Axle housing of electric drive axle

Abstract

The utility model discloses an electric drive axle housing which comprises a containing cavity part and an axle tube, a first groove and a second groove are formed in the inner wall of the containing cavity part, the first groove and the second groove are oppositely arranged in the direction perpendicular to the axis of the axle tube, and the first groove and the second groove are both sunken outwards relative to the inner wall of the containing cavity part. A gearbox output gear mounting space is defined by the first groove and the second groove. In the specific implementation of the gearbox output gear, the first groove and the second groove which are opposite to each other are formed in the inner wall of the containing cavity part, and the first groove and the second groove are both sunken towards the outer side of the containing cavity part, so that a larger gearbox output gear mounting space can be formed. And under the condition, the inner cavity of the accommodating cavity part can be set to be smaller, so long as the differential can be accommodated. As the inner cavity of the containing cavity part is small, the appearance size of the containing cavity part is correspondingly small, the weight of the containing cavity part is light, the energy consumption of the vehicle can be reduced, and the trafficability of the vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive axles, in particular to an electric drive axle housing. Background Art

[0002] The axle housing of an electric drive axle generally consists of a housing and axle tubes positioned on either side of the housing. Axle shafts are mounted within the axle tubes. The housing houses the differential, which requires ample space within the housing. Consequently, the housing's dimensions are relatively large and its weight is relatively heavy. This increases vehicle energy consumption and reduces vehicle maneuverability.

[0003] Therefore, how to reduce the external size and weight of the cavity portion, thereby reducing vehicle energy consumption and improving vehicle passability, is a key issue that needs to be urgently addressed by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of the present invention is to reduce the external size and weight of the cavity portion, thereby reducing vehicle energy consumption and improving vehicle trafficability.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An electric drive axle housing includes a cavity portion and a shaft tube. A first groove and a second groove are provided on the inner wall of the cavity portion. The first groove and the second groove are arranged relative to each other in a direction perpendicular to the axis of the shaft tube. The first groove and the second groove are both recessed outward relative to the inner wall of the cavity portion. The first groove and the second groove enclose a gearbox output gear installation space.

[0007] Preferably, a third groove is provided on the inner wall of one side of the cavity portion in the axial direction of the shaft tube. The third groove is recessed outward relative to the inner wall of the cavity portion, and the third groove forms a moving space for the differential lock fork.

[0008] Preferably, the outer wall of the cavity portion has a first plane section and a second plane section that are arranged opposite to each other, the vertical diameter line of the cavity portion is perpendicular to the first plane section and the second plane section, the distance between the first plane section and the second plane section is a first threshold, the diameter of the circumscribed circle of the projection of the cavity portion in the vertical plane is a second threshold, and the first threshold is smaller than the second threshold.

[0009] Preferably, in the axial direction of the cavity portion, the cavity portion has a first port and a second port, a first flange is welded around the first port, and a second flange is welded around the second port, the first flange cooperates with the flange of the gearbox, the first flange is provided with a first bolt hole, and the flange of the gearbox is provided with an internally threaded blind hole that cooperates with the first bolt hole;

[0010] The second flange cooperates with the flange of the rear cover, and the rear cover is used to cover the protruding end of the gearbox. The second flange is provided with a second bolt hole, and the flange of the rear cover is provided with a third bolt hole that cooperates with the second bolt hole. The second flange is also provided with a through hole coaxially arranged with the first bolt hole, and the through hole is communicated with the first bolt hole. The through hole is for a bolt locking tool to pass through, and the bolt locking tool is used to lock the bolt in the first bolt hole and the internally threaded blind hole.

[0011] Preferably, a first stop is provided at the first port, the first stop is arranged around the axis of the cavity portion, and a second stop is provided on the gearbox to fit in the first stop.

[0012] Preferably, a third stop is provided on the inner wall of the rear cover, and the third stop is arranged around the axis of the cavity portion, and a fourth stop is provided on the gearbox to fit in the third stop.

