Work machine, front axle assembly and manufacturing method thereof

Abstract

The invention relates to the technical field of operation machinery, and provides operation machinery, a front axle assembly and a manufacturing method thereof, and the front axle assembly comprises a shaft body part and a bent neck. The shaft body part comprises a shaft body and a lining body, the shaft body is a round pipe, and the shaft body is oppositely provided with a first end and a second end in the axial direction of the shaft body; the lining body is arranged on at least one of the first end and the second end, and the lining body is in interference fit with the shaft body and is fixedly welded to the shaft body. The bent necks are arranged at the two ends of the shaft body component, are in interference fit with the lining body and the shaft body respectively and are welded and fixed to the shaft body. The shaft body and the lining body are combined to form the shaft body part of the front axle assembly, so that the lining body is in interference fit with the shaft body and is welded and fixed with the shaft body. And the bent neck is respectively in interference fit with the lining body and the shaft body and is welded and fixed with the shaft body. According to the front axle assembly, the purpose of weight reduction can be achieved, stress concentration can be relieved, the structural strength of the axle body component is improved, and the problem that a large front axle assembly cannot be cast is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of operating machinery, and in particular to an operating machinery, a front axle assembly and a manufacturing method thereof. Background Art

[0002] The front axle is a device that transmits the forces acting in all directions between the frame and the front wheels, as well as the bending moment and torque generated by them. That is, the front axle (also called the front axle) is connected to the frame (or load-bearing body) through the suspension, and wheels are installed at both ends. The vertical load on the frame is transmitted to the wheels through the front axle; the rolling resistance, driving force, braking force and lateral force on the wheels, as well as the bending moment and torque, are transmitted to the suspension and frame through the axle, and the steering of the operating machinery is achieved by the swing of the steering knuckle.

[0003] The front axle is the safety guarantee for the normal operation of operating machinery, etc. The industry regards it as a security part and has very high strength requirements for it. In related technologies, most front axles are made by integral forging, and the forged front axle is limited by the structure, length and uneven distribution of metal volume along the axis. It is difficult to achieve the front axle with a kingpin center distance exceeding 1900mm by forging. In addition, when the front axle is processed by integral forging, a metal forging die is required, and the processing and maintenance costs of the die are high, and the manufacturing cycle of the die is long. In other related technologies, the front axles used in operating machinery mostly use plate-welded front axles. In order to ensure strength, the belly plate of the plate-welded front axle needs to be widened and thickened, etc., resulting in hypertrophy of the fist part, and conventional steering knuckles and wheel side structures cannot be assembled, and the manufacturing cost increases. Summary of the invention

[0004] The first aspect of the present invention provides a front axle assembly to solve at least one of the above-mentioned technical defects in the prior art, which can not only achieve the purpose of weight reduction, but also alleviate stress concentration and improve the structural strength of the shaft body components, so as to effectively solve the problem that large front axle assemblies cannot be cast; and the manufacturing cost is low and the versatility is strong.

[0005] A second aspect of the present invention provides a method for manufacturing a front axle assembly.

[0006] A third aspect of the present invention provides a working machine.

[0007] A first aspect of the present invention provides a front axle assembly, comprising an axle body component and a bending neck.

[0008] The shaft component includes a shaft body and a lining body. The shaft body is a round tube. The shaft body is provided with a first end and a second end relatively along its own axial direction. The lining body is provided on at least one of the first end and the second end. The lining body is interference fit with the shaft body and is welded and fixed to the shaft body.

[0009] The bent necks are arranged at both ends of the shaft body component, and the bent necks are respectively interference-fitted with the liner and the shaft body, and are fixed to the shaft body by welding.

[0010] According to the front axle assembly provided by the present invention, the outer circumferential surface of the liner is formed with a welding surface welded to the shaft body; the outer circumferential surface of the liner is formed with an assembly surface interference fit with the bent neck, and the assembly surface and the welding surface are staggered.

[0011] According to the front axle assembly provided by the present invention, the shaft body is a seamless steel tube; and the liner is any one of a tube body and a shaft body.

[0012] According to the front axle assembly provided by the present invention, the outer diameter of the shaft body is 154 mm-164 mm, and the inner diameter of the shaft body is 114 mm-124 mm.

[0013] The front axle assembly provided according to the present invention further includes a leaf spring support, which includes an upper support and a lower support. The upper support and the lower support are relatively clamped on the outer side of the shaft body, and the upper support and the lower support are welded.

