Motorcycle wheel-side dual motor drive system

Abstract

The present invention discloses a wheel-side dual motor drive system for motorcycles, which includes a rear fork holder connected to a frame, with a left power rear fork housing and a right power rear fork housing installed on either side of the rear fork holder, a left drive motor installed in the left power rear fork housing, and a right drive motor installed in the right power rear fork housing, both of which are connected to the output shaft of the drive wheels, with one-way transmission between the right drive motor and the output shaft. The conventional mid-mounted motor or hub motor is divided into two small wheel-side motors, which makes the overall weight distribution of the vehicle more reasonable and improves handling performance. The motors occupy less space, allowing for the use of larger batteries to increase the driving range, and the motors are more waterproof. The left and right independent drives save power, and the integrated design makes the overall appearance of the vehicle more harmonious and beautiful.

Description

[Technical Field]

[0001] The present invention relates to the technical field of motorcycle driving, and more particularly to a wheel-side dual motor driving system for a pure electric motorcycle. [Background technology]

[0002] With the development and widespread use of automobile electrification technology, electrification technology has gradually expanded to other fields, such as the electrification of ships, the electrification of construction machinery, pure electric motorcycles, etc. Up until now, in the motorcycle industry, electric drive has mostly been applied to small-displacement vehicle types such as electric bicycles and scooters, but in recent years, electric drive technology has gradually been applied to large motorcycles.

[0003] Currently, in the field of electric motorcycle drives, hub motors and mid-mounted motors are commonly used. Hub motors have a simple structure, but they are heavy and inefficient, which not only affect the overall vehicle's operating performance, but also increase material costs and provide poor waterproof sealing. Furthermore, mid-mounted motors have long transmission routes and occupy limited battery space, thereby shortening the vehicle's overall driving range. Summary of the Invention

[0004] To overcome the deficiencies of the prior art, the present invention provides a wheel-side dual motor drive system for motorcycles, which splits the conventional mid-mounted motor or hub motor into two small wheel-side motors, thereby realizing innovation in the drive system of motorcycles and providing significant advantages.

[0005] To achieve the above object, the present invention provides a technical solution for a wheel-side dual motor drive system for a motorcycle, which includes a rear fork holder connected to a frame, with a left power rear fork housing and a right power rear fork housing installed on either side of the rear fork holder, a left drive motor installed in the left power rear fork housing, and a right drive motor installed in the right power rear fork housing, both of which are transmission-connected to the output shaft of the drive wheel, and there is one-way transmission between the right drive motor and the output shaft.

[0006] Furthermore, a left transmission mechanism is installed between the left driving motor and the driving wheel, and the left transmission mechanism includes a left driving gear shaft and a left driven gear, the left driving gear shaft is connected to the left driving motor, the left driven gear is connected to the output shaft, and the left driving gear shaft is meshed with the left driven gear.

[0007] Furthermore, a right transmission mechanism is installed between the right drive motor and the drive wheel, and the right transmission mechanism includes a right driving gear shaft, a right driven gear and a one-way clutch, the right driving gear shaft is connected to the right drive motor, the right driven gear is connected to the one-way clutch, the right driving gear shaft is meshed with the right driven gear, and the one-way clutch is connected to the output shaft.

[0008] Furthermore, a female spline sleeve is installed on the rotating portion of the output shaft located inside the right power rear fork housing, a corresponding male spline is installed on the rotating portion of the output shaft, the right driven gear is connected to the female spline sleeve, and the one-way clutch is located between the right driven gear and the female spline sleeve.

[0009] Furthermore, a lock nut is threadedly engaged with the end of the rotating portion of the output shaft that is located inside the right power rear fork housing, and the lock nut is in contact with the female spline sleeve.

[0010] Furthermore, a needle roller bearing is installed between the right driven gear and the output shaft.

[0011] Furthermore, a spacer is installed between the output shaft and the wheel, and one end of the spacer is in contact with the female spline sleeve.

[0012] Furthermore, the left and right power rear fork housings are both connected to the rear fork holder via bolts and nuts.

