Engine air intake structure

Abstract

The utility model discloses an engine air intake structure relates to engine technical field, including the shell, is equipped with the mounting groove on the shell, is equipped with the apron in the mounting groove dismounts, and is equipped with the air inlet slit between apron side and the mounting groove groove wall, is equipped with the air inlet pipe in the mounting groove upwards, and apron is equipped with the baffle cover to the mounting groove one side, and the air inlet pipe sets up in the baffle cover, and does not contact with the baffle cover, and the baffle cover outside board height is greater than the inside board height. Through adopting the apron and air inlet pipe structure of labyrinth, not only effectively prevent water or other foreign matter to enter the engine inside, ensure the safe operation of engine, still can guarantee the premise of air intake efficiency, simplify overall structure, reduce the manufacturing cost, improve the convenience of installation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to an engine intake structure. Background Technology

[0002] To prevent foreign objects from falling into the engine through the air intake and affecting its normal operation, a baffle is typically installed at the engine air intake. The main function of the baffle is to block foreign objects from entering the engine and protect critical engine components. However, existing baffle structures have several shortcomings. Firstly, their complex structure requires intricate fixing mechanisms to securely install them at the air intake, increasing manufacturing costs and the difficulty of installation and maintenance. Secondly, the fit between existing baffles and the intake passage is not ideal, often causing interference. This interference leads to poor airflow, affecting engine intake efficiency and consequently reducing engine performance and fuel economy.

[0003] Chinese Patent Publication No. CN209855936U, Publication Date: December 27, 2019, discloses a Chinese patent entitled "Engine Intake Port Cover," which includes a housing. The shape of the housing is adapted to the engine intake port. The housing is made of plastic, and multiple elliptical protrusions are formed on the housing. The shape of the protrusions is adapted to the shape and position of the engine intake port, forming a structure in which the protrusions engage with small holes in the engine intake port when the housing is fastened to the engine intake port. The housing is provided with a fastening device for further fastening the housing to the engine intake port. This cover has a complex installation structure and high manufacturing cost. Summary of the Invention

[0004] This utility model provides an engine intake structure that, by setting a labyrinthine cover and intake pipe structure, ensures intake efficiency while preventing water or other foreign objects from entering. The structure is simple and easy to manufacture.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an engine intake structure, including an outer shell, an installation groove on the outer shell, a cover plate detachably installed in the installation groove, an intake gap between the side of the cover plate and the wall of the installation groove; an intake pipe is installed facing upward in the installation groove, a baffle is installed on the side of the cover plate facing the installation groove, the intake pipe is installed inside the baffle and does not contact the baffle, and the height of the outer side plate of the baffle is greater than the height of the inner side plate.

[0006] Preferably, the outer end of the cover plate has an arc-shaped portion, with the arc-shaped portion facing downwards. This allows the cover plate to fit snugly against the outer shell, resulting in a better appearance and easier disassembly. The arc-shaped portion serves as a handle, facilitating operation and disassembly. The arc-shaped design not only enhances the aesthetics but also provides operators with a convenient disassembly method, improving operational convenience and efficiency.

[0007] Preferably, the baffle is a rectangular structure with an open bottom surface, positioned at the center of the cover plate. An external air intake channel is formed between the baffle and the mounting groove. The rectangular baffle design makes the air intake channel more regular, which is conducive to uniform airflow and improves air intake efficiency.

[0008] Preferably, a labyrinthine structure is formed between the baffle and the air intake pipe, with the top of the air intake pipe higher than the bottom of the inner side plate of the baffle. This prevents foreign objects from entering the air intake pipe. The labyrinthine structure effectively blocks foreign objects from entering the air intake pipe, and the design that the top of the air intake pipe is higher than the bottom of the inner side plate of the baffle further enhances the blocking effect, ensuring the cleanliness of the intake air.

[0009] Preferably, the air intake pipe is angled towards the inner side plate. An air inlet is located at the top of the air intake pipe. This facilitates air intake. The optimized air intake path allows air to enter more smoothly, further improving intake efficiency.

[0010] Preferably, the inner end wall of the mounting slot is inclined to form an inclined section, which is tilted towards the air intake pipe. This facilitates air intake. The inclined section design guides air smoothly into the air intake channel, reducing intake resistance and improving the smoothness of air intake.

[0011] Preferably, the outer end of the mounting groove is a downward-sloping discharge section. An internal air intake channel is formed between the baffle and the air intake pipe. The downward-sloping discharge section facilitates the removal of foreign objects.

