EP3350423A1 - Distribution variable pour moteurs à combustion interne - Google Patents

Distribution variable pour moteurs à combustion interne

Info

Publication number
EP3350423A1
EP3350423A1 EP16770875.9A EP16770875A EP3350423A1 EP 3350423 A1 EP3350423 A1 EP 3350423A1 EP 16770875 A EP16770875 A EP 16770875A EP 3350423 A1 EP3350423 A1 EP 3350423A1
Authority
EP
European Patent Office
Prior art keywords
control
camshaft
cam
lateral surface
axis
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
Application number
EP16770875.9A
Other languages
German (de)
English (en)
Other versions
EP3350423B1 (fr
Inventor
Johannes Rieger
Thomas Moser
Benjamin BIERBAUMER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AVL List GmbH
Original Assignee
AVL List GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AVL List GmbH filed Critical AVL List GmbH
Publication of EP3350423A1 publication Critical patent/EP3350423A1/fr
Application granted granted Critical
Publication of EP3350423B1 publication Critical patent/EP3350423B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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

Definitions

  • the invention relates to a variable valve control device for internal combustion engines of Hubkolbenbauart with at least one gas exchange valve which is actuated by means of a rotatably mounted about an axis of rotation camshaft connected via a rotatably connected to the camshaft, at least two different cam tracks cam device, wherein by means of a control device optionally one of the cam tracks activated and at least one other cam track is deactivatable, and wherein the control device has at least one pivotable about a pivot axis control lever and at least one rotatably connected to the camshaft first control body, in the surface at least a first cam groove and at least one second cam groove is formed, optionally in the first control groove, a first control pin of the control lever or in the second control groove, a second control pin of the control lever is einlenkbar.
  • a valve train of an internal combustion engine with a camshaft which has a support shaft and a rotatably mounted thereon and axially displaceable between two positions carrier hub.
  • the carrier hub has a cam body with two axially adjacent cams whose cam tracks have different cam elevations and identical base circle diameters.
  • a cylindrical control body has at least one first and one second helical control groove into which a housing-side mounted control pin of an actuating device can be brought into engagement for the axial adjustment of the carrier hub.
  • the actuating device has a rocker arm, which is arranged with axial alignment radially adjacent to the control body and is pivotally mounted about a tangential axis.
  • the rocker arm has at both ends in each case a control pin and is by an actuating element positively and / or non-positively pivotable in a first position, in which the control pin is engaged with the associated control groove. Furthermore, the rocker arm is pivotable to a second position in which the control pin is out of engagement with the associated control. At the same time engages in this second position arranged at the other end of the rocker arm second locking pin in an associated second control groove.
  • the disadvantage is that a lot of space is taken, so that this arrangement is not suitable for many applications.
  • the camshaft has a carrier shaft with at least one rotationally fixed and axially displaceable cam piece, which is displaceable by a switching element from a first axial end position to a second axial end position and by a control element in this end position durable.
  • the piece has a shift gate on with a groove, in which an actuator submitted and the switching contour of the groove follows.
  • a locking element By a locking element, the cam piece can be held in an end position.
  • the control element is unlocked for axial displacement of the cam piece and locked in the area of the assumed end position.
  • the switching element is coupled to the locking element.
  • this valve train is relatively space consuming and also has many items, which increases the creation effort.
  • the object of the invention is to avoid the disadvantages mentioned and to enable compact variable valve timing with low manufacturing and construction costs.
  • control body has an inner first lateral surface and an outer second lateral surface, wherein the first lateral surface to the camshaft axis has a smaller distance than the second lateral surface and the two lateral surfaces are arranged concentrically to the camshaft axis, and wherein the two facing each other Cladding surfaces define a substantially annular control space, and the first cam groove in the first lateral surface and the second cam groove are formed in the second lateral surface.
  • the first and second control grooves are thus arranged one above the other in the radial direction in the same axial section of the camshaft, wherein the first and second control groove opposite to the control space and facing each other. As a result, space can be saved in the axial direction of the camshaft.
  • the substantially cylindrical control chamber is favorably designed to be open on a first end face preferably facing the cam device, the control lever being arranged projecting through the open end face into the control space.
  • the second lateral surface is arranged on the inside of a sleeve part, which is firmly connected to the camshaft, preferably pressed, wherein particularly preferably the connection between the camshaft and sleeve part facing away from the cam device second end face of the control room.
  • the valve control device requires very little space when the pivot axis of the control lever is arranged parallel to the camshaft axis.
  • the pivot axis of the control lever is arranged inclined to the camshaft axis, wherein in at least one projection normal to the camshaft axis, the pivot axis with the camshaft axis an angle between 0 ° and 60 °, preferably between 0 ° and 30 °.
  • this design can offer design advantages.
  • the control lever has a preferably fork-shaped switching element, which engages on a driver element of the axially displaceably arranged on the camshaft cam device.
  • the driver element is preferably formed by a ring axially spaced from the cam tracks, which is preferably arranged on a control body facing the end of the cam device.
  • the trained as a ring driver element can be easily assembled with the camshaft and allows axial adjustment of the cam device along the camshaft axis regardless of the rotational angle of the camshaft.
  • the cam device can act on rocker arms or bucket tappets on at least one gas exchange valve.
  • control lever has a preferably fork-shaped switching element, which acts on one of the non-displaceably connected to the camshaft cam device actuated transmission element, which transmission element is designed to be displaceable parallel to the camshaft axis.
  • the transmission element is a rotatable and axially displaceable on a valve lever roller body.
  • the cam device may be formed integrally with the camshaft, the cam tracks may be molded directly into the camshaft.
  • cam device or the transmission element can be locked via at least one spring detent element.
  • axial movements within the production-related clearance of the elements of the control device are avoided in the end positions of the cam device or the transmission element, which increase the wear and can also have an acoustically disadvantageous effect.
  • Show: 1 shows a variable valve control device according to the invention in a first embodiment in an oblique view in a longitudinal section in a first displacement position.
