Kingpin Spherical Plain Bearing for Mine Dump Truck and Its Installation Method

Abstract

The present invention discloses a kingpin spherical plain bearing for a mining dump truck, comprising: a spherical kingpin, an upper bushing, a lower bushing, a bearing housing, a retaining pin, and a support plate; the spherical kingpin is provided with a spherical head at the upper part, and the inner cavity of the upper bushing is provided with a hemispherical inner wall; the lower bushing includes two lower bushing segments, the inner wall of the lower bushing is provided with an arc-shaped ring surface, and the upper part of the outer wall is provided with a housing pin hole; the upper bushing and the lower bushing are installed in a seat hole, and the retaining pin is installed in a first positioning groove and a second positioning groove; the spherical head is installed in the space surrounded by the hemispherical inner wall and the arc-shaped ring surface, and the support plate is connected to the lower end surface of the bearing housing through a support plate connecting bolt. The present invention also discloses an installation method for the kingpin spherical plain bearing of a mining dump truck. The present invention can adjust the angles of the upper bushing, the lower bushing, and the bearing housing at the connection point at any angle, ensuring the connection strength and stability and reliability of the connection position.

Description

Technical Field

[0001] The invention belongs to the field of mining dump trucks, and particularly relates to a kingpin joint bearing for a mining dump truck and an installation method thereof. Background Art

[0002] A mining dump truck is a device used for transporting earthwork and mineral materials in open-pit mines. It has a huge self-weight and load, and operates in a harsh environment. The double-wishbone independent suspension has great advantages because of its good connection stiffness and reliability, which separates the mutual influence of the wheel hub jumps on both sides and improves the comfort of the mining dump truck. It is an independent suspension suitable for the operating conditions of mining dump trucks.

[0003] The function of the steering knuckle is to transmit and bear the load at the front of the vehicle, support and drive the front wheels to rotate around the kingpin to make the vehicle turn; the front end of the steering knuckle is rotatably connected to the front end of the upper wishbone through the kingpin. The front part of the upper wishbone rotates circumferentially around the kingpin shaft. The rear end of the upper wishbone is installed on the vehicle frame through the upper wishbone pin shaft, and the rear end of the upper wishbone rotates longitudinally around the upper wishbone pin shaft; the front suspension cylinder is connected to the upper part of the steering knuckle through the front suspension cylinder pin shaft. The connection position between the steering knuckle and the upper wishbone bears the acting force of the front suspension cylinder and the lateral force of the tire at the same time. This puts strict requirements on the connection type and structure of the upper wishbone, the front suspension cylinder and the steering knuckle. The reliability of the connection here has an important impact on the reliability of the front suspension and even the whole vehicle.

[0004] During the operation of the dump truck, due to the bounce and steering of the front wheels, the circumferential and longitudinal angles between the steering knuckle and the upper wishbone will change, and the angle between the front suspension cylinder and the steering knuckle will also change; the steering knuckle needs to bear and conduct the forces in all directions. Restricted by the positions of the kingpin shaft, the upper wishbone pin shaft, and the front suspension cylinder pin shaft, torsion will be generated at the connection positions of the upper wishbone, the front suspension cylinder and the steering knuckle, affecting the reliability and safety of the connection positions. Summary of the Invention

[0005] The purpose of the invention is to provide a kingpin joint bearing for a mining dump truck and an installation method thereof, which can adjust the angles of the upper bushing, the lower bushing, and the bearing housing at the connection position at any angle, avoid the formation of mutual torsion among the front suspension cylinder, the upper wishbone, and the steering knuckle at the common connection position, and ensure the connection strength and stability and reliability of the connection position.

[0006] To achieve the above purpose, the technical solution used in the invention is:

[0007] The kingpin joint bearing of a mining dump truck includes: a spherical kingpin, an upper bushing, a lower bushing, a bearing housing, a retaining pin, and a support plate; the spherical kingpin is provided with a spherical head at the upper part, the inner cavity of the upper bushing is provided with a hemispherical inner wall, the hemispherical inner wall is provided with an upper bushing through hole at the top center, the hemispherical inner wall is provided with an upper bushing annular oil groove, a longitudinal oil groove, and an upper bushing semi-annular oil groove, the upper bushing semi-annular oil groove is located at the bottom of the hemispherical inner wall, the annular oil groove intersects and communicates with the longitudinal oil groove, and the longitudinal oil groove communicates with the upper bushing through hole; the lower bushing includes two lower bushing parts, the inner wall of the lower bushing is provided with an arc-shaped ring surface, the arc-shaped ring surface is provided with a lower bushing annular oil groove and a lower bushing semi-annular oil groove, the lower bushing semi-annular oil groove is located at the top of the arc-shaped ring surface, the outer wall surface of the lower bushing part is provided with a first positioning groove, and the first positioning groove communicates with the lower end surface of the lower bushing part; the upper part of the outer wall of the bearing housing is provided with a housing pin hole, the inside is provided with a seat hole and a seat hole oil passage, the opening of the seat hole is located at the bottom of the bearing housing, one opening of the seat hole oil passage is located on the outer wall of the bearing housing, and the other opening is located at the top center of the seat hole, the seat hole is provided with a second positioning groove, and the second positioning groove communicates with the lower end surface of the bearing housing; the upper bushing and the lower bushing are installed in the seat hole, the upper bushing is located above the lower bushing, the seat hole oil passage is opposite to the position of the upper bushing through hole, and the retaining pin is installed in the first positioning groove and the second positioning groove; the spherical head is installed in the space surrounded by the hemispherical inner wall and the arc-shaped ring surface, the support plate includes two support plate parts, the two support plate parts are located on both sides of the lower part of the spherical head, and the support plate parts are connected to the lower end surface of the bearing housing through support plate connecting bolts.

[0008] Further, the arc-shaped ring surface and the hemispherical inner wall have the same diameter.

[0009] Further, the spherical kingpin includes: a spherical head, a flange base, a curved surface connecting column, and a base connecting bolt. The upper part of the spherical kingpin is spherical, the bottom is connected to the top of the curved surface connecting column, the bottom of the curved surface connecting column is connected to the top center of the flange base, the flange base is provided with a plurality of flange base through holes, and the base connecting bolts are installed at the flange base through holes.

[0010] Further, the upper bushing semi-annular oil groove is parallel to the upper bushing annular oil groove, the lower bushing annular oil groove and the lower bushing semi-annular oil groove are parallel to each other, and the upper bushing semi-annular oil groove is located above the lower bushing semi-annular oil groove.

[0011] Further, the support plate is in the shape of a circular ring, including two semi-circular ring-shaped support plate parts with the same shape. The support plate parts are provided with a plurality of support plate through holes, and the bottom end surface of the bearing housing is provided with a plurality of housing threaded holes. The support plate connecting bolts pass through the support plate through holes and are connected to the housing threaded holes.

[0012] Furthermore, an adjustment gasket is arranged between the support plate and the lower end surface of the bearing housing, and the support plate connecting bolt passes through the gasket through hole, and the support plate through hole is connected to the housing threaded hole to connect the support plate and the adjustment gasket to the bottom of the bearing housing.

[0013] Furthermore, the outer circumferential surface of the upper bushing is a stepped cylindrical shape, and the diameter of the first outer circumferential surface at the lower part of the outer circumferential surface is greater than the diameter of the second outer circumferential surface at the upper part of the outer circumferential surface; the outer circumferential surface of the lower bushing is a cylindrical shape, and the diameters of the first outer circumferential surface of the lower bushing are the same; the seat hole is a stepped cylindrical shape with a top, comprising: a first inner circumferential surface and a second inner circumferential surface, the first inner circumferential surface is located at the lower part of the second inner circumferential surface, and the diameter of the first inner circumferential surface is greater than the diameter of the second inner circumferential surface; the second outer circumferential surface is opposite to the second inner circumferential surface, and the first outer circumferential surface and the outer wall surface of the lower bushing are opposite to the first inner circumferential surface; the outer wall surface of the lower bushing is a clearance fit with the first inner circumferential surface of the seat hole, and the first outer circumferential surface of the upper bushing is an interference fit with the first inner circumferential surface of the seat hole.

[0014] Furthermore, the center of the hemispherical inner wall, the center of the bushing through hole, and the center of the annular oil groove are located on the same axis; the plane where the upper bushing bottom surface at the bottom of the upper bushing and the lower bushing top surface of the lower bushing split are located passes through the center of the hemispherical inner wall and is perpendicular to the central axis.

