Subframe for Front Independent Suspension of Commercial Vehicle

Abstract

The present invention discloses a subframe for a front independent suspension of a commercial vehicle, which includes longitudinal beam assemblies, reinforcing frame assemblies and side cross beam assemblies that are respectively arranged opposite to each other. A middle cross beam assembly is provided between the two side cross beam assemblies. It also includes a bottom frame reinforcement assembly detachably connected to the bottom surfaces of the two side cross beam assemblies. A leaf spring fixing assembly is fixedly connected to the inner end surface of the bottom frame reinforcement assembly, and a leaf spring support plate assembly is fixedly connected to the outer end surface of the bottom frame reinforcement assembly. Weight reduction holes are respectively provided on each assembly. The subframe is disassembled into multiple assemblies for processing, and each assembly is entirely formed by sheet metal bending, cutting and welding, without the need to customize with traditional molds, saving the cost of customizing molds, reducing production costs, and achieving the lightweight design of the subframe by setting weight reduction holes on each assembly while meeting the performance requirements such as stiffness, strength and fatigue resistance of each assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicle parts, and particularly to a subframe for a front independent suspension of a commercial vehicle. Background Art

[0002] The vehicle suspension system plays a huge role in the driving of a vehicle. It is not only responsible for the load transfer and steering transfer of the power system, but also related to key performance indicators such as the handling stability and comfort of the whole vehicle. In commercial vehicles, due to the requirement of load capacity, a non-independent suspension design of a leaf spring and axle assembly that can provide a greater overload capacity is generally used, while the independent suspension design is rarely used in domestic commercial vehicles. However, with the increasing strictness of the load capacity requirements for commercial trucks and the gradual improvement of users' requirements for various performances such as the comfort and handling stability of commercial vehicles, the use of independent suspension systems in commercial vehicles has become a new round of technological competition hotspots among major commercial vehicle manufacturers, especially in the front suspension design of medium and light-duty commercial vehicles. At the same time, with the requirements of the national energy conservation and emission reduction strategy and the medium- and long-term science and technology development plan, the lightweight design of automobiles has been increasingly emphasized. Moreover, the design and application of a front independent suspension in commercial vehicles, compared with the non-independent suspension design using leaf springs, can not only improve the handling stability and comfort of the whole vehicle, but also provide more and more reasonable solutions for the lightweight design of commercial vehicles.

[0003] Although the independent suspension has obvious advantages in handling stability, ride comfort and lightweight design, its structure is complex, and it has high requirements for structural stiffness, strength and fatigue durability performance. Moreover, it is mostly manufactured by casting or forging processes. Compared with the traditional non-independent suspension structure, the cost increases significantly, especially the cost of the subframe accounts for the main part, making it difficult for users to accept the price, which is also one of the important factors that are difficult to promote and apply. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a subframe for a front independent suspension of a commercial vehicle that can reduce the weight of the frame and the production cost on the premise of ensuring that the subframe meets various performance requirements.

[0005] To solve the above technical problems, the technical solution of the present invention is: a subframe for a front independent suspension of a commercial vehicle, which is connected to the upper cross arm and the lower cross arm of the front independent suspension, and includes two longitudinally arranged beam assemblies arranged opposite to each other. A reinforcing frame assembly is fixedly connected respectively and correspondingly directly below the two longitudinally arranged beam assemblies. Side beam assemblies are respectively connected correspondingly to the outer sides of the two reinforcing frame assemblies, and the two side beam assemblies are arranged opposite to each other between the two longitudinally arranged beam assemblies. A middle beam assembly is arranged between the two side beam assemblies. The subframe further includes a bottom frame reinforcing assembly detachably connected to the bottom surfaces of the two side beam assemblies. A leaf spring fixing assembly is fixedly connected to the inner end surface of the bottom frame reinforcing assembly, and both ends of the leaf spring fixing assembly respectively extend to the outer sides of the corresponding reinforcing frame assemblies. The middle beam assembly is detachably installed on the leaf spring fixing assembly. A leaf spring support plate assembly is fixedly connected to the outer end surface of the bottom frame reinforcing assembly. Weight reduction holes are respectively arranged on the longitudinally arranged beam assemblies, the reinforcing frame assemblies, the side beam assemblies, the middle beam assembly, the bottom frame reinforcing assembly, and the leaf spring fixing assembly.

