Bogie driving device assembly method, assembly tool set, bogie and vehicle

Abstract

The embodiment of the invention provides a bogie driving device assembling method, an assembling tool set, a bogie and a vehicle, and the assembling method comprises the steps that a bolt bush and a bolt are sequentially inserted into corresponding mounting holes of a motor flange and a gearbox flange from front to back; a front cover is inserted between the gearbox flange and the traction motor flange, and the motor flange and the gearbox flange are axially and radially limited by the front cover from the front end; a rear cover and a nut are sequentially installed at the rear end of the gearbox flange, the gearbox flange is limited by the rear cover in the axial direction and the radial direction from the rear end, the nut and the bolt are tightened from the rear end, and therefore the gearbox and the traction motor are in rigid connection; the gearbox and the traction motor are integrally moved through the moving platform, and installation of the traction motor and the bogie frame is completed; the nut, the front cover and the rear cover are detached, and then the gearbox gland and the nut are sequentially installed at the rear end of the gearbox flange; and the gear box is connected with the bogie frame. According to the technical scheme provided by the embodiment of the invention, the assembly efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to bogie assembly technology, in particular to a bogie drive assembly method, an assembly tool set, a bogie and a vehicle. BACKGROUND

[0002] The bogie is an important component of a railway vehicle, which is used to bear the vehicle body and realize the functions of traction running and steering. In recent years, the built-in axle box bogie has been more and more applied due to its compact structure and good performance. The power bogie is provided with a traction motor and a gear box driving wheel pair to rotate and realize running, wherein the traction motor is hung on the frame of the bogie, the output shaft of the traction motor is connected with the gear box, and the gear box is coaxially connected with the axle.

[0003] In one scheme, the traction motor and the gear box are connected through an elastic element to buffer and adapt the relative operation therebetween, and a small structure drum gear coupling can realize the decoupling of torque transmission and movement between the two. However, due to the existence of the elastic element, the traction motor and the gear box have relative movement during the overall installation to the frame, so that the assembly between the two becomes extremely difficult, and the connection of the traction motor and the frame end can be adjusted only after the connection between the traction motor and the gear box is completed, which increases the assembly difficulty of the drive device and reduces the assembly efficiency. SUMMARY

[0004] In order to solve one of the above technical defects, the bogie drive assembly method, the assembly tool set, the bogie and the vehicle are provided in the embodiments of the present application.

[0005] According to a first aspect of the embodiments of the present application, a bogie drive assembly method is provided, comprising: The elastic node is installed into the mounting hole of the gear box flange; The bolt bushing and the bolt are sequentially inserted into the corresponding mounting holes of the motor flange and the gear box flange from front to back, and the bolt is threaded out from the rear end of the gear box flange away from the motor flange; The front cover is inserted between the gear box flange and the traction motor flange, and the front cover is axially and radially limited to the motor flange and the gear box flange from the front end; The rear cover and the nut are sequentially installed at the rear end of the gear box flange, the rear cover is axially and radially limited to the gear box flange from the rear end, and the nut is tightened with the bolt from the rear end, so that the gear box and the traction motor are rigidly connected; The gear box and the traction motor are integrally moved by the moving platform to complete the installation of the traction motor and the bogie frame; The nut, the front cover and the rear cover are removed, and then the gear box gland and the nut are sequentially installed at the rear end of the gear box flange; The gear box is connected with the bogie frame.

[0006] According to a second aspect of the embodiments of the present application, a mounting tool set applied to the bogie drive device mounting method is provided, comprising: The front cover has opposite front and rear end faces, and outer and inner side faces connecting between the front and rear end faces; the inner side face of the front cover is provided with a first protruding part protruding radially inward, which is used for being inserted between the motor flange and the elastic node, and the front side surface of the first protruding part is used for being attached to the rear side surface of the motor flange; the front end face of the front cover is provided with a second protruding part protruding axially toward the front end, which is used for being attached to the outer peripheral surface of the motor flange; the inner side of the front cover is provided with a third protruding part protruding axially toward the rear end, which is used for being inserted into the mounting hole of the gear box flange and being attached to the inner wall of the mounting hole. The rear cover has a central hole into which a bolt can be inserted; the rear cover has opposite front and rear end faces, and the front end face of the rear cover extends toward the front end to form a fourth protruding part, which is used for being inserted into the mounting hole of the gear box flange and being attached to the inner wall of the mounting hole.

