EP0678659A1 - Dispositif de commande de soupape pour moteur à combustion interne - Google Patents

Dispositif de commande de soupape pour moteur à combustion interne Download PDF

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Publication number
EP0678659A1
EP0678659A1 EP95103157A EP95103157A EP0678659A1 EP 0678659 A1 EP0678659 A1 EP 0678659A1 EP 95103157 A EP95103157 A EP 95103157A EP 95103157 A EP95103157 A EP 95103157A EP 0678659 A1 EP0678659 A1 EP 0678659A1
Authority
EP
European Patent Office
Prior art keywords
valve
rocker arm
cam
rocker
lever
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
EP95103157A
Other languages
German (de)
English (en)
Other versions
EP0678659B1 (fr
Inventor
Wilhelm Dr. Hannibal
Michael Paul
Peter Hübschle
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Publication of EP0678659A1 publication Critical patent/EP0678659A1/fr
Application granted granted Critical
Publication of EP0678659B1 publication Critical patent/EP0678659B1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves

Definitions

  • the invention relates to a valve actuation device for an internal combustion engine according to the preamble of claim 1.
  • the object of the invention is to provide a generic valve actuation device in which alignment of the bores in the first and second rocker arms is ensured in a simple manner when the valve is closed and the friction is reduced to a minimum.
  • the position of the first rocker arm relative to the second rocker arm can be easily adjusted by the first, adjustable stop such that the bores in these rocker arms when the valve is closed, exactly aligned with each other.
  • the second fixed stop on which the first rocker arm is supported when the valve is closed and the second rocker arm is also supported via the first stop, serves to prevent contact between the second rocker arm and the base area of the cam actuating this rocker arm. Thus, contact and friction between the second rocker arm and its cam only occur during the lifting phase. If the first rocker arm is also actuated by a cam, the second stop also prevents the first rocker arm from contacting the associated cam during the base circle phase.
  • a hydraulic valve lash compensation element is arranged between the first rocker arm and the valve, which prevents in a simple manner with certainty that the valve is accidentally opened slightly by setting the second stop. If this first rocker arm does not interact with its own cam, which is the case when the valve is switched off in the second operating mode, the second stop also prevents the hydraulic valve lash compensation element from being inflated.
  • the first rocker arm can be U-shaped and with its legs mounted on a common axis, while the second rocker arm is arranged between the legs on this axis.
  • the first rocker arm can be used to actuate two valves of the same type, one leg interacting with one valve.
  • a hydraulic valve lash compensation element is then preferably provided between each leg and the relevant valve.
  • valve actuation device can be designed so that the valve in the second operating mode is switched off, that is to say it is kept closed by its valve spring (in which case no separate cam cooperating with the first rocker arm is provided), and in the first operating mode is actuated in accordance with the contour of the cam acting on the second rocker arm.
  • a separate cam for the lower speed range can be provided for the second rocker arm for the second rocker arm for the second operating mode, while the cam interacting with the second rocker arm is designed for the upper speed rocker range and comes into effect for the first operating mode.
  • the device according to the invention can be used to actuate both one or more inlet valves and one or more outlet valves.
  • an actuating device for two intake or exhaust valves 1 of a cylinder of an internal combustion engine has a first U-shaped rocker arm 2 with two legs 3, which are pivotably mounted on an axis 5 defined in the cylinder head 4 and each act on a valve 1 via a hydraulic valve lash compensation element 6.
  • Each valve 1 is in the usual way under the action of a valve spring 7 which tends to hold the valve in its closed position.
  • a second rocker arm 8 is mounted on the axis 5, which cooperates with a cam 9 of a camshaft 10 and is pressed in the direction of the cam 9 by a spring 11.
  • the second rocker arm 8 there is a bore 12 which is radial to the pivot axis 5 and which, when the valves 1 are closed, is aligned with a bore 13 in the web 14 of the first rocker arm.
  • the bore 12 receives a coupling pin 15, which can be displaced outward by oil pressure against the action of a spring 16 in order to engage in the bore 13 in the web 14 of the first rocker arm 2.
  • the spring 16 is supported on the one hand on a collar 17 of a tube 18 connected to the coupling pin 15 and on the other hand on an insert 19 which is fixed in the bore 12 and is penetrated by the tube 18.
  • the insert 19 simultaneously forms a stop for the coupling pin 15 in its uncoupling position, shown in FIG. 3. Hydraulic fluid is supplied to the bore 12 through a longitudinal channel 20 in the axis 5 and a cutout 21 in the wall thereof when the coupling pin 15 is to be moved into its coupling position.
  • two operating modes are provided for the valves 1, namely a first operating mode, in which the rocker arm 2 is connected to the second rocker arm 8 by the outwardly displaced coupling bolt 15 and thereby the valves 1 corresponding to the contour of the cam 9 via the second rocker arm 8 are actuated, and a second operating mode, in which the coupling pin 15 is in the decoupling position shown in Figure 3 and the valves 1 are held by their springs 7 in their closed position, that is, are switched off.
  • the switchover from the second to the first operating mode must take place when the second rocker arm 8 corresponds to FIG. 3 in its rest position, that is not pivoted by its cam 9.
  • an adjustable stop is provided between the first and the second rocker arm, which is adjusted by an adjusting screw 22 is formed, which is screwed into a bridge 23 connecting the legs 3 of the first rocker arm 2 and against which an extension 24 of the second rocker arm 8 rests.
  • the legs 3 of the first rocker arm 2 are continued beyond the pivot axis 5 and are provided in these extensions 25 with adjusting screws 26 which are supported on a surface 27 on the cylinder head 4. With these adjusting screws 26, the rest position of the second rocker arm 8 can be adjusted so that there is no contact between it and the base circle portion of the cam 9. Since the second rocker arm 8 is pressed against the adjusting screw 22 by the spring 11, any rotation of the adjusting screws 26 which causes the first rocker arm 2 to pivot causes a corresponding pivoting of the second rocker arm 8. Since the second rocker arm 8 is thus only comes into contact with the cam elevation of the cam 9, the friction is reduced accordingly.
  • the first rocker arm 2 is in the second mode not stopped, but actuated in the lower speed range by own cams arranged on the camshaft 10, the adjusting screws 26 also prevent the first rocker arm 2 from coming into contact with the base circle sections of its cams.
  • a hydraulic valve lash compensation element 6 would be provided for each valve 1 in the first rocker arm 2, which, as in the exemplary embodiment shown, is supplied with pressure fluid through the longitudinal channel 20 in the pivot axis 5 and a bore 28 in the leg 3.
  • the rocker arms 2 and 8 can be inserted into the cylinder head as a structural unit preset by the first stop 22, so that only the second stop 26 then has to be set.

