Engine air intake filter cleaning device for an outboard motor

Abstract

The application belongs to the technical field of outboard motors, and discloses an engine air intake filtering and cleaning device of an outboard motor, which comprises a mounting ring, the mounting ring is fixedly installed on the front face of an engine throttle valve, the front face of the mounting ring is fixedly connected with a cleaning mechanism, the side face of the cleaning mechanism is provided with an air inlet, the inside of the mounting ring is rotatably sleeved with a rotating shaft, the rotating shaft is covered with flow guide holes, the inside of the flow guide holes is sleeved with a replacement assembly, the front end of the replacement assembly extends to the front face of the mounting ring and is pressed on the mounting ring by the cleaning mechanism; the replacement assembly comprises a collection plate covering the front face of the rotating shaft. Due to the arrangement of the rotating shaft and the flow guide holes, the continuously inhaled air is filtered by the cleaning mechanism and is also adsorbed by the adsorption liner in the flow guide holes, so that the water vapor in the air is further adsorbed, the water vapor is prevented from entering the throttle valve, the dryness of the gas is improved, and the quality of the inhaled air is ensured.

Description

Technical Field

[0001] This invention belongs to the field of outboard motor technology, specifically an engine intake air filtration and cleaning device for an outboard motor. Background Technology

[0002] Outboard motors, as core power units suspended from the stern of ships and providing power to small and medium-sized vessels, possess advantages such as compact structure, convenient assembly and disassembly, and strong adaptability. They are widely used in various waterborne scenarios, including inland waterway transportation, near-shore operations, recreational fishing, and water rescue, and are the core power equipment for small vessels. During the operation of an outboard motor engine, it needs to continuously draw in sufficient clean air to ensure complete fuel combustion. The quality of the intake air directly determines the engine's power performance, fuel economy, and service life. The intake air filtration and cleaning system is a key auxiliary structure that ensures the stable operation of the outboard motor.

[0003] However, the air above water is much cleaner than on land, and the engine runs for a relatively short time. Therefore, the filtration targets of outboard motor engines and land engines are different. Outboard motor engines filter more seawater droplets, sand and salt mist aerosols formed by salt particles, and very few dust particles. However, most existing outboard motor engines do not have a filter installed in front of the throttle valve. Instead, they are mostly equipped with air mufflers to reduce intake noise and block some large particles or insects through physical structure. However, they do not have the ability to finely filter fine dust and cannot guarantee the cleanliness of the engine intake air.

[0004] Therefore, there is an urgent need to develop an engine air intake filtration and cleaning device for outboard motors to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an engine intake air filtration and cleaning device for outboard motors, which has advantages such as good filtration and cleaning effect and easy maintenance.

[0006] The rotating shaft and its internal guide holes ensure that the continuously drawn-in air is filtered by the cleaning mechanism and adsorbed by the adsorption bushing in the guide holes. This further adsorbs moisture in the air, preventing moisture from entering the throttle valve, improving the dryness of the gas, and ensuring the quality of the air drawn in by the throttle valve.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an engine intake air filter cleaning device for an outboard motor, comprising a mounting ring, the mounting ring being fixedly installed on the front of the engine throttle valve, a cleaning mechanism being fixedly connected to the front of the mounting ring, an air intake port being provided on the side of the cleaning mechanism, a rotating shaft being rotatably sleeved inside the mounting ring, the rotating shaft being covered with evenly distributed guide holes, a replacement component being sleeved inside the guide holes, the front end of the replacement component extending to the front of the mounting ring and being pressed against the mounting ring by the cleaning mechanism; The replacement assembly includes a collection plate covering the front of the rotating shaft. Multiple adsorption bushings are fixedly connected to the back of the collection plate. Each adsorption bushing corresponds to a flow guide hole and is fitted inside the corresponding flow guide hole. The collection plate has through holes communicating with the adsorption bushings. The collection plate is pressed against the front end of the mounting ring by a cleaning mechanism.

