Variable-channel engine air inlet system and two-stroke engine

Abstract

The invention discloses a variable-channel engine air inlet system and a two-stroke engine, the variable-channel engine air inlet system comprises an air cylinder sleeve and an air inlet cavity, and the peripheral wall of the air cylinder sleeve is provided with a plurality of air inlets which are obliquely arranged at intervals in the circumferential direction; a plurality of flow guide air valves are arranged in the air inlet cavity, the flow guide air valves and the air cylinder sleeves are sequentially and alternately arranged in the air inlet cavity, the air inlet cavity is divided into two sub-cavities, at least two air inlet pipelines arranged at intervals in the circumferential direction are arranged on the circumferential wall of the air inlet cavity, and each sub-cavity is connected with at least one air inlet pipeline. The air inlet directions of the at least two air inlet pipelines are arranged along the inner circumferential wall of the air inlet cavity, and the included angles between the air inlet directions of the air inlets close to the inner circumferential wall of the air inlet cavity are smaller than 90 degrees. When air enters one air cylinder cavity, the flow guide air valve adjacent to the air cylinder cavity is opened, and the included angle between the airflow direction in the air inlet cavity and the air inlet direction of the air inlet is smaller than 90 degrees. The problem that the swirl ratio is low under the high flow coefficient of a traditional two-stroke engine is solved.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, and in particular to a variable-channel engine intake system and a two-stroke engine. Background Technology

[0002] Compared to four-stroke engines, two-stroke engines complete one power stroke per crankshaft revolution, resulting in higher torque, higher power output per liter, and superior performance. However, two-stroke engines also have inherent drawbacks: their intake and exhaust processes occur simultaneously, requiring intake air to remove exhaust gases from the cylinder, often leading to lower scavenging efficiency. Studies have shown that intake swirl can effectively improve scavenging efficiency, but enhancing the swirl (usually achieved by adjusting the intake port angle) often results in a decrease in the flow coefficient.

[0003] Currently, two-stroke engines typically employ single-channel or multi-channel same-side intake structures, which helps achieve uniform intake air distribution and maintain a high flow coefficient. However, increasing the swirl ratio still primarily relies on increasing the intake port angle, which leads to a decrease in the flow coefficient and consequently increases the turbocharger load. Furthermore, since each cylinder in a two-stroke engine receives air alternately during operation, the existing intake method suffers from a certain degree of energy excess, failing to fully utilize the energy carried by the intake airflow. Summary of the Invention The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a variable-channel engine intake system and a two-stroke engine, which can improve the vortex ratio while maintaining the same intake flow coefficient as existing two-stroke engines, thus solving the problem of low vortex ratio under high flow coefficients in traditional two-stroke engines.

[0004] This invention provides a variable-channel engine intake system, comprising: A cylinder liner is provided in multiple ways. The cylinder liner has a cylinder chamber inside. The peripheral wall of the cylinder liner has multiple air inlets arranged at intervals along the circumference. The air intake direction of the multiple air inlets is inclined along the same circumference of the cylinder liner. An intake chamber is provided with multiple air guide valves inside. The multiple air guide valves and multiple cylinder liners are arranged alternately in the intake chamber to divide the intake chamber into two sub-chambers. The intake chamber surrounds the outer periphery of the multiple cylinder liners. The air inlet connects the cylinder chamber and the intake chamber. The peripheral wall of the intake chamber is provided with at least two intake pipes arranged circumferentially at intervals. Each sub-chamber is connected to at least one intake pipe. The intake direction of the at least two intake pipes is respectively arranged along the inner peripheral wall of the intake chamber, and the angle between them and the intake direction of the air inlet near the inner peripheral wall of the intake chamber is less than 90 degrees. When one of the cylinder chambers is receiving air, the adjacent air guide valve is opened, so that the angle between the airflow direction in the intake chamber and the intake direction of the air inlet on the cylinder liner is less than 90 degrees.

[0005] The engine intake system according to embodiments of the present invention has at least the following beneficial effects: In use, this invention allows external air to enter the intake chamber through at least two intake pipes in different directions, and then flow into the cylinder chamber through an inclined intake port to form a vortex intake. When controlling the intake of different cylinder liners, the adjacent guide valve is opened to ensure that the airflow direction in the intake chamber is at an angle of less than 90 degrees to the flow direction of the intake port. This allows the airflow to flow along different channels within the intake chamber, maintaining consistency with the intake port's direction, ensuring that the inclination angle of each intake port fully utilizes its guiding effect, thereby maximizing the energy of the intake airflow. Furthermore, the intake pipes are arranged along the inner circumferential wall of the intake chamber, and the angle between them and the flow direction of the intake port adjacent to the inner circumferential wall is less than 90 degrees, ensuring that the intake airflow is consistent with the intake port direction, effectively reducing flow losses. Under the same inclination angle, this invention significantly improves the vortex ratio compared to traditional intake ducts. This invention achieves a higher vortex ratio than existing two-stroke engines with the same intake flow coefficient, solving the problem of low vortex ratio under high flow coefficients in traditional two-stroke engines.

