Motorcycle drive assembly and motorcycle

Abstract

The application relates to the field of power, and discloses a motorcycle driving assembly and a motorcycle. The driving assembly comprises a shell, a motor and a speed reduction mechanism arranged in the shell. The motor comprises a rotor and a stator. A rotating shaft of the rotor is rotatably arranged in the shell through a first bearing. One end of the rotating shaft extends to form an input shaft of the speed reduction mechanism. A first gear is arranged on the input shaft. The speed reduction mechanism comprises a speed reduction shaft, on which a second gear is arranged. The number of teeth of the second gear is greater than that of the first gear. The two gears are in engagement and are both helical gears. The force F of the second gear acting on the first gear is divided into a force Fx in the axial direction of the input shaft. The inclination direction of the teeth on the first gear is such that the direction of Fx is towards the first bearing. By setting the inclination direction of the teeth on the first gear, the direction of Fx is towards the first bearing and acts on the first bearing, so that the possible axial movement of the rotating shaft is effectively prevented.

Description

Technical Field

[0001] This application belongs to the field of power, and specifically relates to a motorcycle drive assembly and a motorcycle. Background Technology

[0002] The core structure of new energy motorcycles (electric motorcycles) mainly includes battery packs, motors, reduction gears, controllers, frames, and auxiliary systems. Among these, the motor and reduction gears constitute the drive assembly, which is one of the core components of a motorcycle. Currently, bearings in existing motorcycle drive assemblies, especially those inside the motor, are prone to axial movement of the shaft. This can not only cause changes in the clearance between the motor rotor and stator, reducing magnetic coupling efficiency and affecting acceleration smoothness and range, but also lead to abnormal friction between the bearing and the bushing, shortening bearing life and even causing motor overheating. In extreme cases, bearing failure may lead to motor seizure or power interruption, threatening riding safety. Therefore, it is necessary to take measures to reduce the possibility of axial movement of the motor's internal shaft. Utility Model Content

[0003] The purpose of this application is to overcome the problem of axial movement of the bearings inside the motor in existing motorcycle drive assemblies, and to provide a motorcycle drive assembly and a motorcycle. The motorcycle drive assembly provided by this application effectively prevents axial movement of the shaft by applying a force to the motor in the same direction as the motor's unidirectional magnetic pull. This force acts on the motor's bearings.

[0004] To achieve the above objectives, the first aspect of this application provides a motorcycle drive assembly, wherein the drive assembly includes a housing, and a motor and a reduction mechanism are disposed within the housing, wherein the motor includes a rotor and a stator that cooperate with each other, the rotor shaft is rotatably mounted within the housing via a first bearing, one end of the rotor shaft extends to form an input shaft of the reduction mechanism, and a first gear is mounted on the input shaft; The deceleration mechanism includes a deceleration shaft on which a second gear is mounted. The number of teeth on the second gear is greater than the number of teeth on the first gear. The first gear and the second gear mesh, and both are helical gears. The force F exerted by the second gear on the first gear is a component of the force F in the axial direction of the input shaft, which is Fx. The inclination direction of the teeth on the first gear is such that the direction of Fx is toward the first bearing.

[0005] By adopting the above structure, the teeth on the first gear are tilted so that the force F acting on the first gear can be decomposed into a component force Fx parallel to the input shaft and a component force Fy perpendicular to the input shaft. Furthermore, by setting the teeth on the first gear to a specific tilt direction, the direction of Fx is towards the first bearing. This force is in the same direction as the magnetic pull force generated by the motor itself. The two act together on the first bearing, thereby effectively preventing the motor shaft from moving axially and improving the bearing life.

[0006] Preferably, the first gear is a right-hand helical gear. By setting the teeth on the first gear to a specific tilt direction, the direction of the scoring force Fx can be made to meet the requirements.

[0007] Preferably, the helix angle of the first gear is 15°-35°. When the inclination direction of the first gear's teeth is set within this range, the axial force generated by its rotation is superimposed on the motor's magnetic pull, increasing the preload of the motor's first bearing and reducing the risk of bearing ball slippage.

[0008] Preferably, the helix angle of the first gear is 20°-25°.

[0009] Preferably, the housing has a bearing chamber, the first bearing is mounted in the bearing chamber, and a wave spring is mounted on the rotating shaft between the first bearing and the inner end face of the bearing chamber. With this structure, the presence of the wave spring allows for a greater axial force to be provided with a smaller axial compression clearance.

[0010] Preferably, the wave spring is a stacked wave spring.

