Electric driving device, speed reducing mechanism for electric driving device and vehicle
By using a specific connection method for the double planetary gear set, the problem of achieving a high reduction ratio in existing reduction mechanisms is solved, enabling high torque transmission and structural flexibility, and improving the performance of the electric drive device.
Patent Information
- Application Number
- CN202423271224.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing reduction mechanisms are unable to achieve high reduction ratios and cannot effectively transmit large torques, thus limiting the performance of electric drive devices.
The reduction mechanism adopts a double planetary gear set, which connects the first and second planetary gear sets in a specific way to achieve a high reduction ratio and flexibly set the speed ratio of each set. This includes an anti-torsional connection between the motor rotor shaft and the first sun gear, an anti-torsional connection between the first ring gear and the second sun gear, a fixed second planetary carrier, and the first planetary carrier and the second ring gear connected to the differential as output.
It achieves a high reduction ratio, improves the torque transmission capability of the electric drive device, and provides flexibility in structural design to meet different needs.
Smart Images
Figure CN223644619U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to an electric drive device, a speed reduction mechanism for the electric drive device and a vehicle. BACKGROUND
[0002] New energy vehicles are usually driven by electric machines, that is, the power of the electric machine is transmitted to a differential, and then distributed to wheels to drive the vehicle to travel.
[0003] Since the rotational speed of the drive electric machine on the vehicle is high, a speed reduction mechanism is usually arranged between the drive electric machine and the differential to obtain a usable wheel speed.
[0004] A conventional speed reduction mechanism includes a gear pair or a single planetary gear set. The problem with the speed reduction mechanism composed of the gear pair or the single planetary gear set is that it cannot achieve a high reduction ratio, that is, it cannot transmit a large torque. SUMMARY
[0005] To solve the above problems of the prior art, on the one hand, the utility model provides an electric drive device, which comprises an electric machine, a speed reduction mechanism and a differential, the power of the electric machine is transmitted to the differential via the speed reduction mechanism, and the speed reduction mechanism comprises:
[0006] a first planetary gear set having a first sun gear, a first carrier and a first ring gear,
[0007] a second planetary gear set having a second sun gear, a second carrier and a second ring gear,
[0008] the first sun gear is torsionally connected to a rotor shaft of the electric machine as an input of the speed reduction mechanism,
[0009] the first ring gear is torsionally connected to the second sun gear,
[0010] the second carrier is fixed,
[0011] the first carrier and the second ring gear are drivingly connected to the differential as an output of the speed reduction mechanism.
[0012] The speed reduction mechanism of the electric drive device comprises two sets of planetary gear sets, and the components of the two sets of planetary gear sets are connected in a specific manner, thereby achieving the following technical effects:
[0013] 1. A high speed ratio can be formed;
[0014] 2. The speed ratio of the first planetary gear set and the speed ratio of the second planetary gear set of the speed reduction mechanism can be flexibly set individually for the same total high speed ratio. This gives the structural design of the electric drive device higher flexibility.
[0015] In a possible implementation, the electric drive device further comprises a housing, and the second carrier is fixed to the housing of the electric drive device.
[0016] In a possible implementation, the first carrier is torsionally connected with the second ring gear.
[0017] In a possible implementation, the first carrier and the second ring gear are respectively in driving connection with an input component of the differential.
[0018] In a possible implementation, the first sun gear is integrated with a rotor shaft of the electric machine or is connected with the rotor shaft through a spline.
[0019] In a possible implementation, the differential is a bevel gear differential, and the first carrier and the second ring gear are in driving connection with a housing of the bevel gear differential.
[0020] In a possible implementation, the electric machine, the first planetary gear set and the second planetary gear set are coaxially arranged in sequence in an axial direction, and a first carrier of the first planetary gear set is torsionally connected with a second sun gear of the second planetary gear set and a second ring gear of the second planetary gear set.
[0021] In a possible implementation, the electric machine, the second planetary gear set and the first planetary gear set are coaxially arranged in sequence in an axial direction, and a first carrier of the first planetary gear set is torsionally connected with a second ring gear of the second planetary gear set radially outside a first ring gear of the first planetary gear set.
