Off-road heavy-load front axle and manufacturing method thereof

Abstract

The present invention provides an off-road heavy-duty front axle and a manufacturing method thereof, wherein the off-road heavy-duty front axle includes a front axle housing assembly, the front axle housing assembly includes a load-bearing plate beam and suspension accessories welded to the front axle housing, the load-bearing plate beam includes an upper plate, a lower plate, a front plate and a rear plate, and a through-type reinforcing rib plate is arranged on the upper plate and the lower plate near the inner cavity of the front axle housing assembly. The suspension accessories include a booster cylinder bracket, a shock absorber bracket and a hydraulic cylinder bracket, and the welding sequence of the suspension accessories is: first, the booster cylinder bracket is welded on the front plate, then the hydraulic cylinder bracket is welded above the upper plate, and finally the shock absorber bracket is welded to the rear plate and connected and fixed with the hydraulic cylinder bracket. The present application effectively improves the overall strength of the key position of the axle by setting a through-type reinforcing rib plate, and at the same time adopts a reasonable welding sequence and method of the suspension accessories to effectively reduce the welding stress, thereby effectively improving the bearing capacity of the axle.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts manufacturing, and in particular to an off-road heavy-load front axle and a manufacturing method thereof. Background Art

[0002] At present, off-road vehicles are gradually developing towards large-scale and specialized directions, and the requirements for vehicle load-bearing performance and safety performance are further improved; in the design of off-road axles, the design ideas of road vehicle axles are still referred to, and professional design is not carried out based on the working conditions of off-road heavy-duty vehicles, which leads to a high failure rate of axles in the off-road heavy-duty field, especially in the heavy-duty welded front axle housing technology;

[0003] At the same time, in order to fully improve the load-bearing capacity of the axle, oil-gas suspension has been widely used. However, the number of oil-gas suspension parts is large, which leads to an exponential increase in the number of welds on the welded front axle shell. The welding stress problem is more prominent, which seriously affects the load-bearing capacity and safety of the axle. Therefore, it is urgent to design a low-stress welding method for off-road heavy-load welded front axles to effectively improve the load-bearing capacity and safety of the axle. Summary of the invention

[0004] Therefore, the present invention provides an off-road heavy-duty front axle and a manufacturing method thereof, which can overcome the defects in the prior art that the number of welds on the welded front axle shell increases exponentially, the welding stress problem becomes more prominent, and the load-bearing capacity and safety of the axle are seriously affected.

[0005] In order to solve the above problems, the present invention provides an off-road heavy-duty front axle, including a front axle housing assembly, the front axle housing assembly is a curved beam structure formed by assembling and welding steel plates, the front axle housing assembly includes a load-bearing plate beam and suspension accessories, the load-bearing plate beam is formed by assembling and welding an upper plate, a lower plate, a front plate and a rear plate, the front plate and the rear plate are arranged between the upper plate and the lower plate, and both sides of the upper plate and the lower plate are provided with welding reserved positions for welding the front plate and the rear plate, and the upper plate and the lower plate are respectively ... The suspension accessories include a booster cylinder bracket, a shock absorber bracket and a hydraulic cylinder bracket. The booster cylinder bracket is fixedly arranged on the front plate, the shock absorber bracket is fixedly arranged on the rear plate, the hydraulic cylinder bracket is fixedly arranged on the upper plate, the shock absorber bracket includes a shock absorber bracket bottom plate, the shock absorber bracket bottom plate is provided with a first welding square hole, the hydraulic cylinder bracket includes a bent section and a straight section, and the bent section and the straight section are respectively provided with a second welding square hole.

[0006] In some embodiments, the front axle housing assembly is a hollow structure.

[0007] In some embodiments, the booster cylinder bracket includes a booster cylinder bracket base plate and two booster arms arranged in parallel and spaced apart on the same side of the booster cylinder bracket base plate. The booster arm is fixedly connected to the booster cylinder bracket base plate, and a booster arm connecting rib is provided between the two booster arms.

