EP2643561A1 - Switchable cam follower - Google Patents

Switchable cam follower

Info

Publication number
EP2643561A1
EP2643561A1 EP11738728.2A EP11738728A EP2643561A1 EP 2643561 A1 EP2643561 A1 EP 2643561A1 EP 11738728 A EP11738728 A EP 11738728A EP 2643561 A1 EP2643561 A1 EP 2643561A1
Authority
EP
European Patent Office
Prior art keywords
lever
axis
turns
group
leg
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
EP11738728.2A
Other languages
German (de)
French (fr)
Other versions
EP2643561B1 (en
Inventor
Ronny GÜNNEL
Norbert Nitz
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2643561A1 publication Critical patent/EP2643561A1/en
Application granted granted Critical
Publication of EP2643561B1 publication Critical patent/EP2643561B1/en
Active 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0005—Deactivating valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20882—Rocker arms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an inner and an outer lever, wherein the rocker arm at one end at one end a system for a gas exchange valve and at the other end a complementary surface for a support element and one of the levers a top surface has a contact surface for a quasihubnocken and the other lever has a contact surface for a small or Nullhubnocken, wherein the levers via coupling means are connected to each other and relatively pivotally movable through holes on a common axis to each other, which axis of at least one Windungsb a Drehschenkelfeder is projected as a cam return spring, wherein a protruding from an end side of the Windungsevers first leg on a first clamping point of the outer lever and a projecting from another end side of the Windungsongs second leg to a second E Inspection point of the inner lift!
  • the winding package comprises at least one jack play and wherein an axial fixation of the axis caused by the system tension caused desachslix, segmented system of Windungsvons on the socket and thus their desachsierter plant via a segment-like part whose inner shell is shown on the axis.
  • Such a drag lever is known from DE 10 2006 046 574 A1, Fig. 1 previously. Shown is a bilaterally separated from the outer lever with a stump. The corresponding bushing in turn is surrounded by a winding package of a torsion spring, during system clamping the winding package presses the bushing segment-wise onto the axle, resulting in its axial fixation.
  • the bushing protrudes with a radially outwardly projecting from its inner wall into a complementary circumferential groove of the axis.
  • this object is achieved in that the clamping points of the two legs of the Windungsvons are positioned so that an intersecting force vectors in the Einspannticianen [effective direction of the two contact forces] included angle ⁇ in the range of 90 ° ⁇ ⁇ 180 °.
  • the trailing lever at the one end at the valve stem support should be a retracted trajectory.
  • the inner lever consists expediently of only a straight end bar, at the derr, each other cranked arms of the outer lever expire.
  • sufficient space for the Achsstümpfe is created with the Windungseveren.
  • the stub axles preferably do not protrude beyond the outer walls of the outer lever outside of the drawn-in section at the end of the gate.
  • a particularly secure fixation of the axle is present when, as proposed, a radial collar protrudes from the corresponding bush, which engages positively in a complementary groove of the axle.
  • the outer lever of the finger lever preferably, but not exclusively, a box-like geometry in plan view, wherein in the recess of the inner lifting! is included.
  • a box-like geometry in plan view, wherein in the recess of the inner lifting! is included.
  • the scope of this invention includes drag levers, which are provided, for example, for acting on at least one exhaust valve, wherein the outer lever of "regular” Indeedhubnocken acted upon is, whereas the inner lever of a "staggered” additional cam low lift contactable over which an internal exhaust gas recirculation can be displayed.
  • Figure 1 is a side view of the finger lever
  • FIG. 2 shows a plan view of the drag lever according to FIG. 1 and FIG. 3 shows a cross section through the drag lever in the region of the axis.
  • the drag lever 1 has at one end 5 on a bottom 4 a system 6 for a gas exchange valve.
  • the outer lever 3 has on the underside 4 a complementary surface 8 for mounting on a head of a support element.
  • the drag lever 1 has on a top side 9 of its inner lever 2 a here designed as a roller contact surface 10 for a Constant.
  • a roller contact surface 10 for a Constant.
  • the levers 2, 3 extend at one end 5 via their bores 13, 14 on a common axis 15 so as to be relatively pivotable relative to one another.
  • the axis 15 is "flying" with respect to the holes 13, 14 held, ie it is not axially fixed by a caulking, welding, snap ring fuse, etc.
  • the levers 2, 3 are braced to one another in a "folding knife-like" manner by a lost-motion spring designed as a turning leg spring 17.
  • the torsion spring 17 consists of two sections, which are stubs 27 of the axis protruding on both sides from outer sides of the outer lever 3 15 extend as a respective winding package 16.
  • a protruding from another, inner end face 21 of the respective Windungsvons 16 second leg 22 is below the axis 15 with a short arm 29 upwards away.
  • Each short arm 29 merges into a cross bar 30, which acts on a finger-like, from the inner lever 2 at one end 5 upwardly projecting lug 31, on which the second clamping point 23 is located.
  • the crossbars 30 engage over end pieces of the inner lever 2 and are united to form a common crosspiece.
  • each winding package 16 consists of only two windings at the bottom during system tensions.
  • the clamping points 20, 23 of the two legs 19, 22 of the winding package 16 are positioned such that a force vector intersecting in the clamping points 20, 23 [effective direction of the two contact forces Fi, F 2 ] included angle ⁇ in the range 90 ° ⁇ ⁇ 180 ° (see Fig. 1).