[0015] Furthermore, the hemispherical inner wall is provided with a plurality of upper bushing annular oil grooves and two longitudinal oil grooves, the plurality of upper bushing annular oil grooves are parallel to each other, the two longitudinal oil grooves are perpendicular to each other, and the upper bushing through hole is located at the intersection of the two longitudinal oil grooves.

[0016] The installation method of the kingpin joint bearing of a mining dump truck includes:

[0017] The upper bushing is installed into the seat hole of the bearing housing, the spherical head of the spherical kingpin is installed into the hemispherical inner wall of the upper bushing, the two lower bushings of the lower bushing are installed in the seat holes on both sides of the spherical head, and the bayonet is installed in the first positioning groove and the second positioning groove; the two gaskets and the two support plates are installed to the bottom of the bearing housing from both sides of the spherical head respectively, the support plate connecting bolts pass through the support plate through holes and the gasket through holes and are connected to the threaded holes of the housing, and the support plate and the adjusting gasket are connected and fixed to the bottom of the bearing housing;

[0018] Move the bearing housing to the upper part of the steering knuckle, and connect the base connecting bolts to the top of the steering knuckle through the through hole of the flange base; pass the pin shaft of the front suspension cylinder through the pin hole of the housing and the pin hole of the suspension cylinder at the bottom of the front suspension cylinder to hinge the upper part of the bearing housing with the lower part of the front suspension cylinder, and pass the pin shaft of the cross arm through the through hole of the cross arm to hinge the side of the upper cross arm to the frame;

[0019] Lubricating grease is injected into the hemispherical inner wall of the upper bushing from the seat hole oil passage and the through hole of the upper bushing. The lubricating grease enters the annular oil groove of the upper bushing through the longitudinal oil groove, and under the action of pressure, the lubricating grease fills the gap between the spherical head and the hemispherical inner wall; under the action of pressure, the lubricating grease overflows downward and enters the semi-annular oil groove of the upper bushing and the semi-annular oil groove of the lower bushing, and then continues to enter the annular oil groove of the lower bushing, filling the gap between the arc-shaped ring surface and the spherical head.

[0020] The technical effects of the present invention include:

[0021] In the present invention, the spherical kingpin of the kingpin joint bearing can adjust the angles at the connection points of the upper bushing, the lower bushing, and the bearing housing at any angle under the constraints of the upper bushing, the lower bushing, and the bearing housing, and will not generate torsion caused by rigid connection at the top of the steering knuckle, avoiding the mutual torsion at the common connection position of the front suspension cylinder, the upper cross arm, and the steering knuckle under different working conditions, and ensuring the connection strength and stable reliability of the connection position.

[0022] By arranging an oil passage for the flow of lubricating oil in the upper bushing and the lower bushing, the kingpin joint bearing makes the space between the spherical kingpin and the upper bushing and the lower bushing full of grease, which can ensure sufficient lubrication between the spherical kingpin and the upper bushing and the lower bushing, minimize wear, and effectively extend the service life and reliability of the kingpin joint bearing.

[0023] The kingpin joint bearing has a simple structure, is convenient for maintenance, and can bear a large load capacity to adapt to the operating conditions of mining vehicles. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the connection position of the kingpin joint bearing of the mining dump truck in the present invention;

[0025] Figure 2 is in the present invention Figure 1 an enlarged cross-sectional view of the local part K;

[0026] Figure 3 is a schematic diagram of the structure of the spherical kingpin in the present invention;

[0027] Figure 4 is a schematic diagram of the structure of the upper bushing in the present invention;

[0028] Figure 5 is a longitudinal sectional view of the upper bushing in the present invention.

[0029] Figure 6 is a schematic diagram of the structure of the lower bushing in the present invention;

[0030] Figure 7 is a longitudinal sectional view of the lower bushing in the present invention;

[0031] Figure 8 is a schematic diagram of the structure of the carrier plate in the present invention;

[0032] Figure 9 It is a schematic structural diagram of the adjusting gasket in the present invention. Detailed implementation manners

[0033] The following description fully shows the specific implementation manners of the present invention, enabling those skilled in the art to practice and reproduce.

[0034] As Figure 1 shown, it is a schematic diagram of the connection position of the kingpin joint bearing of the mining dump truck in the present invention.

[0035] The kingpin joint bearing 3 is arranged at the connection points of the steering knuckle 1, the upper cross arm 2, and the front suspension cylinder 4. The upper cross arm 2 bears the acting force from the front suspension cylinder 4 and transmits the acting force to the steering knuckle 1 through the kingpin joint bearing 3. Moreover, the upper cross arm 2 plays a constraining role on the steering knuckle 1 by means of the kingpin joint bearing 3.

