An air filter structure capable of changing the engine air intake

Abstract

The utility model discloses an air filter structure that can change the engine air intake, characterized in that: including air filter body, air filter body upper portion is connected with air filter air pipe, and the lower part of air filter body is provided with engine air pipe, and the inside top of air filter body is air filter outside chamber, and the lower part is air filter internal chamber, and air filter outside chamber is linked with air filter air pipe, and engine air pipe is linked with air filter internal chamber, and the filter core is arranged between air filter outside chamber and air filter internal chamber, and the fixed pipe of horizontal arrangement is connected with the engine air pipe and is inserted into air filter internal chamber, and the telescopic pipe is sleeved and is slid on the fixed pipe, and the inlet end of telescopic pipe is located below the filter core, and the lower part of air filter body is provided with the drive arrangement that drives telescopic pipe horizontal movement. The utility model realizes that the internal pipeline is adjusted with the engine rotating speed dynamics, guarantees low speed steady air intake resistance and airflow smoothness.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle air filters, specifically to an air filter structure that can change the intake air volume of an engine. Background Technology

[0002] Motorcycle air filters are crucial components for ensuring clean engine intake air. They connect to the engine's air intake via a hose, filtering the air and delivering clean air to the engine. Currently, most traditional motorcycle air filters on the market use fixed-length rigid or semi-rigid hoses, resulting in poor speed adaptability. Engine speeds significantly vary the requirements for airflow resistance and smoothness in the intake system. Low-speed conditions (such as starting and climbing) require stable intake resistance and smooth airflow to avoid unstable torque output due to airflow fluctuations. High-speed conditions require reasonable control of intake resistance to balance power output and fuel economy. Fixed-length hoses cannot dynamically adjust the intake channel length according to engine speed. This leads to airflow turbulence at low speeds due to an excessively short intake path, resulting in resistance fluctuations exceeding ±15% and unstable torque output. At high speeds, the fixed intake path prevents the resistance from adapting to high-speed airflow characteristics, limiting power output and increasing fuel consumption.

[0003] To address the aforementioned issues, current technologies lack specific applications and employ conventional connecting hose structures, balancing high- and low-speed performance through adjustments. However, they cannot actively adjust the length based on engine speed, fundamentally resolving the intake compatibility problem at different speeds, and are particularly inadequate to meet the demands for stable intake resistance and smooth airflow at low speeds. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this utility model provides an air filter structure that can change the intake air volume of an engine. The structure is simple and the internal pipeline can be dynamically adjusted according to the engine speed (lengthened at low speed and shortened at high speed), ensuring stable intake resistance and smooth airflow at low speed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An air filter structure capable of adjusting engine intake air volume is characterized by comprising an air filter body, an air filter intake pipe connected to the upper part of the air filter body, an engine intake pipe disposed at the lower part of the air filter body, an outer air filter chamber at the upper part of the air filter body, and an inner air filter chamber at the lower part of the air filter body. The outer air filter chamber is connected to the air filter intake pipe, and the engine intake pipe is connected to the inner air filter chamber. A filter element is disposed between the outer air filter chamber and the inner air filter chamber. The engine intake pipe extends into the inner air filter chamber and is connected to a horizontally arranged fixed pipe. A telescopic pipe is slidably sleeved on the fixed pipe. The inlet end of the telescopic pipe is located below the filter element. The horizontal movement of the telescopic pipe is used to adjust the engine intake air volume. A drive device for driving the horizontal movement of the telescopic pipe is disposed at the lower part of the air filter body.

[0007] Furthermore, the driving device includes a lead screw and nut assembly and a drive motor. The lead screw and nut assembly and the drive motor are mounted on the air filter body. The output shaft of the drive motor is connected to one end of the lead screw of the lead screw and nut assembly. The lower end of the telescopic tube is limited and connected to the nut of the lead screw and nut assembly.

[0008] Furthermore, the drive motor is electrically connected to a motor drive module, which is electrically connected to the motorcycle ECU.

[0009] Furthermore, the telescopic tube has a double-layer structure, wherein the inner tube has a smooth and flat surface for extending into the fixed tube, and the outer tube is sleeved on the outside of the fixed tube. The outer tube has reinforcing ribs and limiting grooves distributed on it, and the front end of the fixed tube has a clip structure that cooperates with the limiting grooves.

