CN101929404A - Piston with steel top and aluminum skirt for 230SG type gas engine - Google Patents
Piston with steel top and aluminum skirt for 230SG type gas engine Download PDFInfo
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- CN101929404A CN101929404A CN2009101170564A CN200910117056A CN101929404A CN 101929404 A CN101929404 A CN 101929404A CN 2009101170564 A CN2009101170564 A CN 2009101170564A CN 200910117056 A CN200910117056 A CN 200910117056A CN 101929404 A CN101929404 A CN 101929404A
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- piston
- skirt body
- piston head
- skirt
- short column
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Abstract
The invention discloses a piston with a steel top and an aluminum skirt for a 230SG type gas engine. The piston comprises a steel piston top [2] and an aluminum skirt body [3] which is coaxially connected with the piston top [2] to form the piston, the upper end of the skirt body [3] is provided with a short column with the diameter smaller than the diameter of the skirt body [3], a connection end of the piston top [2] and the skirt body [3] is provided with an inner bore matched with the short column in diameter, the sleeved connection of the piton top [2] is realized through the matching of the inner bore and the short column, a sealing ring [4] is arranged between the short column and the inner bore, the piston top [2] is integrated with the skirt body [3] into a whole through the matching of a bolt [5] and a nut [7], the upper part of the piston top [2] is provided with a groove [8] sinking inwards, and the external circular face of the piston top [2] is provided with two gas ring grooves [9] and an oil ring groove [10]. The invention has long service life without power reduction.
Description
Technical field
The present invention relates to a kind of piston, especially a kind of piston of steel piston head aluminium matter skirt body.
Background technique
230SG gas engine piston was full aluminium integrated structure originally, piston head regional temperature height, the complete easy burning of aluminium piston head, fusing, annular groove part hardness is low, wears no resistance, and causes machine oil, combustion oil sintering easily, carbon distribution, like this will the accelerating piston ring and the wearing and tearing of piston ring groove, so this mechanism's piston is short working life, oil consumption is big.The material of full aluminium piston is a cast aluminium, and its linear expansion coeffcient is big, has just increased the gap between cylinder sleeve and the piston side, so can cause the impact of overlapping with countercylinder of rocking of piston, makes motor produce vibration and noise.
The 230SG gas engine requires power per cylinder 180Kw, rotating speed 1000rpm, and mean effective pressure 1.73Mpa, pressure of explosion 14Mpa moves 20,000 hours.Research data shows, mean effective pressure 1.8Mpa, and the reliability of aluminum piston will be lost.For improving diesel engine power, piston unit area power also improves thereupon, causes the increase of piston machine load and heat load, for satisfying this condition, requires piston that high heat-resisting degree is arranged, and the temperature difference of as far as possible dwindling the piston body inside and outside wall.The temperature of piston-top surface also will keep certain value, is beneficial to burning and reduces the end face carbon distribution.The weight of piston is light as far as possible, and has enough rigidity and intensity also should make piston ring groove that higher wear resistance is arranged, and the side clearance of piston is little, reduces the active force of countercylinder wall, reduces the consumption of machine oil, and therefore existing piston power is low, the problem that working life is short.
Summary of the invention
Purpose of the present invention solves the existing easy burning of 230SG gas engine piston exactly, and power is low, and rigidity is not enough, and the problem that linear expansion coeffcient is big provides a kind of piston of steel top aluminium apron.
The technical solution used in the present invention is; Steel crown and aluminum skirt piston, it is characterized in that piston head that it comprises steel with the aluminium matter skirt body of the coaxial formation piston that links to each other of piston head, skirt body upper end is provided with the short column of diameter less than skirt body diameter, piston head and skirt body connecting end are provided with and the suitable endoporus of short column diameter, piston head realizes that with the cooperation of short column suit is connected by endoporus, be provided with seal ring between short column and the endoporus, piston head and skirt body are one by being connected of bolts and nuts, the top of piston head is provided with inside concave groove, and the piston head periphery is provided with two compressions and an oil ring groove.
Adopt technique scheme, because piston and piston head are steel, therefore strengthened the intensity of piston greatly, because the piston head volume is little, the weight increase of whole piston is very little.The top of piston head is provided with inside concave groove, and its oily torch with the oil sprayer injection is matched, and helps organizing hot-fluid, increases the power of piston.Owing to the steel piston head, piston ring is difficult for wearing and tearing, piston long service life at oil ring groove and compression simultaneously.
For improving the running-in characteristic of piston and cylinder liner, the periphery of described skirt body scribbles molybdenum disulfide film.Because molybdenum disulfide has good wear resistance, therefore can improve the running-in characteristic of piston and cylinder liner.