[0007] According to a third aspect of the embodiments of the present application, a bogie is provided, which is mounted by using the bogie drive device mounting method.

[0008] According to a fourth aspect of the embodiments of the present application, a vehicle is provided, which comprises the bogie described above.

[0009] The technical scheme provided by the embodiments of the present application loads the elastic node into the mounting hole of the gear box flange; inserts the bolt bushing and the bolt into the corresponding mounting holes of the motor flange and the gear box flange in sequence from front to back, and the bolt is inserted out of the rear end of the gear box flange away from the traction motor flange; inserts the front cover between the gear box flange and the traction motor flange, and the front cover limits the motor flange and the gear box flange in the axial and radial directions from the front end; loads the rear cover and the nut into the rear end of the gear box flange in sequence, and the rear cover limits the gear box flange in the axial and radial directions from the rear end; and tightens the nut with the bolt from the rear end to rigidly connect the gear box and the traction motor; moves the gear box and the traction motor as a whole by using the moving platform to complete the installation of the traction motor and the bogie frame; removes the nut, the front cover and the rear cover, and loads the gear box gland and the nut into the rear end of the gear box flange in sequence; connects the gear box and the bogie frame; rigidly connects the traction motor and the gear box by using the front cover and the rear cover first to avoid relative movement between the two, then completes the connection of the traction motor and the frame, removes the front cover and the rear cover, and then completes the connection of the gear box and the frame, which reduces the number of operations for repeatedly positioning the traction motor and the gear box, greatly reduces the assembly difficulty, and improves the assembly efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0010] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings: Figure 1 A structure schematic view of a front cover in an assembly tool set provided for an embodiment of the application; Figure 2 A structure schematic view of a rear cover in an assembly tool set provided for an embodiment of the application; Figure 3 A flow chart of an assembly method of a bogie driving device provided for an embodiment of the application; Figure 4 A structure schematic view of installing a front cover and a rear cover in an assembly method of a bogie driving device provided for an embodiment of the application; Figure 5 A structure schematic view of a front cover in an assembly tool set provided for an embodiment of the application; Figure 4 A zoomed view of area A in the structure schematic view of the front cover; Figure 6 A structure schematic view of installing a traction motor and a frame by a moving platform in an assembly method of a bogie driving device provided for an embodiment of the application; Figure 7 A structure schematic view of removing a front cover and a rear cover and connecting a gear box and a frame in an assembly method of a bogie driving device provided for an embodiment of the application; Figure 8 A structure schematic view of a rear cover in an assembly tool set provided for an embodiment of the application; Figure 7 A zoomed view of area B in the structure schematic view of the rear cover; Figure 9 A structure schematic view of a traction motor and a gear box provided for an embodiment of the application.

[0011] Reference signs: 1 - traction motor; 11 - motor flange; 12 - hanging installation hole; 13 - motor hanging point; 14 - anti-falling structure; 2 - gear box; 21 - gear box flange; 22 - gear box gland; 23 - gear box hanger; 3 - front cover; 31 - first protruding part; 32 - second protruding part; 33 - third protruding part; 4 - rear cover; 41 - center hole; 42 - fourth protruding part; 5 - frame; 51 - anti-falling hanger; 61 - metal outer ring; 62 - middle rubber ring; 63 - metal inner ring; 71 - bolt; 72 - bolt bushing; 73 - gland; 74 - nut; 75 - bolt gasket; 8 - moving platform. DETAILED DESCRIPTION

[0012] In order to make the technical solutions and advantages of the embodiments of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0013] Conventional drive device scheme: the relative height of the forward motor and the gear box is determined by the vertical positioning reference located on the traction motor and the gear box, and the vertical relative position of the traction motor and the gear box can be controlled by a tooling with a certain height difference. However, due to the complex structure of the gear box and the rigid connection of the gear box to the axle, the vertical reference position height of the gear box is relative to the track surface. Since the wheel tread is a curved surface with a certain taper, it is extremely difficult to determine the track surface when the wheelset and the gear box are placed on the tooling, resulting in that the relative vertical height of the traction motor and the gear box is realized by repeated measurement and adjustment.

