Engine muffler structure

Abstract

The utility model relates to the technical field of engine, especially a kind of engine silencer structure, including the silencer shell cover being set on the upper end of box, the upper end of silencer shell cover, box and the left cover piece, right cover piece, front cover piece and rear cover piece on box form upper heat dissipation cavity;Upper heat dissipation cavity is communicated with left cover piece inside, right cover piece inside and rear cover piece inside;The lower side surface of silencer shell cover is equipped with communicating port and makes silencer shell cover inside and upper heat dissipation cavity communicate;And be provided with mounting bracket in silencer shell cover, silencer is installed on mounting bracket, and mounting fixed end that can be passed through the mouth of silencer shell cover and be connected and fixed on the box is set on mounting bracket.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to an engine muffler structure. Background Technology

[0002] Air-cooled gasoline engines typically have cooling ducts to reduce the ineffective heat generated during power operation, thereby improving engine performance and extending its service life. Conventional air-cooled engines, on the other hand, usually use a single-impeller cooling duct to dissipate heat, which results in incomplete heat dissipation from the engine block and low cooling efficiency.

[0003] Therefore, the inventors designed a dual-impeller cooling structure for an engine. This structure involves placing a front impeller and a rear impeller at the front and rear of the engine, respectively, and then placing front and rear covers corresponding to the front and rear impellers. Additionally, front and right covers are placed on the left and right sides of the engine housing, respectively, and upper covers and bottom covers are placed on the upper and lower surfaces of the housing. This achieves comprehensive heat dissipation for the housing and improves cooling efficiency. However, this design still has the following problems: the placement of the upper cover occupies the original muffler installation location, making muffler installation inconvenient. Furthermore, it cannot specifically target the muffler for heat dissipation. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by this utility model is how to design an engine muffler structure with a simpler and more reasonable layout, more stable and reliable installation, and better heat dissipation of the muffler.

[0005] To achieve the above objectives, this utility model provides an engine muffler structure, including a muffler cover disposed on the upper end of a housing, forming an upper heat dissipation cavity between the muffler cover, the upper end of the housing, and the left, right, front, and rear covers on the housing; the upper heat dissipation cavity communicates with the interiors of the left, right, and rear covers; a connecting opening is provided on the lower surface of the muffler cover, allowing the interior of the muffler cover to communicate with the upper heat dissipation cavity; a mounting bracket is provided inside the muffler cover, on which a muffler is mounted, and the mounting bracket is provided with a mounting and fixing end that can pass through an opening on the muffler cover to the outside and is connected and fixed to the housing; a matching opening is provided on the muffler cover at a position opposite to the exhaust pipe on the muffler to allow the outer end of the exhaust pipe to extend to the outside.

[0006] In this way, the upper cover is set as a muffler housing, and a mounting bracket is arranged inside it. The muffler is then mounted on the mounting bracket. The muffler housing serves both as an upper cover and as a mounting bracket for the muffler, making the installation of the muffler more convenient. The mounting bracket also ensures better fixation of the muffler. A gap is created between the muffler and the muffler housing, and a connecting opening and matching aperture are provided on the muffler housing. This allows cool air to enter through the matching aperture and exit through the connecting opening to the outside of the muffler housing, thus providing targeted heat dissipation to the outer surface of the muffler. Furthermore, the mounting bracket ensures a more stable and reliable installation of the muffler.

[0007] As an optimization, the mounting bracket includes a contoured support plate with an overall trapezoidal plate structure at the upper end, allowing the muffler to be arranged on the contoured support plate; one end of the contoured plate is partially bent downward to form a first connecting support block, which is fixed to the housing with screws; the other end of the contoured plate is partially bent downward and then horizontally outward to form a second connecting support block, which is fixed to the housing with screws; the first connecting support block and the second connecting support block form the mounting and fixing end.

[0008] In this way, the structural design of the mounting bracket is simpler and more reasonable, which can better support the installation of the muffler and make it more stable and reliable to be fixed to the housing.

[0009] As an optimization, fixed supports are provided on the box body corresponding to the first and second connecting supports respectively.

[0010] In this way, by setting fixed blocks on the housing, it is easier to connect and fix it with the mounting bracket.

[0011] As an optimization, each of the first and second connecting blocks is provided with mounting holes for arranging connecting screws, such that the corresponding connection of each connecting screw is fixed in the threaded hole of the fixed block.