For piston head can be cooled, described piston head is provided with several cooling chambers that is connected.Cold oil injects in the cooling chamber takes away heat, can make the piston head cooling.
In sum, beneficial effect of the present invention is: because piston head of the present invention adopts steel, therefore increased the intensity of piston greatly, increased the working life of piston greatly; Because the top is provided with inside concave groove, helps increasing the power of piston.Because piston head is provided with cooling chamber, so the piston head temperature can be not too high.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure, 1, pin, 2, piston head, 3, the skirt body, 4, seal ring, 5, bolt, 6, the elasticity cushion cover, 7, nut, 8, concave groove, 9, compression, 10, oil ring groove, 11, cooling chamber.
Embodiment
Steel crown and aluminum skirt piston of the present invention, as shown in Figure 1, the piston head 2 that it comprises steel with the aluminium matter skirt body 3 of the coaxial formation piston that links to each other of piston head, 42CrMoA alloy structure Buddha's warrior attendant is selected on piston 2 tops for use, skirt body 3 materials are 4A11 aluminium, this aluminium alloy wire expands less than cast aluminium, and the shaking amplitude of limited piston reduces the impact of countercylinder.Skirt body 3 upper ends are provided with the short column of diameter less than skirt body diameter, piston head 2 is provided with and the suitable endoporus of short column diameter with skirt body 3 connecting ends, piston head realizes that with the cooperation of short column suit is connected by endoporus, be provided with seal ring 4 between short column and the endoporus, piston head 2 is one with skirt body 3 by bolt 5 and being connected of nut 7, for convenient the flexible cushion cover 6 of bolt 5 overcoats is installed and dismounting.The top of piston head 2 is provided with inside concave groove 8, and piston head 2 peripheries are provided with two compressions 9 and an oil ring groove 10.The periphery of skirt body 3 scribbles molybdenum disulfide film.Piston head 2 is provided with several cooling chambers that is connected 11.Inject cold oil during use, take away heat, thereby reach the effect of cooling.
At work, the piston skirt body easy deformation of being heated, it is closely connected skirt section upper and lower end and cylinder sleeve to occur, the middle part bad connection, for solving this defective, the skirt section is designed to the middle-convex and varying ellipse profile, thereby has improved the operating conditions of piston.
Claims (3)
1.230 steel crown and aluminum skirt piston, it is characterized in that piston head [2] that it comprises steel with the aluminium matter skirt body [3] of the coaxial formation piston that links to each other of piston head [2], skirt body [3] upper end is provided with the short column of diameter less than skirt body diameter, piston head [2] is provided with and the suitable endoporus of short column diameter with skirt body [3] connecting end, piston head realizes that with the cooperation of short column suit is connected by endoporus, be provided with seal ring [4] between short column and the endoporus, piston head [2] is one with skirt body [3] by bolt [5] and being connected of nut [7], the top of piston head [2] is provided with inside concave groove [8], and piston head [2] periphery is provided with two compressions [9] and an oil ring groove [10].
2. piston according to claim 1 is characterized in that the periphery of described skirt body [3] scribbles molybdenum disulfide film.
3. aluminium skirt piston according to claim 1 and 2 is characterized in that described piston head is provided with several cooling chambers that is connected [11]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101170564A CN101929404A (en) | 2009-06-27 | 2009-06-27 | Piston with steel top and aluminum skirt for 230SG type gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101170564A CN101929404A (en) | 2009-06-27 | 2009-06-27 | Piston with steel top and aluminum skirt for 230SG type gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101929404A true CN101929404A (en) | 2010-12-29 |
Family
ID=43368774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101170564A Pending CN101929404A (en) | 2009-06-27 | 2009-06-27 | Piston with steel top and aluminum skirt for 230SG type gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101929404A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926886A (en) * | 2011-08-10 | 2013-02-13 | 中国兵器工业第五二研究所 | Steel crown aluminum piston and manufacturing method thereof |
| CN104179590A (en) * | 2014-06-30 | 2014-12-03 | 泰州市优力克机械制造有限公司 | Wear-resistant piston |
| CN111502856A (en) * | 2020-04-30 | 2020-08-07 | 上海建桥学院 | Diesel engine piston head and numerical control machining process thereof |
-
2009
- 2009-06-27 CN CN2009101170564A patent/CN101929404A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926886A (en) * | 2011-08-10 | 2013-02-13 | 中国兵器工业第五二研究所 | Steel crown aluminum piston and manufacturing method thereof |
| CN104179590A (en) * | 2014-06-30 | 2014-12-03 | 泰州市优力克机械制造有限公司 | Wear-resistant piston |
| CN111502856A (en) * | 2020-04-30 | 2020-08-07 | 上海建桥学院 | Diesel engine piston head and numerical control machining process thereof |
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Legal Events
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101229 |