[0013] Compared with the prior art, the present invention has the following advantageous effects: the left drive motor is the main drive unit and the right drive motor is the auxiliary drive unit, i.e., the left drive motor is responsible for all power output; as long as the vehicle needs to run, the left drive motor is always started, and the right drive motor can be started as needed to provide auxiliary drive to the drive wheels; by dividing the conventional mid-mounted motor or hub motor into two small wheel-side motors, the overall weight distribution of the vehicle is more reasonable, the handling performance is improved, the motor's occupied space is reduced, larger batteries can be installed to increase the driving range, and performance degradation and waterproofing issues caused by the increased rotational inertia of the hub motor are alleviated; the left and right independent drive and control allow the entire vehicle to operate in a more energy-efficient state; and the integrated design makes the overall appearance of the vehicle more harmonious and beautiful. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram of the three-dimensional structure of the wheel-side dual motor drive system of the motorcycle of the present invention; FIG. [Figure 2] FIG. 1 is a front cross-sectional view of the motorcycle wheel-side dual motor drive system of the present invention. [Figure 3] FIG. 3 is an enlarged view of part A in FIG. 2. [Figure 4] 1 is a side cross-sectional view of the motorcycle wheel-side dual motor drive system of the present invention; FIG. [Figure 5]1 is a structural schematic diagram of the left power rear fork housing of the wheel-side dual motor drive system of the motorcycle of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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.

[0016] 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" and "some" mean two or more than two.

[0017] The present invention will be further explained with reference to FIGS.

[0018] A wheel-side dual motor drive system for a motorcycle includes a rear fork holder 1 connected to a frame, a left power rear fork housing 2 and a right power rear fork housing 3 installed on either side of the rear fork holder 1, a left drive motor 4 installed in the left power rear fork housing 2, and a right drive motor 5 installed in the right power rear fork housing 3, both of which are connected to an output shaft 7 of a drive wheel 6, and power is transmitted in one direction between the right drive motor 5 and the output shaft 7.

[0019] As shown in FIG. 2 , in this embodiment, a left transmission mechanism is preferably installed between the left driving motor 4 and the driving wheel 6, and the left transmission mechanism includes a left driving gear shaft 8 and a left driven gear 9. The left driving gear shaft 8 is connected to the left driving motor 4, and the left driven gear 9 is connected to the output shaft 7, and the left driving gear shaft 8 is meshed with the left driven gear 9.

[0020] As shown in FIG. 2 , in this embodiment, preferably, a right transmission mechanism is installed between the right driving motor 5 and the driving wheel 6, and the right transmission mechanism includes a right driving gear shaft 10, a right driven gear 11, and a one-way clutch 12, and the right driving gear shaft 10 is connected to the right driving motor 5, the right driven gear 11 is connected to the one-way clutch 12, the right driving gear shaft 10 is meshed with the right driven gear 11, and the one-way clutch 12 is connected to the output shaft 7.

[0021] In this embodiment, preferably, the meshing between the left driving gear shaft 8 and the left driven gear 9, and the meshing between the right driving gear shaft 10 and the right driven gear 11 are both helical gear meshing.

[0022] As shown in Figures 2 and 3, in this embodiment, preferably, a female spline sleeve 13 is installed on the rotating portion of the output shaft 7 located inside the right power rear fork housing 3, a corresponding male spline is installed on the rotating portion of the output shaft 7, the right driven gear 11 is connected to the female spline sleeve 13, and the one-way clutch 12 is located between the right driven gear 11 and the female spline sleeve 13.

[0023] In this embodiment, preferably, a bearing is installed between the left driving gear shaft 8 and the left power rear fork housing 2, a bearing is installed between the part of the output shaft 7 located inside the left power rear fork housing 2 and the left power rear fork housing 2, a bearing is installed between the right driving gear shaft 10 and the right power rear fork housing 3, a bearing is installed between the female spline sleeve 13 and the right power rear fork housing 3, and oil seals are installed at both the input end and the output end transmitted by the gears inside the power rear fork housing.

[0024] As shown in FIG. 3, in this embodiment, a lock nut 14 is preferably threaded onto the end of the rotating portion of the output shaft 7 that is located inside the right power rear fork housing 3, and the lock nut 14 is in contact with the female spline sleeve 13.

[0025] As shown in FIG. 3, in this embodiment, a needle roller bearing 15 is preferably installed between the right driven gear 11 and the output shaft 7 to facilitate support of the right driven gear 11 and relative rotation between the female spline sleeve 13 and the right driven gear 11.

[0026] As shown in FIG. 3, in this embodiment, a spacer 16 is preferably installed between the output shaft 7 and the drive wheels 6, with one end of the spacer 16 contacting the female spline sleeve 13. Through cooperation between the spacer 16 and the spline sleeve, the drive wheels 6 are sandwiched between the left power rear fork housing 2 and the right power rear fork housing 3, preventing relative rotation of the drive wheels 6 with respect to the output shaft 7.

[0027] As shown in FIG. 2, in this embodiment, preferably, the left power rear fork housing 2 and the right power rear fork housing 3 are both connected to the rear fork holder 1 via bolts and nuts, which facilitates the attachment and detachment of the drive wheel 6 and the drive system.

