Engine cylinder block structure and engine

Abstract

The utility model belongs to the technical field of engines, and discloses an engine cylinder block structure and an engine. The engine cylinder block structure comprises an aluminum cylinder block, a supporting sleeve and a cylinder sleeve. A first supporting face is formed on the inner circumferential wall of the aluminum cylinder body. The supporting sleeve is fixedly inserted into the aluminum cylinder body in the axial direction and is supported on the first supporting face. A second supporting face is formed on the inner circumferential wall of the supporting sleeve. The cylinder sleeve is fixedly inserted into the supporting sleeve and the aluminum cylinder body in the axial direction. A lap joint face is formed on the peripheral wall of the cylinder sleeve and is in lap joint with the second supporting face in the axial direction of the cylinder sleeve. The central axis of the supporting sleeve and the central axis of the cylinder sleeve are collinear. The engine cylinder block structure is small in size and good in light weight effect. And secondly, the compression resistance of the aluminum cylinder body can be effectively improved. And secondly, the phenomenon that the cylinder sleeve is prone to cavitation erosion can be effectively relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine cylinder structure and an engine. Background Art

[0002] The engine block is a key component of an engine. Its upper portion supports the cylinder head, while its lower portion connects to the oil pan. It is one of the media that transmits explosive force to the crankshaft and also serves to withstand the crankshaft's inertial loads. With the continuous advancement of vehicle technology, aluminum is increasingly being used for engine blocks, driven by the desire for lightweighting.

[0003] A conventional engine block structure includes an aluminum block, a first cylinder liner fixedly connected to the aluminum block, and a second cylinder liner detachably connected to the first cylinder liner. While the combination of the first and second cylinder liners improves the engine block's compressive strength, its lightweighting still needs improvement. Furthermore, one axial end of the second cylinder liner overlaps the first cylinder liner and the aluminum block, resulting in a bulky cylinder head, which in turn increases the overall size and weight of the engine. Utility Model Content

[0004] The purpose of the present invention is to provide an engine cylinder structure and an engine, so as to solve the above-mentioned problems existing in an engine cylinder structure in the prior art.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Engine cylinder structure, including:

[0007] an aluminum cylinder body, wherein the inner peripheral wall of the aluminum cylinder body is formed with a first supporting surface;

[0008] A support sleeve is fixedly inserted into the aluminum cylinder along the axial direction and supported on the first support surface; the inner peripheral wall of the support sleeve is formed with a second support surface;

[0009] A cylinder sleeve is fixedly inserted into the support sleeve and the aluminum cylinder body along the axial direction; a lap joint surface is formed on the outer peripheral wall of the cylinder sleeve, and the lap joint surface overlaps the second support surface along the axial direction of the cylinder sleeve;

[0010] The central axis of the support sleeve is collinear with the central axis of the cylinder sleeve.

[0011] As a preferred solution of the above-mentioned engine cylinder structure, the aluminum cylinder includes a first cylinder portion and a second cylinder portion connected in the axial direction, the first support surface is formed in the second cylinder portion, and the first support surface is located at the connection between the first cylinder portion and the second cylinder portion along the axial direction of the aluminum cylinder; the support sleeve is fixedly inserted in the first cylinder portion in the axial direction and supported on the first support surface; an outer cooling chamber is formed between the inner circumferential wall of the first cylinder portion and the outer circumferential wall of the support sleeve.

[0012] As a preferred solution of the above-mentioned engine cylinder block structure, an inner cooling chamber is formed between the inner peripheral wall of the support sleeve and the outer peripheral wall of the cylinder sleeve, and the outer cooling chamber is communicated with the inner cooling chamber.

[0013] As a preferred solution of the above-mentioned engine cylinder block structure, along the axial direction of the support sleeve, one part of the outer cooling chamber and the inner cooling chamber is located above the other.

[0014] As a preferred solution of the above-mentioned engine cylinder structure, the first cylinder part is also provided with a coolant inlet and a coolant outlet, one of the outer cooling chamber and the inner cooling chamber is connected to the coolant inlet, and the other of the outer cooling chamber and the inner cooling chamber is connected to the coolant outlet; the diameter of the coolant inlet is larger than the diameter of the coolant outlet.

