Oil-lubricated front wheel bearing device for mining dump truck and its front axle assembly

Abstract

The present invention discloses an oil-lubricated front wheel bearing device for a mining dump truck, comprising: an end cover, a sealing ring, a viewing window and a magnetic plug; the inner side of the end cover is open, threaded holes are respectively provided on the end face and the side face, the viewing window is connected to the threaded hole on the end face, and the magnetic plug is connected to the threaded hole on the side face; a connecting ring edge is provided on the outer edge of the end cover, a connecting through hole is provided on the connecting ring edge, and the sealing ring is arranged on the inner side face of the connecting ring edge. The present invention also discloses a front axle assembly provided with the oil-lubricated front wheel bearing device for a mining dump truck. The present invention can improve the durability of the front wheel bearing and reduce the operation complexity during the process of replacing and maintaining the lubricating medium.

Description

Technical Field

[0001] The present invention belongs to mining dump trucks, and more specifically, relates to an oil-lubricated front-wheel bearing device for a mining dump truck and its front axle assembly. Background Art

[0002] A mining dump truck is a device used in open-pit mines for transporting earthwork and mineral materials. Mining dump trucks usually adopt a rear-wheel drive type. The front wheels, as important components of the chassis walking system, also have the function of steering. The front-wheel bearings of mining dump trucks always bear the supporting force from the ground. During operation, the front-wheel bearings will also bear the forward or backward thrust from the front axle, as well as the lateral force during steering. The front-wheel bearings bear various large and variable loads, and the operating conditions are very harsh. When the rated load of the bearings is certain, the lubricating medium and form of the bearings are the most important factors affecting their service life.

[0003] The front-wheel bearings of mining dump trucks usually use grease lubrication. However, the internal friction resistance of grease is large, resulting in a greater frictional torque when the dump truck starts. At the same time, the poor fluidity of grease causes poor heat dissipation and cooling performance. The operating temperatures of front-wheel bearings that usually use grease are generally relatively high. In addition, operations such as filling and replacing grease are difficult. It is necessary to remove the front wheels and bearings from the axle to achieve this, which takes more time for the front wheels of mining dump trucks during assembly and later maintenance, and at the same time results in a longer non-fault parking time for the dump truck, which has a great impact on the availability of the dump truck. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil-lubricated front-wheel bearing device for a mining dump truck and its front axle assembly, which can improve the durability of the front-wheel bearings and reduce the operational complexity during the process of replacing and maintaining the lubricating medium.

[0005] To achieve the above object, the technical solution used in the present invention is:

[0006] The oil-lubricated front-wheel bearing device for a mining dump truck includes: an end cover, a sealing ring, a window and a magnetic plug; the inner side of the end cover is open, and threaded holes are respectively provided on the end face and the side face. The window is connected to the threaded hole on the end face, and the magnetic plug is connected to the threaded hole on the side face; a connecting ring edge is provided on the outer edge of the end cover, a connecting through hole is provided on the connecting ring edge, and the sealing ring is arranged on the inner side face of the connecting ring edge.

[0007] Furthermore, the included angle between the threaded hole on the side face and the central axis of the end cover is 45°, and the included angle between the end face and the side face is 45°.

[0008] Further, it further includes a holding mechanism located inside the end cover. The holding mechanism includes: a support plate, a pressing plate, a sealing ring, a gasket, and a steel wire. The support plate is located inside the pressing plate. The support plate is provided with a first bolt through-hole. A through-hole is provided in the middle of the pressing plate, and a second bolt through-hole is provided on the outside. The head of the bolt is provided with a head through-hole, and its rod passes through the second bolt through-hole, the gasket, and the first bolt through-hole for fixing the pressing plate, the gasket, and the support plate. The steel wire is threaded through the head through-hole of the bolt for locking the bolt.

