EP1719900A1 - Piston à haute densité d'alliage en métal pour le moteur à combustion interne et le procédé pour fabriquer un tel piston - Google Patents

Piston à haute densité d'alliage en métal pour le moteur à combustion interne et le procédé pour fabriquer un tel piston Download PDF

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Publication number
EP1719900A1
EP1719900A1 EP05425291A EP05425291A EP1719900A1 EP 1719900 A1 EP1719900 A1 EP 1719900A1 EP 05425291 A EP05425291 A EP 05425291A EP 05425291 A EP05425291 A EP 05425291A EP 1719900 A1 EP1719900 A1 EP 1719900A1
Authority
EP
European Patent Office
Prior art keywords
piston
main body
metal alloy
density metal
closing member
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
EP05425291A
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German (de)
English (en)
Other versions
EP1719900B1 (fr
Inventor
Gino Bona
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.)
PISTAL RACING Srl
Original Assignee
PISTAL RACING Srl
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=35094273&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1719900(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by PISTAL RACING Srl filed Critical PISTAL RACING Srl
Priority to DE602005001446T priority Critical patent/DE602005001446T2/de
Priority to AT05425291T priority patent/ATE365272T1/de
Priority to ES05425291T priority patent/ES2288735T3/es
Priority to EP05425291A priority patent/EP1719900B1/fr
Publication of EP1719900A1 publication Critical patent/EP1719900A1/fr
Application granted granted Critical
Publication of EP1719900B1 publication Critical patent/EP1719900B1/fr
Revoked 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • 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 
    • F02F3/0084—Pistons  the pistons being constructed from specific materials
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the present invention refers to a high-density metal alloy piston for internal combustion engines; the present invention further refers to a process for manufacturing a high-density metal alloy piston for internal combustion engines.
  • Pistons are traditionally manufactured in a single piece from an aluminium alloy through stamping or melting. Recently, however, there has been a development in the art for internal combustion engines with very high performance characterised by specific very high outputs: this in particular is the case for diesel engines, both due to the introduction of direct injection, common rail or multi-jet technologies, and for providing a response to future requirements imposed by anti-pollution laws against CO 2 emission. Consequently, thermal and mechanical stresses have dramatically increased, to which engine parts, and in particular pistons, are subjected. This in particular is the case for direct injection diesel engine pistons in which the high gas-oil injection pressures into the combustion chamber and in particular against the piston crown, make now traditional aluminium-made pistons fragile and scarcely reliable, if not even unusable.
  • pistons made of an aluminium alloy have been proposed that are equipped with reinforcing ceramics fiber, steel inserts to reduce their thermal expansion, having external liners covered with deposits with solid lubricants for reducing the sliding friction in the cylinder, subjected to particular mechanical workings for realising cooling channels to allow recirculation of air or oil in order to keep the piston at an acceptable operating temperature: it is however clear that all above-stated arrangements generate an unavoidable increase of piston costs, consequently making them scarcely attractive.
  • US-A-2004129243 discloses a steel piston made in a single piece from a billet taken from a condition included between a temperature in which it is in a solid state and a temperature in which it is in a liquid state and moulded through thixo-forging.
  • This arrangement however produces a piston that has scarce accessibility to the necessary tools for following workings, for example in order to further reduce its mass by removing excess material from inside it, thereby still resulting lower from the performance point of view than those that are the possible potentials of steel pistons associated with high-performance engines.
  • object of the present invention is providing a piston made of a high-density metal alloy for internal combustion engines that is able to support, with respect to traditional pistons made of an aluminimum alloy or to known steel pistons, quite higher pressures and thermal stresses with a relevant combustion improvement, a consequent reduction of polluting emissions and a higher use reliability.
  • Another object of the present invention is providing a process for manufacturing a high-density metal alloy piston for internal combustion engines with high efficiency.
  • the high-density metal alloy piston for internal combustion engines is composed of a main body 10 in a single piece, having an external sliding skirt 19 along an engine cylinder, typically equipped with at least one seat 17 for inserting an elastic sealing band (not shown) and with a closing member 30, mentioned below, adapted to operate as piston crown when joined to the main body 10.
  • the high-density metal alloy of which the piston according to the present invention is made is preferably an alloyed carbon steel equipped with mechanical and physical characteristics that are adequate for its use, but it is clear that, as an alternative, other alloys can be used that have similar properties suitable for its purposes.
  • the main body 10 is equipped with a central recess 12 next to the piston crown that operates as fuel entry and combustion chamber; between the central recess 12 and the skirt 19, a circular recess 14 is defined for internal cooling; from the circular recess 14, two ducts 16a, 16b depart, that are orthogonal to a seat 18 for inserting a pin (not shown) and are longitudinal to the piston stroke direction; through the circular recess 14 and the two ducts 16a, 16b, it is possible to advantageously proceed with internal mechanical workings of the piston following its moulding, being able to access, for removing material, to areas that are inaccessible in known monolithic pistons, allowing to obtain a piston made of an aluminium alloy, but with quite higher thermal and mechanical characteristics.
  • the circular recess 14 and the two ducts 16a, 16b further allow the oil sprayed by engine basement jets to produce a homogeneous cooling thereof, making thereby possible to accurately check the engine operating temperature, in addition to a correct lubrication of piston pin and skirt 19.
  • the piston according to the present invention can further be equipped with at least other two weight-reducing recesses 21a, 21b that are parallel to the pin-inserting seat 18 and orthogonal to the piston stroke direction, that define a sliding portion 23 for settling the piston stroke itself in the piston own cylinder passing between the two ducts 16a, 16b, such two weight-reducing recesses 21a, 21b communicating with the two ducts 16a, 16b and with the circular recess 14.
  • the closing member 30 shown in FIG. 5 and 6 is an annular body that is preferably made of the same metal alloy with which the main body 10 is produced, adapted to be joined to the main body 10 itself for covering the circular recess 14 and with a central hole 25 thereof that is concentric with the central recess 12 in order to realise the piston crown and leave the central recess 12 open.
  • the closing member 30 can be joined to the main body 10 once having ended the mechanical working steps of the main body 10 itself, allowing an easy access of tools inside it for an optimum removal of excess material, obtaining a high global weight-reduction of the piston with respect to what is known in the art.
  • Obviosuly the closing member 30 can be joined to the main body 10 through the most appropriate techniques, such as for example through spot welding or welding with beads that are internal and/or external to the circular recess 14.
  • the piston according to the present invention thereby allows reaching a weight that is equal or lower than a piston made of an aluminium alloy with high operating advantages for the following reasons:
  • the piston according to the present invention given the mechanical and thermal resistance of the high-density metal alloy of which it is made, can allow an increase of fuel injection pressure without requiring further different arrangements, though keeping high efficiency and reliabiity levels.
  • metal fibers are uninterrupted and can be distributed in order to reinforce in spots with higher fatigue and tension, thereby allowing to realise a piston equipped with greater mechanical and therma resistance.
  • the piston according to the present invention finds its wider application in the field of diesel engines, even if it is obvious that it can advantageously be used in internal combustion engines supplied with different fuels.
  • the present invention further deals with a process for manufacturing a high-density metal alloy piston for internal combustion engines, comprising the steps of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP05425291A 2005-05-04 2005-05-04 Piston à haute densité d'alliage en métal pour le moteur à combustion interne et le procédé pour fabriquer un tel piston Revoked EP1719900B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE602005001446T DE602005001446T2 (de) 2005-05-04 2005-05-04 Kolben aus einer hochdichten metallischen Legierung für einen Verbrennungsmotor und Verfahren zur Herstellung eines solchen Kolbens
AT05425291T ATE365272T1 (de) 2005-05-04 2005-05-04 Kolben aus einer hochdichten metallischen legierung für einen verbrennungsmotor und verfahren zur herstellung eines solchen kolbens
ES05425291T ES2288735T3 (es) 2005-05-04 2005-05-04 Piston de aleacion metalica de alta densidad para motor de combustion interna y procedimiento para fabricar un piston de este tipo.
EP05425291A EP1719900B1 (fr) 2005-05-04 2005-05-04 Piston à haute densité d'alliage en métal pour le moteur à combustion interne et le procédé pour fabriquer un tel piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425291A EP1719900B1 (fr) 2005-05-04 2005-05-04 Piston à haute densité d'alliage en métal pour le moteur à combustion interne et le procédé pour fabriquer un tel piston

