EP0070212B1 - Dispositif de fixation d'un écran thermique - Google Patents

Dispositif de fixation d'un écran thermique Download PDF

Info

Publication number
EP0070212B1
EP0070212B1 EP82401140A EP82401140A EP0070212B1 EP 0070212 B1 EP0070212 B1 EP 0070212B1 EP 82401140 A EP82401140 A EP 82401140A EP 82401140 A EP82401140 A EP 82401140A EP 0070212 B1 EP0070212 B1 EP 0070212B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
cylinder
seat
barrier
screen
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.)
Expired
Application number
EP82401140A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0070212A1 (fr
Inventor
Jean-Paul Reynaud
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 Trucks SAS
Original Assignee
Renault Vehicules Industriels SA
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 Vehicules Industriels SA filed Critical Renault Vehicules Industriels SA
Priority to AT82401140T priority Critical patent/ATE12972T1/de
Publication of EP0070212A1 publication Critical patent/EP0070212A1/fr
Application granted granted Critical
Publication of EP0070212B1 publication Critical patent/EP0070212B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • 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 
    • F02F1/24—Cylinder heads
    • F02F2001/249—Cylinder heads with flame plate, e.g. insert in the cylinder head used as a thermal insulation between cylinder head and combustion chamber

Definitions

  • the present invention relates to means for simultaneously fixing and centering a heat shield usable in particular for the cylinder heads of an internal combustion engine fitted with a valve for controlling the transfer of gases in the combustion chamber of the engine.
  • the combustion chambers are generally delimited by the internal walls of a cylinder, by the face of a piston which moves in the cylinder under the combined effect of the pressure of the gases of the combustion chamber and the inertia of the mechanical drive means of the piston, and, respectively, by the internal walls of a cylinder closing cylinder head often constituting the hottest part of the envelope of the combustion chamber.
  • the materials most frequently used for these heat shields are ceramics consisting for example of zirconium oxides, nitrides or silicon carbides and produced by sintering after cold or hot pressing.
  • Other materials used for these heat shields are refractories and / or alloys which are weakly conductive and which have good resistance to thermal shock to withstand significant surface overheating and renewed at each combustion cycle.
  • Document US-A-4,046,114 describes a device for fixing a heat shield intended in particular to protect the face of the cylinder head constituting one of the walls of the combustion chamber of the cylinder of an internal combustion engine, the Gas transfer is controlled by seat valves fitted in the cylinder head.
  • the device consists of an injector pipe, the end of which is flared by pushing back, thereby fixing the pinched heat shield between the cylinder head and the cylinder liner.
  • Document DE-A-2,844,923 relates to the fixing of a thermal protection ring on the wall of a cylinder head by means of an annular peripheral rim with which the valve seats are provided.
  • One of the aims of the present invention is precisely to overcome the defects and requirements of the heat shields mentioned above for the combustion chambers.
  • the invention provides a device for simultaneously fixing and centering a heat shield, in which at least one of the attached valve seats is provided with an annular peripheral rim which, when the seat is fitted in its cylinder head bore, presses against the wall of the cylinder head, the heat shield which is also pinched between the cylinder head and the cylinder liner via the cylinder head gasket interposed between the cylinders and the cylinder head.
  • the contact between the annular rim of the valve seat and the screen is effected by means of at least a couple of two conjugate conical surfaces, formed respectively on the rim of the seat and on the screen so as to center the screen on the seat and make up for the play existing between the seat and the screen.
  • the screen made up of a thin flexible plate is clamped in relatively close areas of the intake and exhaust valves, which makes it possible to suppress or reduce the vibrations which could arise. at certain engine rotation speeds exciting the natural frequencies of vibration of the flexible plate.
  • the precision of fixing of the plate and its centering remain relatively favorable taking into account the precision of fixing of the valve seats in the cylinder head.
  • the plate constituting the screen can perfectly match the shape of the walls of the combustion chamber while retaining the possibility of expanding relative to the valve seats and to the edge of the cylinder liner.