[0012] Preferably, the cover plate has several mounting posts on both sides, and each mounting post has a first mounting hole. The design of the mounting posts and the first mounting holes provides a stable structure for fixing the cover plate, ensuring a firm connection between the cover plate and the outer shell, and improving the overall structural stability.

[0013] Preferably, the cover plate has baffles on its opposite sides facing downwards, and the baffles and the shield do not contact each other. External air enters the external air intake channel through the air intake gap, then enters the air intake port through the internal air intake channel, while foreign objects are discharged through the discharge section of the mounting slot. The baffle design further prevents foreign objects from entering, and since it does not contact the shield, it ensures smooth airflow. Foreign objects are discharged through the discharge section, effectively preventing their accumulation and maintaining the cleanliness of the air intake channel.

[0014] Preferably, the mounting groove has several mounting protrusions around the air intake pipe, and the top surface of each mounting protrusion has a second mounting hole. The mounting protrusions correspond to mounting posts, and bolts and nuts pass through the first and second mounting holes to secure the cover plate. The design of the mounting protrusions and second mounting holes, in conjunction with the mounting posts and the first mounting hole, provides a robust and reliable installation method through bolt and nut fixation, ensuring the stability of the cover plate during use and improving the overall structural reliability.

[0015] Beneficial effects: By adopting a labyrinthine cover and intake pipe structure, this utility model not only effectively prevents water or other foreign objects from entering the engine and ensures the safe operation of the engine, but also simplifies the overall structure, reduces manufacturing costs, and improves the convenience of installation and maintenance while ensuring intake efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the outer shell of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the cover plate of this utility model.

[0019] Figure 4 This is a cross-sectional view of the present invention.

[0020] Reference numerals: 1: Outer shell; 1.1: Mounting groove; 1.2: Inclined part; 1.3: Exhaust part; 1.4: Inlet pipe; 1.5: Inlet; 1.6: Mounting protrusion; 1.7: Second mounting hole; 2: Cover plate; 2.1: Baffle; 2.2: Arc-shaped part; 2.3: Baffle; 2.4: Mounting post; 2.5: First mounting hole; 2.6: Inner side plate; 2.7: Outer side plate; 3: Inner air intake channel; 4: Outer air intake channel; 5: Air intake gap. Detailed Implementation

[0021] The engine intake structure provided by this utility model is based on the core design concept of "maze-style protection + high-efficiency intake". Through the coordinated cooperation of the outer shell 1, cover plate 2, intake pipe 1.4 and baffle 2.1, it can effectively block water or foreign objects from entering while ensuring the engine's air intake requirements. Moreover, the overall structure is simple and easy to manufacture, which greatly reduces production and maintenance costs.

[0022] exist Figure 1 and Figure 4In the illustrated embodiment, the engine intake structure uses the outer shell 1 as the basic carrier. The surface of the outer shell 1 is provided with a mounting groove 1.1. The mounting groove 1.1 serves as the core assembly area, integrating key components such as the cover plate 2 and the intake pipe 1.4. The cover plate 2 is detachably installed in the mounting groove 1.1, and an intake gap 5 is reserved between its side and the groove wall of the mounting groove 1.1. This gap is the initial channel for external air to enter the engine, ensuring the intake volume and initially filtering large particles (such as leaves and pebbles) to prevent such impurities from directly entering subsequent structures. An air intake pipe 1.4 is installed inside the mounting slot 1.1 facing upwards. The air intake port 1.5 at the top of the air intake pipe 1.4 is directly connected to the engine air intake system, which is the final channel for air to enter the engine. A baffle 2.1 is fixed on the side of the cover plate 2 facing the mounting slot 1.1. The baffle 2.1 encloses the air intake pipe 1.4 without contacting it, forming a "cover surrounding the pipe" structure. At the same time, the height of the outer side plate 2.7 of the baffle 2.1 is greater than the height of the inner side plate 2.6. This height difference design provides the first line of defense against foreign objects. Rainwater or dust splashed from the outside is easily blocked by the higher outer side plate 2.7 and is difficult to enter the interior of the baffle 2.1, reducing the probability of foreign objects contacting the air intake pipe 1.4 from the source.