  • an angle ⁇ of clearly ⁇ 180 ° is selected so as not to completely stop the system distortion. ben.
  • this is realized by the aforementioned "raising" of the finger-like projection 31 with the second clamping point 23 on its inner side 33 for the second leg 22 of the rotary leg spring 17.
  • the "low-lying" second clamping point could be retained according to DE 10 2006 046 574 A1, FIG. 1, and the first clamping point 20 for the first leg 19 would be correspondingly “raised” here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Clamps And Clips (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Springs (AREA)

Abstract

A switchable cam follower (1) of a valve train of an internal combustion engine is proposed, having an inner lever and an outer lever (2, 3), wherein the levers (2, 3) can be connected to one another via coupling means (12) and run on a common pin (15) such that they can be moved pivotably relative to one another, which pin (15) is projected around by at least one group of turns (16) of a swivel pin spring (17) as cam restoring spring, wherein a first limb (19) which protrudes from an end side (18) of the group of turns (16) acts on a first clamping point (20) of the outer lever (3) and a second limb (22) which protrudes from another end side (21) of the group of turns (16) acts on a second clamping point (23) of the inner lever (2), in the rotational direction in such a way that the levers (2, 3) are present such that they are stressed towards one another, wherein the pin (15) runs in a "floating" manner with respect to the holes (13, 14), wherein the group of turns (16) comprises a bush (24) with play, wherein axial fixing of the pin (15) is produced via the offset contact of the group of turns (16) on the bush (24), which offset contact is brought about by the system stressing, and therefore the offset contact of said bush (24) on the pin (13), and wherein, in order to reduce a resulting contact force (FR) in the region of the contact of the group of turns (16) on the bush (24), the clamping points (20, 23) of the two limbs (19, 22) of the group of turns (16) are positioned in such a way that an angle (α) which is enclosed by intersecting force vectors at the clamping points (20, 23) [direction of action of the two contact forces (F1, F2)] lies in the range (90° < α < 180°).

Description

Bezeichnung der Erfindung  Name of the invention
Schaltbarer Schlepphebel Beschreibung Switchable rocker arm Description
Gebiet der Erfindung Die Erfindung betrifft einen schaltbaren Schlepphebel eines Ventiltriebs einer Brennkraftmaschine, mit einem Innen- und einem Außenhebel, wobei der Schlepphebel an einer Unterseite an einem Ende eine Anlage für ein Gaswechselventil und am anderen Ende eine Komplementärfläche für ein Abstützelement sowie einer der Hebel an einer Oberseite eine Anlauffläche für einen Großhubnocken und der andere Hebel eine Anlauffläche für einen Klein- oder Nullhubnocken besitzt, wobei die Hebel über Koppelmittel miteinander verbindbar sind sowie über Bohrungen auf einer gemeinsamen Achse relativ ver- schwenkbeweglich zueinander verlaufen, welche Achse von zumindest einem Windungspaket einer Drehschenkelfeder als Nockenrückstellfeder umragt ist, wobei ein von einer Stirnseite des Windungspakets abragender erster Schenkel auf einen ersten Einspannpunkt des Außenhebels und ein von einer anderen Stirnseite des Windungspakets abragender zweiter Schenkel auf einen zweiten Einspannpunkt des Innenhebe! im Verdrehsinn derartig einwirken, dass die Hebel aufeinanderzu verspannt vorliegen, wobei die Achse„fliegend" gegen- über den Bohrungen verläuft, wobei das Windungspaket wenigstens eine Buchse spielbehaftet umfasst und wobei eine Axialfixierung der Achse über die durch die Systemverspannung bewirkte desachsierte, segmentartige Anlage des Windungspakets auf der Buchse und somit deren desachsierter Anlage über einen segmentartigen Teil deren Innenmantels auf der Achse dargestellt ist. FIELD OF THE INVENTION The invention relates to a switchable rocker arm of a valve train of an internal combustion engine, with an inner and an outer lever, wherein the rocker arm at one end at one end a system for a gas exchange valve and at the other end a complementary surface for a support element and one of the levers a top surface has a contact surface for a Großhubnocken and the other lever has a contact surface for a small or Nullhubnocken, wherein the levers via coupling means are connected to each other and relatively pivotally movable through holes on a common axis to each other, which axis of at least one Windungspaket a Drehschenkelfeder is projected as a cam return spring, wherein a protruding from an end side of the Windungspakets first leg on a first clamping point of the outer lever and a projecting from another end side of the Windungspakets second leg to a second E Inspection point of the inner lift! acting in such a direction that the levers are clamped to each other, the axis "flying" opposite to the holes, wherein the winding package comprises at least one jack play and wherein an axial fixation of the axis caused by the system tension caused desachsierte, segmented system of Windungspakets on the socket and thus their desachsierter plant via a segment-like part whose inner shell is shown on the axis.
