Single-pipe middle exhaust type intake and exhaust device of engine

Abstract

The invention provides an engine single-pipe middle exhaust type air intake and exhaust device which comprises a shell, an air intake and exhaust pipe and an embedded pipe are arranged in the shell, the embedded pipe is arranged on the air intake and exhaust pipe in a sleeving mode, and a timing wheel is connected to the air intake and exhaust pipe in a sleeving mode; air inlet and exhaust openings which correspond to each other and main air exhaust openings which correspond to each other are formed in the shell and the embedded pipe; an air inlet, an exhaust port and an exhaust channel are formed in the air inlet and exhaust pipe, and the exhaust port is communicated with the exhaust channel; when the air inlet and outlet pipe rotates, the air inlet and the air outlet alternately coincide with the air inlet and outlet opening, and when the air outlet coincides with the air inlet and outlet opening, the air outlet channel coincides with the main air outlet opening. The double-cylinder engine is suitable for a double-cylinder engine, and the air inlet and the exhaust port alternately coincide with the air inlet and exhaust openings through rotation of the air inlet and exhaust pipe to achieve opening and closing of the air valve; parts such as an air valve and a spring are omitted, and abrasion and the failure rate are reduced; the power is stronger, and vibration and noise are eliminated; and higher engine rotating speed can be adapted.

Description

Technical Field

[0001] This invention relates to the field of engine intake and exhaust system technology, and specifically to an engine single-pipe central exhaust type intake and exhaust device. Background Technology

[0002] The existing inline twin-cylinder engine intake and exhaust systems are mainly of the following two types:

[0003] One type is the single camshaft type, which rotates the camshaft via a timing sprocket shaft. The camshaft has two protrusions, one for intake and one for exhaust. The intake protrusion opens the intake rocker arm, and the other end of the rocker arm presses down to open the intake valve, allowing air to enter. The spring returns, causing the intake valve to close. The exhaust protrusion opens the exhaust rocker arm, and the rocker arm presses down to open the exhaust valve, allowing air to exit. The spring returns, causing the exhaust valve to close.

[0004] Another type is the dual overhead camshaft type, where one timing sprocket drives the intake camshaft and the other timing sprocket drives the exhaust camshaft. The intake camshaft squeezes the intake valve crown to open the intake valve, and the spring returns to close the intake valve; the exhaust camshaft squeezes the exhaust valve crown to open the exhaust valve, and the spring returns to close the exhaust valve.

[0005] The intake and exhaust systems of the above inline twin-cylinder engines all have the following problems:

[0006] 1. Because it requires the reciprocating motion of the intake and exhaust valves through components such as cam mechanisms, it has many components, is prone to wear, and has a high failure rate.

[0007] 2. A strong spring is used to close the valve. When the valve is opened, the compression of the spring consumes the engine's own torque.

[0008] 3. The valve opens and closes by reciprocating up and down, which not only causes a lot of vibration and noise, but also makes it difficult for the valve spring to keep up with the speed at high speeds, which can easily cause the valve to collide with the piston (cylinder blow), limiting the engine to higher speeds. Summary of the Invention

[0009] The technical problems to be solved by this invention are: 1. How to reduce the failure rate; 2. How to reduce the power consumption of the engine by the intake and exhaust system itself; 3. How to reduce vibration and noise, avoid cylinder head gaskets, and improve the adaptability of the intake and exhaust system to high engine speeds.

[0010] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0011] This invention provides a single-pipe central exhaust type intake and exhaust device for an engine, including a housing, an intake and exhaust pipe and an embedded pipe inside the housing, the embedded pipe being sleeved on the intake and exhaust pipe, and a timing wheel being sleeved on the intake and exhaust pipe; the housing and the embedded pipe each have corresponding and overlapping intake and exhaust openings and corresponding and overlapping total exhaust openings; the intake and exhaust pipes have an intake port, an exhaust port and an exhaust passage, the exhaust port being connected to the exhaust passage; when the intake and exhaust pipes rotate, the intake port and exhaust port alternately overlap with the intake and exhaust openings, and when the exhaust port overlaps with the intake and exhaust openings, the exhaust passage overlaps with the total exhaust opening.

[0012] The beneficial effects of this invention are:

[0013] The timing wheel drives the intake and exhaust pipes to rotate, causing the intake and exhaust ports to alternately overlap with the intake and exhaust openings, thereby enabling the intake and exhaust system to open and close the valves.

