Electric drive axle assembly and vehicle

Abstract

The invention discloses an electric drive axle assembly and a vehicle. The electric drive axle assembly comprises an axle housing, a speed reducer box body and a fastening strip, the axle housing is provided with a mounting channel penetrating in the first direction. The speed reducer box body is mounted in the mounting channel along the first direction; the fastening strip is installed outside the speed reducer box body, the fastening strip, the axle housing and the speed reducer box body are connected through a first connecting piece arranged in a penetrating mode in the first direction, and the fastening strip is connected with the speed reducer box body through a second connecting piece arranged in a penetrating mode in the second direction. According to the electric drive axle assembly, the problems that under the alternating load effect, a connecting piece of the axle housing and the speed reducer box body is prone to loosening, and the joint face of the axle housing and the speed reducer box body deviates relatively are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to an electric drive axle assembly and a vehicle. Background Art

[0002] The motor drive axle includes structures such as a speed reducer and a bridge housing. The speed reducer is an important component of the electric drive axle. The torque output by the motor is decelerated and increased in torque by the speed reducer, and then the power is transmitted to the wheels.

[0003] However, in the prior art, the flange interfaces designed for the speed reducer housing and the drive axle housing are connected by bolts. Generally, the maximum deformation of the bridge housing occurs in the middle, and the bolts are distributed in a circle, which easily causes the bolts to loosen or other fastening failures, such as the problem of relative displacement of the joint surface between the bridge housing and the speed reducer, posing a greater safety hazard. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides an electric drive axle assembly, which enhances the connection reliability between the bridge housing and the speed reducer housing under alternating loads, and reduces the problems of easy loosening of the connecting parts and relative displacement of the joint surface between the bridge housing and the speed reducer housing.

[0005] An electric drive axle assembly according to an embodiment of the present invention includes: a bridge housing, a speed reducer housing, and a fastening strip; the bridge housing is provided with an installation channel penetrating along a first direction; the speed reducer housing is installed in the installation channel along the first direction; the fastening strip is installed outside the speed reducer housing, and the fastening strip, the bridge housing, and the speed reducer housing are connected by a first connecting member penetrating along the first direction, and the fastening strip and the speed reducer housing are connected by a second connecting member penetrating along a second direction.

[0006] An electric drive axle assembly according to an embodiment of the present invention can improve the connection reliability between the speed reducer housing and the bridge housing by connecting the fastening strip to the speed reducer housing and the bridge housing in different directions, reduce the risk of loosening of the connection between the speed reducer housing and the drive axle housing, and when the bridge housing deforms, since the bridge housing and the speed reducer housing are connected by the above-mentioned fastening strip, first connecting member, and second connecting member, the problem of loosening of the first connecting member and the second connecting member under alternating loads is reduced, and thus the problem of relative displacement of the joint surface is also reduced.

[0007] In the electric drive axle assembly according to an embodiment of the present invention, the bridge housing includes an installation window, the installation channel is formed in the installation window, an installation flange is formed on the outer peripheral wall of the speed reducer housing, the fastening strip and the installation flange are located on both sides of the installation window, and the first connecting member sequentially passes through the installation flange, the installation window, and the fastening strip.

[0008] For the electric drive axle assembly according to an embodiment of the present invention, the outer periphery of the speed reducer housing includes a first mounting portion arranged circumferentially, and the fastening strip is arranged on the first mounting portion and connected to the first mounting portion through the second connecting member to be connected to the speed reducer housing.

[0009] For the electric drive axle assembly according to an embodiment of the present invention, the fastening strip includes a plurality of first connection holes and second connection holes distributed at intervals. The first connection holes penetrate along a first direction, the second connection holes penetrate along a second direction, and the first connecting member and the second connecting member are multiple. Each first connecting member passes through the corresponding first connection hole and is connected to the axle housing and the speed reducer housing, and each second connecting member passes through the corresponding second connection hole and is connected to the speed reducer housing.

[0010] For the electric drive axle assembly according to an embodiment of the present invention, the fastening strip is provided with grooves and protrusions distributed at intervals along the length direction. The first connection holes are arranged at the protrusions along the first direction, and the second connection holes penetrate through the grooves along the second direction.

[0011] For the electric drive axle assembly according to an embodiment of the present invention, there are multiple fastening strips. Some of the multiple fastening strips are located at the top and bottom of the speed reducer housing, and some of the other fastening strips are located at the side of the speed reducer housing. The multiple fastening strips are all connected to the axle housing and the speed reducer housing along the first direction and are also connected to the speed reducer housing along the second direction.

[0012] For the electric drive axle assembly according to an embodiment of the present invention, the bottom surface shape of the fastening strip matches the shape of the outer surface of the speed reducer housing at the corresponding position.

[0013] For the electric drive axle assembly according to an embodiment of the present invention, the side of the speed reducer housing includes two first inclined surfaces located on both sides of the central axis in the axial direction of the axle housing. Each first inclined surface is provided with at least one fastening strip.

