EP0781898A1 - Verbesserungen an Brennkraftmaschinen - Google Patents
Verbesserungen an Brennkraftmaschinen Download PDFInfo
- 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- Withdrawn
Links
Images
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)
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)
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)
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 |
-
1995
- 1995-11-29 FR FR9514507A patent/FR2741668B1/fr not_active Expired - Fee Related
-
1996
- 1996-11-20 EP EP96490045A patent/EP0781898A1/de not_active Withdrawn
Patent Citations (4)
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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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 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
17P | Request for examination filed |
Effective date: 19980119 |
|
18W | Application withdrawn |
Withdrawal date: 19980319 |