WO2022027875A1

WO2022027875A1 - Composite engine

Info

Publication number: WO2022027875A1
Application number: PCT/CN2020/131921
Authority: WO
Inventors: 王鹏程; 兰棠洁; 向本杰
Original assignee: 广西玉柴机器股份有限公司
Priority date: 2020-08-03
Filing date: 2020-11-26
Publication date: 2022-02-10
Also published as: CN111749808A

Abstract

A composite engine, comprising an air cylinder block assembly (7), a crankcase (8), a main bearing cap (6) and a main bearing cap bolt (5). The air cylinder block assembly (7) integrates an air cylinder head and an air cylinder liner. One end of the main bearing cap bolt (5) penetrates the main bearing cap (6) and the crankcase (8), and is screwed below the air cylinder block assembly (7). A machined cut structure or an expansion end structure is used between the main bearing cap (6) and the crankcase (8). The composite engine can meet the design requirements for engines of different displacements, thereby achieving engine development serialization and parts universalization.

Description

combined engine

technical field

The present invention relates to the technical field of internal combustion engines, in particular to a combined engine.

Background technique

The traditional internal combustion engine structure consists of cylinder head 2, cylinder head gasket 3, cylinder liner, cylinder block 4, crankcase, main bearing cap 6 and main bearing cap bolts 5, etc. The cylinder liner is divided into dry type cylinder liner and wet type cylinder liner, which are usually installed into the cylinder block 4 by clearance fit or transition fit. The cylinder block 4 and the cylinder head 2 are fastened with cylinder head bolts 1, and sealed by the cylinder head gasket 3, as shown in Fig. 1 for details.

In the prior art solution, the cooperation between the cylinder liner and the cylinder block requires special design and a special press-fitting process, the cost of parts is high, and the assembly is difficult. When the cylinder liner is not assembled correctly, it is easy to cause the deformation of the cylinder liner, resulting in pulling the cylinder and thus scrapping the engine.

In the prior art solution, there is a flow of lubricating oil and coolant between the cylinder block and the cylinder head, which is sealed by the cylinder head gasket, and the cylinder head gasket is easily damaged under the action of alternating thermal stress and mechanical stress, causing air leakage , water leakage, oil leakage and other faults. Cylinder head bolts are prone to fatigue under mechanical stress, which will also lead to failures such as cylinder head gasket seal failure.

In the prior art solution, engines with different displacements need to design different important parts such as cylinder heads, cylinder blocks, cylinder liners, cylinder head gaskets, etc. The parts universality between engines with different displacements are poor, the cost is high, and it is not conducive to serialization development.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a combined engine, which can meet the design requirements of engines with different displacements, and realize the serialization of engine development and the generalization of components.

To achieve the above object, the present invention provides a combined engine comprising: a cylinder block assembly, a crankcase, a main bearing cover, and a main bearing cover bolt. The cylinder block assembly integrates the cylinder head and cylinder liner. One end of the main bearing cap bolt penetrates the main bearing cap and the crankcase and is screwed under the cylinder block assembly. Among them, a machining notch structure or an expanded end structure is adopted between the main bearing cover and the crankcase.

In one embodiment of the present invention, the cylinder block assembly omits cylinder head gaskets and cylinder head bolts.

In one embodiment of the present invention, the cylinder block assembly is integrally formed by casting.

In an embodiment of the present invention, the material of the cylinder block assembly is steel.

In an embodiment of the present invention, the cylinder block assembly has a coolant oil passage and a lubricating oil passage, the coolant circulates inside the cylinder block assembly through the coolant oil passage, and the lubricating oil passes through the lubricating oil passage in the cylinder block assembly Internal circulation.

Compared with the prior art, the combined engine according to the present invention can meet engine design requirements of different displacements through the combination of a limited number of cylinder blocks and crankcases, and realize serialization of engine development and universalization of components. The cylinder liner structure is canceled, and it is integrated with the cylinder block, thereby simplifying the design and assembly of the cylinder liner and the cylinder block. Moreover, the cylinder head and the cylinder block are integrated and designed as a whole, and the cylinder head gasket and the cylinder head bolt are eliminated, thereby avoiding the failure caused by the bolt and the cylinder head gasket.

Description of drawings

Fig. 1 is the structural representation of existing traditional internal combustion engine;

FIG. 2 is a schematic structural diagram of a combined engine according to an embodiment of the present invention.

3 is a schematic structural diagram of a cylinder block assembly of a combined engine according to an embodiment of the present invention.

4 is a schematic structural diagram of a crankcase and a main bearing cover of a combined engine according to an embodiment of the present invention.