[0022] In another aspect, the utility model is further related to a speed reduction mechanism for an electric drive device, and the speed reduction mechanism comprises:
[0023] a first planetary gear set having a first sun gear, a first carrier and a first ring gear,
[0024] a second planetary gear set having a second sun gear, a second carrier and a second ring gear,
[0025] the first sun gear as an input of the speed reduction mechanism,
[0026] the first ring gear being torsionally connected with the second sun gear,
[0027] the second carrier being fixed,
[0028] the first carrier and the second ring gear as an output of the speed reduction mechanism.
[0029] In a possible implementation, the speed reduction mechanism further comprises a housing, and the second carrier is fixed to the housing.
[0030] In a further aspect, the utility model still relates to a vehicle, the vehicle is equipped with the electric drive device according to the utility model.
[0031] It should be understood that the above general description and the following detailed description of the utility model are exemplary and illustrative, and are intended to provide further explanation of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0032] The accompanying drawings are included to provide a further understanding of the utility model, and they are incorporated and constitute a part of the application, and the drawings show the embodiments of the utility model, and together with the specification, they play the role of explaining the principles of the utility model. In the drawings:
[0033] Figure 1 An embodiment of the utility model is shown;
[0034] Figure 2 Another embodiment of the utility model is shown. DETAILED DESCRIPTION
[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0036] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, and is by no means any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0037] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that there is a feature, step, operation, device, component and / or its combination.
[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.
[0040] Figure 1 and Figure 2 An embodiment of the present invention is shown, comprising an electric drive device including a motor 1, a reduction mechanism 2, and a differential 3. Power from the motor 1 is transmitted to the differential 3 via the reduction mechanism 2. The motor 1 has a stator 11, a rotor 12, and a rotor shaft anti-torsively connected to the rotor 12 to output torque, as is known in the art and will not be described in detail here. The reduction mechanism 2 includes: a first planetary gear set GS1 having a first sun gear S1, a first planet carrier C1, and a first ring gear R1; and a second planetary gear set GS2 having a second sun gear S2, a second planet carrier C2, and a second ring gear R2.
[0041] In addition to the sun gear, planet carrier, and ring gear, a planetary gear set also includes planetary gears. The specific structure of a single planetary gear set is known in the art and will not be described in detail here.
[0042] exist Figure 1 In this embodiment, the first planetary gear set GS1 and the second planetary gear set GS2 of the motor 1 and the reduction mechanism 2 are arranged coaxially in sequence in the axial direction, that is, the first planetary gear set GS1 is arranged between the motor 1 and the second planetary gear set GS2.
[0043] The first sun gear S1 of the first planetary gear set GS1 is connected to the rotor shaft of the motor 1 in a torsion-resistant manner as the input of the reduction mechanism 2. For example, the first sun gear S1 of the first planetary gear set GS1 can be formed on the rotor shaft of the motor 1, that is, integrally formed with the rotor shaft of the motor 1. The first sun gear S1 of the first planetary gear set GS1 and the rotor shaft of the motor 1 can also be connected via a spline. The rotor shaft of the motor 1 can also be connected to the first sun gear S1 in a torsion-resistant manner via a rigid connecting member. As described above, the rotor shaft of the motor 1 is connected to the rotor 12 of the motor 1 in a torsion-resistant manner to transmit the torque of the motor 1 to the reduction mechanism 2.
[0044] The first ring gear R1 of the first planetary gear set GS1 is torsionally connected to the second sun gear S2 of the second planetary gear set GS2. For example, the first ring gear R1 and the second sun gear S2 can be formed as one piece, or connected by a rigid connecting member.
[0045] The second planetary carrier C2 of the second planetary gear set GS2 is fixed. The second planetary carrier C2 does not rotate during operation of the electric drive unit, i.e., it is fixed relative to the stator 11 of the motor 1. The electric drive unit may include a housing 4, in which the motor 1 and the reduction mechanism 2 are housed, and the stator 11 of the motor 1 is fixed to the housing 4. In this case, the second planetary carrier C2 of the second planetary gear set GS2 is fixed to the housing 4 of the electric drive unit. Alternatively, the motor 1 and the reduction mechanism 2 may each have their own housing. In this case, the second planetary carrier C2 of the second planetary gear set GS2 is fixed to the housing of the reduction mechanism. The method of fixing the second planetary carrier C2 is not limited to these, as long as the second planetary carrier C2 is fixed relative to the stator 11 of the motor 1.
