Cylinder assembly and internal combustion engine
By setting multiple cooling runners and communication runners between the cylinder liner and the installation cavity, the problems of insufficient cooling and poor positioning effect of the cylinder liner are solved, efficient cooling and stable coordination are achieved, and the performance and life of the internal combustion engine are improved.
Patent Information
- Application Number
- CN202422406457.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The existing cylinder liner is insufficient cooling, especially in the piston ring position, which leads to excessive temperature and affects the performance of the internal combustion engine. The positioning effect between the cylinder liner and the body is poor, which is easy to cause vibration and cavitation.
The first and second cooling flow channels are formed between the top and middle outer wall of the cylinder liner and the cavity wall of the installation cavity, and are communicated through multiple communication flow channels to enhance the contact area between the coolant and the cylinder liner, and at the same time, a gap fit is used between adjacent communication flow channels to ensure a stable fit between the cylinder liner and the installation cavity.
It improves the cooling effect of the cylinder liner, reduces vibration and cavitation phenomena, enhances the positioning effect between the cylinder liner and the body, and improves the working performance and service life of the internal combustion engine.
Smart Images
Figure CN223120037U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of internal combustion engines, and particularly relates to a cylinder assembly and an internal combustion engine. Background Art
[0002] The main function of the cylinder liner is to jointly form a cylinder working space with the cylinder head and the piston, bear the lateral thrust of the piston, and become the guide of the reciprocating motion of the piston. When the internal combustion engine is working, a combustion process occurs inside the cylinder, and the gas temperature can reach about 2500 °C. This high-temperature and high-pressure gas directly acts on the inner wall of the cylinder liner, resulting in the cylinder liner being directly affected by the high-temperature and high-pressure gas. If these heats are not dissipated in time, it will cause the temperature of the cylinder liner to be too high, thereby having a negative impact on the performance and service life of the internal combustion engine.
[0003] There are some defects in the design of traditional wet cylinder liners, especially the insufficient cooling capacity at the position of the first piston ring (i.e., the position where the first piston ring is located when the piston runs to the top dead center). This problem will cause the temperature in this area to be too high, thereby affecting the overall performance of the internal combustion engine. In addition, the existing cylinder liners are mainly matched with the engine body through positioning rings, and this design makes the cylinder liner prone to large vibrations during operation. The increase in vibrations will reduce the stiffness of the cylinder liner, thereby further causing cavitation corrosion. Cavitation corrosion is a phenomenon of local damage on the surface of materials caused by the combined action of material fatigue and corrosion. It will gradually expand into small pits and may eventually lead to the damage of the cylinder liner.
[0004] Therefore, there is an urgent need to develop a cylinder assembly and an internal combustion engine to solve the problems such as insufficient cooling and poor positioning effect between the cylinder liner and the engine body mentioned above. Summary of the Utility Model
[0005] The purpose of the utility model is to at least solve the problem of how to improve the cooling effect of the cylinder liner while strengthening the positioning effect between the cylinder liner and the engine body. This purpose is achieved through the following technical solutions:
[0006] A first aspect of the utility model proposes a cylinder assembly, including an engine body and a cylinder liner. The engine body is provided with an installation cavity, and the cylinder liner is arranged inside the installation cavity. A first cooling flow channel is formed between the outer wall of the top of the cylinder liner and the cavity wall of the installation cavity, and a second cooling flow channel is formed between the outer wall of the middle part of the cylinder liner and the cavity wall of the installation cavity. The first cooling flow channel and the second cooling flow channel are communicated through a plurality of communicating flow channels arranged at intervals, and the outer wall of the cylinder liner and the cavity wall of the installation cavity between adjacent communicating flow channels are in clearance fit.
[0007] This technical solution cools the position of the first piston ring by arranging a first cooling channel at the top of the cylinder liner. By arranging a second cooling channel and connecting the second cooling channel and the first cooling channel through a plurality of connecting channels, the contact area between the coolant and the cylinder liner is enhanced, thereby improving the heat dissipation effect. Between adjacent connecting channels, the outer wall of the cylinder liner and the wall of the installation cavity are in clearance fit. In this fit mode, when the cylinder liner expands due to heat, its outer wall will closely adhere to the wall of the installation cavity, so that the positioning of the entire cylinder liner is very reliable, effectively reducing the vibration and deformation of the cylinder liner. At the same time, the cavitation problem on the surface of the cylinder liner 200 is alleviated. Therefore, the cylinder assembly provided in this embodiment not only fully cools the position of the first piston ring, but also takes into account the positioning between the cylinder liner and the engine block, realizes the stable fit between the cylinder liner and the engine block, reduces the vibration of the cylinder liner, and reduces the occurrence probability of cavitation, significantly improving the working performance of the diesel engine.
