DE102004021375B4 - Valve gear of an internal combustion engine with at least one camshaft - Google Patents
Valve gear of an internal combustion engine with at least one camshaft Download PDFInfo
- Publication number
- DE102004021375B4 DE102004021375B4 DE200410021375 DE102004021375A DE102004021375B4 DE 102004021375 B4 DE102004021375 B4 DE 102004021375B4 DE 200410021375 DE200410021375 DE 200410021375 DE 102004021375 A DE102004021375 A DE 102004021375A DE 102004021375 B4 DE102004021375 B4 DE 102004021375B4
- Authority
- DE
- Germany
- Prior art keywords
- camshaft
- bearing block
- cam carrier
- cam
- cylinder head
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 25
- 239000000314 lubricant Substances 0.000 claims abstract description 16
- 230000007704 transition Effects 0.000 claims description 8
- 230000013011 mating Effects 0.000 claims description 4
- 239000000969 carrier Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
-
- 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
- F01L1/047—Camshafts
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Ventiltrieb einer Brennkraftmaschine mit mindestens einer Nockenwelle (1), auf der mindestens ein Nockenträger (2) drehfest und axial verschiebbar angeordnet ist, wobei die mindestens eine Nockenwelle (1) durch einen mindestens einen der Nockenträger (2) umfassenden Lagerblock (3) gelagert ist, wobei auf beiden Seiten des Lagerblocks (3) eine ein Axiallager bildende Anschlagsfläche (3.2) ausgebildet ist, dadurch gekennzeichnet, dass die Brennkraftmaschine einen Zylinderkopf (8) und einen Leiterrahmen (9) aufweist, wobei eine untere Hälfte des Lagerblocks (3) von dem Zylinderkopf (8) und eine obere Hälfte des Lagerblocks (3) von dem Leiterrahmen (9) gebildet wird, und dass in den zwei Anschlagsflächen (3.2) des Lagerblocks (3) jeweils zwei Schmiermitteltaschen (7) ausgebildet sind, die in der oberen Hälfte des Lagerblocks (3) vorliegen, und die gegenüber einer Senkrechten zur Zylinderkopfebene, welche die Nockenwelle (1) radial mittig schneidet, einen Winkel von etwa ±30 Grad bis ±60 Grad aufweisen.Valve gear of an internal combustion engine having at least one camshaft (1) on which at least one cam carrier (2) is arranged rotationally fixed and axially displaceable, wherein the at least one camshaft (1) by a at least one of the cam carrier (2) comprehensive bearing block (3) is mounted , wherein on both sides of the bearing block (3) forming a thrust bearing abutment surface (3.2) is formed, characterized in that the internal combustion engine comprises a cylinder head (8) and a lead frame (9), wherein a lower half of the bearing block (3) of the cylinder head (8) and an upper half of the bearing block (3) of the lead frame (9) is formed, and that in the two abutment surfaces (3.2) of the bearing block (3) in each case two lubricant pockets (7) are formed, in the upper Half of the bearing block (3) are present, and with respect to a perpendicular to the cylinder head plane, which intersects the camshaft (1) radially centered, an angle of about ± 30 degrees b is ± 60 degrees.
Description
Die Erfindung betrifft den Ventiltrieb einer Brennkraftmaschine mit mindestens einer Nockenwelle gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to the valve train of an internal combustion engine having at least one camshaft according to the preamble of claim 1.
Zur Verbesserung der thermodynamischen Eigenschaften von Brennkraftmaschinen sind mechanische Vorrichtungen bekannt, die das Arbeitsspiel des Ventiltriebes beeinflussen und beispielsweise eine drehzahlabhängige Veränderung der Öffnungszeiten oder des Hubes der Gaswechselventile ermöglichen.To improve the thermodynamic properties of internal combustion engines mechanical devices are known which influence the working cycle of the valve train and, for example, allow a speed-dependent change in the opening times or the stroke of the gas exchange valves.
