WO2009062586A1 - Dispositif de commande de soupapes - Google Patents

Dispositif de commande de soupapes Download PDF

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Publication number
WO2009062586A1
WO2009062586A1 PCT/EP2008/008842 EP2008008842W WO2009062586A1 WO 2009062586 A1 WO2009062586 A1 WO 2009062586A1 EP 2008008842 W EP2008008842 W EP 2008008842W WO 2009062586 A1 WO2009062586 A1 WO 2009062586A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
drive device
valve drive
pairs
slide track
Prior art date
Application number
PCT/EP2008/008842
Other languages
German (de)
English (en)
Inventor
Jens Meintschel
Thomas Stolk
Alexander Von Gaisberg-Helfenberg
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2009062586A1 publication Critical patent/WO2009062586A1/fr

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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
    • 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 according to the preamble of claim 1.
  • valve train devices in particular an internal combustion engine, with at least one cam element, which is axially displaceable by means of a shift gate and which is intended to provide a switchable valve train known.
  • the invention is in particular the object of providing a valve drive device with a low switching noise and low wear. It is achieved according to the invention by the features of the independent claims. Further embodiments emerge from the subclaims.
  • the invention relates to a valve drive device, in particular an internal combustion engine, with at least one cam element, which is axially displaceable by means of a shift gate and which is intended to provide a switchable valve train.
  • the cam element has at least three cam pairs, which are intended to valves to actuate at least three cylinders.
  • a switchable valve drive device with a low switching noise and low wear and a small number of actuators can be realized.
  • the pairs of cams are switched in sections.
  • sections is to be understood in particular as meaning that a switchover of the valve drive takes place in different and in particular in time-separable switching sections, whereby several pairs of cams can be switched simultaneously in one switching section
  • a plurality of pairs of cams are to be understood, whereby a “multiply executed pair of cams” is to be understood as meaning a plurality of equivalent pairs of cams arranged axially on the camming element for a plurality of gas exchange valves of a cylinder
  • An embodiment according to the invention with three pairs of cams on one cam element is particularly suitable for a V-type engine with two cylinder banks, each of which has three cylinders iron, advantageous.
  • Such an engine normally has two cam elements which are designed separately for the cylinder banks and, in the case of a valvetrain designed in accordance with the invention, each have three cam pairs, which can be embodied in duplicate.
  • the cam element is made in one piece, which in particular switching noises can be further reduced.
  • a cam element with several partial cam elements is conceivable, which are preferably fixedly coupled for axial movement.
  • the cam element has at least a fourth cam pair.
  • an internal combustion engine having only one cam member for a valve side, such as an intake side can be realized.
  • a cam element with four pairs of cams is particularly advantageous for an internal combustion engine designed as a four-cylinder in-line engine. Alternatively, however, such an arrangement can also be used for a four-cylinder V-engine per cylinder bank.
  • the shift gate has at least a first slide track with at least two adjustment segments, which is intended to move the cam member sections in a switching direction axially.
  • the adjustment segments are assigned to different cam pairs.
  • the cam pairs can be switched with a time delay.
  • the term "assignable” should be understood in particular to mean that a changeover in the corresponding cam pair takes place from one cam to the other by means of this adjustment segment.
  • the first adjustment segment is arranged at least partially in the angular range of a base circle phase of at least one cam pair, at least this one cam pair can be switched by means of the first adjustment segment.
  • the second adjusting segment is arranged at least partially in the angular range of a base circle phase of at least one further cam pair, at least this further cam pair can be switched by means of the second adjusting segment, whereby the two cam elements can be switched in sections.
  • the shift gate has at least a second slide track, which is intended to move the cam member axially in a further switching direction. This makes it easy to switch back to the first position.
  • a second slide track which is intended to move the cam member axially in a further switching direction. This makes it easy to switch back to the first position.
  • Any arrangement of the slide tracks on the cam element is possible. For example, it is possible to perform the slide tracks separately, while also several pairs of cams can lie between the slide tracks. Alternatively, the slide tracks but also directly adjacent or running as intersecting slide tracks.
  • the second slide track on at least two Verstellsegmente, which are arranged mirror-symmetrically to the adjustment segments of the first slide track.
  • a section-wise switching of the cam element in a second switching direction which is advantageously opposite to the switching direction of the first shift gate, can advantageously be achieved.
  • a valve drive device for an internal combustion engine is proposed with at least one cam pair axially displaceable cam pair with two adjacently arranged part cam, which is intended to realize an adjustable valve train in which the partial cams have a different axial width.
  • all cam pairs can be arranged on an axially displaceable cam element, and a selection, which pairs of pairs can be switched in sections by an axial displacement of the cam element can be achieved by an embodiment of the cam pairs, in particular by the arrangement of the wide part cam and the narrow part cam.
  • Such a design of the partial cams of a cam pair is particularly advantageous for a V-engine, since an arrangement of the widened partial cams can be adapted to the firing order of the cylinders, in particular in the different cylinder banks.
  • the axial width of the one sub-cam is approximately twice as large as the axial width of the second sub-cam. This can be achieved by an axial displacement, in particular by a value which corresponds to one third of an axial width of the entire pair of cams, that depending on an initial position, a circuit of the valve train takes place or not, which can be easily realized a partially switchable valve train.
