CN109854404B - Engine cooling system and engine - Google Patents
Engine cooling system and engine Download PDFInfo
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- CN109854404B CN109854404B CN201811628228.XA CN201811628228A CN109854404B CN 109854404 B CN109854404 B CN 109854404B CN 201811628228 A CN201811628228 A CN 201811628228A CN 109854404 B CN109854404 B CN 109854404B
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Abstract
The invention provides an engine cooling system and an engine, the engine cooling system comprises a cylinder cooling water channel arranged on a cylinder block and a cylinder cover cooling water channel arranged in a cylinder cover, the cylinder cooling water channel is used for cooling a cylinder sleeve arranged above the cylinder block, a cooling water cavity is arranged in the cylinder cover, the cooling water cavity comprises an upper water cavity and a lower water cavity, cooling water enters the cylinder cover cooling water channel through the cylinder cooling water channel to cool the cylinder cover, different communication holes are arranged in the cylinder cover, and the different communication holes are communicated with the upper water cavity and/or the lower water cavity to form at least two cylinder cover cooling water channels so as to cool different areas of the cylinder cover. The invention sets multi-path cooling branches by casting a casting hole, machining and other means, and forcibly cools the part with higher thermal load of the cylinder cover, thereby effectively improving the cooling effect of the engine and prolonging the service life of the engine; the high-temperature cooling module is independently designed, so that the machine body structure is greatly simplified, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of engine cooling, in particular to an engine cooling system and an engine.
Background
With the increasing strength of the engine and the increasing heat load, the high heat load becomes the toggle point of the engine development, and the service life of the engine is severely restricted. Particularly, the nose bridge area between two valve retainer holes at the bottom of the cylinder cover is narrow in width and high in thermal load, and is one of the weakest parts of fatigue strength. The nose bridge area has high heat load, is easy to generate thermal fatigue and cracks, and influences the service life of the cylinder cover.
Disclosure of Invention
The object of the present invention is to solve at least one of the above drawbacks and disadvantages, and is achieved by the following technical solution.
The invention provides an engine cooling system which comprises a cylinder body cooling water channel arranged on a cylinder body and a cylinder cover cooling water channel arranged in a cylinder cover, wherein the cylinder body cooling water channel is used for cooling a cylinder sleeve arranged above the cylinder body, a cooling water cavity is arranged in the cylinder cover, the cooling water cavity comprises an upper layer water cavity and a lower layer water cavity, cooling water enters the cylinder cover cooling water channel through the cylinder body cooling water channel to cool the cylinder cover, different communication holes are arranged in the cylinder cover, and the different communication holes are communicated with the upper layer water cavity and/or the lower layer water cavity to form at least two cylinder cover cooling water channels so as to cool different areas of the cylinder cover.
Further, cylinder body cooling water route is established including the cover the cooling water jacket of the periphery of cylinder jacket, the cylinder jacket with certain clearance has between the cooling water jacket, the clearance forms the cooling water cavity in cylinder body cooling water route.
Further, the at least two cylinder cover cooling water paths comprise a first cooling water path and a second cooling water path, and in the first cooling water path, cooling water enters the lower-layer water cavity from the cylinder body cooling water path and enters the upper-layer water cavity through a first cooling channel; in the second cooling water channel, cooling water enters the upper water cavity from the cylinder body cooling water channel through a second cooling channel.
Furthermore, in the first cooling water channel, the cylinder body cooling water channel is communicated with the lower water cavity through a first communication hole, one end of the first communication hole is communicated with the cooling water jacket, and the other end of the first communication hole is communicated with the lower water cavity.
Further, the first cooling passage includes a second communication hole provided between the lower water chamber and the upper water chamber and/or a third communication hole provided between the lower water chamber and the valve seat.
Further, the second cooling passage includes a fourth communication hole provided in a nose bridge region of the cylinder head and communicating with the upper water chamber.
