EP0962629A2 - Commande de soupape variable pour moteur à combustion interne - Google Patents

Commande de soupape variable pour moteur à combustion interne Download PDF

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Publication number
EP0962629A2
EP0962629A2 EP99107959A EP99107959A EP0962629A2 EP 0962629 A2 EP0962629 A2 EP 0962629A2 EP 99107959 A EP99107959 A EP 99107959A EP 99107959 A EP99107959 A EP 99107959A EP 0962629 A2 EP0962629 A2 EP 0962629A2
Authority
EP
European Patent Office
Prior art keywords
valve
rocker arm
roller
lift
cam
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
EP99107959A
Other languages
German (de)
English (en)
Other versions
EP0962629B1 (fr
EP0962629A3 (fr
Inventor
Gert Fischer
Michael Bidlingmaier
Stefan Föster
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0962629A2 publication Critical patent/EP0962629A2/fr
Publication of EP0962629A3 publication Critical patent/EP0962629A3/fr
Application granted granted Critical
Publication of EP0962629B1 publication Critical patent/EP0962629B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L13/0021—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 rocker arm ratio
    • 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 a preamble of claim 1 variable valve train for an internal combustion engine, in which a globe valve by a Control cam of a camshaft is actuated by means of a valve lever, which via a cam track arranged in its end region remote from the valve with interposition a controlled relocatable role cooperates with the control cam such that the transverse to the camshaft axis of rotation against and in the direction of rotation of the control cam discontinuously relocatable role of changing the opening and Combination times of the globe valve with constant opening angles in combination with variable valve strokes due to the change in the valve lever ratios due to the roller serves.
  • variable valve train with a rocker arm is for example from the EP 0 717 174 A1 is known.
  • this known valve train there are variable valve lifts achieved by changing the rocker gear ratio that matches the controlled change in the position of the roll from a position close to the tilting axis to a position away from the tilt axis along the cam track integrated on the rocker arm results.
  • this variable rocker arm ratio achieved via the roller system-related, there is also a relative change in the position of the role the control cam cooperating with it in such a way that with a rocker arm ratio in the direction of a small tilt angle, the roller used to have the opening flank comes into engagement and thus the opening and closing times of the The lift valve is adjusted to "early". This is connected between the respective Opening and closing times of the globe valve by dimensioning the Control cam given constant opening angle that at each of the achievable reduced valve strokes remains constant.
  • a disadvantage of this known valve train is that in order to achieve a desired one Gas dynamics in the combustion chamber of the internal combustion engine are kinematic Reasonably low valve strokes cannot be achieved and for others the valve opening angles remain constant.
  • the invention is based on the object, the generic valve train to improve that, especially in the low load range of the internal combustion engine especially small valve lifts with variably adjusted valve opening angles additionally achieved.
  • valve train With the valve train according to the invention it can be achieved that with one controlled under the fixedly positioned roller moving opening flank and closing flank of the control cam over the one evading by the shiftable tilt axis Valve lever initially no valve actuation and this is only given when the role only from about the beginning to the end of the cam tip of the control cam controlled the valve lever activated for valve actuation.
  • the advantage of the invention is that the additionally achievable variable valve opening angle ⁇ 120 ° crankshaft with variable valve strokes ⁇ 1.5 mm, in particular when using a rocker arm as a valve lever.
  • a rocker arm tiltable about its tilt axis with one arranged in a housing-fixed Bearing bridge connected along a straight path with stroke-guided lifting cylinders stands, with the end distal to the rocker arm by a prestressed spring acted upon lifting cylinders in a guide section of the predetermined stroke displacement elongated hole dimensioned according to the tilt axis for engaging a includes stop pin arranged in the bearing bridge, and further in this Guide section a recess is provided for engagement with play a shift pin that is used to release the against the spring between the ends the slot in the area of the cam tip of the control cam over the roller and the rocker arm, which is pivotable about the rocker arm support on the valve stem side, can be moved driven lifting cylinder is controllable.
