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EP0838587B1 - Piston allégé - Google Patents

Piston allégé Download PDF

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Publication number
EP0838587B1
EP0838587B1 EP97118337A EP97118337A EP0838587B1 EP 0838587 B1 EP0838587 B1 EP 0838587B1 EP 97118337 A EP97118337 A EP 97118337A EP 97118337 A EP97118337 A EP 97118337A EP 0838587 B1 EP0838587 B1 EP 0838587B1
Authority
EP
European Patent Office
Prior art keywords
piston
wall sections
shaft wall
constructed
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
EP97118337A
Other languages
German (de)
English (en)
Other versions
EP0838587B2 (fr
EP0838587A1 (fr
Inventor
Josef Harrer
Dirk Ragus
Stephan Thieme
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.)
Federal Mogul Nuernberg GmbH
Original Assignee
Federal Mogul Nuernberg 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7809584&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0838587(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Federal Mogul Nuernberg GmbH filed Critical Federal Mogul Nuernberg GmbH
Publication of EP0838587A1 publication Critical patent/EP0838587A1/fr
Application granted granted Critical
Publication of EP0838587B1 publication Critical patent/EP0838587B1/fr
Publication of EP0838587B2 publication Critical patent/EP0838587B2/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 
    • 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

Definitions

  • the invention relates to a piston for a Internal combustion engine according to the preamble of claim 1.
  • Such a piston is described in EP 0 385 390 A1 and typically has shaft surfaces that are not in all areas along the height of the piston skirt completely cylindrical and circular in cross-section are trained.
  • the piston skirt is in one upper area largely cylindrical to the space for the combustion taking place in an internal combustion engine complete.
  • To reduce the weight of the piston Pin hubs for receiving the connecting rod pin in the direction of the diameter of the piston skirt set back inwards. This will remove the areas of the pin hubs that are used for the Recording the piston pin are indispensable from the Shaft surface, i.e. the outer surface of the piston inside, offset to the piston axis. Consequently, in the outside areas of material can be saved and it will achieved a weight reduction.
  • Such a piston with pin hubs offset inwards must also be at the level of the pin bosses and below the Bolt hubs have shaft wall sections, with which he after installation in the cylinder of an internal combustion engine on the Cylinder wall abuts.
  • These shaft wall sections too are referred to as load-bearing shaft wall sections because they ensure that the piston is guided in the cylinder thus radial in a lower region of the piston skirt opposite sides with respect to the pin axis, namely on the pressure side on the one hand and on the counter pressure side on the other hand, trained. At these points, they worry Shaft wall sections for supporting the piston in the Up and down movement in the cylinder where the piston can tilt around the piston pin axis.
  • the two shaft wall sections are one Dimension in the circumferential direction, so to speak a width formed, which is in the direction of the piston axis, that is the height of the piston. Furthermore, the two shaft wall sections are one Dimension in the circumferential direction, so to speak a width formed, which is in the direction of the piston axis, that is the height of the piston. Furthermore, the two shaft wall sections are one Dimension in the circumferential direction, so to speak a width formed, which is in the direction of the piston axis, that is the height of the piston. Furthermore, the
  • the width of the two shaft wall sections to the lower end of the Piston shaft is designed to become larger.
  • the two Connecting walls thus inclined and inclined to each other in this way trained that their distance in a lower area larger is as in an upper range. In other words, get lost the connecting walls are somewhat conical to each other.
  • shaft wall sections are such designed that they as a whole Shaft wall sections are designed, and on the shaft walls no zones are formed to support the piston make no contribution to the inner wall of the cylinder. Such Areas are therefore not required for strength and are left out according to the invention. This is what it is about in particular those areas that are more than 0.2 mm are set back from the cylinder wall. Likewise can the course of the shaft wall sections to that of the Adjusted elasticity of the piston requirements become.
  • the piston has been improved in accordance with EP 0 385 390 A1, that with this piston over the entire height with a constant width formed shaft wall sections be narrowed in areas such that a noticeable Weight reduction without sacrificing strength and Supporting properties in the cylinder is achieved.
  • the connecting walls are the course of the side Edges of the shaft wall sections are adapted.
  • the two load-bearing shaft wall sections are with regard to their dimension in the circumferential direction upwards rejuvenated.
  • Side wall sections largely as a side view reverse T are designed, and in a lower area are significantly wider than in an upper area, by being closed at the circumferentially border the trained area of the piston skirt.
  • Connecting walls inclined towards each other upwards.
  • a similar piston is known from DE 41 22 921 A1.
  • the shaft wall sections are largely X-shaped designed, the lower area in turn by an am lower edge of the piston circumferential ring is formed.
  • the shaft is thus cut out in places, and the connecting walls are in the area of the recesses also excluded.
  • this will increase the strength of the Shaft wall sections impaired in that the Shaft surface not always completely on the cylinder wall is present. Rather, this is only due to the invention Training of the connecting walls achieved that none Are recessed, but for a support of the bearing shaft wall sections the course of their lateral Edges follow.
  • US 5,448,942 describes a piston, the bearing areas of the shaft walls the shape of an inverted T have. The other, non-supporting areas of the However, stem walls are also present on this piston, so that this piston is disadvantageous in terms of its weight is. This applies in the same way to the piston according to the US 5,058,489, in which the shaft walls through the actual contact area with the cylinder wall and others Areas are formed so that the resulting piston is unnecessarily difficult.