[0014] To solve the above problems, the present embodiment provides an assembly tooling set and a method for assembling a bogie drive device using the assembly tooling set. The drive device includes a traction motor 1 and a gear box 2, and the output shaft of the traction motor 1 is connected to the gear box 2 through a shaft coupling. The traction motor 1 is provided with a motor flange 11, and the gear box 2 is provided with a gear box flange 21. The motor flange 11 and the gear box flange 21 are connected through bolts and elastic nodes.

[0015] As shown in Figures 1 to 8 , the assembly method provided by the present embodiment includes: Step 101, inserting an elastic node into the mounting hole of the gear box flange.

[0016] The elastic node includes a metal outer ring 61, a middle rubber ring 62 and a metal inner ring 63 arranged in sequence from outside to inside. The elastic node is installed in the gear box flange 21, and a pressing sleeve is arranged between the elastic node and the gear box flange 21. The pressing sleeve is in pressing connection with the metal outer ring 61 and the gear box flange 21.

[0017] Step 102, inserting a bolt bushing and a bolt into the corresponding mounting holes of the motor flange and the gear box flange from front to back in sequence, and the bolt passes out from the rear end of the gear box flange away from the traction motor flange.

[0018] Figure 4 And Figure 5 , the left end of the figure is the front, and the right end of the figure is the rear. The bolt bushing 72 and the bolt 71 are inserted into the corresponding mounting holes of the motor flange 11 and the gear box flange 21 from left to right in sequence, and the bolt 71 passes out from the right end of the gear box flange 21.

[0019] Step 103, insert the front cover between the gear box flange and the traction motor flange, and limit the axial and radial movement of the motor flange and the gear box flange from the front end.

[0020] Insert the front cover 3 between the gear box flange 11 and the traction motor flange 21, which can limit the relative movement between the gear box flange 11 and the traction motor flange 21 in the axial direction, and also limit the relative movement between the gear box flange 11 and the traction motor flange 21 in the radial direction.

[0021] Step 104, sequentially install the rear cover and nut at the rear end of the gear box flange, and limit the axial and radial movement of the gear box flange from the rear end, and tighten the nut from the rear end with the bolt to rigidly connect the gear box and the traction motor.

[0022] Insert the rear cover 4, bolt washer 75 and nut 74 at the rear end of the gear box flange 21, and limit the axial movement of the gear box flange 21 from the rear end, and also limit the radial movement of the gear box flange 21. Tighten the nut 74 from the rear end with the bolt 71 to rigidly connect the gear box and the traction motor as a whole, and no relative movement between them.

[0023] Step 105, move the gear box and traction motor as a whole by moving the platform to complete the installation of the traction motor and the bogie frame.

[0024] After the above step 104 is completed, the traction motor 1 and the gear box 2 are fixed on the moving platform 8, and the traction motor 1 and the gear box 2 are moved by the moving platform 8, and the traction motor 1 is connected to the frame 5, as shown in Figure 6 .

[0025] Step 106, remove the nut, front cover and rear cover, and then sequentially install the gear box gland and nut at the rear end of the gear box flange.

[0026] As shown in Figure 7 and Figure 8 , after the installation of the traction motor 1 and the frame 5 is completed, the nut 74 is removed, and the pressing action of the front cover 3 and the rear cover 4 is released. Then the front cover 3 and the rear cover 4 are removed, and then the gear box gland 22 is installed at the rear end of the gear box flange 21, and finally the nut 74 is installed back on the bolt 71 and tightened. This step releases the rigid connection between the traction motor 1 and the gear box 2, so that the connection point between them returns to the state of elastic deformation, to buffer the stress at the connection point between them.

