EP0030399B1 - Piston en métal léger - Google Patents

Piston en métal léger Download PDF

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Publication number
EP0030399B1
EP0030399B1 EP80201071A EP80201071A EP0030399B1 EP 0030399 B1 EP0030399 B1 EP 0030399B1 EP 80201071 A EP80201071 A EP 80201071A EP 80201071 A EP80201071 A EP 80201071A EP 0030399 B1 EP0030399 B1 EP 0030399B1
Authority
EP
European Patent Office
Prior art keywords
piston
shaft
skirt
control
lower edge
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.)
Expired
Application number
EP80201071A
Other languages
German (de)
English (en)
Other versions
EP0030399A1 (fr
Inventor
Werner Steidle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl Schmidt GmbH
Original Assignee
Karl Schmidt GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6087752&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0030399(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Karl Schmidt GmbH filed Critical Karl Schmidt GmbH
Publication of EP0030399A1 publication Critical patent/EP0030399A1/fr
Application granted granted Critical
Publication of EP0030399B1 publication Critical patent/EP0030399B1/fr
Expired legal-status Critical Current

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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
    • 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
    • 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, each with a transverse slot made in the supporting piston skirt surfaces at the level of the pin bosses.
  • the light metal piston as a transmission element of the thermal into mechanical energy has become indispensable in modern internal combustion engine construction.
  • a large number of requirements are placed on such a piston in all operating states. It is always the goal to achieve good straightness with the light alloy piston despite the very different thermal expansion coefficient of the piston material compared to gray cast iron cylinders.
  • All such piston designs are based on the idea of preventing the undesired thermal increase in diameter of the piston with the aid of expansion-resistant steel inserts and of adapting the piston play in the pressure and counterpressure directions to the diameter of the cylinder under all possible operating conditions. This process is called control effect.
  • the cylinder of the internal combustion engine deforms under the thermal load and the gas pressures acting in the radial and axial direction and hardly maintains its cylindrical shape.
  • the piston must follow these deformations and allow adjustment through play and elasticity, although excessively high elasticities have a disadvantageous effect.
  • the control characteristic of the piston is determined by the coefficient of expansion and the temperature gradient between the piston head and shaft. Expansion coefficient and temperature gradient are different for each piston type and are influenced by design and engine-specific measures.
  • the running behavior of a piston is essentially determined by the play behavior in the operating phase. It is therefore a priority to be able to use a piston that has almost the same play behavior in all operating phases.
  • Control pistons are used for this purpose, with which the natural expansion on the shaft is reduced in the running direction.
  • Pistons are known for this, which separate the head and the ring field from the shaft via a transverse slot and which in some cases additionally have a steel insert on the shaft.
  • Such constructions fulfill the control function satisfactorily, but can only be used to a limited extent due to inadequate structural strength.
  • control pistons with steel inserts are used for motors with higher loads, which are not separated by a transverse slot between the upper shaft edge and the ring field.
  • Disadvantages with these constructions have emerged that either a poor control effect is achieved or, with a locally satisfactory control effect, there are strong control value differences between the upper and lower edge of the shaft.
  • ring-shaped or band-shaped inserts in the area of the upper end of the stem even a reversal of the control _ is detected effectively at the lower shank, that is, is greater extension values that set than is given by the natural expansion of the base material.
  • the expansion of the upper edge of the shaft is controlled by a control element and that of the lower edge of the shaft via the temperature control.
  • the direct, direct heat flow to the lower edge of the shaft is interrupted. Heat is only supplied via the pin hub.
  • the hub temperature is therefore significantly higher than the shaft temperature of the lower edge.
  • the control effect is due to the temperature differences in a plane on the increased incidence in B q lzenrich- processing.
  • the inventive design of the piston skirt does not deform the lower edge when the upper edge is loaded or the upper edge of the piston skirt when the lower edge is loaded.
  • the operating clearance of the lower edge is therefore not additionally increased when the upper edge is loaded, which ensures better shaft guidance and thus cheaper oil consumption.
  • the height of the control member can also be made shorter than the previous control piston designs, which leads to additional weight savings.
  • any desired control value can be set on the top and bottom edges. A reversal of the expansion coefficient is avoided.
  • the piston skirt designed according to the invention can be implemented in segment strips, ring strips, band strips and also in pistons with bimetal strips.
  • the upper and lower edge forces are recorded separately.
  • the constructive solution is mainly designed for the vertical absorption of forces. This applies to the shaft forces if the friction forces can be neglected. Since the frictional forces are only 1% of the lateral forces at a coefficient of friction of 0.01, neglect is justified. The support area to the hub can therefore be made narrow.
  • the upper shaft part is connected directly to the ring field, while the lower shaft part can be separated from the ring field with less load.
  • the piston consists of the piston head 1, the upper part 2 and the lower part 3 of the piston shaft.
  • the two piston skirt parts 2, 3 are each separated by a transverse slot 5 which extends approximately at the level of the pin bosses 4 and which extends from the regions 6, 6 'of the load-bearing piston skirt surfaces to the pin bosses 4 into the upper and lower piston skirt parts 2, 3 expanded.
  • the lower shaft part 3 has a stiffening collar 7, which is connected to the pin hub 4.
  • a segment strip 9 is cast in between the pin bosses 4 and the lowermost ring groove 8 as a control element.
  • the control element 9 separates the upper edge of the upper shaft part 2 from the ring field by a gap that forms.

