Connecting structure for eliminating fracture risk of catalytic converter connecting support and pipeline

Abstract

The utility model discloses a connecting structure for eliminating the fracture risk of a catalytic converter connecting support and a pipeline, and belongs to the field of automobile machining. The device mainly comprises an engine and a catalytic converter, an exhaust manifold is arranged at one end of the catalytic converter, the exhaust manifold is connected with the catalytic converter through a connecting pipe and a movable connecting mechanism, one end of the connecting pipe is fixedly connected with the catalytic converter, the movable connecting mechanism comprises a spherical flange and an exhaust flange, and the spherical end of the spherical flange is fixedly connected with a transition pipe. The transition pipe is fixedly connected with the connecting pipe in a sealed mode, the exhaust flange is fixedly connected with the exhaust manifold in a sealed mode, a spherical sealing gasket is arranged in the spherical flange, and the spherical flange is fixedly connected with the exhaust flange through a spring bolt. The movable connecting mechanism is additionally arranged between the exhaust manifold and the catalytic converter, on one hand, the assembling tolerance is reduced, and meanwhile the assembling difficulty is lowered; and on the other hand, the cracking risk, caused by engine vibration, of the exhaust manifold, the catalytic converter pipeline or the support is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of automobile processing, and more particularly to a connection structure for eliminating the risk of cracking of a catalytic converter connection bracket and a pipeline. Background Art

[0002] At present, an automobile catalytic converter is mainly installed on an engine exhaust manifold through bolts and nuts, and then connected to other parts of the engine through a bracket to achieve an overall rigid connection.

[0003] For example, the patent with the authorization publication number "CN204060887U" discloses an exhaust manifold for connecting a catalytic converter bracket, which includes a packaging shell. The packaging shell is fixedly connected to an engine bracket, the engine bracket is fixedly connected to a catalytic converter bracket. The catalytic converter bracket is provided with a first mounting hole, and the engine bracket is provided with a second mounting hole. The catalytic converter bracket and the engine bracket are fixedly connected through bolts via the first mounting hole and the second mounting hole. Among them, at least one of the first mounting hole and the second mounting hole is kidney-shaped.

[0004] Although the above patent solves the problem of compensating for the radial movement of the bracket mounting hole on the carrier after the reduction of the shell surface caused by the reduction of the shell diameter through the structure of the kidney-shaped hole. However, there are still the following defects: 1. Since the catalytic converter and the power assembly are rigidly connected, during the manufacturing process, it is easy for each component to have tolerance accumulation, resulting in difficult installation of components and the phenomenon of inability to assemble; 2. During the movement of the engine, vibrations will be generated, and the rigid connection is likely to cause cracking of the exhaust manifold or the catalytic converter pipeline and bracket. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a connection structure for eliminating the risk of cracking of a catalytic converter connection bracket and a pipeline. An active connection mechanism is added between the exhaust manifold and the catalytic converter. On the one hand, it reduces the assembly tolerance and at the same time reduces the assembly difficulty; on the other hand, it reduces the risk of cracking of the exhaust manifold, the catalytic converter pipeline or the bracket caused by engine vibration.

[0006] The connection structure for eliminating the risk of cracking of a catalytic converter connection bracket and a pipeline includes an engine and a catalytic converter. One end of the catalytic converter is provided with an exhaust manifold. The exhaust manifold and the catalytic converter are connected through a connecting pipe and an active connection mechanism. One end of the connecting pipe is fixedly connected to the catalytic converter. The active connection mechanism includes a spherical flange and an exhaust flange. The spherical end of the spherical flange is fixedly connected with a transition pipe. The transition pipe is hermetically and fixedly connected to the connecting pipe. The exhaust flange is hermetically and fixedly connected to the exhaust manifold. A spherical gasket is arranged inside the spherical flange. The spherical flange and the exhaust flange are fixedly connected through a spring bolt.

[0007] Preferably, a boss for closely fitting with the inner end face of the spherical gasket is provided on one side of the exhaust flange away from the exhaust manifold. An inner pipe communicating with the exhaust manifold is provided on the boss, and the inner pipe extends into the spherical gasket.

[0008] Preferably, at least two groups of corresponding mounting holes are provided on both the spherical flange and the exhaust flange. Spring bolts pass through the mounting holes and are fixedly connected.

