Cylinder sleeve and engine with same

Abstract

The utility model provides an air cylinder sleeve and an engine with the same, the air cylinder sleeve comprises a cylinder sleeve body, the cylinder sleeve body is provided with a fixing part and a mounting part which are oppositely arranged, and the mounting part is provided with a mounting groove in the circumferential direction of the mounting part; the cylinder sleeve outer sleeve is arranged on the mounting part of the cylinder sleeve body in a sleeving manner and covers the mounting groove, so that the mounting groove and the cylinder sleeve outer sleeve define a cooling water sleeve for containing cooling liquid; wherein a plurality of water inlet holes and a plurality of water outlet holes are formed in the end face, far away from the fixing part, of the mounting part at intervals, so that cooling liquid enters the cooling water jacket from the water inlet holes to be circulated and flows out from the water outlet holes, and the problems of water leakage and the like due to the fact that the cooling water jacket is arranged between a machine body and a cylinder sleeve in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine cylinder liners, in particular to a cylinder liner and an engine having the same. Background Art

[0002] At present, the cylinder liner is one of the most important parts in the engine. It is used to seal the gas and guide the piston movement. It is a heat exchanger for internal combustion. At the same time, the cylinder liner supports the cylinder block. The cooling water jacket of the diesel engine cylinder liner is generally made of cast iron, which has a complex processing process and high processing and manufacturing costs for the cooling water jacket and the cylinder liner body. Moreover, the water jacket and the cylinder liner body are two independent components. The cylinder liner body must cooperate with the water jacket. The structure of the cylinder liner body is complex and the processing and manufacturing costs are high.

[0003] However, during high-intensity and high-efficiency engine operation, cylinder liner cooling is crucial and directly impacts engine stability and lifespan. Wet cylinder liners, through direct contact with the coolant, effectively remove heat generated by combustion. However, traditional designs, where the cooling water jacket is typically located between the engine block and the cylinder liner, rely on a rubber ring seal. This sealing method is susceptible to aging over time. Furthermore, the vibrations of diesel engine operation can degrade the sealing performance of the rubber ring, leading to coolant leakage, reduced cooling efficiency, and even cooling system failure. Utility Model Content

[0004] The main purpose of the utility model is to provide a cylinder liner and an engine having the same, so as to solve the problem of water leakage caused by the cooling water jacket being arranged between the engine body and the cylinder liner in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a cylinder liner is provided, comprising: a cylinder liner body, having a fixing portion and a mounting portion arranged relatively to each other, the mounting portion being provided with a mounting groove around its circumferential direction; a cylinder liner outer sleeve, sleeved on the mounting portion of the cylinder liner body and covering the mounting groove, so that the mounting groove and the cylinder liner outer sleeve form a cooling water jacket for accommodating coolant; a plurality of water inlet holes and a plurality of water outlet holes are respectively provided on the end surface of the mounting portion away from the fixing portion, so that the coolant enters the cooling water jacket from the plurality of water inlet holes for circulation and flows out from the plurality of water outlet holes.

[0006] Furthermore, the cylinder liner also includes a blocking component, which is arranged in the cooling water jacket along the length direction of the cylinder liner body and is respectively connected to the part in the mounting groove and the part of the cylinder liner outer jacket, so as to block part of the coolant flowing in the cooling water jacket along its circumferential direction.

[0007] Furthermore, the blocking component includes two oppositely arranged blocking plates, one end of the blocking plate is connected to one side of the end surface of the cooling water jacket close to the mounting portion, and a flow port is formed between the other end of the blocking plate and one side of the cooling water jacket close to the fixing portion.

[0008] Furthermore, the length L of the flow port along the length direction of the cylinder liner body satisfies: 15 mm ≤ L ≤ 25 mm.

[0009] Furthermore, the radial thickness H1 of the cooling water jacket satisfies: 3mm≤H1≤5mm.

[0010] Furthermore, an annular supporting shoulder is provided on the cylinder liner body between the fixing portion and the mounting portion for mating and connecting with the connecting groove on the machine body.

[0011] Furthermore, the radial thickness H2 of the annular support shoulder satisfies: 4 mm ≤ H2 ≤ 6 mm.

[0012] Furthermore, a filter screen is provided in the water inlet and the water outlet, respectively for filtering the coolant flowing into the water inlet and flowing out of the water outlet; and / or, the water inlet is any one of an arc-shaped hole, a circular hole and a square hole; and / or, the water outlet is any one of an arc-shaped hole, a circular hole and a square hole.