  • the invention offers the advantage of a valve train with only one rocker arm, which in connection with the lifting cylinder compared to the known state of the Technology includes less moving masses.
  • valve train advantageously allows a configuration with a single camshaft with control cams for intake and exhaust lift valves, comprising one on a housing arranged rocker arm shaft mounted rocker arm for an outlet lift valve, being between the rocker arm shaft and the relative to this deeper in one Cylinder head arranged camshaft, the control shaft is provided for actuation the role between the inlet control cam and the rocker arm also controlled relocatable tilt axis for variable operation or control of the inlet lift valve preferably in the lower load range of the internal combustion engine, in particular in the low-load partial load range.
  • valve train can be used in a further advantageous manner in a combustion chamber Incoming air has a swirl movement for better mixture formation become.
  • variable valve train 1 for an internal combustion engine, not shown in detail is a lift valve 2, 2 'of a control cam 3 of a camshaft 4 actuated by means of a one-piece rocker arm 5, which in its valve path remote end region arranged cam 6 with interposition a controlled displaceable roller 7 cooperates with the control cam 3.
  • a lift valve 2, 2 'of a control cam 3 of a camshaft 4 actuated by means of a one-piece rocker arm 5, which in its valve path remote end region arranged cam 6 with interposition a controlled displaceable roller 7 cooperates with the control cam 3.
  • the transverse to the camshaft axis of rotation 8 against and in the direction of rotation of the control cam 3 discontinuously relocatable roller 7 is the change of opening and Closing times of the lift valve 2, 2 'at constant valve opening angles in combination with variable valve strokes due to the change in the roller-related Rocker arm ratios achieved, such as from the figure 3 upper lifting curve family emerges.
  • this valve train 1 should be improved such that, in particular especially small, variable at low load ranges of the internal combustion engine Valve strokes are achieved with variable valve opening angles.
  • the axis of rotation 8 is essentially parallel Tilt axis 9 of the rocker arm 5 relative to the camshaft 4 along a path 10 controlled in such a way dynamically displaceable that with shifted tilt axis 9 along the transverse to a connecting straight line 11 of the roller center 12 with the rocker arm rest 13 at the switching end of the lift valve 2, 2 'directed path 10 of the rocker arm 5 that only from about the beginning to the end of the cam tip 14 of the control cam 3 controlled roller 7 is activated for valve actuation.
  • variable valve train 1 further developed according to the invention is advantageous Way an additionally achievable variable valve opening angle ⁇ 120 ° crankshaft achieved with variable valve strokes ⁇ 1.5 mm, such as from Figure 3 is shown with the family of stroke curves near the abscissa.
  • a structurally advantageous design with a small amount of space with little Valve train masses is achieved in an embodiment of the invention in that the rocker arm 5 is tiltable about its tilt axis 9 with one in a housing-fixed arranged bearing bracket 15 along the straight path 10 stroke-guided lifting cylinders 16 is connected, the end distal to the rocker arm being pretensioned Spring 17 acted upon lifting cylinder 16 in a guide section the predetermined stroke displacement of the tilt axis 9 dimensioned accordingly
  • Elongated hole 18 for engaging a stop pin arranged in the bearing bracket 15 19 includes and also in this guide section a recess 20th is provided for engagement of a switching pin 21 with play.
  • the lifting cylinder 16 is advantageous acted upon by a bow spring 17 and to achieve a substantially noise-free Valve drive via a hydraulic valve lash compensation element or HVA 22 on a cooperating with the rocker arm 5 via cylindrical articular surfaces Articulated 23 supported.
