Internal combustion engine air inlet self-adaptive adjusting mechanism

Abstract

The utility model relates to the technical field of engine air filters, and discloses an internal combustion engine air inlet self-adaption adjusting mechanism which comprises an air inlet pipe and an air flow adjusting device, and the air flow adjusting device controls opening and closing of a high-speed air flow channel in the middle of the air inlet pipe. The negative pressure pipe is communicated with a flexible sealing structure, and the flexible sealing structure is connected with an airflow adjusting device. The structure is simple, the air inlet efficiency of the high-speed section and the low-speed section is improved, and the high-speed power performance and the low-speed power performance of a power system are brought into play.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine air cleaner, specifically relates to a self -adaptation adjusting mechanism of internal combustion engine air inlet. BACKGROUND

[0002] The air inlet of internal combustion engine can be provided with an air cleaner, and the air cleaner is an important performance component for providing clean air for the power system, removes dust, particulate matter and other impurities, and prevents pollutants from entering the combustion chamber, thereby protecting internal parts (such as cylinder, piston, valve, etc.) of the engine from wear or damage.

[0003] For example, a conventional internal combustion engine air inlet pipe, Chinese patent document CN218293733U discloses an air inlet pipe, which comprises a pipe body, a flow-through cavity is arranged in the pipe body for air to pass through, an air outlet section of the flow-through cavity is connected with an air inlet end of the air cleaner, a pollution discharge port is arranged on the bottom side of the pipe body and communicates with the flow-through cavity, and a spiral structure is arranged in the air inlet section of the flow-through cavity and used to make the air flowing through the spiral structure in a spiral trajectory, and the pollution discharge port is arranged on one side of the spiral structure close to the air outlet section. However, the conventional air cleaner layout is designed only according to the power characteristics of the internal combustion engine, and cannot meet the air inlet requirements of the low-speed and high-speed sections at the same time, thereby affecting the engine performance under low-speed and high-speed conditions.

[0004] Therefore, in order to solve the above problems, Chinese patent document CN222668283U discloses an air cleaner assembly, which comprises a housing forming an air cleaner chamber, a throttle body provided with a throttle drive, a first airflow pipe communicating between the throttle body and the air cleaner chamber, a second airflow pipe arranged in the air cleaner chamber, an auxiliary air inlet with an adjustable air inlet section arranged between the first airflow pipe and the second airflow pipe, and an adjusting mechanism for adjusting the size of the air inlet section of the auxiliary air inlet according to the opening size of the throttle body. The opening size of the throttle corresponds to the speed state of the engine, when the engine is in a low-speed state, the opening of the throttle is also in a small state, at this time, the adjusting mechanism adjusts the air inlet section of the auxiliary air inlet to be in a small or zero state, so that the air in the air cleaner chamber mainly passes through the second airflow pipe into the first airflow pipe, thereby making the air inlet route of the air in a long state, and further making the air form a good inertial airflow under the action of the second airflow pipe and the first airflow pipe, so that the air entering the engine has a high flow rate and can be fully mixed with fuel gas, thereby improving the low-speed performance of the engine.

[0005] The conventional internal combustion engine air inlet cannot simultaneously exhibit high-speed and low-speed air inlet efficiency and power performance of the power system, and the utility model solves this technical problem in a different way from the existing patent CN222668283U. Utility model content

[0006] The utility model discloses to solve how to play simultaneously power system high low speed section intake efficiency and power performance insufficient technical problem, provide a kind of internal combustion engine intake self-adapting adjustment mechanism, including intake pipe and airflow regulating device, the airflow regulating device controls the switch of high-speed airflow passage in the middle part of the intake pipe, it is characterized in that, the intake pipe is connected with negative pressure pipe, the negative pressure pipe is connected with flexible sealing structure, and the flexible sealing structure is connected with airflow regulating device.

[0007] Preferably, the flexible sealing structure is composed of a fixed frame and a flexible bowl, the negative pressure pipe is connected to the fixed frame, and the flexible bowl is connected to the airflow regulating device.

[0008] Preferably, the flexible bowl is a rubber skin bowl.

[0009] To facilitate reset while adjusting the switch of high-speed airflow passage according to the size of gas flow rate, an elastic member is provided in the flexible sealing structure, both ends of the elastic member are connected to the negative pressure pipe and the airflow regulating device respectively, the elastic member is in a non-compressed state under low speed, and in a compressed state under high speed, the required engine speed for opening the high-speed airflow passage can be changed according to the compression resistance of the elastic member, the stronger the compression resistance, the higher the required speed, and the lower the compression resistance, the smaller the required speed.

