Electric motorcycle transmission system

Abstract

The utility model discloses an electric motorcycle transmission system, including a vehicle body, a rear wheel rotatably mounted on the vehicle body, and a motor mounted in the middle of the vehicle body, a first chain disc is mounted on the motor output shaft, a second chain disc and a third chain disc coaxially fixed are arranged on the vehicle body, and a fourth chain disc is fixed on the rear wheel, wherein the first chain disc and the second chain disc are sleeved with a first chain to form a primary reduction transmission, and the third chain disc and the fourth chain disc are sleeved with a second chain to form a secondary reduction transmission; in addition, the installation position of the motor on the vehicle body is adjustable so that the center distance between the first chain disc and the second chain disc is adjustable, and the first chain disc is detachably assembled on the motor output shaft. The beneficial effects are: a larger reduction ratio is provided by the design of the primary and secondary reduction transmissions, and the design of the adjustable motor position and the detachable first chain disc can achieve the adjustment of the reduction ratio by replacing the first chain discs of different sizes without changing the length of the first chain.

Description

Technical Field

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

[0002] Electric motorcycles are electric motorcycles that mainly use batteries as their power source, and the electric motor converts electrical energy into mechanical energy.

[0003] In the prior art, electric motors for electric motorcycles are mainly divided into hub motors, side-mounted motors and mid-mounted motors. Among them, the hub motor is arranged inside the rear wheel of the motorcycle and directly drives the rear wheel of the motorcycle to rotate, but due to the influence of the wheel structure, the power generated by the hub motor is relatively insufficient; the side-mounted motor is installed on one side of the rear wheel of the motorcycle to directly drive the rear wheel of the motorcycle to rotate, but due to the influence of its installation structure, the stability of the motorcycle when driving is poor; compared with the first two power transmissions, most people prefer mid-mounted motors. The installation method of the mid-mounted motor is the same as that of a traditional motorcycle. Both are installed in the middle of the motorcycle body and are synchronously connected to the rear wheel through a chain.

[0004] The mid-mounted motor is also a more popular drive system layout for off-road motorcycles. Given the particularity of its application scenarios, the power system needs to frequently provide low-speed, high-torque operating conditions, so this type of motorcycle has higher requirements for the reduction ratio. In the prior art, the mid-mounted motor and the rear wheel of the electric motorcycle are only driven by a chain, which can only provide one output transmission ratio, which seriously restricts the performance of the electric off-road motorcycle. Utility Model Content

[0005] In view of this, the utility model provides an electric motorcycle transmission system to solve the technical defect of the current transmission system with a single reduction ratio.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] An electric motorcycle transmission system comprises a vehicle body, a rear wheel rotatably mounted on the vehicle body, and a motor mounted in the middle of the vehicle body, characterized in that a first chain disc is mounted on the motor output shaft, a second chain disc and a third chain disc coaxially fixedly connected are provided on the vehicle body, a fourth chain disc is fixedly provided on the rear wheel, a first chain is sleeved on the first and second chain discs to form a primary reduction transmission, a second chain is sleeved on the third and fourth chain discs to form a secondary reduction transmission; the mounting position of the motor on the vehicle body is adjustable so that the center distance between the first and second chain discs is adjustable, and the first chain disc is detachably assembled on the motor output shaft.

[0008] By adopting the above structure and through the design of two-stage reduction transmission, a larger reduction ratio and a higher output torque are achieved compared with the traditional one-stage transmission; in addition, the motor position is adjustable and the first chain plate can be detachably installed, so that the reduction ratio can be adjusted by replacing the first chain plates of different sizes without changing the length of the first chain, which can meet the rider's needs for different reduction ratios.

[0009] As a preferred embodiment, the motor is fixed on the lower side of the middle part of the vehicle body. The above structure is adopted to facilitate the installation of the electric motorcycle transmission system.

[0010] Preferably, mounting plates are provided at both ends of the motor axis, one end of the mounting plate is rotatably connected to the vehicle body, the other end is provided with an arc hole, and bolts fastened to the vehicle body are arranged at the position of the arc hole. With the above structure, the center distance between the first chain plate and the second chain plate can be adjusted by rotating the motor, saving the assembly space of the motor.

[0011] Preferably, a support shaft is installed on the side of the vehicle body, and the second chain disc and the third chain disc are synchronously rotated and sleeved on the support shaft through a positioning support block. The above structure ensures that the second chain disc and the third chain disc rotate synchronously, and also makes the assembly structure between the second chain disc and the third chain disc more compact and stable.

[0012] Preferably, the diameter of the second chain disc is larger than that of the first chain disc, and the diameter of the fourth chain disc is larger than that of the third chain disc. The above structure ensures that the two reduction transmissions can realize reduction transmission and provide a reduction ratio.

