EP3589759A1 - Axe de piston pour moteurs à combustion interne, système, moteur et utilisation d'un tel axe de piston - Google Patents

Axe de piston pour moteurs à combustion interne, système, moteur et utilisation d'un tel axe de piston

Info

Publication number
EP3589759A1
EP3589759A1 EP18709988.2A EP18709988A EP3589759A1 EP 3589759 A1 EP3589759 A1 EP 3589759A1 EP 18709988 A EP18709988 A EP 18709988A EP 3589759 A1 EP3589759 A1 EP 3589759A1
Authority
EP
European Patent Office
Prior art keywords
piston pin
piston
gudgeon pin
ratio
internal combustion
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.)
Pending
Application number
EP18709988.2A
Other languages
German (de)
English (en)
Inventor
Ralf Meske
Roland Böhm
Klaus Lades
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
Application filed by Federal Mogul Nuernberg GmbH filed Critical Federal Mogul Nuernberg GmbH
Publication of EP3589759A1 publication Critical patent/EP3589759A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Definitions

  • the present invention relates to a piston pin for internal combustion engines, a piston pin and piston system, an engine with a piston pin or with a system of piston pin and piston and the use of a piston pin or a system of piston pin and piston for engines, especially internal combustion engines.
  • piston pins for internal combustion engines are predominantly made of steels 16MnCr5 and 17Cr3, which are also subjected to case hardening.
  • the production of piston pins made of hardened steel is described generally in DE 950297 B, for example.
  • An object of the present invention is to provide a piston pin with reduced mass, while the functional properties of the piston pin should not be adversely affected.
  • the piston pin for internal combustion engines according to the invention consists of a case hardened steel and is characterized in that a ratio of a residual wall thickness of the piston pin to a total thickness of a case hardening layer is ⁇ 2 and further comprises a ratio of inner diameter and outer diameter of the piston pin> 60%.
  • the piston pin according to the invention is preferably the usual expert understanding following - a hollow cylindrical, elongate member which serves to fasten the piston and connecting rod and is guided by appropriately designed openings this. It also serves to realize the power transmission between pin bosses of the piston and the connecting rod. Accordingly, the piston pin according to the invention preferably consists exclusively of this hollow cylindrical, elongated component.
  • the piston pin can be described in cross section through an inner diameter and an outer diameter.
  • the differential amount of outer diameter and inner diameter divided by 2 further defines the wall thickness of the piston pin.
  • the piston pin of the present invention stands out from the prior art in that the difference between outer diameter and inner diameter is smaller than usual.
  • the inner diameter of the piston pin is more than 60% of the outer diameter, usually it is significantly less than 60%.
  • the present invention is not limited to any upper limit of this value.
  • inner diameters are also significantly greater than 60%.
  • the inner diameter is more than 60% up to and including 80%, whereby the 80% can be regarded as a technically reasonable but not limiting upper limit.
  • the piston pin according to the invention further consists of a case hardened steel, which - according to the normal understanding of the skilled person - means that the
  • Piston pin material must first be a suitable case-hardenable material, which can be subjected to the usual process steps of case hardening: carburizing, hardening / quenching and tempering and from which the piston pin according to the invention is produced by conventional manufacturing methods.
  • a defined ratio of a residual wall thickness of the piston pin ie non-case-hardened material and non-case-hardened piston pin thickness portion
  • a total thickness of a case hardening layer ie sum of the depths / thicknesses of the piston pin wall with case hardening
  • case hardening depth for bolts is in accordance with ISO 18669-1
  • case hardening is carried out directly on the hollow cylindrical piston pin, usually in the rough state, by conventional methods, which means that a case hardening layer can be applied from the outside as well as from the outside
  • the piston pin according to the invention thus preferably has an outer and inner case hardening, which is generated from the outer and inner surface of the piston pin .
  • the case hardening then extends from the piston pin outer and piston pin inside surfaces in the depth of the
  • the ratio of the cumulative thickness / depth extension of these case hardened layers compared to the portion of the total wall thickness described above that is substantially non-case hardened is then less than 2.
  • the case-hardened piston pin wall area or the case-hardened layer should have a certain minimum thickness overall.
  • the present invention is not limited to the retention of an uncured "core" of the piston pin wall.Also conceivable is a nearly or fully through hardened piston pin wall, which may result in particular with comparatively large inner diameters, ie, particularly thin-walled gudgeon pin according to the present invention
  • the invention is not limited to identical outside and inside case hardening depths of the piston pin wall or layer thicknesses of case hardening Adjusting specific loads on the outside and the inside of the piston pin and adjust if necessary different optionally also includes that the outside or inside of the piston pin is uncured.
  • the piston pin is not a hybrid (piston) bolt.
  • the piston pin according to the invention consists only of the hollow-cylindrical, sleeve-like component described here and not additionally, as usual with hybrid bolts, other (incorporated therein) components / components, for example, cores or inserts.
  • the piston pin according to the invention is preferably free of use, i. has no further component (insert) inserted in the hollow cylindrical bolt, and is furthermore preferably in one piece.
  • the piston pin described here in total can have at least one inner bevel or be provided with it. This achieves a further weight reduction.
  • a preferred lower limit for the thickness ratio is about 1.0. At least in concrete terms, the ranges from 1.0 to ⁇ 2.0, 1.0 to ⁇ 1.5 and 1.5 to are included
  • case hardened steel of the piston pin of the present invention is a case steel selected from the group consisting of: 18CrNi8, 18CrNiMo7-6, 20MnCr5 and 20MnCrS5.
