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EP2929152A1 - Levier intermédiaire - Google Patents

Levier intermédiaire

Info

Publication number
EP2929152A1
EP2929152A1 EP13805747.6A EP13805747A EP2929152A1 EP 2929152 A1 EP2929152 A1 EP 2929152A1 EP 13805747 A EP13805747 A EP 13805747A EP 2929152 A1 EP2929152 A1 EP 2929152A1
Authority
EP
European Patent Office
Prior art keywords
intermediate lever
cam
face
side plates
crossbar
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.)
Withdrawn
Application number
EP13805747.6A
Other languages
German (de)
English (en)
Inventor
Wolfgang Christgen
Michael Schober
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 EP2929152A1 publication Critical patent/EP2929152A1/fr
Withdrawn legal-status Critical Current

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
    • F01L1/185—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
    • F01L13/0015—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
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
    • 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
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L2001/467—Lost motion springs
    • 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
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to intermediate lever for a variable-stroke valve drive of an internal combustion engine, with two upright and spaced side plates a) at a first end face on the one hand a support surface for a slide track and on the other hand, a stop surface for a cam, the b) in a longitudinal center section a mating surface for have a lift cams and the c) are connected at a further front end via a cross-piece connected transom, the outside of the variable transmission of a stroke of the lift cam on a tap of a follower member, wherein a lying in the pivoting direction of the intermediate lever end of the crossbar as an attachment for an end a cam return spring acting upon the intermediate lever is provided, and two tabs for the lateral guidance of the cam return spring protrude from this end face.
  • Such an intermediate lever is shown in FIG. 2 of DE 10201 1003898 A1.
  • the disadvantage is that the tabs are connected integrally to guide the cam return spring at the other end. This area presents itself as problematic in mass production because of its comparatively complicated training. Just a precise and clean training lying between the integrally connected tabs Endstirn to rest a leg of the cam return spring may not process reliable and too expensive. Possibly. this area must be elaborately reworked. It is also clear that, depending on the manufacturing process, a formation of particularly spaced from the end face tabs is complicated. In addition, it is noted that the partial sliding tap (support or abutment surface) at the first end unnecessarily increases the valve train friction. The task is to create an intermediate lever without the mentioned disadvantages.
  • a "clean" guide region for the cam return spring on the intermediate lever is to be created by simple means.
  • This object is achieved in that the tabs are part of a separately connected with the intermediate lever bow-like component, which is the one end face, to represent a direct investment of Cam return spring on the material of the intermediate lever, not swept over.
  • a lateral guidance of the cam return spring is shown on the intermediate lever without complex manufacturing process.
  • the tools for the production of preferably made of thin-walled steel sheet punching and bending technology illustrated intermediate lever are easier. It is to be expected with less tool wear or rejects. Possibly. can be maintained for different intermediate lever a uniform bracket-like component.
  • the proposed intermediate lever can u. a. be used in a fully variable valve train for throttle-free load control, as it is installed by the Bavarian Motor Works under the name "Valvetronic".
  • the intermediate lever can also be machined or cast or sintered or the like.
  • the intermediate lever according to the invention can also be perforated or provided with other, window-like recesses for further weight savings in the region of the side plates.
  • the two extensions listed according to claim at the other end of the intermediate lever it is conceivable and provided that only one or no extension is present at this front end, so that the bottom for variable stroke transmission may possibly be only the lower end of the intermediate lever.