[0014] For the electric drive axle assembly according to an embodiment of the present invention, it further includes a half shaft bushing and a half shaft sleeve. Both ends of the axle housing are provided with housing ends. The speed reducer housing includes a mounting hole. The outer diameter of the half shaft bushing is smaller than the inner diameter of the housing end and penetrates into the mounting hole along the inside of the housing end to be connected to the speed reducer housing. The other end of the half shaft bushing is sleeved with the half shaft sleeve, and the half shaft sleeve is connected to the housing end.

[0015] The electric drive axle assembly according to an embodiment of the present invention, the half shaft sleeve includes a first pipe section and a second pipe section, the outer diameter of the first pipe section is smaller than the outer diameter of the second pipe section, and the inner diameter of the first pipe section is larger than the outer diameter of the half shaft bushing and is sleeved at the end of the half shaft bushing and the outer periphery contacts the inner periphery of the end of the housing, and the second pipe section axially presses against the end of the housing.

[0016] The electric drive axle assembly according to an embodiment of the present invention further includes a first seal and a second seal. First annular grooves and second annular grooves are respectively provided on the outer peripheries at both ends of the half shaft bushing. The first seal is sleeved in the first annular groove, and the second seal is sleeved in the second annular groove. When the half shaft bushing passes through the mounting hole, the first seal presses against the reducer housing and the second seal presses against the half shaft sleeve.

[0017] In the electric drive axle assembly according to an embodiment of the present invention, the half shaft sleeve and the end of the housing are crimped.

[0018] In the electric drive axle assembly according to an embodiment of the present invention, the reducer housing is integrally formed along the first direction, and the reducer housing is detachably connected along the direction parallel to the vehicle half shaft.

[0019] In the electric drive axle assembly according to an embodiment of the present invention, the reducer housings are evenly arranged on both sides of the bridge housing in the first direction.

[0020] In the electric drive axle assembly according to an embodiment of the present invention, a gap is left between the bridge housing and the reducer housing.

[0021] In the electric drive axle assembly according to an embodiment of the present invention, the bridge housing further includes a drain port, and the drain port is adapted to drain water when water in the external environment enters the gap between the bridge housing and the reducer housing.

[0022] The present invention also discloses a vehicle, including the above-mentioned electric drive axle assembly.

[0023] Compared with the prior art, the vehicle can improve the connection reliability between the reducer housing and the bridge housing under alternating loads, reduce system deformation, avoid the meshing of gears from shifting and causing NVH problems, and improve the service life of the electric drive axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic structural diagram of the bridge housing according to an embodiment of the present invention;

[0026] Figure 2It is a schematic structural diagram of the reducer housing according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the electric drive axle assembly according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the fastening strip according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic cross-sectional view of the connection between the axle housing and the reducer housing according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Electric drive axle assembly 100,

[0032] Axle housing 1, mounting window 11, third connection hole 111, drain port 112, mating surface 113, housing end 12, half axle bushing 13, second seal 131, first seal 132, half axle sleeve 14, second pipe section 141, first pipe section 142, second inclined surface 15, mounting channel 16, second connection surface 17, reducer housing 2, mounting flange 21, fourth connection hole 211, first mounting portion 22, fifth connection hole 221, mounting hole 23, first inclined surface 24, first connection surface 25, dual motor 3, fastening strip 4, first connection hole 41, second connection hole 42, groove 43, protrusion 44, first connector 5, second connector 6. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] Unless otherwise specified, the front-back direction in this application is the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction is the transverse direction of the vehicle, i.e., the Y direction; and the up-down direction is the vertical direction of the vehicle, i.e., the Z direction.

[0037] The following refers to Figures 1 - 5 Describe the electric drive axle assembly 100 according to an embodiment of the present invention. The fastening strip 4 is used to connect the reducer housing 2 and the axle housing 1 in different directions, improving the connection reliability between the reducer housing 2 and the axle housing 1 and reducing the problem of easy loosening under alternating loads. And the reducer housing 2 and the dual motors 3 share a housing, enhancing the integrity of the dual motors 3 and the reducer housing 2. At the same time, an integral axle housing 1 is adopted, with fewer parts, a simple structure and good rigidity. There is a gap between the axle housing 1 and the reducer housing 2, and when the axle housing 1 deforms, it is not easy to cause the deformation of the reducer housing 2, having high reliability and reducing NVH problems. There is no need to perform sealing treatment between the axle housing 1 and the reducer housing. Through the sealing between the half-axle bushing 13 and the reducer housing 2 and between the half-axle bushing 13 and the half-axle sleeve 14, the sealing difficulty is reduced and the sealing reliability is increased. The integral axle housing 1 and the reducer housing 2 are assembled by inserting, which is convenient for installation.

[0038] As Figures 1 - 5 shown, the electric drive axle assembly 100 according to an embodiment of the present invention includes: an axle housing 1, a reducer housing 2, and a fastening strip 4.

[0039] Among them, the axle housing 1 is provided with an installation channel 16 penetrating along a first direction; the reducer housing 2 is installed in the installation channel 16 along the first direction, the fastening strip 4 is installed outside the reducer housing 2, and the fastening strip 4, the axle housing 1, and the reducer housing 2 are connected by a first connecting member 5 penetrating along the first direction, and the fastening strip 4 and the reducer housing 2 are connected by a second connecting member 6 penetrating along a second direction.

