Air-air intercooling system applied to two-busy-end hydrostatic vehicle model

Abstract

The utility model provides an air-air intercooling system applied to two-end-busy hydrostatic vehicle models, and relates to the technical field of heat management of two-end-busy machines. Comprising a first air-air intercooling air inlet rubber pipe, a second air-air intercooling air inlet rubber pipe, a first air-air intercooling air inlet steel pipe and a second air-air intercooling air inlet steel pipe. The first air-air intercooling air inlet rubber pipe is connected with an air outlet of a turbocharger of the two-end-busy hydrostatic vehicle type, then sequentially connected with the first air-air intercooling air inlet steel pipe and the second air-air intercooling air inlet steel pipe and finally connected with the second air-air intercooling air inlet rubber pipe, and the second air-air intercooling air inlet rubber pipe is connected with an air inlet of the water-cooling composite radiator; the air-air intercooling air outlet pipeline comprises an air-air intercooling air outlet steel pipe; one end of the air-air intercooling air outlet steel pipe is connected with an air outlet of the water-cooling composite radiator, and the other end is connected with an air inlet of an engine of the two-end hydrostatic vehicle type. The problems that heat in a two-end-busy static hydraulic vehicle is difficult to dissipate, and the requirement for the air inlet temperature of an engine is stricter are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the thermal management technical field of two busy machines, especially relates to an air-to-air intercooler system applied to two busy hydrostatic vehicles. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Two busy machines refer to those multifunctional engineering machines that can perform multiple tasks, such as loaders and excavators. One of the notable features of two busy machines is their compact structure, which maximizes space utilization in design to integrate more functional modules within a limited space, thereby achieving the effect of one machine serving multiple purposes. Two busy hydrostatic refers to the hydraulic transmission technology applied in two busy machines, which can provide more precise and smooth power output, improving work efficiency and operational comfort. However, the design of two busy hydrostatic vehicles also presents some challenges, especially in terms of thermal management, such as:

[0004] Due to the narrow space between modules, the heat generated within the machine body is difficult to effectively dissipate to the external environment. During high-intensity work, the engine, hydraulic system, and other critical components will generate a large amount of heat, which, if not dissipated in time, will cause the equipment to overheat, affecting performance and lifespan, and even possibly causing malfunctions and safety accidents. Therefore, for two busy vehicles, how to effectively manage and dissipate heat becomes an important technical problem.

[0005] Two busy hydrostatic technology has more stringent requirements for engine intake temperature. When the engine is working, the intake temperature directly affects its performance, and high intake temperature will reduce air density, reduce intake volume, and thus affect engine power output and combustion efficiency. In addition, high-temperature intake can also increase the thermal stress of engine components, accelerate wear and tear, and shorten the service life of the engine. Therefore, for two busy machines using hydrostatic technology, an effective cooling system must be equipped to ensure that the engine works at an appropriate temperature, maintaining optimal performance and reliability. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an air-to-air intercooler system applied to two busy hydrostatic vehicles, which cools high-temperature and high-pressure air after the turbocharger, solving the problem of difficulty in dissipating heat within two busy hydrostatic vehicles and the more stringent requirements for engine intake temperature.

[0007] The utility model adopts the following scheme:

[0008] An air-air intercooling system applied to a two-head busy static hydraulic vehicle, comprising an air-air intercooling air inlet pipeline, an air-air intercooling air outlet pipeline, a water intercooling composite radiator and a hydraulic oil radiator; the water intercooling composite radiator is adjacent to the hydraulic oil radiator;

[0009] The air-air intercooling air inlet pipeline comprises a first air-air intercooling air inlet rubber tube, a second air-air intercooling air inlet rubber tube, a first air-air intercooling air inlet steel tube and a second air-air intercooling air inlet steel tube; the first air-air intercooling air inlet rubber tube is connected with a turbocharger air outlet of the two-head busy static hydraulic vehicle, and then sequentially connected with the first air-air intercooling air inlet steel tube and the second air-air intercooling air inlet steel tube, and finally connected with the second air-air intercooling air inlet rubber tube, which is connected with an air inlet of the water intercooling composite radiator;

[0010] The air-air intercooling air outlet pipeline comprises an air-air intercooling air outlet steel tube; one end of the air-air intercooling air outlet steel tube is connected with an air outlet of the water intercooling composite radiator, and the other end is connected with an engine air inlet of the two-head busy static hydraulic vehicle.

