Engine cylinder block with herringbone stress structure

Abstract

The application discloses an engine cylinder body with a H-shaped stress structure, which comprises a cylinder body assembly, a crankcase and a main bearing cover. The cylinder body assembly integrates a cylinder head and a cylinder sleeve, and the cylinder body assembly omits a cylinder head gasket and cylinder head bolts. The crankcase is connected with the cylinder body assembly. The main bearing cover fastens the cylinder body assembly and the cylinder body together through main bearing cover bolts. The part of the main bearing cover bolts that extends into the cylinder head has a threaded section. The cylinder body assembly has a cooling liquid oil channel, and cooling liquid flows through the cooling liquid oil channel inside the cylinder body assembly. Therefore, the engine cylinder body with the H-shaped stress structure has a simple and reasonable structure, can solve the problem of tension pressure change at the root of the composite cylinder head cylinder hole, and avoids cracks.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, and in particular to an engine cylinder block having a U-shaped force-bearing structure. Background Technology

[0002] like Figure 1 As shown, in the existing cylinder block with integrated cylinder bore composite cylinder head, the main bearing cap bolt 3 fastens the composite cylinder head and cylinder block together. When the engine is running, the top surface of the cylinder liner is subjected to the upward force of high-temperature and high-pressure gas. Because the threaded section 4 is located in the lower part of the cylinder head 1, the force on the entire cylinder liner 2 is concentrated at the rounded corner of the cylinder bore, while the wall of the cylinder liner 2 is subjected to the downward pull of the main bearing cap bolt 3. This type of tensile force easily leads to the concentration of force at the rounded corner of the bottom surface of the cylinder liner 2, which is prone to cracking.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide an engine cylinder block with a U-shaped force-bearing structure. The structure is simple and reasonable, which can solve the problem of tensile and compressive stress at the root of the cylinder head of a composite cylinder head and avoid cracking.

[0005] To achieve the above objectives, the present invention provides an engine cylinder block with a U-shaped load-bearing structure, including a cylinder block assembly, a crankcase, and a main bearing cap. The cylinder block assembly integrates the cylinder head and cylinder liner, and eliminates the need for cylinder head gaskets and cylinder head bolts. The crankcase is connected to the cylinder block assembly. The main bearing cap is fastened to the cylinder block assembly by main bearing cap bolts. The portion of the main bearing cap bolts extending into the cylinder head has a threaded section. The cylinder block assembly has coolant passages, through which coolant flows within the cylinder block assembly.

[0006] In one embodiment of the invention, the threaded section is located outside the coolant passage, thereby keeping the threaded section away from the cylinder liner.

[0007] In one embodiment of the present invention, the cylinder block assembly is integrally cast.

[0008] In one embodiment of the present invention, the lower part of the threaded section of the main bearing cap bolt and the bolt mounting surface of the main bearing cap are both through-holes.

[0009] In one embodiment of the present invention, the crankcase and the main bearing cap are fixedly connected to the cylinder block assembly by main bearing cap bolts.

[0010] In one embodiment of the present invention, the cylinder block assembly is made of steel.

[0011] Compared with the prior art, the engine cylinder block with a U-shaped force-bearing structure according to the present invention has a simple and reasonable structure, which can solve the problem of tensile and compressive stress at the root of the cylinder head of the composite cylinder head and avoid cracking. Attached Figure Description

[0012] Figure 1 This is a partial cross-sectional view of an existing cylinder block;

[0013] Figure 2 This is a partial cross-sectional structural schematic diagram of an engine cylinder block having a U-shaped force-bearing structure according to an embodiment of the present invention.