Publications (2)

Publication Number Publication Date
EP1719900A1 true EP1719900A1 (fr) 2006-11-08
EP1719900B1 EP1719900B1 (fr) 2007-06-20

Family

ID=35094273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425291A Revoked EP1719900B1 (fr) 2005-05-04 2005-05-04 Piston à haute densité d'alliage en métal pour le moteur à combustion interne et le procédé pour fabriquer un tel piston

Country Status (4)

Country Link
EP (1) EP1719900B1 (fr)
AT (1) ATE365272T1 (fr)
DE (1) DE602005001446T2 (fr)
ES (1) ES2288735T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008035696A1 (de) * 2008-07-30 2010-02-18 Mahle International Gmbh Kolben oder Kolbenoberteil für einen Verbrennungsmotor sowie Herstellungsverfahren hierfür

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032671A1 (de) * 1980-08-29 1982-03-18 Alcan Aluminiumwerk Nürnberg GmbH, 6000 Frankfurt Kolben fuer brennkraftmaschinen
US20040177503A1 (en) * 2003-03-14 2004-09-16 Mahle Gmbh Method for the production of a forged piston for an internal combustion engine
US20050034598A1 (en) * 2000-10-18 2005-02-17 Carmo Ribeiro Multi-axially forged piston
WO2005024216A1 (fr) * 2003-09-02 2005-03-17 Mahle Gmbh Piston pour un moteur a combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032671A1 (de) * 1980-08-29 1982-03-18 Alcan Aluminiumwerk Nürnberg GmbH, 6000 Frankfurt Kolben fuer brennkraftmaschinen
US20050034598A1 (en) * 2000-10-18 2005-02-17 Carmo Ribeiro Multi-axially forged piston
US20040177503A1 (en) * 2003-03-14 2004-09-16 Mahle Gmbh Method for the production of a forged piston for an internal combustion engine
WO2005024216A1 (fr) * 2003-09-02 2005-03-17 Mahle Gmbh Piston pour un moteur a combustion interne

Also Published As

Publication number Publication date
ATE365272T1 (de) 2007-07-15
DE602005001446D1 (de) 2007-08-02
DE602005001446T2 (de) 2008-03-13
EP1719900B1 (fr) 2007-06-20
ES2288735T3 (es) 2008-01-16

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