[0040] In practice, the axle housing 1 is an important structure installed on the vehicle drive axle. Its main function is to support and protect key components such as the main reducer, differential, and half shafts. Connecting the axle housing 1 and the reducer housing 2 can achieve power transmission and protect the internal components of the reducer housing 2. For example, by inserting the reducer housing 2 into the installation channel 16 in the first direction, the axle housing 1 can first support the reducer housing 2 in a plug-in manner between the axle housing 1 and the reducer housing 2, and the plug-in manner of the reducer housing 2 in the first direction with the axle housing 1 makes the preliminary connection between the reducer housing 2 and the axle housing 1 more convenient.

[0041] Furthermore, the length direction of the axle housing 1 is parallel to the vehicle's half shaft, that is, arranged along the Y direction of the vehicle. The first direction is perpendicular to the vehicle's half shaft, that is, inserted into the installation channel 16 along the X direction of the vehicle. The axle housing 1 only bears the Z-direction support force on the reducer housing 2, and the mutual force between the parallel shafts in the reducer housing 2 is borne by the reducer housing 2 itself. The parallel shafts in the reducer housing 2 are in the direction parallel to the vehicle's half shaft. After the plug-in is completed, by using the fastening strip 4 as an intermediate member, the fastening strip 4 is connected to the axle housing 1 and the reducer housing 2 in the first direction through the first connector 5, that is, connected to the axle housing 1 along the direction perpendicular to the vehicle's half shaft. Then, the fastening strip 4 is connected to the reducer housing 2 in the second direction through the second connector 6. The second direction is from the outside of the reducer housing 2 towards the inner center of the reducer housing 2. The second direction can be perpendicular to both the first direction and the direction of the vehicle's half shaft, or the second direction has other included angles with the first direction and the direction of the vehicle's half shaft, which is determined by the included angle relationship between the outer side of the reducer housing 2 and the vehicle's half shaft.

[0042] As Figure 3 shown, assuming that the top surface of the reducer housing 2 is a plane parallel to the horizontal plane, when the second connector 6 passes through the fastening strip 4 perpendicular to the top surface of the reducer housing 2 to connect the reducer housing 2, the second direction is the direction perpendicular to the vehicle's half shaft direction and perpendicular to the first direction.

[0043] It should be noted that the number of the fastening strips 4 can be set to multiple, and they are distributed at intervals along the circumference of the reducer housing 2 and connected to the axle housing 1, so that there are connection positions between the circumference of the reducer housing 2 and the axle housing 1, improving the force uniformity and reliability of the connection between the reducer housing 2 and the axle housing 1. Of course, the number of the fastening strips 4 can also be one, such as a single integral fastening strip 4 surrounding the circumference of the reducer housing 2 and connected to the axle housing 1. However, when the fastening strips 4 are set to multiple, the connection is more convenient, with high flexibility, easy disassembly, and can achieve reliable connection.

[0044] When the axle housing 1 is connected to the reducer housing 2, the fastening strip 4 can first be connected to the axle housing 1 and the reducer housing 2 through the first connecting member 5, and then the second connecting member 6 can pass through the fastening strip 4 and be connected to the reducer housing 2. Or it can also be that the fastening strip 4 is first connected to the reducer housing 2 through the second connecting member 6, and then connected to the axle housing 1 and the reducer housing 2 through the first connecting member 5. By using the fastening strip 4 for connection, the connection reliability between the fastening strip 4 and the reducer housing 2 is enhanced. That is, different positions of the fastening strip 4 are connected to the reducer housing 2 through connecting members in different directions, so that the reducer housing 2 and the axle housing 1 are not only connected in one direction, improving the connection reliability between the axle housing 1 and the reducer housing 2, reducing the risk of loosening in the connection between the reducer housing 2 and the axle housing 1, and thus avoiding problems such as early failure of gears, poor NVH performance, and even failure of the axle housing 1 and the reducer housing 2 resulting in the loss of load-bearing capacity of the axle housing 1.

[0045] In some embodiments, the axle housing 1 includes an installation window 11, an installation channel 16 is formed in the installation window 11, an installation flange 21 is formed on the outer peripheral wall of the reducer housing 2, the fastening strip 4 and the installation flange 21 are located on both sides of the installation window 11, and the first connecting member 5 sequentially passes through the installation flange 21, the installation window 11 and the fastening strip 4.

[0046] In practice, the installation window 11 is provided with a mating surface 113 along a first direction. Refer to Figure 1 As shown, an installation flange 21 is provided on the outer peripheral wall of the reducer housing 2. When the reducer housing 2 is inserted into the installation window 11, first, the inner circumference of the installation window 11 can support the reducer housing 2, and a mating surface 113 of the axle housing 1 is in pressing contact with the installation flange 21 on the outer peripheral wall of the reducer housing 2, thereby determining the mating position between the axle housing 1 and the reducer housing 2. And the fastening strip 4 is in contact with another mating surface 113 of the axle housing 1 along the first direction. The first connecting member 5 passes through the fastening strip 4 along one side of the fastening strip 4 and then passes through a mating surface 113 of the axle housing 1, and further passes through another mating surface 113 of the axle housing 1 and the installation flange 21. The first connecting member 5 can be a bolt, and the bolt fixedly connects the fastening strip 4 to the axle housing 1 and the reducer housing 2 along the first direction.

