Automobile exhaust front pipe fastening structure

Abstract

The utility model relates to the technical field of automobile exhaust pipes, in particular to an automobile exhaust front pipe fastening structure which comprises an exhaust front pipe body, a fastening flange used for being connected with an engine is arranged at one end of the exhaust front pipe body, and a joining flange matched with the fastening flange is arranged at one end of the engine. Three first connecting lugs are evenly arranged on the side wall of the fastening flange, three second connecting lugs are evenly arranged on the side wall of the joining flange, the first connecting lugs and the second connecting lugs are connected through fastening bolts, each fastening bolt is composed of a double-end stud and a nut, and a sealing washer is arranged on the side, close to the joining flange, of the fastening flange. The fastening flange and the joining flange are of the equilateral triangle structure and are fixed through the fastening bolts, so that the clamping force of the flange faces is effectively guaranteed, and the air leakage phenomenon of the sealing gasket between every two adjacent fastening points can be effectively avoided; the fastening bolt is of a double-end stud and nut structure, so that installation is easy and convenient, and the situation that the fastening effect is affected due to deviation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of automotive exhaust pipe technology, and in particular to a fastening structure for an automotive exhaust front pipe. Background Technology

[0002] Traditional exhaust front pipe structures are often fixed with simple nuts. After prolonged use, due to factors such as vibration and thermal expansion, the exhaust front pipe is prone to detachment or loosening, which not only affects vehicle performance but may also pose safety hazards. Therefore, developing an exhaust front pipe structure with anti-detachment function has significant practical significance and application value. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a fastening structure for the front exhaust pipe of an automobile.

[0004] This utility model provides the following technical solution: a fastening structure for an automotive exhaust front pipe, comprising an exhaust front pipe body, one end of which is provided with a fastening flange for connection to an engine, and one end of the engine is provided with a connecting flange adapted to the fastening flange. The fastening flange has three first connecting ears evenly distributed on its side wall, and the connecting flange has three second connecting ears evenly distributed on its side wall. The first connecting ears and the second connecting ears are connected by fastening bolts, which consist of studs and nuts. A sealing gasket is provided on the side of the fastening flange near the connecting flange.

[0005] This utility model discloses a fastening structure for a car exhaust front pipe. By uniformly arranging first and second connecting ears on the side walls of the fastening flange and the connecting flange, the fastening flange and the connecting flange form an equilateral triangle structure. Then, by using fastening bolts to fix them, a triangular fastening method is formed, which effectively ensures the clamping force of the flange surface and can effectively prevent air leakage between the sealing gaskets of two adjacent fastening points. The fastening bolts adopt a double-ended stud and nut structure, which makes the installation simple and convenient and will not cause misalignment that would affect the fastening effect.

[0006] Furthermore, both the double-ended stud and the nut are made of heat-resistant steel.

[0007] Furthermore, the surface of the nut is coated with a high-temperature resistant plating layer.

[0008] Furthermore, the internal threads of the nut are coated with adhesive.

[0009] Furthermore, the double-ended stud is also provided with two spring washers, which are located on the side of the nut near the fastening flange or the connecting flange.

[0010] Furthermore, the first connecting lug is integrally formed with the fastening flange, and the second connecting lug is integrally formed with the connecting flange.

[0011] Furthermore, both the first connecting ear and the second connecting ear are arc-shaped structures.

[0012] Furthermore, the fastening flange has a locking groove on the side near the connecting flange, and the sealing gasket is located in the locking groove and is adapted to it. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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.

[0014] Figure 1 This is a schematic diagram of the automotive exhaust front pipe fastening structure of this utility model.

[0015] Figure 2 This is a front view of the exhaust front pipe in the automotive exhaust front pipe fastening structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the fastening flange in the automotive exhaust front pipe fastening structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the connecting flange in the automotive exhaust front pipe fastening structure of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 10. Exhaust front pipe body; 11. Fastening flange; 111. First connecting lug; 112. Locking groove; 113. Sealing gasket; 12. Connecting flange; 13. Fastening bolt; 131. Double-ended stud; 132. Nut; 133. Spring washer. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0024] Reference Figures 1 to 4 In one embodiment of this utility model, a fastening structure for an automotive exhaust front pipe includes an exhaust front pipe body 10. One end of the exhaust front pipe body 10 is provided with a fastening flange 11 for connection with an engine. One end of the engine is provided with a connecting flange 12 adapted to the fastening flange 11. The side wall of the fastening flange 11 is provided with three first connecting ears 111 evenly, and the side wall of the connecting flange 12 is provided with three second connecting ears evenly. The first connecting ears 111 and the second connecting ears are connected by fastening bolts 13. The fastening bolts 13 are composed of double-ended studs 131 and nuts 132. A sealing gasket 113 is provided on the side of the fastening flange 11 near the connecting flange 12.

