A cylinder liner, combustion system and engine

Abstract

This utility model relates to a cylinder liner, a combustion system, and an engine. The cylinder liner is used to mate with a cylinder head with a roof. The cylinder head with a roof has intake valves and exhaust valves that can extend into the cylinder liner. An intake clearance recess is provided on the inner wall of the cylinder liner at the end near the roof, corresponding to the position of the intake valve. Along the radial direction of the intake valve, the distance between the intake clearance recess and the axis of the intake valve is greater than the radius of the valve head. Similarly, an exhaust clearance recess is provided on the inner wall of the cylinder liner at the end near the roof, corresponding to the position of the exhaust valve. Along the radial direction of the exhaust valve, the distance between the exhaust clearance recess and the axis of the exhaust valve is greater than the radius of the valve head. This cylinder liner allows for larger valve seats and valves without increasing the overall size, preventing collisions between the valves and the cylinder liner. This makes it possible to use larger valve seats and valves in the cylinder head with a roof, thereby improving the flow capacity of the intake and exhaust systems and enhancing engine performance.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine technology, and in particular to a cylinder liner, combustion system and engine. Background Technology

[0002] An engine's operation relies on two key systems: the intake system and the exhaust system. The intake system is responsible for introducing fresh air or a combustible mixture into the engine, while the exhaust system is responsible for expelling the exhaust gases after combustion. These two systems together affect engine performance, and their optimized design is crucial for improving engine performance and efficiency.

[0003] The intake and exhaust systems, acting as the throat of the engine, require improved flow to not only reduce flow losses but also ensure a sufficient intake volume and increase torque capacity. It's easy to understand that the size of the valve seats and valves plays a crucial role in the flow of the intake and exhaust systems. However, the increasing size of valve seats and valves, especially in the combustion chamber, is limited by the cylinder bore, thus restricting the flow capacity of the intake and exhaust systems. Utility Model Content

[0004] The first objective of this invention is to provide a cylinder liner that avoids affecting the size of the valve seat and valve, thereby improving the flow capacity of the intake and exhaust system.

[0005] The second objective of this invention is to provide a combustion system and an engine that include the aforementioned cylinder liner.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] In a first aspect of this application, a cylinder liner is provided for mating with a cylinder head with a roof. The cylinder head with a roof is provided with an intake valve and an exhaust valve that can extend into the cylinder liner. An intake clearance recess is provided on the inner wall of the cylinder liner at the end near the roof, corresponding to the position of the intake valve. Along the radial direction of the intake valve, the distance between the intake clearance recess and the axis of the intake valve is greater than the radius of the valve head of the intake valve. An exhaust clearance recess is provided on the inner wall of the cylinder liner at the end near the roof, corresponding to the position of the exhaust valve. Along the radial direction of the exhaust valve, the distance between the exhaust clearance recess and the axis of the exhaust valve is greater than the radius of the valve head of the exhaust valve.

[0008] In one possible implementation, the intake clearance recess is shaped by the intersection of the inner wall surface of the cylinder liner and a first rotary surface about the axis of the intake valve, wherein the radius of the first rotary surface is greater than the radius of the valve head of the intake valve.

[0009] In one possible implementation, the exhaust clearance recess is shaped by the intersection of the inner wall surface of the cylinder liner and a second rotary surface about the axis of the exhaust valve, wherein the radius of the second rotary surface is greater than the radius of the valve head of the exhaust valve.

[0010] In one possible implementation, the radial distance T1 between the intake clearance recess and the valve head of the intake valve along the radial direction of the intake valve satisfies 2.5mm≤T1≤3.5mm.

[0011] In one possible implementation, the radial distance T2 between the exhaust clearance recess and the valve head of the exhaust valve along the radial direction of the exhaust valve satisfies 3mm ≤ T2 ≤ 5mm.

[0012] In one possible implementation, the distance L between the inner wall of the cylinder liner and the upper end face of the piston ring when the piston is at top dead center, and the lower end of the intake clearance recess and the exhaust clearance recess, satisfies L > 0.

