Electric vehicle

Abstract

The invention relates to the technical field of electric vehicles, in particular to an electric vehicle which comprises a motor, a battery assembly, a frame, a rear bottom fork, a rear bottom fork shaft, a motor power output chain wheel and a rear wheel power input chain wheel, a rear wheel is arranged on the rear section of the rear bottom fork, and the rear wheel power input chain wheel is connected to a hub of the rear wheel. Power is transmitted between the motor power output chain wheel and the rear wheel power input chain wheel through a chain or a belt, the motor comprises an inner stator and an outer rotor, an axial inner stator through hole is formed in the center of the inner stator, the motor power output chain wheel is axially fixed to the side face of the outer rotor, and the rear bottom fork shaft is assembled in the inner stator through hole in a matched mode. The central axis of the power output chain wheel of the motor, the central axis of the inner stator and the central axis of the rear fork shaft are located on the same straight line, and by the adoption of the technical scheme, it is guaranteed that a preset distance is kept no matter how the rear fork rotates, and therefore it is guaranteed that the tension degree of a transmission chain or a transmission belt is kept consistent.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles. Background Art

[0002] The existing electric vehicle with a mid-mounted motor comprises a frame, an electric motor, a battery, a rear fork, a rear wheel, an electric motor power output sprocket and a rear wheel power input sprocket, wherein the rear wheel is arranged at the rear section of the rear fork, and the rear wheel power input sprocket is connected to the wheel hub of the rear wheel. The electric motor mainly adopts a mid-mounted motor, and the mid-mounted motor adopts a structural form of an outer stator and an inner rotor, wherein the inner rotor is the motor shaft, and the electric motor power output sprocket on the motor shaft directly drives the rear wheel power input sprocket on the rear wheel hub wheel supported and fixed by the rear section of the rear fork through a transmission chain or belt. A rear fork shaft is arranged between the motor power output sprocket and the rear wheel power input sprocket, and the rear fork is rotatably connected to the middle section of the frame through the rear fork shaft. This structure is simple and practical, and is also the existing electric vehicle mid-mounted motor power arrangement structure. However, since the motor shaft and the rear fork shaft are not in a straight line, when the rear fork swings, the distance between the rear wheel power input sprocket and the motor power output sprocket will change, thereby causing the tension of the transmission chain or belt to change, and the transmission chain or belt will interfere with the rear fork, and even break the chain or belt or cause the chain or belt to loosen and fall off. This situation often occurs when the rear fork swings a large amplitude, especially when the off-road vehicle is doing extreme sports. Summary of the invention

[0003] In view of the defects of the prior art, the present invention proposes an electric vehicle, which can not only solve the defect of the prior art that the motor shaft and the rear fork shaft are not coaxial, thereby ensuring that the tension of the transmission chain or belt remains stable no matter how the rear fork rotates, but also connect the frame, rear fork and motor together through the rear fork shaft, thereby reducing the difficulty of assembly and improving the strength.

[0004] To achieve the above-mentioned purpose, the present patent application discloses an electric vehicle, comprising an electric motor, a battery assembly, a frame, a rear fork, a rear fork shaft, a rear shock absorber, a rear wheel, a motor power output sprocket and a rear wheel power input sprocket, wherein the rear wheel is arranged at the rear section of the rear fork, the rear wheel power input sprocket is connected to the hub of the rear wheel, power is transmitted between the motor power output sprocket and the rear wheel power input sprocket via a chain or belt, the motor comprises an inner stator and an outer rotor, an axial inner stator through hole is provided at the center of the inner stator, the motor power output sprocket is axially fixed to the side of the outer rotor, and the rear fork shaft is fitted in the inner stator through hole; the central axis of the motor power output sprocket, the central axis of the inner stator and the central axis of the rear fork shaft are on the same straight line.

[0005] With the above technical solution, since the motor adopts an inner stator and outer rotor, and an axial inner stator through hole is provided in the center of the inner stator, which is different from the outer stator and inner rotor structure of the general mid-mounted motor. The rear fork shaft of this patent passes through the front section of the rear fork and the inner stator through hole to support the motor and the front section of the rear fork on the frame, firstly, it is ensured that the distance between the rear fork shaft and the rear wheel power input sprocket is maintained at a preset distance regardless of how the rear fork rotates, thereby ensuring that the tension of the transmission chain or belt remains consistent, and secondly, compared with the virtual coaxial, it reduces the difficulty of assembly and improves the strength.

