A reduction gear set, a single-speed electric drive assembly, and a vehicle

Abstract

This utility model discloses a reduction gear set, a single-speed electric drive assembly, and a vehicle. The reduction gear set includes a central gear, a power output shaft, an internal gear ring, a power input shaft, a transition shaft, and multiple planetary gears. The power output shaft coaxially passes through the middle of the internal gear ring, which is coaxially and fixedly connected to the power output shaft via a connector. The central gear is coaxially and rotatably mounted on the power output shaft and located within the internal gear ring, with an annular gap between the internal gear ring and the central gear. Multiple planetary gears are circumferentially spaced within the annular gap, and each planetary gear meshes with both the internal gear ring and the central gear. The power input shaft is coaxially and fixedly connected to any one of the planetary gears. Each of the remaining planetary gears is matched with a transition shaft and rotatably connected to the corresponding transition shaft. This allows the power input from the power input shaft to be transmitted to the internal gear ring via multiple planetary gears, preventing bending deformation of the power input shaft due to large input torque.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle technology, and in particular relates to a reduction gear set, a single-speed electric drive assembly, and a vehicle. Background Technology

[0002] Currently, there are various structures for reduction gear sets. For single-stage reduction gears, power is transmitted from the small gear to the large gear to achieve speed reduction. However, during the power transmission process, especially when the power torque is large, the shaft corresponding to either the large gear or the small gear may be bent due to large torsional stress. Currently, the solution to this problem is usually to increase the diameter of the shaft, but this will make the equipment bulky and increase costs. Utility Model Content

[0003] To solve the above-mentioned technical problems, one of the objectives of this utility model is to provide a reduction gear set with a compact structure that can achieve large torsional transmission.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A reduction gear set includes a central gear, a power output shaft, an internal gear ring, a power input shaft, a transition shaft, and multiple planetary gears. The power output shaft coaxially passes through the middle of the internal gear ring. The internal gear ring is coaxially and fixedly connected to the power output shaft via a connector. The central gear is coaxially and rotatably mounted on the power output shaft and located within the internal gear ring. An annular gap exists between the internal gear ring and the central gear. Multiple planetary gears are circumferentially spaced within the annular gap, and each planetary gear meshes with both the internal gear ring and the central gear. The power input shaft is coaxially and fixedly connected to any one of the planetary gears. The remaining planetary gears are each matched with a transition shaft and are coaxially and rotatably connected to the corresponding transition shaft.

[0005] The beneficial effects of the above-mentioned technical solution of this utility model are as follows: Since the planetary gear is located inside the ring of the internal gear ring, the diameter of the planetary gear is smaller than the inner diameter of the internal gear ring. Therefore, the power is transmitted from the power input shaft to the power output shaft by a reduction drive. In addition, the central gear can also provide support for the power input shaft to avoid bending deformation when the torque input to the power input shaft is large. At the same time, part of the power input from the power input shaft is directly transmitted to the internal gear ring, and another part of the power is transmitted to the internal gear ring through the central gear and other planetary gears. This can further prevent the power input shaft from bending deformation due to the large input torque.

[0006] Based on the above technical solution, the present invention can be further improved as follows: Furthermore, the planetary gears are provided in 2-4 configurations.

[0007] The beneficial effect of the above-mentioned further technical solution is that it makes the structure of the entire reduction gear set more compact.

[0008] Furthermore, the plurality of planetary gears are evenly distributed circumferentially within the annular gap.

[0009] The beneficial effect of the above-mentioned further technical solution is that it allows the internal gear ring to receive power input from multiple evenly spaced points in the circumferential direction, thus avoiding uneven force distribution on the internal gear ring and the connecting parts in the axial direction.

[0010] Furthermore, the connector is an annular plate, the power output shaft passes through the inner hole of the connector and is coaxially fixedly connected to or integrally formed with the connector, and one side of the internal gear ring is coaxially fixedly connected to or integrally formed with the outer edge of the connector.

[0011] The advantages of the above-mentioned further technical solution are: its structure is simple and it makes the connection strength between the internal gear ring and the power output shaft higher.

