Mining vehicle and electric wheel drive axle assembly thereof

Abstract

The invention discloses an electric wheel drive axle assembly which comprises an axle housing internally provided with an assembling cavity and a motor, an outer spigot is formed in the inner wall of the end of the assembling cavity, and the projection of the outer spigot on the plane perpendicular to the axis of the outer spigot is circular; the outer wall of the end part of the motor is provided with an inner seam allowance, the inner seam allowance is inserted into the outer seam allowance, the inner seam allowance comprises plane supporting sections and cambered surface supporting sections, and the plane supporting sections and the cambered surface supporting sections are alternately arranged in the circumferential direction; puller bolts penetrate through the axle housing and are in threaded connection with the axle housing, the inner end faces of the puller bolts abut against the plane supporting sections in a pressing mode, the number of the puller bolts matched with the same plane supporting section is even, and the projection of the axis of the outer spigot on the plane where the plane supporting sections are located serves as a datum line; the puller bolts matched with the plane supporting section are symmetrically arranged on the two sides of the datum line. The invention further discloses a mining vehicle applying the electric wheel drive axle assembly.

Description

Technical Field

[0001] This invention relates to the technical field of drive axle components for mining machinery, and particularly to an electric wheel drive axle assembly. This invention also relates to a mining vehicle using this electric wheel drive axle assembly. Background Technology

[0002] In recent years, electric wheel-based product designs have been increasingly widely used in mining machinery, especially mining vehicles. Generally, electric wheel products typically assemble the motor and matching axle head assembly and then install the whole into the cavity of the axle housing to match the overall assembly of the drive axle.

[0003] Currently, due to the relatively large axial and radial dimensions of the motors used with electric wheels, the machining accuracy of the shape and coaxiality of the stop structure at the motor mounting position cannot be very high. This poses two problems for the structural design of the stop position on the axle housing used for motor adaptation: On the one hand, if the stop structure is designed as a transition structure or a small-gap adaptation structure, the presence of machining errors will lead to difficulties in disassembling and assembling the component structure during actual assembly. On the other hand, if the stop is designed as a structure with a large clearance fit with the motor, it cannot meet the auxiliary support requirements at the motor end. Especially under extreme vibration conditions, such a structural design will increase the risk of breakage at the motor bolt connection, which will have a significant adverse impact on the overall structural reliability of the motor and even the drive axle.

[0004] Furthermore, during actual operation of the drive axle, when the motor is under high torque conditions, the motor itself has a torsional reaction force. In the current conventional structural design in the industry, this torsional reaction force is only supported by the fitting connection between the motor and the shaft bolts. However, under alternating loads, the continuous application of this torsional reaction force can easily cause the bolts to loosen, resulting in the risk of failure of the corresponding motor mounting structure. At the same time, this condition will also significantly reduce the torsional stiffness of the motor itself, leading to increased torsional deformation of the motor structure, which will adversely affect the working performance of the corresponding drive axle and even affect the stable and reliable operation of the corresponding mining vehicle.

[0005] In view of this, how to optimize the motor mounting structure of the electric wheel drive axle so that the motor can be reliably mounted and positioned and stably supported is an important technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an electric wheel drive axle assembly that provides stable structural support for the motor, enabling reliable installation and positioning of the motor and ensuring its smooth operation. Another purpose of this invention is to provide a mining vehicle using the aforementioned electric wheel drive axle assembly.

[0007] To solve the above technical problems, the present invention provides an electric wheel drive axle assembly, including an axle housing with an internal assembly cavity and a motor disposed in the assembly cavity. The inner wall of the end of the assembly cavity has an outer stop extending circumferentially therein, and the projection of the outer stop on a plane perpendicular to its axis is circular.

