically powered power transmission system according to claim 1 or 2, characterised in that: The front end of the positioning sleeve and the rear end of the positioning sleeve are connected with the drive motor and the drive axle housing through fasteners.

4. An electrically powered power transmission system as claimed in claim 3, characterised in that: 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 axle housing is provided with a housing connecting hole.

5. An electrically powered power transmission system as claimed in claim 1 or 2, characterised in that: 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 axle housing through bolts passing through the sleeve mounting hole and the housing connecting hole.

6. An electrically powered power transmission system as claimed in claim 5, characterised in that: The left end of the drive axle housing is fixedly connected with a left connecting bracket, and the right end is fixedly connected with a right connecting bracket.

7. An electrically powered power transmission system as claimed in claim 1 or 2, characterised in that: The front end of the positioning sleeve is connected with the drive motor housing through fasteners, and the rear end surface of the positioning sleeve is in abutment with the end surface of the drive axle housing.

8. An electrically powered power transmission system as claimed in claim 1 or 2 or 4 or 6, characterised in that: The left side of the rear end of the positioning sleeve and the right side of the rear end of the positioning sleeve are respectively provided with sleeve mounting holes, and the left connecting bracket and the right connecting bracket are respectively provided with bracket connecting holes.

9. An electrically powered power transmission system as claimed in claim 8, characterised in that: The left end of the drive axle housing is provided with a left support frame, and the right end is provided with a right support frame.

10. An electrically powered power transmission system as claimed in claim 1 or 2 or 4 or 6, characterised in that: The drive motor is connected with the vehicle frame through a flexible connecting piece. The flexible connecting piece is fixed on the vehicle frame, and a motor adjusting bracket is connected to the flexible connecting piece. The drive motor is connected with the vehicle frame through a height-adjustable rigid support.

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