[0008] In addition, the cylinder assembly of the present utility model may further have the following additional technical features:
[0009] In some embodiments of the present utility model, a plurality of connecting grooves are arranged at intervals on the outer wall of the cylinder liner, and the connecting grooves and the wall of the installation cavity form the connecting channels.
[0010] In some embodiments of the present utility model, the connecting grooves extend along the axial direction of the cylinder liner, and a plurality of the connecting grooves are arranged at intervals along the circumferential direction of the cylinder liner.
[0011] In some embodiments of the present utility model, the shape of the connecting groove is a straight shape, a wavy shape or an arc shape.
[0012] In some embodiments of the present utility model, a ring groove is arranged on the outer side of the top of the cylinder liner, and the ring groove and the wall of the installation cavity form the first cooling channel.
[0013] In some embodiments of the present utility model, a groove is arranged along the circumferential direction of the wall of the installation cavity, and the groove and the outer wall of the cylinder liner form the second cooling channel.
[0014] In some embodiments of the present utility model, a liquid inlet channel and a liquid outlet channel are arranged on the engine block, the liquid inlet channel is communicated with the second cooling channel, and the liquid outlet channel is communicated with the first cooling channel.
[0015] In some embodiments of the present utility model, a positioning shoulder is convexly provided at the top end of the cylinder liner, a positioning groove is provided at the top end of the engine block, and the positioning shoulder is arranged inside the positioning groove.
[0016] In some embodiments of the present utility model, a sealing ring is arranged between the outer wall of the cylinder liner and the wall of the installation cavity.
[0017] The present utility model also provides an internal combustion engine, which includes a piston and the cylinder assembly in the above-described embodiment. The piston is disposed inside the cylinder liner, and the position of the first ring of the piston corresponds to the position of the first cooling flow channel. Description of the Drawings
[0018] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0019] Figure 1 Schematically shows a cross-sectional view of a cylinder liner according to an embodiment of the present utility model;
[0020] Figure 2 Schematically shows a structural view of a cylinder liner according to an embodiment of the present utility model;
[0021] Figure 3 Schematically shows a cross-sectional view of a cylinder assembly according to an embodiment of the present utility model.
[0022] The reference numerals in the drawings are as follows:
[0023] 100, body; 110, liquid inlet channel; 120, liquid outlet channel; 130, first cooling flow channel; 140, second cooling flow channel; 150, connecting flow channel; 160, sealing ring; 200, cylinder liner; 210, ring groove; 220, connecting groove; 230, positioning shoulder. Detailed Embodiments
[0024] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.
[0025] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless explicitly stated as an order of performance. It should also be understood that additional or alternative steps may be used.
[0026] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.
[0027] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can include both an upper and a lower orientation.
[0028] Figure 1 A cross-sectional schematic view of a cylinder liner 200 according to an embodiment of the present utility model is schematically shown. Figure 2 A structural schematic view of a cylinder liner 200 according to an embodiment of the present utility model is schematically shown. Figure 3 A cross-sectional schematic view of a cylinder assembly according to an embodiment of the present utility model is schematically shown. As Figures 1 to 3As shown in the figure, the present utility model proposes a cylinder assembly, which includes a body 100 and a cylinder liner 200. The body 100 is provided with an installation cavity, and the cylinder liner 200 is arranged inside the installation cavity. A first cooling flow channel 130 is formed between the outer wall of the top of the cylinder liner 200 and the cavity wall of the installation cavity, and a second cooling flow channel 140 is formed between the outer wall of the middle part of the cylinder liner 200 and the cavity wall of the installation cavity. The first cooling flow channel 130 and the second cooling flow channel 140 are connected through a plurality of spaced connecting flow channels 150, and the outer wall of the cylinder liner 200 and the cavity wall of the installation cavity between adjacent connecting flow channels 150 are in clearance fit.