[0015] As a preferred solution of the above-mentioned engine cylinder block structure, the engine cylinder block structure also includes a first seal and a second seal, the first seal is used to seal the gap between the support sleeve and the cylinder liner, and the second seal is used to seal the gap between the second cylinder body part and the cylinder liner; along the axial direction of the cylinder liner, the inner cooling chamber is located between the first seal and the second seal.

[0016] As a preferred solution of the above-mentioned engine cylinder structure, the engine cylinder structure also includes a third seal, which is used to seal the gap between the first cylinder part and the support sleeve; along the axial direction of the aluminum cylinder, the third seal is away from the second cylinder part relative to the outer cooling chamber.

[0017] As a preferred solution of the above engine cylinder structure, the support sleeve is interference-inserted into the aluminum cylinder.

[0018] As a preferred solution of the above-mentioned engine cylinder block structure, the support sleeve includes a partition portion and a support portion connected in the axial direction, the second support surface is formed on the support portion, and the second support surface is located at the connection between the partition portion and the support portion along the axial direction of the support sleeve; the partition portion is transitionally fitted with the cylinder liner; the support portion is clearance-fitted with the cylinder liner; and the aluminum cylinder block is clearance-fitted with the cylinder liner.

[0019] An engine comprises the above-mentioned engine cylinder structure.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides an engine cylinder structure and an engine. The engine cylinder structure includes an aluminum cylinder block, a support sleeve, and a cylinder liner. A first support surface is formed on the inner circumferential wall of the aluminum cylinder block. The support sleeve is fixedly inserted into the aluminum cylinder block along the axial direction and supported on the first support surface. A second support surface is formed on the inner circumferential wall of the support sleeve. The cylinder liner is fixedly inserted into the support sleeve and the aluminum cylinder block along the axial direction. A lap joint is formed on the outer circumferential wall of the cylinder liner, and the lap joint overlaps the second support surface along the axial direction of the cylinder liner. The central axis of the support sleeve is collinear with the central axis of the cylinder liner.

[0022] This engine cylinder block structure features a support sleeve disposed between the aluminum cylinder block and the cylinder liner. The support sleeve is axially fixedly inserted into the aluminum cylinder block and supported on a first support surface. It is understood that the support sleeve axially supports the aluminum cylinder block. The support sleeve is located between the two axial ends of the aluminum cylinder block. The axial length of the support sleeve is shorter than that of the aluminum cylinder block. This significantly improves the lightweighting of the engine cylinder block structure compared to existing technologies.

[0023] The inner circumferential wall of the support sleeve is formed with a second supporting surface, and the cylinder sleeve is fixedly inserted into the support sleeve and the aluminum cylinder block along the axial direction, and the overlapping surface overlaps the second supporting surface along the axial direction of the cylinder sleeve. It can be understood that the cylinder sleeve is supported by the support sleeve in the axial direction. The position of the support sleeve supporting the cylinder sleeve is located between the two ends of the cylinder sleeve in the axial direction. Such an arrangement can effectively improve the compressive performance of the aluminum cylinder block. Secondly, compared with the prior art in which one end of the second cylinder sleeve is overlapped with the first cylinder sleeve and the aluminum cylinder block in the axial direction, the maximum outer diameter of the cylinder sleeve can be effectively reduced, thereby effectively reducing the volume and weight of the engine cylinder block structure. In particular, for engines with multiple cylinder sleeves, the cylinder center distance between any two adjacent cylinder sleeves can be effectively reduced, thereby effectively reducing the volume and weight of the engine. Secondly, after simulation analysis, such an arrangement can also effectively alleviate the phenomenon that the cylinder sleeve is easily cavitated.

[0024] As a result, the engine cylinder structure is compact and lightweight. Furthermore, it can effectively improve the compressive strength of the aluminum cylinder block and effectively alleviate the problem of cavitation of the cylinder liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of the engine cylinder structure provided by a specific embodiment of the present utility model;

[0026] Figure 2 It is a cross-sectional view of an aluminum cylinder body and a support sleeve provided by a specific embodiment of the utility model;

[0027] Figure 3 This is a cross-sectional view of an aluminum cylinder block of an engine cylinder block structure provided by a specific embodiment of the present utility model;

[0028] Figure 4 It is a cross-sectional view of a support sleeve of an engine cylinder structure provided by a specific embodiment of the utility model;

[0029] Figure 5 It is a cross-sectional view of a cylinder liner of an engine cylinder structure provided by a specific embodiment of the present utility model.

