Noise reduction structure, air filter and secondary air supply system

Abstract

The noise reduction structure comprises a shell suitable for an air filter, a hose and a secondary air supplementing pipe nozzle, the shell is provided with a bent part, the bent part enables an inner cavity of the shell to form a first cavity and a second cavity, the size of the second cavity is larger than that of the first cavity, and the secondary air supplementing pipe nozzle is arranged on the shell and communicates with the first cavity; the hose is arranged in the first cavity, one end of the hose is communicated with the secondary air supplementing pipe nozzle, the other end of the hose extends in the direction from the first cavity to the second cavity, and a port of the other end of the hose extends into the second cavity. According to the technical scheme, the hose is arranged, so that the end opening of the secondary air supplementing pipe nozzle can be guided to the position with the shorter penetration distance, meanwhile, the expansion ratio is increased, and noise of the frequency band (medium-high frequency) corresponding to noise generated by secondary air supplementing is reduced advantageously through the shorter penetration distance and the larger expansion ratio. In addition, the original air filter shape does not need to be changed, so that the arrangement difficulty of the whole vehicle is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motorcycle engines, and in particular to a noise reduction structure, an air filter and a secondary air supply system. Background Art

[0002] With the development of motorcycle engine technology, in order to reduce the emission of atmospheric pollutants, a secondary air supply device is generally installed at a specific position of the engine's exhaust pipe. The device guides the fresh air in the air filter into the exhaust pipe to add more oxygen, so that the high-temperature incompletely burned combustible gas can fully produce an oxidation reaction to generate carbon dioxide and water vapor with less atmospheric pollution.

[0003] The secondary air supply device of the related technology mainly includes an air filter, a ventilation pipe, a solenoid valve and a one-way valve. When the pressure in the exhaust pipe is lower than the pressure upstream of the one-way valve, the one-way valve will open due to the negative pressure. At this time, fresh air will enter the exhaust pipe of the engine from the clean cavity of the air filter through the ventilation pipe.

[0004] However, in the conventional secondary air supply device, since the frequency of the exhaust pressure wave fluctuation is relatively high, the switching frequency of the one-way valve is also relatively high, which will cause pressure fluctuations of corresponding frequency inside the air filter, thereby generating airflow noise. Summary of the invention

[0005] Based on this, it is necessary to provide a noise reduction structure, an air filter and a secondary air supply system to address the problem of airflow noise generated in traditional secondary air supply devices.

[0006] In the first aspect, the present application provides a noise reduction structure, which includes a shell, a hose and a secondary air supply nozzle suitable for an air filter. The shell has a bending portion, which makes the inner cavity of the shell form a first cavity and a second cavity, and the volume of the second cavity is larger than the volume of the first cavity. The secondary air supply nozzle is arranged on the shell and connected with the first cavity. The hose is placed in the first cavity, and one end of the hose is connected with the secondary air supply nozzle, and the other end extends along the first cavity toward the second cavity, and the port at the other end of the hose extends all the way into the second cavity.

[0007] In the above technical solution, the present application sets a hose, which helps to guide the port of the secondary air supply nozzle to a position with a shorter penetration distance, and at the same time improves the expansion ratio. The shorter penetration distance and the larger expansion ratio are conducive to reducing the noise in the frequency band (medium and high frequency) corresponding to the noise generated by the secondary air supply. In addition, the present application does not need to change the original air filter shape, but only adds a hose, which makes little change to the structure of the air filter, does not affect the engine's performance, and reduces the difficulty of vehicle layout.

[0008] In some embodiments, the shell includes a detachable first shell and a second shell, the hose is installed on the side wall of the first shell, and the secondary air supply nozzle is correspondingly arranged on the first shell; or the hose is installed on the side wall of the second shell, and the secondary air supply nozzle is correspondingly arranged on the second shell.

[0009] In some embodiments, a hanging ear is provided on the side wall of the first shell or the side wall of the second shell, and the hanging ear is used to clamp the hose.

[0010] In some embodiments, the secondary air supply nozzle is provided with a first expansion opening, the hose passes through the first expansion opening, and one end of the hose is clamped to the inner wall of the secondary air supply nozzle.

