Engine cooling water jacket structure and engine

Abstract

The present invention provides an engine cooling water jacket structure, which includes a cylinder water jacket arranged outside a multi-cylinder cylinder body and a cylinder head water jacket arranged at the top of the cylinder water jacket, the cylinder water jacket includes a first cylinder water jacket, a second cylinder water jacket arranged outside the cylinder bore, and a third cylinder water jacket, the cylinder head water jacket includes a first cylinder head water jacket for cooling the combustion chamber, a second cylinder head water jacket for cooling the exhaust manifold, and a third cylinder head water jacket communicating with the water outlets of the second cylinder water jacket and the third cylinder water jacket, the water outlet of the first cylinder water jacket communicates with the second cylinder water jacket, the first cylinder head water jacket and the second cylinder head water jacket respectively, the water outlets of the first cylinder head water jacket and the second cylinder head water jacket communicate with the third cylinder water jacket, the coolant flowing into the second cylinder water jacket through the first cylinder water jacket is discharged through the third cylinder head water jacket, the coolant flowing into the first cylinder head water jacket and the second cylinder head water jacket through the first cylinder water jacket flows into the third cylinder head water jacket through the third cylinder water jacket and is discharged. The present invention also provides an engine.

Description

Technical Field

[0001] The invention relates to the field of cooling of a cylinder block of a multi-cylinder internal combustion engine, and in particular to an engine cooling water jacket structure and an engine. Background Art

[0002] The engine water jacket is generally designed with cooling channels only at the parts that need cooling. The problem with this design is that it cannot evenly cool the cylinders of the engine. In the existing technical solutions, generally only the problem of cooling the cylinder block and the cylinder head is considered, and this problem is solved by designing a layer of coolant jacket outside the cylinder. Although this solution has a simple structure, it also has a single function and cannot evenly cool the cylinders on the cylinder head, thereby causing unnecessary heat loss on the cylinder head. In addition, it is limited by the overall performance of the water pump (i.e. the overall cooling performance), and it is impossible to further improve the thermal efficiency by increasing the compression ratio of the engine, thereby limiting the potential of the engine to reduce fuel consumption.

[0003] Therefore, in order to ensure that all cylinders are adequately cooled, the prior art usually achieves this goal by increasing the flow rate of the water pump, but this will cause overcooling of some cylinders, thereby causing unnecessary energy loss; at the same time, since unnecessary heat dissipation of the cylinder body is inevitable, and the cooling requirements of the cylinder head are generally higher than those of the cylinder body, it is particularly important to design the coolant jacket structure on the cylinder head to achieve uniform heat dissipation of all cylinders while meeting the cooling requirements of the cylinder head itself. Summary of the invention

[0004] In view of this, it is necessary to provide an engine cooling water jacket structure and an engine that can meet the cooling requirements of the cylinder head itself and ensure uniform heat dissipation of each cylinder.

[0005] The present invention provides an engine cooling water jacket structure, which includes a cylinder water jacket arranged outside a multi-cylinder cylinder body and a cylinder head water jacket arranged at the top end of the cylinder water jacket, the cylinder water jacket includes a first cylinder water jacket, a second cylinder water jacket and a third cylinder water jacket arranged outside a cylinder bore, the cylinder head water jacket includes a first cylinder head water jacket for cooling a combustion chamber, a second cylinder head water jacket for cooling an exhaust manifold, and a third cylinder head water jacket whose water outlets are connected with the second cylinder water jacket and the third cylinder water jacket, the water outlet of the first cylinder water jacket is connected with the second cylinder water jacket, the first cylinder head water jacket and the second cylinder head water jacket, the water outlets of the first cylinder head water jacket and the second cylinder head water jacket are connected with the third cylinder water jacket, the coolant flowing into the second cylinder water jacket through the first cylinder water jacket is discharged through the third cylinder head water jacket, and the coolant flowing into the first cylinder head water jacket and the second cylinder head water jacket through the first cylinder water jacket flows into the third cylinder head water jacket through the third cylinder water jacket and is discharged.

[0006] Furthermore, the first cylinder water jacket is a water pump volute integrated at the front end of the cylinder body, and the second cylinder water jacket and the third cylinder water jacket are independent of each other.

[0007] Furthermore, the first cylinder head water jacket includes a first cooling channel connected to the water inlet of the first cylinder head water jacket, a second cooling channel connected to the first cooling channel, a third cooling channel formed by branching the second cooling channel, and a return channel formed at the outlet end of the third cooling channel, the third cooling channel is distributed outside the combustion chamber of each cylinder, and the water outlet of the return channel is connected to the third cylinder body water jacket.

