Dual-motor electric drive shell and electric drive system thereof

Abstract

The application belongs to the technical field of electric drive systems, and provides a double-motor electric drive shell and an electric drive system thereof, which comprises a middle shell, a first motor shell, a second motor shell and an electric drive controller; the volume of the first motor shell is greater than that of the second motor shell, and the axis of the second motor after installation is lower than that of the first motor; the top of the first motor shell is higher than that of the second motor shell to form an avoiding space, and the electric drive controller is arranged in the avoiding space. In the application, the first motor shell and the second motor shell with different volumes are arranged in a staggered manner to form the avoiding space, and the electric drive controller is arranged in the avoiding space, so that the structure of the whole double-motor electric drive shell is more compact, the volume is small, the integration degree is higher, and the space utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric drive systems, and in particular, relates to a double-motor electric drive shell and an electric drive system thereof. BACKGROUND

[0002] In the current electric drive system, the motor and the differential transmission mechanism are usually integrated in the same electric drive shell, so that the transmission distance from the motor to the differential transmission mechanism and then from the differential transmission mechanism can be shorter, so as to reduce the power loss in the transmission process; and with the integrated application of the double motor, the internal structure of the electric drive shell is more complex.

[0003] In the existing double-motor electric drive system, the volumes of the two motors are consistent, and a symmetrical layout is usually adopted, such as the common "T" layout. However, in this structure, the electric drive controller needs to be arranged at the top of the electric drive shell, so that after the whole is formed, there is an obvious boundary separation between the motor shell part and the electric drive controller part, the integration degree is not high, and the Z-direction size is obviously increased; and when installed, the structure of the vehicle body end needs to be avoided, and the space utilization is low. SUMMARY

[0004] In order to overcome at least one of the above-mentioned disadvantages of the prior art, the purpose of the present application is to provide a double-motor electric drive shell and an electric drive system thereof.

[0005] The technical means adopted by the present application to solve the above technical problems is:

[0006] In the embodiment scheme of the present application, a double-motor electric drive shell is provided, which comprises:

[0007] An intermediate shell for mounting a differential assembly;

[0008] A first motor shell for mounting a first motor, the first motor shell being arranged on one side surface of the intermediate shell;

[0009] A second motor shell for mounting a second motor, the second motor shell being arranged on the other side surface of the intermediate shell; the volume of the first motor shell is greater than that of the second motor shell, and the axis of the second motor after installation is lower than that of the first motor, and the top of the first motor shell is higher than that of the second motor shell to form an avoiding space;

[0010] An electric drive controller arranged in the avoiding space.

[0011] In some embodiments, a gear shifting mechanism is arranged on the intermediate shell, and the gear shifting mechanism comprises a gear shifting mechanism shell and an output part.

[0012] The shift mechanism housing is arranged between the first motor housing and the second motor housing and at the rear side of the electric drive controller.

[0013] The output portion extends into the intermediate housing and is in transmission connection with the differential assembly.

[0014] In some embodiments, an oil cooler is arranged on the first motor housing, the oil cooler being arranged at the front side of the first motor housing and above the axis of the first motor after installation.

[0015] In some embodiments, an oil pump is arranged on the first motor housing, the oil pump being arranged at the front side of the first motor housing and below the axis of the first motor after installation.

[0016] In some embodiments, an oil filling hole and an oil draining hole are arranged on the double-motor electric drive housing, the position height of the oil filling hole being higher than that of the oil draining hole.

[0017] The oil filling hole is arranged at the front side of the intermediate housing or the first motor housing, and the oil draining hole is arranged at the side of the intermediate housing or the first motor housing.

[0018] In some embodiments, the top of the first motor housing is inclined and provided with a ventilation hole.

[0019] One end of the ventilation hole is in communication with the interior of the first motor housing, and the other end is provided with a ventilation valve.

[0020] In some embodiments, an extension pipe section is arranged between the ventilation hole and the ventilation valve, the extension pipe section being an elastic pipe section.