Aus der Druckschrift
Aus der Druckschrift
Weiterhin aus der Druckschrift
Weiterhin sind in Decker, Karl-Heinz; „Maschinenelemente: Gestaltung und Berechnung”; 8. Auflage; Carl Hanser Verlag, München, Wien; 1982; Seite 288 (ISBN 3-446-13558-8) eine Schmierstoffzufuhr sowie Schmiersysteme beschrieben.Furthermore, Decker, Karl-Heinz; "Machine Elements: Design and Calculation"; 8th edition; Carl Hanser Verlag, Munich, Vienna; 1982; Page 288 (ISBN 3-446-13558-8) a lubricant supply and lubrication systems described.
Schließlich beschreibt die Druckschrift
Der Erfindung liegt die Aufgabe zugrunde, den Ventiltrieb einer Brennkraftmaschine gemäß dem Oberbegriff des Patentanspruches 1 anzugeben, bei dem die Lagerung der Nockenwelle und des Nockenträgers verbessert ausgebildet ist, wobei insbesondere Verschleißerscheinungen beim Betrieb des Ventiltriebes vermieden werden.The invention has for its object to provide the valve train of an internal combustion engine according to the preamble of claim 1, wherein the bearing of the camshaft and the cam carrier is formed improved, in particular wear and tear during operation of the valve train can be avoided.
Diese Aufgabe wird erfindungsgemäß durch einen Ventiltrieb mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a valve train with the features of claim 1.
Die Brennkraftmaschine ist mit einem einen Leiterrahmen tragenden Zylinderkopf ausgebildet. Dadurch wird eine Hälfte des Lagerblocks von dem Zylinderkopf gebildet, während die andere Hälfte des Lagerblocks von dem Leiterrahmen gebildet wird.The internal combustion engine is formed with a cylinder head carrying a ladder frame. As a result, one half of the bearing block is formed by the cylinder head, while the other half of the bearing block is formed by the lead frame.
Es ist vorgesehen, dass in den zwei Anschlagsflächen des Lagerblocks jeweils zwei Schmiermitteltaschen ausgebildet werden. Diese zwei Schmiermitteltaschen einer Anschlagsfläche werden in der höher gelegenen Hälfte des Lagerblocks angeordnet. Dabei weisen die zwei Schmiermitteltaschen gegenüber einer Senkrechten zur Zylinderkopfebene, welche die Nockenwelle radial mittig schneidet, einen Winkel von etwa ±30 Grad bis etwa ±60 Grad auf. Beispielsweise weist die erste Schmiermitteltasche einen Winkel von –45 Grad, die zweite einen Winkel von +45 Grad auf. Dadurch kann die Brennkraftmaschine auch geneigt verbaut werden, wodurch das Schmiermittel immer aus einer der Schmiermitteltaschen nicht ablaufen kann.It is envisaged that in each case two lubricant pockets are formed in the two abutment surfaces of the bearing block. These two lubricant pockets of a stop surface are placed in the higher half of the bearing block. In this case, the two lubricant pockets at an angle to the cylinder head plane, which intersects the camshaft radially centered, an angle of about ± 30 degrees to about ± 60 degrees. For example, the first one Lubricant pocket an angle of -45 degrees, the second an angle of +45 degrees. As a result, the internal combustion engine can also be mounted inclined, whereby the lubricant can not always drain from one of the lubricant pockets.
In einer vorteilhaften Weiterbildung der Erfindung ist vorgesehen, dass auf dem mindestens einen Nockenträger mindestens zwei Nocken angeordnet sind, wobei der den Nockenträger umfassende Lagerblock vorteilhaft zwischen den zwei Nocken angeordnet ist. Dabei bilden die inneren Seitenflächen der zwei Nocken die Gegenflächen für die zwei Anschlagsflächen des Lagerblocks.In an advantageous development of the invention it is provided that at least two cams are arranged on the at least one cam carrier, wherein the bearing block comprising the cam carrier is advantageously arranged between the two cams. The inner side surfaces of the two cams form the mating surfaces for the two abutment surfaces of the bearing block.