Ein derartiger Schlepphebel ist aus der DE 10 2006 046 574 A1 , Fig. 1 vorbekannt. Dargestellt ist eine beidseitig vom Außenhebel mit einem Stumpf abste- hende,„fliegend" gelagerte Achse, wobei jeder Stumpf von einer Buchse umragt ist. Die entsprechende Buchse wiederum ist von einem Windungspaket einer Drehschenkelfeder umfasst. Bei der Systemverspannung presst das Windungspaket die Buchse segmentartig auf die Achse, was zu deren Axialfixie- rung führt. Gemäß einer Ausführungsform ragt die Buchse mit einem von deren Innenwand radial einstehenden Ansatz in eine komplementäre Umfangsnut der Achse. Such a drag lever is known from DE 10 2006 046 574 A1, Fig. 1 previously. Shown is a bilaterally separated from the outer lever with a stump. The corresponding bushing in turn is surrounded by a winding package of a torsion spring, during system clamping the winding package presses the bushing segment-wise onto the axle, resulting in its axial fixation. According to one embodiment, the bushing protrudes with a radially outwardly projecting from its inner wall into a complementary circumferential groove of the axis.
Zur Absicherung eines Entkoppelmodus bei hohen Drehzahlen der Brennkraft- maschine (sichere Nockenrückführung des abgekoppelten Hebels) sowie zur Bewältigung der im Betrieb auftretenden hohen bewegten Massen sind hohe Rückstellmomente der Drehschenkelfeder notwendig. Dabei ist zu erkennen, dass nach dem Design gem. Fig. 1 der DE 10 2006 046 574 A1 die Kraftvektoren in den Einspannpunkten der beiden Schenkel der Drehschenkelfeder am Innen- und Außenhebel nahezu parallel zueinander verlaufen oder zumindest einen Winkel < 90° einschließen. Dies führt zu einer relativ hohen resultierenden Gesamtkraft im Abschnitt der desachsierten Anlage des Windungspakets. Anders gesagt ist der Betrag der resultierenden Gesamtkraft deutlich größer als der Betrag der einzelnen Kontaktkräfte in den Einspannpunkten. Im Entkop- pelmodus führt das auf die jeweilige Buchse aufgepresste Windungspaket eine Relativbewegung zur Buchse aus. Es kommt somit zu einem unerwünscht hohen Verschleiß im segmentartigen Anlagebereich des Windungspakets auf der Buchse. Es ist daher Aufgabe der Erfindung, den Verschleiß im Bereich der desachsierten Anlage des Windungspakets auf der Buchse, unter Beibehaltung eines hohen Rückstellmoments der Drehschenkelfeder, deutlich zu reduzieren. To ensure a decoupling mode at high speeds of the internal combustion engine (safe cam feedback of the uncoupled lever) and to cope with the high moving masses occurring during operation, high restoring torques of the torsion leg spring are necessary. It can be seen that according to the design gem. Fig. 1 of DE 10 2006 046 574 A1, the force vectors in the clamping points of the two legs of the torsion leg spring on the inner and outer lever almost parallel to each other or at least enclose an angle <90 °. This leads to a relatively high resulting total force in the section of the desachsierten conditioning of the winding package. In other words, the amount of the resulting total force is significantly greater than the amount of the individual contact forces in the chucking points. In decoupling mode, the winding package pressed onto the respective socket performs a relative movement to the socket. It thus comes to an undesirably high wear in the segment-like contact area of the winding package on the socket. It is therefore an object of the invention to significantly reduce the wear in the area of the desachsierten system of Windungspakets on the socket, while maintaining a high restoring torque of the torsion leg spring.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Einspannpunkte der beiden Schenkel des Windungspakets so positioniert sind, dass ein von sich schneidenden Kraftvektoren in den Einspannpunkten [Wirkrichtung der beiden Kontaktkräfte] eingeschlossener Winkel α im Bereich von 90°< α <180°liegt. Somit liegt ein schaltbarer Schlepphebel vor, bei dem die vorbeschriebenen Verschleißprobleme nicht mehr auftreten bzw. deutlich minimiert sind. Der Betrag der resultierenden Kontaktkraft ist nunmehr kleiner als der Betrag jeder der einzelnen Kontaktkräfte. Er wird jedoch geschickt so gewählt, dass er zur sicheren Achsfixierung zu keinem Betriebszeitpunkt gleich Null ist. According to the invention this object is achieved in that the clamping points of the two legs of the Windungspakets are positioned so that an intersecting force vectors in the Einspannpunkten [effective direction of the two contact forces] included angle α in the range of 90 ° <α <180 °. Thus, there is a switchable drag lever, in which the above-described wear problems no longer occur or are significantly minimized. The amount of the resulting contact force is now smaller than the amount of each of the individual contact forces. However, it is cleverly chosen to be zero for safe axle fixation at no time of operation.
Durch entsprechende Lagewahl der Einspannpunkte der Schenkel der Drehschenkelfeder wird nunmehr eine Wirkrichtung der beiden Kontaktkräfte er- zeugt, die zu einer drastisch reduzierten resultierenden Kontaktkraft im vorgenannten segmentartigen Anlagebereich führt. By appropriate choice of position of the clamping points of the legs of the torsion leg spring, a direction of action of the two contact forces is now generated, which leads to a drastically reduced resulting contact force in the aforementioned segmental contact area.
