Electric drive assembly and vehicle

Abstract

The application discloses an electric drive assembly and a car. In the electric drive assembly, a hollow motor shaft is arranged on a driving motor, so that a driving quasi-double curved gear can transmit power through the inside of the hollow motor shaft, and the axis of the driving quasi-double curved gear is consistent with the axis of the hollow motor shaft. The driving motor and a speed reducer are integrated in the electric drive assembly by arranging the driving quasi-double curved gear in the hollow motor shaft. First and second bearings are arranged on the first and second ends of the gear shaft of the driving quasi-double curved gear, so that the first and second bearings can support the rotation of the driving quasi-double curved gear. The second bearing is arranged in the inside of the hollow motor shaft, so that the axial dimension of the electric drive assembly is shortened, the overall size of the electric drive assembly is reduced, and the overall volume of the electric drive assembly in the car is reduced.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to an electric drive assembly and an automobile. Background Technology

[0002] Currently, in order to make the vehicle as compact as possible, the motor and reducer are usually integrated into one electric drive assembly, which transmits power through a hypoid gear. Tapered roller bearings are required at both ends of the gear shaft of the hypoid gear to bear the axial and radial loads of the gear. However, the installation of tapered roller bearings increases the axial dimension of the electric drive assembly along the gear shaft of the hypoid gear, thus increasing the overall interior space occupied by the electric drive assembly.

[0003] In summary, how to reduce the size of the electric drive assembly is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an electric drive assembly and a vehicle that reduces the size of the electric drive assembly.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An electric drive assembly includes: a drive motor with a hollow motor shaft; a driving hypoid gear passing through the interior of the hollow motor shaft, the axis of the driving hypoid gear being aligned with the axis of the hollow motor shaft, and the driving hypoid gear transmitting power within the drive motor; a first bearing disposed at a first end of the gear shaft of the driving hypoid gear; and a second bearing disposed at a second end of the gear shaft; both bearings being located inside the hollow motor shaft.

[0007] In some embodiments, the drive motor includes a housing; the housing includes: a rotor bearing mounting section for mounting a motor rotor bearing; and a first bearing mounting section for mounting a first bearing.

[0008] In some embodiments, the rotor bearing mounting section is located inside the hollow motor shaft; the first bearing, the motor rotor bearing, and the second bearing are distributed sequentially along the axis of the gear shaft.

[0009] In some embodiments, the second bearing includes: an outer ring, the outer ring including an mounting inner diameter for press-fitting with the outer wall of the rotor bearing mounting section, such that the outer ring is relatively fixed to the housing, and the outer ring has a gap distance from the inner wall of the hollow motor shaft; and an inner ring, the inner ring being fitted onto the inner wall of the outer ring, and the inner wall of the inner ring being press-fitted with the gear shaft.

[0010] In some embodiments, the outer ring has a top pressure end face at one end face away from the mounting inner diameter, and the top pressure end face is used to bear the top pressure load.

[0011] In some embodiments, the first bearing is installed between the first bearing mounting section and the gear shaft; the motor rotor bearing is installed between the drive motor and the rotor bearing mounting section.

[0012] In some embodiments, in the radial direction of the gear shaft, the first bearing mounting section is farther away from the gear shaft than the rotor bearing mounting section; a connecting section is formed between the first bearing mounting section and the rotor bearing mounting section.

[0013] In some embodiments, the motor rotor bearing is located between the connecting section and the outer ring of the second bearing, so that the connecting section and the outer ring form an axial limit on the motor rotor bearing.

[0014] In some embodiments, both the first bearing and the second bearing are tapered roller bearings.

[0015] An automobile includes an electric drive assembly as described above.

[0016] In the electric drive assembly provided in this application, the drive motor is equipped with a hollow motor shaft, allowing the active hypoid gear to pass through the interior of the hollow motor shaft for power transmission. The axis of the active hypoid gear is aligned with the axis of the hollow motor shaft. By placing the active hypoid gear inside the hollow motor shaft, the motor and reducer are integrated into the electric drive assembly. A first bearing and a second bearing are respectively provided at the first and second ends of the gear shaft of the active hypoid gear, so that the first and second bearings can support the rotation of the active hypoid gear. The second bearing is located inside the hollow motor shaft, reducing the axial dimension occupied by the bearing, shortening the axial dimension of the electric drive assembly, reducing the overall size of the electric drive assembly, and reducing the overall interior volume occupied by the electric drive assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a single-row tapered roller bearing in the prior art;

[0019] Figure 2 This is a schematic diagram of the structure of a reducer assembly in the prior art;

[0020] Figure 3 This is a schematic diagram of the structure of the electric drive assembly provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the second bearing provided in an embodiment of this application;

[0022] Figure 5 for Figure 4 The diagram shows the outer ring structure of the second bearing.