[0008] Preferably, at least three fastening components are evenly distributed within the mounting ring. The front end of each fastening component is connected through the mounting ring to the cleaning mechanism, and the rear end of each fastening component is connected through the mounting ring to the throttle body.

[0009] Preferably, a guide ball located between multiple through holes is fixedly connected to the front of the collection plate. The outer surface of the guide ball is a spherical smooth arc surface. A connection hole is opened on the front of the guide ball, and the back of the front end of the cleaning mechanism is connected to the connection hole.

[0010] Preferably, the cleaning mechanism includes a connecting plate that fits against the front of the mounting ring and the rotating shaft. A cleaning component is fixedly connected to the front of the connecting plate, a capping component is connected to the front end of the cleaning component, and the back of the capping component is connected to the connecting hole.

[0011] Preferably, the sealing assembly includes a cover plate that fits against the front of the cleaning assembly, a sealing plate that is sealed and threaded onto the front end of the cleaning assembly is pasted on the back of the cover plate, a positioning shaft is fixedly connected to the back of the cleaning assembly, the rear end of the positioning shaft is movably inserted into the interior of the connecting hole, and the outer surface of the positioning shaft contacts the inner wall of the connecting hole through ball bearings.

[0012] Preferably, the cleaning assembly includes a protective cover clamped between the cover plate and the connecting plate, and the air inlet is opened at the bottom of the protective cover and tangentially communicates with the bottom of the filter chamber; The protective cover has a filter chamber on its front side, and the filter chamber is filled with a filter element made of water-absorbing material.

[0013] Preferably, the protective cover is provided with a centrifugal cleaning mechanism located outside the replacement component, including a centrifugal component and a flow guiding component; The centrifugal assembly consists of a linkage ring coaxially sleeved between the protective cover and the guide ball, and linkage blades covering its outer surface. The linkage ring has connecting grooves that correspond one-to-one with the linkage blades and are alternately distributed. The flow guiding assembly consists of a flow guiding shroud fitted inside the linkage ring, a first flow guiding port, and a second flow guiding port. The first flow guiding port is located at the bottom of the flow guiding shroud and is formed by extensions from both ends of the flow guiding shroud itself. The second flow guiding port is located at the top of the inner cavity of the protective shroud and is tangentially connected to the top of the filter cavity. The gas in the filter chamber enters the space between the protective cover and the linkage ring through the second guide port, then enters the guide cover through the first guide port through the connecting groove, and finally enters the throttle valve through the adsorption bushing in the guide hole.

[0014] Preferably, the protective cover located inside the filter element is a water-absorbing liner and cooperates with the filter element in the filtration chamber. There is a gap between the outer side of the linkage blade and the water-absorbing liner. The back of the linkage ring is engaged with the front of the collecting plate and rotates synchronously. The front of the flow guide cover is engaged with the back of the cover plate and remains stationary.

[0015] Preferably, the fastening assembly includes a connecting rod sleeved inside the mounting ring, the front end of the connecting rod extending into the interior of the cleaning mechanism and fixedly connected to a tightening positioning head embedded in the back of the filter chamber, the front of the tightening positioning head having an adapter hole, and the rear end of the connecting rod extending to the rear of the mounting ring and fixedly connected to a locking shaft tightened on the throttle valve. The adapter hole is internally inserted with a matching short shaft, the front end of which is fixedly connected to the back of the filter element.

[0016] Preferably, two baffles are embedded in the back of the inner cavity of the filter chamber. The two baffles are respectively located at both ends of the air inlet and communicating with the filter chamber. The rear end of the baffle is supported by a spring, and the front end of the baffle is supported by the back of the filter element. The filter element consists of two identical independent structures, with each end of the independent structure located between the second flow guide port and the air inlet, and each abutting against the front end of a corresponding baffle. The cover plate is also fitted with two mounting plates, which correspond one-to-one with two independent structures and are fixedly connected.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: Due to the design of the rotating shaft and its internal guide holes, this invention ensures that the continuously drawn-in air is filtered by the cleaning mechanism and adsorbed by the adsorption bushing inside the guide holes. This ensures that the water vapor in the air is further adsorbed, preventing water vapor from entering the throttle valve, improving the dryness of the gas, and ensuring the quality of the air drawn in by the throttle valve.

