EP0829620B1 - Verstell-Nockenwelle für eine ventilgesteuerte Hubkolbenmaschine, insbesondere Brennkraftmaschine - Google Patents
Verstell-Nockenwelle für eine ventilgesteuerte Hubkolbenmaschine, insbesondere Brennkraftmaschine Download PDFInfo
- Publication number
- EP0829620B1 EP0829620B1 EP97114533A EP97114533A EP0829620B1 EP 0829620 B1 EP0829620 B1 EP 0829620B1 EP 97114533 A EP97114533 A EP 97114533A EP 97114533 A EP97114533 A EP 97114533A EP 0829620 B1 EP0829620 B1 EP 0829620B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- cams
- bearing
- valves
- axially
- 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 description 16
- 239000000463 material Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims 1
- 238000005461 lubrication Methods 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003892 spreading 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/34413—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using composite camshafts, e.g. with cams being able to move relative to the camshaft
Definitions
- the invention is based on the Japanese Patent publication Jp-Pat.-OS 59-183009.
- This known adjusting camshaft is relative to one another on the camshaft cams with adjustable angles, on the one hand on the end faces on bearing blocks of the machine housing and on the other hand against each other are supported.
- the angular adjustment of the two cams is relative to each other via projections engaging in grooves in the bearing bores of the cams on the Camshaft achieved, which is axially displaceable by means of a device.
- the invention is based, for the generic adjusting camshaft the task to show an improved arrangement by means of which the production-related Deviations without an adverse influence on the axial positioning the cams are between the bearing arrangements or bearing blocks.
- the advantage of this invention is that with a camshaft with between groups of angle adjustable Cams arranged bearing the light Distance of the bearing arrangements can no longer affect the axial play, the Influence of thermal expansion when the reciprocating machine is warm the axial play is minimized. This is not achieved with the variable camshaft according to FR-A-2 644 543.
- each shaft-side guide element as a section a three-dimensional flat or trapezoidal thread is designed, and advantageously simplified arrangement on the camshaft of each thread section is in one piece with a respective bolt.
- each guide element with a Bolt results in connection with one in the center in the longitudinal direction in the camshaft arranged lubricant-carrying channel
- the guide elements fixing bolts penetrate the camshaft transversely are arranged, one emerging at one end of each bolt Distribution channel with a communicating with the longitudinal channel of the camshaft Inlet is connected.
- the advantage of this embodiment according to the invention is a reliable lubrication of the angularly movable bearings on the camshaft Cam, with an over by the relatively close cams the lubricant film that builds up the shaft circumference and the lubrication of the Guiding elements in the grooves.
- the bearing bushes with the front Grooves of the cam-covering flanges are formed.
- Camshaft is further achieved in that between two adjacent bearing bushes arranged two axially spaced cams for first similar valves are, and between these a cam for second similar valves that are common are operated via a fork lever.
- Another advantageous adjustment option furthermore results from the fact that the valves associated with the first identical valves Cams are designed differently and possibly grooves with different Have pitch angles. This arrangement allows between Cams for similar valves an additional spread change, too Phasing called, also different valve opening times as well Different valve strokes to advantageously influence the gas dynamics Internal combustion engine on the intake side.
- An additional adjustment option opens up in a further embodiment of the Invention in that a further adjustment device for changing the relative Rotational position of the camshaft relative to a crankshaft of the internal combustion engine is provided, with this adjusting device in combination with the change in spread the angle-adjustable cams the opening and closing times of the different valves can also be changed.
- the one adjusting device for angular adjustment of the cams relative to each other one camshaft end is provided and that the other adjusting device to change the relative camshaft rotational position at the other end of the camshaft is arranged with the thrust bearing, this shaft end section via straight teeth and the thrust bearing via helical or screw teeth each axially adjustable with a corresponding toothing controlled / regulated sliding sleeve cooperates.
- both adjustment devices each have a worm gear comprise, each worm with one arranged transversely to the camshaft Servomotor in drive connection, and being the worm wheels each by means of a non-rotating axial sliding sleeve, each with a roller bearing on the axially displaceable camshaft or the axially adjustable rotational position sliding sleeve act.
- the adjacent cams 3, 3 'and 4 between end faces 6 of on the camshaft 1 separately provided and divided into recesses 7 bearing blocks 5 axially protruding bearing bushes 8 axially positioned.