[0013] In one possible implementation, the distance L between the inner wall of the cylinder liner and the upper end face of the piston ring when the piston is at top dead center, and the lower end of the intake clearance recess and the exhaust clearance recess, satisfies L≥3mm.

[0014] As can be seen from the above technical solution, this utility model discloses a cylinder liner for use with a cylinder head. The cylinder head is provided with an intake valve and an exhaust valve that can extend into the cylinder liner. An intake clearance recess is provided on the inner wall of the cylinder liner near the cylinder head, corresponding to the position of the intake valve. Along the radial direction of the intake valve, the distance between the intake clearance recess and the axis of the intake valve is greater than the radius of the valve head of the intake valve. An exhaust clearance recess is provided on the inner wall of the cylinder liner near the cylinder head, corresponding to the position of the exhaust valve. Along the radial direction of the exhaust valve, the distance between the exhaust clearance recess and the axis of the exhaust valve is greater than the radius of the valve head of the exhaust valve.

[0015] By setting intake clearance recesses at the position of the intake valve and exhaust clearance recesses at the position of the exhaust valve on the cylinder liner, space can be provided for larger valve seats and valves without increasing the cylinder liner size, avoiding collisions between valves and cylinder liners. This makes it possible to use larger valve seats and valves in the cylinder head, thereby improving the flow capacity of the intake and exhaust systems and enhancing engine performance.

[0016] In a second aspect of this application, a combustion system is provided, including a combustion chamber surrounded by a cylinder, a cylinder head, and a piston, wherein a cylinder liner as described in the first aspect and its possible implementations is provided inside the cylinder.

[0017] In one possible implementation, the cylinder head is provided with an intake valve seat for contacting and engaging with the intake valve, wherein the bottom hole of the intake valve seat on the side away from the exhaust valve and the intake clearance recess of the cylinder liner are located on the same rotational surface.

[0018] The cylinder head with the canopy is provided with an exhaust valve seat ring for contacting and engaging with the exhaust valve. The bottom hole of the exhaust valve seat ring on the side away from the intake valve has its hole wall on the same rotational surface as the exhaust clearance recess of the cylinder liner.

[0019] In a third aspect of this application, an engine is provided, including a combustion system as described in the second aspect and its possible implementations.

[0020] Since the combustion system and engine employ cylinder liners as described in the first aspect and its possible implementations, the combustion system and engine should therefore have the same beneficial effects as the aforementioned cylinder liners, which will not be elaborated upon here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cylinder liner provided in an embodiment of the present utility model;

[0023] Figure 2 A cross-sectional view of a cylinder liner provided in an embodiment of this utility model;

[0024] Figure 3 A cross-sectional view of the combustion system provided in an embodiment of this utility model.

[0025] Figures 1 to 3 middle:

[0026] 100 is the cylinder liner; 110 is the inner wall of the cylinder liner; 120 is the intake clearance recess; 130 is the exhaust clearance recess; 200 is the cylinder head roof; 210 is the intake manifold; 220 is the exhaust manifold; 300 is the intake valve; 400 is the exhaust valve; 500 is the bottom hole of the intake valve seat; 600 is the bottom hole of the exhaust valve seat; 700 is the piston; 800 is the piston ring. Detailed Implementation

[0027] One of the core features of this invention is to provide a cylinder liner whose structural design allows it to avoid affecting the size of the valve seat and valve, thereby improving the flow capacity of the intake and exhaust system.

[0028] Another core aspect of this invention is to provide a combustion system and an engine that include the aforementioned cylinder liner.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] The engine's combustion system, as the "heart" of the engine, is responsible for burning fuel, converting the chemical energy of the fuel into mechanical energy through the crank mechanism and rotating mechanism, and then outputting it to the outside.