[0009] Further, it further includes a constant pressure device located inside the holding mechanism. The support plate is provided with a threaded hole outside the axis. The constant pressure device includes: a joint, a pipe, a union, a bracket, and a vent valve. The joint is installed on the threaded hole on the support plate. The bracket is provided with an adapter. The vent valve is arranged on the upper part of the adapter. A union is arranged below the adapter. The two ends of the pipe are respectively connected to the joint and the union.

[0010] The front axle assembly provided with the oil-lubricated front wheel bearing device for a mining dump truck includes an observation and filling device. The observation and filling device includes: an end cover, a sealing ring, a window, and a magnetic plug. The inside of the end cover is open, and threaded holes are respectively provided on the end face and the side face. The window is connected to the threaded hole on the end face, and the magnetic plug is connected to the threaded hole on the side face. A connecting ring edge is provided on the outer edge of the end cover. A connecting through-hole is provided on the connecting ring edge. The sealing ring is arranged on the inner side face of the connecting ring edge. The bolt passes through the connecting through-hole to connect the end cover to the front wheel, and a sealing ring is arranged between the end cover and the front wheel.

[0011] Preferably, a holding mechanism is arranged outside the outer bearing of the front wheel. The holding mechanism is located inside the end cover. The holding mechanism includes: a support plate, a pressing plate, a sealing ring, a gasket, and a steel wire. The support plate is located inside the pressing plate. The support plate is provided with a first bolt through-hole. A through-hole is provided in the middle of the pressing plate, and a second bolt through-hole is provided on the outside. The head of the bolt is provided with a head through-hole, and its rod passes through the second bolt through-hole, the gasket, and the first bolt through-hole and is connected to the shaft part of the front wheel. The steel wire is threaded through the head through-hole of the bolt. Preferably, it further includes a constant pressure device arranged between the support plate and the cover plate. The support plate is provided with a threaded hole outside the axis. The constant pressure device includes: a joint, a pipe, a union, a bracket, and a vent valve. The joint is installed on the threaded hole on the support plate. The bracket is provided with an adapter. The vent valve is arranged on the upper part of the adapter. A union is arranged below the adapter. The two ends of the pipe are respectively connected to the joint and the union.

[0012] The technical effects of the present invention include:

[0013] According to the above-described solution, the oil-lubricated front-wheel bearing device uses lubricating oil as the lubricating medium. Compared with grease, lubricating oil has good fluidity. During operation, the lubricating oil evenly distributes the heat generated by the bearing on the entire inner surface of the wheel hub cavity, dissipating heat more fully. When running continuously, the temperature rise of the bearing is smaller, and the bearing life is longer. During the filling, replacement, and regular sampling processes, there is no need to stop the vehicle for a long time to disassemble the wheel hub and other operations, greatly reducing the number of disassembled components. The non-fault parking time of the dump truck is shorter, and the impact on the dispatch rate of the dump truck is smaller.

[0014] In summary, the oil-lubricated front-wheel bearing device provided according to the above solution can improve the durability of the front-wheel bearing and reduce the complexity of operations during replacement and maintenance. Brief Description of the Drawings

[0015] Figure 1 is a side view of the dump truck in the present invention;

[0016] Figure 2 is an axonometric view of the front axle assembly in the present invention;

[0017] Figure 3 is a longitudinal sectional view of the front axle assembly in the present invention;

[0018] Figure 4 is in the present invention Figure 3 an enlarged view near the upper support plate;

[0019] Figure 5 is an enlarged perspective view near the breather valve in the present invention;

[0020] Figure 6 is a structural schematic diagram of the support plate in the present invention.

