An optimized exhaust manifold heat shield structure
By optimizing the edge path and using a rounded transition section in the exhaust manifold heat shield structure, the problem of fracture caused by stress concentration was solved, achieving a higher fatigue safety factor and structural stability, making it suitable for rapid iteration of mass-produced models.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGLING MOTORS
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-21
AI Technical Summary
The existing exhaust manifold heat insulation plate has an unreasonable edge design at the connection, which leads to stress concentration, making it prone to fracture failure and fatigue safety factor lower than the standard.
An edge banding is provided at the connection between the heat insulation board body and the connecting plate. One end of the edge banding extends to the outer edge of the heat insulation board, and the other end extends along the side of the connecting plate to the corner. A rounded transition section is used instead of a right-angle transition to form an integral molding structure.
By optimizing the edge binding path and adding a rounded transition section, the stress distribution was made more uniform, the minimum fatigue safety factor was increased to 1.266, fracture was avoided, service life was extended, and design and manufacturing costs were reduced.
Smart Images
Figure CN224532812U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts technology, specifically to an optimized exhaust manifold heat insulation plate structure. Background Technology
[0002] Existing exhaust manifold heat shields typically consist of a heat shield body, a connecting plate, and mounting holes, used to provide thermal insulation protection for the exhaust manifold. The mounting holes on the connecting plate are the critical connection points between the heat shield and the exhaust manifold, and must withstand continuous vibration loads during assembly and vehicle operation. However, in durability tests of new vehicle models, these heat shields often exhibit fracture failure, with crack initiation concentrated near the mounting holes.
[0003] Analysis revealed that the main defect in the existing structure stemmed from the unreasonable edge design at the connection between the insulation panel and the connecting plate: the edge cutoff point was too far from the corner of the connecting plate, causing stress concentration around the mounting holes and preventing effective stress dispersion. Furthermore, if the transition between the main body and the connecting plate was at a right angle, it would further exacerbate stress concentration, causing the fatigue safety factor of the insulation panel under cyclic loads to fall below the evaluation standard, ultimately leading to fracture. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides an optimized exhaust manifold heat insulation plate structure, which solves the defects of existing structures. The defects mainly stem from the unreasonable edge-wrapping design at the connection between the heat insulation plate body and the connecting plate.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an optimized exhaust manifold heat insulation plate structure, including a heat insulation plate body, a connecting plate provided on the heat insulation plate body, and an edge banding provided at the connection between the heat insulation plate body and the connecting plate. One end of the edge banding extends toward the outer edge of the heat insulation plate body, and the other end of the edge banding extends along the side of the connecting plate to the corner.
[0006] Preferably, the connection between the heat insulation board body and the connecting plate is provided with an arc transition section.
[0007] Preferably, the heat insulation board body, connecting plate and arc transition section are integrally formed.
[0008] Preferably, both ends of the arc transition section extend toward the edge.
[0009] Preferably, the connecting plate has a through mounting hole.
[0010] Preferably, the mounting hole is located at the geometric center of the outer side of the connecting plate.
[0011] Its beneficial effects are as follows:
[0012] 1. The optimized exhaust manifold heat insulation panel structure, by optimizing the extension path of the edging, extends one end to the outer edge of the heat insulation panel body and the other end extends along the side of the connecting plate to the corner, increasing the stress-bearing area around the mounting holes and making the stress distribution more uniform. The minimum fatigue safety factor of the optimized heat insulation panel is increased to 1.266, effectively solving the fracture problem near the mounting holes, and has passed durability tests.
[0013] 2. This optimized exhaust manifold heat shield structure features a rounded transition section at the connection between the heat shield body and the connecting plate, replacing the traditional right-angle transition. This significantly reduces local stress peaks. Simultaneously, the rounded transition section extends towards the edges at both ends, forming a continuous stress transfer path and further preventing stress concentration at the connection point. The heat shield body, connecting plate, and rounded transition section are integrally molded, eliminating weak points caused by splicing or assembly, ensuring the stability of the overall structure under vibration loads, and extending service life. Strength improvement is achieved solely through optimizing the edge position and adding a transition structure, without requiring major modifications to the overall heat shield structure, reducing design and manufacturing costs and making it suitable for the rapid iteration needs of mass-produced vehicles. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] Figure 2 This is a partial structural diagram of the present invention;
[0017] Figure 3 This is a schematic diagram of the fatigue CAE analysis results of the heat insulation board of this utility model.
[0018] In the diagram: 1. Main body of the heat insulation board; 2. Connecting plate; 21. Arc transition section; 22. Edge banding; 23. Mounting hole. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0020] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0021] This utility model discloses an optimized exhaust manifold heat insulation plate structure, according to the attached... Figures 1-2 As shown, it includes a heat insulation board body 1, a connecting plate 2 is provided on the heat insulation board body 1, and a edging 22 is provided at the connection between the heat insulation board body 1 and the connecting plate 2. One end of the edging 22 extends toward the outer edge of the heat insulation board body 1, and the other end of the edging 22 extends along the side of the connecting plate 2 to the corner.
