A connecting bracket and its design and preparation method

Abstract

The present invention relates to the technical field of heavy-duty automobile chassis parts manufacturing, and specifically to a connecting bracket and a design and preparation method thereof. The connecting bracket comprises: a bracket body, a first mounting plane and a second mounting plane are provided at both ends of the bracket body, a connecting curved surface is provided in the middle of the bracket body, the first mounting plane and the second mounting plane are connected through the connecting curved surface, and the first mounting plane and the second mounting plane are respectively connected to the post-processor bracket and the fender bracket; a conical retaining wall is provided on the second mounting plane, and the conical retaining wall intersects with the connecting curved surface to form a reinforcing rib assembly on the second mounting plane. The present application sets a conical retaining wall so that the conical retaining wall and the connecting curved surface form a reinforcing rib to share the stress of the second mounting plane, thereby avoiding fatigue fracture in this area. The connecting bracket of the present application solves the problem of insufficient strength in the local area of ​​the connecting bracket, so that the design of the connecting bracket can achieve the effect of lightweight materials such as cast aluminum while meeting the strength requirements of the bracket.

Description

Technical Field

[0001] The invention relates to the technical field of heavy-duty automobile chassis parts manufacturing, and in particular to a connecting bracket and a design and preparation method thereof. Background Art

[0002] As people's living conditions continue to improve, more and more people own private cars. The popularity of cars has brought development to auto parts manufacturing. Due to the complex structure of cars and the wide range of parts involved, every part must be intact to ensure the normal operation and competitiveness of the car. Vehicle lightweighting is one of the important development directions of the automotive industry.

[0003] In the related art, some vehicle chassis use cast aluminum alloy materials to make the connecting brackets used to connect the post-processor bracket and the fender bracket in order to achieve lightweighting. However, this type of bracket has a low safety factor and is prone to fatigue fracture under certain special working conditions. While using cast iron materials to make the connecting bracket can reduce deformation and stress, in order to meet the lightweighting requirements, such connecting brackets need to be designed into complex hollow structures, which are difficult to cast and require subsequent processing to improve the accuracy of the part mounting surface. The overall cost is high and it is difficult to achieve the lightweight effect of cast aluminum materials. Therefore, designing a connecting bracket that meets both lightweighting and strength requirements has become an urgent problem that practitioners need to solve. Summary of the Invention

[0004] In the related art, the connecting bracket of the vehicle chassis used to connect the post-processor bracket and the fender bracket cannot meet the lightweight requirements and strength requirements at the same time, resulting in the problem that the bracket is too heavy or insufficient in strength.

[0005] In a first aspect, an embodiment of the present application provides a connecting bracket, comprising:

[0006] A bracket body, having a first mounting plane and a second mounting plane at both ends thereof, a connecting curved surface being provided in the middle of the bracket body, the first mounting plane and the second mounting plane being connected via the connecting curved surface, and the first mounting plane and the second mounting plane being respectively used to connect to the post-processor bracket and the fender bracket;

[0007] A conical retaining wall is provided on the second installation plane, wherein the conical retaining wall intersects with the connecting curved surface to form a reinforcing rib assembly on the second installation plane.

[0008] In combination with the first aspect, in one embodiment, a first mounting hole is provided on the second mounting plane, and the tangent point between the connecting curved surface and the second mounting plane passes over the first mounting hole in the length direction of the connecting curved surface.

[0009] In combination with the first aspect, in one embodiment, the reinforcing rib assembly includes a first reinforcing rib and a second reinforcing rib arranged on both sides of the first mounting hole.

[0010] In combination with the first aspect, in one embodiment, the protrusions and depressions at the intersection line where the conical retaining wall intersects the connecting curved surface are both rounded.

[0011] In combination with the first aspect, in one embodiment, the chamfered corner of the intersection protrusion where the conical retaining wall intersects the connecting curved surface is a variable fillet.

[0012] In combination with the first aspect, in one embodiment, the taper draft angle of the tapered retaining wall is between 25° and 35°.

[0013] In combination with the first aspect, in one embodiment, wing surfaces are provided on both sides of the bracket body.