[0011] In some embodiments, a second flared opening is provided at one end of the hose close to the secondary air supply nozzle, and the second flared opening is used to abut and cooperate with the first flared opening.

[0012] In some embodiments, the secondary air supply nozzle and the hose are interference fit, and a sealant is applied between the secondary air supply nozzle and the hose.

[0013] In the second aspect, the present application provides an air filter, including the above-mentioned noise reduction structure, the air filter also includes an air inlet pipe, an air outlet pipe and a filter element, the filter element is arranged in the second cavity, the shell is provided with an air inlet and an air outlet, the air inlet pipe is connected to the air inlet, and the air outlet pipe is connected to the air outlet.

[0014] In some embodiments, the shell includes a first shell and a second shell, both the first shell and the second shell are provided with an air outlet, and there are two air outlet pipes, which are respectively connected to the two air outlets.

[0015] On the third aspect, the present application provides a secondary air supply system, which includes the above-mentioned air filter, and also includes a first ventilation pipe, a solenoid valve, a second ventilation pipe, a one-way reed valve, an engine bumper exhaust duct and an exhaust pipe connected in sequence, and the end of the first ventilation pipe away from the solenoid valve is connected to the secondary air supply pipe nozzle.

[0016] In some embodiments, the first ventilation pipe is provided with an avoidance structure, which includes a first bent pipe and a second bent pipe connected in a bent manner, the first bent pipe is used to communicate with the secondary air supply pipe nozzle, and the second bent pipe is arranged between the two air outlet pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a secondary air supply system provided in some embodiments of the present application.

[0018] Figure 2 for Figure 1 A partial structural schematic diagram of an air filter in a secondary air supply system is shown.

[0019] Figure 3 for Figure 2 The partial structure of the air cleaner shown is a cross-sectional view taken along the axial direction of the breather pipe at point A.

[0020] Figure 4 A simplified structural diagram of a noise reduction structure provided in some embodiments of the present application.

[0021] Description of Figure Numbers

[0022] 10. Secondary air supply system; 100. Air filter; 110. Shell; 111. First shell; 112. Second shell; 110a. Bend; T1. First cavity; T2. Second cavity; 120. Hose; 121. Second expansion; 130. Secondary air supply nozzle; 131. First expansion; 140. Hanging ear; 150. Inlet pipe; 160. Outlet pipe; 170. Filter element; 200. First ventilation pipe; 210. Avoidance structure; 211. First bending pipe; 212. Second bending pipe; 300. Solenoid valve; 400. Second ventilation pipe; 500. One-way reed valve; 600. Engine bumper exhaust duct; 700. Exhaust pipe. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0029] In the field of motorcycle engine technology, if no relevant measures are taken during the engine exhaust process, some of the incompletely burned combustible gases in the engine combustion chamber will be discharged into the atmosphere at the same time and become air pollutants. In order to reduce the emission of air pollutants, fresh air from the air filter is generally introduced into the exhaust pipe of the engine to add more oxygen so that the high-temperature incompletely burned combustible gases can fully produce an oxidation reaction to generate carbon dioxide and water vapor with less air pollution.

[0030] The existing secondary air supply system generally includes an air filter, a ventilation pipe, a solenoid valve and a one-way valve. When the pressure in the exhaust pipe is lower than the pressure upstream of the one-way valve, the one-way valve will open due to the negative pressure. At this time, fresh air will enter the exhaust pipe of the engine from the clean cavity of the air filter through the ventilation pipe.

[0031] However, due to the exhaust characteristics of the engine, during the exhaust process of the engine, a constantly fluctuating exhaust pressure wave will be generated in the exhaust pipe. Since the frequency of the exhaust pressure wave fluctuation is high, the switching frequency of the one-way valve is also high, which will cause pressure fluctuations of the corresponding frequency inside the air filter, and then generate airflow noise. At this time, the air filter also acts as a silencer element in the secondary air supply system. If the silencer characteristics of the air filter are not designed reasonably, the silencer capacity for the airflow noise will be insufficient, causing the air filter to emit noise, reducing the quality of the motorcycle.