[0013] Furthermore, the cylinder liner body and the cooling water jacket are an integrally formed structure.

[0014] According to another aspect of the present invention, an engine is provided, comprising an engine body, a cylinder head and the above-mentioned cylinder liner, wherein the cylinder liner is mounted on the engine body, and an end surface of a mounting portion of the cylinder liner is connected to the cylinder head.

[0015] According to the technical solution of the present invention, the cylinder liner includes a cylinder liner body and a cylinder liner outer sleeve; the cylinder liner body has a fixing portion and a mounting portion that are relatively arranged, and the mounting portion is provided with a mounting groove around its circumferential direction; the cylinder liner outer sleeve is sleeved on the mounting portion of the cylinder liner body and covers the mounting groove, so that the mounting groove and the cylinder liner outer sleeve form a cooling water jacket for accommodating coolant; a plurality of water inlet holes and a plurality of water outlet holes are respectively provided on the end surface of the mounting portion away from the fixing portion, so that the coolant enters the cooling water jacket from the plurality of water inlet holes for circulation and flows out from the plurality of water outlet holes.

[0016] In this way, the cooling water jacket no longer needs to be a separate component that mates with the cylinder liner body. Instead, it is directly formed by the cylinder liner body and the cylinder liner outer sleeve, integrating the cooling water jacket with the cylinder liner. This simplifies the cylinder liner structure and reduces processing and manufacturing costs. Coolant enters the cooling water jacket through multiple water inlets and exits through multiple water outlets, enabling coolant circulation within the cooling water jacket. Compared to traditional designs, this multi-point inlet and outlet arrangement distributes coolant more evenly, improving cooling efficiency and effectively removing heat generated by combustion within the cylinders, thereby stabilizing the engine's operating temperature and extending its life. Furthermore, because the cooling water jacket is composed of the cylinder liner outer sleeve and the cylinder liner body, it avoids the traditional reliance on rubber rings for sealing. This reduces coolant leakage caused by rubber ring aging or vibration, enhances overall sealing and reliability, and resolves the problem of water leakage associated with the cooling water jacket being located between the engine body and the cylinder liner in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 FIG1 shows a schematic diagram of the overall structure of a cylinder liner according to an embodiment of the present utility model;

[0019] Figure 2 A schematic structural diagram of a cylinder liner body according to an embodiment of the cylinder liner of the present invention is shown;

[0020] Figure 3 A schematic structural diagram of a cylinder liner provided according to an embodiment of the present utility model and installed in a machine body is shown;

[0021] Figure 4 A cross-sectional view of a cylinder liner provided according to an embodiment of the cylinder liner of the present utility model is shown;

[0022] Figure 5 A cross-sectional view of a cylinder liner provided according to an embodiment of the present invention after being assembled with an engine block and a cylinder head is shown.

[0023] The above drawings include the following reference numerals:

[0024] 1. Engine body; 2. Cylinder head; 10. Cylinder liner body; 11. Fixing part; 12. Mounting part; 120. Mounting groove; 121. Water inlet hole; 122. Water outlet hole; 13. Annular support shoulder; 20. Cylinder liner jacket; 30. Cooling water jacket; 40. Blocking component; 41. Blocking plate; 42. Flow port. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to solve the problem of water leakage caused by the cooling water jacket being arranged between the engine body and the cylinder liner in the prior art, the utility model provides a cylinder liner and an engine having the same.

[0027] Please refer to Figures 1 to 5 As shown, the utility model provides a cylinder liner, comprising a cylinder liner body 10 and a cylinder liner outer sleeve 20; the cylinder liner body 10 has a fixing portion 11 and a mounting portion 12 arranged relatively to each other, and the mounting portion 12 is provided with a mounting groove 120 around its circumferential direction; the cylinder liner outer sleeve 20 is sleeved on the mounting portion 12 of the cylinder liner body 10 and covers the mounting groove 120, so that the mounting groove 120 and the cylinder liner outer sleeve 20 form a cooling water jacket 30 for accommodating coolant; a plurality of water inlet holes 121 and a plurality of water outlet holes 122 are respectively provided on the end surface of the mounting portion 12 away from the fixing portion 11, so that the coolant enters the cooling water jacket 30 from the plurality of water inlet holes 121 for circulation and flows out from the plurality of water outlet holes 122.