[0014] A second aspect of the present invention provides a method for manufacturing a front axle assembly, comprising the following steps: A seamless steel pipe of a preset length is cut as a shaft body, and a stepped hole is processed at at least one end of the shaft body; Preheating both ends of the shaft body, and pressing a liner into the stepped hole of the shaft body to form a shaft body component; The two ends of the shaft component are preheated, and the shaft component is pressed into the bending neck; after the bending neck and the shaft component are corrected, the connection between the bending neck and the shaft component is welded.

[0015] According to the manufacturing method of the front axle assembly provided by the present invention, after preheating the two ends of the shaft body and pressing the liner into the stepped hole of the shaft body, the method further comprises: After the liner and the shaft body are cooled, welding is performed on the connection between the liner and the shaft body; After welding is completed, the liner and the shaft body are processed to form an assembly surface on the surface of the liner.

[0016] According to the manufacturing method of the front axle assembly provided by the present invention, after welding the connection between the bending neck and the shaft body component, the welding position between the bending neck and the shaft body component is annealed.

[0017] The method for manufacturing a front axle assembly according to the present invention further includes: Position and fix the upper support on the shaft body, perform fillet welding on the front and rear welding grooves of the upper support, and reserve 5-10mm at the ends; position and fix the lower support on the shaft body, perform fillet welding on the front and rear welding grooves of the upper support, and reserve 5-10mm at the ends.

[0018] A third aspect of the present invention provides a working machine, comprising a steering knuckle, a wheel hub and any one of the front axle assemblies, wherein the steering knuckle is arranged on the front axle assembly, and the wheel hub is arranged on the steering knuckle.

[0019] The front axle assembly provided by the present invention adopts a shaft body and a liner to form the shaft body component of the front axle. The shaft body is provided with a first end and a second end along its own axial direction; the liner is provided on at least one of the first end and the second end, and the liner is interference fit with the shaft body and is welded and fixed to the shaft body. The bent neck is respectively interference fit with the liner and the shaft body, and is welded and fixed to the shaft body. Such a setting can not only achieve the purpose of weight reduction, but also relieve stress concentration and improve the structural strength of the shaft body component, so as to effectively solve the problem that large front axle assemblies cannot be cast.

[0020] Since the front axle assembly provided by the embodiment of the present invention is formed by assembling structural parts, it does not need to be cast by metal forging dies, does not involve mold processing and maintenance, and has low manufacturing costs. In addition, since the shaft body component is improved in the front axle assembly provided by the embodiment of the present invention, the structure of the bending neck is still formed by the existing forging process or casting process, which can adapt to the installation of steering knuckles on the market and has strong versatility.

[0021] The manufacturing method of the front axle assembly provided by the present invention is simple to process. The operating machine provided by the present invention has all the above advantages because it includes the above front axle assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a front view of the front axle assembly provided by an embodiment of the present invention.

[0024] Figure 2 It is a top view of the front axle assembly provided by an embodiment of the present invention.

[0025] Figure 3 It is a schematic structural diagram of the axle component in the front axle assembly provided by an embodiment of the present invention.

[0026] Figure 4It is a partial cross-sectional view of the center shaft body of the front axle assembly provided by an embodiment of the present invention.

[0027] Figure 5 yes Figure 4 Enlarged view of part A in the middle.

[0028] Figure 6 It is one of the partial structural schematic diagrams of the axle component in the front axle assembly provided in an embodiment of the present invention.

[0029] Figure 7 This is the second partial structural schematic diagram of the axle component in the front axle assembly provided in an embodiment of the present invention.

[0030] Reference numerals: 100, shaft body component; 110, shaft body; 111, stepped hole; 120, liner; 121, assembly surface; 122, welding surface; 200, bend neck; 300, leaf spring support; 310, upper support; 320, lower support. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0033] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Figure 1 It is a front view of the front axle assembly provided by an embodiment of the present invention. Figure 2 It is a top view of the front axle assembly provided by an embodiment of the present invention. Figure 3 It is a schematic structural diagram of the axle component in the front axle assembly provided by an embodiment of the present invention.

[0036] See also Figures 1 to 3 An embodiment of the present invention provides a front axle assembly, which includes an axle body component 100 and a bending neck 200.

[0037] The shaft component 100 includes a shaft body 110 and a lining 120. The shaft body 110 is a round tube, and the shaft body 110 is provided with a first end and a second end relatively along its own axial direction; the lining 120 is provided on at least one of the first end and the second end, and the lining 120 is interference fit with the shaft body 110 and is welded and fixed to the shaft body 110.

