CN112664343A - Layered cooling water jacket structure of engine - Google Patents
Layered cooling water jacket structure of engine Download PDFInfo
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- CN112664343A CN112664343A CN202011541782.1A CN202011541782A CN112664343A CN 112664343 A CN112664343 A CN 112664343A CN 202011541782 A CN202011541782 A CN 202011541782A CN 112664343 A CN112664343 A CN 112664343A
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Abstract
The invention relates to a layered cooling water jacket structure of an engine, and belongs to the technical field of engines. The method mainly comprises the following steps: cylinder block, cylinder jacket, outer water jacket, inlayer water jacket, water inlet, delivery port, through-hole, sealing washer. The outer water jacket is arranged in the cylinder body, the outer diameter of the middle lower area in the axial direction of the cylinder sleeve is smaller than that of other areas, the cylinder sleeve and the cylinder body are in interference fit and then form the inner water jacket in the area with the smaller outer diameter, and the inner water jacket is communicated with the outer water jacket through the through hole. The lower region in the axial direction of the cylinder sleeve is in contact with the cooling liquid of the inner water jacket, the heat exchange coefficient is small, and the structural temperature of the cylinder sleeve in the region is improved, so that the axial temperature gradient of the cylinder sleeve is reduced, and the friction loss of a piston ring is reduced.
Description
Technical Field
The invention relates to a layered cooling water jacket structure of an engine, and belongs to the technical field of engines.
Background
The cylinder sleeve-piston ring friction pair is the most important friction pair in the engine, and the friction loss of the cylinder sleeve-piston ring friction pair accounts for about 30% of the mechanical loss of the engine, so that the reduction of the friction loss of the cylinder sleeve-piston ring friction pair is very important for improving the mechanical efficiency of the engine. In fact, the axial temperature distribution of the cylinder liner directly affects the lubrication friction condition between the piston ring and the cylinder liner. When the piston moves to the position near the upper dead point, the back pressure of the piston ring is higher, the movement speed of the piston is lower, and the temperature of the contact position of the cylinder sleeve and the piston ring is expected to be controlled at a lower level, so that the lubricating oil has higher viscosity and stronger film forming capability, and the contact friction of a microprotrusion body is reduced; the speed is higher when the piston moves to the middle section of the stroke, and the temperature of the contact position of the cylinder sleeve and the piston ring is expected to be controlled at a higher level, so that the viscosity of lubricating oil is lower, the shearing friction of fluid is reduced, and the circulating friction work is reduced. However, in practice, the temperature of the engine cylinder liner is higher in the area close to the top dead center, lower in the area far away from the top dead center, and large in axial temperature gradient. If the temperature gradient in the axial direction of the cylinder liner can be reduced, the friction loss of the piston ring can be reduced.
Disclosure of Invention
The invention aims to reduce the axial temperature gradient of a cylinder sleeve when an engine works, improve the lubricating state of a piston ring and the cylinder sleeve and reduce the friction loss of the piston ring, thereby providing a layered cooling water jacket structure of the engine.
The purpose of the invention is realized by the following technical scheme.
The invention relates to a layered cooling water jacket structure of an engine, which mainly comprises: cylinder block, cylinder jacket, outer water jacket, inlayer water jacket, water inlet, delivery port, through-hole, sealing washer.
The outer water jacket is arranged in the cylinder body; the lower side and the upper side of the inner wall of the outer water jacket are respectively provided with a water inlet and a water outlet.
The outer diameter of the middle lower area in the axial direction of the cylinder sleeve is smaller than that of other areas, and the cylinder sleeve and the cylinder block are subjected to interference assembly and then form an inner water jacket in the area with the smaller outer diameter;
a plurality of through holes are formed in the circumferential direction on the upper edge and the lower edge of the contact area of the cylinder body and the inner water jacket, and the inner water jacket is communicated with the outer water jacket through the through holes;
the lower part of the outer side wall surface of the cylinder sleeve is provided with a groove, and a sealing ring is arranged in the groove to prevent the leakage of the cooling liquid.