[0021] In some embodiments, a plurality of hanging installation holes are arranged on the double-motor electric drive housing, and a top contact surface is formed on the outside of the hanging installation hole.

[0022] In some embodiments, the first motor housing comprises a first shell, the first shell is provided with a first hanging installation hole, and the direction of the first hanging installation hole is parallel to the axis of the first motor.

[0023] The outside of the second motor housing is provided with a first hanging piece, the first hanging piece is provided with a second hanging installation hole, and the direction of the second hanging installation hole is parallel to the axis of the second motor.

[0024] The front side of the double-motor electric drive housing is provided with a plurality of second hanging pieces, and the second hanging pieces are provided with third hanging installation holes.

[0025] The embodiment of the application also provides an electric drive system, comprising a differential assembly, a first motor, a second motor and the double-motor electric drive shell.

[0026] The differential assembly is mounted on the middle shell, the first motor is mounted on the first motor shell and is in transmission connection with the differential assembly, and the second motor is mounted on the second motor shell and is in transmission connection with the differential assembly.

[0027] The first motor and the second motor are electrically connected with the electric drive controller.

[0028] Compared with the prior art, the application has at least the following beneficial effects:

[0029] In the application, the first motor shell and the second motor shell with different volumes are arranged in a staggered manner to form the avoiding space, and the electric drive controller is arranged in the avoiding space, so that the structure of the double-motor electric drive shell can be more compact, small in volume, high in integration, and convenient for improving the space utilization. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the double-motor electric drive shell according to an example of the application.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the double-motor electric drive shell according to an example of the application.

[0033] Figure 3 It is a schematic diagram of the top view structure of the double-motor electric drive shell according to an example of the application.

[0034] Figure 4 It is a schematic diagram of the side view (rear) structure of the double-motor electric drive shell according to an example of the application.

[0035] Figure 5 It is a schematic diagram of the side view (rear) structure of the double-motor electric drive shell according to an example of the application.

[0036] Figure 6 It is a schematic diagram of the side view (front) structure of the double-motor electric drive shell according to an example of the application.

[0037] Figure 7Figure 1 is a side view (right) structural schematic diagram of a double-motor electric drive shell according to an example of the present application.

[0038] Figure 8 Figure 2 is a side view (left) structural schematic diagram of a double-motor electric drive shell according to an example of the present application.

[0039] Legend:

[0040] 1 - intermediate shell, 11 - gear shifting mechanism, 111 - gear shifting mechanism shell, 112 - output part;

[0041] 2 - first motor shell, 21 - main shell, 211 - upper outer extension rib, 212 - lower outer extension rib, 213 - output shaft connecting part, 22 - first outer shell, 23 - oil cooler, 24 - oil pump, 25 - oil filling hole, 26 - oil drain hole, 27 - air vent channel, 271 - air vent valve;

[0042] 3 - second motor shell, 31 - first hanging part;

[0043] 4 - avoidance space;

[0044] 5 - electric drive controller;

[0045] 6 - mounting installation hole, 60 - top abutting contact surface, 601 - weight reduction groove, 61 - first mounting installation hole, 62 - second mounting installation hole, 63 - third mounting installation hole;

[0046] 7 - second hanging part. DETAILED DESCRIPTION

[0047] In order to enable a more clear understanding of the above-mentioned objects, features and advantages of the present application, the present application will be described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application. The described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0048] It should be noted that unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. Like reference numerals and letters indicate like items throughout the drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in the subsequent drawings. Also, in the description of the application, the terms "first", "second", etc. are used only for distinguishing between similar items, and do not imply or suggest relative importance.

