A dual-motor electric drive axle assembly

Abstract

The present invention relates to a dual-motor electric drive bridge assembly, comprising a bridge housing, a gearbox housing assembly, and a fixing member; the bridge housing is provided with a through installation channel, the installation channel being perpendicular to the axial direction of the bridge housing, and the two end faces of the installation channel are provided with a first end face and a second end face, the two being arranged in parallel; the gearbox housing assembly comprises a first housing portion, a second housing portion, and an end cover; the first housing portion and the second housing portion are arranged opposite to each other and abutted and fixed, and after the two are connected, they are inserted into the installation channel; the first housing portion is provided with a first sealing surface on the side facing the first end face, the first sealing surface abutting and matching the first end face, the second housing portion is provided with a second sealing surface in the same direction as the second end face, the second sealing surface and the second end face being coplanar, the end cover covers the second sealing surface and the second end face, and is connected and fixed by a fixing member. Compared with the prior art, the present invention can simultaneously take into account the housing strength, sealing performance, and dimensional accuracy, and solves the problem that the dual sealing surfaces cannot simultaneously ensure positioning accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle power systems, and in particular to a dual-motor electric drive axle assembly. Background Art

[0002] An electric drive axle is a drive axle that integrates key components such as an electric motor and a speed reducer. In new energy vehicles, especially electric vehicles, the electric drive axle is a crucial component, responsible for converting the power generated by the electric motor through the speed reducer into torque suitable for the wheel speed, thereby driving the wheels.

[0003] The axle housing is the base upon which the final drive, differential, axle shafts, and wheel assemblies are mounted. Its primary function is to support and protect these components. Generally speaking, the axle housing of a conventional non-disconnecting drive axle is a rigid hollow beam supported by the left and right drive wheels. The final drive, differential, axle shafts, and other transmission components are housed within it. The axle housing is connected to the vehicle frame or body via longitudinal leaf springs. Layout and axle housing design are key technical considerations in the design of an electric drive axle.

[0004] At present, most electric drive axles used in heavy-duty commercial vehicles adopt three-section axle housings and integral axle housings. Among them, the integral axle housing has strong load-bearing capacity and good sealing effect, and has become the mainstream structural form of electric drive axles of various manufacturers.

[0005] The motor of a single-motor integral-bridge-housing electric drive axle can only be arranged on one side, resulting in an offset center of gravity of the electric drive axle. The dual-motor integral-bridge-housing electric drive axle can arrange the two motors symmetrically along the drive shaft, so the center of gravity of the electric drive axle can basically coincide with the center line of the drive shaft, providing better stress conditions.

[0006] In some existing dual-motor electric drive axle assembly solutions, the two motors are connected to the axle housing of the electric drive axle through the left and right half shells respectively. However, the dimensional accuracy and assembly accuracy of the left and right half shells and the axle housing will directly affect the meshing accuracy of the gears. The electric drive axle with this structure often generates relatively large noise, and the shell strength is difficult to guarantee. Summary of the Invention

[0007] The present invention discloses a dual-motor electric drive axle assembly, aiming to solve the technical problems existing in the prior art.

[0008] The present invention adopts the following technical solutions:

[0009] An embodiment of the present invention provides a dual-motor electric drive axle assembly, comprising an axle housing, a gearbox housing assembly, and fixings;

[0010] The axle housing is provided with a through installation channel, the installation channel is perpendicular to the axial direction of the axle housing, and the two ends of the installation channel are provided with a first end surface and a second end surface, which are arranged in parallel;

[0011] The gearbox housing assembly includes a first housing portion, a second housing portion and an end cover; the first housing portion and the second housing portion are arranged opposite to each other and abutted and fixed, and the two are connected and passed through the installation channel; the first housing portion is provided with a first sealing surface on the side facing the first end face, and the first sealing surface abuts and matches the first end face, and the second housing portion is provided with a second sealing surface in the same direction as the second end face, and the second sealing surface is coplanar with the second end face, and the end cover covers the second sealing surface and the second end face, and is connected and fixed by a fixing member.

[0012] As a preferred technical solution, the gearbox housing assembly also includes a first connecting member, a plurality of first mounting grooves are provided at one end of the first housing portion facing the second housing portion, the second housing portion is provided with a second mounting groove, the second mounting groove is communicated with the first mounting groove, and the first connecting member passes through the second mounting groove and is arranged in the first mounting groove.

[0013] As a preferred technical solution, the first mounting groove and the second mounting groove are both threaded grooves, the first connecting member includes a plurality of long bolts, and the end of the first connecting member abuts against the second shell portion.