[0010] To facilitate control of the switch of high-speed airflow passage, the airflow regulating device includes an airflow regulating sleeve, an airflow regulating arm and a negative pressure driving rod, the airflow regulating sleeve is movably sleeved on the high-speed airflow passage of the intake pipe, one end of the airflow regulating arm is connected to the airflow regulating sleeve, the other end of the airflow regulating arm is connected to the negative pressure driving rod, the middle part of the airflow regulating arm is a fixed rotation point, and the negative pressure driving rod is connected to the flexible bowl and the elastic member.

[0011] To facilitate installation and manufacturing, the intake pipe is a tubular integral structure.

[0012] To facilitate air intake control, a throttle valve is provided in the intake pipe.

[0013] Preferably, the connection between the high-speed airflow passage and the negative pressure pipe is located on both sides of the throttle valve on the intake pipe.

[0014] The utility model has the following beneficial effects:

[0015] 1. In this invention, at high speed, the flexible cup contracts and drives the airflow regulating device to move to the left, opening the high-speed airflow channel. At low speed, the rubber cup recovers under the action of the spring and quickly drives the airflow regulating device to move to the right, closing the high-speed airflow channel. At low throttle, the power system uses a longer intake channel to fully utilize low-speed performance. When the user continues to pull the throttle, as the speed increases, the negative pressure in the intake channel increases sufficiently to overcome the spring force, opening the shorter high-speed intake channel to fully meet the high-speed power demand, thus achieving the goal of adaptively accommodating both high and low-speed intake needs. By adjusting the layout of air filter intake channels of different lengths and switching different airflow channels based on the negative pressure generated by different speeds, automatic switching between high and low-speed channels is achieved, realizing adaptive adjustment. The structure is simple, improving intake efficiency at both high and low speeds and maximizing the power system's high and low-speed performance.

[0016] 2. This utility model improves the control method by using the negative pressure brought by the gas flow rate to change the opening and closing of the high-speed airflow channel, so that the air intake pipe can be directly integrated into the overall structure without modification, making manufacturing and installation simpler. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the internal combustion engine intake adaptive adjustment mechanism of this utility model. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method:

[0019] The reference numerals in the accompanying drawings include: intake pipe 1, airflow regulating device 2, airflow regulating sleeve 201, airflow regulating arm 202, negative pressure drive rod 203, groove 204, air filter housing 3, air filter rear cavity 4, low-speed airflow channel 5, high-speed airflow channel 6, negative pressure pipe 7, flexible sealing structure 8, fixing frame 801, rubber cup 802, sealing cavity 803, spring 9, and throttle valve 10.

[0020] Example 1

[0021] like Figure 1 As shown, an internal combustion engine intake adaptive adjustment mechanism includes an intake pipe 1 and an airflow adjustment device 2. The intake pipe 1 is fixed on an air filter housing 3 and connected to the rear cavity 4 of the air filter. The intake pipe 1 itself is a low-speed airflow channel 5. A high-speed airflow channel 6 is provided in the middle of the intake pipe 1. The high-speed airflow channel 6 is also connected to the rear cavity 4 of the air filter. The airflow adjustment device 2 controls the opening and closing of the high-speed airflow channel 6 in the middle of the intake pipe 1. A negative pressure pipe 7 is connected to the intake pipe 1. The negative pressure pipe 7 is connected to the sealing cavity 803 of a flexible sealing structure 8. The flexible part of the flexible sealing structure 8 is connected to the airflow adjustment device 2.

[0022] The flexible sealing structure 8 is composed of a fixed frame 801 and a rubber cup 802. The space between the fixed frame 801 and the rubber cup 802 is a sealing cavity 803. The negative pressure pipe 7 is connected to the fixed frame 801. The fixed frame 801 is set on the air filter housing 3. The rubber cup 802 is connected to the airflow regulating device 2.

[0023] The flexible sealing structure 8 is equipped with a spring 9. The two ends of the spring 9 are respectively connected to the negative pressure pipe 7 and the airflow regulating device 2. In the low speed state, the spring 9 is in an uncompressed state. In the high speed state, the spring 9 is in a compressed state under the action of air pressure. The engine speed required when the high-speed airflow channel 6 is opened can be changed according to the compression resistance of the spring 9. The stronger the compression resistance, the higher the required speed, and the lower the compression resistance, the lower the required speed.