[0047] Thus, by providing the installation window 11, it can not only form a support with the reducer housing 2, but also enable the reducer housing 2 to be connected through the fastening strip 4, the first connecting member 5 and the second connecting member 6. After the connection between the reducer housing 2 and the axle housing 1, it can also prevent the reducer housing 2 from moving along the first direction and form a reliable connection between the reducer housing 2 and the axle housing 1.

[0048] In some embodiments, the outer periphery of the reducer housing 2 includes a circumferentially arranged first installation portion 22, the fastening strip 4 is arranged on the first installation portion 22 and is connected to the first installation portion 22 through the second connecting member 6 to be connected to the reducer housing 2.

[0049] Among them, the first mounting parts 22 are circumferentially distributed along the reducer housing 2. After the reducer housing 2 is inserted into the mounting window 11 of the axle housing 1, when the mounting flange 21 of the reducer housing 2 abuts against a mating surface 113 of the axle housing 1, the fastening strip 4 is arranged outside the other mating surface 113 of the axle housing 1 and contacts with this mating surface 113. At the same time, the fastening strip 4 is located above the first mounting part 22 and contacts with the first mounting part 22. The fastening strip 4 and the reducer housing 2 are connected along a second direction by a second connecting member 6. The second direction is the direction from the outer fitting surface of the fastening strip 4 and the reducer housing 2 towards the center of the reducer housing 2. The second connecting member 6 can be a bolt. The reliable connection between the fastening strip 4 and the reducer housing 2 is realized through the second connecting member 6, and the reliable connection between the fastening strip 4, the axle housing 1 and the reducer housing 2 is realized through the first connecting member 5, so as to realize the preliminary connection between the reducer housing 2, the axle housing 1 and the reducer housing 2. The fastening strip 4 is connected to the reducer housing 2 along the second direction by the second connecting member 6, so as to realize the reliable connection between the reducer housing 2 and the axle housing 1.

[0050] In some embodiments, the fastening strip 4 includes a plurality of first connection holes 41 and second connection holes 42 which are spaced apart. The first connection holes 41 penetrate along a first direction, the second connection holes 42 penetrate along a second direction, and the first connecting member 5 and the second connecting member 6 are multiple. Each first connecting member 5 passes through the corresponding first connection hole 41 and is connected to the axle housing 1 and the reducer housing 2, and each second connecting member 6 passes through the corresponding second connection hole 42 and is connected to the reducer housing 2.

[0051] Specifically, as shown in Figures 1 - 3 the mounting window 11 is provided with a plurality of third connection holes 111 penetrating along the first direction, the mounting flange 21 is provided with a plurality of fourth connection holes 211 penetrating along the first direction. The plurality of first connection holes 41, the plurality of third connection holes 111 and the plurality of fourth connection holes 211 correspond to each other one by one. Each first connecting member 5 sequentially passes through the corresponding first connection hole 41, third connection hole 111 and fourth connection hole 211 to connect the fastening strip 4 with the mounting window 11 and the reducer housing 2; the first mounting part 22 is provided with a plurality of fifth connection holes 221 arranged along the second direction. The plurality of fifth connection holes 221 and the plurality of second connection holes 42 correspond to each other one by one. Each second connecting member 6 passes through the corresponding second connection hole 42 and fifth connection hole 221 to connect the fastening strip 4 with the reducer housing 2.

[0052] Further, a plurality of first connection holes 41 and a plurality of second connection holes 42 are arranged at intervals. Among them, both the first connection holes 41 and the second connection holes 42 are provided with internal threads, and the first connectors 5 and the second connectors 6 are provided with external threads. The number of the plurality of first connectors 5 corresponds to the number of the plurality of first connection holes 41, and the number of the plurality of second connectors 6 corresponds to the number of the plurality of second connection holes 42. That is, along the length direction of the fastening strip 4, a first connector 5 connects the axle housing 1 and the fastening strip 4 along a corresponding first connection hole 41, and a second connector 6 connects the fastening strip 4 and the reducer housing 2 along a second connection hole 42 adjacent to the first connection hole 41, so as to realize that the plurality of first connectors 5 and the plurality of second connectors 6 are arranged at intervals one by one. That is, the acting force of the first connector 5 on the fastening strip 4, the axle housing 1 and the reducer housing 2 along the first direction is spaced apart from the acting force of the second connector 6 on the fastening strip 4 and the reducer housing 2 along the second direction, so that the fastening strip 4 is in force balance when connecting the axle housing 1 and the reducer housing 2 in different directions, and reliable connection between the fastening strip 4 and the axle housing 1 can be realized, and reliable connection between the fastening strip 4 and the reducer housing 2 can also be realized.

