Gear, speed reducer and vehicle

Abstract

The utility model provides a gear, a speed reducer and a vehicle, the gear comprises a rim, a hub and a spoke, one side of the spoke close to the rim is connected with the rim through a plurality of transition surfaces, the plurality of transition surfaces are uniformly distributed along the circumferential direction of the spoke, and the transition surfaces are provided with chamfer structures. According to the scheme, the chamfer structure is machined on the transition surface to remove material accumulation at the outer edge of the spoke, so that the mass of the outer edge area of the spoke is uniformly distributed, the geometric dimension and geometric shape of the outer edge of the spoke are more regular, the geometric accuracy of the outer edge area of the spoke is improved, and then the dynamic balance performance of the gear is improved; and vibration and noise during rotation of the gear are reduced. Compared with the method for adjusting the mass distribution of the spoke by punching the spoke, the method for removing the material accumulation is the most direct and effective mode, and the repair and scrap probability is low.

Description

Technical Field

[0001] This utility model relates to the field of gear technology, and more specifically, to a gear, a reducer, and a vehicle. Background Technology

[0002] As the NVH requirements for new energy reducers become increasingly stringent, the requirements for gear meshing noise also increase. High-rigidity gear design helps reduce gear misalignment, which in turn helps reduce gear meshing noise.

[0003] Currently, curved spokes are used instead of flat spokes to improve gear rigidity. However, during the forging process, it is difficult to achieve perfect symmetry in the various parts of the web, making it difficult for the gear to meet dynamic balance standards. Weight-reduction holes are typically added to the web to adjust its structure. However, the effect of adjusting the web structure through this drilling method is limited, and there are cases where the dynamic balance standard is still not met even after weight reduction. Weight reduction through drilling not only requires additional rework and inspection but also increases the cost of scrapping and repairing the gear.

[0004] There is currently no effective solution to the problem that drilling holes in the web plate is not very effective in improving the dynamic balance performance of gear teeth. Utility Model Content

[0005] The main objective of this invention is to provide a gear, a reducer, and a vehicle to solve the problem of poor dynamic balance performance of gears in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, a gear is provided, including a rim, a hub, and spokes. The side of the spokes near the rim is connected to the rim via a transition surface. There are multiple transition surfaces, which are evenly distributed along the circumference of the spokes. The transition surfaces are provided with a chamfered structure.

[0007] Furthermore, the chamfered structure is continuously distributed along the circumference of the spokes.

[0008] Furthermore, the spokes are provided with multiple recesses and multiple bosses, which are distributed at intervals along the circumference of the spokes. The chamfering structure includes a first chamfering structure and a second chamfering structure, with the first chamfering structure positioned opposite to the recesses and the second chamfering structure positioned opposite to the bosses.

[0009] Furthermore, the parameter values ​​for the first chamfer structure and the second chamfer structure are the same.

[0010] Furthermore, in the axial direction of the spokes, the edges of the first chamfer structure and the second chamfer structure are flush.

[0011] Furthermore, the first end of the second chamfer structure extends to the edge of the rim, and the second end of the second chamfer structure extends in the radial direction of the gear.

[0012] Furthermore, a third chamfer structure is provided between the second end of the second chamfer structure and the boss.

[0013] Furthermore, the chamfered structure is treated with a rounded corner process.

[0014] According to another aspect of the present invention, a speed reducer is provided, including a gear, wherein the gear is the gear described above.

[0015] According to another aspect of the present invention, a vehicle is provided, the vehicle including a speed reducer, the speed reducer being the speed reducer described above.

[0016] By applying the technical solution of this utility model, the spokes connect to the rim via a transition surface. A chamfered structure is machined on the transition surface to remove material buildup at the outer edge of the spokes, resulting in a more uniform mass distribution in the outer edge region. Furthermore, the geometric dimensions and shapes at the outer edge of the spokes become more regular, improving the geometric accuracy of the outer edge region. This, in turn, enhances the dynamic balance performance of the gear and reduces vibration and noise during gear rotation. Uneven mass distribution and geometric accuracy of the spokes are the main factors affecting the dynamic balance performance of gears. Material buildup at the spoke edges is the primary cause of uneven mass distribution. Compared to drilling holes in the spokes to adjust the mass distribution, removing material buildup is the most direct and effective method, with a lower probability of rework and scrap. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the gear structure in this utility model is shown;

[0019] Figure 2 It shows Figure 1 A cross-sectional view along the AA direction.

[0020] The above figures include the following reference numerals:

[0021] 1. Spokes;

[0022] 11. Dents;

[0023] 12. Boss;

[0024] 13. First chamfer structure;

[0025] 14. Second chamfer structure;

[0026] 15. Third chamfer structure;

[0027] 2. Flange;

[0028] 3. Wheel hub. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0033] Combination Figures 1 to 2 As shown, according to a specific embodiment of this application, a gear is provided.

