Front overhang foundation assembly of heavy-duty commercial vehicle

Abstract

The invention relates to the technical field of commercial vehicle chassis, in particular to a heavy commercial vehicle front overhang foundation assembly which comprises a frame, a left bearing frame and a right bearing frame are fixedly mounted on the two sides of the front end of the frame respectively, bent connecting parts are arranged at the rear ends of the left bearing frame and the right bearing frame, and a front bent beam is fixedly mounted between the two bent connecting parts. A front traction beam is installed between the left bearing frame and the right bearing frame in a fastening mode, a hook pin shaft is installed on the front traction beam, positioning supports are fixedly connected to the bottoms of the front ends of the left bearing frame and the right bearing frame, a protection plate is connected between the two positioning supports in a fastening mode, and the rear side of the protection plate is connected with a front bent beam in a fastening mode. And protective beams are fixedly mounted at the front ends of the two positioning brackets. The torsion-resistant box body structure is arranged in the front overhang foundation assembly, the stability of the front overhang foundation assembly can be enhanced through the structure, the number of installation parts is reduced, the assembly technological process is simplified, meanwhile, installation errors are reduced, the development period is greatly shortened, and the development and production cost is controlled.

Description

Technical Field

[0001] The invention relates to the technical field of commercial vehicle chassis, and in particular discloses a front suspension base assembly of a heavy-duty commercial vehicle. Background Art

[0002] Traditional commercial vehicle front structure designs generally adopt a decentralized layout, and various functional components (such as steering system, bumper, traction beam, cooling system, front lower bending beam, front anti-drilling, etc.) are independently installed on the frame longitudinal beam or cross beam, resulting in structural redundancy and inefficient assembly; independently installed cooling system, steering gear and other components occupy a large space, resulting in complex pipeline layout (pipeline length increased by 30%) and high risk of leakage. Traditional steel brackets are heavy (total weight of the front structure ≥120kg), and redundant materials need to be added to meet strength requirements, further exacerbating the contradiction between lightweight and strength; although some aluminum alloy modular solutions can reduce weight, the yield strength is ≤250MPa, which cannot withstand traction conditions and braking impact loads.

[0003] The above-mentioned decentralized layout design is very prone to dimensional error accumulation. The assembly errors of individual components will make it difficult for the overall product to meet production standards. For example, decentralized installation leads to the superposition of dimensional chain tolerances, and the centering error of the steering system is ≥1.5mm, which affects the handling stability. In addition, when producing models with different wheelbases, the decentralized layout design method requires the redesign of the traction beam and bracket, which will increase the development cycle by more than 5 months and increase the cost by 40%. At the same time, in the decentralized layout design method, the connection between the suspension support and the frame is prone to stress concentration due to sudden load changes, which in turn causes fatigue failure and other problems. From the above, it can be seen that the front structure of commercial vehicles urgently needs a highly integrated, lightweight, high-precision and multi-model common design assembly to balance the production requirements of structural strength, assembly efficiency and cost control. Summary of the invention

[0004] In view of the problem that the front structure of a current commercial vehicle has poor assembly accuracy and structural strength, the present invention provides a front suspension base assembly for a heavy-duty commercial vehicle.

[0005] To solve the above problems, the present invention provides the following technical solutions: A front suspension basic assembly of a heavy-duty commercial vehicle comprises a frame, wherein a left-side load-bearing frame and a right-side load-bearing frame are fixedly installed on both sides of the front end of the frame, and a bent portion is provided on the inner sides of the rear ends of the left-side load-bearing frame and the right-side load-bearing frame, respectively, and a front bending beam is fixedly installed between the two bent portions, a front traction beam is fastenedly installed between the left-side load-bearing frame and the right-side load-bearing frame, a hook pin shaft is installed on the front traction beam, a positioning bracket is fixedly connected to the bottom of the front ends of the left-side load-bearing frame and the right-side load-bearing frame, a protective plate is fastenedly connected between the two positioning brackets, the protective plate is arranged below the front traction beam, the rear side of the protective plate is fastenedly connected to the front bending beam, a C-shaped frame is fixedly installed on the front ends of the two positioning brackets, the inner groove surfaces of the two C-shaped frames are fastenedly connected together with the protective beam, and the protective beam is arranged below the protective plate.