[0032] The air filter's ability to silence the noise generated by the secondary air supply is closely related to its shape. However, due to the limitations of the vehicle's space layout, the air filter sometimes needs to be designed into an irregular shape, such as the shape of the air filter in this application. Figure 1 In the structural schematic diagram of the secondary air supply system provided, the air filter is in an "L" shape, wherein the secondary air supply nozzle is designed at the front end of the air filter.

[0033] Figure 4 This is a simplified structural diagram of the noise reduction structure provided in some embodiments of the present application. Figure 4 Graph a in the figure is a simplified structural diagram without the hose 120 .

[0034] Combination Figure 4 As shown in a in the figure, the applicant has found through in-depth research that the front channel of the secondary air supply nozzle 130 in the air filter 100 is too narrow. When the noise during the secondary air supply is transmitted to the air filter 100 through the secondary air supply nozzle 130, the expansion ratio S2 / S1 is too small, which will lead to insufficient sound attenuation of the air filter 100. At the same time, the penetration distance L1 is too long, which is conducive to reducing low-frequency noise, but not conducive to reducing medium and high-frequency noise. The noise generated by the secondary air supply is mainly concentrated in the medium and high frequency bands, so it is manifested as abnormal noise that human ears will hear.

[0035] In order to solve the above problems, the inventors of the present application provide a noise reduction structure, an air filter 100 and a secondary air supply system 10. Figure 4 As shown in b, the present application sets a hose 120, which helps to guide the port of the secondary air supply nozzle 130 to the L2 position with a shorter penetration distance, and at the same time increases the expansion ratio to S3 / S1. The shorter penetration distance and the larger expansion ratio are conducive to reducing the noise in the frequency band (medium and high frequency) corresponding to the noise generated by the secondary air supply. Among them, the above-mentioned penetration distance refers to the distance that the gas passes through the filter element 170 in the cavity of the air filter 100. Generally speaking, the larger the penetration distance, the greater the noise generated by the air in the cavity of the air filter. S1 is the cross-sectional area of ​​the secondary air supply nozzle 130, and S2 and S3 are the cross-sectional areas of the corresponding positions respectively.

[0036] Figure 1 A schematic structural diagram of a secondary air supply system 10 provided in some embodiments of the present application.

[0037] Reference Figure 1 The secondary air supply system 10 provided in some embodiments of the present application includes an air filter 100, and also includes a first ventilation pipe 200, a solenoid valve 300, a second ventilation pipe 400, a one-way reed valve 500, an engine bar head exhaust duct 600 and an exhaust pipe 700 connected in sequence, and the end of the first ventilation pipe 200 away from the solenoid valve 300 is connected to the secondary air supply pipe nozzle 130.

[0038] When the pressure of the exhaust pipe 700 is lower than the upstream pressure of the one-way reed valve 500, the one-way reed valve 500 will open under the action of negative pressure. At this time, fresh air will be replenished into the exhaust pipe 700 from the air filter 100 through the first ventilation pipe 200, the solenoid valve 300, the second ventilation pipe 400, the one-way reed valve 500, and the engine bumper exhaust duct 600 in this order, thereby fully producing an oxidation reaction with the high-temperature incompletely burned combustible gas in the exhaust pipe 700 to generate carbon dioxide and water vapor with less atmospheric pollution.

[0039] When the pressure of the exhaust pipe 700 is greater than the pressure upstream of the one-way reed valve 500, the one-way reed valve 500 is closed to prevent exhaust gas from flowing back into the air filter 100. The solenoid valve 300 can be switched on and off by the onboard computer to control the working state of the secondary air supply system 10 according to different working conditions.

[0040] Figure 2 A partial structural schematic diagram of an air filter 100 provided in some embodiments of the present application. Figure 3 for Figure 2 The partial structure of the air cleaner 100 is shown in a cross-sectional view taken along the axial direction of the breather pipe at A.

[0041] Reference Figure 2The air filter 100 includes a noise reduction structure, and also includes an air inlet pipe 150 , an air outlet pipe 160 and a filter element 170 .