[0036] In the following description, the direction along the central axis X is called the axial direction, the tangential direction of any point rotating around the central axis X is called the circumferential direction or the peripheral direction, and the direction intersecting with the central axis X and perpendicular to the central axis X is called the radial direction.

[0037] As Figure 2 shown, it is Figure 1 a magnified cross-sectional view of the K part in the present invention.

[0038] The kingpin joint bearing 3 includes: a spherical kingpin 31, an upper bushing 32, a lower bushing 33, a bearing housing 34, a retaining pin 35, a support plate 36, and an adjusting gasket 37.

[0039] As Figure 3 shown, it is a schematic structural diagram of the spherical kingpin 31 in the present invention.

[0040] The spherical kingpin 31 includes: a spherical head 311, a flange base 312, a curved surface connecting column 313, and a base connecting bolt 314; the upper part of the spherical kingpin 31 is spherical, the bottom is connected to the top of the curved surface connecting column 313, the bottom of the curved surface connecting column 313 is connected to the top center of the flange base 312, the flange base 312 is provided with a plurality of flange base through holes 315, the base connecting bolt 314 is installed at the flange base through holes 315, and the base connecting bolt 314 is connected to the steering knuckle 1. The spherical kingpin 31 is integrally and fixedly connected to the steering knuckle 1 by means of the base connecting bolt 314.

[0041] As Figure 4 shown, it is a schematic structural diagram of the upper bushing 32 in the present invention; as Figure 5 shown, it is a longitudinal sectional schematic diagram of the upper bushing 32 in the present invention.

[0042] The upper bushing 32 is arranged inside the bearing housing 34. Its outer peripheral surface is a stepped cylindrical shape. The first outer peripheral surface 322 is located below the second outer peripheral surface 323, and the diameter of the first outer peripheral surface 322 is larger than that of the second outer peripheral surface 323. The stepped cylindrical outer peripheral surface is beneficial to enhancing the supporting force of the upper bushing 32.

[0043] The upper bushing 32 is provided with a hemispherical inner wall 321 in the inner cavity. The hemispherical inner wall 321 positions the upper half of the spherical head 311. The upper bushing 32 is provided with an upper bushing through-hole 324 at the center of the top. The upper bushing through-hole 324 communicates with the hemispherical inner wall 321. The hemispherical inner wall 321 is provided with a plurality of upper bushing annular oil grooves 325 and longitudinal oil grooves 326, and a semi-circular upper bushing oil groove 327. The semi-circular upper bushing oil groove 327 is parallel to the upper bushing annular oil grooves 325, and the semi-circular upper bushing oil groove 327 is located at the bottom of the hemispherical inner wall 321. The annular oil grooves 325 intersect and communicate with the longitudinal oil grooves 326, and the longitudinal oil grooves 326 communicate with the upper bushing through-hole 324.

[0044] In this preferred embodiment, the hemispherical inner wall 321 is provided with three upper bushing annular oil grooves 325 and two longitudinal oil grooves 326, which are respectively the first annular oil groove, the second annular oil groove, and the third annular oil groove. The planes where the first annular oil groove, the second annular oil groove, the third annular oil groove, and the semi-circular upper bushing oil groove 327 are located are parallel to each other. The two longitudinal oil grooves 326 are respectively the first longitudinal oil groove and the second longitudinal oil groove, and the planes where the first longitudinal oil groove and the second longitudinal oil groove are located are perpendicular to each other.

[0045] The center O of the sphere of the hemispherical inner wall 321, the center of the bushing through-hole 324, and the center of the circle of the annular oil groove 325 are located on the same axis X. The upper bushing bottom surface 328 at the bottom of the upper bushing 32 passes through the center O of the sphere of the hemispherical inner wall 321 and is perpendicular to the central axis X. The distance from the bottom end of the longitudinal oil groove 326 to the upper bushing bottom surface 328 is T2.

[0046] The included angle between the plane of the first annular oil groove passing through the center O of the sphere and the plane of the second annular oil groove passing through the center O of the sphere is S1. The included angle between the plane of the second annular oil groove passing through the center O of the sphere and the plane of the third annular oil groove passing through the center O of the sphere is S2. The horizontal included angle of the plane of the third annular oil groove passing through the center O of the sphere is S3. S1, S2, and S3 are equal.

