Connecting structure between steering knuckle and supporting arm and assembling method

Abstract

The invention discloses a connecting structure between a steering knuckle and a supporting arm and an assembling method.The connecting structure between the steering knuckle and the supporting arm comprises a main pin, the steering knuckle and the supporting arm are rotationally connected through the main pin, the main pin is sleeved with an elastic sleeve, the main pin is matched with the conical surface of the elastic sleeve, and when the steering knuckle and the supporting arm rotate relatively, the main pin extrudes the elastic sleeve, and the elastic sleeve is sleeved with the main pin; the elastic sleeve elastically deforms, and the main pin and the supporting arm are in a relative static state through counter-acting force. When the structure is integrally assembled on the whole vehicle, under the influence of the load of the whole vehicle, the supporting arm and the steering knuckle extrude each other, the main pin has the upward displacement tendency relative to the supporting arm, the elastic sleeve can be extruded by the main pin, elastically deforms and presses the fist of the supporting arm, and under the influence of the counter-acting force, the elastic sleeve can reversely lock the main pin; the kingpin is arranged on the supporting arm, the kingpin is kept static relative to the supporting arm and does not rotate, the concentricity of the kingpin and the supporting arm is improved, a vehicle is more stable in the running process, and deflection is not prone to occurring.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile assembly, and particularly relates to a connection structure and an assembly method between a steering knuckle and a support arm. Background Art

[0002] Independent suspensions are applied to many automobiles. The wheels of the independent suspension are connected to the vehicle frame through a support arm and a swing arm mechanism, bearing the vertical and steering loads of the vehicle body and the bottom surface, so as to meet the driving requirements. In order to meet various driving conditions, the independent suspension needs to meet the requirements of stable driving, strong load-bearing capacity, and flexible and light steering.

[0003] The independent suspension is mainly composed of a steering knuckle and a support arm connected by a kingpin to achieve the steering action. A wedge-shaped groove is machined on the kingpin, and a wedge-shaped locking pin hole is machined at the relative position of the support arm. The three are connected and fixed by press fitting. A thrust bearing is installed on the lower end surface of the support arm, the lower end surface of the thrust bearing contacts the upper end surface of the lower hole of the steering knuckle, and an adjusting gasket is added between the upper end surface of the support arm and the lower end surface of the upper hole of the steering knuckle. However, the above connection structure has a small load-bearing capacity, and uneven force on the contact surface is prone to eccentric wear, resulting in a decrease in the concentricity of the components, making the vehicle prone to yaw during driving. Summary of the Invention

[0004] The present invention provides a connection structure and an assembly method between a steering knuckle and a support arm, which can solve the problems raised in the background art.

[0005] A connection structure between a steering knuckle and a support arm, applicable to the steering knuckle and the support arm, includes: a kingpin, the steering knuckle and the support arm are rotationally connected through the kingpin;

[0006] An elastic sleeve is sleeved on the kingpin, the kingpin and the elastic sleeve are in tapered surface fit, and the elastic sleeve is a hollow cylindrical sleeve with an inner diameter gradually increasing;

[0007] The elastic sleeve is provided with a plurality of notches that are the same in shape, opposite in opening direction, equidistant and staggered, for adjusting the tightness of the elastic sleeve;

[0008] When the steering knuckle and the support arm rotate relative to each other, the kingpin squeezes the elastic sleeve, and the elastic sleeve undergoes elastic deformation and makes the kingpin and the support arm in a relatively static state through the reaction force.

[0009] Preferably, the notch is provided with a long strip portion and a round end portion, and the long strip portion is open at one end far from the round end portion.

[0010] Preferably, the steering knuckle is provided with a first assembly hole and a second assembly hole, and a third assembly hole is provided at the fist of the support arm. The first assembly hole, the second assembly hole, the third assembly hole and the kingpin are coaxially arranged.

[0011] Preferably, the elastic sleeve is disposed in the third assembly hole and is in transitional fit with the third assembly hole.

[0012] Preferably, it further includes a connecting component for connecting the steering knuckle with the kingpin and the support arm with the kingpin.

[0013] Preferably, the connecting component includes a first bushing, a second bushing and a shaft sleeve. The first bushing is disposed between the kingpin and the first assembly hole. The second bushing and the shaft sleeve are sleeved on the kingpin in sequence from inside to outside and are disposed in the second assembly hole.

