DE102014221136B3 - Hubvariabler valve drive of an internal combustion engine - Google Patents
Hubvariabler valve drive of an internal combustion engine Download PDFInfo
- Publication number
- DE102014221136B3 DE102014221136B3 DE102014221136.0A DE102014221136A DE102014221136B3 DE 102014221136 B3 DE102014221136 B3 DE 102014221136B3 DE 102014221136 A DE102014221136 A DE 102014221136A DE 102014221136 B3 DE102014221136 B3 DE 102014221136B3
- Authority
- DE
- Germany
- Prior art keywords
- cam
- slide tracks
- axial
- cylinder
- displacement
- 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 - Fee Related
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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
- F01L1/02—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
-
- 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
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Vorgeschlagen ist ein Ventiltrieb eines Verbrennungsmotors, mit – einer Nockenwelle (1), die eine Trägerwelle (2) und zwei Nockenstücke (3, 4) umfasst, die jeweils eine Gruppe benachbarter Nocken (5, 6) mit unterschiedlichen Nockenerhebungen und endseitig ein Zylindersegment (10', 11', 10'', 11'') aufweisen und die drehfest und zwischen zwei Axialpositionen verschiebbar auf der Trägerwelle angeordnet sind, wobei sich die Zylindersegmente axial überlappen und außenumfänglich eine nutförmige Axialkulisse (7', 7'') zur Vorgabe zweier Kulissenbahnen (12', 13', 12'', 13'') bilden, – und zwei Aktuatorstiften (8, 9), die selektiv in die Kulissenbahnen einspuren und die Nockenstücke sukzessiv in die beiden Axialpositionen verschieben, wobei die Kulissenbahnen jeweils aus einem radialen Nuteinspurbereich (14', 15', 14'', 15'') und einem axialen Verschiebebereich (16', 17', 16'', 17'') mit zwei Verschiebeteilen (16'-3, 16'-4, 17'-4, 17'-3, 16''-3, 16''-4, 17''-4, 17''-3) zusammengesetzt sind, von denen ein Verschiebeteil auf einem Zylindersegment und der andere Verschiebeteil auf dem anderen Zylindersegment verläuft. Jeweils die auf demselben Zylindersegment verlaufenden Verschiebeteile sollen bis zu deren Vereinigung axial konvergieren.A valve drive of an internal combustion engine is proposed, comprising a camshaft (1) which comprises a carrier shaft (2) and two cam pieces (3, 4), each having a group of adjacent cams (5, 6) with different cam elevations and a cylinder segment at the end ( 10 ', 11', 10 '', 11 '') and which are arranged rotationally fixed and displaceable between two axial positions on the support shaft, wherein the cylinder segments overlap axially and externally circumferentially a groove-shaped Axialkulisse (7 ', 7' ') to specification two slide tracks (12 ', 13', 12 '', 13 '') form, - and two actuator pins (8, 9) which selectively engage in the slide tracks and successively move the cam pieces in the two axial positions, wherein the slide tracks each a radial Nuteinspurbereich (14 ', 15', 14 '', 15 '') and an axial displacement portion (16 ', 17', 16 '', 17 '') with two displacement parts (16'-3, 16'-4 , 17'-4, 17'-3, 16 '' - 3, 16 '' - 4, 17 '' - 4, 17 '' - 3) together are supported, of which a sliding part on a cylinder segment and the other displacement part extends on the other cylinder segment. In each case, the sliding parts running on the same cylinder segment should converge axially until their union.
Description
Die Erfindung betrifft einen Ventiltrieb eines Verbrennungsmotors, mit
- – einer Nockenwelle, die eine Trägerwelle und zwei Nockenstücke umfasst, die jeweils eine Nockengruppe benachbarter Nocken mit unterschiedlichen Nockenerhebungen und endseitig ein Zylindersegment aufweisen und die drehfest und zwischen zwei Axialpositionen verschiebbar auf der Trägerwelle angeordnet sind, wobei sich die Zylindersegmente axial überlappen und außenumfänglich eine nufförmige Axialkulisse zur Vorgabe zweier Kulissenbahnen bilden,
- – und zwei Aktuatorstiften, die selektiv in die Kulissenbahnen einspuren und die Nockenstücke sukzessiv in die beiden Axialpositionen verschieben.
