High-strength power unit structure

Abstract

Disclosed is a high-strength power unit structure, which is mounted on a cylinder block (8) of an engine. The high-strength power unit structure comprises: a cylinder liner support seat (2), a cylinder liner (3), a cylinder head (1) and a piston connecting rod assembly (4). The cylinder liner support seat (2) is detachably fixed to the cylinder block (8); the cylinder liner (3) is detachably fixed to the cylinder liner support seat (2); the cylinder head (1) is detachably fixed to the cylinder liner (3); and the piston connecting rod assembly (4) is mounted at the bottom of the cylinder liner (3). A first water jacket cavity (24) is provided between the cylinder liner support seat (2) and the cylinder liner (3), a second water jacket cavity (12) is provided between the cylinder liner support seat (2) and the cylinder head (1), and the first water jacket cavity (24) is in communication with the second water jacket cavity (12). The high-strength power unit structure is configured simply and rationally, has high strength and good reliability, and can bear an ultra-high explosion pressure.

Description

High-strength power unit structure TECHNICAL FIELD

[0001] The present application relates to the field of engine technology, in particular to a high-strength power unit structure. BACKGROUND

[0002] With the development of the industry, the power density of the internal combustion engine is getting larger and larger, and at the same time the explosion pressure of the internal combustion engine is also getting higher and higher, which poses a great challenge to the reliability of engine parts. In particular, for large-bore marine engines, reliability is particularly critical. How to improve the strength of the engine body to withstand higher explosion pressure is one of the main development directions of the engine.

[0003] The internal combustion engine is composed of thousands of parts, but overall it is still a device that generates power by burning fuel, so the power system is the most critical part inside the engine. The power system is mainly composed of cylinder block, cylinder head, cylinder sleeve, piston connecting rod and other parts, and the strength of these parts directly determines the explosion pressure bearing capacity of the engine.

[0004] For traditional engines, the cylinder sleeve is generally directly installed on the cylinder block, and then the cylinder sleeve is pressed into the cylinder block and the top surface of the sleeve. Because the cooling water jacket must be reserved between the cylinder block and the cylinder sleeve, the strength of the cylinder block mounting sleeve position is insufficient, which can easily cause cylinder hole deformation, resulting in serious failures such as cylinder pulling. The cylinder block is provided with a cooling water cavity, and if the sealing design is unreasonable or the sealing ring fails due to aging, the cooling water will leak into the engine oil pan, and then cause other engine failures.

[0005] The information disclosed in this BACKGROUND section is only intended to increase an understanding of the general context in which the present application can be practiced. It will be apparent that the information in this BACKGROUND section can not be prior art to the claimed application, and it should not be construed as suggesting that the methods and systems described in this BACKGROUND section are known prior art in the jurisdiction in which the application is being filed.

[0006] SUMMARY

[0007] The purpose of the present application is to provide a high-strength power unit structure, which has simple and reasonable structure, high strength, good reliability, and can withstand ultra-high explosion pressure.

[0008] To achieve the above object, the application provides a high-strength power unit structure which is installed on a cylinder block of an engine and comprises a cylinder liner support seat, a cylinder liner, a cylinder head and a piston connecting rod assembly. The cylinder liner support seat is detachably fixed on the cylinder block; the cylinder liner is detachably fixed on the cylinder liner support seat; the cylinder head is detachably fixed on the cylinder liner; and the piston connecting rod assembly is installed at the bottom of the cylinder liner. A first water jacket cavity is arranged between the cylinder liner support seat and the cylinder liner, a second water jacket cavity is arranged between the cylinder liner support seat and the cylinder head, and the first water jacket cavity and the second water jacket cavity are in communication.

[0009] In an embodiment of the application, the piston connecting rod assembly comprises a piston, a piston pin, a carbon scraping ring and a connecting rod component, and the connecting rod component is composed of a connecting rod bushing, a connecting rod body, a connecting rod intermediate body and a connecting rod cover; and the piston connecting rod assembly is fixed at the bottom of the cylinder liner by bolts.

[0010] In an embodiment of the application, a first sealing groove is arranged between the cylinder liner support seat and the cylinder liner.

[0011] In an embodiment of the application, the cylinder liner support seat is integrated with a tappet chamber and a high-temperature water pipe, one end of the high-temperature water pipe is connected with an engine cooling water cavity, and the other end of the high-temperature water pipe is connected with the first water jacket cavity through a channel.

[0012] In an embodiment of the application, the channel is located at the bottom of the water jacket cavity, and the high-temperature water pipe is located lower than the channel.