[0023] exist Figure 3 In the preferred embodiment shown, the arc-shaped portion 2.2 at the outer end of the cover plate 2 combines ease of operation with aesthetic practicality. The arc-shaped portion 2.2 faces downwards, fitting snugly against the surface of the outer shell 1, avoiding the visual abruptness of right-angled edges and making the entire intake structure appear smoother and more aesthetically pleasing, consistent with the overall industrial design style of the engine. More importantly, the arc-shaped portion 2.2 is essentially an integrated handle. When disassembling the cover plate 2 for maintenance, operators do not need to use tools to pry it; they can easily remove the cover plate 2 from the mounting slot 1.1 simply by holding the arc-shaped portion 2.2, significantly reducing the difficulty of disassembly and assembly. Traditional cover plates 2 often lack a dedicated force application point, easily leading to edge deformation or scratches on the outer shell 1 during disassembly. The existence of the arc-shaped portion 2.2 completely solves this problem, protecting the structural integrity of the cover plate 2 and the outer shell 1, shortening maintenance time, and improving operational efficiency, especially suitable for the rapid disassembly and assembly needs during regular engine maintenance.

[0024] exist Figure 3 and Figure 4In the preferred embodiment shown, the rectangular structure and central positioning of the baffle 2.1 further optimize intake efficiency and airflow stability. The baffle 2.1 is designed as a rectangle with an open bottom. This regular shape forms a regular external intake channel 5 with the inner wall of the mounting groove 1.1. After external air enters from the intake gaps 5 on the side of the cover plate 2, it flows evenly along the external intake channel 5 into the baffle 2.1, avoiding airflow turbulence or dead zones caused by an irregularly shaped baffle 2.1, ensuring stable airflow and reducing intake resistance. The baffle 2.1 is positioned at the center of the cover plate 2, making the external intake channel 5 symmetrically distributed within the mounting groove 1.1. After airflow enters from the gaps on both sides of the cover plate 2, it converges towards the center and smoothly enters the baffle 2.1, avoiding airflow deviation caused by unilateral intake, ensuring uniform airflow pressure around the intake pipe 1.4, and meeting the stable intake volume requirements of the engine under different operating conditions. The bottom opening design provides ample space for airflow to enter the interior of the shield 2.1, while the four sides of the rectangular structure can block foreign objects from different directions, further enhancing the protective effect.

[0025] exist Figure 4 In the preferred embodiment shown, the labyrinthine structure formed by the baffle 2.1 and the intake pipe 1.4 is the core defense against foreign objects entering the engine. The labyrinthine structure, through the gap between the baffle 2.1 and the intake pipe 1.4, creates multiple bends in the airflow path: after entering the baffle 2.1, external air must bypass the side wall of the intake pipe 1.4 to reach the top intake port 1.5, rather than entering directly in a straight line. This bend significantly increases the difficulty for water or foreign objects to travel. Rainwater, under the influence of gravity, easily drips along the inner side plate 2.6 of the baffle 2.1 or the outer wall of the intake pipe 1.4, and cannot continue upwards with the airflow to enter the intake port 1.5; dust and other solid impurities will settle due to inertia at the airflow bends and remain at the bottom of the mounting groove 1.1, without being sucked into the intake pipe 1.4. Meanwhile, the design of the top of the intake pipe 1.4 being higher than the bottom of the inner side plate 2.6 of the baffle 2.1 creates a "height difference barrier," preventing rainwater and foreign objects from entering the intake port 1.5 and completely eliminating the risk of malfunctions caused by water entering the engine. Compared to the traditional straight-channel intake structure, the labyrinth design significantly improves the foreign object prevention effect without increasing intake resistance, providing a reliable guarantee for the safe operation of the engine.

[0026] exist Figure 4In the preferred embodiment shown, the inclined arrangement of the intake pipe 1.4 and the top intake port 1.5 further improves intake efficiency from the perspective of airflow guidance. The intake pipe 1.4 is inclined towards the inner side plate 2.6 of the baffle 2.1. This angle design makes the air intake port 1.5 of the intake pipe 1.4 more compatible with the airflow path inside the baffle 2.1. After the airflow from the outer intake channel 5 enters the baffle 2.1, it can flow naturally towards the intake port 1.5 along the inclined direction, reducing the impact and turbulence of the airflow in the channel and reducing intake resistance. The traditional vertically arranged intake pipe 1.4 is prone to backflow of airflow at the top, affecting the intake speed, while the inclined structure makes the airflow transition smoother, ensuring that air enters the engine with higher efficiency, especially when the engine is running under high load and the demand for intake volume is large, it can better meet the intake demand. The air inlet 1.5 at the top of the air inlet pipe 1.4 faces directly into the baffle 2.1, maximizing the area of ​​the air inlet 1.5 while preventing foreign objects from falling directly into the air inlet 1.5 due to its outward orientation. The baffle 2.1 blocks foreign objects from entering the air inlet 1.5, further balancing air intake efficiency and protection effect.

