EP0449848B1 - Pisotn plongeur leger pour moteurs a combustion interne - Google Patents

Pisotn plongeur leger pour moteurs a combustion interne Download PDF

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Publication number
EP0449848B1
EP0449848B1 EP89912953A EP89912953A EP0449848B1 EP 0449848 B1 EP0449848 B1 EP 0449848B1 EP 89912953 A EP89912953 A EP 89912953A EP 89912953 A EP89912953 A EP 89912953A EP 0449848 B1 EP0449848 B1 EP 0449848B1
Authority
EP
European Patent Office
Prior art keywords
piston
region
shaft
pressure side
counterpressure
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
EP89912953A
Other languages
German (de)
English (en)
Other versions
EP0449848A1 (fr
Inventor
Emil Ripberger
Jürgen Ellermann
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.)
Mahle GmbH
Original Assignee
Mahle 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
Priority claimed from DE3843761A external-priority patent/DE3843761A1/de
Priority claimed from DE3843866A external-priority patent/DE3843866A1/de
Application filed by Mahle GmbH filed Critical Mahle GmbH
Publication of EP0449848A1 publication Critical patent/EP0449848A1/fr
Application granted granted Critical
Publication of EP0449848B1 publication Critical patent/EP0449848B1/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
    • 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
    • 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
    • F02F3/022—Pistons  having means for accommodating or controlling heat expansion the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • the invention relates to a lightweight plunger for internal combustion engines according to the preamble of claim 1.
  • the object of the invention is to improve the noise behavior of such a piston with the lowest possible weight and small dimensions in engine operation. At the same time, the piston should generate as little friction loss as possible during engine operation.
  • the solution for the piston according to WO 88/08078 is to allow the piston to run obliquely with respect to its piston head in operating states in which the piston has not yet reached its temperature given in the nominal power mode.
  • the piston skirt is provided with a corresponding contour, which changes as the operating heat rises of the piston changed so that the piston head is aligned parallel to the engine cylinder axis in the nominal power operation of the piston.
  • the oblique position of the piston head at low temperature, which is given in the partial load range of the engine, is aimed at so that the piston head on the side on which it tends to strike the cylinder wall as a result of its tilting movement is kept as far away from the cylinder wall as possible can.
  • the danger of striking the cylinder wall exists above all on the counter pressure side, which is why the piston head is inclined so that on the counter pressure side there is a greater distance between the top land and the cylinder wall than on the pressure side.
  • the slot below the lowermost piston ring groove is provided in that known piston on the counter-pressure side in order to interrupt the flow of heat from the hot piston head into the underlying shaft area on that side. Such an interruption of the heat flow is necessary so that the shaft at the upper end expands radially outward as little as possible.
  • the control strip attached to the upper piston end on the counterpressure side with a lower coefficient of thermal expansion than the shaft material also serves in that known piston.
  • the combined measure of the slot and the thermal expansion-inhibiting control strip makes it possible for that piston to change the shaft contour on the counterpressure side in the direction of the connecting rod oscillation plane (plane, which is spanned in the piston axis and is perpendicular to the piston pin axis), which swivels the piston head into a position parallel to the cylinder axis with increasing piston temperature.
  • plane which is spanned in the piston axis and is perpendicular to the piston pin axis
  • the invention provides a generic piston with the characterizing features of claim 1.
  • the piston skirt on the counter-pressure side is designed to be somewhat more flexible overall radially than on the pressure side.
  • the running play on the counterpressure side compared to the cylinder running surface can be chosen to be less than on the pressure side.
  • the longer shaft on the pressure side compared to the counter pressure side has the following effects in engine operation:
  • the bolt axis is offset to the pressure side, causing a tilting moment which brings the piston into contact with the cylinder on its top land on the counter-pressure side.
  • the longer shaft prevents the top land from striking in this way and thus increases piston noise.
  • a piston is known from EP-A-0211189, the shaft of which can be designed as a whole asymmetrically as desired.
  • the objective according to the invention is not addressed and certainly not solved in a comparable manner.
  • the piston there does not have a horizontal slot between the piston head and the shaft on the counterpressure side. Such a slot is, however, absolutely necessary to achieve the result according to the invention.
  • the piston according to that document lacks the additional measures (c) and (d) of the present patent claim 1 for the success according to the invention.
  • a piston described in EP-A-0209006, in which the ovalities of the shaft on the pressure side and counter-pressure side are designed differently, is not comparable to the piston according to the invention because there is no combination of features comparable to the invention.
  • the piston according to FIG. 1 has a longer shaft on the pressure side DS than the counter pressure side GDS.
  • the wall thickness of the stem on the pressure side DS is greater than on the counter pressure side GDS, on which a horizontal slot separates the stem from the piston head within the lowest ring groove.
  • the slot and the thinner wall thickness of the shaft ensure a certain elastic flexibility on the counter pressure side GDS, which should not be present on the pressure side.
  • control strips inserted in the interior of the piston skirt of the piston according to FIG. 1 enable the skirt to be guided more closely when the piston is cold.
  • the play between the upper shaft and cylinder area there in the cold state can be set lower than in the relevant shaft area on the pressure side.
  • the straight lines O in FIGS. 4 and 5 indicate the cylinder track for the piston.
  • the play between the piston skirt and the cylinder surface is zero.
  • the distance between the curves GR, GB, DR and DB on the one hand and the straight line O on the other hand means the play of the piston running surface against the cylinder running surface.
  • the curvature of the curves DR, DB and GR, GB corresponds to the respective piston outer shape.
  • the piston skirt on the counter pressure side has less crowning in the upper skirt area than in the comparable area on the pressure side. Tighter guidance on the counter-pressure side is possible due to the overall more flexible design of the piston skirt on this piston side.
  • the higher flexibility is achieved on the one hand by a horizontal slot between the stem and the piston head and on the other hand by the greater ovality of the piston skirt in the circumferential direction.
  • the flexibility of the can be increased Piston shaft on the counter pressure side also in that the shaft thickness there is less than in the corresponding area on the pressure side.
  • the piston according to FIG. 3 In order to be able to center the piston according to FIG. 3 both in the head and shaft area, it is designed to be symmetrical axially at heights A and B on its outer surface at least in regions.
  • the stretch-regulating insert strip indicated by the dot-dash line in FIG. 3 lies axially on the counter pressure side higher than the upper shaft edge than on the pressure side.
  • the ribs in the area of the pressure side of the piston can be made more solid and thus more stable than the ribs in question on the counter pressure side. It is also possible that such ribs are only attached to the pressure side of the hubs, which are otherwise freely formed on the piston crown, while they can be entirely absent on the counter-pressure side.