  • variable valve control device in a longitudinal section in an oblique view in a longitudinal section in a second displacement position.
  • variable valve control device in a second embodiment in an oblique view in a longitudinal section in a first displacement position.
  • variable valve control device in a longitudinal section in an oblique view in a longitudinal section in a second displacement position
  • FIG. 7 shows this variable valve control device in a longitudinal section in the first displacement position
  • FIGS. 1 to 4 show a first embodiment variant
  • FIGS. 5 to 10 show a second embodiment variant of the invention.
  • variable valve timing device 1 for internal combustion engines has at least one rotatably mounted about a camshaft axis 2 camshaft 3, wherein a cam device 4 with at least two cams 5, 6 and cam tracks 7, 8 rotatably connected to the camshaft 3.
  • the cam device 4 acts in the guiding examples on, for example, designed as a roller body transmission element 30 of a transmission device 31 - for example, a valve lever - a, which transmission device 31 at least one - in Figs. 9 and Fig. 10 drawn - gas exchange valve 32 of the internal combustion engine actuated.
  • one of the cam tracks 7, 8 can be activated or deactivated via a control device 10.
  • the control device 10 has at least one control lever 12, which is pivotable about a pivot axis 11 and axially displaceably mounted along the pivot axis 11 between two end positions, and at least one rotationally fixed connection with the camshaft 3
  • Control body 13 which spans a control chamber 16 between an inner first lateral surface 14 and an outer second lateral surface 15.
  • the pivot axis 11 is arranged in the exemplary embodiments parallel to the camshaft axis 2, but can also - as viewed in a projection normal to the camshaft axis 2 - be executed inclined at an acute angle.
  • the substantially cylindrical lateral surfaces 14, 15 are arranged concentrically to the camshaft axis 2.
  • the radially inwardly directed second lateral surface 15 is further away from the camshaft axis 2 than the radially outwardly directed first lateral surface 14.
  • the substantially cylindrical control chamber 16 is designed to be open on a first end face 16a facing the cam device 4, the control lever 12 being arranged projecting into the control space 16 through the open end face 16a.
  • the second lateral surface 15 is arranged in the exemplary embodiments on the inside of a sleeve part 9, which is firmly connected to the camshaft 3, for example, pressed, wherein the connection between the camshaft 3 and sleeve part 9 on one of the cam device 4 remote from the second end face 16b of the control chamber sixteenth he follows.
  • the control grooves 17, 18 are rotated in different directions - ie the one control groove clockwise, the other control groove counterclockwise - in the lateral surfaces 14, 15 formed.
  • the control lever 12 has a first control pin 19 and a second control pin 20, wherein the two control pins 19, 20 are arranged on the same first lever arm 21 of the control lever 12.
  • the first and second tax Pins 19, 20 are substantially radially with respect to the camshaft axis 2, but differently oriented firmly attached to the first lever arm 21, for example in one piece with this executed.
  • the first control pin 19 is the first lateral surface 14, the second control pin 20 of the second lateral surface 15 faces.
  • the first lever arm 21 of the control lever 12 is guided in the interior of the open-ended first end face 16a of the substantially cylindrical control chamber 16.
  • the control lever 12 can be pivoted via a second lever arm 22 engaging, not shown actuator between a first position and a second position, wherein in the first position the first cam 7 and in the second position, the second cam 8 is activated.
  • the first control pin 19 or the second control pin 20 by switching (black and white circuit) of the control lever 12 in the opposite cam 17, 18 is pressed.
  • the control lever 12 upon rotation of the camshaft 3 and thus also of the control body 13, the control lever 12 is displaced axially in the direction of a second direction opposite the first direction and thereby causes an axial adjustment of the cam device 4 (FIGS. 1 to 4) via a fork-shaped shifting element 23 of the control lever 12 4) or an axial adjustment of a transmission element 30 (FIG. 5 to 10) contacting with the cam device 4 in this second direction.
  • the control lever 12 acts via a fork-shaped switching element 23 or 25 on a driver element 24 or 26 of the cam device 4 (FIG. 1 to FIG. 4) or of the transmission element 30 (FIG. 5 to FIG. 10).
  • the timing of the switching of the control lever 12 is independent of the rotation angle of the camshaft 3, since the control grooves 17, 18 are designed so that the adjustment operations only in the base circles of the cam tracks 7, 8 done.
  • the cam device 4 is arranged in a rotationally fixed, axially displaceable manner on the camshaft 3.
  • the cam device 4 has a driver element 24 on the side facing the control body 13. Due to the rotational movement of the camshaft 3 with the control grooves 17, 18, the control pins 19, 20 and thus the control lever 12 with the switching element 23 and thus the cam device 4 via the engaging with the switching element 23 driver element 24 is axially displaced.
  • the driver element 24 is formed as a ring 24a, which is formed axially spaced from the cams 5, 6 in the cam device 4.
  • the spring detent element 27 is arranged displaceably in a radial bore of the camshaft 3 and has a latching body 27b loaded by a spring 27a to the outside.
  • a first annular groove 29a and one axially spaced second annular groove 29b are arranged in an inner circumferential surface, wherein in the first end position of the cam device 4 shown in Figs. 1 and Fig. 3, the locking body 27b in the first annular groove 29a and in the second end position of the cam device 4 shown in FIGS. 2 and 4, the detent body 27b engages in the second annular groove 29b and thus axially locks the cam device 4 in the respective end position.
  • the cam device 4 acts via a transmission device 31 on the gas exchange valves, not shown.
  • the transmission device 31 may be formed in a conventional manner as tilting or drag lever with or without roller body, or as a bucket tappet.
  • the rotatable roller body can be designed to be axially immovable.
  • the cam device 4 is fixedly connected to the camshaft 3, for example formed integrally therewith.
  • transmission means 31 has a transmission element 30, for example, a rotatably mounted on the transmission means 31 about an axis 30a roller body on which between a first position and a second position is arranged axially displaceable.
  • a fork-shaped switching element 25 acts on a driver element 26 of the transmission element 30.
  • the spring detent element 28 is arranged radially displaceably in the transmission device 31 designed as a valve lever, namely in a radial bore relative to the valve lever axis 31a, and has a detent body 28b loaded radially inwardly by a spring 28a.
  • the control lever 12 has in its the spring detent element 28 facing surface a first groove 12a and one of them in the direction of the valve lever axis spaced second groove 12, wherein in the first end position of the transmission element 30 shown in Fig. 9, the locking body 28b in the first groove 12a and in the second end position of the transmission element 30 of the locking body 28b engages in the second groove 12b and thus axially locks the transmission element 30 in the respective end position.
  • the control lever 12 is rotatably mounted about the valve lever axis 31a, thus the pivot axis 11 coincides with the valve lever axis 31a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