[0014] Preferably, a first gasket is disposed at the top of the support arm fist. The first gasket is sleeved on the kingpin, and first oil seals are disposed on both the upper and lower sides of the first gasket and are sleeved outside the kingpin.

[0015] Preferably, a second oil seal sleeved outside the kingpin is disposed at the bottom of the support arm fist.

[0016] Preferably, an end cap is disposed at the top of the steering knuckle, and a plug cap is disposed at the bottom. A second gasket is disposed between the plug cap and the shaft sleeve.

[0017] An assembly method between a steering knuckle and a support arm uses a connection structure between a steering knuckle and a support arm, including:

[0018] S1. Assemble the first oil seal on the support arm, and then place the elastic sleeve in the third assembly hole of the support arm;

[0019] S2. Press the first bushing into the first assembly hole of the steering knuckle, and respectively assemble the first oil seal and the second oil seal to the lower end face of the first assembly hole and the upper end face of the second assembly hole in the steering knuckle;

[0020] S3. Place the steering knuckle at the fist of the support arm, so that the first assembly hole, the second assembly hole and the third assembly hole are communicated to form a channel structure. Place the first gasket on the upper end face of the fist, and insert the kingpin into the channel structure;

[0021] S4. At the second assembly hole of the steering knuckle, press the shaft sleeve and the second bushing into the hole in sequence from outside to inside. At this time, the second bushing is sleeved on the kingpin;

[0022] S5. Assemble the initial second gasket at the bottom of the shaft sleeve, and then assemble the plug cap. Measure the steering knuckle clearance, calculate the required thickness of the second gasket, determine whether the thickness of the initial second gasket matches the steering knuckle clearance. If not, replace the second gasket with a thickness that matches, measure the starting torque, and adjust the specification of the second gasket based on the measurement result;

[0023] S6. Install the end cap and the oil nozzle, and the assembly is completed.

[0024] Advantages of the present invention:

[0025] (1) In the present invention, when the whole structure is assembled on the vehicle, affected by the vehicle load, there is mutual extrusion between the support arm and the steering knuckle. The kingpin has a tendency to move upward relative to the support arm. The elastic sleeve will be extruded by the kingpin, undergo elastic deformation and press the support arm fist. Affected by the reaction force, the elastic sleeve can lock the kingpin in the reverse direction, making it remain relatively stationary and non-rotating relative to the support arm, improving the concentricity between the kingpin and the support arm, avoiding eccentric wear, making the vehicle more stable during driving and not prone to yaw.

[0026] (2) In the present invention, a tapered surface fit is adopted between the kingpin and the elastic sleeve. Compared with the traditional straight hole fit, the fit is better, and actually increases the contact area between the kingpin and the elastic sleeve, making the force more dispersed and extending the service life of the whole structure. Description of the drawings

[0027] Figure 1 is a schematic structural diagram of a connection structure between a steering knuckle and a support arm according to the present invention;

[0028] Figure 2 is an exploded view of a connection structure between a steering knuckle and a support arm according to the present invention;

[0029] Figure 3 is a cross-sectional view of a connection structure between a steering knuckle and a support arm according to the present invention;

[0030] Figure 4 is Figure 2 a schematic structural diagram of the elastic sleeve in

[0031] Figure 5 is Figure 4 a cross-sectional view of the elastic sleeve in

[0032] Figure 6 is Figure 3 an enlarged view of part A in

[0033] Figure 7 is Figure 3 an enlarged view of part B in

[0034] Figure 8 is a schematic flow diagram of an assembly method for a steering knuckle and a support arm.

[0035] Description of the reference numerals:

[0036] 1. Steering knuckle; 11. First assembly hole; 12. Second assembly hole; 2. Support arm; 21. Third assembly hole; 3. King pin; 4. Elastic sleeve; 41. Notch; 411. Long strip; 412. Round end; 5. Connecting assembly; 51. First bushing; 52. Second bushing; 53. First oil seal; 54. Second oil seal; 55. First gasket; 56. Bushing; 57. Second gasket; 58. Plug cover; 59. End cover. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0038] like Figure 1 - Figure 2 As shown, a connection structure between a steering knuckle and a support arm is applicable to a steering knuckle 1 and a support arm 2 . The steering knuckle 1 is provided with a first assembly hole 11 and a second assembly hole 12 , and the fist of the support arm 2 is provided with a third assembly hole 13 .