[0006] As a preferred technical solution, the longitudinally arranged beam assembly includes a longitudinally arranged beam body with a U-shaped cross-section at the end face. A longitudinally arranged beam welding notch for welding the reinforcing frame assembly is arranged through the longitudinally arranged beam body. Longitudinally arranged beam reinforcing plates are welded and fixed relatively on the outer side of the longitudinally arranged beam body. Longitudinally arranged beam weight reduction holes are arranged through the longitudinally arranged beam reinforcing plates. An installation support member for installing and supporting the upper cross arm is detachably connected to the top end of the longitudinally arranged beam body. Cross arm connection holes are arranged through the installation support member.

[0007] As a preferred technical solution, the reinforcing frame assembly includes a first reinforcing frame plate and a second reinforcing frame plate, and the top ends of the first reinforcing frame plate and the second reinforcing frame plate are welded together. Side beam installation holes are respectively arranged through the first reinforcing frame plate and the second reinforcing frame plate. Reinforcing frame weight reduction holes are arranged on the first reinforcing frame plate or the second reinforcing frame plate. A third reinforcing frame plate is fixedly welded on the inner surface of the first reinforcing frame plate around the side beam installation hole.

[0008] As a preferred technical solution, the side beam assembly includes a side beam body. A screw hole for connecting the bottom frame reinforcing assembly is arranged through the side beam body. Installation flanges bent upward are respectively arranged on both sides of the side beam body. Flange installation holes are respectively arranged relatively at the end parts of the two installation flanges. A flange support top plate is connected between the installation flanges above the relatively arranged two flange installation holes. A flange support bottom plate is also arranged and connected between the two installation flanges. Each flange support bottom plate is welded to the side beam body and the two installation flanges respectively. Side beam weight reduction holes are respectively arranged through the side beam body and each flange support bottom plate.

[0009] As a preferred technical solution, the middle crossbeam assembly includes a middle crossbeam body bent in a U shape. Horizontal flanges extending outward are respectively provided on both sides of the middle crossbeam body. Reinforcing ribs are arranged and connected between the horizontal flanges and the middle crossbeam body. A middle crossbeam weight reduction hole and a middle crossbeam mounting hole penetrate through the middle crossbeam body. A steering gear bracket is installed at the top end of the middle crossbeam body. The reinforcing ribs are respectively located outside the steering gear bracket.

[0010] As a preferred technical solution, the bottom frame reinforcement assembly includes a bottom frame reinforcement plate with a rectangular structure. Bottom frame mounting parts extending outward are respectively provided at the corners of the bottom frame reinforcement plate. Bottom frame mounting holes are correspondingly provided through the bottom frame mounting parts. A reinforcement plate convex part is provided on the bottom frame reinforcement plate. A leaf spring limiting hole for accommodating the leaf spring fixing assembly penetrates through the reinforcement plate convex part. Mounting limiting flanges for cooperating with the leaf spring fixing assembly are respectively provided on both sides of the end of the bottom frame reinforcement plate where the leaf spring limiting hole is located. And the flanging direction of the mounting limiting flanges is the same as the protruding direction of the reinforcement plate convex part. A bottom frame weight reduction opening also penetrates through the bottom frame reinforcement plate.

[0011] As a preferred technical solution, the leaf spring fixing assembly includes two relatively arranged leaf spring fixing pipe beams. The two leaf spring fixing pipe beams are respectively arranged at the ends of the bottom frame reinforcement plate and are correspondingly arranged between the mounting limiting flanges and the reinforcement plate convex part. A leaf spring body is spanned between the two leaf spring fixing pipe beams. A leaf spring buckle cover is buckled outside the leaf spring body. And the leaf spring buckle cover is detachably installed on the two leaf spring fixing pipe beams. A leaf spring rubber pressing block is provided between the leaf spring buckle cover and the leaf spring body. A buckle cover weight reduction hole penetrates through the leaf spring buckle cover.

[0012] As an improvement to the above technical solution, the leaf spring support plate assembly includes a leaf spring support plate body. Support plate mounting holes are arranged through the leaf spring support plate body. A leaf spring rubber cushion block is detachably installed on the leaf spring support plate body.