[0031] As an important component of the combustion system, the combustion chamber undertakes the key tasks of mixing fuel and air, ignition and combustion, and energy conversion. The combustion chamber is generally surrounded by the cylinder head, cylinder, and piston. The cylinder is installed on the engine block, and a cylindrical cylinder liner is installed inside the cylinder. The piston is fitted inside the cylinder liner and can move axially. The cylinder head fits into the engine block and covers the upper opening of the cylinder. The cylinder head is provided with intake and exhaust passages. The intake passage is provided with intake valves, and an intake valve seat is provided at the contact point between the cylinder head and the intake valve. The exhaust passage is provided with exhaust valves, and an exhaust valve seat is provided at the contact point between the cylinder head and the exhaust valve. When the intake and exhaust valves are open, they can partially extend into the cylinder liner.

[0032] The function of the combustion chamber is to provide a sealed space for fuel combustion, and to create a space environment for the compression and expansion of the combustible mixture through piston movement, thereby completing energy conversion. The combustion chamber refers to the space between the top of the piston and the cylinder head and cylinder liner after the piston reaches top dead center.

[0033] Generally, most mainstream engines are four-stroke engines, meaning that the piston completes a full working cycle in the cylinder through four key stages: intake stroke, compression stroke, power stroke, and exhaust stroke. During the intake stroke, the piston moves downwards from top dead center, the intake valve opens, and the exhaust valve closes. As the piston descends, a negative pressure is created in the cylinder, drawing the air-fuel mixture into the combustion chamber. During the compression stroke, the piston moves upwards, both the intake and exhaust valves close, and the mixture is compressed to a high temperature and pressure state, preparing for subsequent combustion. During the power stroke, the ignition device ignites the compressed mixture, and the high-temperature gas expands, pushing the piston downwards, which in turn rotates the crankshaft via the connecting rod, generating power. During the exhaust stroke, the piston moves upwards again, the exhaust valve opens, the intake valve closes, and the combusted exhaust gases are expelled from the cylinder, before the next cycle begins.

[0034] It is evident that during the intake stroke, the dimensions of the intake valve and valve seat play a crucial role in the airflow of the intake passage. Similarly, during the exhaust stroke, the dimensions of the exhaust valve and valve seat play a crucial role in the airflow of the exhaust passage. In other words, the larger the dimensions of the valve and valve seat, the better the airflow of the passage.

[0035] However, it is foreseeable that in order to ensure that the valves can open smoothly, the valve size will inevitably be limited by the cylinder liner size. Increasing the cylinder liner size will inevitably lead to an increase in engine size and weight, which is not conducive to controlling engine cost and energy consumption. Therefore, for those skilled in the art, how to increase the valve and valve seat size without increasing the cylinder size so that the engine air passage can obtain better flow has become an important technical problem that urgently needs to be solved.

[0036] Based on the above reasons, this application provides a cylinder liner for cooperating with a cylinder head with an exhaust mantle. The portion of the cylinder head that forms the combustion chamber includes an intake mantle and an exhaust mantle. The intake mantle and the exhaust mantle are set at an angle, and the connection between the intake mantle and the exhaust mantle arches away from the cylinder. The intake mantle is connected to the intake mantle.

[0037] It should be noted that the intake manifold that works with the cylinder head is generally a tumble intake manifold. This means that the airflow in the intake manifold is guided by the intake manifold to form a tumble in the combustion chamber. The tumble is a swirling motion perpendicular to the cylinder axis formed in the engine cylinder. The tumble breaks into a high-intensity turbulence in the later stage of piston compression. Compared with the traditional vortex, it can improve the combustion rate, suppress knocking and enhance lean-burn capability. The exhaust side cylinder head is connected to the exhaust manifold.

[0038] The cylinder head is equipped with intake valves and exhaust valves that can extend into the cylinder liner. The intake valve is installed in the intake manifold and can reciprocate along its own axis. When the intake valve is open, the intake valve partially extends into the cylinder liner. The exhaust valve is installed in the exhaust manifold and can reciprocate along its own axis. When the exhaust valve is open, the exhaust valve partially extends into the cylinder liner. The angle between the axis of the intake valve and the horizontal plane is greater than 0° and less than 90°. The angle between the axis of the intake valve and the horizontal plane and the angle between the axis of the exhaust valve and the horizontal plane may be the same or different.