[0021] 1 - Dump truck, 2 - Front axle assembly, 3 - Rear axle assembly, 4 - Cover plate, 5 - Kingpin, 6 - Sealing ring, 7 - Spacer ring, 8 - Floating seal, 9 - Pin, 10 - Inner bearing, 11 - Outer bearing, 12 - Plug, 13 - Bolt (fastening member), 30 - Front axle, 31 - Through hole, 32 - Top surface, 33 - Bottom surface, 40 - Front axle shaft, 41 - Shaft portion, 42 - Base portion, 43 - Upper support ear, 43a - Upper shaft hole, 43b - End face; 44 - Lower support ear, 44a - Lower shaft hole, 44b - End face, 50 - Front wheel, 51 - Through hole, 120 - Retaining mechanism, 121 - Support plate, 121a - Threaded hole, 123 - Sealing ring, 124 - Gasket, 122 - Pressure plate, 122a - Through hole, 122b - Concave surface, 125 - Bolt (fastening member), 126 - Steel wire, 180 - Observation and filling device, 181 - End cover, 181a - End face, 181b - Side face, 182 - Bolt (fastening member), 183 - Sealing ring, 184 - Window, 185 - Magnetic plug, 240 - Constant pressure device; 241 - Connector, 242 - Pipe, 243 - Union, 244 - Bracket, 244a - Adapter, 245 - Vent valve, 246 - Bolt (fastening member), S1 - First space, S2 - Second space, S3 - Third space, W - Angle between end face and side face, O - Central axis, Z - Reference axis, T - Maximum distance from major diameter of threaded hole to center. Detailed implementation manners

[0022] The following description fully shows the specific implementation manners of the present invention, so that those skilled in the art can practice and reproduce it.

[0023] Refer to the attached Figures 1 to 5 , and the specific implementation manners of the oil-lubricated front wheel bearing device of the mining dump truck involved in the present invention will be described.

[0024] As Figure 1 shown, it is a side view of the dump truck in the present invention.

[0025] The front axle assembly 2 is located at the front wheel position of the dump truck 1. The front axle assembly 2 and the rear axle assembly 3 jointly support the dump truck 1. The front axle assembly 2 has both a walking function and a steering function.

[0026] As Figure 2 shown, it is an isometric view of the front axle assembly in the present invention; as Figure 3 shown, it is a longitudinal sectional view of the front axle assembly in the present invention. As Figure 4 shown, Figure 4 it is Figure 3 an enlarged view near the upper support plate in the present invention.

[0027] Hereinafter, the direction away from the front axle 30 along the central axis O is referred to as "outer side", and vice versa as "inner side". The direction away from the lower support ear 44 along the reference axis Z is referred to as "upper side", and vice versa as "lower side". The tangential direction of any point rotating around the central axis O is referred to as the circumferential direction.

[0028] The front axle assembly 2 includes: a front axle 30, a front axle shaft 40, and front wheels 50. The front axle 30 and the front wheels 50 are connected to both ends of the front axle shaft 40.

[0029] The front axle shaft 40 includes: a base portion 42 and a shaft portion 41; an upper support ear 43 and a lower support ear 44, which are integrally connected and extend along the reference axis Z, are provided inside the base portion 42.

[0030] The base portion 42 is arranged to be rotatable around the reference axis Z. The upper support ear 43 and the lower support ear 44 are inserted and installed on the front axle 30; the bottom surface 43b of the upper support ear 43 contacts the top surface 32 of the front axle 30, and the top surface 44b of the lower support ear 44 contacts the bottom surface 33 of the front axle 30. The front axle 30, the upper support ear 43, and the lower support ear 44 are respectively provided with through holes 31, an upper shaft hole 43a, and a lower shaft hole 44a centered on the reference axis Z; the kingpin 5 penetrates through the through hole 31, the upper shaft hole 43a, and the lower shaft hole 44a along the reference axis Z and is relatively fixed to the front axle 30 by means of shoulders; further restricting the degree of freedom of the kingpin 5 downward along the axis Z, the base portion 42 and the front axle 30 form an open third space S3. The cover plate 4 is fixed to the top of the upper support ear 43 by bolts (fastening members) 13, thereby restricting the degree of freedom of the kingpin 5 upward along the axis Z.

[0031] The shaft portion 41 is integrally provided on the base portion 42. The shaft portion 41 protrudes outward from the end surface of the base portion 42. The shaft portion 41 is formed into a hollow columnar shape in which the central axis O is aligned with the radial direction of an imaginary circle centered on the reference axis Z. The shaft portion 41 is provided with a second space S2 that penetrates along the central axis O, and the second space S2 communicates with the third space S3.