[0013] Preferably, a first protective shell is provided on the outer side of the first chain disk, and the first protective shell can cover the first chain disk, the second chain disk and the first chain, and a second protective shell is provided on the top of the fourth chain disk. With the above structure, the chain disk and chain can be protected to prevent mud, sand or weeds from intervening and affecting the service life of the chain disk and chain. In addition, it can also prevent the rider's trouser legs from being hinged between the chain disks and chains, causing personal safety.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The electric motorcycle transmission system provided by the utility model realizes a larger reduction ratio and a higher reduction torque through the design of a two-stage reduction mechanism compared with the traditional one-stage reduction mechanism; in addition, the motor position is adjustable and the first chain plate is detachable, so that the center distance between the first chain plate and the second chain plate can be changed. Under the premise of not changing the length of the first chain, the reduction ratio can be adjusted by replacing the first chain plates of different sizes, which can meet the rider's needs for different reduction ratios.

[0016] 2. The motor adopts the rotation adjustment method, which saves the assembly space of the motor; the second chain plate and the third chain plate realize synchronous rotation through the positioning support block, which also makes the overall transmission structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the transmission system installed on the electric motorcycle;

[0018] Figure 2 It is a structural schematic diagram of the electric motorcycle transmission system;

[0019] Figure 3 It is a structural schematic diagram of the motor 3;

[0020] Figure 4 It is an exploded view of the mounting structure of the second chain disc 5 and the third chain disc 6. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with embodiments and drawings.

[0022] The directions such as “front”, “rear”, “up” and “down” mentioned in this embodiment are directions when the motorcycle is actually in use.

[0023] like Figure 2 and Figure 4 As shown, an electric motorcycle transmission system includes a vehicle body 1, a rear wheel 2 rotatably mounted on the vehicle body 1, and a motor 3 mounted in the middle of the vehicle body 1. In this embodiment, a first chain disc 4 is mounted on the output shaft of the motor 3, a coaxially fixed second chain disc 5 and a third chain disc 6 are mounted on the side of the vehicle body 1, and a fourth chain disc 7 is fixedly mounted on the side of the rear wheel 2 corresponding to the first chain disc 4, wherein a first chain 8 is sleeved on the first chain disc 4 and the second chain disc 5 to form a primary reduction transmission, and a second chain 9 is sleeved on the third chain disc 6 and the fourth chain disc 7 to form a secondary reduction transmission. In addition, in this embodiment, the installation position of the motor 3 on the vehicle body 1 is adjustable so that the center distance between the first chain disc 4 and the second chain disc 5 is adjustable, and the first chain disc 4 is also assembled on the output shaft of the motor 3 in a detachable mounting manner.

[0024] Based on the above structure, through the design of the two-stage reduction transmission, compared with the traditional one-stage reduction transmission between the motor 3 and the rear wheel 2 only through the chain, a larger reduction ratio and a higher output torque are achieved. In addition, the installation position of the motor 3 is adjustable and the first chain plate 4 is detachable. Under the premise of not changing the length of the first chain 8, the reduction transmission ratio of the transmission system can be further adjusted by replacing the first chain plate 4 with different diameters, thereby meeting the rider's needs for different reduction transmission ratios, and at the same time, the reduction ratio of the electric motorcycle can be adjusted according to different riding environments.

[0025] like Figure 1 As shown, in this embodiment, in order to facilitate the installation of various components of the transmission system, the installation position of the motor 3 is located at the lower middle side of the vehicle body 1. Figure 2 and Figure 3 , the motor 3 is formed with mounting plates 3a at both ends of the axis, one end of the mounting plate 3a is provided with a mounting hole 3a2 for rotational connection with the vehicle body 1, and the other end is formed with an arc hole 3a1, and bolts 3b for fastening connection with the vehicle body 1 are arranged at the position of the arc hole 3a1. Based on this, by loosening the bolts 3b at both ends of the mounting plate 3a, the motor 3 can be rotated and adjusted within the stroke range of the arc hole 3a1 with the mounting hole 3a2 as the center of the circle, and then the first chain plate 4 is replaced accordingly, so that the position of the motor 3 can be adjusted by rotation without changing the length of the first chain 8, and the first chain plate 4 of the corresponding size can be installed to adjust the reduction ratio of the transmission system. With such a design, the position of the motor 3 is adjusted by rotation, which greatly saves the assembly space required for the assembly of the motor 3, making the overall structure of the electric motorcycle transmission system more compact.