[0012] Furthermore, the diameters of both the transition shaft and the power input shaft are smaller than the diameter of the power output shaft.

[0013] The beneficial effect of the above-mentioned further technical solution is that the input power is distributed and transmitted through multiple planetary gears, which reduces the diameter requirement of the power input shaft and also makes it possible to increase the reduction ratio between the planetary gears and the internal gear ring.

[0014] The second objective of this invention is to provide a single-speed electric drive assembly with a compact structure that can withstand a large torque transmission.

[0015] To achieve the above objectives, another technical solution of this utility model is as follows: a single-speed electric drive assembly, including a drive motor, an axle, and a reduction gear set as described above, wherein the drive end of the drive motor is connected to the power input shaft, the axle has a differential, and the power output shaft is connected to the differential.

[0016] The beneficial effect of the above-mentioned technical solution of this utility model is that the power output by the drive motor is transmitted to the differential by the reduction gear set, and finally to the two wheel axles of the axle.

[0017] Based on the above technical solution, the present invention can be further improved as follows: Furthermore, the drive end of the drive motor is coaxially distributed with or integrally formed with the power input shaft.

[0018] The beneficial effect of the above-mentioned further technical solution is that it enables direct drive transmission between the drive motor and the power input shaft, thus making the structure of the entire single-speed electric drive assembly more compact.

[0019] Furthermore, a power output gear is coaxially fixed on the power output shaft, and a power input gear is coaxially fixed on the differential housing, with the power output gear and the power input gear meshing with each other.

[0020] The beneficial effect of the above-mentioned further technical solution is that it allows the power output shaft to be arranged in parallel with the axle, and the stability of power transmission between the two is better.

[0021] Furthermore, the outer diameter of the power output gear is smaller than the outer diameter of the power input gear.

[0022] The beneficial effect of the above-mentioned further technical solution is that it enables the power output shaft and the differential to perform a speed reduction transmission again, thereby increasing the output torque.

[0023] The third objective of this utility model is to provide a vehicle with a simple power system.

[0024] To achieve the above objectives, another technical solution of this utility model is as follows: a vehicle, including the single-speed electric drive assembly as described above.

[0025] The beneficial effects of the above-mentioned technical solution of this utility model are as follows: the power system of the vehicle has a simple structure and reasonable layout, and the power transmission effect is good. Attached Figure Description

[0026] Figure 1 This is a front view of the reduction gear set described in Embodiment 1 of this utility model when it has two planetary gears; Figure 2 This is a side view of the reduction gear set described in Embodiment 1 of this utility model; Figure 3 This is a front view of the reduction gear set described in Embodiment 1 of this utility model when it has three planetary gears; Figure 4 This is a front view of the connector and internal gear ring described in Embodiment 1 of this utility model; Figure 5 This is a side view of the single-speed electric drive assembly described in Embodiment 2 of this utility model.

[0027] In the diagram: 1. Reduction gear set; 11. Center gear; 12. Power output shaft; 13. Internal gear ring; 14. Power input shaft; 15. Transition shaft; 16. Planetary gear; 17. Connecting part; 171. Weight reduction hole; 18. Power output gear; 2. Drive motor; 3. Axle; 31. Differential; 311. Power input gear; 32. Wheel axle. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0031] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0032] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0033] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a reduction gear set 1, including a central gear 11, a power output shaft 12, an internal gear ring 13, a power input shaft 14, a transition shaft 15, and a plurality of planetary gears 16. The power output shaft 12 coaxially passes through the middle of the internal gear ring 13. The internal gear ring 13 is coaxially and fixedly connected to the power output shaft 12 via a connector 17. The central gear 11 is coaxially and rotatably mounted on the power output shaft 12 and located inside the internal gear ring 13, with an annular gap between the internal gear ring 13 and the central gear 11. The plurality of planetary gears 16 are circumferentially spaced within the annular gap, and each planetary gear 16 meshes with both the internal gear ring 13 and the central gear 11. The power input shaft 14 is coaxially and fixedly connected to any one of the planetary gears 16. The remaining planetary gears 16 are each matched with one of the transition shafts 15 and are coaxially and rotatably connected to the corresponding transition shaft 15. Since the planetary gear 16 is located inside the ring of the internal gear ring 13, the diameter of the planetary gear 16 is smaller than the inner diameter of the internal gear ring 13. Therefore, the power is transmitted from the power input shaft 14 to the power output shaft 12 by a reduction drive. In addition, the central gear 11 can also support the power input shaft 14 to prevent bending deformation when the torque input to the power input shaft 14 is large. At the same time, part of the power input to the power input shaft 14 is directly transmitted to the internal gear ring 13, while another part of the power is transmitted to the internal gear ring 13 through the central gear 11 and other planetary gears 16. This can further prevent the power input shaft 14 from bending deformation due to the large input torque.