Während ein Nockenträger vorzugsweise aus einer Stahllegierung gefertigt wird, wird der Lagerblock aus einem Gussmaterial, beispielsweise Aluminiumguss, gefertigt. Dadurch ist es notwendig, dass die zwei das weichere Material aufweisenden Anschlagsflächen des Lagerblocks einen kleineren Durchmesser aufweisen als die das härtere Material aufweisenden inneren Seitenflächen der zwei Nocken des Nockenträgers. Somit wird ein Einschleifen des härteren Materials in das weichere Material mit der Folge einer Kontaktflächenzunahme vermieden, durch welche es zu einem verstärkten Reiben und sogar zu einem Kleben des Nockenträgers an dem Lagerblock kommen könnte.While a cam carrier is preferably made of a steel alloy, the bearing block is made of a cast material, such as cast aluminum. As a result, it is necessary that the two softer material having abutment surfaces of the bearing block have a smaller diameter than the harder material having inner side surfaces of the two cams of the cam carrier. Thus, a grinding of the harder material into the softer material is avoided with the result of a contact surface increase, which could lead to increased rubbing and even sticking of the cam carrier to the bearing block.
Dabei sind die zwei Anschlagsflächen des Lagerblocks an dem Übergang zwischen dem Zylinderkopf und dem Leiterrahmen axial abgeflacht, wodurch das Entstehen eines Vorsprungs zwischen dem Zylinderkopf und dem Leiterrahmen in der Anschlagsfläche vermieden wird, an dem die inneren Seitenflächen der Nocken des Nockenträgers reiben könnten.In this case, the two abutment surfaces of the bearing block are axially flattened at the transition between the cylinder head and the lead frame, whereby the emergence of a projection between the cylinder head and the lead frame is avoided in the abutment surface on which the inner side surfaces of the cam of the cam carrier could rub.
Entsprechend der Drehrichtung der Nockenwelle braucht nur die Seite der Anschlagsflächenhälfte des Lagerblocks am Übergang zwischen dem Zylinderkopf und dem Leiterrahmen axial abgeflacht werden, auf die sich die Nockenwelle beim Betrieb der Brennkraftmaschine zudreht.According to the direction of rotation of the camshaft, only the side of the abutment surface half of the bearing block at the transition between the cylinder head and the lead frame needs to be axially flattened, to which the camshaft rotates during operation of the internal combustion engine.
Für die mindestens zwei Nocken des Nockenträgers ist vorgesehen, dass jeder Nocken mindestens zwei unterschiedliche Nockenlaufbahnen aufweist, wodurch ein Gaswechselventil durch das axiale Verschieben des Nockenträgers unterschiedlich betätigt wird.For the at least two cams of the cam carrier is provided that each cam has at least two different cam tracks, whereby a gas exchange valve is actuated differently by the axial displacement of the cam carrier.
Durch den erfindungsgemäßen Ventiltrieb einer Brennkraftmaschine, bei dem der Lagerblock die Funktion eines Radiallagers und eines Axiallagers übernimmt, ist eine zuverlässige Schmiermittelversorgung gewährleistet, wodurch Verschleißerscheinungen durch das axiale Verschieben der Nockenträger beim Betrieb der Ventiltriebs vermieden werden.By the valve gear of an internal combustion engine according to the invention, in which the bearing block assumes the function of a radial bearing and a thrust bearing, a reliable lubricant supply is ensured, whereby wear is avoided by the axial displacement of the cam carrier during operation of the valve train.
