EP0864729A1 - Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen - Google Patents
Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen Download PDFInfo
- Publication number
- EP0864729A1 EP0864729A1 EP97103697A EP97103697A EP0864729A1 EP 0864729 A1 EP0864729 A1 EP 0864729A1 EP 97103697 A EP97103697 A EP 97103697A EP 97103697 A EP97103697 A EP 97103697A EP 0864729 A1 EP0864729 A1 EP 0864729A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- cage
- rolling elements
- pockets
- spring
- 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
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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
- F01L1/32—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 device for rotating a valve for internal combustion engines during opening or Closing movement of the valve using rolling elements, which are arranged concentrically around the axis of a base body Bags with inclined planes due to tangential compressible springs when the rolling elements are loaded Towards the flatter sides of the pockets and with one opposite the pockets in the valve axis direction exciting spring element interact, the Rolling elements are relieved alternately in the valve axis direction and to relative rotation of the base body relative to the spring element be increasingly burdened.
- valve rotators in gasoline and diesel engines to use the axially acting, increasing valve spring force when opening the valve take advantage of the rotation to evoke.
- the valve rotates a few degrees during opening, however, no rotational movement during the closing movement more to avoid unnecessary wear on the valve seat.
- tangentially acting coil springs Torqueential Springs
- steel balls at the top of oblique raceways of a base body pressed.
- a disc spring On the inside edge a disc spring is supported on the base body, over which grips a cover to initiate the valve spring forces. opens the valve, the diaphragm spring is increased by the Valve spring force flattened. In doing so, it burdens the balls located in the pockets of the basic body, forces them for rolling on their sloping tracks and rolls itself on the balls.
- the rotational movement generated in this way corresponds the double path of the balls.
- the lid and disc spring are non-rotatable due to frictional engagement connected with each other.
- the relative rotation between Belleville washer / cover and base body is placed over the cover, valve springs, Transfer the spring plate and cone pieces to the valve.
- the diaphragm spring is relieved and thus the balls, which then roll through without the tangential springs are pushed back into their original position will.
- German patent 1 955 820 and the German Auslegeschrift 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 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 and run balls in oblique pockets relieve that a rotation occurs over the disc springs, which is used to turn the valve.
- a high level of operational reliability is expected from valve turning devices. Under normal operating conditions and appropriate maintenance, the service life of the turning devices in large motors is expected to be 10,000 hours and more. For motors that run for a short time in the overload range, and in the case of non-stationary operation, the loads on the turning devices increase considerably. Due to their small dimensions, sensitive components are the tangential springs. Due to the dynamic overload mentioned, they are damaged or even completely destroyed by the balls that move uncontrollably. A damaged tangential spring impairs the function of the rotating device and in most cases initiates its complete failure.
- the invention has for its object the described Form valve turning devices so that by short-term uncontrolled vibrations that occur of rolling elements and tangential springs and as a result Damage can be avoided.
- the invention draws as a solution is characterized in that within the body pockets elements arranged to limit the movement distances of the rolling elements are. That makes it accurate in all operating situations determinable rolling path of the rolling elements leaves an uncontrolled Squeeze the tangential spring or roll it over not to the rolling elements.
- the movement of the rolling elements is preferably controlled by a Limited stop within the pockets. That attack can be caused by a narrowing of the diameter of the pockets or by a cage is formed in which a tangential spring is anchored and that is put in the pocket.
- the spring cage has a defined length that is determined so that the Rolling elements can only perform a predetermined movement and the tangential spring also prevents deflection. This will make it sustainable against damage from Rollover protected.
- the cage can be made of plastic, of sheet metal as well as in the metal sintering process or by means of investment casting will.
- valve turning devices which the valve during the closing movement Communicate rotation.
- a plate spring 1 is supported on rolling elements 2 and stretched flat. Since they are shown Example additionally on balls 6 in a concentric Supports parallel path, the rolling elements 2 are under tension Belleville spring 1 relieved. The balls 6 form support points, so that the disc spring has a lever-like effect.
- the rolling elements 2 run in pocket-shaped recesses 4 of a basic body 3. There are raceways in the pockets Inclinations, for example with the angle ⁇ , against the plane the tensioned Belleville washer provided on it during roll their movement.