- the bearing bushes 8 are made of a material with a material of the cylinder head 2 or the bearing blocks 5 have the same or similar thermal expansion value educated.
- some bearing bushes 8 arranged with a sliding fit in the recesses 7 of the bearing blocks 5 be and one or the other bearing bush 8 in the recess 7 of the respective Bearing block 5 to be kept jammed.
- this is for angular adjustment the cams 3, 3 'and 4 to change the cam spread by means of an adjusting device 9 arranged axially displaceably in the bearing bushes 8, wherein a bearing bush 8 in a final bearing arrangement forms a track bearing 10, on the one hand with a drive flange 11 for a drive wheel 12 of a camshaft rotary drive 13 and, on the other hand, can be moved by means of a profile with the Camshaft 1 is in a rotationally fixed connection.
- each Combustion chamber cap 14 in the cylinder head 2 are on the camshaft 1 between two adjacent bearing bushes 8 on both sides of an exhaust cam 4 intake cams 3, 3 'arranged, the axially with each other, for example, over Teflon Metal discs slidably connected cams 3, 3 'and 4 in their Bores 15 arranged with differently directed pitch angles Have grooves 16, in the separately arranged on the outer circumference of the camshaft 1 Intervene guide elements 17.
- each shaft side Guide element 17 as a section of a three-dimensional flat or trapezoidal thread designed with each thread section as a guide element 17 is in one piece with a respective bolt 18.
- the lubrication system the internal combustion engine or the cylinder head 2 introduced into the longitudinal channel 19 Lubricant via the pin 18 between the camshaft 1 and Bores 15 of the cams 3, 3 'and 4 introduced. Due to the relatively close together Cam 3, 3 'and 4 is installed in their bearing holes 15 closed lubricating film, the lubrication of the guide elements 17 in the grooves 16 takes over. To prevent an inadmissible lubricant drain To avoid the guide grooves 16, the bearing bushes 8 are with the front Grooves 16 of the cams 3, 3 'covering flanges 22 are formed.
- a further adjustment device 24 is provided to expand the adjustment options to change the relative rotational position of the adjusting camshaft 1 compared to one Crankshaft of the internal combustion engine, not shown, is provided.
- the an adjusting device 9 for angular adjustment of the cams 3, 3 'and 4 relative to each other is provided at one camshaft end 25 and that the other Adjustment device 24 for changing the relative camshaft rotational position on the other Camshaft end is arranged with the thrust bearing 10, this shaft end portion 26 via a spur gear 27 and the thrust bearing 10 via a Helical or helical teeth 28 each with a corresponding toothing cooperates on a controllably adjustable sliding sleeve 29.
- both adjustment devices 9 and 24 each comprise a self-locking worm gear 30 or 31, each worm 32 or 33 with a transverse to the variable camshaft 1 arranged servomotor 34 or 35 is in drive connection.
- the worm wheels 36 and 37 each act by means of a non-rotating Axialschiebehülse 38 or 39 via a roller bearing 40 or 41 on the axial slidable camshaft 1 or the axially adjustable rotary position sliding sleeve 29 a.
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)
Description
- Figur 1
- eine Verstell-Nockenwelle in einem abschnittsweise dargestellten Zylinderkopf einer mehrzylindrigen Brennkraftmaschine
- Figur 2
- einen Schnitt durch einen Nocken und die Nockenwelle gemäß der Linie II-II.
Claims (11)
- Verstell-Nockenwelle für eine ventilgesteuerte Hubkolbenmaschine, insbesondere Brennkraftmaschine,bei der auf einer axial verschiebbaren, zylindrischen Nockenwelle (1) Nocken (3, 3', 4) relativ zueinander über gleitbewegliche, formschlüssige Verbindungen (16, 17) winkelverstellbar angeordnet sind, undbenachbarte, axial gegeneinander abgestützte Nocken (3, 3', 4) über maschinenseitige geteilte Lageranordnungen (5) der Nockenwelle (1) auf dieser gegenüber der axial verschiebbaren Nockenwelle (1) axial positioniert gehalten sind,wobei benachbarte Nocken (3, 3', 4) über Stirnseiten (6) von in Ausnehmungen (7) der maschinenseitigen geteilten Lageranordnungen (5) angeordneten, über die Lageranordnungen (5) axial vorstehend ausgebildeten Lagerbuchsen (8) positioniert gehalten sind,daß die die Nockenwelle (1) dreh- und verschiebebeweglich aufnehmenden Lagerbuchsen (8) aus einem Werkstoff mit einem dem Material der maschinenseitigen geteilten Lageranordnungen (5) gleichen oder ähnlichen Wärmedehnungswert gebildet sind.