[0038] The round tube is a seamless steel tube. The seamless steel tube is made by perforating a whole round steel bar. There is no weld on the surface of the steel tube. The seamless steel tube can be divided into hot-rolled seamless steel tube, cold-rolled seamless steel tube, cold-drawn seamless steel tube, extruded seamless steel tube, jacking tube, etc. According to the cross-sectional shape, seamless steel tubes are divided into round and special-shaped ones. Special-shaped tubes have various complex shapes such as square, oval, triangle, hexagon, etc. The maximum diameter of seamless steel tubes is 900mm and the minimum diameter is 4mm.

[0039] The neck 200 is provided at both ends of the shaft body component 100, and the neck 200 is respectively interference fit with the liner 120 and the shaft body 110, and is welded and fixed with the shaft body 110. The neck 200 can be processed by the existing forging process or casting process, and can adapt to the installation of the steering knuckle on the market, and has strong versatility.

[0040] In other words, in order to reduce the weight of the front axle assembly and improve the structural strength of the front axle assembly, the embodiment of the present invention makes the front axle assembly adaptable to large-scale working machinery. The shaft body component 100 of the front axle assembly adopts a structure formed by combining the shaft body 110 and the liner 120. The liner 120 can play a positioning role on the one hand, and can alleviate the stress concentration problem on the other hand, thereby improving the structural strength of the shaft body component 100, and can be made into a front axle with a kingpin center distance exceeding 1900mm, solving the problem that large front axle assemblies cannot be cast.

[0041] Furthermore, since the front axle assembly provided by the embodiment of the present invention is formed by assembling structural parts, it does not need to be cast by a metal forging die, does not involve die processing and maintenance, and has a low manufacturing cost. Furthermore, since the shaft body component 100 is improved in the front axle assembly provided by the embodiment of the present invention, the structure of the bending neck 200 is still formed by the existing forging process or casting process, which can adapt to the installation of steering knuckles on the market and has strong versatility.

[0042] It can be understood that the front axle assembly provided in the embodiment of the present invention adopts a shaft body 110 and a liner 120 to form the shaft body component 100 of the front axle, and the shaft body 110 is provided with a first end and a second end along its own axial direction; the liner 120 is provided on at least one of the first end and the second end, and the liner 120 is interference fit with the shaft body 110, and is welded and fixed to the shaft body 110. The bent neck 200 is respectively interference fit with the liner 120 and the shaft body 110, and is welded and fixed to the shaft body 110. Such an arrangement can not only achieve the purpose of weight reduction, but also relieve stress concentration, improve the structural strength of the shaft body component 100, and effectively solve the problem that large front axle assemblies cannot be cast; and the manufacturing cost is low and the versatility is strong.

[0043] Figure 4 It is a partial cross-sectional view of the center shaft body of the front axle assembly provided by an embodiment of the present invention. Figure 5 yes Figure 4 Enlarged view of part A in the middle. Figure 6 It is one of the partial structural schematic diagrams of the axle component in the front axle assembly provided in an embodiment of the present invention. Figure 7 This is the second partial structural schematic diagram of the axle component in the front axle assembly provided in an embodiment of the present invention.

[0044] Continue reading Figure 3 , and also see Figure 6 and Figure 7 In some embodiments of the present invention, a welding surface 122 is formed on the outer circumferential surface of the liner 120 for welding to the shaft body 110; an assembly surface 121 is formed on the outer circumferential surface of the liner 120 for interference fit with the bent neck 200, and the assembly surface 121 and the welding surface 122 are staggered.

[0045] Since the main deformation of the liner 120 when subjected to force is shearing, adjacent cross sections are prone to displacement. By staggering the assembly surface 121 of the neck 200 and the liner 120, and the welding surface 122 of the shaft body 110 and the liner 120, stress concentration on the liner 120 can be avoided, ensuring that the shaft body component has a strong structural stability.

[0046] The liner 120 is any one of a tube body or a shaft body. That is, the liner 120 can be a tube body or a shaft body. When the liner 120 is a shaft body, the liner 120 can be integrally formed with the neck 200, and then the liner 120 and the shaft body 110 are interference fit, and then the neck 200 and the shaft body 110 are welded and fixed.

[0047] Since the liner 120 is a shaft body, whether it is interference fit with the shaft body 110 or cast integrally with the neck 200, the weight of the shaft body component 100 will increase. Therefore, the embodiment of the present invention preferably uses the liner 120 as a tube body, which can not only achieve the purpose of weight reduction but also improve the structural strength.

[0048] In some embodiments of the present invention, the outer diameter of the shaft body 110 is 154 mm-164 mm, that is, the outer diameter of the shaft body 110 can be 154 mm, 156 mm, 159 mm or 163 mm, etc. The inner diameter of the shaft body 110 is 114 mm-124 mm, that is, the inner diameter of the shaft body 110 can be 114 mm, 116 mm, 119 mm, 123 mm, etc.

