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WO2016034336A1 - Arbre à cames pourvu d'une coulisse de commutation - Google Patents

Arbre à cames pourvu d'une coulisse de commutation Download PDF

Info

Publication number
WO2016034336A1
WO2016034336A1 PCT/EP2015/067189 EP2015067189W WO2016034336A1 WO 2016034336 A1 WO2016034336 A1 WO 2016034336A1 EP 2015067189 W EP2015067189 W EP 2015067189W WO 2016034336 A1 WO2016034336 A1 WO 2016034336A1
Authority
WO
WIPO (PCT)
Prior art keywords
track
cam
link
section
drive device
Prior art date
Application number
PCT/EP2015/067189
Other languages
German (de)
English (en)
Inventor
Alexander Busch
Murat Saral
Original Assignee
Volkswagen Aktiengesellschaft
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 Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Publication of WO2016034336A1 publication Critical patent/WO2016034336A1/fr

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
    • 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
    • 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 valve drive device, in particular of a motor vehicle, with a camshaft having at least two axially displaceably arranged on a cam basic shaft cam pieces and a shift gate for the axial displacement of the cam pieces, according to the preamble of claim 1. Furthermore, the invention relates to a shift gate of such a valve train device.
  • variable valve trains in internal combustion engines by axial displacement of cam pieces with cams of different cam contour (eg, full-stroke cam,
  • Cam pieces are arranged displaceably. The torque transmission of the
  • Cam piece causes. Upon rotation of the cam piece this is forced to a defined axial switching path, the distance of two adjacent cams of a
  • Cam piece corresponds, shifted. If the cam piece is in a predetermined axial end position, the pin is retracted again or thrown back toward the actuator.
  • each cam piece two ejectable actuators are assigned to engage in each case a slide track of the shift gate, wherein the first slide track for adjusting the cam piece in an axial forward direction and the second Sliding track is provided for adjusting the cam piece in an axial reverse direction.
  • Such conventional valve drive devices require per cylinder actuator together with shift gate, since each cylinder is associated with an axially displaceable cam piece.
  • a plurality of shift gates and actuators is associated with a considerable cost and installation effort.
  • valve lift switching can only take place in the base circle of the cams.
  • valve lift switching can only take place in the base circle of the cams.
  • For the switching of the valve lift of two cylinders with a single axially displaceable cam piece is available for switching a smaller common cam base circle than when switching the valve strokes of two cylinders by means of two individual cam pieces. The valve and thus the
  • Cam strokes are on two cylinders, which are adjusted with a common cam piece be regularly rotated by 90 ° cam rotation angle to each other. These 90 ° cam rotation angles correspond to the reduction of the base circle available for displacement. For this reason, it is difficult to simultaneously switch several cylinders with a single cam piece.
  • Valve train devices in which a split shift gate is used for sequentially shifting two or more cam pieces.
  • a split shift gate is used for sequentially shifting two or more cam pieces.
  • Cam piece axially displaced by a first gate segment of the shift gate and then a second cam piece by a second gate segment of the shift gate.
  • both cam pieces have switched the valve lift.
  • first the second cam piece and then the first cam piece are pushed back and then each locked by means of a locking device for axially locking the cam pieces in the axial end position.
  • ball packs are used, which are located on the cam base shaft.
  • the invention has for its object to provide a valve drive device, with which the valve lifts several (especially four) cylinder can be switched by means of a single shift gate and works at the same time wear and reliable.
  • the shift gate of the valve drive device has at least one slide track with two in a switching operation of an actuating element, such as a pin of an actuator successively traversable track sections.
  • the track portions are arranged and arranged such that the engagement of the actuator in the first path portion of the rotating shift gate an axial displacement of the first cam piece in a forward direction and the subsequent engagement of the
  • Actuator in the second path portion causes an axial displacement of the second cam piece in a forward direction of the reverse direction.
  • first to the first web section coupled first cam piece axially displaced and then to the second
  • the displacement distance preferably corresponds in each case essentially to the distance between two adjacent cams (for example zero cams and full cams).
  • Cam base shaft are passed to the thrust bearings.
  • the thrust bearings in each shift both in the forward direction and in the reverse direction several times and therefore particularly heavily loaded.
  • two cam pieces by means of an actuator and a split shift gate at each