[0032] The front wheels 50 are connected to the shaft portion 41 by means of an inner bearing 10 and an outer bearing 11 so as to be rotatable around the central axis O. The inner bearing 10 and the outer bearing 11 maintain the working state of the front wheels 50 in the direction of the central axis O. The front wheels 50 are provided with through holes 51 that are parallel but not coincident with the central axis O. A plug 12 is provided outside the through holes 51. A floating seal mounting groove is provided on the inner end surface of the front wheels 50. In this embodiment, both the inner bearing 10 and the outer bearing 11 are single-row tapered roller bearings and are arranged back-to-back. That is, the inner rings of the two bearings are arranged close to each other.

[0033] The pin 9 is provided on the end face of the base 42 and extends outward from the end face of the base 42 along the central axis O. The spacer 7 is formed in an annular shape extending along the central axis O, which is disposed between the base 42 and the inner bearing 10, and has a groove arranged along the central axis O thereon; the extending section of the pin 9 is snapped into the groove to further fix the spacer 7 in the circumferential direction. A floating seal mounting groove is provided on the outer end face of the spacer 7, and a sealing ring 6 is provided between the spacer 7 and the base 42. The floating seal 8 is provided between the spacer 7 and the front wheel 50.

[0034] As Figure 5 shown, it is an enlarged view of an oblique view near the vent valve in the present invention. As Figure 6 shown, it is a schematic structural view of the support plate 121 in the present invention.

[0035] The holding mechanism 120 is disposed outside the outer bearing 11 and fixes the outer bearing 11 from the outside. The holding mechanism 120 maintains the state of the outer bearing 11 along the central axis O, that is, the holding mechanism 120 prevents the outer bearing 11 from falling off the shaft portion 41 of the front wheel 50. The holding mechanism 120 supports the outer bearing 11 from the outside, and thus, the holding mechanism 120 indirectly supports the front wheel 50 integrally fixed with the outer bearing 11, that is, the holding mechanism 120 supports the front wheel 50 via the outer bearing 11.

[0036] The holding mechanism 120 includes: a support plate 121, a pressure plate 122, a sealing ring 123, a gasket 124, a bolt (fastening member) 125, and a wire 126.

[0037] The support plate 121 is disposed on the outer end face of the shaft portion 41, and the support plate 121 is formed in a shape extending in a circular plate shape along the central axis O. The support plate 121 has a threaded hole 121a parallel to the central axis O and with its axis above the central axis O. The maximum distance from the major diameter of the threaded hole 121a to the central axis O is defined as T.

[0038] The pressure plate 122 is disposed outside the outer bearing 11, and the pressure plate 122 is formed in a shape extending in an annular shape along the central axis O. The radius of the through hole 122a in the middle of the pressure plate 122 is greater than the value of T. That is, the cylindrical surface of the through hole 122a does not block the threaded hole 121a. An annular concave surface 122b coaxial with the central axis O is provided inside the pressure plate 122.

[0039] The sealing ring 123 is provided between the support plate 121 and the end face of the shaft portion 41.

[0040] The gasket 124 is provided between the support plate 121 and the concave surface 122b. The gasket 124 is formed in a shape extending in an annular shape along the central axis O, and the radius of the inner hole of the gasket is greater than the value of T. By increasing or decreasing the number of gaskets 124, the pressing force of the pressure plate 122 on the outer bearing 11 can be adjusted in the direction of the central axis O.

[0041] The head of the bolt 125 is provided with a through hole, and its rod part passes through the through holes on the pressing plate 122, the gasket 124 and the support plate 121 and is connected to the shaft part 41. The bolt 125 fixes the pressing plate 122, the gasket 124 and the support plate 121 to the shaft part 41. The wire 126 passes through the through hole in the head of the bolt 125 and locks them in groups.

