EP0332586A1 - Culasse à matériel léger pour un moteur à combustion interne avec pièce intercalée en acier fritté et méthode de fabrication - Google Patents

Culasse à matériel léger pour un moteur à combustion interne avec pièce intercalée en acier fritté et méthode de fabrication Download PDF

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Publication number
EP0332586A1
EP0332586A1 EP89830081A EP89830081A EP0332586A1 EP 0332586 A1 EP0332586 A1 EP 0332586A1 EP 89830081 A EP89830081 A EP 89830081A EP 89830081 A EP89830081 A EP 89830081A EP 0332586 A1 EP0332586 A1 EP 0332586A1
Authority
EP
European Patent Office
Prior art keywords
valve
chamber
seat
aperture
piston
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
EP89830081A
Other languages
German (de)
English (en)
Other versions
EP0332586B1 (fr
Inventor
Stefano Taricco
Paolo Luca Antona
Antonio Burgio Di Aragona
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0332586A1 publication Critical patent/EP0332586A1/fr
Application granted granted Critical
Publication of EP0332586B1 publication Critical patent/EP0332586B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
    • 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
    • F02F1/26—Cylinder heads having cooling means
    • F02F1/36—Cylinder heads having cooling means for liquid cooling
    • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
    • 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
    • F02B2275/16—Indirect injection
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the present invention relates to a vacuum limiting device.
  • Limiting devices which operate automatically, when the vacuum in a particular environment exceeds a predetermined threshold, to put the environment into communication with the atmosphere. An air flow thus enters the environment, reducing the vacuum therein to a value below the threshold.
  • the object of the present invention is to produce a device which enables the vacuum in a particular environ­ment to be limited without the need to put the environ­ment into communication with the atmosphere for this purpose.
  • a vacuum limiting device characterised in that it includes a body with first and second apertures which can communicate with each other through a chamber defined in the body and are intended to be connected to a vacuum source and to an accumulator or vacuum user respectively, and with a third aperture through which the chamber communicates with the atmosphere; an on-off valve being provided in the chamber for interrupting the communica­tion between the first and second apertures, the valve comprising a seat and a movable obturator controlled by an operating piston which is slidable in the chamber and sealingly separates the first and second apertures from the third aperture of the body, the piston being adapted to close the valve against the action of resilient biassing means which tend to open the valve, when the vacuum applied to the second aperture exceeds a predeter­mined value.
  • the vacuum limiting device according to the invention can conveniently be used, for example, in vacuum servobraking systems, in pneumo-hydraulic anti-skid braking systems, etc.
  • a vacuum limiting device includes a body which, in the embodiment illustrated in Figures 1 and 2, is constituted by an element 1 in which a cavity closed by an element, indicated 2, is formed.
  • First and second inlet apertures 3 and 4 are formed in the element 1 and respective connectors 5 and 6 are fixed therein.
  • the connector 5 is intended for connection to a vacuum source, for example, a vacuum pump, whilst the connector 6 is intended for connection to the environment in which the vacuum is to be limited, for example, a reservoir or other user device.
  • the aperture 3 communicates with the chamber defined between the elements 1 and 2 of the body through an elbow duct 7.
  • the chamber is divided into two regions 8 and 9 by a piston 10 which is sealingly slidable therein.
  • the regions 8 and 9 are sealed from each other.
  • An annular valve seat 11 is formed in the region 8 around the mouth of the duct 7. Moreover, a duct 12 communicat­ing with the aperture 4 opens into the side of the region 8.
  • An annular obturator 13 carried by the piston 10 is associated with the valve seat 11. At its end opposite the seat 11, the piston 10 has a longitudinal cylindrical appendage 15 which is sealingly slidable in a cylindrical recess 16 defined in the element 2. This recess and the appendage 15 of the piston have diameters smaller than those of the regions 8 and 9.
  • An axial passage 17 is formed in the piston 12 and extends within the end of the piston facing the seat 11 as far as the appendage 15, and opens into the recess 16.
  • the obturator 13 is carried externally of this passage.
  • the inside diameter of the valve seat 11 (indicated D1 in the drawings) is conveniently equal to or even a little greater than the diameter of the recess 16 and of the appendage 15 of the piston 10.
  • a helical spring, indicated 18, is arranged in the manner shown in the drawings and biasses the piston 10 away from the valve seat 11.
  • the region 9 communicates permanently with the atmosphere through a passage 19 formed in the element 2.
  • the device described above operates in the following manner.
  • the spring 18 moves the piston 10 down again and removes the obturator 13 from the valve seat 11.
  • the device according to the invention enables the vacuum in an environment to be limited without the need to put the environment into communica­tions with atmosphere for that purpose.
  • valve seat 11 in the portion of the duct upstreams of the valve seat 11 there is defined another valve seat indicated 20.
  • An obturator element 21 cooper­ates with the latter seat, under the action of a helicoidal spring 22 which urges it against said seat.
  • the spring 22 has an end which reacts against an abutment predisposed in the input connector 5.
  • the seat 20, the obturator 21 and the spring 22 define, as a whole, a check valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Valves (AREA)
  • Powder Metallurgy (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP89830081A 1988-03-11 1989-02-28 Culasse à matériel léger pour un moteur à combustion interne avec pièce intercalée en acier fritté et méthode de fabrication Expired - Lifetime EP0332586B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67205/88A IT1219101B (it) 1988-03-11 1988-03-11 Testata di materiale leggero per motori a combustione interna con inserti di acciaio sinterizzato e relativo procedimento di fabbricazione
IT6720588 1988-03-11