[0046] The first planetary carrier C1 of the first planetary gear set GS1 and the second ring gear R2 of the second planetary gear set GS2 are connected to the differential 3 as the output of the reduction mechanism 2. For example, the first planetary carrier C1 and the second ring gear R2 can be connected to each other first, and then connected to the differential 3. Alternatively, the first planetary carrier C1 can not be directly connected to the second ring gear R2, but the first planetary carrier C1 is connected to the differential 3, and the second ring gear R2 is also connected to the differential 3.
[0047] The first planet carrier C1 of the first planetary gear set GS1 is torsionally connected to the second ring gear R2 of the second planetary gear set GS2. This is achieved through a rigid connection between the first planet carrier C1 and the second ring gear R2, and the first planet carrier C1 and the second ring gear R2 rotate synchronously.
[0048] Alternatively, the first planetary carrier C1 and the second ring gear R2 can be connected to the input component of the differential 3 for transmission. In this case, synchronous rotation of the first planetary carrier C1 and the second ring gear R2 can also be achieved.
[0049] existFigure 1 In this embodiment, the first planet carrier C1 of the first planetary gear set GS1 passes through the second sun gear S2 of the second planetary gear set GS2 and is torsionally connected to the second ring gear R2. The first planet carrier C1 and the second sun gear S2, as the output of the reduction mechanism, transmit power to the differential. The torsionally connected first planet carrier C1 of the first planetary gear set GS1 through the second sun gear S2 of the second planetary gear set GS2 means that the power transmission path between the first planet carrier C1 and the second ring gear R2 passes through the second sun gear S2. In the case where the first planet carrier C1 and the second ring gear R2 are torsionally connected by a connector, the connector may pass through the second sun gear S2.
[0050] exist Figure 1 In this embodiment, the differential 3 is a bevel gear differential, and the first planet carrier C1 of the first planetary gear set GS1 and the second ring gear R2 of the second planetary gear set GS2 are connected to the housing of the bevel gear differential (which serves as the input component of the differential) as the output of the reduction mechanism 2. However, the type of differential 3 is not limited to a bevel gear differential; it can be other types of differentials, and the first planet carrier C1 and the second ring gear R2 are connected to the input component of the differential.
[0051] The reduction mechanism 2 of the aforementioned electric drive device includes two sets of planetary gear sets. The components of these two sets of planetary gear sets are connected in a specific manner to achieve the following technical effects:
[0052] 1. It can achieve a relatively high speed ratio;
[0053] 2. The speed ratios of the first and second planetary gear sets of the reduction mechanism can be flexibly set separately for the same overall high-speed ratio. This gives the electric drive unit greater flexibility in structural design.
[0054] exist Figure 2 In this embodiment, the second planetary gear set GS2 and the first planetary gear set GS1 of the motor 1 and the reduction mechanism 2 are arranged coaxially in sequence in the axial direction, that is, the second planetary gear set GS2 is arranged between the motor and the first planetary gear set GS1.
[0055] exist Figure 2 In the embodiment, the connection relationship of each component of the first planetary gear set GS1 and the second planetary gear set GS2 is as follows: Figure 1 The embodiments are the same and will not be described again here.
[0056] It should be pointed out that, in Figure 2In this embodiment, since the motor 1 is separated from the first planetary gear set GS1 by a second planetary gear set GS2, the rotor shaft of the motor 1 passes through the second sun gear S2 of the second planetary gear set GS2. The second sun gear S2 of the rotor shaft of the motor 1 includes the following cases: the rotor shaft of the motor is connected to the first sun gear S1 of the first planetary gear set GS1 by a rigid connector, which passes through the second sun gear S2 of the second planetary gear set GS2.
[0057] In addition, with Figure 1 In a different embodiment, the first planet carrier C1 of the first planetary gear set GS1 and the second ring gear R2 of the second planetary gear set GS2 are connected radially to the outside of the first ring gear R1 in an anti-torsional connection.
