EP1072782A2 - Piston pour un moteur à combustion interne - Google Patents

Piston pour un moteur à combustion interne Download PDF

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Publication number
EP1072782A2
EP1072782A2 EP00114741A EP00114741A EP1072782A2 EP 1072782 A2 EP1072782 A2 EP 1072782A2 EP 00114741 A EP00114741 A EP 00114741A EP 00114741 A EP00114741 A EP 00114741A EP 1072782 A2 EP1072782 A2 EP 1072782A2
Authority
EP
European Patent Office
Prior art keywords
piston
webs
bolt hole
bolt
ring field
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
EP00114741A
Other languages
German (de)
English (en)
Other versions
EP1072782B1 (fr
EP1072782A3 (fr
Inventor
Emmerich Ottliczky
Gregor Müller
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP1072782A2 publication Critical patent/EP1072782A2/fr
Publication of EP1072782A3 publication Critical patent/EP1072782A3/fr
Application granted granted Critical
Publication of EP1072782B1 publication Critical patent/EP1072782B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02F3/027—Pistons  having means for accommodating or controlling heat expansion the skirt wall having cavities
    • 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
    • F02F3/025—Pistons  having means for accommodating or controlling heat expansion having circumferentially slotted piston skirts, e.g. T-slots

Definitions

  • the invention relates to a piston, in particular a piston for an internal combustion engine, according to the features of the preamble of claim 1.
  • Pistons especially for internal combustion engines, are generally known.
  • Such a piston consists of a piston skirt and one adjoining the piston skirt Ring field, the top of the ring field of the combustion chamber of the internal combustion engine is facing.
  • There is a bolt hole in the piston skirt for receiving one Bolt that connects the piston to the connecting rod.
  • Such a piston is also subject to high thermal loads during operation strong pressure loads caused by the combustion and the resulting Gas pressure are generated. Due to expansion and compression due to the ignition pressure There are tensile and compressive stresses on the piston crown, this ignition pressure the piston crown bulges or pushes in. This effect is still seen when the piston is operating reinforced that over the connecting rod and the bolt from the other side of the piston high forces act on the piston crown.
  • Modern pistons have been used to improve the combustion and exhaust behavior of Internal combustion engines in the piston crown with geometrically complex recesses with an undercut, so that the mentioned tensile and compressive stresses not only on a flat piston crown act, but also on the complex structure of the trough. So it comes in disadvantageously also to tensile and compressive stresses in the trough edge area, so that it breaks very quickly due to the forces introduced in the trough edge area of the piston comes. This has fatal effects on the internal combustion engine since it is destroyed without notice.
  • a piston which one Piston shaft having a bolt hole and an adjoining ring field.
  • this piston there are several longitudinally around the bolt hole stretched surveys provided. An elevation is exactly on the inside Axis of the bolt hole is arranged in the direction of the piston crown, whereby the piston crown area is used in the operation of the piston with very high compressive stresses.
  • this very strong deflection of the pressure curve plays no role, since the piston crown area has no trough and is therefore very stable and is heavily trained.
  • With the arrangement of a survey which is on the towards the Axis of the bolt hole extending piston crown region, occur in this region, in which the recess is located in modern pistons, very strong loads that lead to weakening or destruction of the piston.
  • the invention is therefore based on the object of a piston, in particular a piston for an internal combustion engine to improve such that destructions are avoided and tensions be dismantled within the piston.
  • Another advantage of the webs according to the invention is that they are already in the Casting mold of the piston can be provided so that the targeted force support and achieved the substantial reduction in tensile and compressive stresses extremely cost-effectively In addition, there is no need to rework the piston with regard to the webs, if these are already integrated in the mold. Likewise, the application of the invention Bars regardless of the material from which the piston is made.
  • an outer hub is at least partially around the bolt hole arranged, which together with the webs and the lower edge of the ring field Form bolt window.
  • the bolt hole becomes through the outer hub around the bolt hole reinforced, but at the same time material saved around the outer hub, so that this too effective weight reduction of the piston.
  • a portion of the outer hub encloses the bolt window, so that with very good power support material is saved at the same time, so the Increase weight loss.
  • the surface of the webs is parallel, inclined or curved the surface of the piston. It goes without saying that the surface of the The webs are set back at least extremely slightly relative to the surface (running surface) of the piston is. This can be done in such a way that the surface of the webs is parallel is set back against the tread of the piston, whereby also an inclined or curved surface with respect to the running surface of the piston is conceivable.