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)

Claims (2)

1. Piston en métal léger comportant une fente transversale (5) ménagée dans les surfaces de Ja jupe de piston à hauteur des bossages (4) de l'axe de piston, caractérisé par le fait que la fente transversale qui s'étend périphériquement d'un bossage à l'autre de l'axe de piston s'élargit à partir des zones portantes (6, 6') des surfaces de la jupe de piston jusqu'aux bossages de l'axe de piston dans la partie inférieure et la partie supérieure (2, 3) de la jupe de piston, que la partie inférieure (3) de la jupe est reliée uniquement aux bossages de l'axe de piston et qu'un organe de régulation (9) est disposé dans la partie supérieure (2) de la jupe de piston.
2. Piston en métal léger suivant la revendication 1, caractérisé par le fait que la partie inférieure (3) de la jupe est munie d'un collet de rigidification (7) situé sur sa face inférieure.
EP80201071A 1979-12-06 1980-11-11 Piston en métal léger Expired EP0030399B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792949091 DE2949091A1 (de) 1979-12-06 1979-12-06 Leichtmetall-regelkolben
DE2949091 1979-12-06

Publications (2)

Publication Number Publication Date
EP0030399A1 EP0030399A1 (fr) 1981-06-17
EP0030399B1 true EP0030399B1 (fr) 1984-03-28

Family

ID=6087752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80201071A Expired EP0030399B1 (fr) 1979-12-06 1980-11-11 Piston en métal léger

Country Status (4)

Country Link
US (1) US4354426A (fr)
EP (1) EP0030399B1 (fr)
BR (1) BR8007985A (fr)
DE (2) DE2949091A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3024891A1 (de) * 1980-07-01 1982-02-11 Karl Schmidt Gmbh, 7107 Neckarsulm Leichtmetall-regelkolben fuer brennkraftmaschinen
EP0071361B2 (fr) * 1981-07-31 1995-07-19 Ae Plc Piston pour un moteur à combustion interne
GB8423050D0 (en) * 1984-09-12 1984-10-17 Ae Plc Pistons
GB8432015D0 (en) * 1984-12-19 1985-01-30 Ae Plc Pistons
GB8824222D0 (en) * 1988-10-15 1988-11-23 Wellworthy Ltd Pistons
DE19547157A1 (de) * 1995-12-16 1997-06-19 Mahle Gmbh Kolben-Zylinder-Baueinheit
US8474366B2 (en) 2007-08-13 2013-07-02 Federal-Mogul Corporation Piston with a skirt having oil flow slots and method of construction thereof
US8042453B2 (en) 2007-08-13 2011-10-25 Federal-Mogul Corporation Piston with a skirt having oil flow slots
USD645883S1 (en) 2009-10-27 2011-09-27 Federal-Mogul Corporation Piston lower crown
CN103147840B (zh) * 2012-12-18 2015-04-22 宁波大叶园林设备有限公司 活塞裙部对数微分等角线裙边紊流回窜降排的汽油发动机
CN105143732A (zh) * 2013-01-29 2015-12-09 马勒国际有限公司 具有第四环导槽和改良摩擦特性的钢制活塞

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE17193E (en) * 1929-01-15 Piston
US1526883A (en) * 1922-12-29 1925-02-17 Napier & Son Ltd Piston
US1792504A (en) * 1927-03-16 1931-02-17 Bohn Aluminium & Brass Corp Piston
US1949542A (en) * 1931-07-16 1934-03-06 Charles A Criqui Piston
DE577388C (de) * 1931-12-12 1933-05-30 Karl Friedrich Wagner Leichtmetallkolben mit Stahlringen fuer Brennkraftmaschinen
US2129180A (en) * 1932-07-30 1938-09-06 Elmer C Long Piston for internal combustion motors
DE738948C (de) * 1933-11-21 1943-09-08 Mahle Kg Leichtmetallkolben fuer Brennkraftmaschinen
US2086677A (en) * 1934-07-19 1937-07-13 Adolph L Nelson Piston
US2127767A (en) * 1935-10-14 1938-08-23 Ray E Day Piston
US2238087A (en) * 1938-05-16 1941-04-15 Sterling Corp Piston
US2309555A (en) * 1942-03-30 1943-01-26 Sterling Corp Piston
US2551488A (en) * 1948-02-18 1951-05-01 Thompson Prod Inc Controlled expansion piston
FR86284E (fr) * 1964-08-10 1966-01-07 Piston léger rationnel pour moteurs et toutes machines
US3259028A (en) * 1964-03-20 1966-07-05 Ford Motor Co Piston
DE1264899B (de) * 1965-12-23 1968-03-28 Schmidt Gmbh Karl Vollschaftkolben fuer Verbrennungskraftmaschinen
DE1284762B (de) * 1966-09-27 1968-12-05 Mahle Kg Leichtmetallkolben, insbesondere fuer Brennkraftmaschinen
US3613521A (en) * 1968-11-07 1971-10-19 Komatsu Mfg Co Ltd Piston for internal combustion engine
DE1949581A1 (de) * 1969-10-01 1971-04-08 Schmidt Gmbh Karl Kolben fuer Verbrennungskraftmaschinen

Also Published As

Publication number Publication date
EP0030399A1 (fr) 1981-06-17
BR8007985A (pt) 1981-06-23
DE3067288D1 (en) 1984-05-03
US4354426A (en) 1982-10-19
DE2949091A1 (de) 1981-06-11

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