EP3092394B1 - Moteur borgne à combustion interne avec une etancheite aux gaz améliorée - Google Patents

Moteur borgne à combustion interne avec une etancheite aux gaz améliorée Download PDF

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Publication number
EP3092394B1
EP3092394B1 EP15701564.5A EP15701564A EP3092394B1 EP 3092394 B1 EP3092394 B1 EP 3092394B1 EP 15701564 A EP15701564 A EP 15701564A EP 3092394 B1 EP3092394 B1 EP 3092394B1
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EP
European Patent Office
Prior art keywords
spring
engine
fixed
elastic means
engine according
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.)
Active
Application number
EP15701564.5A
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German (de)
English (en)
French (fr)
Other versions
EP3092394A1 (fr
Inventor
Marek ABRAMCZUK
Frédéric JUSTET
Pascal Tribotte
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.)
Renault SAS
Original Assignee
Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP3092394A1 publication Critical patent/EP3092394A1/fr
Application granted granted Critical
Publication of EP3092394B1 publication Critical patent/EP3092394B1/fr
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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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/002—Integrally formed cylinders and cylinder heads
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0053—Crankshaft bearings fitted in the crankcase
    • 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
    • F02B75/00—Other engines
    • F02B75/40—Other reciprocating-piston engines

Definitions

  • the invention relates to an internal combustion blind engine for a motor vehicle comprising an improved gas sealing device.
  • an internal combustion blind motor 1 is the assembly consisting of a cylinder head portion 2 and a cylinder block portion 7 in one piece obtained by molding.
  • the yoke portion 2 comprises at least one exhaust duct, said duct opening into a combustion chamber roof 26 which forms a substantially conical cavity and whose object is to improve combustion.
  • the breech part 2 comprises at least one valve which closes the access to said exhaust duct.
  • the cylinder head 2 also supports injection and ignition devices.
  • the document FR 1,420,479 A also discloses a blind engine with internal combustion.
  • the cylinder block portion 7 comprises at least one vertical cylindrical chamber 8 opening at an upper end in the cavity of the chamber roof 26 in the cylinder head portion 2 and opening in its lower end in a connecting shaft chamber 9.
  • the cylindrical chamber 8 is shaped to accommodate a cylindrical sleeve 3.
  • the crank chamber houses a crankshaft maintained along a horizontal axis by at least one crankshaft bearing 4 disposed transversely to the axis of the crankshaft.
  • the crankshaft bearing 4 is fixed on the cylinder block portion 7 by fixing devices 24 located on either side of the crankshaft bearing 4.
  • the jacket 3 is a cylindrical tube-shaped piece of metal material whose outer diameter is less than or equal to a diameter of the cylindrical chamber 8, and a length is equal to or greater than a length of the cylindrical chamber 8.
  • the jacket 3 and the cylindrical chamber 8 define between them a water chamber 21 preferably circular of the cooling circuit located in the upper part and a circular air chamber 22 of the air intake circuit , disjoined from the water chamber 21 by a prominent edge and located in the lower part.
  • the air chamber 22 comprises at least one orifice 35, pierced preferentially in an upper zone of the air chamber 22 and opening into a bore of the jacket 3, orifice 35 intended for the passage of fresh air inlet to feed the combustion chamber in the bore of said jacket 3.
  • This orifice is substantially halfway up the jacket 3.
  • the jacket 3 also comprises, on each prominent edge of the water chambers 21 and air, a circular groove 25 adapted to receive an O-ring of elastomeric material, sealing the water chambers 21 and air 22, with the exception of the orifice 35.
  • the liner 3, equipped with seals 25, is engaged in the cylindrical chamber 8 by the connecting rod chamber 9 of the engine 1. It is held in place by a pillar 5 arranged for this purpose on the crankshaft bearing 4.
  • the pillar 5 bears on a bottom end face 31 of the liner 3 during the implementation of the fixing devices 24 of the crankshaft bearing 4 on the cylinder block portion 7 of the blind motor 1.
  • one face 32 of the upper end of the jacket 3 is maintained in pressing on an edge of the cavity of the combustion chamber roof 26 in order to achieve a gastightness around the cavity of the combustion chamber roof 26, between this cavity and the water chamber 21.
  • the contact pressures at an interface 27 between the edge of the cavity 26 and the jacket 3 must be greater than a maximum combustion pressure with a certain safety coefficient that can prevail within the combustion chamber.
  • the liner 3, sandwiched between the crankshaft bearing 4 and the edge of the cavity of the combustion chamber roof 26 is compressed to provide a contact pressure necessary for sealing under all operating conditions of the engine. blind motor 1.
  • the engine block is made of aluminum and the casing 3 of cast iron, hot thermal expansion leads to a loss of tension in the assembly.
  • the cold contact pressures increase which may lead to a risk of plasticization in the bearing zone of the face 32 of the liner 3 with the edge of the cavity of the combustion chamber roof 26 and, as the reaction between the face 31 of the liner 3 and the pillar 5 of the crankshaft bearing 4 increases, a risk for the holding of the crankshaft bearing.
