EP3947925B1 - Steuervorrichtung für das ventil eines verbrennungsmotors - Google Patents

Steuervorrichtung für das ventil eines verbrennungsmotors Download PDF

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Publication number
EP3947925B1
EP3947925B1 EP20723199.4A EP20723199A EP3947925B1 EP 3947925 B1 EP3947925 B1 EP 3947925B1 EP 20723199 A EP20723199 A EP 20723199A EP 3947925 B1 EP3947925 B1 EP 3947925B1
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EP
European Patent Office
Prior art keywords
valve
chamber
driving
piston
rocker arm
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.)
Active
Application number
EP20723199.4A
Other languages
English (en)
French (fr)
Other versions
EP3947925A1 (de
Inventor
Davide FERRARIO
Claudio Mondini
Francesco MEGA
Matteo Magni
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.)
Streparava SpA Con Socio Unico
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Streparava SpA Con Socio Unico
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Publication of EP3947925A1 publication Critical patent/EP3947925A1/de
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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
    • F01L1/12—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
    • F01L1/26—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
    • 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
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts
    • 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
    • F01L2013/10—Auxiliary actuators for variable valve timing
    • F01L2013/105—Hydraulic motors
    • 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

  • US 2016/281612 A1 discloses a valve-actuating device for varying the valve lift.
  • US 2019/0055861 A1 discloses a device for controlling at least one valve in an internal combustion engine.
  • the object of the present invention is to obtain a control device for controlling the valve of an internal-combustion engine which reduces the drawbacks of the prior art.
  • the rocker arm is hydraulically controlled to interrupt or not the kinematic chain that goes from the shaped shaft to the valve through the rocker arm.
  • the control device can selectively enable the reading of protrusions through the actuation duct in a simple and reliable way and reduce malfunctions. In other words, the control device can control whether the passage of the rocker arm over the protrusion has an effect or not on the valve through a hydraulic control.
  • the rocker arm comprises a first chamber, preferably a compensation chamber which houses part of a driving piston which in turn defines the position of the driving foot; a driving valve and a second chamber, preferably the second chamber is housed in the driving valve; the actuation duct is connected to the first chamber via the actuation valve; preferably the actuation valve is arranged between the first chamber and the actuation duct.
  • the driving piston is movable within the first cavity between a first position and a second position as a function of the pressure of the actuation duct; and when the driving piston is in the first position, it pushes the foot towards the valve.
  • the piston comprises an elongated element which extends from the third chamber to the second chamber passing through the opening, preferably the opening has a minimum diameter which is greater than the diameter of the elongated element so that a flow of liquid can flow between the opening and the elongated element from the second chamber to the third chamber and vice versa; preferably along the outer walls of the elongated element and the inner walls of the opening.
  • control device comprises another rocker arm configured to be coupled to a valve assembly comprising the valve.
  • Another object of the present invention is to obtain an engine-valvetrain assembly which reduces the drawbacks of the prior art.
  • an engine-valvetrain assembly comprising at least one valve of an internal-combustion engine and a control device of a valve according to any one of the claims 1 to 12 is obtained; the engine-valvetrain assembly comprising a shaped shaft coupled to the rocker arm.
  • the other valve is of the same type as the valve, consequently if the valve is an intake valve, the other valve is also an intake valve, if the valve is an exhaust valve, the other valve is also an exhaust valve.
  • the engine-valvetrain assembly comprises a single exhaust or intake valve for each rocker arm and the rocker arm is directly connected to the exhaust or intake valve without interposition of the bridge.
  • the driving piston 16 comprises a machined area which defines the housing seat 29 and which is located on the opposite side of the portion which abuts on the connecting element 4a.
  • the machined area comprises a recess 50 obtained inside a central body 51 of the driving piston 16, a blocking element 52 which is defined by a partial annular frame 53 which extends from the central body 51 of driving piston 16 and defines the recess 50, which has a partially annular shape, between the partial annular frame 53 and the central body 51.
  • the partial annular frame 53 comprises a partial annular side wall 54 and also a partial annular base wall 55.
  • valve 18 comprises a shutter guide 30; an elastic element 31 arranged between the shutter 25 and the shutter guide 30; an annular element 32 facing the shutter 25 from the side opposite the elastic element 31; a piston 33 having a main body 33a and an elongated element 33b; a protection element 34 of piston 33, in particular having a funnel shape; an elastic element 35 and a sleeve-shaped container element 36.