[0039] The intake and exhaust valves are mainly composed of valve stems and valve heads. The diameter of the valve head is larger than the diameter of the valve stem. The valve stem slides with the cylinder head through a guide tube located in the cylinder head. When the valve moves relative to the cylinder head to the point where there is a gap between the valve head and the valve seat, the intake passage is connected to the combustion chamber. When the valve contacts the valve seat, the intake passage is disconnected from the combustion chamber.

[0040] like Figure 1 and Figure 2As shown, an intake clearance recess 120 is provided on the inner wall 110 of the cylinder liner 100 near the top cylinder head 200, corresponding to the position of the intake valve 300. The intake clearance recess 120 extends to the end face of the cylinder liner 100 near the top cylinder head 200. The surface of the intake clearance recess 120 can be an arc surface or a spherical surface, or it can be formed by multiple arc surfaces with different curvatures smoothly connected or by multiple spherical surfaces with different curvatures connected, or it can be formed by multiple planes connected, or by at least one plane connected to at least one arc surface or spherical surface.

[0041] Specifically, the surface shape of the intake clearance recess 120 can be designed entirely or partially according to the radial profile of the valve head of the intake valve 300. The radial gap between the intake clearance recess 120 and the valve head of the intake valve 300 can be uniformly arranged along the circumference of the valve head of the intake valve 300, or it can be unevenly arranged along the circumference of the valve head of the intake valve 300.

[0042] Along the radial direction of the intake valve 300, the distance between the intake clearance recess 120 and the axis of the intake valve 300 is greater than the radius of the valve head of the intake valve 300, so that there is sufficient clearance between the valve head of the intake valve 300 and the cylinder liner 100 during the opening process, to prevent the valve head of the intake valve 300 from colliding with the cylinder liner 100 and to leave room for intake air flow.

[0043] An exhaust clearance recess 130 is provided on the inner wall 110 of the cylinder liner 100 near the top cylinder head 200, corresponding to the position of the exhaust valve 400. The exhaust clearance recess 130 extends to the end face of the cylinder liner 100 near the top cylinder head 200. The surface of the exhaust clearance recess 130 can be an arc surface or a sphere, or it can be formed by multiple arc surfaces with different curvatures smoothly connected or by multiple spheres with different curvatures connected, or it can be formed by multiple planes connected, or by at least one plane connected to at least one arc surface or sphere.

[0044] It should be noted that the surface shape of the exhaust clearance recess 130 can be designed entirely or partially according to the radial profile of the valve head of the exhaust valve 400. The radial gap between the exhaust clearance recess 130 and the valve head of the exhaust valve 400 can be uniformly set along the circumference of the valve head of the exhaust valve 400, or it can be unevenly set along the circumference of the valve head of the exhaust valve 400.

[0045] Along the radial direction of the exhaust valve 400, the distance between the exhaust clearance recess 130 and the axis of the exhaust valve 400 is greater than the radius of the valve head of the exhaust valve 400, so that there is sufficient clearance between the valve head of the exhaust valve 400 and the cylinder liner 100 during the opening process, preventing the valve head of the exhaust valve 400 from colliding with the cylinder liner 100 and leaving a clearance for exhaust flow.

[0046] Compared with the prior art, the cylinder liner 100 provided in this application has an intake clearance recess 120 at the position corresponding to the intake valve 300 and an exhaust clearance recess 130 at the position corresponding to the exhaust valve 400. This allows space for larger valve seats and valves without increasing the size of the cylinder liner 100, preventing collisions between the valves and the cylinder liner 100. This makes it possible to use larger valve seats and valves in the cylinder head 200, thereby improving the flow capacity of the intake and exhaust system and enhancing engine performance.