  • An object of the invention is to provide an internal combustion blind motor having improved gastightness while avoiding the above disadvantages.
  • a blind engine with internal combustion comprising at least one cylinder comprising a cylindrical chamber, an attached sleeve fitted into the cylindrical chamber and crankshaft bearings on which the liner is supported, the motor further comprising resilient spring means interposed between the liner and the crankshaft bearing so that the liner is supported on the crankshaft bearing via spring elastic means.
  • the resilient spring means are able to absorb the thermal expansion of the elements in contact, the source expansions of the variations between the cold contact pressures and the hot contact pressures, thus reducing the risk of rupture of the crankshaft bearing, on the one hand, and on the other hand, plasticizing the bearing zone of the upper face of the jacket.
  • the resilient spring means are attached to the crankshaft bearing.
  • a motor vehicle having a blind engine with internal combustion having at least one of the above features.
  • the elastic spring means are here in the form of a leaf spring 6.
  • This spring leaf 6 is elongated parallelepiped here with a small thickness in the other two dimensions.
  • the leaf spring 6 has, over a length, a form of humps with a boss 61 and two median ends 63,64 each comprising a substantially oblong receiving opening 62. Said opening may be, as shown in FIG. figure 3 , in the shape of a "U”.
  • the leaf spring 6 is mounted on a crankshaft bearing 40 which comprises for this purpose a pair of pillars 41 located on either side, preferably symmetrically to a vertical axis passing through and perpendicular to an axis of rotation.
  • crankshaft in the crankshaft bearing 40.
  • the pillars 41 project vertically from an upper face of the crankshaft bearing 40 towards the underside 31 of the jacket 3.
  • the pillars 41 are integral with the crankshaft 40.
  • the pillars 41 each comprise a pin 42 which, during assembly, is received in the receiving openings 62 of the leaf spring 6.
  • the liner 3 comprises at its lower end face 31 an ear 33 extending radially projecting from an outer side wall of the liner 3.
  • the lug 33 bears on a vertex of the bump 61 of the spring leaf 6.
  • the leaf spring 6 is found mounted in series between the liner 3 and the crankshaft bearing 40. In operation of the internal combustion engine blind according to the invention and equipped with the leaf spring 6, the latter is deformed elastically when thermal expansion of the jacket 3, the cylinder head part 2 and the crankshaft bearing 4.
  • the elastic spring means are present here in the form of studs 420 reported in orifices arranged for this purpose at a free end 411 of a pillar 410 of a crankshaft bearing 400. Once reported, the pads 420 extend projecting from the free end 411 of the pillar 410.
  • the pillar 410 extends projecting vertically from an upper face of the crankshaft bearing 400 towards the lower face 31 of the liner 3, and to the right of an axis of rotation of a crankshaft in the crankshaft bearing 400.
  • the pillar 410 is integral with the crankshaft bearing 400.
  • the studs 420 are, here, two in number, positioned symmetrically with a mean plane of the crankshaft bearing 400 perpendicular to the axis of rotation of the crankshaft. Such an arrangement makes it possible to interface the crankshaft bearing 400 with two adjacent jackets 3 of the blind internal combustion engine according to the invention, each stud 420 being dedicated to one of the adjacent jackets 3.
  • the jacket 3 has at its lower face 31 end of an ear 33 projecting from centrifugally protruding side wall of the sleeve 3.
  • the ear 33 has a bearing face 330.
  • the ear 33 has its face support 330 which comes into contact with a free end of one of the pads 420.
  • the pad 420 is found connected in series between the liner 3 and the crankshaft bearing 400.
  • the pad 420 is deformed in an elastic manner during the thermal expansions of the jacket 3, the cylinder head part 2 and the crankshaft bearing 4.
  • the studs 420 are here cylindrical in shape of revolution. However, they may have other forms of polygonal section or not.
  • the pads 420 are made of a thermoplastic material such as polyether-ether-ketone (PEEK) or polyamide-imide (PAI).
  • the resilient spring means comprise a "Belleville” type washer.
  • the elastic means forming a spring comprise helical springs.
  • the resilient spring means have a very low stiffness in order to compensate for the thermal expansion at hot while limiting the increase of the forces in the assembly of the various elements in the blind engine with internal combustion according to the invention.
  • the stiffness of said elastic means is preferentially less than 2000N / mm for a unit capacity of less than 500cm3.
  • Such blind internal combustion engine according to the invention is installed in a power unit of a motor vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP15701564.5A 2014-01-10 2015-01-12 Moteur borgne à combustion interne avec une etancheite aux gaz améliorée Active EP3092394B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1450172A FR3016404B1 (fr) 2014-01-10 2014-01-10 Moteur borgne a combustion interne avec une etancheite aux gaz amelioree
PCT/FR2015/050060 WO2015104515A1 (fr) 2014-01-10 2015-01-12 Moteur borgne a combustion interne avec une etancheite aux gaz améliorée