[0014] In combination with the first aspect, in one embodiment, intersections between the wing surface of the bracket body and the bracket body are all configured as chamfered corners.

[0015] In a second aspect, an embodiment of the present application provides a method for designing and preparing a connecting bracket, which comprises the following steps:

[0016] Conduct simulation analysis on the stent body of the connection stent and screen out stress concentration areas on the stent body;

[0017] The bracket body is prepared, and a conical retaining wall is set in the stress concentration area of ​​the bracket body to form a stress-sharing reinforcing rib component at the intersection of the conical retaining wall and the connecting curved surface.

[0018] In combination with the second aspect, in one embodiment, preparing the bracket body includes: hot stamping 22MnB5 steel plate to form the bracket body.

[0019] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0020] The applicant discovered that the stress concentration area on the second mounting plane of the fender bracket, which connects the post-processor bracket and the fender bracket, is located in this area. This applicant has designed a conical retaining wall in this area, so that the conical retaining wall and the connecting curved surface form a reinforcing rib to share the stress of the second mounting plane and prevent fatigue fracture in this area. This ingenious structure solves the problem of insufficient strength in this local area of ​​the connecting bracket, thereby enabling the connecting bracket design to achieve the effect of lightweight materials such as cast aluminum while meeting the strength requirements of the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A schematic diagram of the structure of the connection bracket for this application;

[0023] Figure 2 This is a structural diagram of a connecting bracket in the third specific embodiment of the present application;

[0024] Figure 3 This is a structural diagram of a connecting bracket in the second specific embodiment of the present application;

[0025] Figure 4 This is a structural diagram of the connecting bracket in the first specific embodiment of this application.

[0026] In the figure: 1. First mounting plane; 2. Second mounting plane; 21. First mounting hole; 22. Second mounting hole; 23. Third mounting hole; 3. Connecting curved surface; 31. Tangent point; 4. Conical retaining wall; 5. Reinforcement rib assembly; 51. First reinforcement rib; 52. Second reinforcement rib; 6. Wing surface. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 this application.

[0028] In the related art, the connecting bracket of the vehicle chassis used to connect the post-processor bracket and the fender bracket cannot meet the lightweight requirements and strength requirements at the same time, resulting in the problem that the bracket is too heavy or insufficient in strength.

[0029] First, as Figure 1 As shown, the present application provides a connecting bracket, which includes: a bracket body and a conical retaining wall 4; wherein,

[0030] The bracket body has a first mounting plane 1 and a second mounting plane 2 at both ends, and a connecting curved surface 3 is provided in the middle of the bracket body. The first mounting plane 1 and the second mounting plane 2 are connected through the connecting curved surface 3, and the first mounting plane 1 and the second mounting plane 2 are respectively used to be connected to the post-processor bracket and the fender bracket; a conical retaining wall 4 is provided on the second mounting plane 2, and the conical retaining wall 4 intersects with the connecting curved surface 3 to form a reinforcing rib assembly 5 on the second mounting plane 2.

[0031] It is understandable that the second mounting plane 2 on the bracket body in this application serves as a stress concentration area for the entire connecting bracket, making it susceptible to fatigue fracture during operation. This application utilizes a conical retaining wall 4 intersecting with the second mounting plane 2 to form a reinforcing rib assembly 5 on the second mounting plane 2, thereby distributing stress. Furthermore, the conical retaining wall 4 in this application is relatively simple to form, resulting in low cost.

[0032] In some embodiments, such as Figure 2 As shown, the second mounting plane 2 is provided with a first mounting hole 21, and the tangent point 31 between the connecting curved surface 3 and the second mounting plane 2 passes over the first mounting hole 21 in the length direction of the connecting curved surface 3. The conical retaining wall 4 allows the first mounting hole 21 to intersect with the connecting curved surface 3.

[0033] Understandably, the applicant has discovered that first mounting hole 21, as the area with the highest stress on second mounting plane 2, presents the greatest risk of fatigue fracture. The tapered retaining wall 4 and the connecting curved surface 3 form a reinforcing rib assembly 5 outside first mounting hole 21, enhancing the deformation resistance of the lower end of first mounting hole 21 and reducing the bearing stress.

