Electric drive axle housing assembly

Abstract

The present application discloses an electric drive axle housing assembly. In the electric drive axle housing assembly, the axle housing cover includes a cavity, and a first protrusion and a second protrusion extending out of the cavity are sequentially arranged in the cavity along a first direction. The first side wall surface on the first protrusion and the second side wall surface on the second protrusion are arranged opposite to each other along the first direction, and together with the wall surface between the first protrusion and the second protrusion in the cavity, define a mounting cavity for accommodating an output gear. The oil suction part includes an oil channel and an oil pump located in the first protrusion, the oil suction port of the oil channel is arranged on the first bottom wall surface of the first protrusion, the oil outlet of the oil channel is connected to the oil pump, the oil suction port is independent of the mounting cavity, and the oil suction port is connected to the mounting cavity. The electric drive axle housing assembly provided by the present application reduces the amount of oil added to the middle cavity on the basis of ensuring the liquid level required for lubrication, saves lubricating oil, makes full use of the space inside the middle cavity, increases the compactness of the structure, avoids the agitated lubricating oil from directly entering the oil suction port, and ensures the normal operation of the oil pump.

Description

Technical Field

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

[0002] The electric drive axle includes a middle cavity and a wheel end part connected to both ends of the middle cavity through a drive axle, and a drive motor, a reduction mechanism, etc. are arranged in the middle cavity. The drive motor can be an asynchronous motor, a synchronous motor, an excitation motor, etc. The reduction mechanism can be divided into two or more gears, with or without disengagement, one, two or three stages of reduction, and the drive axle wheel end can be divided into with or without wheel end reduction.

[0003] The reduction mechanism located in the middle cavity needs to be lubricated with lubricating oil when working. In the process of realizing the invention, the inventor found that the existing middle cavity has the following improvements. First, since the inner cavity structure of the middle cavity is simple and the cavity area is relatively large, in order to ensure that the reduction mechanism is fully lubricated, the lubricating oil level required in the middle cavity is generally high, resulting in the problem of excessive refueling in the middle cavity, which not only increases the weight of the electric drive axle, but also causes waste of lubricating oil. Second, the cavity area of ​​the middle cavity cannot be effectively utilized, resulting in waste of internal space, which is not conducive to the compactness of the structure of the electric drive axle. Third, the gears in the middle cavity will stir the lubricating oil during rotation. The stirred lubricating oil directly enters the oil suction port, which has the problem of poor flow stability and affects the normal operation of the oil pump. Summary of the invention

[0004] The purpose of the present application is to provide an electric drive axle housing assembly, which reduces the amount of oil added to the middle cavity of the electric drive axle, saves lubricating oil, makes full use of the space inside the middle cavity, increases the structural compactness of the electric drive axle, prevents the agitated lubricating oil from directly entering the oil suction port, and ensures the normal operation of the oil pump.

[0005] The technical solution of the present application provides an electric drive bridge housing assembly, including: a bridge housing cover, including a cavity, in which a first protrusion and a second protrusion extending out of the cavity are sequentially arranged along a first direction in the cavity, a first side wall surface on the first protrusion and a second side wall surface on the second protrusion are arranged relatively to each other along the first direction, and together with the wall surface in the cavity located between the first protrusion and the second protrusion, define an installation cavity for accommodating an output gear, and the first direction is a direction perpendicular to the end face of the output gear; an oil suction part, including an oil channel and an oil pump located in the first protrusion, the oil suction port of the oil channel is arranged on the first bottom wall surface of the first protrusion, the oil outlet of the oil channel is connected with the inlet of the oil pump, the oil suction port is independent of the installation cavity, and the oil suction port is connected with the installation cavity.

[0006] Optionally, a partial area of ​​the first bottom wall surface is concavely arranged to define a mounting groove, the oil suction port is located on the groove wall of the mounting groove, a filter covering the oil suction port is installed in the mounting groove, and the notch of the mounting groove is connected to the mounting cavity.

[0007] Optionally, an oil supply port is provided on the first protrusion, the oil supply port is communicated with an outlet of the oil pump, an oil supply pipe is connected to the oil supply port, and the outlet of the oil supply pipe is arranged toward the output gear.

