Lightweight electric motorcycle transmission system and electric motorcycle

Abstract

The utility model relates to the technical field of motorcycles, in particular to a light-weight electric motorcycle transmission system which comprises a motor and a speed reduction assembly arranged outside the motor, the speed reduction assembly comprises a main speed reduction wheel and a driven speed reduction wheel which are in transmission connection, the diameter of the driven speed reduction wheel is larger than that of the main speed reduction wheel, and the main speed reduction wheel is fixed on an output shaft of the motor. The transmission shaft is rotationally connected to the frame, the driven reduction wheel is fixed to the transmission shaft, a driving transmission wheel is further fixed to the transmission shaft, a driven transmission wheel is coaxially fixed to a wheel of the motorcycle, the driving transmission wheel is in transmission connection with the driven transmission wheel, and the diameter of the driven transmission wheel is larger than that of the driving transmission wheel. The electric motorcycle comprises the light-weight transmission system of the electric motorcycle. According to the scheme, the problem that a transmission part of an existing motorcycle with a speed reduction structure is large in weight is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycles, and in particular to a lightweight electric motorcycle transmission system and an electric motorcycle. Background Art

[0002] Existing electric motorcycles, for situations where the output speed requirements are not high and the output torque requirements are low, mostly use a relatively small electric motor as a driver. A small sprocket is fixed on the motor output shaft, and a large sprocket is fixed on one of the motorcycle's tires. The motor drives the rotation of the large sprocket to achieve the movement of the motorcycle. For example, the electric vehicle motor transmission structure with patent publication number CN220363433U, whose application date is August 2023, is disclosed.

[0003] However, for electric motorcycles that have higher speed and torque requirements, such as off-road motorcycles, they often need to be equipped with larger motors. In addition, they also need to be equipped with reducers. For example, CN219420393U, which was applied for in December 2022, is a continuously variable DC brushless reduction motor used on electric motorcycles. The reduction structure is added to improve the power performance of the motorcycle. However, after the transmission part of the current motorcycle is equipped with a reducer, the same motor housing has both the motor body and the reduction structure, which increases the overall weight of the power part of the motorcycle a lot. The current motor is powered by a battery. After the transmission part increases in weight, the energy consumption of the entire vehicle increases. Although existing motorcycles have used lightweight aluminum alloys to replace traditional steel structures in many components for lightweighting, the weight of the transmission part cannot be underestimated, especially the motor of the transmission part. Due to the protection requirements of the internal structure of the motor, the motor housing is still made of steel with higher strength and density. Therefore, the weight of the transmission part is difficult to reduce in current motorcycles. Utility Model Content

[0004] The utility model aims to provide a lightweight electric motorcycle transmission system and an electric motorcycle, so as to solve the problem that the transmission part of the current motorcycle with a deceleration structure is heavy.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A lightweight electric motorcycle transmission system includes a motor and a reduction assembly disposed outside the motor. The reduction assembly includes a main reduction wheel and a secondary reduction wheel in transmission connection. The secondary reduction wheel has a larger diameter than the main reduction wheel. The main reduction wheel is fixed to the output shaft of the motor.

[0007] The principle and advantage of this solution are: when adopting this solution, by setting the reduction assembly outside the motor, the motor housing of the motor only needs to accommodate the motor itself, and the reduction assembly is completely exposed outside the motor, so that when having the same reduction level, the motor housing can be set smaller, thereby reducing the weight of the transmission system.

[0008] In addition, because the reduction assembly is placed outside the motor, the heat generated in the motor is only the heat of the motor itself. The heat brought by the reduction assembly due to transmission can be directly exchanged with the air, so that the motor temperature of the transmission system of this solution is lower when working, which helps to extend the life of the motor.

[0009] Preferably, as an improvement, it also includes a transmission shaft rotatably connected to the frame, a slave wheel is fixed on the transmission shaft, a main transmission wheel is also fixed on the transmission shaft, a slave transmission wheel is coaxially fixed on the wheel of the motorcycle, the main transmission wheel is connected to the slave transmission wheel, the diameter of the slave transmission wheel is larger than the diameter of the main transmission wheel, so that the transmission system completes the drive from the motor to the motorcycle wheel.

[0010] Preferably, as an improvement, the secondary reduction wheel and the main transmission wheel are located on both sides of the wheel, so that the force on the transmission shaft is more uniform.