[0008] Further, the third cooling channel is a "transverse cooling channel" provided between the outlet of the second cooling channel and the inlet of the reflow channel.

[0009] Furthermore, the second cooling channel has multiple outlets with the same inner diameter, and the outlets of the reflow channel correspond one-to-one to the cylinder body.

[0010] Furthermore, the second cylinder head water jacket includes a first flow channel connected to the first cylinder body water jacket, a second flow channel and a third flow channel formed by branching at the water outlet of the first flow channel, and a fourth flow channel formed by merging at the ends of the second flow channel and the third flow channel, the water outlet of the fourth flow channel is connected to the third cooling channel, the coolant flowing into the first flow channel flows into the second flow channel and the third flow channel, flows into the third cooling channel after merging into the fourth flow channel, and flows into the third cylinder body water jacket through the reflux channel.

[0011] Furthermore, the exhaust manifold is integrated on the cylinder head, and the exhaust manifold is sandwiched between the second flow channel and the third flow channel.

[0012] Furthermore, the engine cooling water jacket structure also includes a cylinder gasket connecting the cylinder head water jacket and the cylinder body water jacket, and the cylinder gasket includes a first upper water inlet connecting the first cylinder head water jacket and the first cylinder body water jacket and a second upper water inlet connecting the second cylinder head water jacket and the first cylinder body water jacket.

[0013] Further, the cylinder gasket includes a water outlet connecting the second cylinder water jacket with the water inlet and the third cylinder head water jacket, a water return port connecting the water outlet of the reflux channel with the water inlet of the third cylinder water jacket, and a fourth water return port connecting the water outlet of the third cylinder water jacket with the water inlet of the third cylinder head water jacket.

[0014] The present invention also provides an engine, which comprises the engine cooling water jacket structure described above.

[0015] In summary, the present invention realizes cooling of the cylinder bore, combustion chamber and exhaust manifold of the engine cylinder block by designing the structures of the cylinder water jacket and the cylinder head water jacket, and connecting the first cylinder water jacket with the second cylinder water jacket, the first cylinder head water jacket and the second cylinder head water jacket in parallel; at the same time, further by opening a second cooling channel with stable hydraulic pressure in the first cylinder water jacket and dividing the flow on the second cooling channel to form a third cooling channel of a "transverse cooling channel", uniform cooling of the combustion chamber of each cylinder of the engine is realized, thereby improving the compression ratio and thermal efficiency of the engine.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of the engine cooling water jacket structure provided by the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the water jacket of the middle cylinder body;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the water jacket of the cylinder head;

[0020] Figure 4 A schematic structural diagram of a cylinder gasket in an engine cooling water jacket structure provided by the present invention. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the present invention is described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0022] like Figure 1 to Figure 4 As shown, the present invention provides an engine cooling water jacket structure, which includes a cylinder water jacket 10 arranged outside multiple cylinders on the engine and a cylinder head water jacket 20 arranged at the top of the cylinder water jacket 10.

[0023] like Figure 1 and Figure 2As shown, the cylinder water jacket 10 in the present invention includes a first cylinder water jacket 11, a second cylinder water jacket 12 and a third cylinder water jacket 13 arranged outside the cylinder bore of the engine, and the second cylinder water jacket 12 and the third cylinder water jacket 13 are independent of each other (the second cylinder water jacket 12 and the third cylinder water jacket 13 are not connected). In a preferred embodiment, the first cylinder water jacket 11 and the third cylinder water jacket 13 are respectively located on both sides of the second cylinder water jacket 12, and the first cylinder water jacket 11 is a water pump volute integrated at the front end of the cylinder body to provide coolant for cooling the engine cylinder body.

[0024] like Figure 3 As shown, the cylinder head water jacket 20 in the present invention includes a first cylinder head water jacket 21 for cooling the combustion chamber, a second cylinder head water jacket 22 for cooling the exhaust manifold (disposed on the cylinder head of the engine), and a third cylinder head water jacket 23 for connecting the water outlets of the second cylinder water jacket 12 and the third cylinder water jacket 13.

