EP0383695A1 - Ventilanordnung für Brennkraftmaschinen - Google Patents

Ventilanordnung für Brennkraftmaschinen Download PDF

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Publication number
EP0383695A1
EP0383695A1 EP90400437A EP90400437A EP0383695A1 EP 0383695 A1 EP0383695 A1 EP 0383695A1 EP 90400437 A EP90400437 A EP 90400437A EP 90400437 A EP90400437 A EP 90400437A EP 0383695 A1 EP0383695 A1 EP 0383695A1
Authority
EP
European Patent Office
Prior art keywords
valve
seat
valve assembly
combustion chamber
bore
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.)
Withdrawn
Application number
EP90400437A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Fayard
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.)
Elf Antar France
Original Assignee
Elf Antar France
Elf France 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 Elf Antar France, Elf France SA filed Critical Elf Antar France
Publication of EP0383695A1 publication Critical patent/EP0383695A1/de
Withdrawn legal-status Critical Current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
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
    • 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
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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
    • F01L2003/25—Valve configurations in relation to engine
    • F01L2003/258—Valve configurations in relation to engine opening away from cylinder

Definitions

  • the present invention relates to a valve assembly for internal combustion engines and, more particularly to a valve assembly intended to control the passage of gas to or from a combustion chamber of an internal combustion engine.
  • valves fitted to the intake or to the exhaust are arranged so that, when the valve is opened, the valve head enters the combustion chamber of the engine.
  • This arrangement although allowing correct operation of the engine, has the disadvantage that the upper surface of the engine pistons must be provided with a substantially concave zone to avoid any untimely contact between the piston and the valve. The presence of this concave zone can have harmful effects on the combustion of the gasoline / air mixture in the combustion chamber.
  • the object of the present invention is to provide a valve assembly for an internal combustion engine which is reliable, of simple construction and the sealing of which is ensured when the assembly is closed.
  • the invention provides a valve assembly for closing a combustion chamber of an internal combustion engine and comprising a valve and a valve seat, the valve lifting from its seat to open the combustion chamber in s 'away from the latter, characterized in that the valve seat is arranged to move relative to the combustion chamber under the effect of the pressure prevailing in this chamber and thus strengthen the closing of the valve assembly.
  • FIG. 1 shows a part of an internal combustion engine comprising a cylinder 10 in which a piston 12 slides.
  • a combustion chamber 14, of variable volume, is defined between the upper surface 16 of the piston 12 and the cylinder 10 and comprises a spark plug 18.
  • the combustion chamber 14 is connected to a source of a mixture of petrol and air, such as a carburetor (not shown), by a passage 20 formed in the cylinder head 21 of the engine and in which is disposed a valve assembly 22 which will be described in more detail below.
  • the combustion chamber 14 is also connected to the ambient air by an exhaust passage 24 in which is disposed a valve assembly 26 of conventional construction.
  • the valve assembly 26 comprises a valve element 28 formed by a rod 30 and a valve head 32 which is intended to cooperate with a seat 34 under the effect of a spring (not shown) to close the passage 24.
  • valve element 28 When the valve opens, the valve element 28 is moved in the direction of the arrow towards the interior of the combustion chamber 14 under the effect of an actuating means such as a shaft cam (not shown).
  • the valve assembly 22 comprises a valve element 36 formed by a rod 38 and a valve head 40.
  • the valve assembly 22 further comprises a seat 42 mounted movable relative to the cylinder head 21.
  • the seat is a substantially annular part which is made of metal, for example steel , or in sintered material.
  • the seat 42 has a chamfered surface 44 intended to cooperate in leaktight fashion with a corresponding surface 46 formed on the head 40 of the valve element 36.
  • the seat 42 is slidably mounted in a stepped bore 48 formed in the cylinder head 21 and comprising a bearing surface 60.
  • the seal between the seat 42 and the bore 48 is ensured by two O-rings 50 and 52 each received in an annular groove formed on the periphery of the seat 42.
  • the seat 42 further comprises a metallic segment 54, substantially annular, which is received in a groove 56 also formed in the periphery of the seat and which thus seals between the seat 42 and the stepped bore 48.