[0013] Due to the adoption of the above technical solution, the subframe for the front independent suspension of a commercial vehicle is connected to the upper cross arm and the lower cross arm of the front independent suspension, and includes two longitudinally arranged beam assemblies arranged opposite to each other. Reinforcement frame assemblies are respectively and fixedly connected to the positions directly below the two longitudinally arranged beam assemblies. Side cross beam assemblies are respectively connected to the outer sides of the two reinforcement frame assemblies, and the two side cross beam assemblies are arranged opposite to each other between the two longitudinally arranged beam assemblies. A middle cross beam assembly is arranged between the two side cross beam assemblies. The subframe further includes a bottom frame reinforcement assembly detachably connected to the bottom surfaces of the two side cross beam assemblies. A leaf spring fixing assembly is fixedly connected to the inner end surface of the bottom frame reinforcement assembly, and both ends of the leaf spring fixing assembly respectively extend to the outer sides of the corresponding reinforcement frame assemblies. The middle cross beam assembly is detachably installed on the leaf spring fixing assembly. A leaf spring support plate assembly is fixedly connected to the outer end surface of the bottom frame reinforcement assembly. Weight reduction holes are respectively arranged on the longitudinally arranged beam assemblies, the reinforcement frame assemblies, the side cross beam assemblies, the middle cross beam assemblies, the bottom frame reinforcement assemblies, and the leaf spring fixing assemblies. The present invention has the following beneficial effects: The subframe is disassembled into multiple assemblies for processing, and then installed and combined by welding or screwing. All the assemblies are formed by sheet metal bending, cutting, and welding, without the need for traditional customized molds, saving the cost of customizing molds, reducing production costs, and achieving lightweight design of the subframe by arranging weight reduction holes on each assembly while meeting the stiffness, strength, fatigue resistance, and other performance requirements of each assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them:

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0016] Figure 2 is a schematic structural diagram of the embodiment of the present invention in another direction;

[0017] Figure 3 is a schematic diagram of the disassembled structure of an embodiment of the present invention;

[0018] Figure 4 is a schematic structural diagram of the longitudinally arranged beam assembly of an embodiment of the present invention;

[0019] Figure 5 is a schematic structural diagram of the reinforcement frame assembly of an embodiment of the present invention;

[0020] Figure 6 is a schematic structural diagram of the side cross beam assembly of an embodiment of the present invention;

[0021] Figure 7 is a schematic structural diagram of the middle cross beam assembly of an embodiment of the present invention;

[0022] Figure 8 is a schematic structural view of the bottom frame reinforcement assembly according to an embodiment of the present invention;

[0023] Figure 9 is a schematic structural view of the leaf spring fixing assembly according to an embodiment of the present invention;

[0024] Figure 10 is a schematic structural view of the leaf spring support plate assembly according to an embodiment of the present invention;

[0025] In the figure: 1 - longitudinal beam assembly; 11 - longitudinal beam body; 12 - longitudinal beam welding notch; 13 - longitudinal beam reinforcement plate; 14 - longitudinal beam weight reduction hole; 15 - installation support member; 16 - cross arm connection hole; 2 - reinforcement frame assembly; 21 - first reinforcement frame plate; 22 - second reinforcement frame plate; 23 - side cross beam installation hole; 24 - reinforcement frame weight reduction hole; 25 - third reinforcement frame plate; 3 - side cross beam assembly; 31 - side cross beam body; 32 - installation flange; 33 - flange installation hole; 34 - flange support top plate; 35 - installation avoidance opening; 36 - flange support bottom plate; 37 - side cross beam weight reduction hole; 4 - middle cross beam assembly; 41 - middle cross beam body; 42 - horizontal flange; 43 - reinforcement rib; 44 - middle cross beam weight reduction hole; 45 - middle cross beam installation hole; 46 - steering gear bracket; 5 - bottom frame reinforcement assembly; 51 - bottom frame reinforcement plate; 52 - bottom frame installation part; 53 - bottom frame installation hole; 54 - reinforcement plate convex part; 55 - leaf spring limit hole; 56 - installation limit flange; 57 - bottom frame weight reduction opening; 6 - leaf spring fixing assembly; 61 - leaf spring fixing pipe beam; 62 - leaf spring body; 63 - leaf spring buckle cover; 64 - leaf spring rubber pressing block; 65 - buckle cover weight reduction hole; 7 - leaf spring support plate assembly; 71 - leaf spring support plate body; 72 - support plate installation hole; 73 - leaf spring rubber cushion block; 8 - upper cross arm; 9 - lower cross arm; 10 - limiter bracket. Detailed implementation manners

[0026] The present invention will be further described below in conjunction with the drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present invention are described by way of illustration. It is needless to say that those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not used to limit the protection scope of the claims.