[0014] 1. It eliminates 50% of the parts, such as cam mechanisms, springs, and swing arms, found in existing technologies, saving manufacturing costs and reducing wear and failure rates;

[0015] 2. By eliminating components such as valves and springs, the loss of engine power during the energy storage of elastic components is eliminated, resulting in more torque output, stronger power, and fuel saving.

[0016] 3. It eliminates vibration and noise caused by the reciprocating motion of parts;

[0017] 4. It avoids the situation where the inertia of the components hinders its own reciprocating motion, and even the inertia of the intake and exhaust pipes helps its rotation, thus adapting to higher engine speeds and supporting single-cylinder engines at speeds of over 20,000 rpm. Compared with the maximum speed of around 10,000 rpm for existing single-cylinder engines, it greatly improves the adaptability to high engine speeds and avoids cylinder head blow problems.

[0018] Based on the above technical solution, the present invention can be further improved as follows.

[0019] Furthermore, the intake and exhaust openings include a first intake and exhaust opening and a second intake and exhaust opening, and the total exhaust opening is located in the area between the first intake and exhaust opening and the second intake and exhaust opening;

[0020] The air inlet includes a first air inlet and a second air inlet, and the exhaust outlet includes a first exhaust outlet and a second exhaust outlet. The first air inlet and the first exhaust outlet are located at the same position along the axial direction of the air inlet and exhaust pipe and are offset along the circumferential direction of the air inlet and exhaust pipe. The second air inlet and the second exhaust outlet are located at the same position along the axial direction of the air inlet and exhaust pipe and are offset along the circumferential direction of the air inlet and exhaust pipe. The exhaust channel is located in the area between the first exhaust outlet and the second exhaust outlet of the air inlet and exhaust pipe.

[0021] When the intake and exhaust pipes rotate, the first intake port and the first exhaust port alternately coincide with the first intake and exhaust opening, and the second intake port and the second exhaust port alternately coincide with the second intake and exhaust opening. When the first exhaust port coincides with the first intake and exhaust opening or the second exhaust port coincides with the second intake and exhaust opening, the exhaust passage coincides with the total exhaust opening.

[0022] It is easy to apply to twin-cylinder engines, easy to install, and completes the intake and exhaust work through the same housing, intake and exhaust pipes, and embedded pipes. It occupies little space and has a compact structure.

[0023] Furthermore, the first air inlet and the second air inlet are 180° apart from each other along the circumference of the air intake and exhaust pipe, and the first exhaust port and the second exhaust port are 180° apart from each other along the circumference of the air intake and exhaust pipe; there are two exhaust channels, which are located on opposite side walls in the middle of the air intake and exhaust pipe respectively.

[0024] During the process of air intake from the first intake port to the second intake port, and from the second intake port to the first intake port, the intake and exhaust pipes rotate exactly half a turn. This allows the stroke time difference between the two cylinders of the twin-cylinder engine to be compensated, facilitating the driving of the same crankshaft, resulting in smooth operation, low vibration, high top speed, and rapid acceleration. With two exhaust channels, when either the first or second exhaust port coincides with the intake or exhaust port, it can be ensured that at least one exhaust channel coincides with the main exhaust port, resulting in good exhaust performance.

[0025] Furthermore, the first air inlet and the first exhaust outlet are located within the circumferential 0° to 180° range of the intake and exhaust pipes, while the second air inlet and the second exhaust outlet are located within the circumferential 180° to 360° range of the intake and exhaust pipes.

[0026] By arranging the intake and exhaust ports of the two cylinders respectively in the semi-cylindrical area on one side of the intake and exhaust pipes, there is a sufficiently long time interval between the intake and exhaust of the two cylinders during operation, which facilitates the complete combustion of the gas and achieves the effect of saving fuel.

[0027] Furthermore, the first exhaust port and the exhaust channel are offset from each other along the circumference of the intake and exhaust pipes, and the second exhaust port and the exhaust channel are offset from each other along the circumference of the intake and exhaust pipes; the first intake and exhaust openings and the total exhaust opening are offset from each other along the circumference of the inlaid pipe, and the second intake and exhaust openings and the total exhaust opening are offset from each other along the circumference of the inlaid pipe.

[0028] This design allows the main exhaust opening on the housing to be positioned away from the side where the first and second intake / exhaust openings are located, facilitating the installation of the cylinder and engine exhaust pipe and avoiding structural interference.