[0006] As a further improvement to the above technical solution, a partition is provided inside the intake chamber, and partitions are respectively provided between the cylinder liners at both ends and the intake chamber, and a guide valve is provided between two adjacent cylinder liners.

[0007] As a further improvement to the above technical solution, the guide valve includes a valve and an opening and closing drive structure that drives the valve to rotate. The rotation axis of the valve is located at the center of the valve and is located at the center of two adjacent cylinder liners. The rotation axis of the valve is parallel to the axis of the cylinder liner.

[0008] As a further improvement to the above technical solution, the sum of the air intake cross-sectional areas of at least two of the air intake pipes is greater than or equal to 1.5 times the sum of the air intake cross-sectional areas of all the air intake ports.

[0009] As a further improvement to the above technical solution, the cylinder center distance between two adjacent cylinder liners is greater than or equal to 1.5 times the cylinder diameter of the cylinder liner.

[0010] As a further improvement to the above technical solution, multiple cylinder liners are arranged sequentially at intervals along a straight line.

[0011] As a further improvement to the above technical solution, the air intake direction of the intake pipe is arranged parallel to the circumferential tangential direction of the cylinder liner near the intake pipe.

[0012] As a further improvement to the above technical solution, the air intake direction of the intake pipe is set in the same direction as the arrangement direction of the plurality of cylinder liners.

[0013] As a further improvement to the above technical solution, the partition extends along the direction in which the plurality of cylinder liners are arranged.

[0014] Furthermore, the present invention also proposes a two-stroke engine, including the aforementioned engine intake system.

[0015] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the left-side cylinder liner intake of an engine intake system provided by the present invention. Figure 2 This is a schematic diagram of the control of cylinder liner intake in one embodiment of the engine intake system provided by the present invention. Figure 3 This is a schematic diagram of the right end of an embodiment of the engine intake system provided by the present invention, showing the control of the cylinder liner intake. Icon labels: Cylinder liner 100; intake port 110; cylinder chamber 120; Air intake chamber 200; air intake pipe 210; air guide valve 220; valve 221; sub-chamber 230; partition 240. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0019] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0022] Current two-stroke engine intake systems mostly employ single-channel or multi-channel intake on the same side. While this achieves good port uniformity and a high flow coefficient, obtaining a high swirl ratio requires adjusting the intake port angle by 110°, which also reduces the flow coefficient and increases the turbocharger load. Therefore, this invention proposes a variable-channel engine intake system. By controlling the intake of different cylinders, the airflow enters the intake chamber 200 through different flow channels. This system achieves a swirl ratio increase of over 95% while maintaining the same intake flow coefficient as existing two-stroke engines, solving the problem of low swirl ratio under high flow coefficients in traditional two-stroke engines.

[0023] like Figures 1 to 3 As shown, the engine intake system of the present invention includes: a cylinder liner 100 and an intake chamber 200.

[0024] Among them, the cylinder liner 100 has multiple components, such as... Figure 1 As shown, this embodiment provides three cylinder liners 100, and the cylinder liner 100 has a cylinder cavity 120 inside. The cylinder liner 100 in this embodiment extends axially in the front-to-back direction, and the three cylinder liners 100 are arranged sequentially at intervals along a straight line. The three cylinder liners 100 in this embodiment are arranged at intervals in the left-to-right direction. In some other embodiments, the cylinder liners 100 may adopt other arrangements.

[0025] The cylinder liner 100 has a plurality of air inlets 110 arranged at intervals along the circumference. The air intake direction of the plurality of air inlets 110 is inclined along the same circumference of the cylinder liner 100. It can be understood that the air inlets 110 are inclined on the circumference of the cylinder liner 100 according to a set angle. The air inlets 110 can be set with different angles to obtain intake vortices of different intensities.

[0026] In this embodiment, three cylinder liners 100 are arranged sequentially and spaced apart within the intake chamber 200, which surrounds the outer periphery of the three cylinder liners 100. The intake port 110 connects the cylinder chamber 120 and the intake chamber 200. The peripheral wall of the intake chamber 200 is provided with at least two intake pipes 210 spaced apart along the circumference. In this embodiment, two intake pipes 210 are provided. One intake pipe 210 is located at the lower left position of the intake chamber 200, and the airflow enters from the lower part of the intake chamber 200 from left to right, referred to as lower left intake. The other intake pipe 210 is located at the upper right position of the intake chamber 200, and the airflow enters from the upper part of the intake chamber 200 from right to left, referred to as upper right intake. The airflow enters the intake chamber 200 from two different directions through the two intake pipes 210.