  • a controllable acts for the controlled, dynamic displacement of the tilt axis 9 Actuating device 29, 29 'via an angle-adjustable switching shaft 30, 30' with a non-rotatable, resilient lever 31, 31 'on the respective Switching pin 21 driving, being in the phase of actuation of the globe valve 2, 2 'with switching bolts 21 blocked via the lifting cylinder 16 while at the same time being actuated Actuator 29, 29 'via the switching shaft 30, 30' of the spring-loaded Lever 31, 31 'is biased such that when the base circle phase is reached the roller 7 on the control cam 3 of the switching pin 21 from the recess 20 disengaged in the lifting cylinder 16 and in the disengaged position via the lever 31, 31 'is held.
  • the tilt axis 9 defined in the articulation block 23 of the rocker arm 5 can be corresponding the rotating control cam 3 between the ends of the elongated hole 18 can be moved in a lifting motion, with reaching the lower end of the Elongated hole 18, the free pivoting movement of the rocker arm 5 around its rocker arm rest 13 is ended at the shaft end of the lift valve 2, 2 'and thus the role 7 at the end of the opening flank from the start area to the end area of the Cam tip 14 of the control cam 3, the rocker arm 5 for actuating the lift valve 2, 2 'activated and then in the area of the closing flank with respect to a Valve stroke actuation is ineffective again.
  • the on the one hand with regard to the HVA 22 and on the other hand to the return spring, not shown of the associated lift valve 2, 2 ' is further proposed that the acting on the lifting cylinder 16 bow spring 17 at a short distance is arranged extending over the bearing bridge 15 and over an eyelet-like End section 32 on a lateral end face 33 of the bearing bracket 15 by means of a with the stop bolt 19 aligned screw 34 is attached, which also as a stop for a prestressed compression spring 35 for the bearing bracket 15 stop pin 19 arranged for sliding movement.
  • this can be on the inside be threaded to attack a disassembly screw (Not shown).
  • the roller 7 stands above both sides Handlebar 36 with a control arm 37 a motor via a worm gear 38 discontinuously drivable control shaft 39 in drive connection, each with the roller 7 cooperating control cam 3 to the cam tip 14 then and has a ramp-like section in front of the closing flank.
  • This ramp-like section brings about the axis of rotation relative to the camshaft 8 concentrically formed cam track 6 on the rocker arm 5 according to the figure 3 for each stroke curve of the upper curve family after the curve vertex a roof-like slope.
  • This roof-like course is over the ramp-like running section in connection with the rocker arm kinematics selected so that the valve opening angle of the family of lifting curves near the abscissa in the invention Way are preferably ⁇ 100 ° crankshaft.
  • a single valve drive serves to achieve an advantageously compact valve train 1
  • Control shaft 39 is provided for actuating the roller 7 between the inlet control cam 3 and the rocker arm 5 with controlled shiftable tilt axis 9 for variable operation or for variable control of the inlet lift valve 2, 2 '.
  • the compact arrangement described above is particularly advantageous if in the case of a cylinder head 44 with two intake lift valves 2, 2 'per combustion chamber, the associated Rocker arm 5 with displaceable tilt axis 9 each separately via the actuating devices 29, 29 'are arranged such that one of the Lift valves 2 'with a constant opening angle with respect to an inlet / outlet overlap and a valve stroke is variably controlled and that the other stroke valve 2 according to the invention with variable valve opening angle ⁇ 100 ° crankshaft Valve strokes ⁇ 1.1 mm are variably controlled. So that the internal combustion engine, not shown in the lower load range, especially in the partial load range close to idling are operated in a fuel-efficient manner by means of a targeted swirl formation Charge in a combustion chamber.
  • the tilt axis 9 can also be along a curved path be relocatable. Furthermore, both lift valves 2, 2 'for each of those shown in Figure 3 Curve family must be operated synchronously.
  • rocker arm can also be used as a valve lever within the scope of the invention Find.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP99107959A 1998-06-05 1999-04-22 Commande de soupape variable pour moteur à combustion interne Expired - Lifetime EP0962629B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19825308A DE19825308A1 (de) 1998-06-05 1998-06-05 Variabler Ventiltrieb für eine Brennkraftmaschine
DE19825308 1998-06-05

