Electric drive axle assembly

Abstract

The present invention discloses an electric drive axle assembly, including a housing component and a connecting component; the housing component includes a first housing, a second housing, and a third housing disposed between the first housing and the second housing, and the second housing and the second housing are both provided with a connecting opening on one side away from the third housing; the connecting component includes a connecting shaft, a first connecting member and a second connecting member disposed at both ends of the connecting shaft, the connecting shaft passes through the first housing, the second housing, and the third housing, the first connecting member is disposed in the connecting opening on the first housing, the second connecting member is disposed in the connecting opening on the second housing, and the first connecting member and the second connecting member are both used to connect the cross bridge components on both sides of the housing component. The present invention connects the first housing, the second housing, and the third housing coaxially, and arranges the connecting shaft horizontally therein, so that when the motor rotates, the rotating components in the first housing, the second housing, and the third housing are in the same axis horizontal position, so as to avoid affecting the smoothness of the drive axle.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to an electric drive axle assembly. Background Art

[0002] The drive axle is a mechanism located at the end of the transmission system that can change the speed and torque from the transmission and transmit them to the drive wheels. The drive axle is generally composed of a main reducer, a differential, a wheel transmission device and a drive axle housing, and the steering drive axle also has a constant velocity joint. In addition, the drive axle must also withstand the vertical force, longitudinal force and lateral force acting between the road surface and the frame or body, as well as the braking torque and reaction force.

[0003] At present, the solutions adopted by the integrated electric drive axles used in large quantities in the market are mostly non-coaxial arrangements of the drive motor and the drive axle housing. There is a solution that directly connects the output flange of the drive motor to the main gear flange of the traditional bevel gear drive axle, and the drive motor and the drive axle housing are arranged vertically. There is also a solution that changes the traditional bevel gear meshing to cylindrical helical gear meshing, the drive motor output flange is connected to the small cylindrical helical gear, and the drive motor and the drive axle housing are arranged in parallel.

[0004] However, both of these arrangements will cause a certain deviation between the center of gravity of the drive motor and the axis of the bridge housing. In addition, in order to avoid motion interference, the drive motor cannot be fixed to the frame, so that the drive motor actually works in a cantilever beam state. The bridge housing is constantly subjected to excess torque from the drive motor, causing torsional fatigue failure of the bridge housing and affecting the smoothness index of the entire vehicle. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an electric drive axle assembly, which aims to solve the problem that the current drive motor and the drive axle housing are not coaxially arranged, resulting in a certain deviation between the center of gravity of the drive motor and the axis of the axle housing, which in turn causes torsional fatigue failure of the axle housing and affects the smoothness index of the entire vehicle.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions: an electric drive axle assembly, including a housing component and a connecting component arranged inside the housing component;

[0007] The housing assembly comprises a first shell, a second shell, and a third shell disposed coaxially between the first shell and the second shell, wherein a connection opening is disposed on a side of the first shell and the second shell away from the third shell;

[0008] The connecting component includes a connecting shaft, a first connecting member and a second connecting member respectively arranged at both ends of the connecting shaft, the connecting shaft passes through the first shell, the second shell and the third shell, the end of the first connecting member away from the connecting shaft is also arranged in a first connecting opening on the first shell, and the end of the second connecting member away from the connecting shaft is also arranged in a first connecting opening on the second shell, and the first connecting member and the second connecting member are both used to connect the cross-bridge components on both sides of the outer shell component.

[0009] In summary, according to an electric drive axle assembly provided by the present invention, by connecting the first housing, the second housing and the third housing coaxially, and making the connecting shaft horizontally arranged therein, when the motor rotates, the rotating components in the first housing, the second housing and the third housing are in the same axis horizontal position, avoiding affecting the smoothness of the drive axle. Specifically, the electric drive axle assembly in the present invention includes a housing assembly and a connecting assembly arranged inside the housing assembly. The housing assembly includes a first housing, a second housing, and a third housing arranged between the first housing and the second housing, and the first housing, the second housing and the third housing are surrounded by a housing space for accommodating parts such as a transmission, an intermediate shaft and a motor. The connecting assembly includes a connecting shaft, a first connecting member and a second connecting member arranged at both ends of the connecting shaft, and the connecting shaft passes through the first housing, the second housing and the third housing, and is horizontally arranged inside the housing assembly, so that parts such as a transmission and a motor are arranged in the accommodation space around the connecting shaft. Compared with the non-coaxial arrangement scheme, the electric drive axle assembly improves the smoothness of the drive axle and reduces the torque borne by the axle housing. The first connecting member is arranged in a connecting opening on the first shell, and the second connecting member is arranged in a connecting opening on the second shell. The first connecting member and the second connecting member are both used to connect the cross-bridge assemblies on both sides of the outer shell assembly. The first connecting member and the second connecting member are connected to the cross-bridge assemblies through the connecting members, and there is no need to set a flange connection, which simplifies the connection structure, improves reliability, and reduces the risk of oil leakage.

