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 belongs to the technical field of motorcycle drive, and more specifically, relates to a wheel-side dual-motor drive system for a pure electric motorcycle.

Background Art

[0002] With the development and popularization of automotive electrification technology, electrification technology has gradually expanded to other fields such as ship electrification, construction machinery electrification, and industries such as pure electric motorcycles. So far, in the motorcycle industry, electric drive has mostly been applied to small-displacement vehicle models such as electric bicycles and scooters. In recent years, electric drive technology has gradually been applied to large motorcycles.

[0003] In the field of motorcycle electric drive, currently, forms such as hub motors and mid-mounted motors are common. When adopting the form of a hub motor, the structure is simple, but the weight of the hub motor is large, the efficiency is low, it not only affects the operating performance of the entire vehicle, but also increases the material cost, and the waterproof sealing performance is low. Also, the transmission route of the mid-mounted motor is long and it occupies a limited battery space, so the cruising range of the entire vehicle is shortened.

Summary of the Invention

[0004] In response to the deficiencies of the prior art, the present invention provides a wheel-side dual-motor drive system for a motorcycle, which realizes an innovation in the drive mode of a two-wheeled vehicle by dividing a mid-mounted motor or a hub motor of a normal design into two small wheel-side motors, and has significant advantages.

[0005] To achieve the above objective, the present invention provides a dual motor drive system for the wheels of a motorcycle, comprising a rear fork holder connected to a frame, wherein a left power rear fork housing and a right power rear fork housing are installed on both sides of the rear fork holder, a left drive motor is installed in the left power rear fork housing, a right drive motor is installed in the right power rear fork housing, both the left drive motor and the right drive motor are transmitted to the output shaft of the drive wheel, and the transmission between the right drive motor and the output shaft is unidirectional. Furthermore, a right-side transmission mechanism is installed between the right-side drive motor and the drive wheel, and the right-side transmission mechanism includes a right-side drive gear shaft, a right-side driven gear, and a one-way clutch, the right-side drive gear shaft is connected to the right-side drive motor, the right-side driven gear is connected to the one-way clutch, the right-side drive gear shaft meshes with the right-side driven gear, and the one-way clutch is connected to the output shaft. This invention provides a technical solution for a dual motor drive system on the wheel side of a motorcycle.

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

[0008] Furthermore, a female spline sleeve is installed on the rotating portion of the output shaft located within 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 screwed onto the end of the rotating portion of the output shaft located inside the right power rear fork housing, and the lock nut is in contact with a 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 a female spline sleeve.

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

[0013] Compared to conventional technology, the present invention offers the following advantages: The left drive motor is the main drive unit, and the right drive motor is the auxiliary drive unit; that is, the left drive motor is responsible for the entire power output, and as long as the vehicle needs to move, the left drive motor is always activated, and the right drive motor is activated as needed to provide auxiliary drive to the drive wheels. By dividing the conventional mid-mount motor or hub motor into two smaller wheel-side motors, the overall weight distribution of the vehicle becomes more rational, operating performance is improved, the space occupied by the motors is reduced, allowing for the placement of larger batteries and increasing the driving range. Performance degradation and waterproofing problems caused by increased rotational inertia due to the hub motor are mitigated, and independent drive and control of the left and right sides allows the entire vehicle to operate in a more energy-efficient state. The integrated design makes the overall appearance of the vehicle more harmonious and aesthetically pleasing. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of the three-dimensional structure of the dual motor drive system on the wheel side of the motorcycle according to the present invention. [Figure 2] This is a front cross-sectional view of the dual motor drive system on the wheel side of a motorcycle according to the present invention. [Figure 3] This is an enlarged view of section A in Figure 2. [Figure 4] This is a side cross-sectional view of the dual motor drive system on the wheel side of a motorcycle according to the present invention. [Figure 5] This is a schematic diagram of the structure of the left power rear fork housing of the dual motor drive system on the wheel side of the motorcycle according to the present invention. [Modes for carrying out the invention]

[0015] In the description of the present invention, the directions and positional relationships indicated by directional words such as "center," "horizontal (X)," "vertical (Y)," "vertical (Z)," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," and "counterclockwise" are based on the directions or positional relationships shown in the drawings and are merely for the purpose of making the present invention easier to explain and simplifying the explanation. They do not indicate or imply that the indicated device or element necessarily has a specific direction or is configured and operates in a specific direction, and should not be understood as limiting the specific scope of protection of the present invention.

[0016] Furthermore, terms such as “first,” “second,” etc., are used solely to describe the purpose and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, features to which “first,” “second,” etc., are limited may explicitly or implicitly include one or more such features, and in the description of the present invention, unless particularly clearly and specifically limited, “multiple,” “several” means two or more.

[0017] The present invention will be further described with reference to Figures 1 to 5.

[0018] A dual motor drive system for the wheels of a motorcycle, comprising a rear fork holder 1 connected to the frame, with a left power rear fork housing 2 and a right power rear fork housing 3 installed on both sides 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 transmitted to the output shaft 7 of the drive wheel 6, and the transmission between the right drive motor 5 and the output shaft 7 is unidirectional.