[0049] As shown in the embodiment, a double-motor electric drive shell is provided, comprising: Figures 1 to 8

[0050] a middle shell 1 for mounting a differential assembly;

[0051] a first motor shell 2 for mounting a first motor, the first motor shell 2 being arranged at one side of the middle shell 1;

[0052] a second motor shell 3 for mounting a second motor, the second motor shell 3 being arranged at the other side of the middle shell 1; the volume of the first motor shell 2 is greater than that of the second motor shell 3, and the axis of the second motor after installation is lower than that of the first motor, and the top of the first motor shell 2 is higher than that of the second motor shell 3 to form an avoiding space 4;

[0053] an electric drive controller 5 arranged in the avoiding space 4.

[0054] In some embodiments, an inner cavity for mounting the differential assembly is arranged in the middle shell 1, and the inner cavity is covered by the connection between the first motor shell 2 and the middle shell 1 or the connection between the second motor shell 3 and the middle shell 1. For example, when the volume of the first motor shell 2 is greater than that of the second motor shell 3, the inner cavity can be covered by the connection between the first motor shell 2 and the middle shell 1, thereby achieving the mounting of the differential assembly in the middle shell 1.

[0055] In some embodiments, the structure and principle of the differential assembly, the first motor and the second motor can refer to the prior art, which will not be described here.

[0056] ​In some embodiments, the first motor housing 2 includes a main housing 21 and a first outer shell 22. During installation, the main housing 21 can be installed on the intermediate housing 1 first, and then the first motor can be assembled. The first outer shell 22 can then be installed on the main housing 21 to achieve the packaging of the first motor.

[0057] In some embodiments, during installation, the second motor may be first assembled in the second motor housing 3 , and then the second motor may be encapsulated by the installation connection between the second motor housing 3 and the intermediate housing 1 .

[0058] In this embodiment, the intermediate housing 1 is provided to facilitate the installation of the differential subtraction component, and the first motor housing 2 and the second motor housing 3 are provided to facilitate the installation of the first motor and the second motor, and enable the first motor and the second motor to form power transmission with the differential subtraction component, thereby realizing power control and output.

[0059] The volume of the first motor housing 2 (which can also be understood here as the power of the first motor is greater than the power of the second motor) is greater than the volume of the second motor housing 3. Therefore, the first motor housing 2 and the second motor housing 3 are staggered on the intermediate housing 1. Figure 4 For example, by setting the axis of the second motor to be lower than the axis of the first motor, the first motor housing 2 and the second motor housing 3 can be relatively flat at the bottom, as shown. Figure 4 、 Figure 5 、 Figure 6 As shown; and the avoidance space 4 formed at the top between the first motor housing 2 and the second motor housing 3 can facilitate the integrated installation of the electric drive controller 5 in the avoidance space 4, so that the electric drive controller 5 and the first motor housing 2 can be relatively level at the top, as shown Figure 5 、 Figure 6 shown.

[0060] Compared with the traditional "T"-shaped layout of the electric drive housing, the staggered design adopted in this embodiment can reduce the overall size of the electric drive housing by about 10%, and the overall integration and space utilization are higher; by arranging the electric drive controller 5 + the second motor on one side and the first motor on the other side, the center of mass remains in the middle position, and the integrated layout is more compact, and the design length of external pipelines, wiring harnesses, etc. can also be effectively shortened, thereby reducing costs.

[0061] As an example of one application, Figure 1As shown, the intermediate housing 1 is provided with a gear shifting mechanism 11, which includes a gear shifting mechanism housing 111 and an output portion 112;

[0062] The gear shifting mechanism housing 111 is arranged between the first motor housing 2 and the second motor housing 3 and located at the rear side of the electric drive controller 5.

[0063] The output portion 112 extends into the intermediate housing 1 and is in transmission connection with the differential assembly.

[0064] In some embodiments, the gear shifting mechanism 11 adopts a yoke type gear shifting mechanism, which includes a driving motor and a yoke; wherein the driving motor is arranged inside the gear shifting mechanism housing 111, and the yoke is the output portion 112, which is driven by the driving motor to operate to realize gear shifting operation.