[0027] In actual operation, the intake and protection processes of this intake structure work together efficiently: external air first enters the mounting groove 1.1 through the intake gap 5 on the side of the cover plate 2, where large particles are initially filtered before flowing along the outer intake channel 5 to the central baffle 2.1; after entering the baffle 2.1, the airflow bypasses the intake pipe 1.4 along a labyrinthine path, further separating rainwater and dust during the bend, and finally, clean air enters the engine through the intake port 1.5 at the top of the intake pipe 1.4; while the separated rainwater and impurities flow outward along the inclined wall of the mounting groove 1.1 under the action of gravity and are discharged from the reserved discharge part 1.3, without accumulating inside the structure. This closed-loop process of "intake-filtration-separation-discharge" ensures the required intake volume and cleanliness of the engine, while also achieving effective protection against foreign objects. At the same time, the overall structure is simple, with few parts, facilitating mass production and subsequent maintenance.

[0028] This invention constructs an engine intake structure that balances efficient air intake and reliable protection through the convenient design of the arc-shaped portion 2.2 of the cover plate 2, the airflow optimization of the rectangular structure of the baffle 2.1, the core function of the labyrinth structure in preventing foreign objects, and the efficiency improvement of the inclined setting of the intake pipe 1.4. This structure eliminates the need for complex filtration devices, achieving both objectives through the ingenious combination of mechanical structures. It significantly reduces manufacturing costs and maintenance difficulty, providing strong support for the long-term stable operation of the engine, and is particularly suitable for applications such as construction machinery and automobiles that are prone to contact with water and dust.

[0029] exist Figure 3In the preferred embodiment shown, the inclined portion 1.2, which is inclined on the inner end wall of the mounting groove 1.1, is a key design feature for guiding airflow and reducing intake resistance. The inclined portion 1.2 is inclined towards the intake pipe 1.4, and its inclination angle is precisely matched with the inclination direction of the intake pipe 1.4, forming a "sloping surface guiding airflow" path. When external air enters the outer intake channel 5 from the intake gap 5 on the side of the cover plate 2, it will flow naturally along the inclined surface of the inclined portion 1.2 into the interior of the baffle 2.1, rather than directly impacting the vertical groove wall. Traditional vertical groove walls easily cause backflow after airflow impact, forming vortices, increasing intake resistance, and affecting intake efficiency; while the inclined surface design of the inclined portion 1.2 makes the airflow transition smoother, reduces the energy loss of airflow at the groove wall, and ensures that air enters the inner intake channel 3 at a stable flow rate, and finally flows efficiently to the intake port 1.5 at the top of the intake pipe 1.4. Especially when the engine is operating under high load and the demand for air intake is large, the smooth airflow guided by the inclined part 1.2 can better meet the engine's needs and avoid power loss due to insufficient air intake. At the same time, the inclined part 1.2 can also block some of the water that slides down the inner wall of the mounting groove 1.1. Rainwater or condensate flows along the inclined part 1.2 to the discharge part 1.3 at the outer end of the mounting groove 1.1 under the action of gravity, avoiding accumulation around the intake pipe 1.4, indirectly reducing the risk of water entering the intake pipe 1.4, and further enhancing the foreign object prevention function.

[0030] exist Figure 3 In the preferred embodiment shown, the downward-sloping discharge section 1.3 on the outer side of the mounting groove 1.1 provides an efficient discharge channel for foreign objects entering the mounting groove 1.1, achieving separation of "air intake" and "exhaust". The inclined angle design of the discharge section 1.3 ensures that foreign objects can flow out naturally under gravity: when rainwater, dust, or small particulate impurities enter the outer air intake channel 5, the portion that cannot enter the inner air intake channel 3 with the airflow will flow along the groove wall of the mounting groove 1.1 to the discharge section 1.3, and then slide out of the outer casing 1 along the inclined discharge section 1.3, without accumulating water or dust in the mounting groove 1.1. In traditional mounting grooves 1.1 without a dedicated discharge structure, foreign objects easily accumulate at the bottom of the groove, which may block the air intake gap 5 or corrode parts over time, affecting the service life of the air intake structure; while the existence of the discharge section 1.3 completely solves this problem, eliminating the need for frequent manual cleaning and reducing maintenance costs. Meanwhile, the downward tilt of the discharge section 1.3 and the inner side plate 2.6 of the baffle 2.1 can prevent external foreign objects (such as mud and water splashed on the ground) from entering the mounting groove 1.1 in the opposite direction through the discharge section 1.3, forming a "one-way discharge" protective effect, ensuring that the air intake channel is always kept clean and not subject to secondary pollution from the external environment.