Gemäß einer zweckmäßigen Konkretisierung der Erfindung ist es vorgeschlagen, einen Ansatz des Innenhebels mit dem zweiten Einspannpunkt gegenüber dem eingangs beschriebenen St. d. T. einfach gesagt nach oben zu biegen (unter Beibehaltung oder lediglich geringer Veränderung des ersten Einspannpunkts), so dass bei Anlage des zweiten Schenkels der Drehschenkelfeder ein Winkel zwischen den beiden Kraftvektoren in den Einspannpunkten vorliegt, der deutlich größer als 90°, jedoch sichtbar kleiner als 180° ist. Ggf. kann auch lediglich der erste Einspannpunkt auf dem Außenhebel entsprechend verändert werden oder es werden beide Einspannpunkte umgestaltet. ινιιι νυι ι ι ι ι uci i_i i u iuui i σιι lyca i ιιυοοσι ι ιοι σιι ισ i_ucsui iy, uci weicher das wenigstens eine Windungspaket direkt auf der Achse verläuft. Somit erübrigt sich ein Einsatz der Buchse, was Kosten sparen hilft. According to an expedient concretization of the invention, it is proposed that an approach of the inner lever with the second clamping point relative to the above-described St. d. Simply said, bend upward (while maintaining or only slightly changing the first Einspannpunkts), so that when the second leg of the torsion leg spring an angle between the two force vectors in the Einspannpunkten is present, which is significantly greater than 90 °, but visibly smaller than 180 °. Possibly. If only the first clamping point on the outer lever can be changed accordingly or both clamping points are redesigned. ινιιι νυι ιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιιι Thus, a use of the socket is unnecessary, which saves costs.
Nach einer zweckmäßigen Fortbildung der Erfindung sollen je Windungspaket der Drehschenkelfeder nur zwei tragende Windungen vorgesehen sein. Da die Windungen beim Verdrehvorgang zueinander nicht gleich„verspannen", son- dem die schenkelnächste jeweils am stärksten eindreht, ist klar, dass bei einer Vielzahl von Windungen es hier zu Relativbewegungen der Windungen untereinander auf der Buchse kommt, die unerwünscht sind. Vom Schutzbereich eingeschlossen ist eine Lösung, bei welcher lediglich eine Drehschenkelfeder am einen Ende des Schlepphebels vorliegt, die bspw. die Achse zwischen Armen des Innenhebels mit ihrem Windungspaket umfasst. Alternativ kann lediglich ein Stumpf von einer der Seiten des Schlepphebels abragen, auf welchem dann ein respektives Windungspaket sitzt oder auf nur einem von zwei abragenden Stümpfen ist ein Windungspaket appliziert. According to an expedient development of the invention, only two load-bearing windings are to be provided per winding package of the torsion leg spring. Since the turns during the turning process do not "clamp" the same as each other, but in each case turn the knuckle closest in each case the strongest, it is clear that in the case of a large number of turns relative movements of the turns with one another occur on the bush, which are undesirable. Included in the scope of protection is a solution in which only one torsion spring is present at one end of the drag lever, which, for example, comprises the axis between arms of the inner lever with its winding packet. Alternatively, only a stump can protrude from one of the sides of the drag lever, on which then a respective package of windings sits, or a winding package is applied to only one of two projecting stumps.
Gemäß einer weiteren Konkretisierung der Erfindung soll dern 9chlepphebel an dem einen Ende bei der Ventilschaftauflage ein, eingezogener Verlauf imma- nent sein. Der Innenhebel besteht hierbei zweckmäßigerweise aus lediglich einem geraden Endbalken, an derr, aufeinanderzu gekröpfte Arme des Außenhebels auslaufen. Somit ist ausreichend Bauraum für die Achsstümpfe mit den Windungspaketen geschaffen. Die Achsstümpfe überragen hierbei vorzugsweise nicht die Außenwände des Außenhebels außerhalb des eingezogenen Ab- Schnitts am Ginen Ende. According to a further concretization of the invention, the trailing lever at the one end at the valve stem support should be a retracted trajectory. The inner lever consists expediently of only a straight end bar, at the derr, each other cranked arms of the outer lever expire. Thus, sufficient space for the Achsstümpfe is created with the Windungspaketen. The stub axles preferably do not protrude beyond the outer walls of the outer lever outside of the drawn-in section at the end of the gate.
Eine besonders sichere Fixierung der Achse liegt dann vor, wenn, wie vorgeschlagen, von der entsprechenden Buchse ein Radialkragen einsteht, welcher in eine komplementäre Nut der Achse formschlüssig eingreift. A particularly secure fixation of the axle is present when, as proposed, a radial collar protrudes from the corresponding bush, which engages positively in a complementary groove of the axle.
Der Außenhebel des Schlepphebels weist bevorzugt, jedoch nicht ausschließlich, eine in Draufsicht kastenartige Geometrie auf, wobei in dessen Aussparung der Innenhebe! aufgenommen ist. Es sind jedoch auch lediglich zwei längliche Balken denkbar und vorgesehen, welche Wand-an-Wand nebeneinander liegen. The outer lever of the finger lever preferably, but not exclusively, a box-like geometry in plan view, wherein in the recess of the inner lifting! is included. However, there are also only two elongated beams conceivable and provided, which are wall-to-wall next to each other.
Zur Minderung des Verschleißes in den Kontaktpunkten sowie an den segmentartigen Anlageflächen und Nockenanlaufflächen können aufgetragene Schichten u./o. Wärmebehandlungsmaßnahmen vorgesehen sein. To reduce the wear in the contact points and on the segment-like contact surfaces and cam contact surfaces coated layers u./o. Heat treatment measures are provided.