[0008] In some embodiments, the hydraulic cylinder support has a hydraulic cylinder support base plate and two hydraulic cylinder support vertical plates arranged in parallel and spaced apart on the same side of the hydraulic cylinder support base plate, and the hydraulic cylinder support base plate is fixedly connected to the hydraulic cylinder support vertical plate, and the hydraulic cylinder support vertical plate is provided with a hydraulic cylinder mounting hole and a hydraulic cylinder mounting hole reinforcement convex ring, the hydraulic cylinder support includes a first hydraulic cylinder support and a second hydraulic cylinder support, and the hydraulic cylinder support vertical plate of the second hydraulic cylinder support also has a transverse push support mounting hole and a transverse push support mounting hole reinforcement convex ring.

[0009] In some embodiments, the shock absorber bracket includes a shock absorber bracket base plate and two shock absorber bracket vertical plates arranged in parallel and at intervals on the same side of the shock absorber bracket base plate, a transverse reinforcing rib plate and a vertical reinforcing rib plate are arranged between the two shock absorber bracket vertical plates, an upper shock absorber mounting hole and a lower shock absorber mounting hole are arranged on the shock absorber bracket vertical plate, and an upper shock absorber mounting hole reinforcing convex ring and a lower shock absorber mounting hole reinforcing convex ring are arranged on the upper shock absorber mounting hole and the lower shock absorber mounting hole near the reinforcing rib plate.

[0010] The present invention also provides a method for manufacturing an off-road heavy-load front axle, wherein the suspension attachment is welded to the load-bearing plate beam, and the welding steps include:

[0011] Step 1: welding the booster cylinder bracket to the front plate, wherein the welding method between the booster cylinder bracket bottom plate and the front plate is circumferential welding or angle welding;

[0012] Step 2: Fix the hydraulic cylinder support to the upper plate by circumferential welding through the second welding square hole, first weld and fix the bent section of the bottom plate of the hydraulic cylinder support to the bent surface of the upper plate, then apply a certain pressure to the straight section of the bottom plate of the hydraulic cylinder support to make it fit with the straight surface of the upper plate, and then weld and fix the straight section of the bottom plate of the hydraulic cylinder support.

[0013] Step three: Weld the shock absorber bracket to the rear plate. The vertical plate of the shock absorber bracket has a connecting arm on the side close to the rear plate. First, weld and fix the connecting arm to the hydraulic cylinder bracket, and then perform circumferential welding on the first welding square hole to fix the shock absorber bracket base plate to the rear plate. Finally, perform angle welding on the outer peripheral wall of the shock absorber bracket base plate. No welding is required on the side close to the upper plate.

[0014] In some embodiments, the minimum distance between the bottom plate of the booster cylinder bracket and the upper plate is L1, the minimum distance between the bottom plate of the booster cylinder bracket and the lower plate is L2, and the reserved weld groove height of the front plate is H;

[0015] When L1 < H, the welding method between the bottom plate of the booster cylinder bracket and the front plate is fillet welding, and the welding on the side of the bottom plate of the booster cylinder bracket close to the upper plate is cancelled;

[0016] When L2 < H, the welding method between the bottom plate of the booster cylinder bracket and the front plate is fillet welding, and the welding on the side of the bottom plate of the booster cylinder bracket close to the lower plate is cancelled;

[0017] When L1 > H and L2 > H, the welding method between the bottom plate of the booster cylinder bracket and the front plate is circumferential welding.

[0018] In some embodiments, when the welding method between the bottom plate of the booster cylinder bracket and the front plate is fillet welding, the distance between the starting position of the weld and the reserved weld groove of the front plate is greater than 10 mm.

