DE102011003903A1 - Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve - Google Patents
Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve Download PDFInfo
- Publication number
- DE102011003903A1 DE102011003903A1 DE102011003903A DE102011003903A DE102011003903A1 DE 102011003903 A1 DE102011003903 A1 DE 102011003903A1 DE 102011003903 A DE102011003903 A DE 102011003903A DE 102011003903 A DE102011003903 A DE 102011003903A DE 102011003903 A1 DE102011003903 A1 DE 102011003903A1
- Authority
- DE
- Germany
- Prior art keywords
- valve
- internal combustion
- cam
- adjusting bolt
- combustion engines
- 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- Withdrawn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
- 238000002485 combustion reaction Methods 0.000 title claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 3
- OEHFRZLKGRKFAS-UHFFFAOYSA-N droxicam Chemical compound C12=CC=CC=C2S(=O)(=O)N(C)C(C2=O)=C1OC(=O)N2C1=CC=CC=N1 OEHFRZLKGRKFAS-UHFFFAOYSA-N 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 3
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Gebiet der ErfindungField of the invention
Ventiltrieb für Brennkraftmaschinen mit Ventilspielausgleichselementen zur mechanischen, automatischen Nachstellung von Gaswechselventilen, die einen Stellbolzen aufweisen, der gegen die Kraft einer Feder in einer an einem Bauteil der Brennkraftmaschine angeordneten Hülse abstützbar ist, wobei mit einem Stützkopf des Stellbolzens ein Übertragungselement in Wirkverbindung steht, das sich an einem federbelasteten Gaswechselventil und an einem Nocken einer von der Brennkraftmaschine angetriebenen Nockenwelle abstützt.Valve drive for internal combustion engines with valve clearance compensation elements for mechanical, automatic readjustment of gas exchange valves having an adjusting bolt, which is supported against the force of a spring in a arranged on a component of the internal combustion engine sleeve, with a support head of the adjusting bolt, a transmission element is in operative connection, the is supported on a spring-loaded gas exchange valve and on a cam of a camshaft driven by the internal combustion engine.
Hintergrund der ErfindungBackground of the invention
Ein Ventiltrieb für Brennkraftmaschinen mit Spielausgleichselementen zur mechanischen, automatischen Nachstellung der Gaswechselventile ist aus der
Es hat sich weiterhin gezeigt, dass bei leerlaufnahen Drehzahlen der Brennkraftmaschine sich das Absinken des Stellbolzens deutlich vergrößern kann, in Extremfällen kann der Stellbolzen sogar vollständig absinken, da der Impuls aus dem Ventiltrieb und damit die Abstützkraft auf den Stellbolzen zum definierten Klemmen zu klein ist. Das bedeutet, dass sich im Ventilausgleichselement eine Gleitbewegung einstellt, die zu Funktionsausfall oder zumindest deutlichem Ventilhubverlust mit erhöhtem Verschleiß, Geräuschbildung und dergleichen führen kann.It has also been shown that at idle speeds of the engine, the drop in the adjusting bolt can increase significantly, in extreme cases, the adjusting bolt even completely fall, because the pulse from the valve train and thus the supporting force on the adjusting bolt for defined clamping is too small. This means that sets in the valve compensation element, a sliding movement that can lead to functional failure or at least significant valve lift loss with increased wear, noise and the like.
Aufgabe der ErfindungObject of the invention
Aufgabe der Erfindung ist es daher, ein Ventiltrieb für Brennkraftmaschinen der beschriebenen Art zu verbessern. Dabei sollen auch die beschriebenen Nachteile in Verbindung mit dem Absinken des Stellbolzens im Ventilspielausgleichselement mit einfachen und kostengünstigen Mitteln behoben werden.The object of the invention is therefore to improve a valve train for internal combustion engines of the type described. In this case, the disadvantages described in connection with the decrease of the adjusting bolt in the valve clearance compensation element should be remedied with simple and inexpensive means.
Zusammenfassung der ErfindungSummary of the invention
Die Aufgabe der Erfindung wird dadurch gelöst, dass der Nocken auf der Einlaufseite des Nockens in Drehrichtung des Nockens gesehen einen Vornocken aufweist.The object of the invention is achieved in that the cam on the inlet side of the cam seen in the direction of rotation of the cam has a pilot cam.
Durch diese Ausgestaltung des Nockens mit Vornocken erfolgt auch bei niedrigen Drehzahlen ein für die Klemmung wichtiger kurzer Kraftimpuls, so dass das beschriebene Absinken vermieden wird. Generell findet bei der vorgeschlagenen Ausgestaltung der Klemmvorgang im Bereich des Vornockens statt, so dass immer eine hinreichende Klemmung oder Sperrung des Stellbolzens in der Hülse gegeben ist. Auch bei höheren Drehzahlen begünstigt der kurze Kraftimpuls das Absinken.This configuration of the cam with pre-cams also takes place at low speeds an important for the clamping short power pulse, so that the described drop is avoided. Generally, in the proposed embodiment, the clamping operation takes place in the region of the pre-cam, so that there is always sufficient clamping or blocking of the adjusting bolt in the sleeve. Even at higher speeds, the short power pulse favors the sinking.
Der Vornocken ist in vorteilhafter Weise in die Einlauframpe integriert und Bestandteil derselben, sodass eine einfache Herstellung möglich ist.The pilot cam is advantageously integrated in the inlet ramp and part of the same, so that a simple production is possible.