[0029] Through the above technical solution, by arranging the first cooling flow channel 130 at the top of the cylinder liner 200, the position of the first piston ring is cooled. By arranging the second cooling flow channel 140 and connecting the second cooling flow channel 140 and the first cooling flow channel 130 through a plurality of connecting flow channels 150, the contact area between the coolant and the cylinder liner 200 is increased, thereby improving the heat dissipation effect. Between adjacent connecting flow channels 150, the outer wall of the cylinder liner 200 and the cavity wall of the installation cavity are in clearance fit. In this fitting mode, when the cylinder liner 200 expands due to heat, its outer wall will closely adhere to the cavity wall of the installation cavity, so that the positioning of the entire cylinder liner 200 is very reliable, effectively reducing the vibration and deformation of the cylinder liner 200. At the same time, the cavitation problem on the surface of the cylinder liner 200 is alleviated. Therefore, the cylinder assembly provided in this embodiment not only fully cools the position of the first piston ring, but also takes into account the positioning between the cylinder liner 200 and the body 100, realizes the stable fit between the cylinder liner 200 and the body 100, reduces the vibration of the cylinder liner 200, and reduces the occurrence probability of cavitation, significantly improving the working performance of the diesel engine.
[0030] Further, referring to Figure 1 and Figure 2 , a ring groove 210 is arranged on the outer side of the top of the cylinder liner 200, and the ring groove 210 and the cavity wall of the installation cavity form the first cooling flow channel 130.
[0031] Optionally, in this embodiment, the cross-sectional shape of the ring groove 210 in the vertical plane ( Figure 1 the XY plane in the figure) is approximately rectangular. To reduce stress concentration, fillet treatment is performed at its corners. In other embodiments, the cross-sectional shape of the ring groove 210 in the vertical plane can also be semi-circular or other shapes. The width T of the ring groove 210 is set as required and will not be specifically limited here. Preferably, the ring groove 210 is arranged opposite to the position of the first piston ring. In some embodiments, the ring groove 210 can be arranged on the inner wall of the installation cavity, so that the ring groove 210 and the outer wall of the cylinder liner 200 form the first cooling flow channel 130.
[0032] Further, continue to refer to Figure 2, in some embodiments, a plurality of communication grooves 220 are spaced on the outer wall of the cylinder liner 200, and a communication flow channel 150 is formed between the communication grooves 220 and the wall of the installation cavity.
[0033] By providing a plurality of communication grooves 220, the flow rate of the coolant can be increased, thereby improving the cooling effect. In other embodiments, the communication grooves 220 can also be provided on the wall of the installation cavity, so that the communication grooves 220 and the outer wall of the cylinder liner 200 form a communication flow channel 150. Of course, a first communication groove 220 can also be provided on the wall of the installation cavity, and a second communication groove 220 can be provided on the outer wall of the cylinder liner 200, and the first communication groove 220 and the second communication groove 220 cooperate to form a communication flow channel 150.
[0034] Furthermore, the communication grooves 220 extend along the axial direction of the cylinder liner 200, and a plurality of communication grooves 220 are spaced along the circumferential direction of the cylinder liner 200.
[0035] In this way, one end of the communication flow channel 150 is connected to the first cooling flow channel 130, and the other end is connected to the second cooling flow channel 140, thereby realizing the parallel connection of a plurality of communication flow channels 150. In some specific embodiments, the communication grooves 220 can be designed to be inclined towards the same side, or can be arranged in a crossed manner. The length and width of the communication grooves 220, the number of the communication grooves 220, and the interval between adjacent communication grooves 220 can be flexibly adjusted and set according to actual usage requirements, and are not specifically limited herein.
[0036] Optionally, the shape of the communication grooves 220 can be linear, wavy or arc-shaped, etc.
[0037] It can be understood that by designing the communication flow channel 150 into a wavy or arc-shaped structure, the contact area between the coolant and the cylinder liner 200 can be effectively increased. In this way, the coolant can more fully exchange heat with the surface of the cylinder liner 200, thereby significantly improving the cooling efficiency. This design not only optimizes the performance of the cooling system, but also helps to improve the overall operating efficiency and life of the engine.