[0014] Explanation of key figure labels:

[0015] 1-Cylinder head, 2-Cylinder liner, 3-Main bearing cap bolt, 4-Threaded section, 5-Coolant oil passage, 6-Through hole, 7-Cylinder head top surface, 8-Cylinder head outer wall. Detailed Implementation

[0016] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0017] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0018] Figure 2 This is a partial cross-sectional view of an engine cylinder block with a U-shaped load-bearing structure according to an embodiment of the present invention. Figure 2 As shown, an engine cylinder block with a U-shaped load-bearing structure according to a preferred embodiment of the present invention includes a cylinder block assembly, a crankcase, and a main bearing cap. The cylinder block assembly integrates a cylinder head 1 and a cylinder liner 2, and the cylinder block assembly omits the cylinder head 1 gasket and cylinder head 1 bolts. The crankcase is connected to the cylinder block assembly. The main bearing cap is fastened to the cylinder block assembly by main bearing cap bolts 3. The portion of the main bearing cap bolt 3 extending into the cylinder head 1 has a threaded section 4. The cylinder block assembly has a coolant passage 5, through which coolant flows within the cylinder block assembly.

[0019] In one embodiment of the present invention, the threaded section 4 is located outside the coolant passage 5, thereby moving the threaded section 4 away from the cylinder liner 2.

[0020] In one embodiment of the present invention, the cylinder block assembly is integrally cast.

[0021] In one embodiment of the present invention, the lower part of the threaded section 4 of the main bearing cap bolt 3 and the bolt mounting surface of the main bearing cap are both through the bolt hole 6.

[0022] In one embodiment of the present invention, the crankcase and the main bearing cover are fixedly connected to the cylinder block assembly by the main bearing cover bolts 3.

[0023] In one embodiment of the present invention, the cylinder block assembly is made of steel.

[0024] In practical applications, the engine cylinder block of the present invention, which has a U-shaped load-bearing structure, has the threaded section 4 of the main bearing cap bolt 3 located on the outer side of the coolant passage 5, separate from the cylinder liner 2. The portion below the threaded section 4 of the main bearing cap bolt 3 to the mounting surface of the main bearing cap bolt 3 consists of through-holes 6. The present invention mainly relates to the cylinder head 1, cylinder liner 2, cylinder head top surface 7, cylinder head outer wall 8, cylinder bore water jacket (coolant passage 5), through-holes 6, main bearing cap bolt 3, main bearing cap, and cylinder block.

[0025] When the internal combustion engine is working, high-pressure gas is generated in the cylinder bore (cylinder liner 2). The high-pressure gas exerts a great force on the top surface 7 of the cylinder head, and the force is eventually transmitted to the main bearing cap bolt 3. Under the stress condition of the cylinder head 1, the main bearing cap bolt 3 pulls the outer wall 8 of the cylinder head downward through the threaded section 4. The downward pull of the main bearing cap bolt 3 on both sides causes the top surface of the cylinder bore (top surface of the cylinder liner 2) to generate downward pressure, which greatly improves the stress concentration problem at this point and greatly enhances the strength at this point.

[0026] In summary, the engine cylinder block of the present invention with a U-shaped force-bearing structure has a simple and reasonable structure, which can solve the problem of tensile and compressive stress at the root of the cylinder head of a composite cylinder head and avoid cracking.

[0027] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An engine cylinder block with a U-shaped load-bearing structure, characterized in that, include: The cylinder block assembly integrates the cylinder head and cylinder liner, and the cylinder block assembly omits the cylinder head gasket and cylinder head bolts; The crankcase is connected to the cylinder block assembly; as well as The main bearing cap is used to fasten the cylinder block assembly to the cylinder block using main bearing cap bolts. The portion of the main bearing cap bolt that extends into the cylinder head has a threaded section; The cylinder block assembly has a coolant oil passage, and coolant flows through the coolant oil passage inside the cylinder block assembly. The threaded section is located outside the coolant passage, thereby keeping the threaded section away from the cylinder liner; Wherein, the lower part of the threaded section of the main bearing cap bolt to the bolt mounting surface of the main bearing cap are all through-holes.

2. The engine cylinder block with a U-shaped force-bearing structure as described in claim 1, characterized in that, The cylinder block assembly is integrally cast.

3. The engine cylinder block with a U-shaped load-bearing structure as described in claim 1, characterized in that, The crankcase and the main bearing cap are fixedly connected to the cylinder block assembly by the main bearing cap bolts.

4. The engine cylinder block with a U-shaped load-bearing structure as described in claim 1, characterized in that, The cylinder block assembly is made of steel.

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