[0053] In some embodiments, the fastening strip 4 is provided with grooves 43 and protrusions 44 distributed at intervals along the length direction. The first connection holes 41 are arranged at the protrusions 44 along the first direction, and the second connection holes 42 penetrate through the grooves 43 along the second direction.

[0054] Refer to Figure 4 As shown, the fastening strip 4 is provided with a plurality of grooves 43 and a plurality of protrusions 44 along the length direction. The protrusions 44 and the grooves 43 are arranged at intervals one by one. The first connection holes 41 penetrating along the first direction are provided at the protrusions 44, and the second connection holes 42 penetrating along the second direction are provided at the grooves 43. That is, when the second connector 6 connects the fastening strip 4 to the reducer housing 2 along the second direction, the end of the second connector 6 can be hidden in the groove 43, so as to keep the surface of the fastening strip 4 flat.

[0055] In addition, that is, the first connector 5 penetrates through the first connection hole 41 at the position of the protrusion 44 to realize the connection between the reducer housing 2 and the axle housing 1 through the fastening strip 4, and the length of the first connector 5 is set to be longer. Setting the first connection hole 41 at the position of the protrusion 44 can enhance the strength and stability of the connection between the fastening strip 4 and the axle housing 1 and the reducer housing 2.

[0056] In some embodiments, there are a plurality of fastening strips 4. Some of the plurality of fastening strips 4 are located at the top and bottom of the reducer housing 2, and some of the other fastening strips 4 are located at the side of the reducer housing 2. The plurality of fastening strips 4 are all connected to the axle housing 1 and the reducer housing 2 along the first direction, and are also connected to the reducer housing 2 along the second direction.

[0057] In practice, the axle housing 1 is constructed as a single body. The installation window 11 of the axle housing 1 can be constructed as a polygon or other shapes. For example, when the installation window 11 is constructed as a polygon, that is, multiple faces of the axle housing 1 are in contact with the periphery of the reducer housing 2. By arranging multiple fastening strips 4 at intervals around the reducer housing 2, the connection between multiple circumferential positions of the reducer housing 2 and the axle housing 1 can be maintained. For example, when the top and bottom of the reducer housing 2 are flat surfaces, one fastening strip 4 connects the axle housing 1 and the reducer housing 2 at the top of the reducer housing 2, and another fastening strip 4 connects the axle housing 1 and the reducer housing 2 at the bottom of the reducer housing 2. At this time, when the fastening strip 4 and the reducer housing 2 are connected along the second direction by the second connecting member 6, the second direction is perpendicular to the first direction and perpendicular to the direction of the vehicle's half shaft.

[0058] And some fastening strips 4 connect the side of the axle housing 1 and the side of the reducer housing 2, that is, multiple fastening strips 4 are distributed on different faces of the reducer housing 2. When multiple fastening strips 4 are arranged at intervals around the reducer housing 2, the force uniformity and reliability of the connection between the axle housing 1 and the reducer housing 2 can be ensured.

[0059] In some embodiments, the shape of the bottom surface of the fastening strip 4 matches the shape of the outer surface of the corresponding position of the reducer housing 2.

[0060] For example, when the outer surface of the reducer housing 2 corresponding to the connection of the fastening strip 4 is a flat surface, the bottom surface of the fastening strip 4 is a flat surface. When the outer surface of the reducer housing 2 corresponding to the connection of the fastening strip 4 is a curved surface, the bottom of the fastening strip 4 is constructed as a curved surface, so that the fastening strip 4 is always in close contact with the reducer housing 2. For example, the top surface of the reducer housing 2 can be a flat surface, and the side surface of the reducer housing 2 can be constructed as a curved surface. The bottom surfaces of the fastening strips 4 at different positions are always in contact with the outer surfaces of the corresponding positions of the reducer housing 2 to further improve the reliability of the connection between the fastening strip 4 and the reducer housing 2.

[0061] In some embodiments, the side part of the reducer housing 2 includes two first inclined surfaces 24 located on both sides of the central axis in the axial direction of the axle housing 1, and at least one fastening strip 4 is provided on each first inclined surface 24.

[0062] Specifically, the axis of the axle housing 1 is parallel to the axis of the vehicle half shaft. The mounting window 11 is configured as a polygon. The side surface of the mounting window 11 includes at least two second inclined surfaces 15. For example, when each side of the mounting window 11 in the direction of the vehicle half shaft includes two second inclined surfaces 15, the two second inclined surfaces 15 are connected by a second connecting surface 17. The reducer housing 2 also includes two first inclined surfaces 24 corresponding to the side surface of the mounting window 11. The two first inclined surfaces 24 are connected by a first connecting surface 25. The first inclined surface 24 and the first connecting surface 25 of the reducer housing 2 are connected with an arc transition. Similarly, the second inclined surface 15 and the second connecting surface 17 of the mounting window 11 are connected with an arc transition. When using an arc transition connection, stress concentration at the transition of the two second inclined surfaces 15 of the mounting window 11 can be prevented, and deformation of the axle housing 1 and the reducer housing 2 can be reduced. Of course, in actual design, the arc transition connection may not be adopted according to actual situations.