- a compression spring 8, for example a coil spring ensures that the rolling elements 2 at a relief always in the flatter side of the pocket-shaped Recesses are pressed.
- a lid 7 transmits the Forces P1-P2 of the valve springs, not shown, on the Belleville spring 1.
- Figures 1 and 2 show the rotating device when fully open Valve with tensioned disc spring 1 and the position of the Rolling elements 2 in the end position before the 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 possibly rolling over the coil spring 8.
- the length of the spring cage, which in the Pocket 4 is set, determines the movement distance of the Bullets. 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)
Abstract
Description
Bei Motoren, die kurzzeitig im überlastbereich laufen, und bei einem instationären Betrieb steigen die Belastungen der Drehvorrichtungen jedoch ganz erheblich. Empfindliche Bauteile sind hierbei infolge ihrer geringen Abmessungen die Tangentialfedern. Sie werden aufgrund der erwähnten dynamischen über last von den sich dann unkontrolliert bewegenden Kugeln beschädigt oder sogar vollends zerstört. Eine beschädigte Tangentialfeder führt zu einer Beeinträchtigung der Funktion der Drehvorrichtung und leitet in den meisten Fällen deren kompletten Ausfall ein.
- Figur 1
- einen Teil eines Tangentialschnitts einer Drehvorrichtung auf dem Kugelteilkreis (Radius r) bei voll geöffnetem Ventil,
- 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 und
- Figur 6
- die Draufsicht auf die Ausführung gem. Figur 5.
Claims (8)
- Vorrichtung zum Drehen eines Ventils für Brennkraftmaschinen während der Öffnungs- oder Schließbewegung des Ventils unter Verwendung von Wälzkörpern, die in konzentrisch um die Achse eines Grundkörpers angeordneten Taschen mitschiefen Ebenen durch tangential wirkende, bei Belastung der Wälzkörper zusammendrückbare Federn in Richtung auf die flacheren Seiten der Taschen belastet werden und mit einem den Taschen gegenüberliegenden, in Ventilachsrichtung spannenden Federelement zusammenwirken, wobei die Wälzkörper abwechselnd in Ventilachsrichtung entlastet und zum relativen Verdrehen des Grundkörpers gegenüber dem Federelement zunehmend belastet werden, dadurch gekennzeichnet, daß innerhalb der Taschen (4) Elemente (9, 10) zum Begrenzen der Bewegungsstrecken der Wälzkörper (2) angeordnet sind.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Bewegung der Wälzkörper durch einen Anschlag innerhalb der Taschen begrenzt wird.
- Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Anschlag durch eine Durchmesserverengung (9) der Taschen gebildet wird.
- Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Anschlag aus einem Käfig (10) für die Tangentialfedern (8) besteht.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Käfig aus Kunststoff gefertigt ist.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Käfig aus Blech hergestellt ist.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Käfig durch ein Metallsinterverfahren hergestellt ist.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Käfig durch ein Feingußverfahren gefertigt ist.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97103697A EP0864729B1 (de) | 1997-03-06 | 1997-03-06 | Vorrichtung zum Drehen eines Ventils für Verbrennungskraft-maschinen |
DE59710043T DE59710043D1 (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 true EP0864729A1 (de) | 1998-09-16 |
EP0864729B1 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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1811137A2 (de) * | 2006-01-24 | 2007-07-25 | TRW Automotive GmbH | Ventildrehvorrichtung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2075752A5 (de) * | 1970-01-27 | 1971-10-08 | Maerkisches Werk Gmbh | |
GB2040399A (en) * | 1979-01-11 | 1980-08-28 | 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
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2075752A5 (de) * | 1970-01-27 | 1971-10-08 | Maerkisches Werk Gmbh | |
GB2040399A (en) * | 1979-01-11 | 1980-08-28 | 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 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1811137A2 (de) * | 2006-01-24 | 2007-07-25 | TRW Automotive GmbH | Ventildrehvorrichtung |
EP1811137A3 (de) * | 2006-01-24 | 2010-03-10 | TRW Automotive GmbH | Ventildrehvorrichtung |
Also Published As
Publication number | Publication date |
---|---|
EP0864729B1 (de) | 2003-05-07 |
DE59710043D1 (de) | 2003-06-12 |
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