Further, the fourth communication hole includes a lateral through hole and an inclined through hole provided in a bottom plate of the cylinder head, one end of the lateral through hole communicates with the cooling water jacket, the other end of the lateral through hole communicates with one end of the inclined through hole, and the other end of the inclined through hole communicates with the upper water chamber.
Further, the second cooling passage further includes a fifth communication hole communicating with the upper water chamber, one end of the fifth communication hole communicating with the cooling water jacket, and the other end of the fifth communication hole communicating with the upper water chamber.
Further, the communication hole is a machined through hole and/or a cast through hole.
The invention also provides an engine comprising the engine cooling system.
The invention has the following advantages:
(1) the invention sets multiple cooling branches by means of casting a casting hole, machining and the like, and respectively carries out forced cooling on the parts with higher thermal load of the cylinder cover, thereby effectively improving the cooling effect of the cylinder sleeve, the cylinder cover and accessories of the cylinder cover, effectively reducing the local thermal deformation of the cylinder cover, causing cracks, poor sealing and the like, and prolonging the service life of the engine.
(2) The invention takes the high-temperature cooling of the engine as an independent module to cool the cylinder sleeve and the cylinder cover with higher temperature, the cylinder sleeve of the cooling part is arranged outside, and a water channel is not arranged in the cylinder body, thereby greatly simplifying the structure of the engine body and reducing the casting cost and the production cost of the engine.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
FIG. 1 is a side cross-sectional view of an engine cooling system provided in accordance with an embodiment of the present invention;
3 FIG. 32 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 31 3; 3
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
the reference numbers in the figures are as follows:
10-cylinder block 20-cylinder head
30-cylinder jacket 40-cooling water jacket
50-valve seat ring 60-oil injector jacket
1-first communication hole 2-second communication hole
31-third communicating hole 32-water outlet
4-fourth communication hole 41-transverse through hole
42-inclined through hole 5-fifth communication hole
201-upper layer water cavity 202-lower layer water cavity
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 to 3 are schematic structural views illustrating an engine cooling system provided according to an embodiment of the present invention (the direction of arrows in the drawings is a water flow direction). As shown in fig. 1, the engine cooling system is a high-temperature cooling system including a block cooling water passage provided in a cylinder block 10 and a head cooling water passage provided in a cylinder head 20. The cylinder block 10 is provided with a cylinder sleeve 30, the upper part of the cylinder sleeve 30 is higher than the cylinder block 10 by a certain distance, the periphery of the cylinder sleeve 30 is sleeved with a cooling water jacket 40, the cooling water jacket 40 is sleeved on the periphery of the cylinder sleeve 30 higher than the part of the cylinder block 10, a gap is formed between the cylinder sleeve 30 and the cooling water jacket 40 to form a first cooling water cavity for cooling the cylinder block 10, and cooling water enters the first cooling water cavity from one side of the cooling water jacket 40 to cool the upper part of the cylinder sleeve 30 and the bottom of the cylinder head 20; the cooling water flows out from the other side (not shown) of the cooling water jacket 40 into the next cylinder to cool the different cylinders.
In a specific implementation, the portion of the cylinder liner 30 that is higher than the cylinder block 10 is approximately 1/3 of the portion of the cylinder liner 30. The cylinder body cooling water path only cools 1/3 part of the upper part of the cylinder sleeve 20, and the uniform thermal expansion amount of the cylinder sleeve is ensured.
A second cooling water cavity for cooling the cylinder head 20 is provided in the cylinder head 20, and includes an upper water cavity 201 and a lower water cavity 202. Cooling water enters the bottom of the cylinder head 20 through a cylinder cooling water channel to cool the cylinder head 20, different communication holes are formed in the cylinder head 20, and the different communication holes are communicated with the upper-layer water cavity 201 and/or the lower-layer water cavity 202 to form at least two cylinder head cooling water channels so as to cool different areas of the cylinder head 20.