[0028] As shown in FIG. 5, in this embodiment, preferably, a motor cavity for mounting the left drive motor 4 is installed in the left power rear fork housing 2, and a connection cavity for connecting the rear fork holder 1 is provided above the motor cavity. A cable cavity is further installed between the connection cavity and the motor cavity, which is a transition section between the connection cavity and the motor cavity, and the cable connecting the motor passes through the cable cavity.

[0029] As shown in Figures 1 to 5, the left drive motor 4 is the main drive unit, and the right drive motor 5 is the auxiliary drive unit, i.e., the left drive motor 4 bears all of the power output, and as long as the vehicle needs to run, the left drive motor 4 is always started, and the right drive motor 5 can be started as needed to provide auxiliary drive to the drive wheels 6.

[0030] When the left drive motor 4 is started, it rotates the left gear shaft and the left driven gear 9, which in turn rotates the output shaft 7 and the drive wheels 6, thereby driving the vehicle.

[0031] When the right drive motor 5 does not participate in driving, the left drive motor 4 alone drives the vehicle. In this case, the output shaft 7 of the drive wheel 6 rotates the female spline sleeve 13. However, because the one-way clutch 12 is in the automatic disconnection state at this time, the right driven gear 11 on the female spline sleeve 13 does not rotate but remains stationary. This prevents the right drive motor 5 from spinning freely due to the power output from the left drive motor 4, which is a waste of power, and also reduces wear on the moving parts inside the right power rear fork housing 3. When the right drive motor 5 participates in driving, it drives the right driving gear shaft 10 and the right driven gear 11. In this case, the one-way clutch 12 is in a locked state, and the right driven gear 11 can rotate the female spline sleeve 13, that is, the power can be retransmitted to the output shaft 7 and linked with the left drive motor 4.

[0032] In this embodiment, preferably, both the left and right sides can be designed as the main drive structure, and the left and right drive motors can drive the vehicle at any time, and the gear transmission between the motor and the output shaft 7 can be changed to a two-stage reduction, or the left and right gear transmissions can be set to different speed ratios.

[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 Left power rear fork housing 3 Right power rear fork housing 4 Left drive motor 5 Right drive motor 6 drive wheels 7 Output shaft 8 Left drive gear shaft 9 Left driven gear 10 Right drive gear shaft 11 Right driven gear 12 One-way clutch 13 Female spline sleeve 14 Lock nut 15 Needle roller bearing 16 spacers.

Claims

1. A wheel-side dual motor drive system for a motorcycle, comprising: a rear fork holder connected to a frame; a left power rear fork housing and a right power rear fork housing installed on either side of the rear fork holder; a left drive motor installed in the left power rear fork housing; and a right drive motor installed in the right power rear fork housing; the left drive motor and the right drive motor both connected to an output shaft of a drive wheel, and one-way transmission between the right drive motor and the output shaft.

2. 2. The wheel-side dual-motor drive system of claim 1, wherein a left transmission mechanism is installed between the left driving motor and the driving wheel, the left transmission mechanism including a left driving gear shaft and a left driven gear, the left driving gear shaft being connected to the left driving motor, the left driven gear being connected to the output shaft, and the left driving gear shaft being meshed with the left driven gear.

3. 2. The wheel-side dual-motor drive system of claim 1, wherein a right transmission mechanism is installed between the right driving motor and the driving wheel, the right transmission mechanism including a right driving gear shaft, a right driven gear and a one-way clutch, the right driving gear shaft is connected to the right driving motor, the right driven gear is connected to the one-way clutch, the right driving gear shaft is meshed with the right driven gear, and the one-way clutch is connected to the output shaft.

4. 4. The motorcycle wheel-side dual-motor drive system according to claim 3, wherein a female spline sleeve is installed on a rotating portion of the output shaft located inside the right power rear fork housing, a corresponding male spline is installed on the rotating portion of the output shaft, the right driven gear is connected to the female spline sleeve, and the one-way clutch is located between the right driven gear and the female spline sleeve.

5. 5. The motorcycle wheel side dual motor drive system according to claim 4, wherein a lock nut is threadedly engaged with an end of a rotating portion of the output shaft located inside a right power rear fork housing, and the lock nut is in contact with a female spline sleeve.

6. 6. The wheel-side dual motor drive system for motorcycles as claimed in claim 5, wherein a needle roller bearing is installed between the right driven gear and the output shaft.

7. 7. The motorcycle wheel-side dual motor drive system according to claim 6, wherein a spacer is installed between the output shaft and the wheel, and one end of the spacer is in contact with the female spline sleeve.

8. 2. The motorcycle wheel-side dual-motor drive system according to claim 1, wherein the left and right power rear fork housings are connected to the rear fork holders via bolts and nuts.

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