Publications (2)

Publication Number Publication Date
EP0332586A1 true EP0332586A1 (fr) 1989-09-13
EP0332586B1 EP0332586B1 (fr) 1992-01-02

Family

ID=11300481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830081A Expired - Lifetime EP0332586B1 (fr) 1988-03-11 1989-02-28 Culasse à matériel léger pour un moteur à combustion interne avec pièce intercalée en acier fritté et méthode de fabrication

Country Status (5)

Country Link
EP (1) EP0332586B1 (fr)
BR (1) BR8901044A (fr)
DE (1) DE68900621D1 (fr)
ES (1) ES2027831T3 (fr)
IT (1) IT1219101B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2666847A1 (fr) * 1990-09-13 1992-03-20 Peugeot Moteur a allumage par compression a soupape d'admission perfectionnee.
WO2003006811A1 (fr) * 2001-07-11 2003-01-23 Mahle Ventiltrieb Gmbh Piece rapportee servant de zone de base d'une culasse

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176666A (en) * 1964-02-03 1965-04-06 Herbert A Whitehead Internal combustion engine cylinder heads
EP0167034A1 (fr) * 1984-06-12 1986-01-08 Sumitomo Electric Industries Limited Siège de soupape pour moteur à combustion interne et méthode pour sa production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB711739A (en) * 1951-07-25 1954-07-07 Lanova Ag Improvements in or relating to cylinder heads for fuel-injection internal-combustionengines
US3081754A (en) * 1961-02-14 1963-03-19 Georges Raymond Internal combustion engines, in particular of the constant pressure cycle type

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176666A (en) * 1964-02-03 1965-04-06 Herbert A Whitehead Internal combustion engine cylinder heads
EP0167034A1 (fr) * 1984-06-12 1986-01-08 Sumitomo Electric Industries Limited Siège de soupape pour moteur à combustion interne et méthode pour sa production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 16 (M-270)[1453], 24th January 1984, page 94 M 270; & JP-A-58 177 402 (MITSUBISHI JUKOGYO K.K.) 18-10-1983 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2666847A1 (fr) * 1990-09-13 1992-03-20 Peugeot Moteur a allumage par compression a soupape d'admission perfectionnee.
WO2003006811A1 (fr) * 2001-07-11 2003-01-23 Mahle Ventiltrieb Gmbh Piece rapportee servant de zone de base d'une culasse

Also Published As

Publication number Publication date
IT1219101B (it) 1990-05-03
EP0332586B1 (fr) 1992-01-02
ES2027831T3 (es) 1992-06-16
DE68900621D1 (de) 1992-02-13
BR8901044A (pt) 1989-10-24
IT8867205A0 (it) 1988-03-11

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