[0047] As Figure 6 shown, it is a schematic structural diagram of the lower bushing 33 in the present invention; as Figure 7 shown, it is a longitudinal sectional view of the lower bushing 33 in the present invention.

[0048] The lower bushing 33 is arranged in the bearing housing 34 and is located below the upper bushing 32.

[0049] The lower bushing 33 includes two lower bushing parts 331 of the same structure. The two lower bushing parts 331 are combined to form a lower bushing 33 of annular shape. The outer wall of the lower bushing 33 is cylindrical, and the inner wall is provided with an arcuate annular surface 332. The arcuate annular surface 332 is a part of the lower part of the spherical surface. The arcuate annular surface 332 is provided with a lower bushing annular oil groove 333 and a lower bushing semi-annular oil groove 334. The lower bushing semi-annular oil groove 334 is located at the top of the arcuate annular surface 332. The outer wall of the lower bushing part 331 is provided with a first positioning groove 336, and the first positioning groove 336 is connected to the lower end surface of the lower bushing part 331. The arcuate annular surface 332 and the hemispherical inner wall 321 have the same diameter.

[0050] The lower bushing top surface 335 of the lower bushing split body 331 passes through the spherical center O and is perpendicular to the central axis X. The lower bushing 33 is assembled in two lower bushing split bodies 331 , so as to be easily installed under the spherical head 311 of the spherical kingpin 31 .

[0051] After the upper bushing 32 and the lower bushing 33 are installed in the bearing housing 34, the upper bushing bottom surface 328 of the upper bushing 32 is pressed on the lower bushing top surface 335 of the lower bushing 33, and the upper bushing semi-annular oil groove 327 and the lower bushing semi-annular oil groove 334 are closed to form a closed oil groove.

[0052] A housing pin hole is provided on the upper portion of the outer wall of the bearing housing 34, and the housing pin hole is used for hinge connection with the front suspension cylinder 4. The side portion of the outer wall is used for rigid connection with the upper cross arm 2, and a plurality of housing threaded holes are provided on the bottom end face. A seat hole 341 and a seat hole oil passage 342 are provided inside the bearing housing 34, and the opening of the seat hole 341 is located at the bottom of the bearing housing 34, and one opening of the seat hole oil passage 342 is located on the outer wall, and the other opening is located at the top center of the seat hole 341.

[0053] The seat hole 341 is a stepped cylindrical shape with a top, including: a first inner circumferential surface and a second inner circumferential surface, the first inner circumferential surface is located at the lower part of the second inner circumferential surface, and the diameter of the first inner circumferential surface is greater than the diameter of the second inner circumferential surface; the inner wall of the seat hole 341 is provided with a second positioning groove 343, and the second positioning groove 343 is connected to the lower end surface of the bearing housing 34.

[0054] After the upper bushing 32 and the lower bushing 33 are installed in the seat hole 341, the second outer peripheral surface 323 is opposite to the second inner peripheral surface, and the first outer peripheral surface 322 and the outer wall surface of the lower bushing 33 are opposite to the first inner peripheral surface; the outer wall surface of the lower bushing 33 and the first inner peripheral surface of the seat hole 341 are clearance fit, and the first outer peripheral surface 322 of the upper bushing 32 and the first inner peripheral surface of the seat hole 341 are interference fit; the seat hole oil passage 342 is aligned with the upper bushing through hole 324.

[0055] The snap pin 35 is installed in the first positioning groove 336 and the second positioning groove 343 to position the lower bushing 33 and restrict the circumferential rotation of the lower bushing 33 relative to the seat hole 341.

[0056] As Figure 8 shown, it is a schematic structural view of the carrier plate 6 in the present invention.

[0057] The carrier plate 36 is in an annular shape and includes two semi-annular carrier plate segments 361 with the same shape. The carrier plate segments 361 are provided with a plurality of carrier plate through holes 362, and carrier plate connecting bolts 363 are installed at the carrier plate through holes 362.

[0058] The carrier plate 36 adopts an assembly method of two carrier plate segments 361, which is convenient for installation under the spherical head 311 of the spherical kingpin 31.

[0059] As Figure 9 shown, it is a schematic structural view of the adjusting gasket 37 in the present invention.

