WO2006058596A1 - Piston pour moteurs thermiques - Google Patents

Piston pour moteurs thermiques Download PDF

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Publication number
WO2006058596A1
WO2006058596A1 PCT/EP2005/011872 EP2005011872W WO2006058596A1 WO 2006058596 A1 WO2006058596 A1 WO 2006058596A1 EP 2005011872 W EP2005011872 W EP 2005011872W WO 2006058596 A1 WO2006058596 A1 WO 2006058596A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
convexity
combustion chamber
head
internal combustion
Prior art date
Application number
PCT/EP2005/011872
Other languages
English (en)
Inventor
Giuseppe Bocchi
Original Assignee
B.R.D. Di Bocchi Ing. Giuseppe & C. S.R.L.
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 B.R.D. Di Bocchi Ing. Giuseppe & C. S.R.L. filed Critical B.R.D. Di Bocchi Ing. Giuseppe & C. S.R.L.
Priority to JP2007543718A priority Critical patent/JP2008522091A/ja
Publication of WO2006058596A1 publication Critical patent/WO2006058596A1/fr

Links

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 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
    • F02B23/0681—Square, rectangular or the like profiles
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention deals with a piston for internal combustion engines.
  • internal combustion engines are thermal motive machines which transform into mechanical work part of the thermal energy freed by burning fuels inside the machine itself; said transforming occurs by means of a working fluid (mixture of fuel air) which, by being expanded and compressed, exchanges energy with moving machine members.
  • the classification criteria of internal combustion engines are several and can be based, for example, on the following parameters:
  • Air supply aspirated engine, supercharged engine, turbo- supercharged engine; '
  • Fuel supply carburetion, cylinder (direct) injection, suction manifold (in direct) injection;
  • the most used type of internal combustion engines is the one providing for the burning of a suitable mixture inside a combustion chamber composed of a cylinder closet on its lower part by a un piston and on its upper part by an head; said head has fluid inlet valves, discharge gas exhaust valves and possibly an injector and/or a spark plug to generate a spark.
  • a connecting rod is hinged, through a connection piston pin, to the piston in order to transform the alternate straight motion into a rotary motion.
  • a correct combustion is essential; this occurs by suitably designing the combustion chamber in order to allow the fluid to obtain a quick advancement of the combustion phase; consequently, there will be a higher specific power, a lower cyclic dispersion, an efficiency gain and a better emission control.
  • combustion chamber design affects its filling placing limitations to maximum valve diameter and shape of suction and discharge duct outlets.
  • a good combustion chamber prevents anomalous combustion phenomena, spark advancing or delaying in time the compressed mixture ignition.
  • Object of the present invention is making available a piston for internal combustion engines which allows placing the connecting rod small end as near as possible to the piston top, namely in the recess tunnel obtained under the piston crown. Another object is providing a convexity obtained in the head which is able to induce better turbulences of the fresh charter inside the piston cup.
  • valves can be advantageously placed in a vertical position with respect to the piston head
  • - figure 1 shows a piston for internal combustion engine, subject of the present invention, in a perspective view
  • - figure 2 shows, from a different angle, the piston of figure 1 ;
  • figure 3 shows the top plane view of the piston of figure 1 ;
  • FIG. 5 shows section A-A of the piston of figure 3.
  • a piston 1 is shown in whose head 2 a cup-type combustion chamber is obtained, designated with 4.
  • the relative maximum point of the convexity 3 is placed next to the centre distance of the head 2 and projects from the combustion chamber 4 bottom.
  • the convexity 3 is preferably arranged according to the direction of axis 5 of the connection piston pin of the connecting rod with piston 1 and extends for the whole combustion chamber 4 diameter.
  • the convexity 3 is substantially symmetrical with respect to the centre distance of the head 2, according to a sectional median plane transverse to the piston pin axis.
  • the recess 3b is substantially symmetrical with respect to the centre distance of the head 2, according to a sectional transverse plane to the piston pin axis.
  • the configuration shown in the example allows taking the axis 5 of the connection piston pin of the connecting rod with piston 1 as near as possible to the piston 1 barycentre, with the connecting rod eye contained in the recess 3b.
  • piston 1 is subjected to numerous variations as regards the shape of the combustion chamber 4, the possible placement of valve prints on the head, the number of rings or scraper rings being present and so on.
  • convexity 3 and concavity 3b can be placed in an asymmetrical position with respect to a sectional median plane transverse to the piston pin axis 5.
  • the convexity 3 extends for a shorter length than the cup diameter of the combustion chamber 4.