[0042] The observation and filling device 180 will be described. The observation and filling device 180 is integrally provided on the outside of the front wheel 50. The observation and filling device 180, the front axle 40, the spacer 7, the floating seal 8, the front wheel 50, and the support plate 121 form a closed first space S1 in the shape of a frustum of a cone with the central axis O as the axis.

[0043] The observation and filling device 180 includes: an end cover 181, a bolt (fastening member) 182, a sealing ring 183, a window 184, and a magnetic plug 185.

[0044] The end cover 181 is formed in a bottomed cylindrical shape that extends along the central axis and is blocked on the outside. The inside of the end cover 181 is open. The end face 181a and the side face 181b of the end cover form an angle W in a plane passing through the central axis O, and the angle W is 45°. A threaded hole coaxial with the central axis O is provided on the end face 181a. A threaded hole with an axis at a 45° angle to the central axis is also provided on the side face 181b.

[0045] The bolt 182 integrally fixes the end cover 181 to the front wheel 50. The sealing ring 183 is provided between the end cover 181 and the front wheel 50.

[0046] The window 184 is provided on the end face 181a of the end cover 181 and is connected to the threaded hole coaxial with the central axis O.

[0047] The magnetic plug 185 is provided on the side face 181b of the end cover 181 and is connected to the threaded hole.

[0048] Furthermore, the constant pressure device 240 will be described. The constant pressure device 240 is provided between the support plate 121 and the cover plate 4. Since the holding mechanism 120 to which the support plate 121 belongs is integrally held and fixed with the shaft part 41, and the cover plate 4 is integrally held and fixed with the upper ear 43. That is, the constant pressure device 240 is integrally fixed to the front axle 40. The constant pressure device 240 passes through the second space S2 and the third space S3 to communicate the closed first space S1 with the outside, so that the pressure in the closed first space S1 is kept consistent with the external pressure.

[0049] The constant pressure device 240 includes: a joint 241, a pipe 242, a straight joint 243, a bracket 244, a vent valve 245, and a bolt (fastening member) 246.

[0050] The joint 241 is disposed in the second space S2. One end of the joint 241 is installed in the threaded hole 121a on the support plate 121, and the other end faces inward.

[0051] The bracket 244 is integrally fixed above the cover plate 4 by means of bolts 246. The bracket 244 is provided with a tubular adapter 244a extending along the reference axis Z. A straight joint 243 is integrally provided below the adapter 244a.

[0052] The pipe 242 penetrates through the second space S2 and the third space S3. Both ends of the pipe 242 are connected to and fixed with the joint 241 and the straight joint 243 respectively.

[0053] The vent valve 245 is integrally provided above the adapter 244a.

[0054] Above, the specific implementation of the oil-lubricated front-wheel bearing device of the mining dump truck involved in the present invention has been elaborated. Next, the actual working process of this implementation will be described.

[0055] Place the dump truck 1 and the front axle assembly 2 horizontally, keep the magnetic plug 185 facing the 12 o'clock direction. After removing the magnetic plug 185, slowly fill the lubricating oil from the threaded hole, and at the same time observe through the viewing window 184 until the oil level of the lubricating oil reaches the middle of the viewing window 184, then stop filling and reinstall the magnetic plug 185.

[0056] Since the viewing window 184 is coaxial with the central axis O, and the first space S1 is also an annular closed space coaxial with the central axis O, the volume of the injected lubricating oil is 1 / 2 of the volume of the first space S1.

[0057] After filling, the first space S1 contains lubricating oil accounting for 1 / 2 of the total volume in the lower part and air accounting for 1 / 2 of the total volume in the upper part.

[0058] After refueling, the vehicle can run normally. During the vehicle operation, if it is necessary to check the quality of the lubricating oil in the first space S1, when parking, keep the magnetic plug 185 facing the 12 o'clock direction. After removing the magnetic plug 185, observe whether there are impurities such as iron filings adsorbed on the magnetic plug 185. Correspondingly, it is also possible to take a sample from this threaded hole for further oil quality analysis. After the inspection, reinstall the magnetic plug 185.