  • Actuating element sequentially passable return path sections, wherein the passage of the first return path portion of an axial displacement of the first
  • Cam piece in the reverse direction and passing through the second return path portion causes an axial displacement of the second cam piece in the forward direction. This leads to a particularly uniform load of the camshaft and
  • the shift gate prefferably has at least two sliding link segments which are displaceable relative to one another in the axial direction, which are each assigned to one of the cam pieces and each have a track section and / or a return track section ,
  • the first link segment is connected to the first cam piece or attached thereto or integrally or integrally formed therewith and / or the second gate segment connected to the second cam piece or attached thereto or integrally or integrally formed therewith.
  • each of the two link segments preferably has a web section and / or a return web section, so that first the web section (or return web section) of the first link segment and then the web section (or return web section) of the second axially displaceably mounted thereto Sliding segments can be traversed by the actuator.
  • the return path sections unlike the known valvetrain devices, the track portions do not helically rotate the cam base shaft (but at a point in time during the shifting operation, if that
  • each link track a Einspur- and / or Ausspurabrough with radial skew for meshing and / or Ausspuren of the actuating element in the / has slide track, wherein the Einspur- and / or
  • Ausspurabêt is preferably arranged axially offset from the track section.
  • the actuating element reaches, starting from the Einspurabrough the axially adjacent region of the web portion only after a full rotation of the camshaft.
  • the actuating element only reaches the Ausspurabrough starting from the axially adjacent to the Ausspurabough region of the track section after a full rotation of the camshaft.
  • the actuating element engages over an angle of more than 360 ° in the slide track in the course of a switching operation.
  • this passes through
  • the slide track in the circumferential direction of the camshaft in the following order: Einspurabrough the second (first) Gate segment, track section of the first (second) gate segment, track section of the second (first) gate segment, Ausspurabrough the first (second) gate segment.
  • the actuating element traverses the second guide track in the circumferential direction of the camshaft in the following order: second engagement section of the second (first) link segment, return path section of the first (second) link segment, return path section of the second (first)
  • the link segments are each formed substantially half-cylinder jacket, so that they preferably together form substantially a cam base shaft encircling hollow cylinder. Furthermore, two half-cylinder jackets can be moved axially against each other in a simple manner.
  • the two link segments are formed as equal parts.
  • the first gate segment corresponds to the second gate segment. In this way, manufacturing and assembly are further simplified.
  • Each link segment preferably has a track section and, in addition, a return track section which, as mutually adjacent circumferential grooves, carries with it
  • Circumferentially gradually decreasing mutual distance are formed.
  • a web gradually tapers between the web portion and the return web portion by a circumferential angle of 180 °.
  • the smallest distance between the web section and the return web section can only be a few millimeters, for example between 1 mm and 1 cm.
  • the maximum distance between the track section and the return track section may be greater by about 12 mm (the distance between two adjacent cams is regularly about 6 mm).
  • the Einspur- and Ausspurabitese are the same
  • Gateways each axially outside the railway and return rail sections of
  • the Einspur- and the Ausspurabrough the first slide track between the track portion and the return path portion of the link segments is arranged, and the Einspur- and the Ausspurabrough the second
  • Sliding track is arranged in each case on the side facing away from the first slide track side of the second slide track, or vice versa. In these two embodiments is not switched true to the cycle.
  • each cam piece has at least two spaced-apart ones
  • Cam sections each having at least two adjacent cams (eg.
  • each cam portion is associated with a cylinder.
  • each cam portion is associated with a cylinder.
  • only a single actuator with two actuators and a single shift gate required.
  • the present invention relates to a shift gate of a device according to the invention
  • the shift gate has two matching, preferably formed as equal parts, gate segments with the features described above, individually or in any combination.
  • the present invention relates to a gate segment of a shift gate according to the invention.
  • 1 is a schematic schematic diagram of a valve drive device 100 according to the invention
  • 2a shows three temporally successive positions of a first embodiment of a shift gate according to the invention during a shift operation
  • Shift gate in a perspective view and in a plan view
  • the valve drive device 100 has a camshaft 10 with two cam pieces 12, 14 arranged axially displaceably on a cam base shaft 11.