[0060] The adjusting gasket 37 is in an annular shape and is located below the carrier plate 36. Its structure includes two semi-annular gasket segments 371 with the same shape. The gasket segments 371 are provided with a plurality of gasket through holes 372.

[0061] The carrier plate connecting bolt 363 passes through the gasket through hole 372 and the carrier plate through hole 362 and is connected to the housing threaded hole, connecting the carrier plate 36 and the adjusting gasket 37 to the bottom of the bearing housing 34, and fixing the upper bushing 32 and the lower bushing 33 in the seat hole 341, and limiting the spherical head 311 of the spherical kingpin 31 in the space enclosed by the hemispherical inner wall 321 and the arc-shaped ring surface 332.

[0062] By adjusting the thickness of the installed adjusting gasket 37, the clamping force of the carrier plate 36 on the upper bushing 32 and the lower bushing 33 can be adjusted, and the clamping degree of the hemispherical inner wall 321 and the arc-shaped ring surface 332 on the spherical head 311 can be adjusted, that is, the clearance of the kingpin spherical bearing 3 is adjusted.

[0063] The grease pump injects lubricating grease from the seat hole oil passage 342, and then the grease enters the upper bushing through hole 324 at the top of the upper bushing 32, and enters the upper bushing annular oil groove 325 after passing through the longitudinal oil groove 326.

[0064] The clearance of the kingpin spherical plain bearing 3 is relatively small. Under the action of the oblique downward load of the front suspension cylinder 4, the upper part of the spherical head 311 contacts the hemispherical inner wall 321. The longitudinal oil groove 326 and the upper bushing annular oil groove 325 can enable the lubricating grease to smoothly enter the gap between the spherical head 311 and the hemispherical inner wall 321. Since the longitudinal oil groove 326 terminates at a position with a distance T2 from the bottom surface 328 of the upper bushing, the lubricating grease will not flow out along the longitudinal oil groove 326. Under the pressure of the grease pump, the lubricating grease fully fills the gap between the upper part of the spherical head 311 and the hemispherical inner wall 321.

[0065] When the lubricating grease is continuously injected under the pressure of the grease pump and then overflows downward from the gap between the spherical head 311 and the hemispherical inner wall 321, the overflowed grease will enter the upper bushing semi-circular oil groove 327 and the lower bushing semi-circular oil groove 334 to form a closed oil groove. Then the grease overflows downward and enters the lower bushing annular oil groove 333 until it finally overflows.

[0066] The oil grooves on the upper bushing 32 and the lower bushing 33 can fully hold the lubricating grease in the gap between the hemispherical inner wall 321, the arc-shaped ring surface 332, and the diameter of the spherical head 311. During the process of the kingpin spherical plain bearing 3 being impacted by the front suspension cylinder 4, the steering knuckle 1 bouncing and rotating, a complete oil film is always maintained in the gap, fundamentally reducing the occurrence of wear and effectively extending the service life and reliability of the kingpin spherical plain bearing 3.

[0067] No matter how the front suspension cylinder 4, the upper cross arm 2, and the steering knuckle 1 rotate and twist from any angle, the kingpin spherical plain bearing 3 will coordinate the connection angles of the three at the connection position and will not generate torsion caused by rigid connection at the top of the steering knuckle 1. That is, through the kingpin spherical plain bearing 3, the mutual torsion among the front suspension cylinder 4, the upper cross arm 2, and the steering knuckle 1 at the connection position is eliminated, ensuring the connection strength and stable reliability at the connection position.

[0068] The installation method of the kingpin spherical plain bearing for mining dump trucks is as follows:

[0069] 1. Install the upper bushing 32 into the seat hole 341 of the bearing housing 34, install the spherical head 311 of the spherical kingpin 31 into the hemispherical inner wall 321 of the upper bushing 32, insert the two lower bushing parts 331 of the lower bushing 33 from both sides of the spherical head 311 into the seat hole 341, and install the snap pin 35 into the first positioning groove 343 and the second positioning groove 336. Install the two gasket parts 371 and the two support plate parts 361 from both sides of the spherical head 311 to the bottom of the bearing housing 34 respectively. The support plate connection bolt 363 passes through the support plate through hole 362 and the gasket through hole 372 and is connected to the housing threaded hole to connect and fix the support plate 36, the adjusting gasket 37 and the bottom of the bearing housing 34.