[0012] In this way, by setting mounting holes and arranging connecting screws in the first and second connecting blocks, tolerances can be better compensated, and installation can be made more convenient. After installation, disassembly and assembly are also more convenient.

[0013] As an optimization, the central part of the conformal support plate is provided with a hollow hole that is set in a trapezoidal structure.

[0014] In this way, by setting perforations on the conformal support plate, the contact with the outer surface of the muffler can be reduced, which is more conducive to heat dissipation.

[0015] As an optimization, the matching opening is located on the front right side of the muffler housing.

[0016] This makes the setting of the matching opening position more reasonable.

[0017] As an optimization, the muffler housing includes a lower housing and an upper housing mounted and fixed above the lower housing.

[0018] This makes the design of the muffler housing simpler and easier to manufacture.

[0019] As an optimization, the upper shell includes an outer layer, a middle layer, and an inner layer; the lower shell includes an outer layer and an inner layer; and the middle layer of the upper shell is made of heat-insulating cotton.

[0020] This helps to better prevent the muffler housing from overheating and causing burns.

[0021] As an optimization, the outer contour of the muffler housing in the horizontal direction is matched with the outer contour of the upper surface of the housing.

[0022] This maximizes the size of the muffler housing, thereby maximizing the size of the internal muffler and resulting in better noise reduction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a dual-impeller cooling structure for an engine that uses the structure of this utility model.

[0024] Figure 2 yes Figure 1 A schematic diagram with some components omitted.

[0025] Figure 3 yes Figure 2 A schematic diagram with some components omitted.

[0026] Figure 4 yes Figure 1 A schematic diagram after rotating by one angle.

[0027] Figure 5 yes Figure 4 A schematic diagram after rotating by one angle.

[0028] Figure 6 yes Figure 5 A schematic diagram after rotating by one angle.

[0029] Figure 7 yes Figure 6 A schematic diagram with some components omitted.

[0030] Figure 8 yes Figure 1 A schematic diagram of the structure of the box.

[0031] Figure 9 yes Figure 8 A schematic diagram after rotating by one angle.

[0032] Figure 10 yes Figure 9 A schematic diagram after rotating by one angle.

[0033] Figure 11 yes Figure 10 A magnified view of a portion of position A in the diagram.

[0034] Figure 12 yes Figure 1 A schematic diagram of the upper cover part.

[0035] Figure 13 yes Figure 12 A schematic diagram after rotating by one angle.

[0036] Figure 14 yes Figure 12 A schematic diagram of the mounting bracket.

[0037] Figure 15 yes Figure 1 A schematic diagram of the air filter section.

[0038] Figure 16 yes Figure 15 A schematic diagram after rotating by one angle.

[0039] Figure 17 yes Figure 15 A schematic diagram of the inner side. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments of an engine dual-impeller cooling structure using the structure of the present invention. It should be noted that in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 manner, and therefore should not be construed as a limitation of the present invention. The terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] like Figures 1 to 17As shown, an engine dual-impeller cooling structure includes a front impeller 2 located on the front side of a housing 1 and driven by the main shaft on the housing; a front cover 3, which is integrally box-shaped and open on the inside, is installed on the front side of the housing, with the front impeller located inside the front cover and an air inlet 4 on the outside of the front cover; it also includes a rear impeller 5 located on the rear side of the housing and driven by the main shaft on the housing; a rear cover 6, which is integrally flat box-shaped and open on the inside, is installed on the rear side of the housing, with the rear impeller located inside the rear cover; an air outlet 7 is provided between the upper end of the rear cover and the housing; a left cover 8 and a right cover 9 are provided on the left and right sides of the housing, respectively, forming a left cooling cavity and a right cooling cavity between the left cover and the housing, and the front and rear ends of the left and right cooling cavities are respectively connected to the interior of the front cover and the rear cover; a bottom cover 10 is also provided at the bottom of the housing, forming a bottom cooling cavity between the two, and the front and rear ends of the bottom cooling cavity are respectively connected to the interior of the front cover and the rear cover.

[0042] Specifically, an upper cover 11 is provided at the upper end of the housing, and the upper cover forms an upper heat dissipation cavity with the upper end of the housing, as well as the left cover, right cover, front cover and rear cover; and the upper heat dissipation cavity is connected to the interior of the left cover, the interior of the right cover and the interior of the rear cover.