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)
EP19950103157 1994-03-24 1995-03-06 Dispositif de commande de soupape pour moteur à combustion interne Expired - Lifetime EP0678659B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4410288 1994-03-24
DE19944410288 DE4410288C1 (de) 1994-03-24 1994-03-24 Ventilbetätigungsvorrichtung für eine Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0678659A1 true EP0678659A1 (fr) 1995-10-25
EP0678659B1 EP0678659B1 (fr) 1997-10-22

Family

ID=6513774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950103157 Expired - Lifetime EP0678659B1 (fr) 1994-03-24 1995-03-06 Dispositif de commande de soupape pour moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0678659B1 (fr)
DE (1) DE4410288C1 (fr)
ES (1) ES2109746T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612551A1 (de) * 1996-03-29 1997-10-02 Schaeffler Waelzlager Kg Auf unterschiedliche Hübe für wenigstens ein Gaswechselventil umschaltbarer Ventiltrieb einer Brennkraftmaschine
US5655488A (en) * 1996-07-22 1997-08-12 Eaton Corporation Dual event valve control system
DE102004007766A1 (de) 2003-03-20 2004-09-30 Ina-Schaeffler Kg Schlepphebel eines Ventiltriebs einer Brennkraftmaschine
DE10318295A1 (de) * 2003-04-23 2004-11-11 Ina-Schaeffler Kg Schlepphebel eines Ventiltriebs einer Brennkraftmaschine
DE102004027054A1 (de) * 2004-06-03 2005-12-22 Ina-Schaeffler Kg Schaltbarer Schlepphebel eines Ventiltriebs einer Brennkraftmaschine
DE102006021933A1 (de) * 2006-05-11 2007-11-15 Schaeffler Kg Schlepphebeltrieb in einem Zylinderkopf einer Brennkraftmaschine
JP6458090B2 (ja) * 2017-06-30 2019-01-23 ヤマハ発動機株式会社 内燃機関および車両

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556025A (en) * 1983-11-18 1985-12-03 Mazda Motor Corporation Engine valve mechanism having valve disabling device
US4690110A (en) * 1985-04-26 1987-09-01 Mazda Motor Corporation Variable valve mechanism for internal combustion engines
EP0524664A2 (fr) * 1986-08-27 1993-01-27 Honda Giken Kogyo Kabushiki Kaisha Dispositif de commande de soupape dans un moteur à combustion interne
DE4321308C1 (de) * 1993-06-26 1994-07-21 Audi Ag Ventilbetätigungsvorrichtung für eine Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556025A (en) * 1983-11-18 1985-12-03 Mazda Motor Corporation Engine valve mechanism having valve disabling device
US4690110A (en) * 1985-04-26 1987-09-01 Mazda Motor Corporation Variable valve mechanism for internal combustion engines
EP0524664A2 (fr) * 1986-08-27 1993-01-27 Honda Giken Kogyo Kabushiki Kaisha Dispositif de commande de soupape dans un moteur à combustion interne
DE4321308C1 (de) * 1993-06-26 1994-07-21 Audi Ag Ventilbetätigungsvorrichtung für eine Brennkraftmaschine

Also Published As

Publication number Publication date
EP0678659B1 (fr) 1997-10-22
ES2109746T3 (es) 1998-01-16
DE4410288C1 (de) 1995-06-14

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