  • An annular washer 58 is disposed on the bearing surface 60 of the 'stepped bore 48 and serves to ensure a slight spacing between the seat 42 and the bearing 60.
  • valve element 36 is opened in the direction of arrow 62, the valve head 40 moving away from the combustion chamber 14.
  • the head valve 40 occupies the position shown in dotted lines.
  • the valve member 36 moves in the opposite direction of the arrow 62 under the effect of the camshaft and the valve head 40 abuts on the seat 42.
  • the seat 42 serves to reinforce the closing of the valve assembly 22 when the mixture is ignited in the chamber 14.
  • the pressure generated in the combustion chamber 14 acts on the annular section of the seat 42 and tends to move it in the stepped bore 48 in the direction of arrow 62 towards the valve head 40.
  • the seal between the two chamfered surfaces 44 and 46 is thus ensured.
  • valve assembly 22 takes place in such a way that the valve head 40 moves away from the combustion chamber 14 has certain advantages compared to a valve assembly of conventional construction. Opening the valve assembly 28 toward the interior of the combustion chamber 14 requires that the upper surface 16 of the piston 12 have a substantially concave zone 64 to avoid any untimely contact between the valve head 32 and the upper surface. 16 of the piston 12. The presence of this concave zone 64 can have harmful effects on the combustion of the gasoline / air mixture in the combustion chamber 14. On the other hand, with the valve assembly 22 according to the invention, the head of valve 40 never enters the combustion chamber and therefore the upper surface 16 of the piston can be formed so as to optimize combustion.
  • a camshaft 66 has several cam surfaces 68, each for cooperating with a valve assembly.
  • the cam surface 68 cooperates with the end of the rod 38 of the valve element 36 by means of a roller 70 mounted freely in rotation in a cage 72.
  • the cage 72 of substantially cylindrical shape, is received around the rod 38 in a cylindrical housing 74 formed in the cylinder head 21.
  • a compression spring 76 is disposed around the rod 38 and retained between the bottom 78 of the housing 74 and an annular flange 80 fixedly mounted on the rod 38 by two collets 82. The spring 76 thus tends to open the valve assembly 22.
  • the valve assembly 22 is closed by the action of the cam surface 68 which acts on the valve stem 38 via of the roller 70.
  • the closure of the valve assembly 22 is reinforced, during the explosion, by the seat 42 which tends to move towards the valve head 40.
  • FIG. 4 A second type of actuating means for the valve assembly 22 is shown in Figure 4.
  • the valve assembly is closed in a manner substantially similar to that of Figure 3a.
  • the actuating means comprises a lever 84 pivotally mounted on an axis 86 fixed on the cylinder head 21.
  • the lever 84 has an end 88 in the form of a fork and which passes through an opening 90 in the cage 72 and bears on the face bottom of the annular flange 80.
  • the other end 92 of the lever 84 is intended to cooperate with a cam surface 94 of a camshaft 96.
  • the closure of the valve assembly 22 is done as for the embodiment of Figure 3a.
  • FIG. 5 A second type of mounting of the seat 42 in the cylinder head 21 is shown in FIG. 5.
  • the seat 42 is mounted in the bore 48 by means of a washer 100 made of flexible steel whose periphery is received in a sealed manner in a groove 102 formed in the wall 104 of the bore 48.
  • the inner edge 106 of the washer 100 rests, in a sealed manner, on a bearing surface 108 formed on the seat 42.
  • the seat 42 is therefore mounted in sealed manner by relative to the cylinder head 21, but it is free to move slightly, under the effect of the pressure in the combustion chamber 14, to reinforce the closing of the valve assembly 22.
  • the valve assembly In order to cool the seat 42, it is possible to envisage circulating oil in the annular space 98 formed between the O-rings 50 and 52. When it is closed, the valve assembly, on approaching the combustion chamber, causes the passage of a quantity of the air / petrol mixture in the passage 20 towards the interior of the combustion chamber 14. The closure valve assembly therefore increases the filling rate and thus improves the efficiency of the engine.
  • the present invention can be applied to all kinds of internal combustion engine, for example, four-stroke or two-stroke engines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Lift Valve (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP90400437A 1989-02-17 1990-02-16 Ventilanordnung für Brennkraftmaschinen Withdrawn EP0383695A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8902127 1989-02-17
FR8902127A FR2643417B1 (fr) 1989-02-17 1989-02-17 Ensemble de soupape pour moteurs a explosion

Publications (1)

Publication Number Publication Date
EP0383695A1 true EP0383695A1 (de) 1990-08-22

Family

ID=9378905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400437A Withdrawn EP0383695A1 (de) 1989-02-17 1990-02-16 Ventilanordnung für Brennkraftmaschinen

