WO2014190633A1

WO2014190633A1 - Cooling water system for cylinder head of engine

Info

Publication number: WO2014190633A1
Application number: PCT/CN2013/083041
Authority: WO
Inventors: 马玉凤; 靳素华; 孟祥山; 胡志胜; 路明; 左淼都; 朱文军; 郑久林
Original assignee: 安徽江淮汽车股份有限公司
Priority date: 2013-05-27
Filing date: 2013-09-06
Publication date: 2014-12-04
Also published as: CN103291487B; CN103291487A; BR112015029750A2; AU2013391199A1; AU2013391199B2; RU2625894C1; CL2015003450A1

Abstract

A cooling water system for a cylinder head of an engine. A cooling water cavity is formed in a cylinder head. The cooling water cavity of the cylinder head is divided into an upper-layer water cavity and a lower-layer water cavity by a middle partition plate. Cooling water enters the lower-layer water cavity through a water inlet hole. A communicating hole is disposed between the upper-layer water cavity and the lower-layer water cavity. Lower-layer cooling water enters the upper-layer water cavity through the communicating hole. In the cooling water system for a cylinder head of an engine, the bottom of the cylinder head can be cooled by cooling liquid in the cylinder head to the greatest extent. A water filling hole of the cylinder head is disposed below an air outlet channel, and a communicating hole between the two layers of water jackets is disposed beside an air inlet channel, so that the cooling liquid enters the cylinder head from a lower side of the air outlet channel, and in the cylinder head, the cooling liquid flows through a region between the air outlet channel and the cylinder head, a region between the air outlet channels and a region between the air outlet channel the air inlet channel, and then enters the upper-layer water jacket of the cylinder head from an air inlet side, thereby fully cooling a high-temperature region around the air outlet channel.

Description

Engine cylinder head cooling water system

The invention belongs to the field of automobile engines, in particular to the field of engine cylinder heads, and specifically refers to a cooling water system of a cylinder head of an engine.

Background technique

In the design of the engine cylinder head, the intake port, the exhaust passage, the bolt boss and the injector mounting hole are arranged on the cylinder head. And an outer surface of the air inlet, the exhaust passage, the bolt boss and the injector mounting hole form a cavity with the inner surface of the cylinder head, and cooling water flows in the cavity to cool the cylinder head and the corresponding portion, The water inlet hole of the cylinder head is distributed around the cylinder block of the lower bottom surface of the cylinder head. According to actual needs, the area most in need of enhanced cooling in the cylinder head is the lower bottom surface of the cylinder head, the nose bridge area near the mounting hole where the injector is installed, and the area near the exhaust passage.

There are two kinds of cavities for flowing cooling water in the cylinder head of the prior art, one is a single-layer water chamber structure, and the other is a double-layer water chamber structure. In the single-layer water chamber structure, after the cooling water enters the cylinder head from the inlet hole, the direction of the water flow directly impacts the top of the cylinder head, and a hole zone is easily generated at the bottom of the cylinder head, and the bottom surface of the cylinder head is the most The area where cooling is required is required, and therefore, the cooling water system of the single-layer water chamber structure has a limited space for improving the cooling effect of the cylinder head.

The double-layer water chamber structure has been widely used. Especially with the increase of environmental problems, the requirements for engine exhaust emissions are becoming more and more strict. In order to meet the strict emission requirements, the engine is strengthened. The cylinder head is a thin-walled casting component, and its rigidity and strength are relatively weak. Moreover, due to the requirements of the process, the cylinder head is generally divided into two layers by the air passage to manufacture the membrane, and two layers are cast during casting. The water chamber sand cores are bonded together, so that the inevitable flash edges are formed in the middle of the two water chambers, which increases the scrap rate.