[0013] Preferably, a differential lock fork cover is integrated on the rear cover, and the differential lock fork and the differential lock fork shaft are arranged in the differential lock fork cover. The differential lock fork cover includes a flat shell plate, and the flat shell plate is used to fix the cylinder of the differential lock. The piston of the cylinder passes through the flat shell plate and is connected to the differential lock fork shaft.

[0014] Preferably, a vent hole is provided on the cavity wall of the cavity portion, the vent hole connects the inner cavity of the cavity portion with the outside world, a vent plug is provided in the vent hole, and the vent plug extends into the inner cavity of the cavity portion; an oil baffle plate is connected to the inner wall of the cavity portion, the plate surface on one side of the oil baffle plate is opposite to the vent plug, and there is a preset distance between the oil baffle plate and the vent plug.

[0015] Preferably, the shaft tube is connected to the cavity portion through a connecting portion, the shaft tube is welded to the end of the connecting portion, a shaft tube lining ring is provided inside the shaft tube, and the outer surface of the shaft tube lining ring abuts against the weld between the shaft portion and the connecting tube.

[0016] Preferably, a motor is connected to the gearbox, and in the axial direction of the shaft tube, the motor is located on one side of the gearbox, and the central axis of the cavity portion is along the axial direction of the shaft tube and deviates from the central axis of the electric drive axle housing toward the opposite side of the motor.

[0017] From the above technical solution, it can be seen that in the specific implementation of the present invention, a first groove and a second groove are provided on the inner wall of the cavity portion, both of which are recessed toward the outside of the cavity portion. This creates a larger mounting space for the transmission output gear. In this case, the internal cavity of the cavity portion can be made smaller, as long as it can accommodate the differential. Due to the smaller internal cavity of the cavity portion, the external dimensions of the cavity portion are correspondingly smaller, and the weight of the cavity portion is also lighter, which can reduce vehicle energy consumption and improve vehicle trafficability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 A top view of the electric drive axle housing disclosed in a specific embodiment of the present utility model;

[0020] Figure 2 A cross-sectional view of the cavity portion disclosed in a specific embodiment of the present utility model;

[0021] Figure 3 A plan view of the electric drive axle housing disclosed in a specific embodiment of the present utility model at a first viewing angle;

[0022] Figure 4 A plan view of the electric drive axle housing disclosed in a specific embodiment of the present utility model at a second viewing angle;

[0023] Figure 5 This is a schematic structural diagram of a back cover disclosed in a specific embodiment of the present utility model;

[0024] Figure 6 A partial cross-sectional view of the cavity portion, the gearbox, and the rear cover disclosed in a specific embodiment of the present utility model;

[0025] Figure 7 This is a schematic structural diagram of the vent plug and oil baffle disclosed in a specific embodiment of the present utility model;

[0026] Figure 8 A cross-sectional view of the shaft tube and the connecting portion disclosed in a specific embodiment of the present utility model;

[0027] Figure 9 This is a top view of the electric drive axle disclosed in a specific embodiment of the utility model.

[0028] The names of the components are as follows:

[0029] 1- cavity portion, 101- first groove, 102- second groove, 103- third groove, 104- first plane section, 105- second plane section, 106- oil drain hole, 107- first stop, 108- first port, 109- first flange, 110- first bolt hole, 111- second port, 112- second flange, 113- second bolt hole, 114- through hole, 115- vent hole, 116- vent plug, 117- oil baffle, 2- shaft tube, 3- connecting portion, 4- rear cover, 401- differential lock fork cover, 402- flange of rear cover, 403- installation space for differential lock fork and differential lock fork shaft, 404- flat shell plate, 405- third stop, 406- oil filling hole, 5- shaft tube bushing, 6- gearbox, 7- motor. DETAILED DESCRIPTION

[0030] In view of this, the core of the present invention is to design an electric drive axle housing, which has small dimensions and light weight, thereby reducing vehicle energy consumption and improving vehicle passability.

