Cylinder sleeve-free cylinder block structure and design method

Abstract

The invention relates to a cylinder liner-free cylinder block structure and a design method. The structure comprises a cylinder body top plate arranged at the top of a cylinder body; the water jacket is arranged between the two cylinders, is a casting solid body and is used for reducing deformation of the cylinder barrel; the inter-cylinder cross hole is formed between the two cylinders, and the inter-cylinder cross hole is filled with a casting solid and used for cooling the space between the two cylinders through water flow to reduce deformation caused by thermal load. Through the structural size matching design of the cylinder body top plate, the cylinder cover bolt hole and the cylinder barrel thickness, the cylinder barrel deformation caused by assembly is reduced while the cooling requirement of the cylinder barrel is met; the deformation resistance of the cylinder body is greatly improved through the structural design of removing the inter-cylinder water jacket, meanwhile, the inter-cylinder crossed water holes are designed, the inter-cylinder cooling requirement is met, and the thermal load of the cylinder body is reduced; deformation of the cylinder barrel is greatly reduced, the effects of reducing engine oil consumption, piston ring set abrasion and engine oil consumption are obvious, and the reliability of an engine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine structure design, and in particular to a cylinder body structure without a cylinder liner and a design method. Background Art

[0002] With the increasing awareness of environmental protection and the rapid progress of automobile technology, energy conservation and emission reduction have become important requirements that cannot be ignored, and users' attention to vehicle fuel consumption has also continued to rise. The engine block is the main body of the engine. It connects the cylinders and the crankcase together and is the supporting frame for installing the piston, crankshaft and other parts and accessories. The following is a detailed introduction to the engine block:

[0003] Organize and determine the position of each component: The cylinder block provides a stable support structure for each component in the engine, ensuring that they can be correctly positioned. Ensure the specification accuracy of key components: The high-precision processing of the cylinder block ensures the smooth operation of key components such as the piston and crankshaft. Accommodate cooling water and adjust the temperature difference: A cooling water jacket is designed inside the cylinder block so that the cooling water can efficiently take away heat and keep the engine within a suitable operating temperature range. The cylinder block material should have sufficient strength, good castability and machinability, and the price should be low. Therefore, the commonly used cylinder block materials are cast iron and alloy cast iron. However, the use of aluminum alloy cylinder blocks is becoming more and more common because aluminum alloy cylinder blocks are light in weight, have good thermal conductivity, and the capacity of coolant can be reduced. The cylinder block assembly includes the cylinder head, cylinder block, and oil pan. Some engines divide the cylinder block into two parts, the upper part is called the cylinder block, and the lower part is called the crankcase.

[0004] The cylinder block is a metal cylindrical structure, usually made of materials such as cast iron or aluminum alloy. It has sufficient strength and rigidity to withstand the reciprocating motion of the piston and the high temperature and high pressure working environment. The inside of the cylinder block is processed with a fine smooth surface to reduce friction loss and improve sealing performance. The piston is the moving part in the cylinder block, usually made of aluminum alloy. During operation, the piston and the cylinder block form a sealed working chamber. When the piston moves downward, the gas in the chamber is compressed, increasing the pressure and temperature of the gas. Subsequently, the ignition system ignites the mixed gas, causing it to explode and burn. The high temperature and high pressure gas generated by the combustion pushes the piston upward. The cylinder block also carries connections with other components, such as valves, oil pans, and cooling systems. The valves are connected to the working chamber through the valve seats of the cylinder block to realize the in and out of the gas. The oil pan is connected to the lower part of the cylinder block and plays the role of carrying the oil pan and lubrication system. The cooling system provides a diffusion surface for heat dissipation through the cylinder block to keep the engine operating temperature stable.

[0005] In summary, the engine block is a key component of the engine, and its design, manufacturing and performance have a vital impact on the overall performance of the engine.

[0006] In order to achieve lower fuel consumption, engine technology must be continuously innovated, and increasing the explosion pressure is a key method. However, although this method can effectively reduce fuel consumption, it also puts a greater load on the cylinder body, causing the cylinder deformation problem to become more prominent.

[0007] In the face of this challenge, innovative design is particularly important. We need to propose a better cylinder block structure design through in-depth research and careful design. Such a design is intended to effectively deal with the problem of cylinder deformation under high explosion pressure requirements, thereby significantly reducing fuel consumption and oil consumption while ensuring engine performance. What is more worth mentioning is that the optimized cylinder block structure can also greatly improve the reliability of the engine, bringing users a more stable and efficient driving experience.