[0027] In some other embodiments, the air intake duct 210 may be provided in three or four, etc.

[0028] Currently available air ducts all use single or dual intake pipes, with air entering the intake chamber 200 from a single direction. Because the intake port 110 is designed with an angle, the direction of the incoming airflow will have a certain angle with the direction of the port's tilt. In traditional intake pipes, after the airflow enters the intake chamber 200, half of the intake port 110 has an angle less than 90 degrees with the airflow in the intake pipe, while the other half has an angle much greater than 90 degrees. When the angle between the intake port 110 and the airflow in the intake pipe is much greater than 90 degrees, the inclination angle of the intake port 110 cannot effectively guide the airflow. In other words, only half of the intake port 110 can fully utilize its inclination angle for guidance, which makes it difficult to increase vortex volume.

[0029] In this embodiment, the two air intake pipes 210 are respectively arranged along the inner peripheral wall of the air intake chamber 200, and the angle between them and the air intake direction of the air inlet 110 near the inner peripheral wall of the air intake chamber 200 is less than 90 degrees. Figure 1 As shown, the angle between the air intake direction of the intake duct 210 and the air intake direction of the air inlet 110 near the inner peripheral wall of the intake chamber 200 is A, and the angle A is less than 90 degrees. This ensures that the airflow direction entering the intake duct 210 is consistent with the guidance of the air inlet 110, effectively reducing flow loss. At the same time, it can give full play to the guiding effect of the inlet 110 on the airflow. Under the same inlet angle conditions, it significantly improves the vortex ratio compared with the traditional air duct.

[0030] The intake chamber 200 in this embodiment is rectangular in shape, and the inner corners of the intake chamber 200 are rounded to guide the airflow and reduce resistance.

[0031] In this embodiment, multiple air guide valves 220 are provided inside the air intake chamber 200. The air guide valves 220 and the cylinder liner 100 are arranged alternately in sequence to divide the air intake chamber 200 into two sub-chambers 230. Two air intake pipes 210 are respectively connected to the two sub-chambers 230.

[0032] The guide valve 220 is used to connect and close the two sub-chambers 230. When one of the cylinder chambers 120 is intake, the guide valve 220 adjacent to it is opened, so that the angle between the airflow direction in the intake chamber 200 and the intake direction of the intake port 110 on the cylinder liner 100 is less than 90 degrees. After the airflow enters the intake chamber 200, it is guided by the outer peripheral wall of the cylinder liner 100 and flows through the guide valve 220 between the two adjacent cylinder liners 100.

[0033] Furthermore, in this embodiment, the intake direction of the intake pipe 210 is parallel to the circumferential tangential direction of the cylinder liner 100 near the intake pipe 210. After the airflow enters the intake chamber 200, it is guided by the outer peripheral wall of the cylinder liner 100, allowing the airflow to flow more smoothly through the two adjacent cylinder liners 100.

[0034] In use, external air enters the intake chamber 200 through two intake pipes 210 in different directions, and then flows into the cylinder chamber 120 through the inclined intake port 110 to form a vortex intake. When controlling the intake of different cylinder chambers 120, the adjacent guide valve 220 is opened to make the angle between the airflow direction in the intake chamber 200 and the flow direction of the intake port 110 less than 90 degrees. In this way, the airflow flows along different channels in the intake chamber 200, maintaining consistency with the guidance of the intake port 110, so that the inclination angle of each intake port 110 can fully exert its guiding effect, thereby making full use of the energy of the intake airflow. Furthermore, the intake direction of the intake pipe 210 is arranged along the inner peripheral wall of the intake chamber 200, and the angle between it and the flow direction of the intake port 110 adjacent to the inner peripheral wall is less than 90 degrees, so that the intake airflow is consistent with the direction of the intake port 110, effectively reducing flow loss. Under the same tilt angle, the vortex ratio is significantly improved compared with the traditional air passage. The present invention can improve the vortex ratio with the same intake flow coefficient as the existing two-stroke engine, and solves the problem of low vortex ratio under high flow coefficient of traditional two-stroke engine.

[0035] Furthermore, in this embodiment, a partition 240 is provided between the cylinder liners 100 at both ends and the intake chamber 200, and a guide valve 220 is provided between two adjacent cylinder liners 100. The partition 240 extends in the left and right direction. The partition 240 at the left end is located at the lower left position and close to the intake pipe 210 on the left side, while the partition 240 at the right end is located at the upper right position and close to the intake pipe 210 on the right side.

