EP0781898A1 - Verbesserungen an Brennkraftmaschinen - Google Patents

Verbesserungen an Brennkraftmaschinen Download PDF

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Publication number
EP0781898A1
EP0781898A1 EP96490045A EP96490045A EP0781898A1 EP 0781898 A1 EP0781898 A1 EP 0781898A1 EP 96490045 A EP96490045 A EP 96490045A EP 96490045 A EP96490045 A EP 96490045A EP 0781898 A1 EP0781898 A1 EP 0781898A1
Authority
EP
European Patent Office
Prior art keywords
valve
seat
valves
cylinder
exhaust valve
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Withdrawn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
EP96490045A
Other languages
English (en)
French (fr)
Inventor
Maurice-André Tacquet
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0781898A1 publication Critical patent/EP0781898A1/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Withdrawn legal-status Critical Current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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/28—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of coaxial valves; characterised by the provision of valves co-operating with both intake and exhaust ports
    • F01L1/285—Coaxial intake and exhaust valves
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams

Definitions

  • the present invention relates to an internal combustion reciprocating engine cylinder head equipped with an intake valve and an exhaust valve per cylinder.
  • the valves are concentric with each other and the cylinder.
  • the exhaust valve is housed inside the intake valve and rests on it to ensure gas tightness of the cylinder.
  • the exhaust valve of annular shape, slides on a central post which is used as housing for the fuel injector for diesel engines or the spark plug for "otto" engines.
  • the displacement of the two valves is obtained by means of a single cam per cylinder and by means of a volume of oil supplied under pressure.
  • the invention generally relates to reciprocating internal combustion engines operating according to the 4-stroke cycle equipped with cylinder heads comprising intake valves and exhaust valves.
  • cylinder heads fitted with an intake valve and an exhaust valve per cylinder and the exhaust valve of which is concentric with the intake valve and housed therein.
  • the control of the two valves can be obtained by a single cam.
  • the intake and exhaust valves are separate and are supported by seats housed in the cylinder head. The movements of the intake and exhaust valves are controlled separately.
  • a camshaft fitted with one cam per cylinder pushes a "hydraulic control piston” which actuates the valves via a "volume of control oil supplied under pressure.
  • Part of the stroke of the control piston corresponds to the movement of the valve assembly while the other part of the stroke of the piston controls the movement of the exhaust valve alone, the intake valve then resting on its seat .
  • the parts exposed to combustion as well as the rubbing parts are cooled by an oil circulation.
  • the metal return spring is cooled by a flow of air taken from the charge air supply.
  • the exhaust valve is pressed against its seat by oil pressure.
  • the inside diameter of the exhaust seat is smaller than the guide diameter of the valve so that the higher the gas pressure in the cylinder, the higher the contact pressure of the exhaust valve on his seat.
  • the return spring has sufficient force to overcome the force which results from the pressure of the gases in the cylinder at the end of the rebound stroke.
  • the exhaust valve lift law is fast, because as soon as the valve is lifted off, the gas pressure adds to the force of the spring.
  • the space between the exterior of the exhaust valve and the interior of the intake valve forms the exhaust duct.
  • the section of this duct is made in such a way that it constitutes a diffuser which optimizes the flow of gases.
  • the single cam per cylinder actuates the two valves via a "hydraulic control piston” and a “control oil volume”.
  • This piston is also provided with a metal return spring. It has an end stop which allows to create a clearance between the piston, the roller and the cam when the exhaust valve is in the fully open position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP96490045A 1995-11-29 1996-11-20 Verbesserungen an Brennkraftmaschinen Withdrawn EP0781898A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9514507A FR2741668B1 (fr) 1995-11-29 1995-11-29 Perfectionnements aux moteurs alternatifs a combustion interne, ceux-ci comportant des culasses a soupapes concentriques
FR9514507 1995-11-29

Publications (1)

Publication Number Publication Date
EP0781898A1 true EP0781898A1 (de) 1997-07-02

Family

ID=9485258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96490045A Withdrawn EP0781898A1 (de) 1995-11-29 1996-11-20 Verbesserungen an Brennkraftmaschinen

Country Status (2)

Country Link
EP (1) EP0781898A1 (de)
FR (1) FR2741668B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000058609A1 (fr) * 1999-03-23 2000-10-05 Igors Pancakovs Mecanisme repartiteur de gaz pour moteur a combustion interne
CZ303732B6 (cs) * 2011-05-03 2013-04-10 Knob Engines S.R.O. Hlava válce spalovacího motoru s prstencovým ventilem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE200793C (de) *
GB416496A (en) * 1933-03-15 1934-09-17 Charles Edward Maclea March Improvements in or relating to valves for fluid pressure engines
FR852101A (fr) * 1939-03-25 1940-01-24 Pour une culasse de moteur à gaz à soupapes combinées l'une dans l'autre, réfrigérées, à commande unique et chambre de réserve de gaz refoulés
WO1995008052A1 (fr) * 1993-09-13 1995-03-23 S.N.C. Melchior Technologie Perfectionnement aux moteurs a combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE200793C (de) *
GB416496A (en) * 1933-03-15 1934-09-17 Charles Edward Maclea March Improvements in or relating to valves for fluid pressure engines
FR852101A (fr) * 1939-03-25 1940-01-24 Pour une culasse de moteur à gaz à soupapes combinées l'une dans l'autre, réfrigérées, à commande unique et chambre de réserve de gaz refoulés
WO1995008052A1 (fr) * 1993-09-13 1995-03-23 S.N.C. Melchior Technologie Perfectionnement aux moteurs a combustion interne

Also Published As

Publication number Publication date
FR2741668B1 (fr) 1998-03-20
FR2741668A1 (fr) 1997-05-30

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