CN112196689B - High-level salt core and piston - Google Patents
High-level salt core and piston Download PDFInfo
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- CN112196689B CN112196689B CN202011072952.6A CN202011072952A CN112196689B CN 112196689 B CN112196689 B CN 112196689B CN 202011072952 A CN202011072952 A CN 202011072952A CN 112196689 B CN112196689 B CN 112196689B
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- salt core
- line segment
- inner cooling
- cooling oil
- straight line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The high-level salt core is used as a core for forming an inner cooling oil passage of a piston, the cross section outline of the upper outer portion of the salt core is provided with a first straight line segment, the state of the salt core when the salt core is formed is referred, the side of a combustion chamber of the piston is taken as the upper side, the side of an axis of the piston is taken as the inner side, the first straight line segment is positioned on the upper outer side of the geometric center of the inner cooling oil passage, and the first straight line segment is inclined from bottom to top and from outside to inside. The upper outer side of the inner cooling oil duct is provided with a section of first straight line section which inclines inwards, so that the position with the minimum distance from the insert ring can move downwards, the inner cooling oil duct can be designed to be closer to the upper part, the whole inner cooling oil duct is closer to an annular groove, the cooling effect of the inner cooling oil duct on the annular groove is better, and the space between the upper outer side of the inner cooling oil duct and the insert ring is enlarged, so that the stress on the upper part of the inner cooling oil duct is favorably improved.
Description
Technical Field
The present disclosure relates to the field of vehicle accessories, and more particularly to a high salt core and a piston.
Background
Under the six-emission standard of China and the seven-emission standard of China in the future, in order to meet the performance requirements and simultaneously improve the fuel economy and reduce the carbon emission, the engine parameters are continuously improved, and the temperature of the engine is always increased.
Fig. 4 shows a conventional piston, in which the internal cooling gallery 7 is at a greater limit to the distance from the combustion chamber 8 and the insert ring 9.
Along with the improvement of engine parameters, the thermal efficiency of the engine is improved, the temperature of the piston is increased, however, the inner cooling oil channel 7 of the piston is too far away from the combustion chamber 8, the cooling effect is not ideal, and the temperature of the combustion chamber 8 of the piston and the temperature of one ring groove are higher. In the process of engine operation, there is the risk of piston combustion chamber fracture, or the risk of piston ring jamming and then drawing the jar that a ring groove carbon deposit is serious.
Disclosure of Invention
The present disclosure is made in view of the state of the art described above. The purpose of the present disclosure is to provide a high-level salt core and a piston, wherein an inner cooling oil passage of the piston is close to a ring groove, and a better cooling effect of the ring groove can be obtained.
The high-level salt core is used as a core for forming an inner cooling oil passage of a piston, the cross section outline of the upper outer portion of the salt core is provided with a first straight line segment, the state of the salt core when the salt core is formed is referred, the side of a combustion chamber of the piston is taken as the upper side, the side of an axis of the piston is taken as the inner side, the first straight line segment is positioned on the upper outer side of the geometric center of the inner cooling oil passage, and the first straight line segment is inclined from bottom to top and from outside to inside.
Preferably, the first straight line segment extends from substantially the middle to the top of the salt core in the height direction, the cross-sectional profile of the upper part of the salt core has an upper arc segment connecting the first straight line segment and extending to the inner side of the salt core, the height of the salt core is h, the radius of the upper arc segment is r1, r1>0.2h, wherein the upper arc segment is an arc segment, or the upper arc segment comprises a plurality of arc segments and straight segments.
Preferably, the height of the salt core is h, the width of the salt core is b, and b/h is more than or equal to 0.52.
Preferably, the first straight line segment forms an acute angle a, a >10 ° with the height direction of the salt core.
Preferably, the cross-sectional profile of the lower outer portion of the salt core has an outer arc segment located entirely below and outside the geometric center of the inner cooling gallery, the salt core has a height h, the outer arc segment has a radius r4, r4>0.2h, and/or
The cross section contour of the lower inner part of the salt core is provided with an inner arc line section, the inner arc line section is integrally positioned on the lower inner side of the geometric center of the inner cooling oil channel, the height of the salt core is h, the radius of the inner arc line section is r3, and r3 is more than 0.2 h.
Preferably, the first straight segment and the upper arc segment are manufactured by turning the preformed salt core.