[0010] Furthermore, one end of the first connecting member abuts against the bottom of the first connecting opening, and the other end is aligned with the edge of the first connecting opening on the first shell. The circumferential surface of the first connecting member is also provided with a plurality of grooves clamped on the inner wall of the first connecting opening.

[0011] Furthermore, a first mounting groove for connecting the cross bridge assembly is provided on the inner periphery of the first connecting member.

[0012] Furthermore, one end of the second connecting member abuts against the end of the connecting shaft, and the other end is aligned with the edge of the first connecting opening of the second shell, and the circumferential surface of the second connecting member is provided with a plurality of grooves that are clamped on the inner wall of the first connecting opening.

[0013] Furthermore, a plurality of second mounting grooves for connecting the cross-bridge assembly are provided on the inner periphery of the second connecting member.

[0014] Furthermore, a motor rotor assembly is provided on the portion of the connecting shaft disposed in the third housing, and a motor stator assembly is provided outside the motor rotor assembly.

[0015] Furthermore, the portion of the connecting shaft disposed in the first housing is provided with a plurality of recesses along the length direction of the connecting shaft to form splines for connecting to a differential.

[0016] Furthermore, an intermediate shaft is provided on one side of the spline, and the intermediate shaft is provided at the connection between the first shell and the third shell.

[0017] Furthermore, a shielding member is provided at one end of the connecting shaft close to the second shell, a transformer is also provided inside the shielding member, and a lead groove for the transformer wiring harness is provided on the shielding member.

[0018] Furthermore, the cross bridge assembly includes a left bridge assembly and a right bridge assembly symmetrically arranged on both sides of the outer shell assembly, and the left bridge assembly and the right bridge assembly both include a bridge tube and a half-axle assembly arranged at one end of the bridge tube.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a structural schematic diagram of the electric drive axle assembly in the first embodiment of the present invention;

[0022] Figure 2 It is a cross-sectional view of the electric drive axle assembly;

[0023] Figure 3 is a schematic diagram of the structure of the housing assembly;

[0024] Figure 4 is a cross-sectional view of a housing assembly;

[0025] Figure 5 is a schematic structural diagram of a first connecting member;

[0026] Figure 6 is a cross-sectional view of the second connecting member;

[0027] Figure 7 is a schematic structural diagram of a second connecting member;

[0028] Figure 8 is a schematic diagram of the structure of the shielding element;

[0029] Fig. 9 It is a schematic diagram of press-fitting the first housing and the left bridge pipe;

[0030] Fig.10 for Fig. 9 The cross-sectional view of the completed pile pressing;

[0031] Fig.11 is a cross-sectional view of the first shell;

[0032] Fig.12 It is a schematic diagram of the press-fit structure of the second housing and the right bridge pipe;

[0033] Fig.13 It is a schematic structural diagram of a connecting shaft in a second embodiment of the present invention;

[0034] Fig.14 for Fig.13 A cross-sectional view of the middle connecting shaft;

[0035] Fig.15 4 is a cross-sectional view of a housing assembly in a second embodiment of the present invention.