[0013] In an embodiment of the application, a second sealing groove and a third sealing groove are arranged between the cylinder head and the cylinder liner support seat.

[0014] In an embodiment of the application, a cylinder gasket is installed between the cylinder head and the cylinder liner.

[0015] In an embodiment of the application, the cylinder liner support seat has a support step, and the cylinder liner is installed on the support step.

[0016] Compared with the prior art, the high-strength power unit structure according to the application has the following beneficial effects:

[0017] 1. The cylinder liner support seat is added between the cylinder head and the cylinder block, and the cylinder block water jacket is cancelled, so that the structural strength is greatly improved;

[0018] 2. The double water cavity structure is designed inside, which can provide heat dissipation for high-temperature engine parts to the greatest extent, thereby solving the reliability problem of high-explosion-pressure and high-power-density engines.

[0019] 3. The cylinder sleeve support seat integrates the tappet chamber and the high-temperature water pipe, and is connected with the engine cooling water cavity through a special channel, the mechanism is compact, and the problem of residual cooling water in the traditional structure is solved;

[0020] 4. The power unit is a whole, one cylinder, and can be flexibly arranged according to different numbers of cylinders of the engine, and is suitable for modularization and serialization development of the same platform engine;

[0021] 5. A sealing cavity is designed in the middle of the cylinder cover, the cylinder sleeve support seat and the cylinder sleeve, and is combined with the sealing of the cylinder gasket to form double protection of high-temperature gas leakage. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a schematic diagram of the overall structure of a high-strength power unit structure according to an embodiment of the present application;

[0023] Fig. 2 is a schematic diagram of the cross-sectional structure of a high-strength power unit structure according to an embodiment of the present application;

[0024] Fig. 3 is a schematic diagram of the local enlarged structure of a high-strength power unit structure according to an embodiment of the present application.

[0025] MAIN REFERENCE NUMERALS EXPLANATION

[0026] 1-cylinder cover, 11-second sealing groove, 12-second water jacket cavity, 13-third sealing groove, 2-cylinder sleeve support seat, 21-channel, 22-high-temperature water pipe, 23-tappet chamber, 24-first water jacket cavity, 3-cylinder sleeve, 31-carbon scraping ring, 32-cylinder gasket, 4-piston connecting rod assembly, 41-piston, 42-rod body, 43-rod intermediate body, 44-rod cover, 45-piston pin, 46-rod bushing, 5-cylinder head stud, 6-washer, 7-cylinder head nut, 8-cylinder body. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present application is not limited by the specific embodiments.

[0028] Unless otherwise explicitly stated, in the entire specification and claims, the term "comprise" or its variants such as "contain" or "include" and the like will be understood to include the stated element or component, but not to exclude the presence of other elements or components.

[0029] Fig. 1 is a schematic diagram of the overall structure of a high-strength power unit structure according to an embodiment of the present application; Fig. 2 is a schematic diagram of the cross-sectional structure of a high-strength power unit structure according to an embodiment of the present application; Fig. 3 is a schematic diagram of the local enlarged structure of a high-strength power unit structure according to an embodiment of the present application.

[0030] As shown in FIG. 1 to FIG. 3, according to a high-strength power unit structure of a preferred embodiment of the present application, which is installed on a cylinder block 8 of an engine, the high-strength power unit structure comprises a cylinder liner support seat 2, a cylinder liner 3, a cylinder head 1 and a piston connecting rod assembly 4. The cylinder liner support seat 2 is detachably fixed on the cylinder block 8; the cylinder liner 3 is detachably fixed on the cylinder liner support seat 2; the cylinder head 1 is detachably fixed on the cylinder liner 3; and the piston connecting rod assembly 4 is installed on the bottom of the cylinder liner 3. Among them, the cylinder liner support seat 2 and the cylinder liner 3 have a first water jacket cavity 24, the cylinder liner support seat 2 and the cylinder head 1 have a second water jacket cavity 12, and the first water jacket cavity 24 and the second water jacket cavity 12 are in communication.

[0031] In an embodiment of the present application, the piston connecting rod assembly 4 comprises a piston 41, a piston pin 45, a carbon scraping ring 31 and a connecting rod component, and the connecting rod component is composed of a connecting rod bushing 46, a connecting rod body 42, a connecting rod intermediate body 43 and a connecting rod cover 44; wherein the piston connecting rod assembly 4 is fixed on the bottom of the cylinder liner 3 by bolts.

[0032] In an embodiment of the present application, the cylinder liner support seat 2 and the cylinder liner 3 have a first sealing groove.