At least two cooling water paths of the cylinder cover cooling water path comprise a first cooling water path and a second cooling water path, wherein in the first cooling water path, cooling water enters the lower-layer water cavity 202 from the cylinder body cooling water path and enters the upper-layer water cavity 201 through a first cooling channel; in the second cooling water path, the cooling water directly enters the upper water chamber 201 from the cylinder cooling water path through the second cooling channel.
The cylinder cooling water path is communicated with the lower water chamber 202 through a first communication hole 1 arranged in the cylinder head 20, one end of the first communication hole 1 is communicated with the cooling water jacket 40, the other end of the first communication hole 1 is communicated with the lower water chamber 202, and cooling water entering from one side of the cooling water jacket 40 enters the lower water chamber 202 through the first communication hole 1 to cool the bottom of the cylinder head 20.
The first cooling channel comprises a second communication hole 2 arranged between the lower water cavity 202 and the upper water cavity 201, the upper water cavity 201 and the lower water cavity 202 are communicated through the second communication hole 2, and the lower water cavity 202, the second communication hole 2 and the upper water cavity 201 are sequentially communicated to form a first cooling branch. The cooling water introduced into the lower water chamber 202 flows through the second communication hole 2 and then enters the upper water chamber 201 of the cylinder head 20. The second communicating hole 2 is an inclined through hole, and the upper-layer water cavity 201 and the lower-layer water cavity 202 are communicated in a drilling mode, so that the throttling effect can be achieved.
In specific implementation, the upper water chamber 201 and the lower water chamber 202 may be separated by an intermediate partition plate, and a through hole is formed in the intermediate partition plate to communicate the upper water chamber 201 and the lower water chamber 202, so that the cooling water is cooled from bottom to top, and the bottom of the cylinder head 20 with a higher temperature is preferentially cooled. The first cooling branch circuits which are communicated with each other are formed through the middle partition plate, so that the heat load borne by the cylinder cover 20 can be effectively reduced, and the service life of the cylinder cover is prolonged; meanwhile, the middle partition plate can increase the rigidity of the cylinder cover and improve the load strength of the cylinder cover.
The first cooling channel further comprises a third communication hole 31 arranged on the other side of the lower water cavity 202, one end of the third communication hole 31 is communicated with the lower water cavity 202, the other end of the third communication hole 31 is communicated with one side of the valve seat ring 50, a water outlet 32 is arranged on the other side of the valve seat ring 50, and the water outlet 32 is communicated with the upper water cavity 201 to form a second cooling branch. The cooling water entering the lower water chamber 202 can flow through the third communication hole 31 and the surrounding area of the valve seat 50 to cool the valve seat 50, and the cooled cooling water flows into the upper water chamber 201 through the water outlet 32 and is discharged from the water outlet of the upper water chamber 201.
Because the working environment around the valve and valve seat insert 50 is harsh, higher ambient temperatures can reduce the service life of the valve and valve seat insert 50, resulting in abnormal wear or breakage of the valve and valve seat insert 50. The second cooling branch is arranged around the valve and the valve seat ring 50, so that the part can be sufficiently cooled, the temperature of the valve seat ring 50 is effectively reduced, and the service life of the valve seat ring is prolonged. At this time, the valve seat 50 may be made of a material that is relatively non-resistant to high temperature, or a valve seat surfacing technique may not be used, thereby reducing the production cost of the engine.
The second cooling channel comprises a fourth communication hole 4 arranged in the nose bridge area, one end of the fourth communication hole 4 is communicated with one side of the cooling water jacket 40, and the other end of the fourth communication hole 4 is communicated with the upper water cavity 201 to form a third cooling branch.
The fourth communication hole 4 comprises a transverse through hole 41 horizontally arranged in the cylinder head base plate, and cooling liquid enters the transverse through hole 41 from the cooling water jacket 40 and transversely flows in the nose bridge area to cool the nose bridge area with higher temperature; a section of inclined through hole 42 is arranged at a position close to the oil sprayer jacket 60 along the flowing direction of the cooling water, so that the fourth communication hole 4 is communicated with the upper water cavity 1, and the cooling water flowing through the bridge region flows into the upper water jacket 201 through the guidance of the inclined through hole 42.