[0034] Specifically, the gear includes a rim 2, a hub 3, and spokes 1. The side of the spokes 1 closest to the rim 2 is connected to the rim 2 through a transition surface. There are multiple transition surfaces, which are evenly distributed along the circumference of the spokes 1. The transition surfaces are provided with a chamfered structure.

[0035] In the embodiments of this application, the spoke 1 connects to the rim 2 via a transition surface. A chamfer structure is machined on the transition surface to remove material buildup at the outer edge of the spoke 1, resulting in a more uniform mass distribution in the outer edge region of the spoke 1. This also makes the geometric dimensions and shape at the outer edge of the spoke 1 more regular, improving the geometric accuracy of the outer edge region of the spoke 1. This, in turn, improves the dynamic balance performance of the gear and reduces vibration and noise during gear rotation. Uneven mass distribution and geometric accuracy of the spoke 1 are the main factors affecting the dynamic balance performance of the gear. Material buildup at the edge of the spoke 1 is the main cause of uneven mass distribution. Compared to drilling holes in the spoke 1 to adjust its mass distribution, removing material buildup is the most direct and effective method, with a lower probability of rework and scrap.

[0036] It is understandable that the dynamic balance of a gear refers to the effect of the uniformity of its mass distribution on the axis of rotation during the rotation process. Poor dynamic balance will lead to unbalanced forces and torques during rotation, which in turn will cause vibration and noise, affecting the performance and life of the gear and the entire transmission system.

[0037] It should be noted that the spoke 1 is a crucial part of the gear structure, connecting the gear rim 2 and hub 3, and playing a vital role in the gear's rigidity, strength, and dynamic balance. During gear forging or casting, due to technological limitations, irregular or unintended material accumulation may occur at the edge of the spoke 1, resulting in uneven mass distribution. This unevenness directly affects the gear's dynamic balance, causing vibration and noise during rotation. Furthermore, unevenness or dimensional deviations at the edge of the spoke 1 can lead to additional unbalanced forces during gear rotation.

[0038] In one exemplary embodiment of this application, the chamfering structure is continuously distributed along the circumference of the spokes 1. That is, during the chamfering process, the edge area of ​​the spokes 1 is continuously processed to avoid geometric differences, quality differences, and stress concentrations at each processing section caused by tool retraction.

[0039] Specifically, the spoke 1 is provided with a plurality of recesses 11 and a plurality of protrusions 12, the recesses 11 and protrusions 12 are distributed at intervals along the circumference of the spoke 1, and the chamfer structure includes a first chamfer structure 13 and a second chamfer structure 14, the first chamfer structure 13 is arranged opposite to the recesses 11, and the second chamfer structure 14 is arranged opposite to the protrusions 12.

[0040] The recess 11 and boss 12 can adjust the mass distribution of the spoke 1, thereby improving the dynamic balance performance of the gear to a certain extent. The concave-convex structure formed by the recess 11 and boss 12 can improve the strength and stiffness of the spoke 1 without increasing its weight. For example, the boss 12 can increase the material thickness in local areas of the spoke 1, improving its bending strength, while the recess 11 can optimize the stress state and avoid stress concentration by changing the mass distribution of the spoke 1.

[0041] The first chamfer structure 13 and the second chamfer structure 14 have the same parameter values. That is, the geometry and machining depth of the first chamfer structure 13 and the second chamfer structure 14 are the same. The first chamfer structure 13 and the second chamfer structure 14 can be continuously machined using the same tool, which simplifies the process flow and reduces the manufacturing cost of gears.

[0042] Furthermore, in the axial direction of the spoke 1, the edges of the first chamfer structure 13 and the second chamfer structure 14 are flush. The flush arrangement of the edges of the two chamfer structures makes the geometry of the edge region of the spoke 1 more regular, which helps to improve the dynamic balance performance of the gear.

[0043] like Figure 2 As shown, the first end of the first chamfer structure 13 and the first end of the second chamfer structure 14 both extend to the edge of the wheel rim 2, and the second end of the first chamfer structure 13 and the second end of the second chamfer structure 14 are flush in the axial direction.

[0044] Furthermore, the first end of the second chamfer structure 14 extends to the edge of the rim 2, and the second end of the second chamfer structure 14 extends along the radial direction of the gear. That is, by extending the second end of the second chamfer structure 14, the geometry of the outer edge region of the spoke 1 becomes more regular, and the mass distribution becomes more uniform.