  • the piston made of light metal, for example Aluminum or an aluminum alloy to train the Weight of the piston low due to this choice of material hold.
  • the shaft wall sections are accordingly preferably of such a type trained that they are in the area of their entire outer surface as load-bearing shaft wall sections for the support of the Ensure the piston on an inner wall of the cylinder. This allows how described, for the shaft wall sections each for each Place one along the height of the piston skirt Width dimension can be chosen, which for the guidance of the Piston is absolutely necessary. Any other Areas of the shaft wall sections which are designed in such a way that when installed in a cylinder by more than 0.2 mm can be set back against the cylinder wall to be dispensed with. When installing in the cylinder with the These zones provide the distance from the inner wall of the cylinder the shaft wall sections namely no contribution to wear and supporting the piston on the cylinder wall.
  • the side edges can also be beneficial the load-bearing shaft wall sections in the course of their Form taper curved, so that the connecting walls concave with respect to their course in the direction of the piston axis or are convexly curved. Consequently, the two would Connecting walls are then convexly curved, if the lateral edges of the shaft wall sections in the Side view would be curved outwards. It was the same proven to be favorable in special applications, the lateral edges of the load-bearing shaft wall sections form curved inside, so that the two Connecting walls not only upwards or downwards are inclined to each other, but also in each case concavely curved.
  • piston skirt in its upper, over the set back
  • the pin bosses for use with a Stepped connecting rods stepped on their sides facing each other are trained.
  • This measure is for the Piston according to the invention particularly suitable if the load-bearing shaft wall sections tapered towards the top are trained. This makes the two connecting walls inclined upwards towards each other, so that even those Zones in which the pin bosses are to be formed, especially in an upper area very far inwards are offset.
  • Piston in this embodiment is particularly advantageous Weight saving while ensuring the strength and the Function can be achieved.
  • the piston 10 shown in FIG. 1 has a piston shaft 16 and an upper, largely cylindrical Area 14 on.
  • this upper area 14 i.e. the Ring field area, the piston 10 with one or more partially circumferential and parallel to the piston crown Slots.
  • the pin bosses 24 which are designed to accommodate the Piston pin (not shown) when assembling the piston serve with a connecting rod (not shown).
  • Bolt hubs 24 can be in the area below the overhang 26 the generic piston material can be saved so that the weight of the piston 10 can also be reduced.
  • the two shaft wall sections 16 are with a dimension in the circumferential direction, so to speak one Width formed in the direction of the piston axis changed.
  • the two connecting walls 18 further formed such that they follow the course of the Edges 20, 22 of the direction of the piston axis Shaft wall sections 16 follow.
  • the connecting walls are located 18 to a certain extent in an oblique position.
  • the lateral edges 20, 22 of the supporting shaft wall sections 16 also designed convexly curved. Hence they are Connecting walls 18 in the area of their surface, that is in the Course from the lower edge of the piston to below the Overhang 26 convexly curved.
  • Shaft wall section 16 only along its height wide as it is for the support of the piston 10th on an inner cylinder wall is required.
  • Fig. 2 up tapering design of the supporting shaft wall sections 16 a further significant weight reduction can be achieved.
  • FIG. 2 it is further clarified that that on the piston 10 according to the invention at its lower edge no area is formed which is circular in cross-section and which corresponds in its dimensions to the upper region 14. Furthermore, the piston 10 along its circumference formed two recessed walls 18 set back.
  • FIG. 3 shows an advantageous development of the one shown in FIG. 1 and 2 shown piston 10.
  • taken in the area of the piston axis 30 3 again shows the sectional view of the invention to recognize oblique course of the two connecting walls 18.
  • Connecting walls 18 to recognize that the course of the (not shown) edges 20, 22 of the shaft wall sections 16 approximately corresponds to the course shown in FIGS. 1 and 2.
  • the two Bolt hubs 24 each from the outer edge of the top Area 14 are set back, however, over their entire Height along the piston axis 30 have the same width.
  • the piston 10 shown in Fig. 3 is also in the range of the overhang 26 of the upper region 14 over the pin hubs 24 provided with hollows 32. These hollows can because the upper region 14, such as described, has an overhang 26 in this area. Furthermore, the inclined position of the connecting walls 18 enables which increases the width of the overhang 26, the formation of cavities 32. These cavities can either be through Milling the cast piston or by suitable Casting cores are already formed during casting. Through this Measure can be achieved by saving material in the area of Cavities 32 for the piston 10 according to the invention another Reduction in his weight can be achieved.
  • the piston 10 is suitable for use with a stepped connecting rod (not shown).
  • a Step connecting rod is the eyelet in which the piston pin is recorded, narrower in an upper area trained as in a lower area.
  • the inner edges 34 of the pin bosses 24 are designed so that they are in an upper area have a smaller distance than in a lower area. This measure can also in the event that the Bolt hubs are set back very far, for example at the embodiment shown in Fig.
  • connecting walls 18 are not absolutely so straight between those to be connected Shaft wall sections 16 must be formed in that Side and cross-sectional views of FIGS. 2 to 5 only their outlines are recognizable. Rather you can the connecting walls 18 in the area of the pin bosses 24 be spherical on the outside, so that in a bottom view an outwardly curved "plan" of the connecting walls 18 would be recognizable. It is essential to the invention that the Connecting walls 18 with respect to their in the side and Sectional view of the outline of the height of the piston 10 changing width of the Shaft wall sections 16 follow. As a result, despite the Recess of the shaft wall sections 18 in the for Adequate zones not required Strength of the piston 10 according to the invention guaranteed become.