Außerdem sind vom Schutzumfang dieser Erfindung Schlepphebel umfasst, die bspw. zur Beaufschlagung von wenigstens einem Auslassventil vorgesehen sind, wobei deren Außenhebel von„regulären" Großhubnocken beaufschlagbar ist, wohingegen der Innenhebel von einem„versetzten" Zusatznocken niedrigen Hubes kontaktierbar ist, über den eine interne Abgasrückführung darstellbar ist. In addition, the scope of this invention includes drag levers, which are provided, for example, for acting on at least one exhaust valve, wherein the outer lever of "regular" Großhubnocken acted upon is, whereas the inner lever of a "staggered" additional cam low lift contactable over which an internal exhaust gas recirculation can be displayed.
Die Erfindung wird anhand der Zeichnung erläutert. Es zeigen: The invention will be explained with reference to the drawing. Show it:
• Fig. 1 eine Seitenansicht des Schlepphebels; • Figure 1 is a side view of the finger lever;
• Fig. 2 eine Draufsicht auf den Schlepphebel nach Fig. 1 und · Fig. 3 einen Querschnitt durch den Schlepphebel im Bereich der Achse. FIG. 2 shows a plan view of the drag lever according to FIG. 1 and FIG. 3 shows a cross section through the drag lever in the region of the axis.
Dargestellt ist ein schaltbarer Schlepphebel 1 eines Ventiltriebs einer Brennkraftmaschine mit einem länglichen Außenhebel 3, zwischen dessen Armen ein Innenhebel 2 verläuft. Shown is a switchable drag lever 1 of a valve train of an internal combustion engine with an elongated outer lever 3, between the arms of an inner lever 2 extends.
Der Schlepphebel 1 hat an einem Ende 5 an einer Unterseite 4 eine Anlage 6 für ein Gaswechselventil. Am anderen Ende 7 besitzt der Außenhebel 3 an der Unterseite 4 eine Komplementärfläche 8 zur Lagerung auf einem Kopf eines Abstützelements. The drag lever 1 has at one end 5 on a bottom 4 a system 6 for a gas exchange valve. At the other end 7, the outer lever 3 has on the underside 4 a complementary surface 8 for mounting on a head of a support element.
Der Schlepphebel 1 weist an einer Oberseite 9 seines Innenhebels 2 eine hier als Rolle ausgebildete Anlauffläche 10 für einen Großhubnocken auf. Als Gleit- i ια ι i uoycunuD ici ι ni iiaun iaiyi ici i ι ι i ier 11 ii luui ivjorxci i ι in lycyci ι on IU an ιThe drag lever 1 has on a top side 9 of its inner lever 2 a here designed as a roller contact surface 10 for a Großhubnocken. As Gleiti i ια i uyuuniD ici ι ni iiaun iaiyi ici i ι i ι i ier 11 ii luui ivjorxci i ι in lycyci ι on IU an ι
Außenhebel 4 angeordnet. Im Bereich des anderen Endes 7 sind längs verla- gerbare und nicht näher zu beschreibende Koppelmittel 12 appliziert. Outside lever 4 is arranged. In the region of the other end 7, longitudinally displaceable coupling means 12 which are not to be described in more detail are applied.
Zu erkennen ist des Weiteren, dass die Hebel 2, 3 an dem einen Ende 5 über ihre Bohrungen 13, 14 auf einer gemeinsamen Achse 15 relativ verschwenk- beweglich zueinander verlaufen. Die Achse 15 ist„fliegend" gegenüber den Bohrungen 13, 14 gehalten, d. h. sie ist nicht durch eine Verstemmung, Verschweißung, Sprengringsicherung etc. axial fixiert. Die Hebel 2, 3 sind durch eine als Drehschenkelfeder 17 bzw. Haarnadelfeder ausgebildete Lost-Motion-Feder zueinander„klappmesserartig" verspannt. Wie dargestellt, besteht die Drehschenkelfeder 17 aus zwei Abschnitten, die beidseitig auf von Außenseiten des Außenhebels 3 abragenden Stümpfen 27 der Achse 15 als jeweiliges Windungspaket 16 verlaufen. It can further be seen that the levers 2, 3 extend at one end 5 via their bores 13, 14 on a common axis 15 so as to be relatively pivotable relative to one another. The axis 15 is "flying" with respect to the holes 13, 14 held, ie it is not axially fixed by a caulking, welding, snap ring fuse, etc. The levers 2, 3 are braced to one another in a "folding knife-like" manner by a lost-motion spring designed as a turning leg spring 17. As shown, the torsion spring 17 consists of two sections, which are stubs 27 of the axis protruding on both sides from outer sides of the outer lever 3 15 extend as a respective winding package 16.
