Electric drive assembly system and vehicle

Abstract

Disclosed is an electric drive assembly system, comprising a housing, and within the housing: a motor assembly comprising a motor shaft, the motor shaft comprising a first motor shaft end and a second motor shaft end; the gearbox assembly comprises an input shaft, the input shaft comprises a first input shaft end and a second input shaft end, the first input shaft end is inserted into the second motor shaft end, and the first input shaft end and the second motor shaft end form a connecting part, so that the input shaft and the motor shaft coaxially and jointly rotate; the first bearing is supported at the end part of the first motor shaft; the second bearing is supported at the end part of the second input shaft; wherein the connecting part comprises a spline connecting part and a radial centering part, the electric drive assembly system further comprises a third bearing, and the third bearing is supported on the end part of the second motor shaft at the radial centering part. The invention further discloses a vehicle which comprises the electric drive assembly system.

Description

Technical Field

[0001] The present invention relates to an electric drive assembly system, which can be used in a vehicle, such as an electric vehicle or a hybrid vehicle. The present invention also relates to a vehicle comprising such an electric drive assembly system. Background Art

[0002] The electric drive assembly system is the core power source of, for example, an electric or hybrid vehicle, which generally includes a motor and a gearbox, wherein the motor shaft of the motor and the input shaft of the gearbox are connected to each other to transmit torque, and undergo high-speed rotation during operation. Therefore, it should be ensured that the motor shaft of the motor and the input shaft of the gearbox are well aligned relative to each other to avoid vibrations caused by radial eccentricity and the noise caused thereby, as well as relatively low transmission efficiency. In addition, the axial positioning of the motor shaft and the input shaft should also be ensured to further promote the robustness of the entire electric drive assembly system. At the same time, the stable connection between the motor shaft and the input shaft of the gearbox and the stable support of the motor shaft and the input shaft should also be ensured with a compact structure, ensuring that they operate in an optimal state and thus ensuring high transmission efficiency. However, no solution has been proposed in the prior art that can achieve these technical effects at the same time.

[0003] The present invention aims to achieve these technical effects through a simple and compact structure. Summary of the invention

[0004] To this end, the present disclosure provides an electric drive assembly system, which includes a housing and:

[0005] A motor assembly comprising a motor shaft, the motor shaft comprising a first motor shaft end and a second motor shaft end,

[0006] A gearbox assembly, comprising an input shaft, the input shaft comprising a first input shaft end and a second input shaft end, the first input shaft end being inserted into the second motor shaft end and forming a coupling portion with the second motor shaft end so that the input shaft and the motor shaft coaxially rotate together,

[0007] a first bearing supported at an end of the first motor shaft,

[0008] A second bearing, supported at the end of the second input shaft,

[0009] Wherein: the connection portion includes a spline connection portion and a radial centering portion; the electric drive assembly system also includes a third bearing, and the third bearing is supported on the end of the second motor shaft at the radial centering portion.

[0010] Therefore, the electric drive assembly system proposed in the present disclosure can at least achieve the following technical effects. The connection portion formed by the motor shaft of the motor assembly and the input shaft of the gearbox assembly includes a spline connection portion and a radial centering portion, so that the torque transmission between the motor shaft and the input shaft can be ensured, and the good centering of the motor shaft and the input shaft relative to each other can be ensured, effectively avoiding the vibration and noise caused by the radial eccentricity between the motor shaft and the input shaft, and ensuring the effective torque transmission from the motor shaft to the input shaft of the gearbox assembly. At the same time, the use of the first bearing, the second bearing and the third bearing defined above helps to achieve good and stable support for the motor shaft and the input shaft and thus the motor assembly and the gearbox assembly in a compact structure. In particular, this layout of the three bearings and the positioning of the connection portion relative to them and relative to the motor shaft and the input shaft allow the input shaft and the motor shaft of the gearbox assembly to be particularly firmly supported, further reducing vibration and noise, and allowing the teeth of the gears of the gearbox assembly to be micro-modified, ensuring that the gears can present their best state during operation to achieve the best performance, and further facilitating noise reduction.