[0038] Furthermore, referring to Figure 3 , a groove is provided along the circumferential direction of the wall of the installation cavity, and the groove and the outer wall of the cylinder liner 200 form a second cooling flow channel 140.
[0039] Optionally, the groove is an annular groove arranged circumferentially along the installation cavity, and the width of the groove is set according to the usage requirements. In some embodiments, the groove can be arranged on the outer wall of the cylinder liner 200, so that the groove and the outer wall of the cylinder liner 200 form a second cooling flow channel 140. In other embodiments, a first groove can also be arranged on the outer wall of the installation cavity, and a second groove can be arranged on the outer wall of the cylinder liner 200, and the first groove and the second groove cooperate to form a second cooling flow channel 140. In this embodiment, there is one second cooling flow channel 140. In other embodiments, the number of the second cooling flow channels 140 can be multiple, and the multiple second cooling flow channels 140 are arranged at intervals along the axial direction of the cylinder liner 200, and the multiple second cooling flow channels 140 are communicated through a communication flow channel 150.
[0040] Furthermore, a liquid inlet channel 110 and a liquid outlet channel 120 are arranged on the engine block 100. The liquid inlet channel 110 is communicated with the second cooling flow channel 140, and the liquid outlet channel 120 is communicated with the first cooling flow channel 130.
[0041] With this setting method, the coolant enters the second cooling flow channel 140 from the liquid inlet channel 110, surrounds the cylinder liner 200 once through the second cooling flow channel 140, flows upward through the communication flow channel 150 to the first cooling flow channel 130, surrounds the position of the first piston ring once through the first cooling flow channel 130, and finally flows out from the liquid outlet channel 120. In some embodiments, the liquid inlet channel 110 is communicated with the first cooling flow channel 130, and the liquid outlet channel 120 is communicated with the second cooling flow channel 140. The coolant enters the first cooling flow channel 130 through the liquid inlet channel 110, surrounds the position of the first piston ring once through the first cooling flow channel 130, flows downward through the communication flow channel 150 to the second cooling flow channel 140, surrounds the cylinder liner 200 once through the second cooling flow channel 140, and finally flows out from the liquid outlet channel 120.
[0042] Furthermore, a positioning shoulder 230 protrudes from the top end of the cylinder liner 200, and a positioning groove is arranged at the top end of the engine block 100. The positioning shoulder 230 is arranged inside the positioning groove.
[0043] This design enables the positioning shoulder 230 to be precisely embedded inside the positioning groove. Through this precise fit, the positioning between the cylinder liner 200 and the engine block 100 becomes very reliable, effectively reducing the vibration of the cylinder liner 200 during operation and minimizing the impact of vibration on the stiffness of the cylinder liner 200. In addition, this stable positioning helps reduce wear, thereby extending the service life of the cylinder liner 200. At the same time, it can significantly reduce the occurrence of cavitation erosion of the cylinder liner 200, further improving the reliability and performance of the engine. In some cases, a clearance fit can be adopted between the outer side of the positioning shoulder 230 and the inner side of the positioning groove. This design ensures that when the cylinder liner 200 expands due to heat, the positioning shoulder 230 and the positioning groove fit tightly, ensuring the efficient and stable operation of the engine.
[0044] Optionally, a sealing ring 160 is provided between the outer wall of the cylinder liner 200 and the wall of the installation cavity.
[0045] The sealing ring 160 is provided to significantly enhance the sealing performance between the outer wall of the cylinder liner 200 and the wall of the installation cavity, ensuring no leakage during operation. To further ensure the stability and reliability of the sealing ring 160, a positioning ring groove specifically for positioning the sealing ring 160 can be provided on the wall of the installation cavity. In this way, the sealing ring 160 can be effectively prevented from shifting in position during use, thus maintaining its optimal sealing effect. In this embodiment, to further improve the sealing effect, two sealing rings 160 are provided. However, according to actual needs and design requirements, the number of sealing rings 160 can be flexibly adjusted. In other different embodiments, the number of sealing rings 160 can be one, three, four, etc., and the specific number can be selected according to the actual situation and is not specifically limited here. Optionally, in some embodiments, the sealing ring 160 can be placed below the second cooling channel 140.