[0027] Step 107, connect the gear box to the bogie frame.

[0028] Then, move the gear box 2 by the moving platform 8, connect the gear box 2 to the frame 5, and complete the assembly of the drive device.

[0029] The technical scheme provided by the embodiment is characterized in that: an elastic node is arranged in the mounting hole of the gear box flange; the bolt bushing and the bolt are sequentially inserted into the corresponding mounting holes of the motor flange and the gear box flange from front to back, the bolt is threaded out from the rear end of the gear box flange away from the traction motor flange; the front cover is inserted between the gear box flange and the traction motor flange, the front cover is limited in the axial and radial directions from the front end to the motor flange and the gear box flange; the rear cover and the nut are sequentially arranged at the rear end of the gear box flange, the rear cover is limited in the axial and radial directions from the rear end to the gear box flange, and the nut is screwed with the bolt from the rear end, so that the gear box and the traction motor are rigidly connected; the gear box and the traction motor are integrally moved through the moving platform, and the traction motor and the bogie frame are installed; the nut, the front cover and the rear cover are removed, and then the gear box gland and the nut are sequentially arranged at the rear end of the gear box flange; the gear box is connected with the bogie frame; the traction motor and the gear box are first rigidly connected by using the front cover and the rear cover to avoid relative movement between the two, then the connection between the traction motor and the frame is completed, and then the front cover and the rear cover are removed, and finally the connection between the gear box and the frame is completed, thereby reducing the number of repeated alignment operations on the traction motor and the gear box, greatly reducing the assembly difficulty and improving the assembly efficiency.

[0030] On the basis of the above technical scheme, an embodiment of the front cover 3 is provided, as shown in Figure 1 The front cover 3 is a ring structure, which can be a whole ring structure or formed by two half-ring structures, and the two half-ring structures are symmetrically arranged. The two half-ring structures are respectively inserted between the motor flange 11 and the gear box flange 21 along the radial direction from both sides, and the front cover 3 is axially compressed by tightening the nut 74. During disassembly, as long as the nut 74 is loosened, the front cover 3 can be easily removed without extracting the bolt 71, which is convenient and fast.

[0031] Taking the two half-ring structures as an example, the front cover 3 has opposite front and rear end faces, and outer and inner side faces connecting the front and rear end faces. The inner side face of the front cover 3 is provided with a first protrusion 31 protruding inward along the radial direction, the first protrusion 31 is used for being inserted between the motor flange 11 and the elastic node, and the front side surface of the first protrusion 31 is used for being attached to the rear side surface of the motor flange 11. The front end face of the front cover 3 is provided with a second protrusion 32 protruding forward along the axial direction, the second protrusion 32 is used for being attached to the outer peripheral surface of the motor flange 11. The inner side face of the front cover 3 is provided with a third protrusion 33 protruding rearward along the axial direction, the third protrusion 33 is used for being inserted into the mounting hole of the gear box flange 21 and being attached to the inner wall of the mounting hole.

[0032] In the above scheme, the rear side surface of the front cover 3 is attached to the front side surface of the gear box flange 21, and the front side surface of the first protrusion 21 is used for being attached to the rear side surface of the motor flange 11, thereby achieving the axial limitation between the motor flange 11 and the gear box flange 21.

[0033] The lower surface of the second protrusion 32 is attached to the outer circumferential surface of the motor flange 11, and the upper surface of the third protrusion 33 is attached to the inner wall of the mounting hole of the gearbox flange 21, thereby achieving radial limiting between the motor flange 11 and the gearbox flange 21.

[0034] On the basis of the above technical solution, the embodiment provides an implementation of the rear cover 4, as shown in the figure. Figure 2 The rear cover 4 is circular, and has a central hole 41 in the middle for inserting a bolt. The rear cover 4 has opposite front and rear end faces, and the front end face of the rear cover 4 extends towards the front end to form a fourth protrusion 42, which is inserted into the mounting hole of the gearbox flange 21 and attached to the inner wall of the mounting hole.