[0014] As a preferred technical solution, the gearbox housing assembly also includes a second connecting member, the first sealing surface is provided with several through third mounting grooves, the first end surface is provided with several fourth mounting grooves, and the second connecting member passes through the third mounting grooves and is fixed in the fourth mounting grooves.

[0015] As a preferred technical solution, the third mounting groove and the fourth mounting groove are both threaded grooves, the second connecting member includes a plurality of short bolts, and the end of the second connecting member abuts against the first shell portion.

[0016] As a preferred technical solution, a sealing member is provided between the first end face and the first sealing surface, and between the second end face and the second sealing surface.

[0017] As a preferred technical solution, the sealing member includes one or more combinations of a sealing ring, a sealing gasket and a sealant.

[0018] As a preferred technical solution, the fixing member includes several bolts, and the end cover, the second sealing surface and the second end surface are provided with bolt holes matching the fixing member. The fixing member passes through the end cover and is fixed in the bolt hole, and the end of the fixing member abuts against the end cover.

[0019] As a preferred technical solution, a first mating surface is provided on the inner side of the installation channel, and a second mating surface is provided at the connection between the first shell portion and the second shell portion, and the second mating surface matches the first mating surface.

[0020] As a preferred technical solution, the dual-motor electric drive axle assembly further includes a reduction mechanism, a differential mechanism, a shift mechanism, a brake assembly and two drive motors.

[0021] One embodiment of the above invention has the following advantages or beneficial effects:

[0022] The present invention mainly provides a dual-motor electric drive axle assembly, which is suitable for pure electric drive heavy-duty commercial trucks. Since the left and right gearbox housings are not directly connected in the prior art, the gear center distance and center line parallelism cannot be guaranteed. Compared with the prior art, the embodiment of the present invention improves the accuracy of the existing structure by changing the connection method between the gearbox housing and the bridge housing to a pull-out design, and can simultaneously take into account the housing strength, sealing performance and dimensional accuracy, improve the noise problem and housing accuracy of the dual-motor symmetrically arranged electric drive axle, significantly improve the diversity of the connection form between the reducer housing and the bridge housing, and solve the problem that the dual sealing surfaces cannot simultaneously ensure positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of the structure of a dual-motor electric drive axle assembly provided by one embodiment of the present invention;

[0025] Figure 2 An exploded structural diagram of a dual-motor electric drive axle assembly provided by one embodiment of the present invention;

[0026] Figure 3 — Figure 6 A diagram showing the processing steps for the housing portion of a dual-motor electric drive axle assembly provided in accordance with one embodiment of the present invention.

[0027] Description of reference numerals:

[0028] Axle housing 10, mounting channel 11, first end face 12, second end face 13, transmission housing assembly 20, first housing portion 21, first sealing surface 211, first mounting groove 212, bearing hole 213, pin hole 214, third mounting groove 215, second housing portion 22, second sealing surface 221, second mounting groove 222, end cover 23, first connecting member 24, second connecting member 25, fixing member 30. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0030] In the description of the present application, the terms "first", "second", etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

[0031] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In one embodiment of the present invention, the housing portion of the dual-motor electric drive axle assembly includes a bridge housing 10, a transmission housing assembly 20 and a fixing part 30. The power portion of the dual-motor electric drive axle assembly includes a reduction mechanism, a differential mechanism, a shift mechanism, a brake assembly, a shaft head and two drive motors. The embodiment of the present invention mainly improves the housing portion. The structure of the power portion can adopt any embodiment disclosed in the prior art, so the specific structure of the power portion will not be repeated.

[0033] In a preferred embodiment, the two drive motors, the reduction mechanism, the differential mechanism, and the shift mechanism are all encapsulated in the housing part, and the reduction mechanism includes a planetary gear set; the shaft head, the brake assembly and other accessories are arranged at both axial ends of the housing part, and the shaft head is used to output power to the wheel hub.

[0034] refer to Figure 1 、 Figure 2 In a preferred embodiment, the housing portion of the dual-motor electric drive axle assembly includes a bridge housing 10 , a transmission housing assembly 20 and a fixing part 30 .

[0035] Preferably, the axial ends of the bridge housing 10 are connected to the shaft heads, brake assemblies and other accessories, and a through mounting channel 11 is provided in the middle of the bridge housing 10. The through direction of the mounting channel 11 is perpendicular to the axial direction of the bridge housing 10. The two ends of the mounting channel 11 have a first end face 12 and a second end face 13. The first end face 12 and the second end face 13 are both rectangular ring-shaped, and the two are arranged in parallel and parallel to the axial direction of the bridge housing 10. The circumferential inner side surface of the mounting channel 11 is the first mating surface.