[0010] The beneficial effects of this invention include: At low speeds, by lengthening the internal piping and extending the overall intake channel length, the airflow is fully buffered and stabilized within the channel, reducing the intake resistance fluctuation from ±15% of traditional fixed hoses to within ±5%, improving airflow smoothness by over 30%. Actual testing on a 150cc scooter showed a 3.7% improvement in power output stability below 6000rpm (climbing conditions) (the larger the displacement, the more significant the improvement), effectively solving the problem of unstable power at low speeds. At high speeds, shortening the internal piping and adapting the overall intake channel length to high-speed airflow characteristics reduces intake resistance by 15%-20%. Actual testing on a 150cc motorcycle showed a 4.8% power increase at 8000rpm (high-speed cruising conditions) (the larger the displacement, the more significant the improvement), while simultaneously reducing fuel consumption by 1.8%, balancing power and fuel efficiency. It adopts ECU linkage control, drive module and servo motor, with internal pipe length adjustment error ≤1mm and response time ≤0.3s. It can adapt to speed changes in real time (such as when increasing from 2000rpm to 4000rpm, the internal pipe length can be shortened from 220mm to 160mm in 0.5s), ensuring that the intake performance is always in the optimal state under different operating conditions. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of this utility model under high-speed conditions;

[0013] Figure 3 This is a schematic diagram of the telescopic tube structure of this utility model;

[0014] Figure 4 yes Figure 3 A sectional view;

[0015] Figure 5 This is a schematic diagram of the telescopic tube snap-fit ​​structure of this utility model;

[0016] Figure 6 This is a schematic diagram of the drive motor connection structure of this utility model. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] One such Figure 1-6The air filter structure shown includes an air filter body 1, an air filter intake pipe 2 connected to the upper part of the air filter body 1, an engine intake pipe 5 located at the lower part of the air filter body 1, an outer air filter chamber 3 at the upper part of the air filter body 1, and an inner air filter chamber 4 at the lower part of the air filter body 1. The outer air filter chamber 3 is connected to the air filter intake pipe 2, and the engine intake pipe 5 is connected to the inner air filter chamber 4. A filter element 6 is installed between the outer air filter chamber 3 and the inner air filter chamber 4. The engine intake pipe 5 extends into the inner air filter chamber 4 and is connected to a horizontally arranged fixed pipe 7. A telescopic pipe 8 is slidably sleeved on the fixed pipe 7. The inlet end of the telescopic pipe 8 is located below the filter element 6. The telescopic pipe 8 moves horizontally to adjust the engine intake volume. A drive device for driving the telescopic pipe 8 to move horizontally is provided at the lower part of the air filter body 1.

[0019] Furthermore, the drive device includes a lead screw and nut assembly 9 and a drive motor 10. The lead screw and nut assembly 9 and the drive motor 10 are mounted on the air filter body 1. The output shaft of the drive motor 10 is connected to one end of the lead screw of the lead screw and nut assembly 9. The lower end of the telescopic tube 8 is limited and connected to the nut of the lead screw and nut assembly 9.

[0020] Furthermore, the drive motor 10 is electrically connected to the motor drive module 11, which is electrically connected to the motorcycle ECU 12.

[0021] Furthermore, the telescopic tube 8 has a double-layer structure, with the inner tube having a smooth and flat surface for extending into the fixed tube, and the outer tube being sleeved on the outside of the fixed tube 7. The outer tube has reinforcing ribs and limiting grooves, and the front end of the fixed tube 7 has a clip structure that cooperates with the limiting grooves.

[0022] This invention provides a motorcycle air filter structure with a reciprocating telescopic connecting hose, comprising an air filter body, an internal telescopic pipe + external conventional hose combination structure, a speed-linked drive component, and a two-end docking structure, the specific structure of which is as follows:

[0023] ① Air Filter Body: Made of high-strength engineering plastic (PP + fiberglass), it is internally divided into two parts. The outer part connects to the atmosphere, and the inner part connects to the engine, separated by a filter element. The filter element is a paper filter (filtration efficiency ≥95%, dust holding capacity ≥5g). The pipe expansion chamber is located inside the air filter, accommodating the internal expansion pipe and the speed-linked drive assembly. The air filter body also has a standard interface for connecting to external traditional rubber hoses. This interface connects to the internal expansion pipe, ensuring a sealed and leak-free intake path.

