Suspension beam assembly and design matching method thereof

Abstract

The invention relates to the technical field of automobile suspension cross beam assemblies, and provides a suspension cross beam assembly and a design matching method.The suspension cross beam assembly comprises at least two cross beams, a first connecting support, a second connecting support and a plurality of first connecting pieces, the cross beams are arranged in a sheet shape, and the at least two cross beams are arranged side by side in the first direction; a first connecting hole and a second connecting hole are respectively formed in two ends of the cross beam along the first direction; the first connecting support is arranged at one end, in the first direction, of the cross beam, the second connecting support is arranged at the other end, in the first direction, of the cross beam, a plurality of first fixing holes are formed in the first connecting support, and a plurality of second fixing holes are formed in the second connecting support; the first connecting pieces are arranged between the first connecting holes and the first fixing holes and between the second connecting holes and the second fixing holes in a penetrating mode so that the first connecting supports and the second connecting supports can be fixedly connected to the two ends of the cross beam respectively. The suspension cross beam assembly structure is easy to maintain, simple and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive suspension crossbeam assemblies, and particularly to a suspension crossbeam assembly and a design and matching method thereof. Background Art

[0002] The main function of the leaf spring bracket of a heavy-duty dump truck is to fix the leaf spring and at the same time transmit the acting force from the leaf spring to the frame assembly. It bears large and complex loads. Especially for the leaf spring combined bracket in a double front axle suspension system, it simultaneously bears the acting forces from the leaf springs of the first axle and the second axle. To improve the stress state of the leaf spring bracket and enhance the durability of the leaf spring combined bracket, generally, the left and right leaf spring brackets are connected together through a suspension crossbeam.

[0003] Currently, the suspension crossbeam assembly is composed of a bottom plate, a stamping beam, a connecting plate, and a supporting plate, which are welded together. The structure is complex, the cost is high, and fracture failures occur during actual use, seriously affecting the attendance rate of the whole vehicle. At the same time, it poses an unpredictable risk to the whole vehicle during driving. After analysis, the reason for the above failure is that the current suspension crossbeam assembly, its structure and stiffness are not suitable for the operation scenario of the composite torsion working condition of the dump truck. Summary of the Invention

[0004] The present invention provides a suspension crossbeam assembly and a design and matching method thereof to solve the defect that the suspension crossbeam assembly in the prior art has fracture failures during actual use, seriously affecting the attendance rate of the whole vehicle and at the same time posing an unpredictable risk to the whole vehicle during driving. The suspension crossbeam assembly of the present application is easy to maintain, and is simple and reliable.

[0005] The present invention provides a suspension crossbeam assembly, including: At least two crossbeams, the crossbeams are arranged in a sheet shape, at least two of the crossbeams are arranged side by side in a first direction, and first connection holes and second connection holes are respectively provided at both ends of the crossbeams in the first direction; A first connection bracket and a second connection bracket, the first connection bracket is provided at one end of the crossbeam in the first direction, the second connection bracket is provided at the other end of the crossbeam in the first direction, a plurality of first fixing holes are opened in the first connection bracket, and a plurality of second fixing holes are opened in the second connection bracket; A plurality of first connecting members, the plurality of first connecting members respectively pass through between the first connection holes and the first fixing holes and between the second connection holes and the second fixing holes to respectively fixedly connect the first connection bracket and the second connection bracket to both ends of the crossbeam; A suspension crossbeam assembly provided by the present invention, wherein the first connecting bracket or the second connecting bracket both includes a base and two connecting arms. The two connecting arms are respectively arranged on both sides of the base and are bent toward the side of the crossbeam. A plurality of the first fixing holes or a plurality of the second fixing holes are symmetrically arranged in pairs on the two connecting arms.

[0006] A suspension crossbeam assembly provided by the present invention, wherein a plurality of mounting holes are formed in the base. The base is connected to the left leaf spring combination bracket or the right leaf spring combination bracket by passing a second connecting member through the mounting holes.

[0007] A suspension crossbeam assembly provided by the present invention, wherein an assembly process round hole is formed in the middle of the base.

[0008] A suspension crossbeam assembly provided by the present invention, wherein the crossbeam is arranged in a shape of a gold ingot with both ends high and the middle low.