- - A camshaft comprising a carrier shaft and two cam pieces, each having a cam group of adjacent cams with different cam lobes and end a cylinder segment and which are rotatably and slidably disposed between two axial positions on the support shaft, wherein the cylinder segments overlap axially and externally circumferentially a nufförmige Axial backdrop for specifying two slide tracks,
- - And two actuator pins that selectively engage in the slide tracks and successively move the cam pieces in the two axial positions.
Die Kulissenbahnen sind jeweils aus einem radialen Nuteinspurbereich und einem axialen Verschiebebereich mit zwei Verschiebeteilen zusammengesetzt, von denen ein Verschiebeteil auf einem Zylindersegment und der andere Verschiebeteil auf dem anderen Zylindersegment verläuft.The slide tracks are each composed of a radial Nuteinspurbereich and an axial displacement region with two sliding parts, of which a sliding part on a cylinder segment and the other displacement part extends on the other cylinder segment.
Ein gattungsgemäßer Ventiltrieb ist aus der
Die
Aufgabe der Erfindung ist es, einen besonders kompakt bauenden Ventiltrieb der eingangs genannten Art anzugeben.The object of the invention is to provide a particularly compact valve drive of the type mentioned.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Demnach sollen jeweils die auf demselben Zylindersegment verlaufenden Verschiebeteile bis zu deren Vereinigung axial konvergieren, wobei jeweils der an den Nuteinspurbereich angrenzende Verschiebeteil an einem bezüglich der Nockendrehrichtung späteren Umfangswinkel beginnt als der sich mit diesem Verschiebeteil vereinigende Verschiebeteil.This object is solved by the features of claim 1. Accordingly, each of the running on the same cylinder segment sliding parts converge axially to their union, each of the adjoining the Nuteinspurbereich sliding part starts at a later with respect to the cam rotation circumferential angle than the sliding part associated with this displacement part.
Mit anderen Worten soll der Axialabstand der Kulissenbahnen so reduziert werden, dass die Enden der axial benachbarten Verschiebeteile ineinander laufen und gleichsam v-förmig oder y-förmig miteinander verschmelzen, so dass der axiale Bauraumbedarf der Axialkulisse reduziert ist. Aufgrund der entsprechend gering beabstandeten Aktuatorstifte kann damit auch der Aktuator relativ kompakt bauen. Durch die axial unsymmetrische Verzerrung der beiden sich vereinigenden Verschiebeteile gelingt es, den Umfangswinkel jedes Nuteinspurbereichs zu vergrößern, so dass die Aktuatorstifte ausreichend Zeit haben, um vollständig in die Axialkulisse einzuspuren. Hierdurch kann entweder bei gleicher Sicherheit gegen Fehlschaltungen die Nockenwellen-Umschaltdrehzahl oder bei gleicher Umschaltdrehzahl die Schaltsicherheit oder beides gemeinsam erhöht werden.In other words, the axial distance of the slide tracks should be reduced so that the ends of the axially adjacent sliding parts run into each other and merge like v-shaped or y-shaped together, so that the axial space requirement of the axial slide is reduced. Due to the correspondingly small spaced actuator pins so that the actuator can build relatively compact. Due to the axially asymmetrical distortion of the two uniting displacement parts, it is possible to increase the circumferential angle of each groove groove area, so that the actuator pins have sufficient time to fully engage in the axial slide. As a result, either the same safety against faulty switching, the camshaft switching speed or at the same switching speed, the switching reliability or both can be increased together.
Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den Zeichnungen, in denen Ausführungsbeispiele eines hubvariablen Ventiltriebs anhand der für das Verständnis der Erfindung relevanten Ausschnitte dargestellt sind. Sofern nicht anders erwähnt, sind dabei gleiche oder funktionsgleiche Merkmale oder Bauteile mit gleichen Bezugszeichen versehen. Es zeigen:Further features of the invention will become apparent from the following description and from the drawings, in which exemplary embodiments of a variable-stroke valve drive are illustrated with reference to the relevant for the understanding of the invention cutouts. Unless otherwise stated, the same or functionally identical features or components are provided with the same reference numerals. Show it:
Die zur betriebspunktabhängigen Aktivierung der jeweiligen Nocken
Die Zylinderhalbschalen
Die Nutbereiche beginnen bezüglich der stets mit dem Pfeil angegebenen Nockendrehrichtung jeweils mit einem Nuteinspurbereich
Das sukzessive Verschieben der beiden Nockenstücke
Wie es erneut deutlicher in
Der Verschiebevorgang endet mit dem Auswerfen des Aktuatorstifts
Umgekehrt erfolgt das sukzessive Verschieben der beiden Nockenstücke
Wie es aus der Zusammenschau der
Die gemäß
Die in den
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014221136.0A DE102014221136B3 (en) | 2014-10-17 | 2014-10-17 | Hubvariabler valve drive of an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014221136.0A DE102014221136B3 (en) | 2014-10-17 | 2014-10-17 | Hubvariabler valve drive of an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
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DE102014221136B3 true DE102014221136B3 (en) | 2016-03-31 |
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DE102014221136.0A Expired - Fee Related DE102014221136B3 (en) | 2014-10-17 | 2014-10-17 | Hubvariabler valve drive of an internal combustion engine |
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DE (1) | DE102014221136B3 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015219876A1 (en) * | 2015-10-14 | 2017-04-20 | Bayerische Motoren Werke Aktiengesellschaft | Auslassventilabschaltung |
DE102017212754B3 (en) | 2017-07-25 | 2018-09-06 | Bayerische Motoren Werke Aktiengesellschaft | Arrangement of sliding grooves |
CN110067612A (en) * | 2019-05-15 | 2019-07-30 | 杰锋汽车动力***股份有限公司 | A kind of three-level variable air valve lift range mechanism for internal combustion engine |
CN113250778A (en) * | 2021-03-31 | 2021-08-13 | 杰锋汽车动力***股份有限公司 | Shaft sleeve structure for variable valve lift system |
DE112017001696B4 (en) | 2016-03-31 | 2024-01-25 | Honda Motor Co., Ltd. | Variable valve train |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007010149A1 (en) * | 2007-03-02 | 2008-09-04 | Audi Ag | Automotive piston engine gas valve timer has right- and left-handed grooves are located immediately alongside and translating into each other |
DE102007037745A1 (en) * | 2007-08-10 | 2009-02-12 | Daimler Ag | combustion engine valve |
-
2014
- 2014-10-17 DE DE102014221136.0A patent/DE102014221136B3/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007010149A1 (en) * | 2007-03-02 | 2008-09-04 | Audi Ag | Automotive piston engine gas valve timer has right- and left-handed grooves are located immediately alongside and translating into each other |
DE102007037745A1 (en) * | 2007-08-10 | 2009-02-12 | Daimler Ag | combustion engine valve |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015219876A1 (en) * | 2015-10-14 | 2017-04-20 | Bayerische Motoren Werke Aktiengesellschaft | Auslassventilabschaltung |
US10513952B2 (en) | 2015-10-14 | 2019-12-24 | Bayerische Motoren Werke Aktiengesellschaft | Exhaust valve deactivation |
DE112017001696B4 (en) | 2016-03-31 | 2024-01-25 | Honda Motor Co., Ltd. | Variable valve train |
DE102017212754B3 (en) | 2017-07-25 | 2018-09-06 | Bayerische Motoren Werke Aktiengesellschaft | Arrangement of sliding grooves |
CN110067612A (en) * | 2019-05-15 | 2019-07-30 | 杰锋汽车动力***股份有限公司 | A kind of three-level variable air valve lift range mechanism for internal combustion engine |
CN110067612B (en) * | 2019-05-15 | 2021-02-02 | 杰锋汽车动力***股份有限公司 | Three-stage variable valve lift mechanism for internal combustion engine |
CN113250778A (en) * | 2021-03-31 | 2021-08-13 | 杰锋汽车动力***股份有限公司 | Shaft sleeve structure for variable valve lift system |
CN113250778B (en) * | 2021-03-31 | 2024-05-03 | 杰锋汽车动力***股份有限公司 | Shaft sleeve structure for variable valve lift system |
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