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

[0020] As shown in Figure 2, in this embodiment, preferably, a right-side transmission mechanism is installed between the right-side drive motor 5 and the drive wheel 6. The right-side transmission mechanism includes a right-side drive gear shaft 10, a right-side driven gear 11, and a one-way clutch 12. The right-side drive gear shaft 10 is connected to the right-side drive motor 5, the right-side driven gear 11 is connected to the one-way clutch 12, the right-side drive gear shaft 10 meshes with the right-side 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 drive gear shaft 8 and the left driven gear 9, and the meshing between the right drive 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 within 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 drive gear shaft 8 and the left power rear fork housing 2, a bearing is installed between the portion 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 drive 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 that are transmitted by the gears inside the power rear fork housing.

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

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

[0026]

[0027] As shown in FIG. 2, in this embodiment, preferably, both the left power rear fork housing 2 and the right power rear fork housing 3 are connected to the rear fork holder 1 via bolts and nuts to facilitate the installation and removal 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. There is a connection cavity for connecting the rear fork holder 1 above the motor cavity, and a cable cavity is further installed between the connection cavity and the motor cavity. It is the transition part 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. In other words, the left drive motor 4 is responsible for the entire power output, and as long as the vehicle needs to move, the left drive motor 4 will always start, and the right drive motor 5 will start 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 wheel 6, thereby driving the vehicle.

[0031] If the right drive motor 5 does not participate in the drive, the left drive motor 4 drives the vehicle's movement independently. In this case, the output shaft 7 of the drive wheel 6 rotates the female spline sleeve 13. However, since the one-way clutch 12 is in an automatically disengaged state, the right driven gear 11 on the female spline sleeve 13 remains stationary without rotating. This prevents the right drive motor 5 from spinning freely due to the power output from the left drive motor 4, thus avoiding wasted power, and also reduces wear on the movable members within the right power rear fork housing 3. When the right drive motor 5 joins the drive, it drives the right main gear shaft 10 and the right driven gear 11. In this case, the one-way clutch 12 is locked, and the right driven gear 11 can rotate the female spline sleeve 13, that is, the power is retransmitted to the output shaft 7 and can be linked with the left drive motor 4.

[0032] In this embodiment, preferably, both the left and right sides may 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 may be changed to a two-stage reduction, or the left and right gear transmissions may be set to different speed ratios.

[0033] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions belonging to the spirit of the present invention are within the scope of protection of the present invention. Those skilled in the art should note that several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should be considered within the scope of protection 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 passive gear 10 Right drive gear shaft 11 Right driven gear 12 One-way clutch 13 Female spline sleeve 14 lock nuts 15 Needle roller bearings 16 spacers.

Claims

1. A dual-motor drive system for the wheels of a motorcycle, comprising a rear fork holder connected to the frame, wherein a left power rear fork housing and a right power rear fork housing are installed on both sides of the rear fork holder, a left drive motor is installed in the left power rear fork housing, a right drive motor is installed in the right power rear fork housing, both the left and right drive motors are transmitted to the output shaft of the drive wheel, and the transmission between the right drive motor and the output shaft is unidirectional. A dual-motor drive system for the wheels of a motorcycle, characterized in that a right-side transmission mechanism is installed between the right-side drive motor and the drive wheel, the right-side transmission mechanism includes a right-side drive gear shaft, a right-side driven gear and a one-way clutch, the right-side drive gear shaft is connected to the right-side drive motor, the right-side driven gear is connected to the one-way clutch, the right-side drive gear shaft meshes with the right-side driven gear, and the one-way clutch is connected to the output shaft.

2. A dual motor drive system for the wheel side of a motorcycle according to claim 1, characterized in that a left transmission mechanism is installed between the left drive motor and the drive wheel, the left transmission mechanism includes a left drive gear shaft and a left driven gear, the left drive gear shaft is connected to the left drive motor, the left driven gear is connected to the output shaft, and the left drive gear shaft meshes with the left driven gear.

3. A dual motor drive system for the wheel side of a motorcycle according to claim 1, characterized in that a female spline sleeve is installed on the rotating part of the output shaft located within the right power rear fork housing, a corresponding male spline is installed on the rotating part 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.

4. The dual motor drive system for the wheel side of a motorcycle according to claim 3, characterized in that a lock nut is screwed onto the end of the rotating portion located within the right power rear fork housing of the output shaft, and the lock nut is in contact with a female spline sleeve.

5. The wheel-side dual motor drive system for a motorcycle according to claim 4, characterized in that a needle roller bearing is installed between the right driven gear and the output shaft.

6. The wheel-side dual motor drive system for a motorcycle according to claim 5, characterized in that a spacer is installed between the output shaft and the wheel, and one end of the spacer is in contact with a female spline sleeve.

7. The wheel-side dual motor drive system for a motorcycle according to claim 1, characterized in that both the left power rear fork housing and the right power rear fork housing are connected to the rear fork holder via bolts and nuts.

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