[0011] The electric drive assembly system proposed by the present invention may also include one or more of the following aspects, which may be adopted individually or in combination.

[0012] In some embodiments, the radial centering portion includes a radial inner surface of the motor shaft and a radial outer surface of the input shaft that is in clearance fit with the radial inner surface. Such a radial centering portion can ensure good centering while being very easy to process and assemble, further improving cost-effectiveness.

[0013] In some embodiments, the radial centering portion is disposed at the end of the second motor shaft end, which allows the third bearing to be close to the gear of the gearbox assembly to provide better support for the gear, so that the gear deforms less when subjected to force and does not bounce up and down, thereby promoting stable operation of the system.

[0014] In some embodiments, the third bearing includes a third bearing inner ring and a third bearing outer ring, a shoulder is provided at the end of the second motor shaft, a retaining ring is provided at the second axial end of the third bearing inner ring and on the end of the second motor shaft, and the third bearing inner ring abuts against the shoulder at the first axial end and against the retaining ring at the second axial end. Thus, the axial positioning and retention of the motor shaft can be ensured in a very compact structure and simple manner, promoting the stable operation of the system.

[0015] In some embodiments, the electric drive assembly system further comprises a parking ratchet sleeved on the input shaft, and the retaining ring radially abuts against the parking ratchet, which allows a compact structure to be further ensured while ensuring axial positioning and retention of the motor shaft.

[0016] In some embodiments, the housing is provided with a third bearing seat for accommodating the third bearing, and the outer ring of the third bearing is axially held by the third bearing seat and a first pressure plate fixed relative to the housing. This allows a simple and compact structure to achieve stable axial holding and positioning of the third bearing.

[0017] In some embodiments, the first bearing includes a first bearing inner ring and a first bearing outer ring, and an elastic member capable of applying an axial preload force to the first bearing is disposed between the first bearing outer ring and the housing. The provision of the elastic member allows the axial positioning of the motor shaft relative to the input shaft of the gearbox assembly to be ensured in a very simple and dynamic manner, thereby ensuring torque transmission efficiency, which is beneficial to the robustness of the entire electric drive assembly system.

[0018] In some embodiments, the second bearing includes a second bearing inner ring and a second bearing outer ring, the housing is further provided with a second bearing seat for accommodating the second bearing, and the second bearing outer ring is axially held by the second bearing seat and a second pressure plate fixed relative to the housing. This allows a simple and compact structure to achieve stable axial holding and positioning of the second bearing.

[0019] In some embodiments, the size of the second bearing is larger than the size of the first bearing and the size of the third bearing, and the size of the third bearing is larger than the size of the first bearing. This can ensure optimal support of the motor shaft and the input shaft in a cost-effective and space-compact manner.

[0020] In some embodiments, the gearbox assembly adopts a two-stage helical gear parallel shaft arrangement and includes a differential, which can allow a more compact overall structure to be achieved.

[0021] The present invention also relates to a vehicle, comprising the electric drive assembly system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] In the figure:

[0024] Figure 1 A cross-sectional view of an electric drive assembly system according to an embodiment of the present invention is shown.