[0008] Optionally, the electric drive bridge housing assembly also includes a bridge housing body, the bridge housing cover and the bridge housing body are sealed and fastened to define a accommodating cavity, the first protrusion extends into the bridge housing body, the first bottom wall surface and the second bottom wall surface of the bridge housing body are arranged opposite to each other to define an oil suction cavity, the installation cavity is independent of the oil suction cavity, and the installation cavity is communicated with the oil suction cavity.

[0009] Optionally, the first bottom wall surface is an inclined surface, the bottom end of the first bottom wall surface is connected to the bottom end of the first side wall surface and is arranged opposite to the second bottom wall surface at the connection point to define an oil-passing constriction connecting the installation cavity and the oil suction cavity.

[0010] Optionally, a partition plate is provided between the first protrusion and the second bottom wall surface and is spaced between the installation cavity and the oil suction cavity, and an oil passing hole is provided on the partition plate.

[0011] Optionally, the electric drive axle housing assembly further includes an output shaft extending along a first direction and disposed in the accommodating cavity, the output gear is mounted on the output shaft, and the first protrusion and the second protrusion are at least partially located below the output shaft.

[0012] Optionally, a first bearing seat and a second bearing seat are also installed on the output shaft, the first bearing seat and the second bearing seat are respectively located on both sides of the output gear along the first direction, the first protrusion is located between the output gear and the first bearing seat, and the second protrusion is located between the output gear and the second bearing seat.

[0013] Optionally, at least one of the first top wall surface of the first protrusion and the second top wall surface of the second protrusion is located below the output shaft and is configured as a curved surface adapted to the output shaft, with a preset distance between the curved surface and the output shaft.

[0014] Optionally, end surfaces of the first protrusion and the second protrusion extend to abut against a side wall surface of the bridge housing body.

[0015] The above technical solution has the following beneficial effects:

[0016] The electric drive axle housing assembly provided by the present application, the first protrusion and the second protrusion can effectively fill the space in the cavity, reducing the required amount of oil while ensuring the lubricating oil level; by arranging the oil channel and the oil pump that drive the circulation of the lubricating oil in the first protrusion, the space in the cavity can be effectively utilized, and the compactness of the axle housing cover is increased, which is beneficial to reducing the volume of the electric drive axle housing assembly and achieving miniaturization compared to arranging the oil pump and the oil channel on the outside of the axle housing cover; and the oil suction port is arranged on the first bottom wall surface and is relatively independent of the mounting cavity, and the oil suction port is connected with the mounting cavity, so as to prevent the lubricating oil stirred in the mounting cavity from directly entering the oil suction port, thereby ensuring stable oil supply and normal operation of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the bridge housing cover in one embodiment of the present application.

[0018] Figure 2 This is a schematic diagram of the structure in which the output gear is arranged in the mounting cavity in one embodiment of the present application.

[0019] Figure 3 This is a schematic structural diagram of a first protrusion and a second protrusion separately arranged on the bridge housing cover in one embodiment of the present application.

[0020] Figure 4 It is a schematic structural diagram of the bridge housing body in one embodiment of the present application.

[0021] Figure 5 It is a cross-sectional view of a first protrusion in one embodiment of the present application.

[0022] Figure 6 This is a schematic diagram of the structure in which lubricating oil enters the first protrusion in one embodiment of the present application.

[0023] Reference Numbers

[0024] 1-bridge housing cover, 10-cavity, 11-installation cavity, 12-first buckle plate.

[0025] 2-first protrusion, 20-first side wall, 21-first bottom wall, 210-oil suction port, 211-installation groove, 22-oil supply port, 23-first top wall.

[0026] 3-second protrusion, 30-second side wall, 31-avoidance, 32-second top wall.

[0027] 4- oil suction part, 40- oil channel, 41- oil pump, 42- filter.

[0028] 5-Output gear.

[0029] 6-bridge housing body, 60-second bottom wall, 61-oil suction chamber, 62-output shaft, 63-first bearing seat, 64-second bearing seat, 65-second buckle plate, 66-differential assembly. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the invention.