[0034] In some preferred embodiments, a first mounting hole 21, a second mounting hole 22, and a third mounting hole 23 are sequentially provided on the second mounting plane 2 along a direction from the middle of the bracket body to the end of the second mounting plane 2. The tangent point 31 between the connecting curved surface 3 and the second mounting plane 2 extends beyond the first mounting hole 21 along the length of the connecting curved surface 3 and is flush with the second mounting hole 22.

[0035] It is worth noting that, as in the above embodiment, the first mounting hole 21 is the area with the highest stress. In this application, the tangent point of the connecting surface 3 is set at the second mounting hole 22, passing the first mounting hole 21, so that the reinforcing rib assembly 5 formed by the intersection of the connecting surface 3 and the conical retaining wall 4 is completely covered.

[0036] Furthermore, in order to facilitate the stamping of the conical retaining wall 4 and reduce process complexity, the conical retaining wall 4 is arranged along the shape outside the first mounting hole 21 to leave space for bolt installation. The conical retaining wall 4 has a conical surface draft angle between 25° and 35°. Preferably, the conical surface draft angle can be set to: 25°, 30°, or 35°.

[0037] Preferably, the connecting curved surface 3 intersects with the conical retaining wall 4 to form the reinforcing rib assembly 5 including a first reinforcing rib 51 and a second reinforcing rib 52 arranged on both sides of the first mounting hole 21 .

[0038] In some optional embodiments, in order to facilitate stamping, the protrusions and depressions at the intersection of the conical retaining wall 4 and the connecting curved surface 3 are both rounded.

[0039] Preferably, the chamfered angle of the convex intersection line where the conical retaining wall 4 intersects the connecting curved surface 3 is a variable angle, and the chamfered angle gradually increases from R10, R15 to R25. The chamfered angle of the concave intersection line where the conical retaining wall 4 intersects the connecting curved surface 3 can be any one of R8, R9, and R10.

[0040] In some preferred embodiments, in order to improve the anti-torsion deformation capability of the connecting bracket, wing surfaces 6 are provided on both sides of the bracket body. The width of the wing surfaces can be 20 mm to 25 mm.

[0041] Furthermore, to facilitate forming, the draft angle of the wing surface 5 can be increased to 2°, 3°, 4°, or 5°. In some preferred embodiments, the intersection of the wing surface 6 and the stent body is configured as a fillet. The fillet size can be R8, R9, or R10.

[0042] Furthermore, the bracket body, conical retaining wall 4, and wing surface 6 can be made of 22MnB5 low-alloy high-strength steel, which is formed using a hot stamping process and features ultra-high strength, low springback, and high precision. The bracket body, conical retaining wall 4, and wing surface 6 can be made with thicknesses of 3mm, 3.2mm, or 3.5mm.

[0043] In the second aspect, the present application provides an automobile chassis structure, which includes: a post-processor bracket, a fender bracket and a connecting bracket, wherein the connecting bracket is connected to both the post-processor bracket and the fender bracket. The connecting bracket includes: a bracket body and a conical retaining wall 4; wherein,

[0044] The bracket body has a first mounting plane 1 and a second mounting plane 2 at both ends, and a connecting curved surface 3 is provided in the middle of the bracket body. The first mounting plane 1 and the second mounting plane 2 are connected through the connecting curved surface 3, and the first mounting plane 1 and the second mounting plane 2 are respectively used to be connected to the post-processor bracket and the fender bracket; a conical retaining wall 4 is provided on the second mounting plane 2, and the conical retaining wall 4 intersects with the connecting curved surface 3 to form a reinforcing rib assembly 5 on the second mounting plane 2.

[0045] It is understandable that the second mounting plane 2 on the bracket body in this application serves as a stress concentration area for the entire connecting bracket, making it susceptible to fatigue fracture during operation. This application utilizes a conical retaining wall 4 intersecting with the second mounting plane 2 to form a reinforcing rib assembly 5 on the second mounting plane 2, thereby distributing stress. Furthermore, the conical retaining wall 4 in this application is relatively simple to form, resulting in low cost.