  • a preferred but not necessarily required inclination can be seen in such an orientation, that the surface of the webs in the region of the bolt hole or the outer hub of the bolt hole lies further behind the running surface of the piston than the surface of the webs in the area of the lower edge of the ring field. It could also be thought of the Execute the surface of the webs in the shape of a groove, so that with sufficient stability weight is further reduced.
  • the webs run parallel to one another from the bolt hole towards the ring field.
  • the webs can be within the diameter of the bolt hole be arranged, connect tangentially to the outer circumference of the bolt hole or can also be arranged outside the diameter of the bolt hole, In the webs are particularly advantageously approximately tangential to the outer circumference of the Bolt hole arranged in order to achieve a particularly optimal power support.
  • the webs run obliquely to one another from the bolt hole towards the ring field.
  • the webs run approximately V-shaped, with configurations are conceivable in which the webs in their extension through the axis of the bolt hole or can run outside the axis.
  • the webs are straight and / or curved.
  • Each after the geometric design of the bolt it can be advantageous to achieve a Optimal power support to design the bars straight or arched. So stand So several options are available for optimal power support and reduction the tensile and compressive stresses to design the webs.
  • the area of the bolt window is lower than a window area around the outer hub of the bolt hole. This can be done while maintaining the optimal force support, the weight of the piston can be further reduced, whereby Another advantage is that this recess of the bolt window already can be taken into account in the mold for the piston and therefore not higher Leads to manufacturing costs of the piston. In addition to saving weight, there is also Advantage of material savings and thus a cost reduction, given this Particularly noticeable in series production in large numbers (end of tape !!!) makes.
  • FIG. 1 shows a piston 1 designed according to the invention, which has a piston shaft 2 and has an annular field 3 adjoining the piston skirt 2.
  • a bolt hole 4 for receiving a bolt in a manner known per se, with which the piston 1 is connected via a connecting rod, not shown.
  • an outer hub 5 is around the bolt hole 4 arranged so that by means of the outer hub 5 and the window surface 6 around it, which is lower, both a reinforcement of the bolt hole 4 and a weight saving is achieved.
  • this deeper window area 6 also be in the area between the outer hub 5 and the lower edge of the ring field 3 would be a weakening of the piston 1, which adversely affects the voltages already described would lead in the piston crown area (see also Fig. 3).
  • webs 7 are therefore provided which extend from the outer hub 5 in the direction of the ring field 3 extend.
  • a bolt window 9 is generated, whereby the optimal already described Power support, accompanied by a weight saving, is achieved.
  • the area in the The depth of the bolt window 9 can be at the same level as the window surface 6; It is also conceivable that the surface of the bolt window 9 deepens relative to the window surface 6 is arranged to save additional material.
  • the bolt window 9 on the Bolt extends into the middle of the piston 1.
  • Fig. 1 it is shown that the two webs 7 run obliquely to each other.
  • the webs 7 on the inner diameter of the bolt hole 4 lie tangentially or arranged further in the direction of the central axis of the bolt hole 4 are.
  • An oblique arrangement of the webs 7 outside the bolt hole 4 or tangentially to the bolt hole 4 is also conceivable, but then the effect of the force support not as optimal as if the webs 7 are arranged within the bolt hole 4.
  • the longitudinal axes of the webs 7 can, but do not have to, the central axis of the bolt hole 4 cut.
  • Fig. 2 the piston 1 already shown in Fig. 1 is shown in sections, shown here is that the webs 7 run parallel to each other. Run in this embodiment the webs 7 approximately tangential to the bolt hole 4, wherein it is also conceivable that the webs 7 can run parallel to one another within the bolt hole 4 or outside.
  • a continuous area which is provided with the reference number 10 and hatched is shown. Because of this continuous area 10, the above occurs of the piston 1 shown voltage curve 11, this dashed voltage curve corresponds to the disadvantageous curvature of the piston crown area of the piston 1. Because of this voltage curve 11 and the resulting tensions In the piston crown area there are the disadvantages already described at the beginning Deformations especially of trough edge areas, which lead to destruction of the entire Pistons can lead.
  • Fig. 5 the piston 1 according to the invention is now shown, with reference to the Dashed line of the voltage curve 14 clearly shows that this curve 14 is now in is approximately wavy, but overall the deformation of the piston crown area is clear what is clear from the amplitudes of this undulating course 14 is reduced results.
  • the tensile and compressive stresses in the trough edge areas of the complex shaped Piston base area significantly reduced and destruction avoided.

