Primary reduction gearbox of electric motorcycle

Abstract

The utility model relates to the technical field of electric motorcycles, in particular to a primary reduction gearbox of an electric motorcycle, which comprises a motor, a box body, a driving gear, a driven output shaft, a driven gear, an output chain wheel and a transmission belt. The driven gear is fixedly connected to the driven output shaft, the driving gear and the driven gear are connected through the transmission belt, one end of the driven output shaft extends out of the box body, and the output chain wheel is fixedly connected to the end, located outside the box body, of the driven output shaft. The motor is located at the lower rear end of the box body, and the driven output shaft is located at the upper front end of the box body, so that the motor with the largest relative mass volume is located at the lower rear end of the whole power device, the gravity center of the electric motorcycle is relatively lowered and located in the center of a motorcycle body, and stability of the whole motorcycle is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric motorcycle technical field, concretely relates to electric motorcycle primary reduction gearbox. BACKGROUND

[0002] The motorcycle is not only a tool for walking, but also a light transport tool, which brings great convenience to people's life. The traditional motorcycle adopts a fuel engine, and a speed change mechanism is arranged in the speed change box, the speed change mechanism comprises a crank piston, a transmission main shaft and an output secondary shaft, the secondary shaft is arranged at the rear end of the box body, the front end of the speed change box body is a cylinder body and a cylinder head, wherein the volume of the speed change mechanism is large, the mass is heavy, the position is low and located in the middle of the vehicle body, which can reduce the overall gravity center of the whole fuel power vehicle and the gravity center is concentrated in the middle of the vehicle body, at the same time, the cylinder head part as the highest heat combustion chamber is arranged at the most front end, which is beneficial to air cooling and the position is higher than that of the speed change mechanism. At present, most of the electric motorcycles are modified from the traditional fuel motorcycles, the original fuel engine is replaced by an electric motor by borrowing the frame and body structure of the original fuel motorcycle, the power is directly output by the electric motor through the power supply of the storage battery and the control of the controller, the speed is high, but the output torque is small, which is not suitable for climbing the mountain road, in order to enhance the torque, it is usually necessary to increase the reduction gearbox, at present, the reduction gearbox of the electric motorcycle usually borrows the speed change box of the fuel motorcycle, only the cylinder head and the cylinder body part of the fuel engine are removed, and the electric motor is arranged at the position of the cylinder body and the cylinder body, that is, the electric motor is located at the front end and the upper end of the output shaft, since the electric motor is relatively heavier compared with the whole power box body, especially the mass of the high-power primary speed change electric motor is relatively heavier, which causes the gravity center of the electric motorcycle to be relatively high, the gravity center is too front, which is not conducive to the stability of the whole vehicle, in addition, the electric motor will not produce a large amount of heat like the combustion chamber part of the fuel engine, and it does not need to consider too much in heat dissipation. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a kind of electric motorcycle primary reduction gearbox, solve the technical problem that the gravity center of electric motorcycle is relatively high, the gravity center is too front.

[0004] The above technical purpose of the utility model is realized by the following technical scheme:

[0005] The application discloses a primary reduction gearbox of an electric motorcycle, which comprises an electric motor, a gearbox, a driving gear, a driven output shaft, a driven gear, an output sprocket and a transmission belt, wherein the electric motor, the driving gear and the driven gear are arranged in the gearbox, the driving gear is fixedly connected to a shaft of the electric motor, the driven gear is fixedly connected to the driven output shaft, the transmission belt is connected to the driving gear and the driven gear, one end of the driven output shaft extends out of the gearbox, and the output sprocket is fixedly connected to the end of the driven output shaft outside the gearbox.