[0009] A suspension crossbeam assembly provided by the present invention, wherein the first connecting hole and the second connecting hole are oval holes. Among them, the major axis of the oval hole extends along the first direction.

[0010] A suspension crossbeam assembly provided by the present invention, wherein the first connecting bracket and the second connecting bracket are made of a metal material with a fracture elongation rate greater than 15%.

[0011] A suspension crossbeam assembly provided by the present invention, wherein the thickness of the first connecting bracket and the second connecting bracket is 1.5 times the thickness of the crossbeam.

[0012] The present invention also provides a design matching method for a suspension crossbeam assembly, which is applied to the above suspension crossbeam assembly. The torsional ratio stress of the front crossbeam is , the torsional ratio stress of the suspension crossbeam assembly is , and the torsional ratio stress of the three crossbeams of the vehicle frame is ; then the torsional ratio stresses among the front crossbeam, the suspension crossbeam assembly and the three crossbeams of the vehicle frame are < < ; The bending ratio stress of the front crossbeam is , the bending ratio stress of the suspension crossbeam assembly is , and the bending ratio stress of the three crossbeams of the vehicle frame is ; then the bending ratio stresses among the front crossbeam, the suspension crossbeam assembly and the three crossbeams of the vehicle frame are < < .

[0013] A design and matching method for a suspension crossbeam assembly provided by the present invention, the torsional ratio stress of the crossbeam is defined as ; the bending ratio stress of the crossbeam is defined as ; In the formula: is the end torque of the frame crossbeam; is the torsional section modulus of the frame crossbeam; is the torsional angle under the action of the end torque T of the frame crossbeam; is the bending moment of the frame crossbeam; is the bending section modulus of the frame crossbeam; is the end load of the frame crossbeam; is the width of the frame crossbeam; is the displacement under the action of the end load F of the frame.

[0014] The suspension crossbeam assembly and its design and matching method provided by the present invention assemble two crossbeams at both ends with connecting parts to the first connecting bracket and the second connecting bracket to form the suspension crossbeam assembly. Since this suspension crossbeam assembly is assembled in the form of connecting parts, it avoids complex welding processes. Moreover, for the suspension crossbeam assembly of the present invention, its overall structure is a sheet-shaped crossbeam, which appropriately releases the torsional stiffness of the C-shaped structure, is more conducive to the torsional deformation of the frame assembly, reduces the maximum stress of the suspension crossbeam assembly from 418 MPa to 209 MPa, greatly improves the stress distribution of the suspension crossbeam assembly, and at the same time, the structure of the suspension crossbeam assembly of the present invention is simple, highly reliable, and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is the layout diagram of the front suspension assembly provided by the present invention.

[0017] Figure 2 is the structural schematic diagram of the suspension crossbeam assembly provided by the present invention.

[0018] Figure 3 is Figure 2 the structural schematic diagram of the first connecting bracket or the second connecting bracket in

[0019] Figure 4 is Figure 2 the structural schematic diagram of the crossbeam in

[0020] Figure 5It is the frame assembly provided by the present invention.

[0021] Figure 6 It is a schematic diagram of the torsional deformation of the frame assembly provided by the present invention.

[0022] Figure 7 It is a cloud map of the frame stress distribution provided by the present invention, where a is after improvement and b is before improvement.

[0023] Reference numerals: 1. Left leaf spring combined bracket; 2. Right leaf spring combined bracket; 3. Suspension crossbeam assembly; 31. First connection bracket; 32. Second connection bracket; 33. Base; 331. Mounting hole; 332. Assembly process round hole; 34. Connecting arm; 341. First fixing hole; 342. Second fixing hole; 35. Crossbeam; 351. First connection hole; 352. Second connection hole; 353. Weight reduction hole; 36. First connecting piece; 4. Front crossbeam; 5. Frame three crossbeams. Detailed implementation manners

[0024] The following further describes the implementation manners of the present invention in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0027] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0029] The following combines Figures 1 to 7 , and through specific embodiments and their application scenarios, the suspension crossbeam assembly and its design and matching method provided by the embodiments of the present invention are described in detail.