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 (10), en particulier en métal léger, comprenant :
    un fût de piston (16),
    une zone supérieure (14) essentiellement cylindrique,
    des moyeux de goujons (24) en retrait en direction de l'axe de goujon (28) vers l'axe du piston (30),
    deux tronçons de parois de fût (16) ainsi réalisés dans une région inférieure de la zone essentiellement cylindrique (14) sur des côtés radialement opposés par rapport à l'axe de goujon (28), et
    deux parois de liaison (18) reliant les tronçons de parois de fût (16), lesdites parois étant en retrait et s'étendant jusqu'à la bordure inférieure du fût de piston, et les moyeux de goujons (24) étant situés dans lesdites parois,
    caractérisé en ce que :
    les deux tronçons de parois de fût (16) sont réalisés sous forme de tronçons de parois porteurs, et en ce que celles des régions qui n'apportent aucune contribution au soutien du piston (10) contre la paroi intérieure du cylindre sont évidées,
    les deux tronçons de parois de fût (16) comportent des bordures latérales (20, 22) réalisées sous une forme incurvée quelconque, et les deux tronçons de parois de fût sont réalisés de manière à se rétrécir vers le haut et d'une manière largement identique en ce qui concerne leur dimension en direction périphérique, et
    les parois de liaison (18) suivent le tracé ainsi défini des bordures (20, 22), qui s'étendent en direction de l'axe de piston (30), des tronçons de parois de fût (16) de telle manière qu'elles sont inclinées l'une vers l'autre on direction du haut.
  2. Piston selon la revendication 1, caractérisé en ce que les tronçons de parois de fût (16) sont ainsi réalisés qu'ils assurent le support du piston (10) contre la paroi du cylindre, à titre de tronçons de parois de fût (16) porteurs dans la région de la totalité de leur surface extérieure.
  3. Piston selon l'une au moins des revendications 1 et 2, caractérisé en ce que les bordures latérales (20, 22) des tronçons de parois de fût porteur (16) sont réalisés de façon largement linéaire dans le tracé du rétrécissement.
  4. Piston selon l'une au moins des revendications 1 et 2, caractérisé en ce que les bordures latérales (20, 22) des tronçons de parois de fût porteurs (16) sont réalisés sous forme incurvée dans le tracé du rétrécissement, et en ce que les parois de liaison (18) sont réalisées de façon incurvée concave ou convexe pour ce qui concerne leur tracé en direction de l'axe de piston (30).
  5. Piston selon l'une au moins des revendications précédentes, caractérisé en ce que le piston (10) est creux au niveau de sa face inférieure (32) dans la zone supérieure (26) qui dépasse au-delà des moyeux de goujons (24) en retrait.
  6. Piston selon l'une au moins des revendications précédentes, caractérisé en ce que, pour l'utilisation avec une bielle à gradins, ou respectivement une bielle en trapèze, les moyeux de goujons (24) sont réalisés de telle manière au niveau de leurs côtés (34) tournés l'un vers l'autre que la distance entre les moyeux de goujons (24) dans une zone supérieure est inférieure à celle dans une zone infcrieurc.
EP97118337A 1996-10-23 1997-10-22 Piston allégé Expired - Lifetime EP0838587B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19643778 1996-10-23
DE19643778A DE19643778C2 (de) 1996-10-23 1996-10-23 Leichtbaukolben