[0008] The outer wall of the motor end has an inner stop extending circumferentially therein. The inner stop is fitted into the outer stop. The inner stop includes a planar support section and an arc-shaped support section. The planar support section and the arc-shaped support section are arranged alternately along the circumference of the motor and connected end to end. The projection of the planar support section on a plane perpendicular to the axis of the outer stop is a line segment, and the projection of the arc-shaped support section on a plane perpendicular to the axis of the outer stop is a circular arc.

[0009] The bridge housing has a number of tightening bolts threaded through it radially from the outside to the inside. The inner end face of the tightening bolts is perpendicularly abutted against and pressed against the planar support section. The number of tightening bolts adapted to the same planar support section is even. The projection of the axis of the outer stop on the plane where the planar support section is located is used as the reference line. The tightening bolts adapted to the planar support section are symmetrically arranged on both sides of the reference line.

[0010] Preferably, there are four planar support segments and four arc-shaped support segments, and the projections of each planar support segment onto a plane perpendicular to the axis of the outer stop are of equal length.

[0011] Preferably, the projections of each of the arc-shaped support segments onto a plane perpendicular to the axis of the outer stop are of equal length and have equal central angles.

[0012] Preferably, the axes of the tightening bolts adapted to the same planar support section are located in the same plane perpendicular to the axis of the outer stop.

[0013] Preferably, the axes of the tightening bolts adapted to the same planar support section are parallel to each other.

[0014] Preferably, there are two tightening bolts adapted to the same planar support section.

[0015] Preferably, the two tightening bolts adapted to the same planar support section abut against the two edges of the planar support section symmetrically along the circumference of the motor.

[0016] Preferably, the outer wall of the bridge housing is recessed with a bolt protection groove, and the tightening bolts are inserted one by one into the bolt protection groove, and the outer end face of the tightening bolt does not protrude from the groove opening of the bolt protection groove.

[0017] Preferably, a locking nut is fitted onto the outer end of the tightening bolt, the locking nut being threadedly adapted to the tightening bolt, and the locking nut abutting against and pressing against the outer wall of the bridge housing.

[0018] The present invention also provides a mining vehicle, including a vehicle body, electric wheels mounted on the vehicle body, and an electric wheel drive axle assembly that is connected to the electric wheels via a transmission, wherein the electric wheel drive axle assembly is the electric wheel drive axle assembly as described in any of the preceding claims.

[0019] Compared to the aforementioned background technology, the electric wheel drive axle assembly provided by the present invention, during installation, involves placing the motor into the assembly cavity, with one end of the motor containing the inner stop aligned and inserted with one end of the assembly cavity containing the outer stop, so that the inner and outer stops are aligned and fitted. At this time, although the inner and outer stops cannot fit together completely due to the existence of processing errors, the part or the whole of the arc-shaped support section can still reliably contact and moderately abut against the corresponding part of the outer stop, so as to complete the basic support for the main structure of the motor. Based on this, the tightening bolt is inserted into the axle housing from the outside in and extends into the assembly cavity until the front end of the tightening bolt contacts and reliably abuts against the planar support section. At this point, the abutting fit between the tightening bolt and the planar support section forms a reliable limiting and auxiliary structural support for the motor. Furthermore, the abutting fit between the planar support section and the tightening bolt, combined with the partial or complete fit between the arc-shaped support section and the outer stop, forms a circumferential and radial structural lock for the motor. This achieves structural compensation for machining errors, avoids the problem of insufficient support force caused by large gaps in the assembly between the motor and the axle housing stop, effectively ensures a constant assembly position between the motor and the axle housing, and optimizes the overall assembly strength and structural stability of the electric wheel drive axle assembly. Simultaneously, the abutting fit structure of the tightening bolt can apply reliable clamping force at the planar support section. This clamping force is transmitted to the arc-shaped support section, further increasing the clamping strength between the arc-shaped support section and the outer stop, making the abutting clamping structure between the arc-shaped support section and the outer stop more stable and reliable. This further optimizes the structural support and locking effect of the axle housing on the motor, restricts the torsional freedom of the motor end, reduces the torsional deformation of the motor during operation, thereby significantly improving the structural stability of the motor during operation, and making the overall operation of the electric wheel drive axle assembly more stable and the power transmission smoother and more reliable.