  • Each cam piece 12, 14 has four cam portions 17, each cam portion having two adjacent cams 19, which may have a different cam contour (here: full cam and zero cam).
  • Each two adjacent cam portions 17 are associated with a cylinder (not shown), so that the camshaft is provided for valve actuation of a total of four cylinders.
  • the actuating element 15 is to initiate a switching operation for the displacement of both cam pieces 12, 14 ejected and engages a shift gate 20 which is rotatably connected to the cam base shaft 1 1.
  • the shift gate 20 is formed by the mutually facing ends of the two cam pieces 12, 14.
  • the second actuating element 16 is ejected and engages in the shifting gate 20.
  • the shift gate 20 has two in the axial direction A relative to each other slidably mounted on the cam base shaft 1 1, substantially strichzylindermantelelförmige
  • Slotted segment 51 is connected to the second cam piece 14.
  • the link segments 50, 51 can also be integrally formed with the associated cam piece or otherwise coupled thereto.
  • Camshaft axis A is moved, and the second link segment 51 together with the second cam member 14 in a forward direction V opposite
  • Reverse direction R is moved.
  • the two cam pieces are moved in opposite directions on the camshaft. Accordingly, in the return switching operation, the first link segment 50 are displaced together with the first cam piece 12 in the reverse direction R back to the starting position, and the second link segment 51 is together with the second cam piece 14 in the
  • FIG. 2 shows a first embodiment of a shifting gate 20 according to the invention
  • the course of a shifting operation will be explained in detail below:
  • Web section 32 is correspondingly axially curved or inclined, so that the engagement of the actuating element 15 in the rotating web section 32 to a displacement of the second link segment 51 in the reverse direction R leads (see Fig. 2a, right figure).
  • the second link segment 51 has a Einspurabrough 35 in the form of a
  • the Einspur- and Ausspurabitese 35, 36 are each arranged axially adjacent to the track sections 31, 32, so that they offset by a camshaft rotation with respect to the
  • a second slide track 24 for returning the two cam pieces 12, 14 is arranged in the starting position in the shift gate.
  • the second actuating member 16 passes through the second link track 24 during a reset switching operation in the following order: Einspurabterrorism 37 of the second link segment 50 (see Fig. 2b, left figure), return path portion 33 of the first link segment 50 (see Fig. 2b, middle figure), return path section 34 of the second link segment 51, Ausspurabterrorism 38 of the first link segment 50 (see Fig. 2b, right figure).
  • the individual sections of the second slide track 24 are essentially one
  • Gate segments formed in the circumferential direction, in which the web 70 has a maximum width This leads to a particularly compact shift gate 20, with the cycle-faithful switching operations are possible.
  • FIGS. 4c and 4d show a second embodiment of a device according to the invention
  • Shift gate 20 ' shown, in which the two link segments 50', 51 'are also formed as identical parts and set up for circuit-faithful circuit. Except for the arrangement of the Einspur- and Ausspurabitese 35, 36, 37, 38 is on the above
  • the Ausspurabitese 36, 38 of the first link segment 50 ' are not arranged between the web portion and the return path portion, but in each case outside, in that end region of the first link segment 50' in
  • Circumferential direction in which the web 70 has a minimum width is a minimum width.
  • a single gate segment 50 '(or 51') of the second embodiment is shown in different views in FIGS. 4a and 4b.
  • the invention is not limited to the embodiments shown in the figures.
  • the two slide tracks can be pulled apart as required. Due to other system designs, an adjustment of the slide track and / or the
  • Actuators may, for example, a larger distance of the grooves may be required. Other embodiments are possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un dispositif d'entraînement de soupape qui comprend un arbre à cames pourvu d'au moins deux éléments de came disposés sur un arbre à cames de base de façon déplaçable axialement et une coulisse de commutation (20) destinée à déplacer axialement les éléments de came ; la coulisse de commutation (20) comporte une première piste de coulisse (22) pourvue de deux parties de piste (31, 32) qui peuvent être parcourues séquentiellement par un élément d'actionnement (15) lors d'un processus de commutation ; le parcours de la première partie de piste (31) entraîne un déplacement axial du premier élément de came dans un sens dirigé vers l'avant (V) et le parcours de la seconde partie de piste (32) entraîne un déplacement axial de la seconde partie de piste dans un sens dirigé vers l'arrière (R) opposé au sens dirigé vers l'avant.
PCT/EP2015/067189 2014-09-03 2015-07-27 Arbre à cames pourvu d'une coulisse de commutation WO2016034336A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014217584.4 2014-09-03
DE102014217584.4A DE102014217584B4 (de) 2014-09-03 2014-09-03 Ventiltriebvorrichtung sowie Schaltkulisse