[0025] Reference again Figure 1 and Figure 2 In the present invention, the water outlet of the first cylinder water jacket 11 is connected to the second cylinder water jacket 12, the first cylinder head water jacket 21 and the second cylinder head water jacket 22, and the water outlets of the first cylinder head water jacket 21 and the second cylinder head water jacket 22 are connected to the third cylinder water jacket 13, so that the coolant flowing out of the first cylinder water jacket 11 is divided into three streams of coolant to flow into the second cylinder water jacket 12, the first cylinder head water jacket 21 and the second cylinder head water jacket 22 respectively, and the coolant flowing into the second cylinder water jacket 12 directly cools the cylinder of the engine, and then flows into the third cylinder head water jacket 23 and is directly discharged outside the engine; refer to Figure 3 At the same time, the coolant flowing into the first cylinder head water jacket 21 first flows back to the third cylinder water jacket 13, and flows into the third cylinder head water jacket 23 from the water outlet of the third cylinder water jacket 13, and finally the coolant is discharged out of the engine to realize cooling of the cylinder head combustion chamber of the engine; and the coolant flowing into the second cylinder head water jacket 22 flows through the exhaust manifold on the engine cylinder head to cool the exhaust manifold, and then flows into the third cylinder water jacket 13 through the first cylinder head water jacket 21, and finally flows into the third cylinder head water jacket 23 through the water outlet of the third cylinder water jacket 13 to discharge the coolant out of the engine. The present invention utilizes the structural design of the engine cylinder water jacket 10 and the cylinder head water jacket 20 to achieve parallel cooling of the first cylinder water jacket 11, the first cylinder head water jacket 21 and the second cylinder head water jacket 22, thereby realizing cooling of the exhaust manifold and the cylinder block (cylinder bore) on the engine respectively.

[0026] Specifically, the first cylinder head water jacket 21 provided by the present invention includes a first cooling channel 21a connected to the water inlet of the first cylinder head water jacket 21, a second cooling channel 21b connected to the first cooling channel 21a, a plurality of third cooling channels 21c formed by branching the second cooling channel 21b, and a return channel 21d formed at the outlet end of the third cooling channel 21c (with emphasis on Figure 1 and Figure 3 ), since the third cooling channel 21 is distributed outside the combustion chamber of each cylinder of the engine, and the water outlet of the return channel 21d is connected to the water inlet of the third cylinder water jacket 13, and the water outlet of the third cylinder water jacket 13 is connected to the third cylinder head water jacket 23, the coolant flowing into the return channel 21d through the third cooling channel 21c flows into the third cylinder water jacket 13, and then flows into the third cylinder head water jacket 23 through the water outlet of the third cylinder water jacket 13 and is discharged, thereby realizing the cooling of the combustion chamber of each cylinder of the engine.

[0027] In a specific embodiment provided by the present invention, the second cooling channel 21b has multiple outlets with the same inner diameter (to ensure that the coolant flowing from each outlet of the second cooling channel 21b into the third cooling channel 21c is uniform), and the third cooling channel 21c is a "transverse cooling channel" arranged between the outlet of the second cooling channel 21b and the inlet of the return channel (the cooling channel formed from the front end to the rear end of the engine is a "longitudinal cooling channel", so the "transverse cooling channel" can be understood as a cooling channel formed along the left and right sides of the engine), and the outlet of the return channel 21d corresponds one-to-one with the cylinder block of the engine, thereby realizing "cross-flow cooling" of the combustion chamber of each cylinder of the engine.

[0028] In the present invention, since the second cooling channel 21b is added before the coolant enters the combustion chamber for cooling, it can play the role of storing coolant and stabilizing the coolant pressure in the second cooling channel 21b, so that the coolant flowing out of the first cooling channel 21b will first flow into and fill the second cooling channel 21b, and then be evenly distributed from the second cooling channel 21b to the third cooling channel 21c, avoiding the problem of different cooling degrees caused by different amounts of coolant directly flowing into multiple third cooling channels 21c at different positions; at the same time, since the third cylinder water jacket 13 is added to connect the coolant flowing out of the return channel 21d to stabilize the hydraulic pressure at the outlet of the return channel 21d, it is beneficial to guide the coolant to flow evenly to the third cooling channel 21c, so as to evenly cool the combustion chambers of each cylinder of the engine. At the same time, the present invention can effectively improve the cooling effect of the combustion chambers of each cylinder by increasing the cooling water volume of the first cylinder head water jacket 11, thereby providing a possibility for improving the compression ratio of the engine (increasing the compression ratio will make the combustion temperature higher, and a more effective cooling effect is required to keep the wall temperature of the cylinder head within a limit value), thereby improving the compression ratio and thermal efficiency of the engine.