[0030] In the picture:

[0031] 1. Aluminum cylinder; 11. First cylinder portion; 111. Coolant inlet; 112. Coolant outlet; 113. First mounting hole; 12. Second cylinder portion; 121. First support surface; 122. Second mounting hole;

[0032] 2. Support sleeve; 21. Partition; 211. First communication hole; 212. Second communication hole; 213. Third mounting hole; 22. Support portion; 221. Second support surface; 222. Fourth mounting hole;

[0033] 3. Cylinder liner; 31. Lapping surface; 32. Center working hole;

[0034] 4. Outer cooling chamber;

[0035] 5. Inner cooling chamber;

[0036] 61. First sealing member; 62. Second sealing member; 63. Third sealing member. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] The utility model provides an engine cylinder structure, such as Figure 1-5 As shown, the engine cylinder structure includes an aluminum cylinder block 1, a support sleeve 2, and a cylinder liner 3. A first support surface 121 is formed on the inner circumferential wall of the aluminum cylinder block 1. The support sleeve 2 is fixedly inserted into the aluminum cylinder block 1 along the axial direction and supported on the first support surface 121. A second support surface 221 is formed on the inner circumferential wall of the support sleeve 2. The cylinder liner 3 is fixedly inserted into the support sleeve 2 and the aluminum cylinder block 1 along the axial direction. A lap joint surface 31 is formed on the outer circumferential wall of the cylinder liner 3, and the lap joint surface 31 overlaps the second support surface 221 along the axial direction of the cylinder liner 3. The central axis of the support sleeve 2 is collinear with the central axis of the cylinder liner 3.

[0042] This engine cylinder block structure includes a support sleeve 2 disposed between the aluminum cylinder block 1 and the cylinder liner 3. The support sleeve 2 is axially fixedly inserted into the aluminum cylinder block 1 and supported on the first support surface 121. It is understood that the support sleeve 2 is axially supported by the aluminum cylinder block 1. The position of the support sleeve 2 on the aluminum cylinder block 1 is located between the two axial ends of the aluminum cylinder block 1. The axial length of the support sleeve 2 is less than that of the aluminum cylinder block 1. This effectively improves the lightweighting effect of the engine cylinder block structure compared to the prior art.

[0043] The inner circumferential wall of the support sleeve 2 is formed with a second support surface 221. The cylinder sleeve 3 is fixedly inserted into the support sleeve 2 and the aluminum cylinder block 1 along the axial direction, and the overlapping surface 31 overlaps the second support surface 221 along the axial direction of the cylinder sleeve 3. It can be understood that the cylinder sleeve 3 is supported by the support sleeve 2 in the axial direction. The position of the support sleeve 2 supporting the cylinder sleeve 3 is located between the two axial ends of the cylinder sleeve 3. Such an arrangement can effectively improve the compressive performance of the aluminum cylinder block 1. Secondly, compared with the prior art method of overlapping one axial end of the second cylinder sleeve with the first cylinder sleeve and the aluminum cylinder block, the maximum outer diameter of the cylinder sleeve 3 can be effectively reduced, thereby effectively reducing the volume and weight of the engine cylinder block structure. In particular, for engines with multiple cylinder sleeves 3, the cylinder center distance between any two adjacent cylinder sleeves 3 can be effectively reduced, thereby effectively reducing the volume and weight of the engine. Secondly, after simulation analysis, such an arrangement can also effectively alleviate the phenomenon that the cylinder sleeve 3 is easily cavitated.

[0044] Therefore, the engine cylinder structure is small in size and has a good lightweight effect. Secondly, it can effectively improve the compressive performance of the aluminum cylinder body 1. Secondly, it can effectively alleviate the phenomenon that the cylinder liner 3 is easily corroded.

[0045] It is understandable that if Figure 1 As shown, the axial direction of the aluminum cylinder body 1, the axial direction of the support sleeve 2 and the axial direction of the cylinder sleeve 3 are all parallel.

[0046] Specifically, the strength of the support sleeve 2 is greater than that of the aluminum cylinder body 1. The strength of the cylinder sleeve 3 is greater than that of the aluminum cylinder body 1. This can better improve the compressive performance of the aluminum cylinder body 1.