[0011] Preferably, a third gear is also mounted on the reduction shaft, and the reduction mechanism further includes an output shaft on which a fourth gear is mounted. The number of teeth on the third gear is less than the number of teeth on the second gear, and the number of teeth on the fourth gear is greater than the number of teeth on the second gear. The third gear and the fourth gear mesh. This structure achieves speed reduction through the meshing of multiple gears.

[0012] Preferably, the third gear is a helical gear, and the inclination direction of the teeth on the third gear is the same as the inclination direction of the teeth on the second gear.

[0013] Preferably, the first bearing is a double-row angular contact bearing. This structure can overcome the influence of the axial force of the axial flux motor and improve the service life of the bearing.

[0014] A second aspect of this application provides a motorcycle, wherein the motorcycle includes the drive assembly described in the first aspect of this application.

[0015] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the detailed description below to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the drive assembly of this application; Figure 2 This is a schematic diagram of the transmission relationship of the drive assembly; Figure 3 The force analysis diagram for the first gear is shown below. Figure 4 This is a schematic diagram of the motor structure.

[0018] Explanation of reference numerals in the attached figures 1-Outer casing; 2-Rotor; 3-Shaft; 4-First bearing; 5-Input shaft; 6-First gear; 7-Reduction shaft; 8-Second gear; 9-Wave spring; 10-Stator core; 10a-Winding section; 11-Coil winding; 12-Bracket; 13-Magnet; 14-Third gear; 15-Output shaft; 16-Fourth gear; 17-Second bearing; 18-Third bearing; 19-Fourth bearing; 20-Fifth bearing; 21-Stator. Detailed Implementation

[0019] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] The terms “first”, “second”, etc. are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. The objects distinguished by “first”, “second”, etc. are usually of the same class and the number of objects is not limited. For example, the first object can be one or more.

[0021] Furthermore, the term "and / or" in the specification and claims is used to describe the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0022] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0025] like Figure 1-4 As shown, in some embodiments, a motorcycle drive assembly is provided, wherein the drive assembly includes a housing 1, in which a motor and a reduction mechanism are disposed, the motor including a rotor 2 and a stator 21 that cooperate with each other, wherein the rotating shaft 3 of the rotor 2 is rotatably mounted in the housing 1 via a first bearing 4, one end of the rotating shaft 3 extends to form an input shaft 5 of the reduction mechanism, and a first gear 6 is mounted on the input shaft 5; The deceleration mechanism includes a deceleration shaft 7, with a third bearing 18 installed at each end of the deceleration shaft 7. Both third bearings 18 are fixedly installed inside the housing 1 to support the deceleration shaft 7. A second gear 8 is installed on the deceleration shaft 7 between the two third bearings 18. The number of teeth of the second gear 8 is greater than the number of teeth of the first gear 6. The first gear 6 and the second gear 8 mesh, and both are helical gears. The force F exerted by the second gear 8 on the first gear 6 is a force F. The axial component of this force F on the input shaft 5 is a force Fx. The inclination direction of the teeth on the first gear 6 is such that the direction of Fx is towards the first bearing 4.

[0026] Since the stator 21 and the rotor 2 are arranged parallel to each other in the axial direction, and the magnetic flux direction is parallel to the shaft 3, there is a unidirectional magnetic pull force f between the stator 21 and the rotor 2. The force F acting on the first gear 6 is in the direction of... Figure 3 As shown, the direction of its axial force component Fx on the rotating shaft 3 is the same as the direction of the unidirectional magnetic pull f. The two are superimposed, so that the rotating shaft 3 basically does not have axial reciprocating movement.

[0027] In some embodiments, the first gear 6 is a right-hand helical gear, and the helix angle of the first gear 6 is 15°-35°. For example, it can be 15°, 20°, 25°, 30°, 35°, etc.

[0028] In some embodiments, a second bearing 17 is mounted on the input shaft 5. This second bearing 17 is located on the side of the first gear 6 away from the first bearing 4. Both the first bearing 4 and the second bearing 17 are fixedly mounted within the housing 1 to support the rotating shaft 3 and the output shaft 5. This distributes the force acting on the first gear 6 between the first bearing 4 and the second bearing 17, reducing the force on a single bearing and thus improving bearing life. The first bearing 4 is a double-row angular contact bearing, and the helix angle of the first gear 6 is 20°-25°.