[0058] This utility model also relates to a speed reduction mechanism, comprising: a first planetary gear set GS1 having a first sun gear S1, a first planet carrier C1, and a first ring gear R1; and a second planetary gear set GS2 having a second sun gear S2, a second planet carrier C2, and a second ring gear R2. The first sun gear S1 serves as the input of the speed reduction mechanism, the first ring gear R1 is anti-torsionally connected to the second sun gear S2, the second planet carrier C2 is fixed, and the first planet carrier C1 is anti-torsionally connected to the second ring gear R2 and serves as the output of the speed reduction mechanism.
[0059] The reduction gear may have a housing, to which the second planetary carrier C2 is fixed.
[0060] The first planet carrier C1 of the first planetary gear set GS1 can pass through the second sun gear S2 of the second planetary gear set GS2 and be torsionally connected to the second ring gear R2.
[0061] Alternatively, the first planet carrier C1 of the first planetary gear set GS1 can be torsionally connected to the second ring gear R2 of the second planetary gear set GS2 on the radially outer side of the first ring gear R1.
[0062] This utility model also relates to a vehicle equipped with an electric drive device according to this utility model.
[0063] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.
Claims
1. An electric drive device, comprising a motor (1), a reduction mechanism (2), and a differential (3), wherein the power of the motor (1) is transmitted to the differential (3) via the reduction mechanism (2), characterized in that, The deceleration mechanism (2) includes: The first planetary gear set (GS1) includes a first sun gear (S1), a first planet carrier (C1), and a first ring gear (R1). The second planetary gear set (GS2) includes a second sun gear (S2), a second planet carrier (C2), and a second ring gear (R2). The first sun gear (S1) serves as the input to the reduction mechanism and is torsionally connected to the rotor shaft of the motor. The first gear ring (R1) is anti-torsionally connected to the second sun gear (S2). The second planetary carrier (C2) is fixed. The first planetary carrier (C1) and the second ring gear (R2) are connected to the differential drive as the output of the reduction mechanism.
2. The electric drive device according to claim 1, characterized in that, The electric drive device also includes a housing (4), to which the second planetary carrier (C2) is fixed.
3. The electric drive device according to claim 1, characterized in that, The first planetary carrier (C1) is torsionally connected to the second gear ring (R2).
4. The electric drive device according to claim 3, characterized in that, The first planetary carrier (C1) and the second ring gear (R2) are respectively connected to the input component of the differential.
5. The electric drive device according to claim 1, characterized in that, The first sun gear (S1) is integral with the rotor shaft of the motor or connected by a spline.
6. The electric drive device according to claim 1, characterized in that, The differential (3) is a bevel gear differential, and the first planetary carrier (C1) and the second ring gear (R2) are connected to the housing of the bevel gear differential.
7. The electric drive device according to claim 3, characterized in that, The motor (1), the first planetary gear set (GS1) and the second planetary gear set (GS2) are arranged coaxially in sequence in the axial direction, and the first planet carrier (C1) of the first planetary gear set (GS1) passes through the second sun gear (S2) of the second planetary gear set (GS2) and is torsionally connected to the second ring gear (R2) of the second planetary gear set (GS2).
8. The electric drive device according to claim 3, characterized in that, The motor (1), the second planetary gear set (GS2) and the first planetary gear set (GS1) are arranged coaxially in sequence in the axial direction, and the first planet carrier (C1) of the first planetary gear set (GS1) and the second gear ring (R2) of the second planetary gear set (GS2) are connected radially and externally to the torsional connection of the first gear ring (R1) of the first planetary gear set (GS1).
9. A speed reduction mechanism for an electric drive device, characterized in that, The deceleration mechanism includes: The first planetary gear set (GS1) includes a first sun gear (S1), a first planet carrier (C1), and a first ring gear (R1). The second planetary gear set (GS2) includes a second sun gear (S2), a second planet carrier (C2), and a second ring gear (R2). The first sun gear (S1) serves as the input to the reduction mechanism. The first gear ring (R1) is anti-torsionally connected to the second sun gear (S2). The second planetary carrier (C2) is fixed. The first planetary carrier (C1) and the second gear ring (R2) serve as the output of the reduction mechanism.
10. The speed reduction mechanism according to claim 9, characterized in that, The deceleration mechanism (2) also includes a housing, to which the second planetary carrier (C2) is fixed.
11. A vehicle, characterized in that, The vehicle is equipped with an electric drive unit according to any one of claims 1-8.