[0023] Figure 6 for Figure 4 The diagram shows the inner ring structure of the second bearing.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100-Drive motor, 101-Housing, 1011-Rotor bearing mounting section, 1012-First bearing mounting section, 102-Hollow motor shaft, 103-Motor rotor bearing;

[0026] 200 - Driving hypoid gear; 201 - Gear shaft;

[0027] 300 - First Bearing;

[0028] 400 - Second bearing, 401 - Outer ring, 4011 - Mounting inner diameter, 4012 - Top pressure end face, 402 - Inner ring. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise.

[0031] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0032] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0033] like Figures 1-2 As shown, in existing reducer assemblies, single-row tapered roller bearings are typically used at both ends of the driving hypoid gear shaft to bear the radial and axial loads on the driving hypoid gear; however, due to... Figure 1 It can be seen that, Figure 1 'a' represents the outer ring of a single-row tapered roller bearing. Figure 1 b represents the inner ring of the single-row tapered roller bearing. The outer ring of the single-row tapered roller bearing needs to be fixed relative to the housing of the reducer assembly. This requires other components in the electric drive assembly to be arranged at both ends of the single-row tapered roller bearing, increasing the axial dimension of the electric drive assembly and thus increasing the overall interior space occupied by the electric drive assembly.

[0034] This application provides an electric drive assembly and a vehicle that reduces the size of the electric drive assembly.

[0035] like Figure 3As shown, the electric drive assembly provided in this application embodiment includes a drive motor 100, an active hypoid gear 200, a first bearing 300, and a second bearing 400. The drive motor 100 is equipped with a hollow motor shaft 102, and a driving hypoid gear 200 passes through the interior of the hollow motor shaft 102. The axis of the driving hypoid gear 200 is aligned with the axis of the hollow motor shaft 102, enabling the driving hypoid gear 200 to transmit power within the drive motor 100, thus integrating the motor and reducer into the electric drive assembly. A first bearing 300 and a second bearing 400 are respectively provided at the first and second ends of the gear shaft 201 of the driving hypoid gear 200, so that the first bearing 300 and the second bearing 400 can support the rotation of the driving hypoid gear. The second bearing 400 is located inside the hollow motor shaft 102, which reduces the axial dimension occupied by the bearing, shortens the axial dimension of the electric drive assembly, reduces the overall size of the electric drive assembly, and reduces the overall interior space occupied by the electric drive assembly.

[0036] It should be noted that, as Figure 3 As shown, the first end of the gear shaft 201 is Figure 3 The second end of the gear shaft 201 is located at one end on the left side near the body of the active hypoid gear. Figure 3 At the other end on the right side, the first end and the second end of the gear shaft 201 are supported by the first bearing 300 and the second bearing 400 respectively, so as to bear the axial load and radial load of the active hypoid gear 200.

[0037] In the electric drive assembly provided in this application embodiment, both the first bearing 300 and the second bearing 400 are tapered roller bearings. The tapered roller bearings are separable bearings, which can be installed by fixing the outer ring and inner ring of the tapered roller bearings respectively, thereby improving the convenience of bearing installation in the electric drive assembly provided in this application embodiment.

[0038] like Figure 3 As shown, the drive motor 100 includes a housing 101, which includes a rotor bearing mounting section 1011 and a first bearing mounting section 1012. The rotor bearing mounting section 1011 is used to mount a motor rotor bearing 103, and the motor rotor bearing 103 is mounted between the drive motor 100 and the rotor bearing mounting section 1011 to support the rotation of the drive motor 100.

[0039] The first bearing mounting section 1012 is used to mount the first bearing 300, and the first bearing 300 is mounted between the first bearing mounting section 1012 and the first end of the gear shaft 201, so that the first bearing 300 can support the rotation of the gear shaft 201.

[0040] like Figure 3 As shown, the rotor bearing mounting section 1011 is located inside the hollow motor shaft 102; and the first bearing 300, the motor rotor bearing 103, and the second bearing 400 are distributed sequentially along the axis of the gear shaft 201, so that the second bearing 400 is located inside the hollow motor shaft 102, reducing the axial dimension of the drive assembly.

[0041] like Figures 3-6 As shown, the second bearing 400 includes an outer ring 401 and an inner ring 402; wherein, the outer ring 401 includes a mounting inner diameter 4011, which is used to press against the outer wall of the rotor bearing mounting section 1011 so that the outer ring 401 can be fixed relative to the housing 101, and there is a gap between the outer ring 401 and the inner wall of the hollow motor shaft 102 so that the outer ring 401 of the second bearing 400 will not affect the normal operation of the drive motor 100;

[0042] The inner ring 402 is fitted onto the inner wall of the outer ring 401, and the inner wall of the inner ring 402 is used to press against the second end of the gear shaft 201 so that the second bearing 400 can support the second end of the gear shaft 201.

[0043] like Figure 5 As shown, a pressing end face 4012 is provided on the inner wall of the outer ring 401 away from the mounting inner diameter 4011. The pressing end face 4012 is used to bear the pressing load. In actual installation, the pressing end face 4012 is pressed by the tool so that the mounting inner diameter 4011 can be pressed into the outer wall of the rotor bearing mounting section 1011, thereby realizing the installation of the outer ring 401.