La présente invention concerne une distribution variable (1) destinée à des moteurs à combustion interne du type à piston alternatif comprenant au moins une soupape d'échange des gaz (32) qui peut être actionnée au moyen d'un arbre à cames (3) monté pour pouvoir tourner sur un axe d'arbre à cames (2), par l'intermédiaire d'un dispositif de came (4) qui est relié de manière solidaire en rotation avec l'arbre à cames (3) et présente au moins deux trajectoires de came (7, 8) différentes, un dispositif de distribution (10) pouvant de manière sélective activer l'une des trajectoires de came (7, 8) et désactiver au moins une autre trajectoire de came (8, 7), et le dispositif de distribution (10) présentant au moins un levier de distribution (12) qui peut pivoter autour d'un axe de pivotement (11) et au moins un premier corps de distribution (13) qui est relié de manière solidaire en rotation à l'arbre à cames (3), au moins une première gorge de distribution (17) et au moins une deuxième gorge de distribution (18) étant formées dans la surface dudit corps de distribution. De manière sélective, un premier tourillon de distribution (19) du levier de distribution (12) peut être guidé dans la première gorge de distribution (17) ou un deuxième tourillon de distribution (20) du levier de distribution (12) peut être guidé dans la deuxième gorge de distribution (18). Pour permettre d'obtenir une distribution variable compacte dont la complexité de réalisation et de fabrication est faible, le corps de distribution (13) présente une première surface latérale (14) intérieure et une deuxième surface latérale (15) extérieure, la première surface latérale (14) étant séparée de l'axe d'arbre à cames (2) par une distance plus faible que la deuxième surface latérale (15), et les deux surfaces latérales (14, 15) étant disposées de manière concentrique à l'axe d'arbre à cames (2), et les deux surfaces latérales (14, 15) orientées l'une vers l'autre délimitant un espace de distribution (16) sensiblement annulaire, et la première gorge de distribution (17) est formée dans la première surface latérale (14) et la deuxième gorge de distribution (18) est formée dans la deuxième surface latérale (15).
EP16770875.9A 2015-09-18 2016-09-19 Dispositif de commande variable de soupape de moteur à combustion interne Not-in-force EP3350423B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50802/2015A AT517815B1 (de) 2015-09-18 2015-09-18 Variable ventilsteuerungseinrichtung für brennkraftmaschinen
PCT/AT2016/060065 WO2017045008A1 (fr) 2015-09-18 2016-09-19 Distribution variable pour moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP3350423A1 true EP3350423A1 (fr) 2018-07-25
EP3350423B1 EP3350423B1 (fr) 2019-03-13