[0036] Preferably, the transmission housing assembly 20 includes a first housing portion 21, a second housing portion 22 and an end cover 23. A drive motor is installed in each of the first housing portion 21 and the second housing portion 22. The two are arranged relative to each other and fixed in abutment with each other. The reduction mechanism, differential mechanism, shift mechanism, etc. are arranged between the two. A second mating surface is provided on the circumferential outer side of the connection between the first housing portion 21 and the second housing portion 22. After the two are connected, they are pulled through the installation channel 11. The second mating surface matches the first mating surface. The second housing can be connected and fixed to the bridge housing 10 through the end cover 23 and the fixing member 30.

[0037] Specifically, the first housing portion 21 is provided with a first sealing surface 211 on the side facing the first end face 12. The first sealing surface 211 is arranged parallel to the first end face 12 and has the same shape. When the first housing portion 21 and the second housing portion 22 are connected and pushed into the installation channel 11, the first sealing surface 211 and the first end face 12 abut against each other; the second housing portion 22 is provided with a second sealing surface 221 which is in the same direction as the second end face 13. When the first housing portion 21 and the second housing portion 22 are connected and pushed into the installation channel 11, the second sealing surface 221 and the second end face 13 are coplanar. The shape of the end cover 23 matches the shape of the second sealing surface 221 and the second end face 13, and is roughly rectangular. The end cover 23 can cover the second sealing surface 221 and the second end face 13 in parallel, and is connected and fixed by a fixing member 30.

[0038] In a preferred embodiment, sealing members are provided between the first end face 12 and the first sealing surface 211 and between the second end face 13 and the second sealing surface 221. The sealing members can be one or more combinations of sealing rings, sealing pads and sealants.

[0039] In a preferred embodiment, the transmission housing assembly 20 also includes a first connecting member 24 and a second connecting member 25. The first housing portion 21 is provided with several first mounting grooves 212 at one end facing the second housing portion 22, and the second housing portion 22 is provided with several second mounting grooves 222. The second mounting grooves 222 match the first mounting grooves 212 one by one, and each second mounting groove 222 is connected to the adjacent first mounting groove 212. The first connecting member 24 is fixed in the first mounting groove 212 through the second mounting groove 222; the first sealing surface 211 is provided with several through third mounting grooves 215, and the first end face 12 is provided with several fourth mounting grooves (not shown in the figure), the fourth mounting grooves match the third mounting grooves 215 one by one, and each fourth mounting groove is connected to the adjacent third mounting groove 215, and the second connecting member 25 is fixed in the fourth mounting groove through the third mounting groove 215.

[0040] Specifically, the first mounting groove 212 and the second mounting groove 222 are both threaded grooves, and the first connecting member 24 is configured as several long bolts. After the first connecting member 24 penetrates into the second mounting groove 222 and the first mounting groove 212, its end portion abuts against the second shell portion 22.

[0041] Specifically, the third mounting groove 215 and the fourth mounting groove are both threaded grooves, and the second connecting member 25 is configured as a plurality of short bolts. After the second connecting member 25 passes through the third mounting groove 215 and the fourth mounting groove, its end portion abuts against the first shell portion 21 .

[0042] In a preferred embodiment, a plurality of communicating pin holes 214 are further provided on the first end surface 12 and the first sealing surface 211 for inserting pins for positioning.

[0043] Preferably, the fixing member 30 includes several bolts, and bolt holes matching the fixing member 30 are provided on the end cover 23, the second sealing surface 221 and the second end surface 13. The fixing member 30 passes through the end cover 23 and is fixed in the bolt holes, and the end of the fixing member 30 abuts against the end cover 23.

[0044] refer to Figures 3 to 6 In one embodiment of the present invention, a method for processing the housing portion of the dual-motor electric drive axle assembly is also provided, the method comprising the following steps:

[0045] The first housing portion 21 and the second housing portion 22 are cast separately. Both are metal housings, and sufficient machining allowance is left. The method for determining the machining allowance can select any embodiment disclosed in the prior art and is not specifically limited here.