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0033] The present application provides an electric drive axle housing assembly, comprising: an axle housing cover 1 and an oil suction portion 4.

[0034] Please refer to Figure 1 and Figure 2 The bridge housing cover 1 includes a cavity 10, in which a first protrusion 2 and a second protrusion 3 extending out of the cavity 10 are sequentially arranged along a first direction, and a first side wall surface 20 on the first protrusion 2 and a second side surface on the second protrusion 3 are arranged opposite to each other along the first direction, and together with the wall surface between the first protrusion 2 and the second protrusion 3 in the cavity 10, define a mounting cavity 11 for accommodating the output gear 5. The mounting cavity 11 is relatively closed to other parts in the cavity 10, and the splash loss of the agitated lubricating oil is reduced when the output gear 5 rotates.

[0035] The oil suction part 4 includes an oil passage 40 and an oil pump 41 located in the first protrusion 2. The oil suction port 210 of the oil passage 40 is arranged on the first bottom wall surface 21 of the first protrusion 2. The oil suction port 210 is independent of the mounting cavity 11. The oil suction port 210 is connected to the mounting cavity 11. The oil outlet of the oil passage 40 is connected to the inlet of the oil pump 41. Please refer to Figure 6 , Figure 6 The direction indicated by the arrow A is the rotation direction of the output gear 5. When the output gear 5 rotates, the lubricating oil in the mounting cavity 11 is disturbed to a certain extent. Figure 1As shown, the first bottom wall surface 21 is independent of the outside of the mounting cavity 11, and is connected to the mounting cavity 11 through the space below the first bottom wall surface 21, so that the lubricating oil at the oil suction port 210 will not flow rapidly due to the stirring of the output gear 5 in the mounting cavity 11, thereby increasing the smoothness of the flow of the lubricating oil at the oil suction port 210 and ensuring stable oil supply.

[0036] The first direction in the embodiment of the present application may be a direction perpendicular to the end surface of the output gear 5, such as Figure 2 As shown, partial areas of the two end surfaces of the output gear 5 are arranged in the installation cavity 11 and are respectively arranged opposite to the first side wall surface 20 on the first protrusion 2 and the second side wall surface 30 on the second protrusion 3. Among them, the vertical distance between the end surface of the output gear 5 facing the first side wall surface 20 and the first side wall surface 20, and the vertical distance between the end surface of the output gear 5 facing the second side wall surface 30 and the second side wall surface 30 can be set to 5mm, 8mm or 1cm, etc., so as to achieve effective wrapping of the output gear 5 by the installation cavity 11.

[0037] The first protrusion 2 and the second protrusion 3 in the embodiment of the present application can be integrally formed on the bridge housing cover 1 by stamping or integral casting. Figure 1 It can also be installed on the bridge housing cover 1 by bolt connection, such as Figure 3 shown.

[0038] In the electric drive axle housing assembly provided in the embodiment of the present application, the first protrusion 2 and the second protrusion 3 can effectively fill the space in the cavity 10, reducing the required amount of oil while ensuring the lubricating oil level; by arranging the oil channel 40 and the oil pump 41 that drive the circulation of the lubricating oil in the first protrusion 2, the space in the cavity 10 can be effectively utilized, and the compactness of the axle housing cover 1 is increased. Compared with arranging the oil pump 41 and the oil channel 40 on the outside of the axle housing cover 1, it is beneficial to reduce the volume of the electric drive axle housing assembly and achieve miniaturization; and the oil suction port 210 is arranged on the first bottom wall surface 21 and is relatively independent of the installation cavity 11. At the same time, the oil suction port 210 is connected with the installation cavity 11, so as to prevent the lubricating oil stirred in the installation cavity 11 from directly entering the oil suction port 210, thereby ensuring the normal operation of the oil pump 41.