[0020] In another preferred embodiment of the present invention, there are four planar support segments and four arc-shaped support segments, and the projections of each planar support segment on a plane perpendicular to the axis of the outer stop are of equal length. The four planar support segments and four arc-shaped support segments are alternately arranged circumferentially on the outer peripheral wall of the motor, which makes the overall structural distribution of the inner stop more balanced. After the motor and the assembly cavity are installed in place, the tightening bolts are installed in place. At this time, it can be ensured that at least one arc-shaped support segment can always reliably abut and press against the outer stop, forming the main support part for the main structure of the motor. Combined with the abutment and pressing fit between each planar support segment and the tightening bolts, a coordinated locking of the radial and circumferential positions of the motor is formed, ensuring that the fitting clearance between the remaining arc-shaped support segments and the outer stop remains stable. This further avoids large-scale torsion or structural loosening of the motor during operation, improves the operating stability of the motor, optimizes the assembly stress distribution between the motor and the axle housing, and makes the overall operation of the electric wheel drive axle assembly more stable and reliable, and the power output more stable and efficient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an isometric view of the electric wheel drive axle assembly provided in a specific embodiment of the present invention;

[0023] Figure 2 for Figure 1 Cross-sectional view;

[0024] Figure 3 for Figure 1 A schematic diagram of the assembly structure of the center tightening bolt on the bridge housing.

[0025] in:

[0026] 11-bridge housing; 111-assembly cavity; 112-external stop;

[0027] 12-Motor; 120-Inner stop; 121-Flat support section; 122-Arc support section;

[0028] 13-Tightening bolt; 131-Threaded hole; 132-Locking nut; 133-Bolt protection groove. Detailed Implementation

[0029] The core of this invention is to provide an electric wheel drive axle assembly that can provide stable structural support for the motor, realize reliable installation and positioning of the motor, and ensure smooth operation of the motor; in addition, a mining vehicle using the above-mentioned electric wheel drive axle assembly is also provided.

[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In specific implementation methods, in conjunction with references Figure 1 and Figure 2 As shown, the electric wheel drive axle assembly provided by the present invention includes an axle housing 11 with an internal assembly cavity 111 and a motor 12 disposed in the assembly cavity 111. The inner wall of the end of the assembly cavity 111 has an outer stop 112 extending circumferentially therein, and the projection of the outer stop 112 on a plane perpendicular to its axis is circular.

[0032] The outer wall of the end of the motor 12 has an inner stop 120 extending circumferentially therein. The inner stop 120 is fitted into the outer stop 112. The inner stop 120 includes a planar support section 121 and an arc-shaped support section 122. The planar support section 121 and the arc-shaped support section 122 are arranged alternately along the circumference of the motor 12 and are connected end to end. The projection of the planar support section 121 on the plane perpendicular to the axis of the outer stop 112 is a line segment, and the projection of the arc-shaped support section 122 on the plane perpendicular to the axis of the outer stop 112 is a circular arc.

[0033] A number of tightening bolts 13 are threaded through the axle housing 11 from the outside to the inside along its radial direction. The inner end face of the tightening bolt 13 is perpendicularly abutted against and pressed against the planar support section 121. The number of tightening bolts 13 adapted to the same planar support section 121 is even. The projection of the axis of the outer stop 112 onto the plane of the planar support section 121 is used as the reference line. Each tightening bolt 13 adapted to the planar support section 121 is symmetrically arranged on both sides of the reference line.