[0070] 2. Move the bearing housing 34 to the upper part of the steering knuckle 1. The base connection bolt 314 passes through the flange base through-hole 315 and is connected to the top of the steering knuckle 1. The front suspension cylinder pin shaft passes through the housing pin hole and the suspension cylinder pin hole at the bottom of the front suspension cylinder 4 to hinge the upper part of the bearing housing to the front suspension cylinder 4. The cross-arm pin shaft passes through the cross-arm through-hole to hinge the side part of the upper cross-arm 2 to the vehicle frame;

[0071] 3. Inject lubricating grease from the seat hole oil passage 342 and the upper bushing through-hole 324 into the hemispherical inner wall 321 of the upper bushing 32. The lubricating grease enters the upper bushing annular oil groove 325 intersecting with it through the longitudinal oil groove 326. Under the action of pressure, the lubricating grease fills the gap between the spherical head 311 and the hemispherical inner wall 321. The lubricating grease overflows downward under the action of pressure and enters the upper bushing semi-annular oil groove 327 and the lower bushing semi-annular oil groove 334, and then continues to enter the lower bushing annular oil groove 333 to fill the gap between the arc-shaped ring surface 332 and the spherical head 311.

[0072] The terms used in the present invention are illustrative and exemplary terms, not restrictive. Since the present invention can be embodied in many 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 broadly construed 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. A kingpin spherical plain bearing for mining dump trucks, characterized in that, Including: Spherical kingpin, upper bushing, lower bushing, bearing housing, retaining pin, support plate; The spherical kingpin includes: spherical head, flange base, curved surface connecting column, base connecting bolt. The upper part of the spherical kingpin is spherical, and the bottom is connected to the top of the curved surface connecting column. The bottom of the curved surface connecting column is connected to the center of the top of the flange base. The flange base is provided with a plurality of flange base through holes, and the base connecting bolt is installed at the flange base through holes; The outer peripheral surface of the upper bushing is a stepped cylindrical shape, and the diameter of the first outer peripheral surface at the lower part of the outer peripheral surface is larger than the diameter of the second outer peripheral surface at the upper part of the outer peripheral surface; The outer peripheral surface of the lower bushing is cylindrical, and the diameter of the first outer peripheral surface of the outer peripheral surface of the lower bushing is the same; The spherical kingpin is provided with a spherical head at the upper part. The inner cavity of the upper bushing is provided with a hemispherical inner wall. The hemispherical inner wall is provided with an upper bushing through hole at the center of the top. The hemispherical inner wall is provided with an upper bushing annular oil groove, longitudinal oil groove, upper bushing semi-annular oil groove. The upper bushing semi-annular oil groove is located at the bottom of the hemispherical inner wall. The annular oil groove intersects and communicates with the longitudinal oil groove, and the longitudinal oil groove communicates with the upper bushing through hole; The lower bushing includes two lower bushing segments. The inner wall of the lower bushing is provided with an arc-shaped ring surface. The arc-shaped ring surface is provided with a lower bushing annular oil groove, lower bushing semi-annular oil groove. The lower bushing semi-annular oil groove is located at the top of the arc-shaped ring surface. The outer wall surface of the lower bushing segment is provided with a first positioning groove, and the first positioning groove communicates with the lower end surface of the lower bushing segment; The upper part of the outer wall of the bearing housing is provided with a housing pin hole, and the inside is provided with a seat hole, seat hole oil passage. The seat hole is a stepped cylindrical shape with a top. The seat hole includes: a first inner peripheral surface, a second inner peripheral surface. The first inner peripheral surface is located at the lower part of the second inner peripheral surface, and the diameter of the first inner peripheral surface is larger than the diameter of the second inner peripheral surface; The second outer peripheral surface is opposite to the second inner peripheral surface in position, and the first outer peripheral surface, the outer wall surface of the lower bushing and the first inner peripheral surface of the seat hole are opposite in position; The outer wall surface of the lower bushing and the first inner peripheral surface of the seat hole are in clearance fit, and the first outer peripheral surface of the upper bushing and the first inner peripheral surface of the seat hole are in interference fit; The opening of the seat hole is located at the bottom of the bearing housing, and one opening of the seat hole oil passage is located on the outer wall of the bearing housing, and the other opening is located at the center of the top of the seat hole. The seat hole is provided with a second positioning groove, and the second positioning groove communicates with the lower end surface of the bearing housing; The upper bushing and the lower bushing are installed in the seat hole. The upper bushing is located above the lower bushing. The seat hole oil passage is opposite to the position of the upper bushing through hole. The retaining pin is installed in the first positioning groove and the second positioning groove; The spherical head is installed in the space surrounded by the hemispherical inner wall and the arc-shaped ring surface. The support plate includes two support plate segments. The two support plate segments are located on both sides of the lower part of the spherical head. The support plate segments are connected to the lower end surface of the bearing housing through support plate connecting bolts.