[0031] exist Figure 2In the preferred embodiment shown, the mounting posts 2.4 and the first mounting holes 2.5 on both sides of the cover plate 2 provide a stable and reliable connection for fixing the cover plate 2 to the outer shell 1, while indirectly optimizing the air intake structure. The mounting posts 2.4 are vertically arranged on both sides of the cover plate 2, and their length is adapted to the depth of the mounting groove 1.1, ensuring that the cover plate 2 is flush with the surface of the outer shell 1 after installation, avoiding appearance problems and reduced fit caused by protrusions or depressions in the cover plate 2. The first mounting holes 2.5 on the mounting posts 2.4 correspond precisely to the second mounting holes 1.7 in the mounting groove 1.1, and are fixed by bolts and nuts. Compared with snap-fit ​​connections, bolt connections have stronger fastening power and can resist vibrations during engine operation, preventing the cover plate 2 from loosening and causing changes in the width of the air intake gap 5. Unstable width of the air intake gap 5 will cause fluctuations in the air intake volume, affecting engine performance, while bolt fixing can keep the position of the cover plate 2 stable for a long time, ensuring a constant air intake volume. In addition, the presence of the mounting post 2.4 creates a uniform air intake gap 5 between the cover plate 2 and the wall of the mounting groove 1.1, eliminating the need for additional complex gap structures on the edge of the cover plate 2, simplifying the processing of the cover plate 2, reducing manufacturing costs, and ensuring that the airflow enters evenly from both sides, avoiding airflow deviation caused by unilateral air intake.

[0032] exist Figure 2 In the preferred embodiment shown, the baffles 2.3 on both sides of the cover plate 2, facing downwards, further enhance the anti-foreign object effect without affecting airflow, while optimizing airflow guidance. The baffles 2.3 are perpendicular to the surface of the cover plate 2, maintaining a certain distance from and not in contact with the shield 2.1. This avoids interference with the airflow inside the shield 2.1 and forms a "lateral barrier": when there is lateral splashing rainwater or foreign objects (such as stones kicked up by wheels during driving), the baffles 2.3 can directly block them from entering the air intake gap 5, reducing the number of foreign objects entering the external air intake channel 5 and alleviating the filtration pressure on the subsequent labyrinth structure. From the perspective of airflow guidance, the baffles 2.3 allow external air to enter the air intake gap 5 more orderly. Under the guidance of the baffles 2.3, the airflow will flow along the inner side of the baffles 2.3 towards the gap, avoiding a decrease in air intake efficiency caused by chaotic airflow. Especially in windy conditions, the baffles 2.3 can reduce airflow disturbance and ensure stable air intake. In addition, the downward-facing baffle 2.3 can guide the blocked rainwater along the surface of the baffle 2.3 to the discharge part 1.3 of the mounting groove 1.1, further improving drainage efficiency and preventing rainwater from accumulating at the edge of the cover plate 2 and seeping into the engine.

[0033] exist Figure 2In the preferred embodiment shown, the mounting protrusions 1.6 and second mounting holes 1.7 circumferentially arranged on the intake pipe 1.4 within the mounting groove 1.1 form a precise fit with the mounting posts 2.4 of the cover plate 2. Preferably, four mounting posts 2.4 and four mounting protrusions 1.6 are provided to improve overall performance in terms of both structural stability and assembly convenience. The mounting protrusions 1.6 are evenly distributed around the intake pipe 1.4, and their top surface height is consistent with the length of the mounting posts 2.4, ensuring that after the cover plate 2 is installed, the mounting posts 2.4 can completely fit the top surface of the mounting protrusions 1.6, so that the cover plate 2 is subjected to uniform force and avoids deformation of the cover plate 2 caused by unilateral force. The second mounting holes 1.7 on the mounting protrusions 1.6 correspond to the first mounting holes 2.5 of the mounting posts 2.4. After the bolts and nuts pass through the two holes, the cover plate 2 can be firmly fixed in the mounting groove 1.1. Even under the condition of severe engine vibration, the cover plate 2 can be guaranteed not to loosen, ensuring the stability of the position of the intake gap 5 and the labyrinth structure, and not affecting the foreign object prevention effect. Meanwhile, the presence of the mounting protrusion 1.6 keeps the bolt connection point away from the bottom of the mounting groove 1.1, preventing water accumulation in the mounting groove 1.1 from corroding the bolts, extending their service life, and reducing the difficulty of bolt disassembly during maintenance. Compared to directly setting mounting holes at the bottom of the mounting groove 1.1, the mounting protrusion 1.6 also reduces the amount of machining required at the bottom of the mounting groove 1.1, simplifies the manufacturing process of the outer casing 1, and further reduces production costs.