The piston comprises an inner cooling oil channel, wherein the inner cooling oil channel is made by taking the high-level salt core as a core, and the first straight line segment is used for forming the upper outer part of the inner cooling oil channel.
Preferably, the piston comprises an insert ring arranged in a ring groove, and the inner cooling oil passage is higher than the lower end surface of the insert ring.
Preferably, the distance between the insert ring and the inner cooling oil passage is w1, w1<4mm, and/or the distance between the bottom of the combustion chamber and the inner cooling oil passage is w2, w2<6.8 mm.
Preferably, in an axial cross section of the piston, the inner cooling oil passage is substantially elliptical, and/or
The oval shape assumes an inclined posture extending toward the inside while extending toward the upper side.
The technical scheme provided by the disclosure at least has the following beneficial effects:
the upper outer side of the inner cooling oil duct is provided with a section of first straight line section which inclines inwards, so that the position with the minimum distance from the insert ring can move downwards, the inner cooling oil duct can be designed to be closer to the upper part, the whole inner cooling oil duct is closer to an annular groove, the cooling effect of the inner cooling oil duct on the annular groove is better, and the space between the upper outer side of the inner cooling oil duct and the insert ring is enlarged, so that the stress on the upper part of the inner cooling oil duct is favorably improved.
Drawings
Fig. 1 is a partial cross-sectional view of a piston provided by the present disclosure.
Fig. 2 is a first enlarged view of the vicinity of the inner cooling gallery of the piston in fig. 1.
Fig. 3 is a second enlarged view of the vicinity of the inner cooling gallery of the piston of fig. 1.
Fig. 4 is an enlarged view of the vicinity of the inner cooling gallery of the conventional piston.
Description of reference numerals:
1 inner cooling oil duct, 2 insert ring, 3 a ring groove, 4 combustion chamber, 41 combustion chamber bottom, 42 combustion chamber throat, 51 first straight line segment, 52 second straight line segment, 53 third straight line segment, 61 upper arc segment, 62 outer arc segment and 63 inner arc segment;
7 inner cooling oil passages, 8 combustion chambers and 9 inlaid rings.
Detailed Description
Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the disclosure, and is not intended to be exhaustive or to limit the scope of the disclosure.
The present disclosure provides a high-level salt core and a piston, the high-level salt core is used as a core of an inner cooling oil passage 1 of the piston, so that the shape of the cross section of the inner cooling oil passage 1 is the same as the shape of the cross section profile of the salt core. The salt core and the inner cooling oil duct 1 are integrally annular, and the cross section refers to the cross section of the salt core and the inner cooling oil duct 1 which is cut along the axial direction.
The following description of the cross-sectional shape of the internal cooling oil passage 1 is also applicable to the cross-sectional profile shape of the high-level salt core.
As shown in fig. 1, the piston has a combustion chamber 4, an inner cooling oil passage 1, and an insert ring 2 for forming a ring groove 3, oil can flow through the inner cooling oil passage 1 and oscillate therein to take away heat of the combustion chamber 4 and the ring groove 3, and the inner cooling oil passage 1 plays a role of cooling the ring groove 3 and the combustion chamber 4.
It should be understood that "inner" as used herein refers to the side radially closer to the axis of the piston and "outer" refers to the side radially further from the axis of the piston. The term "upper" as used herein refers to a side axially close to the end of the piston where the combustion chamber 4 is located, and "lower" refers to a side axially away from the end of the piston where the combustion chamber 4 is located.
As used herein, "radial" is the radial direction of the piston and "axial" is the axial direction of the piston.
The upper part, the lower part, the inner part and the outer part of the salt core correspond to the upper part, the lower part, the inner part and the outer part of the inner cooling oil duct 1 one by one.
The inner-cooling oil passage 1 has an ellipse-like shape (substantially elliptical shape) in which the width of the upper portion of the ellipse is greater than or equal to the width of the lower portion of the ellipse, and/or the ellipse assumes an inclined posture that extends toward the inside while extending toward the upper side. Thus, the internal cooling oil passage 1 can cool a ring groove and a combustion chamber (combustion chamber throat) at the same time.
The axial maximum dimension of the cross section of the inner cooling oil passage 1 is referred to as the height of the inner cooling oil passage 1, and the radial maximum dimension of the cross section of the inner cooling oil passage 1 is referred to as the width of the inner cooling oil passage 1.