[0047] Preferably, the support sleeve 2 is made of a different material from the cylinder sleeve 3 to reduce the adhesion between the support sleeve 2 and the cylinder sleeve 3 at high temperatures.

[0048] In this embodiment, the support sleeve 2 is exemplarily made of cast iron. It is understood that the support sleeve 2 has better compressive resistance than the aluminum cylinder body 1. Therefore, the support sleeve 2 is provided between the aluminum cylinder body 1 and the cylinder sleeve 3. The support sleeve 2 acts as a buffer structure, effectively improving the compressive resistance of the aluminum cylinder body 1. In this embodiment, the cylinder sleeve 3 is exemplarily made of stainless steel.

[0049] Among them, such as Figure 1-3 As shown, the aluminum cylinder body 1 includes a first cylinder body part 11 and a second cylinder body part 12 connected in the axial direction, a first support surface 121 is formed in the second cylinder body part 12, and the first support surface 121 is located at the connection between the first cylinder body part 11 and the second cylinder body part 12 in the axial direction of the aluminum cylinder body 1. The support sleeve 2 is fixedly inserted in the first cylinder body part 11 in the axial direction and supported on the first support surface 121. An outer cooling chamber 4 is formed between the inner circumferential wall of the first cylinder body part 11 and the outer circumferential wall of the support sleeve 2. The first cylinder body part 11, the support sleeve 2 and the cylinder liner 3 can be cooled by the outer cooling chamber 4. It can be understood that the outer cooling chamber 4 is an annular chamber. Specifically, as shown in FIG. Figure 1-3 As shown, an annular groove is formed on the inner peripheral wall of the first cylinder portion 11 and / or the outer peripheral wall of the support sleeve 2 , so as to form an outer cooling chamber 4 .

[0050] Specifically, if Figure 1-2 As shown, an inner cooling chamber 5 is formed between the inner peripheral wall of the support sleeve 2 and the outer peripheral wall of the cylinder liner 3, and the outer cooling chamber 4 is connected to the inner cooling chamber 5. This can further improve the cooling effect of the first cylinder body 11, the support sleeve 2 and the cylinder liner 3. It can be understood that the inner cooling chamber 5 is an annular chamber. Specifically, as Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, an annular groove is provided on the inner peripheral wall of the support sleeve 2 and / or the outer peripheral wall of the cylinder sleeve 3 , so as to form an inner cooling chamber 5 .

[0051] Preferably, if Figure 1 As shown, along the axial direction of the support sleeve 2, one portion of the outer cooling chamber 4 and the inner cooling chamber 5 is located above the other. This arrangement increases the axial coverage area of ​​the support sleeve 2 by the coolant, thereby further enhancing the cooling effect on the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3.

[0052] In this embodiment, if Figure 1 As shown, along the axial direction of the support sleeve 2, the inner cooling chamber 5 is partially located above the outer cooling chamber 4. As an alternative, along the axial direction of the support sleeve 2, the outer cooling chamber 4 is partially located above the inner cooling chamber 5.

[0053] Specifically, if Figure 1-3 As shown, the first cylinder portion 11 is further provided with a coolant inlet 111 and a coolant outlet 112. One of the outer cooling chamber 4 and the inner cooling chamber 5 is in communication with the coolant inlet 111, and the other of the outer cooling chamber 4 and the inner cooling chamber 5 is in communication with the coolant outlet 112. Specifically, the coolant flows from the coolant inlet 111 into the outer cooling chamber 4 and the inner cooling chamber 5, and flows out from the coolant outlet 112.

[0054] In this embodiment, if Figure 1-3 As shown, the outer cooling chamber 4 is in communication with the coolant inlet 111 , and the inner cooling chamber 5 is in communication with the coolant outlet 112 . As an alternative, the inner cooling chamber 5 is in communication with the coolant inlet 111 , and the outer cooling chamber 4 is in communication with the coolant outlet 112 .

[0055] In this embodiment, if Figure 1-4 As shown, the support sleeve 2 is provided with a first connecting hole 211 and a second connecting hole 212. The first connecting hole 211 connects the outer cooling chamber 4 and the inner cooling chamber 5. The second connecting hole 212 connects the inner cooling chamber 5 and the coolant outlet 112. The coolant flows sequentially through the coolant inlet 111, the outer cooling chamber 4, the first connecting hole 211, the inner cooling chamber 5, and the second connecting hole 212, and finally flows out of the coolant outlet 112.