[0019] A non-road heavy-duty front axle and a manufacturing method thereof provided by the present invention. The non-road heavy-duty front axle includes a front axle housing assembly. The front axle housing assembly includes a load-bearing plate beam and suspension accessories welded to the front axle housing. The load-bearing plate beam includes an upper plate, a lower plate, a front plate and a rear plate, and a through-type stiffening rib plate is arranged on the side of the upper plate and the lower plate close to the inner cavity of the front axle housing assembly. The suspension accessories include a booster cylinder bracket, a shock absorber bracket and a hydraulic cylinder bracket. The welding sequence of the suspension accessories is as follows: first, the booster cylinder bracket is welded on the front plate, then the hydraulic cylinder bracket is welded above the upper plate, and finally the shock absorber bracket is welded to the rear plate and connected and fixed to the hydraulic cylinder bracket; this application can be applied to non-road heavy-duty vehicles with an oil-gas suspension chassis. By setting a through-type stiffening rib plate, the overall strength of the key positions of the axle is effectively improved. At the same time, by adopting a reasonable welding sequence and method for the suspension accessories, the welding stress is effectively reduced, thereby effectively improving the load-bearing capacity of the axle. The front axle housing adopts a bent beam structure, which effectively reduces the overall center of gravity of the axle, and further enables the vehicle to meet more excellent anti-rollover performance and meet the use requirements of harsh working conditions. The steel plate welding process is adopted, and there is no need to develop relevant molds, and the production and manufacturing process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the non-road heavy-duty front axle according to the embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the wheel-end assembly of the non-road heavy-duty front axle according to the embodiment of the present invention;

[0022] Figure 3It is a schematic diagram of the front side structure of the front axle housing assembly of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the rear side structure of the front axle housing assembly of an off-road heavy-duty front axle according to an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the axial cross-sectional structure of the front axle housing assembly of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the radial cross-sectional structure of the front axle housing assembly of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of a booster cylinder bracket for an off-road heavy-duty front axle according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the first hydraulic cylinder support of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0028] Fig. 9 This is a schematic diagram of the structure of the second hydraulic cylinder support of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0029] Fig.10 It is a schematic diagram of the structure of a shock absorber bracket for an off-road heavy-duty front axle according to an embodiment of the present invention;

[0030] Fig.11 This is a schematic diagram of a welding structure between a booster cylinder bracket and a front plate of an off-road heavy-duty front axle according to an embodiment of the present invention;

[0031] Fig.12 This is a second schematic diagram of the welding structure between the booster cylinder bracket and the front plate of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0032] Fig.13 This is a third schematic diagram of the welding structure between the booster cylinder bracket and the front plate of the off-road heavy-duty front axle according to an embodiment of the present invention;

[0033] Fig.14 It is a schematic diagram of welding of a hydraulic cylinder bracket of an off-road heavy-duty front axle according to an embodiment of the present invention;

[0034] Fig.15 It is a schematic diagram of welding of a shock absorber bracket for an off-road heavy-duty front axle according to an embodiment of the present invention.

[0035] The reference numerals are:

[0036] 1. Wheel assembly; 1-1. Wheel hub assembly; 1-2. Brake assembly; 2. Front axle housing assembly; 2-1. Kingpin mounting seat; 2-2. Hydraulic cylinder bracket; 2-3. Shock absorber bracket; 2-4. Upper plate; 2-6. Lower plate; 2-7. Front plate; 2-8. Bottom support cylinder bracket; 2-9. Stop block; 2-10. Rear plate; 2-11. Upper reinforcing rib plate; 2-12. Lower reinforcing rib plate; 2-2a. Hydraulic cylinder bracket bottom plate; 2-2b. Hydraulic cylinder bracket vertical plate; 2-2c. Hydraulic cylinder mounting hole reinforcing convex ring; 2-2d. Hydraulic cylinder mounting Hole; 2-2e, reinforcing convex ring of the horizontal push bracket mounting hole; 2-2f, horizontal push bracket mounting hole; 2-3a, vertical plate of the shock absorber bracket; 2-3b, bottom plate of the shock absorber bracket; 2-3c, lower shock absorber mounting hole; 2-3d, reinforcing convex ring of the lower shock absorber mounting hole; 2-3e, horizontal reinforcing rib plate; 2-3f, vertical reinforcing rib plate; 2-3g, reinforcing convex ring of the upper shock absorber mounting hole; 2-3h, upper shock absorber mounting hole; 2-3i, connecting arm; 2-8a, power-assisting arm; 2-8b, bottom plate of the power-assisting cylinder bracket; 2-8c, connecting rib of the power-assisting arm. DETAILED DESCRIPTION