In the cylinder head structure of the two-layer water chamber structure, the cooling water generally adopts a cooling water passage, and the cooling water from the inlet hole passes through the cooling water passage simultaneously into the upper water chamber and the lower water chamber, so as to be expected to improve the cylinder. The cooling effect of the cover. However, this structure increases the passage of the cooling water into the upper water chamber, which is not to increase the volume of the cylinder head, or to reduce the volume of the water chamber in the cylinder head, and has little effect on the actual cooling effect. Chinese Patent Application No. CN200810235221. 1 describes a high-strength cylinder head having a double-layer water flow passage, the main technical scheme of which is: the upper bottom plate and the lower bottom plate form a cylinder head, and the injector cover is provided with a fuel injector mounting hole. An air passage is arranged around the injector mounting hole, a water inlet hole is arranged on the bottom plate of the cylinder head, a water outlet hole is arranged on the upper top plate, a cooling water chamber is arranged in the cylinder head, and a middle partition plate is arranged in the cylinder head to divide the cooling water. The cavity is an upper water chamber and a lower water chamber, and an upper connecting water chamber and a lower connecting water chamber are respectively opened between the injector mounting hole and the air passage; and a reinforcing partition is arranged between the upper connecting water chamber and the lower connecting water chamber A communicating hole for connecting the upper connecting water chamber and the lower connecting water chamber is formed on the reinforcing partition, and the water inlet hole communicates with the lower water chamber, and the water outlet hole communicates with the upper water chamber. Although the technical scheme improves the cooling effect, there are still deficiencies, mainly in that the connecting hole connecting the water chamber and the lower connecting water chamber interferes with the flow path of the cooling water, and the portion of the cylinder head away from the water outlet hole There is a certain infinite loop, which leads to poor cooling.

The cooling of the gas red cap not only has the contradiction between the bottom and the top, but also the cooling requirements for the intake side and the exhaust side. Because of the high temperature gas that is in contact with the bottom of the cylinder head, the exhaust gas flowing in the exhaust passage has a further heating effect on the exhaust side, so reducing the heat load on the exhaust side is also the key to improving the reliability of the cylinder head. Summary of the invention

The present invention provides a water chamber for an engine cylinder head that changes the flow field of the coolant to improve the cooling performance of the cylinder head and the service life of the cylinder head.

Another object of the present invention is to provide an engine cylinder head having the above water chamber.

The invention is achieved by the following technical solutions:

An engine cylinder head cooling water system includes an integrally formed at least four-cylinder engine cylinder head, an injector mounting hole is disposed on the cylinder head, and two intake ports and two are distributed around the injector mounting hole The exhaust passage forms a cylinder head cooling water chamber inside the cylinder head and the outer surface of the intake passage, the outer surface of the exhaust passage and the outer surface of the injector mounting hole, and the cylinder cover cooling water chamber is divided into upper layers by the intermediate partition a water chamber and a lower water chamber; a water outlet hole is arranged at one end of the upper water chamber, and a water inlet hole is arranged along the bottom of the cylinder head under the cylinder head of the lower water chamber, and the cooling water enters the lower water chamber through the water inlet hole; A communication hole is arranged between the upper water chamber and the lower water chamber, and the lower layer of cooling water enters the upper water chamber through the communication hole;

The upper water chamber is made up of the upper water chamber between the inner wall of the cylinder head and the outer surface of the inlet passage and the upper surface of the exhaust passage. The cavity is formed by an upper connecting water chamber of the upper nasal bridge region;

The lower water chamber is composed of a lower water chamber between the inner wall of the cylinder head and the outer surface of the inlet passage and the upper surface of the exhaust passage, and a lower connecting water chamber of the lower nasal bridge region;

The communication holes are connected to the upper water chamber and the lower water chamber.

The second cylinder head and the third cylinder head further comprise inclined communication holes respectively connecting the lower connecting water chamber of the first cylinder head near the second cylinder head side and the upper water chamber of the second cylinder head and connecting the second cylinder head The lower water chamber on the third cylinder head side and the upper water chamber of the third cylinder head.

The communication hole is disposed outside the intake passage away from the injector mounting hole.

An auxiliary water hole is provided on the exhaust side.

Two upper connecting water chambers and a lower connecting water chamber are disposed on each side of each inlet or exhaust passage. Forming at least four cooling water flow paths in the lower water chamber, respectively,

The first cooling water flow path, the cooling water flowing in from the water inlet hole enters the lower water chamber, is guided into the lower nose bridge region near the injector mounting hole through the lower connecting water chamber, and is connected to the lower water chamber through the lower side adjacent to the adjacent cylinder head Entering the lower water chamber flow path of the adjacent cylinder head;

The second cooling water flow path, the cooling water entering the lower water chamber flows along the inner wall of the cylinder head and the lower bottom surface of the cylinder head, and then flows to the communication hole to enter the upper water chamber;

The third cooling water flow path enters the lower water chamber from the cooling water flowing into the water inlet hole, and flows from the cooling water in the lower water chamber to the lower water chamber flow path of the adjacent cylinder head.