[0035] In the above solution, the pressing force generated by tightening the nut 74 causes the front end face of the rear cover 4 to be attached to the rear end face of the gearbox flange 21, thereby achieving axial limiting of the gearbox flange 21.

[0036] The upper surface of the fourth protrusion 42 is attached to the inner wall of the mounting hole of the gearbox flange 21, and the cooperation between the central hole and the bolt 71 is achieved, thereby achieving radial limiting of the gearbox flange 21.

[0037] Further, in the above step 105, the gearbox 2 and the traction motor 1 are moved as a whole by the moving platform to complete the installation of the traction motor 1 and the bogie frame, including:9 First, the traction motor 1 and the gearbox 2 are installed on the moving platform 8, and the gearbox 2 and the traction motor 1 are moved as a whole by the moving platform 8 to the assembly station of the drive device. The drive device is moved as a whole by the moving platform 8 to the center of the hanging mounting hole 12 of the traction motor 1 and the hanging mounting hole on the frame 5, and the bolt is pre-installed in the hanging mounting hole of the traction motor 1 and the hanging mounting hole on the frame 5.

[0038] The hanging mounting hole 12 of the traction motor 1 is circular, the gearbox 2 and the traction motor 1 are moved as a whole by the moving platform 8 to the center of the anti-falling hole of the traction motor 1 and the center hole of the anti-falling hanger on the frame 5, the traction motor 1 is constrained by the anti-falling hanger on the frame 5 to prevent the traction motor from falling due to the failure of the connection structure of the traction motor and the frame. Then, the bolts in the hanging mounting hole of the traction motor 1 and the hanging mounting hole on the frame 5 are tightened, and the connection between the traction motor 1 and the frame 5 is completed.

[0039] In the above process, the traction motor 1 and the gearbox 2 are always rigidly connected. After completing the assembly of the traction motor 1 and the frame 5, loosen and remove the nut 74, and then remove the bolt washer 75, the rear cover 4, the front cover 3, the gearbox gland 22, the bolt washer 75 and the nut 74 in sequence, and then tighten the nut 74.

[0040] Then connect gearbox 2 to frame 5. First, install an elastic node at one end of the gearbox rod and connect it to gearbox 2. Then, install an elastic node at the other end of the gearbox rod and connect it to frame 5 to complete the connection between gearbox 2 and frame.

[0041] like Figure 9 As shown, gearbox 2 is connected to frame 5 via gearbox suspension rod 23, and traction motor 1 is connected to frame 5 via motor suspension point 13. Traction motor 1 is connected to frame 5 via anti-detachment structure 14. Based on the above technical solution, the bogie obtained by applying the above assembly method has the same technical effect as the above method.

[0042] This embodiment also provides a vehicle, specifically a rail vehicle, including the aforementioned bogie.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that such additions and modifications be included within the scope of the application. It is the following claims, including any amendments thereto, which define the scope of the application.

[0047] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for assembling a bogie drive unit, characterized in that, include: Insert a flexible joint into the mounting hole of the gearbox flange; Insert the bolt bushing and bolts into the corresponding mounting holes of the motor flange and gearbox flange from front to back, and let the bolts pass out from the rear end of the gearbox flange away from the traction motor flange. A front cover is inserted between the gearbox flange and the traction motor flange. The front cover limits the motor flange and the gearbox flange axially and radially from the front end. Install the rear cover and nut in sequence at the rear end of the gearbox flange. The rear cover limits the gearbox flange axially and radially from the rear end. Tighten the nut with the bolt from the rear end to make the gearbox and traction motor rigidly connected. The gearbox and traction motor are moved as a whole by a mobile platform to complete the installation of the traction motor and bogie frame. Remove the nuts, front cover, and rear cover, and then install the gearbox cover and nuts into the rear end of the gearbox flange in sequence. Connect the gearbox to the bogie frame.