[0059] After the vehicle has run for a certain period of time and it is necessary to change the lubricating oil, place the dump truck 1 horizontally and keep the plug 12 facing the 6 o'clock direction. Remove the plug 12. Since the hole 51 is at the lowest position in the first space S1 at this time, the lubricating oil in the first space S1 flows out along the hole 51 under the action of gravity. After the lubricating oil has completely flowed out, reinstall the plug 12 and repeat the above filling steps to refill the lubricating oil.

[0060] During the above processes of refueling, inspection, and lubricating oil replacement, there is no need to disassemble and assemble any components other than the screw plug 12 and the magnetic screw plug 185. The process is simple, the refueling and replacement operation cycle is very short, and it will not affect the normal operation of the dump truck.

[0061] During the operation of the dump truck 1, the inner bearing 10 and the outer bearing 11 will generate a certain amount of heat. After the lubricating oil flows, the heat will be distributed throughout the first space S1, which will further cause the temperature inside the first space S1 to rise, that is, the internal temperature is higher than the ambient temperature. Further, the air pressure inside the closed first space S1 increases, and too high internal air pressure will cause leakage of the static seals 6, the sealing rings 123, the sealing rings 183, and the floating seal 8.

[0062] In the implementation scheme provided by the present invention, the constant pressure device 240 can effectively solve the above problems. When the pressure in the first space S1 rises, since the first space S1 is connected to the external atmosphere through the joint 241, the pipe 242, the straight joint 243, the adapter 244a, and the vent valve 245. In addition, the threaded hole 121a on the support plate 121 is set at a position higher than the central axis O, that is, higher than the oil level height inside the first space S1. The support plate 121 is fixed to the front axle 40, that is, the position of the support plate 121 relative to the central axis O is fixed. When the front wheel 50 rotates around the central axis O, the threaded hole 121a is always higher than the oil level. That is, the threaded hole 121a is not blocked by the lubricating oil, and the pipe 242 is always kept in communication with the air inside the first space S1.

[0063] Further, the vent valve 245 is arranged at a position near the cover plate 4, and is much higher than the oil level height of the first space S1 in height, and has a pipe 242 of a certain length. While ensuring the smooth discharge of high-pressure gas, it can further ensure that the lubricating oil will not overflow from the vent valve 245.

[0064] Correspondingly, when the external temperature is higher, that is, the ambient temperature is higher than the temperature inside the first space S1, the constant pressure device 240 can maintain the reverse flow of air, that is, air enters the first space S1 from the outside, so as to maintain the internal and external pressure balance.

[0065] Both ends of the pipe 242 are integrally fixed to the support plate 121 and the bracket 244, and the support plate 121 and the bracket 244 are integrally fixed to the front axle 40. Correspondingly, the pipe 242 passes through the second space S2 and the third space S3, and the pipe 242 is integrally fixed to the front axle 40. When the front axle 40 swings at a certain angle around the reference axis Z, the pipe 242 will not undergo deformations such as stretching and compression, further avoiding leakage caused by the deformation of the pipe 242.

[0066] The oil-lubricated front wheel bearing device according to the above solution uses lubricating oil as the lubricating medium. Compared with grease, lubricating oil has good fluidity. During operation, the lubricating oil evenly distributes the heat generated by the bearing on the entire inner cavity surface of the wheel hub, dissipating heat more fully. When running continuously, the temperature rise of the bearing is smaller and the bearing life is longer. During the processes of filling, sampling inspection and replacement, there is no need to stop the vehicle for a long time to disassemble the front wheel hub and other operations, greatly reducing the number of disassembled parts. The fault-free parking time of the dump truck is shorter, and the impact on the dispatch rate of the dump truck is smaller.