[0025] Reference numerals

[0026] 10Electric drive assembly system

[0027] 100 Shell

[0028] 200 motor components

[0029] 210 motor shaft

[0030] 211 first motor shaft end

[0031] 212 Second motor shaft end

[0032] 213 Shoulder

[0033] 230 retaining ring

[0034] 300 gearbox assembly

[0035] 310 Input shaft

[0036] 311 First input shaft end

[0037] 312 Second input shaft end

[0038] 330 parking ratchet

[0039] 331 axial extension

[0040] 400 first bearing

[0041] 410 first bearing inner ring

[0042] 420 first bearing outer ring

[0043] 500 Second bearing

[0044] 510 second bearing inner ring

[0045] 520 second bearing outer ring

[0046] 530 second bearing seat

[0047] 540 Second pressure plate

[0048] 600 third bearing

[0049] 610 third bearing inner ring

[0050] 611 first axial end

[0051] 612 second axial end

[0052] 620 third bearing outer ring

[0053] 630 third bearing seat

[0054] 631 radial extension

[0055] 640 first pressure plate

[0056] S spline connection

[0057] C Radial centering DETAILED DESCRIPTION

[0058] The electric drive assembly system according to the embodiment of the present disclosure is described in detail with reference to the accompanying drawings. In order to make the purpose, technical solution and advantages of the present utility model more clear, the technical solution in the embodiment of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present disclosure. Obviously, the described embodiment is a part of the embodiment of the present disclosure, not all of the embodiments.

[0059] Therefore, the following detailed description of the embodiments of the present disclosure provided in conjunction with the accompanying drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0060] Unless otherwise defined in the context, the singular includes the plural. Throughout the specification, the terms "comprising", "having", etc. are used herein to specify the presence of the features, numbers, steps, operations, elements, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts or combinations thereof.

[0061] In addition, even though terms including ordinal numbers such as "first," "second," etc. may be used to describe various components, these components are not limited by these terms, and these terms are only used to distinguish one element from other elements. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component without departing from the scope of the present disclosure.

[0062] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the disclosed product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0063] The present invention relates to an electric drive assembly system 10, which is used, for example, in electric vehicles or hybrid vehicles, and generally includes an inverter (not shown), a motor assembly 200 and a gearbox assembly 300. The inverter is connected to the motor assembly 200 and provides the motor assembly 200 with required electrical energy. The electrical energy is converted into mechanical energy inside the motor assembly 200, and the motor assembly 200 transmits the mechanical energy to the gearbox assembly 300. The gearbox assembly 300 generally transmits the mechanical energy to, for example, vehicle wheels via a differential included therein to drive the wheel movement.

[0064] Specifically, Figure 1 As shown, the electric drive assembly system 10 proposed by the present invention includes a housing 100, in which a motor assembly 200 and a gearbox assembly 300 and a support structure for supporting the motor assembly 200 and the gearbox assembly 300 are accommodated. In a specific embodiment, the interior of the housing 100 can be divided into a first part for accommodating the motor assembly 200 and a second part for accommodating the gearbox assembly 300. In some embodiments, as Figure 1 , the housing 100 can be constructed to include a single body shared by the motor assembly 200 and the gearbox assembly 300, which can reduce the number of parts, simplify the assembly process, achieve a lighter housing, and facilitate space compactness. In other embodiments (not shown), the housing 100 can be constructed to include a first housing for accommodating the motor assembly 200 and a second housing for accommodating the gearbox assembly 300, the first housing and the second housing are manufactured separately and can be assembled together, which facilitates modular manufacturing and allows a more flexible design of the motor assembly 200 and the gearbox assembly 300.

[0065] like Figure 1 As shown, the motor assembly 200 includes a motor shaft 210, which is rotatable about a rotation axis X and includes a first motor shaft end 211 and a second motor shaft end 212 that are axially opposite. The first motor shaft end 211 can be supported by a first bearing 400. In a specific embodiment, the first bearing 400 can be positioned in a first bearing seat provided on the housing 100, and the first bearing seat can be more specifically provided in the housing 100.

[0066] like Figure 1 As shown, the gearbox assembly 300 includes an input shaft 310, and the input shaft 310 includes a first input shaft end 311 and a second input shaft end 312 in opposite axial directions. The second input shaft end 312 can be supported by a second bearing 500. In a specific embodiment, the second bearing 500 can be positioned in a second bearing seat 530 provided on the housing 100, and the second bearing seat 530 can be more specifically provided in an end cover of the housing 100, which is beneficial to overall compactness and system stability.