[0036] Component symbol description:

[0037] Housing assembly 100, first housing 110, second housing 120, cooling water channel 121, third housing 130, first connecting opening 141, first connecting opening 142, connecting shaft 210, support member 211, spline 220, inner spline 221, outer spline 222, first connecting member 220, second connecting member 230, groove 240, first mounting groove 251, second mounting groove 252, motor rotor assembly 310, motor stator assembly 320, intermediate shaft 400, shielding member 500, lead groove 510, transformer 520, cross bridge assembly 600, left bridge assembly 610, left half shaft 611, left bridge tube 612, right bridge assembly 620, right half shaft 621, right bridge tube 622, press-fitting portion 630, oil seal 700, oil seal mounting surface 710, bearing mounting surface 720, bearing 730, suspension interface 800, differential 900. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] Embodiment 1

[0042] Please combine Figure 1-Figure 12 , which is a schematic structural diagram of an electric drive axle assembly provided in the first embodiment of the present invention, includes a housing component 100 and a connecting component disposed inside the housing component 100, wherein:

[0043] In order to accommodate parts such as a transmission, a motor and an intermediate shaft 400, the housing assembly 100 includes a first housing 110, a second housing 120 and a third housing that are coaxially arranged, and the third housing is arranged between the first housing 110 and the second housing 120. A number of screw holes are arranged on both sides of the third housing 130 along its circumference, and a number of screw holes are arranged along the edges of the ports of the first housing 110 and the second housing 120. The first housing 110 and the second housing 120 are fixed to the third housing 130 by bolts. It is worth noting that the first housing 110 is a transmission end housing, the second housing 120 is a motor end housing, and the third housing 130 is a motor housing.

[0044] Furthermore, a cooling water channel 121 is provided on the motor housing to cool the motor rotor assembly 310 and the motor stator assembly 320 disposed inside the motor housing. At the same time, a connection opening is provided at one end of the first housing 110 and the second housing 120 away from the third housing 130 for connecting the cross bridge assembly 600. In addition, in order to enhance the versatility of the electric drive axle assembly in this application, a suspension interface 800 is provided on one side of the first housing 110 and the second housing 120 away from the third housing 130, and the suspension interface 800 is provided near the connection opening so that it can be connected to the frame through suspension, thereby reducing the burden on the bridge housing.

[0045] Furthermore, the connecting assembly includes a connecting shaft 210, a first connecting member 220 and a second connecting member 230 provided at both ends of the connecting shaft 210, the connecting shaft 210 passes through the first housing 110, the second housing 120 and the third housing 130, and is horizontally provided therein so that the axis of the drive motor and the axis of the bridge housing are coaxially arranged, and both ends of the connecting shaft 210 also abut against the connecting openings on the first housing 110 and the second housing 120. In order to connect with the cross bridge assembly 600, a first connecting member 220 is provided in the first connecting opening 141 of the first housing 110, and a second connecting member 230 is provided in the first connecting opening 142 of the second housing 120. One end of the first connecting member 220 abuts against the bottom of the first connecting opening 141 close to the connecting shaft 210, and the other end is aligned with the edge of the first connecting opening 141 on the first shell 110. In order to fix the first connecting member 220 to the first connecting opening 141 on the first shell 110, a plurality of grooves 240 are provided on the circumferential surface of the first connecting member 220 and are clamped on the inner wall of the connecting opening to prevent the first connecting member 220 from rotating or moving along the length direction of the connecting shaft 210. The grooves 240 may be square or circular, or other shapes with a fixing function.

[0046] Similarly, one end of the second connecting member 230 inside the second shell 120 abuts against the end of the connecting shaft 210, and the other end is aligned with the edge of the first connecting opening 142 of the second shell 120. The circumferential surface of the second connecting member 230 is provided with a plurality of grooves 240 that are clamped on the inner wall of the first connecting opening 142 to prevent the second connecting member 230 from rotating in the second shell 120 or moving along the length direction of the connecting shaft 210. The first connecting member 220 or the second connecting member 230 is integrated with the first shell 110 or the second shell 120 by pre-casting, that is, before the first shell 110 or the second shell 120 is cast, the first connecting member 220 or the second connecting member 230 is pre-placed on the mold, and then cast and integrated into one.