The salt core is substantially circular, the cross section (axial section) of the salt core having an ellipse-like shape. When the internal cooling oil duct 1 is formed, the first direction of the salt core is located in the axial direction of the internal cooling oil duct 1, the second direction of the salt core is located in the radial direction of the internal cooling oil duct 1, and the first direction is perpendicular to the second direction. The largest dimension of the cross-sectional profile of the salt core in the first direction is referred to as the height of the salt core and the largest dimension of the cross-sectional profile of the salt core in the second direction is referred to as the width of the salt core.
As shown in fig. 2 and 3, the inner cooling oil passage 1 is located between the combustion chamber 4 and the one ring groove 3 in the radial direction of the piston, and the inner cooling oil passage 1 has an inner side portion close to the combustion chamber 4 and an outer side portion close to the one ring groove 3.
The cross section of the upper outer portion of the inner cooling oil passage 1 has a first straight line segment 51, the first straight line segment 51 may be located on the upper outer side of the geometric center of the inner cooling oil passage 1, and the first straight line segment 51 is inclined from bottom to top and from outside to inside. The top end of the inner cooling gallery 1 may be higher than the lower end face of the insert ring 2, and in particular, substantially flush with the upper end face of the insert ring 2 (may also be higher than the upper end face of the insert ring 2).
The first straight line segment 51 forms an acute angle a, a >10 ° with the height direction of the internal cooling oil passage 1, i.e., the axial direction of the piston.
Therefore, the first straight line section 51 with the inner inclination is arranged on the upper outer portion of the inner cooling oil duct 1 and moves downwards from the position with the minimum distance with the insert ring 2, so that the inner cooling oil duct 1 can be designed to be closer to the upper portion, the whole inner cooling oil duct 1 is closer to the annular groove 3, the cooling effect of the inner cooling oil duct 1 on the annular groove 3 is better, and the space of a piston between the upper outer side of the inner cooling oil duct 1 and the insert ring 2 is enlarged, and the stress on the upper portion of the inner cooling oil duct 1 is improved.
The upper outer portion of the salt core has a first straight section for forming the first straight section 51 described above.
The upper portion of the inner cooling oil channel 1 may have an upper arc segment 61 in cross section, the upper arc segment 61 being connected to the first straight segment 51 and extending up to the inner side portion of the inner cooling oil channel 1. For example, one end of the first straight line segment 51 is located on the upper outer side of the geometric center of the inner cooling oil passage 1, and the other end is located on the upper inner side of the geometric center of the inner cooling oil passage 1. The first straight line segment 51 is tangent to the upper arc segment 61. The upper arc segment 61 may be an arc segment, or may include a plurality of arc segments and straight segments.
The height of the inner cooling oil passage 1 is h, the radius of the upper arc line section 61 is r1, and r1 is more than 0.2 h. In the case where the upper arc segment 61 includes a plurality of arc segments, "the radius of the upper arc segment 61 is r1, r1>0.2 h" may be understood as the radius of at least one of the plurality of arc segments of the upper arc segment 61 is r1, r1>0.2 h. The cross section of the lower outer portion of the inner cooling oil passage 1 may have an outer arc segment 62, and the cross section of the lower inner portion of the inner cooling oil passage 1 may have an inner arc segment 63. The outer arc segment 62 is located entirely below and outside the geometric center of the inner cooling oil passage 1, and the inner arc segment 63 is located entirely below and inside the geometric center of the inner cooling oil passage 1. The radius of the outer arc line segment 62 is r4, the radius of the inner arc line segment 63 is r3, r4>0.2h, and r3>0.2 h.
The upper arc line section 61, the outer arc line section 62 and the inner arc line section 63 are large, so that the inner cooling oil duct 1 is not easy to generate stress concentration under high detonation pressure, and the cracking risk of the inner cooling oil duct 1 is low.
The upper end of the salt core has an upper arc segment for forming the upper arc segment 61 described above.
For the salt core, the first straight line segment 51 and the upper arc segment 61 are manufactured by turning the preform product.
The width of the inner cooling oil channel 1 is b, and b/h is more than or equal to 0.52, so that the reliability of the salt core under high explosion pressure and high power can be improved.
The relationship between the width and the height of the salt core meets the relationship between the width and the height of the inner cooling oil channel 1.