  • Modern combustion engines have tooth at least one intake valve and one exhaust valve which, in diesel engines in particular, are often aligned in the center of the cylinder and along the general axis of the engine, the two attached valve seats fix the screen along a fixing line leaving on both sides possibilities of expansion on the screen.
  • the heat shield is held in position by the valve seats and is applied to the cylinder head gasket.
  • a separate heat shield is provided for each cylinder of the engine and is applied between the cylinder head and the jacket of each cylinder.
  • the combustion chamber shown in the figure and corresponding to the cylinder of an internal combustion engine is delimited by the jacket 1 of the cylinder, by the movable piston inside this cylinder and not shown, and respectively by the cylinder head 2 of the engine in bores 3 and 4 of which are fitted by hard fitting of the seats of intake and exhaust valves 6.
  • a heat shield 7 consisting of a thin plate made of a suitable material such as refractory ceramic and / or relatively heat insulating is fixed according to the invention by pressing an annular peripheral rim 8 of the valve seats 5 and 6 which presses the screen 7 on the relatively flat wall of the part of the combustion chamber defined by the cylinder head 2.
  • the cylinder head gasket 9 interposed between the cylinder head 2 and the upper face 10 of the liner 1 elastically pinches the thermal screen on its periphery.
  • the connection between the body of the valve seat 5 and 6 and the flange 8 has a conical surface 11 which cooperates with a conjugate conical surface 12 formed on the bore of the screen 7 traversed by the valve seat to properly center the screen 7 on the corresponding seat 5 or 6 and make up for the inevitable clearances existing between the bore of the screen 7 and the external surface of the valve seat which passes through this bore.
  • the screen 7 has a countersink 13 in which the flange 8 is housed and whose annular bottom wall 14 serves as a stop for the corresponding valve seat 5 or 6.
  • the intake and exhaust valves are aligned transversely along an axis line passing through the longitudinal axis 15 of the cylinder and through the general axis of the line of the engine cylinders.
  • the screen covers a reduced surface of the cylinder head wall in the central axial part thereof which is in fact covered by the cylinder valves.
  • larger surfaces of the cylinder head are covered by the screen 7 beyond this axial part of the cylinder head appearing in the section plane of the figure.
  • the mounting of the heat shield 7 is carried out as follows: the shield 7 is placed in position in the cylinder head before the fitting of the valve seats 5 and 6 in their corresponding bores 3 and 4. The valve seats 5 and 6 are then force fitted into their bore to tighten the screen 7 by their flange 8 and center it by their conical surface 11. The screen and the valve seats being mounted, it is then possible to fully equip the cylinder head 2 in particular by installing the valves and their return springs there. The fixing of the screens 7 is then completed when the cylinder head 2 is tightened on the engine block surrounding the liners 1 because the edges of the screen 7 come to bear on the cylinder head gasket 9 which is relatively elastic and which allows these edges to move. of the screen under the effect of the temperature variations of the screen 7 and the differential expansions between the jacket 1, the cylinder head gasket 9 and the heat screen 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Building Environments (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Radiation Pyrometers (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
EP82401140A 1981-07-10 1982-06-22 Dispositif de fixation d'un écran thermique Expired EP0070212B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401140T ATE12972T1 (de) 1981-07-10 1982-06-22 Anordnung zur befestigung eines waermeschutzes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113612 1981-07-10
FR8113612A FR2509372A1 (fr) 1981-07-10 1981-07-10 Dispositif de fixation d'un ecran thermique

Publications (2)

Publication Number Publication Date
EP0070212A1 EP0070212A1 (fr) 1983-01-19
EP0070212B1 true EP0070212B1 (fr) 1985-04-24

Family

ID=9260430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401140A Expired EP0070212B1 (fr) 1981-07-10 1982-06-22 Dispositif de fixation d'un écran thermique

Country Status (6)

Country Link
US (1) US4449492A (enrdf_load_stackoverflow)
EP (1) EP0070212B1 (enrdf_load_stackoverflow)
AT (1) ATE12972T1 (enrdf_load_stackoverflow)
DE (1) DE3263248D1 (enrdf_load_stackoverflow)
FR (1) FR2509372A1 (enrdf_load_stackoverflow)
PL (1) PL237362A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331145C2 (de) * 1983-08-30 1986-08-28 Audi AG, 8070 Ingolstadt Leichtmetall-Zylinderkopf für Hubkolben-Brennkraftmaschinen
FR2603341B1 (fr) * 1986-08-29 1990-09-14 Europ Propulsion Culasse de moteur thermique ceramisee
RU2256809C2 (ru) * 2001-04-25 2005-07-20 Казанцев Виктор Андреевич Адиабатный двигатель казанцева
WO2021242565A1 (en) 2020-05-27 2021-12-02 Cummins Inc. Anti-polish ring for an engine cylinder

