Efficient engine cooling water jacket

Abstract

The efficient engine cooling water jacket comprises a cylinder body water jacket, a main water inlet is formed in the air inlet side of the front end of the cylinder body water jacket, a plurality of water outlets are formed in the exhaust side of the front end of the cylinder body water jacket, a flow limiting device is arranged at the rear end of the cylinder body water jacket, and a V-shaped inter-cylinder hole is formed between every two adjacent cylinders; the cylinder gasket water hole is used for connecting the cylinder body water jacket and the cylinder cover water jacket; the cylinder cover water jacket comprises an upper-layer water jacket and a lower-layer water jacket, the cylinder cover water jacket is integrated with an exhaust manifold, the upper-layer water jacket and the lower-layer water jacket are connected through at least three communication points, a main water outlet is formed in the rear end of the exhaust side of the cylinder cover water jacket, and cooling liquid enters from the main water inlet of the cylinder body water jacket, enters the cylinder cover water jacket through a cylinder gasket water hole and then is divided into a plurality of branches to flow; comprising mixed flow of transverse flow and longitudinal flow, and finally flows out through the main water outlet. The engine can be quickly warmed up, the oil consumption is reduced, and the cooling liquid can reduce the thermal load of the exhaust manifold during high load; the key area heat effect is reduced, and the knocking risk is reduced; and the heat exchange of the integrated exhaust manifold area is better.

Description

Technical Field

[0001] The present invention relates to the technical field of engine cooling, and particularly relates to an efficient engine cooling water jacket. Background Art

[0002] With the continuous improvement of the requirements for engine power and economy, small-sized enhanced engines with technologies such as high compression ratio, high supercharging, and small displacement have gradually become the mainstream. However, the improvement of the engine enhancement level has led to an increase in the thermal load of the cylinder head. Due to the simple design of the traditional longitudinal water jacket structure, the inlet and outlet of the water jacket are respectively arranged at the front and rear ends of the engine, and the flow form of the coolant is single, making it difficult to achieve uniform distribution of the coolant and uniformity of heat exchange, especially difficult to meet the cooling requirements of the nose area of the cylinder head.

[0003] Currently, the mainstream engine water jacket solution is: arranging the inlet and outlet at the exhaust side of the cylinder block water jacket, with the coolant flowing longitudinally in the cylinder block and flowing through the gasket water holes to the cylinder head, and the flow in the cylinder head is cross-flow. The cylinder head is usually designed with two or three layers of water jackets and integrated exhaust manifolds, and the coolant finally flows back to the cylinder block from the cylinder head.

[0004] The above water jacket solution has the following two main disadvantages: the cross-flow design in the cylinder head results in poor heat exchange effect in the nose area of the intake and exhaust valves; the main outlet hole is located in the cylinder block, and the required water volume of the outlet hole on the cylinder head is small, making it impossible to build a good pressure difference in the integrated exhaust manifold area, resulting in poor coolant flow effect.

[0005] In view of this, there is an urgent need for an efficient engine cooling water jacket that can meet the requirements. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an efficient engine cooling water jacket, which realizes rapid warm-up and reduces fuel consumption through an integrated exhaust manifold, and effectively reduces the thermal load of the exhaust manifold under high load. At the same time, a mixed flow mode combining cross-flow and longitudinal flow is adopted to make the cooling of each cylinder of the engine more uniform, reduce the thermal effect in key areas, and reduce the risk of knocking. In addition, the main outlet is arranged on the cylinder head, and the upper and lower water jackets are connected by drilling, significantly improving the heat exchange effect in the integrated exhaust manifold area.

[0007] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0008] An efficient engine cooling water jacket, comprising:

[0009] A cylinder block water jacket, with a main inlet arranged on the front intake side, an EGR outlet, an oil cooler outlet, and a supercharger outlet arranged on the exhaust side. A flow limiting device for restricting the coolant flow is provided at the rear end of the cylinder block water jacket, and a V-shaped inter-cylinder hole is provided between adjacent cylinders;

[0010] The cylinder gasket water hole is used to connect the cylinder block water jacket and the cylinder head water jacket. The cylinder gasket water hole includes an exhaust side cylinder gasket water hole located on the exhaust side of the cylinder block water jacket and an intake side cylinder gasket water hole located on the intake side of the cylinder block water jacket;

[0011] The cylinder head water jacket includes an upper water jacket and a lower water jacket. The cylinder head water jacket integrates an exhaust manifold. The upper water jacket and the lower water jacket are connected by at least three connection points. A main water outlet is provided at the rear end of the exhaust side of the cylinder head water jacket. The coolant enters from the main water inlet of the cylinder block water jacket, enters the cylinder head water jacket through the cylinder gasket water hole, and then flows in multiple branches, including a mixed flow of cross-flow and longitudinal flow, and finally flows out through the main water outlet.