  • the stirrup-like component with transverse strut which mainly arrives in this invention and whose tabs now implement the lateral guidance of the cam return spring (lost-motion spring), can be produced, for example, from sheet metal in a simple stamping and bending process. Possibly. However, is also a solid material training cast or the like. Conceivable and intended. Also, depending on a separate tab may be attached directly to an outer side of the respective side plate of the intermediate lever, these tabs need not be connected to each other via the aforementioned cross member. You can in this case to the side plate u. a. welded, clipped or the like. Be.
  • the bracket-like component saves the system in this area.
  • a leg of the cam return spring on the material of the intermediate lever is of a transverse end of the crossbar of the intermediate lever in the component in one piece hook-like, outwardly arched approach.
  • an involute profile or a profile that is at least similar to it can be present.
  • the hook-like approach can also be present as a separately joined to the intermediate lever component, so that the main body of the intermediate lever is even easier to produce.
  • the support or abutment surface of the intermediate lever at the first front end or its vicinity may be present as at least one roller or sliding surface. The same applies to the cam counterface.
  • the side plates are connected to each other at the first end face via a stiffening bracket, wherein a plurality of brackets are conceivable.
  • the bracket can be one piece from the intermediate lever.
  • it is also conceivable as a separate component. Possibly. extends from each side plate, a strap piece, which strap pieces are connected together in the region of their then facing each other ends.
  • FIG. 1 shows a three-dimensional view of an intermediate lever
  • Fig. 2 is a detail view of the bow-like component
  • FIG. 3 shows a detailed view of the intermediate lever in the region of its further front end.
  • Figure 1 discloses an intermediate lever 1 for a variable-stroke valve drive of an internal combustion engine. This is available as a sheet metal component. He has two The spaced side plates 2. These summarize at a first end face 3 designed as a double role supporting surface 4 for a slide track.
  • the double rollers include a trained as a roller, central contact surface 5 for a cam. Support and contact surface 4, 5 extend on an axis 24 connecting the side plates 2 to the first end 3.
  • a longitudinal center section 6 of the intermediate lever 1 has a positioned between its side plates 2 and designed as a roller mating surface 7 for a here attacking from the right, not shown lifting cams.
  • the mating surface 7 in turn sits on an axis 23rd
  • the side plates 2 are connected to each other via an integrally connected crossbar 9.
  • An outer side 10 of the crossbar 9 is used for variable transmission of a stroke of the lifting cam to a tap of a drag lever as a follower, wherein the region shown on the left side of the outside as Nullhub- and the right side shown portion of the outside as a lifting section.
  • each side plate 2 merges at the further front end 8 into an extension 15, 16 which projects in each case in the lever pivoting direction and which is connected via the transverse bar 9 to its lower end 14.
  • extension 15, 16 projects in each case in the lever pivoting direction and which is connected via the transverse bar 9 to its lower end 14.
  • the extension 15 has a left end end 1 1 here. This serves as an abutment for an end of the intermediate lever 1 acting on the cam return spring and is formed on an outer surface 22 of a hook-like projection 18 which protrudes from a transverse end 17 of the crossbar 9 in one piece.
  • a separate, bracket-like component 13 is attached to the abovementioned end face 1 1, which component is shown as a detail in FIG.
  • the component 13 has a transverse strut 19, protrude from the two tabs 12.
  • the cross member 19 is firmly seated between an inner surface 20 of the projection 18 and free ends 21 of the extension 15 of the side plates 2 (s. a. FIG. 3).
  • the tabs 12 serve for a lateral guidance of a leg of the cam return spring, ie they enclose the leg (see, for example, DE 102 35 402 A1, FIG. 1).