[0029] Furthermore, the housing is provided with air intake pipes on opposite sides, with the two air intake pipes facing the two ends of the air intake and exhaust pipes respectively.

[0030] It is easy to connect to the external engine's fuel supply system, electronic fuel injector, or carburetor, and is easy to install.

[0031] Furthermore, one end of the intake pipe is movably fitted with an inlaid ring, which is fixed inside the housing; the timing wheel is located between the inlaid ring and the inlaid pipe.

[0032] The inlaid ring can be made of alloy material, which can reduce the frictional resistance of the intake and exhaust pipe rotation and make the rotation smooth. One end of the inlaid ring extends into the housing and is fitted onto the intake and exhaust pipe, which increases the oil and gas leakage path, reduces leakage, and allows the leaked trace oil and gas to enter the housing for easy collection and treatment.

[0033] Furthermore, the timing wheel is exposed on opposite sides of the housing, and a sprocket cover is provided on one of the opposite sides of the housing, covering the exposed portion of the timing wheel; the sprocket cover is provided with an exhaust gas pipe.

[0034] The timing wheel is integrated into the space inside the housing, resulting in a compact structure. It facilitates connection of the timing wheel via a chain, and one side of the timing wheel is covered by a sprocket cover to prevent mechanical damage and improve safety. The exhaust pipe can be used to connect to the air filter, making it easy to collect oil and gas mixtures leaking between the embedded ring and the intake and exhaust pipes, and between the embedded pipe and the intake and exhaust pipes, facilitating recycling and improving environmental friendliness.

[0035] Furthermore, one end of the air intake pipe is provided with a flange, which is fixedly connected to the housing; the air intake pipe is a bent pipe.

[0036] The air intake pipe is detachable, easy to install, occupies little space, and has low maintenance costs; in addition, the flange can achieve a seal between the air intake pipe and the housing to prevent leakage.

[0037] Furthermore, the housing is also provided with a spark plug, and each intake and exhaust opening of the housing is provided with an ignition port on one side, which is connected to the ignition end of a corresponding spark plug.

[0038] During installation, the ignition end of the spark plug is located inside the cylinder, which facilitates ignition. It has a compact structure and is easy to install. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the first axial side of the present invention.

[0040] Figure 2 This is a schematic diagram of the second axial side of the present invention.

[0041] Figure 3 This is a schematic diagram of the shell structure.

[0042] Figure 4 This is a schematic diagram of the intake and exhaust pipe structure.

[0043] Figure 5 This is a schematic diagram of the embedded tube structure.

[0044] Figure 6 This is a schematic diagram of the intake manifold.

[0045] Figure 7 This is a schematic diagram of a structure with an embedded ring.

[0046] Figure 8 This is a schematic diagram of the sprocket cover.

[0047] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0048] 1-Housing; 2-Intake and exhaust pipes; 3-Inlaid pipe; 4-Timing wheel; 5-First intake and exhaust opening; 6-Second intake and exhaust opening; 7-Main exhaust opening; 8-First air intake; 9-First exhaust port; 10-Second air intake; 11-Second exhaust port; 12-Exhaust passage; 13-Intake pipe; 14-Inlaid ring; 15-Flange; 16-Sprocket cover; 17-Exhaust gas pipe; 18-Spark plug; 19-Ignition port. Detailed Implementation

[0049] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0050] See this invention Figure 1-8 .

[0051] This invention provides a single-pipe central exhaust type intake and exhaust device for an engine, including a housing 1. The housing 1 contains an intake and exhaust pipe 2 and an embedded pipe 3. The embedded pipe 3 is sleeved on the intake and exhaust pipe 2, and a timing wheel 4 is sleeved on the intake and exhaust pipe 2. The housing 1 and the embedded pipe 3 each have corresponding and overlapping intake and exhaust openings and corresponding and overlapping total exhaust openings 7. The intake and exhaust pipe 2 has an intake port, an exhaust port, and an exhaust passage 12, and the exhaust port is connected to the exhaust passage 12. When the intake and exhaust pipe 2 rotates, the intake port and the exhaust port alternately overlap with the intake and exhaust openings, and when the exhaust port overlaps with the intake and exhaust openings, the exhaust passage 12 overlaps with the total exhaust opening 7.