[0044] To enable the installation of the second bearing 400.

[0045] like Figure 3 As shown, in the radial direction of the gear shaft 201, the first bearing mounting section 1012 is farther away from the gear shaft 201 than the rotor bearing mounting section 1011; a connecting section is formed between the first bearing mounting section 1012 and the rotor bearing mounting section 1011 to connect the first bearing mounting section 1012 and the rotor bearing mounting section 1011.

[0046] The motor rotor bearing 103 is located between the connecting section and the outer ring 401 of the second bearing 400, so that the connecting section and the outer ring 401 form an axial limit on the motor rotor bearing 103, reducing the structure that needs to be axially limited separately for the motor rotor bearing 103, further shortening the axial dimension of the drive assembly, and reducing the overall size of the drive assembly.

[0047] In the assembly process of the electric drive assembly provided in this application embodiment, firstly, the motor rotor bearing 103 is press-fitted onto the hollow motor shaft 102. Then, the assembled motor rotor bearing 103 and hollow motor shaft 102 are press-fitted together between the rotor bearing mounting section 1011. Next, the outer ring 401 of the second bearing 400 is press-fitted onto the outer wall of the rotor bearing mounting section 1011 to achieve axial positioning of the motor rotor bearing 103. Then, the first bearing 300 is installed between the first bearing mounting section 1012 and the gear shaft 201. Finally, the driving hypoid gear 200 is driven along... Figure 3 The left side of the bearing is inserted into the rotor bearing mounting section 1011, and then the inner ring 402 of the second bearing 400 is pressed between the outer ring 401 and the gear shaft 201, thereby realizing the installation of the first bearing 300 and the second bearing 400. This reduces the space occupied by the bearings in the axial dimension, shortens the axial dimension of the electric drive assembly, reduces the overall size of the electric drive assembly, and reduces the overall interior space occupied by the electric drive assembly.

[0048] This application also provides a vehicle that includes the electric drive assembly described in the above embodiments.

[0049] Since the electric drive assembly described above has the aforementioned technical effects, and the automobile described above includes the electric drive assembly, the automobile also has the corresponding technical effects, which will not be elaborated here.

Claims

1. An electric drive assembly, characterized by The application relates to a driving motor (100) configured with a hollow motor shaft (102), a driving hypoid gear (200) penetrating the inside of the hollow motor shaft (102), the axis of the driving hypoid gear (200) being consistent with the axis of the hollow motor shaft (102), the driving hypoid gear (200) transmitting power in the driving motor (100), a first bearing (300) arranged at the first end of the gear shaft (201) of the driving hypoid gear (200), a second bearing (400) arranged at the second end of the gear shaft (201), and the second bearing (400) being located in the inside of the hollow motor shaft (102). The driving motor (100) comprises a shell (101). The shell (101) comprises a rotor bearing mounting section (1011) for mounting a motor rotor bearing (103), and a first bearing mounting section (1012) for mounting the first bearing (300). The rotor bearing mounting section (1011) is located in the inside of the hollow motor shaft (102). The first bearing (300), the motor rotor bearing (103) and the second bearing (400) are sequentially distributed along the axis of the gear shaft (201). The second bearing (400) comprises an outer ring (401) comprising a mounting inner diameter (4011) for press-fitting with the outer wall of the rotor bearing mounting section (1011), so that the outer ring (401) is relatively fixed with the shell (101) and has a spacing distance with the inner wall of the hollow motor shaft (102), and an inner ring (402) assembled on the inner wall of the outer ring (401) and used for press-fitting with the gear shaft (201).

2. The electric drive assembly of claim 1, wherein, The outer ring (401) is provided with a top pressing end face (4012) on the inner wall of the end away from the mounting inner diameter (4011), and the top pressing end face (4012) is used for bearing top pressing load. The first bearing (300) is mounted between the first bearing mounting section (1012) and the gear shaft (201). The motor rotor bearing (103) is mounted between the driving motor (100) and the rotor bearing mounting section (1011). In the radial direction of the gear shaft (201), the first bearing mounting section (1012) is farther away from the gear shaft (201) than the rotor bearing mounting section (1011).

3. The electric drive assembly of claim 2, wherein, A connecting section is formed between the first bearing mounting section (1012) and the rotor bearing mounting section (1011). ​ 4. The electric drive assembly of claim 3, wherein, ​ ​ ​ 5. The electric drive assembly of claim 4, wherein, ​ 6. The electric drive assembly of claim 4, wherein, ​ ​ 7. The electric drive assembly of claim 6, wherein, ​ ​ 8. The electric drive assembly of claim 7, wherein, The motor rotor bearing (103) is located between the connecting section and an outer ring (401) of the second bearing (400), so that the connecting section and the outer ring (401) form axial limiting of the motor rotor bearing (103).

9. The electric drive assembly of any one of claims 1-8, wherein, The first bearing (300) and the second bearing (400) are both tapered roller bearings.

10. An automobile characterized by comprising: An electric drive assembly comprising a motor rotor bearing (103) according to any one of claims 1-9.

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