[0011] Further, the first air-air intercooling air inlet rubber tube is in a "U" shape, and the second air-air intercooling air inlet rubber tube is in an "L" shape.

[0012] Further, the first air-air intercooling air inlet steel tube, the second air-air intercooling air inlet steel tube and the air-air intercooling air outlet steel tube are all stainless steel tubes with multiple bends.

[0013] Further, the diameters of the first air-air intercooling air inlet rubber tube and the second air-air intercooling air inlet rubber tube are greater than the diameters of the first air-air intercooling air inlet steel tube and the second air-air intercooling air inlet steel tube; the connection mode is that the first air-air intercooling air inlet rubber tube covers the first air-air intercooling air inlet steel tube, the second air-air intercooling air inlet rubber tube covers the second air-air intercooling air inlet steel tube, and both are fixed by a clamp.

[0014] Further, the air-air intercooling air outlet pipeline penetrates between a muffler and an air cleaner of the two-head busy static hydraulic vehicle.

[0015] Further, the first air-air intercooling air inlet steel tube and the second air-air intercooling air inlet steel tube, the air-air intercooling air outlet steel tube and the air outlet of the water intercooling composite radiator, and the air-air intercooling air outlet steel tube and the engine air inlet are all connected by a connecting pipe.

[0016] Further, the connecting pipe is a silicon rubber pipe made of silicon rubber material.

[0017] Further, the air-air intercooling air inlet pipeline is fixed by multiple supports and U-shaped pipe clamps; one side of the support is fixed with both ends of the U-shaped pipe clamp by a bolt, and the other side is provided with at least one fixing point and is fixed with a vehicle frame by a bolt; the support comprises an L-shaped support, a small L-shaped support and a T-shaped support.

[0018] Further, the air-to-air cooling out-gas pipeline is fixed by a special-shaped support; the special-shaped support is an integrated plate-shaped support composed of a vertical part, an inclined part and a horizontal part; wherein the vertical part is fixed with the two ends of the plurality of U-shaped pipe clamps by bolts, and is used for fixing the air-to-air cooling out-gas pipeline.

[0019] Further, a plurality of fixing points are arranged at four corners of the horizontal part of the special-shaped support, and the special-shaped support is fixed below the silencer by bolts.

[0020] The beneficial effects of the utility model are as follows:

[0021] The utility model discloses the compactness of the interior space of two busy static hydraulic vehicle type is considered, and the air-to-air cooling inlet pipeline and air-to-air cooling outlet pipeline layout are carefully designed, including certain flexible silicon rubber pipe and stainless steel pipe bent at multiple places, so that the whole air-to-air cooling system can realize more compact arrangement in limited space, and the space utilization of the interior of the vehicle type is improved. The high-temperature and high-pressure air after the turbocharger is effectively cooled by the water cooling composite radiator, which is crucial for improving the overall performance and reliability of the two busy static hydraulic vehicle type, and solves the problems that heat is difficult to dissipate in the two busy static hydraulic vehicle type and the engine inlet temperature requirement is more stringent.

[0022] The utility model discloses the use of L type support, small L type support, T type support and special-shaped support, and the pipeline can be more easily installed at a specific position of the vehicle, while maintaining the stability of the structure. The U-shaped pipe clamp provides a quick fixing and adjusting method for the air-to-air cooling inlet pipeline, ensuring the stability and vibration resistance of the pipeline. This design makes the whole air-to-air cooling system more compact, improves the space utilization, especially in the case of small space reserved for the radiator at the front end of the cab, while making the pipeline easier to disassemble when maintenance or replacement is required, reducing maintenance time and cost, and improving the convenience of maintenance.

[0023] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become apparent from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of the utility model form a part thereof, serve to provide further understanding of the utility model, and together with the description of the exemplary embodiments of the utility model, explain the utility model, and do not constitute an improper limitation to the utility model.