[0029] In some implementations, such as Figure 4 As shown, the stator 21 and rotor 2 are arranged opposite each other along the axial direction. Specifically, the stator 21 includes an annular stator core 10, which is fixedly installed inside the housing 1. The stator core 10 has a plurality of winding portions 10a evenly arranged along its circumference. The winding portions 10a are integrally formed with the stator core 10. The winding portions 10a and the stator core 10 are provided with an insulating layer. Each winding portion 10a is wound with a coil winding 11. The rotor 2's shaft 3 is rotatably inserted into the stator core 10. A bracket 12 is mounted on the shaft 3. Multiple magnets 13 are evenly arranged around the shaft 3 on the side of the bracket 12 facing the stator 21. The multiple magnets 13 are arranged one-to-one with each of the coil windings 11 along the axial direction.

[0030] The side of the magnet 13 facing the corresponding coil winding 11 is the south pole or the north pole, and the side of the magnet 13 away from the corresponding coil winding 11 along the axial direction is the north pole or the south pole (i.e., the north and south poles of a single magnet 13 are distributed along the axial direction). The south and north poles of all the sides of the magnet 13 facing the corresponding coil winding 11 are alternately distributed along the circumferential direction.

[0031] In some embodiments, the housing 1 has a bearing chamber, the first bearing 4 is installed in the bearing chamber, and a wave spring 9 is installed on the rotating shaft 3 between the first bearing 4 and the inner end face of the bearing chamber. The wave spring 9 is a stacked wave spring, and the outer ring of the first bearing 4 is in contact with the stacked wave spring.

[0032] In some embodiments, a third gear 14 is also mounted on the reduction shaft 7, which is close to the second gear 8. The reduction mechanism also includes an output shaft 15, which is mounted in the housing 1 via a fourth bearing 19 and a fifth bearing 20. A fourth gear 16 is mounted on the output shaft 15. The number of teeth of the third gear 14 is less than the number of teeth of the second gear 8, and the number of teeth of the fourth gear 16 is greater than the number of teeth of the second gear 8. The third gear 14 and the fourth gear 16 mesh.

[0033] The third gear 14 is a helical gear, and the inclination direction of the teeth on the third gear 14 is the same as the inclination direction of the teeth on the second gear 8.

[0034] In addition, to enhance heat dissipation, heat dissipation fins (not shown in the figure) are provided on the outer wall of the outer casing 1 near the motor.

[0035] In some embodiments, a motorcycle is provided, wherein the motorcycle includes the aforementioned drive assembly.

[0036] The contents not described in detail in this specification are existing technologies known to those skilled in the art, and will not be elaborated upon here.

[0037] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A motorcycle drive assembly, characterized in that, The drive assembly includes a housing, within which a motor and a reduction mechanism are disposed. The motor includes a rotor and a stator that cooperate with each other. The rotor shaft is rotatably mounted in the housing via a first bearing. One end of the rotor shaft extends to form the input shaft of the reduction mechanism, on which a first gear is mounted. The deceleration mechanism includes a deceleration shaft on which a second gear is mounted. The number of teeth on the second gear is greater than the number of teeth on the first gear. The first gear and the second gear mesh, and both are helical gears. The first bearing is a double-row angular contact bearing. The force F exerted by the second gear on the first gear is a force F. The axial component of this force F on the input shaft is a force Fx. The inclination direction of the teeth on the first gear is such that the direction of Fx is toward the first bearing. The first gear is a right-hand helical gear; The helix angle of the first gear is 15°-35°.

2. The drive assembly according to claim 1, characterized in that, The helix angle of the first gear is 20°-25°.

3. The drive assembly according to claim 1 or 2, characterized in that, The housing has a bearing chamber, the first bearing is installed in the bearing chamber, and a wave spring is installed on the rotating shaft between the first bearing and the inner end face of the bearing chamber.

4. The drive assembly according to claim 3, characterized in that, The wave spring is a stacked wave spring.

5. The drive assembly according to claim 1, characterized in that, A third gear is also installed on the reduction shaft. The reduction mechanism also includes an output shaft on which a fourth gear is installed. The number of teeth on the third gear is less than the number of teeth on the second gear, and the number of teeth on the fourth gear is greater than the number of teeth on the second gear. The third gear and the fourth gear mesh.

6. The drive assembly according to claim 5, characterized in that, The third gear is a helical gear, and the inclination direction of the teeth on the third gear is the same as the inclination direction of the teeth on the second gear.

7. A motorcycle, characterized in that, The motorcycle includes the drive assembly as described in any one of claims 1-6.

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