  • the present invention further deviates from the prior art, wherein usually steel grades 17Cr3 and 16MnCr5 are used.
  • the piston pin according to the invention has a surface coating of DLC, ta-C or MoN. This can be provided as needed on all relevant surfaces of the piston pin, for example on the outside and / or inside.
  • the piston pin is advantageously provided e.g. Protected against wear in the piston hub and positively influenced tribological interactions between the system components of the piston group.
  • Another object of the present invention is to provide a system of piston pins and pistons.
  • the system according to the invention has the above-described piston pin in all its possible and preferred embodiments and a piston, wherein the piston has a piston hub with a transverse ovality, ie the diameter of the piston hub perpendicular to the cylinder axis is larger by a certain amount than the diameter in Direction of the cylinder axis.
  • the thus defined transverse ovality ideally corresponds to the ovalization of the piston pin under maximum ignition pressure.
  • the piston pin according to the invention can have a certain ovalization during operation due to its increased diameter ratio or its reduced wall thickness, but its bending behavior remains similar to conventional piston pins.
  • the ovalization can be understood as an elliptical deviation from a circular cross-section of the piston pin. This change in the cross-sectional shape of the piston pin is due to the durability of the interacting piston hub / piston pin bore through
  • the system according to the invention thus enables either a reduction of the overall system weight and the dynamic masses with the advantages derived therefrom or, while maintaining the overall system weight, a reinforcement of the piston, which i.a. the overall reliability of the system increases.
  • transverse ovality of the piston hub is> 0.1% of a piston hub diameter and is particularly advantageous in terms of operational stability of the piston hub in interaction with the piston pin according to the invention.
  • the piston pin has a reduced length.
  • the piston pin in its length of conventional Piston pin deviates.
  • the advantage of this is that with the shortening of the piston pin, a further reduction of the piston pin mass and thus also of the entire system of piston pin and piston is accompanied.
  • Another component of the present invention is an engine, in particular an internal combustion engine, having the piston pin or the system of piston pin and piston according to the present invention.
  • the final component of the present invention is still the use of the piston or the system according to the invention of piston pin and piston for and in engines, in particular internal combustion engines. Both for the engine itself, as well as for the aforementioned use, all the advantages of the piston pin described above and the system of piston pin and piston are realized and used.
  • a concrete weight-reduced piston pin for a diesel engine according to the present invention is thus made of 20MnCr5, has an outer diameter of about 30 mm, an inner diameter of about 19.5 mm, a length of about 68 mm and a weight of about 0.218 kg. This results in a diameter ratio of about 65% and a weight reduction to a piston pin, which has only a different inner diameter of about 16.8 mm, of about 11%.
  • the above piston type may have a piston pin outside case depth (500 HV) of about 1.08 mm and a piston pin inside case depth (500 HV) of about 1.06 mm. This then results in a ratio of residual wall thickness of the piston pin to the total thickness of the two-sided härte für of about 1.45. Furthermore, a surface hardness of the piston pin about 82 HRA and a core hardness of the piston pin, so in the western non-use hardened middle zone in the piston pin wall of about 43 HRC.
  • Another concrete weight-reduced piston pin for a gasoline engine according to the present invention is thus made of 20MnCr5, has an outer diameter of about 22 mm, an inner diameter of about 14.5 mm, a length of about 52 mm and a weight of about 0, 088 kg on. This results in a diameter ratio of about 66% and a weight reduction to a piston pin, which has only a different inner diameter of about 12 mm, of about 14.6%.
  • Two further concrete preferred embodiments of piston pin according to the invention are made of 20MnCr5 and each have an outer diameter of 20 mm and an inner diameter of 14.3 mm and a length of 54 mm.
  • the inner diameter of the piston is about 72% of the outer diameter.
  • a first of these piston pins has a piston bolt outside case depth (500 HV) of about 0.65 mm and a piston pin inside case depth (500 HV) of about 0.66 mm.
  • values of about 0.70 mm and about 0.72 mm result in this regard. This in turn results in ratios of residual wall thickness of the piston pin to the total thickness of the two-sided case hardening layer of about 1.18 or about 1.01.
  • the first piston pin also has a surface hardness of about 79 HRA and a core hardness of about 47 HRA. For the second piston pin these values are 80 HRA and 40 HRC.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne un axe de piston pour des moteurs à combustion interne, qui est constitué par un acier cémenté et qui est caractérisé par un rapport d'une épaisseur de paroi résiduelle de l'axe de piston à une épaisseur totale d'une couche cémentée < 2 et un rapport du diamètre interne au diamètre externe de l'axe de piston > 60 %. En outre, la présente invention concerne un système constitué par l'axe de piston selon l'invention et par un piston, le piston présentant un moyeu de piston d'une ovalisation transversale qui correspond à une ovalisation de l'axe de piston sous une pression d'allumage maximale. L'invention comprend également un moteur, en particulier à moteur à combustion interne, présentant l'axe de piston ou le système constitué par l'axe de piston et le piston ainsi qu'une utilisation correspondante pour des moteurs, en particulier des moteurs à combustion interne.
EP18709988.2A 2017-03-02 2018-03-02 Axe de piston pour moteurs à combustion interne, système, moteur et utilisation d'un tel axe de piston Pending EP3589759A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017203418.1A DE102017203418A1 (de) 2017-03-02 2017-03-02 Kolbenbolzen für Verbrennungsmotoren, System aus Kolbenbolzen und Kolben, Motor mit Kolbenbolzen oder mit System aus Kolbenbolzen und Kolben und Verwendung eines Kolbenbolzens oder eines Systems aus Kolbenbolzen und Kolben für Motoren
PCT/EP2018/055160 WO2018158419A1 (fr) 2017-03-02 2018-03-02 Axe de piston pour moteurs à combustion interne, système, moteur et utilisation d'un tel axe de piston