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0032] Please refer to the attached Figure 1 -Attached Figure 2 The specific embodiment of the present utility model discloses an electric drive axle housing, which includes a cavity portion 1 and a shaft tube 2. There are two shaft tubes 2, which are arranged on both sides of the cavity portion 1. The cavity portion 1 is used to set the differential. The shaft tube 2 is used to set the half shaft. In this specific embodiment, a first groove 101 and a second groove 102 are provided on the inner wall of the cavity portion 1. The first groove 101 and the second groove 102 are arranged relative to each other in a direction perpendicular to the axis of the shaft tube 2. The first groove 101 and the second groove 102 are both recessed outward relative to the inner wall of the cavity portion 1. The first groove 101 and the second groove 102 enclose the gearbox output gear installation space.

[0033] The transmission output gear is located within the cavity portion 1 and drives the differential. The transmission output gear is the largest component within the cavity portion 1. Typically, the interior of the cavity portion 1 is configured as a standard annular cavity, capable of accommodating the transmission output gear 6. In other words, the interior of the cavity portion 1 is a standard annular cavity designed to accommodate the transmission output gear. Since the transmission output gear has a relatively large external dimension, the interior of the cavity portion 1 also needs to be larger, and the external dimensions of the cavity portion 1 are naturally larger.

[0034] In a specific embodiment of the present invention, a first groove 101 and a second groove 102 are provided on the inner wall of the cavity portion 1. Both the first groove 101 and the second groove 102 are recessed toward the outside of the cavity portion 1. This creates a larger space for mounting the transmission output gear. In this case, the interior of the cavity portion 1 can be made smaller, as long as it can accommodate the differential. Since the interior of the cavity portion 1 is smaller, the overall dimensions of the cavity portion 1 are correspondingly smaller, and the weight of the cavity portion 1 is also lighter, which can reduce vehicle energy consumption and improve vehicle trafficability.

[0035] To help the car escape, a differential lock is usually installed on the drive axle. The differential lock fork and the differential lock fork shaft are both located on one side of the inner cavity of the chamber portion 1. The differential lock fork shaft and the differential lock fork will move during operation, so the interior of the chamber portion 1 needs to have corresponding movement space. When designing the inner cavity of the chamber portion 1, in addition to considering the external dimensions of the transmission output gear, the movement space of the differential lock fork and the differential lock fork shaft must also be considered. This will result in a larger inner cavity of the chamber portion 1.

[0036] In this embodiment of the present invention, a third groove 103 is provided on the inner wall of the chamber portion 1 on one side in the axial direction of the shaft tube 2. The third groove 103 is recessed outward relative to the inner wall of the chamber portion 1, thereby forming a movable space 403 for the differential lock fork and the differential lock fork shaft. This eliminates the need to oversize the interior of the chamber portion 1, further reducing the size and weight of the chamber portion 1.

[0037] The upper outer wall of the cavity portion 1 has a first plane cut surface 104, and the lower outer wall of the cavity portion 1 has a second plane cut surface 105. The vertical diameter line of the cavity portion 1 is perpendicular to the first plane cut surface 104 and the second plane cut surface 105. The distance between the first plane cut surface 104 and the second plane cut surface 105 is a first threshold value. The diameter of the circumscribed circle of the projection of the cavity portion 1 in the vertical plane is a second threshold value, and the first threshold value is smaller than the second threshold value. The projection of the traditional cavity portion 1 in the vertical plane is a circle. This specific embodiment is equivalent to using a horizontal plane to cut off the upper and lower ends of the circular outer contour of the traditional cavity portion, thereby forming the first plane cut surface 104 and the second plane cut surface 105. In this way, the distance between the cavity portion 1 and the chassis is increased at the top, which is beneficial to the layout of the chassis. On the other hand, the distance between the cavity portion 1 and the ground is increased at the bottom, which improves the vehicle's passability.

[0038] In the axial direction of the shaft tube 2, the first and second curved surfaces are connected to the left and right sides of the first planar cut surface 104, respectively. The third and fourth curved surfaces are connected to the left and right sides of the second planar cut surface 105, respectively. In the actual design process, the dimensions of the first and second planar cut surfaces 104 and 105, as well as the corresponding diameters of the first, second, third, and fourth curved surfaces, can be set according to specific circumstances.