Abstract

Un piston plongeur de poids et de dimensions aussi réduits que possible fonctionne avec le moins de bruit possible. A cet effet, la partie supérieure de la tige du piston est séparée de la tête du piston par une fente horizontale ménagée du côté contre-pression d'un plan qui traverse l'axe longitudinal du piston et de l'axe de piston. En outre, la tige peut être plus longue du côté pression que du côté contre-pression.

Claims (3)

  1. Piston plongeur léger pour moteurs à combustion interne, pour des moteurs à allumage par étincelle de voitures particulières, notamment, de dimensions:
    L/D = 0,45 - 0,8
    H/D = 0,25 - 0,5
    A/D = 0,3 - 0,5
    T/D = 0,45 - 0,8
    avec
    L =   longueur maximale du piston
    D =   diamètre maximal du piston
    H =   hauteur de compression
    A =   hauteur de tige maximale au-dessous de la rainure de segment inférieure, dans une zone périphérique d'une hauteur de tige à peu près égale, de 45 au moins, sur le côté pression du piston, pour une répartition à peu prés symétrique de cette zone de part et d'autre d'un plan fixé à la perpendiculaire de l'axe de piston et se situant au travers de l'axe longitudinal du piston,
    T =   écartement diamétral mutuel des extrémités d'alésages de moyeux, situées dans le sens radial externe,
    et avec une tige ovale dans le sens périphérique, bombée dans le sens de l'axe du piston, dotée d'un axe d'ovalité supérieur dans le sens pression/contre-pression, et uniquement séparée du fond de piston, dans sa zone placée contre-pression (zone GDS), par une fente horizontale, et avec, notamment, un axe des alésages de moyeux pour l'axe de piston, légèrement en déport par rapport au côté pression du piston (déséquilibre axial de l'axe du tourillon de pied de bielle), caractérisé en ce que:
    a) la tige de piston présente dans le plan polaire (plan perpendiculaire à l'axe du piston) une ovalité plus élevée, dans la zone de contre-pression, que dans la zone côté pression,
    b) la tige, située dans la zone de contre-pression, est moins bombée dans sa zone supérieure, limitrophe à la rainure de segment inférieure, que dans la zone côté pression,
    c) la tige est plus longue dans la zone côté pression que dans la zone côté contre-pression,
    d) l'épaisseur de paroi côté pression est supérieure à celle côté contre-pression.
  2. Piston plongeur suivant la revendication 1, caractérisé en ce q'un insert en forme de bande régulateur de la dilatation, situé dans le sens périphérique de la tige, est prévu dans la zone côté contre-pression de la tige, cet insert se composant d'un matériau, dont le coefficient de dilatation thermique est inférieur à celui du matériau de la tige.
  3. Piston plongeur suivant la revendication 2, caractérisé par un insert en forme de bande régulateur de la dilatation, côté pression, qui présente, par rapport à l'insert côté contre-pression, une distance plus élevée par rapport à l'extrémité supérieure de la tige.
EP89912953A 1988-12-24 1989-11-29 Pisotn plongeur leger pour moteurs a combustion interne Expired - Lifetime EP0449848B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3843761A DE3843761A1 (de) 1988-12-24 1988-12-24 Leichter tauchkolben fuer verbrennungsmotoren
DE3843866 1988-12-24
DE3843866A DE3843866A1 (de) 1988-12-24 1988-12-24 Leichter tauchkolben fuer verbrennungsmotoren
DE3843761 1988-12-24

