Power rear fork drive system for pure electric motorcycles

Abstract

The present invention discloses a power rear fork drive system for a pure electric motorcycle, which includes a rear fork holder, one side of the rear fork holder connected to a frame, and two ends of the other side respectively equipped with a power rear fork housing and a support rear fork, an output shaft rotatably connected between the power rear fork housing and the support rear fork, a motor cavity formed in the power rear fork housing, a gear cavity formed on the side of the motor cavity close to the output shaft, a drive motor disposed in the motor cavity, a driving gear shaft and a driven gear disposed in the gear cavity which mesh with each other, and the driving gear shaft and the driven gear are transmitted through a reduction mechanism, the driving gear shaft being connected to the motor shaft of the drive motor, one end of the output shaft extending into the gear cavity, and the driven gear being connected to the output shaft, which has a shorter power transmission path, higher efficiency and better sealing performance, and does not require the battery volume to be sacrificed, allowing for a larger battery to be installed, increasing the driving range and reducing the performance degradation and waterproofing problems caused by the increased moment of inertia of the hub motor.

Description

[Technical Field]

[0001] The present invention relates to the technical field of electric motorcycle drives, and more particularly to a power rear fork drive system for a purely electric motorcycle. [Background technology]

[0002] In the field of electric drives for motorcycles, structural types such as hub motors and mid-mounted motors are currently commonly used. When driven by a hub motor, the structure is simple, but the hub motor is heavy, has a large moment of inertia, and is inefficient, which not only affects the vehicle's handling performance but also increases material costs. In addition, hub motors have poor waterproof sealing, so when driven by a mid-mounted motor, the transmission path is long and occupies the limited space of the motorcycle itself, sacrificing the volume of the battery and reducing the vehicle's range.

[0003] Currently, a side-mounted motor is used for driving the vehicle, but the transmission system has a complicated structure, which affects transmission efficiency and manufacturing costs. Summary of the Invention [Problem to be solved by the invention]

[0004] In response to the deficiencies of the prior art, the present invention provides a power rear fork drive system for a pure electric motorcycle with higher power transmission efficiency, smaller occupancy volume, stable performance, and high waterproofness. [Means for solving the problem]

[0005] To achieve the above object, the present invention provides a technical solution for a power rear fork drive system of a pure electric motorcycle, comprising a rear fork holder, one side of the rear fork holder connected to a frame, and a power rear fork housing and a support rear fork respectively provided at both ends of the other side, an output shaft rotatably connected between the power rear fork housing and the support rear fork, a motor cavity provided in the power rear fork housing, a gear cavity provided on a side of the motor cavity close to the output shaft, a drive motor provided in the motor cavity, a driving gear shaft and a driven gear meshing with each other provided in the gear cavity, and the driving gear shaft and the driven gear are reduced and transmitted, the driving gear shaft is connected to the motor shaft of the drive motor, one end of the output shaft extends into the gear cavity, and the driven gear is connected to the output shaft.

[0006] Furthermore, a sealing hole is provided between the motor cavity and the gear cavity, an end of the motor shaft extends into the sealing hole, and an oil seal is provided between the end of the motor shaft and the sealing hole.

[0007] Furthermore, a protruding first bearing hole is provided on the inner wall of the motor cavity near the gear cavity, the first bearing hole corresponds to the sealing hole, and a motor support bearing is provided between the motor shaft and the first bearing hole.

[0008] Furthermore, the end of the output shaft extending into the gear cavity is close to the inner wall of the gear cavity, a protruding second bearing hole is provided in the inner wall of the gear cavity, the end of the output shaft extends into the second bearing hole, and an output support bearing is provided between the end of the output shaft and the second bearing hole.

[0009] Furthermore, the driven gear is connected to an end of an output shaft extending into the gear cavity, and a retaining ring is provided on the end of the output shaft, and the retaining ring contacts the driven gear.

[0010] Furthermore, the power rear fork housing and the rear fork holder are fixed and connected with bolts and nuts.

[0011] Additionally, both the power rear fork housing and the support rear fork are provided with several reinforcing ribs. [Effects of the Invention]

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the drive motor in the motor cavity starts, rotates the driving gear shaft, then rotates the driven gear, and finally rotates the output shaft, thereby driving the drive wheels; both the drive motor and the transmission system are integrated into the power rear fork housing on one side of the drive wheels, which shortens the power transmission path, improves efficiency, and enhances sealing performance; there is no need to sacrifice battery volume, allowing for a larger battery to be installed, increasing the driving range and reducing the performance degradation and waterproofing problems caused by the increased moment of inertia of the hub motor. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of the external structure of the power rear fork drive system of a pure electric motorcycle of the present invention; FIG. [Figure 2] 1 is a schematic diagram of the internal structure of a power rear fork drive system of a pure electric motorcycle according to a first embodiment of the present invention; FIG. [Figure 3] 2 is a schematic diagram of the internal structure of a power rear fork drive system of a pure electric motorcycle according to a second embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] In the description of the present invention, the orientations and positional relationships indicated by directional terms, such as "center," "horizontal (X)," "longitudinal (Y)," "vertical (Z)," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," etc., are based on the orientations or positional relationships shown in the drawings and are intended merely to make the present invention easier to explain and simplify the description. They do not indicate or imply that the indicated devices or elements necessarily have a specific orientation, or are configured and operate in a specific orientation, and therefore should not be understood as limiting the specific protection scope of the present invention.