[0034] In this embodiment, the rotational speed and rotational direction of the multiple planetary gears 16 are the same.

[0035] like Figure 3 As shown, in this embodiment, there are 2-4 planetary gears 16 (preferably, in this embodiment, there can be 2, 3 or 4 planetary gears 16; preferably, there are 3 planetary gears 16, in which case there are two transition shafts 15). This makes the structure of the entire reduction gear set 1 more compact.

[0036] In this embodiment, the specifications of the multiple planetary gears 16 are the same (the outer diameter and number of teeth are the same), but the diameter of their inner holes may differ to meet the installation requirements of the transition shaft 15 and the power input shaft 14. Preferably, in this embodiment, the diameters of the transition shaft 15 and the power input shaft 14 are equivalent.

[0037] like Figure 3 As shown, in this embodiment, the plurality of planetary gears 16 are evenly distributed circumferentially within the annular gap. This allows the internal gear ring 13 to receive power input at multiple evenly spaced points in the circumferential direction, thus avoiding uneven distribution of axial forces on the internal gear ring 13 and the connecting member 17.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the connector 17 is an annular plate. The power output shaft 12 passes through the inner hole of the connector 17 and is coaxially fixedly connected to or integrally formed with the connector 17. One side of the internal gear ring 13 is coaxially fixedly connected to or integrally formed with the outer edge of the connector 17. Its structure is simple and provides higher connection strength between the internal gear ring 13 and the power output shaft 12.

[0039] like Figure 4 As shown, in this embodiment, the connector 17 can be integrally formed with the internal gear ring 13 into a circular groove, and the connector 17 can be interference-fitted onto the power output shaft 12 through its inner hole. In order to further achieve the weight reduction of the entire reduction gear set 1, weight reduction holes 171 can be evenly spaced around the connector 17.

[0040] like Figure 1 As shown, in this embodiment, the diameters of the transition shaft 15 and the power input shaft 14 are both smaller than the diameter of the power output shaft 12. The input power is distributed and transmitted through multiple planetary gears 16, which reduces the diameter requirement for the power input shaft 14 and also makes it possible to increase the reduction ratio between the planetary gears 16 and the internal gear ring 13.

[0041] In this embodiment, the transition shaft 15 can be fixedly or rotatably mounted on the carrier, while the power output shaft 12 and the power input shaft 14 are both rotatably mounted on the carrier.

[0042] Example 2 like Figure 5As shown, this embodiment provides a single-speed electric drive assembly, including a drive motor 2, an axle 3, and a reduction gear set 1 as described in Embodiment 1. The drive end of the drive motor 2 is connected to the power input shaft 14. The axle 3 has a differential 31, and the power output shaft 12 is connected to the differential 31. This allows the power output by the drive motor 2 to be transmitted through the reduction gear set 1 to the differential 31, and finally to the two axles 32 of the axle 3.

[0043] like Figure 5 As shown, in this embodiment, the drive end of the drive motor 2 is coaxially distributed with or integrally formed with the power input shaft 14. This enables direct drive transmission between the drive motor 2 and the power input shaft 14, making the entire single-speed electric drive assembly more compact.

[0044] Preferably, in this embodiment, the power output shaft 12 is located between the power input shaft 14 and the axle 3, which provides more space for the installation of the drive motor 2, and also provides more space between the power input shaft 14 and the axle for the installation of the transition shaft 15.