[0047] Please see Figure 1 and Figure 2 In one embodiment of this application, the intake clearance recess 120 is shaped by the intersection of the inner wall 110 of the cylinder liner 100 and a first rotary surface with the axis of the intake valve 300 as the axis. The radius of the first rotary surface is larger than the radius of the valve head of the intake valve 300. This not only ensures that the surface of the intake clearance recess 120 is a smooth arc surface to reduce stress concentration, but also facilitates processing. Furthermore, the radial profile of the valve head is usually circular. The arc surface of the intake clearance recess 120 helps to ensure that the radial distance between the intake clearance recess 120 and the valve head of the intake valve 300 remains uniform in the circumferential direction of the valve head of the intake valve 300.

[0048] Similar to the intake clearance recess 120, in one embodiment of this application, the exhaust clearance recess 130 is shaped by the intersection of the inner wall 110 of the cylinder liner 100 and a second rotary surface with the axis of the exhaust valve 400 as the axis. The radius of the second rotary surface is greater than the radius of the valve head of the exhaust valve 400. The radius of the first rotary surface and the radius of the second rotary surface may be the same or different.

[0049] The aforementioned intake clearance recess 120 and exhaust clearance recess 130, which are inclined relative to the cylinder liner axis, ensure that the lift of the intake valve 300 and exhaust valve 400 is not limited by the size of the intake clearance recess 120 and exhaust clearance recess 130, thus providing greater practicality.

[0050] Please see Figure 3 In one embodiment of this application, along the radial direction of the intake valve 300, the radial distance T1 between the intake clearance recess 120 and the valve head of the intake valve 300 satisfies 2.5mm≤T1≤3.5mm. The radial distance T1 between the intake clearance recess 120 and the valve head of the intake valve 300 refers to the distance between the intake clearance recess 120 and the valve head of the intake valve 300 along the radial direction of the valve head of the intake valve 300.

[0051] In this way, while ensuring that the valve head of the intake valve 300 does not collide with the cylinder liner 100, by appropriately reducing the radial distance T1 between the intake clearance recess 120 and the valve head of the intake valve 300, the intake airflow in the intake passage 210 can be reduced from flowing into the combustion chamber from the side of the intake valve 300 away from the exhaust valve 400. This enhances the air resistance capability of the side of the intake valve 300 away from the exhaust valve 400, allowing as much intake airflow as possible to flow into the combustion chamber from the side of the intake valve 300 closer to the exhaust valve 400. This guides more intake airflow to form tumble flow, increases the tumble ratio, enhances the uniformity of the fuel mixture, effectively improves the combustion efficiency of the engine, thereby increasing the engine's power output and helping to reduce engine fuel consumption. It also has a positive effect on reducing harmful gas emissions.

[0052] Further optimize the above technical solutions, such as Figure 3 As shown, in one embodiment of this application, along the radial direction of the exhaust valve 400, the radial distance T2 between the exhaust clearance recess 130 and the valve head of the exhaust valve 400 satisfies 3mm≤T2≤5mm. The radial distance T1 between the exhaust clearance recess 130 and the valve head of the exhaust valve 400 refers to the radial distance between the exhaust clearance recess 130 and the valve head of the exhaust valve 400 along the valve head of the exhaust valve 400.

[0053] Under the premise of ensuring that the valve head of the exhaust valve 400 does not collide with the cylinder liner 100, by appropriately increasing the radial distance T2 between the exhaust clearance recess 130 and the valve head of the exhaust valve 400, the exhaust resistance of the combustion chamber can be reduced, thereby improving the engine's working efficiency, making the engine's power output smoother, and helping to reduce the engine load, improve the fuel atomization effect, make combustion more complete, and reduce fuel consumption.