[0027] As Figure 1 , Figure 2 and Figure 3As shown in the figure, the subframe for the front independent suspension of a commercial vehicle is connected to the two upper cross arms 8 and the two lower cross arms 9 of the front independent suspension of the commercial vehicle on both sides respectively. It includes two longitudinally arranged beam assemblies 1 which are detachably connected to the two upper cross arms 8 respectively. And a limiter bracket 10 on the front independent suspension of the commercial vehicle is also installed on the longitudinally arranged beam assembly 1, which mainly realizes the connection with the longitudinal beam of the vehicle frame of the commercial vehicle and completes the installation and fixation of the entire subframe. Below the two longitudinally arranged beam assemblies 1, there are respectively fixedly connected with strengthening frame assemblies 2 which are symmetrically arranged left and right on the longitudinally arranged beam assembly 1 and play an intermediate connection role to enhance the bending and torsional rigidity strength.

[0028] On the outer sides of the two strengthening frame assemblies 2, there are respectively connected with side cross beam assemblies 3 which are oppositely arranged between the two longitudinally arranged beam assemblies 1. That is, through the cooperation of the strengthening frame assemblies 2 and the two side cross beam assemblies 3, the connection of the two longitudinally arranged beam assemblies 1 is realized. There is a middle cross beam assembly 4 between the two side cross beam assemblies 3 for installing the steering gear of the commercial vehicle.

[0029] This embodiment also includes a bottom frame strengthening assembly 5 detachably connected to the bottom surfaces of the two side cross beam assemblies 3. Through the bottom frame strengthening assembly 5, the two side cross beam assemblies 3 can be connected to improve the torsional rigidity strength of the overall structure of the subframe. On the inner end surface of the bottom frame strengthening assembly 5, there is fixedly connected with a leaf spring fixing assembly 6, and both ends of the leaf spring fixing assembly 6 respectively extend to the outside of the corresponding strengthening frame assembly 2. The middle cross beam assembly 4 is detachably installed on the leaf spring fixing assembly 6. The leaf spring fixing assembly 6 is the leaf spring assembly for shock absorption and strengthening support. On the outer end surface of the bottom frame strengthening assembly 5, there is fixedly connected with a leaf spring support plate assembly 7 to strengthen the support for the leaf spring fixing assembly 6 and improve the stability of the leaf spring fixing assembly 6.

[0030] The longitudinally arranged beam assembly 1, the strengthening frame assembly 2, the side cross beam assembly 3, the middle cross beam assembly 4, the bottom frame strengthening assembly 5, and the leaf spring fixing assembly 6 are respectively provided with weight reduction holes. And each assembly of this embodiment is made by sheet metal cutting, bending and welding processes. Most of the structures are cut and bored to minimize the overall weight of each assembly, so that each assembly cooperates with each other to realize the lightweight design of the subframe.

[0031] Such as Figure 4As shown, the longitudinal beam assembly 1 includes a longitudinal beam body 11 with a U-shaped end face structure. A longitudinal beam welding notch 12 for welding the reinforcing frame assembly 2 penetrates through the longitudinal beam body 11, that is, the reinforcing frame assembly 2 is arranged in the corresponding longitudinal beam welding notch 12. Longitudinal beam reinforcing plates 13 are welded and fixed relatively on the outer side of the longitudinal beam body 11. Longitudinal beam weight-reducing holes 14 are arranged through the longitudinal beam reinforcing plates 13. The top end of the longitudinal beam body 11 is detachably connected with a mounting support member 15 for mounting and supporting the upper cross arm 8. A cross arm connection hole 16 is arranged through the mounting support member 15. The upper cross arm 8 is detachably mounted on the mounting support member 15 through the cross arm connection hole 16 with the cooperation of connection bolts.