Landscapes

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

Claims (12)

  1. Steuervorrichtung zum Steuern des Ventils eines Verbrennungsmotors; wobei die Steuervorrichtung (3) aufweist:
    - einen Kipphebel (7), der um eine erste Achse (A1) drehbar gelagert ist und mit einer geformten Welle (5), insbesondere einer Nockenwelle, gekoppelt werden kann;
    - einen Antriebsfuß (15), der zum Einwirken auf das Ventil (2) konfiguriert ist;
    - eine in dem Kipphebel (7) untergebrachte Betätigungsvorrichtung (22, 23, 18, 16) zum selektiven Übertragen einer Bewegung zwischen der geformten Welle (5) und dem Ventil (2);
    - einen Antriebskanal (17), der mit der Betätigungsvorrichtung (22, 23, 18, 16) in Verbindung steht; wobei der Antriebskanal (17) zum hydraulischen Aktivieren oder Deaktivieren der Betätigungsvorrichtung (22, 23, 18, 16) konfiguriert ist, vorzugsweise ist das Ventil (2) ein Auslass- oder Einlassventil;
    wobei die Steuervorrichtung dadurch gekennzeichnet ist, dass:
    der Kipphebel (7) einen Antriebskolben (16) und eine erste Kammer (22), vorzugsweise eine Ausgleichskammer, die einen Teil des Antriebskolbens (16) aufnimmt, der wiederum die Position des Antriebsfußes (15) definiert; ein Antriebsventil (18); und eine zweite Kammer (23), wobei die zweite Kammer (23) vorzugsweise in dem Antriebsventil (18) untergebracht ist, aufweist, der Antriebskanal (17) über das Antriebsventil (18) mit der ersten Kammer (22) in Verbindung steht; das Antriebsventil zwischen der ersten Kammer (22) und dem Antriebskanal (17) angeordnet ist;
    wobei das Antriebsventil (18) eine dritte Kammer (42) aufweist, die mit der zweiten Kammer (23) über ein Schutzelement (34) in Verbindung steht, das zwischen der zweiten und der dritten Kammer (23, 42) angeordnet ist.
  2. Steuervorrichtung nach Anspruch 1, wobei die Betätigungsvorrichtung einen Antriebskolben (16) aufweist, der die Position des Antriebsfußes (15) definiert; insbesondere weist der Antriebskolben (16) den Antriebsfuß (15) auf; ist der Antriebskolben (16) in der ersten Kammer (22) beweglich, sodass der Abstand zwischen dem Antriebskolben (16) und dem Ventil (2) variieren kann; insbesondere ist der Antriebskolben (16) in Bezug auf den Körper (11) des Kipphebels (7) und entlang einer Achse verschiebbar, die parallel zu einer orthogonal zur ersten Achse (A1) verlaufenden Achse verläuft.
  3. Steuervorrichtung nach Anspruch 1, wobei der Antriebskolben (16) in Abhängigkeit vom Druck des Antriebskanals (17) im ersten Hohlraum (21) zwischen einer ersten Position und einer zweiten Position beweglich ist und der Fuß (15) in der ersten Position des Antriebskolbens (16) in Richtung des Ventils (2) gedrückt wird.
  4. Steuervorrichtung nach einem der vorstehenden Ansprüche, wobei das Antriebsventil (18) einen zwischen der zweiten Kammer (23) und der ersten Kammer (22) angeordneten Verschluss (25) und einen mit dem Verschluss (25) gekoppelten Kolben (33) zum Schieben des Verschlusses (25) in eine offene Position aufweist.
  5. Steuervorrichtung nach Anspruch 1, wobei das Schutzelement (34) eine Öffnung (34a) aufweist, die die zweite Kammer (23) mit der dritten Kammer (42) in Verbindung setzt.
  6. Steuervorrichtung nach Anspruch 5, wobei der Kolben (33) ein längliches Element (33b) aufweist, das sich von der dritten Kammer (42) durch die Öffnung (34a) des Schutzelements (34) hindurch zur zweiten Kammer (23) erstreckt, wobei die Öffnung (34a) vorzugsweise einen minimalen Durchmesser aufweist, der größer als der Durchmesser, vorzugsweise der maximale Durchmesser, des länglichen Elements (33b) ist, sodass ein Flüssigkeitsstrom zwischen der Öffnung (34a) und dem länglichen Element (33b) von der zweiten Kammer (23) zur dritten Kammer (42) und umgekehrt, vorzugsweise entlang der Außenwände des länglichen Elements und der Innenwände der Öffnung (34a) fließen kann.
  7. Steuervorrichtung nach Anspruch 5 oder Anspruch 6, wobei das Schutzelement (34) eine Trichterform mit einem Abschnitt mit einem minimalen Durchmesser und einem Abschnitt mit einem maximalen Durchmesser aufweist, und wobei der Abschnitt mit dem minimalen Durchmesser der zweiten Kammer (23) vorzugsweise dem Verschluss (25) zugewandt ist.
  8. Steuervorrichtung nach Anspruch 4, wobei das Betätigungsventil (18) ein erstes elastisches Element (35), das mit dem Kolben (33) gekoppelt ist, um den Kolben (32) entlang einer Ausrichtung (D) in einer ersten Richtung (V1) zu schieben, und ein zweites elastisches Element (31), das mit dem Verschluss (25) gekoppelt ist, um den Verschluss (25) entlang der Ausrichtung (D) in einer zweiten Richtung (V2) entgegengesetzt zur ersten Richtung (V1) zu schieben, aufweist, wobei die elastische Kraft des ersten elastischen Elements (35) größer als die elastische Kraft des zweiten elastischen Elements (31) ist.
  9. Steuervorrichtung nach einem der vorstehenden Ansprüche, aufweisend einen weiteren Kipphebel (6), der so konfiguriert ist, dass er mit einer das Ventil (2) aufweisenden Ventilanordnung (2) gekoppelt werden kann.
  10. Motor-Ventiltrieb-Anordnung mit mindestens einem Ventil (2) eines Verbrennungsmotors und einer Steuervorrichtung (3) eines Ventils (2) nach einem der vorstehenden Ansprüche, wobei der Motor-Ventiltrieb (1) eine geformte Welle (5) aufweist, die mit dem Kipphebel (7) gekoppelt ist, um über den Kipphebel (7) auf das Ventil (2) einzuwirken.
  11. Motor-Ventiltrieb-Anordnung nach Anspruch 10, aufweisend mindestens eine Ventilanordnung (2), die das Ventil (2) und ein weiteres Ventil (2) aufweist, und wobei der Kipphebel (7) mit dem Ventil (2) vorzugsweise so gekoppelt ist, dass er ausschließlich auf das Ventil (2) einwirkt; und der andere Kipphebel (6) über eine Brücke (4) mit der Ventilanordnung (2) gekoppelt ist, so dass er gleichzeitig auf beide Ventile (2) einwirkt.
  12. Motor-Ventiltrieb-Anordnung nach Anspruch 11, wobei die geformte Welle (5) einen ersten Nocken (9) mit mehreren Vorsprüngen (10) und einen zweiten Nocken mit einem Hauptnocken aufweist, der eine radiale Abmessung hat, die größer als jede radiale Abmessung der Vorsprünge (10) ist; und wobei der erste Nocken (9) mit dem Kipphebel (7) gekoppelt ist und der zweite Nocken mit dem anderen Kipphebel (6) gekoppelt ist.
EP20723199.4A 2019-04-03 2020-04-03 Steuervorrichtung für das ventil eines verbrennungsmotors Active EP3947925B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000005022A IT201900005022A1 (it) 2019-04-03 2019-04-03 Un dispositivo di controllo per la valvola di un motore a combustione interna
PCT/IB2020/053201 WO2020202094A1 (en) 2019-04-03 2020-04-03 A control device for the valve of an internal-combustion engine