[0025] In one embodiment of the automobile exhaust front pipe fastening structure, the first connecting lug 111 and the second connecting lug are evenly arranged on the side walls of the fastening flange 11 and the connecting flange 12, so that the fastening flange 11 and the connecting flange 12 form an equilateral triangle structure. Then, the fastening bolts 13 are used to fix it, forming a triangular fastening method, which effectively ensures the clamping force of the flange surface and can effectively prevent air leakage of the sealing gasket 113 between two adjacent fastening points. The fastening bolts 13 adopt a double-ended stud 131 plus nut 132 structure, which makes the installation simple and convenient and will not cause misalignment to affect the fastening effect.

[0026] Both the stud 131 and nut 132 are made of heat-resistant steel. Using the same high-temperature resistant material ensures they have the same coefficient of thermal expansion, preventing significant torque reduction and loosening due to differences in expansion coefficients after repeated thermal shocks. The surface of the nut 132 is coated with a high-temperature resistant plating (not shown), preventing sintering between the stud 131 and nut 132 due to their identical materials. An adhesive (not shown) is applied to the internal threads of the nut 132, forming a rigid bond between the nut 132 and the stud 131, further enhancing the adhesion between the nut 132 and the stud 131. The stability of the stud 131 connection; the double-ended stud 131 is also provided with two spring washers 133, which are located on the side of the nut 132 near the fastening flange 11 or connecting flange 12. The spring washers 133 can effectively prevent damage to the surface of the exhaust pipe flange caused by the rotation of the end face anti-loosening nut 132, and prevent long-term thermal shock and vibration failure. In this embodiment, both the double-ended stud 131 and the nut 132 are made of SUH660 heat-resistant steel. The high-temperature resistant coating on the surface of the nut 132 is specifically a nickel-based alloy coating. The adhesive on the internal thread of the nut 132 is specifically a high-temperature anaerobic adhesive, which can be used stably at high temperatures and is not affected by the temperature of the exhaust pipe.

[0027] The first connecting lug 111 is integrally formed with the fastening flange 11, and the second connecting lug is integrally formed with the connecting flange 12. The integrally formed structure has better stability and ensures that the first connecting lug 111 and the second connecting lug are subjected to stable and uniform stress. Both the first connecting lug 111 and the second connecting lug have a rounded structure. The rounded structure can prevent the first connecting lug 111 or the second connecting lug from scratching the installers. At the same time, the rounded structure can also distribute the stress on the first connecting lug 111 or the second connecting lug, preventing the first connecting lug 111 or the second connecting lug from cracking.

[0028] The fastening flange 11 has a locking groove 112 on one side near the connecting flange 12. The sealing gasket 113 is located in the locking groove 112 and is adapted to it. The locking groove 112 can limit the sealing gasket 113, improve the installation efficiency of the sealing gasket 113, and prevent the sealing gasket 113 from sliding during installation. In this embodiment, the thickness of the sealing gasket 113 is greater than the groove depth of the locking groove 112.

[0029] In this embodiment, the cross-section of the fastening flange 11 is slightly larger than that of the connecting flange 12, which can reduce the mass of the fastening structure of the exhaust front pipe, adapt to the engine installation space, and the asymmetrical design can better adapt to the deformation differences caused by temperature changes, thus improving the stability of the fastening.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fastening structure for a car exhaust front pipe, comprising an exhaust front pipe body, characterized in that, One end of the exhaust front pipe body is provided with a fastening flange for connecting to the engine, and one end of the engine is provided with a connecting flange adapted to the fastening flange. The fastening flange has three first connecting ears evenly distributed on its side wall, and the connecting flange has three second connecting ears evenly distributed on its side wall. The first connecting ears and the second connecting ears are connected by fastening bolts, which consist of studs and nuts. The fastening flange has a sealing gasket on the side near the connecting flange.

2. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, Both the double-ended stud and the nut are made of heat-resistant steel.

3. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, The surface of the nut is coated with a high-temperature resistant plating.

4. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, The internal threads of the nut are coated with adhesive.

5. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, The double-ended stud is also provided with two spring washers, which are located on the side of the nut near the fastening flange or the connecting flange.

6. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, The first connecting lug is integrally formed with the fastening flange, and the second connecting lug is integrally formed with the connecting flange.

7. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, Both the first connecting ear and the second connecting ear have an arc structure.

8. The automotive exhaust front pipe fastening structure according to claim 1, characterized in that, The fastening flange has a locking groove on one side near the connecting flange, and the sealing gasket is located in the locking groove and is adapted to it.

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