Publications (1)

Publication Number Publication Date
WO2016034336A1 true WO2016034336A1 (fr) 2016-03-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/067189 WO2016034336A1 (fr) 2014-09-03 2015-07-27 Arbre à cames pourvu d'une coulisse de commutation

Country Status (2)

Country Link
DE (1) DE102014217584B4 (fr)
WO (1) WO2016034336A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112523831A (zh) * 2020-12-03 2021-03-19 杰锋汽车动力系统股份有限公司 一种用于内燃机的两级可变气门升程机构
CN112523830A (zh) * 2020-12-03 2021-03-19 杰锋汽车动力系统股份有限公司 用于内燃机的两级可变气门升程机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018000435B4 (de) 2018-01-19 2020-12-03 Daimler Ag Ventiltrieb für eine Verbrennungskraftmaschine. insbesondere eines Kraftfahrzeugs
US11959403B2 (en) * 2021-06-09 2024-04-16 Fca Us Llc Single actuator shifting cam system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007037747A1 (de) * 2007-08-10 2009-02-12 Daimler Ag Brennkraftmaschinenventiltriebumschaltvorrichtung
DE102009034990A1 (de) * 2009-07-28 2011-02-03 Daimler Ag Ventiltriebvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007056692A1 (de) 2007-11-24 2009-05-28 Daimler Ag Ventiltriebvorrichtung
DE102008029349A1 (de) 2008-06-20 2009-12-24 Daimler Ag Ventiltriebvorrichtung
DE102011011457A1 (de) 2011-02-17 2012-08-23 Daimler Ag Brennkraftmaschinenventiltriebvorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007037747A1 (de) * 2007-08-10 2009-02-12 Daimler Ag Brennkraftmaschinenventiltriebumschaltvorrichtung
DE102009034990A1 (de) * 2009-07-28 2011-02-03 Daimler Ag Ventiltriebvorrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112523831A (zh) * 2020-12-03 2021-03-19 杰锋汽车动力系统股份有限公司 一种用于内燃机的两级可变气门升程机构
CN112523830A (zh) * 2020-12-03 2021-03-19 杰锋汽车动力系统股份有限公司 用于内燃机的两级可变气门升程机构
CN112523830B (zh) * 2020-12-03 2022-05-24 杰锋汽车动力系统股份有限公司 用于内燃机的两级可变气门升程机构
CN112523831B (zh) * 2020-12-03 2022-05-24 杰锋汽车动力系统股份有限公司 一种用于内燃机的两级可变气门升程机构

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Publication number Publication date
DE102014217584A1 (de) 2016-03-03
DE102014217584B4 (de) 2024-10-02

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