The fourth cooling water flow path, the cooling water flowing in from the water inlet hole enters the lower water chamber, is guided into the lower nose bridge region near the injector mounting hole by the lower connecting water chamber, and is connected to the lower water chamber through the lower side adjacent to the adjacent cylinder head And enter the upper water chamber through the oblique communication hole.

At least two cooling water flow paths are formed in the upper water chamber, respectively,

The fifth cooling water flow path enters the upper water chamber from the cooling water of the communication hole, enters the upper nasal bridge area through the upper connecting water chamber, and then flows to the upper water chamber flow path of the adjacent cylinder head and collects into the water outlet hole;

The sixth cooling water flow path enters the upper water chamber from the cooling water of the communication hole, flows through the inner wall of the cylinder head and the outer surface of the air inlet or the outer surface of the exhaust passage, and then flows to the upper water chamber flow path of the adjacent cylinder head and is collected to the water outlet hole. .

The water inlet hole includes a main water inlet hole and an auxiliary water inlet hole, and the main water inlet hole and the auxiliary water inlet hole are all set On the lower side of the exhaust passage, the area of the auxiliary outlet hole is gradually increased from the cylinder head away from the water outlet hole to the cylinder head on the outlet hole side.

The beneficial effects of the present invention over the prior art are:

The cooling of the gas red cap not only has the contradiction between the bottom and the top, but also the cooling requirements for the intake side and the exhaust side. Since there is contact with high-temperature gas at the bottom of the cylinder head, the exhaust gas flowing in the exhaust passage has a further heating effect on the exhaust side, so reducing the heat load on the exhaust side is also the key to improving the reliability of the cylinder head. The invention provides a double-layer water chamber cylinder head, which can cool the bottom of the cylinder head as much as possible in the cylinder head; and the upper water hole of the cylinder head is designed under the exhaust passage, and the connection between the two water chambers The hole is designed on the inlet side, so that the coolant can enter the cylinder head from below the exhaust passage, and flow through the area between the exhaust passage and the gas red cover, the area between the exhaust passage and the exhaust passage in the gas red cover, and The area between the exhaust passage and the intake passage enters the upper water chamber of the cylinder head from the intake side, and a part of the coolant flows into the adjacent cylinder head. This design can sufficiently cool the high temperature area around the exhaust passage. Instruction sheet

Figure 1 is a schematic cross-sectional view showing the cylinder head of the present invention;

Figure 2 is a cross-sectional view of the communication hole of the present invention;

Figure 3 is a plan view of the upper water chamber of the cylinder head of the present invention;

Figure 4 is a plan view of the lower water chamber of the cylinder head of the present invention. The embodiments of the present invention are merely illustrative and are not to be construed as limiting the technical solutions of the present invention.

As shown in FIG. 1 to FIG. 4, an engine cylinder head cooling water system mainly refers to a cylinder head of a four-cylinder engine, which is a first cylinder head to a fourth cylinder head in turn, and is disposed at a center position of each cylinder head. There is an injector mounting hole 3, and there are two inlet ports and two exhaust passages 4 in a diamond shape around the injector mounting hole 3. The hollow structure and the outer surface of the inlet port and the row inside the cylinder head are arranged. The outer surface of the air passage and the outer surface of the injector mounting hole form a cylinder head cooling water chamber, and the cylinder head cooling water chamber is divided into an upper water chamber 1 and a lower water chamber 2 by an intermediate partition; a fourth cylinder at one end of the upper water chamber The cover side is provided with a water outlet, on the lower layer The bottom surface of the cylinder head of the water chamber is arranged along the cylinder body to set the water inlet hole, and the cooling water passing through the water channel of the outer layer of the cylinder enters the lower water chamber through the water inlet hole; the communication hole is arranged between the upper water chamber and the lower water chamber The lower layer of cooling water enters the upper water chamber through the communication hole; the communication hole is disposed outside the inlet port away from the injector mounting hole, where the outside of the inlet port is referred to, and the communication hole is disposed in the inlet port and the exhaust port. The upper circular water chamber of the diamond is surrounded by the upper wall of the cylinder head and the upper surface of the inlet and the upper surface of the exhaust passage.

a region and an upper connecting water chamber connecting the upper water chamber and the upper nasal bridge region;

The lower water chamber is made up of the inner wall of the cylinder head and the lower water chamber between the outer surface of the inlet and the upper surface of the exhaust passage.