[0012] Preferably, in the above technical solution, the connection points include: the gap between the bowl-shaped plug at the front end of the exhaust flange and the upper and lower water jackets, the water replenishing groove between the bowl-shaped plug at the rear end of the exhaust flange and the upper and lower water jackets, the water holes between adjacent cylinders and at the front end of cylinder 1 and the rear end of cylinder 4.

[0013] Preferably, in the above technical solution, the number of the water holes is five, and the diameters of the five water holes are the same or different. The specific positions are: at the front end of cylinder 1, between cylinder 1 and cylinder 2, between cylinder 2 and cylinder 3, between cylinder 3 and cylinder 4, and at the rear end of cylinder 4.

[0014] Preferably, in the above technical solution, the lower water jacket is used to cool the combustion chamber area, including the spark plug area, the intake valve area, and the exhaust valve area. The intake valve area includes the intake valve nose area, the exhaust valve area includes the exhaust valve nose area, and an intake and exhaust valve nose area for transition is arranged between the intake valve nose area and the exhaust valve nose area. The flow path of the coolant in the combustion chamber area passes through the intake valve nose area, the intake and exhaust valve nose area, and the exhaust valve nose area to achieve uniform cooling.

[0015] Preferably, in the above technical solution, the water inlet area of the exhaust valve nose area is larger than the water inlet area of the intake valve nose area.

[0016] Preferably, in the above technical solution, the multiple branches include:

[0017] Branch 1: The coolant passes through the cylinder gasket water hole to the exhaust valve nose area, flows along the spark plug cooling water jacket to the intake and exhaust valve nose area, and then to the lower layer of the integrated exhaust manifold water jacket, and finally flows to the main water outlet;

[0018] Branch 2: From the cylinder gasket water hole to the intake valve nose area, and reaches the main water outlet through the lower water jacket;

[0019] Branch 3: From the cylinder gasket water hole to the exhaust valve nose area or the intake valve nose area, passes through the lower water jacket to the gap between the bowl-shaped plug at the front end of the exhaust flange and the upper and lower water jackets, and then reaches the main water outlet after passing through the upper water jacket;

[0020] Branch four, from the water hole in the cylinder gasket to the nose area of the exhaust valve or the nose area of the intake valve, passes through five water holes, flows from the lower water jacket to the upper water jacket, and flows to the main water outlet through the upper water jacket of the integrated exhaust manifold;

[0021] Branch five, from the water hole in the cylinder gasket to the water intake branch of the upper water jacket, and then reaches the main water outlet.

[0022] Preferably, in the above technical solution, an oil cooler water inlet, a warm air water outlet, and an EGR water inlet are further provided at the rear end of the exhaust side of the cylinder head water jacket.

[0023] Preferably, in the above technical solution, the diameter of the cylinder gasket water hole on the exhaust side is larger than that of the cylinder gasket water hole on the intake side. The number of cylinder gasket water holes on the exhaust side is 4, and the number of cylinder gasket water holes on the intake side is 13.

[0024] Preferably, in the above technical solution, a pair of upper water holes are symmetrically arranged on both sides of the cylinder gasket water holes on the exhaust side of the four cylinders to increase the upper water area of the four cylinders.

[0025] Preferably, in the above technical solution, the flow limiting device is any one of a plug rod, a water distribution card, or a flow limiting hole, and is made of aluminum.

[0026] The above technical solution of the present invention has the following beneficial effects:

[0027] (1) It can achieve rapid warm-up and reduce fuel consumption. When under high load, the coolant can reduce the heat load of the exhaust manifold;

[0028] (2) Since the flow in the cylinder head is a mixed flow of cross flow and longitudinal flow, the cooling of each cylinder of the engine is more uniform, reducing the thermal effect in the key area and reducing the risk of knocking;

[0029] (3) Since the main water outlet is provided on the cylinder head and the upper and lower water jackets are connected by drilling, the heat exchange in the integrated exhaust manifold area is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0031] Figure 1 It is a schematic diagram of the high-efficiency engine cooling water jacket of the present invention.

[0032] Figure 2 It is a schematic diagram of the cylinder block water jacket.

[0033] Figure 3 It is a schematic diagram of the cylinder gasket water hole.