[0006] Preferably, the left-side load-bearing frame and the right-side load-bearing frame are both provided with a loading part, a middle supporting part and a lower connecting part, the middle supporting part and the lower connecting part are both provided with through grooves, and the bent part is provided on the side of the loading part; a plurality of first mounting holes are provided at the outer edge and the center of the loading part, the frame is a C-beam structure, a plurality of evenly arranged reference holes are provided on the belly surface of the frame, the aperture size of the reference holes corresponds to the first mounting holes, a reinforcement hole is provided on the lower flange surface of the frame, a second mounting hole is provided on the bent part, and the aperture size of the second mounting hole corresponds to the reinforcement hole.

[0007] Preferably, a plurality of laterally arranged swing arm connection holes are provided on the top of the loading part, a first steering machine connection hole is provided between the swing arm connection hole and the first mounting hole, a first leaf spring connection hole and a second leaf spring connection hole are respectively provided on the bottom of the loading part and the bending part, and the arrangement height and aperture size of the first leaf spring connection hole and the second leaf spring connection hole are the same.

[0008] Preferably, a second steering machine connection hole is provided on the middle supporting part, and both the second steering machine connection hole and the first steering machine connection hole are deep groove hole structures; a first lower bracket connection hole is provided on the front side of the second steering machine connection hole, and a second lower bracket connection hole provided on the side of the front traction beam is provided on the inner side of the first lower bracket connection hole, and the arrangement height and aperture size of the second lower bracket connection hole and the first lower bracket connection hole are the same; a limited bracket connection hole and a first heat dissipation bracket connection hole are provided on the top of the middle supporting part; a front traction beam connection hole is provided on the front end of the middle supporting part, and a connecting hole provided on the front traction beam is provided on the front side of the front traction beam connection hole, and the connecting hole corresponds to the front traction beam connection hole.

[0009] Preferably, a first positioning hole is formed in the lower connecting part. Second positioning holes are provided on both sides of the first positioning hole and are formed in the positioning bracket. An ear plate is arranged inside the positioning bracket. The bottom end of the ear plate is firmly connected to the protection plate. A third positioning hole is arranged at the top of the ear plate. The first positioning hole, the second positioning hole, and the third positioning hole have the same aperture size. A second heat dissipation bracket connection hole is formed at the rear end of the lower connecting part.

[0010] Preferably, the arrangement heights at both ends of the front bent beam are higher than the middle part thereof. A bending part is arranged at the outer edge of the front bent beam. First bending connection holes are formed at both side parts of both ends of the front bent beam. Second bending connection holes are provided on both sides of the bending part. The second bending connection holes are all arranged inside the first bending connection holes and have the same aperture size as the first bending connection holes. A groove with an opening facing downwards is arranged inside the front bent beam. The rear side of the protection plate is arranged inside the groove and is firmly connected to the inner groove surface of the groove.

[0011] Preferably, traction hook connection holes are formed at both ends of the front traction beam. The traction hook connection holes are arranged inside the connection holes. A ventilation groove is arranged in the middle of the front traction beam. A hook pin shaft is vertically arranged inside the ventilation groove. A locking sleeve is fixedly installed at the top of the hook pin shaft. The locking sleeve is arranged above the front traction beam and a handle is fixedly installed on the outer wall thereof.

[0012] Preferably, the positioning bracket is of an integral structure. A plurality of strip-shaped grooves are formed in the positioning bracket. A welding part is arranged at the front end of the positioning bracket. The welding part is arranged above the C-shaped frame.

[0013] Preferably, a first bolt connection hole is formed in the web surface of the C-shaped frame. A second bolt connection hole is formed at the bottom of the positioning bracket. The second bolt connection hole and the first bolt connection hole have the same arrangement height. The projected area of the second bolt connection hole is larger than the projected area of the first bolt connection hole. A plurality of welding filling holes are formed in the upper and lower flange surfaces of the C-shaped frame.