[0030] In the embodiments of the present invention, as Figures 1 to 4 shown, the suspension crossbeam assembly 3 includes at least two crossbeams 35, a first connection bracket 31, a second connection bracket 32 and a plurality of first connectors 36. The crossbeams 35 are arranged in a sheet shape, and at least two crossbeams 35 are arranged side by side in a first direction. Both ends of the crossbeam 35 in the first direction are respectively provided with a first connection hole 351 and a second connection hole 352; the first connection bracket 31 is arranged at one end of the crossbeam 35 in the first direction, the second connection bracket 32 is arranged at the other end of the crossbeam 35 in the first direction, the first connection bracket 31 is provided with a plurality of first fixing holes 341, and the second connection bracket 32 is provided with a plurality of second fixing holes 342; a plurality of first connectors 36 are respectively passed between the first connection hole 351 and the first fixing hole 341 and between the second connection hole 352 and the second fixing hole 342 to respectively fixedly connect the first connection bracket 31 and the second connection bracket 32 to both ends of the crossbeam 35.

[0031] The crossbeam 35 is the main load-bearing component of the suspension crossbeam assembly 3. At least two crossbeams 35 are arranged side by side in the first direction, which not only enhances the overall strength and stiffness of the structure, but also can better disperse and bear the load from the vehicle frame. The arrangement of multiple crossbeams 35 enables the assembly to better adapt to complex stress environments and improves the stability and durability of the suspension system.

[0032] Compared with the traditional C-shaped or box-shaped structures, the sheet-shaped crossbeam 35 design has a lighter weight and better flexibility. It helps to release the torsional stiffness of the suspension system, enabling the vehicle frame assembly to deform better when subjected to torsional loads, thereby improving the driving stability and riding comfort of the vehicle. In addition, the sheet-shaped crossbeam 35 is also easier to process and manufacture, reducing the production cost.

[0033] At both ends of the crossbeam 35 in the first direction, a first connection hole 351 and a second connection hole 352 are respectively provided. The connection holes are provided for fixed connection with connection brackets and connecting parts. The first connection hole 351 and the second connection hole 352 are respectively located at both ends of the crossbeam 35, ensuring that the connection bracket can be firmly fixed on the crossbeam 35. This makes the structure of the suspension crossbeam assembly 3 more compact and stable, and can bear greater loads and impact forces.

[0034] The first connection bracket 31 and the second connection bracket 32. The connection brackets are the connecting components between the suspension crossbeam assembly 3 and the vehicle frame assembly. The first connection bracket 31 and the second connection bracket 32 are respectively provided at both ends of the crossbeam 35, playing a role in supporting and fixing the crossbeam 35. Multiple fixing holes are provided on the connection brackets for cooperation with the connecting parts to achieve a firm connection with the crossbeam 35. This design enhances the connection strength between the suspension crossbeam assembly 3 and the vehicle frame assembly and improves the stability and safety of the whole vehicle.

[0035] Multiple first fixing holes 341 and second fixing holes 342 are respectively provided on the first connection bracket 31 and the second connection bracket 32. The fixing holes are provided for cooperation with the connecting parts to achieve the fixed connection between the connection bracket and the crossbeam 35. The design of multiple fixing holes makes the connection more flexible and reliable, and can adapt to different installation requirements and stress environments. At the same time, the fixing holes also play a positioning role to ensure that the connection bracket can be accurately installed on the crossbeam 35.

[0036] A plurality of first connecting members 36 are respectively disposed between the first connection holes 351 and the first fixing holes 341, and between the second connection holes 352 and the second fixing holes 342. The connecting members are key components in the suspension crossbeam assembly 3 that connect the crossbeam 35 and the connection bracket. A plurality of connecting members are respectively disposed between the connection holes and the fixing holes, and the connection bracket is firmly fixed to the crossbeam 35 through a fastening action. This connection method is not only simple and reliable, but also easy to disassemble and replace, reducing the maintenance cost. At the same time, the connecting members also play a role in transmitting loads and dispersing stresses, improving the overall load-bearing capacity and durability of the suspension crossbeam assembly 3.