Publications (3)

Publication Number Publication Date
EP0838587A1 EP0838587A1 (fr) 1998-04-29
EP0838587B1 true EP0838587B1 (fr) 2001-04-04
EP0838587B2 EP0838587B2 (fr) 2005-08-24

Family

ID=7809584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97118337A Expired - Lifetime EP0838587B2 (fr) 1996-10-23 1997-10-22 Piston allégé

Country Status (3)

Country Link
US (1) US6152017A (fr)
EP (1) EP0838587B2 (fr)
DE (2) DE19643778C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013000789A1 (fr) 2011-06-27 2013-01-03 Mahle International Gmbh Procédé de forgeage pour la fabrication d'un piston ou d'une jupe de piston

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19848649C5 (de) 1998-10-22 2008-11-27 Peter Greiner Kohlenstoffkolben für eine Brennkraftmaschine
DE19953384C1 (de) 1999-11-06 2001-01-18 Federal Mogul Wiesbaden Gmbh Kolben
DE10145589B4 (de) * 2001-09-15 2006-09-14 Ks Kolbenschmidt Gmbh Kolben für eine Brennkraftmaschine
ATE305088T1 (de) 2002-03-25 2005-10-15 Brp Rotax Gmbh & Co Kg Kolben
FR2854089B1 (fr) * 2003-04-23 2006-05-19 Semt Pielstick Procede de fabrication d'un piston, outillage pour la mise en oeuvre de ce procede et piston ainsi obtenu
KR100922213B1 (ko) * 2003-06-13 2009-10-20 엘지전자 주식회사 밀폐형 압축기
DE102005041001A1 (de) * 2005-08-29 2007-03-22 Ks Kolbenschmidt Gmbh Leichtbaukolben
DE102005041002A1 (de) * 2005-08-29 2007-03-01 Ks Kolbenschmidt Gmbh Leichtbaukolben
DE102005042857A1 (de) * 2005-09-08 2007-03-22 Ks Kolbenschmidt Gmbh Kolben für eine Brennkraftmaschine
BRPI0718657A2 (pt) 2006-11-08 2013-11-19 Federal Mogul Corp Conjunto de pistão
DE102007020447A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102007031581A1 (de) * 2007-07-06 2009-01-08 Ks Kolbenschmidt Gmbh Kolben einer Brennkraftmaschine mit einer erhöhten Schrägstellung der Kastenwände des Kolbens
DE102009059056A1 (de) 2009-12-18 2011-06-22 MAHLE International GmbH, 70376 Kolben für einen Verbrennungsmotor
DE102011115639A1 (de) * 2011-09-28 2013-03-28 Mahle International Gmbh Kolben für einen Verbrennungsmotor
DE102011115048A1 (de) * 2011-10-07 2013-04-11 Mahle International Gmbh Schmiedevorrichtung zur Herstellung eines Kolbenrohlings und Verfahren zur Herstellung des Kolbenrohlings unter Verwendung der Schmiedevorrichtung
US10184421B2 (en) 2012-03-12 2019-01-22 Tenneco Inc. Engine piston
WO2014047619A2 (fr) 2012-09-24 2014-03-27 Chris Rorres Procédés et appareil pour déplacer un fluide à l'aide d'une virure
CN105745426B (zh) * 2013-10-14 2019-09-03 Ks科尔本施密特有限公司 内燃机的活塞及其制造方法
IT201600130253A1 (it) * 2016-12-22 2018-06-22 Italia Wanbao Acc S R L Pistone per compressori ermetici
USD897373S1 (en) * 2018-09-22 2020-09-29 Chaoming Li Piston
USD1009938S1 (en) * 2022-05-24 2024-01-02 Reme, Llc Elliptical piston for a rotary steerable tool