  • the actual measurement deviates by less than 20% from the specified measure, advantageously deviates by less than 10%, preferably deviates by less than 5% and particularly preferably by less than 2% from the specified measure ,
  • FIG. 1 is a perspective view of a valve drive device according to the invention
  • Fig. 2 shows an embodiment of a first slide track of the valve drive device
  • Fig. 3 is a perspective view of the slide track.
  • Figure 1 shows a valve train device of an internal combustion engine, which is designed as a series four-cylinder engine.
  • the valve drive device has a cam element 16 arranged on a cam element 16, which is axially displaceable by means of a shift gate 14 and over which an adjustable valve train is realized.
  • the camshaft 35 only partially penetrates the cam element 16.
  • an introduction of force into the cam element 16 via a camshaft 35, which, for example, penetrates less than 25% of the cam element 16, is also possible.
  • the cam member 16 has four cam pairs 10, 11, 12, 13, each with two partial cams 27, 28, 29, 30, 31, 32, 33, 34.
  • the pairs of cams 10, 11, 12, 13 are each made in duplicate, with the double components in the following being designated by the letters a and b for differentiation in the figures. However, since the dual components are equal in function, the letter will be omitted in the following description, but with both components indicated a and b in the figures being equivalent to each other.
  • Each double cam pair is assigned to a cylinder of the internal combustion engine.
  • An axial width of the partial cams 27, 28, 29, 30, 31, 32, 33, 34 of a cam pair 10, 11, 12, 13 is different in size.
  • the first part cam 27, 29, 31, 33 in this case has an axial width which is about twice as large as the axial width of the second part cam 28, 30, 32, 34.
  • All cam pairs have a base circle phase 20, 21, 22, 23 and an opening phase 36, 37, 38, 39.
  • the cam pair 10, 11, 12, 13 associated gas exchange valve 15 is closed and the corresponding part cam 27, 28, 29, 30, 31, 32, 33, 34 of the cam pair 10, 11, 12, 13 is relieved.
  • the opening phase 36, 37, 38, 39 the cam pair 10, 11, 12, 13 associated gas exchange valve 15 is opened and the corresponding part cam 27, 28, 29, 30, 31, 32, 33, 34 of the cam pair 10, 11, 12, 13 is charged.
  • a partial cam can be configured such that the gas exchange valve remains closed over a whole angle range.
  • the shift gate 14, by means of which the cam member 10, 11, 12, 13 can be moved axially, has two slide tracks 17, 24.
  • the valve drive device has two actuators with actuating pins 40, 41, which can engage in the guide tracks 17, 24 and via which a force for adjusting the cam member 16, or the cam pairs 10, 11, 12, 13 is provided. Actuators for actuating the actuating pins 40, 41 are known in the art and therefore not shown here.
  • the cam member 16 is thereby switched in sections, wherein the cam pairs 10, 11 of the first two cylinders form a section and the cam pairs 12, 13 of the last two cylinders another section.
  • the cam member 16 can be moved axially in a first switching direction.
  • the first slide track 17 has two adjustment segments 18, 19, which can be assigned to the different cam pairs 10, 11, 12, 13.
  • the adjusting segments 18, 19 are connected via an intermediate segment 42.
  • a Einspursegment 43 is arranged at the end of the slide track a Ausspursegment 44.
  • the slide track 17 with the Einspursegment 43, the first adjustment segment 18, the intermediate segment 42, the second adjustment segment 19 and the Ausspursegment 44 has an angular extent of about 630 °, ie it runs about VH times around the cam member 16 around.
  • the first adjustment segment 18, by means of which the cam member 16 is moved from a first switching position to a middle position, the cam pairs 10, 11 of the first two cylinders can be assigned.
  • the gas exchange valves of the first two cylinders are opened by the narrow partial cams 30, 32 of the corresponding cam pairs 10, 11 (compare FIG.
  • the gas exchange valves 15 of the last two cylinders are actuated in the first switching position by the wide part cam 31, 33 of the corresponding cam pairs 12, 13.
  • the first adjustment segment 18 is arranged in an angular range, which is the Grund Vietnamesephasen 20, 21 of the cam pairs 10, 11 of the first two cylinders assigned.
  • the cam pairs 10, 11 are moved from the first switching position to the middle position.
  • the gas exchange valves 15 of the first two cylinders on the wide part cam 27, 29 of the corresponding cam pairs 10, 11 actuated.
  • the gas exchange valves 15 of the two last cylinders are also opened in the intermediate position by the wide part cam 31, 33 of the corresponding cam pairs 12, 13. In this pair of cams 12, 13 was moved by the first adjustment segment 18 only under load, a position of cam followers 45 on the corresponding part cam 31, 33.
  • the second adjustment segment 19 of the first slide track 17 can be assigned to the cam pairs 12, 13 of the last two cylinders.
  • the second adjustment segment 19 displaces the cam element 16 from the middle position into a second switching position.
  • the second adjustment segment 19 is in an angular range, the base circle phases 22, 23 of the cam pairs 12, 13 of the last two cylinders can be assigned arranged.
  • the second adjustment segment 19 is in the cam pairs 12, 13 of the last two cylinders of the wide part cam 31, 33 of the corresponding pairs of cams 12, 13 changed to the narrow part cam 32, 34, wherein the cam pairs 12, 13 thereby in the base circle phase 22nd , 23 are located and thus relieved.
  • the cam pairs 10, 11 of the first two cylinders only one position of the cam followers 45 is displaced by the second adjusting segment 19 onto the corresponding, wide partial cams 27, 29, whereby they are loaded.
  • the gas exchange valves 15 of the first two cylinders are then actuated by the wide part cam 27, 29 of the corresponding cam pairs 10, 11.
  • the gas exchange valves 15 of the last two cylinders are through the narrow part cam 32, 34 of the corresponding cam pairs 12, 13 is actuated.
  • the second slide track 24 is constructed mirror-symmetrically to the first slide track 17.
  • the cam member 16 in a second switching direction which is directed opposite to the first switching direction, are moved. It also has two adjustment segments 25, 26.
  • the cam member 16 is moved from the second switching position to the intermediate position.
  • the cam member 16 is moved from the intermediate position to the first switching position.
  • the two slide tracks 17, 24 are executed separately.
  • the first slide track 17 is arranged between the cam pairs 10, 11 of the first two cylinders.
  • the second slide track 24 is arranged between the cam pairs 12, 13 of the last two cylinders. In principle, however, another arrangement of the slide tracks 17, 24 is possible.