[0034] Figure 4 It is a schematic diagram of the cylinder head water jacket.

[0035] Figure 5 It is another perspective schematic diagram of the cylinder head water jacket.

[0036] Figure 6 It is yet another perspective schematic diagram of the cylinder head water jacket.

[0037] Figure 7 It is another perspective schematic diagram of the cylinder head water jacket.

[0038] In the figure: 1 - main water inlet, 2 - EGR water outlet, 3 - oil cooler water outlet, 4 - turbocharger water outlet, 5 - flow limiting device, 6 - V-shaped inter-cylinder hole, 7 - exhaust side cylinder gasket water hole, 8 - intake side cylinder gasket water hole, 9 - upper water jacket, 10 - lower water jacket, 11 - exhaust valve nose area, 12 - intake and exhaust valve nose area, 13 - intake valve nose area, 14 - oil cooler water inlet, 15 - main water outlet, 16 - heater water outlet, 17 - EGR water inlet, 19 - gap, 20 - water replenishing tank. Detailed implementation manners

[0039] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0040] Unless otherwise specified, the experimental methods used in the following embodiments are all conventional methods. The materials and reagents used, unless otherwise specified, can all be obtained from commercial channels. The equipment used in the experiments, unless otherwise specified, are all well-known to those skilled in the art.

[0041] As Figure 1 shown, an engine water jacket with efficient cooling includes a cylinder block water jacket, cylinder gasket water holes and a cylinder head water jacket. The following will be described in detail:

[0042] As Figures 2 - 3 shown, a main water inlet 1 is provided on the intake side at the front end of the cylinder block water jacket, and an EGR water outlet 2, an oil cooler water outlet 3 and a turbocharger water outlet 4 are arranged on the exhaust side of the cylinder block water jacket, providing coolant for the EGR, oil cooler and turbocharger respectively. A flow limiting device 5 is provided at the rear end of the cylinder block water jacket to prevent all the coolant on the exhaust side from flowing to the cylinder head. A V-shaped inter-cylinder hole 6 is provided between each cylinder of the cylinder block water jacket.

[0043] Furthermore, the flow limiting device 5 can be a plug rod, a water distribution card, a flow limiting hole, etc. By reducing the flow cross-section and increasing the flow resistance, the coolant flow rate is reduced. Flow limiting devices such as plug rods and water distribution cards are made of aluminum and are directly assembled to the cylinder block.

[0044] The water holes in the cylinder gasket are all upward water holes from the cylinder block to the cylinder head, including the intake-side cylinder gasket water holes 8 and the exhaust-side cylinder gasket water holes 7. Since the intake side is closer to the main water inlet 1, and the intake side of the cylinder head is the cooling channel for the intake valves and the water intake holes for the upper layer of the cylinder head, the diameter of the cylinder gasket water holes on the intake side is smaller, with a total of 13 upward water holes, namely the intake-side cylinder gasket water holes 8. Since the exhaust side is farther from the main water inlet, and the exhaust side is the water intake hole for the cooling channel of the exhaust valve nose area, one larger upward water hole is set for each cylinder on the exhaust side, namely the exhaust-side cylinder gasket water holes 7. Since the four cylinders (rear end) are farther from the main water inlet 1, in order to achieve better cooling effect of the four-cylinder cylinder head, the area of the upward water holes of the four cylinders is increased, and two additional small upward water holes are added. The two small upward water holes are respectively located on both sides of the exhaust-side cylinder gasket water holes 7 of the four cylinders.

[0045] Flow in the cylinder block water jacket: After the coolant enters the cylinder block water jacket from the main water inlet 1, it is divided into 3 branches:

[0046] Branch one flows along the intake-side water jacket and enters the cylinder head through the cylinder gasket water holes;

[0047] For branch two, the coolant enters the exhaust-side cylinder block water jacket from the intake-side cylinder block water jacket through three V-shaped inter-cylinder holes 6;

[0048] Branch three flows along the exhaust-side cylinder block water jacket and enters the cylinder head through the cylinder gasket water holes at the same time.

[0049] As Figures 4 - 7 shown, the cylinder head water jacket is a double-layer integrated exhaust manifold water jacket, which is divided into an upper water jacket 9 and a lower water jacket 10. The lower water jacket 10 is mainly used to cool the combustion chamber area. The combustion chamber area includes the spark plug area, the intake valve area and the exhaust valve area. The area between the two exhaust valves is the exhaust valve nose area 11, the area between the intake valve and the exhaust valve is the intake and exhaust valve nose area 12, and the area between the two intake valves is the intake valve nose area 13. Each cylinder has two water inlet holes for the intake valve nose area, which are arranged on the intake side of the cylinder block water jacket; each cylinder has one water inlet hole for the exhaust valve nose area, which is arranged on the exhaust side of the cylinder block water jacket. In order to take away the heat around the exhaust valve in time, the water inlet area of the exhaust valve nose area is larger than that of the intake valve nose area.