[0037] In this application, the two ends of the two crossbeams 35 are assembled with the first connection bracket 31 and the second connection bracket 32 through connecting members to form the suspension crossbeam assembly 3. Since the suspension crossbeam assembly 3 is assembled in the form of connecting members, complex welding processes are avoided. And for the suspension crossbeam assembly 3 of the present invention, its overall structure is a sheet-shaped crossbeam 35, which appropriately releases the torsional stiffness of the C-shaped structure, is more conducive to the torsional deformation of the frame assembly, so that the maximum stress of the suspension crossbeam assembly 3 drops from 418 MPa to 209 MPa, and the stress distribution of the suspension crossbeam assembly 3 is greatly improved. At the same time, the structure of the suspension crossbeam assembly 3 of the present invention is simple, highly reliable, and easy to maintain.

[0038] Referring to Figure 2 and Figure 3 , according to a suspension crossbeam assembly 3 provided by the present invention, the first connection bracket 31 or the second connection bracket 32 both includes a base 33 and two connecting arms 34. The two connecting arms 34 are respectively disposed on both sides of the base 33 and are bent toward the side facing the crossbeam 35. A plurality of first fixing holes 341 or a plurality of second fixing holes 342 are symmetrically disposed in pairs on the two connecting arms 34.

[0039] It can be understood that the first connection bracket 31 or the second connection bracket 32 includes a base 33 and two connecting arms 34, which increases the stability and strength of the connection bracket. The base 33 provides a solid foundation, and the connecting arms 34 are used to connect the crossbeam 35 to form a stable support structure. The design of the base 33 and the connecting arms 34 enables the connection bracket to better withstand the forces and torques from the crossbeam 35.

[0040] The two connecting arms 34 are respectively disposed on both sides of the base 33 and are bent toward the side facing the crossbeam 35. The bent design of the connecting arms 34 helps to better adapt to the shape and position of the crossbeam 35, and at the same time provides a uniform force distribution, reducing local stress concentration. The bent design enables the connecting arms 34 to closely fit the crossbeam 35, improving the stability of the connection.

[0041] A plurality of first fixing holes 341 or a plurality of second fixing holes 342 are symmetrically arranged in pairs on the two connecting arms 34. The symmetrically distributed fixing holes ensure the uniform distribution of the connecting members, thereby providing uniform force transmission and better load dispersion. The symmetric design helps to balance the forces at both ends of the crossbeam 35 and reduce distortion or deformation caused by improper assembly. Refer to Figure 3 According to a suspension crossbeam assembly 3 provided by the present invention, a plurality of mounting holes 331 are formed in the base 33. The base 33 is connected to the left leaf spring combination bracket 1 or the right leaf spring combination bracket 2 by a second connecting member passing through the mounting holes 331.

[0042] It can be understood that the mounting holes 331 are formed in the base 33, and their positions and numbers are determined according to the specific design and installation requirements of the suspension crossbeam assembly 3. Usually, these holes are evenly distributed on the base 33 to ensure the uniform distribution of the connecting members, thereby providing a stable connection. The shapes and sizes of the mounting holes 331 match the second connecting members used to ensure that the connecting members can pass through the holes smoothly and be firmly connected to the leaf spring combination bracket. Common shapes include circular, oval or square, etc., and the sizes are determined according to the specifications of the connecting members.

[0043] The second connecting member (such as bolts, nuts, rivets, etc.) passes through the mounting holes 331 to connect the suspension crossbeam assembly 3 with the left leaf spring combination bracket 1 or the right leaf spring combination bracket 2. This connection method is not only simple and reliable, but also easy to disassemble and replace, facilitating maintenance and repair. The second connecting member also plays a role in transmitting loads. When the vehicle is running, the suspension crossbeam assembly 3 is subjected to various forces and vibrations from the road surface. These forces and vibrations are transmitted to the leaf spring combination bracket through the second connecting member, and then dispersed to other parts of the vehicle frame to ensure the stability and safety of the vehicle.

[0044] Refer to Figure 3 According to a suspension crossbeam assembly 3 provided by the present invention, an assembly process round hole 332 is formed in the middle of the base 33.