[0039] Please refer to the attached Figure 3 and attached Figure 4 In the axial direction of the chamber portion 1, that is, in a direction perpendicular to the axis of the shaft tube 2 in a horizontal plane, the chamber portion 1 has a first port 108 and a second port 111. The gearbox 6 enters the inner cavity of the chamber portion 1 through the first port 108 and extends out from the second port 111 of the chamber portion 1. In this specific embodiment, a first flange 109 is welded around the first port 108, and a second flange 112 is welded around the second port 111. The provision of the first flange 109 and the second flange 112 improves the structural strength of the chamber portion 1. The first flange 109 cooperates with the flange of the gearbox 6. A first bolt hole 110 is provided on the first flange 109, and an internally threaded blind hole is provided on the flange of the gearbox 6. The internally threaded blind hole is used in conjunction with the first bolt hole 110. That is, the bolt passes through the first bolt hole 110 and is screwed into the internally threaded blind hole.

[0040] The second flange 112 mates with the flange of the rear cover 4. The rear cover 4 is used to cover the protruding end of the transmission case 6. A second bolt hole 113 is provided on the second flange 112, and a third bolt hole mates with the second bolt hole 113 on the flange of the rear cover 4. Bolts pass through the third bolt hole and are screwed into the second bolt hole 113. The rear cover 4 not only protects the protruding end of the transmission case 6 but also forms a closed space within the chamber 1, facilitating the injection of lubricating oil.

[0041] As can be seen from the above description, on the first flange 109 side, the hole on the flange of the gearbox 6 is an internally threaded blind hole, making it impossible to insert a bolt into the internally threaded blind hole from the first flange 109 side. The first bolt hole 110 on the first flange 109 communicates with the inner cavity of the cavity portion 1. Therefore, it is possible to extend into the cavity portion 1 from the second flange 112 side, that is, from the second port 111, and insert a bolt into the first bolt hole 110 within the inner cavity of the cavity portion 1, and then screw the bolt into the internally threaded blind hole. However, the inner cavity space of the cavity portion 1 is limited, and the bolt locking tool used to tighten the bolt will be interfered with by the inner wall of the cavity portion 1, making it impossible to tighten the bolt. To this end, in this specific embodiment, a through hole 114 is provided on the second flange 112. This through hole 114 communicates with the inner cavity of the cavity portion 1 and the first bolt hole 110, and is coaxially arranged with the first bolt hole 110 on the first flange 109. Through hole 114 is for the bolt locking tool to pass through. On one side of the second port 111 , the bolt locking tool extends into the inner cavity of the chamber portion 1 through the through hole 114 , and then inserts the bolt into the first bolt hole 110 . The bolt locking tool then rotates to screw the bolt into the internal threaded blind hole.

[0042] In this specific embodiment, the bolts connecting the first flange 109 and the flange of the transmission case 6 are built into the cavity 1 and are not exposed. This prevents them from being impacted by external components, thereby improving the stability of the connection. Furthermore, since the bolts are not exposed, the overall dimensions of the cavity 1 can be avoided from increasing. Secondly, the side of the transmission case 6 flange facing the first flange 109 requires machining to align with the first flange 109. However, the side of the transmission case 6 flange facing away from the first flange 109 does not require machining, as it does not need to abut the bolt heads, thus simplifying the machining process. Furthermore, the bolt heads connecting the first flange 109 and the transmission case 6 flange abut the inner end surface of the first flange 109, rather than the transmission case 6 flange. Therefore, the transmission case 6 flange is not subjected to the tightening force of the bolt heads, making it less susceptible to deformation, further improving the stability of the connection.

[0043] In this embodiment of the present invention, a first stopper 107 is provided at the edge of the first port 108 of the chamber 1. This first stopper 107 is arranged around the axis of the chamber 1 and is an annular stopper. The gearbox 6 is provided with a second stopper, also annular, that fits within the first stopper 107. When the gearbox 6 is inserted into the chamber 1, the first stopper 107 and the second stopper form a tight fit, constraining the gearbox 6 and preventing it from moving.

