EP1072782B1 - Piston pour un moteur à combustion interne - Google Patents

Piston pour un moteur à combustion interne Download PDF

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Publication number
EP1072782B1
EP1072782B1 EP00114741A EP00114741A EP1072782B1 EP 1072782 B1 EP1072782 B1 EP 1072782B1 EP 00114741 A EP00114741 A EP 00114741A EP 00114741 A EP00114741 A EP 00114741A EP 1072782 B1 EP1072782 B1 EP 1072782B1
Authority
EP
European Patent Office
Prior art keywords
piston
webs
bolt hole
bolt
area
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 - Lifetime
Application number
EP00114741A
Other languages
German (de)
English (en)
Other versions
EP1072782A2 (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 in particular for internal combustion engines, are well known.
  • Such a piston consists of a piston stem and one adjoining the piston skirt Ring field, wherein the top of the ring field of the combustion chamber of the internal combustion engine is facing.
  • a bolt hole for receiving a Bolzens, via which the piston is connected to the connecting rod.
  • Such a piston is also subject to high thermal loads during operation strong compressive stresses caused by the combustion and the resulting Gas pressure can be generated.
  • This ignition pressure arise at the piston crown tensile and compressive stresses, this ignition pressure the piston crown bulges or pushes. This effect is still in operation of the piston thereby 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 to improve the combustion and the exhaust gas behavior of Internal combustion engines in the piston crown geometrically complex recesses with undercut , so that the mentioned tensile and compressive stresses not only on a flat piston crown but also on the complex structure of the hollow. That's how it comes in disadvantageous way also to tensile and compressive stresses in the bowl edge area, so that it very quickly due to the forces introduced in the trough edge area to a break the piston comes. This has fatal effects on the internal combustion engine, since these is destroyed without notice.
  • a piston for an internal combustion engine which has a a bolt hole having piston stem and an adjoining Ring field, wherein, starting from the bolt hole on the outer Surface of the piston two webs extend in the direction of the ring field and the Webs form a bolt window and at least partially around the bolt hole an outer hub is arranged.
  • this known piston of the ring field having the piston head and the piston shaft connected to each other via two webs, wherein around the webs around a radially circumferential recess between Piston bottom and piston skirt is present, which at combustion pressures of modern internal combustion engines to comply with required environmental regulations lead to an undesirable deformation of the piston crown.
  • the invention is therefore based on the object, a piston, in particular a piston for an internal combustion engine, to improve such that destructions avoided and voltages be degraded within the piston.
  • Another advantage of the webs of the invention is that they already in the Mold of the piston can be provided so that the targeted power and achieved the substantial reduction of tensile and compressive stresses extremely cost can be.
  • the application of the invention Webs regardless of the material from which the piston is made.
  • an outer hub is at least partially arranged around the bolt hole, which together with the webs and the lower edge of the ring field form the bolt window.
  • the surface of the webs is parallel, inclined or curved to arranged the surface of the piston. It goes without saying that the surface of the Webs at least extremely low compared to the surface (running surface) of the piston reset is. This can be done in such a way that the surface of the webs parallel is set back against the tread of the piston, with an inclined or curved surface with respect to the running surface of the piston is conceivable. A preferred, however not necessarily required inclination is to 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 further behind the tread of the piston lies back than the surface of the webs in the area of the lower edge of the ring field. It could also be thought of that To perform surface of the webs grooved, so that with sufficient stability further weight is reduced.
  • the webs run parallel to each other from the bolt hole in the direction of the ring field.
  • the webs can within the diameter of the bolt hole be arranged to connect tangentially to the outer circumference of the bolt hole or be arranged outside the diameter of the bolt hole.
  • the webs are approximately tangential to the outer circumference of the Bolt holes arranged so as to achieve a particularly optimal power support.
  • the webs run obliquely to each other from the bolt hole in the direction of the ring field.
  • the webs are approximately V-shaped, with embodiments are conceivable in which the webs in their extension through the axis of the bolt hole or outside the axis.
  • the webs are straight and / or arcuate. ever according to geometric design of the bolt, it may be advantageous to achieve a optimal force support the webs straight or arcuate design. Thus stand So several options available for optimum power and reduction the tensile and compressive stresses to make the webs.
  • the surface of the bolt window is lower than a window surface around the outer hub of the bolt hole. This can be done while maintaining the optimal power support the weight of the piston can be further reduced, wherein Another advantage is that this recess of the bolt window already can be considered in the mold for the piston and thus to no higher Costs in the production of the piston leads. In addition to the weight savings is also the Advantage of the material savings and thus a cost reduction, where this is just in a series production in high quantities (end of tape !!!) positively noticeable power.
  • Fig. 1 shows an inventively designed piston 1, a piston shaft 2 and a subsequent to the piston skirt 2 ring field 3 has.
  • a bolt hole 4 for receiving a bolt is provided in a manner known per se, with which the piston 1 is connected via a connecting rod, not shown.
  • at the embodiment shown in Figure 1 is around the bolt hole 4 around an outer hub fifth arranged so that by means of the outer hub 5 and the window surface 6 therefore existing, which is lower, both a gain of the bolt hole 4 and a weight saving is achieved. If this deeper lying window surface 6 in the area between the outer hub 5 and the lower edge of the ring field 3, it would be a weakening given the piston 1, which disadvantageously to the already described voltages would lead in the piston crown area (see also Fig. 3).
  • webs 7 are provided, extending from the outer hub 5 in the direction of the ring field 3 extend.
  • a bolt window 9 is generated, whereby the already described optimal Force support, accompanied by a weight saving, is achieved.
  • the area in 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 recesses relative to the window surface 6 is arranged to save further material.
  • the bolt window 9 over the Bolt extends into the middle of the piston 1.
  • Fig. 1 it is shown that the two webs 7 extend obliquely to each other.
  • the webs 7 on the inner diameter of the bolt hole 4 tangentially or further arranged in the direction of the center axis of the bolt hole 4 are.
  • An oblique arrangement of the webs 7 outside the bolt hole 4 or tangentially is also conceivable, but then the effect of the power support not so optimal, as if the webs 7 are arranged within the bolt hole 4.
  • the longitudinal axes of the webs 7, the central axis of the bolt hole 4 cut.
  • Fig. 2 the piston 1 already shown in Fig. 1 is shown in fragmentary form, wherein shown here is that the webs 7 are parallel to each other. In this embodiment run the webs 7 in approximately tangential to the bolt hole 4, wherein it is also conceivable that the webs 7 can run parallel to each other within the bolt hole 4 or outside.
  • a continuous area which is provided with the reference numeral 10 and hatched is shown. Due to this continuous area 10, it comes to the above of the piston 1 shown voltage curve 11, wherein this dashed line voltage curve the disadvantageous curvature of the piston crown region of the piston 1 corresponds. Because of this voltage curve 11 and the resulting voltages in the piston crown area, it comes to the initially described disadvantageous Deformations in particular of Muldenrand Schemeen, leading to the destruction of the entire Can lead piston.
  • Fig. 4 shows a further measure with which the voltage curve can be influenced.
  • a wide area is provided here, which is hatched and has the reference numeral 12.
  • This wide range leads, as can be seen in the voltage curve 13, to a flattening of Course and thus to a reduction of the curvature of the piston crown area, wherein this flattening and curvature reduction is still unsatisfactory.
  • This is in particular in the case of pistons which have complexly shaped depressions in the piston crown region, still not sufficient, since the complex executed piston crown area for Part requires very thin trough edges, of the course 13 in the embodiment of the Piston according to FIG. 4 are still destroyed.