[0049] The inner diameter of the liner 120 may be 95 mm-105 mm, that is, the inner diameter of the liner 120 may be 95 mm, 98 mm, 100 mm or 105 mm, etc.

[0050] Since the outer diameter, inner diameter and length of the shaft body 110 can be selected as needed, the liner 120 is set according to the size of the shaft body 110, so that the shaft body component 100 can be made into a front axle with a kingpin center distance exceeding 1900mm, solving the problem that large front axle components cannot be cast. This is equivalent to the shaft body component 100 composed of a seamless steel pipe and a liner 120 in the embodiment of the present invention, replacing the forged front axle in the related art. It can not only simplify the processing process and reduce processing costs, but also achieve the purpose of weight reduction, relieve stress concentration, and improve the structural strength of the shaft body component 100, so as to effectively solve the problem that large front axle components cannot be cast.

[0051] Continue reading Figure 1 and Figure 2In some embodiments of the present invention, the front axle assembly further includes a leaf spring support 300, the leaf spring support 300 includes an upper support 310 and a lower support 320, the upper support 310 and the lower support 320 are relatively clamped on the outer side of the shaft body 110, and the upper support 310 and the lower support 320 are welded.

[0052] The upper support 310 can be used as a mounting base for the leaf spring, and the lower support 320 can be composed of a base plate, a vertical plate, and a rib plate, etc., and ribs are arranged between the base plate and the vertical plate; the vertical plate is clamped on the shaft body 110.

[0053] Another aspect of the present invention provides a method for manufacturing a front axle assembly, the method comprising the following steps: Step S100: Cut a seamless steel tube of a preset length as the shaft body 110, and process a stepped hole 111 at at least one end of the shaft body 110, such as Figure 5 shown.

[0054] Since the seamless steel pipe is a steel pipe made by punching a whole round steel bar without a weld on the surface, the seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, jacking pipe, etc. That is, the seamless steel pipe is a prefabricated pipe, so it can be cut into a suitable size according to the use requirements and used as the shaft body 110. For example, a seamless steel pipe with an outer diameter of 159 mm, an inner diameter of 119 mm, and a length greater than or equal to 1900 mm is selected as the shaft body 110.

[0055] Stepped holes 111 that can cooperate with the liner 120 are machined at both ends of the shaft body 110 by milling or turning.

[0056] Step S200 : preheating both ends of the shaft body 110 , and pressing the liner 120 into the stepped hole 111 of the shaft body 110 to form the shaft body component 100 .

[0057] Since the shaft body 110 and the liner 120 need to be interference fit, both ends of the shaft body 110 need to be preheated, and the liner 120 needs to be pressed into the stepped hole 111 of the shaft body 110 to form an integral structure.

[0058] Step S300: preheating both ends of the shaft component 100 and pressing the shaft component 100 into the bending neck 200; after correcting the bending neck 200 and the shaft component 100, welding the connection between the bending neck 200 and the shaft component 100.

[0059] It can be understood that after the integral structure formed by the shaft body 110 and the liner 120 is installed into the existing bending neck 200 on the market, after the bending neck 200 and the shaft body component 100 are corrected, a circle is welded along the circumference at the connection between the bending neck 200 and the shaft body 110 of the shaft body component 100.

[0060] In some embodiments of the present invention, after preheating both ends of the shaft body 110 and pressing the liner 120 into the mating surface of the shaft body 110, the following steps are further included: After the liner 120 and the shaft body 110 are cooled, the connection between the liner 120 and the shaft body 110 is welded; After welding, the liner 120 and the shaft body 110 are processed to form an assembly surface 121 on the surface of the liner 120 .

[0061] This is equivalent to staggering the assembly surface 121 between the liner 120 and the bent neck 200 and the welding surface 122 between the shaft body 110 and the liner 120 .

[0062] Since the main deformation of the liner 120 when subjected to force is shearing, adjacent cross sections are prone to displacement. By staggering the assembly surface 121 of the neck 200 and the liner 120, and the welding surface 122 of the shaft body 110 and the liner 120, stress concentration on the liner 120 can be avoided, ensuring that the shaft body component has a strong structural stability.

[0063] In some embodiments of the present invention,

[0064] After welding the connection between the bending neck 200 and the shaft body component 100, the welding position of the bending neck 200 and the shaft body component 100 is annealed to eliminate welding stress.

[0065] In some embodiments of the present invention, the method for manufacturing a front axle assembly further includes: Position and fix the upper support 310 on the shaft body 110, and perform fillet welding on the front and rear welding grooves of the upper support 310, leaving 5-10mm at the ends; position and fix the lower support 320 on the shaft body 110, and perform fillet welding on the front and rear welding grooves of the upper support 310, leaving 5-10mm at the ends.