[0044] As can be seen from the above description, the outer dimensions of the chamber portion 1 in the present invention are relatively small, so the dimensions of the first flange 109 are correspondingly smaller. Therefore, it is not possible to provide a large number of first bolt holes 110 on the first flange 109, resulting in a small number of bolts connecting the first flange 109 to the flange of the transmission 6. However, in this specific embodiment, the cooperation between the second stop and the first stop 107 forms a constraint on the transmission 6, so the second stop and the first stop 107 can help the bolts securely fix the transmission 6.

[0045] Please refer to the attached Figure 5 and attached Figure 6 A third stopper 405 is provided on the inner wall of the rear cover 4, near the second port 111 of the chamber 1. This annular stopper surrounds the axis of the chamber 1. A fourth stopper is provided on the protruding end of the transmission case 6, mates with the third stopper 405, and fits within the annular structure of the third stopper 405. After the rear cover 4 is installed, the fourth stopper and the third stopper 405 form a tight fit. External forces acting on the transmission case 6 are transmitted to the rear cover 4 via the fourth and third stoppers 405, ensuring force balance across the entire axle housing and preventing deformation.

[0046] In addition, please refer to the attached Figure 3 The first groove 101, the second groove 102 and the third groove 103 extend along the axial direction of the cavity portion 1 to the first port 108, so the first stop 107 is disconnected at the first groove 101, the second groove 102 and the third groove 103, but this does not affect the cooperation between the second stop and the first stop 107.

[0047] Please refer to the attached Figure 1 , Attachment Figure 5 The rear cover 4 is conical, and a differential lock fork cover 401 is integrated on the rear cover 4. The differential lock fork cover 401 is used to set the differential lock fork and the differential lock fork shaft. The differential lock fork shaft drives the differential lock fork to move, thereby locking and unlocking the differential. The differential lock fork cover 401 includes a flat shell plate 404, and the flat shell plate 404 is used to fix the differential lock cylinder. The differential lock cylinder is located outside the differential lock fork cover 401. The piston of the cylinder penetrates the flat shell plate 404 and extends into the differential lock fork cover 401, and is connected to the differential lock fork shaft. When the wheels on one side of the vehicle slip, the differential lock fork shaft can be driven to move by the differential lock cylinder to drive the fork to move, thereby locking the differential, realizing the linkage of the left and right half shafts, and helping the vehicle to get out of trouble. In addition, the technical solution of integrating the differential lock fork cover 401 on the rear cover 4 , or integrating the rear cover 4 and the differential lock fork cover 401 into an integrated molding design, reduces the overall external dimensions of the rear cover 4 .

[0048] As can be seen from the above description, the rear cover 4 seals the second port 111 of the chamber 1, and the flange of the gearbox 6 seals the first port 108 of the chamber 1. Lubricating oil is injected into the chamber 1 to ensure stable operation of the internal components. In addition, as can be seen from the above description, the internal cavity of the chamber 1 in the present invention is relatively small. In order to prevent the air pressure inside the chamber 1 from being too high, a specific embodiment of the present invention provides a vent hole 115 on the cavity wall of the chamber 1. Please refer to the attached figure. Figure 7 , the vent hole 115 connects the inner cavity of the cavity portion 1 with the outside, and the vent hole 115 is preferably arranged at the upper part of the cavity portion 1. A vent plug 116 is arranged in the vent hole 115, and the vent plug 116 extends into the inner cavity of the cavity portion 1. Preferably, the vent plug 116 is screwed into the vent hole 115. An oil baffle plate 117 is connected to the inner wall of the cavity portion 1 and close to the vent plug 116. The plate surface on one side of the oil baffle plate 117 is opposite to the vent plug 116, and there is a certain space between the vent plug 116 and the oil baffle plate 117. The gas in the cavity portion 1 can go around from the edge of the oil baffle plate 117 to between the oil baffle plate 117 and the vent plug 116, and finally flow to the outside through the vent plug 116. However, the lubricating oil in the chamber portion 1 is blocked by the oil baffle plate 117 and cannot enter between the oil baffle plate 117 and the vent plug 116 and leak out from the vent plug 116 .