[0045] It can be understood that the design of the assembly process round hole 332 is mainly used to facilitate the disassembly and assembly of key components (such as leaf spring pins) in the leaf spring combination bracket, thereby simplifying the entire assembly and maintenance process. The assembly process round hole 332 provides additional operating space for the operator, making it more convenient to install or disassemble the leaf spring combination bracket. For example, when installing the leaf spring pin, it is easier to align and insert the pin through the round hole, reducing the assembly difficulty.

[0046] Refer to Figure 2 and Figure 4 According to a suspension crossbeam assembly 3 provided by the present invention, the crossbeam 35 is arranged in a shape like a yuanbao with higher ends and lower middle.

[0047] It can be understood that the ingot-shaped design makes the middle part of the crossbeam 35 lower, which can reserve sufficient space for the middle position of the vehicle frame, facilitating the arrangement of key components such as the gearbox and the drive shaft. This design is particularly suitable for vehicles such as heavy dump trucks that require complex chassis layouts. By reasonably utilizing the chassis space, the ingot-shaped crossbeam 35 can achieve the best functional layout within a limited space, avoid interference with other components, and improve the overall design efficiency of the whole vehicle.

[0048] The ingot-shaped design effectively disperses the acting forces from the leaf spring and other loads by changing the cross-sectional shape of the crossbeam 35, reducing the phenomenon of local stress concentration. Especially under complex working conditions, reasonable stress distribution can significantly extend the service life of the crossbeam 35. By optimizing the stress distribution, the ingot-shaped crossbeam 35 can reduce the risk of material fatigue, improve the durability and reliability of the overall structure, and reduce the fracture failure caused by stress concentration.

[0049] Refer to Figure 4 , according to a suspension crossbeam assembly 3 provided by the present invention, the first connection hole 351 and the second connection hole 352 are oval holes, wherein the long axis of the oval hole extends along the first direction.

[0050] It can be understood that a plurality of circular weight-reducing holes 353 are symmetrically arranged in the middle of the crossbeam 35. The mounting holes 331 at both ends of the crossbeam 35 are long oval holes, which are used to adjust the lateral distance tolerance of the installation of the left leaf spring combination bracket 1 and the right leaf spring combination bracket 2, avoiding the generation of prestress during the assembly of the suspension crossbeam assembly 3 and affecting the reliability of the suspension crossbeam assembly 3.

[0051] In one embodiment, the first connection bracket 31 and the second connection bracket 32 are made of a metal material with a fracture elongation rate greater than 15%.

[0052] It can be understood that the fracture elongation rate (also known as the elongation after fracture) refers to the maximum plastic deformation capacity that a material can withstand before fracture in a tensile test, usually expressed as a percentage. The higher the fracture elongation rate, the better the toughness of the material, and it can absorb more energy without brittle fracture. A material with a fracture elongation rate greater than 15% has higher toughness and ductility, can absorb more energy when subjected to impact or load, and reduce the risk of fracture.

[0053] Selecting a metal material with a fracture elongation rate greater than 15% ensures that the connection bracket has sufficient strength and toughness to meet the requirements of practical applications, taking into account the effects of static loads and dynamic loads. Through reasonable material selection, not only the performance of the connection bracket is improved, but also the overall performance and reliability of the entire suspension system are enhanced.

[0054] In one embodiment, the thickness of the first connection bracket 31 and the second connection bracket 32 is 1.5 times the thickness of the crossbeam 35.

[0055] It is understandable that the connecting bracket, as the connection point between the suspension crossbeam assembly 3 and the vehicle frame or other components, bears forces and torques from multiple directions. By increasing the thickness of the connecting bracket, its load-bearing capacity can be significantly improved, thereby enhancing the overall structural strength of the suspension crossbeam assembly 3.

[0056] During long-term driving, the suspension system will experience frequent vibrations, impacts, and load changes. A thicker connecting bracket can better resist the influence of these factors, reduce cracks and deformations caused by fatigue, and thus improve the durability of the suspension crossbeam assembly 3.

[0057] By reasonably designing the thickness ratio between the connecting bracket and the crossbeam 35, the stress distribution inside the suspension system can be optimized. A thicker connecting bracket can better disperse and transfer the forces from the vehicle frame or other components, reduce the phenomenon of local stress concentration, and thus extend the service life of the suspension crossbeam assembly 3.