[0014] Preferably, the protection beam is of an integral structure. The middle part of the protection beam is a straight structure. Both ends of the protection beam are symmetrically bent structures and the bending directions are towards the vehicle frame. First and second crush energy absorption cavities are arranged inside the protection beam. The first and second crush energy absorption cavities are arranged up and down and are isolated from each other. The contact surfaces where the first and second crush energy absorption cavities are in contact are all rounded corner structures.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The front suspension basic assembly in the present invention adopts a split modular design structure. On the one hand, the left-side load frame, the right-side load frame and the front traction beam form a torsion-resistant box structure, which can not only enhance the stability of the front suspension basic assembly, but also reduce the number of installed parts, simplify the assembly process, and greatly improve the overall assembly efficiency; on the other hand, the present invention designs the left-side load frame and the right-side load frame as an integral assembly structure, which can reduce the error in the decentralized structure to within a controllable range; furthermore, the present invention can flexibly install the front suspension components of heavy-duty commercial vehicles with the left-side load frame and the right-side load frame, thereby achieving a parametric model library and a modular interface design method, realizing rapid modification of various vehicle platforms, greatly shortening the development cycle, and controlling development and production costs, and therefore has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a schematic diagram of the isometric structure of the overall assembly of the present invention; Figure 2 It is a schematic diagram of the top view of the overall assembly of the present invention; Figure 3 It is a schematic diagram of the frame structure of the present invention; Figure 4 The left side support frame structure of the present invention is schematically shown Figure 1 ; Figure 5 The left side support frame structure of the present invention is schematically shown Figure 2 ; Figure 6 It is a schematic diagram of the installation structure of the front curved beam and the protective plate of the present invention; Figure 7 It is a schematic diagram of the front traction beam structure of the present invention; Figure 8 It is a schematic diagram of the installation structure of the positioning bracket and the protection beam of the present invention; Fig. 9 It is a schematic diagram of the installation structure of the positioning bracket and the C-shaped frame of the present invention; Fig.10 It is a schematic diagram of the positioning bracket structure of the present invention; Fig.11 It is a schematic diagram of the C-type frame structure of the present invention; In the figure: 1. frame, 2. left side bearing frame, 3. right side bearing frame, 4. bending part, 5. front bending beam, 6. front traction beam, 7. hook pin shaft, 8. positioning bracket, 9. protective plate, 10. C-shaped frame, 11. protective beam, 12. loading part, 13. middle bearing part, 14. lower connecting part, 15. through slot, 16. first mounting hole, 17. reference hole, 18. reinforcement hole, 19. second mounting hole, 20. swing arm connecting hole, 21. first steering machine connecting hole, 22. first leaf spring connecting hole, 23. second leaf spring connecting hole, 24. second steering machine connecting hole, 25. first lower bracket connecting hole, 26. second lower bracket connecting hole, 2 7. Limit bracket connection hole, 28. First heat dissipation bracket connection hole, 29. Front traction beam connection hole, 30. Connection hole, 31. First positioning hole, 32. Second positioning hole, 33. Ear plate, 34. Third positioning hole, 35. Second heat dissipation bracket connection hole, 36. Bending portion, 37. First bend connection hole, 38. Second bend connection hole, 39. Groove, 40. Towing hook connection hole, 41. Ventilation groove, 42. Locking sleeve, 43. Handle, 44. Strip groove, 45. Welding portion, 46. First bolt connection hole, 47. Second bolt connection hole, 48. Welding filling hole, 49. First collapse energy absorption cavity, 50. Second collapse energy absorption cavity. DETAILED DESCRIPTION

[0017] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only 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.

[0018] This specific embodiment provides a front suspension base assembly for a heavy-duty commercial vehicle, such as Figure 1-Figure 11 As shown; it includes a frame 1, a left-side load-bearing frame 2, a right-side load-bearing frame 3, a front bending beam 5, a front traction beam 6, two positioning brackets 8, a protective plate 9, and a protective beam 11. The frame 1 is formed by two longitudinal beams and a plurality of cross beams being fastened and welded. The two longitudinal beams of the frame 1 are both C-beam structures, and the frame 1 in the present invention is the front end part structure thereof. The left-side load-bearing frame 2 and the right-side load-bearing frame 3 are symmetrically arranged and fixedly installed on both sides of the front end of the frame 1. The left-side load-bearing frame 2 and the right-side load-bearing frame 3 have the same structure, and both are the main connection structures between the frame 1 and the front suspension base assembly.