[0052] principle:

[0053] The housing 1 and the inlaid tube 3 do not move relative to each other. The air inlet and outlet openings on the housing 1 and the air inlet and outlet openings on the inlaid tube 3 correspond to and coincide with each other, so they can be regarded as the same opening, i.e., the same technical feature. Similarly, the total exhaust opening 7 on the housing 1 and the total exhaust opening 7 on the inlaid tube 3 correspond to and coincide with each other, so they can be regarded as the same opening, i.e., the same technical feature.

[0054] In the installed state, the housing 1 is fixed to the engine cylinder, and the cylinder covers the intake and exhaust openings on the housing 1. The intake and exhaust openings of the housing 1 and the engine cylinder form a combustion chamber. The timing wheel 4 is connected to the intake and exhaust drive components on the engine crankshaft to transmit rotational power to the intake and exhaust pipes 2. The intake port and exhaust port of the intake and exhaust pipes 2 are isolated from each other.

[0055] In operation, the air-fuel mixture enters from the intake side of the housing 1, which is also one end of the intake / exhaust pipe 2, and is driven to rotate by the timing wheel 4. When the intake port coincides with the intake / exhaust opening, the air-fuel mixture enters the combustion chamber from the intake port (intake stroke). The intake / exhaust pipe 2 continues to rotate, and during the period from when the intake port and the intake / exhaust opening are misaligned until the exhaust port has not yet moved to the intake / exhaust opening, this period provides sufficient time for cylinder compression and ignition (compression stroke and power stroke). When the exhaust port coincides with the intake / exhaust opening, and the exhaust passage 12 coincides with the main exhaust opening 7, the combustion gases are discharged sequentially from the intake / exhaust opening, the exhaust port, the exhaust passage 12, and the main exhaust opening 7 (exhaust stroke). The intake / exhaust pipe 2 continues to rotate, and when the intake port coincides with the intake / exhaust opening again, the next intake stroke of the working cycle begins, thus repeating the cycle to support the operation of the engine cylinders. As can be seen, preferably, on the same cross-section of the intake and exhaust pipes 2, the intake port and the exhaust port each occupy 45° of the intake and exhaust pipes 2, with a pipe wall area of ​​45° on one side (corresponding to the time period from the exhaust stroke to the intake stroke) and a pipe wall area of ​​225° on the other side (corresponding to the compression stroke and the power stroke), totaling 360° of the intake and exhaust pipes 2.

[0056] In another embodiment, the intake and exhaust directions can be reversed from the above working state. The structure of the present invention remains unchanged, only the usage is slightly different. In this case, the conventional thinking of the technical feature prefix "intake and exhaust" should be ignored according to the principle of equality, and it should be included in the scope of protection of the present invention.

[0057] Another usage: The air-fuel mixture enters through the main exhaust port 7 and is driven by the timing wheel 4 to rotate the intake and exhaust pipes 2. When the exhaust port coincides with the intake and exhaust ports, and the exhaust passage 12 coincides with the main exhaust port 7, the air-fuel mixture enters the combustion chamber sequentially from the main exhaust port 7, the exhaust passage 12, the exhaust port, and the intake and exhaust ports (intake stroke); the intake and exhaust pipes 2 continue to rotate, and the time when the exhaust port and the intake and exhaust ports are misaligned, and the time when the exhaust passage 12 and the main exhaust port 7 are misaligned, provides sufficient time for the cylinder compression and ignition (compression stroke and power stroke); the intake and exhaust pipes 2 continue to rotate, and when the intake port coincides with the intake and exhaust ports, the combustion flue gas is discharged sequentially from the intake and exhaust ports, the intake port, and one end of the intake and exhaust pipes 2 (exhaust stroke).

[0058] Note: The exhaust port is connected to the exhaust passage 12, and the intake port is connected to the end of the intake and exhaust pipe 2. Preferably, the intake and exhaust pipe 2 is equipped with a baffle plate located between the intake port and the exhaust port, separating the intake port and the exhaust port. The baffle plate is arranged at an angle, that is, the baffle plate forms an angle with the axis of the intake and exhaust pipe 2, so that the internal passage from the end of the intake and exhaust pipe 2 to the intake port gradually narrows, and the internal passage from the exhaust port to the exhaust passage 12 gradually widens; thereby reducing the resistance of the oil-air mixture flowing from the intake and exhaust pipe 2 to the intake port, and reducing the resistance of the exhaust gas entering the interior of the intake and exhaust pipe from the exhaust port and flowing to the exhaust passage 12. When the engine is running at high speed, the speed of providing the oil-air mixture and the exhaust speed are faster, and the fuel supply and exhaust efficiency is higher.