[0024] The airflow regulating device 2 includes an airflow regulating sleeve 201, an airflow regulating arm 202, and a negative pressure drive rod 203. The airflow regulating sleeve 201 is movably fitted onto the high-speed airflow channel 6 on the air intake pipe 1. One end of the airflow regulating arm 202 is connected to the groove 204 of the airflow regulating sleeve 201, and the other end is connected to the groove 204 of the negative pressure drive rod 203. The middle part of the airflow regulating arm 202 is fixed to the air filter housing 3 and serves as a rotation point. The middle part of the negative pressure drive rod 203 is movably mounted on the air filter housing 3, and the end of the negative pressure drive rod 203 is simultaneously connected to a rubber cup 802 and a spring 9. In high-speed mode, the rubber cup 802 contracts and drives the airflow regulating device 2 to move to the left, opening the high-speed airflow channel 6. In low-speed mode, the rubber cup 802 returns to its original position under the action of the spring 9 and quickly drives the airflow regulating device 2 to move to the right, closing the high-speed airflow channel 6.

[0025] The intake pipe 1 is a single tubular structure.

[0026] The intake pipe 1 is equipped with a throttle valve 10, and the high-speed airflow channel 6 and the negative pressure pipe 7 are respectively located on both sides of the throttle valve 10 on the intake pipe 1.

[0027] In the overall layout, the force value of the spring 9, the area and volume of each channel are adjusted according to the characteristics of the internal combustion engine. During user operation, at the low throttle stage, due to the relatively small negative pressure at low speed, the airflow regulating arm 202 causes the airflow regulating sleeve 201 and the airflow regulating arm 202 to stay in place due to the return action of the spring 9. At this time, the high-speed airflow channel 6 is closed, and the power system intake channel is a longer low-speed intake channel.

[0028] High-speed airflow channel 6 adjustment: When the throttle is greater than the preset opening, and the negative pressure in the rear chamber 4 of the throttle valve 10 is sufficient to overcome the force of the spring 9, due to the sealing effect of the rubber cup 802, the negative pressure drive rod 203 moves to the right to pull the airflow adjustment arm 202, and at the same time drives the airflow adjustment sleeve 201 to move to the left, gradually opening the high-speed airflow channel 6 until it is fully opened, thus opening the high-speed intake channel.

[0029] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An intake self-adapting mechanism of an internal combustion engine, comprising an intake pipe and a flow regulating device, said flow regulating device controlling the opening and closing of a high-speed flow passage in the middle of said intake pipe, characterized in that, The air inlet pipe is connected with a negative pressure pipe, the negative pressure pipe is connected with a flexible sealing structure, and the flexible sealing structure is connected with an air flow adjusting device.

2. The self-adapting intake mechanism of an internal combustion engine according to claim 1, characterized in that: The flexible sealing structure is composed of a fixed frame and a flexible bowl, the negative pressure pipe is connected with the fixed frame, and the flexible bowl is connected with the air flow adjusting device.

3. The self-adapting intake mechanism of an internal combustion engine according to claim 2, characterized in that: The flexible bowl is a rubber bowl.

4. The self-adapting intake mechanism of an internal combustion engine according to claim 3, characterized in that: An elastic member is arranged in the flexible sealing structure, two ends of the elastic member are connected with the negative pressure pipe and the air flow adjusting device respectively, the elastic member is in a non-compressed state in a low speed state, and the elastic member is in a compressed state in a high speed state.

5. The self-adapting intake mechanism of an internal combustion engine according to claim 4, characterized in that: The air flow adjusting device comprises an air flow adjusting sleeve, an air flow adjusting arm and a negative pressure driving rod, the air flow adjusting sleeve is movably sleeved on the high speed air flow passage of the air inlet pipe, one end of the air flow adjusting arm is connected with the air flow adjusting sleeve, the other end of the air flow adjusting arm is connected with the negative pressure driving rod, the middle part of the air flow adjusting arm is a fixed rotating point, and the negative pressure driving rod is connected with the flexible bowl and the elastic member.

6. The self-adapting intake mechanism of an internal combustion engine according to any one of claims 1 to 5, characterized in that: The air inlet pipe is a tubular whole structure.

7. The self-adapting intake mechanism of an internal combustion engine according to claim 6, characterized in that: A throttle valve is arranged in the air inlet pipe.

8. The self-adapting intake mechanism of an internal combustion engine according to claim 7, characterized in that: The high speed air flow passage is connected with the negative pressure pipe at two sides of the throttle valve on the air inlet pipe.

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