[0018] Because of the interchangeable components, this invention not only facilitates further adsorption and purification, but also prevents a small amount of filtered salt mist from entering and corroding the inner wall of the guide hole, which could eventually clog the guide hole and cause poor air intake.

[0019] Due to the centrifugal component, the centrifugal component, in conjunction with the flow guide component, rotates with the intake air, giving the intake air centrifugal force. This causes the intake air to be thrown out of tiny particles that are not intercepted by the filter element, and also facilitates the removal of micron-sized salt spray components, effectively improving the air quality entering the throttle valve.

[0020] Due to the fastening assembly, this invention facilitates the assembly and fixing of the cleaning mechanism and mounting ring to the throttle intake end through the cooperation of the connecting rod, its two locking shafts, and the tightening positioning head. Furthermore, the fastening assembly itself can be easily disassembled and assembled through the adapter hole. Moreover, the adapter hole also facilitates the positioning of the filter element with the cooperation of the short shaft, ensuring that the two independent structures in the filter element remain stable and are not pushed by the airflow.

[0021] Due to the baffle design, this invention, in conjunction with the mounting plate, allows for the easy removal of a corresponding independent structure from the filter element for disassembly, cleaning, or replacement. After removing this independent structure, the baffle at the corresponding end of the air inlet is popped out and blocked by the spring, ensuring that the airflow entering the air inlet can only enter the second guide port through another independent structure, thus ensuring the filter element's filtration and allowing for cleaning and replacement without shutting down the machine.

[0022] This invention, through a highly integrated structural design, greatly controls the space occupancy of the filter structure while ensuring the filtration effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure on the back of the present invention; Figure 3 This is a schematic diagram of the disassembled capping assembly of the present invention; Figure 4 This is a schematic diagram of the structure on the back of the sealing assembly of the present invention; Figure 5 This is a schematic diagram of the front structure of the sealing assembly of the present invention. Figure 6 for Figure 3 A front view of the structure; Figure 7 This is a schematic diagram of the structure of the replacement component in this invention; Figure 8 This is a schematic diagram of the fastening assembly of the present invention.

[0024] In the diagram: 1. Mounting ring; 2. Cleaning mechanism; 21. Cleaning component; 211. Protective cover; 212. Filter chamber; 213. Filter element; 214. Linkage ring; 215. Linkage blade; 216. Connecting groove; 217. Flow guide cover; 218. First flow guide port; 219. Second flow guide port; 22. Connecting plate; 23. Cover assembly; 231. Cover plate; 232. Sealing plate; 233. Positioning shaft; 234. Mounting plate; 3. Air inlet; 4. Rotating shaft; 5. Flow guide hole; 6. Replacement assembly; 61. Collection plate; 62. Adsorption bushing; 63. Flow guide ball; 64. Connecting hole; 7. Fastening assembly; 71. Locking shaft; 72. Tightening positioning head; 73. Connecting rod; 74. Adapter hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1 to 8 As shown, the present invention provides an engine intake air filter cleaning device for an outboard motor, including a mounting ring 1, which is fixedly installed on the front of the engine throttle valve. A cleaning mechanism 2 is fixedly connected to the front of the mounting ring 1. An air inlet 3 is opened on the side of the cleaning mechanism 2. A rotating shaft 4 is rotatably sleeved inside the mounting ring 1. The rotating shaft 4 is covered with evenly distributed guide holes 5. A replacement component 6 is sleeved inside the guide holes 5. The front end of the replacement component 6 extends to the front of the mounting ring 1 and is pressed onto the mounting ring 1 by the cleaning mechanism 2. The replacement assembly 6 includes a collection plate 61 covering the front of the rotating shaft 4. Multiple adsorption bushings 62 are fixedly connected to the back of the collection plate 61. The adsorption bushings 62 correspond one-to-one with the guide holes 5 and are sleeved inside the corresponding guide hole 5. The collection plate 61 has through holes that communicate with the adsorption bushings 62. The collection plate 61 is pressed against the front end of the mounting ring 1 by the cleaning mechanism 2. Due to the arrangement of the rotating shaft 4 and its internal guide hole 5, the continuously drawn-in air is filtered by the cleaning mechanism 2 and adsorbed by the adsorption bushing 62 inside the guide hole 5. This ensures that the water vapor in the air is further adsorbed, preventing water vapor from entering the throttle valve, improving the dryness of the gas, and ensuring the quality of the air drawn in by the throttle valve.