[0006] It is further defined that the motor power output sprocket is provided with a motor power output sprocket connecting hole; the outer rotor side is provided with an outer rotor threaded hole matching the motor power output sprocket connecting hole; and the motor power output sprocket is fixed to the outer rotor side by bolts.

[0007] By adopting the above technical solution, the power output sprocket of the motor can be conveniently fixedly connected to the outer rotor, and the axial play of the power output sprocket of the motor can also be reduced.

[0008] It is further defined that the frame includes a left main frame and a right main frame extending up and down, the middle section of the left main frame is provided with a left frame center axis hole, and the middle section of the right main frame is provided with a right frame center axis hole; the rear fork includes a left rear fork and a right rear fork extending front and back, the front end of the left rear fork is provided with a left rear fork axis hole, and the front end of the right rear fork is provided with a right rear fork axis hole; the rear fork axis passes through the left frame center axis hole, the left rear fork axis hole, the inner stator through hole, the right rear fork axis hole and the right frame center axis hole in sequence.

[0009] In addition, in order to better reduce the connection distance between the battery assembly and the electric motor and ensure the stability of the connection at the shortest distance, the rear end of the battery assembly is connected to the front end of the electric motor, and the upper end of the battery assembly is connected to the frame. Such a power layout is also beneficial to the stability of the center of gravity of the entire vehicle.

[0010] In order to ensure the stability of the frame, the technical solution also includes a lower connecting rod, the lower end of the left main frame is provided with a left frame lower axle hole, and the lower end of the right main frame is provided with a right frame lower axle hole; the left main frame is connected to the left end of the lower connecting rod by bolts passing through the left frame lower axle hole; the right main frame is connected to the right end of the lower connecting rod by bolts passing through the right frame lower axle hole.

[0011] By the same token, the technical solution also includes a left sub-frame and a right sub-frame, wherein the left sub-frame is connected to the upper end of the left main frame, and the right sub-frame is connected to the upper end of the right main frame; the left sub-frame and the right sub-frame are both triangular brackets, and at least two corner points of the triangular bracket are fixedly connected to the frame.

[0012] In order to better ensure the stability of the left rear flat fork and the right rear flat fork and to better connect the rear shock absorber to the rear flat fork, it is further defined that a rear shock absorber lower support rod is included, and the rear shock absorber lower support rod connects the left rear flat fork and the front section of the right rear flat fork; a rear shock absorber lower support seat is provided in the middle of the upper end of the rear shock absorber lower support rod, and the lower end of the rear shock absorber is hingedly connected to the rear shock absorber lower support seat.

[0013] In addition, the technical solution is limited to include a left main frame bearing and a right main frame bearing, the left main frame bearing is arranged in the left frame middle axis hole, and the right main frame bearing is arranged in the right frame middle axis hole. In order to facilitate the movement between the rear fork shaft and the rear fork, a bushing is usually set at the corresponding position of the frame, so that after long-term use and stress, it is easy to wear and form a gap, causing the rear fork to shake. The left main frame bearing and the right main frame bearing of the technical solution can better ensure the stability of the movement between the rear fork shaft and the rear fork, and ensure the axial runout of the rear fork, which is particularly suitable for the case where the rear fork of high-impact models such as off-road models reciprocates and rotates relatively large. In this state, the rear fork shaft passes through the left main frame bearing, the left rear fork shaft hole, the inner stator through hole, the right rear fork shaft hole and the right main frame bearing in sequence, and the rear fork rotates more flexibly, and can more effectively prevent the overall radial runout of the rear fork, thereby ensuring the stability of the vehicle performance.