[0063] Further, at least one second fastening strip 4 is provided on each first inclined surface 24 of the reducer housing 2, which can ensure the effective cooperation between the second fastening strip 4 and the first inclined surface 24 of the reducer housing 2 and the second inclined surface 15 of the mounting window 11. For example, the fitting degree of the fastening strip 4 with the axle housing 1 or the reducer housing 2 is improved, thereby improving the reliability of the connection between the axle housing 1 and the mounting window 11 through the first connecting member 5 and the second connecting member 6.

[0064] In some embodiments, the electric drive axle assembly 100 further includes a half shaft bushing 13 and a half shaft sleeve 14. Both ends of the axle housing 1 are provided with housing ends 12. The reducer housing 2 includes a mounting hole 23. The outer diameter of the half shaft bushing 13 is smaller than the inner diameter of the housing end 12, and the half shaft bushing 13 penetrates into the mounting hole 23 along the inside of the housing end 12 to be connected with the reducer housing 2. The other end of the half shaft bushing 13 is sleeved with a half shaft sleeve 14, and the half shaft sleeve 14 is connected with the housing end 12.

[0065] Among them, the half shaft sleeve 14 and the half shaft bushing 13 of the vehicle play a load-bearing role. They form an integral body with the drive axle housing 1 and support the mass of the frame and each assembly thereon at the same time.

[0066] Specifically, the half shaft bushing 13 is connected to the mounting hole 23 of the reducer housing 2. Of course, in actual operation, the half shaft sleeve 14 and the half shaft bushing 13 can also be made into one body according to the axial dimension and application requirements to achieve a reliable and stable connection with the reducer housing 2 and the end of the axle housing 1.

[0067] In some embodiments, the half shaft sleeve 14 includes a first pipe section 142 and a second pipe section 141. The outer diameter of the first pipe section 142 is smaller than the outer diameter of the second pipe section 141. The inner diameter of the first pipe section 142 is larger than the outer diameter of the half shaft bushing 13 and is sleeved on the end of the half shaft bushing 13, and the outer periphery contacts the inner periphery of the housing end 12. The second pipe section 141 is axially pressed against the housing end 12.

[0068] Referring to Figure 5 As shown, the first pipe section 142 is sleeved on the end of the half - shaft bushing 13, and the outer periphery of the first pipe section 142 is fitted with the inner periphery of the end of the axle housing 1. The second pipe section 141 also axially presses against the end of the axle housing 1, thereby improving the reliability and sealing performance of the connection between the half - shaft bushing 13 and the half - shaft sleeve 14.

[0069] In some embodiments, the electric drive axle assembly 100 further includes a first seal 132 and a second seal 131. First and second annular grooves are respectively provided on the outer peripheries at both ends of the half - shaft bushing 13. The first annular groove is sleeved with the first seal 132 and the second annular groove is sleeved with the second seal 131. When the half - shaft bushing 13 passes through the mounting hole 23, the first seal 132 presses against the reducer housing 2 and the second seal 131 presses against the half - shaft sleeve 14.

[0070] Specifically, the first seal 132 is a first O - ring rubber seal, and the second seal 131 is a second O - ring rubber seal. Referring to Figure 5 As shown, when one end of the half - shaft bushing 13 extends into the mounting hole 23 of the reducer housing 2, the circumferentially arranged first O - ring rubber seal on the half - shaft bushing 13 presses against the inner periphery at the mounting hole 23 of the reducer housing 2, preventing the lubricating oil in the reducer housing 2 from flowing out through the gap between the outer periphery of the half - shaft bushing 13 and the mounting hole 23. Similarly, the outer periphery of the second O - ring rubber seal presses against the inner periphery of the first pipe section 142 of the half - shaft sleeve 14, thereby sealing the gap between the half - shaft bushing 13 and the half - shaft sleeve 14 and preventing the lubricating oil from flowing out along the gap. It should be noted that the end of the half - shaft sleeve 14 far from the half - shaft bushing 13 is sealed with the wheel end assembly of the vehicle, thereby ensuring good sealing performance at the connection between the half - shaft sleeve 14 and the wheel end assembly. That is to say, through sealing, the leakage of the lubricating oil in the reducer housing 2 can be prevented, and the entry of external water into the interior of the reducer housing 2 can be prevented.

[0071] Moreover, compared with the prior - art method of sealing the large - size connection surface between the axle housing 1 and the reducer housing 2, the sealing surfaces of the first O - ring rubber seal and the second O - ring rubber seal are small in size, convenient to install, and high in reliability.

[0072] In some embodiments, the half - shaft sleeve 14 is crimped to the housing end 12.

[0073] First of all, crimping is a fixed connection method, which has high flexibility, is environmentally friendly, and is convenient and fast to operate. The method of crimping the half - shaft sleeve 14 to the housing end 12 can ensure better connection of the inner peripheries of the half - shaft sleeve 14 and the housing end 12 as a whole.