[0056] Preferably, if Figure 1-3 As shown, the caliber of the coolant inlet 111 is larger than that of the coolant outlet 112. This arrangement reduces the coolant flow rate at the coolant outlet 112, thereby increasing the coolant's residence time within the outer cooling chamber 4 and the inner cooling chamber 5, allowing the coolant to effectively absorb heat. This further enhances the cooling effect on the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3.

[0057] Preferably, if Figure 1-3 As shown, along the axial direction of the aluminum cylinder block 1, the coolant inlet 111 is located below the coolant outlet 112. When the coolant enters the outer cooling chamber 4, the coolant can be in good contact with all parts of the outer cooling chamber 4. When the coolant enters the inner cooling chamber 5, the coolant can be in good contact with all parts of the inner cooling chamber 5. The residence time of the coolant in the outer cooling chamber 4 and the inner cooling chamber 5 can be further increased, and the effect of cooling the first cylinder body 11, the support sleeve 2 and the cylinder liner 3 can be further improved. As an alternative, along the axial direction of the aluminum cylinder block 1, the coolant inlet 111 is located above the coolant outlet 112.

[0058] Preferably, if Figure 3 As shown, there are multiple coolant outlets 112, which are spaced apart along the circumference of the aluminum cylinder block 1. This allows the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3 to be cooled approximately evenly along the circumference of the aluminum cylinder block 1, thereby further improving the cooling effect of the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3.

[0059] Specifically, if Figure 1As shown, the engine block structure also includes a first seal 61 and a second seal 62. The first seal 61 is used to seal the gap between the support sleeve 2 and the cylinder liner 3, and the second seal 62 is used to seal the gap between the second cylinder portion 12 and the cylinder liner 3. Along the axial direction of the cylinder liner 3, the inner cooling chamber 5 is located between the first seal 61 and the second seal 62. This prevents coolant from leaking through the gap between the support sleeve 2 and the cylinder liner 3, and also from leaking through the gap between the second cylinder portion 12 and the cylinder liner 3. This allows the coolant in the inner cooling chamber 5 to effectively cool the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3.

[0060] Specifically, if Figure 1 and Figure 2 As shown, the engine block structure also includes a third seal 63, which is used to seal the gap between the first cylinder portion 11 and the support sleeve 2. Axially, the third seal 63 is positioned away from the second cylinder portion 12 relative to the outer cooling chamber 4. This prevents coolant from leaking through the gap between the first cylinder portion 11 and the support sleeve 2. The second seal 62 and third seal 63 work together to ensure that the coolant in the outer cooling chamber 4 effectively cools the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3.

[0061] It is understandable that the first sealing member 61 and the third sealing member 63 share the second sealing member 62. This can reduce the number of sealing members provided and reduce costs.

[0062] Optionally, there are multiple first seals 61, which are spaced apart along the axial direction of the cylinder liner 3. There are multiple second seals 62, which are spaced apart along the axial direction of the cylinder liner 3. There are multiple third seals 63, which are spaced apart along the axial direction of the aluminum cylinder block 1, to improve the sealing effect.

[0063] Specifically, the first sealing member 61 , the second sealing member 62 and the third sealing member 63 are all sealing rubber rings.