The nasal bridge region and the lower connected water chamber connecting the lower water chamber and the lower nasal bridge region are composed. The communication holes are connected to the upper water chamber and the lower water chamber.

An auxiliary communication hole is provided on the exhaust side. The auxiliary communication hole is provided on the exhaust side of the fourth cylinder head.

There are two upper connecting water chambers and a lower connecting water chamber on each side of each inlet or exhaust passage, that is, between the exhaust passage and the exhaust passage, and between the exhaust passage and the intake passage. Connect the water chamber and the lower connection water chamber.

The cooling water flowing between the upper connecting water chamber and the lower connecting water chamber formed by the first cylinder head and the exhaust passage and the inlet port on the side adjacent to the second cylinder head is from the first cylinder head to the second cylinder head; The cooling water flowing between the upper cylinder and the lower connecting water chamber formed by the exhaust port and the inlet port of the second cylinder head adjacent to the third cylinder head flows from the second cylinder head to the third cylinder head; in the third cylinder The cooling water flowing between the upper connecting water chamber and the lower connecting water chamber formed on the adjacent side of the fourth cylinder head and the intake passage is from the third cylinder head to the fourth cylinder head; the fourth cylinder head is adjacent to the water outlet The cooling water flowing between the upper connecting water chamber and the lower connecting water chamber formed by the intake passage and the exhaust passage on the side of the hole flows toward the fourth cylinder head toward the water outlet hole. In addition, the cooling water flow path in the cylinder head also includes:

Forming at least four cooling water flow paths in the lower water chamber, respectively,

The first cooling water flow path, the cooling water flowing in from the water inlet hole enters the lower water chamber, is guided through the lower connecting water chamber, enters the lower nose bridge region near the injector mounting hole, and passes through the lower connecting water adjacent to the adjacent cylinder head The cavity enters the lower water chamber flow path of the adjacent cylinder head;

The water inlet hole includes a main water inlet hole and an auxiliary water inlet hole, and the main water inlet hole and the auxiliary water inlet hole are disposed on the lower side of the exhaust passage, wherein the auxiliary water outlet hole is from the first cylinder head to the fourth cylinder head cover. The area is gradually increasing. The purpose of this design is to gradually reduce the flow rate and pressure of the cooling water by increasing the area of the inlet hole on the water outlet side, which is advantageous for the distant cooling water to be collected at the outlet hole without obstruction.

Embodiment 1

In the following embodiments, only the technical description of the water chamber and the cooling water flow direction in the cylinder head will be described, and the structure of each part on the cylinder head will not be described in detail. In the present embodiment, the outside of the intake side 7 on each cylinder head is provided with a communication hole for supplying cooling water into the upper water chamber. In other embodiments, the communication hole may also be disposed on the exhaust side 6, but not The optimal choice of the invention.