Second straight segment 52 may be formed between upper arc segment 61 and inner arc segment 63, second straight segment 52 may be tangent to inner arc segment 63, and second straight segment 52 may be connected to upper arc segment 61 via a circular arc (a circular arc tangent to upper arc segment 61 and second straight segment 52). The second straight line segment 52 is inclined from the outside to the inside and from the bottom to the top.
Between the first straight line segment 51 and the outer arc segment 62 there may be a third straight line segment 53, the third straight line segment 53 being tangent to the outer arc segment 62, the third straight line segment 53 being connectable to the first straight line segment 51 via a circular arc (a circular arc tangent to the first straight line segment 51 and the third straight line segment 53). Here, an arc segment between the first straight segment 51 and the third straight segment 53 may be formed by turning. The third straight line segment 53 is inclined from inside to outside, from bottom to top.
The second straight section 52 and the third straight section 53 are used to achieve demoulding of the salt core.
The second straight line section 52 and the third straight line section 53 are in smooth transition with the upper arc line section 61 and the first straight line section 51 through arcs respectively, and the outline shape of the inner cooling oil channel 1 is optimized.
The distance w1 between the inner cooling oil passage 1 and the insert 2 can be less than 4mm, and the distance w2 between the inner cooling oil passage 1 and the bottom 41 of the combustion chamber can be less than 6.8 mm.
The inner cooling oil duct 1 is closer to the insert ring 2, so that the temperature of the ring groove 3 can be effectively reduced, the generation of carbon deposition in the ring groove 3 is reduced, the phenomenon that one ring of carbon deposition is accumulated to cause clamping stagnation is avoided, and the problems of abnormal rise of oil consumption and air leakage, abrasion of the clamped ring to a cylinder sleeve and the like can be solved.
The inner cooling oil passage is closer to the combustion chamber 4, so that the temperature of the combustion chamber 4 (mainly the temperature of the throat 42 of the combustion chamber) can be reduced, the problems of temperature rise in a cylinder and cracking of the throat 42 of the combustion chamber caused by the rise of engine parameters are solved, the piston has a longer life cycle, and can well cope with the high power and high detonation pressure of the current six types of the piston in China.
It should be understood that the above-described embodiments are exemplary only, and are not intended to limit the present disclosure. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of this disclosure, without departing from the scope of this disclosure.
Claims (9)
1. A high-level salt core used as a core for forming an inner cooling oil passage (1) of a piston is characterized in that the cross-sectional profile of the upper outer portion of the salt core is provided with a first straight line segment (51), the cross-sectional profile of the lower outer portion of the salt core is provided with an outer arc line segment (62), a third straight line segment (53) is arranged between the first straight line segment (51) and the outer arc line segment (62), the third straight line segment (53) is tangent to the outer arc line segment (62), the third straight line segment (53) is connected to the first straight line segment (51) in a tangent mode through an arc, the salt core is in a state when the inner cooling oil passage (1) is formed, the side where a combustion chamber (4) of the piston is located is an upper side, the side where the axis of the piston is located is an inner side, and the first straight line segment (51) is located on the upper outer side of the geometric center of the inner cooling oil passage (1), the first straight line segment (51) inclines from bottom to top and from outside to inside and extends from the middle part to the top of the salt core in the height direction, the third straight line segment (53) inclines from inside to outside and from bottom to top, and the first straight line segment (51) and the salt core in the height direction form an acute angle a, a being larger than 10 degrees.
2. An elevated salt core according to claim 1 wherein the cross-sectional profile of the upper part of the salt core has an upper arc segment (61), the upper arc segment (61) connecting the first straight segment (51) and extending to the inner side of the salt core, the height of the salt core is h, the radius of the upper arc segment (61) is r1, r1>0.2h,
the upper arc line segment is an arc line segment, or the upper arc line segment comprises a plurality of arc line segments and straight line segments.
3. The high-level salt core of claim 1, wherein the height of the salt core is h, the width of the salt core is b, and b/h is greater than or equal to 0.52.