Publications (2)

Publication Number Publication Date
EP0449848A1 EP0449848A1 (fr) 1991-10-09
EP0449848B1 true EP0449848B1 (fr) 1994-02-09

Family

ID=25875633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89912953A Expired - Lifetime EP0449848B1 (fr) 1988-12-24 1989-11-29 Pisotn plongeur leger pour moteurs a combustion interne

Country Status (7)

Country Link
US (1) US5158008A (fr)
EP (1) EP0449848B1 (fr)
JP (1) JP2983621B2 (fr)
KR (1) KR970003153B1 (fr)
BR (1) BR8907852A (fr)
DE (1) DE58906955D1 (fr)
WO (1) WO1990007642A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3931949A1 (de) * 1989-09-25 1991-04-04 Alcan Gmbh Kolben fuer einen verbrennungsmotor
DE4110306A1 (de) * 1990-09-20 1992-03-26 Mahle Gmbh Tauchkolben aus leichtmetall fuer ottomotoren
JPH06257507A (ja) * 1993-03-09 1994-09-13 Nissan Motor Co Ltd 内燃機関のピストン
DE4326978A1 (de) * 1993-08-11 1995-02-16 Alcan Gmbh Kolben für Brennkraftmaschinen, insbesondere für Dieselmotoren
JP3541511B2 (ja) * 1995-07-07 2004-07-14 いすゞ自動車株式会社 ピストン
DE19643778C2 (de) * 1996-10-23 2000-04-13 Alcan Gmbh Leichtbaukolben
WO2007056044A1 (fr) * 2005-11-03 2007-05-18 Dresser, Inc. Piston
US7302884B2 (en) * 2005-11-03 2007-12-04 Dresser, Inc. Piston
US7293497B2 (en) * 2005-11-03 2007-11-13 Dresser, Inc. Piston
US8807109B2 (en) * 2009-11-06 2014-08-19 Federal-Mogul Corporation Steel piston with cooling gallery and method of construction thereof
US9970384B2 (en) * 2009-11-06 2018-05-15 Federal-Mogul Llc Steel piston with cooling gallery and method of construction thereof
US9470311B2 (en) 2012-06-14 2016-10-18 Mahle International Gmbh Lightweight engine power cell assembly
KR101936468B1 (ko) * 2016-10-11 2019-01-08 현대자동차주식회사 윤활성능 개선을 위한 피스톤 어셈블리
CN214787659U (zh) * 2020-11-20 2021-11-19 浙江春风动力股份有限公司 一种水冷式摩托车发动机及采用该发动机的摩托车

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1499073A (en) * 1919-09-04 1924-06-24 Aluminum Co Of America Piston
GB1256242A (en) * 1968-09-05 1971-12-08 Ass Eng Ltd Improvements in pistons
US3908521A (en) * 1972-07-31 1975-09-30 Hepworth & Grandage Ltd Pistons for internal combustion engines or for compressors
JPS601942B2 (ja) * 1982-04-15 1985-01-18 三菱マテリアル株式会社 高温特性のすぐれた切削工具および耐摩耗工具用焼結材料
DE3430132A1 (de) * 1984-08-16 1986-02-27 Mahle Gmbh, 7000 Stuttgart Aluminium-tauchkolben fuer verbrennungsmotoren mit regelstreifen
DE3430258A1 (de) * 1984-08-17 1986-02-27 Mahle Gmbh, 7000 Stuttgart Tauchkolben fuer verbrennungsmotoren
IT1182507B (it) * 1985-07-12 1987-10-05 Ae Borgo Spa Pistoni con profilo asimmetrico per motori a combustione interna
DE3527032A1 (de) * 1985-07-27 1987-01-29 Mahle Gmbh Tauchkolben, insbesondere fuer verbrennungsmotoren
DE3820473C2 (de) * 1986-12-18 1998-03-26 Mahle Gmbh Leichter Tauchkolben für Verbrennungsmotoren
US5048398A (en) * 1986-12-23 1991-09-17 Mahle Gmbh Single, light-weight and low friction light-metal piston for internal-combustion engines
US5000078A (en) * 1987-04-18 1991-03-19 Mahle Gmbh Light metal trunk piston for internal combustion engines
JPS6457461A (en) * 1987-08-28 1989-03-03 Canon Kk Recorder

Also Published As

Publication number Publication date
WO1990007642A1 (fr) 1990-07-12
JPH04502501A (ja) 1992-05-07
US5158008A (en) 1992-10-27
EP0449848A1 (fr) 1991-10-09
KR970003153B1 (ko) 1997-03-14
BR8907852A (pt) 1991-10-08
JP2983621B2 (ja) 1999-11-29
DE58906955D1 (de) 1994-03-24
KR910700404A (ko) 1991-03-15

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