Im Folgenden ist ein erfindungsgemäßer Ventiltrieb einer Brennkraftmaschine anhand von einem Ausführungsbeispiel im Zusammenhang mit zwei Figuren dargestellt und erläutert.In the following, an inventive valve train of an internal combustion engine is illustrated and explained with reference to an embodiment in connection with two figures.
Es zeigen:Show it:
Eine vierzylindrige Brennkraftmaschine mit zwei obenliegenden Nockenwellen zum Antrieb eines Kraftfahrzeuges ist mit einer Vorrichtung zum Verstellen des Hubes und der Öffnungszeiten der einlassseitigen Gaswechselventile ausgestattet. Die Vorrichtung besteht aus vier Nockenträgern, die auf der die einlassseitigen Gaswechselventile betätigenden Nockenwelle drehfest und axial verschiebbar angeordnet sind. Dabei ist jeder Nockenträger genau einem Zylinder zugeordnet, wobei jeder Zylinder der Brennkraftmaschine einlassseitig zwei Gaswechselventile aufweist. Entsprechend sind auf jedem Nockenträger zwei Nocken ausgebildet, wobei jeder Nocken ein einlassseitiges Gaswechselventil betätigt. Jeder der zwei Nocken weist jeweils zwei sich unterscheidende Nockenlaufbahnen auf, die aus einem gemeinsamen Grundkreis axial versetzt aus dem Nocken hervorgehen.A four-cylinder internal combustion engine with two overhead camshafts for driving a motor vehicle is equipped with a device for adjusting the stroke and the opening times of the inlet-side gas exchange valves. The device consists of four cam carriers, which are rotatably and axially displaceably arranged on the inlet side gas exchange valves actuated camshaft. Each cam carrier is associated with exactly one cylinder, with each cylinder of the internal combustion engine having two gas exchange valves on the inlet side. Accordingly, two cams are formed on each cam carrier, each cam actuates an inlet-side gas exchange valve. Each of the two cams has in each case two differing cam tracks, which emerge axially offset from the cam from a common base circle.
Die die Drehfestigkeit bei gleichzeitiger axialer Verschiebbarkeit ermöglichende Verbindung zwischen der Nockenwelle und dem Nockenträger besteht in einer Verzahnung, die auf der Nockenwelle als Außenverzahnung und in dem Nockenträger als Innenverzahnung ausgebildet ist.The rotational strength with simultaneous axial displacement enabling connection between the camshaft and the cam carrier is in a toothing, which is formed on the camshaft as external toothing and in the cam carrier as internal toothing.
Zum axialen Verschieben ist an beiden Seiten der Nockenträger jeweils ein Schneckentrieb ausgebildet, in dem als Vertiefung eine Kurvenbahn ausgebildet ist. Die Kurvenbahnen der zwei Schneckentriebe eines Nockenträgers sind dabei zueinander spiegelbildlich ausgebildet, wodurch das axiale Verschieben des Nockenträgers in beide Richtungen möglich ist.For axial displacement of a respective worm gear is formed on both sides of the cam carrier, in which a curved path is formed as a recess. The curved paths of the two worm gears of a cam carrier are mirror images of each other, whereby the axial displacement of the cam carrier in both directions is possible.
Das axiale Verschieben der Nockenträger erfolgt durch radial zur Nockenwelle angeordnete Stellglieder, die jeweils aus einem Betätigungsstift und aus zwei Elektromagneten bestehen. Die Stellglieder sind fest mit dem Zylinderkopf der Brennkraftmaschine verbunden. Durch die Elektromagneten kann der Betätigungsstift ausgefahren und zurückgezogen werden. Im ausgefahrenen Zustand greift der Betätigungsstift in die die Kurvenbahn bildende Vertiefung eines Schneckentriebes, wobei der Nockenträger durch die Drehung der Nockenwelle beim Betrieb der Brennkraftmaschine axial verschoben wird.The axial displacement of the cam carrier is effected by radially arranged to the camshaft actuators, each consisting of an actuating pin and two electromagnets. The actuators are firmly connected to the cylinder head of the internal combustion engine. By the electromagnet, the actuating pin can be extended and retracted. In the extended state, the actuating pin engages in the recess forming the cam track of a worm drive, wherein the cam carrier is axially displaced by the rotation of the camshaft during operation of the internal combustion engine.