[0039] In an optional embodiment of the oil suction part 4, a portion of the first bottom wall surface 21 is concavely arranged to define a mounting groove 211, the oil suction port 210 is located on the groove wall of the mounting groove 211, a filter screen 42 covering the oil suction port 210 is installed in the mounting groove 211, and the notch of the mounting groove 211 is connected to the mounting cavity 11. Figure 5As shown, the slot of the mounting slot 211 is set downward, the filter screen 42 is cylindrical, one end of which is covered and mounted on the oil suction port 210, and the other end is positioned on the other slot wall of the mounting slot 211. The side of the filter screen 42 is a mesh structure for filtering the lubricating oil entering the oil suction port 210. The embodiment of the present application allows the lubricating oil in the oil suction chamber 61 to pass through the filter screen 42 as shown in FIG. Figure 6 The oil enters the oil suction port 210 after the broken line path shown by the middle arrow B, further buffering the influence of the stirring of the output gear 5 in the installation cavity 11, which is beneficial to increase the stability of the lubricating oil when entering the oil suction port 210 and ensure stable oil supply.

[0040] In an optional embodiment of the first protrusion 2, an oil supply port 22 is provided on the first protrusion 2, and the oil supply port 22 is communicated with the outlet of the oil pump 41. An oil supply pipe is connected to the oil supply port 22, and the outlet of the oil supply pipe is arranged toward the output gear 5 to supply lubricating oil to the output gear 5. The oil supply pipe in the embodiment of the present application transports the filtered lubricating oil to the cavity 10 again through the oil supply port 22 to lubricate the output gear 5 and other components, thereby realizing the circulation of the lubricating oil. Moreover, the entire circulation process of the lubricating oil is completed in the cavity 10, shortening the circulation path, which is beneficial to reducing oil loss. Among them, the oil supply port 22 can be opened on the top wall of the first protrusion 2, such as Figure 3 shown.

[0041] In an optional installation mode of the axle housing cover 1, the electric drive axle housing assembly further includes an axle housing body 6, the axle housing cover 1 and the axle housing body 6 are sealed and buckled to define a receiving cavity, the first protrusion 2 extends into the axle housing body 6, the first bottom wall surface 21 and the second bottom wall surface 60 of the axle housing body 6 are arranged opposite to each other to define an oil suction cavity 61, the installation cavity 11 is independent of the oil suction cavity 61, and the installation cavity 11 is connected to the oil suction cavity 61. Figure 4 As shown, the output gear 5 and other driving structures are installed in the axle housing body 6. The first protrusion 2 extends into the axle housing body 6 and defines an oil suction chamber 61 which is relatively independent of the installation chamber 11 through the first bottom wall surface 21 and the second bottom wall surface 60, so as to reduce the influence of the stirring of the lubricating oil in the installation chamber 11 on the lubricating oil in the oil suction chamber 61, so that the lubricating oil can be smoothly sucked into the oil suction port 210 in the oil suction chamber 61, as shown in FIG. Figure 5 and Figure 6 shown.

[0042] The bridge housing cover 1 is provided with a first buckle plate 12 on the periphery of the cavity 10. Figures 1 to 3 The outer periphery of the bridge housing body 6 is provided with a second buckle plate 65, as shown in FIG. Figure 4 When the axle housing cover 1 is buckled with the axle housing body 6, the first buckle plate 12 and the second buckle plate 65 are connected to each other and connected by bolts. A sealing gasket can be provided between the first buckle plate 12 and the second buckle plate 65 to ensure sealing.

[0043] In an optional embodiment in which the oil suction chamber 61 is connected to the installation chamber 11, the first bottom wall surface 21 is an inclined surface, the bottom end of the first bottom wall surface 21 is connected to the bottom end of the first side wall surface 20 and is arranged opposite to the second bottom wall surface 60 located below at the connection point to define an oil passage constriction connecting the installation chamber 11 and the oil suction chamber 61. Figures 1 to 3 As shown, the inclined structure of the first bottom wall 21 makes the vertical distance between the bottom end of the first bottom wall 21 and the second bottom wall 60 smaller, and the bottom end of the first bottom wall 21 is set at the connection with the first side wall 20, so that the oil suction chamber 61 has a smaller cross-section at the oil-passing constriction, and only allows the lubricating oil that flows more smoothly at the bottom of the installation cavity 11 to pass, which is beneficial to maintaining the stability of the lubricating oil in the oil suction chamber 61.