[0028] With the technical solution of this embodiment, the cooling water jacket 30 no longer needs to be a separate component that mates with the cylinder liner body 10. Instead, it is directly formed by the cylinder liner body 10 and the cylinder liner outer cover 20. This integration of the cooling water jacket 30 and the cylinder liner simplifies the cylinder liner structure and reduces processing and manufacturing costs. Coolant enters the cooling water jacket 30 through multiple water inlet holes 121 and exits through multiple water outlet holes 122, enabling coolant circulation within the cooling water jacket 30. Compared to conventional designs, this multi-point inlet and multi-point outlet arrangement distributes coolant more evenly, improving cooling efficiency and effectively removing heat generated by combustion within the cylinders, thereby stabilizing the engine's operating temperature and extending its life. Furthermore, because the cooling water jacket 30 is comprised of the cylinder liner outer cover 20 and the cylinder liner body 10, it avoids the need for a rubber ring for sealing in conventional designs. This reduces coolant leakage caused by rubber ring aging or vibration, enhances overall sealing and reliability, and resolves the problem of water leakage that can occur when the cooling water jacket 30 is positioned between the engine body 1 and the cylinder liner in conventional designs.

[0029] To ensure efficient circulation of the coolant within the cooling water jacket 30, the cylinder liner further includes a blocking member 40. This blocking member 40 is disposed within the cooling water jacket 30 along the length of the cylinder liner body 10 and is connected to portions within the mounting groove 120 and to portions of the cylinder liner outer sleeve 20, respectively. This blocking member 40 is used to block a portion of the coolant flowing circumferentially within the cooling water jacket 30. This arrangement, by controlling the coolant flow path, ensures a longer residence time within the cooling water jacket 30 and a larger contact area, thereby enhancing heat exchange. It also helps stabilize the flow of the coolant, preventing ineffective circumferential circulation of the coolant within the cooling water jacket 30, resulting in a more orderly flow of the coolant and improved cooling efficiency.

[0030] Specifically, the blocking component 40 includes two opposing blocking plates 41. One end of each blocking plate 41 is connected to the end surface of the cooling water jacket 30 near the mounting portion 12. A flow opening 42 is formed between the other end of each blocking plate 41 and the end of the cooling water jacket 30 near the fixing portion 11. This arrangement, with the flow openings 42 formed between the two blocking plates 41 and the bottom of the cooling water jacket 30, reduces dead zones within the cooling water jacket 30 where coolant flow is difficult to reach or remains for extended periods. This effectively prevents coolant at the bottom of the cooling water jacket 30 from circulating, thereby improving cooling efficiency. Furthermore, the connection between the blocking plates 41 and the inner wall of the cooling water jacket 30 increases the structural strength of the entire cooling water jacket 30, helping to withstand the impact of coolant and reduce deformation of the cooling water jacket 30 under the influence of high-pressure coolant, thereby enhancing the overall reliability of the cylinder liner.

[0031] In a specific embodiment of the present invention, the length L of the flow port 42 along the length direction of the cylinder liner body 10 satisfies: 15mm≤L≤25mm. Through the above-mentioned setting, since the length of the flow port 42 directly affects the resistance and flow rate of the coolant when passing through. In this way, a shorter flow port 42 length (such as 15mm) will increase the fluid resistance and may cause the coolant flow rate to decrease; while a longer flow port 42 length (such as 25mm) will reduce the resistance and may cause the coolant flow rate to increase. By limiting the length L of the flow port 42 to the range of 15mm to 25mm, the flow rate and pressure can be balanced to ensure that the flow of the coolant in the cooling water jacket 30 is neither too fast nor too slow, which helps to evenly distribute and effectively circulate the coolant to achieve optimal heat exchange efficiency.

[0032] Specifically, the radial thickness H1 of the cooling water jacket 30 satisfies the following: 3mm ≤ H1 ≤ 5mm. Through the above arrangement, the radial thickness of the cooling water jacket 30 directly affects its heat conduction efficiency. Thus, a thinner cooling water jacket 30 (e.g., 3mm) may result in excessively rapid heat conduction between the coolant and the cylinder liner body 10, causing the coolant temperature to rise rapidly and reducing the cooling effect. On the other hand, an excessively thick cooling water jacket 30 (e.g., greater than 5mm) may reduce the heat conduction rate, affecting the coolant's ability to cool the cylinder liner body 10. Limiting the thickness to between 3mm and 5mm balances the heat conduction rate, ensuring that the coolant effectively removes heat while maintaining a low internal temperature. This thickness range also helps maintain the structural stability of the cooling water jacket 30, reduces thermal expansion and contraction effects caused by temperature changes, and extends the service life of the cooling water jacket 30.

