EP0327595A1 - Einteiliger, leichter und reibungsarmer leichtmetallkolben für verbrennungsmotoren. - Google Patents
Einteiliger, leichter und reibungsarmer leichtmetallkolben für verbrennungsmotoren.Info
- Publication number
- EP0327595A1 EP0327595A1 EP88900342A EP88900342A EP0327595A1 EP 0327595 A1 EP0327595 A1 EP 0327595A1 EP 88900342 A EP88900342 A EP 88900342A EP 88900342 A EP88900342 A EP 88900342A EP 0327595 A1 EP0327595 A1 EP 0327595A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- shaft
- equal
- piston according
- pressure
- 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.)
- Granted
Links
Classifications
-
- 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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
- F02F3/04—Pistons having means for accommodating or controlling heat expansion having expansion-controlling inserts
- F02F3/08—Pistons having means for accommodating or controlling heat expansion having expansion-controlling inserts the inserts being ring-shaped
-
- 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
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
-
- 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
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0448—Steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/04—Thermal properties
- F05C2251/042—Expansivity
Definitions
- the invention relates to a light metal piston according to the preamble of patent claim 1.
- the invention is based on the object of significantly reducing the running noise in the aforementioned known light and low-friction pistons, each with extremely short shaft lengths, particularly in the start-up and part-load range.
- the ring inserts in the piston head proposed in claims 19-22 differ from similar inserts described in EP-A 0 210 649 in particular in that they do not lie in the top land area above the ring grooves, as in that prior art, but rather are arranged exclusively in the area radially within the ring grooves. As a result, they can act directly on the area of the ring webs on which the tightest possible running play should be predeterminable even in the cold state by restricting the thermal expansion.
- Fig. 1 shows a piston in a longitudinal half in section along the line I - I and in the other half in the direction of the arrows I - I
- Fig. 2 shows a section through the piston along line II - II
- Fig. 3 shows the piston in a longitudinal half in section along line III - III and in the other half in the direction of arrows III - III
- Fig. 4 shows the cold play S between the outer shape of the piston and the cylinder surface in the pressure-counter pressure direction DR-GDR and in the pin direction BR
- Fig. 7 shows a longitudinal section through another
- Fig. 8a, b shows a longitudinal section through two alternative piston designs with a u initially divided
- FIG. 10 shows a section through the piston skirt along line X-X in FIG. 8
- the piston consists of an aluminum-silicon alloy.
- ring grooves 2 and 3 are provided for compression rings and a ring groove 4 underneath for receiving an oil scraper.
- A average shaft height below the lowest ring groove in a circumferential area with approximately the same shaft height of at least 45 degrees on each of the two bearing sides of the piston (circumferential area between the piston hubs 6)
- T diametrical mutual distance between the radially outer hub bore ends
- the ring webs between the piston ring grooves 2, 3, 4 and the shaft region F in the case of a piston which is warm from the engine have approximately the same running play with respect to the cylinder track.
- the piston slides simultaneously in the area F and on the first and second ring webs on the cylinder track, ie the piston receives its guidance in these areas.
- This piston guide which takes place in two axially separated areas, is extremely important for a low-noise piston run. Because in order to achieve low-noise running, the piston must be in an axially sufficiently high hen area be guided so that a piston tilt triggered by the connecting rod deflection can be largely avoided. In the case of flat pistons with correspondingly low stem heights, this requirement usually presents an unsolvable problem.
- the invention remedies that the ring webs are used to guide the piston. This is done in that, in contrast to the previously known prior art, the cold play there is designed so that the warm play there corresponds approximately to that warm play in the area F »
- the shaft regions lying above and below the piston running region F are tapered back to the extent shown in FIG. 4 in order to bring about a hydrodynamic floating of the piston shaft in these regions.
- the piston outer shape is entered in the pressure-counterpressure direction and in the pin direction.
- the regions of the outer piston shape lying in between merge continuously into the dimensions of those two main directions.
- a further improvement is brought about by the introduction of a strip-shaped insert in the form of either a closed steel ring 9 or a pair of a ring segment insert 10 in the piston head in the region radially behind the ring grooves 2, 3, 4.
- a strip-shaped insert in the form of either a closed steel ring 9 or a pair of a ring segment insert 10 in the piston head in the region radially behind the ring grooves 2, 3, 4.
- the inlay or inlays 9, 10 is or are essentially limited to the area below the top land area. In the direction of the shaft end, the inserts 9, 10 can each protrude from the piston crown material. This is useful because the inserts can be fixed relatively easily in the mold used to manufacture the piston.
- FIG. 5-7 show different versions of the position of a closed ring 9 inserted in the head part of the piston, in which the ring 9 is more or less exposed radially on the inside.
- 6 shows a different course of the ring 9 in the area of the hubs 6 of the piston.
- the ring 9 runs inside the hubs 6 in the vicinity of the outer circumference, while in FIG. 6b it runs straight through the hub area in a radially inner area in a chord-like manner.
