EP0030399A1 - Piston en métal léger - Google Patents

Piston en métal léger Download PDF

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Publication number
EP0030399A1
EP0030399A1 EP80201071A EP80201071A EP0030399A1 EP 0030399 A1 EP0030399 A1 EP 0030399A1 EP 80201071 A EP80201071 A EP 80201071A EP 80201071 A EP80201071 A EP 80201071A EP 0030399 A1 EP0030399 A1 EP 0030399A1
Authority
EP
European Patent Office
Prior art keywords
shaft
piston
light metal
lower edge
control piston
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
Application number
EP80201071A
Other languages
German (de)
English (en)
Other versions
EP0030399B1 (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(A1) "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 control piston.
  • 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.
  • the cylinder of the internal combustion engine deforms in the radial and axial direction under the thermal load and the acting gas pressures and hardly maintains its cylindrical shape.
  • the piston must follow these deformations and through play and elasticity allow an adjustment, but too 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.
  • the transverse slot widens from the load-bearing areas of the shaft surfaces towards the pin bosses into the upper and lower shaft parts.
  • the lower shaft part is connected to the pin hub, so that the upper and lower parts of the piston shaft are designed as sliding shoe-like tabs in the area of the supporting shaft surfaces.
  • the shaft guide is therefore made in two parts.
  • 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 heat flow to the lower edge of the shaft is interrupted. A heat supply takes place just over the hub.
  • the hub temperature is therefore significantly higher than the shaft temperature of the lower edge. Due to the temperature differences in one plane, the control effect is based on the increased expansion in the direction of the bolt.
  • 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 an additional weight saving.
  • any desired control value can be set on the upper and lower edge by constructively varying the wall thicknesses of the piston skirt parts. A reversal of the expansion coefficient is avoided.
  • the piston skirt designed according to the invention can be realized 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 with a coefficient of friction of 0.01 are only 1% of the lateral forces, 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 skirt.
  • the two piston skirt parts 2 and 3 are 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 supporting shaft surfaces to the pin bosses 4 in an upward and downward arc.
  • the lower shaft part 3 has a stiffening collar 7, which with the Bolt hub 4 is connected.
  • a segment strip 9 is cast in between the pin bosses 4 and the lowest 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 which 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)
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 true EP0030399A1 (fr) 1981-06-17
EP0030399B1 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043147A1 (fr) * 1980-07-01 1982-01-06 KOLBENSCHMIDT Aktiengesellschaft Piston à expansion réglée à métal léger pour moteur à combustion interne
GB2164419A (en) * 1984-09-12 1986-03-19 Ae Plc Improvements in or relating to pistons
WO2011060131A1 (fr) * 2009-11-13 2011-05-19 Federal-Mogul Corporation Piston avec une jupe comportant des fentes d'écoulement d'huile et son procédé de construction
US8042453B2 (en) 2007-08-13 2011-10-25 Federal-Mogul Corporation Piston with a skirt having oil flow slots

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071361B2 (fr) * 1981-07-31 1995-07-19 Ae Plc Piston pour un moteur à combustion interne
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
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE17193E (en) * 1929-01-15 Piston
DE577388C (de) * 1931-12-12 1933-05-30 Karl Friedrich Wagner Leichtmetallkolben mit Stahlringen fuer Brennkraftmaschinen
US2127767A (en) * 1935-10-14 1938-08-23 Ray E Day Piston
US2309555A (en) * 1942-03-30 1943-01-26 Sterling Corp Piston
DE738948C (de) * 1933-11-21 1943-09-08 Mahle Kg Leichtmetallkolben fuer Brennkraftmaschinen
FR86284E (fr) * 1964-08-10 1966-01-07 Piston léger rationnel pour moteurs et toutes machines
DE1264899B (de) * 1965-12-23 1968-03-28 Schmidt Gmbh Karl Vollschaftkolben fuer Verbrennungskraftmaschinen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2129180A (en) * 1932-07-30 1938-09-06 Elmer C Long Piston for internal combustion motors
US2086677A (en) * 1934-07-19 1937-07-13 Adolph L Nelson Piston
US2238087A (en) * 1938-05-16 1941-04-15 Sterling Corp Piston
US2551488A (en) * 1948-02-18 1951-05-01 Thompson Prod Inc Controlled expansion piston
US3259028A (en) * 1964-03-20 1966-07-05 Ford Motor Co Piston
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE17193E (en) * 1929-01-15 Piston
DE577388C (de) * 1931-12-12 1933-05-30 Karl Friedrich Wagner Leichtmetallkolben mit Stahlringen fuer Brennkraftmaschinen
DE738948C (de) * 1933-11-21 1943-09-08 Mahle Kg Leichtmetallkolben fuer Brennkraftmaschinen
US2127767A (en) * 1935-10-14 1938-08-23 Ray E Day Piston
US2309555A (en) * 1942-03-30 1943-01-26 Sterling Corp Piston
FR86284E (fr) * 1964-08-10 1966-01-07 Piston léger rationnel pour moteurs et toutes machines
DE1264899B (de) * 1965-12-23 1968-03-28 Schmidt Gmbh Karl Vollschaftkolben fuer Verbrennungskraftmaschinen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043147A1 (fr) * 1980-07-01 1982-01-06 KOLBENSCHMIDT Aktiengesellschaft Piston à expansion réglée à métal léger pour moteur à combustion interne
GB2164419A (en) * 1984-09-12 1986-03-19 Ae Plc Improvements in or relating to pistons
US4702151A (en) * 1984-09-12 1987-10-27 Ae Plc Pistons
US8042453B2 (en) 2007-08-13 2011-10-25 Federal-Mogul Corporation Piston with a skirt having oil flow slots
US8474366B2 (en) 2007-08-13 2013-07-02 Federal-Mogul Corporation Piston with a skirt having oil flow slots and method of construction thereof
WO2011060131A1 (fr) * 2009-11-13 2011-05-19 Federal-Mogul Corporation Piston avec une jupe comportant des fentes d'écoulement d'huile et son procédé de construction

Also Published As

Publication number Publication date
BR8007985A (pt) 1981-06-23
DE3067288D1 (en) 1984-05-03
US4354426A (en) 1982-10-19
DE2949091A1 (de) 1981-06-11
EP0030399B1 (fr) 1984-03-28

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