[0046] In some embodiments, such as Figure 2 As shown, the second mounting plane 2 is provided with a first mounting hole 21, and the tangent point 31 between the connecting curved surface 3 and the second mounting plane 2 passes over the first mounting hole 21 in the length direction of the connecting curved surface 3. The conical retaining wall 4 allows the first mounting hole 21 to intersect with the connecting curved surface 3.

[0047] Understandably, the applicant has discovered that first mounting hole 21, as the area with the highest stress on second mounting plane 2, presents the greatest risk of fatigue fracture. The tapered retaining wall 4 and the connecting curved surface 3 form a reinforcing rib assembly 5 outside first mounting hole 21, enhancing the deformation resistance of the lower end of first mounting hole 21 and reducing the bearing stress.

[0048] In some preferred embodiments, a first mounting hole 21, a second mounting hole 22, and a third mounting hole 23 are sequentially provided on the second mounting plane 2 along a direction from the middle of the bracket body to the end of the second mounting plane 2. The tangent point 31 between the connecting curved surface 3 and the second mounting plane 2 extends beyond the first mounting hole 21 along the length of the connecting curved surface 3 and is flush with the second mounting hole 22.

[0049] It is worth noting that, as in the above embodiment, the first mounting hole 21 is the area with the highest stress. In this application, the tangent point of the connecting surface 3 is set at the second mounting hole 22, passing the first mounting hole 21, so that the reinforcing rib assembly 5 formed by the intersection of the connecting surface 3 and the conical retaining wall 4 is completely covered.

[0050] Furthermore, in order to facilitate the formation of the conical retaining wall 4 and reduce the complexity of the process, the conical retaining wall 4 is arranged outside the mounting hole 13 along the shape to leave room for bolt installation. The conical retaining wall 4 has a conical surface draft angle between 25° and 35°. Preferably, the conical surface draft angle can be set to: 25°, 30°, 35°.

[0051] Preferably, the connecting curved surface 3 intersects with the conical retaining wall 4 to form the reinforcing rib assembly 5 including a first reinforcing rib 51 and a second reinforcing rib 52 arranged on both sides of the first mounting hole 21 .

[0052] In some optional embodiments, in order to facilitate stamping, the protrusions and depressions at the intersection of the conical retaining wall 4 and the connecting curved surface 3 are both rounded.

[0053] Preferably, the chamfered angle of the convex intersection line where the conical retaining wall 4 intersects the connecting curved surface 3 is a variable angle, and the chamfered angle gradually increases from R10, R15 to R25. The chamfered angle of the concave intersection line where the conical retaining wall 4 intersects the connecting curved surface 3 can be any one of R8, R9, and R10.

[0054] In some preferred embodiments, in order to improve the anti-torsion deformation capability of the connecting bracket, wing surfaces 6 are provided on both sides of the bracket body. The width of the wing surfaces can be 20 mm to 25 mm.

[0055] Furthermore, to facilitate forming, the draft angle of the wing surface 5 can be increased to 2°, 3°, 4°, or 5°. In some preferred embodiments, the intersection of the wing surface 6 and the stent body is configured as a fillet. The fillet size can be R8, R9, or R10.

[0056] Furthermore, the support body, the conical retaining wall 4 and the wing surface 6 can be made of 22MnB5 low-alloy high-strength steel, and the thickness of the support body, the conical retaining wall 4 and the wing surface 6 can be 3 mm, 3.2 mm or 3.5 mm.

[0057] In a third aspect, the present application provides an automobile, comprising: a post-processor bracket, a fender bracket, and a connecting bracket, wherein the connecting bracket is connected to both the post-processor bracket and the fender bracket. The connecting bracket comprises: a bracket body and a conical retaining wall 4;

[0058] The bracket body has a first mounting plane 1 and a second mounting plane 2 at both ends, and a connecting curved surface 3 is provided in the middle of the bracket body. The first mounting plane 1 and the second mounting plane 2 are connected through the connecting curved surface 3, and the first mounting plane 1 and the second mounting plane 2 are respectively used to be connected to the post-processor bracket and the fender bracket; a conical retaining wall 4 is provided on the second mounting plane 2, and the conical retaining wall 4 intersects with the connecting curved surface 3 to form a reinforcing rib assembly 5 on the second mounting plane 2.