[0058] Referring to Figures 5 to 7 , the present invention also provides a design matching method for the suspension crossbeam assembly 3, which is applied to the above-mentioned suspension crossbeam assembly 3. The torsional ratio stress of the front crossbeam 4 is , the torsional ratio stress of the suspension crossbeam assembly 3 is , and the torsional ratio stress of the three crossbeams 5 of the vehicle frame is ; then the torsional ratio stresses among the front crossbeam 4, the suspension crossbeam assembly 3, and the three crossbeams 5 of the vehicle frame are < < ; The bending ratio stress of the front crossbeam 4 is , the bending ratio stress of the suspension crossbeam assembly 3 is , and the bending ratio stress of the three crossbeams 5 of the vehicle frame is ; then the bending ratio stresses among the front crossbeam 4, the suspension crossbeam assembly 3, and the three crossbeams 5 of the vehicle frame are < < .

[0059] Furthermore, the torsional ratio stress of the crossbeam is defined as ; the bending ratio stress of the crossbeam is defined as ; In the formula: is the end torque of the vehicle frame crossbeam; is the torsional section modulus of the vehicle frame crossbeam; is the torsional angle under the action of the end torque T of the vehicle frame crossbeam; is the bending moment of the vehicle frame crossbeam; is the bending section modulus of the vehicle frame crossbeam; is the end load of the vehicle frame crossbeam; is the width of the frame crossbeam; is the displacement under the action of the end load F of the frame.

[0060] The present invention conducts crossbeam matching design from the perspective of specific stress, effectively improving the stress distribution of the crossbeam, and providing effective theoretical support for the forward R & D design of this type of product.

[0061] Specifically, the torsional specific stress of the front crossbeam 4, the suspension crossbeam assembly 3, and the three crossbeams 5 of the frame satisfies the following conditions < < , and the bending specific stress satisfies the following conditions < < . The torsional specific stresses of the front crossbeam 4, the suspension crossbeam assembly 3, and the three crossbeams 5 of the frame are respectively , and , and the bending specific stresses of the front crossbeam 4, the suspension crossbeam assembly 3, and the three crossbeams 5 of the frame are , and .

[0062] The torsional specific stress of the crossbeam is defined as , and the bending specific stress of the crossbeam is defined as ; where is the end torque of the frame crossbeam; is the torsional section modulus of the frame crossbeam; is the torsional angle under the action of the end torque T of the frame crossbeam; is the bending moment of the frame crossbeam; is the bending section modulus of the frame crossbeam; is the end load of the frame crossbeam; is the width of the frame crossbeam; is the displacement under the action of the end load F of the frame.

[0063] The torsional specific stress of the frame crossbeam characterizes the stress magnitude generated by the unit torsional deformation of the frame crossbeam, and the bending specific stress of the frame crossbeam characterizes the stress magnitude generated by the unit bending deformation of the frame crossbeam. The torsional specific stress and the bending specific stress of the frame crossbeam are only related to the shape and size of the frame crossbeam section. Since the frame crossbeam has a variable cross-section, the direct calculation of the above-mentioned torsional specific stress and bending specific stress of the frame is relatively complex, and the finite element software and combined with formulas can be used for calculation. The calculation results of the torsional specific stress and the bending specific stress of the frame crossbeam in this scheme are shown in Table 1.

[0064] Table 1 is the calculation result of the crossbeam specific stress

[0065] Specifically, the design matching principle of the torsion ratio stress and the crossbeam bending ratio stress is as follows: For heavy-duty dump trucks to adapt to the complex torsion working condition environment, diagonal torsion deformation will occur on the longitudinal beams on both sides of the frame assembly; the crossbeams connecting the two longitudinal beams of the frame (such as the front crossbeam 4, the suspension crossbeam assembly 3, and the frame triple crossbeam 5) will undergo torsion deformation and bending deformation driven by the longitudinal beams. At this time, the displacement change amount at the end of the front crossbeam 4 is h1, the displacement change amount at the end of the suspension crossbeam assembly 3 is h2, and the displacement change amount at the end of the frame triple crossbeam 5 is h3; from the frame deformation displacement coordination relationship, the displacement change amount h1 > h2 > h3; to ensure uniform stress distribution of the frame crossbeams and avoid the problem of excessive local stress in a certain crossbeam during the diagonal torsion deformation of the longitudinal beams, the torsion ratio stress and the crossbeam bending ratio stress of each crossbeam need to satisfy the above relationship.