[0033] like Figures 2 to 5 As shown, an annular support shoulder 13 is provided on the cylinder liner body 10 between the fixing portion 11 and the mounting portion 12, adapted to engage with a connecting groove on the engine body. This arrangement ensures the precise positioning and support of the cylinder liner during installation. This helps to more securely secure the cylinder liner within the engine body 1, reduces displacement or deformation of the cylinder liner caused by improper installation or vibration during engine operation, and improves the stability and safety of engine operation.

[0034] Specifically, the radial thickness H2 of the annular support shoulder 13 satisfies the following: 4mm ≤ H2 ≤ 6mm. The annular support shoulder 13 is a crucial connection and support structure between the cylinder liner and the engine block 1. Selecting a thickness between 4mm and 6mm provides sufficient strength to support the cylinder liner in its position within the engine. This, in particular, allows it to withstand the mechanical stresses generated by piston movement and combustion, preventing movement or deformation of the cylinder liner under high-intensity operating conditions.

[0035] Optionally, filters are provided within both the water inlet 121 and the water outlet 122 to filter the coolant flowing into and out of the water outlet 122, respectively. These filters effectively prevent impurities and particulate matter in the cooling system from entering the cooling water jacket 30, reducing wear on the cooling water jacket 30 and the engine, thereby extending the engine's service life. They also ensure coolant cleanliness during circulation, preventing coolant deterioration or blockage caused by impurities, and ensuring the proper operation and efficiency of the cooling system.

[0036] Optionally, the water inlet hole 121 is any one of an arc-shaped hole, a circular hole and a square hole; the water outlet hole 122 is any one of an arc-shaped hole, a circular hole and a square hole.

[0037] It should be noted that, in the present invention, the number, position, shape and size of the water inlet holes 121 and the water outlet holes 122 are not limited to specific settings, and these parameters can be flexibly adjusted according to actual needs and specific application scenarios. For example, the size of the cylinder liner, the operating conditions of the engine, the circulation requirements of the coolant, etc., can all be factors to be considered when designing the water inlet holes 121 and the water outlet holes 122. The flexibility of this design enables the present invention to better adapt to different types of engines, optimize the cooling effect, and at the same time ensure the stability of the cooling system and the efficient operation of the engine. In addition, by adjusting the number and position of the holes, the distribution of the coolant can be further optimized and the overall cooling efficiency can be improved. In short, the non-limiting selection of these parameters reflects the versatility and adaptability of the design of the present invention.

[0038] Optionally, the cylinder liner body 10 and the cooling water jacket 30 are integrally molded. This eliminates any gaps that may exist between the cylinder liner body 10 and the cooling water jacket 30, significantly improving sealing performance, reducing the risk of coolant leakage, and ensuring reliable operation of the cooling system. It also reduces interfacial resistance in the heat conduction path, making heat transfer from the cylinder liner body 10 to the cooling water jacket 30 more direct and efficient, enhancing the cooling effect and helping to maintain the engine within the optimal operating temperature range. This also simplifies the manufacturing process, reduces assembly time and costs, mitigates quality issues caused by imprecise assembly, and improves production efficiency and product consistency.

[0039] Another aspect of the present invention provides an engine comprising an engine block 1, a cylinder head 2, and the aforementioned cylinder liner. The cylinder liner is mounted on the engine block 1, with the end surface of the cylinder liner mounting portion 12 connected to the cylinder head 2. As such, due to the integrated design of the cooling water jacket 30 and the cylinder liner, as well as the unique layout of the water inlet 121 and water outlet 122, the coolant circulation efficiency is significantly improved, effectively removing heat generated during operation, maintaining the engine operating at a suitable temperature, and enhancing the engine's thermal efficiency and reliability.