Publications (2)

Publication Number Publication Date
EP3947925A1 EP3947925A1 (de) 2022-02-09
EP3947925B1 true EP3947925B1 (de) 2024-07-03

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Application Number Title Priority Date Filing Date
EP20723199.4A Active EP3947925B1 (de) 2019-04-03 2020-04-03 Steuervorrichtung für das ventil eines verbrennungsmotors

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EP (1) EP3947925B1 (de)
IT (1) IT201900005022A1 (de)
WO (1) WO2020202094A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE545489C2 (en) * 2020-12-18 2023-09-26 Gnutti Carlo Sweden Ab Rocker arm valve mechanism
DE102024109291A1 (de) * 2024-04-03 2025-10-09 Schaeffler Technologies AG & Co. KG Motorbremsvorrichtung für einen Ventiltrieb einer Brennkraftmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013215946A1 (de) * 2013-08-12 2015-02-12 Avl List Gmbh Ventilbetätigungseinrichtung zur Veränderung des Ventilhubs
CN110145382B (zh) * 2013-11-25 2021-08-13 Pac制动公司 压缩释放制动系统
KR20180008556A (ko) * 2015-05-18 2018-01-24 이턴 에스알엘 어큐뮬레이터로서 작동하는 오일 배출 밸브를 갖는 로커 암
EP3430246B1 (de) * 2016-03-14 2020-01-15 Volvo Truck Corporation Vorrichtung zur steuerung von mindestens einem ventil in einem verbrennungsmotor
DE112017002052T5 (de) * 2016-05-10 2019-01-03 Eaton Intelligent Power Limited Modularer kipphebel
DE102017104196A1 (de) * 2017-03-01 2018-09-06 Schaeffler Technologies AG & Co. KG Hydraulisches Abstützelement

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WO2020202094A1 (en) 2020-10-08
IT201900005022A1 (it) 2020-10-03
EP3947925A1 (de) 2022-02-09

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