[0059] This invention is suitable for use in single-cylinder or inline twin-cylinder engines. When applied to a twin-cylinder engine, it has two intake and exhaust ports (first intake / exhaust port 5, second intake / exhaust port 6), two intake ports (first intake port 8, second intake port 10), and two exhaust ports (first exhaust port 9, second exhaust port 11). Furthermore, this invention can also be used to simultaneously control the intake and exhaust of two single-cylinder engines or two inline twin-cylinder engines. Detailed structure and usage are described in detail below.

[0060] In summary, by employing this invention, the timing wheel 4 drives the intake and exhaust pipes 2 to rotate, causing the intake and exhaust ports to alternately overlap with the intake and exhaust openings, thereby realizing the opening and closing of the valves in the intake and exhaust system. 1. It eliminates 50% of the components such as cam mechanisms, springs, and rocker arms found in existing technologies, saving manufacturing costs and reducing wear and failure rates; 2. It eliminates valves, springs, and other components, eliminating the energy loss to the engine during energy storage in elastic components, achieving greater torque output, stronger power, and fuel efficiency; 3. It eliminates vibration and noise caused by the reciprocating motion of components; 4. It avoids the inertia of components hindering their reciprocating motion, and even the inertia of the intake and exhaust pipes 2 assists in their rotation, thus enabling them to adapt to higher engine speeds, supporting single-cylinder engines at speeds above 20,000 rpm. Compared to the maximum speed of approximately 10,000 rpm for existing single-cylinder engines, this significantly improves the adaptability to high engine speeds and avoids cylinder head gasket problems.

[0061] Furthermore, such as Figure 1-5 As shown: The intake and exhaust openings include a first intake and exhaust opening 5 and a second intake and exhaust opening 6, and the total exhaust opening 7 is located in the area between the first intake and exhaust opening 5 and the second intake and exhaust opening 6;

[0062] The air inlet includes a first air inlet 8 and a second air inlet 10, and the exhaust outlet includes a first exhaust outlet 9 and a second exhaust outlet 11. The first air inlet 8 and the first exhaust outlet 9 are located at the same axial position in the intake and exhaust pipe 2 and are offset from each other circumferentially along the intake and exhaust pipe 2. The second air inlet 10 and the second exhaust outlet 11 are located at the same axial position in the intake and exhaust pipe 2 and are offset from each other circumferentially along the intake and exhaust pipe 2. The exhaust channel 12 is located in the area between the first exhaust outlet 9 and the second exhaust outlet 11 in the intake and exhaust pipe 2.

[0063] When the intake and exhaust pipe 2 rotates, the first intake port 8 and the first exhaust port 9 alternately coincide with the first intake and exhaust opening 5, and the second intake port 10 and the second exhaust port 11 alternately coincide with the second intake and exhaust opening 6. When the first exhaust port 9 coincides with the first intake and exhaust opening 5 or the second exhaust port 11 coincides with the second intake and exhaust opening 6, the exhaust passage 12 coincides with the total exhaust opening 7.

[0064] Note: Circumferentially offset means not on the same generatrix. The first air intake / exhaust opening 5 on the housing 1 and the first air intake / exhaust opening 5 on the inlaid tube 3 correspond to and coincide with each other, so they can be regarded as the same opening, i.e., the same technical feature. The second air intake / exhaust opening 6 on the housing 1 and the second air intake / exhaust opening 6 on the inlaid tube 3 correspond to and coincide with each other, so they can be regarded as the same opening, i.e., the same technical feature.