Landscapes

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

Abstract

L'invention concerne un levier intermédiaire (1) pour un mécanisme de distribution à levée variable d'un moteur à combustion interne, comportant deux plaques latérales (2) verticales et espacées l'une de l'autre, qui a) présentent, à une première extrémité frontale (3), d'une part une surface d'appui (4) pour une glissière ainsi que, d'autre part, une surface de butée (5) pour une came, qui b) dans une partie centrale (6) de la longueur, possèdent une surface homologue d'appui (7) pour une came de levage et qui c), à une autre extrémité frontale (8) sont reliées par l'intermédiaire d'une barre transversale (9) formant une seule pièce avec le levier intermédiaire et dont le côté extérieur (10) sert à la transmission variable du levage de la came de levage à une prise d'un élément suiveur, un élément frontal d'extrémité (11) de la barre transversale (9) qui se trouve dans la direction de pivotement du levier intermédiaire (1) étant utilisé comme appui pour une extrémité d'un ressort de rappel de came qui sollicite le levier intermédiaire (1), deux pattes (12) qui servent au guidage latéral du ressort de rappel de came faisant saillie par rapport à cet élément frontal d'extrémité (11), lesquelles pattes (12) font partie intégrante d'un élément (13) analogue à un étrier qui est assemblé séparément du levier intermédiaire (1), l'élément (13) ne recouvrant pas l'élément frontal d'extrémité (11), pour constituer un appui direct du ressort de rappel de came sur la matière du levier intermédiaire (1).
EP13805747.6A 2012-12-06 2013-10-10 Levier intermédiaire Withdrawn EP2929152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012222374.6A DE102012222374A1 (de) 2012-12-06 2012-12-06 Zwischenhebel
PCT/DE2013/200210 WO2014086346A1 (fr) 2012-12-06 2013-10-10 Levier intermédiaire

Publications (1)

Publication Number Publication Date
EP2929152A1 true EP2929152A1 (fr) 2015-10-14

Family

ID=49765748

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13805747.6A Withdrawn EP2929152A1 (fr) 2012-12-06 2013-10-10 Levier intermédiaire

Country Status (4)

Country Link
EP (1) EP2929152A1 (fr)
CN (1) CN104854317A (fr)
DE (1) DE102012222374A1 (fr)
WO (1) WO2014086346A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015101723A1 (de) * 2015-02-06 2016-08-11 Franz-Holger Woitowitz Vorrichtung zur Montage eines Haltebügels an einem Ventiltriebelement
DE102016220396A1 (de) 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220397A1 (de) 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220399A1 (de) 2016-10-18 2017-09-07 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220401A1 (de) 2016-10-18 2017-09-07 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220394B3 (de) * 2016-10-18 2017-12-28 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016223088A1 (de) 2016-11-23 2018-05-24 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102022125608A1 (de) 2022-10-05 2024-04-11 Schaeffler Technologies AG & Co. KG Zwischenhebel

Family Cites Families (9)

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DE1925772A1 (de) * 1969-05-21 1970-11-26 Ford Werke Ag Kipp- und Schlepphebelfuehrung fuer Verbrennungsmotoren
US5657726A (en) * 1996-01-16 1997-08-19 Ford Global Technologies, Inc. Rocker arm assembly for an internal combustion engine
DE19730201A1 (de) * 1997-07-15 1999-01-21 Schaeffler Waelzlager Ohg Betätigungshebel für einen Ventiltrieb einer Brennkraftmaschine
DE10235402A1 (de) 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Schwenkhebel für einen hubvariablen Ventiltrieb
DE10260557A1 (de) * 2002-12-21 2004-07-01 Ina-Schaeffler Kg Zwischenhebel für einen variablen Ventiltrieb einer Brennkraftmaschine
JP2007170261A (ja) * 2005-12-21 2007-07-05 Otics Corp ロッカアーム
DE102006018512A1 (de) * 2006-04-21 2007-10-25 Schaeffler Kg Rollenelement für ein schwenkbewegliches Maschinenteil
DE102010009399A1 (de) * 2010-02-26 2011-09-01 Schaeffler Technologies Gmbh & Co. Kg Schwenkhebel für einen hubvariablen Gaswechselventiltrieb
DE102011003898B4 (de) 2011-02-10 2021-09-09 Schaeffler Technologies AG & Co. KG Zwischenhebel

Non-Patent Citations (1)

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Title
See references of WO2014086346A1 *

Also Published As

Publication number Publication date
CN104854317A (zh) 2015-08-19
WO2014086346A1 (fr) 2014-06-12
DE102012222374A1 (de) 2014-06-12

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