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)

Abstract

L'invention concerne le domaine des moteurs thermiques et notamment un piston pour moteurs thermiques du type qui comprend une chambre de combustion (4) obtenue dans la tête de piston (2). Une convexité (3), qui est projetée du fond de la chambre de combustion (4), est disposée selon l'axe (5) du piston de connexion de la bielle avec le piston (1). Un évidement similaire (3b), formé dans la partie sous-jacente (2a) de la tête (2), permet d'arranger la petite extrémité de la bielle à l'intérieur de l'évidement ci-dessus (3b).
PCT/EP2005/011872 2004-12-03 2005-11-07 Piston pour moteurs thermiques WO2006058596A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007543718A JP2008522091A (ja) 2004-12-03 2005-11-07 内燃機関用のピストン

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR2004A000084 2004-12-03
IT000084A ITPR20040084A1 (it) 2004-12-03 2004-12-03 Pistone per motori a combustione interna.

Publications (1)

Publication Number Publication Date
WO2006058596A1 true WO2006058596A1 (fr) 2006-06-08

Family

ID=35768802

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/011872 WO2006058596A1 (fr) 2004-12-03 2005-11-07 Piston pour moteurs thermiques

Country Status (4)

Country Link
JP (1) JP2008522091A (fr)
CN (1) CN101069009A (fr)
IT (1) ITPR20040084A1 (fr)
WO (1) WO2006058596A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8286606B2 (en) 2005-09-14 2012-10-16 GM Global Technology Operations LLC Piston for an internal combustion engine
DE102015005469A1 (de) * 2015-04-29 2016-11-03 Caterpillar Motoren Gmbh & Co. Kg Kolbenkrone mit kolbenbodenmulde
WO2023110130A1 (fr) * 2021-12-17 2023-06-22 Volvo Truck Corporation Piston et système de moteur à combustion interne

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1803250A (en) * 1927-05-12 1931-04-28 Hemmingsen Torkild Valdemar Internal-combustion engine
US4694735A (en) * 1984-10-22 1987-09-22 Toyota Jidosha Kabushiki Kaisha Piston for internal combustion engine
US5065706A (en) * 1987-09-30 1991-11-19 Mahle Gmbh Cooled plunger piston for internal combustion engines
US5762038A (en) * 1995-06-02 1998-06-09 Kolbenschmidt Ag Arrangement of piston and connecting rod for internal combustion engines
US6026777A (en) * 1998-10-07 2000-02-22 Mahle Gmbh Piston having a barrel of forged steel and a cooling channel
EP0997611A2 (fr) * 1998-10-28 2000-05-03 Nissan Motor Company Limited Moteur à combustion interne avec injection directe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1803250A (en) * 1927-05-12 1931-04-28 Hemmingsen Torkild Valdemar Internal-combustion engine
US4694735A (en) * 1984-10-22 1987-09-22 Toyota Jidosha Kabushiki Kaisha Piston for internal combustion engine
US5065706A (en) * 1987-09-30 1991-11-19 Mahle Gmbh Cooled plunger piston for internal combustion engines
US5762038A (en) * 1995-06-02 1998-06-09 Kolbenschmidt Ag Arrangement of piston and connecting rod for internal combustion engines
US6026777A (en) * 1998-10-07 2000-02-22 Mahle Gmbh Piston having a barrel of forged steel and a cooling channel
EP0997611A2 (fr) * 1998-10-28 2000-05-03 Nissan Motor Company Limited Moteur à combustion interne avec injection directe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8286606B2 (en) 2005-09-14 2012-10-16 GM Global Technology Operations LLC Piston for an internal combustion engine
DE102015005469A1 (de) * 2015-04-29 2016-11-03 Caterpillar Motoren Gmbh & Co. Kg Kolbenkrone mit kolbenbodenmulde
WO2023110130A1 (fr) * 2021-12-17 2023-06-22 Volvo Truck Corporation Piston et système de moteur à combustion interne

Also Published As

Publication number Publication date
JP2008522091A (ja) 2008-06-26
CN101069009A (zh) 2007-11-07
ITPR20040084A1 (it) 2005-03-03

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