[0049] Please continue to refer to the attached Figure 7 The oil baffle 117 specifically comprises an oil baffle body and a connecting plate. The oil baffle body is positioned opposite the vent plug 116, and the connecting plate is connected to one side of the oil baffle body, forming an L-shape with the oil baffle body. The side of the connecting plate facing away from the oil baffle body is connected to the inner wall of the chamber 1. The connecting plate not only facilitates the connection between the oil baffle body and the chamber 1, but also blocks the lubricating oil, making it less likely to leak from the vent plug 116.

[0050] In addition, the present invention is specifically implemented by providing an oil filling hole 406 on the rear cover 4, through which lubricating oil is injected into the inner cavity of the cavity 1. At the same time, an oil drain hole 106 is provided on the cavity 1 to facilitate the discharge of lubricating oil.

[0051] One end of the shaft tube 2 is connected to the cavity part 1, and the other end is used to install the hub bearing. Therefore, the processing accuracy of the shaft tube 2 is relatively high, so it is impossible to make the cavity part 1 and the shaft tube 2 integrally processed. For this reason, the present invention limits the shaft tube 2 to be connected to the cavity part 1 through the connecting part 3. Please refer to the attached Figure 1 and attached Figure 8The connecting portion 3 is integrally formed with the cavity portion 1, while the axle tube 2 is separately machined and then welded to the end of the connecting portion 3 away from the cavity portion 1. Two connecting portions 3 are provided, one on each side of the cavity portion 1, with an axle tube 2 welded to the end of each connecting portion 3. A leaf spring seat is provided on the connecting portion 3, which is connected to the vehicle's leaf spring. A brake connecting plate is also provided on the connecting portion 3, which is used to connect to the brake, which can be a drum brake or a disc brake.

[0052] Since the axle tube 2 supports the wheel, the axle tube 2 needs to bear the force of the wheel. In order to prevent the axle tube 2 from breaking at the weld with the connecting part 3, a specific embodiment of the utility model provides a axle tube lining ring 5 in the axle tube 2. The outer surface of the axle tube lining ring 5 abuts on the weld between the axle tube 2 and the connecting part 3. This is equivalent to reinforcing the weld between the axle tube 2 and the connecting part 3, effectively preventing the axle tube 2 from breaking at the weld.

[0053] Please refer to the attached Figure 9 The cavity portion 1 in the specific embodiment of the present invention is not centrally arranged, but deviates from the central axis of the electric drive axle housing in the axial direction of the shaft tube 2, and deviates to the opposite side of the motor 7 relative to the central axis of the electric drive axle housing. The motor 7 is connected to the gearbox 6, and in the axial direction of the shaft tube 2, the motor 7 is located on one side of the gearbox 6. The central axis of the electric drive axle housing is located in the middle of the left and right wheel hubs. In the attached Figure 9 The middle cavity portion 1 is offset to the left by amm, which will form a larger space on the right side. The space on the right side is used to arrange the frame. The larger space on the right side can be compatible with more styles of frames, and at the same time can ensure that the frame will not interfere with the motor 7.

[0054] In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "horizontal", "center", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0055] Furthermore, the use of terms such as "horizontal," "vertical," and "perpendicular" does not necessarily mean that the component must be absolutely horizontal or vertical, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0056] In addition, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0057] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric drive axle housing, comprising a cavity portion (1) and an axle tube (2), characterized in that: A first groove (101) and a second groove (102) are provided on the inner wall of the cavity portion (1); the first groove (101) and the second groove (102) are arranged relative to each other in a direction perpendicular to the axis of the shaft tube (2); the first groove (101) and the second groove (102) are both recessed outward relative to the inner wall of the cavity portion (1); the first groove (101) and the second groove (102) enclose a transmission output gear installation space; In the axial direction of the shaft tube (2), a third groove (103) is provided on the inner wall of one side of the cavity portion (1), the third groove (103) being recessed outward relative to the inner wall of the cavity portion (1), and the third groove (103) being used to avoid the differential lock fork and the differential lock fork shaft.