[0042] Combination Figure 2 and Figure 3 As shown, in some embodiments, the noise reduction structure includes a shell 110, a hose 120 and a secondary air supply nozzle 130. The shell 110 has a bending portion 110a. The bending portion 110a enables the inner cavity of the shell 110 to form a first cavity T1 and a second cavity T2, and the volume of the second cavity T2 is greater than the volume of the first cavity T1. The secondary air supply nozzle 130 is arranged on the shell 110 and is connected to the first cavity T1. The hose 120 is placed in the first cavity T1, and one end of the hose 120 is connected to the secondary air supply nozzle 130, and the other end extends along the first cavity T1 toward the second cavity T2, and the port at the other end of the hose 120 extends all the way to the second cavity T2.

[0043] In the above technical solution, the present application sets a hose 120, which helps to guide the port of the secondary air supply nozzle 130 to the L2 position with a shorter penetration distance, and at the same time increases the expansion ratio to S3 / S1. A larger expansion ratio is conducive to reducing the noise of the frequency band (medium and high frequency) corresponding to the noise generated by the secondary air supply. In addition, the present application does not need to change the shape of the original air filter 100, and only adds a hose 120, so that the structural change of the air filter 100 is small, does not affect the engine's performance, and reduces the difficulty of vehicle layout.

[0044] Continue to combine Figure 2 As shown, the filter element 170 of the air filter 100 is disposed in the second cavity T2, the housing 110 is provided with an air inlet and an air outlet, the air inlet pipe 150 is connected to the air inlet, and the air outlet pipe 160 is connected to the air outlet.

[0045] Combination Figure 1 and Figure 2 As shown, in some embodiments, the housing 110 includes a detachable first shell 111 and a second shell 112, so that the air filter 100 can be easily disassembled, assembled and repaired.

[0046] In some embodiments, the hose 120 is installed on the side wall of the first housing 111, and the secondary air supply nozzle 130 is correspondingly installed on the first housing 111; or the hose 120 is installed on the side wall of the second housing 112, and the secondary air supply nozzle 130 is correspondingly installed on the second housing 112, so that the position of the hose 120 can be reasonably arranged. Specifically, according to the layout of the whole vehicle, the installation position of the hose 120 can be adaptively adjusted, which helps to improve the compactness of the structure.

[0047] Optionally, in some embodiments, a lug 140 is provided on the side wall of the first housing 111 or the side wall of the second housing 112, and the lug 140 is used to clamp the hose 120, so that the two ends of the hose 120 can be fixed respectively through the lug 140 and the secondary air supply nozzle 130, so as to realize the reasonable arrangement of the hose 120. It can be understood that the hose 120 is installed on the side wall of the first housing 111 or the side wall of the second housing 112, and can be adaptively adjusted according to the structural arrangement requirements of the motorcycle.

[0048] Reference Figure 3 In some embodiments, the secondary air supply nozzle 130 is provided with a first flared opening 131, and the hose 120 passes through the first flared opening 131, and one end of the hose 120 is clamped to the inner wall of the secondary air supply nozzle 130, so as to fix one end of the hose 120. Specifically, the first flared opening 131 is provided to increase the size of the end opening of the secondary air supply nozzle 130, thereby facilitating the operation of the hose 120 passing through the secondary air supply nozzle 130.

[0049] Furthermore, in some embodiments, a second flared opening 121 is provided at one end of the hose 120 near the secondary air supply nozzle 130, and the second flared opening 121 is used to abut against the first flared opening 131, so that when the hose 120 passes through the secondary air supply nozzle 130 for assembly, the second flared opening 121 abuts against the first flared opening 131 to achieve assembly positioning of the hose 120, thereby preventing the assembly depth of the hose 120 from being too large. In addition, the second flared opening 121 is used to abut against the first flared opening 131, which helps to improve the fit between the secondary air supply nozzle 130 and the hose 120, prevent air leakage during the secondary air supply process, and ensure the secondary air supply effect.

[0050] Furthermore, in some embodiments, the secondary air supply nozzle 130 and the hose 120 are interference fit, and sealant is applied between the secondary air supply nozzle 130 and the hose 120 , which helps to further improve the sealing between the secondary air supply nozzle 130 and the hose 120 .