[0059] It is understandable that the second mounting plane 2 on the bracket body in this application serves as a stress concentration area for the entire connecting bracket, making it susceptible to fatigue fracture during operation. This application utilizes a conical retaining wall 4 intersecting with the second mounting plane 2 to form a reinforcing rib assembly 5 on the second mounting plane 2, thereby distributing stress. Furthermore, the conical retaining wall 4 in this application is relatively simple to form, resulting in low cost.

[0060] In some embodiments, such as Figure 2 As shown, the second mounting plane 2 is provided with a first mounting hole 21, and the tangent point 31 between the connecting curved surface 3 and the second mounting plane 2 passes over the first mounting hole 21 in the length direction of the connecting curved surface 3. The conical retaining wall 4 allows the first mounting hole 21 to intersect with the connecting curved surface 3.

[0061] Understandably, the applicant has discovered that first mounting hole 21, as the area with the highest stress on second mounting plane 2, presents the greatest risk of fatigue fracture. The tapered retaining wall 4 and the connecting curved surface 3 form a reinforcing rib assembly 5 outside first mounting hole 21, enhancing the deformation resistance of the lower end of first mounting hole 21 and reducing the bearing stress.

[0062] In some preferred embodiments, a first mounting hole 21, a second mounting hole 22, and a third mounting hole 23 are sequentially provided on the second mounting plane 2 along a direction from the middle of the bracket body to the end of the second mounting plane 2. The tangent point 31 between the connecting curved surface 3 and the second mounting plane 2 extends beyond the first mounting hole 21 along the length of the connecting curved surface 3 and is flush with the second mounting hole 22.

[0063] It is worth noting that, as in the above embodiment, the first mounting hole 21 is the area with the highest stress. In this application, the tangent point of the connecting surface 3 is set at the second mounting hole 22, passing the first mounting hole 21, so that the reinforcing rib assembly 5 formed by the intersection of the connecting surface 3 and the conical retaining wall 4 is completely covered.

[0064] Furthermore, in order to facilitate the formation of the conical retaining wall 4 and reduce the complexity of the process, the conical retaining wall 4 is arranged outside the mounting hole 13 along the shape to leave room for bolt installation. The conical retaining wall 4 has a conical surface draft angle between 25° and 35°. Preferably, the conical surface draft angle can be set to: 25°, 30°, 35°.

[0065] Preferably, the connecting curved surface 3 intersects with the conical retaining wall 4 to form the reinforcing rib assembly 5 including a first reinforcing rib 51 and a second reinforcing rib 52 arranged on both sides of the first mounting hole 21 .

[0066] In some optional embodiments, in order to facilitate stamping, the protrusions and depressions at the intersection of the conical retaining wall 4 and the connecting curved surface 3 are both rounded.

[0067] Preferably, the chamfered angle of the convex intersection line where the conical retaining wall 4 intersects the connecting curved surface 3 is a variable angle, and the chamfered angle gradually increases from R10, R15 to R25. The chamfered angle of the concave intersection line where the conical retaining wall 4 intersects the connecting curved surface 3 can be any one of R8, R9, and R10.

[0068] In some preferred embodiments, in order to improve the anti-torsion deformation capability of the connecting bracket, wing surfaces 6 are provided on both sides of the bracket body. The width of the wing surfaces can be 20 mm to 25 mm.

[0069] Furthermore, to facilitate forming, the draft angle of the wing surface 5 can be increased to 2°, 3°, 4°, or 5°. In some preferred embodiments, the intersection of the wing surface 6 and the stent body is configured as a fillet. The fillet size can be R8, R9, or R10.