[0054] It is readily understood by those skilled in the art that the sealing performance of the combustion chamber directly affects the pressure stability within the combustion chamber, whether fuel leaks, and whether fuel can burn completely, thus impacting engine performance. Therefore, to ensure the sealing of the combustion chamber, multiple piston rings are typically provided on the piston 700. Multiple piston grooves are provided on the circumferential outer wall of the piston 700. The piston rings are metal rings partially embedded in the piston grooves. Functionally, piston rings are divided into two types: compression rings and oil rings. The compression rings are used to seal the combustible mixture in the combustion chamber, while the oil rings are used to scrape off excess oil from the inner wall 110 of the cylinder liner 100. Typically, two compression rings and at least one oil ring are provided axially on the piston 700. The compression ring closest to the top surface of the piston 700 is usually referred to as piston ring 800.

[0055] It is foreseeable that the design of the intake clearance recess 120 and the exhaust clearance recess 130 will cause a gap to appear on the upper end of the inner wall of the cylinder liner 100. If the piston 700 is at top dead center and the piston ring 800 moves to the position of the intake clearance recess 120 or the exhaust clearance recess 130, a gap will appear between the piston ring 800 and the inner wall 110 of the cylinder liner 100, resulting in poor sealing of the combustion chamber and leakage of the combustible mixture from the combustion chamber. To avoid this situation, please refer to [further details needed]. Figure 3 In one embodiment of this application, the distance L between the inner wall 110 of the cylinder liner 100 corresponding to the position of the upper end face of the piston ring 800 when the piston 700 is at the top dead center and the lower end of the intake clearance recess 120 and the exhaust clearance recess 130 satisfies L > 0. By controlling the relative position of the intake clearance recess 120 and the exhaust clearance recess 130 with the top dead center position of the piston 700, it is possible to avoid the intake clearance recess 120 and the exhaust clearance recess 130 causing combustion chamber gas leakage, affecting the combustion chamber sealing performance, and ensuring stable pressure in the combustion chamber and complete combustion of fuel.

[0056] To further optimize the above technical solution, in one embodiment of this application, the distance L between the inner wall 110 of the cylinder liner 100 corresponding to the position of the upper end face of the piston ring 800 when the piston 700 is at the top dead center and the lower end of the intake clearance recess 120 and the exhaust clearance recess 130 satisfies L≥3mm.

[0057] This application embodiment also provides a combustion system, which includes a combustion chamber, such as... Figure 3 As shown, the combustion chamber is formed by a cylinder, a cylinder head 200, and a piston 700. The cylinder is provided with a cylinder liner 100 as described in the above embodiment. Since the combustion system uses the cylinder liner 100 in the above embodiment, the technical effect of the combustion system can be referred to the above embodiment.

[0058] Please continue reading. Figure 3 The cylinder head 200 is provided with an intake valve seat for contacting and engaging with the intake valve 300. The bottom hole 500 of the intake valve seat on the side away from the exhaust valve 400 and the intake clearance recess 120 of the cylinder liner 100 are located on the same rotational surface. That is, the radial clearance Z1 between the bottom hole of the intake valve seat on the side away from the exhaust valve 400 and the valve head of the intake valve 300 is equal to the radial clearance T1 between the intake clearance recess 120 and the valve head of the intake valve 300. This can increase the length of the air blocking side of the intake valve 300 away from the exhaust valve 400 and further improve the tumble ratio.

[0059] The cylinder head 200 is provided with an exhaust valve seat for contacting and engaging with the exhaust valve 400. The bottom hole 600 of the exhaust valve seat on the side away from the intake valve 300 and the exhaust clearance recess 130 of the cylinder liner 100 are located on the same rotational surface. That is, the radial clearance Z2 between the bottom hole of the exhaust valve seat on the side away from the intake valve 300 and the valve head of the exhaust valve 400 is equal to the radial clearance T2 between the exhaust clearance recess 130 and the valve head of the exhaust valve 400.

[0060] By making the radial clearance Z1 between the bottom hole of the intake valve seat on the side away from the exhaust valve 400 and the valve head of the intake valve 300 equal to the radial clearance T1 between the intake clearance recess 120 and the valve head of the intake valve 300, and the radial clearance Z2 between the bottom hole of the exhaust valve seat on the side away from the intake valve 300 and the valve head of the exhaust valve 400 equal to the radial clearance T2 between the exhaust clearance recess 130 and the valve head of the exhaust valve 400, the step between the cylinder liner and the valve seat can be reduced, thereby avoiding affecting the intake and exhaust flow capacity of the combustion chamber.