Die jeweils zwei Nockenlaufbahnen der zwei Nocken eines Nockenträgers sind in der Form unterschiedlich ausgebildet, so dass eine Nockenlaufbahn eine kleine Hubhöhe des Gaswechselventils und die andere Nockenlaufbahn eine große Hubhöhe des Gaswechselventils bewirkt. Die Nockenlaufbahn mit der kleinen Hubhöhe wird bei Motordrehzahlen unterhalb 2500 Umdrehungen pro Minute geschaltet, die Nockenlaufbahn mit der großen Hubhöhe wird bei Motordrehzahlen oberhalb 2500 Umdrehungen pro Minute geschaltet.Each two cam tracks of the two cams of a cam carrier are formed differently in shape, so that a cam track causes a small lift of the gas exchange valve and the other cam track causes a large lift of the gas exchange valve. The low lift cam track is switched at engine speeds below 2500 rpm, and the high lift cam track is switched at engine speeds above 2500 rpm.
Die
Der Lagerblock
Der Nockenträger
Bei der Brennkraftmaschine bestehen die Lagerblöcke
Dabei sind die zwei Anschlagsflächen
Entsprechend der Drehrichtung der Nockenwelle
Durch den erfindungsgemäßen Ventiltrieb der Brennkraftmaschine mit den als Axiallager ausgebildeten Anschlagsflächen ist ein verschleißarmer Betrieb der Brennkraftmaschine gegeben.By the valve gear of the internal combustion engine according to the invention with the stop surfaces designed as thrust bearings, a low-wear operation of the internal combustion engine is given.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE200410021375 DE102004021375B4 (en) | 2004-04-30 | 2004-04-30 | Valve gear of an internal combustion engine with at least one camshaft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410021375 DE102004021375B4 (en) | 2004-04-30 | 2004-04-30 | Valve gear of an internal combustion engine with at least one camshaft |
Publications (2)
Publication Number | Publication Date |
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DE102004021375A1 DE102004021375A1 (en) | 2006-01-26 |
DE102004021375B4 true DE102004021375B4 (en) | 2015-05-13 |
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DE200410021375 Expired - Lifetime DE102004021375B4 (en) | 2004-04-30 | 2004-04-30 | Valve gear of an internal combustion engine with at least one camshaft |
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Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007010156A1 (en) | 2007-03-02 | 2008-09-04 | Audi Ag | Valve drive unit for a combustion engine comprises an adjusting unit having interacting elements which interact alternately with a curved connecting part |
DE102007010155A1 (en) | 2007-03-02 | 2008-09-04 | Audi Ag | Camshaft for IC engine has two cam followers plus a circular cam which slides axially into the cam bearing for the non operating valve setting |
DE102007042932B4 (en) | 2007-09-08 | 2022-11-10 | Mercedes-Benz Group AG | Internal combustion engine valve train switching device |
DE102007052249B4 (en) | 2007-11-02 | 2023-12-14 | Mercedes-Benz Group AG | Internal combustion engine valve train switching device |
DE102008024877A1 (en) | 2008-05-23 | 2009-11-26 | Audi Ag | Composite cam shaft for controlling gas shuttle valves of internal-combustion engine, has shaft and multiple torque proof cam elements mounted on shaft |
DE102010022709A1 (en) * | 2010-06-04 | 2011-12-08 | Audi Ag | Valve train for internal combustion engine, has cam carriers and/or cam shaft supported in bearing, and end stop provided for limiting axial shifting of carriers, where end stop is formed as damping element and/or comprises damping element |
DE102011011456A1 (en) | 2011-02-17 | 2012-08-23 | Daimler Ag | Internal combustion engine valve train device |