The third cooling branch can strengthen the cooling strength of the cylinder head base plate (fire plate), ensure the cooling of the area with the maximum heat load of the cylinder head 20 and prolong the service life of the cylinder head 20. Especially to the cooling in nose bridge district, because nose bridge district is narrower, the velocity of flow risees through nose bridge district back to cooling rivers, and heat transfer capacity strengthens for the heat in nose bridge district can be dispelled fast, has effectually reduced here temperature, makes cylinder head 20's whole temperature field more even, is difficult for producing the heat altered shape, and then influences cylinder head intensity, the sealed etc. of cylinder head gasket. In addition, the third cooling branch can also cool the lower part of the fuel injector jacket 60, so that the service environment of the fuel injector is improved, and the service life of the fuel injector is prolonged.
The second cooling channel further comprises a fifth communication hole 5 communicated with the upper-layer water cavity 201, one end of the fifth communication hole 5 is communicated with the cooling water jacket 40, the other end of the fifth communication hole 5 is communicated with the upper-layer water cavity 201 to form a fourth cooling branch, the fourth cooling branch is a bypass cooling water path, cooling water entering from one side of the cooling water jacket 40 can directly enter the upper-layer water cavity 201 through the fifth communication hole 5 to compensate other cooling branches, and the circulating cooling effect of the cooling water is guaranteed.
In a specific implementation, the first to fifth communication holes may be machined or cast, the first communication hole 1 is preferably a cast, and the second to fifth communication holes 2 to 5 are preferably machined. Through the mode of drilling, set up different cooling branch roads, cool off around the higher cylinder head nose bridge district of temperature and the air flue, be equipped with bypass cooling branch road simultaneously, simple structure, the practicality is strong to can guarantee the even effect of holistic cooling of cylinder head.
In addition, the upper water cavity 201 of the cylinder head 20 adopts an upper and lower mold splitting mode for facilitating casting and drawing, and adopts a cross mold splitting mode for avoiding a water channel blocking boundary caused by blank seams.
The invention also provides an engine comprising the engine cooling system.
The invention sets multiple cooling branches by means of casting a casting hole, machining and the like, and respectively carries out forced cooling on the parts with higher thermal load of the cylinder cover, thereby effectively improving the cooling effect of the cylinder sleeve, the cylinder cover and accessories of the cylinder cover, effectively reducing the local thermal deformation of the cylinder cover, causing cracks, poor sealing and the like, and prolonging the service life of the engine. Meanwhile, the service environment of the accessories of the combustion chamber can be improved, for example, the thermal fatigue safety coefficient of the valve and the valve seat ring can be increased, the valve abrasion is reduced, the thermal deformation of the cylinder sleeve is reduced, and the possibility of cylinder pulling is reduced. The invention takes the high-temperature cooling of the engine as an independent module to cool the cylinder sleeve and the cylinder cover with higher temperature, the cylinder sleeve of the cooling part is arranged outside, and a water channel is not arranged in the cylinder body, thereby greatly simplifying the structure of the engine body, and reducing the casting cost and the engine generation cost.
It is noted that, in the description of the present invention, the terms "first", "second", and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. An engine cooling system is characterized by comprising a cylinder cooling water channel arranged on a cylinder block and a cylinder cover cooling water channel arranged in a cylinder cover, wherein the cylinder cooling water channel is used for cooling a cylinder sleeve arranged above the cylinder block, the upper part of the cylinder sleeve is higher than the cylinder block by a certain distance, a cooling water jacket is sleeved on the periphery of the cylinder sleeve, the cooling water jacket is sleeved on the periphery of the cylinder sleeve higher than the cylinder block, a gap is formed between the cylinder sleeve and the cooling water jacket, and a first cooling water cavity for cooling the cylinder block is formed;
be equipped with the second cooling water cavity in the cylinder head, the second cooling water cavity includes upper water cavity and lower floor's water cavity, and the cooling water via cylinder body cooling water route gets into cylinder head cooling water route is right the cylinder head cools off, be equipped with different intercommunicating pores in the cylinder head, it is different the intercommunicating pore with upper water cavity and/or lower floor's water cavity intercommunication form two at least cylinder head cooling water routes, with right the different regions of cylinder head cool off.