- ring segments 10 are introduced into the piston head regions lying between the hubs 6, these ring segments 10 reaching into the hubs 6 in each case.
- the ringseg Te 10 are also integrally connected to the shaft inserts 7.
- the thermal expansion-inhibiting effect of the inserts 9, 10 is essentially due to the fact that the piston base material lying radially on the outside of the inserts shrinks onto the inserts during the manufacture of the piston, for example when it is cast, when the piston material cools down. When the piston material is rewarmed, the shrinkage stress must first be reduced before an actual expansion can take place.
- a spacing of the inserts 9, 10 from the piston crown surface is necessary in order to allow the heat to flow from the piston crown to the piston rings.
- the radial slot between the piston head and the shaft is favorable for low shaft clearances.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3644188 | 1986-12-23 | ||
DE3644188 | 1986-12-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0327595A1 true EP0327595A1 (de) | 1989-08-16 |
EP0327595B1 EP0327595B1 (de) | 1990-04-25 |
Family
ID=6317068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88900342A Expired - Lifetime EP0327595B1 (de) | 1986-12-23 | 1987-12-16 | Einteiliger, leichter und reibungsarmer leichtmetallkolben für verbrennungsmotoren |
Country Status (6)
Country | Link |
---|---|
US (1) | US5048398A (de) |
EP (1) | EP0327595B1 (de) |
JP (1) | JP2716492B2 (de) |
BR (1) | BR8707926A (de) |
DE (1) | DE3762445D1 (de) |
WO (1) | WO1988004724A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2983621B2 (ja) * | 1988-12-24 | 1999-11-29 | マーレ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 内燃機関用の軽量筒形ピストン |
DE3931949A1 (de) * | 1989-09-25 | 1991-04-04 | Alcan Gmbh | Kolben fuer einen verbrennungsmotor |
DE4110306A1 (de) * | 1990-09-20 | 1992-03-26 | Mahle Gmbh | Tauchkolben aus leichtmetall fuer ottomotoren |
US20060027095A1 (en) * | 2004-08-02 | 2006-02-09 | Miller Andrew J | Piston having centered pin hole and skirt profile |
DE102012212791B4 (de) * | 2012-07-20 | 2014-02-27 | Federal-Mogul Nürnberg GmbH | Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB608142A (en) * | 1945-11-20 | 1948-09-10 | Specialloid Ltd | Improvements in and relating to pistons |
DE1078387B (de) * | 1957-12-12 | 1960-03-24 | Schmidt Gmbh Karl | Aluminiumkolben mit im Schaft eingegossenen gekruemmten Regelgliedern |
CH437915A (de) * | 1965-01-23 | 1967-06-15 | Mahle Kg | Leichtmetallkolben für Brennkraftmaschinen |
DE1600513A1 (de) * | 1967-04-22 | 1970-04-02 | Mahle Kg | Leichtmetallkolben mit Regelgliedern |
JPS5138375B2 (de) * | 1973-03-20 | 1976-10-21 | ||
DE3430132A1 (de) * | 1984-08-16 | 1986-02-27 | Mahle Gmbh, 7000 Stuttgart | Aluminium-tauchkolben fuer verbrennungsmotoren mit regelstreifen |
DE3430258A1 (de) * | 1984-08-17 | 1986-02-27 | Mahle Gmbh, 7000 Stuttgart | Tauchkolben fuer verbrennungsmotoren |
DE3446121A1 (de) * | 1984-12-18 | 1985-08-01 | Mahle Gmbh, 7000 Stuttgart | Leichter extrem flacher tauchkolben fuer verbrennungsmotoren |
IT1182507B (it) * | 1985-07-12 | 1987-10-05 | Ae Borgo Spa | Pistoni con profilo asimmetrico per motori a combustione interna |
JPH0415968Y2 (de) * | 1985-10-18 | 1992-04-09 | ||
US4864986A (en) * | 1988-09-26 | 1989-09-12 | Brunswick Corporation | Two-cycle engine with offset piston ovality |
-
1987
- 1987-12-16 WO PCT/DE1987/000593 patent/WO1988004724A1/de active IP Right Grant
- 1987-12-16 EP EP88900342A patent/EP0327595B1/de not_active Expired - Lifetime
- 1987-12-16 BR BR8707926A patent/BR8707926A/pt not_active IP Right Cessation
- 1987-12-16 DE DE8888900342T patent/DE3762445D1/de not_active Expired - Fee Related
- 1987-12-16 US US07/368,298 patent/US5048398A/en not_active Expired - Fee Related
- 1987-12-16 JP JP63500507A patent/JP2716492B2/ja not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8804724A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5048398A (en) | 1991-09-17 |
JPH02501758A (ja) | 1990-06-14 |
EP0327595B1 (de) | 1990-04-25 |
JP2716492B2 (ja) | 1998-02-18 |
DE3762445D1 (de) | 1990-05-31 |
WO1988004724A1 (en) | 1988-06-30 |
BR8707926A (pt) | 1989-10-31 |
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