[0025] Figure 1 is the oblique view of the air-to-air cooling system in the utility model embodiment,

[0026] Figure 2 is the front view of the air-to-air cooling system in the utility model embodiment,

[0027] Figure 3 is the rear view of the air-air intercooling system in the embodiment of the utility model;

[0028] Figure 4 is the rear view of the air-air intercooling system in the embodiment of the utility model;

[0029] Figure 5 is the left view of the air-air intercooling system in the embodiment of the utility model;

[0030] Figure 6 is the right view of the air-air intercooling system in the embodiment of the utility model.

[0031] 1, water intercooling composite radiator, 2, hydraulic oil radiator, 3, first air-air intercooling air inlet rubber pipe, 4, second air-air intercooling air inlet rubber pipe, 5, first air-air intercooling air inlet steel pipe, 6, second air-air intercooling air inlet steel pipe, 7, air-air intercooling air outlet steel pipe, 8, connecting pipe, 9, L-shaped support, 10, small L-shaped support, 11, T-shaped support, 12, special-shaped support, 13, U-shaped pipe clamp. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. It should be pointed out that the following detailed description is exemplary and aims to provide further description of the utility model. Unless otherwise specified, all technical and scientific terms used in this document have the same meaning as that generally understood by ordinary technical personnel in the technical field to which the utility model belongs.

[0033] It should be noted that the terms used herein are only for describing the specific embodiments and are not intended to limit the exemplary embodiments according to the utility model.

[0034] In the case of no conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0035] Embodiment one

[0036] The embodiment provides an air-air intercooling system applied to a two-head busy hydrostatic vehicle, as shown in Figure 1 The air-air intercooling air inlet pipeline, the air-air intercooling air outlet pipeline, the water intercooling composite radiator 1 and the hydraulic oil radiator 2, and the water intercooling composite radiator 1 is adjacent to the hydraulic oil radiator 2.

[0037] Air-air intercooling air inlet pipeline connection mode:

[0038] The air-air intercooling air inlet pipeline comprises a first air-air intercooling air hose 3, a second air-air intercooling air hose 4, a first air-air intercooling air steel pipe 5, and a second air-air intercooling air steel pipe 6. The first air-air intercooling air hose 3 is connected with the turbocharger air outlet of the two-front busy hydraulic vehicle, and then connected with the first air-air intercooling air steel pipe 5 and the second air-air intercooling air steel pipe 6 in sequence, and finally connected with the second air-air intercooling air hose 4. The second air-air intercooling air hose 4 is connected with the water intercooling composite radiator 1 air inlet.

[0039] The water intercooling composite radiator 1 is a special radiator, which is composed of two core bodies of water and air. The two core bodies are channels for cooling liquid and air. The two core bodies are welded side by side, but their flow paths are independent of each other, that is, the cooling liquid and the air will not mix inside the radiator, and they will exchange heat through their own channels.

[0040] In this embodiment, the connection mode is specifically: turbocharger air outlet-first air-air intercooling air hose 3-first air-air intercooling air steel pipe 5-second air-air intercooling air steel pipe 6-second air-air intercooling air hose 4-water intercooling composite radiator 1 air inlet.

[0041] The sequential connection mode of the hose, the steel pipe, and the hose constitutes the sectional design of the air-air intercooling air inlet pipeline, and the pipeline can more effectively utilize the limited internal space of the two-front busy vehicle to realize effective pipeline layout in the compact space inside the vehicle, and is convenient for installation and maintenance.

[0042] Among them, the first air-air intercooling air hose 3 is in the shape of "U", and the second air-air intercooling air hose 4 is in the shape of "L". The diameters of the first air-air intercooling air hose 3 and the second air-air intercooling air hose 4 are greater than the diameters of the first air-air intercooling air steel pipe 5 and the second air-air intercooling air steel pipe 6. The first air-air intercooling air hose 3 covers the first air-air intercooling air steel pipe 5, and the second air-air intercooling air hose 4 covers the second air-air intercooling air steel pipe 6, which are fixed by clamps.