[0014] Compared with the prior art, the present invention has the following advantages: Since the central axis of the motor power output sprocket, the central axis of the inner stator and the central axis of the rear fork shaft are in the same straight line, no matter how the rear fork swings, the distance between the rear fork shaft and the rear wheel power input sprocket on the rear wheel hub will not change, that is, the tension of the chain or belt will not change, and the transmission chain or belt will not interfere with the rear fork, thereby extending the service life of the transmission chain and belt. At the same time, there is no need to reduce the tension in advance to adapt to the change in tension, causing additional noise and transmission vibration.

[0015] The invention has a simple structure, low component cost and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structural assembly of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Example

[0018] like Figure 1 As shown, an electric vehicle, an electric vehicle, comprises an electric motor 1, a battery assembly 2, a frame, a rear fork, a rear fork shaft 5, a rear shock absorber 6, a rear wheel, a motor power output sprocket 7 and a rear wheel power input sprocket 8, the frame comprises a left main frame 31 and a right main frame 32 extending up and down, the middle section of the left main frame 31 is provided with a left frame middle shaft hole 310, and the middle section of the right main frame 32 is provided with a right frame middle shaft hole 320; the rear fork comprises a left rear fork 41 and a right rear fork 42 extending forward and backward, the front end of the left rear fork 41 is provided with a left rear fork shaft hole 411, and the front end of the right rear fork 42 is provided with a right rear fork shaft hole 421; the rear wheel (not shown in the figure) The rear fork shaft 5 is provided at the rear section of the rear fork, the rear wheel power input sprocket 8 is connected to the wheel hub of the rear wheel, the power is transmitted between the motor power output sprocket 7 and the rear wheel power input sprocket 8 through a chain or a belt, the motor 1 comprises an inner stator 11 and an outer rotor 12, the center of the inner stator 11 is provided with an axial inner stator through hole 111, the motor power output sprocket 7 is axially fixed on the side of the outer rotor 12, and the rear fork shaft 5 is fitted in the inner stator through hole 111; the central axis of the motor power output sprocket 7, the central axis of the inner stator 11 and the central axis of the rear fork shaft are on the same straight line. The rear fork shaft 5 passes through the left frame center axis hole 310, the left rear fork shaft hole 411, the inner stator through hole 121, the right rear fork shaft hole 421 and the right frame center axis hole 320 in sequence; With the above technical solution, since the motor adopts an inner stator and outer rotor, and an axial inner stator through hole is provided in the center of the inner stator, which is different from the outer stator and inner rotor structure of the general mid-mounted motor. The rear fork shaft of this patent passes through the front section of the rear fork and the inner stator through hole to support the motor and the front section of the rear fork on the frame, firstly, it is ensured that the distance between the rear fork shaft and the rear wheel power input sprocket is maintained at a preset distance regardless of how the rear fork rotates, thereby ensuring that the tension of the transmission chain or belt remains consistent, and secondly, compared with the virtual coaxial, it reduces the difficulty of assembly and improves the strength.

[0019] In addition, since the mid-mounted electric motor used has an outer rotor and inner stator structure, the inner stator of the electric motor needs supporting force so that there is a mechanism to provide reaction force when power output is needed. In this way, the reaction force of the electric motor will press the front end of the rear fork downward while we are outputting power, which will increase the explosive power of the entire vehicle when starting, just like when we push our legs downward when running.

[0020] In addition, since the inner rotor diameter of the mid-mounted electric motor in the prior art is relatively small, all mid-mounted inner rotor electric motors will be equipped with a reduction gearbox to increase the output torque, so that they can start and climb better. The outer rotor using this technical solution has a larger force rotation radius, so the rear wheel can be directly driven by the motor power output sprocket, which will be better in terms of spatial layout and energy consumption level of the transmission system.

[0021] Further optimization, the motor power output sprocket 7 is provided with a motor power output sprocket connecting hole 71; the side of the outer rotor 12 is provided with an outer rotor threaded hole 121 matching the motor power output sprocket connecting hole 71; the motor power output sprocket 7 is fixed to the side of the outer rotor 12 by bolts 9.

[0022] By adopting the above technical solution, the motor power output sprocket 7 can be conveniently fixedly connected to the outer rotor 12, and the axial stringing of the motor power output sprocket can be reduced, thereby ensuring the axial runout of the chain or belt and more stably protecting the stability of the transmitted power.