2. The kingpin spherical plain bearing for mining dump trucks according to claim 1, characterized in that, The diameters of the arc-shaped ring surface and the hemispherical inner wall are the same.

3. The kingpin spherical plain bearing for mining dump trucks according to claim 1, characterized in that, The upper bushing semi-annular oil groove and the upper bushing annular oil groove are parallel to each other. The lower bushing annular oil groove and the lower bushing semi-annular oil groove are parallel to each other. The upper bushing semi-annular oil groove is located at the top of the lower bushing semi-annular oil groove.

4. The kingpin spherical plain bearing for mining dump trucks according to claim 1, characterized in that, The support plate is in the shape of a circular ring, including two semicircular support plate parts of the same shape. The support plate parts are provided with multiple support plate through holes, and the bottom end face of the bearing housing is provided with multiple housing threaded holes. The support plate connecting bolts pass through the support plate through holes and are connected to the housing threaded holes.

5. The kingpin spherical plain bearing for mining dump trucks according to claim 4, characterized in that, An adjusting gasket is arranged between the support plate and the lower end surface of the bearing housing. The support plate connecting bolt passes through the gasket through hole, and the support plate through hole is connected to the housing threaded hole to connect the support plate and the adjusting gasket to the bottom of the bearing housing.

6. The kingpin spherical plain bearing for mining dump trucks according to claim 1, characterized in that, The center of the hemispherical inner wall, the center of the bushing through hole, and the center of the annular oil groove are located on the same axis; the plane where the upper bushing bottom surface of the upper bushing bottom and the lower bushing top surface of the lower bushing split body are located passes through the center of the hemispherical inner wall and is perpendicular to the central axis.

7. The kingpin spherical plain bearing for mining dump trucks according to claim 1, characterized in that, The hemispherical inner wall is provided with a plurality of upper bushing annular oil grooves and two longitudinal oil grooves, the plurality of upper bushing annular oil grooves are parallel to each other, the two longitudinal oil grooves are perpendicular to each other, and the upper bushing through hole is located at the intersection of the two longitudinal oil grooves.

8. An installation method for the kingpin spherical plain bearing for mining dump trucks according to any one of claims 1 - 7, characterized in that, include: The upper bushing is installed into the seat hole of the bearing housing, the spherical head of the spherical kingpin is installed into the hemispherical inner wall of the upper bushing, the two lower bushings of the lower bushing are installed in the seat holes on both sides of the spherical head, and the bayonet is installed in the first positioning groove and the second positioning groove; the two gaskets and the two support plates are installed to the bottom of the bearing housing from both sides of the spherical head respectively, the support plate connecting bolts pass through the support plate through holes and the gasket through holes and are connected to the threaded holes of the housing, and the support plate and the adjusting gasket are connected and fixed to the bottom of the bearing housing; Move the bearing housing to the upper part of the steering knuckle, and connect the base connecting bolts to the top of the steering knuckle through the through hole of the flange base; pass the pin shaft of the front suspension cylinder through the pin hole of the housing and the pin hole of the suspension cylinder at the bottom of the front suspension cylinder to hinge the upper part of the bearing housing with the lower part of the front suspension cylinder, and pass the pin shaft of the cross arm through the through hole of the cross arm to hinge the side of the upper cross arm to the frame; The lubricating grease is injected into the hemispherical inner wall of the upper bushing from the oil channel of the seat hole and the through hole of the upper bushing. The lubricating grease enters the annular oil groove of the upper bushing through the longitudinal oil groove. Under the action of pressure, the lubricating grease fills the gap between the spherical head and the hemispherical inner wall; under the action of pressure, the lubricating grease overflows downward into the semi-annular oil groove of the upper bushing and the semi-annular oil groove of the lower bushing, and continues to enter the annular oil groove of the lower bushing, filling the gap between the arc-shaped ring surface and the spherical head.

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