[0064] Among them, the support sleeve 2 is inserted into the aluminum cylinder body 1 through interference. It can be understood that if Figure 1-3 As shown, the support sleeve 2 is inserted into the first cylinder portion 11 through interference. Figure 1-3 As shown, except for the area where the third seal 63 is provided, the area where the first connecting hole 211 is provided, the area where the second connecting hole 212 is provided, and the area where the outer cooling chamber 4 is provided, the remaining area of ​​the outer peripheral wall of the support sleeve 2 is interference fit with the first cylinder portion 11. This allows the support sleeve 2 to be fixedly inserted into the aluminum cylinder 1 in the axial direction. Secondly, in this embodiment, as Figure 1-3As shown, the area between the first connecting hole 211 and the second connecting hole 212 on the outer peripheral wall of the support sleeve 2 is interference fit with the first cylinder body part 11, which can effectively separate the first combined flow path and the second combined flow path. The first combined flow path is the flow path formed by the coolant inlet 111, the first connecting hole 211 and the outer cooling chamber 4. The second combined flow path is the flow path formed by the second flow hole and the coolant outlet 112. This can effectively prevent the coolant from flowing directly from the coolant inlet 111 and / or the outer cooling chamber 4 and / or the first connecting hole 211 to the second combined flow path. Secondly, in this embodiment, as Figure 1-3 As shown, the area between the second communicating hole 212 and the third sealing member 63 on the outer circumferential wall of the support sleeve 2 is interference-fitted with the first cylinder body 11. In conjunction with the use of the third sealing member 63, the coolant can be effectively prevented from leaking from the area between the second communicating hole 212 and the third sealing member 63 on the outer circumferential wall of the support sleeve 2. Figure 1-3 As shown, the area on the outer circumferential wall of the support sleeve 2, which is away from the second communicating hole 212 relative to the third sealing member 63, also has an interference fit with the first cylinder portion 11, which can further prevent the coolant from leaking from the area on the outer circumferential wall of the support sleeve 2 between the second communicating hole 212 and the third sealing member 63. This further improves the cooling effect of the first cylinder portion 11, the support sleeve 2, and the cylinder liner 3.

[0065] Specifically, if Figure 3 As shown, the first cylinder body 11 is provided with a first mounting hole 113 , and the support sleeve 2 is interference-inserted into the first mounting hole 113 .

[0066] Specifically, if Figure 3 As shown, the second cylinder body 12 is provided with a second mounting hole 122 , and the cylinder sleeve 3 is loosely inserted into the second mounting hole 122 .

[0067] Among them, such as Figure 4 As shown, the support sleeve 2 includes a partition portion 21 and a support portion 22 connected along the axial direction, a second support surface 221 is formed on the support portion 22, and the second support surface 221 is located at the connection between the partition portion 21 and the support portion 22 along the axial direction of the support sleeve 2. The partition portion 21 is transitionally fitted with the cylinder liner 3. The support portion 22 is clearance-fitted with the cylinder liner 3. The aluminum cylinder body 1 is clearance-fitted with the cylinder liner 3. It can be understood that the second cylinder body portion 12 is clearance-fitted with the cylinder liner 3. Specifically, the support portion 22 is clearance-fitted with the cylinder liner 3, and the second cylinder body portion 12 is clearance-fitted with the cylinder liner 3, so that during assembly, the cylinder liner 3 can be well plugged into the support portion 22 and the second cylinder body portion 12. The partition portion 21 is transitionally fitted with the cylinder liner 3 to ensure that the central axis of the support sleeve 2 is collinear with the central axis of the cylinder liner 3.

[0068] Specifically, except for the area where the first seal 61 is provided, the area where the inner cooling chamber 5 is provided, the area where the first connecting hole 211 is provided, and the area where the second connecting hole 212 is provided, the remaining area on the inner peripheral wall of the support portion 22 is transitionally matched with the cylinder liner 3. In this embodiment, as shown in FIG. Figure 1 and Figure 4 As shown, along the axial direction of the support portion 22 , an area on the inner peripheral wall of the support portion 22 , which is away from the inner cooling chamber 5 relative to the first sealing member 61 , is transitionally fitted with the cylinder liner 3 .

[0069] In this embodiment, if Figure 1 and Figure 4 As shown, the first communication hole 211 and the second communication hole 212 are both provided in the partition portion 21 .

[0070] Specifically, if Figure 4 As shown, the partition 21 is provided with a third mounting hole 213 , and the cylinder sleeve 3 is transitionally matched with the third mounting hole 213 .

[0071] Specifically, if Figure 4 As shown, the support portion 22 is provided with a fourth mounting hole 222, and the cylinder sleeve 3 is in clearance fit with the fourth mounting hole 222. Figure 1-4 As shown, the diameter of the second mounting hole 122 is equal to the diameter of the fourth mounting hole 222 .

[0072] It is understandable that if Figure 4 As shown, the diameter of the fourth mounting hole 222 is smaller than the diameter of the third mounting hole 213. The central axis of the fourth mounting hole 222 is collinear with the central axis of the third mounting hole 213.

[0073] Specifically, if Figure 5 As shown, the cylinder liner 3 is provided with a central working hole 32 .