[0019] The left-side bearing frame 2 and the right-side bearing frame 3 can be integrally cast with QT700-10 high-grade ductile iron, so that the tensile strength is ≥700MPa and the elongation is ≥10%. The left-side bearing frame 2 and the right-side bearing frame 3 are both provided with a loading part 12, a middle supporting part 13, a lower connecting part 14, and a bending part 4. The middle supporting part 13 and the lower connecting part 14 are both provided with a through groove 15, and the design structure of the through groove 15 is mainly designed to achieve lightweight; the bending part 4 is arranged on the side of the loading part 12. Reinforcing ribs are arranged between the loading part 12, the middle supporting part 13, the lower connecting part 14, and the bending part 4, so as to increase the stability of the overall structure.

[0020] A plurality of first mounting holes 16 are provided at the outer edge and the center of the loading portion 12. Figure 4 , 5 As shown, there are 11 first mounting holes 16 in total, and a plurality of evenly arranged reference holes 17 are provided on the ventral surface of the longitudinal beam of the frame 1, and the aperture size of the reference holes 17 corresponds to that of the first mounting holes 16; a reinforcement hole 18 is provided on the lower flange surface of the frame 1, and a second mounting hole 19 is provided on the top of the bent portion 4, and the aperture size of the second mounting hole 19 corresponds to that of the reinforcement hole 18; by installing fastening bolts between the first mounting hole 16 and the reference hole 17 and installing fastening bolts between the second mounting hole 19 and the reinforcement hole 18, the left-side load-bearing frame 2, the right-side load-bearing frame 3 and the frame 1 are assembled into a fastening structure.

[0021] The top of the loading part 12 is provided with a plurality of swing arm connection holes 20 arranged in a transverse direction, and there are three swing arm connection holes 20 in total, and the swing arm connection holes 20 are used to fasten the left load frame 2 and the right load frame 3 to the cab suspension swing arm support. The bottom of the loading part 12 and the bending part 4 are respectively provided with a first leaf spring connection hole 22 and a second leaf spring connection hole 23, and the arrangement height and aperture size of the first leaf spring connection hole 22 and the second leaf spring connection hole 23 are the same; the first leaf spring connection hole 22 and the second leaf spring connection hole 23 are used to fix and install the front suspension leaf spring.

[0022] A first steering machine connection hole 21 is provided between the swing arm connection hole 20 and the first mounting hole 16, and a second steering machine connection hole 24 is provided on the middle supporting part 13. Both the second steering machine connection hole 24 and the first steering machine connection hole 21 are deep groove hole structures, so that the second steering machine connection hole 24 and the first steering machine connection hole 21 are convenient for installing long rod bolts, so as to facilitate the fastening and assembly of the steering system steering machine bracket with the left supporting frame 2 and the right supporting frame 3.

[0023] A first lower bracket connection hole 25 is provided at the front side of the second steering machine connection hole 24, and two first lower bracket connection holes 25 are provided; a second lower bracket connection hole 26 is provided at the inner side of the first lower bracket connection hole 25, and a total of four second lower bracket connection holes 26 are provided, and the arrangement height and aperture size of each second lower bracket connection hole 26 are the same as those of the first lower bracket connection hole 25, so that the cab suspension lower bracket is fastened and connected with the left side bearing frame 2, the right side bearing frame 3 and the front traction beam 6. A limited bracket connection hole 27 and a first heat dissipation bracket connection hole 28 are provided at the top of the middle bearing part 13; two limited bracket connection holes 27 are provided, so that the cab suspension limited bracket is fastened and assembled with the left side bearing frame 2 and the right side bearing frame 3. A front traction beam connection hole 29 is provided at the front end of the middle supporting part 13, and there are three front traction beam connection holes 29 in total. A connection hole 30 provided on the front traction beam 6 is provided on the front side of the front traction beam connection hole 29, and there are six connection holes 30 in total. The connection holes 30 correspond to the front traction beam connection holes 29, so that the front traction beam 6 is fixedly assembled at the front ends of the left-side supporting frame 2 and the right-side supporting frame 3.