[0065] In the embodiment, the gear shifting mechanism 11 can facilitate control of power output of the electric drive system; and by arranging the gear shifting mechanism housing 111 between the first motor housing 2 and the second motor housing 3 and at the rear side of the electric drive controller 5, the concave space formed between the intermediate housing 1, the first motor housing 2 and the second motor housing 3 can be fully utilized to further improve the overall integration, and the outer envelope space designed based on the gear shifting mechanism 11 in the prior art can be saved, thereby reducing design difficulty and processing cost.

[0066] As one of the application examples, as shown in Figure 1 , Figure 2 The first motor housing 2 is provided with an oil cooler 23, which is arranged at the front side of the first motor housing 2 and located above the axis of the first motor after installation.

[0067] In some embodiments, as shown in Figure 2 The main housing 21 is provided with an upper extension rib 211, and the oil cooler 23 is installed on the upper extension rib 211 by bolts or other fasteners.

[0068] In the embodiment, the oil cooler 23 can facilitate cooling of the internal cooling oil of the electric drive system; and by arranging the oil cooler 23 at the front side of the first motor housing 2 and at the position above the axis of the first motor after installation, the clamping space formed at the upper front side between the first motor and the intermediate housing 1 can be better utilized to further improve the overall integration.

[0069] As one of the application examples, as shown in Figure 2As shown, the first motor housing 2 is provided with an oil pump 24, which is arranged on the front side of the first motor housing 2 and below the axis of the first motor after installation.

[0070] In some embodiments, the main housing 21 is provided with a lower extension rib 212, and the oil pump 24 is located below the lower extension rib 212. An output shaft connecting part 213 is arranged between the upper extension rib 211 and the lower extension rib 212, and power can be output through the output shaft connecting part 213.

[0071] In the embodiment, the oil pump 24 can facilitate the internal circulation of the cooling oil in the electric drive system. By arranging the oil pump 24 on the front side of the first motor housing 2 and below the axis of the first motor after installation, the space formed by the first motor and the intermediate housing 1 on the lower part of the front side can be better utilized to further improve the integration.

[0072] As one of the application examples, the double-motor electric drive housing is provided with an oil filling hole 25 and an oil discharge hole 26, and the position height of the oil filling hole 25 is higher than that of the oil discharge hole 26.

[0073] In some embodiments, the oil filling hole 25 is arranged on the front side of the double-motor electric drive housing. At this time, the oil filling hole 25 can be arranged on the intermediate housing 1 or the main housing 21 of the first motor housing 2, as shown in Figure 6 .

[0074] In some embodiments, the position height of the oil filling hole 25 is set to be higher than the oil level height of the difference subtraction assembly. At this time, arranging the oil filling hole 25 on the front side can facilitate the oil filling equipment to directly extend in for oil filling, and also can serve as an observation hole to facilitate the after-sales or maintenance personnel to observe whether the electric drive oil quantity meets the requirements.

[0075] In some embodiments, the oil discharge hole 26 is arranged on the side of the double-motor electric drive housing. At this time, the oil discharge hole 26 can be arranged on the intermediate housing 1 or the main housing 21 of the first motor housing 2, as shown in Figure 8 . The position height of the oil discharge hole 26 is arranged at the low position of the double-motor electric drive housing to facilitate the oil discharge operation through the oil discharge hole 26.

[0076] As one of the application examples, the top of the first motor housing 2 is inclined and provided with a ventilation hole 27;

[0077] The air vent 27 is in communication with the interior of the first motor housing 2 at one end and is provided with an air vent valve 271 at the other end.

[0078] In some embodiments, the air vent 27 is an integral structure with the first motor housing 2, for example, by drilling or casting.

[0079] In the embodiment, the air vent 27 is arranged to facilitate cooperation with the air vent valve 271, so as to realize the communication between the inside of the electric drive housing and the outside by controlling the operation of the air vent valve 271. The air vent 27 is arranged in an inclined manner, which can reduce or even avoid the splashing of oil inside the housing, and also reduce the Z-direction space occupation of the housing as a whole, so that the structure layout can be more reasonable.