[0040] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0041] The cylinder liner includes a cylinder liner body 10 and a cylinder liner jacket 20. The cylinder liner body 10 has a fixing portion 11 and a mounting portion 12 disposed opposite each other. The mounting portion 12 is provided with a mounting groove 120 circumferentially therearound. The cylinder liner jacket 20 is fitted over the mounting portion 12 of the cylinder liner body 10 and covers the mounting groove 120, so that the mounting groove 120 and the cylinder liner jacket 20 form a cooling water jacket 30 for accommodating coolant. A plurality of water inlet holes 121 and a plurality of water outlet holes 122 are spaced apart on the end surface of the mounting portion 12, distal from the fixing portion 11. Coolant enters the cooling water jacket 30 through the plurality of water inlet holes 121 for circulation and exits through the plurality of water outlet holes 122. As a result, the cooling water jacket 30 no longer needs to be a separate component that mates with the cylinder liner body 10. Instead, it is directly formed by the cylinder liner body 10 and the cylinder liner jacket 20, integrating the cooling water jacket 30 with the cylinder liner. This simplifies the structure of the cylinder liner and reduces processing and manufacturing costs. At the same time, coolant enters the cooling water jacket 30 through multiple water inlet holes 121 and exits through multiple water outlet holes 122, achieving a circulating flow of coolant within the cooling water jacket 30. Compared to conventional designs, this multi-point inlet and multi-point outlet method distributes the coolant more evenly, improving cooling efficiency and effectively removing heat generated by combustion within the cylinders, thereby stabilizing the engine's operating temperature and extending its life. Furthermore, because the cooling water jacket 30 is composed of the cylinder liner outer shell 20 and the cylinder liner body 10, it avoids the need for a rubber ring for sealing in conventional designs. This reduces coolant leakage caused by rubber ring aging or vibration, enhances overall sealing and reliability, and resolves the problem of water leakage that occurs when the cooling water jacket 30 is positioned between the engine body 1 and the cylinder liner in the prior art.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0044] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cylinder liner, characterized in that: include: The cylinder sleeve body (10) has a fixing portion (11) and a mounting portion (12) arranged opposite to each other, wherein the mounting portion (12) is provided with a mounting groove (120) in a circumferential direction thereof; a cylinder liner outer sleeve (20) sleeved on the mounting portion (12) of the cylinder liner body (10) and covering the mounting groove (120), so that the mounting groove (120) and the cylinder liner outer sleeve (20) form a cooling water jacket (30) for accommodating coolant; Wherein, a plurality of water inlet holes (121) and a plurality of water outlet holes (122) are respectively provided at intervals on the end surface of the mounting portion (12) away from the fixing portion (11), so that the coolant enters the cooling water jacket (30) from the plurality of water inlet holes (121) for circulation and flows out from the plurality of water outlet holes (122).

2. The cylinder liner according to claim 1, characterized in that The cylinder liner further comprises a blocking component (40), which is arranged in the cooling water jacket (30) along the length direction of the cylinder liner body (10) and is respectively connected to a portion in the mounting groove (120) and a portion of the cylinder liner outer jacket (20), so as to block a portion of the coolant flowing in the cooling water jacket (30) along its circumferential direction.

3. The cylinder liner according to claim 2, characterized in that: The blocking component (40) includes two blocking plates (41) arranged opposite to each other, one end of the blocking plate (41) is connected to one side of the end surface of the cooling water jacket (30) close to the mounting portion (12), and a flow port (42) is formed between the other end of the blocking plate (41) and one side of the cooling water jacket (30) close to the fixing portion (11).

4. The cylinder liner according to claim 3, characterized in that The length L of the flow port (42) along the length direction of the cylinder liner body (10) satisfies the following conditions: 15 mm ≤ L ≤ 25 mm.

5. The cylinder liner according to claim 1, characterized in that The radial thickness H1 of the cooling water jacket (30) satisfies: 3mm≤H1≤5mm.

6. The cylinder liner according to claim 1, characterized in that An annular supporting shoulder (13) is provided on the cylinder sleeve body (10) between the fixing portion (11) and the mounting portion (12) for mating with a connecting groove on the machine body (1).

7. The cylinder liner according to claim 6, characterized in that The radial thickness H2 of the annular support shoulder (13) satisfies: 4mm≤H2≤6mm.

8. The cylinder liner according to claim 1, characterized in that The water inlet (121) and the water outlet (122) are both provided with filter screens for filtering the coolant flowing into the water inlet (121) and flowing out of the water outlet (122), respectively; and / or, The water inlet hole (121) is any one of an arc-shaped hole, a circular hole and a square hole; and / or, The water outlet hole (122) is any one of an arc-shaped hole, a circular hole and a square hole.

9. The cylinder liner according to claim 1, characterized in that The cylinder liner body (10) and the cooling water jacket (30) are an integrally formed structure.

10. An engine, characterized in that: The invention comprises a machine body (1), a cylinder head (2) and a cylinder liner according to any one of claims 1 to 9, wherein the cylinder liner is mounted on the machine body (1), and the end surface of the mounting portion (12) of the cylinder liner is connected to the cylinder head (2).

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