[0065] During installation, the housing 1 is fixed to the engine cylinder, with one cylinder covering the first intake and exhaust opening 5 and the other cylinder covering the second intake and exhaust opening 6, thus forming two independent combustion chambers for the cylinders. During operation, the air-fuel mixture enters from both sides of the housing 1, which are also the two ends of the intake and exhaust pipes 2. The two cylinders operate on the same principle: when the first intake port 8 coincides with the first intake and exhaust opening 5, the air-fuel mixture at one end of the intake and exhaust pipes 2 enters the first combustion chamber from the first intake port 8; when the first exhaust port 9 coincides with the first intake and exhaust opening 5, and at the same time, the exhaust passage 12 coincides with the total exhaust opening 7, the combustion gases are discharged sequentially from the first intake and exhaust opening 5, the first exhaust port 9, the exhaust passage 12, and the total exhaust opening 7, completing the stroke of the first cylinder. When the second intake port 10 coincides with the second intake and exhaust port 6, the oil-air mixture at the other end of the intake and exhaust pipe 2 enters the second combustion chamber from the second intake port 10; when the second exhaust port 11 coincides with the second intake and exhaust port 6, and at the same time the exhaust passage 12 coincides with the main exhaust port 7, the combustion flue gas is discharged sequentially from the second intake and exhaust port 6, the second exhaust port 11, the exhaust passage 12, and the main exhaust port 7, completing the stroke of the second cylinder.

[0066] It is easy to apply to inline twin-cylinder engines, easy to install, and completes the intake and exhaust work through the same housing 1, intake and exhaust pipes 2, and embedded pipes 3. It occupies little space and has a compact structure.

[0067] Furthermore, such as Figure 4-5 As shown: the first air inlet 8 and the second air inlet 10 are spaced 180° apart from each other along the circumference of the air intake and exhaust pipe 2, and the first exhaust port 9 and the second exhaust port 11 are spaced 180° apart from each other along the circumference of the air intake and exhaust pipe 2; there are two exhaust channels 12, which are located on opposite side walls in the middle of the air intake and exhaust pipe 2 respectively.

[0068] During the process of air intake from the first intake port 8 to the second intake port 10, and during the process of air intake from the second intake port 10 to the first intake port 8, the intake and exhaust pipes 2 rotate exactly half a turn. This facilitates the complementary stroke time difference between the two cylinders of the twin-cylinder engine, making it easier to drive the same crankshaft, resulting in smooth operation, low vibration, high top speed, and fast acceleration. Through the two exhaust channels 12, when the first exhaust port 9 or the second exhaust opening coincides with the intake and exhaust openings, it can be ensured that one exhaust channel 12 coincides with the total exhaust opening 7, resulting in good exhaust effect.

[0069] Furthermore, such as Figure 4-5 As shown: the first air inlet 8 and the first exhaust outlet 9 are located in the circumferential 0° to 180° area of ​​the intake and exhaust pipe 2, and the second air inlet 10 and the second exhaust outlet 11 are located in the circumferential 180° to 360° area of ​​the intake and exhaust pipe 2.

[0070] When the intake and exhaust pipes 2 rotate in the same direction ( Figure 4 (Rotating from bottom to top in the orientation), working sequence: the first cylinder's first air inlet 8 takes in air, the second cylinder's second exhaust port 11 exhausts air, the second cylinder's second air inlet 10 takes in air, the first cylinder's first exhaust port 9 exhausts air, and the first cylinder's first air inlet 8 takes in air.

[0071] By arranging the intake and exhaust ports of the two cylinders respectively in the semi-cylindrical area on one side of the intake and exhaust pipe 2, there is a sufficiently long time interval between the intake and exhaust of the two cylinders during operation, which facilitates the complete combustion of the gas and achieves the effect of saving fuel.

[0072] Furthermore, such as Figure 4-5 As shown: the first exhaust port 9 and the exhaust channel 12 are offset from each other along the circumference of the intake and exhaust pipe 2, and the second exhaust port 11 and the exhaust channel 12 are offset from each other along the circumference of the intake and exhaust pipe 2; the first intake and exhaust opening 5 and the total exhaust opening 7 are offset from each other along the circumference of the inlaid pipe 3, and the second intake and exhaust opening 6 and the total exhaust opening 7 are offset from each other along the circumference of the inlaid pipe 3.

[0073] This design allows the main exhaust opening 7 on the housing 1 to avoid the side where the first intake and exhaust opening 5 and the second intake and exhaust opening 6 are located, facilitating the installation of the cylinder and engine exhaust pipe and avoiding structural interference.

[0074] Furthermore, such as Figure 1 , 2As shown in Figure 6: The housing 1 is also provided with air intake pipes 13 on opposite sides, and the two air intake pipes 13 are respectively facing the two ends of the air intake and exhaust pipes 2.

[0075] It is easy to connect to the external engine's fuel supply system, electronic fuel injector, or carburetor, and is easy to install.

[0076] Furthermore, such as Figure 3 , 7 As shown: One end of the air intake pipe 13 is movably fitted with an inlaid ring 14, which is fixed inside the housing 1; the timing wheel 4 is located between the inlaid ring 14 and the inlaid pipe 3.