[0037] See also Figures 1 to 15 As shown, according to an embodiment of the present invention, there is provided an off-road heavy-duty front axle, comprising a front axle housing assembly 2, wherein the front axle housing assembly 2 is a curved beam structure formed by assembling and welding steel plates, wherein the front axle housing assembly 2 comprises a load-bearing plate beam and suspension accessories, wherein the load-bearing plate beam is formed by assembling and welding an upper plate 2-4, a lower plate 2-6, a front plate 2-7 and a rear plate 2-10, wherein the front plate 2-7 and the rear plate 2-10 are arranged between the upper plate 2-4 and the lower plate 2-6, and both sides of the upper plate 2-4 and the lower plate 2-6 are provided with welding reserved positions for welding the front plate 2-7 and the rear plate 2-10, and the upper plate 2-4 and the lower plate 2-6 are respectively ... The suspension accessories include a booster cylinder bracket 2-8, a shock absorber bracket 2-3 and a hydraulic cylinder bracket 2-2. The booster cylinder bracket 2-8 is fixedly arranged on the front plate 2-7, the shock absorber bracket 2-3 is fixedly arranged on the rear plate 2-10, and the hydraulic cylinder bracket 2-2 is fixedly arranged on the upper plate 2-4. The shock absorber bracket 2-3 includes a shock absorber bracket bottom plate 2-3b, and the shock absorber bracket bottom plate 2-3b is provided with a first welding square hole. The hydraulic cylinder bracket 2-2 includes a bending section and a straight section, and the bending section and the straight section are respectively provided with a second welding square hole. The first welding square hole and the second welding square hole are provided to realize the welding form of circumferential welding, so that the welding strength is more reliable. At the same time, the stresses generated by the rectangular weld profile are more easily offset, thereby reducing the generation of concentrated stress and improving welding reliability.

[0038] Specifically, after the off-road heavy-load front axle is installed on the vehicle, the vehicle runs in the forward direction and the opposite direction is the backward direction.

[0039] Specifically, the front plate 2-7 is provided with limit blocks 2-9 for steering limit at positions close to the kingpin mounting seat 2-1.

[0040] Specifically, the off-road heavy-duty front axle further includes a wheel rim assembly 1, wherein the wheel rim assembly 1 includes a wheel hub assembly 1-1 and a brake assembly 1-2, wherein the brake assembly 1-2 is a drum brake, or a disc brake, or a wet brake.

[0041] In a specific embodiment, the front axle housing assembly 2 is a hollow structure.

[0042] In a specific embodiment, the booster cylinder bracket 2-8 includes a booster cylinder bracket base plate 2-8b and two booster arms 2-8a arranged in parallel and spaced apart on the same side of the booster cylinder bracket base plate 2-8b. The booster arm 2-8a is fixedly connected to the booster cylinder bracket base plate 2-8b, and a booster arm connecting rib 2-8c is provided between the two booster arms 2-8a.

[0043] In a specific embodiment, the hydraulic cylinder support 2-2 has a hydraulic cylinder support base plate 2-2a and two hydraulic cylinder support vertical plates 2-2b arranged in parallel and at intervals on the same side of the hydraulic cylinder support base plate 2-2a, and the hydraulic cylinder support base plate 2-2a is fixedly connected to the hydraulic cylinder support vertical plate 2-2b, and the hydraulic cylinder support vertical plate 2-2b is provided with a hydraulic cylinder mounting hole 2-2d and a hydraulic cylinder mounting hole reinforcement convex ring 2-2c, and the hydraulic cylinder support 2-2 includes a first hydraulic cylinder support and a second hydraulic cylinder support, and the hydraulic cylinder support vertical plate 2-2b of the second hydraulic cylinder support also has a transverse push support mounting hole 2-2f and a transverse push support mounting hole reinforcement convex ring 2-2e.