[0051] In some embodiments of the present application, the air filter 100 provided in the embodiments of the present application includes the noise reduction structure of the aforementioned embodiments.

[0052] In some embodiments, the air filter 100 provided in the embodiment of the present application includes a first shell 111 and a second shell 112, and both the first shell 111 and the second shell 112 are provided with an air outlet. The air filter 100 has two air outlet pipes 160, and the two air outlet pipes 160 are respectively connected to the two air outlets to meet the air outlet volume requirements.

[0053] In some embodiments of the present application, the secondary air supply system 10 provided in the embodiments of the present application includes the air filter 100 of the aforementioned embodiment.

[0054] In some embodiments, the first ventilation pipe 200 of the secondary air supply system 10 is provided with an avoidance structure 210, and the avoidance structure 210 includes a first bent pipe 211 and a second bent pipe 212 that are bent and connected. The first bent pipe 211 is used to communicate with the secondary air supply pipe nozzle 130, and the second bent pipe 212 is arranged between the two outlet pipes 160. This helps to make full use of the space between the two outlet pipes 160 to optimize the arrangement of the ventilation pipes and improve the rationality and compactness of the overall structural arrangement.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A noise reduction structure, characterized in that: The noise reduction structure includes a shell, a hose and a secondary air supply nozzle suitable for an air filter, the shell has a bending portion, and the bending portion enables the inner cavity of the shell to form a first cavity and a second cavity, and the volume of the second cavity is larger than the volume of the first cavity, the secondary air supply nozzle is arranged on the shell and is connected with the first cavity, the hose is placed in the first cavity, and one end of the hose is connected with the secondary air supply nozzle, and the other end extends along the first cavity toward the second cavity, so that the port at the other end of the hose extends all the way into the second cavity.

2. The noise reduction structure according to claim 1, characterized in that: The shell includes a detachable first shell and a second shell, the hose is installed on the side wall of the first shell, and the secondary air supply nozzle is correspondingly arranged on the first shell; or the hose is installed on the side wall of the second shell, and the secondary air supply nozzle is correspondingly arranged on the second shell.

3. The noise reduction structure according to claim 2, characterized in that: A hanging ear is arranged on the side wall of the first shell or the side wall of the second shell, and the hanging ear is used for clamping the hose.

4. The noise reduction structure according to claim 1, characterized in that: The secondary air supply nozzle is provided with a first expansion opening, the hose passes through the first expansion opening, and one end of the hose is clamped to the inner wall of the secondary air supply nozzle.

5. The noise reduction structure according to claim 4, characterized in that: A second flared opening is provided at one end of the hose close to the secondary air supply nozzle, and the second flared opening is used for abutting and matching with the first flared opening.

6. The noise reduction structure according to claim 4 or 5, characterized in that: The secondary air supply nozzle is interference fit with the hose, and sealant is applied between the secondary air supply nozzle and the hose.

7. An air filter, comprising the noise reduction structure according to any one of claims 1 to 6, characterized in that: The air filter also includes an air inlet pipe, an air outlet pipe and a filter element. The filter element is arranged in the second cavity. The shell is provided with an air inlet and an air outlet. The air inlet pipe is connected to the air inlet, and the air outlet pipe is connected to the air outlet.

8. The air filter according to claim 7, characterized in that: The shell includes a first shell and a second shell. The first shell and the second shell are both provided with the air outlet. There are two air outlet pipes, and the two air outlet pipes are respectively connected to the two air outlets.

9. A secondary air supply system, characterized in that: The secondary air supply system includes the air filter as described in claim 8, and also includes a first ventilation pipe, a solenoid valve, a second ventilation pipe, a one-way reed valve, an engine bar head exhaust duct and an exhaust pipe connected in sequence, and the end of the first ventilation pipe away from the solenoid valve is connected to the secondary air supply pipe nozzle.

10. The secondary air supply system according to claim 9, characterized in that: The first ventilation pipe is provided with an avoidance structure, which includes a first bent pipe and a second bent pipe connected in a bent manner. The first bent pipe is used to communicate with the secondary air supply pipe nozzle, and the second bent pipe is arranged between the two air outlet pipes.

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