[0033] In an embodiment of the present application, the cylinder liner support seat 2 is integrated with a tappet chamber 23 and a high-temperature water pipe 22, one end of the high-temperature water pipe 22 is connected with an engine cooling water cavity, and the other end of the high-temperature water pipe 22 is connected with the first water jacket cavity 24 through a passage 21.

[0034] In an embodiment of the present application, the passage 21 is located at the bottom of the water jacket cavity, and the position of the high-temperature water pipe 22 is lower than that of the passage 21.

[0035] In an embodiment of the present application, the cylinder head 1 and the cylinder liner support seat 2 are provided with a second sealing groove 11 and a third sealing groove 13.

[0036] In an embodiment of the present application, the cylinder head 1 and the cylinder liner 3 are installed with a cylinder gasket 32.

[0037] In an embodiment of the present application, the cylinder liner support seat 2 has a support step, and the cylinder liner 3 is installed on the support step.

[0038] In practical application, the application provides a high-strength power unit structure, a cylinder liner support seat 2 is added between the cylinder block 8 and the cylinder cover 1, and the power unit is composed of the cylinder cover 1, the cylinder liner support seat 2, the cylinder liner 3 and the piston connecting rod assembly 4, the structure is high in strength and good in reliability, can bear super-high explosion pressure, and solves the bottleneck problem of insufficient structural strength of the traditional structure. The power unit is one cylinder, can be arranged flexibly according to different cylinder numbers of the engine, and is suitable for modularization and serialization development of the same platform engine.

[0039] Specifically, the high-strength power unit structure of the application comprises the cylinder cover 1, the cylinder liner support seat 2, the cylinder liner 3, the piston connecting rod assembly 4, the cylinder cover stud 5, the gasket 6 and the cylinder cover nut 7; the cylinder cover 1 and the cylinder liner support seat 2 are connected through bolts, and all the above-mentioned parts can be assembled into an integral body as a power unit of the engine.

[0040] The high-strength power unit structure of the application is characterized in that the cylinder liner support seat 2 is added between the cylinder cover 1 and the cylinder block 8, the cylinder liner 3 is installed on the support step of the cylinder liner support seat 2, and then the cylinder cover 1 is installed above the cylinder liner 3; the cylinder cover 1, the cylinder liner support seat 2 and the cylinder liner 3 are compressed by the cylinder cover stud 5, the gasket 6 and the cylinder cover nut 7. The piston connecting rod assembly 4 is composed of the piston 41, the piston pin 45, the carbon scraping ring 31 and the connecting rod part, wherein the connecting rod part is a three-section connecting rod composed of the connecting rod bushing 46, the connecting rod body 42, the connecting rod intermediate body 43 and the connecting rod cover 44; the piston connecting rod assembly 4 can be fixed on the bottom of the cylinder liner 3 through bolts, and together with the cylinder cover 1, the cylinder liner support seat 2 and the cylinder liner 3, forms an integral power unit.

[0041] The cylinder block 8 directly cancels the cooling water jacket, is replaced by the first water jacket cavity 24 between the cylinder liner support seat 2 and the cylinder liner 3, and the first sealing groove is designed between the cylinder liner support seat 2 and the cylinder liner 3 for sealing. The structure can maximize the structural strength of the cylinder block 8 due to the cancellation of the engine block water jacket, solves the problem of insufficient structural strength of the traditional structure; on the other hand, the cylinder liner support seat 2 is generally of an open structure, the first water jacket cavity 24 is easy to process, and the shape of the first water jacket cavity 24 can be designed into a complex shape as needed, so as to optimize the cooling effect of the high-temperature area of the cylinder liner head, and solve the problem of excessive temperature of the piston head caused by high explosion pressure.

[0042] The cylinder liner support base 2 also integrates a tappet chamber 23 and a high-temperature water pipe 22 connected to the engine's main water pipe (engine cooling water cavity), and cooling water enters the water jacket cavity through the channel 21 to cool the cylinder liner 3; the channel 21 is located at the bottom of the first water jacket cavity 24, and the high-temperature water pipe 22 is lower than the channel 21, so that after the engine stops, the cooling water flows away from the high-temperature water pipe 22, and there is no residual. Compared with the traditional structure, since the cooling water cavity is cast inside the cylinder block 8, the structure is complex, and the cooling water is inevitably left inside the cylinder block 8, which may cause the cylinder block 8 to crack if the engine works in extremely cold environment.