[0050] An oil cooler water inlet 14, a main water outlet 15, a heater water outlet 16 and the water inlets 17 for the supercharger and EGR are provided at the rear end of the exhaust side of the cylinder head water jacket. Arranging the main water outlet 15 at the integrated exhaust manifold water jacket is beneficial to strengthening the flow here and enhancing the heat transfer at the exhaust manifold. It is beneficial to reduce the warm-up time during cold start, and can achieve rapid warm-up and reduce fuel consumption; under high load, the coolant can reduce the thermal load of the exhaust manifold.

[0051] The upper and lower water jackets of the cylinder head enclose the exhaust manifold. There are three connection points between the upper and lower water jackets: (1) at the gap 19 between the cup plug and the upper and lower water jackets at the front end of the exhaust flange, where the connection is beneficial to improving heat transfer at the front end of the exhaust flange, avoiding heat stress concentration and causing damage; (2) the water replenishing groove 20 between the cup plug and the upper and lower water jackets at the rear end of the exhaust flange, which is beneficial to improving heat transfer at the rear end of the exhaust flange and between the upper and lower water jackets of the integrated exhaust manifold; (3) between two adjacent cylinders, at the front end of the first cylinder and the rear end of the fourth cylinder, the upper and lower water jackets are connected by water holes, a total of five water holes. The diameters of the water holes can be the same or different, and can be circular or other shapes, and are adjusted according to the heat transfer situation of the cylinder head water jacket. By increasing the flow from the lower water jacket to the upper water jacket, the heat transfer of the following branch is enhanced: exhaust valve bridge area (intake valve bridge area) - intake and exhaust valve bridge area - integrated exhaust manifold water jacket - main water outlet, especially improving the heat transfer of the intake and exhaust valve bridge areas and the upper water jacket of the integrated exhaust manifold. The diameters of these five water holes can be the same or different, depending on the heat transfer situation of the cylinder head water jacket.

[0052] Flow of coolant in the cylinder head water jacket: After the coolant enters the cylinder head water jacket from the cylinder block water jacket through the cylinder gasket water holes, it is divided into 5 branches:

[0053] Branch 1: The coolant flows from the cylinder gasket water holes to the exhaust valve bridge area, along the spark plug water jacket to the intake and exhaust valve bridge area, to the lower water jacket of the integrated exhaust manifold, and finally flows to the main water outlet;

[0054] Branch 2: From the cylinder gasket water holes to the intake valve bridge area, and reaches the main water outlet through the lower water jacket;

[0055] Branch 3: From the cylinder gasket water holes to the exhaust valve bridge area (intake valve bridge area), through the lower water jacket to the gap between the cup plug and the upper and lower water jackets at the front end of the exhaust flange, and finally reaches the main water outlet after passing through the upper water jacket;

[0056] Branch 4: From the cylinder gasket water holes to the exhaust valve bridge area (intake valve bridge area), through five water holes, flows from the lower water jacket to the upper water jacket, and flows to the main water outlet through the upper water jacket of the integrated exhaust manifold;

[0057] Branch 5: From the cylinder gasket water holes to the upper water jacket water intake branch, and then reaches the main water outlet.

[0058] The flow of coolant in the cylinder head water jacket includes both cross-flow from the intake and exhaust sides to the spark plug area and from the inlet side to the outlet side of the integrated exhaust manifold, and longitudinal flow from each cylinder to the main water outlet in the integrated exhaust manifold water jacket, that is, a mixed flow. The mixed flow can increase the flow in the integrated exhaust manifold water jacket on the premise of ensuring that the heat transfer in the key areas of the combustion chamber (exhaust valve bridge area, intake and exhaust valve bridge area) meets the requirements.

[0059] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various different choices and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is defined by the claims and their equivalent forms.