Publications (2)

Publication Number Publication Date
EP3092394A1 EP3092394A1 (fr) 2016-11-16
EP3092394B1 true EP3092394B1 (fr) 2017-11-15

Family

ID=50290127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15701564.5A Active EP3092394B1 (fr) 2014-01-10 2015-01-12 Moteur borgne à combustion interne avec une etancheite aux gaz améliorée

Country Status (4)

Country Link
EP (1) EP3092394B1 (es)
BR (1) BR112016015775B1 (es)
FR (1) FR3016404B1 (es)
WO (1) WO2015104515A1 (es)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203885A (en) * 1938-04-16 1940-06-11 Messerschmitt Boelkow Blohm Liner for internal combustion engines
FR1405930A (fr) * 1964-06-01 1965-07-16 Renault Perfectionnement au montage des chemises de cylindres de moteurs à combustion interne
FR1420479A (fr) * 1964-10-26 1965-12-10 Cefilac Nouveau procédé de fixation des chemises de cylindres d'un moteur et produits industriels nouveaux en résultant
US3882842A (en) * 1974-01-28 1975-05-13 Caterpillar Tractor Co Cylinder liner support
US6848399B2 (en) * 2003-05-30 2005-02-01 Electrolux Home Products, Inc. Scavenging insert for an engine
FR2972381B1 (fr) 2011-03-08 2014-02-21 Renault Sa Moteur borgne a chemise rapportee par le dessous

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2015104515A1 (fr) 2015-07-16
BR112016015775B1 (pt) 2023-01-10
FR3016404B1 (fr) 2018-08-10
BR112016015775A2 (es) 2017-08-08
EP3092394A1 (fr) 2016-11-16
FR3016404A1 (fr) 2015-07-17

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