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125082A (en) * 1964-03-17 Internal combustion engine cylinder heads
GB968342A (en) * 1961-03-01 1964-09-02 Ruston & Hornsby Ltd Improvements in internal combustion engine cylinder heads
US3115127A (en) * 1961-10-02 1963-12-24 Charles O Spencer Removable insert for internal combustion chambers
US3436085A (en) * 1966-01-19 1969-04-01 Cleveland Technical Center Inc Sealing structure embodying deformable ring
US4046114A (en) * 1975-10-06 1977-09-06 General Motors Corporation Insulated, high efficiency, low heat rejection, engine cylinder head
DE2816923C2 (de) * 1978-04-19 1983-01-27 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Zylinderkopf für Brennkraftmaschinen
DE2844923A1 (de) * 1978-10-14 1980-05-29 Maschf Augsburg Nuernberg Ag Zylinderkopf fuer brennkraftmaschinen mit waermeschutz fuer ventilsteg
DE2911683A1 (de) * 1979-03-24 1980-10-02 Daimler Benz Ag Abdichtung eines zylinderkopfes einer brennkraftmaschine

Also Published As

Publication number Publication date
ATE12972T1 (de) 1985-05-15
PL237362A1 (en) 1983-03-14
EP0070212A1 (fr) 1983-01-19
FR2509372B1 (enrdf_load_stackoverflow) 1983-12-02
DE3263248D1 (en) 1985-05-30
US4449492A (en) 1984-05-22
FR2509372A1 (fr) 1983-01-14

Similar Documents

Publication Publication Date Title
US4774926A (en) Shielded insulation for combustion chamber
CA1056246A (en) Exhaust port liner system in engines
EP0210098A1 (fr) Culasse de moteur à combustion interne alimenté par injection
JP2005513335A (ja) 燃料噴射弁と点火プラグとの組み合わせ
EP0049396A1 (en) Poppet valve shield
FR2507682A1 (fr) Chambre de precombustion dans une tete de cylindre d'un moteur diesel
EP0070212B1 (fr) Dispositif de fixation d'un écran thermique
US4346870A (en) Thermal barrier for poppet valve
JPH0223788Y2 (enrdf_load_stackoverflow)
US4514656A (en) Combination sparkplug and combustion process sensor
JPS59200012A (ja) 内燃機関の副燃焼室
FR2621076A1 (fr) Structure de chambre de precombustion pour moteur a combustion interne
US4508066A (en) Ceramic head for internal combustion engine
FR2643417A1 (fr) Ensemble de soupape pour moteurs a explosion
EP0229568B1 (fr) Préchambre de combustion à isolation thermique variable
JPH0357298B2 (enrdf_load_stackoverflow)
JPH0144901B2 (enrdf_load_stackoverflow)
JPS6117235Y2 (enrdf_load_stackoverflow)
JPS59188025A (ja) デイ−ゼルエンジンの副燃焼室組立方法
EP0120792A1 (fr) Culasse pour moteurs à combustion interne à allumage par compression
JPH0121160Y2 (enrdf_load_stackoverflow)
JPS6313384Y2 (enrdf_load_stackoverflow)
BE384932A (fr) Procédé et dispositifs perfectionnés pour effectuer la combustion dans les moteurs à combustion interne du type à injection de combustible liquide et à allumage par compression
JPH0218299Y2 (enrdf_load_stackoverflow)
JPH0118821Y2 (enrdf_load_stackoverflow)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19820625

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 12972

Country of ref document: AT

Date of ref document: 19850515

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3263248

Country of ref document: DE

Date of ref document: 19850530

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860521

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19860630

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19870622

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19870623

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19870630

Ref country code: CH

Effective date: 19870630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19880101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880226

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19880301

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881121

EUG Se: european patent has lapsed

Ref document number: 82401140.7

Effective date: 19880713