[0034] During the specific equipment installation, the motor 12 is placed into the assembly cavity 111, with the end of the motor 12 containing the inner stop 120 aligned and inserted with the end of the assembly cavity 111 containing the outer stop 112, so that the inner stop 120 and the outer stop 112 are properly matched. At this time, although the inner stop 120 and the outer stop 112 cannot be completely fitted together due to machining errors, the arc-shaped support section 122 can still reliably contact and moderately abut against the corresponding part of the outer stop 112 to complete the basic support for the main structure of the motor 12.

[0035] Based on this, the tightening bolt 13 is inserted into the axle housing 11 from the outside in and extends into the assembly cavity 111 until the front end face of the tightening bolt 13 contacts and reliably abuts against the planar support section 121. At this time, the abutting fit between the tightening bolt 13 and the planar support section 121 forms a reliable limiting and auxiliary structural support for the motor 12. Furthermore, the abutting fit between the planar support section 121 and the tightening bolt 13, combined with the partial or complete fit between the arc support section 122 and the outer stop 112, forms a circumferential and radial structural lock for the motor 12. This achieves structural compensation for machining errors, avoids the problem of insufficient support force caused by the large gap assembly at the stop fit between the motor 12 and the axle housing 11, effectively ensures the constant assembly position between the motor 12 and the axle housing 11, and optimizes the overall assembly strength and structural stability of the electric wheel drive axle assembly.

[0036] Meanwhile, the mating structure of the tightening bolt 13 can apply reliable clamping force at the planar support section 121. This clamping force is transmitted to the arc-shaped support section 122, further improving the clamping strength between the arc-shaped support section 122 and the outer stop 112, making the clamping structure between the arc-shaped support section 122 and the outer stop 112 more stable and reliable. This further optimizes the structural support and locking effect of the axle housing 11 on the motor 12, restricts the torsional freedom of the motor 12 end, reduces the torsional deformation of the motor 12 during operation, thereby significantly improving the structural stability of the motor 12 during operation, and making the overall operation of the electric wheel drive axle assembly smoother and the power transmission smoother and more reliable.

[0037] It is easy to understand that, in actual assembly, as shown in the figure, threaded holes 131 that can be adapted to the threads of the tightening bolts 13 can be arranged on the axle housing 11 so that the tightening bolts 13 can be inserted into the threaded holes 131 one by one and tightened by threads, so as to achieve reliable assembly between the tightening bolts 13 and the main structure of the axle housing 11; or, positioning through holes for the tightening bolts 13 to be inserted into can be arranged on the axle housing 11, and locking nuts 132 coaxial with the positioning through holes can be arranged at corresponding positions on the outer wall of the axle housing 11 and the inner wall of the assembly cavity 111, so that the threads of the two locking nuts 132 are adapted to the tightening bolts 13, thereby using the two locking nuts 132 located at both ends of the positioning through holes to cooperate and form a two-way clamping and locking of the tightening bolts 13 and the axle housing 11, so as to achieve reliable assembly between the tightening bolts 13 and the main structure of the axle housing 11.

[0038] Of course, based on the alignment and assembly of the tightening bolt 13 using the threaded hole 131, a locking nut 132 can also be fitted onto the tightening bolt 13. This allows for auxiliary tightening and anti-loosening of the tightening bolt 13 through the contact and compression between the locking nut 132 and the axle housing 11. Considering the convenience of disassembly and assembly operations and the efficiency of maintenance in practical applications, as shown in the figure, the locking nut 132 can be fitted only onto the outer end of the tightening bolt 13, and the locking nut 132 can be made to contact and compress against the outer wall of the axle housing 11.

[0039] In practical applications, after comprehensively considering the actual working conditions, an appropriate method can be selected to achieve reliable assembly of the tightening bolt 13 on the bridge housing 11. Of course, considering the assembly conditions under most working conditions and the need to reduce the number of components, it is still advisable to use the threaded hole 131 arranged on the bridge housing 11 as shown in the figure to achieve the alignment and assembly of the tightening bolt 13.