[0024] ② "Internal telescopic tube + external traditional rubber hose" combined structure: The external traditional rubber hose completely retains the traditional air filter connection hose structure, using oil-resistant and aging-resistant materials, with the same length and diameter as the traditional hose (compatible with different vehicle models). Both ends connect to the air filter body and engine interface via standard clips, requiring no modification to the existing assembly method and compatible with mainstream motorcycles on the market. The internal telescopic tube is injection molded from food-grade polypropylene (PP) material and located inside the air filter, consisting of a fixed tube and a telescopic tube. One end of the fixed tube connects to the air filter outlet, and the other end extends inward and is bolted to the air filter. Multiple guide posts are provided on the outer wall to facilitate the reciprocating motion of the telescopic tube. The telescopic tube is designed with a U-shaped structure that completely fits onto the fixed tube. The inner side is for airflow, and the outer side has guide grooves to achieve directional reciprocating motion in conjunction with the guide posts of the fixed tube. A C-shaped mounting groove is also designed to connect with the screw and slider of the speed-linked drive component, ensuring a tube length of at least 100mm. The telescopic tube slides back and forth along the fixed tube to adjust the total length of the internal pipeline, achieving a telescopic stroke of 0-100mm, thereby changing the overall length of the air intake channel.

[0025] Speed-linked drive assembly: Connected to the motorcycle engine ECU (Electronic Control Unit), this assembly drives the reciprocating motion of the internal telescopic hose. It includes a micro servo motor, a lead screw mechanism, and a drive module. Specifically, the motor is mounted and fixed to the housing outside the air filter, with the lead screw directly inserted inside the air filter. The drive module receives engine speed signals from the ECU to control the rotation and position of the internal telescopic hose. Initially, the hose is at its longest position. When the speed exceeds 5000 rpm (high-speed operation; design variations may exist for different engines), the motor rotates, driving the sliding section to retract, shortening the hose (internal tubing shortens, overall air intake passage shortens). When the vehicle is off or idling, the motor resets, and the hose returns to its longest position. Screw mechanism: The screw is made of stainless steel (304), with a diameter of 6-8mm and a pitch of 1.5-2mm. One end is directly connected to the motor, and the other end is fixed to the air filter. Bearings prevent wear during movement. A slider is fitted on the screw, and the slider is threadedly connected to the telescopic tube of the internal telescopic pipeline. When the screw rotates, it drives the slider to move axially, thereby driving the telescopic tube to move. Control module: It presets the curve corresponding to "speed - internal pipeline length" (e.g., internal pipeline length 100mm and overall intake channel length 110mm at 2000rpm; internal pipeline length 100mm and overall intake channel length 250mm at 5000rpm). It controls the start, stop and direction of the motor in real time according to the engine speed signal fed back by the ECU, with a response time ≤0.3s, realizing dynamic adaptation.

[0026] ③ Two-end docking structure: On the air filter side, the internal telescopic pipe fixing section and the filter element cavity outlet adopt a docking structure. The external traditional clamp is used to directly connect the air filter body and the engine, which is completely consistent with the existing air filter assembly method (equipped with stainless steel hose clamp, clamping torque 8-10N·m). No new or modified fixing structure is required, ensuring assembly compatibility.

[0027] Structural principle:

[0028] 1. Speed ​​Recognition and Command Transmission: After the motorcycle is started, the engine ECU collects the speed signal in real time and transmits the signal to the control module of the speed linkage drive component; the control module determines the required overall intake channel length according to the preset "speed-internal pipeline length" curve and sends forward or reverse rotation command to the micro DC motor.

[0029] 2. Internal pipe length adjustment: After receiving the command, the motor starts and drives the lead screw to rotate; the slider on the lead screw drives the telescopic pipe of the internal telescopic pipe to slide back and forth along the guide groove of the fixed pipe:

[0030] 3. Low-speed operation: The motor rotates in the forward direction, and the slider drives the sliding section to move away from the fixed section. The length of the internal pipeline is increased (e.g., from the initial 120mm to 220mm). Combined with the length of the external traditional rubber hose (e.g., 100mm), the overall intake channel length is increased from 220mm to 320mm. By extending the intake path, the airflow is stabilized, the intake resistance fluctuation is controlled within ±5%, the airflow smoothness is improved by more than 30%, and the low-speed torque output is stable.

[0031] 4. High-speed operation: The motor rotates in reverse, and the slider moves the sliding section closer to the fixed section, shortening the internal pipe length (e.g., from 220mm to 120mm). The overall intake passage length is shortened from 320mm to 220mm, adapting to high-speed airflow characteristics and avoiding power loss caused by excessive intake resistance. At the same time, fuel consumption is reduced by 1%-5%. Because the engine's intake air demand increases at high speeds, the intake passage inner diameter, with its matching design, minimizes intake resistance and ensures stable and smooth airflow, resulting in better high-speed performance.