[0067] The terms used in the present invention are illustrative and exemplary, rather than restrictive. Since the present invention can be specifically implemented in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An oil-lubricated front wheel bearing device for a mining dump truck, characterized in that, Comprising: An end cover, a sealing ring, a window, a magnetic plug, a holding mechanism and a constant pressure device; the inner side of the end cover is open, threaded holes are respectively provided on the end face and the side face, and the end cover is formed into a bottomed cylindrical shape extending along the central axis and blocked on the outside; the window is connected to the threaded hole on the end face, and the magnetic plug is connected to the threaded hole on the side face; a connecting ring edge is provided on the outer edge of the end cover, a connecting through hole is provided on the connecting ring edge, and the sealing ring is provided on the inner side face of the connecting ring edge; the holding mechanism is located inside the end cover, and the holding mechanism includes: a support plate, a pressing plate, a sealing ring, a gasket, a steel wire; the support plate is located inside the pressing plate, the support plate is provided with a first bolt through hole, a through hole is provided in the middle of the pressing plate, and a second bolt through hole is provided on the outside; the head of the bolt is provided with a head through hole, and its rod part passes through the second bolt through hole, the gasket and the first bolt through hole for fixing the pressing plate, the gasket and the support plate; the steel wire is threaded through the head through hole of the bolt for locking the bolts in groups; the constant pressure device is located inside the holding mechanism, and the support plate is provided with a threaded hole outside the axis; the constant pressure device includes: a joint, a tube, a union, a bracket, a vent valve; the joint is installed on the threaded hole on the support plate, the bracket is provided with an adapter, the vent valve is integrally provided on the upper part of the adapter, a union is integrally provided below the adapter, and the two ends of the tube are respectively connected to the joint and the union.

2. The oil-lubricated front wheel bearing device for a mining dump truck according to claim 1, characterized in that, The included angle between the threaded hole on the side face and the central axis of the end cover is 45°, and the included angle between the end face and the side face is 45°.

3. A front axle assembly provided with an oil-lubricated front wheel bearing device for a mining dump truck, characterized in that, Comprising: Front axle, front shaft, front wheels, observation and filling device. The front axle and the front wheel connectors are at both ends of the front shaft. The front shaft includes: a base portion and a shaft portion. The shaft portion is integrally provided on the base portion. The base portion and the front axle form an open third space. The shaft portion is provided with a second space that penetrates along the central axis. The second space and the third space are connected; The observation and filling device is integrally provided on the outer side of the front wheel. The observation and filling device, the front shaft, the spacer, the floating seal, the front wheel, and the support plate form a conical closed first space; The observation and filling device includes: an end cover, a sealing ring, a window, and a magnetic plug; The inner side of the end cover is open, and threaded holes are respectively provided on the end face and the side face. The window is connected to the threaded hole on the end face, and the magnetic plug is connected to the threaded hole on the side face; A connecting ring edge is provided on the outer edge of the end cover. The connecting ring edge is provided with a connecting through hole. The sealing ring is provided on the inner side face of the connecting ring edge; A bolt passes through the connecting through hole to connect the end cover to the front wheel. The sealing ring is located between the end cover and the front wheel; A retaining mechanism is provided on the outer side of the outer bearing of the front wheel. The retaining mechanism is located inside the end cover. The retaining mechanism includes: a support plate, a pressing plate, a sealing ring, a gasket, and a wire; The support plate is located inside the pressing plate. The support plate is provided with a first bolt through hole; A through hole is provided in the middle of the pressing plate, and a second bolt through hole is provided on the outside; The head of the bolt is provided with a head through hole, and its rod portion passes through the second bolt through hole, the gasket, and the first bolt through hole and is connected to the shaft portion of the front wheel; The wire is threaded through the head through hole of the bolt for locking the bolt; A constant pressure device is further included. The constant pressure device is provided between the support plate and the cover plate. The support plate is provided with a threaded hole outside the axis; The constant pressure device includes: a joint, a tube, a union, a bracket, and a vent valve; The joint is installed on the threaded hole on the support plate. The bracket is provided with an adapter. The vent valve is provided on the upper part of the adapter. A union is provided below the adapter. The two ends of the tube are respectively connected to the joint and the union.

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