[0043] The first air-air intercooling air steel pipe 5 and the second air-air intercooling air steel pipe 6 are connected by a connecting pipe 8. In this embodiment, the connecting pipe 8 is a small section of straight section of silicone rubber pipe, which can cover the two end steel pipes and be fixed by a clamp.

[0044] The first air-air intercooling air steel pipe 5 and the second air-air intercooling air steel pipe 6 are disconnected in the middle and connected by a small section of straight section of silicone rubber pipe, which is to shorten the length of the single steel pipe, reduce the difficulty of steel pipe production process, and use silicone rubber material to make the pipeline have high temperature resistance.

[0045] The "U" shape design of the first air-air air-cooled air inlet rubber pipe 3 and the "L" shape design of the second air-air air-cooled air inlet rubber pipe 4 can optimize the air flow path, reduce resistance, and improve air flow efficiency. The diameters of the first air-air air-cooled air inlet rubber pipe 3 and the second air-air air-cooled air inlet rubber pipe 4 are larger than those of the first air-air air-cooled air inlet steel pipe 5 and the second air-air air-cooled air inlet steel pipe 6, which ensures the close fit between the rubber pipe and the steel pipe, effectively prevents air leakage, and ensures the normal operation of the air-air air-cooled system. In addition, the diameter difference design between the rubber pipe and the steel pipe, as well as the silicone rubber pipe connected to the turbocharger air outlet and the water-cooled composite radiator 1 air inlet, provides a transition between the two steel pipes, making the entire air inlet pipeline have better elasticity and flexibility, which can better adapt to various complex working conditions during vehicle operation, prolonging the service life. At the same time, this design can also reduce the deformation of the pipeline caused by temperature changes to some extent, improving the stability and reliability of the system.

[0046] Air-air air-cooled air outlet pipeline connection mode:

[0047] The air-air air-cooled air outlet pipeline includes an air-air air-cooled air outlet steel pipe 7. One end of the air-air air-cooled air outlet steel pipe 7 is connected to the air outlet of the water-cooled composite radiator 1, and the other end is connected to the engine air inlet of the two-head busy hydraulic vehicle.

[0048] In this embodiment, the connection mode is specifically: water-cooled composite radiator 1 air outlet-air-air air-cooled air outlet steel pipe 7-engine air inlet.

[0049] Similar to the air-air air-cooled air inlet pipeline, the two ends of the air-air air-cooled air outlet steel pipe 7, i.e. between the air-air air-cooled air outlet steel pipe 7 and the air outlet of the water-cooled composite radiator 1, and between the air-air air-cooled air outlet steel pipe 7 and the engine air inlet, are connected by a connecting pipe 8 and fixed by a clamp.

[0050] In this embodiment, the connecting pipe 8 is a small straight section of silicone rubber pipe. In the air-air air-cooled air outlet pipeline, a straight section of silicone rubber pipe is connected to the air outlet of the water-cooled composite radiator 1, then a long stainless steel pipe is connected, then a straight section of silicone rubber pipe is connected, and then the engine air inlet is connected. This ensures the sealing and stability of the connection, and through the elasticity of the silicone rubber pipe, the vibration resistance of the entire air outlet pipeline is further enhanced, which not only guarantees the strength of the pipeline, but also takes into account the flexibility, so that the entire air-air air-cooled air outlet pipeline can better adapt to various working conditions during the operation of the two-head busy vehicle, improving the overall performance of the system.

[0051] Air-air air-cooled system and two-head busy hydraulic vehicle adaptation:

[0052] In this embodiment, the air-air intercooling exhaust air pipe runs through the muffler and air filter of the two-head busy hydraulic vehicle (not shown in the figure). This layout effectively utilizes the internal space of the two-head busy vehicle, reduces the occupied area of the pipe, and enables the air-air intercooling exhaust air pipe to effectively deliver air to the engine without affecting other components.

[0053] The first air-air intercooling intake steel pipe 5, the second air-air intercooling intake steel pipe 6, and the air-air intercooling exhaust steel pipe 7 are all stainless steel pipes with multiple bends. In this embodiment, the first air-air intercooling intake steel pipe 5 has two bends, the second air-air intercooling intake steel pipe 6 has three bends, and the air-air intercooling exhaust steel pipe 7 has five bends.