[0047] The motor rotor assembly 310 is also sleeved on the portion of the connecting shaft 210 disposed inside the third housing 130, and a motor stator assembly 320 is disposed outside the motor rotor assembly 310. The motor stator assembly 320 is installed inside the third housing 130 by a shrink-fit process, and the electronic rotor assembly is rotatably supported inside the third housing 130 by a bearing. In addition, a shielding member 500 is also provided at one end of the connecting shaft 210 close to the second connecting member 230, and a support member 211 is provided at one end of the connecting shaft 210 close to the first connecting member 220. The support member 211 is fixed to the third housing 130 by bolts, and the shielding member 500 is fixed to the second housing 120 by bolts, and a rotary transformer 520 is also fixed inside the shielding member 500 by bolts. The stator of the rotary transformer 520 is installed on the inner circumference of the shielding member 500 by means of bolts. A lead groove 510 is opened on the edge of the shielding member 500, and the stator wiring harness of the rotary transformer 520 is led out from the lead groove 510. The shielding member 500 can be used to shield electromagnetic interference and prevent electromagnetic signals from affecting the rotary transformer 520.

[0048] It is worth emphasizing that the portion of the connecting shaft 210 disposed in the first housing 110 is provided with a plurality of recesses along the length direction of the connecting shaft 210 to form a gear-shaped spline 220 for connecting the differential 900. The differential 900 assembly is disposed on the spline 220 so that the differential 900 assembly rotates with the connecting shaft 210. An intermediate shaft 400 is also provided on one side of the spline 220, and the intermediate shaft 400 is disposed at the connection between the first housing 110 and the third housing 130.

[0049] It is worth noting that the cross bridge assembly 600 includes a left bridge assembly 610 and a right bridge assembly 620 symmetrically arranged on both sides of the housing assembly 100. The left bridge assembly 610 includes a left half shaft 611 and a left bridge tube 612, and the right bridge assembly 620 includes a right half shaft 621 and a right bridge tube 622. The left bridge tube 612 and the right bridge tube 622 are respectively fixed to the second connecting member 230 and the first connecting member 220 by press fitting. A first mounting groove 251 for connecting the right bridge tube 622 is provided on the inner wall of the first connecting member 220, and two second mounting grooves 252 for connecting the left bridge tube 612 are provided on the inner wall of the second connecting member 230. Correspondingly, a press-fitting portion 630 is provided on the side of the right bridge tube 622 close to the first connecting member 220 and the side of the left bridge tube 612 close to the second connecting member 230. The diameter of the press-fitting portion 630 is smaller than the diameter of the bridge tube, and the diameter of the bridge tube is slightly larger than the diameter of the connecting opening. Therefore, when the left bridge tube 612 or the right bridge tube 622 is inserted into the second connecting member 230 or the first connecting member 220, the press-fitting portion 630 is interference fit with the mounting groove to fix the left bridge tube 612 and the right bridge tube 622 on the second connecting member 230 and the first connecting member 220.

[0050] In summary, according to an electric drive axle assembly provided by the present invention, by connecting the first housing, the second housing and the third housing coaxially, and making the connecting shaft horizontally arranged therein, when the motor rotates, the rotating components in the first housing, the second housing and the third housing are in the same axis horizontal position, avoiding affecting the smoothness of the drive axle. Specifically, the electric drive axle assembly in the present invention includes a housing assembly and a connecting assembly arranged inside the housing assembly. The housing assembly includes a first housing, a second housing, and a third housing arranged between the first housing and the second housing, and the first housing, the second housing and the third housing are surrounded by a housing space for accommodating parts such as a transmission, an intermediate shaft and a motor. The connecting assembly includes a connecting shaft, a first connecting member and a second connecting member arranged at both ends of the connecting shaft, and the connecting shaft passes through the first housing, the second housing and the third housing, and is horizontally arranged inside the housing assembly, so that parts such as a transmission and a motor are arranged in the accommodation space around the connecting shaft. Compared with the non-coaxial arrangement scheme, the electric drive axle assembly improves the smoothness of the drive axle and reduces the torque borne by the axle housing. The first connecting member is arranged in a connecting opening on the first shell, and the second connecting member is arranged in a connecting opening on the second shell. The first connecting member and the second connecting member are both used to connect the cross-bridge assemblies on both sides of the outer shell assembly. The first connecting member and the second connecting member are connected to the cross-bridge assemblies through the connecting members, and there is no need to set a flange connection, which simplifies the connection structure, improves reliability, and reduces the risk of oil leakage.