[0044] In a specific embodiment, the shock absorber bracket 2-3 includes a shock absorber bracket base plate 2-3b and two shock absorber bracket vertical plates 2-3a arranged in parallel and at intervals on the same side of the shock absorber bracket base plate 2-3b, a transverse reinforcing rib plate 2-3e and a vertical reinforcing rib plate 2-3f are arranged between the two shock absorber bracket vertical plates 2-3a, an upper shock absorber mounting hole 2-3h and a lower shock absorber mounting hole 2-3c are arranged on the shock absorber bracket vertical plate 2-3a, and an upper shock absorber mounting hole reinforcing convex ring 2-3g and a lower shock absorber mounting hole reinforcing convex ring 2-3d are arranged on the upper shock absorber mounting hole 2-3h and the lower shock absorber mounting hole 2-3c near the reinforcing rib plate.

[0045] Specifically, the first end of the transverse reinforcing rib plate 2-3e is connected to the shock absorber bracket bottom plate 2-3b, the two opposite side walls adjacent to the first end are respectively connected to the two shock absorber bracket vertical plates 2-3a, and the two opposite side walls of the vertical reinforcing rib plate 2-3f are respectively connected to the two shock absorber bracket vertical plates 2-3a.

[0046] The present invention also provides a method for manufacturing an off-road heavy-load front axle, wherein the suspension attachment is welded to the load-bearing plate beam, and the welding steps include:

[0047] Step 1: Weld the booster cylinder bracket 2-8 to the front plate 2-7, and the welding method between the booster cylinder bracket bottom plate 2-8b and the front plate 2-7 is circumferential welding or angle welding;

[0048] Step 2: Fix the hydraulic cylinder support 2-2 and the upper plate 2-4 by circumferential welding through the second welding square hole, first weld and fix the bent section of the hydraulic cylinder support bottom plate 2-2a and the bent surface of the upper plate 2-4, then apply a certain pressure to the straight section of the hydraulic cylinder support bottom plate 2-2a to make it fit with the straight surface of the upper plate 2-4, and then weld and fix the straight section of the hydraulic cylinder support bottom plate 2-2a.

[0049] Step 3: Weld the shock absorber bracket 2-3 to the rear plate 2-10. The side of the shock absorber bracket vertical plate 2-3a close to the rear plate 2-10 has a connecting arm 2-3i. First, weld and fix the connecting arm 2-3i to the hydraulic cylinder bracket 2-2, and then perform circumferential welding on the first welding square hole to fix the shock absorber bracket bottom plate 2-3b to the rear plate 2-10. Finally, perform angle welding on the outer peripheral wall of the shock absorber bracket bottom plate 2-3b. No welding is required on the side close to the upper plate 2-4. There is line contact between the connecting arm 2-3i and the hydraulic cylinder bracket 2-2, and the welding area is relatively small, and the welding strength is small; while there is surface contact between 2-3b and the rear plate 2-10, and the weld area is large, and the welding strength is large. If the shock absorber bracket bottom plate 2-3b is welded first and then the connecting arm 2-3i is welded, the problem of the deviation being difficult to adjust due to the welding error of the shock absorber bracket bottom plate 2-3b will occur, which will cause the welding position of the connecting arm 2-3i to be inaccurate; while welding the connecting arm 2-3i first will facilitate adjustment because the welding strength between the connecting arm 2-3i and the hydraulic cylinder bracket 2-2 is relatively small, thereby improving the installation accuracy of the shock absorber bracket 2-3. At the same time, the method of not requiring welding on the side close to the upper plate 2-4 can effectively avoid the welding of the shock absorber bracket 2-3 affecting the connection strength of the weld between the upper plate 2-4 and the rear plate 2-10, that is, reducing the stress concentration phenomenon generated between the welds, thereby improving the strength and effectively improving the bearing performance of the front axle housing.

[0050] In a specific embodiment, the minimum distance between the bottom plate 2-8b of the assist cylinder bracket and the upper plate 2-4 is L1, the minimum distance between the bottom plate 2-8b of the assist cylinder bracket and the lower plate 2-6 is L2, and the reserved weld groove height of the front plate 2-7 is H;

[0051] When L1 < H, the welding method between the bottom plate 2-8b of the assist cylinder bracket and the front plate 2-7 is angle welding, and the welding on the side of the bottom plate 2-8b close to the upper plate 2-4 is cancelled.