[0044] In another optional embodiment in which the oil suction chamber 61 is connected to the installation chamber 11, a partition is provided between the first protrusion 2 and the second bottom wall surface 60, and an oil-passing hole is provided on the partition. The partition in the embodiment of the present application can effectively separate the installation chamber 11 from the oil suction chamber 61, so that the installation chamber 11 and the oil suction chamber 61 are relatively independent, reducing the influence of the agitation of the lubricating oil in the installation chamber 11 on the lubricating oil in the oil suction chamber 61, and the oil-passing hole allows the installation chamber 11 to maintain communication with the oil suction chamber 61.

[0045] In an optional embodiment, if Figure 2 As shown, the electric drive axle housing assembly also includes an output shaft 62 extending in the first direction and arranged in the accommodating cavity, the output gear 5 is mounted on the output shaft 62, and the first protrusion 2 and the second protrusion 3 are at least partially located below the output shaft 62. The space below the output shaft 62 is an area where more lubricating oil gathers. The first protrusion 2 and the second protrusion 3 are at least partially arranged below the output shaft 62 to reduce the amount of lubricating oil required to reach the lubricating liquid level in the cavity 10. Figure 3 As shown, when the first protrusion 2 and the second protrusion 3 are separately provided with the bridge housing cover 1, the first protrusion 2 and the second protrusion 3 are all located below the output shaft 62 to fully fill the space below the output shaft 62. Figure 1 As shown, when the first protrusion 2 and the second protrusion 3 are integrally arranged on the bridge housing cover 1 , the first protrusion 2 and the second protrusion 3 are smoothly connected to the cavity 10 and are partially arranged below the output shaft 62 .

[0046] In an embodiment where the first protrusion 2 and the second protrusion 3 are adapted to the components on the output shaft 62, the output shaft 62 is also provided with a first bearing seat 63 and a second bearing seat 64, the first bearing seat 63 and the second bearing seat 64 are respectively located on both sides of the output gear 5 along the first direction, the first protrusion 2 is located between the output gear 5 and the first bearing seat 63, and the second protrusion 3 is located between the output gear 5 and the second bearing seat 64. The first bearing seat 63 and the second bearing seat 64 in the embodiment of the present application can be installed or integrally formed on the bridge housing body 6, and a bearing rotatably connected to the output shaft 62 is provided therein. Figure 2 As shown, the first protrusion 2 is disposed between the output gear 5 and the first bearing seat 63, and the second protrusion 3 is disposed between the output gear 5 and the second bearing seat 64, so as to fully fill the space in the cavity 10, and further reduce the amount of lubricating oil required to reach the lubricating liquid level in the cavity 10. In addition, a differential assembly 66 may be disposed between the output gear 5 and the second bearing seat 64. When the volume of the differential assembly 66 is large, an avoidance opening 31 is further disposed on the top of the second protrusion 3 to avoid the differential assembly 66, as shown in FIG. Figures 1 to 3 shown.

[0047] In an embodiment in which the first protrusion 2 and the second protrusion 3 are adapted to the output shaft 62, at least one of the first top wall surface 23 of the first protrusion 2 and the second top wall surface 32 of the second protrusion 3 is located below the output shaft 62 and is configured as an arc surface adapted to the output shaft 62, with a preset spacing being left between the arc surface and the output shaft 62. Figure 3 The first top wall surface 23 and the second top wall surface 32 shown are both cambered surfaces, which is an optional embodiment. In addition, only the first top wall surface 23 or only the second top wall surface 32 may be a cambered surface. The cambered surface can make the lubricating oil on the first top wall surface 23 and the second top wall surface 32 quickly gather at the bottom and then be discharged. The preset spacing between the output shaft 62 and the cambered surface can be 1 cm, 1.5 cm, 2 cm, etc., to effectively fill the space below the first output shaft 62 without interfering with the rotation of the output shaft 62.