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)
EP00114741A 1999-07-30 2000-07-08 Piston pour un moteur à combustion interne Expired - Lifetime EP1072782B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19935410A DE19935410A1 (de) 1999-07-30 1999-07-30 Kolben, insbesondere für eine Brennkraftmaschine
DE19935410 1999-07-30

Publications (3)

Publication Number Publication Date
EP1072782A2 true EP1072782A2 (fr) 2001-01-31
EP1072782A3 EP1072782A3 (fr) 2002-01-02
EP1072782B1 EP1072782B1 (fr) 2004-10-13

Family

ID=7916333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00114741A Expired - Lifetime EP1072782B1 (fr) 1999-07-30 2000-07-08 Piston pour un moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP1072782B1 (fr)
DE (2) DE19935410A1 (fr)
ES (1) ES2232357T3 (fr)
PL (1) PL341520A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012017317A1 (fr) * 2010-08-02 2012-02-09 Toyota Jidosha Kabushiki Kaisha Piston d'un moteur à combustion interne et procédé de fabrication du piston
CN106555699A (zh) * 2015-09-30 2017-04-05 北汽福田汽车股份有限公司 活塞装置及测试发动机缸孔变形的系统

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10113629A1 (de) * 2001-03-21 2002-10-02 Thyssen Krupp Automotive Ag Verfahren zur Herstellung von Kolben- bzw. Kolbenbauteilen sowie Schmiedewerkzeug
DE102007020447A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102009059056A1 (de) * 2009-12-18 2011-06-22 MAHLE International GmbH, 70376 Kolben für einen Verbrennungsmotor
WO2013138261A1 (fr) 2012-03-12 2013-09-19 Federal-Mogul Corporation Piston de moteur
DE102014210876A1 (de) * 2014-06-06 2015-12-17 Federal-Mogul Nürnberg GmbH Kolben und Verfahren zu dessen Herstellung
DE102014210875A1 (de) * 2014-06-06 2015-12-17 Federal-Mogul Nürnberg GmbH Kolben und Verfahren zu dessen Herstellung
WO2019096827A1 (fr) 2017-11-14 2019-05-23 Ks Kolbenschmidt Gmbh Piston en acier à design optimisé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539906C (de) 1927-03-16 1931-12-03 Bohn Aluminum & Brass Corp Leichtumetallkolben fuer Brennkraftmaschinen
DE876338C (de) 1936-05-07 1953-05-11 Bohn Aluminium & Brass Corp Ovaler Leichtmetallkolben fuer Brennkraftmaschinen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1741843A (en) * 1925-07-31 1929-12-31 Cleveland Trust Co Piston
US1775446A (en) * 1926-08-12 1930-09-09 Cleveland Trust Co Piston
US2062625A (en) * 1927-07-18 1936-12-01 Cleveland Trust Co Piston
US1812696A (en) * 1928-12-18 1931-06-30 Harry J Hater Piston
GB405071A (en) * 1932-09-29 1934-02-01 C M D Engineering Co Ltd Improvements in pistons for internal combustion engines
DE761065C (de) * 1941-09-05 1953-03-02 Aluminiumwerke Nuernberg G M B Gegossener Leichtmetallkolben fuer Brennkraftmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539906C (de) 1927-03-16 1931-12-03 Bohn Aluminum & Brass Corp Leichtumetallkolben fuer Brennkraftmaschinen
DE876338C (de) 1936-05-07 1953-05-11 Bohn Aluminium & Brass Corp Ovaler Leichtmetallkolben fuer Brennkraftmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012017317A1 (fr) * 2010-08-02 2012-02-09 Toyota Jidosha Kabushiki Kaisha Piston d'un moteur à combustion interne et procédé de fabrication du piston
CN103052787A (zh) * 2010-08-02 2013-04-17 丰田自动车株式会社 内燃机的活塞和活塞的制造方法
CN106555699A (zh) * 2015-09-30 2017-04-05 北汽福田汽车股份有限公司 活塞装置及测试发动机缸孔变形的系统
CN106555699B (zh) * 2015-09-30 2020-11-13 北京宝沃汽车有限公司 活塞装置及测试发动机缸孔变形的系统

Also Published As

Publication number Publication date
EP1072782B1 (fr) 2004-10-13
DE50008196D1 (de) 2004-11-18
ES2232357T3 (es) 2005-06-01
PL341520A1 (en) 2001-02-12
EP1072782A3 (fr) 2002-01-02
DE19935410A1 (de) 2001-02-08

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