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

Abstract

La présente invention concerne un dispositif de commande de soupapes appartenant notamment à un moteur à combustion interne, comprenant au moins trois paires de cames (10, 11, 12, 13) qui peuvent se déplacer axialement par sections au moyen d'une coulisse de commande (14) et sont conçues pour fournir à des soupapes d'échange gazeux (15) d'au moins trois cylindres, un dispositif de commande de soupapes (15) commutable. Selon l'invention, les paires de cames (10, 11, 12, 13) sont disposées sur un élément à cames (16) réalisé en une seule pièce.
PCT/EP2008/008842 2007-11-17 2008-10-18 Dispositif de commande de soupapes WO2009062586A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710054977 DE102007054977A1 (de) 2007-11-17 2007-11-17 Ventiltriebvorrichtung
DE102007054977.8 2007-11-17

Publications (1)

Publication Number Publication Date
WO2009062586A1 true WO2009062586A1 (fr) 2009-05-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/008842 WO2009062586A1 (fr) 2007-11-17 2008-10-18 Dispositif de commande de soupapes

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DE (1) DE102007054977A1 (fr)
WO (1) WO2009062586A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011011456A1 (de) * 2011-02-17 2012-08-23 Daimler Ag Brennkraftmaschinenventiltriebvorrichtung
DE102011011457A1 (de) 2011-02-17 2012-08-23 Daimler Ag Brennkraftmaschinenventiltriebvorrichtung
DE102013019260B4 (de) 2013-11-15 2022-05-12 Mercedes-Benz Group AG Ventiltrieb für eine Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5129407A (en) * 1991-06-10 1992-07-14 J. D. Phillips Corporation Variable camshaft
EP0579592A1 (fr) * 1992-07-13 1994-01-19 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Moteur à combustion interne à arbre à came à dispositif de positionnement axial variable
DE102005033018A1 (de) * 2005-07-15 2007-01-25 Schaeffler Kg Ventiltrieb für eine Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5129407A (en) * 1991-06-10 1992-07-14 J. D. Phillips Corporation Variable camshaft
EP0579592A1 (fr) * 1992-07-13 1994-01-19 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Moteur à combustion interne à arbre à came à dispositif de positionnement axial variable
DE102005033018A1 (de) * 2005-07-15 2007-01-25 Schaeffler Kg Ventiltrieb für eine Brennkraftmaschine

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Publication number Publication date
DE102007054977A1 (de) 2009-05-20

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