[0039] like Figure 2 - Figure 3 As shown, the connection structure between the steering knuckle and the support arm includes: a kingpin 3, and the steering knuckle 1 and the support arm 2 are rotatably connected through the kingpin 3. Among them, the first assembly hole 11 of the steering knuckle 1, the second assembly hole 12 of the steering knuckle 1, and the third assembly hole 13 of the support arm 2 are coaxially arranged with the kingpin 3.

[0040] like Figure 3 - Figure 5 As shown, the kingpin 3 is provided with an elastic sleeve 4, and the elastic sleeve 4 is arranged in the third assembly hole 13 and transitionally matched with the third assembly hole 13. The kingpin 3 and the elastic sleeve 4 are matched with a conical surface, that is, the fitting surface of the kingpin 3 and the elastic sleeve 4 is a conical surface, and the taper range of the conical surface is between 0 and 7°, preferably, the taper is 5°. The elastic sleeve 4 is a hollow cylindrical sleeve with a gradually increasing inner diameter, and the elastic sleeve 4 is provided with a plurality of notches 41 of the same shape, opposite opening directions, equidistant and staggered, and the notches 41 are used to adjust the tightness of the elastic sleeve 4. Holes and slots staggered up and down: This design can make the elastic cone sleeve distribute stress more evenly when subjected to force. The staggered notches 41 can avoid stress concentration and reduce the risk of damage to the elastic sleeve 4 material due to excessive local stress. When the elastic sleeve 4 is subjected to external pressure or load, it can maintain better elasticity and deformation ability, thereby extending the service life.

[0041] Specifically, the notch 41 is provided with a long strip portion 411 and a round end portion 412. The long strip portion 411 is open at one end far from the round end portion 412. When the elastic sleeve 4 is applied between the support arm 2 and the kingpin 3, the elastic sleeve 4 needs to transmit torque or buffer movement. The design of the long strip portion 411 and the round end portion 412 helps to provide a better contact surface and buffer area, making the force transmission smoother and reducing vibration and shock transmission. This design can avoid damage to the kingpin caused by sudden loads and also helps to improve the working stability of the overall structure. The notch 41 is provided with the long strip portion 411 and the round end portion 412, which can make the elastic sleeve 4 easier to process during manufacturing. This shape is convenient for cutting and forming, reducing the process complexity, and at the same time can improve the product consistency and accuracy. In addition, the design of the elastic sleeve 4 needs to be able to quickly return to its original shape after being stressed. The long strip portion 411 can provide a good elastic effect, while the round end portion 412 helps to ensure the deformation and recovery ability of the notch 41 when stressed, avoiding stress concentration caused by sharp edges.

[0042] In addition, the notch 41 design helps to reduce the weight of the elastic sleeve 4 without significantly affecting the strength and function of the elastic sleeve 4. By arranging the notches 41 reasonably, the flexibility and toughness of the elastic sleeve 4 during operation can be maintained. Especially under high-frequency vibration or complex motion conditions, it can better adapt to the changes in dynamic loads. The design of opening holes and grooves can also effectively help the kingpin 3 dissipate heat. In some high-temperature environments (such as when the vehicle is driving in some tropical regions or in summer), the elastic sleeve 4 is easily affected by temperature changes. Through the notch 41 design, it is beneficial to quickly dissipate heat and avoid local overheating causing material deformation or performance degradation.

[0043] As Figure 2 - Figure 3 、 Figure 6 - Figure 7 shown, the connection structure between the steering knuckle and the support arm further includes a connection assembly 5. The connection assembly 5 is used to connect the steering knuckle 1 and the kingpin 3, and the support arm 2 and the kingpin 3.

[0044] Specifically, the connection assembly 5 includes a first bushing 51, a second bushing 52 and a sleeve 56. The first bushing 51 is arranged between the kingpin 3 and the first assembly hole 11. The second bushing 52 and the sleeve 56 are sleeved on the kingpin 3 in sequence from inside to outside and are arranged in the second assembly hole 12. Both the first bushing 51 and the second bushing 52 are in clearance fit with the kingpin 3, so that the kingpin 3 and the first bushing 51, and the kingpin 3 and the second bushing 52 can rotate relative to each other.

[0045] Further, a first gasket 55 is provided at the top of the fist of the support arm 2. The first gasket 55 is sleeved on the kingpin 3. First oil seals 53 sleeved outside the kingpin 3 are provided on both the upper and lower sides of the first gasket 55. A second oil seal 54 sleeved outside the kingpin 3 is provided at the bottom of the fist of the support arm 2. An end cap 59 is provided at the top of the steering knuckle 1, and a plug cap 58 is provided at the bottom. A second gasket 57 is provided between the plug cap 58 and the bush 56. A sealing ring is provided between the plug cap 58 and the inner wall of the second assembly hole 12, and a sealing ring is also provided between the end cap 59 and the inner wall of the first assembly hole 11.