[0036] The flow guide valve 220 in this embodiment includes a valve 221 and an opening and closing drive structure that drives the valve 221 to rotate. The rotation axis of the valve 221 is located at the center of the valve 221 and is located at the center of two adjacent cylinder liners 100. The rotation axis of the valve 221 is parallel to the axis of the cylinder liner 100. Figure 1 As shown, when the air guide valve 220 is in the open state, the valve 221 rotates to a vertically extending position, and when the air guide valve 220 is in the closed state, the valve 221 rotates to a horizontally extending position.

[0037] The sum of the intake cross-sectional areas of the two intake pipes 210 is greater than or equal to 1.5 times the sum of the intake cross-sectional areas of all intake ports 110, so as to ensure that it will not become a factor limiting the flow coefficient.

[0038] To ensure consistent air intake at each air intake port 110, the cylinder center distance between two adjacent cylinder liners 100 is greater than or equal to 1.5 times the cylinder diameter of the cylinder liner 100.

[0039] The working principle of the engine intake system in this embodiment: When air enters the left-side cylinder chamber 120, the left-side guide valve 220 is opened and the right-side guide valve 220 is closed. At this time, the inclination direction of all air intake ports 110 on the left-side cylinder liner 100 is less than 90 degrees from the airflow direction. Figure 1 ; When air enters the middle cylinder chamber 120, the left and right guide valves 220 are opened. At this time, the inclination direction of all air intake ports 110 on the middle cylinder liner 100 is less than 90 degrees from the airflow direction. Figure 2 ; When air enters the right-hand cylinder chamber 120, the left-hand guide valve 220 is closed, and the right-hand guide valve 220 is opened. At this time, the tilt angle between all the air intake ports 110 on the right-hand cylinder liner 100 and the airflow direction is less than 90 degrees. Figure 3 .

[0040] This invention ensures consistent air intake for each cylinder chamber 120 by controlling the opening and closing of different air guide valves 220.

[0041] In addition, the present invention also proposes a two-stroke engine, including the engine intake system described above.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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 invention. In this specification, the illustrative expressions of the above terms 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.

[0043] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A variable-channel engine intake system, characterized in that, include: A cylinder liner is provided in multiple ways. The cylinder liner has a cylinder chamber inside. The peripheral wall of the cylinder liner has multiple air inlets arranged at intervals along the circumference. The air intake direction of the multiple air inlets is inclined along the same circumference of the cylinder liner. An intake chamber is provided with multiple air guide valves inside. The multiple air guide valves and multiple cylinder liners are arranged alternately in the intake chamber to divide the intake chamber into two sub-chambers. The intake chamber surrounds the outer periphery of the multiple cylinder liners. The air inlet connects the cylinder chamber and the intake chamber. The peripheral wall of the intake chamber is provided with at least two intake pipes arranged circumferentially at intervals. Each sub-chamber is connected to at least one intake pipe. The intake direction of the at least two intake pipes is respectively arranged along the inner peripheral wall of the intake chamber, and the angle between them and the intake direction of the air inlet near the inner peripheral wall of the intake chamber is less than 90 degrees. When one of the cylinder chambers is receiving air, the adjacent air guide valve is opened, so that the angle between the airflow direction in the intake chamber and the intake direction of the air inlet on the cylinder liner is less than 90 degrees.

2. The engine intake system according to claim 1, characterized in that: The intake chamber is equipped with a partition, and the cylinder liners at both ends are respectively equipped with partitions between them and the intake chamber. A guide valve is provided between two adjacent cylinder liners.

3. The engine intake system according to claim 2, characterized in that: The flow guide valve includes a valve and an opening and closing drive structure that drives the valve to rotate. The rotation axis of the valve is located at the center of the valve and is located at the center of two adjacent cylinder liners. The rotation axis of the valve is parallel to the axis of the cylinder liner.

4. The engine intake system according to claim 1, characterized in that: The sum of the intake cross-sectional areas of at least two of the intake pipes is greater than or equal to 1.5 times the sum of the intake cross-sectional areas of all the intake ports.

5. The engine intake system according to claim 1, characterized in that: The cylinder center distance between two adjacent cylinder liners is greater than or equal to 1.5 times the cylinder diameter of the cylinder liner.

6. The engine intake system according to claim 2, characterized in that: The cylinder liners are arranged sequentially at intervals along a straight line.

7. The engine intake system according to claim 6, characterized in that: The intake direction of the intake pipe is parallel to the circumferential tangential direction of the cylinder liner near the intake pipe.

8. The engine intake system according to claim 7, characterized in that: The intake direction of the intake pipe is the same as the arrangement direction of the plurality of cylinder liners.

9. The engine intake system according to claim 8, characterized in that: The partition extends along the direction in which the plurality of cylinder liners are arranged.

10. A two-stroke engine, characterized in that: Includes the engine intake system as described in any one of claims 1 to 9.

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