[0008] Patent CN201710154761.6 provides an engine cylinder block structure, which is a gasoline engine cylinder block. It mainly describes that the cylinder deformation is reduced by controlling the cylinder wall thickness, the distribution position of the water holes, and the upper and lower water jacket structures. It is obviously different from the single-layer water jacket structure and wall thickness of the diesel engine cylinder block of the present invention, and does not explain the influence of the inter-cylinder water jacket structure and the screwing position of the water jacket and the cylinder head bolts on the cylinder deformation. Patent CN202311434283.6 provides a device for reducing the deformation of the cylinder liner, which mainly describes that the cylinder deformation is reduced by designing a cylinder liner, and at the same time provides a structural design method of the cylinder liner, which is obviously different from the cylinder block without a cylinder liner of the present invention.

[0009] With the development of engine technology, emission reduction requirements are becoming increasingly stringent, and users are placing higher and higher demands on vehicle fuel consumption.

[0010] In traditional technology, engines need to reduce fuel consumption by increasing the explosion pressure and other technical means. However, increasing the explosion pressure will increase the load on the cylinder body, causing the cylinder deformation to continue to increase.

[0011] However, the current increased explosion pressure has continuously increased the load on the cylinder body, resulting in continued increase in cylinder deformation. Summary of the invention

[0012] Based on this, a linerless cylinder block structure and design method is provided, which greatly reduces the deformation of the cylinder barrel, has obvious effects on reducing engine fuel consumption, reducing piston ring group wear, and reducing engine oil consumption, thereby improving engine reliability.

[0013] In a first aspect, the present application provides a cylinder block structure without a cylinder liner, the structure comprising:

[0014] A cylinder top plate, disposed on the top of the cylinder; and

[0015] A water jacket is disposed between the two cylinders and is a casting entity used to reduce deformation of the cylinder barrel; and

[0016] The inter-cylinder cross hole is arranged between the two cylinders. The inter-cylinder cross hole is filled with a casting entity and is used to cool the space between the two cylinders through water flow to reduce deformation caused by heat load.

[0017] The structure also includes:

[0018] The cylinder head bolt screwing thread is arranged on the top surface of the cylinder body, and a countersunk hole is arranged above the cylinder head bolt screwing thread.

[0019] The structure also includes:

[0020] The cylinder barrel increases the rigidity of the cylinder barrel body and reduces the overall deformation of the cylinder barrel by controlling the wall thickness of the cylinder barrel.

[0021] The wall thickness of the cylinder top plate is 12-22mm, which is used to improve the rigidity of the cylinder top plate and suppress the circumferential deformation within 15-30mm of the upper part of the cylinder.

[0022] The cylinder top plate is kept at a distance from the top dead center of the piston ring to improve the cooling capacity of the piston and the rigidity of the cylinder top surface.

[0023] The cylinder head bolt countersink depth of the cylinder head bolt thread is controlled at 20-40mm, and the cylinder head bolt thread engagement position is controlled in the middle of the water jacket, which is used to suppress the fourth-order cylinder deformation caused by the cylinder head bolt axial force on the left and right sides of the cylinder body.

[0024] The width of the water jacket casting should maintain a gap of 10-15mm with the cylinder head bolts.

[0025] The cross hole between cylinders forms an angle of 35-65° with the top surface of the cylinder body.

[0026] In a second aspect, the present application further provides a method for designing a cylinder block structure without a cylinder liner, which is used to design the above structure, and the method comprises:

[0027] The cylinder top plate adopts reasonable size and maintains a suitable position relationship with the top dead center of the piston ring, which can improve the cooling capacity of the piston, improve the rigidity of the cylinder top surface, and minimize the deformation of the cylinder top surface and the cylinder barrel within 15-25mm from the top surface;

[0028] The screwing thread of the cylinder head bolt is designed with reasonable cylinder head bolt countersink depth and thread length to maintain a reasonable axial force after the cylinder head bolt is assembled, thereby reducing the deformation of the middle section of the cylinder barrel caused by the cylinder head bolt assembly; at the same time, the screwing thread of the cylinder head bolt maintains a reasonable position relationship with the water jacket, thereby reducing the deformation of the cylinder barrel caused by uneven screwing force;

[0029] By designing a reasonable wall thickness of the cylinder, the rigidity of the cylinder body is improved and the overall deformation of the cylinder is reduced;