[0054] This bending design not only optimizes the space layout, making the entire air-air intercooling system more compact, but also improves the strength and rigidity of the steel pipe, effectively resisting the vibration and impact caused by high-pressure air flow. The design of multiple bends in the stainless steel pipe allows the pipe to more flexibly adapt to the complex structure inside the two-head busy hydraulic vehicle, achieving a more compact pipeline layout in limited space while ensuring smooth and efficient air flow. By precisely designing the angles and positions of the bends, the air flow path can be further optimized, reducing unnecessary bends and resistance without affecting other components in the vehicle.

[0055] The air-air intercooling intake pipe is fixed by multiple supports and U-shaped pipe clamps 13. One side of the support is fixed to both ends of the U-shaped pipe clamp 13 by bolts, and the other side has at least one fixed point fixed to the vehicle frame by bolts. The support includes L-shaped supports 9, small L-shaped supports 10, and T-shaped supports 11. The support allows the pipe to be easily installed in a specific position of the vehicle, while the U-shaped pipe clamp 13 provides a quick and adjustable way to fix the air-air intercooling intake pipe, ensuring its stability and anti-vibration capability.

[0056] The air-air intercooling exhaust pipe is fixed by a special-shaped support 12. The special-shaped support 12 is an integrated plate-shaped support composed of a vertical part, an inclined part, and a horizontal part. The vertical part is fixed to both ends of multiple U-shaped pipe clamps 13 by bolts to fix the air-air intercooling exhaust pipe. The horizontal part of the special-shaped support 12 has multiple fixed points at the four corners, which are fixed to the bottom of the muffler by bolts. The design of the special-shaped support 12 allows the air-air intercooling exhaust pipe to adapt to the complex space layout inside the vehicle, allowing the pipe to be more effectively arranged in limited space while maintaining the stability of the structure. By being fixed to the bottom of the muffler by bolts, the fixing strength of the pipe is improved, and the displacement of the pipe during operation is reduced.

[0057] At the same time, the design of the L-shaped bracket 9, the small L-shaped bracket 10, the T-shaped bracket 11, the special-shaped bracket 12 and the U-shaped pipe clamp 13 makes the pipeline easier to disassemble when maintenance or replacement is required, reduces maintenance time and cost, and improves the convenience of maintenance.

[0058] In this embodiment, the air flow mode of the air-air intercooling system is as follows:

[0059] S1: Intake stage:

[0060] The air first flows out from the turbocharger outlet of the two-head busy hydraulic vehicle, passes through the first air-air intercooling intake rubber pipe 3, which is designed in a "U" shape to help optimize the air flow path and reduce resistance, then flows through the first air-air intercooling intake steel pipe 5, and then flows into the second air-air intercooling intake steel pipe 6 through the connecting pipe 8, a small section of silicone rubber pipe made of silicone rubber material. The air continues to flow through the second air-air intercooling intake steel pipe 6, which is a precisely designed stainless steel pipe with multiple bends, optimizing the spatial layout and improving the strength and rigidity of the steel pipe. Finally, the air passes through the second air-air intercooling intake rubber pipe 4, which is designed in an "L" shape and connected to the air inlet of the water-air intercooled radiator 1.

[0061] S2: Heat exchange stage:

[0062] In the water-air intercooled radiator 1, the air and the coolant exchange heat through their respective channels, and the air is cooled.

[0063] S3: Exhaust stage:

[0064] The air after heat exchange flows out from the air outlet of the water-air intercooled radiator 1, then flows into the air-air intercooling exhaust steel pipe 7 through the connecting pipe 8, a small section of silicone rubber pipe made of silicone rubber material, and then flows into the engine air inlet through the connecting pipe 8, a small section of silicone rubber pipe made of silicone rubber material.