Es wirkt je ein von einer äußeren Stirnseite 18 des Windungspakets 16 unterhalb der Achse 15 längs abragender erster Schenkel 19 auf einen ersten Einspannpunkt 20 des Außenhebels 3 vor den Anlaufflächen 1 1 ein. Ein von einer anderen, inneren Stirnseite 21 des jeweiligen Windungspakets 16 abstehender zweiter Schenkel 22 steht unterhalb der Achse 15 mit einem Kurzarm 29 nach oben weg. Jeder Kurzarm 29 geht in einen Querbügel 30 über, der auf einen fingerartigen, vom Innenhebel 2 am einen Ende 5 nach oben abstehenden Ansatz 31 einwirkt, an welchem der zweite Einspannpunkt 23 liegt. Wie zu erken- nen ist, übergreifen die Querbügel 30 Endstücke des Innenhebels 2 und sind zu einem gemeinsamen Querstück vereinigt. It acts one each of an outer end face 18 of the Windungspakets 16 below the axis 15 along protruding first leg 19 to a first clamping point 20 of the outer lever 3 in front of the contact surfaces 1 1 a. A protruding from another, inner end face 21 of the respective Windungspakets 16 second leg 22 is below the axis 15 with a short arm 29 upwards away. Each short arm 29 merges into a cross bar 30, which acts on a finger-like, from the inner lever 2 at one end 5 upwardly projecting lug 31, on which the second clamping point 23 is located. As can be seen, the crossbars 30 engage over end pieces of the inner lever 2 and are united to form a common crosspiece.
Eine Axialfixierung der Achse 15 ist über die durch die Systemverspannung bewirkte desachsierte, segmentartige Anlage des jeweiligen Windungspakets 16 auf der entsprechenden Buchse 24 und somit deren desachsierter Anlage über einen segmentartigen Teil 25 deren Innenmantels 26 auf der Achse 15 dargestellt, wobei über den aus Fig. 3 hervorgehenden Radialkragen 34 ein Formschluss gegeben ist. Wie zudem zu erkennen ist, besteht jedes Windungspaket 16 aus lediglich zwei an der Unterseite bei der Systemverspannung tragenden Windungen. An axial fixation of the axis 15 is shown on the effected by the system tension desachsierte segment-like contact of the respective Windungspakets 16 on the corresponding bushing 24 and thus their desachsierter conditioning via a segment-like part 25 whose inner shell 26 on the axis 15, wherein on the from FIG. 3 resulting radial collar 34 is given a positive connection. As can also be seen, each winding package 16 consists of only two windings at the bottom during system tensions.
Zur Reduzierung einer resultierenden Kontaktkraft FR im Bereich der desach- sierten Anlage des Windungspakets 16 auf der Buchse 24 sind die Einspannpunkte 20, 23 der beiden Schenkel 19, 22 des Windungspakets 16 so positio- niert, dass ein von sich schneidenden Kraftvektoren in den Einspannpunkten 20, 23 [Wirkrichtung der beiden Kontaktkräfte Fi, F2] eingeschlossener Winkel α im Bereich 90°< α <180° liegt (s. Fig. 1 ). Es wird jedoch ein Winkel α von sichtlich < 180° gewählt, um die Systemverspannung nicht vollständig aufzuhe- ben. Im Vergleich zum eingangs genannten St. d. Technik DE 10 2006 046 574 A1 , Fig. 1 wird dies durch das vorgenannte„Hochstellen" des fingerartigen Ansatzes 31 mit dem zweiten Einspannpunkt 23 an seiner Innenseite 33 für den zweiten Schenkel 22 der Drehschenkelfeder 17 realisiert. In order to reduce a resulting contact force F R in the vicinity of the desached system of the winding package 16 on the bush 24, the clamping points 20, 23 of the two legs 19, 22 of the winding package 16 are positioned such that a force vector intersecting in the clamping points 20, 23 [effective direction of the two contact forces Fi, F 2 ] included angle α in the range 90 ° <α <180 ° (see Fig. 1). However, an angle α of clearly <180 ° is selected so as not to completely stop the system distortion. ben. Compared to the aforementioned St. d. Technique DE 10 2006 046 574 A1, Fig. 1, this is realized by the aforementioned "raising" of the finger-like projection 31 with the second clamping point 23 on its inner side 33 for the second leg 22 of the rotary leg spring 17.
Alternativ hierzu könnte der„tiefliegende" zweite Einspannpunkt nach der DE 10 2006 046 574 A1 , Fig. 1 beibehalten und der erste Einspannpunkt 20 für den ersten Schenkel 19 würde hier entsprechend„hochgesetzt" werden. Alternatively, the "low-lying" second clamping point could be retained according to DE 10 2006 046 574 A1, FIG. 1, and the first clamping point 20 for the first leg 19 would be correspondingly "raised" here.