[0043] In this way, when the engine is running, the main shaft on the housing can simultaneously drive the front and rear impellers to rotate. The negative pressure generated by the rotation of the front impeller draws in cold air through the intake. This cold air then flows between the front cover and the front side of the housing, then between the left cover and the left side of the housing, the right cover and the right side of the housing, the lower cover and the lower end of the housing, and the upper end of the housing and the upper cover. Afterward, guided by the rear impeller, it enters the space between the rear side of the housing and the rear cover, and is exhausted to the outside through the exhaust port located between the upper end of the rear cover and the housing. The action of the front and rear impellers increases the cold air circulation speed, allowing more cold air to enter the circulation path and carry away the heat generated by the housing, thus improving heat dissipation efficiency. It also better dissipates heat from various parts of the housing, making heat dissipation more comprehensive. When the cold air flows through the bottom of the housing, it dissipates heat from the bottom of the housing, thereby cooling the engine oil inside.

[0044] In this specific embodiment, an installation cylinder 12 is installed on the outer end of the main shaft on the housing. Corresponding to the installation cylinder, a rotor cover 13 with an overall circular box structure and an open inner end is provided, such that the outer end of the installation cylinder extends into the inside of the rotor cover and is connected and fixed together; the front impeller is installed on the outer end of the rotor cover.

[0045] In this way, by setting up the mounting cylinder and rotor cover, it is easier to install and arrange the front impeller, and it can drive the front impeller to rotate better; secondly, it can also make the space between the front cover and the front side of the box larger, better generate negative pressure and draw in cold air, thereby improving the heat dissipation effect.

[0046] Specifically, four weight-reducing holes 14 are arranged in an array along the circumferential direction at the edge of the outer end face of the rotor cover.

[0047] In this way, the rotor cover has a simpler structural design, the designed weight-reducing holes can reduce weight, and secondly, it is more conducive to the entry of cold air.

[0048] Specifically, the outer end of the mounting cylinder is inserted into the assembly hole in the middle of the outer end face of the rotor cover, and the mounting cylinder has a ring-shaped mounting disc that is attached to the inner bottom surface of the rotor cover.

[0049] This makes the installation and fit between the mounting cylinder and the rotor cover simpler and more reasonable, and the installation more stable and reliable.

[0050] In this specific embodiment, a circular opening is provided in the middle of the outer surface of the front cover to form the air inlet; a starter cover 15 with a circular box structure and an open inner side is provided on the outer side of the front cover and corresponding to the opening, and a plurality of air inlet openings 16 are provided on the outer surface of the starter cover through its thickness direction; a pull plate 17 is provided inside the starter cover, and a starter cup is provided between the pull plate and the rotor cover, with the two ends of the starter cup connected to the rotor cover and the pull plate respectively.

[0051] In this way, by installing the starter cover on the outside of the front cover, it is easier to operate and use, and by setting the starter cup, the pull plate inside the starter cover can be better connected to the rotor cover.

[0052] In this specific embodiment, four outwardly protruding mounting posts 18 are provided on the outer surface of the front cover and at the position corresponding to the edge of the opening, so that the starter cover is fixed to the mounting posts by connecting screws; and an air intake gap 19 is formed between the front cover and the starter cover.

[0053] This creates an air intake gap between the outer side of the cover and the starter shroud, which better facilitates the entry of cooling air.

[0054] In this specific embodiment, a protruding bulge 21 is formed on the right cover, which is opposite to the start drive motor 20 on the housing. Multiple vertically spaced protrusions are provided on the bottom surface of the protruding bulge and are drawn outward. Each of the protrusions has a side air inlet 22 with a long strip structure on its upper side.

[0055] In this way, by setting a protruding bulge on the right cover, with the position of the protruding bulge corresponding to the position of the starter drive motor on the housing, and then setting a protrusion on the protruding bulge and a side air inlet on the protrusion, cold air can enter from the side air inlet, specifically targeting the heat dissipation and cooling of the starter drive motor, thereby better extending its service life.

[0056] In this specific embodiment, the area below the protruding bulge on the right cover is drawn inward to form a recess, and a rectangular opening is provided on the bottom surface of the recess, with a plug 23 provided inside the rectangular opening.