[0074] like Figure 1-5 As shown, when the support sleeve 2 is assembled on the aluminum cylinder body 1, the center axis of the first mounting hole 113, the center axis of the second mounting hole 122, the center axis of the third mounting hole 213, the center axis of the fourth mounting hole 222 and the center axis of the central working hole 32 are all collinear.

[0075] like Figure 1-5 As shown, after the support sleeve 2 is assembled on the aluminum cylinder body 1, the end surface of the first cylinder body part 11 axially away from the second cylinder body part 12, the end surface of the partition part 21 axially away from the support part 22 and the end surface of the cylinder sleeve 3 axially close to the support sleeve 2 are all coplanar.

[0076] Specifically, if Figure 1-5 As shown in the figure, the processing and assembly process of the engine cylinder structure is as follows:

[0077] The aluminum cylinder body 1 is machined to form the first mounting hole 113, the second mounting hole 122, and the first support surface 121. Specifically, the first mounting hole 113 and the first support surface 121 are both machined directly into place. Ensure that the areas on the inner circumferential wall of the first mounting hole 113 that are interference-fit with the outer circumferential wall of the support sleeve 2 have good coaxiality. Ensure that the first support surface 121 has good flatness. Specifically, a certain machining allowance is retained for the second mounting hole 122. This facilitates adjustment of the aperture of the fourth mounting hole 222 to be equal to the aperture of the second mounting hole 122.

[0078] Process the support sleeve 2 to form the third mounting hole 213, the fourth mounting hole 222 and the second supporting surface 221. Specifically, the outer peripheral wall of the support sleeve 2 is directly processed into place. Ensure that the areas on the outer peripheral wall of the support sleeve 2 that are interference fit with the first cylinder body part 11 have good coaxiality. Specifically, the third mounting hole 213 and the second supporting surface 221 are both directly processed into place. Ensure that the support sleeve 2 can directly transition fit with the cylinder sleeve 3. Ensure that the second supporting surface 221 has good flatness. Specifically, a certain processing allowance is retained for the fourth mounting hole 222. This is to facilitate adjustment of the aperture of the fourth mounting hole 222 to be equal to the aperture of the second mounting hole 122.

[0079] The center working hole 32 and the lap surface 31 are machined on the cylinder liner 3 .

[0080] The third sealing member 63 is sleeved on the outer peripheral wall of the support sleeve 2. The support sleeve 2 and the third sealing member 63 form a first combined structure.

[0081] The aluminum cylinder body 1 is heated, and the first combined structure is assembled in the first mounting hole 113 of the aluminum cylinder body 1. The support sleeve 2 is interference fit with the first mounting hole 113. The support sleeve 2 is axially supported on the first support surface 121. The third seal 63 is pressed against the inner circumferential wall of the first mounting hole 113. Specifically, to ensure good positioning, the aluminum cylinder body 1 is heated so that the support sleeve 2 is interference fit with the first mounting hole 113. When the support sleeve 2 is axially inserted into place, the support sleeve 2 is axially supported on the first support surface 121, and the third seal 63 is pressed against the inner circumferential wall of the first mounting hole 113.

[0082] The second mounting hole 122 and the fourth mounting hole 222 are machined in place so that the inner circumferential wall of the second mounting hole 122 and the inner circumferential wall of the fourth mounting hole 222 are coplanar, and both have good flatness, and the central axis of the second mounting hole 122, the central axis of the third mounting hole 213, and the central axis of the fourth mounting hole 222 are all collinear.

[0083] The first sealing member 61 and the second sealing member 62 are both sleeved on the outer peripheral wall of the cylinder liner 3. The first sealing member 61, the second sealing member 62 and the cylinder liner 3 form a second combined structure.

[0084] The second assembly structure is assembled in the second mounting hole 122, the third mounting hole 213, and the fourth mounting hole 222. The partition portion 21 is transitionally fitted with the cylinder liner 3, the support portion 22 and the second cylinder portion 12 are both clearance-fitted with the cylinder liner 3, the overlapping surface 31 overlaps the second supporting surface 221, the first sealing member 61 is pressed against the inner circumferential wall of the third mounting hole 213, and the second sealing member 62 is pressed against the inner circumferential wall of the second mounting hole 122.

[0085] The utility model also provides an engine, comprising the above-mentioned engine cylinder structure.