[0074] In some embodiments, the reducer housing 2 is integrally formed along a first direction, and the reducer housing 2 can be detachably connected along a direction parallel to the vehicle half shaft.

[0075] Referring to Figure 3 As shown, a dual motor 3 is provided in the reducer housing 2, and there is a shaft disposed parallel to the half shaft of the vehicle. The shaft is not shown. Assuming that the reducer housing 2 is divided into two parts along the first direction, and the mating surface where the reducer housing 2 is butted is parallel to the shaft disposed parallel to the half shaft of the vehicle. When the shaft is transmitting power, a radial force is formed on the reducer housing. Under high load conditions, the radial force of the shaft is relatively large, and the reducer housing 2 may not be able to maintain its initial state and deform, subsequently causing a change in the gear meshing state, resulting in problems such as strength, life, reliability, and NVH.

[0076] In the embodiment of the present invention, the reducer housing 2 is integrally formed along the first direction, and the first direction is perpendicular to the axial direction of the half shaft sleeve 14, which is equivalent to the reducer housing 2 being integrally formed along the front-rear direction of the vehicle. This can avoid the adverse effects of the radial force of the shaft in the reducer housing 2 on the axle housing 1 and the reducer housing 2, such as the problem of causing the reducer housing 2 to deform. And the reducer housing 2 can be detachably connected along a direction parallel to the vehicle half shaft, which can facilitate the disassembly and repair of the interior of the reducer housing 2, and at the same time ensure that the shaft inside the reducer housing 2 does not affect the deformation of the reducer housing 2 during power transmission.

[0077] In addition, the dual motor 3 and the reducer housing 2 in the embodiment of the present invention share a housing, with fewer parts and a simple structure.

[0078] In some embodiments, the reducer housing 2 is evenly arranged on both sides of the axle housing 1 in the first direction.

[0079] In practice, "evenly" can be understood as equal in size and weight. For example, the distance from one side of the axle housing 1 along the first direction to one end of the reducer housing 2 is equal to the distance from the other side of the axle housing 1 to the other end of the reducer housing 2. At this time, the force on the reducer housing 2 after being installed with the axle housing 1 can be made more uniform, the stability is enhanced, and thus the risk of deformation of the reducer housing 2 is reduced.

[0080] In some embodiments, there is a gap between the axle housing 1 and the reducer housing 2.

[0081] In practice, due to the existence of the gap between the axle housing 1 and the reducer housing 2, the force transmitted to the reducer housing 2 when the axle housing 1 deforms can be reduced. Therefore, the deformation of the reducer housing 2 caused by the deformation of the axle housing 1 can be reduced, and thus the problem of fastening failure caused by the relative displacement of the mating surface between the axle housing 1 and the reducer housing 2 can be reduced.

[0082] In some embodiments, the axle housing 1 further includes a drain port 112, which is adapted to drain water when water in the external environment enters the gap between the axle housing 1 and the speed reducer housing 2.

[0083] First, there is a clearance fit between the axle housing 1 and the outer side of the speed reducer housing 2 in the embodiments of the present invention. Considering the indirect connection between the speed reducer housing 2 and the axle housing 1 through the fastening strip 4, when the axle housing 1 deforms, the risk of the axle housing 1 causing the deformation of the speed reducer housing 2 is reduced, and the initial fit relationship between the parts inside the speed reducer housing 2 can be effectively maintained without change. The structural independence between the speed reducer housing 2 and the axle housing 1 is relatively strong, which is beneficial for the electric drive system to maintain good reliability and NVH performance.

[0084] Moreover, there is a large-size fit between the axle housing 1 and the speed reducer housing 2, eliminating the need for sealing, reducing the risk of seal failure and installation difficulty. When rainwater in the external environment or water in a wading section enters the gap between the axle housing 1 and the speed reducer housing 2, a drain port 112 is provided at the bottom of the installation window 11 of the axle housing 1, through which the water between the axle housing 1 and the speed reducer housing 2 can be drained in a timely manner.

[0085] The embodiments of the present invention also disclose a vehicle, including the above-mentioned electric drive axle assembly 100. The fastening strip 4 is used to connect the speed reducer housing 2 and the axle housing 1 in different directions, improving the connection reliability between the speed reducer housing 2 and the axle housing 1, reducing the problem of easy loosening under alternating loads, thereby preventing the components inside the speed reducer housing 2 from being affected and ensuring that the speed reducer maintains good performance.

[0086] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0087] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric drive axle assembly (100), characterized in that, Comprising: A bridge housing (1), the bridge housing (1) being provided with an installation channel (16) penetrating along a first direction; A speed reducer housing (2), the speed reducer housing (2) being installed in the installation channel (16) along the first direction; A fastening strip (4), the fastening strip (4) being installed outside the speed reducer housing (2), the fastening strip (4), the bridge housing (1), and the speed reducer housing (2) being connected by a first connecting member (5) penetrating along the first direction, and the fastening strip (4) and the speed reducer housing (2) being connected by a second connecting member (6) penetrating along a second direction.