[0027] The mounting ring 1 is connected to at least three evenly distributed fastening components 7. The front end of the fastening component 7 is connected to the cleaning mechanism 2 through the mounting ring 1, and the rear end of the fastening component 7 is connected to the throttle valve through the mounting ring 1.

[0028] Among them, the front of the collection plate 61 is fixedly connected to a guide ball 63 located between multiple through holes. The outer surface of the guide ball 63 is a spherical smooth arc surface. The front of the guide ball 63 is provided with a connection hole 64. The back of the front end of the cleaning mechanism 2 is connected to the connection hole 64. Because of the replacement component 6, it is not only easier to achieve further adsorption and purification effects, but also to prevent a small amount of salt mist after air filtration from entering and corroding the inner wall of the guide hole 5, which could lead to blockage of the guide hole 5 and poor air intake over time.

[0029] The cleaning mechanism 2 includes a connecting plate 22 that fits against the front of the mounting ring 1 and the rotating shaft 4. A cleaning component 21 is fixedly connected to the front of the connecting plate 22. A capping component 23 is connected to the front end of the cleaning component 21. The back of the capping component 23 is connected to the connecting hole 64.

[0030] The cover assembly 23 includes a cover plate 231 that fits against the front of the cleaning assembly 21. A sealing plate 232 that is sealed and threaded onto the back of the cover plate 231 is attached to the front end of the cleaning assembly 21. A positioning shaft 233 is fixedly connected to the back of the cleaning assembly 21. The rear end of the positioning shaft 233 is movably inserted into the interior of the connection hole 64.

[0031] The cleaning component 21 includes a protective cover 211 clamped between the cover plate 231 and the connecting plate 22, and an air inlet 3 is opened at the bottom of the protective cover 211 and is tangentially connected to the bottom of the filter chamber 212. The protective cover 211 has a filter chamber 212 on the front, and the filter chamber 212 is filled with a filter element 213, which is made of water-absorbing material.

[0032] The protective cover 211 has a centrifugal cleaning mechanism located outside the replacement component 6, which includes a centrifugal component and a flow guiding component. The centrifugal assembly consists of a linkage ring 214 coaxially sleeved between the protective cover 211 and the guide ball 63 and linkage blades 215 covering its outer surface. The linkage ring 214 has connecting grooves 216 that correspond one-to-one with the linkage blades 215 and are alternately distributed. The flow guiding assembly consists of a flow guiding cover 217 fitted inside the linkage ring 214, a first flow guiding port 218, and a second flow guiding port 219. The first flow guiding port 218 is located at the bottom of the flow guiding cover 217 and is formed by the extensions of both ends of the flow guiding cover 217 itself. The second flow guiding port 219 is opened at the top of the inner cavity of the protective cover 211 and is tangentially connected to the top of the filter cavity 212. The gas in the filter chamber 212 enters the space between the protective cover 211 and the linkage ring 214 through the second guide port 219, then enters the guide cover 217 through the first guide port 218 via the connecting groove 216, and finally enters the throttle valve through the adsorption bushing 62 in the guide hole 5. Due to the centrifugal component, in conjunction with the flow guide component, the centrifugal component that follows the rotating shaft 4 rotates with the intake air, giving the intake air centrifugal force, thereby throwing out tiny particles that are not intercepted by the filter element 213, and also facilitating the removal of micron-sized salt spray components, effectively improving the air quality entering the throttle valve.