[0070] Furthermore, the support body, the conical retaining wall 4 and the wing surface 6 can be made of 22MnB5 low-alloy high-strength steel, and the thickness of the support body, the conical retaining wall 4 and the wing surface 6 can be 3 mm, 3.2 mm or 3.5 mm.

[0071] Furthermore, the present application provides a method for designing and preparing a connecting bracket, which comprises the following steps:

[0072] Step S1: simulate and analyze the support body of the connection support, and screen out stress concentration areas on the support body.

[0073] Step S2: prepare the bracket body, and set a conical retaining wall 4 in the stress concentration area of ​​the bracket body to form a stress-sharing reinforcing rib component 5 at the intersection of the conical retaining wall 4 and the connecting curved surface 3.

[0074] The above step S2 includes: hot stamping 22MnB5 steel plate to form the bracket body

[0075] Specifically, the raw materials are heated to 930-950°C and kept warm for 5 minutes; the mold is quickly moved and positioned; the mold is closed and stamped, and the mold is pressure-maintained and quenched for 20-30 seconds; the mold is opened and the sample is taken out.

[0076] It can be understood that the use of 22MnB5 hot stamping to form the connecting bracket greatly reduces the rebound of the part, ensures the forming accuracy of the part, and at the same time makes the part material have a minimum yield strength of 950MPa, so that a thinner material thickness can be used to achieve a sufficient safety factor for the part.

[0077] Furthermore, in order to verify the effects of the embodiments, this application provides three measurement results of the embodiments.

[0078] In the first specific embodiment, Figure 3 As shown, no conical retaining wall is provided. The connecting curved surface 3 smoothly connects to the first mounting plane 1 and the second mounting plane 2, respectively. The tangent point 31 with the first mounting plane 1 is located at the first mounting hole 21. The wing surface 6 is 25 mm wide and has a draft angle of 3°. The intersection of the wing surface 6 with the bracket body on both sides is rounded with an R8 radius. The connecting bracket has a wall thickness of 3 mm.

[0079] Structural CAE analysis of the connecting bracket in the first specific embodiment shows a maximum stress value of 451 MPa. The maximum stress value area is located near the first mounting hole 21 of the second mounting plane 2. The safety factor is calculated to be 2.11 based on the yield strength of 22MnB5 of 950 MPa.

[0080] In the second specific embodiment, Figure 4 As shown, a conical retaining wall 4 is provided along the shape outside the first mounting hole 21 to make way for the bolt installation position, and the draft angle of the conical retaining wall 4 is: 20°. The connecting curved surface 3 between the first mounting plane 1 and the second mounting plane 2 is moved to a position near the tangent point 31 on the second mounting plane 2 to a position near the second mounting hole 32. The conical retaining wall 4 intersects with the connecting curved surface 3, and the convex part of the intersection line is rounded, and the rounded corner size is R8. The concave part is rounded, and the rounded corner size can be R5. Wing surfaces 6 are added on both sides of the bracket theme, and the width of the wing surface 6 is 25mm. The draft angle of the wing surface 6 is increased to 3°. The wing surface 6 and the two mounting planes and the connecting curved surface 3 are rounded respectively, and the rounded corner size can be R8. The thickness of the steel plate used for the connecting bracket parts can be: 3mm.

[0081] It is worth noting that, after structural CAE analysis of the connecting bracket in the second specific embodiment, the stress concentration points in the simulation results are dispersed into three places, and the maximum stress value is reduced to 371 MPa, located at the second reinforcement rib 52 on the right side. The safety factor is calculated as 2.56 based on the yield strength of 22MnB5 of 950 MPa, which reaches the preset value.