[0046] The inventor found that if the kingpin and the elastic sleeve 4 adopt a straight-hole fit, in the case of an interference fit, although the fitting area between the two is large, the actual assembly is difficult. During use, it is easy to lock between the support arm 2 and the kingpin 3, and they need to be replaced together when replacing. If in the case of a clearance fit, there is basically no fit between the two. Although the assembly is relatively simple, during the operation of the vehicle, the kingpin 3 generates displacement in the third assembly hole 21 at the fist of the support arm 2. Once the assembly of the kingpin 3 is incorrect (the tightening torque is not well controlled, and both too large and too small torques will have an impact) or during long-term vibration, the locking force will decline, resulting in relatively fast wear of the kingpin 3.

[0047] In this embodiment, when the steering knuckle 1 and the support arm 2 rotate relative to each other, the kingpin 3 squeezes the elastic sleeve 4, and the elastic sleeve 4 undergoes elastic deformation and makes the kingpin 3 and the support arm 2 in a relatively static state through the reaction force. The kingpin 3 and the elastic sleeve 4 adopt a tapered surface fit. Compared with the traditional straight-hole fit, the fitting property is better, and actually the contact area between the kingpin 3 and the elastic sleeve 4 is increased, the force is more dispersed, and the service life of the whole structure is longer. Moreover, the third assembly hole 21 of the support arm 2 is a straight hole, which is convenient for processing, has a low cost, and the accuracy guarantee ability is also higher than that of the tapered hole processing method.

[0048] This type of structure is applied in the machine tool and equipment industries. During batch processing, the accuracy guarantee ability is high, and at the same time, it is small in size, light in weight, low in cost, and the qualified rate is also higher than that of processing tapered holes on the support arm 2.

[0049] The elastic sleeve 4 needs to be heat-treated. After the elastic sleeve 4 (the material is 65Mn or 60Si2MnA) is heat-treated, it can not only ensure a very high hardness (up to HRC55 - 60), but also maintain good elastic deformation ability. Common heat treatment methods include quenching, tempering and quenching and tempering treatment, which are used to adjust the microstructure of the material so as to optimize hardness and toughness. The specific heat treatment steps are well-known prior art to those skilled in the art, so they will not be elaborated here.

[0050] In this application, when the entire structure is assembled on the whole vehicle, affected by the load of the whole vehicle, there is mutual extrusion between the support arm 2 and the steering knuckle 1, and the kingpin 3 has a tendency to move upward relative to the support arm 2. At this time, the elastic sleeve 4 will be extruded by the kingpin 3, undergo elastic deformation and press the third assembly hole 21 at the fist of the support arm 2. Affected by the reaction force, the elastic sleeve 4 can lock the kingpin 3 in the reverse direction, keep it relatively stationary relative to the support arm 2 without rotation, improve the concentricity between the kingpin 3 and the support arm 2, avoid eccentric wear, make the vehicle more stable during driving and not prone to yaw. Only the clearance fit between the kingpin 3 and the bushing enables relative rotation between the two, thereby reducing the wear of the kingpin 3 and the three assembly holes.

[0051] Moreover, by locking the kingpin 3 through the elastic sleeve 4, the support arm 2 does not need to be machined with a lock pin hole, which not only ensures the strength of the support arm 2 but also improves its service life.

[0052] It can be understood that the taper inside the elastic sleeve 4 can be calculated (through the self-locking angle calculation formula in the mechanical design manual, through simulation analysis + bench test, and then verification and adjustment. This is an existing calculation method, so it will not be elaborated here), so that it is greater than the self-locking angle within the preset tolerance range. When loosening, the elastic sleeve 4 restores its elastic deformation and disengages from the kingpin 3, making the disassembly of the two simple and convenient.

[0053] The design of the entire structure cancels the thrust bearing, and the bearing capacity is not limited by the direct thrust bearing, which can avoid the influence of wear particles on the bearing rollers during long-term use, and the influence of bearing clearance does not need to be considered during the assembly and use process. It meets the requirements of large load, long life and convenient after-sales maintenance of the vehicle.