[0033] Among them, the protective cover 211 is located inside the filter element 213 and is a water-absorbing liner that cooperates with the filter element 213 in the filter chamber 212. There is a gap between the outer side of the linkage blade 215 and the water-absorbing liner. The back of the linkage ring 214 is engaged with the front of the collection plate 61 and rotates synchronously. The front of the flow guide shroud 217 is engaged with the back of the cover plate 231 and remains stationary.

[0034] The fastening assembly 7 includes a connecting rod 73 sleeved inside the mounting ring 1. The front end of the connecting rod 73 extends into the interior of the cleaning mechanism 2 and is fixedly connected to a tightening positioning head 72 embedded in the back of the filter chamber 212. The front of the tightening positioning head 72 is provided with an adapter hole 74. The rear end of the connecting rod 73 extends to the rear of the mounting ring 1 and is fixedly connected to a locking shaft 71 tightened on the throttle valve. The adapter hole 74 is internally inserted into a short shaft that is compatible with it. The front end of the short shaft is fixedly connected to the back of the filter element 213. Due to the fastening assembly 7, the cleaning mechanism 2 and the mounting ring 1 can be easily fixed to the throttle intake end by the connecting rod 73, its two locking shafts 71 and the tightening positioning head 72; the fastening assembly 7 itself can be easily disassembled and assembled through the adapter hole 74; and the adapter hole 74 can also facilitate the positioning of the filter element 213 with the cooperation of the short shaft, ensuring that the two independent structures in the filter element 213 remain stable and are not pushed by the airflow.

[0035] Two baffles are embedded in the back of the inner cavity of the filter chamber 212. The two baffles are located at both ends of the air inlet 3 and communicate with the filter chamber 212. The rear end of the baffle is supported by a spring, and the front end of the baffle is supported by the back of the filter element 213. The filter element 213 consists of two identical independent structures, with the two ends of each structure located between the second guide port 219 and the air inlet 3, and respectively abutting against the front end of a corresponding baffle. Two snap-fit ​​plates 234 are also snapped onto the cover plate 231. The two snap-fit ​​plates 234 correspond one-to-one with two independent structures and are fixedly connected. With the cooperation of the mounting plate 234, it is easy to remove the corresponding independent structure in the filter element 213 at any time for disassembly, cleaning or replacement. After the independent structure is removed, the baffle at the corresponding end of the air inlet 3 is popped out and blocked by the spring, so that the airflow entering the air inlet 3 can only enter the second guide port 219 through another independent structure, ensuring the filtration of the filter element 213 and the cleaning and replacement without stopping the machine.