[0030] The cross hole between the cylinders fills the gap between the two cylinders with a casting solid, which improves the rigidity and strength between the cylinders and greatly reduces the deformation of the cylinder barrel; at the same time, water can cool the gap between the two cylinders through the cross hole between the cylinders, reducing the deformation caused by the heat load;

[0031] The depth of the cylinder head bolt countersink for the cylinder head bolt thread is controlled at 20-40mm, and the cylinder head bolt thread thread engagement position is controlled in the middle of the water jacket, which can effectively suppress the fourth-order cylinder deformation caused by the cylinder head bolt axial force on the left and right sides of the cylinder body;

[0032] The water jacket is cast as a solid body between the two cylinders, which can effectively reduce the deformation of the front and rear sides of the upper part of the cylinder caused by the water arch bridge structure.

[0033] The wall thickness of the cylinder top plate is set to 12-22mm, which can effectively improve the rigidity of the cylinder top plate and suppress the circumferential deformation within 15-30mm of the upper part of the cylinder; the width of the water jacket casting entity maintains a gap of 10-15mm with the cylinder head bolt saddle, and the inter-cylinder cross hole forms an angle of 35-65° with the top surface of the cylinder body, ensuring that the bottom of the inter-cylinder cross hole is basically maintained in the middle of the water jacket without affecting the processing process; and it can ensure that the intersection position is close to the top dead center of the piston ring to meet the cooling requirements of the top dead center of the piston ring.

[0034] The above-mentioned cylinder block structure and design method without a cylinder liner, through the structural size matching design of the cylinder block top plate, cylinder head bolt hole, and cylinder thickness, can reduce the deformation of the cylinder caused by assembly while meeting the cooling requirements of the cylinder; the structural design of removing the water jacket between cylinders greatly improves the deformation resistance of the cylinder block, and at the same time designs the cross water holes between cylinders to meet the cooling requirements between cylinders and reduce the thermal load of the cylinder block. The present invention greatly reduces the deformation of the cylinder, has obvious effects on reducing engine fuel consumption, reducing piston ring group wear, and reducing engine oil consumption, and improves engine reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic diagram showing the position and shape of the cross holes between cylinders on the top surface in one embodiment of the present invention;

[0036] FIG2 is a schematic diagram showing the positional relationship between the cylinder barrel and the cross holes between cylinders in one embodiment of the present invention;

[0037] 3 is a schematic diagram of the positional relationship among the screw thread, countersunk hole and water jacket of the cylinder head bolt in one embodiment of the present invention;

[0038] FIG. 4 is a schematic diagram of the relationship between the cross holes and water jackets between cylinders in one embodiment of the present invention.

[0039] The reference numerals in the specific implementation manner are as follows:

[0040] Cylinder block top plate 1, cylinder head bolt thread 2, cylinder barrel 3, cylinder cross hole 4, countersunk hole 5, water jacket a. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0048] Refer to Figure 1, which shows a schematic diagram of the position and shape of the inter-cylinder cross hole on the top surface in an embodiment of the present invention. An embodiment of the present invention provides a cylinder block structure without a cylinder liner, which includes a cylinder block top plate 1, a cylinder head bolt thread 2, a cylinder barrel 3, an inter-cylinder cross hole 4, a countersunk hole 5, a water jacket a and other structures. It adopts a new structural form and size combination, which not only meets the cooling requirements, but also solves the problem of large deformation of the cylinder barrel 3.

[0049] In one embodiment, the cylinder top plate 1 adopts a reasonable size and maintains a suitable positional relationship with the top dead center of the piston ring, which can improve the piston cooling capacity and the rigidity of the cylinder top surface, thereby minimizing the deformation of the cylinder top surface and the cylinder barrel 3 within 15-25 mm from the top surface.

[0050] In one embodiment, the wall thickness of the cylinder top plate 1 is set to 12-22 mm, which can effectively improve the rigidity of the cylinder top plate 1 and suppress the circumferential deformation within 15-30 mm of the upper part of the cylinder.

[0051] In one embodiment, the cylinder head bolt thread 2 maintains a reasonable axial force after the cylinder head bolt is assembled by designing a reasonable depth and thread length of the cylinder head bolt countersunk hole 5, thereby reducing the deformation of the middle section of the cylinder barrel 3 caused by the cylinder head bolt assembly. At the same time, the cylinder head bolt thread 2 maintains a reasonable positional relationship with the water jacket a, thereby reducing the deformation of the cylinder barrel 3 caused by uneven screwing force.