[0067] like Figure 1 As shown, in the electric drive assembly system 10 proposed in the present invention, the first input shaft end 311 can be inserted into the second motor shaft end 212 and form a connection portion with the second motor shaft end 212, so that the input shaft 310 can coaxially rotate with the motor shaft 210, that is, the input shaft 310 can also rotate around the rotation axis X. In one embodiment, the connection portion may include a spline connection portion S and a radial centering portion C, the spline connection portion S is configured to achieve torque transmission from the motor shaft 210 to the input shaft 310, and the radial centering portion C is configured to ensure radial centering of the motor shaft 210 and the input shaft 310 relative to each other. More specifically, a third bearing 600 may also be provided, the third bearing 600 being supported at the second motor shaft end 212 and, for example, located in a third bearing seat 630 provided in the housing 100. The third bearing 600 may more specifically support the second motor shaft end 212 at the connection portion, so as to simultaneously support the motor shaft 210 and the input shaft 310. More specifically, in this case, the third bearing 600 may be arranged to be supported on the second motor shaft end 212 at the radial centering portion C.

[0068] Therefore, in the electric drive assembly system 10 proposed in the present disclosure, the connection portion formed by the motor shaft 210 of the motor assembly 200 and the input shaft 310 of the gearbox assembly 300 includes a spline connection portion S and a radial centering portion C, so that while achieving torque transmission between the motor shaft 210 and the input shaft 310, the motor shaft 210 and the input shaft 310 are ensured to be well aligned with each other, effectively avoiding vibration and noise caused by radial eccentricity between the motor shaft 210 and the input shaft 310, and thereby ensuring efficient and stable torque transmission from the motor shaft 210 to the input shaft 310 of the gearbox assembly 300. At the same time, the use of the first bearing 400, the second bearing 500 and the third bearing 600 defined above helps to achieve good and stable support for the motor shaft 210 and the input shaft 310 and therefore the motor assembly 200 and the gearbox assembly 300 in a compact structure. In particular, this layout of the three bearings and the positioning of the connecting parts relative to them and relative to the motor shaft 210 and the input shaft 310 allow the input shaft 310 and the motor shaft 210 of the gearbox assembly 300 to be particularly firmly supported, further reducing vibration and noise, and allowing the teeth of the gears of the gearbox assembly 300 to be micro-modified, ensuring that the gears can present their optimal state during operation to achieve optimal performance, and further facilitating noise reduction.

[0069] In some embodiments, Figure 1As shown, the radial centering portion C includes the radial inner surface of the motor shaft 210 and the radial outer surface of the input shaft 310 that is in clearance fit with the radial inner surface. Such a radial centering portion C can ensure good centering while being very easy to process and assemble, further improving cost-effectiveness. Figure 1 In the specific embodiment shown, the radial outer surface of the input shaft 310 forming the radial centering portion C can be formed on the annular protrusion. As a result, the centering portion C is composed of a structure that is easy to process, saving design, processing and assembly costs. Of course, this design of the radial centering portion is only exemplary and not exclusive, and any common structure that can achieve radial centering of the motor shaft and the input shaft is within the protection scope of the present invention.

[0070] In some embodiments, Figure 1 As shown, the radial centering portion C can be disposed at or near the end of the second motor shaft end 212. This allows the third bearing 600 to be close to the gear of the gearbox assembly 300 to provide better support for the gear, so that the gear is less deformed and does not jump up and down when subjected to force, thereby promoting stable operation of the system. In a more specific embodiment, as Figure 1 As shown, the radial centering portion C and the spline connection portion S are arranged adjacent to each other in the axial direction. Such a structure allows the corresponding radial centering portion C and the spline connection portion S to be conveniently machined on the motor shaft 210 and the input shaft 310, and is conducive to simplifying the assembly between the motor shaft 210 and the input shaft 310, thereby saving design, manufacturing and assembly costs and improving cost-effectiveness.