[0036] Working principle and usage process of this invention: As shown in the figure, first, seal the mounting ring 1 to the front end of the throttle body and calibrate the axis to ensure that the rear ends of all the guide holes 5 on the rotating shaft 4 are aligned with the air intake of the throttle body. Next, insert the adsorption bushing 62 into the corresponding guide hole 5, and ensure that the collection plate 61 is attached to the front end of the rotating shaft 4. Simultaneously, the linkage ring 214 completes installation following the assembly plate 61; Then the connecting plate 22 is pressed onto the front end of the mounting ring 1; Finally, the cleaning component 21, the connecting plate 22 and the mounting ring 1 are tightened to the front end of the throttle body by fastening component 7, and the second guide port 219 inside the protective cover 211 is in a top horizontal position. The front of the flow guide 217 is inserted into the cover plate 231 and locked together. Then, the positioning shaft 233 on the back of the cover plate 231 is inserted into the connecting hole 64. At the same time, the cover plate 231 is rotated to tighten the sealing plate 232 into the front end of the protective cover 211, while driving the flow guide 217 to rotate, so that the first flow guide port 218 on the flow guide 217 is in a bottom horizontal state. Finally, the two independent structures in the filter element 213 are inserted into the filter chamber 212 after passing through the cover plate 231 with the mounting plate 234, and the baffle is pushed into the protective cover 211. Finally, the mounting plate 234 is snapped onto the cover plate 231 so that the filter element 213 can be embedded into the filter chamber 212. After the engine is started, air is drawn in through the throttle valve. Under the negative pressure of the throttle valve, the airflow is supplemented into the throttle valve through the adsorption bushing 62 inside the guide hole 5 on the rotating shaft 4. During this period, the airflow entering the rotating shaft 4 is driven to rotate by the guide hole 5, which in turn drives the linkage ring 214 and the linkage blades 215 on its surface to rotate. The air drawn in is replenished through the air intake 3, the second guide hole 219 and the first guide hole 218. This creates a continuous inhalation airflow; The airflow enters the filter chamber 212 through the air inlet 3 and is filtered by the filter element 213. After passing through the second guide port 219, it enters the protective cover 211 and rotates with the linkage ring 214 and linkage blade 215. Then, it enters the guide cover 217 through the connecting groove 216 and the first guide port 218, and finally enters the throttle valve through the adsorption bushing 62 in the guide hole 5. When the air rotates with the linkage ring 214 and linkage blade 215, centrifugal force is generated, which causes the tiny salt spray particles in the air to be thrown out and adsorbed onto the water-absorbing lining inside the protective cover 211. After the machine stops, the salt particles on the water-absorbing liner are combined and thrown out, and the water adsorbed on the filter element 213 in the filter chamber 212 dissolves and flows along the filter chamber 212 to the air inlet 3 and is finally discharged. After a period of time, the corresponding independent structure in the filter element 213 is removed through the mounting plate 234 and cleaned or replaced. After removing this independent structure, the corresponding baffle is pushed under the action of the spring to block the passage between this part of the filter chamber 212 and the air inlet 3, so that air enters the second guide port 219 through another independent structure of the filter element 213, maintaining the filtration quality, thereby achieving the purpose of cleaning the filter element without stopping the machine.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An engine intake air filter cleaning device for an outboard motor, comprising a mounting ring (1), characterized in that: The mounting ring (1) is fixedly installed on the front of the engine throttle valve. A cleaning mechanism (2) is fixedly connected to the front of the mounting ring (1). An air inlet (3) is opened on the side of the cleaning mechanism (2). A rotating shaft (4) is rotatably sleeved inside the mounting ring (1). The rotating shaft (4) is covered with evenly distributed guide holes (5). A replacement component (6) is sleeved inside the guide holes (5). The front end of the replacement component (6) extends to the front of the mounting ring (1) and is pressed onto the mounting ring (1) by the cleaning mechanism (2). The replacement assembly (6) includes a collection plate (61) covering the front of the rotating shaft (4). Multiple adsorption bushings (62) are fixedly connected to the back of the collection plate (61). The adsorption bushings (62) correspond one-to-one with the guide holes (5) and are sleeved inside the corresponding guide holes (5). The collection plate (61) has through holes that communicate with the adsorption bushings (62). The collection plate (61) is pressed against the front end of the mounting ring (1) by the cleaning mechanism (2).

2. The engine intake air filtration and cleaning device for an outboard motor according to claim 1, characterized in that: The mounting ring (1) is connected to at least three evenly distributed fastening components (7). The front end of the fastening component (7) is connected to the cleaning mechanism (2) through the mounting ring (1), and the rear end of the fastening component (7) is connected to the throttle valve through the mounting ring (1).

3. The engine intake air filtration and cleaning device for an outboard motor according to claim 2, characterized in that: The front of the collection plate (61) is fixedly connected to a guide ball (63) located between multiple through holes. The outer surface of the guide ball (63) is a spherical smooth arc surface. A connection hole (64) is opened on the front of the guide ball (63). The back of the front end of the cleaning mechanism (2) is connected to the connection hole (64).

4. The engine intake air filtration and cleaning device for an outboard motor according to claim 3, characterized in that: The cleaning mechanism (2) includes a connecting plate (22) that fits against the front of the mounting ring (1) and the rotating shaft (4). A cleaning component (21) is fixedly connected to the front of the connecting plate (22). A capping component (23) is connected to the front end of the cleaning component (21). The back of the capping component (23) is connected to the connecting hole (64).