[0022] By optimizing the extension path of the edging 22, one end extends towards the outer edge of the insulation board body 1, and the other end extends along the side of the connecting plate 2 to the corner, increasing the stress-bearing area around the mounting hole 23 and making the stress distribution more uniform. After optimization, the minimum fatigue safety factor of the insulation board is increased to 1.266, effectively solving the fracture problem near the mounting hole 23, and passing the durability test.
[0023] According to the appendix Figure 2 As shown, a circular arc transition section 21 is further provided at the connection between the heat insulation board body 1 and the connecting plate 2.
[0024] The heat insulation board body 1, the connecting plate 2, and the arc transition section 21 are integrally formed.
[0025] The two ends of the arc transition section 21 extend toward the edge 22.
[0026] The connecting plate 2 has a through mounting hole 23.
[0027] Mounting hole 23 is located at the geometric center of the outer side of connecting plate 2.
[0028] The arc-shaped transition section 21 at the connection between the heat insulation panel body 1 and the connecting plate 2 replaces the traditional right-angle transition, significantly reducing local stress peaks. Simultaneously, the arc-shaped transition section 21 extends towards the edge 22 at both ends, forming a continuous stress transmission path and further preventing stress concentration at the connection point. The heat insulation panel body 1, connecting plate 2, and arc-shaped transition section 21 are integrally molded, eliminating weak points caused by splicing or assembly, ensuring the stability of the overall structure under vibration loads, and extending service life. Strength improvement is achieved solely by optimizing the position of the edge 22 and adding a transition structure, without requiring major modifications to the overall structure of the heat insulation panel, reducing design and manufacturing costs and making it suitable for the rapid iteration needs of mass-produced vehicles.
[0029] According to the appendix Figure 3As shown, further, the stress process of the exhaust manifold heat insulation plate was simulated by adding accelerations in different directions. The minimum fatigue safety factor of the exhaust manifold heat insulation plate was calculated by cyclically applying stress conditions in different directions. The optimized bracket fatigue CAE analysis results, after eliminating stress-ineffective areas such as contact points, show a minimum fatigue safety factor of 1.266, which is greater than the CAE evaluation standard of 1.1, meeting the strength requirements, and ultimately passing the durability test.
[0030] The optimized edging 22 extends along the side of the connecting plate 2 to the corner, expanding the connection range with the heat insulation board body 1. This allows the vibration load on the mounting hole 23 to be transferred to a larger area of the heat insulation board body 1 through the edging 22, avoiding excessive local stress.
[0031] The arc transition section 21 connects the insulation board body 1 and the connecting plate 2 via a smooth curve. When the load is transferred from the insulation board body 1 to the connecting plate 2, the arc structure can transform concentrated stress into dispersed stress distributed along the curve, reducing the stress peaks that may occur during right-angle transitions. At the same time, the arc transition section 21 and the extended edge 22 cooperate to form a continuous stress system of "edge-transition section-body", further improving the stability of stress transmission.
[0032] The integrally formed heat insulation panel body 1, connecting plate 2, and arc transition section 21 ensure that there are no gaps between the components. Vibration loads can be evenly transmitted through the overall structure, avoiding secondary stress concentration at the connection points in the assembled structure. This maintains a high fatigue safety factor under cyclic loads and enables the heat insulation panel to work stably for a long time.
[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. An optimized exhaust manifold heat insulation panel structure, comprising a heat insulation panel body (1), characterized in that, A connecting plate (2) is provided on the heat insulation board body (1). A edging (22) is provided at the connection between the heat insulation board body (1) and the connecting plate (2). One end of the edging (22) extends toward the outer edge of the heat insulation board body (1), and the other end of the edging (22) extends along the side of the connecting plate (2) to the corner.
2. The optimized exhaust manifold heat insulation plate structure according to claim 1, characterized in that, An arc transition section (21) is provided at the connection between the heat insulation board body (1) and the connecting plate (2).
3. The optimized exhaust manifold heat insulation plate structure according to claim 2, characterized in that, The heat insulation board body (1), connecting plate (2) and arc transition section (21) are integrally formed.
4. The optimized exhaust manifold heat insulation plate structure according to claim 2, characterized in that, The two ends of the arc transition section (21) extend toward the edge (22).
5. The optimized exhaust manifold heat insulation plate structure according to claim 1, characterized in that, The connecting plate (2) has a through mounting hole (23).
6. The optimized exhaust manifold heat insulation plate structure according to claim 5, characterized in that, The mounting hole (23) is located at the geometric center on the outside of the connecting plate (2).