[0080] As one of the application examples, an extension pipe section 272 is arranged between the air vent 27 and the air vent valve 271, and the extension pipe section 272 is an elastic pipe section.

[0081] In some embodiments, the extension pipe section 272 is made of rubber material, for example, a hose or an organ pipe.

[0082] In the embodiment, the extension pipe section 272 is arranged to facilitate the extension of the relative distance between the air vent valve 271 and the air vent 27, so as to further reduce the possibility of oil splashing.

[0083] As one of the application examples, the double-motor electric drive housing is provided with a plurality of mounting holes 6, and based on the arrangement position of the mounting holes 6, a top contact surface 60 is formed outside the mounting holes 6.

[0084] In some embodiments, a first mounting hole 61 is arranged on the first housing 22, and the direction of the first mounting hole 61 is parallel to the axis of the first motor. Since the first housing 22 is an independent component, the first mounting hole 61 can be machined or integrally formed on the first housing 22, and at this time, the top contact surface 60 based on the first mounting hole 61 is arranged on the outer side surface of the first housing 22, as shown in Figure 8 .

[0085] In some embodiments, the top contact surface 60 on the first housing 22 is provided with a plurality of weight-reducing grooves 601 in the middle, as shown in Figure 8 .

[0086] In some embodiments, a first hanging piece 31 is arranged outside the second motor housing 3, and a second hanging mounting hole 62 is arranged on the first hanging piece 31, and the direction of the second hanging mounting hole 62 is parallel to the axis of the second motor; wherein the first hanging piece 31 is detachably arranged on the second motor housing 3 by means of a fastener such as a bolt, at this time, the first hanging piece 31 is an independent component, so as to facilitate the design of the structural strength of the first hanging piece 31, so that the first outer shell 22 and the first hanging piece 31 can be used as the protective structure of the two ends of the double-motor electric drive housing, respectively.

[0087] In some embodiments, based on the shape of the top contact surface 60 formed by the second hanging mounting hole 62, the shape of the top contact surface 60 on the first outer shell 22 can be similar, such as both being arranged in a circular pie shape, as shown in Figure 7 , Figure 8

[0088] In some embodiments, a plurality of second hanging pieces 7 are arranged on the front side of the double-motor electric drive housing, and a third hanging mounting hole 63 is arranged on the second hanging piece 7, and the third hanging mounting hole 63 is arranged towards the front side of the double-motor electric drive housing, as shown in Figure 6

[0089] In some embodiments, the second hanging piece 7 is also arranged as an independent component, so that the controllability of the structural strength of the second hanging piece 7 is higher, and the second hanging piece 7 is arranged on the front side of the double-motor electric drive housing by means of a fastener such as a bolt.

[0090] In some embodiments, the second hanging piece 7 is arranged in two, and the structures of the two second hanging pieces 7 are consistent, and are respectively arranged on the side of the intermediate housing 1 and the side of the first motor housing 2, at this time, the front side of the second hanging piece 7 is used as the top contact surface 60.

[0091] In the embodiment, the hanging mounting hole 6 can facilitate the suspension mounting of the entire electric drive housing on the vehicle body, and the top contact surface 60 can increase the top contact area between the electric drive housing and the vehicle body, reduce the influence of long-term vibration conditions, and effectively improve the structural strength of the component where the top contact surface 60 is located, facilitating lightweight design.

[0092] In addition, the embodiment also provides an electric drive system, which comprises a differential assembly, a first motor, a second motor, and a double-motor electric drive housing as described above;

[0093] ​​The differential assembly is mounted in the intermediate housing 1, the first motor is mounted in the first motor housing 2, and is connected with the differential assembly through the mounting between the first motor housing 2 and the intermediate housing 1; the second motor is mounted in the second motor housing 3, and is connected with the differential assembly through the mounting between the second motor housing 3 and the intermediate housing 1.