[0009] Preferably, an over-bracket one and an over-bracket two are fixedly connected to the engine. An assembly hole one is provided on the over-bracket one, and a long hole one is provided on the over-bracket two; an over-bracket four cooperating with the over-bracket one and an over-bracket three cooperating with the over-bracket two are fixedly connected to the catalytic converter. A long hole two cooperating with the assembly hole one is provided on the over-bracket four, and an assembly hole two cooperating with the long hole one is provided on the over-bracket three.

[0010] Preferably, the long hole one and the long hole two are in an enlarged hole structure or a long strip structure.

[0011] Preferably, the over-bracket one and the over-bracket four, and the over-bracket two and the over-bracket three are respectively fixedly connected by bolts.

[0012] Preferably, a muffler is provided at one end of the catalytic converter away from the exhaust manifold. A flexible connecting pipe is provided between the muffler and the catalytic converter, and both ends of the flexible connecting pipe are fixedly connected to the pipes of the muffler and the catalytic converter respectively.

[0013] Preferably, the flexible connecting pipe is a metal bellows or a metal hose.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. An active connection mechanism is added to change the rigid connection between the original exhaust manifold and the catalytic converter into an active connection between multiple independent components. On the one hand, the assembly tolerance is reduced and the assembly difficulty is lowered; on the other hand, the cracking risk of the exhaust manifold, the catalytic converter pipeline or the bracket caused by engine vibration is reduced; the spring bolts are used for fixation, and the spring bolts provide a certain amount of deformation for the connection between the spherical flange and the exhaust flange, further reducing the vibration transmission while ensuring the sealing connection effect.

[0016] 2. The catalytic converter and the engine are assembled with over-brackets. Among them, the long hole one and the long hole two are in an enlarged hole structure or a long strip structure. This structure avoids the inability to assemble caused by tolerance accumulation, and at the same time ensures that no deformation failure occurs during the assembly process, reduces stress concentration, and reduces the cracking risk of the bracket and the pipeline caused by engine vibration.

[0017] 3. The catalytic converter and the muffler are connected by a flexible connecting pipe. On the one hand, the force on the catalytic converter itself is reduced. On the other hand, since the structure of the catalytic converter itself becomes shorter and it is disconnected from the muffler, the vibration transmission is reduced, thereby further reducing the problem of fracture of the catalytic converter support and the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a schematic connection diagram of the exhaust manifold and the connecting pipe;

[0020] Figure 3 is a disassembled schematic diagram of the movable connection mechanism;

[0021] Figure 4 is a schematic structural diagram of the engine;

[0022] Figure 5 is a schematic structural diagram of the catalytic converter.

[0023] In the figure, 1. Muffler; 2. Flexible connecting pipe; 3. Engine; 301. Transition bracket one; 302. Assembly hole one; 303. Transition bracket two; 304. Long slot one; 4. Exhaust manifold; 5. Connecting pipe; 6. Catalytic converter; 601. Transition bracket three; 602. Assembly hole two; 603. Transition bracket four; 604. Long slot two; 605. Fixed bracket; 7. Movable connection mechanism; 701. Spherical flange; 702. Spherical gasket; 703. Exhaust flange; 704. Boss; 705. Inner pipe; 706. Mounting hole; 707. Transition pipe; 8. Spring bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] The orientation terms involved in the paragraphs for detailed description are only for the convenience of those skilled in the art to understand the technical solutions described in this application according to the visual orientation shown in the accompanying drawings. Unless otherwise clearly specified and limited, the terms "set", "installed", "connected", etc. shall be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Such as Figures 1 to 5As shown, the connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and pipeline includes an engine 3 and a catalytic converter 6. One end of the catalytic converter 6 is provided with an exhaust manifold 4, and one end of the catalytic converter 6 away from the exhaust manifold 4 is provided with a muffler 1. The exhaust manifold 4 and the catalytic converter 6 are connected by a connecting pipe 5 and a movable connection mechanism 7. The movable connection mechanism 7 changes the rigid connection between the exhaust manifold 4 and the catalytic converter 6 into an active connection between multiple independent components. On the one hand, it increases the assembly tolerance and reduces the assembly difficulty; on the other hand, it reduces the cracking risk of the exhaust manifold, catalytic converter pipeline or bracket caused by engine vibration.