Publications (3)

Publication Number Publication Date
EP0962629A2 true EP0962629A2 (fr) 1999-12-08
EP0962629A3 EP0962629A3 (fr) 2000-10-18
EP0962629B1 EP0962629B1 (fr) 2004-06-30

Family

ID=7870111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99107959A Expired - Lifetime EP0962629B1 (fr) 1998-06-05 1999-04-22 Commande de soupape variable pour moteur à combustion interne

Country Status (4)

Country Link
US (1) US6145485A (fr)
EP (1) EP0962629B1 (fr)
DE (2) DE19825308A1 (fr)
ES (1) ES2221259T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10052811A1 (de) * 2000-10-25 2002-05-08 Ina Schaeffler Kg Variabler Ventiltrieb zur Laststeuerung einer fremdgezündeten Brennkraftmaschine

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19825307A1 (de) * 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Ventilsteuerung für eine Brennkraftmaschine
JP2001164911A (ja) 1999-12-10 2001-06-19 Yamaha Motor Co Ltd ４サイクルエンジンの動弁機構
DE10120451A1 (de) * 2001-04-26 2002-10-31 Ina Schaeffler Kg Elektromotorisch verdrehbare Welle
GR20010100295A (el) 2001-06-18 2003-02-27 Εμμανουηλ Παττακος Μεταβλητο συστημα βαλβιδων
DE10258277A1 (de) * 2002-12-13 2004-06-24 Mahle Ventiltrieb Gmbh Steuereinrichtung für Gaswechselventile eines Verbrennungsmotors
DE602004020508D1 (de) * 2003-08-18 2009-05-20 Manousos Pattakos Verstellbare ventilsteuerung
DE10341702A1 (de) * 2003-09-10 2005-04-28 Bayerische Motoren Werke Ag Ventiltrieb für eine Hubkolben-Brennkraftmaschine
US7418933B2 (en) * 2005-04-27 2008-09-02 Honda Motor Co., Ltd. Variable lift valve operating system for internal combustion engine
DE102005020586A1 (de) 2005-05-03 2006-11-09 Bayerische Motoren Werke Ag Ventiltrieb für eine Brennkraftmaschine
DE102006022481A1 (de) * 2006-05-13 2007-11-15 Bayerische Motoren Werke Ag Zylinderkopf für eine Brennkraftmaschine mit einem hubvariablen Ventiltrieb
DE102010051832B4 (de) 2010-11-18 2022-01-20 Volkswagen Aktiengesellschaft Verfahren zum Betreiben einer Hubkolben-Brennkraftmaschine mit Drallbrennverfahren

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0717174A1 (fr) 1994-12-12 1996-06-19 Isuzu Motors Limited Système de commande de soupape pour moteur à combustion interne

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221199A (en) * 1977-06-13 1980-09-09 Eaton Corporation Plural lash engine valve gear and device for selecting same
US4249488A (en) * 1978-09-14 1981-02-10 General Motors Corporation Valve lift adjusting device
FR2519375B1 (fr) * 1981-12-31 1986-07-11 Baguena Michel Distribution variable pour moteur a quatre temps
US4459946A (en) * 1982-05-17 1984-07-17 Investment Rarities, Incorporated Valve actuating apparatus utilizing a multi-profiled cam unit for controlling internal combustion engines
US4638773A (en) * 1986-02-28 1987-01-27 General Motors Corporation Variable valve lift/timing mechanism
US4911124A (en) * 1986-05-21 1990-03-27 Bennett Automotive Technology Pty., Ltd. Engines for use with gaseous fuels
EP0452671B1 (fr) * 1990-03-14 1995-06-14 Suzuki Kabushiki Kaisha Dispositif de commande de soupape pour moteur à quatre temps
US5732669A (en) * 1992-12-13 1998-03-31 Bayerische Motoren Werke Aktiengesellschaft Valve control for an internal combustion engine
DE4420064A1 (de) * 1994-06-08 1995-12-14 Bayerische Motoren Werke Ag Ventiltrieb mit variabler Steuerung der Ventilöffnungswinkel
DE19532334A1 (de) * 1995-09-01 1997-03-06 Bayerische Motoren Werke Ag Variabler Ventiltrieb, insbesondere für Brennkraftmaschinen
US5791306A (en) * 1997-08-13 1998-08-11 Caterpillar Inc. Internal combustion engine speed-throttle control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0717174A1 (fr) 1994-12-12 1996-06-19 Isuzu Motors Limited Système de commande de soupape pour moteur à combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10052811A1 (de) * 2000-10-25 2002-05-08 Ina Schaeffler Kg Variabler Ventiltrieb zur Laststeuerung einer fremdgezündeten Brennkraftmaschine
US6837198B2 (en) 2000-10-25 2005-01-04 Ina-Schaeffler Kg Variable valve distributor for load-controlling a spark-ignited internal combustion engine

Also Published As

Publication number Publication date
ES2221259T3 (es) 2004-12-16
DE19825308A1 (de) 1999-12-09
DE59909838D1 (de) 2004-08-05
EP0962629B1 (fr) 2004-06-30
EP0962629A3 (fr) 2000-10-18
US6145485A (en) 2000-11-14

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