[0057] In this way, rectangular openings are provided and plugs are arranged, allowing the plugs to be installed and removed according to heat dissipation needs, thereby improving the heat dissipation effect.

[0058] In this specific embodiment, the box body includes a bottom plate 24 at the lower end, and an extended bottom plate 25 is formed by horizontally extending forward from the front side of the bottom plate. At the position where the extended bottom plate connects with the bottom plate, a plurality of inclined connection ports 26 are provided, which are arranged through the upper and lower surfaces. The upper end of the connection port communicates with the interior of the front cover, and the lower end of each connection port corresponds to the air duct 27 on the bottom plate. The bottom cover is installed on the bottom plate. At the rear end of the box body, a plurality of air outlet connection ports 28 are also provided, and the two ends of the air outlet connection ports communicate with the bottom heat dissipation cavity and the interior of the rear cover.

[0059] In this way, the bottom of the enclosure is equipped with a bottom plate and an extended bottom plate, and then a bottom cover is installed on the bottom plate, which can better dissipate heat from the bottom of the enclosure, and the structural design is simpler and more reasonable.

[0060] In this specific embodiment, a first connection port 29 is provided at the front end of the right side of the housing, which is used to connect the right heat dissipation cavity and the interior of the front cover; a second connection port 30 is provided at the rear end of the right side of the housing, which is used to connect the right heat dissipation cavity and the interior of the rear cover.

[0061] In this way, by setting the first connection port and the second connection port on the housing, the right heat dissipation cavity and the interior of the front cover can be better connected, as well as the right heat dissipation cavity and the interior of the rear cover can be connected.

[0062] In this specific embodiment, the left cover is spaced out and wrapped around the engine cylinder head 31 on the housing, and the left cover has notches on both the front and rear sides and communicates with the interior of the front and rear covers.

[0063] In this way, the left cover covers the engine cylinder head, enabling targeted heat dissipation of the engine cylinder head on the housing.

[0064] In this specific embodiment, the rear side of the housing is recessed inward to form an installation cavity. A baffle 32 is installed inside the installation cavity and spaced apart from the bottom surface of the installation cavity, and a converging chamber is formed between the baffle and the inner end of the installation cavity. The rear ends of the bottom heat dissipation cavity and the right heat dissipation cavity are respectively connected to the converging chamber. The rear impeller is provided on the outside of the baffle in the installation cavity, and a drive cylinder 33 is installed in the middle of the inner side of the rear impeller, and the drive cylinder passes through the through hole in the center of the baffle and is connected to the main shaft.

[0065] This design simplifies the housing structure, making it easier to install the impeller. Furthermore, a baffle is incorporated, forming a converging chamber between the baffle and the inner end of the mounting cavity. This allows for better collection and centralized discharge of heated air flowing through the housing to the outside.

[0066] Specifically, the front cover, rear cover, left cover, right cover, and bottom cover are all connected and fixed to the housing by connecting screws.

[0067] This makes the structural design simpler and more reasonable, and easier to assemble and disassemble.

[0068] Specifically, lifting rings 34 are installed and fixed on the upper front side and the lower rear side of the box.

[0069] By setting two pull rings, it becomes easier to lift and move the engine.

[0070] Specifically, the left cover includes a cylinder head cover 35 that covers the outside of the cylinder head on the left side of the housing, and a cylinder head cover outer cover 36 installed outside the cylinder head cover.

[0071] In this way, the structural design of the left cover is simpler and more reasonable.

[0072] Specifically, the rear cover includes a rear cover body 37 with an overall flat box structure design, and a connecting cover 38 is integrally formed on the upper left side of the rear cover body, which connects with the left cover.

[0073] This simplifies the structural design of the rear cover, and the connecting cover on the rear cover allows for better connection with the left cover.

[0074] Specifically, the upper cover includes a muffler housing 39 disposed at the upper end of the housing. An upper heat dissipation cavity is formed between the muffler housing, the upper end of the housing, and the left, right, front, and rear covers on the housing. The upper heat dissipation cavity communicates with the interiors of the left, right, and rear covers. A connecting port 40 is provided on the lower surface of the muffler housing, allowing the interior of the muffler housing to communicate with the upper heat dissipation cavity. A mounting bracket 41 is provided inside the muffler housing, and a muffler 42 is mounted on the mounting bracket. The mounting bracket is provided with a mounting and fixing end that can pass through the through-hole on the muffler housing to the outside and is connected and fixed to the housing. A matching opening 44 is provided on the muffler housing at a position opposite to the exhaust pipe 43 on the muffler to allow the outer end of the exhaust pipe to extend to the outside.