[0054] The components of the connection structure between the steering knuckle and the support arm adopt grease lubrication, so that each moving part can rely on the oil groove to store grease and form a lubricating oil film. The surface treatment process can also be adopted to ensure the movement fit and wear resistance between components.

[0055] As Figure 8 shown, in an embodiment, the present invention provides an assembly method between a steering knuckle and a support arm, using a connection structure between a steering knuckle and a support arm, including:

[0056] S1. Assemble the first oil seal 53 on the support arm 2, and then fix the support arm 2 on the tooling. Place the elastic sleeve 4 in the third assembly hole 21 of the support arm 2. In the vehicle loading posture, the end with the larger inner diameter of the elastic sleeve 4 faces downward, so that the elastic sleeve 4 has an interference fit with the third assembly hole 21.

[0057] S2. Press the first bushing 51 into the first assembly hole 11 of the steering knuckle 1, and assemble the first oil seal 53 and the second oil seal 54 to the lower end face of the first assembly hole 11 and the upper end face of the second assembly hole 12 in the steering knuckle 1 respectively.

[0058] S3. Place the steering knuckle 1 at the fist of the support arm 2, so that the first assembly hole 11, the second assembly hole 12 and the third assembly hole 21 are connected to form a channel structure. Place the first gasket 55 on the upper end face of the fist, and insert the kingpin 3 into the channel structure until the kingpin 3 is in tapered fit with the elastic sleeve 4.

[0059] Among them, there is a clearance fit between the kingpin 3 and the first bushing 51, and between the straight line segment below the tapered surface of the kingpin 3 and the third assembly hole 21 of the support arm 2. The clearance between the kingpin 3 and the first bushing 51 is 0.02 mm - 0.07 mm, and the clearance between the straight line segment below the tapered surface of the kingpin 3 and the third assembly hole 21 of the support arm 2 is H7 / h6. H7 and h6 are two common tolerance grades used to describe the dimensional fit between parts. The meaning of the H7 / h6 fit is that the outer diameter dimension of the straight line segment below the tapered surface of the kingpin 3 is smaller than the inner diameter dimension of the third assembly hole 21, so as to provide a certain fit clearance.

[0060] S4. At the second assembly hole 12 of the steering knuckle 1, press the shaft sleeve 56 and the second bushing 52 into the hole in sequence from outside to inside. At this time, the second bushing 52 is sleeved on the kingpin 3. There is a clearance fit between the shaft sleeve 56 and the second assembly hole 12 of the steering knuckle 1, and between the kingpin 3 and the second bushing 52. The clearance between the shaft sleeve 56 and the second assembly hole 12 of the steering knuckle 1 is H7 / h6, and the clearance between the kingpin 3 and the second bushing 52 is 0.02 mm - 0.07 mm.

[0061] S5. Assemble the initial second gasket 57 at the bottom of the shaft sleeve 56, and then assemble the plug 58. After tightening the bolt, the clearance of the steering knuckle 1 can be measured with a feeler gauge, and the thickness of the second gasket 57 required can be calculated. Judge whether the thickness of the initial second gasket 57 matches the clearance of the steering knuckle 1. If not, replace the second gasket 57 with a matching thickness, measure the starting torque, and adjust the specification of the second gasket 57 based on the measurement results.

[0062] The starting torque can be between 30 N and 50 N. If it exceeds 50 N, thin the thickness of the second gasket 57. If it is less than 30 N, thicken the thickness of the second gasket 57. Each 0.05 mm of the second gasket 57 is a specification difference, and the thickness specification of the second gasket 57 is selected based on the measured value of the starting torque.

[0063] It should be noted that the starting torque can be measured using a spring dynamometer. The ring of the spring dynamometer is connected to one end of the steering knuckle 1 through an auxiliary tool. In the present invention, the auxiliary tool is an extension rod, which is coaxial with the kingpin 3. The spring dynamometer is perpendicular to the extension rod. The operator can hold the spring dynamometer and pull it along the direction perpendicular to the extension rod.

[0064] S6. Install the end cap 59 and the oil nozzle, and the assembly is completed.