[0040] Specifically, there are four planar support segments 121 and four arc-shaped support segments 122, and the projections of each planar support segment 121 onto the plane perpendicular to the axis of the outer stop 112 are of equal length. Four planar support sections 121 and four arc-shaped support sections 122 are alternately arranged circumferentially on the outer peripheral wall of the motor 12, which makes the overall structural distribution of the inner stop 120 more balanced. After the motor 12 and the assembly cavity 111 are installed in place, each tightening bolt 13 is installed in place. At this time, it can be ensured that at least one arc-shaped support section 122 can always reliably abut and press against the outer stop 112, forming the main support part of the main structure of the motor 12. Combined with the abutting and pressing fit between each planar support section 121 and the tightening bolt 13, a coordinated locking of the radial and circumferential positions of the motor 12 is formed, ensuring that the fitting clearance between the remaining arc-shaped support sections 122 and the outer stop 112 remains stable. This further avoids large torsion or structural loosening of the motor 12 during operation, improves the operating stability of the motor 12, optimizes the assembly stress distribution between the motor 12 and the axle housing 11, and makes the overall operation of the electric wheel drive axle assembly more stable and reliable, and the power output more stable and efficient.

[0041] It is easy to understand that the number of planar support segments 121 and curved support segments 122 is not limited to the four shown in the figure. In practical applications, the specific number of various support segments can be flexibly selected according to specific assembly requirements and working conditions. However, considering the actual assembly strength and the need for simplified component structure, it is still advisable to use four planar support segments 121 and four curved support segments 122 as shown in the figure, and arrange them alternately.

[0042] Accordingly, the projections of each arc-shaped support segment 122 onto the plane perpendicular to the axis of the outer stop 112 are of equal length and have the same central angle. This ensures that the dimensions of each arc-shaped support segment 122 are consistent, which can further optimize the stress distribution after any arc-shaped support segment 122 abuts and adapts to the outer stop 112, and make the overall structural layout of the inner stop 120 more regular.

[0043] On the other hand, the axes of each tightening bolt 13 adapted to the same planar support section 121 are located in the same plane perpendicular to the axis of the outer stop 112. This ensures that the clamping force from the tightening bolt 13 on any planar support section 121 is distributed on the same cross-section perpendicular to the axis, avoiding circumferential and tangential force imbalance in the planar support section 121. This further suppresses the torsional freedom of the motor 12 during operation, reduces torsional deformation of the motor 12 during operation, and consequently makes the overall operation of the electric wheel drive axle assembly smoother and the power output more seamless.

[0044] Furthermore, the axes of the tightening bolts 13 adapted to the same planar support section 121 are parallel to each other. This ensures that the clamping force from the tightening bolts 13 on any planar support section 121 is in the same direction, resulting in more uniform stress on a single planar support section 121. This ensures a more balanced circumferential and tangential force on the motor 12 at any planar support section 121, further optimizing the suppression of the torsional freedom of the motor 12, further reducing torsional deformation of the motor 12 during operation, and thus making the power output of the electric wheel drive axle assembly more stable and smooth during operation.

[0045] Generally, there are two tightening bolts 13 that fit on the same plane support section 121. This allows for the reduction of the number of parts while ensuring that the clamping force on any plane support section 121 is sufficient. This makes the component structure of the electric drive axle assembly simpler and the corresponding equipment assembly structure lighter and more reliable.

[0046] Based on this, two tightening bolts 13 adapted to the same planar support section 121 symmetrically abut against the two edges of the planar support section 121 along the circumference of the motor 12. This makes the distribution of the clamping force on any planar support section 121 more balanced, and the adapting structure abutting against the edges at both ends maximizes the lever arm of the clamping force from the tightening bolts 13 on any planar support section 121. This results in optimal circumferential and tangential limiting effects of the inner stop 120 of the motor 12 at the planar support section 121, ensuring the most ideal restriction effect on the torsional freedom of the motor 12 end, and correspondingly minimizing the torsional deformation amplitude of the motor 12. Therefore, under existing operating conditions, the operational stability and power output smoothness of the electric wheel drive axle assembly can reach their optimal state.