The working process is as follows:
in the running process of the engine, cooling liquid enters the outer water jacket from the water inlet, cools the structure and then flows out from the water outlet. And a part of cooling liquid flows into the inner-layer water jacket from the through hole, exchanges heat with the cylinder sleeve and then flows back to the outer-layer water jacket. Due to the throttling effect of the through holes, the flow speed of the cooling liquid in the inner water jacket is lower than that of the outer water jacket, so that the heat exchange coefficient between the cooling liquid in the inner water jacket and the wall surface of the structure is smaller compared with that of the outer water jacket. The middle and lower area of the cylinder sleeve in the axial direction is in contact with the inner water jacket cooling liquid, the heat exchange coefficient is small, the structural temperature of the cylinder sleeve in the area is improved, and the temperature difference value with the upper area structure of the cylinder sleeve is reduced, so that the axial temperature gradient of the cylinder sleeve is reduced, and the friction loss of a piston ring is reduced.
When the structural parameters are designed, the more the number of the through holes is, the larger the inner diameter is, the higher the flow velocity of the cooling liquid of the inner layer water jacket is, the flow velocity of the cooling liquid of the inner layer water jacket can be changed by changing the number and the inner diameter of the through holes, and the purpose of adjusting the temperature distribution of the cylinder sleeve is achieved.
Has the advantages that:
1. the layered cooling water jacket structure of the engine reduces the axial temperature gradient of the cylinder sleeve and reduces the friction loss of the piston ring.
2. According to the layered cooling water jacket structure of the engine, the inner water jacket is formed by interference assembly of the cylinder sleeve and the cylinder body, the manufacturing and the processing are simple and convenient, the manufacturing cost is low, and standardization and commercialization are convenient to realize.
Drawings
FIG. 1 is a cross-sectional view of an engine layered cooling water jacket structure of the present invention;
the cylinder comprises a cylinder body 1, a cylinder sleeve 2, an outer water jacket 3, an inner water jacket 4, a water inlet 5, a water outlet 6, a through hole 7 and a sealing ring 8.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example 1
The invention relates to a layered cooling water jacket structure of an engine, which mainly comprises: the cylinder body 1, the cylinder jacket 2, the outer water jacket 3, the inner water jacket 4, the water inlet 5, the water outlet 6, the through hole 7 and the sealing ring 8.
The outer water jacket 3 is arranged in the cylinder body 1; the lower side and the upper side of the inner wall of the outer water jacket 3 are respectively provided with a water inlet 5 and a water outlet 6.
The outer diameter of the middle lower area in the axial direction of the cylinder sleeve 2 is smaller than that of other areas, and an inner water jacket 4 is enclosed in the area with the smaller outer diameter after the cylinder sleeve 2 and the cylinder block 1 are in interference fit;
a plurality of through holes 7 are circumferentially arranged on the upper edge and the lower edge of the contact area of the cylinder block 1 and the inner water jacket 4, and the inner water jacket 4 is communicated with the outer water jacket 3 through the through holes 7;
the lower part of the outer side wall surface of the cylinder sleeve 2 is provided with a groove, and a sealing ring 8 is arranged in the groove to prevent the leakage of the cooling liquid.
The working process is as follows:
in the running process of the engine, cooling liquid enters the outer water jacket 3 from the water inlet 5, cools the structure and then flows out from the water outlet 6. Part of the cooling liquid flows into the inner water jacket 4 from the through holes 7, exchanges heat with the cylinder liner 2 and then flows back to the outer water jacket 3. Due to the throttling effect of the through holes 7, the flow speed of the cooling liquid in the inner water jacket 4 is lower than that of the outer water jacket 3, so that the heat exchange coefficient between the cooling liquid in the inner water jacket 4 and the wall surface of the structure is smaller compared with that of the outer water jacket 3. The lower region in the cylinder liner 2 axial direction contacts with the coolant of the inner water jacket 4, the heat exchange coefficient is smaller, the structure temperature of the cylinder liner 2 in the region is improved, and the temperature difference with the structure of the upper region of the cylinder liner 2 is reduced, so that the axial temperature gradient of the cylinder liner 2 is reduced, and the friction loss of a piston ring is reduced.
When the structural parameters are designed, the more the number of the through holes 7 is, the larger the inner diameter is, the higher the flow rate of the cooling liquid of the inner layer water jacket 4 is, the flow rate of the cooling liquid of the inner layer water jacket 4 can be changed by changing the number and the inner diameter of the through holes 7, and the purpose of adjusting the temperature distribution of the cylinder sleeve 2 is achieved.
