EP0864729B1 - Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen - Google Patents
Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen Download PDFInfo
- Publication number
- EP0864729B1 EP0864729B1 EP97103697A EP97103697A EP0864729B1 EP 0864729 B1 EP0864729 B1 EP 0864729B1 EP 97103697 A EP97103697 A EP 97103697A EP 97103697 A EP97103697 A EP 97103697A EP 0864729 B1 EP0864729 B1 EP 0864729B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fact
- base body
- cage
- pockets
- 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 - Lifetime
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
- F01L1/32—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for rotating lift valves, e.g. to diminish wear
-
- 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
- F01L2301/00—Using particular materials
Definitions
- the invention relates to a valve turning device for turning a poppet valve for internal combustion engines during the Opening or closing movement of the valve using of spherical rolling elements which are concentric around the Axis of a body of the valve rotating device arranged body pockets with inclined planes through in the pockets act tangentially when the rolling elements are loaded compressible springs towards the flatter sides the bags are loaded and with one of the bags opposite, in the valve axis direction through the Valve closing spring exciting, disc-shaped spring element, the one serving as a valve spring support Device lid is resilient, cooperate with the Rolling elements of this spring element alternately in Valve axis direction for its relative rotation with respect to Base body alternately relieved and loaded.
- tangentially acting coil springs tangential springs
- steel balls pressed against the upper end of oblique raceways of a base body.
- tangential springs tangential springs
- On a disc spring is supported on the inner edge of the base body, via which to Initiation of the valve spring forces a cover engages. opens the valve, the Disc spring flattened due to the increasing valve spring force. In doing so, it burdens balls in the pockets of the body force them to roll off their sloping tracks and rolls themselves on the balls. Your so generated Rotational movement corresponds to the double rolling path of the balls.
- the pressure of the disc spring on the inner edge of the base body reduced so that sliding takes place here.
- Lid and disc spring are non-rotatably connected by friction.
- the relative rotation between Belleville washer / cover and base body is over cover, valve springs, valve spring retainer and transfer cone pieces to the valve.
- A occurs when the valve closes Relief of the plate spring and thus the balls, which then roll through without the tangential springs are pushed back into their starting position.
- German Patent 1 955 shows 820 and German Offenlegungsschrift 21 10 708 devices which the rotation of a valve with the help of a disc-shaped Spring element cause stored energy. Further Possibilities of a valve rotation during the closing stroke shows the German Offenlegungsschrift 30 04 320.
- a disk-shaped spring (disc spring) is used as a translation element used to load balls in sloping pockets relieve that a rotation occurs over the disc springs, which is used to turn the valve.
- Valve turning devices have high operational reliability expected. Under normal operating conditions and Appropriate maintenance is carried out with a service life of the turning devices calculated in large engines of 10,000 hours and more.
- Sensitive components are the tangential springs due to their small dimensions. They are dynamic due to the mentioned Overload from the balls moving uncontrollably damaged or even completely destroyed. A damaged one Tangential spring affects the function the rotating device and in most cases directs it complete failure.
- the invention has for its object the described Form valve turning devices so that by short-term Uncontrolled vibrations that occur when overloaded of rolling elements and tangential springs and as a result Damage can be avoided.
- the invention draws as a solution is characterized in that the body pockets stop elements to limit the movement distances of the rolling elements. The one that can be precisely determined in all operating situations Rolling path of the rolling elements leaves an uncontrolled Squeeze the tangential spring or roll it over the rolling elements.
- Stop elements are formed by a cage in which a Tangential spring is anchored and inserted into the pocket becomes.
- the spring cage has a defined length, like this it is determined that the rolling element only a predetermined movement can perform and the tangential spring additionally on one Deflection prevents. This will be sustainable against one Damage protected by rolling over.
- the cage can be out Plastic, sheet metal and in the metal sintering process or be produced by investment casting.
- a plate spring 1 is supported on rolling elements 2 and flat curious; excited. Since in the example shown they are also on balls 6 in one concentric parallel path ( Figures 2 and 4) supports, the rolling elements 2 at tensioned disc spring 1 relieved. The balls 6 form support points, see above that the disc spring has a lever-like effect.
- the rolling elements 2 run in pocket-shaped recesses 4 one Basic body 3.
- the pockets are raceways with inclinations, for example with the angle ⁇ , provided against the plane of the tensioned disc spring which they roll off as they move.
- Compression springs 8 for example Coil spring, ensure that the rolling elements 2 always with a relief are pressed against the flatter ends of the pocket-shaped recesses.
- a cover 7 transmits the forces P1-P2 of the valve springs, not shown the disc spring 1.
- Figures 1 and 2 show the rotating device with the valve fully open tensioned disc spring 1 and the position of the rolling elements 2 in the end position Start of rotation.
- the tangential springs 8 previously have the balls 2 in them achievable lowest depth of the inclined raceways 4 pressed, so that they both the disc spring 1 and the Touch raceways 4.
- FIGS. 3 and 4 show the state when the rotation has ended shown.