[0052] In one embodiment, the cylinder 3 improves the rigidity of the cylinder 3 body and reduces the overall deformation of the cylinder 3 by designing a reasonable wall thickness of the cylinder 3. The advantage of this cylinder structure is that, through the structural size matching design of the cylinder top plate 1, the cylinder head bolt hole, and the thickness of the cylinder 3, the deformation of the cylinder 3 caused by assembly is reduced while meeting the cooling requirements of the cylinder 3; the structural design of removing the water jacket a between cylinders greatly improves the deformation resistance of the cylinder, and at the same time, the cross water holes between cylinders are designed to meet the cooling requirements between cylinders and reduce the thermal load of the cylinder. The present invention greatly reduces the deformation of the cylinder 3, has obvious effects on reducing engine fuel consumption, reducing piston ring group wear, and reducing engine oil consumption, and improves engine reliability.

[0053] In one embodiment, the inter-cylinder cross hole 4 fills the space between the two cylinders with a cast solid, thereby improving the rigidity and strength between the cylinders and greatly reducing the deformation of the cylinder barrel 3; at the same time, in order to meet the cooling needs between the cylinders, the inter-cylinder cross hole 4 is designed, and water flow can cool the space between the two cylinders through the inter-cylinder cross hole 4, thereby reducing the deformation caused by the heat load.

[0054] In one embodiment, the depth of the cylinder head bolt countersunk hole 5 of the cylinder head bolt thread 2 is controlled at 20-40 mm, and the cylinder head bolt thread engagement position is controlled at the middle position of the water jacket a, which can effectively suppress the fourth-order cylinder deformation on the left and right sides of the cylinder body caused by the axial force of the cylinder head bolt.

[0055] In one embodiment, the water jacket a is cast as a solid body between the cylinders, which is significantly different from the commonly used water arch bridge solution between cylinders. Since it is entirely a cast solid body, the deformation of the front and rear sides of the upper part of the cylinder 3 caused by the water arch bridge structure can be effectively reduced.

[0056] In one embodiment, the width of the casting entity of the water jacket a maintains a gap of 10-15 mm with the cylinder head bolt clasp, the purpose of which is to ensure the casting processability and ensure that the yield rate of the sand core production of the water jacket a and the casting yield rate meet the production requirements.

[0057] In one embodiment, the inter-cylinder cross hole 4 forms an angle of 35-65° with the top surface of the cylinder body, which ensures, on the one hand, that the bottom of the inter-cylinder cross hole 4 is basically maintained in the middle of the water jacket a without affecting the processing processability; on the other hand, it ensures that the intersection position is close to the top dead center of a piston ring to meet the cooling requirements of the top dead center of the ring.

[0058] In one embodiment, the deformation of the fourth-order cylinder barrel of the cylinder block without a cylinder liner can be controlled below 12 μm, effectively reducing the engine oil consumption and the wear of the cylinder barrel 3 and the piston ring group.

[0059] In one embodiment, the inter-cylinder cross hole 4 can be designed with a variety of angles, and the width of the inter-cylinder casting entity can also be adjusted according to the cooling requirements; the thickness of the cylinder top plate 1 can be uneven, and the thickness of the top plate between cylinders can be greater than the thickness of the top plates on both sides of the cylinder barrel 3; the actual shape of the cylinder water jacket a can be adjusted to other shapes according to the casting process.

[0060] In one embodiment, the deformation of both sides of the cylinder body due to the axial force after the cylinder head bolts are assembled is reduced by reasonably designing the water jacket a, the cylinder head bolt countersunk hole 5 and the threaded engagement position.

[0061] In one embodiment, the problem of deformation of the front and rear sides of the upper part of the cylinder barrel 3 of a cylinder body without a cylinder liner and with small cylinder spacing is solved by innovatively designing the inter-cylinder casting entity and the inter-cylinder cross hole 4 design.

[0062] The problems of increased deformation of the cylinder 3 and high oil consumption caused by high explosion pressure are solved through the reasonable coordination of various structural dimensions.

[0063] The advantage of this cylinder structure is that, through the structural size matching design of the cylinder top plate 1, the cylinder head bolt hole, and the thickness of the cylinder barrel 3, the deformation of the cylinder barrel 3 caused by assembly is reduced while meeting the cooling requirements of the cylinder barrel 3; the structural design of removing the water jacket a between cylinders greatly improves the anti-deformation ability of the cylinder, and at the same time, the cross water holes between cylinders are designed to meet the cooling requirements between cylinders and reduce the thermal load of the cylinder. The present invention greatly reduces the deformation of the cylinder barrel 3, has obvious effects on reducing engine fuel consumption, reducing piston ring group wear, and reducing engine oil consumption, and improves engine reliability.