[0045] like Figure 2 As shown, the second chamfer structure 14 is disposed opposite to the boss 12. The second end of the second chamfer structure 14 extends along the radial direction of the gear, that is, the second end of the second chamfer structure 14 extends to the boss 12 to remove material from the surface of the boss 12 so that the material distribution of each boss 12 at this position is more uniform.

[0046] Furthermore, a third chamfer structure 15 is provided between the second end of the second chamfer structure 14 and the boss 12. That is, the third chamfer structure 15 removes the edge formed between the second chamfer structure 14 and the boss 12, thereby reducing the stress concentration of the spoke 1.

[0047] In one exemplary embodiment of this application, the chamfered structure is treated with a rounded corner process. By removing material through the rounded corner process, the two treated surfaces are joined by an arc, avoiding the formation of sharp edges and further reducing stress concentration on the spoke 1.

[0048] According to another specific embodiment of this application, a speed reducer is provided, including a gear, which is the gear in the above embodiment.

[0049] Specifically, the gear includes a rim 2, a hub 3, and spokes 1. The side of the spokes 1 closest to the rim 2 is connected to the rim 2 through a transition surface. There are multiple transition surfaces, which are evenly distributed along the circumference of the spokes 1. The transition surfaces are provided with a chamfered structure.

[0050] In the embodiments of this application, the spoke 1 is connected to the rim 2 via a transition surface, and a chamfer structure is processed on the transition surface to remove material accumulation at the outer edge of the spoke 1, so that the mass of the outer edge region of the spoke 1 is evenly distributed, and the geometric dimensions and geometric shape at the outer edge of the spoke 1 are more regular, thereby improving the geometric accuracy of the outer edge region of the spoke 1, thereby improving the dynamic balance performance of the gear, reducing vibration and noise when the gear rotates, and making the reducer run more smoothly.

[0051] According to another specific embodiment of this application, a vehicle is provided, the vehicle including a speed reducer, the speed reducer being the speed reducer in the above embodiment.

[0052] Specifically, the gear in the reducer includes a rim 2, a hub 3, and spokes 1. The side of the spokes 1 closest to the rim 2 is connected to the rim 2 through a transition surface. There are multiple transition surfaces, which are evenly distributed along the circumference of the spokes 1. The transition surfaces are provided with a chamfered structure.

[0053] In the embodiments of this application, the spoke 1 is connected to the rim 2 via a transition surface, and a chamfer structure is processed on the transition surface to remove material accumulation at the outer edge of the spoke 1, so that the mass of the outer edge region of the spoke 1 is evenly distributed, and the geometric dimensions and geometric shape of the outer edge of the spoke 1 are more regular, thereby improving the geometric accuracy of the outer edge region of the spoke 1, thereby improving the dynamic balance performance of the gear, reducing vibration and noise when the gear rotates, and making the operation of the reducer and the vehicle smoother.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gear, comprising a rim (2), a hub (3), and spokes (1), characterized in that, The side of the spoke (1) near the rim (2) is connected to the rim (2) through a transition surface. There are multiple transition surfaces, which are evenly distributed along the circumference of the spoke (1). The transition surfaces are provided with a chamfered structure.

2. The gear according to claim 1, characterized in that, The chamfered structure is continuously distributed along the circumference of the spokes (1).

3. The gear according to claim 2, characterized in that, The spokes (1) are provided with a plurality of recesses (11) and a plurality of protrusions (12). The recesses (11) and protrusions (12) are distributed at intervals along the circumference of the spokes (1). The chamfering structure includes a first chamfering structure (13) and a second chamfering structure (14). The first chamfering structure (13) is disposed opposite to the recesses (11), and the second chamfering structure (14) is disposed opposite to the protrusions (12).

4. The gear according to claim 3, characterized in that, The parameter values ​​of the first chamfer structure (13) and the second chamfer structure (14) are the same.

5. The gear according to claim 4, characterized in that, In the axial direction of the spokes (1), the edges of the first chamfer structure (13) and the second chamfer structure (14) are flush.

6. The gear according to claim 4, characterized in that, The first end of the second chamfer structure (14) extends to the edge of the rim (2), and the second end of the second chamfer structure (14) extends in the radial direction of the gear.

7. The gear according to claim 6, characterized in that, A third chamfer structure (15) is provided between the second end of the second chamfer structure (14) and the boss (12).

8. The gear according to any one of claims 1-7, characterized in that, The chamfered structure is processed using a rounded corner technique.

9. A speed reducer, comprising gears, characterized in that, The gear is the gear according to any one of claims 1-8.

10. A vehicle, the vehicle including a speed reducer, characterized in that, The speed reducer is the speed reducer described in claim 9.

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