2. The engine cooling system according to claim 1, wherein the at least two head-cooling water paths include a first cooling water path in which cooling water enters the lower-stage water chamber from the head-cooling water path and enters the upper-stage water chamber through a first cooling passage, and a second cooling water path in which cooling water enters the lower-stage water chamber from the head-cooling water path and enters the upper-stage water chamber through a second cooling passage; in the second cooling water channel, cooling water enters the upper water cavity from the cylinder body cooling water channel through a second cooling channel.
3. The engine cooling system according to claim 2, wherein the cylinder cooling water path and the lower water chamber in the first cooling water path communicate with each other through a first communication hole, one end of the first communication hole communicates with the cooling water jacket, and the other end of the first communication hole communicates with the lower water chamber.
4. The engine cooling system according to claim 3, characterized in that the first cooling passage includes a second communication hole provided between the lower water chamber and the upper water chamber and/or a third communication hole provided between the lower water chamber and a valve seat ring.
5. The engine cooling system according to claim 4, characterized in that the second cooling passage includes a fourth communication hole that is provided in a nose bridge region of the cylinder head and that communicates with the upper water chamber.
6. The engine cooling system according to claim 5, characterized in that the fourth communication hole includes a lateral through hole and an inclined through hole provided in a bottom plate of the cylinder head, one end of the lateral through hole communicates with the cooling water jacket, the other end of the lateral through hole communicates with one end of the inclined through hole, and the other end of the inclined through hole communicates with the upper water chamber.
7. The engine cooling system according to claim 5, characterized in that the second cooling passage further includes a fifth communication hole that communicates with the upper water chamber, one end of the fifth communication hole communicating with the cooling water jacket, and the other end of the fifth communication hole communicating with the upper water chamber.
8. The engine cooling system according to claim 1, characterized in that the communication hole is a machined through hole and/or a cast through hole.
9. An engine, characterized in that it comprises an engine cooling system according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628228.XA CN109854404B (en) | 2018-12-28 | 2018-12-28 | Engine cooling system and engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628228.XA CN109854404B (en) | 2018-12-28 | 2018-12-28 | Engine cooling system and engine |
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| CN109854404A CN109854404A (en) | 2019-06-07 |
| CN109854404B true CN109854404B (en) | 2020-06-26 |
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| CN201811628228.XA Active CN109854404B (en) | 2018-12-28 | 2018-12-28 | Engine cooling system and engine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273776A (en) * | 2019-07-02 | 2019-09-24 | 广西玉柴机器股份有限公司 | A kind of cooling cylinder head of layering |
| CN111058959B (en) * | 2019-12-30 | 2024-03-29 | 中国船舶集团有限公司第七一一研究所 | Cylinder cover and cylinder cover cooling water cavity structure thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005194967A (en) * | 2004-01-08 | 2005-07-21 | Toyota Motor Corp | Cooling structure for cylinder block |
| CN101699051A (en) * | 2009-10-30 | 2010-04-28 | 重庆长安汽车股份有限公司 | Air cylinder cover of miniature type engine precast with cooling water jacket |
| CN103266961B (en) * | 2013-05-27 | 2015-12-23 | 安徽江淮汽车股份有限公司 | A kind of engine cylinder cap |
| CN203906107U (en) * | 2014-05-07 | 2014-10-29 | 广西玉柴机器股份有限公司 | Combined type air cylinder cover and internal combustion engine body |
| CN105257421A (en) * | 2015-10-10 | 2016-01-20 | 天津大学 | Visual independent engine cylinder liner |
| CN207634197U (en) * | 2017-11-28 | 2018-07-20 | 东风商用车有限公司 | A kind of engine-cooling system |
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