[0052] When L2 < H, the welding method between the bottom plate 2-8b of the assist cylinder bracket and the front plate 2-7 is angle welding, and the welding on the side of the bottom plate 2-8b close to the lower plate 2-6 is cancelled. By adopting the angle welding method, while ensuring the welding strength of the assist cylinder bracket 2-8, the influence of the welding of the assist cylinder bracket 2-8 on the strength of the welds between the front plate 2-7 and the upper plate 2-4 and the lower plate 2-6 is effectively avoided, the welding strength between the upper / lower plate and the front plate is improved, and the load-bearing capacity and safety of the axle are effectively improved.

[0053] When L1 > H and L2 > H, the welding method between the bottom plate 2-8b of the assist cylinder bracket and the front plate 2-7 is circumferential welding.

[0054] In a specific embodiment, when the welding method between the bottom plate 2-8b of the assist cylinder bracket and the front plate 2-7 is angle welding, the distance between the starting position of the weld and the reserved weld groove of the front plate 2-7 is greater than 10 mm.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can still be made, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A method for manufacturing an off-road heavy-duty front axle, characterized in that: The invention comprises a front axle housing assembly (2), wherein the front axle housing assembly (2) is a curved beam structure formed by assembling and welding steel plates, wherein the front axle housing assembly (2) comprises a load-bearing plate beam and a suspension accessory, wherein the load-bearing plate beam is formed by assembling and welding an upper plate (2-4), a lower plate (2-6), a front plate (2-7) and a rear plate (2-10), wherein the front plate (2-7) and the rear plate (2-10) are arranged between the upper plate (2-4) and the lower plate (2-6), and the upper plate (2-4) and the lower plate (2-6) are both provided with welded The front plate (2-7) and the rear plate (2-10) are welded in place, the upper plate (2-4) and the lower plate (2-6) have upper reinforcing rib plates (2-11) and lower reinforcing rib plates (2-12) on opposite side walls, the suspension accessories include a booster cylinder bracket (2-8), a shock absorber bracket (2-3) and a hydraulic cylinder bracket (2-2), the booster cylinder bracket (2-8) is fixedly arranged on the front plate (2-7), the shock absorber bracket (2-3) is fixedly arranged on the rear plate (2-10), and the hydraulic cylinder bracket (2-2) is fixedly arranged on the upper plate (2-4), the shock absorber bracket (2-3) comprises a shock absorber bracket bottom plate (2-3b), the shock absorber bracket bottom plate (2-3b) is provided with a first welding square hole, the hydraulic cylinder bracket (2-2) comprises a bent section and a straight section, the bent section and the straight section are respectively provided with a second welding square hole, the shock absorber bracket (2-3) comprises a shock absorber bracket bottom plate (2-3b) and two shock absorber bracket vertical plates arranged in parallel and spaced apart on the same side of the shock absorber bracket bottom plate (2-3b). A plate (2-3a), a transverse reinforcing rib plate (2-3e) and a vertical reinforcing rib plate (2-3f) are arranged between the two shock absorber bracket vertical plates (2-3a), an upper shock absorber mounting hole (2-3h) and a lower shock absorber mounting hole (2-3c) are arranged on the shock absorber bracket vertical plate (2-3a), and an upper shock absorber mounting hole reinforcing convex ring (2-3g) and a lower shock absorber mounting hole reinforcing convex ring (2-3d) are arranged on one side of the upper shock absorber mounting hole (2-3h) and the lower shock absorber mounting hole (2-3c) close to the reinforcing rib plate; The suspension attachment is welded to the load-bearing plate beam, and the welding steps include: Step 1: welding the booster cylinder bracket (2-8) to the front plate (2-7), wherein the welding method between the booster cylinder bracket bottom plate (2-8b) and the front plate (2-7) is circumferential welding or angle welding; Step 2: The hydraulic cylinder support (2-2) and the upper plate (2-4) are fixed by circumferential welding through the second welding square hole, the bent section of the hydraulic cylinder support bottom plate (2-2a) and the bent surface of the upper plate (2-4) are first welded and fixed, and then a certain pressure is applied to the straight section of the hydraulic cylinder support bottom plate (2-2a) so that it fits with the straight surface of the upper plate (2-4), and then the straight section of the hydraulic cylinder support bottom plate (2-2a) is welded and fixed; Step 3: Weld the shock absorber bracket (2-3) to the rear plate (2-10). The vertical plate (2-3a) of the shock absorber bracket has a connecting arm (2-3i) on the side close to the rear plate (2-10). First, weld and fix the connecting arm (2-3i) to the hydraulic cylinder bracket (2-2), and then perform circumferential welding on the first welding square hole to fixedly connect the bottom plate (2-3b) of the shock absorber bracket to the rear plate (2-10). Finally, perform angular welding on the outer peripheral wall of the bottom plate (2-3b) of the shock absorber bracket, and no welding is required on the side close to the upper plate (2-4).