[0011] Preferably, as an improvement, a connecting shaft is fixed on the frame of the motorcycle, the transmission shaft is rotatably sleeved outside the connecting shaft, and the reduction wheel and the main transmission wheel are both detachably connected to the transmission shaft, which is convenient for maintenance and replacement.

[0012] Preferably, as an improvement, the main reduction wheel and the secondary reduction wheel are connected via a toothed synchronous belt transmission to improve transmission efficiency, reduce replacement costs, and still have good transmission performance in harsh environments.

[0013] Preferably, as an improvement, the center axis of the secondary reduction wheel coincides with the rotation center line of the flat fork, so that the secondary reduction wheel can use the rotation center line of the flat fork.

[0014] Preferably, as an improvement, it further comprises a protective cover for shielding the main reduction wheel, the secondary reduction wheel and the main transmission wheel.

[0015] Preferably, as an improvement, the protective cover includes a front protective cover and a rear protective cover, the front protective cover is fixedly installed and covers the main reduction wheel, and the rear protective cover is fixed on the flat fork and covers the secondary reduction wheel and the main transmission wheel.

[0016] The utility model also provides an electric motorcycle, comprising the lightweight electric motorcycle transmission system.

[0017] Preferably, as an improvement, it further includes front brakes and rear brakes, which are located on the left and right sides of the center line of the vehicle body to avoid tailspin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 of the present utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure after rotation angle.

[0020] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure after removing the front and rear protective covers.

[0021] Figure 4 for Figure 2 Schematic diagram of the three-dimensional structure after removing the front and rear protective covers.

[0022] Figure 5 The first embodiment of the present invention is an axial cross-sectional view showing the connection relationship between the connecting shaft, the transmission shaft, the flat fork and the frame.

[0023] Figure 6 This is a schematic diagram showing the three-dimensional structure of the frame, fork, front and rear brakes on a motorcycle in two dimensions according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The reference numerals in the drawings of the specification include: motor 1, main reduction wheel 2, secondary reduction wheel 3, main transmission wheel 4, connecting shaft 5, transmission shaft 6, secondary transmission wheel 7, flat fork 8, front protective cover 9, rear protective cover 10, front brake 20, rear brake 30, frame 100, and wheel hub 200.

[0026] Example 1

[0027] Combine Figures 1 to 5 As shown, a lightweight electric motorcycle transmission system includes a motor 1, a reduction assembly and a main drive wheel 4. The reduction assembly is located outside the motor 1, and the motor 1 is fixedly mounted on the motorcycle frame 100. The reduction assembly includes a main reduction wheel 2 and a secondary reduction wheel 3 connected by a toothed synchronous belt transmission. The secondary reduction wheel 3 has a larger diameter than the main reduction wheel 2, and the main reduction wheel 2 is fixed to the output shaft of the motor 1.

[0028] The secondary reduction wheel 3 is rotatably connected to the motorcycle frame 100. Specifically, a connecting shaft 5 is fixed to the motorcycle frame 100, and a transmission shaft 6 is rotatably connected to the connecting shaft 5 via a bearing. The secondary reduction wheel 3 is bolted to one end of the transmission shaft 6, and the main transmission wheel 4 is bolted to the other end of the transmission shaft 6. A secondary transmission wheel 7 is coaxially fixed to the rear wheel of the motorcycle (the tire of the rear wheel is not shown in the figure, but the rear wheel hub 200 is shown). The main transmission wheel 4 and the secondary transmission wheel 7 are sprockets, and the main transmission wheel 4 and the secondary transmission wheel 7 are connected by a chain drive. The diameter of the secondary transmission wheel 7 is larger than that of the main transmission wheel 4, so that the transmission system completes the drive from the motor 1 to the motorcycle wheel.

[0029] The secondary reduction wheel 3 and the main transmission wheel 4 are located on both sides of the wheel.

[0030] The flat fork 8 is also rotatably connected to the connecting shaft 5 through a bearing, and the rotation center lines of the flat fork 8 and the transmission shaft 6 coincide with each other.

[0031] The motor 1 further includes a protective cover for shielding the primary reduction gear 2, the secondary reduction gear 3, and the main transmission gear 4. The protective cover includes a front protective cover 9 and a rear protective cover 10. The front protective cover 9 is fixedly mounted on the housing of the motor 1 and covers the primary reduction gear 2. The rear protective cover 10 is fixed on the flat fork 8 and covers both the secondary reduction gear 3 and the main transmission gear 4.