[0027] Specifically, one end of the connecting pipe 5 is fixedly connected to the catalytic converter 6 in a sealed manner. The movable connection mechanism 7 includes a spherical flange 701 and an exhaust flange 703. The spherical end of the spherical flange 701 is fixedly connected with an overpipe 707, and the overpipe 707 is fixedly connected to the connecting pipe 5 in a sealed manner. The exhaust flange 703 is fixedly connected to the exhaust manifold 4 in a sealed manner. A spherical gasket 702 is arranged inside the spherical flange 701, and the spherical flange 701 and the exhaust flange 703 are fixedly connected by a spring bolt 8. The exhaust manifold 4 and the catalytic converter 6 are connected by the spherical flange 701, and a spherical gasket 702 is installed between the two connecting flanges, enabling the whole catalytic converter 6 to rotate around the spherical gasket 702. On the one hand, it eliminates the assembly error; on the other hand, the connection between the exhaust manifold 4 and the catalytic converter 6 becomes a flexible connection, which can reduce the transmission of engine vibration; the spring bolt 8 provides a certain amount of deformation for the connection between the spherical flange 701 and the exhaust flange 703, further reducing the vibration transmission on the basis of ensuring the sealing connection effect.

[0028] As Figure 3 shown, a convex platform 704 for closely fitting with the inner end face of the spherical gasket 702 is arranged on the side of the exhaust flange 703 away from the exhaust manifold 4. The protruding height of the convex platform 704 is preferably 3 mm. The convex platform 704 ensures the sealing between the spherical gasket 702 and the exhaust flange 703. An inner pipe 705 communicating with the exhaust manifold 4 is arranged on the convex platform 704, and the inner pipe 705 extends into the spherical gasket 702.

[0029] As Figure 2 and Figure 3 shown, two groups of corresponding mounting holes 706 are opened on the spherical flange 701 and the exhaust flange 703. The spring bolt 8 passes through two corresponding mounting holes 706 and fixedly connects the spherical flange 701 and the exhaust flange 703. The spring bolt 8 pre-tightens the two flanges through its own spring and provides a certain elastic space during the assembly process of the two flanges, while ensuring that they are always effectively connected.

[0030] As Figure 4 and Figure 5As shown in the figure, an over-bracket one 301 and an over-bracket two 303 are fixedly connected to the engine 3. An assembly hole one 302 is provided on the over-bracket one 301, and a long hole one 304 is provided on the over-bracket two 303. A over-bracket four 603 that cooperates with the over-bracket one 301 and a over-bracket three 601 that cooperates with the over-bracket two 303 are fixedly connected to the catalytic converter 6. Among them, the over-bracket three 601 is welded to the catalytic converter 6, the over-bracket four 603 and the fixed bracket 605 are fixedly connected by assembly, the fixed bracket 605 is welded to the catalytic converter 6, a long hole two 604 that cooperates with the assembly hole one 302 is provided on the over-bracket four 603, and an assembly hole two 602 that cooperates with the long hole one 304 is provided on the over-bracket three 601. The long hole one 304 and the long hole two 604 are of an enlarged hole structure or a long strip structure. The long holes reduce the assembly difficulty. The over-bracket one 301 and the over-bracket four 603, and the over-bracket two 303 and the over-bracket three 601 are respectively fixedly connected by bolts. By connecting through the over-brackets, the tolerance range during the assembly process is increased, preventing the engine 3 and the catalytic converter 6 from being unable to be assembled due to tolerance accumulation. At the same time, it is ensured that no deformation failure occurs during the assembly process, and stress concentration is reduced.

[0031] A flexible connection pipe 2 is provided between the muffler 1 and the catalytic converter 6. The two ends of the flexible connection pipe 2 are respectively fixedly connected to the pipes of the muffler 1 and the catalytic converter 6. The flexible connection pipe 2 is a metal bellows or a metal hose. By using the flexible connection method to disconnect the catalytic converter 6 and the muffler 1, on the one hand, the force on the catalytic converter 6 itself is reduced, and on the other hand, because the structure of the catalytic converter 6 itself becomes shorter and is disconnected from the muffler 1, the vibration transmission is reduced, thereby further reducing the risk of fracture of the catalytic converter 6 bracket and pipeline.