[0075] In this way, the upper cover is set as a muffler housing, and a mounting bracket is arranged inside it. The muffler is then mounted on the mounting bracket. The muffler housing serves both as an upper cover and as a mounting bracket for the muffler, making the installation of the muffler more convenient. The mounting bracket also ensures better fixation of the muffler. A gap is created between the muffler and the muffler housing, and a connecting opening and matching aperture are provided on the muffler housing. This allows cool air to enter through the matching aperture and exit through the connecting opening to the outside of the muffler housing, thus providing targeted heat dissipation to the outer surface of the muffler. Furthermore, the mounting bracket ensures a more stable and reliable installation of the muffler.

[0076] Specifically, the mounting bracket includes a contoured support plate 45 with an overall trapezoidal plate structure at the upper end, on which the muffler is arranged; one end of the contoured plate is partially bent downward to form a first connecting support block 46, which is fixed to the housing with screws; the other end of the contoured plate is partially bent downward and then horizontally outward to form a second connecting support block 47, which is fixed to the housing with screws; the first and second connecting support blocks form the mounting and fixing end.

[0077] In this way, the structural design of the mounting bracket is simpler and more reasonable, which can better support the installation of the muffler and make it more stable and reliable to be fixed to the housing.

[0078] Specifically, each of the first and second connecting blocks on the housing is provided with a fixed support block.

[0079] In this way, by setting fixed blocks on the housing, it is easier to connect and fix it with the mounting bracket.

[0080] Specifically, the first connecting block and the second connecting block are each provided with mounting holes for arranging connecting screws, and the connecting screws are respectively fixed in the threaded holes of the fixing block.

[0081] In this way, by setting mounting holes and arranging connecting screws in the first and second connecting blocks, tolerances can be better compensated, and installation can be made more convenient. After installation, disassembly and assembly are also more convenient.

[0082] Specifically, the central part of the conformal support plate has a hollow hole 48 with an overall trapezoidal structure.

[0083] In this way, by setting perforations on the conformal support plate, the contact with the outer surface of the muffler can be reduced, which is more conducive to heat dissipation.

[0084] Specifically, the matching opening is located on the front right side of the muffler housing.

[0085] This makes the setting of the matching opening position more reasonable.

[0086] Specifically, the muffler housing includes a lower housing 49 and an upper housing 50 that is mounted and fixed above the lower housing.

[0087] This makes the design of the muffler housing simpler and easier to manufacture.

[0088] Specifically, the upper shell includes an outer layer, a middle layer, and an inner layer; the lower shell includes an outer layer and an inner layer; and the middle layer of the upper shell is made of heat-insulating cotton.

[0089] This helps to better prevent the muffler housing from overheating and causing burns.

[0090] Specifically, the outer contour of the muffler housing in the horizontal direction is matched with the outer contour of the upper surface of the housing.

[0091] This maximizes the size of the muffler housing, thereby maximizing the size of the internal muffler and resulting in better noise reduction.

[0092] Specifically, it includes an air filter 51 located at the lower left end of the housing; the air filter is positioned below the engine cylinder head on the housing; a rectangular convex flange 52 is provided at the rear end of the inner side of the air filter; a cavity 53 is recessed inward on the housing corresponding to the inner front end of the convex flange, and a connecting air passage 54 is provided on the side wall of the cavity, which communicates with the interior of the front cover of the housing; a notch 55 is provided on the rear side of the convex flange, and the space inside the convex flange communicates with the interior of the rear cover of the housing.

[0093] This arrangement, placing the air filter below the engine cylinder head, results in a more rational placement and easier connection to the cylinder head. Secondly, by creating a mating flange at the rear end of the air filter's inner side, a cavity is formed within the housing, and a connecting air passage is created on the side wall of the cavity. This connecting air passage connects the interior of the front cover of the housing to the cavity, allowing cool air to pass through and dissipate heat from the air filter and the lower left side of the housing. The air then enters the rear cover of the housing through a notch on the rear side of the mating flange. This structure forms a circulation channel connecting the interiors of the front and rear covers at the lower left side of the housing, thus providing targeted heat dissipation to the lower part of the housing and the air filter, improving overall cooling efficiency.