[0032] As Figure 5 shown, the reinforcing frame assembly 2 includes a first reinforcing frame plate 21 and a second reinforcing frame plate 22. The top ends of the first reinforcing frame plate 21 and the second reinforcing frame plate 22 are butt-welded, and at the same time, the top ends of the first reinforcing frame plate 21 and the second reinforcing frame plate 22 are also welded to the inner wall of the longitudinal beam welding notch 12. Side cross beam mounting holes 23 are respectively arranged through the first reinforcing frame plate 21 and the second reinforcing frame plate 22. A reinforcing frame weight-reducing hole 24 is arranged on the first reinforcing frame plate 21 or the second reinforcing frame plate 22. A third reinforcing frame plate 25 is fixedly welded on the inner surface of the first reinforcing frame plate 21 around the side cross beam mounting hole 23. The lower cross arm 9 is mounted on the side cross beam assembly 3, but one end is arranged in the side cross beam mounting hole 23. The third reinforcing frame plate 25 can improve the strength at the mounting position of the lower cross arm 9.

[0033] As Figure 6 shown, the side cross beam assembly 3 includes a side cross beam body 31. A screw hole for connecting the bottom frame reinforcing assembly 5 penetrates through the side cross beam body 31. Mounting flanges 32 bent upward are respectively arranged on both sides of the side cross beam body 31. Flange mounting holes 33 are respectively arranged relatively at the end parts through the two mounting flanges. The other end of the lower cross arm 9 is mounted in the flange mounting hole 33. A flange support top plate 34 is connected between the mounting flanges 32 arranged relatively above the two flange mounting holes 33. An installation avoidance opening 35 is arranged on one side of the flange support top plate 34 facing the lower cross arm 9 to realize the smooth installation of the lower cross arm 9. A flange support bottom plate 36 is also arranged and connected between the two mounting flanges 32 to improve the overall strength of the assembly. Each flange support bottom plate 36 is respectively welded to the side cross beam body 31 and the two mounting flanges 32. Side cross beam weight-reducing holes 37 are respectively arranged through the side cross beam body 31 and each flange support bottom plate 36.

[0034] As Figure 7As shown, the middle crossbeam assembly 4 includes a middle crossbeam body 41 bent into a U shape. On both sides of the middle crossbeam body 41, there are horizontally extending flanges 42 respectively. Between the horizontal flanges 42 and the middle crossbeam body 41, there are reinforcing ribs 43 arranged and connected. The middle crossbeam body 41 is provided with a middle crossbeam weight reduction hole 44 and a middle crossbeam mounting hole 45. Through the cooperation of the middle crossbeam mounting hole 45 and the connecting bolt, the connection between it and the leaf spring fixing assembly 6 is realized. At the top of the middle crossbeam body 41, a steering gear bracket 46 is installed. The reinforcing ribs 43 are respectively located outside the steering gear bracket 46. The steering gear of the commercial vehicle is arranged on the steering gear bracket 46. The middle crossbeam assembly 4 is formed by cutting and bending a whole sheet metal. The reinforcing ribs 43 are mainly used to increase its strength.

[0035] As Figure 8 shown, the bottom frame strengthening assembly 5 is also formed by cutting and bending a whole sheet metal. It includes a bottom frame strengthening plate 51 with a rectangular structure. At the corners of the bottom frame strengthening plate 51, there are bottom frame mounting parts 52 extending outwards respectively. Corresponding to the bottom frame mounting parts 52, there are bottom frame mounting holes 53. Through the cooperation of the bottom frame mounting holes 53 and the connecting bolts, the connection and fixation of this assembly with the leaf spring fixing assembly 6 are realized. On the bottom frame strengthening plate 51, there is a strengthening plate protrusion 54. Through the strengthening plate protrusion 54, there is a leaf spring limiting hole 55 for accommodating the leaf spring fixing assembly 6. At both sides of the end of the bottom frame strengthening plate 51 where the leaf spring limiting hole 55 is located, there are mounting limiting flanges 56 that cooperate with the leaf spring fixing assembly 6. And the flanging direction of the mounting limiting flanges 56 is the same as the protruding direction of the strengthening plate protrusion 54. Through the bottom frame strengthening plate 51, there is also a bottom frame weight reduction opening 57.