[0046] The bearing holes 213, the first mounting grooves 212 and the second mounting grooves 222 of the first housing portion 21 and the second housing portion 22 are processed respectively, and then the first housing portion 21 and the second housing portion 22 are connected and fixed by the first connecting member 24 to form the gearbox housing assembly 20. Figure 3 ;

[0047] Process the bearing hole 213, and process the first sealing surface 211 and the second sealing surface 221 respectively based on the bearing hole 213, and process the third mounting groove 215, the fourth mounting groove and the pin hole 214. Figure 4 ;

[0048] Push the gearbox housing assembly 20 into the installation channel 11 of the bridge housing 10, and use the pins to radially position it, tighten the second connecting piece 25, and then process the second end face 13 and the second sealing surface 221 to ensure the flatness of the two, and process the bolt holes at the same time. Figure 5 ;

[0049] The end cover 23 is connected to the second end face 13 and the second sealing surface 221 by the fixing member 30, and the assembly of the transmission housing assembly 20 and the bridge housing 10 is completed. Figure 6 Specifically, a sealing member is provided between the first end face 12 and the first sealing surface 211 and between the second end face 13 and the second sealing surface 221. The sealing member can be selected from one or more combinations of sealing rings, sealing gaskets and sealants.

[0050] Compared with the existing technology, the embodiment of the present invention improves the accuracy of the existing structure by changing the connection method between the transmission housing assembly 20 and the bridge housing 10 to a pull-out design, and can take into account the housing strength, sealing performance and dimensional accuracy at the same time, improve the noise problem and housing accuracy of the electric drive bridge with symmetrical arrangement of dual motors, significantly improve the diversity of the connection forms between the reducer housing and the bridge housing 10, and solve the problem that the dual sealing surfaces cannot simultaneously ensure positioning accuracy.

[0051] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0052] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0053] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach of the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0054] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

Claims

1. A dual-motor electric drive axle assembly, characterized in that: Including axle housing, gearbox housing assembly and fixings; The axle housing is provided with a through mounting channel, the mounting channel being perpendicular to the axial direction of the axle housing, and the two ends of the mounting channel are provided with a first end surface and a second end surface, which are arranged in parallel; the circumferential inner side surface of the mounting channel is configured as a first mating surface; The gearbox housing assembly includes a first housing portion, a second housing portion and an end cover; the first housing portion and the second housing portion are arranged opposite to each other and abutted and fixed, and after the two are connected, they are pulled through the installation channel; the first housing portion is provided with a first sealing surface on the side facing the first end face, the first sealing surface abuts and matches with the first end face, the second housing portion is provided with a second sealing surface in the same direction as the second end face, the second sealing surface is coplanar with the second end face, and a sealing member is provided between the first end face and the first sealing surface, and between the second end face and the second sealing surface; the end cover covers the second sealing surface and the second end face, and is connected and fixed by the fixing member; A second mating surface is provided on the circumferential outer side of the connection between the first shell portion and the second shell portion, and the second mating surface matches the first mating surface.

2. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The transmission housing assembly also includes a first connecting member, and the first housing portion is provided with a plurality of first mounting grooves at one end facing the second housing portion, and the second housing portion is provided with a second mounting groove, which is communicated with the first mounting groove, and the first connecting member passes through the second mounting groove and is arranged in the first mounting groove.

3. The dual-motor electric drive axle assembly according to claim 2, characterized in that: The first installation groove and the second installation groove are both threaded grooves, the first connecting member includes a plurality of long bolts, and the end of the first connecting member abuts against the second shell portion.

4. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The transmission housing assembly also includes a second connecting member, the first sealing surface is provided with a plurality of through third mounting grooves, the first end surface is provided with a plurality of fourth mounting grooves, and the second connecting member passes through the third mounting grooves and is fixed in the fourth mounting grooves.

5. The dual-motor electric drive axle assembly according to claim 4, characterized in that: The third mounting groove and the fourth mounting groove are both threaded grooves, the second connecting member includes a plurality of short bolts, and an end portion of the second connecting member abuts against the first shell portion.

6. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The sealing element includes one or more combinations of a sealing ring, a sealing gasket and a sealant.

7. The dual-motor electric drive axle assembly according to claim 1, characterized in that: The fixing member includes several bolts. The end cover, the second sealing surface and the second end surface are provided with bolt holes matching the fixing member. The fixing member passes through the end cover and is fixed in the bolt holes. The end of the fixing member abuts against the end cover.

8. The dual-motor electric drive axle assembly according to any one of claims 1 to 7, characterized in that: It also includes a reduction mechanism, a differential mechanism, a shift mechanism, a brake assembly and two drive motors.

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