2. The method according to claim 1, characterized in that, In the step of inserting a front cover between the gearbox flange and the traction motor flange, and limiting the motor flange and gearbox flange axially and radially from the front end, the rear surface of the front cover is in contact with the front surface of the gearbox flange; the inner side of the front cover is provided with a first protrusion that protrudes radially inward, the first protrusion is inserted between the motor flange and the elastic node, and the front surface of the first protrusion is in contact with the rear surface of the motor flange, thereby limiting the motor flange and gearbox flange axially. The inner side of the front cover is provided with a second protrusion that protrudes axially towards the front end and is attached to the outer circumferential surface of the motor flange; the inner side of the front cover is provided with a third protrusion that protrudes axially towards the rear end and is inserted into the mounting hole of the gearbox flange and attached to the inner wall of the mounting hole, thereby achieving radial positioning of the motor flange and the gearbox flange.

3. The method according to claim 1 or 2, characterized in that, The front cover consists of two semi-circular rings that move radially toward each other and are inserted between the gearbox flange and the traction motor flange.

4. The method according to claim 1, characterized in that, In the step of sequentially installing the rear cover and nut at the rear end of the gearbox flange, and limiting the gearbox flange axially and radially from the rear end, the front end face of the rear cover is attached to the rear end face of the gearbox flange to achieve axial limiting of the gearbox flange. The rear cover has a central hole in the middle where a bolt can be inserted; the front end face of the rear cover extends towards the front end to form a fourth protrusion, which is inserted into the mounting hole of the gearbox flange and attached to the inner wall of the mounting hole to achieve radial positioning of the gearbox flange.

5. The method according to claim 1, characterized in that, The gearbox and traction motor are moved as a whole using a mobile platform to complete the installation of the traction motor and bogie frame, including: The gearbox and traction motor are moved as a whole using a mobile platform until the hanging mounting hole of the traction motor is concentric with the hanging mounting hole on the frame. Bolts are then pre-installed into the hanging mounting holes of the traction motor and the frame. Using the hanging mounting hole of the traction motor as the center, the gearbox and traction motor are moved as a whole by the moving platform until the anti-detachment hole of the traction motor is concentric with the center hole of the anti-detachment bracket on the frame. Tighten the bolts in the mounting holes of the traction motor and the mounting holes on the frame.

6. The method according to claim 5, characterized in that, Connecting the gearbox to the bogie frame includes: A flexible joint is installed at one end of the gearbox boom and connected to the gearbox; The other end of the gearbox boom is inserted into the elastic node and connected to the frame.

7. An assembly tooling set applied to the assembly method of the bogie drive unit according to any one of claims 1-6, characterized in that, include: The front cover has a front end face and a rear end face, as well as an outer side face and an inner side face connecting the front end face and the rear end face; the inner side face of the front cover is provided with a first protrusion that protrudes radially inward, the first protrusion being used to insert between the motor flange and the elastic node, and the front surface of the first protrusion being used to fit against the rear surface of the motor flange; the front end face of the front cover is provided with a second protrusion that protrudes axially towards the front end, the second protrusion being used to fit against the outer peripheral surface of the motor flange; the inner side of the front cover is provided with a third protrusion that protrudes axially towards the rear end, the third protrusion being used to insert into the mounting hole of the gearbox flange and fit against the inner wall of the mounting hole; The rear cover has a central hole into which a bolt can be inserted; the rear cover has opposing front and rear faces, the front face of the rear cover extending toward the front to form a fourth protrusion, the fourth protrusion being inserted into the mounting hole of the gearbox flange and abutting against the inner wall of the mounting hole.

8. The assembly tooling assembly according to claim 7, characterized in that, The front cover includes two semi-circular rings, which are symmetrically arranged and have a first protrusion, a second protrusion, and a third protrusion.

9. A bogie, characterized in that, The bogie drive unit is assembled using the assembly method of any one of claims 1-6.

10. A vehicle, characterized in that, include: The bogie as described in claim 9.

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