[0036] As Figure 9 shown, the leaf spring fixing assembly 6 includes two leaf spring fixing pipe beams 61 arranged oppositely. The two leaf spring fixing pipe beams 61 are respectively arranged at the ends of the bottom frame strengthening plate 51 and are correspondingly arranged between the mounting limiting flanges 56 and the strengthening plate protrusion 54, and are welded to the bottom frame strengthening plate 51. A leaf spring body 62 is spanned between the two leaf spring fixing pipe beams 61. The leaf spring body 62 passes through the leaf spring limiting hole 55. A leaf spring buckle cover 63 is buckled outside the leaf spring body 62, and the leaf spring buckle cover 63 is detachably installed on the two leaf spring fixing pipe beams 61. Between the leaf spring buckle cover 63 and the leaf spring body 62, there is a leaf spring rubber pressing block 64. Through the leaf spring buckle cover 63, there is a buckle cover weight reduction hole 65. The leaf spring limiting hole 55 limits the leaf spring body 62 in the horizontal direction left and right, and the leaf spring rubber pressing block 64 limits the leaf spring body 62 in the vertical direction up and down. The two cooperate to improve the installation stability of the leaf spring body 62.

[0037] AsFigure 10 As shown, the leaf spring carrier assembly 7 includes a leaf spring carrier body 71, through which a carrier mounting hole 72 is arranged. A leaf spring rubber cushion block 73 is detachably mounted on the leaf spring carrier body 71, and the leaf spring rubber cushion block 73 is mounted on the leaf spring carrier body 71 by bolts. The connection between this assembly and the bottom frame reinforcement assembly 5 is achieved through the cooperation of the carrier mounting hole 72 and the leaf spring carrier body 71.

[0038] In the present invention, the subframe is disassembled into multiple assemblies for processing, and then installed and combined by welding or screwing. Moreover, all the assemblies are formed by sheet metal bending, cutting and welding, without the need to customize traditional molds, saving the cost of customizing molds, reducing the production cost, and realizing the lightweight design of the subframe by setting weight reduction holes on each assembly while meeting the performance requirements such as stiffness, strength and fatigue resistance of each assembly.

[0039] The description of the present invention is given for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention so as to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A subframe for a front independent suspension of a commercial vehicle, which is connected to the upper cross arm and the lower cross arm of the front independent suspension. It is characterized in that: It includes two longitudinally beam assemblies arranged oppositely. A stopper bracket on the front independent suspension of the commercial vehicle is also installed on the longitudinally beam assemblies. Reinforcing frame assemblies are respectively fixedly connected corresponding to the lower sides of the two longitudinally beam assemblies. The reinforcing frame assemblies are symmetrically arranged left and right on the longitudinally beam assemblies. Side cross beam assemblies are respectively connected corresponding to the outsides of the two reinforcing frame assemblies. And the two side cross beam assemblies are arranged oppositely between the two longitudinally beam assemblies. A middle cross beam assembly is arranged between the two side cross beam assemblies. It also includes a bottom frame reinforcing assembly detachably connected to the bottom surfaces of the two side cross beam assemblies. A leaf spring fixing assembly is fixedly connected to the inner end surface of the bottom frame reinforcing assembly. And both ends of the leaf spring fixing assembly respectively extend to the outsides of the corresponding reinforcing frame assemblies. The middle cross beam assembly is detachably installed on the leaf spring fixing assembly. A leaf spring support plate assembly is fixedly connected to the outer end surface of the bottom frame reinforcing assembly. Weight reduction holes are respectively arranged on the longitudinally beam assemblies, the reinforcing frame assemblies, the side cross beam assemblies, the middle cross beam assemblies, the bottom frame reinforcing assemblies, and the leaf spring fixing assemblies. The longitudinally beam assembly includes a longitudinally beam body with a U-shaped cross-section at the end face. A longitudinally beam welding notch for welding the reinforcing frame assembly is provided through the longitudinally beam body. Longitudinally beam reinforcing plates are relatively welded and fixed to the outside of the longitudinally beam body. Longitudinally beam weight reduction holes are arranged through the longitudinally beam reinforcing plates. The top end of the longitudinally beam body is detachably connected with a mounting support for mounting and supporting the upper cross arm. Cross arm connection holes are arranged through the mounting support.