- the balls 2 are in the reachable for them greatest depth of the raceways 4. They are out of position 1 rolled to position 2 and have a translation by the angle ⁇ , FIG. 4, with the taxiway r x ⁇ , FIG. 3, executed so that the plate spring 1 rotated by 2 ⁇ and has covered the taxiway 2r x ⁇ .
- the raceways 4 of the balls 2 are approximately in the area of the transition from the deepest area to the inclined, flattening Area with constrictions in diameter 9 to limit the rolling movement the balls 2 provided. This narrowing in diameter form stops to which the balls stick when uncontrolled Can create movements. This will cause excessive squeezing the coil springs 8 with all negative consequences prevented.
- Figures 5 and 6 show that the roll limitation the balls 2 is limited by a spring cage 10.
- the front end of the spring cage 10 serves as a ball stop and prevents it from compressing too far and rolling over if necessary the coil spring 8.
- the length of the spring cage, which in the Pocket 4 is set, determines the movement distance of the Balls. At the same time, the cage prevents any deflection the spring, which is therefore sustainable against damage is protected.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
- Figur 1
- einen Teil eines Tangentialschnitts einer Drehvorrichtung auf dem Kugelteilkreis (Radius r) bei voll geöffnetem Ventil, (Stand der Technik).
- Figur 2
- die Drehvorrichtung gem. Figur 1 in der Draufsicht,
- Figur 3
- den Tangentialschnitt durch die Drehvorrichtung nach den Figuren 1 und 2 bei beendeter Drehung nach der Ventilschließung,
- Figur 4
- die Draufsicht auf die Ventildrehvorrichtung nach beendeter Drehung,
- Figur 5
- einen Tangentialschnitt durch eine Drehvorrichtung bei voll geöffnetem Ventil mit einem Wälzkörperkäfig gemäß der Erfindung und
- Figur 6
- die Draufsicht auf die Ausführung gemäß Figur 5 bei voll geöffnetem Ventil.
Claims (6)
- Ventildrehvorrichtung zum Drehen eines Tellerventils für Brennkraftmaschinen während der Öffnungs- oder Schließbewegung des Ventils unter Verwendung von kugelförmigen Wälzkörpern (2), die in konzentrisch um die Achse eines Grundkörpers (3) der Ventildrehvorrichtung angeordneten Grundkörpertaschen (4) mit schiefen Ebenen durch in den Taschen tangential wirkende, bei Belastung der Wälzkörper zusammendrückbare Federn (8) in Richtung auf die flacheren Seiten der Taschen belastet werden und mit einem den Taschen gegenüberliegenden, in Ventilachsrichtung durch die Ventilschließfeder spannenden, scheibenförmigen Federelement (1), das über einen als Ventilfederauflage dienenden Vorrichtungsdeckel (7) belastbar ist, zusammenwirken, wobei die kugelförmigen Wälzkörper von diesem Federelement (1) in Ventilachsrichtung zu dessen relativer Drehung gegenüber dem Grundkörper (3) abwechselnd entlastet und belastet werden,
dadurch gekennzeichnet, daß innerhalb jeder Grundkörpertasche ein Käfig (10) für die Tangentialfedern (8) angeordnet ist. - Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jede Grundkörpertasche (4) eine Durchmesserverengung (9) aufweist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Käfig aus Kunststoff gefertigt ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Käfig aus Blech hergestellt ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Käfig aus gesintertem Metall besteht.
- Vorrichtung nach einem der vorhergehenden Ansprüche dadurch gekennzeichnet, daß der Käfig aus einem Feingußwerkstoff besteht.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59710043T DE59710043D1 (de) | 1997-03-06 | 1997-03-06 | Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen |
EP97103697A EP0864729B1 (de) | 1997-03-06 | 1997-03-06 | Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97103697A EP0864729B1 (de) | 1997-03-06 | 1997-03-06 | Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0864729A1 EP0864729A1 (de) | 1998-09-16 |
EP0864729B1 true EP0864729B1 (de) | 2003-05-07 |
Family
ID=8226558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97103697A Expired - Lifetime EP0864729B1 (de) | 1997-03-06 | 1997-03-06 | Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0864729B1 (de) |
DE (1) | DE59710043D1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006001077U1 (de) * | 2006-01-24 | 2006-03-23 | Trw Automotive Gmbh | Ventildrehvorrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7100716A (de) * | 1970-01-27 | 1971-07-29 | ||
GB2040399B (en) * | 1979-01-11 | 1983-01-26 | Fjr Eng Ltd | Valve rotator |
DE3305421A1 (de) * | 1983-02-17 | 1984-08-23 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | Vorrichtung zum drehen der ventile in verbrennungskraftmaschinen |
-
1997
- 1997-03-06 DE DE59710043T patent/DE59710043D1/de not_active Expired - Fee Related
- 1997-03-06 EP EP97103697A patent/EP0864729B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0864729A1 (de) | 1998-09-16 |
DE59710043D1 (de) | 2003-06-12 |
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