Description of main reference signs:

1- Cylinder head bolts, 2- Cylinder head, 3- Cylinder head gasket, 4- Cylinder block, 5- Main bearing cap bolts, 6- Main bearing cap, 7- Cylinder block assembly, 71- Cylinder liner, 8- Crankshaft box.

detailed description

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

Unless expressly stated otherwise, throughout the specification and claims, the term "comprising" or its conjugations such as "comprising" or "comprising" and the like will be understood to include the stated elements or components, and Other elements or other components are not excluded.

FIG. 2 is a schematic structural diagram of a combined engine according to an embodiment of the present invention. 3 is a schematic structural diagram of a cylinder block assembly of a combined engine according to an embodiment of the present invention. 4 is a schematic structural diagram of a crankcase and a main bearing cover of a combined engine according to an embodiment of the present invention.

As shown in FIGS. 2 to 4 , a combined engine according to a preferred embodiment of the present invention includes: a cylinder block assembly 7 , a crankcase 8 , a main bearing cap 6 and main bearing cap bolts 5 . The cylinder block assembly 7 integrates a cylinder head and cylinder liner 71 . One end of the main bearing cap bolt 5 penetrates the main bearing cap 6 and the crankcase 8 and is screwed under the cylinder block assembly 7 . Among them, a machining notch structure or an expanded end structure is adopted between the main bearing cover 6 and the crankcase 8 .

In one embodiment of the present invention, the cylinder block assembly 7 omits cylinder head gaskets and cylinder head bolts. The cylinder block assembly 7 is integrally formed by casting. The material of the cylinder block assembly 7 is steel. The cylinder block assembly 7 has a coolant oil passage and a lubricating oil passage. The coolant circulates in the cylinder block assembly 7 through the coolant oil passage, and the lubricating oil circulates in the cylinder block assembly 7 through the lubricating oil passage.

In practical application, the combined engine of the present invention is composed of a cylinder block assembly 7 , a crankcase 8 , a main bearing cap 6 , and a main bearing cap bolt 5 . The cylinder block assembly 7 of the present invention integrates the cylinder head and the cylinder liner 71, and eliminates the cylinder head gasket. The realization method is to design the part of the cylinder block that cooperates with the cylinder liner 71 and the cylinder head as a cast integral body, and the cooling liquid and lubricating oil directly circulate in it, and the sealing of the cylinder head gasket is not required. The invention has no cylinder liner structure, the cylinder hole is directly processed in the cylinder block, and the piston works directly in the cylinder hole. And the crankcase 8 and the main bearing cover 6 are fixed on the cylinder block by the main bearing cover bolts 5 . If necessary, some auxiliary bolts can be added for fixing. The main bearing cap bolts 5 pass through the crankcase 8 and the main bearing cap 6, and the crankcase 8 and the main bearing cap 6 can adopt structures such as machining incisions and expansion ends. The present invention can design two or more cylinder block assemblies 7 and crankcase assemblies (crankcase 8 and main bearing cap 6) with different sizes, such as cylinder block assembly A, cylinder block assembly B, and cylinder block assembly C. At the same time, crankcase assembly E, crankcase assembly F, and crankcase assembly G with different sizes are designed. A/B/C and E/F/G can be combined arbitrarily, and engine bodies with different displacements can be designed.

In a word, the combined engine of the present invention can meet the design requirements of engines with different displacements through the combination of a limited number of cylinder blocks and crankcases, and realize serialization of engine development and universalization of components. The cylinder liner structure is canceled, and it is integrated with the cylinder block, thereby simplifying the design and assembly of the cylinder liner and the cylinder block. Moreover, the cylinder head and the cylinder block are integrated and designed as a whole, and the cylinder head gasket and the cylinder head bolt are eliminated, thereby avoiding the failure caused by the bolt and the cylinder head gasket.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise form disclosed, and obviously many changes and modifications are possible in light of the above teachings. The exemplary embodiments were chosen and described for the purpose of explaining certain principles of the invention and their practical application, to thereby enable one skilled in the art to make and utilize various exemplary embodiments and various different aspects of the invention. Choose and change. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

A combined engine is characterized in that, comprising:

Cylinder block assembly with integrated cylinder head and cylinder liner;

Crankcase;

main bearing caps; and

a main bearing cap bolt, one end of the main bearing cap bolt penetrates the main bearing cap and the crankcase and is screwed under the cylinder block assembly;

Wherein, a machining notch structure or an expanded end structure is adopted between the main bearing cover and the crankcase.
The combined engine of claim 1, wherein the cylinder block assembly omits cylinder head gaskets and cylinder head bolts.
The combined engine of claim 1, wherein the cylinder block assembly is integrally formed by casting.
The combined engine of claim 1, wherein the cylinder block assembly is made of steel.
The combined engine of claim 1, wherein the cylinder block assembly has a coolant oil passage and a lubricating oil passage, and the coolant circulates inside the cylinder block assembly through the coolant oil passage, And the lubricating oil circulates inside the cylinder block assembly through the lubricating oil passage.