Claims

1. A high-efficiency engine cooling water jacket, characterized in that: include: A cylinder water jacket, wherein a main water inlet (1) is arranged on the front air inlet side, an EGR water outlet (2), an oil cooler water outlet (3) and a supercharger water outlet (4) are arranged on the exhaust side, a flow limiting device (5) for limiting the flow of coolant is arranged on the rear end of the cylinder water jacket, and a V-shaped inter-cylinder hole (6) is arranged between two adjacent cylinders; Cylinder gasket water holes, which are used to connect the cylinder water jacket and the cylinder head water jacket, and the cylinder gasket water holes include an exhaust side cylinder gasket water hole (7) located on the exhaust side of the cylinder water jacket and an intake side cylinder gasket water hole (8) located on the intake side of the cylinder water jacket; A cylinder head water jacket comprises an upper water jacket (9) and a lower water jacket (10), wherein the cylinder head water jacket is integrated with an exhaust manifold, wherein the upper water jacket (9) and the lower water jacket (10) are connected via at least three connecting points, and a main water outlet (15) is provided at the rear end of the exhaust side of the cylinder head water jacket. Coolant enters from the main water inlet (1) of the cylinder body water jacket, enters the cylinder head water jacket through the cylinder gasket water hole, and then flows in multiple branches, including a mixed flow of cross flow and longitudinal flow, and finally flows out through the main water outlet (15).

2. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: The connecting points include: the gap (19) between the bowl-shaped plug at the front end of the exhaust flange and the upper and lower water jackets, the water replenishment groove (20) between the bowl-shaped plug at the rear end of the exhaust flange and the upper and lower water jackets, and the water holes between adjacent cylinders and at the front end of the first cylinder and the rear end of the fourth cylinder.

3. The high-efficiency engine cooling water jacket according to claim 2, characterized in that: There are five water holes, the diameters of which are the same or different, and the specific locations are: the front end of the first cylinder, between the first cylinder and the second cylinder, between the second cylinder and the third cylinder, between the third cylinder and the fourth cylinder, and the rear end of the fourth cylinder.

4. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: The lower water jacket (10) is used to cool the combustion chamber area, including the spark plug area, the intake valve area and the exhaust valve area, the intake valve area including the intake valve nose bridge area (13), the exhaust valve area including the exhaust valve nose bridge area (11), an intake and exhaust valve nose bridge area (12) for transition is arranged between the intake valve nose bridge area (13) and the exhaust valve nose bridge area (11), and the flow path of the coolant in the combustion chamber area passes through the intake valve nose bridge area (13), the intake and exhaust valve nose bridge area (12) and the exhaust valve nose bridge area (11) to achieve uniform cooling.

5. The high-efficiency engine cooling water jacket according to claim 4, characterized in that: The water inlet area of ​​the exhaust valve nose bridge area (11) is larger than the water inlet area of ​​the intake valve nose bridge area (13).

6. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: Multiple branches include: Branch 1: The coolant flows through the cylinder gasket water hole to the exhaust valve nose bridge area (11), flows along the spark plug cooling water jacket to the intake and exhaust valve nose bridge area (12), to the lower water jacket of the integrated exhaust manifold, and finally flows to the main water outlet (15); Branch 2, from the cylinder gasket water hole to the intake valve nose bridge area (13), through the lower water jacket to the main water outlet (15); Branch three, from the cylinder gasket water hole to the exhaust valve nose bridge area (11) or the intake valve nose bridge area (13), through the lower water jacket to the gap between the bowl-shaped plug at the front end of the exhaust flange and the upper and lower water jackets (19), after passing through the upper water jacket, finally reaches the main water outlet (15); Branch 4, from the cylinder gasket water hole to the exhaust valve nose bridge area (11) or the intake valve nose bridge area (13), through five water holes, flows from the lower water jacket to the upper water jacket, and flows through the upper water jacket of the integrated exhaust manifold to the main water outlet (15); Branch 5, from the water hole of the cylinder pad to the upper water jacket water intake branch, and then to the main water outlet (15).

7. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: The rear end of the exhaust side of the cylinder head water jacket is also provided with an oil cooler water inlet (14), a warm air water outlet (16) and an EGR water inlet (17).

8. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: The diameter of the exhaust side cylinder gasket water hole (7) is greater than the diameter of the intake side cylinder gasket water hole (8), the number of the exhaust side cylinder gasket water holes (7) is 4, and the number of the intake side cylinder gasket water holes (8) is 13.

9. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: A pair of water supply holes are symmetrically arranged on both sides of the exhaust side cylinder gasket water hole (7) of the fourth cylinder to increase the water supply area of ​​the fourth cylinder.

10. The high-efficiency engine cooling water jacket according to claim 1, characterized in that: The flow limiting device (5) is any one of a blocking rod, a water dividing card or a flow limiting hole, and is made of aluminum.

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