[0094] The first motor and the second motor are electrically connected with the electric drive controller 5, so as to control the operation of the first motor and the second motor through the electric drive controller 5.

[0095] Compared with the prior art, the embodiment has at least the following beneficial effects:

[0096] In the embodiment, the first motor housing 2 and the second motor housing 3 are arranged in a staggered manner to form the avoiding space 4, and the electric drive controller 5 is arranged in the avoiding space 4, so that the structure of the double-motor electric drive housing can be more compact, small in size, high in integration, and convenient for improving the space utilization and realizing lightweight design.

[0097] The above is only a specific implementation of the present application, and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall also be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

[0098] It should be noted that, in this document, the relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

Claims

1. A dual-motor electric drive housing, characterized in that, The application relates to a double-motor electric drive shell. The double-motor electric drive shell comprises a middle shell for mounting a differential assembly; a first motor shell for mounting a first motor, the first motor shell being arranged on one side of the middle shell, the top of the first motor shell being obliquely provided with a ventilation channel, one end of the ventilation channel being communicated with the inside of the first motor shell, the other end of the ventilation channel being provided with a ventilation valve, an extension pipe section being arranged between the ventilation channel and the ventilation valve, the extension pipe section being an elastic pipe section; and a second motor shell for mounting a second motor, the second motor shell being arranged on the other side of the middle shell; the volume of the first motor shell is greater than that of the second motor shell, and the axis of the second motor after installation is lower than that of the first motor, and the top of the first motor shell is higher than that of the second motor shell to form an avoiding space; and an electric drive controller is arranged in the avoiding space. The middle shell is provided with a gear shifting mechanism, the gear shifting mechanism comprising a gear shifting mechanism shell and an output part. The gear shifting mechanism shell is arranged between the first motor shell and the second motor shell and located at the rear side of the electric drive controller. The output part extends into the middle shell and is in transmission connection with the differential assembly.

2. The dual-motor electric drive housing of claim 1, wherein, The first motor shell is provided with an oil cooler, the oil cooler being arranged on the front side of the first motor shell and located above the axis of the first motor after installation. The first motor shell is provided with an oil pump, the oil pump being arranged on the front side of the first motor shell and located below the axis of the first motor after installation. The double-motor electric drive shell is provided with an oil filling hole and an oil discharging hole, the position height of the oil filling hole being higher than that of the oil discharging hole.

3. The dual-motor electric drive housing of claim 1 or 2, wherein, The oil filling hole is arranged on the front side of the middle shell or the first motor shell, and the oil discharging hole is arranged on the side of the middle shell or the first motor shell.

4. The dual-motor electric drive housing of claim 3, wherein, The double-motor electric drive shell is provided with a plurality of hanging installation holes, the outer side of the hanging installation hole being formed with a top contact surface.

5. The dual-motor electric drive housing of claim 4, wherein, The first motor shell comprises a first outer shell, the first outer shell being provided with a first hanging installation hole, the direction of the first hanging installation hole being parallel to the axis of the first motor. The outer side of the second motor shell is provided with a first hanging piece, the first hanging piece being provided with a second hanging installation hole, the direction of the second hanging installation hole being parallel to the axis of the second motor.

6. The dual-motor electric drive housing of any one of claims 1, 2, 5, wherein, The front side of the double-motor electric drive shell is provided with a plurality of second hanging pieces, the second hanging pieces being provided with third hanging installation holes.

7. The dual-motor electric drive housing of claim 6, wherein, The double-motor electric drive shell comprises a differential assembly, a first motor, a second motor and the double-motor electric drive shell in any one of claims 1-7. The differential assembly is mounted on the middle shell, the first motor is mounted on the first motor shell and in transmission connection with the differential assembly, and the second motor is mounted on the second motor shell and in transmission connection with the differential assembly. The first motor, the second motor and the electric drive controller are electrically connected.

8. An electric drive system characterized by, ​ ​ ​

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