[0024] The lower connecting portion 14 is provided with a first positioning hole 31, and there are 4 first positioning holes 31 in total. The first positioning hole 31 is provided with a second positioning hole 32 on the positioning bracket 8 on both sides. The inner side of the positioning bracket 8 is provided with an ear plate 33, and the bottom end of the ear plate 33 is fastened to the protective plate 9. The top of the ear plate 33 is provided with a third positioning hole 34. The first positioning hole 31, the second positioning hole 32, and the third positioning hole 34 have the same aperture size, so that the left-side bearing frame 2, the right-side bearing frame 3, the two positioning brackets 8 and the protective plate 9 are fastened and assembled into an integral structure. The rear end of the lower connecting portion 14 is provided with a second heat dissipation bracket connection hole 35, and the second heat dissipation bracket connection hole 35 and the first heat dissipation bracket connection hole 28 are used to fasten the heat dissipation water tank to the left-side bearing frame 2 and the right-side bearing frame 3, so that the heat dissipation water tank is stably arranged between the left-side bearing frame 2 and the right-side bearing frame 3.

[0025] like Figure 1 , 2As shown in 6, the arrangement height of the two ends of the front bending beam 5 is higher than the middle part thereof, and a bending portion 36 is arranged at the outer edge of the front bending beam 5, and the bending portion 36 can be used to disperse the bearing capacity of the front bending beam 5 and prevent stress concentration. The two end sides of the front bending beam 5 are provided with a first bending hole 37, and the two sides of the bending portion 4 are provided with a second bending hole 38, and the second bending holes 38 are arranged on the inner side of the first bending hole 37 and have the same aperture size as the first bending hole 37; the interior of the front bending beam 5 is provided with a groove 39 with an opening facing downward, and the inner side of the bending portion 4 is arranged in the groove 39, so that the bending portion 4 and the front bending beam 5 form an embedded structure, thereby enhancing the stability of the assembly structure. The rear side of the protective plate 9 is a vertical portion, which is arranged inside the groove 39 and is tightly connected to the inner groove surface of the groove 39.

[0026] The front traction beam 6 is designed with a high-strength steel stamping curved beam. Both ends of the front traction beam 6 are provided with traction hook holes 40. There are two traction hook holes 40 and they are symmetrically distributed. The traction hook holes 40 are arranged on the inner side of the connection hole 30. The traction hook holes 40 can be easily connected to the traction hook component of the external trailer, so as to facilitate the towing of heavy commercial vehicles. A ventilation groove 41 is arranged in the middle of the front traction beam 6. The ventilation groove 41 is arranged in front of the heat dissipation water tank, so as to facilitate the heat dissipation capacity of the heat dissipation water tank. A hook pin shaft 7 is arranged inside the ventilation groove 41. The hook pin shaft 7 is arranged vertically. A locking sleeve 42 is fixedly installed on the top of the hook pin shaft 7. The locking sleeve 42 is arranged above the front traction beam 6 and a handle 43 is fixedly installed on the outer wall, so as to facilitate the fixing and locking of the hook pin shaft 7 in the front traction beam 6, so as to facilitate the connection of the external towing rope with the hook pin shaft 7, so as to facilitate the towing of heavy commercial vehicles.

[0027] The two positioning brackets 8 are both of an integrated structure; the positioning bracket 8 is provided with a plurality of strip grooves 44 for lightweight design. The front end of the positioning bracket 8 is provided with a welding portion 45, which can fix and weld the front end of the positioning bracket 8 into a closed structure, thereby enhancing the stability of the overall structure. A C-type frame 10 is arranged below the welding portion 45, and there are two C-type frames 10 in total. The inner groove surfaces of the two C-type frames 10 are fastened to the outer wall of the protective beam 11; a first bolt connection hole 46 is opened on the belly surface of the C-type frame 10, and a second bolt connection hole 47 is opened on the bottom of the positioning bracket 8. The second bolt connection hole 47 is arranged at the same height as the first bolt connection hole 46, and the projection area of ​​the second bolt connection hole 47 is larger than the projection area of ​​the first bolt connection hole 46, so as to facilitate fine-tuning the installation position of the positioning bracket 8 and the C-type frame 10; a plurality of welding filling holes 48 are opened on the upper and lower flange surfaces of the C-type frame 10, and the welding filling holes 48 can be used to fill welding materials to make the connection between the C-type frame 10 and the protective beam 11 more stable.