[0047] In addition, key references Figure 3 As shown, a bolt protection groove 133 is recessed on the outer wall of the bridge housing 11. The tightening bolts 13 are inserted into the bolt protection groove 133 one by one and pass through it, and the outer end face of the tightening bolts 13 does not protrude from the groove opening of the bolt protection groove 133. After the tightening bolt 13 is assembled onto the axle housing 11 and the front end face of the tightening bolt 13 is reliably pressed against the corresponding planar support section 121, the outer end of the tightening bolt 13 is located outside the axle housing 11 and within the bolt protection groove 133. This effectively avoids the risk of the outer end of the tightening bolt 13 protruding from the main extension surface of the outer wall of the axle housing 11 and causing structural interference to surrounding components. Especially for the tightening bolt 13 assembled on the bottom outer wall of the axle housing 11, the bolt protection groove 133 can effectively ensure that the bottom outer wall of the axle housing 11 can fully and reliably contact the ground or other support surfaces, ensuring the overall structural stability of the axle housing 11 and even the electric wheel drive axle assembly, and effectively preventing the related assembly structure from bumping or other non-working contacts to the outer end of the tightening bolt 13, thus preventing the outer end of the tightening bolt 13 from being damaged by non-working processes.

[0048] Accordingly, if the threaded hole 131 is matched with the thread of the tightening bolt 13 to achieve reliable assembly of the tightening bolt 13 on the axle housing 11, then each threaded hole 131 is coaxially arranged in each bolt protection groove 133; while if the locking nut 132 is matched with the thread of the tightening bolt 13 to achieve assembly and locking of the deposit nut on the axle housing 11, then the locking nut 132 located on the outside of the main structure of the axle housing 11 is also arranged in the bolt protection groove 133.

[0049] In a specific embodiment, the mining vehicle provided by the present invention includes a vehicle body, electric wheels mounted on the vehicle body, and an electric wheel drive axle assembly connected to the electric wheels. The electric wheel drive axle assembly is as described above. This electric wheel drive axle assembly of the mining vehicle can provide stable structural support for the motor, enabling reliable installation and positioning of the motor and ensuring its smooth operation.

[0050] Of course, the electric wheel drive axle assembly provided in this solution is not limited to mining vehicles. If there are actual working conditions and the assembly space can meet the equipment assembly and adaptation requirements, the electric wheel drive axle assembly provided in this solution can also be assembled and applied to other mining machinery or construction machinery.

[0051] In summary, the electric wheel drive axle assembly provided in this invention, during installation, involves placing the motor into the assembly cavity, aligning and inserting the end of the motor with the end of the assembly cavity containing the inner stop, so that the inner and outer stops are properly matched. At this time, although the inner and outer stops cannot be fully fitted due to machining errors, the part or the whole of the arc-shaped support section can still reliably contact and moderately abut against the corresponding part of the outer stop, thereby completing the basic support for the main structure of the motor. Based on this, the tightening bolt is inserted into the axle housing from the outside in and extends into the assembly cavity until the front end of the tightening bolt contacts and reliably abuts against the planar support section. At this point, the abutting fit between the tightening bolt and the planar support section forms a reliable limiting and auxiliary structural support for the motor. Furthermore, the abutting fit between the planar support section and the tightening bolt, combined with the partial or complete fit between the arc-shaped support section and the outer stop, forms a circumferential and radial structural lock for the motor. This achieves structural compensation for machining errors, avoids the problem of insufficient support force caused by large gaps in the assembly between the motor and the axle housing stop, effectively ensures a constant assembly position between the motor and the axle housing, and optimizes the overall assembly strength and structural stability of the electric wheel drive axle assembly. Simultaneously, the abutting fit structure of the tightening bolt can apply reliable clamping force at the planar support section. This clamping force is transmitted to the arc-shaped support section, further increasing the clamping strength between the arc-shaped support section and the outer stop, making the abutting clamping structure between the arc-shaped support section and the outer stop more stable and reliable. This further optimizes the structural support and locking effect of the axle housing on the motor, restricts the torsional freedom of the motor end, reduces the torsional deformation of the motor during operation, thereby significantly improving the structural stability of the motor during operation, and making the overall operation of the electric wheel drive axle assembly more stable and the power transmission smoother and more reliable.

