EP3092394A1 - Brennkraftmaschine mit fixem kopf und verbesserter gasdichtigkeit - Google Patents

Brennkraftmaschine mit fixem kopf und verbesserter gasdichtigkeit

Info

Publication number
EP3092394A1
EP3092394A1 EP15701564.5A EP15701564A EP3092394A1 EP 3092394 A1 EP3092394 A1 EP 3092394A1 EP 15701564 A EP15701564 A EP 15701564A EP 3092394 A1 EP3092394 A1 EP 3092394A1
Authority
EP
European Patent Office
Prior art keywords
motor according
liner
housing
internal combustion
fixed
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
EP15701564.5A
Other languages
English (en)
French (fr)
Other versions
EP3092394B1 (de
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
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 Renault SAS filed Critical Renault SAS
Publication of EP3092394A1 publication Critical patent/EP3092394A1/de
Application granted granted Critical
Publication of EP3092394B1 publication Critical patent/EP3092394B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 a blind internal combustion engine for a motor vehicle comprising an improved gas seal device.
  • a blind motor 1 to internal combustion 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 cylinder block portion 7 comprises at least one vertical cylindrical chamber 8 opening at a high end in the cavity of the chamber roof 26 in the cylinder head portion 2 and opening in its lower end in a connecting rod chamber 9.
  • the cylindrical chamber 8 is shaped to accommodate a cylindrical jacket 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 at the top and a circular air chamber 22 of the intake circuit of air, disjoined from the water chamber 21 by a prominent edge and located in the lower part.
  • On an inner wall of the air chamber 22 has at least one hole 35, preferably drilled in an upper region of the chamber 22 d x air and opening into a bore of the liner 3, orifice 35 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 accommodate an O-ring made of elastomeric material, sealing the water chamber 21 and air 22, with the exception of the orifice 35. [005] On assembly, the jacket 3, equipped with seals
  • 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 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 gas tightness 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 means forming a spring make it possible to absorb the thermal expansions of the elements in contact, source expansions of the variations between the cold contact pressures and the hot contact pressures, thus reducing the risks of failure of the bearing. crankshaft, on the one hand, and, on the other hand, plasticizing the bearing zone of the upper face of the jacket.
  • the blind internal combustion engine according to the invention comprises at least one of the following additional technical characteristics:
  • the resilient spring means are attached to the crankshaft bearing
  • the elastic spring means have a low stiffness
  • the resilient spring means comprise a leaf spring
  • the resilient spring means comprise soft pads
  • the soft pads are made of polyether ether ketone or polyamide-imide;
  • the resilient spring means comprise a "Belleville” type washer.
  • FIG. 1 is a sectional view of a blind engine internal combustion according to the state of the art
  • FIG. 2 is a three-dimensional view of a sleeve / bearing assembly embodying a first embodiment of the elastic spring means of a blind motor according to the invention
  • Figure 3 is a three-dimensional view of the first embodiment of spring elastic means
  • FIG. 4 is a three-dimensional view of a second embodiment of spring elastic means mounted on a bearing of a blind motor according to the invention.
  • Figure 5 is a three-dimensional view of a sleeve / bearing assembly implementing the second embodiment of the elastic spring means of a blind motor according to the invention.
  • spring elastic means are here in the form of a leaf spring 6. This leaf spring 6 is elongated parallelepiped here with a small thickness compared to the other two dimensions.
  • the leaf spring 6 has, over a length, a shape of hump 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 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. a 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. crankshaft bearing 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 has at its lower end 31 a lug 33 extending radially projecting from an outer side wall of the liner 3.
  • the lug 33 bears on a top of the bump 61 of the spring blade 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 spring-forming elastic means are 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 bearing of crankshaft 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 perpendicular crankshaft bearing 400 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 liner 3 has at its lower face 31 end of an ear 33 extending protruding centrifugally from a radially outer side wall of the liner 3.
  • the lug 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.
  • invention thus equipped with the pad 420, the latter 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 pads 420 are here cylindrical in shape of revolution. However, they may have other forms of polygonal section or not. On the other hand, the pads 420 are made of a thermoplastic material such as polyether-ether-ketone (PEEK) or polyamide-imide (PAI).
  • PEEK polyether-ether-ketone
  • PAI polyamide-imide
  • the elastic 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 while hot limiting the increase of the forces in the assembly of the various elements in the blind engine to 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.
  • the resilient spring means are supported on a bearing element which may be a plate, fixed to the housing, in the connecting rod chamber, near the outlet of the cylindrical chamber .
  • a bearing element which may be a plate, fixed to the housing, in the connecting rod chamber, near the outlet of the cylindrical chamber .

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 Brennkraftmaschine mit fixem kopf und verbesserter gasdichtigkeit Active EP3092394B1 (de)

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 true EP3092394A1 (de) 2016-11-16
EP3092394B1 EP3092394B1 (de) 2017-11-15

Family

ID=50290127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15701564.5A Active EP3092394B1 (de) 2014-01-10 2015-01-12 Brennkraftmaschine mit fixem kopf und verbesserter gasdichtigkeit

Country Status (4)

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

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
See references of WO2015104515A1 *

Also Published As

Publication number Publication date
WO2015104515A1 (fr) 2015-07-16
FR3016404A1 (fr) 2015-07-17
FR3016404B1 (fr) 2018-08-10
BR112016015775B1 (pt) 2023-01-10
BR112016015775A2 (de) 2017-08-08
EP3092394B1 (de) 2017-11-15

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