[0094] Specifically, a mounting flange 56 is provided on the housing and corresponding to the inner side of the air filter, such that the inner side of the mounting flange is fitted against the mounting flange.

[0095] In this way, by adding mounting flanges to the housing, a larger heat dissipation space is created between the housing and the air filter, which is more conducive to heat dissipation. Specifically, the bottom front end of the cavity is recessed inward to form a molding recess 57, and the connecting air passage is provided on the inner side wall of the molding recess.

[0096] This makes it easier to machine interconnecting air passages on the housing.

[0097] Specifically, two dividing ribs 58 are provided inside the connecting airway to divide the connecting airway into three independently arranged airway units.

[0098] This makes the design of the airway more reasonable.

[0099] Specifically, connecting protrusions 59 are provided on the upper and lower sides of the rear end of the air filter and on the upper side of the front end, and are respectively connected and fixed to the housing by connecting screws.

[0100] This makes the air filter installation easier and more stable and reliable.

[0101] Specifically, the front end of the air filter is flush with the front cover, and the rear end of the air filter is flush with the rear side of the housing.

[0102] This allows for a larger size and structure design of the air filter, enabling it to perform better air filtration.

[0103] Specifically, a resonant cavity 61 is connected to the front end of the air filter via a connecting hose 60, and the resonant cavity is connected to the cylinder head via an intake pipe.

[0104] This allows for a more rational arrangement of the resonant cavity, resulting in a smaller length for the connecting tubing and the air intake pipe.

[0105] In summary, the above structure, by setting multiple different heat dissipation air duct paths, with the front impeller drawing in air and the rear impeller dissipating air from the rear, can dissipate heat from all directions in the engine housing, improve the efficiency of cold air intake and hot air exhaust, resulting in better engine cooling and thus improved performance.

[0106] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An engine muffler structure, characterized in that; The system includes a muffler housing located at the top of the housing. An upper heat dissipation cavity is formed between the muffler housing, the top of the housing, and the left, right, front, and rear covers on the housing. The upper heat dissipation cavity communicates with the interiors of the left, right, and rear covers. A connecting port is provided on the lower surface of the muffler housing, allowing the interior of the muffler housing to communicate with the upper heat dissipation cavity. A mounting bracket is provided inside the muffler housing, on which a muffler is mounted. The mounting bracket has a mounting and fixing end that can pass through an opening on the muffler housing to the outside and is connected and fixed to the housing. A matching opening is provided on the muffler housing at a position opposite to the exhaust pipe on the muffler, allowing the outer end of the exhaust pipe to extend to the outside.

2. The engine muffler structure as described in claim 1, characterized in that; The mounting bracket includes a contoured support plate with an overall trapezoidal plate structure at the top, which allows the muffler to be arranged on the contoured support plate; one end of the contoured plate is partially bent downward to form a first connecting support block, which is fixed to the housing with screws; the other end of the contoured plate is partially bent downward and then bent outward horizontally to form a second connecting support block, which is fixed to the housing with screws; the first connecting support block and the second connecting support block form the mounting and fixing end.

3. The engine muffler structure as described in claim 2, characterized in that... ； Each of the first and second connecting blocks on the housing is provided with a fixed support block.

4. The engine muffler structure as described in claim 3, characterized in that; The first connecting block and the second connecting block are each provided with mounting holes for arranging connecting screws, and the connecting screws are respectively fixed in the threaded holes of the fixing block.

5. The engine muffler structure as described in claim 2, characterized in that... The profile support plate has a hollowed-out hole in the middle, which is a trapezoidal structure.

6. The engine muffler structure as described in claim 1, characterized in that... The matching opening is located on the front right side of the muffler housing.

7. The engine muffler structure as described in claim 1, characterized in that; The muffler housing includes a lower housing and an upper housing that is mounted and fixed above the lower housing.

8. The engine muffler structure as described in claim 7, characterized in that; The upper shell includes an outer layer, a middle layer, and an inner layer; the lower shell includes an outer layer and an inner layer; and the middle layer of the upper shell is made of heat-insulating cotton.

9. The engine muffler structure as described in claim 1, characterized in that; The outer contour of the muffler housing in the horizontal direction is matched with the outer contour of the upper surface of the housing.

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