Family

ID=57003287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16770875.9A Not-in-force EP3350423B1 (fr) 2015-09-18 2016-09-19 Dispositif de commande variable de soupape de moteur à combustion interne

Country Status (5)

Country Link
US (1) US10385738B2 (fr)
EP (1) EP3350423B1 (fr)
CN (1) CN108291460B (fr)
AT (1) AT517815B1 (fr)
WO (1) WO2017045008A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007010157A1 (de) * 2007-03-02 2008-06-26 Audi Ag Ventiltrieb einer Brennkraftmaschine mit dreistufigen Nockenprofilgruppen und axial beweglichen Kulissen- oder Eingriffselementen
DE102007010156A1 (de) * 2007-03-02 2008-09-04 Audi Ag Ventiltrieb einer Brennkraftmaschine mit mehrstufigen Nockenprofilgruppen und Stellorganen mit mindestens zwei Eingriffselementen
DE102007048915A1 (de) * 2007-10-12 2009-04-16 Daimler Ag Ventiltriebvorrichtungen
DE102008060169B4 (de) * 2008-11-27 2023-02-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Ventiltrieb für Gaswechselventile einer Brennkraftmaschine
DE102011002142B4 (de) * 2011-04-18 2022-07-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kulissenschaltung für eine Nockenwelle
DE102011076726A1 (de) 2011-05-30 2012-12-06 Schaeffler Technologies AG & Co. KG Ventiltrieb eines Verbrennungskolbenmotors
DE102011117244B4 (de) 2011-10-27 2023-08-10 Mercedes-Benz Group AG Ventiltrieb für eine Brennkraftmaschine
DE102011085705A1 (de) 2011-11-03 2013-05-08 Schaeffler Technologies AG & Co. KG Ventiltrieb einer Brennkraftmaschine
JP6059080B2 (ja) * 2013-05-16 2017-01-11 株式会社オティックス 内燃機関の可変動弁機構
JP2015068189A (ja) * 2013-09-27 2015-04-13 スズキ株式会社 内燃機関の可変動弁装置
KR101483708B1 (ko) * 2013-12-18 2015-01-16 현대자동차 주식회사 연속 가변 밸브 듀레이션 장치
CN103758604B (zh) * 2014-01-23 2017-02-01 长城汽车股份有限公司 用于发动机的配气机构及具有其的车辆

Also Published As

Publication number Publication date
CN108291460B (zh) 2020-06-05
WO2017045008A1 (fr) 2017-03-23
EP3350423B1 (fr) 2019-03-13
US20180266280A1 (en) 2018-09-20
AT517815A1 (de) 2017-04-15
US10385738B2 (en) 2019-08-20
CN108291460A (zh) 2018-07-17
AT517815B1 (de) 2019-10-15

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