[0086] By adopting the above-mentioned engine cylinder structure, the size of the engine can be effectively reduced, the lightweight effect of the engine can be improved, and the service life of the engine can be increased; secondly, the difficulty of assembling the engine can be effectively reduced and the assembly efficiency of the engine can be improved.

[0087] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The engine cylinder structure is characterized by: include: An aluminum cylinder (1), wherein the inner peripheral wall of the aluminum cylinder (1) is formed with a first supporting surface (121); A support sleeve (2) is fixedly inserted into the aluminum cylinder body (1) along the axial direction and supported on the first support surface (121); a second support surface (221) is formed on the inner peripheral wall of the support sleeve (2); A cylinder sleeve (3) is fixedly inserted into the support sleeve (2) and the aluminum cylinder body (1) along the axial direction; a lap joint surface (31) is formed on the outer peripheral wall of the cylinder sleeve (3), and the lap joint surface (31) is lap jointed with the second support surface (221) along the axial direction of the cylinder sleeve (3); The central axis of the support sleeve (2) is collinear with the central axis of the cylinder sleeve (3).

2. The engine cylinder structure according to claim 1, characterized in that: The aluminum cylinder body (1) comprises a first cylinder body portion (11) and a second cylinder body portion (12) connected in the axial direction, the first supporting surface (121) is formed on the second cylinder body portion (12), and the first supporting surface (121) is located at the connection between the first cylinder body portion (11) and the second cylinder body portion (12) in the axial direction of the aluminum cylinder body (1); the support sleeve (2) is fixedly inserted in the first cylinder body portion (11) in the axial direction and supported on the first supporting surface (121); an outer cooling chamber (4) is formed between the inner peripheral wall of the first cylinder body portion (11) and the outer peripheral wall of the support sleeve (2).

3. The engine cylinder structure according to claim 2, characterized in that: An inner cooling chamber (5) is formed between the inner peripheral wall of the support sleeve (2) and the outer peripheral wall of the cylinder sleeve (3), and the outer cooling chamber (4) is communicated with the inner cooling chamber (5).

4. The engine cylinder structure according to claim 3, characterized in that: Along the axial direction of the support sleeve (2), one portion of the outer cooling chamber (4) and the inner cooling chamber (5) is located above the other.

5. The engine cylinder structure according to claim 3, characterized in that: The first cylinder body (11) is further provided with a cooling liquid inlet (111) and a cooling liquid outlet (112); one of the outer cooling chamber (4) and the inner cooling chamber (5) is communicated with the cooling liquid inlet (111), and the other of the outer cooling chamber (4) and the inner cooling chamber (5) is communicated with the cooling liquid outlet (112); the caliber of the cooling liquid inlet (111) is larger than the caliber of the cooling liquid outlet (112).

6. The engine cylinder structure according to claim 3, characterized in that: The engine cylinder block structure further comprises a first seal (61) and a second seal (62), wherein the first seal (61) is used to seal the gap between the support sleeve (2) and the cylinder liner (3), and the second seal (62) is used to seal the gap between the second cylinder block portion (12) and the cylinder liner (3); along the axial direction of the cylinder liner (3), the inner cooling chamber (5) is located between the first seal (61) and the second seal (62).

7. The engine cylinder structure according to claim 2, characterized in that: The engine cylinder structure further comprises a third seal (63), the third seal (63) being used to seal the gap between the first cylinder portion (11) and the support sleeve (2); along the axial direction of the aluminum cylinder (1), the third seal (63) is away from the second cylinder portion (12) relative to the outer cooling chamber (4).

8. The engine cylinder structure according to any one of claims 1 to 7, characterized in that: The support sleeve (2) is interference-inserted into the aluminum cylinder body (1).

9. The engine cylinder structure according to any one of claims 1 to 7, characterized in that: The support sleeve (2) comprises a partition portion (21) and a support portion (22) connected in an axial direction, the second support surface (221) is formed on the support portion (22), and the second support surface (221) is located at the connection between the partition portion (21) and the support portion (22) in the axial direction of the support sleeve (2); the partition portion (21) and the cylinder sleeve (3) are transitionally matched; the support portion (22) and the cylinder sleeve (3) are clearance matched; and the aluminum cylinder body (1) and the cylinder sleeve (3) are clearance matched.

10. An engine, characterized in that The engine cylinder structure comprises the engine cylinder structure according to any one of claims 1 to 9.

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