[0032] 5. Precision control and feedback: The stroke sensor detects the slider position in real time and feeds the position signal back to the control module; when the internal pipeline length reaches the preset value, the control module sends a stop command, the motor stops rotating, and ensures that the overall air intake channel length is accurately matched with the current speed; if the speed changes, the above process is repeated to achieve dynamic adjustment, and the external traditional hose always maintains a fixed length and assembly state, without affecting existing usage habits.

[0033] The beneficial effects of this utility model include: 1. Significantly improved low-speed intake stability: By lengthening the internal pipeline and extending the overall intake channel length at low speeds, the airflow is fully buffered and stabilized within the channel, reducing the intake resistance fluctuation range from ±15% of the traditional fixed rubber hose to within ±5%, and improving airflow smoothness by more than 30%; actual tests show that the power output stability of a 150cc scooter is improved by 3.7% at speeds below 6000rpm (climbing conditions) (the larger the displacement, the more obvious the improvement), effectively solving the problem of unstable power at low speeds.

[0034] 2. External structure is fully compatible with traditional assembly: The external connecting hose retains the traditional rubber material, length and assembly method, and is completely compatible with the existing motorcycle air filter hose. There is no need to modify the overall vehicle assembly design. It can directly replace the traditional air filter and is compatible with more than 90% of mainstream models on the market, reducing the difficulty of promotion and application.

[0035] 3. High-speed power and fuel economy balance: The internal pipeline is shortened at high speeds, and the overall intake channel length is adapted to the high-speed airflow characteristics, reducing intake resistance by 15%-20%. In actual tests, the power of a 150cc motorcycle increased by 4.8% at 8000rpm (high-speed cruising condition) (the larger the displacement, the more obvious the improvement), while fuel consumption was reduced by 1.8%, balancing the needs of power and energy saving.

[0036] 4. Balance between structural reliability and ease of maintenance: The internal telescopic tubing is made of PP material (compressive strength ≥20MPa, temperature range -40℃-120℃), and the structural service life can reach more than 5 years; the external hose is consistent with the traditional structure, and maintenance only requires disassembly, cleaning or replacement in the traditional way, without the need for additional learning of new operations, thus reducing maintenance costs.

[0037] 5. Precise and efficient control: It adopts ECU linkage control, drive module and servo motor, with internal pipeline length adjustment error ≤1mm and response time ≤0.3s. It can adapt to speed changes in real time (such as when increasing from 2000rpm to 4000rpm, the internal pipeline length can be shortened from 220mm to 160mm in 0.5s), ensuring that the intake performance is always in the optimal state under different operating conditions.

[0038] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An air filter structure capable of changing the intake air volume of an engine, characterized in that: The system includes an air filter body (1), an air filter intake pipe (2) connected to the upper part of the air filter body (1), an engine intake pipe (5) provided at the lower part of the air filter body (1), an outer air filter chamber (3) at the upper part of the interior of the air filter body (1), and an inner air filter chamber (4) at the lower part. The outer air filter chamber (3) is connected to the air filter intake pipe (2), and the engine intake pipe (5) is connected to the inner air filter chamber (4). A filter element (6) is provided between the air filter and the internal chamber (4). The engine intake pipe (5) extends into the internal chamber (4) of the air filter and is connected to a horizontally arranged fixed pipe (7). A telescopic pipe (8) is slidably sleeved on the fixed pipe (7). The inlet end of the telescopic pipe (8) is located below the filter element (6). The telescopic pipe (8) moves horizontally to adjust the engine intake volume. A drive device for driving the telescopic pipe (8) to move horizontally is provided at the lower part of the air filter body (1).

2. The air filter structure for changing engine intake air volume according to claim 1, characterized in that: The drive device includes a lead screw and nut assembly (9) and a drive motor (10). The lead screw and nut assembly (9) and the drive motor (10) are mounted on the air filter body (1). The output shaft of the drive motor (10) is connected to one end of the lead screw of the lead screw and nut assembly (9). The lower end of the telescopic tube (8) is limited and connected to the nut of the lead screw and nut assembly (9).

3. The air filter structure for changing engine intake air volume according to claim 2, characterized in that: The drive motor (10) is electrically connected to the motor drive module (11), and the motor drive module (11) is electrically connected to the motorcycle ECU (12).

4. The air filter structure for changing engine intake air volume according to claim 1, characterized in that: The telescopic tube (8) has a double-layer structure, with the inner tube having a smooth and flat surface for extending into the fixed tube, and the outer tube being sleeved on the outside of the fixed tube (7). The outer tube has reinforcing ribs and limiting grooves distributed on it, and the front end of the fixed tube (7) has a clip structure that cooperates with the limiting groove.

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