Publications (1)

Publication Number Publication Date
EP3589759A1 true EP3589759A1 (fr) 2020-01-08

Family

ID=61616982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18709988.2A Pending EP3589759A1 (fr) 2017-03-02 2018-03-02 Axe de piston pour moteurs à combustion interne, système, moteur et utilisation d'un tel axe de piston

Country Status (7)

Country Link
US (1) US20200003305A1 (fr)
EP (1) EP3589759A1 (fr)
JP (1) JP2020511617A (fr)
CN (1) CN110621795A (fr)
BR (1) BR112019017999A2 (fr)
DE (1) DE102017203418A1 (fr)
WO (1) WO2018158419A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020209624A1 (de) 2020-07-30 2022-02-03 Federal-Mogul Nürnberg GmbH Kolben und Kolbenbolzen und Verfahren zur Herstellung und Verbrennungsmotor mit einem solchen Kolben und/ oder Kolbenbolzen

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1909553A (en) 1930-07-09 1933-05-16 Nathan H Schermer Manufacture of carburized articles
US2730472A (en) * 1952-05-07 1956-01-10 Ohio Crankshaft Co Method of manufacturing hollow tubular articles
DE950297C (de) 1952-05-07 1956-10-04 Ohio Crankshaft Company Verfahren zur Herstellung hohler, rohrfoermiger Gegenstaende aus gehaertetem Stahl, z. B. Kolbenbolzen
US2990226A (en) * 1958-03-05 1961-06-27 Caterpillar Tractor Co Piston
DE1650206A1 (de) * 1967-08-18 1970-08-20 Schmidt Gmbh Karl Kolbenbolzenlagerung
US4210468A (en) * 1978-08-17 1980-07-01 Amsted Industries Incorporated Piston pin and method for making such
JPS60178344U (ja) * 1984-05-09 1985-11-27 三菱自動車工業株式会社 ピストン構造
JPH0694127A (ja) * 1992-09-16 1994-04-05 Toyota Motor Corp ピストンピンの軸受構造
JPH06271983A (ja) * 1993-03-18 1994-09-27 Kobe Steel Ltd 成形性および曲げ強度の優れた高強度ピストンピン
DE20116978U1 (de) * 2001-10-16 2003-02-27 Winklhofer & Soehne Gmbh Gelenkkette
DE102009056920A1 (de) 2009-12-03 2011-06-09 Mahle International Gmbh Bolzennaben eines Kolbens für einen Verbrennungsmotor
DE202009014904U1 (de) 2009-12-22 2010-05-12 A.G. Porta S.P.A., Beinasco Kolbenbolzen für einen Verbrennungsmotor
RU2410590C1 (ru) * 2009-12-23 2011-01-27 Закрытое акционерное общество "Научно-Производственная Компания "Технология машиностроения и Объемно-поверхностная закалка" Поршневой палец
DE102010050345A1 (de) 2010-11-05 2012-05-10 Mahle International Gmbh Hybridbolzen zur Verbindung eines Kolbens für einen Verbrennungsmotor mit einem Pleuel und Pressvorrichtung zur Herstellung des Hybridbolzens
CN104481719A (zh) * 2014-11-21 2015-04-01 余姚市舒春机械有限公司 冷挤压高精度汽油机活塞销

Also Published As

Publication number Publication date
WO2018158419A1 (fr) 2018-09-07
US20200003305A1 (en) 2020-01-02
JP2020511617A (ja) 2020-04-16
DE102017203418A1 (de) 2018-09-06
BR112019017999A2 (pt) 2020-04-28
CN110621795A (zh) 2019-12-27

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