[0065] The above discloses only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A connection structure between a steering knuckle and a support arm, applicable to a steering knuckle (1) and a support arm (2), characterized in that: include: A kingpin (3), the steering knuckle (1) and the support arm (2) are rotatably connected via the kingpin (3); The main pin (3) is sleeved with an elastic sleeve (4), the main pin (3) and the elastic sleeve (4) are matched with each other in a conical surface, and the elastic sleeve (4) is a hollow cylindrical sleeve with a gradually increasing inner diameter; The elastic sleeve (4) is provided with a plurality of slots (41) of the same shape, opening in opposite directions, equidistant and staggered, for adjusting the tightness of the elastic sleeve (4); When the steering knuckle (1) and the support arm (2) rotate relative to each other, the kingpin (3) squeezes the elastic sleeve (4), and the elastic sleeve (4) undergoes elastic deformation and causes the kingpin (3) and the support arm (2) to be in a relatively static state through a reaction force.

2. A connection structure between a steering knuckle and a support arm as claimed in claim 1, characterized in that: The notch (41) is provided with a long strip portion (411) and a round end portion (412), and the long strip portion (411) is open at one end away from the round end portion (412).

3. The connection structure between a steering knuckle and a support arm according to claim 1, characterized in that: The steering knuckle (1) is provided with a first assembly hole (11) and a second assembly hole (12); the fist of the support arm (2) is provided with a third assembly hole (13); the first assembly hole (11), the second assembly hole (12), and the third assembly hole (13) are coaxially arranged with the kingpin (3).

4. A connection structure between a steering knuckle and a support arm as claimed in claim 3, characterized in that: The elastic sleeve (4) is arranged in the third assembly hole (13) and is transitionally matched with the third assembly hole (13).

5. The connection structure between the steering knuckle and the support arm according to claim 3, characterized in that: It also comprises a connecting assembly (5), wherein the connecting assembly (5) is used to connect the steering knuckle (1) and the kingpin (3), and the support arm (2) and the kingpin (3).

6. A connection structure between a steering knuckle and a support arm as claimed in claim 5, characterized in that: The connecting assembly (5) comprises a first bushing (51), a second bushing (52) and a shaft sleeve (56); the first bushing (51) is arranged between the main pin (3) and the first assembly hole (11); the second bushing (52) and the shaft sleeve (56) are sequentially sleeved on the main pin (3) from the inside to the outside and are arranged in the second assembly hole (12).

7. A connection structure between a steering knuckle and a support arm as claimed in claim 5, characterized in that: A first gasket (55) is provided at the top of the fist of the support arm (2), the first gasket (55) is sleeved on the kingpin (3), and first oil seals (53) sleeved outside the kingpin (3) are provided on both upper and lower sides of the first gasket (55).

8. The connection structure between a steering knuckle and a support arm as claimed in claim 5, characterized in that: A second oil seal (54) sleeved outside the king pin (3) is provided at the bottom of the fist of the support arm (2).

9. The connection structure between a steering knuckle and a support arm according to claim 6, characterized in that: The top of the steering knuckle (1) is provided with an end cover (59), the bottom is provided with a plug cover (58), and a second gasket (57) is provided between the plug cover (58) and the shaft sleeve (56).

10. A method for assembling a steering knuckle and a support arm, using a connection structure between a steering knuckle and a support arm as claimed in any one of claims 1 to 9, characterized in that: include: S1, assembling the first oil seal (53) on the support arm (2), and then placing the elastic sleeve (4) in the third assembly hole (21) of the support arm (2); S2, press-fitting a first bushing (51) into a first assembly hole (11) of the steering knuckle (1), and respectively assembling a first oil seal (53) and a second oil seal (54) to a lower end surface of the first assembly hole (11) and an upper end surface of the second assembly hole (12) in the steering knuckle (1); S3, placing the steering knuckle (1) at the fist of the support arm (2), so that the first assembly hole (11), the second assembly hole (12) and the third assembly hole (21) are connected to form a channel structure, placing a first gasket (55) on the upper end surface of the fist, and inserting the kingpin (3) into the channel structure; S4. Press the shaft sleeve (56) and the second bushing (52) into the second assembly hole (12) of the steering knuckle (1) from the outside to the inside, and the second bushing (52) is sleeved on the kingpin (3); S5. Assemble the initial second gasket (57) at the bottom of the shaft sleeve (56), then assemble the plug cover (58), measure the clearance of the steering knuckle (1), calculate the required thickness of the second gasket (57), determine whether the initial thickness of the second gasket (57) matches the clearance of the steering knuckle (1), if not, replace the second gasket (57) with a matching thickness, measure the starting torque, and adjust the specifications of the second gasket (57) based on the measurement result; S6. Install the end cover (59) and the oil nozzle. The assembly is complete.

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