Country Status (7)

Country Link
US (1) US4977869A (de)
EP (1) EP0383695A1 (de)
JP (1) JPH03199605A (de)
KR (1) KR900013175A (de)
BR (1) BR9000717A (de)
CA (1) CA2010123A1 (de)
FR (1) FR2643417B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105765183A (zh) * 2013-07-26 2016-07-13 Ibos创新有限公司 活塞式机器

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5694893A (en) * 1996-04-22 1997-12-09 Caterpillar Inc. Outward opening valve system for an engine
US5615646A (en) * 1996-04-22 1997-04-01 Caterpillar Inc. Method and apparatus for holding a cylinder valve closed during combustion
US5636602A (en) * 1996-04-23 1997-06-10 Caterpillar Inc. Push-pull valve assembly for an engine cylinder
KR20030048175A (ko) * 2001-12-11 2003-06-19 현대자동차주식회사 엘피지 엔진용 밸브시트구조
FR2854426A1 (fr) * 2003-04-29 2004-11-05 Jean Claude Morsillo Soupape de moteur a combustion interne dont l'ouverture se fait a l'exterieur de la chambre de combustion
US7213547B2 (en) * 2004-12-14 2007-05-08 Massachusetts Institute Of Technology Valve
JP2010043634A (ja) * 2008-08-10 2010-02-25 Osamu Nakada 燃焼室に飛び出さない、ピストンバルブ。
JP2010048247A (ja) * 2008-08-22 2010-03-04 Osamu Nakada 燃焼室に飛び出さない、筒状のピストンバルブ。
US20130152572A1 (en) * 2011-12-16 2013-06-20 Jeffrey Madderno Valve activation in compressed-gas energy storage and recovery systems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH217036A (de) * 1939-06-17 1941-09-30 Heylandt Paul Dr Ing E H Einrichtung an Kolbenmaschinen mit walzenförmigem, parallel zur Kurbelwelle im Zylinderkopf liegendem Drehschieber zur Abdichtung desselben gegen die Zylinder.
CH236456A (de) * 1943-02-06 1945-02-15 Eduard Dr Woydt Schieberabdichtung für Kolbenmaschinen.
FR2518166A1 (fr) * 1981-12-16 1983-06-17 Daimler Benz Ag Dispositif de guidage de la tige d'une soupape dans un moteur a combustion interne
EP0152321A1 (de) * 1984-02-03 1985-08-21 Elf France Anlage zur Kontrolle für das Öffnen und Schliessen der Brennkammer einer Brennkraftmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424738A (en) * 1945-07-31 1947-07-29 Wilhelm B Bronander Valve mechanism
US3168083A (en) * 1962-10-22 1965-02-02 Lucian F Buchanan Internal combustion engine exhaust valve assembly
US3289658A (en) * 1965-10-20 1966-12-06 Sr Thomas A Surovek Valve arrangement for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH217036A (de) * 1939-06-17 1941-09-30 Heylandt Paul Dr Ing E H Einrichtung an Kolbenmaschinen mit walzenförmigem, parallel zur Kurbelwelle im Zylinderkopf liegendem Drehschieber zur Abdichtung desselben gegen die Zylinder.
CH236456A (de) * 1943-02-06 1945-02-15 Eduard Dr Woydt Schieberabdichtung für Kolbenmaschinen.
FR2518166A1 (fr) * 1981-12-16 1983-06-17 Daimler Benz Ag Dispositif de guidage de la tige d'une soupape dans un moteur a combustion interne
EP0152321A1 (de) * 1984-02-03 1985-08-21 Elf France Anlage zur Kontrolle für das Öffnen und Schliessen der Brennkammer einer Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105765183A (zh) * 2013-07-26 2016-07-13 Ibos创新有限公司 活塞式机器
EP3025032A4 (de) * 2013-07-26 2017-03-22 Ibos Innovations Pty Ltd. Kolbenmaschine

Also Published As

Publication number Publication date
CA2010123A1 (fr) 1990-08-17
JPH03199605A (ja) 1991-08-30
BR9000717A (pt) 1991-01-22
US4977869A (en) 1990-12-18
FR2643417A1 (fr) 1990-08-24
KR900013175A (ko) 1990-09-03
FR2643417B1 (fr) 1991-03-29

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

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Effective date: 19920116

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Owner name: ELF ANTAR FRANCE

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Withdrawal date: 19921230