5. The engine intake air filtration and cleaning device for an outboard motor according to claim 4, characterized in that: The cover assembly (23) includes a cover plate (231) that fits against the front of the cleaning assembly (21). A sealing plate (232) that is sealed and threaded onto the back of the cover plate (231) is attached to the front end of the cleaning assembly (21). A positioning shaft (233) is fixedly connected to the back of the cleaning assembly (21). The rear end of the positioning shaft (233) is movably inserted into the interior of the connection hole (64). The outer surface of the positioning shaft (233) contacts the inner wall of the connection hole (64) through ball bearings.

6. The engine intake air filtration and cleaning device for an outboard motor according to claim 5, characterized in that: The cleaning assembly (21) includes a protective cover (211) sandwiched between a cover plate (231) and a connecting plate (22), and the air inlet (3) is located at the bottom of the protective cover (211) and is tangentially connected to the bottom of the filter chamber (212); The protective cover (211) has a filter chamber (212) on the front, and the filter chamber (212) is filled with a filter element (213), which is made of water-absorbing material.

7. The engine intake air filtration and cleaning device for an outboard motor according to claim 6, characterized in that: The protective cover (211) is provided with a centrifugal cleaning mechanism located outside the replacement component (6), including a centrifugal component and a flow guiding component; The centrifugal assembly consists of a linkage ring (214) coaxially sleeved between the protective cover (211) and the guide ball (63) and linkage blades (215) covering its outer surface. The linkage ring (214) has connecting grooves (216) that correspond one-to-one with the linkage blades (215) and are alternately distributed. The flow guiding assembly consists of a flow guiding cover (217) sleeved in the linkage ring (214), a first flow guiding port (218) and a second flow guiding port (219). The first flow guiding port (218) is located at the bottom of the flow guiding cover (217) and is formed by the extensions of both ends of the flow guiding cover (217) itself. The second flow guiding port (219) is opened at the top of the inner cavity of the protective cover (211) and is tangentially connected to the top of the filter cavity (212). The gas in the filter chamber (212) enters between the protective cover (211) and the linkage ring (214) through the second guide port (219), then enters the guide cover (217) through the first guide port (218) via the connecting groove (216), and finally enters the throttle valve through the adsorption bushing (62) in the guide hole (5).

8. The engine intake air filtration and cleaning device for an outboard motor according to claim 7, characterized in that: The protective cover (211) is located inside the filter element (213) and is a water-absorbing liner. It cooperates with the filter element (213) in the filter chamber (212). There is a gap between the outer side of the linkage blade (215) and the water-absorbing liner. The back of the linkage ring (214) is engaged with the front of the collection plate (61) and rotates synchronously. The front of the flow guide (217) is engaged with the back of the cover plate (231) and remains stationary.

9. The engine intake air filtration and cleaning device for an outboard motor according to claim 6, characterized in that: The fastening assembly (7) includes a connecting rod (73) sleeved inside the mounting ring (1). The front end of the connecting rod (73) extends into the interior of the cleaning mechanism (2) and is fixedly connected to a tightening positioning head (72) embedded in the back of the filter chamber (212). The front of the tightening positioning head (72) is provided with an adapter hole (74). The rear end of the connecting rod (73) extends to the rear of the mounting ring (1) and is fixedly connected to a locking shaft (71) screwed onto the throttle valve. The adapter hole (74) is internally inserted with a matching short shaft, the front end of which is fixedly connected to the back of the filter element (213).

10. The engine intake air filtration and cleaning device for an outboard motor according to claim 7, characterized in that: Two baffles are embedded in the back of the inner cavity of the filter chamber (212). The two baffles are located at the two ends of the air inlet (3) and communicate with the filter chamber (212). The rear end of the baffle is connected to a spring, and the front end of the baffle is against the back of the filter element (213). The filter element (213) consists of two identical independent structures, the two ends of which are located between the second guide port (219) and the air inlet (3) respectively, and abut against the front end of a corresponding baffle; Two mounting plates (234) are also snapped onto the cover plate (231), and the two mounting plates (234) correspond one-to-one with two independent structures and are fixedly connected.

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