[0082] In the third specific embodiment, Figure 1 As shown, a conical retaining wall is provided, and a conical retaining wall 4 is provided along the shape outside the first mounting hole 12 to make way for the bolt installation position, and the draft angle of the conical surface is: 30°. The position of the tangent point 31 of the connecting curved surface 3 between the first mounting plane 1 and the second mounting plane 2 close to the second mounting plane 2 is moved from the position near the first mounting hole 21 to the position near the second mounting hole 22. The conical retaining wall 4 intersects with the connecting curved surface 3, and the variable fillet of the convex part of the intersection line gradually increases from R10, R15 to R25. The concave part is rounded, and the fillet size can be R10. Wing surfaces 6 are added on both sides of the part to improve the part's resistance to torsional deformation, and the wing surface width is 22mm. The draft angle of the wing surface 6 can be increased by 3°. The wing surface 6 and the mounting plane and the connecting curved surface are rounded respectively, and the fillet size can be R8. The overall part of the connecting bracket can be made of steel plate with a thickness of: 3mm.

[0083] It should be noted that structural CAE analysis of the connecting bracket shows that stress concentration has been dispersed to multiple locations, with the maximum stress value reduced to 352 MPa at the second reinforcement rib 52 on the right side. Based on the yield strength of 22MnB5 (950 MPa), the safety factor is calculated to be 2.70, meeting the safety factor requirements for the part.

[0084] The CAE analysis results of the above three embodiments and failed parts are shown in the following table:

[0085]

[0086] It can be seen from this that the embodiments of the present application have an improved effect on parts safety and provide a more flexible design concept for the connection bracket design.

[0087] In summary, this application provides a conical retaining wall in this area, so that the conical retaining wall and the connecting curved surface form a reinforcing rib to share the stress of the second mounting plane and prevent fatigue fracture in this area. This application solves the problem of insufficient strength in the local area of ​​the connecting bracket through a clever structure, thereby allowing the connecting bracket design to use lightweight materials such as cast aluminum while meeting the bracket's strength requirements.

[0088] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 on this application. Unless otherwise clearly specified and limited, the terms "installed", "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 a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0089] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0090] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those 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 application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A connecting bracket, characterized in that: include: A bracket body, with a first mounting plane (1) and a second mounting plane (2) provided at both ends thereof, a connecting curved surface (3) provided in the middle of the bracket body, the first mounting plane (1) and the second mounting plane (2) being connected via the connecting curved surface (3), and the first mounting plane (1) and the second mounting plane (2) being used to connect to the post-processor bracket and the fender bracket, respectively; A conical retaining wall (4) is provided on the second mounting plane (2), wherein the conical retaining wall (4) intersects with the connecting curved surface (3) to form a reinforcing rib assembly (5) on the second mounting plane (2); A first mounting hole (21) is provided on the second mounting plane (2), and a tangent point (31) between the connecting curved surface (3) and the second mounting plane (2) passes over the first mounting hole (21) in the length direction of the connecting curved surface (3).

2. The connecting bracket according to claim 1, wherein: The reinforcing rib assembly (5) comprises a first reinforcing rib (51) and a second reinforcing rib (52) arranged on both sides of the first mounting hole (21).

3. The connecting bracket according to claim 1, wherein: The convex and concave parts of the intersection line where the conical retaining wall (4) intersects with the connecting curved surface (3) are both rounded.

4. The connecting bracket according to claim 3, wherein: The chamfered corner of the intersection line where the conical retaining wall (4) and the connecting curved surface (3) intersect is a variable rounded corner.

5. The connecting bracket according to claim 1, wherein: The taper draft angle of the tapered retaining wall (4) is between 25° and 35°.

6. The connecting bracket according to claim 1, wherein: Wing surfaces (6) are provided on both sides of the bracket body.

7. The connecting bracket according to claim 1, wherein: The intersection of the wing surface (6) of the bracket body and the bracket body is configured as a chamfered corner.

8. A method for designing and preparing a connecting bracket according to claim 1, characterized in that: The following steps are involved: Conduct simulation analysis on the stent body of the connection stent and screen out stress concentration areas on the stent body; The bracket body is prepared, and a conical retaining wall (4) is provided in the stress concentration area of ​​the bracket body to form a stress-sharing reinforcing rib component (5) at the intersection of the conical retaining wall (4) and the connecting curved surface (3).

9. The method for designing and preparing a connecting bracket according to claim 8, wherein: The preparation of the bracket main body includes: hot stamping 22MnB5 steel plate to form the bracket main body.

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