[0064] In one embodiment, a method for designing a cylinder block structure without a cylinder liner is provided, the method comprising:

[0065] The cylinder top plate 1 adopts a reasonable size and maintains a suitable position relationship with the top dead center of the piston ring, which can improve the cooling capacity of the piston, improve the rigidity of the cylinder top surface, and minimize the deformation of the cylinder top surface and the cylinder barrel 3 within 15-25mm from the top surface;

[0066] The cylinder head bolt screw thread 2 maintains a reasonable axial force after the cylinder head bolt is assembled by designing a reasonable depth and thread length of the cylinder head bolt countersunk hole 5, thereby reducing the deformation of the middle section of the cylinder barrel 3 caused by the cylinder head bolt assembly; at the same time, the cylinder head bolt screw thread 2 maintains a reasonable positional relationship with the water jacket a, thereby reducing the deformation of the cylinder barrel 3 caused by uneven screwing force;

[0067] By designing a reasonable wall thickness of the cylinder barrel 3, the rigidity of the cylinder barrel 3 body is improved and the overall deformation of the cylinder barrel 3 is reduced; the advantage of the cylinder structure is that the structural dimensions of the cylinder top plate 1, the cylinder head bolt hole, and the thickness of the cylinder barrel 3 are matched to meet the cooling requirements of the cylinder barrel 3 while reducing the deformation of the cylinder barrel 3 caused by assembly; the structural design of removing the water jacket a between cylinders greatly improves the anti-deformation ability of the cylinder, and at the same time, the cross water holes between cylinders are designed to meet the cooling requirements between cylinders and reduce the thermal load of the cylinder. The present invention greatly reduces the deformation of the cylinder barrel 3, has obvious effects on reducing engine fuel consumption, reducing piston ring group wear, and reducing engine oil consumption, and improves engine reliability.

[0068] The inter-cylinder cross hole 4 fills the space between the two cylinders with a casting solid, which improves the rigidity and strength of the space between the cylinders and greatly reduces the deformation of the cylinder barrel 3. At the same time, water flow can cool the space between the two cylinders through the inter-cylinder cross hole 4, reducing the deformation caused by the heat load.

[0069] The depth of the cylinder head bolt countersunk hole 5 where the cylinder head bolt engages with the thread 2 is controlled to be 20-40 mm, and the engagement position of the cylinder head bolt thread is controlled to be in the middle of the water jacket a, which can effectively suppress the fourth-order cylinder deformation caused by the axial force of the cylinder head bolt on the left and right sides of the cylinder body;

[0070] The water jacket a is cast as a solid body between the two cylinders, which can effectively reduce the deformation of the front and rear sides of the upper part of the cylinder barrel 3 caused by the water arch bridge structure. The structural design of removing the water jacket a between the cylinders greatly improves the anti-deformation ability of the cylinder body, and the cross water holes between the cylinders are designed to meet the cooling requirements between the cylinders and reduce the thermal load of the cylinder body.

[0071] The wall thickness of the cylinder top plate 1 is set to 12-22mm, which can effectively improve the rigidity of the cylinder top plate 1 and suppress the circumferential deformation within 15-30mm of the upper part of the cylinder; the width of the water jacket casting entity maintains a gap of 10-15mm with the cylinder head bolt clasp, and the inter-cylinder cross hole 4 forms an angle of 35-65° with the top surface of the cylinder body, ensuring that the bottom of the inter-cylinder cross hole 4 is basically maintained in the middle of the water jacket a, without affecting the processing process; and it can ensure that the intersection position is close to the top dead center of the piston ring, meeting the cooling requirements of the top dead center of the ring.

[0072] The advantage of this cylinder structure is that, through the structural size matching design of the cylinder top plate 1, the cylinder head bolt hole, and the thickness of the cylinder barrel 3, the deformation of the cylinder barrel 3 caused by assembly is reduced while meeting the cooling requirements of the cylinder barrel 3; the structural design of removing the water jacket a between cylinders greatly improves the anti-deformation ability of the cylinder, and at the same time, the cross water holes between cylinders are designed to meet the cooling requirements between cylinders and reduce the thermal load of the cylinder. The present invention greatly reduces the deformation of the cylinder barrel 3, has obvious effects on reducing engine fuel consumption, reducing piston ring group wear, and reducing engine oil consumption, and improves engine reliability.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cylinder block structure without a cylinder liner, characterized in that: The structure comprises: A cylinder top plate, disposed on the top of the cylinder; and A water jacket is disposed between the two cylinders and is a casting entity used to reduce deformation of the cylinder barrel; and The inter-cylinder cross hole is arranged between the two cylinders. The inter-cylinder cross hole is filled with a casting entity and is used to cool the space between the two cylinders through water flow to reduce deformation caused by heat load.