[0071] In addition, the electric drive assembly system 10 proposed in the present invention is also provided with a series of axial positioning designs to ensure that the motor shaft 210 of the motor assembly 200 and the input shaft 310 of the gearbox assembly 300 can be maintained in the desired position in the axial direction, thereby optimizing their operating performance.

[0072] In some embodiments, Figure 1As shown, the third bearing 600 may include a third bearing inner ring 610 and a third bearing outer ring 620. The second motor shaft end 212 is provided with a shoulder 213, which is configured to axially retain and position the third bearing 600. In addition, the third bearing inner ring 610 may include a first axial end 611 and a second axial end 612 axially opposite to each other, and a retaining ring 230 for axially retaining and positioning the third bearing 600 may also be provided at the second axial end 612 of the third bearing inner ring 610 and on the second motor shaft end 212. Thus, the third bearing inner ring 610 may be configured to abut the shoulder 213 on the second motor shaft end 212 at the first axial end 611 and abut the retaining ring 230 at the second axial end 612. Thus, the axial positioning and retention of the motor shaft 210 can be ensured in a very compact structure and simple manner, thereby promoting the stable operation of the system. In a specific embodiment, the electric drive assembly system 10 further includes a parking ratchet 330 sleeved on the input shaft 310 of the gearbox assembly 300, and the parking ratchet 330 is connected to the input shaft 310 via a spline, for example. In such a case, a retaining ring 230 can be arranged to radially abut against the parking ratchet 330, thereby fixing the retaining ring 230 on the second motor shaft end 212 via the parking ratchet 330. More specifically, the parking ratchet 330 includes an axial extension 331 arranged to surround the end portion of the second motor shaft end 212, and the axial extension 331 is arranged to radially retain and press against the retaining ring 230, thereby preventing the retaining ring from coming out under high-speed rotation of the motor shaft and the input shaft. This allows further ensuring a compact structure while ensuring axial positioning and retention of the motor shaft 210.

[0073] In some embodiments, Figure 1 As shown, the housing 100 is provided with a third bearing seat 630 for accommodating the third bearing 600. In a specific embodiment, the third bearing outer ring 620 is axially retained by the third bearing seat 630, more specifically, a radial extension 631 of the third bearing seat 630 and a first pressure plate 640 fixed relative to the housing 100. This allows the third bearing 600 to be firmly axially retained and positioned with a simple and compact structure.

[0074] In some embodiments, Figure 1 As shown, the second bearing 500 includes a second bearing inner ring 510 and a second bearing outer ring 520, and the housing 100 may also be provided with a second bearing seat 530 for accommodating the second bearing 500. In this case, the second bearing outer ring 520 may be axially retained by the second bearing seat 530 and a second pressure plate 540 fixed relative to the housing 100. This allows the second bearing 500 to be firmly axially retained and positioned with a simple and compact structure.

[0075] In some embodiments, Figure 1As shown, the first bearing 400 includes a first bearing inner ring 410 and a first bearing outer ring 420, and an elastic member (not shown) capable of applying an axial preload force to the first bearing 400 may be provided between the first bearing outer ring 420 and the housing 100. The elastic member is, for example, a wave spring, which can apply an axial preload force to the first shaft bearing 400, for example, applying an axial preload force toward the input shaft 310 of the gearbox assembly 300, so as to conveniently and dynamically adjust the axial positioning of the motor shaft 210 relative to the input shaft 310, thereby ensuring the torque transmission efficiency, which is beneficial to the robustness of the entire electric drive assembly system 10.

[0076] In some embodiments, the size of the second bearing 500 is larger than the size of the first bearing 400 and the size of the third bearing 600, and the size of the third bearing 600 is larger than the size of the first bearing 400. This can ensure optimal support of the motor shaft 210 and the input shaft 310 in a cost-effective and space-compact manner.

[0077] In some embodiments, the gearbox assembly 300 employs a two-stage helical gear parallel axis arrangement, which may allow for a more compact overall structure. In addition, the gearbox assembly 300 may include a differential, which may be coupled to a vehicle wheel, for example, and thus transmit torque to the wheel.