DE102011011457A1 (en) | 2011-02-17 | 2012-08-23 | Daimler Ag | Internal combustion engine valve train device |
DE102011076726A1 (en) | 2011-05-30 | 2012-12-06 | Schaeffler Technologies AG & Co. KG | Valve train for combustion piston engine, has actuating device with rocker arm, which is arranged adjacent to control body in radial manner with axial alignment, where rocker arm is pivoted around tangential axis |
DE102012002893A1 (en) | 2012-02-14 | 2013-08-14 | Daimler Ag | Kraftfahrzeugventiltriebverstellvorrichtung |
US9217340B2 (en) * | 2014-02-14 | 2015-12-22 | GM Global Technology Operations LLC | Bi-directional control groove design for engine rotation reversal on engine with sliding camshaft |
DE102014014659B3 (en) | 2014-10-08 | 2016-01-14 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Cylinder head of an internal combustion engine with at least one camshaft |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4230877A1 (en) * | 1991-09-30 | 1993-04-01 | Volkswagen Ag | Control for lift valve with two cams - comprises cam block containing two cams which is axially displaceable but non rotatable peripherally on camshaft |
DE10148243A1 (en) * | 2001-09-28 | 2003-04-10 | Ina Schaeffler Kg | Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement |
DE10148179A1 (en) * | 2001-09-28 | 2003-04-17 | Ina Schaeffler Kg | Valve drive with valve stroke reversal for gas exchange valves of 4-stroke IC engines has toothed shaft in center between gas exchange valves, and single undivided cam part |
DE10148177A1 (en) * | 2001-09-28 | 2003-04-17 | Ina Schaeffler Kg | Valve drive with valve stroke reversal for gas exchange valves of 4-stroke IC engines has slide grooves extending across each other due to location at small relative distance, to reduce axial space requirement |
DE102004011586A1 (en) * | 2003-03-21 | 2004-10-07 | Audi Ag | Valve gear for internal combustion engine has facility whereby in first and second axial positions of cam carrier first and second stop faces fixed on cam carrier bear against respective first and second stop faces fixed on cylinder head |
-
2004
- 2004-04-30 DE DE200410021375 patent/DE102004021375B4/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4230877A1 (en) * | 1991-09-30 | 1993-04-01 | Volkswagen Ag | Control for lift valve with two cams - comprises cam block containing two cams which is axially displaceable but non rotatable peripherally on camshaft |
DE10148243A1 (en) * | 2001-09-28 | 2003-04-10 | Ina Schaeffler Kg | Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement |
DE10148179A1 (en) * | 2001-09-28 | 2003-04-17 | Ina Schaeffler Kg | Valve drive with valve stroke reversal for gas exchange valves of 4-stroke IC engines has toothed shaft in center between gas exchange valves, and single undivided cam part |
DE10148177A1 (en) * | 2001-09-28 | 2003-04-17 | Ina Schaeffler Kg | Valve drive with valve stroke reversal for gas exchange valves of 4-stroke IC engines has slide grooves extending across each other due to location at small relative distance, to reduce axial space requirement |
DE102004011586A1 (en) * | 2003-03-21 | 2004-10-07 | Audi Ag | Valve gear for internal combustion engine has facility whereby in first and second axial positions of cam carrier first and second stop faces fixed on cam carrier bear against respective first and second stop faces fixed on cylinder head |
Non-Patent Citations (2)
Title |
---|
DECKER, Karl-Heinz: Maschinenelemente, 8.Aufl., Carl Hanser-Verlag, München, Wien, 1982, S. 288. ISBN 3-446-13558-8 * |
DECKER, Karl-Heinz: Maschinenelemente. 8. Auflage. München, Wien : Carl Hanser-Verlag, 1982. S. 284 - 330. - ISBN 3-446-13558-8 * |
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