- Nockenwelle nach Anspruch 1, dadurch gekennzeichnet,daß die Nockenwelle (1) zur Winkelverstellung der Nocken (3, 3', 4) mittels einer Verstellvorrichtung (9) in den Lagerbuchsen (8) axial verschiebbar angeordnet ist, undeine Lagerbuchse (8) in einer End-Lageranordnung ein Spurlager (10) bildet, daseinerseits mit einem Antriebsflansch (11) eines Nockenwellen-Drehantriebes (13) und andererseits über ein Profil schiebebeweglich mit der Nockenwelle (1) in drehfester Verbindung steht.
- Nockenwelle nach Anspruch 1 oder 2, dadurch gekennzeichnet,daß zwischen zwei benachbarten Lagerbuchsen (8) zumindest ein Einlaßnocken (3, 3') und ein Auslaßnocken (4) auf der Nockenwelle (1) winkelverstellbar gelagert angeordnet sind, wobeidie miteinander axial gleitbeweglich in Verbindung stehenden Nocken (3, 3', 4) in ihren Lagerbohrungen (15) mit verschieden gerichteten Steigungswinkeln angeordnete Nuten (16) aufweisen, in dieam Außenumfang der Nockenwelle (1) gesondert angeordnete Führungselemente (17) eingreifen.
- Nockenwelle nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet,daß die Nuten (16) in den Nocken (3, 3', 4) schraubengangartig ausgebildet sind, unddaß jedes wellenseitige Führungselement (17) als Abschnitt eines dreidimensionalen Flach- oder Trapezgewindeganges gestaltet ist, wobeijeder Gewindegang-Abschnitt als Führungselement (17) mit einem jeweiligen Bolzen (18) in einstückiger Verbindung steht.
- Nockenwelle nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet,daß ein schmiermittelführender Kanal (19) mittig in Längsrichtung in der Nockenwelle (1) angeordnet ist, unddaß die Führungselemente (17) fixierende Bolzen (18) die Nockenwelle (1) quer durchsetzend angeordnet sind, wobeiein an einem Ende jedes Bolzens (18) frei austretender Verteilkanal (20) mit einem mit dem Längs-Kanal (19) der Nockenwelle (1) kommunizierenden Zulauf (21) in Verbindung steht.
- Nockenwelle nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die Lagerbuchsen (8) stirnseitig mit die Nuten (16) der Nocken (3, 3', 4) überdeckenden Flanschen (22) ausgebildet sind.
- Nockenwelle nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet,daß zwischen zwei benachbarten Lagerbuchsen (8) für erste gleichartige Ventile (Einlaßventile 23) zwei axial beabstandete Nocken (Einlaßnocken 3, 3') angeordnet sind, undzwischen diesen ein Nocken (4) für zweite gleichartige Ventile (Auslaßventile), diegemeinsam über einen Gabelhebel betätigt sind.
- Nockenwelle nach den Ansprüchen 1 bis 7, dadurch gekennzeichnet,daß die den ersten gleichartigen Ventilen (Einlaßventile 23) zugeordneten Nocken (Einlaßnocken 3, 3') unterschiedlich gestaltet sind undgegebenenfalls Nuten (16) mit unterschiedlichen Steigungswinkeln aufweisen.
- Nockenwelle nach den Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß eine weitere Verstellvorrichtung (24) zur Änderung der relativen Drehlage der Nockenwelle (1) gegenüber einer Kurbelwelle der Brennkraftmaschine vorgesehen ist.