[0051] Embodiment 2

[0052] Please combine Figure 13-Figure 15 , which is a schematic diagram of the structure of another electric drive axle assembly provided in the second embodiment of the present invention, the difference between the connecting shaft 210 in this embodiment and the connecting shaft 210 in the first embodiment is that a cylindrical oil seal mounting surface 710 is provided at one end of the connecting shaft 210 away from the first connecting member 220, and a bearing mounting surface 720 is provided between the oil seal mounting surface 710 and the connecting shaft 210 body. An outer spline 222 is provided on the outer circumference of one end of the connecting shaft 210 close to the first housing 110, and an inner spline 221 is provided on the inner circumference of one end close to the second housing 120. One end of the connecting shaft with the outer spline 222 is installed on the half-shaft gear spline of the differential 900, and one end of the connecting shaft 210 with the inner spline 221 passes through the second housing 120 and enters the connecting opening inside the second housing 120, and the connecting shaft is installed on the shielding member 500 by means of a bearing 730.

[0053] In addition, oil seals 700 are provided at the edges of the connection openings of the first shell 110 and the second shell 120 , and the outer ring of the oil seal 700 is fixed at the connection opening, thereby reducing the risk of oil leakage.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electric drive axle assembly, characterized in that: It comprises a housing component and a connection component arranged inside the housing component; The housing assembly comprises a first housing, a second housing, and a third housing disposed coaxially therebetween, wherein the first housing is a transmission end housing, the second housing is a motor end housing, and the third housing is a motor housing, and a connection opening is disposed on a side of the first housing and the second housing away from the third housing; The connecting assembly comprises a connecting shaft, a first connecting member and a second connecting member respectively arranged at two ends of the connecting shaft, the connecting shaft passes through the first shell, the second shell and the third shell, one end of the connecting shaft is arranged in the connecting opening of the first shell, and the other end enters the connecting opening of the second shell, the first connecting member is arranged in the connecting opening on the first shell, and the second connecting member is arranged in the connecting opening on the second shell, and the first connecting member and the second connecting member are both used to connect the cross bridge components on both sides of the housing assembly; One end of the first connecting member is arranged at the bottom of the connecting opening on the first shell, and the other end is aligned with the edge of the connecting opening on the first shell, a plurality of grooves are arranged on the circumferential surface of the first connecting member, which are clamped on the inner wall of the connecting opening of the first shell, and a first mounting groove for connecting the cross bridge assembly is arranged on the inner circumference of the first connecting member; One end of the second connecting member is aligned with the edge of the connecting opening of the second shell, a plurality of grooves are provided on the circumferential surface of the second connecting member to be clamped on the inner wall of the connecting opening of the second shell, and two second mounting grooves for connecting the cross bridge assembly are provided on the inner circumference of the second connecting member; A motor rotor assembly is provided on the portion of the connecting shaft disposed in the third housing, and a motor stator assembly is provided outside the motor rotor assembly; A cylindrical oil seal mounting surface is provided at one end of the connecting shaft away from the first connecting member, a bearing mounting surface is provided between the oil seal mounting surface and the connecting shaft body, and an inner spline is provided on the inner periphery of one end of the connecting shaft close to the second housing; The portion of the connecting shaft disposed in the first housing is provided with a plurality of recessed portions along the length direction of the connecting shaft to form an external spline for connecting to the differential, one end of the connecting shaft provided with the external spline is mounted on the spline of the axle gear of the differential, and one end of the connecting shaft provided with the internal spline passes through the second housing and enters into the connecting opening inside the second housing, an intermediate shaft is also provided on one side of the external spline, and the intermediate shaft is provided at the connection between the first housing and the third housing; A shielding member is provided at one end of the connecting shaft close to the second housing, a transformer is also provided inside the shielding member, a lead groove for the transformer wiring harness is provided on the shielding member, and the connecting shaft is mounted on the shielding member by means of a bearing; The cross-bridge assembly includes a left bridge assembly and a right bridge assembly symmetrically arranged on both sides of the outer shell assembly. The left bridge assembly and the right bridge assembly both include a bridge tube and a half-axle assembly arranged at one end of the bridge tube. A press-fitting portion is provided on the side of the bridge tube of the right bridge assembly close to the first connecting member and on the side of the bridge tube of the left bridge assembly close to the second connecting member. The diameter of the press-fitting portion is smaller than the diameter of the bridge tube, and the diameter of the bridge tube is slightly larger than the diameter of the connecting opening. The press-fitting portion has an interference fit with the mounting groove of the first connecting member and the mounting groove of the second connecting member.

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