[0029] Further, refer again Figure 3The second cylinder head water jacket 22 includes a first flow channel 22a connected to the first cylinder body water jacket, a second flow channel 22b and a third flow channel 22c formed by branching at the water outlet of the first flow channel 22a, and a fourth flow channel 22d formed by merging at the ends of the second flow channel 22b and the third flow channel 22c; correspondingly, the exhaust manifold is integrated in the cylinder head of the engine cylinder, the exhaust manifold is sandwiched between the second flow channel 22b and the third flow channel 22c, and the water outlet of the fourth flow channel 22d is connected to the third cooling channel 12c, so that the coolant flowing into the first flow channel 22a is branched and flows into the second flow channel 22b and the third flow channel 22c to cool the exhaust manifold on the cylinder head of the engine. After cooling, the coolant is merged and flows into the fourth flow channel 22d and then into the third cooling channel 21c, and then flows from the third cooling channel 21c into the third cylinder water jacket 13 through the reflux channel 21d, and finally flows from the third cylinder water jacket 13 into the third cylinder head water jacket 23 and then is discharged from the engine. Due to the action of the third cylinder water jacket 13, the coolant is evenly divided and flows into the second flow channel 22b and the third flow channel 22c to achieve the effect of uniform cooling of the upper and lower sides of the exhaust manifold. At the same time, the coolant after cooling the exhaust manifold flows into the third cooling channel 21c again to achieve further cooling of the cylinder head combustion chamber, effectively utilizing the cooling capacity of the water pump and avoiding unnecessary heat loss.

[0030] The present invention utilizes the low pressure at the water outlet of the third cylinder head water jacket 23 to guide the isothermal water flow of the second cooling channel 21b and the first flow channel 22a to be evenly divided.

[0031] In the present invention, the engine cooling water jacket structure further includes a cylinder gasket 30 connecting the cylinder water jacket 10 and the cylinder head water jacket 20. In a preferred embodiment, the cylinder head water jacket 20, the cylinder gasket 30 and the cylinder water jacket 10 are stacked from top to bottom and fastened and installed by bolts, so that the cylinder water jacket 10 is connected to the cylinder head water jacket 20 through the cylinder gasket 30.

[0032] Specifically, Figure 4As shown, the cylinder gasket 30 includes a first water inlet 31 connecting the water outlet of the first cylinder head water jacket 21 and the water inlet of the first cylinder water jacket 11, a second water inlet 32 ​​connecting the water outlet of the second cylinder head water jacket 22 and the water inlet of the first cylinder water jacket 11, a third water inlet 33 connecting the water outlet of the second cylinder water jacket 12 and the water inlet of the third cylinder head water jacket 23, a return water inlet 34 connecting the water outlet of the return channel 21d and the water inlet of the third cylinder water jacket 13, and a fourth water inlet 35 connecting the water outlet of the third cylinder water jacket 13 and the water inlet of the third cylinder head water jacket 23. The cylinder gasket 30 provided by the present invention It not only plays a connecting role, but also can accurately control the flow rate and flow rate of the coolant flowing into the engine cylinder block hole, the engine cylinder head combustion chamber and the cylinder head exhaust manifold by controlling the size of the water inlet of the first cylinder water jacket 11 entering the first cylinder head water jacket 21, and controlling the size of the first water inlet 31 and the second water inlet 32 ​​to control the water intake amount, thereby achieving precise control of the cooling of the three parts, effectively controlling the temperature of the above three parts, and then reducing the charging loss to improve the power of the engine; improving the effective power utilization rate of the water pump, avoiding unnecessary heat loss, and reducing the fuel consumption of the engine.

[0033] The present invention also provides an engine, including the above-mentioned engine cooling water jacket structure. For the specific structure and content of the multi-cylinder engine, as well as the specific connection structure and content of the cylinder and cylinder body of the engine, reference can be made to the prior art, and the details will not be repeated here.

[0034] In summary, the present invention realizes cooling of the cylinder bore, combustion chamber and exhaust manifold of the engine cylinder block by designing the structures of the cylinder water jacket and the cylinder head water jacket, and connecting the first cylinder water jacket with the second cylinder water jacket, the first cylinder head water jacket and the second cylinder head water jacket in parallel; at the same time, by further providing a second cooling channel with stable hydraulic pressure in the first cylinder water jacket and dividing the flow on the second cooling channel to form a third cooling channel of a "transverse cooling channel", uniform cooling of the combustion chamber of each cylinder of the engine is realized, and the compression ratio and thermal efficiency of the engine are improved; at the same time, by adjusting the size of the through hole on the cylinder gasket between the cylinder water jacket and the cylinder head water jacket, the flow rate of the coolant flowing into the cylinder head water jacket is controlled, and the cooling effect on the cylinder bore, exhaust manifold and combustion chamber of the engine cylinder block is accurately controlled, thereby reducing the fuel consumption of the engine.