2. The method for manufacturing an off-road heavy-duty front axle according to claim 1, characterized in that: The front axle housing assembly (2) is a hollow structure.

3. The method for manufacturing an off-road heavy-duty front axle according to claim 1, characterized in that: The booster cylinder bracket (2-8) includes a booster cylinder bracket bottom plate (2-8b) and two booster arms (2-8a) arranged in parallel and spaced apart on the same side of the booster cylinder bracket bottom plate (2-8b). The booster arms (2-8a) are fixedly connected to the booster cylinder bracket bottom plate (2-8b), and there is a booster arm connecting rib (2-8c) between the two booster arms (2-8a).

4. The method for manufacturing an off-road heavy-duty front axle according to claim 1, characterized in that: The hydraulic cylinder bracket (2-2) has a hydraulic cylinder bracket bottom plate (2-2a) and two hydraulic cylinder bracket vertical plates (2-2b) arranged in parallel and spaced apart on the same side of the hydraulic cylinder bracket bottom plate (2-2a). The hydraulic cylinder bracket bottom plate (2-2a) is fixedly connected to the hydraulic cylinder bracket vertical plates (2-2b). The hydraulic cylinder bracket vertical plates (2-2b) are provided with hydraulic cylinder mounting holes (2-2d) and hydraulic cylinder mounting hole reinforcing rings (2-2c). The hydraulic cylinder bracket (2-2) includes a first hydraulic cylinder bracket and a second hydraulic cylinder bracket. The hydraulic cylinder bracket vertical plate (2-2b) of the second hydraulic cylinder bracket also has a transverse push bracket mounting hole (2-2f) and a transverse push bracket mounting hole reinforcing ring (2-2e).

5. The method for manufacturing an off-road heavy-duty front axle according to claim 1, characterized in that: The minimum distance between the booster cylinder bracket bottom plate (2-8b) and the upper plate (2-4) is L1, the minimum distance between the booster cylinder bracket bottom plate (2-8b) and the lower plate (2-6) is L2, and the reserved weld groove height of the front plate (2-7) is H; When L1 < H, the welding method between the booster cylinder bracket bottom plate (2-8b) and the front plate (2-7) is angular welding, and welding is cancelled on the side of the booster cylinder bracket bottom plate (2-8b) close to the upper plate (2-4); When L2 < H, the welding method between the booster cylinder bracket bottom plate (2-8b) and the front plate (2-7) is angular welding, and welding is cancelled on the side of the booster cylinder bracket bottom plate (2-8b) close to the lower plate (2-6); When L1 > H and L2 > H, the welding method between the booster cylinder bracket bottom plate (2-8b) and the front plate (2-7) is circumferential welding.

6. The method for manufacturing an off-road heavy-duty front axle according to claim 5, characterized in that: When the welding method between the booster cylinder bracket bottom plate (2-8b) and the front plate (2-7) is angular welding, the distance between the starting position of the weld and the reserved weld groove of the front plate (2-7) is greater than 10 mm.

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