[0077] The inlaid ring 14 can be made of alloy material, which can reduce the frictional resistance of the intake and exhaust pipe 2 rotation and make the rotation smooth. One end of the inlaid ring 14 extends into the housing 1 and is sleeved on the intake and exhaust pipe 2, which increases the oil and gas leakage path, reduces leakage, and allows the leaked trace amount of oil and gas to enter the housing 1 for easy collection and treatment.

[0078] Furthermore, such as Figure 1 , 2 As shown in Figure 8: the timing wheel 4 is exposed on opposite sides of the housing 1, and a sprocket cover 16 is provided on one side of the opposite sides of the housing 1, covering the exposed part of the timing wheel 4; an exhaust pipe 17 is provided on the sprocket cover 16.

[0079] Note: The timing wheel 4 is exposed on opposite sides of the housing 1. That is, the housing is provided with a through groove, the timing wheel 4 is located in the through groove, and the two open ends of the through groove expose the timing wheel 4.

[0080] The timing wheel 4 overlaps with the space inside the housing 1, resulting in a compact structure. It is easy to connect the timing wheel 4 via a chain, and one side of the timing wheel 4 is covered by the sprocket cover 16, which avoids mechanical damage and improves safety. The exhaust pipe 17 can be used to connect the air filter, which facilitates the collection of oil and gas mixtures leaked between the embedded ring 14 and the intake and exhaust pipes 2, and between the embedded pipe 3 and the intake and exhaust pipes 2, making it easy to recycle and improve environmental protection.

[0081] Furthermore, such as Figure 1 , 2 As shown in Figure 6: One end of the air intake pipe 13 is provided with a flange 15, and the flange 15 is fixedly connected to the housing 1; the air intake pipe 13 is a bent pipe.

[0082] The air intake pipe 13 is detachable, easy to install, occupies little space, and has low maintenance costs; and the flange 15 can achieve a seal between the air intake pipe 13 and the housing 1 to prevent leakage.

[0083] Furthermore, such as Figure 1-3As shown: The housing 1 is also provided with a spark plug 18, and each air intake and exhaust opening of the housing 1 is provided with an ignition port 19 on one side, and the ignition port 19 is connected to the ignition end of a corresponding spark plug 18.

[0084] During installation, the ignition end of spark plug 18 is located inside the cylinder, which facilitates ignition. It has a compact structure and is easy to install.

[0085] Based on the above embodiments, the present invention can also be applied to the intake and exhaust of V-type four-cylinder engines and horizontally opposed four-cylinder engines. This is because a V-type four-cylinder engine is equipped with two independent sets of inline twin-cylinder intake and exhaust devices; similarly, a horizontally opposed four-cylinder engine is also equipped with two independent sets of inline twin-cylinder intake and exhaust devices. Therefore, in addition to being applicable to ordinary inline twin-cylinder engines, the present invention can also be applied to V-type four-cylinder engines and horizontally opposed four-cylinder engines.

[0086] In the description of this invention, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this invention and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0087] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this invention, when descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixation," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral 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 refer to the internal communication of two components or the interaction between two components. "Fixation" can refer to integral fixation or detachable fixation using fasteners; it can be direct fixation or fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this invention can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0089] In this invention, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can 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. For those skilled in the art, the specific meaning of the above descriptive terms in this invention can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0090] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0092] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application.

Claims

1. A single-pipe, mid-section exhaust type intake and exhaust device for an engine, characterized in that: The device includes a housing (1), which contains an intake and exhaust pipe (2) and an inlaid pipe (3). The inlaid pipe (3) is fitted onto the intake and exhaust pipe (2), and a timing wheel (4) is fitted onto the intake and exhaust pipe (2). The housing (1) and the inlaid pipe (3) are provided with corresponding and overlapping intake and exhaust openings and corresponding and overlapping total exhaust openings (7). The intake and exhaust pipe (2) is provided with an air inlet, an exhaust outlet and an exhaust channel (12), and the exhaust outlet is connected to the exhaust channel (12). When the intake and exhaust pipe (2) rotates, the air inlet and the exhaust outlet alternately overlap with the intake and exhaust openings, and when the exhaust outlet overlaps with the intake and exhaust openings, the exhaust channel (12) overlaps with the total exhaust opening (7).