Liste der Bezugszahlen und -zeichen ) Schlepphebel 32) Außenseite Innenhebel) Innenhebel 33) lnnenseiteList of Reference Numbers and Symbols) Drag lever 32) Outer inner lever side) Inner lever 33) Inner side
) Außenhebel 34) Radialkragen) Outer lever 34) radial collar
) Unterseite 35) Ringnut) Bottom 35) Ring groove
) eines Ende) one end
) Anlage Kontaktkraft erster Ein) anderes Ende spannpunkt) Contact contact force first one) other end tension point
) Komplementärfläche F2) Kontaktkraft zweiter Ein) Oberseite spannpunkt) Complementary surface F 2 ) Contact force second A) Top clamping point
0) Anlauffläche Großhubnocken FR) resultierende Kontaktkraft 1) Anlauffläche Kleinhubnocken a)Winkel zwischen Kraftvekto¬2) Koppelmittel ren0) contact surface Großhubnocken FR) resulting contact force 1) contact surface Kleinhubnocken a) angle between Kraftvekto¬2) coupling agent ren
3) Bohrung3) bore
4) Bohrung4) bore
5) Achse5) axis
6) Windungspaket 6) winding package
7) Drehschenkelfeder7) torsion leg spring
8) äußere Stirnseite8) outer face
9) erster Schenkel9) first leg
) erster Einspannpunkt ) first clamping point
1) andere Stirnseite1) other front side
) zweiter Schenkel ) second leg
) zweiter Einspannpunkt ) second clamping point
) Buchse ) Rifle
) segmentartiger Teil Buchse ) segment-like part socket
) Innenmantel Buchse ) Inner jacket bushing
) Stumpf ) Stump
) Außenseite Außenhebel ) Outside outside lever
) Kurzarm ) Short-sleeved
) Querbügel ) Crossbar
) fingerartiger Ansatz  ) finger-like approach

Claims

Patentansprüche claims
1. Schaltbarer Schlepphebel (1 ) eines Ventiltriebs einer Brennkraftmaschine, mit einem Innen- und einem Außenhebel (2, 3), wobei der Schlepphebel (1) an einer Unterseite (4) an einem Ende (5) eine Anlage (6) für ein Gaswechselventil und am anderen Ende (7) eine Komplementärfläche (8) für ein Abstützelement sowie einer der Hebel (2) an einer Oberseite (9) eine Anlauffläche (10) für einen Großhubnocken und der andere Hebel (3) eine Anlauffläche (1 1 ) für einen Klein- oder Nullhubnocken besitzt, wobei die Hebel (2, 3) über Koppelmittel (12) miteinander verbindbar sind sowie über Bohrungen (13, 14) auf einer gemeinsamen Achse (15) relativ verschwenkbeweglich zueinander verlaufen, welche Achse (15) von zumindest einem Windungspaket (16) einer Drehschenkelfeder (17) als Nockenrückstellfeder umragt ist, wobei ein von einer Stirnseite (18) des Windungspakets (16) abragender erster Schenkel (19) auf einen ersten Einspannpunkt (20) des Außenhebels (3) und ein von einer anderen Stirnseite (21) des Windungspakets (16) abragender zweiter Schenkel (22) auf einen zweiten Einspannpunkt (23) des Innenhebel (2) im Verdrehsinn derartig einwirken, dass die Hebel (2, 3) aufeinander verspannt vorliegen, wobei die Achse (15)„fliegend" gegenüber den Bohrungen (13, 14) verläuft, wobei das Windungspaket (16) wenigstens eine Buchse (24) spielbehaftet umfasst, wobei eine Axialfixierung der Achse ( 5) über die durch die Systemverspannung bewirkte desachsierte, segmentartige Anlage des Windungspakets (16) auf der Buchse (24) und somit deren desachsierter Anlage über einen segmentartigen Teil (25) deren Innenmantels (26) auf der Achse (13) dargestellt ist und wobei, zur Reduzierung einer resultierenden Kontaktkraft (FR) im Bereich der desachsierten Anlage des Windungspakets (16) auf der Buchse (24), die Einspannpunkte (20, 23) der beiden Schenkel (19, 22) des Windungspakets (16) so positioniert sind, dass ein von sich schneidenden Kraftvektoren in den Einspannpunkten (20, 23) [Wirkrichtung der beiden Kontaktkräfte (Fi, F2)] eingeschlossener Winkel (a) im Bereich (90°< a <180°) liegt. 1. Switchable drag lever (1) of a valve train of an internal combustion engine, with an inner and an outer lever (2, 3), wherein the drag lever (1) on an underside (4) at one end (5) a plant (6) for a Gas exchange valve and at the other end (7) has a complementary surface (8) for a support element and one of the levers (2) on one upper side (9) a contact surface (10) for a high-lift cam and the other lever (3) has a contact surface (1 1) for a small or Nullhubnocken has, wherein the levers (2, 3) via coupling means (12) are connected to each other and via bores (13, 14) on a common axis (15) relatively pivotable to each other, which axis (15) of at least one winding package (16) of a rotary leg spring (17) is embossed as a cam return spring, wherein a of a front side (18) of the Windungspakets (16) protruding first leg (19) on a first clamping point (20) of the outer lever (3) and one of another s end face (21) of the Windungspakets (16) projecting second leg (22) on a second clamping point (23) of the inner lever (2) in the sense of rotation act such that the levers (2, 3) are braced against each other, the axis (15) "Flying" with respect to the bores (13, 14), wherein the winding package (16) comprises at least one bushing (24) with play, whereby an axial fixation of the axis (5) over the caused by the system strain desachsierte, segment-like installation of the Windungspakets (16 ) on the bushing (24) and thus their desachsierter plant via a segmental part (25) whose inner shell (26) on the axis (13) is shown and wherein, to reduce a resulting contact force (F R ) in the region of the desachsierten system of Windungspakets (16) on the bush (24), the clamping points (20, 23) of the two legs (19, 22) of the Windungspakets (16) are positioned so that a intersecting force vectors in the clamping points (20, 23) [effective direction of the two contact forces (Fi, F 2 )] included angle (a) is in the range (90 ° <a <180 °).