[0043] The second and third sealing grooves 13 between the cylinder head 1 and the cylinder liner support base 2 are sealed, and the second water jacket cavity 12 is formed therebetween, and the channel 21 is designed inside the cylinder liner support base 2 to ensure the communication between the second water jacket cavity 12 and the first water jacket cavity 24. The engine cooling water first passes through the first water jacket cavity 24 to cool the cylinder liner 3, then enters the second water jacket cavity 12 to cool the high-temperature area at the bottom of the cylinder head 1, and finally enters the inside of the cylinder head 1 to cool other components. In general, the above-mentioned double water cavity structure can maximize the heat dissipation of high-temperature components of the engine, thereby solving the reliability problem of high-explosion-pressure and high-power-density engines. The first water jacket cavity 24 and the second water jacket cavity 12 can be provided with a cleaning port or a detachable part to facilitate the removal of accumulated dirt or impurities. The inlet and outlet sizes of the first water jacket cavity 24 and the second water jacket cavity 12 are the same or different, which ensures that the cooling liquid flows at a high speed in the double water cavity, thereby helping to reduce thermal stress and improve cooling efficiency. The traditional circular flow channel may not be the most efficient choice, so the flow channel of the present application can adopt a non-circular flow channel, such as a hexagonal or other complex shape, to provide a larger force area and reduce the impact of flow on the flow channel wall, thereby reducing energy loss.

[0044] The cylinder gasket 32 is installed between the cylinder head 1 and the cylinder liner 3, which can prevent the high-temperature gas in the combustion chamber from leaking under the pressure of the cylinder head stud 5, the gasket 6 and the cylinder head nut 7; in combination with the above-mentioned two water jacket cavity structures, even if there is a slight leakage of high-temperature gas, it will not leak out of the engine after entering the cavity between the cylinder head 1, the cylinder liner support base 2 and the cylinder liner 3.

[0045] In summary, the high-strength power unit structure according to the present application has the following beneficial effects:

[0046] 1. By adding a cylinder liner support base between the cylinder head and the cylinder block, the cylinder block water jacket is cancelled, and the structural strength is greatly improved;

[0047] 2. The internal design has double water cavity structure, can provide heat dissipation for engine high temperature parts to the greatest extent, thereby solve the reliability problem brought by high explosion pressure and high power density engine;

[0048] 3. The cylinder sleeve support seat integrates the tappet chamber and high temperature water pipe, is connected with the engine cooling water cavity through special channel, the mechanism is compact, solves the problem of traditional structure cooling water residue;

[0049] 4. The power unit is a whole, one cylinder, can be flexibly arranged according to different cylinder number engine, is suitable for the modularization and serialization development of same platform engine;

[0050] 5. The middle of cylinder cover, cylinder sleeve support seat and cylinder sleeve is designed with sealing cavity, is combined with cylinder gasket sealing, forms the double protection of high temperature gas leakage

[0051] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the application. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to allow others skilled in the art to understand the application for various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the application be defined by the claims and their equivalents.

Claims

1. A high-strength power unit structure, mounted on the cylinder block of an engine, characterized in that, The high-strength power unit structure comprises: a cylinder liner support seat detachably fixed to the cylinder block; a cylinder liner detachably fixed to the cylinder liner support seat; a cylinder head detachably fixed to the cylinder liner; and a piston connecting rod assembly installed at the bottom of the cylinder liner. The first water jacket cavity is in communication with the second water jacket cavity.

2. The high-strength power unit structure of claim 1, wherein The piston connecting rod assembly comprises a piston, a piston pin, a carbon scraper ring and a connecting rod component, and the connecting rod component is composed of a connecting rod bushing, a connecting rod body, a connecting rod intermediate body and a connecting rod cover. The piston connecting rod assembly is fixed to the bottom of the cylinder liner by bolts.

3. The high-strength power unit structure of claim 1, wherein The first sealing groove is between the cylinder liner support seat and the cylinder liner.

4. The high-strength power unit structure of claim 1, wherein The cylinder liner support seat is integrated with a tappet chamber and a high-temperature water pipe, one end of the high-temperature water pipe is connected with an engine cooling water cavity, and the other end of the high-temperature water pipe is connected with the first water jacket cavity through a passage.

5. The high-strength power unit structure of claim 4, wherein The passage is located at the bottom of the water jacket cavity, and the position of the high-temperature water pipe is lower than the passage.

6. The high-strength power unit structure of claim 1, wherein The second sealing groove and the third sealing groove are between the cylinder head and the cylinder liner support seat.

7. The high-strength power unit structure of claim 1, wherein The cylinder gasket is installed between the cylinder head and the cylinder liner.

8. The high-strength power unit structure of claim 1, wherein The cylinder liner is installed on the support step of the cylinder liner support seat.

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