[0052] The present invention also provides a mining vehicle in which the electric wheel drive axle assembly can provide stable structural support for the motor, realize reliable installation and positioning of the motor, and ensure smooth operation of the motor.

[0053] The electric wheel drive axle assembly and the mining vehicle using this electric wheel drive axle assembly have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the invention. It should be noted that those skilled in the art can make several improvements and modifications to the invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the invention.

Claims

1. An electric wheel drive axle assembly, characterized in that, It includes a bridge housing with an internal assembly cavity and a motor disposed within the assembly cavity. The inner wall of the end of the assembly cavity has an outer stop extending circumferentially therein, and the projection of the outer stop on a plane perpendicular to its axis is circular. The outer wall of the motor end has an inner stop extending circumferentially therein. The inner stop is fitted into the outer stop. The inner stop includes a planar support section and an arc-shaped support section. The planar support section and the arc-shaped support section are arranged alternately along the circumference of the motor and connected end to end. The projection of the planar support section on a plane perpendicular to the axis of the outer stop is a line segment, and the projection of the arc-shaped support section on a plane perpendicular to the axis of the outer stop is a circular arc. The bridge housing has a number of tightening bolts threaded through it radially from the outside to the inside. The inner end face of the tightening bolts is perpendicularly abutted against and pressed against the planar support section. The number of tightening bolts adapted to the same planar support section is even. The projection of the axis of the outer stop on the plane where the planar support section is located is used as the reference line. The tightening bolts adapted to the planar support section are symmetrically arranged on both sides of the reference line.

2. The electric wheel drive axle assembly as described in claim 1, characterized in that, There are four planar support segments and four arc-shaped support segments, and the projections of each planar support segment onto a plane perpendicular to the axis of the outer stop are of equal length.

3. The electric wheel drive axle assembly as described in claim 2, characterized in that, The projections of each of the arc-shaped support segments onto the plane perpendicular to the axis of the outer stop are of equal length and have equal central angles.

4. The electric wheel drive axle assembly as described in claim 1, characterized in that, The axes of the tightening bolts adapted to the same planar support section are located in the same plane perpendicular to the axis of the outer stop.

5. The electric wheel drive axle assembly as described in claim 4, characterized in that, The axes of the tightening bolts adapted to the same planar support section are parallel to each other.

6. The electric wheel drive axle assembly as described in claim 5, characterized in that, There are two tightening bolts that are adapted to the same planar support section.

7. The electric wheel drive axle assembly as described in claim 6, characterized in that, Two tightening bolts adapted to the same planar support section abut against the two edges of the planar support section symmetrically along the circumference of the motor.

8. The electric wheel drive axle assembly as described in claim 1, characterized in that, The outer wall of the bridge housing is recessed with bolt protection grooves. The tightening bolts are inserted one by one into the bolt protection grooves, and the outer end face of the tightening bolt does not protrude from the groove opening of the bolt protection groove.

9. The electric wheel drive axle assembly as described in claim 1, characterized in that, A locking nut is fitted onto the outer end of the tightening bolt. The locking nut is threadedly matched with the tightening bolt and abuts against and presses against the outer wall of the bridge housing.

10. A mining vehicle, comprising a vehicle body, electric wheels mounted on the vehicle body, and an electric wheel drive axle assembly connected to the electric wheels, characterized in that, The electric wheel drive axle assembly is an electric wheel drive axle assembly as described in any one of claims 1 to 9.

Images