[0023] In addition, in order to better reduce the connection distance between the battery assembly and the electric motor and ensure the stability of the electrical connection at the shortest distance, the rear end of the battery assembly 2 is connected to the front end of the electric motor 1, and the upper end of the battery assembly 2 is connected to the frame. Such a power arrangement is also beneficial to the stability of the center of gravity of the entire vehicle.

[0024] In order to ensure the stability of the frame, the technical solution also includes a lower connecting rod 30, the lower end of the left main frame is provided with a left frame lower shaft hole 313, and the lower end of the right main frame is provided with a right frame lower shaft hole 323; the left main frame is connected to the left end of the lower connecting rod 30 by passing the bolt 9 through the left frame lower shaft hole 313; the right main frame is connected to the right end of the lower connecting rod 30 by passing the bolt 9 through the right frame lower shaft hole 323. In addition, the front footrest 92 can also be arranged outside the left frame lower shaft hole 313 and the right frame lower shaft hole 323, and the bolt 9 is passed through the right front footrest 92 and the right frame in sequence to connect to the right end of the lower connecting rod 30, and similarly, the bolt 9 is passed through the left front footrest 92 and the left frame in sequence to connect to the left end of the lower connecting rod 30.

[0025] By the same token, the present technical solution also includes a left sub-frame 310 and a right sub-frame 320, wherein the left sub-frame 310 is connected to the upper end of the left main frame 31, and the right sub-frame 320 is connected to the upper end of the right main frame 32; the left sub-frame 310 and the right sub-frame 320 are both triangular brackets, and at least two corner points of the triangular bracket are fixedly connected to the frame.

[0026] In order to better ensure the stability of the left rear flat fork 41 and the right rear flat fork 42, and to better connect the rear shock absorber to the rear flat fork, it is further defined that a rear shock absorber lower support rod 40 is included, and the rear shock absorber lower support rod 40 connects the left rear flat fork 41 and the front section of the right rear flat fork 42; a rear shock absorber lower support seat 401 is provided in the middle of the upper end of the rear shock absorber lower support rod 40, and the lower end of the rear shock absorber 6 is hingedly connected to the rear shock absorber lower support seat 401.

[0027] The positions of the left main frame bearing and the right main frame bearing in the present technical solution are set inside the main frames on both sides, so the rear fork shaft locks the inner holes of the bearings inside the frames on both sides, the rear fork body, and the internal fixed stator of the outer rotor motor together, so that the stator inside the motor and the rear fork body are locked together and rotated by the bearing limit of the frames on both sides.

[0028] Compared with the prior art, the present invention has the following advantages: Since the central axis of the motor power output sprocket, the central axis of the inner stator and the central axis of the rear fork shaft are in the same straight line, no matter how the rear fork swings, the distance between the rear fork shaft and the rear wheel power input sprocket on the rear wheel hub will not change, that is, the tension of the chain or belt will not change, and the transmission chain or belt will not interfere with the rear fork, thereby extending the service life of the transmission chain and belt. At the same time, there is no need to reduce the tension in advance to adapt to the change in tension, causing additional noise and transmission vibration.

[0029] The motor used in this patent is different from the commonly used electric motors. The motor used in this patent is an outer rotor and inner stator motor. The working principle of this motor mechanism is the same as that of the hub motor. The stator shaft is fixed, while the outer rotor rotates like a rear wheel.

[0030] In addition, this structure that directly uses the rear flat fork shaft as the stator center axis (center iron core) is also beneficial to increasing the magnetic flux. The use of this motor mechanism can output power more efficiently.

[0031] In addition, the technical solution also includes a left main frame bearing 311 and a right main frame bearing 321. The left main frame bearing 311 is arranged in the left frame center shaft hole 310, and the right main frame bearing 321 is arranged in the right frame center shaft hole 320. In order to facilitate the movement between the rear fork shaft 5 and the rear fork, the existing electric vehicles usually only set a bushing at the corresponding position of the frame. In this way, after long-term use and stress, it is easy to wear and form a gap, causing the rear fork to shake. The left main frame bearing 311 and the right main frame bearing 321 of the present technical solution can better ensure the stability of the movement between the rear fork shaft 5 and the rear fork, and ensure the axial runout of the rear fork. It is particularly suitable for the situation where the rear fork reciprocates greatly during high-impact sports such as off-road vehicles. In this state, the rear fork shaft 5 passes through the left main frame bearing 311, the left rear fork shaft hole 411, the inner stator through hole 111, the right rear fork shaft hole 421 and the right main frame bearing 321 in sequence, and the rear fork rotates more flexibly, and can more effectively prevent the radial runout of the entire rear fork, thereby ensuring the stability of the performance of the whole vehicle.