[0032] When this embodiment is used, the power output by the motor 1 is first decelerated by the main reduction wheel 2 and the secondary reduction wheel 3, and then decelerated twice by the main transmission wheel 4 and the secondary transmission wheel 7, thereby ensuring the output torque required by the motorcycle.

[0033] In this embodiment, the reduction gear assembly with the main reduction gear and the secondary reduction gear is arranged outside the motor 1, so that the motor housing of the motor 1 only needs to accommodate the motor 1 itself, and the reduction gear assembly is completely exposed outside the motor 1. Therefore, while having the same reduction gear level, the motor housing can be set smaller, thereby reducing the weight of the transmission system.

[0034] In addition, since the reduction assembly is placed outside the motor 1, the heat generated in the motor 1 is only the heat of the motor 1 itself, and the heat brought by the reduction assembly due to transmission can be directly exchanged with the air, so that the temperature of the motor 1 of the transmission system of this solution is lower when working, which helps to extend the life of the motor 1.

[0035] In addition, in this embodiment, both the reduction wheel 3 and the main transmission wheel 4 are mounted on the transmission shaft 6 which coincides with the rotation center line of the flat fork 8. On the one hand, this improves the utilization rate of the remaining space on the motorcycle; on the other hand, by arranging the transmission shaft 6 here, the distance between the main transmission wheel 4 and the secondary transmission wheel 7 is reduced, thereby reducing the problem in the prior art that the chain of the chain drive is easy to become loose when the chain is too long.

[0036] Example 2

[0037] Combine Figure 6 , the second embodiment provides an electric motorcycle, including the lightweight electric motorcycle transmission system of the first embodiment, and also including a front brake 20 and a rear brake 30, the front brake 20 and the rear brake 30 are located on the left and right sides of the center line of the vehicle body, the front brake 20 is used to brake the front wheel of the wheel, and the rear brake 30 is used to brake the rear wheel of the wheel. The front brake 20 and the rear brake 30 are both disc brakes, and the rear brake 30 and the slave transmission wheel 7 are located on the left and right sides of the rear wheel. In this embodiment, the front brake 20 is located on the left side of the motorcycle, and the rear brake 30 is located on the right side of the motorcycle.

[0038] This embodiment has all the advantages of the first embodiment, and can also avoid the problem of tail-swinging during braking by distributing the front brake 20 and the rear brake 30 on the left and right sides.

[0039] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A lightweight electric motorcycle transmission system, comprising a motor, characterized in that: The motor further comprises a reduction assembly disposed outside the motor, the reduction assembly comprising a main reduction wheel and a secondary reduction wheel in transmission connection, the secondary reduction wheel having a larger diameter than the main reduction wheel, and the main reduction wheel being fixed to the output shaft of the motor; The motorcycle further comprises a transmission shaft rotatably connected to the frame, a secondary transmission wheel fixed on the transmission shaft, a main transmission wheel fixed on the transmission shaft, a secondary transmission wheel coaxially fixed on the wheel of the motorcycle, the main transmission wheel and the secondary transmission wheel are in transmission connection, and the diameter of the secondary transmission wheel is larger than the diameter of the main transmission wheel; The secondary reduction wheel and the main transmission wheel are located on both sides of the wheel; a connecting shaft is fixed on the frame of the motorcycle, the transmission shaft is rotatably sleeved outside the connecting shaft, and the secondary reduction wheel and the main transmission wheel are detachably connected to the transmission shaft.

2. A lightweight electric motorcycle transmission system according to claim 1, characterized in that: The main reduction wheel and the secondary reduction wheel are connected through a toothed synchronous belt transmission.

3. The lightweight electric motorcycle transmission system according to claim 1, characterized in that: The central axis of the reduction wheel coincides with the rotation center line of the flat fork.

4. The lightweight electric motorcycle transmission system according to claim 1, characterized in that: It also includes a protective cover for covering the main reduction wheel, the follower reduction wheel and the main transmission wheel.

5. The lightweight electric motorcycle transmission system according to claim 4, characterized in that: The protective cover comprises a front protective cover and a rear protective cover. The front protective cover is fixedly installed and covers the main reduction wheel. The rear protective cover is fixed on the flat fork and covers the secondary reduction wheel and the main transmission wheel.

6. An electric motorcycle, characterized in that: The invention comprises a lightweight electric motorcycle transmission system according to any one of claims 1 to 5.

7. The electric motorcycle according to claim 6, characterized in that: It also includes front brakes and rear brakes, which are located on the left and right sides of the center line of the vehicle body.

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