[0028] The protection beam 11 is an integrated structure, the middle part of the protection beam 11 is a straight structure, and the two ends of the protection beam 11 are symmetrical curved structures with the bending direction facing the frame 1; the interior of the protection beam 11 is provided with a first crumple energy absorbing chamber 49 and a second crumple energy absorbing chamber 50, the first crumple energy absorbing chamber 49 and the second crumple energy absorbing chamber 50 are arranged up and down and isolated from each other, and the contact surfaces between the first crumple energy absorbing chamber 49 and the second crumple energy absorbing chamber 50 are both rounded structures; by providing the first crumple energy absorbing chamber 49 and the second crumple energy absorbing chamber 50, the energy absorption efficiency can be increased to 20%, and the collision intrusion amount can be reduced by 35%.

[0029] Compared with the prior art, the present invention; firstly, the left-side load frame 2 and the right-side load frame 3 in the present invention integrate the steering gear, the suspension leaf spring, and the cab suspension interface, and are fastened to the longitudinal beam of the frame 1 by positioning bolts; secondly, the front traction beam 6 is cast by QT700-10, and is fixedly assembled at the front end of the left-side load frame 2 and the right-side load frame 3 by bolt connection, and is integrated with the hook pin shaft 7 to enhance the functionality and practicality of the vehicle; furthermore, the front bending beam 5 is stamped by high-strength steel, and is bolted to the lower ends of the left-side load frame 2 and the right-side load frame 3 to form a torsion-resistant box structure, thereby forming a split modular design structure, which reduces the weight of the front suspension basic assembly by 25%, increases the strength by 90%, reduces the number of parts by 30%, and reduces the assembly time by 50%, so that it has the characteristics of lightweight, high precision, and high safety, has significant industrial value, and is suitable for the platform development needs of the new generation of intelligent commercial vehicles.

[0030] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A front suspension base assembly for a heavy commercial vehicle, comprising a frame (1), characterized in that: A symmetrically arranged left-side load-bearing frame (2) and a right-side load-bearing frame (3) are fixedly mounted on both sides of the front end of the frame (1); a bent portion (4) is provided on the inner side of the rear end of each of the left-side load-bearing frame (2) and the right-side load-bearing frame (3); the two bent portions (4) are respectively fastened to the two sides of the frame (1); a front bent beam (5) is fixedly mounted between the two bent portions (4); a front traction beam (6) is fastened between the left-side load-bearing frame (2) and the right-side load-bearing frame (3); a hook pin shaft (7) is mounted on the front traction beam (6); and the left The front ends of the side bearing frame (2) and the right bearing frame (3) are both fixedly connected to positioning brackets (8), a protective plate (9) is fastened between the two positioning brackets (8), the protective plate (9) is arranged below the front traction beam (6), the rear side of the protective plate (9) is fastened to the front bending beam (5), a C-shaped frame (10) is fixedly mounted on the front ends of the two positioning brackets (8), the inner groove surfaces of the two C-shaped frames (10) are fastened together to a protective beam (11), and the protective beam (11) is arranged below the protective plate (9).

2. A heavy-duty commercial vehicle front suspension base assembly according to claim 1, characterized in that: The left-side load-bearing frame (2) and the right-side load-bearing frame (3) are both provided with a loading portion (12), a middle supporting portion (13), and a lower connecting portion (14); the middle supporting portion (13) and the lower connecting portion (14) are both provided with a through slot (15); the bent portion (4) is provided on the side of the loading portion (12); a plurality of first mounting holes (16) are provided at the outer edge and the center of the loading portion (12); the frame (1) is a C-beam structure; a plurality of evenly arranged reference holes (17) are provided on the belly surface of the frame (1); the aperture size of the reference holes (17) corresponds to that of the first mounting holes (16); a reinforcement hole (18) is provided on the lower flange surface of the frame (1); a second mounting hole (19) is provided on the bent portion (4); the aperture size of the second mounting hole (19) corresponds to that of the reinforcement hole (18).

3. A heavy-duty commercial vehicle front suspension base assembly according to claim 2, characterized in that: The top of the loading portion (12) is provided with a plurality of swing arm connection holes (20) arranged in a transverse manner, a first steering machine connection hole (21) is provided between the swing arm connection hole (20) and the first mounting hole (16), and the bottoms of the loading portion (12) and the bending portion (4) are respectively provided with a first leaf spring connection hole (22) and a second leaf spring connection hole (23), and the first leaf spring connection hole (22) and the second leaf spring connection hole (23) are arranged at the same height and have the same hole diameter.