[0006] The primary reduction gearbox of the electric motorcycle has only one-stage transmission, and thus, compared with a fuel motorcycle, the rotation direction of the output sprocket can be reasonably output by changing the rotation direction of the electric motor, and the one-stage transmission can be used to solve the problem, so that the structure is simple and compact, and the overall volume is small; in addition, the electric motor is arranged at the lower rear end of the gearbox, and the driven output shaft is arranged at the front end of the gearbox and is higher than the shaft of the electric motor, so that the electric motor with the largest mass and volume is arranged at the lower rear end of the whole power device, the gravity center of the electric motorcycle is relatively lowered, and is arranged at the center of the vehicle body, and the stability of the whole vehicle is improved.

[0007] Further, the primary reduction gearbox of the electric motorcycle further comprises a tensioning wheel, the tensioning wheel is arranged in the gearbox, the tensioning wheel is arranged above the transmission belt, and the position adjusting structure of the tensioning wheel is arranged outside the gearbox; the tensioning wheel can better ensure the tensioning state of the transmission belt and the stability of transmission.

[0008] Further, the lower end of the tensioning wheel abuts against the inner side of the transmission belt, and the tensioning wheel is in tooth-shaped engagement with the transmission belt; the tensioning wheel is arranged at the inner side of the transmission belt, the overall structure is compact, and the tooth-shaped engagement between the tensioning wheel and the transmission belt can better ensure the stability of transmission.

[0009] Similarly, in order to ensure the stability of transmission between the driving gear and the transmission belt and the stability of transmission between the driven gear and the transmission belt, the transmission belt is in tooth-shaped engagement with the driving gear, the driven gear and the transmission belt.

[0010] In addition, the transmission belt is a belt or a chain, and the transmission belt is provided with tooth shapes which are in engagement with the driving gear and the driven gear.

[0011] In order to ensure the gap compensation of the transmission belt in the axial jump during the transmission process, gear pads are arranged in the driving gear and the driven gear. The gear pads can be used to adjust the side clearance of the gear to ensure the normal operation of the gear, and when the gear is fixed, the gear pads can provide additional locking force to prevent the gear from loosening due to vibration.

[0012] By adopting the technical scheme, the motor and the speed change mechanism are integrated to form a simple first-stage reduction box of the electric motorcycle, the motor with the largest mass and volume is arranged at the lower rear end of the entire power device, the center of gravity of the electric motorcycle is relatively lowered and located at the center of the vehicle body, and the stability of the overall vehicle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any novelty labor.

[0014] Figure 1 is a simple schematic diagram of the internal structure of the first-stage reduction box of the electric motorcycle. DETAILED DESCRIPTION

[0015] The present application will be further described in detail below with reference to the drawings.

[0016] As shown in Figure 1 A first-stage reduction box of an electric motorcycle, the electric motorcycle comprising a motor 1, a box body 2, a driving gear 11, a driven output shaft, a driven gear 31, an output sprocket (not shown in the figure, which can be arranged on the left side of the box body or on the right side of the box body) and a transmission belt 4, the motor 1, the driving gear 11 and the driven gear 31 are arranged in the box body 2, the driving gear 11 is fixedly connected to the shaft of the motor 1, the driven gear 31 is fixedly connected to the driven output shaft, the transmission belt 4 connects the driving gear 11 and the driven gear 31 to transmit the power of the motor 1 to the driven output shaft and then to the output sprocket, one end of the driven output shaft extends out of the box body 2, and the output sprocket is fixedly connected to the end of the driven output shaft outside the box body 2; the motor 1 is located at the lower rear end of the box body 2, and the driven output shaft is located at the upper front end of the box body 2.

[0017] The electric motorcycle one-stage reduction gearbox adopts the technical scheme, and only one-stage transmission is needed, so it is not necessary to consider the rotation direction of the crank of a fuel motorcycle, and at least one transmission main shaft and an output secondary shaft are needed to reasonably output the rotation direction of the output sprocket, and only the rotation direction of the electric motor needs to be changed to solve the output rotation direction problem by one-stage transmission, so the structure is simple and compact, and the overall volume is small; in addition, the electric motor is located at the lower rear end of the box body, and the driven output shaft is located at the front end of the box body, and the position of the driven output shaft is higher than the position of the motor shaft of the electric motor, so the electric motor with the largest mass and volume is located at the lower rear end of the entire power device, the center of gravity of the electric motorcycle is relatively lowered, and is located at the center of the vehicle body, which is beneficial to the stability of the overall vehicle.