[0045] like Figure 5 As shown, in this embodiment, a power output gear 18 is coaxially fixed on the power output shaft 12, and a power input gear 311 is coaxially fixed on the housing of the differential 31. The power output gear 18 and the power input gear 311 mesh with each other. This allows the power output shaft 12 and the axle 3 to be arranged in parallel, and the stability of power transmission between them is better.

[0046] like Figure 5 As shown, in this embodiment, the outer diameter of the power output gear 18 is smaller than the outer diameter of the power input gear 311. This allows for another reduction transmission between the power output shaft 12 and the differential 31, thereby increasing the output torque.

[0047] In this embodiment, the axle 3 has two axles 32, which are distributed relative to each other and respectively inserted into the differential 31 (the connection method between the axle 32 and the differential 31 is prior art and will not be described in detail here).

[0048] In this embodiment, the housings of the wheel axle 32 and the differential 31 can be rotatably mounted on a carrier, which can be the chassis of a vehicle.

[0049] Example 3 This embodiment provides a vehicle including the single-speed electric drive assembly as described in Embodiment 2. The vehicle's power system has a simple structure and reasonable layout, while also exhibiting good power transmission performance. The vehicle described in this embodiment can be a new energy vehicle (either a new energy commercial vehicle or a passenger vehicle).

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reduction gear set, characterized in that, The system includes a central gear (11), a power output shaft (12), an internal gear ring (13), a power input shaft (14), a transition shaft (15), and multiple planetary gears (16). The power output shaft (12) coaxially passes through the middle of the internal gear ring (13). The internal gear ring (13) is coaxially and fixedly connected to the power output shaft (12) via a connector (17). The central gear (11) is coaxially and rotatably mounted on the power output shaft (12) and located inside the internal gear ring (13). There is an annular gap between the ring (13) and the central gear (11). Multiple planetary gears (16) are arranged circumferentially in the annular gap, and each planetary gear (16) meshes with the internal gear ring (13) and the central gear (11) respectively. The power input shaft (14) is coaxially fixedly connected to any one of the planetary gears (16). The remaining planetary gears (16) are each matched with a transition shaft (15) and are coaxially rotatably connected to the corresponding transition shaft (15).

2. The reduction gear set according to claim 1, characterized in that, The planetary gears (16) are provided in 2-4 units.

3. The reduction gear set according to claim 1, characterized in that, The planetary gears (16) are evenly distributed circumferentially within the annular gap.

4. The reduction gear set according to claim 1, characterized in that, The connector (17) is a circular plate. The power output shaft (12) passes through the inner hole of the connector (17) and is coaxially fixedly connected to or integrally formed with the connector (17). One side of the internal gear ring (13) is coaxially fixedly connected to or integrally formed with the outer edge of the connector (17).

5. The reduction gear set according to any one of claims 1-4, characterized in that, The diameters of the transition shaft (15) and the power input shaft (14) are both smaller than the diameter of the power output shaft (12).

6. A single-speed electric drive assembly, characterized in that, The vehicle includes a drive motor (2), an axle (3), and a reduction gear set (1) as described in any one of claims 1-5. The drive end of the drive motor (2) is connected to the power input shaft (14) in a transmission connection. The axle (3) has a differential (31), and the power output shaft (12) is connected to the differential (31) in a transmission connection.

7. The single-speed electric drive assembly according to claim 6, characterized in that, The drive end of the drive motor (2) is coaxially distributed with or integrally formed with the power input shaft (14).

8. The single-speed electric drive assembly according to claim 6, characterized in that, A power output gear (18) is coaxially fixed on the power output shaft (12), and a power input gear (311) is coaxially fixed on the housing of the differential (31). The power output gear (18) and the power input gear (311) mesh with each other.

9. The single-speed electric drive assembly according to claim 8, characterized in that, The outer diameter of the power output gear (18) is smaller than the outer diameter of the power input gear (311).

10. A vehicle, characterized in that, Includes the single-speed electric drive assembly as described in any one of claims 6-9.

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