4. A heavy-duty commercial vehicle front suspension base assembly according to claim 2, characterized in that: The middle support part (13) is provided with a second steering machine connection hole (24), and the second steering machine connection hole (24) and the first steering machine connection hole (21) are both deep slot hole structures; a first lower bracket connection hole (25) is provided at the front side of the second steering machine connection hole (24), and a second lower bracket connection hole (26) provided at the side of the front traction beam (6) is provided at the inner side of the first lower bracket connection hole (25), and the second lower bracket connection hole (26) and the first lower bracket connection hole (25) have the same arrangement height and hole diameter; a limited bracket connection hole (27) and a first heat dissipation bracket connection hole (28) are provided at the top of the middle support part (13); a front traction beam connection hole (29) is provided at the front end of the middle support part (13), and a connection hole (30) provided on the front traction beam (6) is provided at the front side of the front traction beam connection hole (29), and the connection hole (30) corresponds to the front traction beam connection hole (29).

5. The front suspension base assembly of a heavy-duty commercial vehicle according to claim 2, characterized in that: The lower connecting portion (14) is provided with a first positioning hole (31), and second positioning holes (32) provided on the positioning bracket (8) are provided on both sides of the first positioning hole (31). An ear plate (33) is provided on the inner side of the positioning bracket (8), and the bottom end of the ear plate (33) is fastened to the protective plate (9), and a third positioning hole (34) is provided on the top of the ear plate (33). The first positioning hole (31), the second positioning hole (32), and the third positioning hole (34) have the same aperture size; and a second heat dissipation bracket connection hole (35) is provided at the rear end of the lower connecting portion (14).

6. The heavy-duty commercial vehicle front suspension base assembly according to claim 1, characterized in that: The arrangement height of the two ends of the front bending beam (5) is higher than the middle part thereof; a bending portion (36) is provided at the outer edge of the front bending beam (5); first bending holes (37) are provided at the side portions of both ends of the front bending beam (5); second bending holes (38) are provided on both sides of the bending portion (4); the second bending holes (38) are arranged on the inner side of the first bending hole (37) and have the same aperture size as the first bending hole (37); a groove (39) with an opening facing downward is provided inside the front bending beam (5); the rear side of the protective plate (9) is arranged inside the groove (39) and is tightly connected to the inner groove surface of the groove (39).

7. The heavy-duty commercial vehicle front suspension base assembly according to claim 1, characterized in that: Both ends of the front traction beam (6) are provided with traction hook holes (40), the traction hook holes (40) are arranged inside the connection holes (30), a ventilation slot (41) is arranged in the middle of the front traction beam (6), the hook pin shaft (7) is vertically arranged inside the ventilation slot (41), a locking sleeve (42) is fixedly mounted on the top of the hook pin shaft (7), the locking sleeve (42) is arranged above the front traction beam (6) and a handle (43) is fixedly mounted on the outer wall.

8. The front suspension base assembly of a heavy-duty commercial vehicle according to claim 1, characterized in that: The positioning bracket (8) is an integrated structure, a plurality of strip-shaped grooves (44) are provided on the positioning bracket (8), a welding portion (45) is provided at the front end of the positioning bracket (8), and the welding portion (45) is arranged above the C-shaped frame (10).

9. A heavy-duty commercial vehicle front suspension base assembly according to claim 8, characterized in that: A first bolt connection hole (46) is provided on the ventral surface of the C-shaped frame (10), a second bolt connection hole (47) is provided on the bottom of the positioning bracket (8), the second bolt connection hole (47) and the first bolt connection hole (46) are arranged at the same height, and the projection area of ​​the second bolt connection hole (47) is larger than the projection area of ​​the first bolt connection hole (46); and a plurality of welding filling holes (48) are provided on the upper and lower flange surfaces of the C-shaped frame (10).

10. The heavy-duty commercial vehicle front suspension base assembly according to claim 1, characterized in that: The protection beam (11) is an integrated structure, the middle portion of the protection beam (11) is a straight structure, and the two ends of the protection beam (11) are symmetrical curved structures with the bending direction facing the vehicle frame (1); a first crush energy absorption chamber (49) and a second crush energy absorption chamber (50) are arranged inside the protection beam (11), the first crush energy absorption chamber (49) and the second crush energy absorption chamber (50) are arranged up and down and isolated from each other, and the contact surfaces of the first crush energy absorption chamber (49) and the second crush energy absorption chamber (50) are both rounded structures.

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