[0015] Furthermore, terms such as "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features, whereby a feature qualified by "first" or "second" may explicitly or implicitly include one or more of said features, and in the description of the present invention, unless otherwise expressly and specifically limited, "plurality", "several" means two or more than two.

[0016] The present invention will be further explained with reference to FIGS.

[0017] Example 1: A power rear fork drive system for a pure electric motorcycle includes a rear fork holder 1, one side of the rear fork holder 1 is connected to a frame, and a power rear fork housing 2 and a support rear fork 3 are respectively provided at both ends of the other side, an output shaft 4 is rotatably connected between the power rear fork housing 2 and the support rear fork 3, a motor cavity 5 is provided in the power rear fork housing 2, a gear cavity 6 is provided on the side of the motor cavity 5 close to the output shaft 4, a drive motor 7 is provided in the motor cavity 5, a driving gear shaft 8 and a driven gear 9 that mesh with each other are provided in the gear cavity 6, and the driving gear shaft 8 and the driven gear 9 are transmitted at a reduced speed, the driving gear shaft 8 is connected to the motor shaft of the drive motor 7, one end of the output shaft 4 extends into the gear cavity 6, and the driven gear 9 is connected to the output shaft 4.

[0018] Specifically, the output shaft 4 is provided with a driving wheel.

[0019] As shown in Figures 1 and 2, the drive motor 7 in the motor cavity 5 starts, rotating the driving gear shaft 8, which then rotates the driven gear 9, and finally the output shaft 4, thereby driving the drive wheels. Because both the drive motor 7 and the transmission system are integrated into the power rear fork housing on one side of the drive wheels, the power transmission path is shorter, the efficiency is higher, and the sealing performance is improved. There is no need to sacrifice the battery volume, so a larger battery can be installed, increasing the driving range and reducing the performance degradation and waterproofing problems caused by the increased moment of inertia of the hub motor.

[0020] As shown in FIG. 2, in this embodiment, a sealing hole 10 is preferably provided between the motor cavity 5 and the gear cavity 6, the end of the motor shaft extends into the sealing hole 10, and an oil seal 11 is provided between the end of the motor shaft and the sealing hole 10, which prevents the lubricating oil in the gear cavity 6 from flowing into the motor cavity 5.

[0021] As shown in FIG. 2, in this embodiment, a protruding first bearing hole 12 is preferably provided on the inner wall of the motor cavity 5 near the gear cavity 6, and the first bearing hole 12 corresponds to the sealing hole 10. A motor support bearing 13 is provided between the motor shaft and the first bearing hole 12, so that both ends of the motor shaft and both ends of the driving gear shaft are all supported by bearings, making their rotation more stable.

[0022] Specifically, a bearing oil retaining ring corresponding to the motor support bearing 13 is provided in the first bearing hole 12, and the bearing oil retaining ring is located on the side of the motor support bearing 13 facing the oil seal 11.

[0023] As shown in FIG. 2, in this embodiment, preferably, the end of the output shaft extending into the gear cavity 6 is close to the inner wall of the gear cavity 6, and a protruding second bearing hole 14 is provided on the inner wall of the gear cavity 6, and the end of the output shaft 4 extends into the second bearing hole 14, and an output support bearing 15 is provided between the end of the output shaft 4 and the second bearing hole 14, so that the output shaft 4 on both sides of the driven gear 9 is provided with a support bearing, and the rotation of the driven gear 9 is more stable.

[0024] As shown in FIGS. 1 and 2, in this embodiment, the power rear fork housing 2 and the rear fork holder 1 are preferably fixed and connected with bolts and nuts, making it easy to attach and detach the drive wheel.

[0025] As shown in FIGS. 1 and 2, in this embodiment, preferably, both the power rear fork housing 2 and the support rear fork 3 are provided with some reinforcing ribs.

[0026] Example 2: A power rear fork drive system for a pure electric motorcycle includes a rear fork holder 1, one side of the rear fork holder 1 is connected to a frame, and a power rear fork housing 2 and a support rear fork 3 are respectively provided at both ends of the other side, an output shaft 4 is rotatably connected between the power rear fork housing 2 and the support rear fork 3, a motor cavity 5 is provided in the power rear fork housing 2, a gear cavity 6 is provided on the side of the motor cavity 5 close to the output shaft 4, a drive motor 7 is provided in the motor cavity 5, a driving gear shaft 8 and a driven gear 9 that mesh with each other are provided in the gear cavity 6, and the driving gear shaft 8 and the driven gear 9 are transmitted at a reduced speed, the driving gear shaft 8 is connected to the motor shaft of the drive motor 7, one end of the output shaft 4 extends into the gear cavity 6, and the driven gear 9 is connected to the output shaft 4.