2. The structure according to claim 1, characterized in that: The structure also includes: The cylinder head bolt screwing thread is arranged on the top surface of the cylinder body, and a countersunk hole is arranged above the cylinder head bolt screwing thread.

3. The structure according to claim 2, characterized in that: The structure also includes: The cylinder barrel increases the rigidity of the cylinder barrel body and reduces the overall deformation of the cylinder barrel by controlling the wall thickness of the cylinder barrel.

4. The structure according to claim 3, characterized in that The wall thickness of the cylinder top plate is 12-22mm, which is used to improve the rigidity of the cylinder top plate and suppress the circumferential deformation within 15-30mm of the upper part of the cylinder.

5. The structure according to claim 3, characterized in that: The cylinder top plate is kept at a distance from the top dead center of the piston ring to improve the cooling capacity of the piston and the rigidity of the cylinder top surface.

6. The structure according to any one of claims 1 to 5, characterized in that: The cylinder head bolt countersink depth of the cylinder head bolt thread is controlled at 20-40mm, and the cylinder head bolt thread engagement position is controlled in the middle of the water jacket, which is used to suppress the fourth-order cylinder deformation caused by the cylinder head bolt axial force on the left and right sides of the cylinder body.

7. The structure according to claim 5, characterized in that The width of the water jacket casting should maintain a gap of 10-15mm with the cylinder head bolts.

8. The structure according to claim 7, characterized in that The cross hole between cylinders forms an angle of 35-65° with the top surface of the cylinder body.

9. A method for designing a cylinder block structure without a cylinder liner, used for designing the structure according to any one of claims 1 to 8, characterized in that: The method comprises: The cylinder top plate adopts reasonable size and maintains a suitable position relationship with the top dead center of the piston ring, which can improve the cooling capacity of the piston, improve the rigidity of the cylinder top surface, and minimize the deformation of the cylinder top surface and the cylinder barrel within 15-25mm from the top surface; The screwing thread of the cylinder head bolt is designed with reasonable cylinder head bolt countersink depth and thread length to maintain a reasonable axial force after the cylinder head bolt is assembled, thereby reducing the deformation of the middle section of the cylinder barrel caused by the cylinder head bolt assembly; at the same time, the screwing thread of the cylinder head bolt maintains a reasonable position relationship with the water jacket, thereby reducing the deformation of the cylinder barrel caused by uneven screwing force; By designing a reasonable wall thickness of the cylinder, the rigidity of the cylinder body is improved and the overall deformation of the cylinder is reduced; The cross hole between the cylinders fills the gap between the two cylinders with a casting solid, which improves the rigidity and strength between the cylinders and greatly reduces the deformation of the cylinder barrel; at the same time, water can cool the gap between the two cylinders through the cross hole between the cylinders, reducing the deformation caused by the heat load; The depth of the cylinder head bolt countersink for the cylinder head bolt thread is controlled at 20-40mm, and the cylinder head bolt thread thread engagement position is controlled in the middle of the water jacket, which can effectively suppress the fourth-order cylinder deformation caused by the cylinder head bolt axial force on the left and right sides of the cylinder body; The water jacket is cast as a solid body between the two cylinders, which can effectively reduce the deformation of the front and rear sides of the upper part of the cylinder caused by the water arch bridge structure.

10. The method according to claim 9, characterized in that The wall thickness of the cylinder top plate is set to 12-22mm, which can effectively improve the rigidity of the cylinder top plate and suppress the circumferential deformation within 15-30mm of the upper part of the cylinder; the width of the water jacket casting entity maintains a gap of 10-15mm with the cylinder head bolt saddle, and the inter-cylinder cross hole forms an angle of 35-65° with the top surface of the cylinder body, ensuring that the bottom of the inter-cylinder cross hole is basically maintained in the middle of the water jacket without affecting the processing process; and it can ensure that the intersection position is close to the top dead center of the piston ring to meet the cooling requirements of the top dead center of the piston ring.

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