[0046] Optionally, a clearance fit is adopted between the outer wall of the cylinder liner 200 and the inner wall of the installation cavity ( Figure 3 at positions A, B, and C). After the cylinder liner 200 expands due to heat, the cylinder liner 200 and the engine block 100 fit tightly, making the positioning of the entire cylinder liner 200 very reliable, reducing the vibration of the cylinder liner 200 and the deformation of the cylinder bore, and effectively alleviating the cavitation erosion problem on the surface of the cylinder liner 200. Optionally, the clearance at position A is smaller than the clearance at position B. Optionally, in this embodiment, the coolant can be cooling water, and in other embodiments, the coolant can also be cooling oil.
[0047] Furthermore, this embodiment also provides an internal combustion engine, including a piston and the above-mentioned cylinder assembly. The piston is disposed inside the cylinder liner 200, and the position of the first ring of the piston corresponds to the position of the first cooling channel 130.
[0048] By adopting the above-mentioned cylinder assembly, the flow rate of the coolant at the position of the first ring of the piston is increased. This improvement measure significantly improves the cooling efficiency of the cylinder liner 200 and effectively prevents the problem of the cylinder liner 200 caused by excessive temperature. In addition, there is a good positioning effect between the cylinder liner 200 and the engine body 100, which can effectively reduce the vibration of the cylinder liner 200 and reduce the negative impact of the vibration on the rigidity of the cylinder liner 200, thereby reducing the occurrence of micro-motion wear and cavitation, and ensuring the stable operation and long service life of the internal combustion engine.
[0049] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A cylinder assembly, characterized in that, It includes a body (100) and a cylinder liner (200). The body (100) is provided with an installation cavity, and the cylinder liner (200) is arranged inside the installation cavity. The outer wall at the top of the cylinder liner (200) and the cavity wall of the installation cavity form a first cooling flow channel (130). The outer wall in the middle of the cylinder liner (200) and the cavity wall of the installation cavity form a second cooling flow channel (140). The first cooling flow channel (130) and the second cooling flow channel (140) are connected by a plurality of spaced connecting flow channels (150). The outer wall of the cylinder liner (200) between adjacent connecting flow channels (150) and the cavity wall of the installation cavity are in clearance fit.
2. The cylinder assembly according to claim 1, wherein, A plurality of connecting grooves (220) are spaced on the outer wall of the cylinder liner (200), and the connecting grooves (220) and the cavity wall of the installation cavity form the connecting flow channel (150).
3. The cylinder assembly according to claim 2, characterized in that, The connecting grooves (220) extend along the axial direction of the cylinder liner (200), and a plurality of the connecting grooves (220) are spaced along the circumferential direction of the cylinder liner (200).
4. The cylinder assembly according to claim 2, wherein, The shape of the connecting groove (220) is a straight shape, a wavy shape or an arc shape.
5. The cylinder assembly according to claim 1, wherein, A ring groove (210) is arranged outside the top of the cylinder liner (200), and the ring groove (210) and the cavity wall of the installation cavity form the first cooling flow channel (130).
6. The cylinder assembly according to claim 1, wherein, A groove is arranged along the circumferential direction of the cavity wall of the installation cavity, and the groove and the outer wall of the cylinder liner (200) form the second cooling flow channel (140).
7. The cylinder assembly according to claim 1, characterized in that, An inlet channel (110) and an outlet channel (120) are arranged on the body (100). The inlet channel (110) is connected to the second cooling flow channel (140), and the outlet channel (120) is connected to the first cooling flow channel (130).
8. The cylinder assembly according to claim 1, wherein, A positioning shoulder (230) protrudes from the top end of the cylinder liner (200), and a positioning groove is arranged at the top end of the body (100). The positioning shoulder (230) is arranged inside the positioning groove.
9. The cylinder assembly according to any one of claims 1-8, characterized in that, A sealing ring (160) is arranged between the outer wall of the cylinder liner (200) and the cavity wall of the installation cavity.
10. An internal combustion engine, characterized in that, It includes a piston and a cylinder assembly according to any one of claims 1-9. The piston is arranged inside the cylinder liner (200), and the position of a ring of the piston corresponds to the position of the first cooling flow channel (130).