[0026] Specifically, when the motor 3 rotates toward the front of the vehicle, the distance between the output shaft of the motor 3 and the second chain disc 5 increases. Since the length of the first chain 8 remains unchanged, in order to ensure assembly, the original first chain disc 4 needs to be replaced with a first chain disc 4 of a smaller size. Since the reduction ratio of the chain is affected by the diameter of the chain disc, when the size of the first chain disc 4 decreases, the reduction ratio of the entire transmission system is increased. Similarly, when the motor 3 rotates toward the rear of the vehicle, the distance between the output shaft of the motor 3 and the second chain disc 5 decreases. Since the length of the first chain 8 remains unchanged, in order to ensure assembly, the original first chain disc 4 needs to be replaced with a first chain disc 4 of a larger size. At this time, the reduction ratio of the entire transmission system is reduced. By adjusting the motor 3, the rider's needs for different reduction ratios are met, and the rider can also adjust the appropriate reduction ratio in the face of different riding environments.

[0027] like Figure 4 As shown, in this embodiment, a support shaft 10 is fixedly installed on the side of the vehicle body 1, and the second chain disc 5 and the third chain disc 6 are both rotatably installed on the support shaft 10, and a positioning support block 11 is also installed between the second chain disc 5 and the third chain disc 6 to ensure that the second chain disc 5 and the third chain disc 6 rotate synchronously. In order to ensure that the second chain disc 5, the positioning support block 11 and the third chain disc 6 are tightly assembled, they are additionally fastened by bolts. Such a design is not only easy to install, but also makes the synchronization of the second chain disc 5 and the third chain disc 6 good, and the structure is also very compact.

[0028] In this embodiment, the diameter of the second chain plate 5 must be larger than the diameter of the first chain plate 4, and the diameter of the fourth chain plate 7 must be larger than the diameter of the third chain plate 6. Only in this way can the first-stage reduction transmission and the second-stage reduction transmission be able to achieve deceleration, and the electric motorcycle transmission system can provide a sufficient reduction ratio.

[0029] For example Figure 1 As shown, a first protective shell 12 is fixedly installed on the outside of the first chain disk 4, and the first protective shell 12 can cover the first chain disk 4, the second chain disk 5 and the first chain 8. A second protective shell 13 is fixedly installed on the top of the fourth chain disk 7, and the second protective shell 13 can cover the top of the fourth chain disk 7 and part of the second chain 9. In this embodiment, the first protective shell 12 and the second protective shell 13 are fixedly installed by bolts. Such a design can effectively prevent weeds or mud from intervening between the chain disk and the chain to affect the service life of the chain disk and the chain. At the same time, it can also effectively prevent the rider's trouser legs from being hinged between the chain disk and the chain to cause personal safety.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. An electric motorcycle transmission system, comprising a vehicle body (1), a rear wheel (2) rotatably mounted on the vehicle body (1), and a motor (3) mounted in the middle of the vehicle body (1), characterized in that: A first chain plate (4) is mounted on the output shaft of the motor (3); a second chain plate (5) and a third chain plate (6) are coaxially fixedly mounted on the vehicle body (1); a fourth chain plate (7) is fixedly mounted on the rear wheel (2); a first chain (8) is sleeved on the first chain plate (4) and the second chain plate (5) to form a primary reduction transmission; a second chain (9) is sleeved on the third chain plate (6) and the fourth chain plate (7) to form a secondary reduction transmission; The installation position of the motor (3) on the vehicle body (1) is adjustable so that the center distance between the first chain plate (4) and the second chain plate (5) is adjustable, and the first chain plate (4) is detachably mounted on the output shaft of the motor (3).

2. The electric motorcycle transmission system according to claim 1, characterized in that: The motor (3) is fixed on the lower side of the middle part of the vehicle body (1).

3. The electric motorcycle transmission system according to claim 1, characterized in that: The motor (3) is provided with mounting plates (3a) at both axial ends. One end of the mounting plate (3a) is rotatably connected to the vehicle body (1), and the other end is provided with an arc-shaped hole (3a1). Bolts that are fastened to the vehicle body (1) are arranged at the position of the arc-shaped hole (3a1).

4. The electric motorcycle transmission system according to claim 1, characterized in that: A support shaft (10) is installed on the side of the vehicle body (1), and the second chain plate (5) and the third chain plate (6) are synchronously rotated and sleeved on the support shaft (10) via a positioning support block (11).

5. The electric motorcycle transmission system according to claim 1, characterized in that: The diameter of the second chain disk (5) is greater than the diameter of the first chain disk (4), and the diameter of the fourth chain disk (7) is greater than the diameter of the third chain disk (6).

6. The electric motorcycle transmission system according to claim 1, characterized in that: A first protective shell (12) is provided on the outside of the first chain disk (4), and the first protective shell (12) is capable of covering the first chain disk (4), the second chain disk (5) and the first chain (8), and a second protective shell (13) is provided on the top of the fourth chain disk (7).

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