- Nockenwelle nach den Ansprüchen 1 bis 9, dadurch gekennzeichnet,daß die eine Verstellvorrichtung (9) zur Winkelverstellung der Nocken (3, 3', 4) relativ zueinander an einem Wellenende (25) vorgesehen ist, unddaß die andere Verstellvorrichtung (24) zur Änderung der relativen Nockenwellen-Drehlage am anderen Nockenwellenende mit dem Spurlager (10) angeordnet ist, wobeidieser Wellenendabschnitt (26) über eine Geradverzahnung (27) und das Spurlager (10) über eine Schräg- oder Schraubverzahnung (28) jeweils mit einer korrespondierenden Verzahnung an einer gesteuert/geregelt verstellbaren Schiebehülse (29) zusammenwirkt.
- Nockenwelle nach den Ansprüchen 1 bis 10, dadurch gekennzeichnet,daß beide Verstellvorrichtungen (9, 24) jeweils ein selbsthemmendes Schneckengetriebe (30, 31) umfassen, wobeijede Schnecke (32, 33) mit einem quer zur Nockenwelle (1) angeordneten Stellmotor (34, 35) in Antriebsverbindung steht undwobei die Schneckenräder (36, 37) jeweils mittels einer drehgesicherten Axialschiebehülse (38, 39) über jeweils ein Wälzlager (40, 41) auf die axial verschiebbare Nockenwelle (1) oder die axial verstellbare Drehlagen-Schiebehülse (29) einwirken.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19637416 | 1996-09-13 | ||
DE19637416A DE19637416A1 (de) | 1996-09-13 | 1996-09-13 | Verstell-Nockenwelle für eine ventilgesteuerte Hubkolbenmaschine, insbesondere Brennkraftmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0829620A2 EP0829620A2 (de) | 1998-03-18 |
EP0829620A3 EP0829620A3 (de) | 1998-04-08 |
EP0829620B1 true EP0829620B1 (de) | 2000-07-12 |
Family
ID=7805591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97114533A Expired - Lifetime EP0829620B1 (de) | 1996-09-13 | 1997-08-22 | Verstell-Nockenwelle für eine ventilgesteuerte Hubkolbenmaschine, insbesondere Brennkraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0829620B1 (de) |
DE (2) | DE19637416A1 (de) |
ES (1) | ES2148883T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6439180B2 (en) | 2000-01-21 | 2002-08-27 | Dr. Ing. H.C.F. Porsche Ag | Cylinder head for a valve-controlled internal combustion engine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19646934A1 (de) | 1996-11-13 | 1998-05-14 | Bayerische Motoren Werke Ag | Verstell-Nockenwelle, insbesondere für ventilgesteuerte Brennkraftmaschinen |
DE19823316A1 (de) * | 1998-05-26 | 1999-12-02 | Volkswagen Ag | Buchse mit Flansch und Verfahren zu deren Herstellung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59183009A (ja) * | 1983-03-31 | 1984-10-18 | Suzuki Motor Co Ltd | 4サイクルエンジンのバルブタイミング可変装置 |
FR2644543A1 (de) * | 1989-03-17 | 1990-09-21 | Renault | |
DE4226798A1 (de) * | 1992-08-13 | 1994-02-24 | Bayerische Motoren Werke Ag | Hubkolben-Brennkraftmaschine mit zwei Gaswechselventilen je Zylinder |
DE4331977A1 (de) * | 1993-09-21 | 1995-03-23 | Porsche Ag | Variable Ventilsteuerung |
DE4416505A1 (de) * | 1994-05-10 | 1995-11-16 | Bayerische Motoren Werke Ag | Nockenwelle mit verdrehbaren Nocken |
-
1996
- 1996-09-13 DE DE19637416A patent/DE19637416A1/de not_active Withdrawn
-
1997
- 1997-08-22 DE DE59702000T patent/DE59702000D1/de not_active Expired - Lifetime
- 1997-08-22 EP EP97114533A patent/EP0829620B1/de not_active Expired - Lifetime
- 1997-08-22 ES ES97114533T patent/ES2148883T3/es not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6439180B2 (en) | 2000-01-21 | 2002-08-27 | Dr. Ing. H.C.F. Porsche Ag | Cylinder head for a valve-controlled internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP0829620A3 (de) | 1998-04-08 |
EP0829620A2 (de) | 1998-03-18 |
DE59702000D1 (de) | 2000-08-17 |
ES2148883T3 (es) | 2000-10-16 |
DE19637416A1 (de) | 1998-03-19 |
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