[0065] By optimizing the air flow path, it is ensured that the high-temperature and high-pressure air can be rapidly and effectively cooled after passing through the turbocharger. The connection of pipes made of different materials and the precisely designed bent steel pipes further improve the durability and reliability of the system. The special working environment of the two-head busy hydraulic vehicle is fully considered, solving the problem of difficult heat dissipation in the two-head busy hydraulic vehicle and the more stringent requirements for engine intake temperature, meeting the requirements of emission regulations, and improving the engine power performance and economy.

[0066] The utility model discloses above although the specific embodiment of the utility model has been described in conjunction with the drawing, is not the limit to the protection scope of the utility model, and the person skilled in the art should understand that on the basis of the technical scheme of the utility model, various modifications or deformation that the person skilled in the art can make without paying creative labour are still within the protection scope of the utility model.

Claims

1. An air-to-air intercooling system for a dual-headed, static hydraulic vehicle, characterized in that, It includes an air-to-air intercooled intake pipe, an air-to-air intercooled exhaust pipe, a water-cooled composite radiator, and a hydraulic oil radiator; the water-cooled composite radiator is located next to the hydraulic oil radiator. The air-cooled intake pipeline includes a first air-cooled intake hose, a second air-cooled intake hose, a first air-cooled intake steel pipe, and a second air-cooled intake steel pipe; the first air-cooled intake hose is connected to the turbocharger outlet of the two-end hydraulic vehicle, then connected to the first air-cooled intake steel pipe and the second air-cooled intake steel pipe in sequence, and finally connected to the second air-cooled intake hose, which is connected to the air inlet of the water-cooled composite radiator; The air-to-air cooling outlet pipeline includes an air-to-air cooling outlet steel pipe; one end of the air-to-air cooling outlet steel pipe is connected to the outlet of the water-cooled composite radiator, and the other end is connected to the engine air inlet of the two-headed static hydraulic vehicle.

2. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 1, characterized in that, The first air-cooled air intake hose is U-shaped, and the second air-cooled air intake hose is L-shaped.

3. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 1, characterized in that, The first air-cooled air intake pipe, the second air-cooled air intake pipe, and the air-cooled air outlet pipe are all stainless steel pipes with multiple bends.

4. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 1, characterized in that, The diameters of the first air-cooled air intake hose and the second air-cooled air intake hose are larger than the diameters of the first air-cooled air intake steel pipe and the second air-cooled air intake steel pipe; the connection method is as follows: the first air-cooled air intake hose is sleeved over the first air-cooled air intake steel pipe, and the second air-cooled air intake hose is sleeved over the second air-cooled air intake steel pipe, both of which are fixed with clamps.

5. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 1, characterized in that, The air-cooled exhaust pipe runs between the muffler and air filter of both busy hydraulic vehicles.

6. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 1, characterized in that, The first air-cooled intake steel pipe and the second air-cooled intake steel pipe, the air-cooled exhaust steel pipe and the outlet of the water-cooled composite radiator, and the air-cooled exhaust steel pipe and the engine intake are all connected by connecting pipes.

7. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 6, characterized in that, The connecting pipe is a silicone rubber tube made of silicone rubber.

8. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 1, characterized in that, The air-cooled intake pipe is fixed by multiple brackets and U-shaped pipe clamps; one side of the bracket is fixed to both ends of the U-shaped pipe clamp by bolts, and the other side is provided with at least one fixing point, which is fixed to the vehicle frame by bolts; the bracket includes L-shaped brackets, small L-shaped brackets and T-shaped brackets.

9. The air-to-air intercooling system for a dual-headed, static hydraulic vehicle as described in claim 1, characterized in that, The air-cooled air outlet pipe is fixed to the irregularly shaped bracket; the irregularly shaped bracket is an integrated plate-shaped bracket composed of a vertical part, an inclined part and a horizontal part; wherein, the vertical part is fixed to both ends of multiple U-shaped pipe clamps by bolts, which is used to fix the air-cooled air outlet pipe.

10. The air-to-air intercooling system for a dual-headed, stationary hydraulic vehicle as described in claim 9, characterized in that, The horizontal portion of the irregularly shaped bracket has multiple fixing points at its four corners, which are fixed to the bottom of the muffler by bolts.

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