[0034] exist Figure 2 In the preferred embodiment shown, during actual operation, the components work together to achieve efficient air intake and reliable foreign object protection. External air enters the external air intake channel 5 through the air intake gaps 5 around the cover plate 2. The airflow flows smoothly along the inclined portion 1.2 at the inner end of the mounting groove 1.1 to the baffle 2.1 and enters the internal air intake channel 3 between the baffle 2.1 and the air intake pipe 1.4. Under the action of the labyrinth structure, rainwater and dust are separated, and clean air enters the engine through the air intake port 1.5 at the top of the air intake pipe 1.4. The separated foreign objects flow along the inner side plate 2.6 of the baffle 2.1 or the groove wall of the mounting groove 1.1 to the discharge portion 1.3 at the outer end and are finally discharged from the outer casing 1. The cover plate 2 maintains a stable position through the cooperation of the mounting post 2.4, the mounting protrusion 1.6 and the bolts and nuts, ensuring that the air intake gaps 5 and the protective structures function normally.

[0035] This invention constructs a fully functional engine intake structure through airflow guidance via the inclined portion 1.2 of the mounting groove 1.1, foreign object discharge via the discharge portion 1.3, stable fixation via the mounting column 2.4 and the mounting protrusion 1.6, and additional protection via the baffle 2.3. Based on the labyrinthine core protection, this structure further optimizes intake efficiency and foreign object protection, while simplifying the structure and reducing costs, providing a reliable guarantee for the safe and stable operation of the engine.

Claims

1. An engine intake structure, characterized in that, Includes an outer casing, on which a mounting groove is provided, and a cover plate is detachably installed inside the mounting groove. An air intake gap is provided between the side of the cover plate and the wall of the mounting groove. An air inlet pipe is installed facing upward inside the mounting slot. A baffle is installed on the side of the cover plate facing the mounting slot. The air inlet pipe is located inside the baffle and does not contact the baffle. The height of the outer side plate of the baffle is greater than the height of the inner side plate.

2. The engine intake structure according to claim 1, characterized in that, The outer end of the cover plate has an arc-shaped part, which is set downwards.

3. The engine intake structure according to claim 2, characterized in that, The baffle is a rectangular structure with an opening on the bottom, and it is located at the center of the cover plate.

4. The engine intake structure according to claim 3, characterized in that, The shield and the air intake pipe form a labyrinthine structure, with the top of the air intake pipe higher than the bottom of the inner side plate of the shield.

5. An engine intake structure according to claim 1 or 4, characterized in that, The air intake pipe is inclined towards the inner side plate, and an air inlet is provided at the top of the air intake pipe.

6. In the engine intake structure according to claim 1, the inner end wall of the mounting slot is inclined to form an inclined portion, and the inclined portion is inclined toward the intake pipe.

7. An engine intake structure according to claim 1 or 6, wherein the outer end of the mounting groove is a discharge part inclined downwards, and an inner intake channel is formed between the baffle and the intake pipe.

8. An engine intake structure according to claim 1 or 3, wherein the cover plate is provided with a plurality of mounting posts on both sides, and the mounting posts are provided with first mounting holes.

9. An engine intake structure according to claim 8, wherein the cover plate has baffles on opposite sides facing downwards, the baffles and the cover do not contact each other, and an external intake channel is formed between the cover and the mounting groove.

10. An engine intake structure according to claim 6, wherein the mounting groove is provided with a plurality of mounting protrusions in the circumference of the intake pipe, and the top surface of the mounting protrusions is provided with a second mounting hole.

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