[0066] Referring to Figure 7 , the frame assembly, a finite element model under the condition of the frame's complex torsion working condition is established. From its simulation results, it can be seen that the maximum stress of the suspension crossbeam assembly 3a in this solution is 209 MPa, and the maximum stress of the original suspension crossbeam assembly 3b (initial structure) is 418 MPa. The safety factor of the suspension crossbeam assembly 3 is increased to 1.5; and the stress distribution of the suspension crossbeam assembly 3 is greatly improved.

[0067] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A suspension beam assembly, characterized in that: include: At least two cross beams, the cross beams are arranged in a sheet shape, at least two cross beams are arranged side by side along a first direction, and two ends of the cross beam along the first direction are respectively provided with a first connecting hole and a second connecting hole; a first connecting bracket and a second connecting bracket, wherein the first connecting bracket is arranged at one end of the beam along the first direction, and the second connecting bracket is arranged at the other end of the beam along the first direction, the first connecting bracket is provided with a plurality of first fixing holes, and the second connecting bracket is provided with a plurality of second fixing holes; A plurality of first connecting members are respectively arranged between the first connecting hole and the first fixing hole and between the second connecting hole and the second fixing hole, so as to respectively fix the first connecting bracket and the second connecting bracket to the two ends of the beam.

2. The suspension crossbeam assembly according to claim 1, characterized in that: The first connecting bracket or the second connecting bracket includes a base and two connecting arms, the two connecting arms are arranged on both sides of the base and bent toward one side of the beam, and the plurality of the first fixing holes or the plurality of the second fixing holes are symmetrically arranged in pairs on the two connecting arms.

3. The suspension crossbeam assembly according to claim 2, characterized in that: The base is provided with a plurality of mounting holes, and the base is passed through the mounting holes via a second connecting member so as to connect the suspension crossbeam assembly to the left leaf spring combined bracket or the right leaf spring combined bracket.

4. The suspension crossbeam assembly according to claim 3, characterized in that: A circular hole for assembly process is provided in the middle of the base.

5. The suspension crossbeam assembly according to any one of claims 1 to 4, characterized in that: The crossbeam is arranged in a shape of a gold ingot with high ends and a low middle.

6. The suspension crossbeam assembly according to claim 5, characterized in that: The first connection hole and the second connection hole are elliptical holes, wherein the major axes of the elliptical holes extend along a first direction.

7. The suspension crossbeam assembly according to any one of claims 1 to 4, characterized in that: The first connecting bracket and the second connecting bracket are made of a metal material having a fracture elongation greater than 15%.

8. The suspension crossbeam assembly according to any one of claims 1 to 4, characterized in that: The thickness of the first connecting bracket and the second connecting bracket is 1.5 times the thickness of the crossbeam.

9. A design and matching method for a suspension crossbeam assembly, applied to the suspension crossbeam assembly according to any one of claims 1 to 8, characterized in that: The torsional stress ratio of the front cross beam is , the torsional stress ratio of the suspension beam assembly is , the torsional stress ratio of the three cross beams of the frame is ; Then the torsional stress ratio among the front cross beam, the suspension cross beam assembly and the three cross beams of the frame is < < ; The bending stress of the front beam is , the bending stress ratio of the suspension beam assembly is , the bending stress ratio of the three cross beams of the frame is ; Then the bending stress ratio among the front cross beam, suspension cross beam assembly and three cross beams of the frame is < < .

10. The design and matching method of the suspension crossbeam assembly according to claim 9, characterized in that: The torsional stress of the beam is defined as ; The bending stress of the beam is defined as ; Where: is the end torque of the frame cross member; is the torsional section coefficient of the frame crossbeam; is the torsion angle under the action of torque T at the end of the frame beam; is the frame beam bending moment; is the bending section coefficient of the frame crossbeam; is the load at the end of the frame crossbeam; is the width of the frame crossbeam; is the displacement of the frame end under the action of load F.

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