[0078] The present invention also relates to a vehicle, comprising an electric drive assembly system as described above. The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a range extended electric vehicle (Range extended EV), or a fuel cell electric vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle.

[0079] The exemplary implementation of the electric drive assembly system proposed in the present invention is described in detail above with reference to the preferred embodiments. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may be combined in various ways without exceeding the scope of protection of the present invention.

[0080] The scope of the present disclosure is not limited by the above-described embodiments but by the appended claims and their equivalents.

Claims

1. An electric drive assembly system, comprising a housing (100), and located in the housing (100): A motor assembly (200) comprises a motor shaft (210), wherein the motor shaft (210) comprises a first motor shaft end (211) and a second motor shaft end (212), A gearbox assembly (300) includes an input shaft (310), the input shaft (310) including a first input shaft end (311) and a second input shaft end (312), the first input shaft end (311) being inserted into the second motor shaft end (212) and forming a coupling portion with the second motor shaft end (212), so that the input shaft (310) and the motor shaft (210) coaxially rotate together. A first bearing (400) is supported at the end (211) of the first motor shaft, A second bearing (500) is supported at the second input shaft end (312), in: The connection portion comprises a spline connection portion (S) and a radial centering portion (C), The electric drive assembly system also includes a third bearing (600), which is supported on the second motor shaft end (212) at the radial centering portion (C).

2. The electric drive assembly system according to claim 1, wherein: The radial centering portion (C) includes a radial inner surface of the motor shaft (210) and a radial outer surface of the input shaft (310) which is clearance-matched with the radial inner surface.

3. The electric drive assembly system according to claim 1 or 2, wherein: The radial centering portion (C) is disposed at a distal end of the second motor shaft end (212).

4. The electric drive assembly system according to claim 1 or 2, wherein: The third bearing (600) comprises a third bearing inner ring (610) and a third bearing outer ring (620). The second motor shaft end (212) is provided with a shoulder (213), A retaining ring (230) is provided at the second axial end (612) of the third bearing inner ring (610) and on the second motor shaft end (212). The third bearing inner ring (610) abuts against the shoulder (213) at a first axial end (611) and abuts against the retaining ring (230) at a second axial end (612).

5. The electric drive assembly system according to claim 4, further comprising a parking ratchet (330) sleeved on the input shaft (310), wherein the retaining ring (230) radially abuts against the parking ratchet (330).

6. The electric drive assembly system according to claim 4, wherein: The housing (100) is provided with a third bearing seat (630) for accommodating the third bearing (600). The third bearing outer ring (620) is axially held by the third bearing seat (630) and a first pressure plate (640) fixed relative to the housing (100).

7. The electric drive assembly system according to claim 1 or 2, wherein: The first bearing (400) comprises a first bearing inner ring (410) and a first bearing outer ring (420), and an elastic component capable of applying an axial preload force to the first bearing (400) is arranged between the first bearing outer ring (420) and the housing (100).

8. The electric drive assembly system according to claim 1 or 2, wherein: The second bearing (500) comprises a second bearing inner ring (510) and a second bearing outer ring (520). The housing (100) is further provided with a second bearing seat (530) for accommodating the second bearing (500). The second bearing outer ring (520) is held in the axial direction by the second bearing seat (530) and a second pressure plate (540) fixed relative to the housing (100).

9. The electric drive assembly system according to claim 1 or 2, wherein: The size of the second bearing (500) is larger than the size of the first bearing (400) and the size of the third bearing (600), and the size of the third bearing (600) is larger than the size of the first bearing (400).

10. The electric drive assembly system according to claim 1 or 2, wherein: The gearbox assembly (300) adopts a two-stage helical gear parallel axis arrangement and includes a differential.

11. A vehicle comprising the electric drive assembly system (10) according to any one of claims 1 to 10.

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