[0027] As shown in Figures 1 and 3, the drive motor 7 in the motor cavity 5 starts, rotating the driving gear shaft 8, which then rotates the driven gear 9, and finally the output shaft 4, thereby driving the drive wheels. Because both the drive motor 7 and the transmission system are integrated into the power rear fork housing on one side of the drive wheels, the power transmission path is shorter, the efficiency is higher, and the sealing performance is improved. There is no need to sacrifice the battery volume, so a larger battery can be installed, increasing the driving range and reducing the performance degradation and waterproofing problems caused by the increased moment of inertia of the hub motor.

[0028] As shown in FIG. 3 , in this embodiment, a sealing hole 10 is preferably provided between the motor cavity 5 and the gear cavity 6, the end of the motor shaft extends into the sealing hole 10, and an oil seal 11 is provided between the end of the motor shaft and the sealing hole 10, which prevents the lubricating oil in the gear cavity 6 from flowing into the motor cavity 5.

[0029] As shown in FIG. 3, in this embodiment, preferably, the driven gear 9 is connected to the end of the output shaft 4 extending into the gear cavity 6, and a retaining ring is provided on the end of the output shaft 4, which contacts the driven gear 9 to prevent the driven gear 9 from falling off.

[0030] As shown in FIG. 3, in this embodiment, the first bearing hole 12 and the second bearing hole 14 of the original embodiment 1 are eliminated, and at the same time, the corresponding bearings in the bearing holes are also eliminated, so that the entire drive system is supported by only four bearings, which simplifies the configuration and reduces the manufacturing costs.

[0031] As shown in FIGS. 1 and 3, in this embodiment, the power rear fork housing 2 and the rear fork holder 1 are preferably fixed and connected with bolts and nuts, making it easy to attach and detach the drive wheel.

[0032] As shown in FIG. 1 and FIG. 3, in this embodiment, preferably, both the power rear fork housing 2 and the support rear fork 3 are provided with some reinforcing ribs.

[0033] The above content is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions that fall within the concept of the present invention are within the protection scope of the present invention. It should be noted that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should be considered within the protection scope of the present invention. [Explanation of symbols]

[0034] 1 rear fork holder 2 Power rear fork housing 3 Support rear fork 4 output shaft 5 Motor Cavity 6 Gear Cavity 7 Drive motor 8. Main gear shaft 9 Driven gear 10 Sealing hole 11 Oil seal 12 1st bearing hole 13 Motor support bearing 14 2nd bearing hole 15 Output support bearing 16 Retaining ring 17 Motor shaft.

Claims

1. a power rear fork drive system for a pure electric motorcycle, the power rear fork drive system including a rear fork holder, one side of the rear fork holder connected to a frame and a power rear fork housing and a support rear fork respectively provided at both ends of the other side, an output shaft rotatably connected between the power rear fork housing and the support rear fork, a motor cavity provided in the power rear fork housing, a gear cavity provided on a side of the motor cavity close to the output shaft, a drive motor provided in the motor cavity, a driving gear shaft and a driven gear meshing with each other provided in the gear cavity, the driving gear shaft and the driven gear being reduced and transmitted, the driving gear shaft connected to a motor shaft of the drive motor, one end of the output shaft extending into the gear cavity, and the driven gear connected to the output shaft.

2. 2. The power rear fork drive system of a pure electric motorcycle as described in claim 1, wherein a sealing hole is provided between the motor cavity and the gear cavity, an end of the motor shaft extends into the sealing hole, and an oil seal is provided between the end of the motor shaft and the sealing hole.

3. 3. The power rear fork drive system of a pure electric motorcycle according to claim 2, wherein a protruding first bearing hole is provided on an inner wall of the motor cavity near the gear cavity, the first bearing hole corresponds to a sealing hole, and a motor support bearing is provided between the motor shaft and the first bearing hole.

4. 4. The power rear fork drive system of a pure electric motorcycle according to claim 3, wherein the end of the output shaft extending into the gear cavity is close to the inner wall of the gear cavity, and a protruding second bearing hole is provided on the inner wall of the gear cavity, the end of the output shaft extends into the second bearing hole, and an output support bearing is provided between the end of the output shaft and the second bearing hole.

5. 4. The power rear fork drive system of a pure electric motorcycle as claimed in claim 3, wherein the driven gear is connected to an end of an output shaft extending into the gear cavity, and a retaining ring is provided on the end of the output shaft, and the retaining ring contacts the driven gear.

6. 6. The power rear fork drive system for a pure electric motorcycle according to claim 1, wherein the power rear fork housing and the rear fork holder are fixedly connected with bolts and nuts.

7. The power rear fork driving system of a pure electric motorcycle as claimed in claim 6, characterized in that both the power rear fork housing and the support rear fork are provided with some reinforcing ribs.

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