4. The high salt core of claim 1,
the outer arc line segment (62) is integrally positioned at the lower outer side of the geometric center of the inner cooling oil channel (1), the height of the salt core is h, the radius of the outer arc line segment (62) is r4, r4 is more than 0.2h, and/or
The cross-sectional profile of the lower inner part of the salt core is provided with an inner arc line section (63), the inner arc line section (63) is integrally positioned on the lower inner side of the geometric center of the inner cooling oil channel (1), the height of the salt core is h, and the radius of the inner arc line section (63) is r3, and r3 is more than 0.2 h.
5. High-level salt core according to claim 2, characterized in that the first straight line segment (51) and the upper arc segment (61) are manufactured by turning the preformed salt core.
6. Piston comprising an inner cooling gallery (1), characterized in that the inner cooling gallery (1) is made with a high salt core according to any one of claims 1 to 5 as a core, the first straight section (51) being intended to form the upper outer portion of the inner cooling gallery (1).
7. The piston according to claim 6, characterized in that the piston comprises an insert ring (2) arranged in a ring groove, and the inner cooling gallery (1) is higher than the lower end surface of the insert ring (2).
8. Piston according to claim 7, characterized in that the distance of the insert ring (2) from the inner cooling gallery (1) is w1, w1<4mm, and/or
The distance between the bottom of the combustion chamber (4) and the inner cooling oil channel (1) is w2, and w2 is less than 6.8 mm.
9. Piston according to claim 6, characterized in that the inner cooling gallery (1) is substantially oval in axial cross-section of the piston and/or
The oval shape assumes an inclined posture extending toward the inside while extending toward the upper side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072952.6A CN112196689B (en) | 2020-10-09 | 2020-10-09 | High-level salt core and piston |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072952.6A CN112196689B (en) | 2020-10-09 | 2020-10-09 | High-level salt core and piston |
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| Publication Number | Publication Date |
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| CN112196689A CN112196689A (en) | 2021-01-08 |
| CN112196689B true CN112196689B (en) | 2021-09-21 |
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| CN202011072952.6A Active CN112196689B (en) | 2020-10-09 | 2020-10-09 | High-level salt core and piston |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006024098A1 (en) * | 2006-05-23 | 2007-12-20 | Ks Kolbenschmidt Gmbh | Piston for internal combustion engine has cooling channel enclosing access channel narrowing in cross-section towards piston floor, inclined to annular field, leading directly or indirectly to annular support |
| DE102008028197A1 (en) * | 2008-06-12 | 2009-12-17 | Mahle International Gmbh | Piston e.g. single-part cast piston, for internal combustion engine, has cooling channel running around piston crown at height of ring part, where surface of cooling channel includes circulating grooves that run parallel to each other |
| CN104379917A (en) * | 2012-05-05 | 2015-02-25 | 马勒国际公司 | Piston for an internal combustion engine |
| CN104641094A (en) * | 2012-08-31 | 2015-05-20 | 马勒国际公司 | Piston for an internal combustion engine |
| CN206468454U (en) * | 2017-01-06 | 2017-09-05 | 潍柴动力股份有限公司 | A kind of natural gas engine and its piston |
| CN107923299A (en) * | 2015-07-30 | 2018-04-17 | 马勒国际有限公司 | Piston for internal combustion engine |
-
2020
- 2020-10-09 CN CN202011072952.6A patent/CN112196689B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006024098A1 (en) * | 2006-05-23 | 2007-12-20 | Ks Kolbenschmidt Gmbh | Piston for internal combustion engine has cooling channel enclosing access channel narrowing in cross-section towards piston floor, inclined to annular field, leading directly or indirectly to annular support |
| DE102008028197A1 (en) * | 2008-06-12 | 2009-12-17 | Mahle International Gmbh | Piston e.g. single-part cast piston, for internal combustion engine, has cooling channel running around piston crown at height of ring part, where surface of cooling channel includes circulating grooves that run parallel to each other |
| CN104379917A (en) * | 2012-05-05 | 2015-02-25 | 马勒国际公司 | Piston for an internal combustion engine |
| CN104641094A (en) * | 2012-08-31 | 2015-05-20 | 马勒国际公司 | Piston for an internal combustion engine |
| CN107923299A (en) * | 2015-07-30 | 2018-04-17 | 马勒国际有限公司 | Piston for internal combustion engine |
| CN206468454U (en) * | 2017-01-06 | 2017-09-05 | 潍柴动力股份有限公司 | A kind of natural gas engine and its piston |
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| CN112196689A (en) | 2021-01-08 |
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