The water flow control inside the cylinder head of the invention adopts double-layer control, and the water chamber of the cylinder head is composed of an upper water chamber and a lower water chamber, and a partition is arranged between the upper water chamber and the lower water chamber, and the upper water chamber and the lower water chamber respectively flow without mutual interference. The lower water chamber is controlled in a limited space, and the water flow speed is easy to ensure, which can strengthen the cooling of the cylinder head bottom plate; this is beneficial to the realization of the cylinder head water flow control, reducing the heat load of the cylinder head and improving the life of the cylinder head; At the same time, the partition can increase the rigidity of the cylinder head and increase the mechanical load strength of the cylinder head; the main upper water hole on the exhaust side of the cylinder head and the communication hole 5 of the two water chambers can make all the inlet side The cooling water flows through the area around the exhaust passage after entering the cylinder head. The water flow first passes through the area between the exhaust passage and the exhaust passage, and the area between the exhaust passage and the cylinder head. This design first ensures the cylinder head. The cooling of the area with the largest heat load; secondly, the area between the inlet and the exhaust is also the area where intensive cooling is required, so that the water flows out through the area between the exhaust and the exhaust, and then flows through the two. The area between the exhaust passage and the intake passage on the side, the area between the intake passage and the intake passage; the upper water chamber 1 and the lower water chamber 2 communicate on the intake side, that is, the upper water chamber and the lower water chamber The communication hole 5 is connected, and then the water flow uniformly flows to the main communication hole 5 to enter the upper water chamber of the cylinder head, and the water flow flows to the main communication hole 5 of the water chamber of the adjacent cylinder, respectively. The water entering the cylinder head from the auxiliary water inlet hole below the exhaust passage flows through the area connected between the two cylinders, and then flows to the main communication hole 5 nearest thereto to enter the upper water chamber 2 of the cylinder head. The auxiliary water hole from one cylinder to four cylinders gradually increases. Embodiment 2

The water flow control inside the cylinder head of the invention adopts double-layer control, and the cylinder head water chamber is composed of an upper water chamber 1 and a lower water chamber 2, and a partition between the upper water chamber 1 and the lower water chamber 2, the upper water chamber 1 and the lower water chamber 2 The flow does not interfere with each other separately; the lower water chamber 2 is controlled in a limited space, and the water flow speed is easily ensured, which can strengthen the cooling of the cylinder head bottom plate; this is beneficial to the realization of the cylinder head water flow control, and reduces the heat of the cylinder head cover. Load, improve the life of the cylinder head; at the same time, the partition can increase the rigidity of the cylinder head and increase the mechanical load strength of the cylinder head; the main inlet hole on the exhaust side of the cylinder head, the communication hole 5 of the two-layer water chamber can make all on the intake side The cooling water flows through the area around the exhaust passage after entering the cylinder head, and an auxiliary communication hole is added to the exhaust side.

The second cylinder head and the third cylinder head further comprise inclined communication holes respectively connecting the lower connecting water chamber of the first cylinder head near the second cylinder head side and the upper water chamber of the second cylinder head and connecting the second cylinder head The lower water chamber on the third cylinder head side and the upper water chamber of the third cylinder head. The water flow first passes through the area between the exhaust passage and the exhaust passage, and the area between the exhaust passage and the cylinder head. This design first ensures the cooling of the area where the thermal load of the cylinder head is the largest; secondly, the intake passage and the exhaust passage. The area between them is also an area where intensive cooling is required, so that the water flows out through the area between the exhaust duct and the exhaust duct, and then flows up through the area between the exhaust duct and the intake duct on both sides, the intake port. The area between the upper water chamber and the lower water chamber 2 is connected to the intake side, that is, the connection hole between the upper water chamber and the lower water chamber, and then the water flow uniformly flows to the main communication hole 5 to enter the upper water of the cylinder head. The water flows to the main communication hole 5 of the water chamber of the adjacent cylinder, respectively. The water entering the cylinder head from the auxiliary upper water hole below the exhaust passage flows through the area connected between the two cylinders, and then flows to The nearest main communication hole 5 thus enters the upper water chamber 2 of the cylinder head. The auxiliary water hole from one cylinder to four cylinders gradually increases.

In this embodiment, the second cylinder head and the third cylinder head further include oblique communication holes respectively connected to the lower connecting water chamber of the first cylinder head near the second cylinder head side and the upper water chamber of the second cylinder head and Connecting the second cylinder head to the lower connecting water chamber on the third cylinder head side and the upper water chamber of the third cylinder head. Through the design of the structure, a cooling water flow path appears in the cylinder head, and the cooling water flowing in from the water inlet hole enters the lower water chamber, and is guided through the lower connecting water chamber into the lower nose bridge region near the injector mounting hole, through The lower water chamber adjacent to the adjacent cylinder head is connected to the upper water chamber through the oblique communication hole.

While the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art The scope of the invention is defined by the appended claims and their equivalents.