Für das sichere Klemmen durch den Vornocken ist es bedeutsam, dass die Höhe des Vornockens größer ist als das maximale Spiel im Ventiltrieb, einschließlich des Spiels im Ausgleichselement, da dadurch gewährleistet ist, dass immer ein Impuls auf das Ausgleichselement iniziert wird.For the purpose of securely clamping by the pilot cam, it is important that the amount of pre-cam is greater than the maximum play in the valvetrain, including the play in the counterbalance, as this ensures that one impulse is always injected onto the counterbalance.
In weiterer Ausgestaltung der Erfindung wird vorgeschlagen, dass der Stellbolzen einen konusförmigen Klemmkolben aufweist oder mit einem konusförmigen Klemmkolben in Verbindung steht und dass in der Hülse ein Klemmkörper achsparallel zum Ventilspielausgleichselement verschiebbar geführt ist, der einen dem Klemmkolben zugeordneten Konus aufweist und aufweitbar ausgebildet ist. Dabei sei darauf hingewiesen, dass bei dem Ventilspielausgleichselement nach dem Keilklemmprinzip der Stellbolzen auch einen Klemmkörper aufweisen oder mit einem Klemmkörper in Verbindung stehen kann, der einen dem Klemmkolben zugeordneten Konus aufweist und aufweitbar ist und dass der Klemmkolben in der Hülse achsparallel zum Ventilspielausgleichselement verschiebbar geführt sein kann und mit dem Klemmkörper des Stellbolzens in Wirkverbindung steht. Es kommt also entscheidend darauf an, dass das Keilklemmprinzip mit Verschiebemöglichkeit in der Hülse verwirklicht ist, unabhängig davon, wie die Zuordnung und Ausgestaltung des Klemmkolbens und des Klemmkörpers ausgeführt ist.In a further embodiment of the invention it is proposed that the adjusting bolt has a cone-shaped clamping piston or is in communication with a cone-shaped clamping piston and that in the sleeve, a clamping body is guided axially parallel to the valve lash adjuster, which has a clamping piston associated with the cone and is formed expandable. It should be noted that in the valve clearance compensation element according to the wedge clamping principle of the adjusting bolt also have a clamping body or may be in communication with a clamping body having a clamping piston associated cone and is expandable and that the clamping piston in the sleeve axially parallel to the valve lash adjuster be slidably guided can and is in operative connection with the clamping body of the adjusting bolt. It is therefore crucial that the wedge clamping principle is realized with a possibility of displacement in the sleeve, regardless of how the assignment and design of the clamping piston and the clamping body is executed.
In einer anderen Ausführung der Erfindung wird vorgeschlagen, dass der Stellbolzen mittels eines Außengewindes an einem Innengewinde der Hülse abgestützt ist, wobei die durch die Feder belasteten Gewindeflanken am Stellbolzen und der Hülse als Gleitflanken mit steilem Winkel zur Längsachse des Ventilspielausgleichselements und die Gewindegegenflanken als Sperr- oder Klemmflanken mit flachem Winkel zur Längsachse ausgefuhrt sind.In another embodiment of the invention it is proposed that the adjusting bolt is supported by an external thread on an internal thread of the sleeve, wherein the loaded by the spring thread flanks on the adjusting bolt and the sleeve as sliding flanks at a steep angle to the longitudinal axis of the valve lash adjuster and the threaded counter flanks as blocking or clamping flanks are made at a flat angle to the longitudinal axis.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Zur weiteren Erläuterung der Erfindung wird auf die Zeichnungen verwiesen, in denen ein Ausführungsbeispiel der Erfindung vereinfacht dargestellt ist.For further explanation of the invention reference is made to the drawings, in which an embodiment of the invention is shown in simplified form.
Es zeigen:Show it:
Detaillierte Beschreibung der ZeichnungenDetailed description of the drawings
In den
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- Nockenwellecamshaft
- 22
- Nockencam
- 33
- Rollenroll
- 44
- Übertragungselementetransmission elements
- 55
- VentilspielausgleichselementeValve lash adjustment elements
- 66
- GaswechselventileGas exchange valves
- 77
- Federnfeathers
- 88th
- VornockenVornocken
- 99
- KeilklemmeinheitWedge clamping unit
- 1010
- Sonderrampespecial ramp
- 1111
- Beschleunigungsspitzeacceleration peak
- 1212
- GewindeklemmeinheitThreaded clamping unit
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- WO 2009/096353 A1 [0002] WO 2009/096353 A1 [0002]
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011003903A DE102011003903A1 (en) | 2011-02-10 | 2011-02-10 | Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011003903A DE102011003903A1 (en) | 2011-02-10 | 2011-02-10 | Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102011003903A1 true DE102011003903A1 (en) | 2012-08-16 |
Family
ID=46579450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102011003903A Withdrawn DE102011003903A1 (en) | 2011-02-10 | 2011-02-10 | Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102011003903A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009096353A1 (en) | 2008-01-28 | 2009-08-06 | Ntn Corporation | Lash adjuster |
-
2011
- 2011-02-10 DE DE102011003903A patent/DE102011003903A1/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009096353A1 (en) | 2008-01-28 | 2009-08-06 | Ntn Corporation | Lash adjuster |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R081 | Change of applicant/patentee |
Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE Effective date: 20120827 Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, DE Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE Effective date: 20120827 |
|
| R081 | Change of applicant/patentee |
Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, DE Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES AG & CO. KG, 91074 HERZOGENAURACH, DE Effective date: 20140213 Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES AG & CO. KG, 91074 HERZOGENAURACH, DE Effective date: 20140213 |
|
| R081 | Change of applicant/patentee |
Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE Effective date: 20150407 |
|
| R005 | Application deemed withdrawn due to failure to request examination |