[0018] In addition, as a further optimization of the above technical scheme, the electric motorcycle one-stage reduction gearbox further comprises a tensioning wheel 6, the tensioning wheel 6 is arranged in the box body 2, the tensioning wheel 6 is located above the transmission belt 4, and the position adjusting structure of the tensioning wheel 6 is located outside the box body. The tensioning wheel 6 can better ensure the tensioning state of the transmission belt 4 and ensure the stability of transmission.

[0019] Further optimization, the lower end of the tensioning wheel 6 abuts against the inner side of the transmission belt, and the tensioning wheel 6 is in tooth-shaped engagement with the transmission belt 4. The inner side of the transmission belt 4 is provided, which is more beneficial to the compactness of the overall structure, and the tooth-shaped engagement between the tensioning wheel 6 and the transmission belt 4 can better ensure the stability of transmission.

[0020] Similarly, in order to ensure the stability of transmission between the driving gear 11 and the transmission belt 4 and the stability of transmission between the driven gear 31 and the transmission belt 4, the transmission belt is in tooth-shaped engagement with the driving gear 11, the driven gear 31 and the transmission belt 4.

[0021] In addition, the transmission belt 4 is limited to be a belt or a chain, and the transmission belt 4 has tooth shapes that are in engagement with the driving gear 11 and the driven gear 31.

[0022] In order to ensure the gap compensation of the transmission belt in the axial jump during transmission, the driving gear and the driven gear are limited to be provided with gear pads. The gear pad can be used to adjust the tooth side gap to ensure that the gear can normally rotate, and when the gear is fixed, the gear pad can provide additional locking force to prevent the gear from loosening due to vibration.

[0023] By adopting the above technical scheme, the electric motor and the transmission mechanism are integrated to form a simple electric motorcycle one-stage reduction gearbox, the position of the electric motor is set, the electric motor with the largest mass and volume is located at the lower rear end of the entire power device, the center of gravity of the electric motorcycle is relatively lowered, and is located at the center of the vehicle body, which is beneficial to the stability of the overall vehicle.

[0024] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model, and a modification without creative contribution can be made to the embodiment according to needs by a person skilled in the art after reading the specification, but as long as the modification is within the scope of the claims of the utility model, the utility model is protected by the patent law.

Claims

1. A primary reduction gearbox for electric motorcycle, comprising an electric motor, a gearbox, a driving gear, a driven output shaft, a driven gear, an output sprocket and a transmission belt, said electric motor, said driving gear and said driven gear are arranged in said gearbox, said driving gear is fixedly connected to the shaft of said electric motor, said driven gear is fixedly connected to said driven output shaft, said transmission belt connects said driving gear and said driven gear, one end of said driven output shaft extends out of said gearbox, said output sprocket is fixedly connected to the end of said driven output shaft outside said gearbox; characterized in that: The motor is located at the lower rear end of the box, and the driven output shaft is located at the upper front end of the box.

2. The electric motorcycle one stage reduction gearbox as claimed in claim 1, wherein: A tensioning wheel is further included, which is arranged in the box and located above the transmission belt, and a position adjusting structure of the tensioning wheel is located outside the box.

3. The electric motorcycle one-stage reduction gearbox of claim 2, wherein: The lower end of the tensioning wheel abuts against the inner side of the transmission belt, and the tensioning wheel is in tooth-shaped engagement with the transmission belt.

4. The electric motorcycle one stage reduction gearbox of claim 1, wherein: The transmission belt is in tooth-shaped engagement with the driving gear, the driven gear and the transmission belt.

5. The electric motorcycle one stage reduction gearbox as claimed in claim 1, wherein: The transmission belt is a belt or a chain.

6. The electric motorcycle one stage reduction gearbox as claimed in claim 1, wherein: Gear pads are arranged in the driving gear and the driven gear.

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