[0032] The invention has a simple structure, low component cost and wide applicability.

[0033] The description of the specific embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that the above is only a preferred specific implementation method of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principle of the present invention. These improvements and modifications will also fall within the scope of protection of the claims of the present invention.

Claims

1. An electric vehicle, comprising a motor, a battery assembly, a frame, a rear fork, a rear fork shaft, a rear shock absorber, a rear wheel, a motor power output sprocket and a rear wheel power input sprocket, wherein the rear wheel is arranged at the rear section of the rear fork, the rear wheel power input sprocket is connected to the wheel hub of the rear wheel, and power is transmitted between the motor power output sprocket and the rear wheel power input sprocket through a chain or a belt, characterized in that: The electric motor comprises an inner stator and an outer rotor, an axial inner stator through hole is provided at the center of the inner stator, the power output sprocket of the electric motor is axially fixed to the side of the outer rotor, and the rear fork shaft is fitted in the inner stator through hole; the central axis of the power output sprocket of the electric motor, the central axis of the inner stator and the central axis of the rear fork shaft are on the same straight line.

2. An electric vehicle according to claim 1, characterized in that: The motor power output sprocket is provided with a motor power output sprocket connecting hole; the outer rotor side is provided with an outer rotor threaded hole matching the motor power output sprocket connecting hole; the motor power output sprocket is fixed to the outer rotor side by bolts.

3. An electric vehicle according to claim 1, characterized in that: The frame includes a left main frame and a right main frame extending up and down, the middle section of the left main frame is provided with a left frame center axis hole, and the middle section of the right main frame is provided with a right frame center axis hole; the rear fork includes a left rear fork and a right rear fork extending front and back, the front end of the left rear fork is provided with a left rear fork axis hole, and the front end of the right rear fork is provided with a right rear fork axis hole; the rear fork axis passes through the left frame center axis hole, the left rear fork axis hole, the inner stator through hole, the right rear fork axis hole and the right frame center axis hole in sequence.

4. An electric vehicle according to claim 1, characterized in that: The rear end of the battery assembly is connected to the front end of the motor, and the upper end of the battery assembly is connected to the vehicle frame.

5. An electric vehicle according to claim 3, characterized in that: It also includes a lower connecting rod, the lower end of the left main frame is provided with a left frame lower axle hole, and the lower end of the right main frame is provided with a right frame lower axle hole; the left main frame is connected to the left end of the lower connecting rod by bolts passing through the left frame lower axle hole; the right main frame is connected to the right end of the lower connecting rod by bolts passing through the right frame lower axle hole.

6. An electric vehicle according to claim 3, characterized in that: It also includes a left sub-frame and a right sub-frame, wherein the left sub-frame is connected to the upper end of the left main frame, and the right sub-frame is connected to the upper end of the right main frame.

7. An electric vehicle according to claim 6, characterized in that: The left auxiliary frame and the right auxiliary frame are both triangular brackets, and at least two corner points of the triangular brackets are fixedly connected to the frame.

8. An electric vehicle according to claim 3, characterized in that: It also includes a rear shock absorber lower support rod, which connects the left rear flat fork and the front section of the right rear flat fork; a rear shock absorber lower support seat is provided in the middle of the upper end of the rear shock absorber lower support rod, and the lower end of the rear shock absorber is hingedly connected to the rear shock absorber lower support seat.

9. An electric vehicle according to claim 3, characterized in that: It also includes a left main frame bearing and a right main frame bearing. The left main frame bearing is arranged in the middle shaft hole of the left frame, and the right main frame bearing is arranged in the middle shaft hole of the right frame.

Images