Claims

Rights request

1. An engine cylinder head cooling water system, including an integrally formed at least four-cylinder engine cylinder head. The cylinder head is provided with a fuel injector mounting hole, and two air inlets are distributed around the fuel injector mounting hole. and two exhaust ducts, forming a cylinder head cooling water chamber inside the cylinder head and on the outer surfaces of the intake duct, the outer surface of the exhaust duct and the outer surface of the injector mounting hole, which is characterized by: cylinder head cooling water chamber It is divided into an upper water chamber and a lower water chamber by a middle partition; a water outlet hole is provided at one end of the upper water chamber, and water inlet holes are evenly distributed along the cylinder body on the bottom surface of the cylinder head of the lower water chamber, and cooling water passes through the water inlet hole. Entering the lower water chamber; a connecting hole is provided between the upper water chamber and the lower water chamber, and the lower cooling water enters the upper water chamber through the connecting hole;

The upper water chamber is composed of the upper water chamber between the inner wall of the cylinder head and the outer surface of the intake duct and the upper surface of the exhaust duct, the spray chamber and the upper connecting water chamber in the upper nose bridge area;

The lower water chamber is composed of the lower water chamber between the inner wall of the cylinder head and the outer surface of the intake duct and the upper surface of the exhaust duct, the spray chamber and the lower connection water chamber in the lower nose bridge area;

The communication hole connects the upper water chamber and the lower water chamber.

2. The engine cylinder head cooling water system according to claim 1, characterized in that: the communication hole is provided outside the intake duct in a direction away from the injector mounting hole.

3. The engine cylinder head cooling water system according to claim 1, characterized in that: the second cylinder head and the third cylinder head further include oblique communication holes, respectively connected to the side of the first cylinder head near the second cylinder head. The lower connecting water chamber and the upper water chamber of the second cylinder head are connected, and the lower connecting water chamber of the second cylinder head near the third cylinder head side and the upper water chamber of the third cylinder head are connected.

4. The engine cylinder head cooling water system according to claim 1, characterized in that: an auxiliary water supply hole is provided on the exhaust port side.

5. The engine cylinder head cooling water system according to claim 1, characterized in that: two upper connecting water chambers and a lower connecting water chamber are provided on both sides of each intake passage or exhaust passage.

6. The engine cylinder head cooling water system according to claim 1, characterized in that: at least four cooling water channels are formed in the lower water chamber, respectively, In the first cooling water path, the cooling water flowing in from the water inlet enters the lower water chamber, is guided by the lower connecting water chamber, enters the lower nose bridge area near the injector mounting hole, and passes through the lower connecting water chamber on the side adjacent to the adjacent cylinder head. Enter the lower water cavity flow path of the adjacent cylinder head;

In the second cooling water path, the cooling water entering the lower water chamber flows along the inner wall of the cylinder head and the lower bottom surface of the cylinder head and then flows to the connecting hole and enters the upper water chamber;

In the third cooling water path, the cooling water flowing in from the water inlet hole enters the lower water chamber, and the cooling water from the lower water chamber flows to the lower water chamber flow path of the adjacent cylinder head.

The fourth cooling water path, the cooling water flowing in from the water inlet enters the lower water chamber, is guided by the lower connecting water chamber, enters the lower nose bridge area near the injector mounting hole, and passes through the lower connecting water chamber on the side adjacent to the adjacent cylinder head. And enters the upper water chamber through the oblique communication hole.

7. The engine cylinder head cooling water system according to claim 1, characterized in that: at least two cooling water paths are formed in the upper water chamber, respectively,

In the fifth cooling water path, the cooling water from the connecting hole enters the upper water chamber, enters the upper nose bridge area through the upper connecting water chamber, and then flows to the upper water chamber flow path of the adjacent cylinder head and converges to the water outlet hole;

The sixth cooling water path, the cooling water from the connecting hole enters the upper water chamber, flows through the inner wall of the cylinder head and the outer surface of the intake port or the outer surface of the exhaust port, then flows to the upper water chamber flow path of the adjacent cylinder head and collects at the outlet hole .

8. The engine cylinder head cooling water system according to claim 1, characterized in that: the water inlet hole includes a main water inlet hole and an auxiliary water inlet hole, and the main water inlet hole and the auxiliary water inlet hole are both arranged in the drain. On the lower side of the air passage, the area of the auxiliary water outlet gradually increases from the cylinder head away from the water outlet to the cylinder head on the side of the water outlet.