2. Schlepphebel nach Anspruch 1 , wobei die Achse (15) beidseits mit einem Stumpf (27) über Außenseiten (28) des Außenhebels (3) hinaussteht, wobei auf jedem Stumpf (27) ein Windungspaket (16) mit Buchse (24) sitzt, wobei je Windungspaket (16) der erste Schenkel (19) der Drehschenkelfeder (17) von der außen liegenden einen Stirnseite (18) unterhalb der Achse (15) in Hebellängsrichtung schräg auf die Oberseite (9) zu abragt und auf den obenliegenden ersten Einspannpunkt (20) des Außenhebels (3) agiert, wobei der zweite Schenkel (22) der Drehschenkelfeder (17) von der innen liegenden, anderen Stirnseite (21 ) unterhalb der Achse (15) mit einem Kurzarm (29) wegsteht, welcher Kurzarm (29) in einen Querbügel (30) übergeht, der auf einen fingerartigen, vom Innenhebel (2) am einen Ende (5) abstehenden Ansatz (31 ) einwirkt, an welchem der zweite Einspannpunkt (23) liegt. 2. rocker arm according to claim 1, wherein the axis (15) protrudes on both sides with a stump (27) on outer sides (28) of the outer lever (3), wherein on each stump (27) a Windungspaket (16) with socket (24) sits , Wherein each Windungspaket (16) of the first leg (19) of the rotary leg spring (17) from the outer one end face (18) below the axis (15) obliquely in the lever longitudinal direction on the top (9) protrudes and on the overhead first clamping point (20) of the outer lever (3), wherein the second leg (22) of the torsion leg spring (17) protrudes from the inner, other end face (21) below the axis (15) with a short arm (29), which short arm (29 ) merges into a transverse bar (30), which acts on a finger-like, by the inner lever (2) at one end (5) projecting shoulder (31) on which the second clamping point (23).
3. Schlepphebel nach Anspruch 2, wobei der fingerartige Ansatz (31) des Innenhebels (2) als im Wesentlichen aufrecht von der Unterseite (4) in Richtung zur Oberseite (9) ragend dargestellt ist, wobei je Windungspaket (16) der Kurzarm (29) im Wesentlichen als von der Unter- zur Oberseite (4, 9) an Außenseiten (28) des Außenhebels (2) laufend vorliegt sowie im Bereich der Oberseite (9) in den quer zur Hebellängsachse sich erstreckenden Querbügel (30) übergeht, welcher Querbügel (30) End- ctü ko Hoc Innonhoholc fO\ nhornraift cnu/in an oinnr Innoncoitn C^V Hoc fingerartigen Ansatzes (31 ) den zweiten Einspannpunkt (23) hat. 3. rocker arm according to claim 2, wherein the finger-like projection (31) of the inner lever (2) as a substantially upright from the bottom (4) in the direction of the top (9) protruding, wherein each winding package (16) of the short arm (29 ) substantially as from the bottom to the top (4, 9) on outer sides (28) of the outer lever (2) is present continuously and in the region of the top (9) in the transversely extending to the longitudinal axis of the lever crossbar (30) merges, which cross bar (30) At the end of the Innocent, the innermost layer (23) has the second clamping point (23).
4. Schlepphebel nach Anspruch 3, wobei die beiden Querbügel (30) der zweiten Schenkel (22) der beiden Windungspakete (16) zu einem gemeinsamen Querstück vereinigt sind. 4. drag lever according to claim 3, wherein the two transverse yoke (30) of the second leg (22) of the two Windungspakete (16) are united to form a common crosspiece.
5. Schlepphebel nach Anspruch 1 , wobei je Windungspaket (16) zwei tragende Windungen vorgesehen sind. Schlepphebel nach einem der vorangehenden Ansprüche, wobei, von dem anderen zum einen Ende (7, 5) gesehen, der Schlepphebel (1 ) in einem sich verjüngenden Abschnitt mit der Achse (15) ausläuft, derart, dass die Achse (15) nicht über die Außenseiten (28) des Außenhebels (3) außerhalb des sich verjüngenden Abschnitts ragt. 5. drag lever according to claim 1, wherein each winding package (16) two supporting windings are provided. Cam follower according to one of the preceding claims, wherein, viewed from the other end to an end (7, 5), the cam follower (1) in a tapered portion with the axis (15) expires, such that the axis (15) is not over the outer sides (28) of the outer lever (3) project outside of the tapered portion.
Schlepphebel nach Anspruch 1 , wobei von dem Innenmantel (26) der wenigstens einen Buchse (24) ein die Achse (15) spielbehaftet umfassender Radialkragen (34) einsteht, dem auf der Achse (15) eine komplementäre Ringnut (35) gegenüberliegt, welcher Radialkragen (34) mit einem segmentartigen Abschnitt in der Ringnut (35) sitzt. Drag lever according to claim 1, wherein of the inner casing (26) of the at least one bushing (24) has a the axis (15) playful comprehensive radial collar (34), on the axis (15) opposite a complementary annular groove (35), which radial collar (34) with a segment-like portion in the annular groove (35) sits.
EP11738728.2A 2010-11-25 2011-08-02 Switchable cam follower Active EP2643561B1 (en)

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DE102010052551A DE102010052551A1 (en) 2010-11-25 2010-11-25 Switchable drag lever
PCT/EP2011/063296 WO2012069215A1 (en) 2010-11-25 2011-08-02 Switchable cam follower

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US8783219B2 (en) 2014-07-22
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CN103228875B (en) 2015-10-14
US20130220250A1 (en) 2013-08-29

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