[0035] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An engine cooling water jacket structure, comprising a cylinder water jacket (10) arranged outside a multi-cylinder cylinder body and a cylinder head water jacket (20) arranged at the top of the cylinder water jacket (10), characterized in that: The cylinder water jacket (10) comprises a first cylinder water jacket (11), a second cylinder water jacket (12) and a third cylinder water jacket (13) arranged outside the cylinder bore; the cylinder head water jacket (20) comprises a first cylinder head water jacket (21) for cooling the combustion chamber, a second cylinder head water jacket (22) for cooling the exhaust manifold, and a third cylinder head water jacket (23) whose water outlets are connected to the second cylinder water jacket (12) and the third cylinder water jacket (13); the water outlet of the first cylinder water jacket (11) is respectively connected to the second cylinder water jacket (12), the first cylinder head water jacket (21) and the second cylinder head water jacket (22); the water outlets of the first cylinder head water jacket (21) and the second cylinder head water jacket (22) are connected to the third cylinder water jacket (13); the coolant flowing into the second cylinder water jacket (12) through the first cylinder water jacket (11) is cooled by the cooling fluid; The cooling liquid discharged from the third cylinder head water jacket (23) and flowing into the first cylinder head water jacket (21) and the second cylinder head water jacket (22) through the first cylinder body water jacket (11) flows into the third cylinder head water jacket (23) through the third cylinder body water jacket (13) and is discharged; the first cylinder head water jacket (21) comprises a first cooling channel (21a) connected to a water inlet of the first cylinder head water jacket (21), a second cooling channel (21b) connected to the first cooling channel (21a), a third cooling channel (21c) formed by branching the second cooling channel (21b), and a return channel (21d) formed at the outlet end of the third cooling channel (21c); the third cooling channel (21c) is distributed outside each combustion chamber of the engine, and the water outlet of the return channel (21d) is connected to the third cylinder body water jacket (13).

2. The engine cooling water jacket structure according to claim 1, characterized in that: The first cylinder water jacket (11) is a water pump volute integrated at the front end of the cylinder body, and the second cylinder water jacket (12) and the third cylinder water jacket (13) are independent of each other.

3. The engine cooling water jacket structure according to claim 1, characterized in that: The third cooling channel (21c) is a "transverse cooling channel" provided between the outlet of the second cooling channel (21b) and the inlet of the return channel (21d).

4. The engine cooling water jacket structure according to claim 3, characterized in that: The second cooling channel (21b) has multiple outlets with the same inner diameter, and the outlets of the return channel (21d) correspond one-to-one to the cylinder body.

5. The engine cooling water jacket structure according to claim 4, characterized in that: The second cylinder head water jacket (22) comprises a first flow channel (22a) connected to the first cylinder body water jacket (11), a second flow channel (22b) and a third flow channel (22c) formed by diverging at the water outlet of the first flow channel (22a), and a fourth flow channel (22d) formed by merging at the ends of the second flow channel (22b) and the third flow channel (22c), wherein the water outlet of the fourth flow channel (22d) is connected to the third cooling channel (21c), and the coolant flowing into the first flow channel (22a) flows into the second flow channel (22b) and the third flow channel (22c), and then flows into the third cooling channel (21c) after merging into the fourth flow channel (22d), and flows into the third cylinder body water jacket (13) through the return channel (21d).

6. The engine cooling water jacket structure according to claim 5, characterized in that: The exhaust manifold is integrated on the cylinder head, and the exhaust manifold is sandwiched between the second flow channel (22b) and the third flow channel (22c).

7. The engine cooling water jacket structure according to claim 5 or 6, characterized in that: The engine cooling water jacket structure also includes a cylinder gasket (30) connecting the cylinder head water jacket (20) and the cylinder body water jacket (10); the cylinder gasket (30) includes a first upper water inlet (31) connecting the first cylinder head water jacket (21) and the first cylinder body water jacket (11) and a second upper water inlet (32) connecting the second cylinder head water jacket (22) and the first cylinder body water jacket (11).

8. The engine cooling water jacket structure according to claim 7, characterized in that: The cylinder gasket (30) comprises a third water inlet (33) connecting the water outlet of the second cylinder water jacket (12) and the water inlet of the third cylinder head water jacket (23), a water return inlet (34) connecting the water outlet of the return channel (21d) and the water inlet of the third cylinder water jacket (13), and a fourth water inlet (35) connecting the water outlet of the third cylinder water jacket (13) and the water inlet of the third cylinder head water jacket (23).

9. An engine, characterized in that: The invention comprises the engine cooling water jacket structure as described in any one of claims 1 to 8.

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