[0048] In an optional embodiment, the end faces of the first protrusion 2 and the second protrusion 3 extend to abut against the side wall surface of the bridge housing body 6. In the embodiment of the present application, the end faces of the first protrusion 2 and the second protrusion 3 away from the cavity 10 abut against the side wall surface of the bridge housing body 6, which not only fully fills the space between the bridge housing cover 1 and the bridge housing body 6, reducing the amount of lubricating oil required to reach the lubricating level in the cavity 10; but also facilitates further spacing of the installation cavity 11 and the oil suction cavity 61, reducing the impact of the installation cavity 11 on the oil suction cavity 61; in addition, the installation stability between the bridge housing cover 1 and the bridge housing body 6 is increased by providing a supporting effect.

[0049] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0050] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. An electric drive axle housing assembly, characterized in that: include: A bridge housing cover, comprising a cavity, wherein a first protrusion and a second protrusion extending out of the cavity are sequentially arranged in the cavity along a first direction, a first side wall surface on the first protrusion and a second side wall surface on the second protrusion are arranged opposite to each other along the first direction, and together with a wall surface in the cavity between the first protrusion and the second protrusion, define a mounting cavity for accommodating an output gear, wherein the first direction is a direction perpendicular to an end face of the output gear; The oil suction part includes an oil channel and an oil pump located in the first protrusion, the oil suction port of the oil channel is arranged on the first bottom wall surface of the first protrusion, the oil outlet of the oil channel is connected with the inlet of the oil pump, the oil suction port is independent of the installation cavity, and the oil suction port is connected with the installation cavity.

2. The electric drive axle housing assembly according to claim 1, characterized in that: A partial area of ​​the first bottom wall surface is concavely arranged to define a mounting groove, the oil suction port is located on the groove wall of the mounting groove, a filter covering the oil suction port is installed in the mounting groove, and the notch of the mounting groove is connected to the mounting cavity.

3. The electric drive axle housing assembly according to claim 1, characterized in that: An oil supply port is provided on the first protrusion, the oil supply port is communicated with the outlet of the oil pump, an oil supply pipe is connected to the oil supply port, and the outlet of the oil supply pipe is arranged toward the output gear.

4. The electric drive axle housing assembly according to any one of claims 1 to 3, characterized in that: The electric drive bridge housing assembly also includes a bridge housing body, the bridge housing cover and the bridge housing body are sealed and fastened to define a accommodating cavity, the first protrusion extends into the bridge housing body, the first bottom wall surface and the second bottom wall surface of the bridge housing body are arranged opposite to each other to define an oil suction cavity, the installation cavity is independent of the oil suction cavity, and the installation cavity is communicated with the oil suction cavity.

5. The electric drive axle housing assembly according to claim 4, characterized in that: The first bottom wall surface is an inclined surface, the bottom end of the first bottom wall surface is connected to the bottom end of the first side wall surface and is arranged opposite to the second bottom wall surface at the connection point to define an oil-passing constriction connecting the installation cavity and the oil suction cavity.

6. The electric drive axle housing assembly according to claim 4, characterized in that: A partition plate is provided between the first protrusion and the second bottom wall surface, and is spaced between the installation cavity and the oil suction cavity. An oil passing hole is provided on the partition plate.

7. The electric drive axle housing assembly according to claim 4, characterized in that: The electric drive axle housing assembly also includes an output shaft extending along a first direction and arranged in the accommodating cavity, the output gear is mounted on the output shaft, and the first protrusion and the second protrusion are at least partially located below the output shaft.

8. The electric drive axle housing assembly according to claim 7, characterized in that: A first bearing seat and a second bearing seat are also installed on the output shaft. The first bearing seat and the second bearing seat are respectively located on both sides of the output gear along the first direction. The first protrusion is located between the output gear and the first bearing seat, and the second protrusion is located between the output gear and the second bearing seat.

9. The electric drive axle housing assembly according to claim 8, characterized in that: At least one of the first top wall surface of the first protrusion and the second top wall surface of the second protrusion is located below the output shaft and is configured as an arc surface adapted to the output shaft, with a preset distance between the arc surface and the output shaft.

10. The electric drive axle housing assembly according to claim 4, characterized in that: End surfaces of the first protrusion and the second protrusion extend to abut against a side wall surface of the axle housing body.

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