[0061] This application also provides an engine, which includes the combustion system described in the above embodiments. Since the engine uses the combustion system described in the above embodiments, the technical effects of the engine can be referred to the above embodiments. The engine includes, but is not limited to, gasoline engines, diesel engines and natural gas engines.

[0062] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0063] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0064] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A cylinder liner for cooperation with a pentroof cylinder head (200) provided with an intake valve (300) and an exhaust valve (400) capable of being inserted into the cylinder liner (100), characterized in that, An intake clearance recess (120) is provided on the inner wall of the cylinder liner (100) near the top cylinder head (200) at the position corresponding to the intake valve (300). The distance between the intake clearance recess (120) and the axis of the intake valve (300) along the radial direction of the intake valve (300) is greater than the radius of the valve head of the intake valve (300). An exhaust clearance recess (130) is provided on the inner wall of the cylinder liner (100) near the top cylinder head (200) at the position corresponding to the exhaust valve (400). The distance between the exhaust clearance recess (130) and the axis of the exhaust valve (400) along the radial direction of the exhaust valve (400) is greater than the radius of the valve head of the exhaust valve (400).

2. The cylinder liner according to claim 1, characterized by The intake clearance recess (120) is shaped by the intersection of the inner wall surface of the cylinder liner (100) and a first rotary surface with the axis of the intake valve (300) as the axis, and the radius of the first rotary surface is greater than the radius of the valve head of the intake valve (300).

3. The cylinder liner according to claim 1 or 2, characterized by The exhaust clearance recess (130) is formed by the intersection of the inner wall surface of the cylinder liner (100) and a second rotary surface with the axis of the exhaust valve (400) as the axis, and the radius of the second rotary surface is greater than the radius of the valve head of the exhaust valve (400).

4. The cylinder liner according to claim 1, characterized by Along the radial direction of the intake valve (300), the radial distance T1 between the intake clearance recess (120) and the valve head of the intake valve (300) satisfies 2.5mm≤T1≤3.5mm.

5. The cylinder liner according to claim 1, characterized in that, Along the radial direction of the exhaust valve (400), the radial distance T2 between the exhaust clearance recess (130) and the valve head of the exhaust valve (400) satisfies 3mm≤T2≤5mm.

6. The cylinder liner of claim 1 wherein, The distance L between the inner wall of the cylinder liner (100) corresponding to the position of the upper end face of the piston ring (800) when the piston (700) is at the top dead center and the lower end of the intake clearance recess (120) and the exhaust clearance recess (130) satisfies L > 0.

7. The cylinder liner according to claim 6, characterized by The distance L between the inner wall of the cylinder liner (100) corresponding to the position of the upper end face of the piston ring (800) when the piston (700) is at the top dead center and the lower end of the intake clearance recess (120) and the exhaust clearance recess (130) satisfies L≥3mm.

8. A combustion system characterized by, It includes a combustion chamber, which is surrounded by a cylinder, a cylinder head (200) and a piston (700), and the cylinder is provided with a cylinder liner (100) as described in any one of claims 1-7.

9. The combustion system of claim 8, wherein, The cylinder head (200) is provided with an intake valve seat for contacting and engaging with the intake valve (300). The bottom hole (500) of the intake valve seat has its hole wall on the side away from the exhaust valve (400) on the same rotational surface as the intake clearance recess (120) of the cylinder liner (100). The cylinder head (200) is provided with an exhaust valve seat for contacting and engaging with the exhaust valve (400). The bottom hole (600) of the exhaust valve seat has its hole wall on the side away from the intake valve (300) on the same rotational surface as the exhaust clearance recess (130) of the cylinder liner (100).

10. An engine characterized by, Includes the combustion system as described in claim 8 or 9.

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