2. The engine single-pipe central exhaust type intake and exhaust device according to claim 1, characterized in that: The intake and exhaust openings include a first intake and exhaust opening (5) and a second intake and exhaust opening (6), and the total exhaust opening (7) is located in the area between the first intake and exhaust opening (5) and the second intake and exhaust opening (6); The air inlet includes a first air inlet (8) and a second air inlet (10), and the exhaust outlet includes a first exhaust outlet (9) and a second exhaust outlet (11). The first air inlet (8) and the first exhaust outlet (9) are located at the same position in the axial direction of the air inlet and exhaust pipe (2) and are offset along the circumference of the air inlet and exhaust pipe (2). The second air inlet (10) and the second exhaust outlet (11) are located at the same position in the axial direction of the air inlet and exhaust pipe (2) and are offset along the circumference of the air inlet and exhaust pipe (2). The exhaust channel (12) is located in the area between the first exhaust outlet (9) and the second exhaust outlet (11) of the air inlet and exhaust pipe (2). When the intake and exhaust pipe (2) rotates, the first intake port (8) and the first exhaust port (9) alternately coincide with the first intake and exhaust opening (5), the second intake port (10) and the second exhaust port (11) alternately coincide with the second intake and exhaust opening (6), and when the first exhaust port (9) coincides with the first intake and exhaust opening (5) or the second exhaust port (11) coincides with the second intake and exhaust opening (6), the exhaust passage (12) coincides with the total exhaust opening (7).

3. The engine single-pipe central exhaust type intake and exhaust device according to claim 2, characterized in that: The first air inlet (8) and the second air inlet (10) are spaced 180° apart from each other along the circumference of the air intake and exhaust pipe (2), and the first exhaust port (9) and the second exhaust port (11) are spaced 180° apart from each other along the circumference of the air intake and exhaust pipe (2); there are two exhaust channels (12), which are located on opposite side walls in the middle of the air intake and exhaust pipe (2).

4. The engine single-pipe central exhaust type intake and exhaust device according to claim 3, characterized in that: The first air inlet (8) and the first exhaust outlet (9) are located in the circumferential 0° to 180° area of ​​the air intake and exhaust pipe (2), and the second air inlet (10) and the second exhaust outlet (11) are located in the circumferential 180° to 360° area of ​​the air intake and exhaust pipe (2).

5. The engine single-pipe central exhaust type intake and exhaust device according to claim 3, characterized in that: The first exhaust port (9) and the exhaust channel (12) are offset from each other along the circumference of the intake and exhaust pipe (2), and the second exhaust port (11) and the exhaust channel (12) are offset from each other along the circumference of the intake and exhaust pipe (2); the first intake and exhaust opening (5) and the total exhaust opening (7) are offset from each other along the circumference of the inlaid pipe (3), and the second intake and exhaust opening (6) and the total exhaust opening (7) are offset from each other along the circumference of the inlaid pipe (3).

6. The engine single-pipe central exhaust type intake and exhaust device according to claim 2, characterized in that: The housing (1) is also provided with air intake pipes (13) on opposite sides, and the two air intake pipes (13) are respectively facing the two ends of the air intake and exhaust pipes (2).

7. The engine single-pipe central exhaust type intake and exhaust device according to claim 6, characterized in that: One end of the air intake pipe (13) is movably fitted with an inlaid ring (14), which is fixed inside the housing (1); the timing wheel (4) is located between the inlaid ring (14) and the inlaid tube (3).

8. The engine single-pipe central exhaust type intake and exhaust device according to claim 7, characterized in that: The timing wheel (4) is exposed on opposite sides of the housing (1). A sprocket cover (16) is provided on one side of the opposite sides of the housing (1). The sprocket cover (16) covers the exposed part of the timing wheel (4). An exhaust pipe (17) is provided on the sprocket cover (16).

9. The engine single-pipe central exhaust type intake and exhaust device according to claim 6, characterized in that: One end of the air intake pipe (13) is provided with a flange (15), and the flange (15) is fixedly connected to the housing (1); the air intake pipe (13) is a bent pipe.

10. The engine single-pipe mid-section exhaust type intake and exhaust device according to claim 1, characterized in that: The housing (1) is also provided with a spark plug (18), and each air intake and exhaust port of the housing (1) is provided with an ignition port (19) on one side, and the ignition port (19) is connected to the ignition end of a corresponding spark plug (18).

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