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EP0171825A1 (fr) * 1984-07-14 1986-02-19 KOLBENSCHMIDT Aktiengesellschaft Piston en métal léger pour moteur à combustion interne
JPS6285152A (ja) * 1985-09-27 1987-04-18 Honda Motor Co Ltd ピストン
JPS6444346A (en) * 1987-08-10 1989-02-16 Suzuki Motor Co Method of controlling continuously variable transmission
EP0385390A1 (fr) * 1989-03-03 1990-09-05 Dott. Vittorio Gilardoni S.p.A. Piston allégé
JPH0389958A (ja) * 1989-09-01 1991-04-15 Mitsubishi Heavy Ind Ltd 電気集じん装置のパルス電源装置
US5058489A (en) * 1989-06-20 1991-10-22 Atsugi Unisia Corporation Piston structure for internal combustion engine

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DE3430258A1 (de) * 1984-08-17 1986-02-27 Mahle Gmbh, 7000 Stuttgart Tauchkolben fuer verbrennungsmotoren
GB8615808D0 (en) * 1986-06-27 1986-08-06 Ae Plc Pistons
DE3843761A1 (de) * 1988-12-24 1990-07-05 Mahle Gmbh Leichter tauchkolben fuer verbrennungsmotoren
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US5076225A (en) * 1989-12-28 1991-12-31 Toyota Jidosha Kabushiki Kaisha Piston for an internal combustion engine
DE4122921C2 (de) * 1990-07-18 1999-04-08 Mahle Gmbh Tauchkolben für Verbrennungsmotoren mit ballig ovaler Außenform des Kolbenschaftes
US5172626A (en) * 1991-08-22 1992-12-22 General Motors Corporation Stabilized piston skirt having varying peaks and concave surfaces
JPH0618642U (ja) * 1992-08-11 1994-03-11 株式会社ユニシアジェックス ピストン
DE4240050A1 (de) * 1992-11-28 1994-06-01 Mahle Gmbh Kolben-Zylinder-Vorrichtung eines Verbrennungsmotors
JPH06257507A (ja) * 1993-03-09 1994-09-13 Nissan Motor Co Ltd 内燃機関のピストン
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171825A1 (fr) * 1984-07-14 1986-02-19 KOLBENSCHMIDT Aktiengesellschaft Piston en métal léger pour moteur à combustion interne
JPS6285152A (ja) * 1985-09-27 1987-04-18 Honda Motor Co Ltd ピストン
JPS6444346A (en) * 1987-08-10 1989-02-16 Suzuki Motor Co Method of controlling continuously variable transmission
EP0385390A1 (fr) * 1989-03-03 1990-09-05 Dott. Vittorio Gilardoni S.p.A. Piston allégé
US5058489A (en) * 1989-06-20 1991-10-22 Atsugi Unisia Corporation Piston structure for internal combustion engine
JPH0389958A (ja) * 1989-09-01 1991-04-15 Mitsubishi Heavy Ind Ltd 電気集じん装置のパルス電源装置

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Title
H. Ötting:"Leichtbau im Anstriebsstrang", Expert-Verlag *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013000789A1 (fr) 2011-06-27 2013-01-03 Mahle International Gmbh Procédé de forgeage pour la fabrication d'un piston ou d'une jupe de piston

Also Published As

Publication number Publication date
US6152017A (en) 2000-11-28
DE19643778C2 (de) 2000-04-13
EP0838587B2 (fr) 2005-08-24
DE59703281D1 (de) 2001-05-10
DE19643778A1 (de) 1998-05-07
EP0838587A1 (fr) 1998-04-29

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