CN101440753A - Method for reducing heat load and mechanical load of piston ring - Google Patents
Method for reducing heat load and mechanical load of piston ring Download PDFInfo
- Publication number
- CN101440753A CN101440753A CNA2007101900568A CN200710190056A CN101440753A CN 101440753 A CN101440753 A CN 101440753A CN A2007101900568 A CNA2007101900568 A CN A2007101900568A CN 200710190056 A CN200710190056 A CN 200710190056A CN 101440753 A CN101440753 A CN 101440753A
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- China
- Prior art keywords
- piston
- ring
- heat
- load
- gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a method for reducing heat load and mechanical load of a piston ring, which comprises the following steps: processing a ring-shaped step at the end faces of a piston and a cylinder sleeve respectively, and pressing a processed heat-resistant ring into the step at the end face of the cylinder sleeve in interference, wherein the relation among a height h (axis) of the step on the end face of the piston, a height h (hole) of the step on the end face of the cylinder sleeve and a gap a1 between the heat-resistant ring and an external circle of the step on the end face of the piston is as follows: the h (axis) is equal to the sum of the h (hole) and the a1, wherein a1 equals to a gap a2 between the cylinder sleeve and the piston. The method changes a straight way type of the gap at a matched part of a fire bank of the piston and the cylinder sleeve into a labyrinth type, prevents high-temperature and high-pressure fuel gas from directly impacting a first piston ring when the piston produces fuel gas explosion nearby an upper dead point, so as to reduce the heat load and the mechanical load of the piston ring, and improve service life of the piston ring and service performance of the engine.
Description
Technical field
The present invention relates to the assembling method of a kind of engine piston and cylinder liner, particularly reduce the method for piston ring heat load and mechanical load.
Background technique
Usually always leave the gap between engine piston and the cylinder liner, utilize the stop,threeway ring that is contained in piston head to seal.At present, lead directly between the firepower bank of piston (promptly the first road annular groove mouth is to the position of piston tip) and cylinder liner matching gap place and the engine chamber, the impact force of engine gas explosion time acts directly on the top piston ring with the impact heat load, cause first road ring institute's affected by hot loading and mechanism load too high, cause sting bad, stuck, even pull-cylinder phenomena, thereby shorten piston ring working life, influence the usability and the operating cost of motor.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and a kind of method that reduces piston ring heat load and mechanical load is provided, and adopts this method can increase piston ring working life, improves the motor usability, reduces operating cost.
Technological scheme of the present invention is: the end that is positioned at earlier the top-ring groove mouth outside on piston and cylinder liner processes circular step respectively, and the shoulder height h at piston end surface place
AxleShoulder height h greater than the cylinder liner end
The hole, the heat-retarding ring interference of being made by heat resisting alloy that will process then is pressed into cylinder liner end face step, and the exterior edge face flushes, and after being pressed into assembling, makes the gap a between the cylindrical at the endoporus of heat-retarding ring and piston end surface step place
1Equal the gap a between the cylinder and piston
2
Further scheme is: the shoulder height h at described piston end surface place
AxleEqual 3/5～4/5 of piston junk height, the piston junk height is meant the distance of the first road annular groove mouth to piston tip; The shoulder height h at described piston end surface place
AxleEqual the shoulder height h of cylinder liner end
The holeAdd the gap a between the cylindrical at heat-retarding ring endoporus and piston end surface step place
1, 0.05～0.10mm is got in this gap usually; Described heat resisting alloy adopts 4Cr9Si2.
Adopt above technological scheme, owing to be pressed into heat-retarding ring on the cylinder liner top, and guarantee the associated gap that heat-retarding ring cooperates with piston junk, make this gap become mazy type by traditional straight-through type, when avoiding piston to produce gas explosion near upper dead center, high-temperature high-pressure fuel gas directly impacts top piston ring, thereby reduce piston ring heat load and mechanical load greatly, increase piston ring working life, improve motor usability, reliability, reduce its operating cost.
Description of drawings
Accompanying drawing is for using assembly relation schematic representation of the present invention.
Embodiment
Referring to accompanying drawing, the end that is positioned at the notch outside of top piston ring 3 on piston 1 that designs in accordance with regulations and cylinder liner 2 processes circular step respectively, the heat-retarding ring 4 that processes is pressed into cylinder liner end face step, and the exterior edge face flushes, and the shoulder height h of piston end surface place
Axle, the cylinder liner end shoulder height h
The hole, heat-retarding ring endoporus and piston end surface step place cylindrical between gap a
1The triadic relation is: h
Axle=h
The hole+ a
1, a wherein
1Equal the gap a between the cylinder and piston
2, in this example, a
1=a
2=0.07mm, h
AxleEqual 4/5 firepower bank height, heat-retarding ring adopts the 4Cr9Si2 heat resisting alloy.
Claims (4)
1, a kind of method that reduces piston ring heat load and mechanical load is characterized in that the end that is positioned at the top-ring groove mouth outside on piston and cylinder liner processes circular step respectively, and the shoulder height h at piston end surface place
AxleShoulder height h greater than the cylinder liner end
The hole, the heat-retarding ring interference of being made by heat resisting alloy that will process then is pressed into cylinder liner end face step, and the exterior edge face flushes, and after being pressed into assembling, makes the gap a between the cylindrical at the endoporus of heat-retarding ring and piston end surface step place
1Equal the gap a between the cylinder and piston
2
2, by the method for claim 1 described reduction piston ring heat load and mechanical load, it is characterized in that: the shoulder height h at described piston end surface place
AxleEqual 3/5～4/5 of piston junk height.
3, by the method for claim 1 described reduction piston ring heat load and mechanical load, it is characterized in that: described h
Axle=h
The hole+ a
1
4, by the method for claim 1 described reduction piston ring heat load and mechanical load, it is characterized in that: described heat resisting alloy adopts 4Cr9Si2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101900568A CN101440753A (en) | 2007-11-20 | 2007-11-20 | Method for reducing heat load and mechanical load of piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101900568A CN101440753A (en) | 2007-11-20 | 2007-11-20 | Method for reducing heat load and mechanical load of piston ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101440753A true CN101440753A (en) | 2009-05-27 |
Family
ID=40725328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101900568A Pending CN101440753A (en) | 2007-11-20 | 2007-11-20 | Method for reducing heat load and mechanical load of piston ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101440753A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224110A (en) * | 2015-06-02 | 2016-12-14 | 卡特彼勒公司 | There is the cylinder buss assembly of thermal barrier coating |
-
2007
- 2007-11-20 CN CNA2007101900568A patent/CN101440753A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224110A (en) * | 2015-06-02 | 2016-12-14 | 卡特彼勒公司 | There is the cylinder buss assembly of thermal barrier coating |
| CN106224110B (en) * | 2015-06-02 | 2020-04-03 | 卡特彼勒公司 | Cylinder liner assembly with thermal barrier coating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090527 |