Claims (3)
1. A layered cooling water jacket structure of an engine mainly comprises: cylinder block, cylinder jacket, outer water jacket, inlayer water jacket, water inlet, delivery port, through-hole, sealing washer.
The outer water jacket is arranged in the cylinder body; the lower side and the upper side of the inner wall of the outer water jacket are respectively provided with a water inlet and a water outlet;
the outer diameter of the middle lower area in the axial direction of the cylinder sleeve is smaller than that of other areas, and the cylinder sleeve and the cylinder block are subjected to interference assembly and then form an inner water jacket in the area with the smaller outer diameter;
the upper edge and the lower edge of the contact area of the cylinder body and the inner water jacket are circumferentially provided with a plurality of through holes, and the inner water jacket is communicated with the outer water jacket through the through holes.
2. The layered cooling water jacket structure for an engine according to claim 1, wherein: the lower part of the outer side wall surface of the cylinder sleeve is provided with a groove, and a sealing ring is arranged in the groove.
3. The layered cooling water jacket structure for an engine according to claim 1, wherein: the more the number of the through holes is, the larger the inner diameter is, the higher the flow rate of the cooling liquid of the inner-layer water jacket is, and the flow rate of the cooling liquid of the inner-layer water jacket can be changed by changing the number and the inner diameter of the through holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011541782.1A CN112664343A (en) | 2020-12-23 | 2020-12-23 | Layered cooling water jacket structure of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011541782.1A CN112664343A (en) | 2020-12-23 | 2020-12-23 | Layered cooling water jacket structure of engine |
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| Publication Number | Publication Date |
|---|---|
| CN112664343A true CN112664343A (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011541782.1A Pending CN112664343A (en) | 2020-12-23 | 2020-12-23 | Layered cooling water jacket structure of engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278450A (en) * | 2021-11-01 | 2022-04-05 | 中国船舶重工集团公司第七一一研究所 | Cylinder jacket assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074409A (en) * | 2001-09-05 | 2003-03-12 | Yanmar Co Ltd | Cylinder liner structure of internal combustion engine |
| US20050257756A1 (en) * | 2004-05-24 | 2005-11-24 | Honda Motor Co., Ltd. | Cylinder liner cooling structure |
| CN102536494A (en) * | 2012-03-22 | 2012-07-04 | 江苏四达动力机械集团有限公司 | Cooling water jacket structure of diesel engine cylinder body |
| CN204646439U (en) * | 2015-04-09 | 2015-09-16 | 重庆科克发动机技术有限公司 | The double-deck cooling water jacket structure of V-type engine cylinder body |
| CN106050460A (en) * | 2016-08-03 | 2016-10-26 | 扬州神驰缸套有限公司 | Wet cylinder jacket |
| CN111894755A (en) * | 2020-07-20 | 2020-11-06 | 东风商用车有限公司 | Cooling device of double-layer homodromous flow type diesel engine |
-
2020
- 2020-12-23 CN CN202011541782.1A patent/CN112664343A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074409A (en) * | 2001-09-05 | 2003-03-12 | Yanmar Co Ltd | Cylinder liner structure of internal combustion engine |
| US20050257756A1 (en) * | 2004-05-24 | 2005-11-24 | Honda Motor Co., Ltd. | Cylinder liner cooling structure |
| CN102536494A (en) * | 2012-03-22 | 2012-07-04 | 江苏四达动力机械集团有限公司 | Cooling water jacket structure of diesel engine cylinder body |
| CN204646439U (en) * | 2015-04-09 | 2015-09-16 | 重庆科克发动机技术有限公司 | The double-deck cooling water jacket structure of V-type engine cylinder body |
| CN106050460A (en) * | 2016-08-03 | 2016-10-26 | 扬州神驰缸套有限公司 | Wet cylinder jacket |
| CN111894755A (en) * | 2020-07-20 | 2020-11-06 | 东风商用车有限公司 | Cooling device of double-layer homodromous flow type diesel engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278450A (en) * | 2021-11-01 | 2022-04-05 | 中国船舶重工集团公司第七一一研究所 | Cylinder jacket assembly |
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Application publication date: 20210416 |
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