2. The subframe for a front independent suspension of a commercial vehicle according to claim 1. It is characterized in that: The reinforcing frame assembly includes a first reinforcing frame plate and a second reinforcing frame plate. And the top ends of the first reinforcing frame plate and the second reinforcing frame plate are welded together. Side cross beam mounting holes are respectively provided through the first reinforcing frame plate and the second reinforcing frame plate. Reinforcing frame weight reduction holes are provided on the first reinforcing frame plate or the second reinforcing frame plate. A third reinforcing frame plate is fixedly welded on the inner surface of the first reinforcing frame plate around the side cross beam mounting hole.

3. The subframe for a front independent suspension of a commercial vehicle according to claim 1. It is characterized in that: The side cross beam assembly includes a side cross beam body. A screw hole for connecting the bottom frame reinforcing assembly is provided through the side cross beam body. Mounting flanges bent upward are respectively provided on both sides of the side cross beam body. Flange mounting holes are respectively provided oppositely at the end parts of the two mounting flanges. A flange support top plate is connected between the mounting flanges above the relatively arranged two flange mounting holes. A flange support bottom plate is also arranged and connected between the two mounting flanges. Each flange support bottom plate is welded to the side cross beam body and the two mounting flanges respectively. Side cross beam weight reduction holes are respectively provided through the side cross beam body and each flange support bottom plate.

4. The subframe for the front independent suspension of a commercial vehicle as claimed in claim 1, characterized in that: the middle crossbeam assembly includes a middle crossbeam body bent in a U shape, horizontal flanges extending outward are respectively arranged on both sides of the middle crossbeam body, reinforcing ribs are arranged and connected between the horizontal flanges and the middle crossbeam body, a middle crossbeam weight reduction hole and a middle crossbeam mounting hole are provided through the middle crossbeam body, a steering gear bracket is mounted at the top end of the middle crossbeam body, and the reinforcing ribs are respectively located outside the steering gear bracket.

5. The subframe for the front independent suspension of a commercial vehicle as claimed in claim 1, characterized in that: the bottom frame reinforcement assembly includes a bottom frame reinforcement plate with a rectangular structure, bottom frame mounting parts extending outward are respectively arranged at the corners of the bottom frame reinforcement plate, bottom frame mounting holes are correspondingly provided through the bottom frame mounting parts, a reinforcement plate protrusion is provided on the bottom frame reinforcement plate, a leaf spring limiting hole for accommodating the leaf spring fixing assembly is provided through the reinforcement plate protrusion, mounting limiting flanges for cooperating with the leaf spring fixing assembly are respectively arranged on both sides of the end of the bottom frame reinforcement plate where the leaf spring limiting hole is located, and the flanging direction of the mounting limiting flanges is the same as the protruding direction of the reinforcement plate protrusion, and a bottom frame weight reduction opening is also provided through the bottom frame reinforcement plate.

6. The subframe for the front independent suspension of a commercial vehicle as claimed in claim 5, characterized in that: the leaf spring fixing assembly includes two relatively arranged leaf spring fixing pipe beams, the two leaf spring fixing pipe beams are respectively arranged at the ends of the bottom frame reinforcement plate and correspondingly arranged between the mounting limiting flanges and the reinforcement plate protrusion, a leaf spring body is spanned between the two leaf spring fixing pipe beams, a leaf spring buckle cover is covered outside the leaf spring body, and the leaf spring buckle cover is detachably mounted on the two leaf spring fixing pipe beams, a leaf spring rubber pressing block is arranged between the leaf spring buckle cover and the leaf spring body, and a buckle cover weight reduction hole is provided through the leaf spring buckle cover.

7. The subframe for the front independent suspension of a commercial vehicle as claimed in claim 6, characterized in that: the leaf spring support plate assembly includes a leaf spring support plate body, support plate mounting holes are arranged through the leaf spring support plate body, and a leaf spring rubber cushion block is detachably mounted on the leaf spring support plate body.

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