2. The electric drive axle housing according to claim 1, characterized in that: The outer wall of the cavity portion (1) has a first plane section (104) and a second plane section (105) arranged opposite to each other, a vertical diameter line of the cavity portion (1) is perpendicular to the first plane section (104) and the second plane section (105), a distance between the first plane section (104) and the second plane section (105) is a first threshold value, a diameter of a circumscribed circle of a projection of the cavity portion (1) in a vertical plane is a second threshold value, and the first threshold value is smaller than the second threshold value.

3. The electric drive axle housing according to claim 1, characterized in that: In the axial direction of the cavity portion (1), the cavity portion (1) has a first port (108) and a second port (111), a first flange (109) is welded around the first port (108), and a second flange (112) is welded around the second port (111), the first flange (109) cooperates with the flange of the gearbox (6), a first bolt hole (110) is provided on the first flange (109), and an internal threaded blind hole that cooperates with the first bolt hole (110) is provided on the flange of the gearbox (6); The second flange (112) cooperates with the flange (402) of the rear cover (4), and the rear cover (4) is used to cover the protruding end of the gearbox (6). The second flange (112) is provided with a second bolt hole (113), and the flange (402) of the rear cover (4) is provided with a third bolt hole that cooperates with the second bolt hole (113). The second flange (112) is also provided with a through hole (114) coaxially arranged with the first bolt hole (110), and the through hole (114) is communicated with the first bolt hole (110). The through hole (114) is for a bolt locking tool to pass through, and the bolt locking tool is used to lock the bolt in the first bolt hole (110) and the internal threaded blind hole.

4. The electric drive axle housing according to claim 3, characterized in that: A first stop (107) is provided at the first port (108), the first stop (107) being arranged around the axis of the cavity portion (1), and a second stop fitted into the first stop (107) is provided on the gearbox (6).

5. The electric drive axle housing according to claim 3, characterized in that: A third stop (405) is provided on the inner wall of the rear cover (4), and the third stop (405) is arranged around the axis of the cavity portion (1). The gearbox (6) is provided with a fourth stop that fits within the third stop (405).

6. The electric drive axle housing according to claim 3, characterized in that: A differential lock fork cover (401) is integrated on the rear cover (4), wherein the differential lock fork and the differential lock fork shaft are arranged in the differential lock fork cover (401), and the differential lock fork cover (401) comprises a flat shell plate (404), wherein the flat shell plate (404) is used to fix the cylinder of the differential lock, and the piston of the cylinder passes through the flat shell plate (404) and is connected to the differential lock fork shaft.

7. The electric drive axle housing according to claim 1, characterized in that: A vent hole (115) is provided on the cavity wall of the cavity portion (1), the vent hole (115) connects the inner cavity of the cavity portion (1) with the outside, a vent plug (116) is provided in the vent hole (115), and the vent plug (116) extends into the inner cavity of the cavity portion (1); an oil baffle plate (117) is connected to the inner wall of the cavity portion (1), a plate surface on one side of the oil baffle plate (117) is opposite to the vent plug (116), and a space is provided between the oil baffle plate (117) and the vent plug (116).

8. The electric drive axle housing according to claim 1, characterized in that: The shaft tube (2) is connected to the cavity portion (1) via a connecting portion (3), the shaft tube (2) is welded to the end of the connecting portion (3), a shaft tube bushing (5) is provided inside the shaft tube (2), and the outer surface of the shaft tube bushing (5) abuts against the weld between the shaft tube (2) and the connecting portion (3).

9. The electric drive axle housing according to claim 1, characterized in that: The gearbox (6) is connected to a motor (7). In the axial direction of the shaft tube (2), the motor (7) is located on one side of the gearbox (6). The central axis of the cavity portion (1) is along the axial direction of the shaft tube (2) and deviates from the central axis of the electric drive axle housing toward the opposite side of the motor (7).

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