[0066] The innovative features of the front axle assembly provided by the embodiment of the present invention are: Firstly, the bending neck 200 is formed by forging or casting, which is similar to the structure of the conventional bending neck 200, especially the fist part is universal, which solves the universality problem of the steering knuckle and wheel edge of the highway bridge.

[0067] Secondly, the shaft body 110 of the circular tube structure is welded and positioned after interference fit with the annular liner 120, and the assembly surface 121 is processed on the outer circumferential surface of the liner 120. The assembly surface 121 is staggered with the weld to avoid stress concentration on the liner 120 and ensure that the shaft component 100 has strong structural stability.

[0068] The present invention also provides a working machine, comprising a steering knuckle, a wheel hub and any one of the front axle components, wherein the steering knuckle is arranged on the front axle component, and the wheel hub is arranged on the steering knuckle.

[0069] The working machine provided by the present invention has all the above advantages because it includes the above front axle assembly.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A front axle assembly, characterized in that: include: The shaft component (100) comprises a shaft body (110) and a liner (120), wherein the shaft body (110) is a round tube, and the shaft body (110) is provided with a first end and a second end opposite to each other along its axial direction; the liner (120) is provided on at least one of the first end and the second end, and the liner (120) is interference-fitted with the shaft body (110) and is fixed to the shaft body (110) by welding; A bent neck (200) is provided at both ends of the shaft body component (100); the bent neck (200) is respectively interference-fitted with the liner (120) and the shaft body (110), and is fixed to the shaft body (110) by welding.

2. The front axle assembly according to claim 1, characterized in that: The outer circumferential surface of the liner (120) is formed with a welding surface (122) for welding to the shaft body (110); the outer circumferential surface of the liner (120) is formed with an assembly surface (121) for interference fit with the bent neck (200), and the assembly surface (121) and the welding surface (122) are arranged in a staggered manner.

3. The front axle assembly according to claim 1, characterized in that: The shaft body (110) is a seamless steel pipe; the liner (120) is any one of a pipe body and a shaft body.

4. The front axle assembly according to claim 1, characterized in that: The outer diameter of the shaft body (110) is 154 mm to 164 mm, and the inner diameter of the shaft body (110) is 114 mm to 124 mm.

5. The front axle assembly according to claim 1, characterized in that: It also includes a leaf spring support (300), the leaf spring support (300) including an upper support (310) and a lower support (320), the upper support (310) and the lower support (320) being relatively clamped on the outside of the shaft body (110), and the upper support (310) and the lower support (320) being welded.

6. A method for manufacturing a front axle assembly according to any one of claims 1 to 5, characterized in that: The steps include: A seamless steel pipe of a preset length is cut to serve as a shaft body (110), and a stepped hole (111) is machined at at least one end of the shaft body (110); Preheating both ends of the shaft body (110), and pressing a liner (120) into the stepped hole (111) of the shaft body (110) to form a shaft body component (100); The two ends of the shaft component (100) are preheated, and the shaft component (100) is pressed into the bent neck (200); after the bent neck (200) and the shaft component (100) are corrected, the connection between the bent neck (200) and the shaft component (100) is welded.

7. The method for manufacturing a front axle assembly according to claim 6, characterized in that: After preheating both ends of the shaft body (110) and pressing the liner (120) into the stepped hole (111) of the shaft body (110), the method further comprises: After the liner (120) and the shaft body (110) have cooled, welding the connection between the liner (120) and the shaft body (110); After welding is completed, the liner (120) and the shaft body (110) are processed to form an assembly surface (121) on the surface of the liner (120).

8. The method for manufacturing a front axle assembly according to claim 6, characterized in that: After welding the connection between the bent neck (200) and the shaft body component (100), annealing treatment is performed on the welding position between the bent neck (200) and the shaft body component (100).

9. The method for manufacturing a front axle assembly according to claim 6, characterized in that: Also includes: The upper support (310) is positioned and fixed on the shaft body (110), and the front and rear welding grooves of the upper support (310) are fillet welded, with a 5-10 mm margin left at the end; the lower support (320) is positioned and fixed on the shaft body (110), and the front and rear welding grooves of the upper support (310) are fillet welded, with a 5-10 mm margin left at the end.

10. A working machine, characterized in that: The invention comprises a steering knuckle, a wheel hub and a front axle assembly according to any one of claims 1 to 5, wherein the steering knuckle is arranged on the front axle assembly, and the wheel hub is arranged on the steering knuckle.

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