2. The electric drive axle assembly (100) according to claim 1, characterized in that, The bridge housing (1) includes an installation window (11), the installation channel (16) is formed in the installation window (11), an installation flange (21) is formed on the outer peripheral wall of the speed reducer housing (2), the fastening strip (4) and the installation flange (21) are located on both sides of the installation window (11), and the first connecting member (5) sequentially penetrates through the installation flange (21), the installation window (11), and the fastening strip (4).

3. The electric drive axle assembly (100) according to claim 2, characterized in that, The outer periphery of the speed reducer housing (2) includes a circumferentially arranged first installation portion (22), the fastening strip (4) is arranged on the first installation portion (22) and is connected to the first installation portion (22) through the second connecting member (6) to be connected to the speed reducer housing (2).

4. The electric drive axle assembly (100) according to claim 3, characterized in that, The fastening strip (4) includes a plurality of first connection holes (41) and second connection holes (42) distributed at intervals, the first connection holes (41) penetrate along the first direction, the second connection holes (42) penetrate along the second direction, and the first connecting member (5) and the second connecting member (6) are multiple. Each first connecting member (5) penetrates through the corresponding first connection hole (41) to be connected to the bridge housing (1) and the speed reducer housing (2), and each second connecting member (6) penetrates through the corresponding second connection hole (42) to be connected to the speed reducer housing (2).

5. The electric drive axle assembly (100) according to claim 4, characterized in that, The fastening strip (4) is provided with grooves (43) and protrusions (44) distributed at intervals along the length direction, the first connection holes (41) are arranged at the protrusions (44) along the first direction, and the second connection holes (42) penetrate through the grooves (43) along the second direction.

6. The electric drive axle assembly (100) according to claim 1, wherein, There are multiple fastening strips (4). Some of the multiple fastening strips (4) are located at the top and bottom of the speed reducer housing (2), and some of the other fastening strips (4) are located at the side of the speed reducer housing (2). The multiple fastening strips (4) are all connected to the bridge housing (1) and the speed reducer housing (2) along the first direction, and are also connected to the speed reducer housing (2) along the second direction.

7. The electric drive axle assembly (100) according to claim 1, characterized in that, The bottom surface shape of the fastening strip (4) matches the shape of the outer surface of the speed reducer housing (2) at the corresponding position.

8. The electric drive axle assembly (100) according to claim 1, characterized in that, The side of the speed reducer housing (2) includes two first inclined surfaces (24) located on both sides of the central axis in the axial direction of the bridge housing (1), and at least one fastening strip (4) is provided on each first inclined surface (24).

9. The electric drive axle assembly (100) according to claim 1, characterized in that, It also includes a half - shaft bushing (13) and a half - shaft sleeve (14). Both ends of the axle housing (1) are provided with housing ends (12). The speed reducer housing (2) includes a mounting hole (23). The outer diameter of the half - shaft bushing (13) is smaller than the inner diameter of the housing end (12) and penetrates into the mounting hole (23) along the inside of the housing end (12) to be connected to the speed reducer housing (2). The other end of the half - shaft bushing (13) is sleeved with the half - shaft sleeve (14), and the half - shaft sleeve (14) is connected to the housing end (12).

10. The electric drive axle assembly (100) according to claim 9, characterized in that, The half - shaft sleeve (14) includes a first pipe section (142) and a second pipe section (141). The outer diameter of the first pipe section (142) is smaller than the outer diameter of the second pipe section (141). The inner diameter of the first pipe section (142) is larger than the outer diameter of the half - shaft bushing (13) and is sleeved on the end of the half - shaft bushing (13), and its outer circumference contacts the inner circumference of the housing end (12). The second pipe section (141) is axially pressed against the housing end (12).

11. The electric drive axle assembly (100) according to claim 10, wherein, It also includes a first seal (132) and a second seal (131). First and second annular grooves are respectively provided on the outer circumferences at both ends of the half - shaft bushing (13). The first annular groove is sleeved with the first seal (132), and the second annular groove is sleeved with the second seal (131). The first seal (132) is pressed against the speed reducer housing (2), and the second seal (131) is pressed against the half - shaft sleeve (14).

12. The electric drive axle assembly (100) according to claim 10, characterized in that, The half - shaft sleeve (14) is crimped to the housing end (12).

13. The electric drive axle assembly (100) according to claim 1, characterized in that, The speed reducer housing (2) is integrally formed along the first direction, and the speed reducer housing (2) is detachably connected along the direction parallel to the vehicle half - shaft.

14. The electric drive axle assembly (100) according to claim 1, wherein, The speed reducer housing (2) is evenly arranged on both sides of the axle housing (1) along the first direction.

15. The electric drive axle assembly (100) according to claim 1, wherein, A gap is left between the axle housing (1) and the speed reducer housing (2).

16. The electric drive axle assembly (100) according to claim 15, characterized in that, The axle housing (1) also includes a drain port (112), and the drain port (112) is adapted to drain water when water in the external environment enters the gap.

17. A vehicle, characterized in that, It includes the electric drive axle assembly (100) according to any one of claims 1 - 16.

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