[0032] When installing the present utility model, the over-bracket one 301 and the over-bracket four 603 are pressed tightly, the bolts sequentially pass through the gasket, the long hole two 604 and the assembly hole one 302, and are tightened and fixed by nuts. The fixing method of the over-bracket two 303 and the over-bracket three 601 is the same as above, and the installation and fixation of the engine 3 and the catalytic converter 6 are completed.

[0033] When installing the connecting pipe 5 and the exhaust manifold 4, the spherical gasket 702 is placed in the spherical flange 701, and the outer spherical wall of the spherical gasket 702 fits with the inner wall of the spherical flange 701. The exhaust flange 703 and the flange surface of the spherical flange 701 are opposite to each other, and the corresponding installation holes 706 are aligned. Finally, it can be fixed by the spring bolt 8 passing through two corresponding installation holes 706. Since the spherical flange 701 can move slightly around the spherical gasket 702, the assembly process of the spring bolt 8 is more convenient, greatly improving the assembly efficiency.

[0034] Finally, although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A connecting structure for eliminating the risk of breakage of the catalytic converter connecting bracket and the pipeline, comprising an engine (3) and a catalytic converter (6), one end of the catalytic converter (6) is provided with an exhaust manifold (4), and it is characterized in that: The exhaust manifold (4) is connected to the catalytic converter (6) through a connecting pipe (5) and a movable connection mechanism (7). One end of the connecting pipe (5) is fixedly connected to the catalytic converter (6). The movable connection mechanism (7) includes a spherical flange (701) and an exhaust flange (703). An extension pipe (707) is fixedly connected to the spherical end of the spherical flange (701). The extension pipe (707) is hermetically and fixedly connected to the connecting pipe (5). The exhaust flange (703) is hermetically and fixedly connected to the exhaust manifold (4). A spherical gasket (702) is provided inside the spherical flange (701). The spherical flange (701) and the exhaust flange (703) are fixedly connected by a spring bolt (8).

2. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and pipeline according to claim 1, characterized in that: A boss (704) for tightly fitting with the inner end face of the spherical gasket (702) is provided on the side of the exhaust flange (703) away from the exhaust manifold (4). An inner pipe (705) communicating with the exhaust manifold (4) is provided on the boss (704). The inner pipe (705) extends into the spherical gasket (702).

3. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and the pipeline according to claim 2, characterized in that: At least two sets of corresponding mounting holes (706) are formed on both the spherical flange (701) and the exhaust flange (703). The spring bolt (8) passes through the mounting holes (706) and is fixedly connected.

4. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and pipeline according to claim 1, wherein: An extension bracket one (301) and an extension bracket two (303) are fixedly connected to the engine (3). An assembly hole one (302) is formed on the extension bracket one (301), and a long slot one (304) is formed on the extension bracket two (303). An extension bracket four (603) matching with the extension bracket one (301) and an extension bracket three (601) matching with the extension bracket two (303) are fixedly connected to the catalytic converter (6). A long slot two (604) matching with the assembly hole one (302) is formed on the extension bracket four (603), and an assembly hole two (602) matching with the long slot one (304) is formed on the extension bracket three (601).

5. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and the pipeline according to claim 4, characterized in that: The long slot one (304) and the long slot two (604) are of an enlarged hole structure or a long strip structure.

6. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and the pipeline according to claim 5, characterized in that: The extension bracket one (301) and the extension bracket four (603), and the extension bracket two (303) and the extension bracket three (601) are respectively fixedly connected by bolts.

7. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and the pipeline according to any one of claims 1 to 6, characterized in that: A muffler (1) is provided at one end of the catalytic converter (6) away from the exhaust manifold (4). A flexible connecting pipe (2) is provided between the muffler (1) and the catalytic converter (6). Both ends of the flexible connecting pipe (2) are fixedly connected to the pipes of the muffler (1) and the catalytic converter (6).

8. The connection structure for eliminating the risk of breakage of the catalytic converter connection bracket and the pipeline according to claim 7, characterized in that: The flexible connecting pipe (2) is a metal bellows or a metal hose.

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