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 (6)

  1. Piston (1) pour un moteur à combustion interne, comportant une jupe de piston (2) avec un trou (4) pour l'axe de piston et une zone (3) annulaire adjacente à celle-ci, deux nervures (7) s'étendant sur la surface extérieure du piston (1) à partir du trou (4) pour l'axe de piston en direction de la zone (3) annulaire, et les nervures (7) formant une fenêtre (9) d'axe de piston, et un renfort circulaire extérieur (5) étant disposé au moins partiellement autour du trou (4) pour l'axe de piston, caractérisé en ce que la jupe de piston (2) est disposée sans interruption en dessous de la zone (3) annulaire et en ce que le renfort circulaire extérieur (5) forme, avec les nervures (7) et un bord inférieur (8) de la zone (3) annulaire, la fenêtre (9) d'axe de piston, et en ce que la surface de la fenêtre (9) d'axe de piston se situe plus bas qu'une surface de fenêtre (6) autour du renfort circulaire extérieur (5).
  2. Piston (1) selon la revendication 1, caractérisé en ce que la surface supérieure des nervures (7) est disposée de manière parallèle, inclinée ou en arc par rapport à la surface du piston (1).
  3. Piston (1) selon l'une des revendications précédentes, caractérisé en ce que les nervures (7) s'étendent de manière parallèle l'une par rapport à l'autre depuis le trou (4) pour l'axe de piston en direction de la zone (3) annulaire.
  4. Piston (1) selon l'une des revendications précédentes, caractérisé en ce que les nervures (7) s'étendent de manière inclinée l'une par rapport à l'autre depuis le trou (4) pour l'axe de piston en direction de la zone (3) annulaire.
  5. Piston (1) selon l'une des revendications précédentes, caractérisé en ce que les nervures (7) ont une forme droite et/ou d'arc de cercle dans la direction longitudinale.
  6. Piston (1) selon l'une des revendications précédentes, caractérisé en ce que la zone de transition entre la fenêtre (9) d'axe de piston et le renfort circulaire extérieur (5) et/ou les nervures (7) et/ou le bord inférieur (8) de la zone (3) annulaire est renforcée.
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
DE19935410 1999-07-30
DE19935410A DE19935410A1 (de) 1999-07-30 1999-07-30 Kolben, insbesondere für eine Brennkraftmaschine

Publications (3)

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

Families Citing this family (9)

* 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
JP2012031814A (ja) * 2010-08-02 2012-02-16 Toyota Motor Corp 内燃機関のピストンおよびその製造方法
WO2013138261A1 (fr) 2012-03-12 2013-09-19 Federal-Mogul Corporation Piston de moteur
DE102014210875A1 (de) * 2014-06-06 2015-12-17 Federal-Mogul Nürnberg GmbH Kolben und Verfahren zu dessen Herstellung
DE102014210876A1 (de) * 2014-06-06 2015-12-17 Federal-Mogul Nürnberg GmbH Kolben und Verfahren zu dessen Herstellung
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
DE102018128512A1 (de) 2017-11-14 2019-05-16 Ks Kolbenschmidt Gmbh Stahlkolben mit optimiertem Design

Family Cites Families (8)

* 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
US1732414A (en) * 1927-03-16 1929-10-22 Bohn Aluminium & Brass Corp 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
US2257184A (en) * 1936-05-07 1941-09-30 Bohn Aluminium & Brass Corp Piston
DE761065C (de) * 1941-09-05 1953-03-02 Aluminiumwerke Nuernberg G M B Gegossener Leichtmetallkolben fuer Brennkraftmaschinen

Also Published As

Publication number Publication date
EP1072782A2 (fr) 2001-01-31
EP1072782A3 (fr) 2002-01-02
DE19935410A1 (de) 2001-02-08
ES2232357T3 (es) 2005-06-01
DE50008196D1 (de) 2004-11-18
PL341520A1 (en) 2001-02-12

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