EP2211030B1 - Variabler Ventilmechanismus - Google Patents

Variabler Ventilmechanismus Download PDF

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Publication number
EP2211030B1
EP2211030B1 EP09177705A EP09177705A EP2211030B1 EP 2211030 B1 EP2211030 B1 EP 2211030B1 EP 09177705 A EP09177705 A EP 09177705A EP 09177705 A EP09177705 A EP 09177705A EP 2211030 B1 EP2211030 B1 EP 2211030B1
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EP
European Patent Office
Prior art keywords
connecting pin
opening
closing amount
power transmission
valve
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
EP09177705A
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English (en)
French (fr)
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EP2211030A1 (de
Inventor
Koki Yamaguchi
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.)
Otics Corp
Original Assignee
Otics Corp
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Filing date
Publication date
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Publication of EP2211030A1 publication Critical patent/EP2211030A1/de
Application granted granted Critical
Publication of EP2211030B1 publication Critical patent/EP2211030B1/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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • F01L13/0026—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 by means of an eccentric
    • 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
    • F01L1/08—Shape of cams
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a variable valve mechanism that changes an opening and closing amount of a valve in accordance with an operating condition of an internal combustion engine.
  • Variable valve mechanisms such as a variable valve mechanism 90 as shown in FIG. 8 , include a drive shaft 91 provided rotatably, a drive cam 92 provided on the drive shaft 91, a power transmission mechanism 93 that transmits the power of the drive cam 92 to a valve 8 so as to open and close the valve 8; and an opening and closing amount variable mechanism 94 that displaces an intermediate portion of the power transmission mechanism 93 to change the opening and closing amount of the valve 8.
  • variable valve mechanism 90 the overall opening and closing amount of the valve 8 may be deviated from a desired opening and closing amount due to the deviation in dimensions of components and the like. Therefore, the engine performance may deteriorate.
  • a variable valve mechanism of the present invention includes a drive shaft provided rotatably, a drive cam provided on the drive shaft, a power transmission mechanism that transmits power from the drive cam to a valve to open and close the valve, and an opening and closing amount variable mechanism that displaces an intermediate portion of the power transmission mechanism to change an opening and closing amount of the valve.
  • the opening and closing amount variable mechanism includes a control shaft provided rotatably, a control cam provided on the control shaft and having a circular sectional shape whose center is eccentric with respect to an axial center of the control shaft, and a control arm that extends in a radial direction of the control cam, has a rear end portion rotatably externally attached to the control cam and a distal end portion provided with a plurality of pin holes to which the distance from the center of the control cam varies from each other, and swingably supports the intermediate portion of the power transmission mechanism in a circumferential direction of the control cam by selectively inserting one connecting pin provided to protrude or attached in the intermediate portion of the power transmission mechanism into one of the plurality of pin holes.
  • the variable valve mechanism is configured to adjust the opening and closing amount of the valve by changing a pin hole into which the connecting pin is inserted.
  • the connecting pin is detachably attached to a specific attachment position of the intermediate portion of the power transmission mechanism, and that the variable valve mechanism is configured to adjust the opening and closing amount of the valve by detaching the connecting pin from the attachment position, removing the connecting pin from the one of the plurality of pin holes, and inserting the connecting pin into another pin hole of the plurality of pin holes and reattaching the connecting pin to the attachment position without reassembling both the power transmission mechanism and the opening and closing amount variable mechanism.
  • the opening and closing amount of the valve can be adjusted by changing the pin hole into which the connecting pin is inserted.
  • a variable valve mechanism 9 according to the present embodiment as shown FIGS. 1 to 6B is provided for two intake valves or exhaust valves 8, 8 that are provided for a cylinder, and continuously changes an opening and closing amount L of the two valves 8, 8.
  • the variable mechanism 9 includes a drive shaft 10, a drive cam 20, a power transmission mechanism 30, an opening and closing amount variable mechanism 40, and rocker arms 50, 50 that will be described below.
  • the drive shaft 10 is a common shaft to a plurality of variable valve mechanisms 9 and rotates in accordance with the rotation of an internal combustion engine.
  • the drive cam 20 is provided on the drive shaft 10 and rotates together with the rotation of the drive shaft 10.
  • a sectional shape of the drive cam 20 is circular and the center A of the circular cross-section is eccentric with respect to an axial center Ao of the drive shaft 10.
  • the power transmission mechanism 30 changes a rotary motion of the drive cam 20 to a reciprocating motion and transmits the motion to the rocker arms 50, 50 to open and close the valves 8, 8 via the rocker arms 50, 50.
  • the power transmission mechanism 30 includes a drive arm 31, an input swing arm 32, a first lever 33, a second lever 34, and a pair of output swing cams 35, 35 that will be described below.
  • the drive arm 31 extends in a radial direction of the drive cam 20 and has a ring-shaped rear end portion that is rotatably externally attached to the drive cam 20 and a distal end portion that is rotatably attached to a rear end portion of the input swing arm 32 via a first connecting pin X1.
  • the input swing arm 32 has an intermediate portion in a longitudinal direction that is rotatably externally attached to a control shaft 41 (to be described later), and a distal end portion that is rotatably attached to a rear end portion of the first lever 33 via a second connecting pin X2.
  • the first lever 33 has a distal end portion that is rotatably attached to a rear end portion of the second lever 34 via a third connecting pin X3.
  • the second lever 34 has a distal end portion that is rotatably attached to rear end portions of the pair of output swing arms 35, 35 via a fourth connecting pin X4.
  • the pair of output swing arms 35, 35 have intermediate portions in a longitudinal direction that are rotatably externally attached to the control shaft 41, and distal end portions that are in contact with the rocker arms 50, 50.
  • the third connecting pin X3 has a distal end portion that protrudes from the first lever 33 and the second lever 34. The protrusion portion is supported by the opening and closing amount variable mechanism 40 so as to be displaceable in a circumferential direction.
  • the drive cam 20 rotates in accordance with the rotation of the drive shaft 10.
  • the power from the drive cam 20 is transmitted to the drive arm 31, the input swing arm 32, the first lever 33, the second lever 34, the pair of output swing arms 35, 35, the pair of rocker arms 50, 50, and the pair of valves 8, 8 in this order. Accordingly, the pair of valves 8, 8 reciprocate in the opening and closing direction of the valves by the opening and closing amount L.
  • the opening and closing amount variable mechanism 40 displaces the third connecting pin X3 in an intermediate portion of the power transmission mechanism 30 to change the opening and closing amount of the vales 8, 8.
  • the opening and closing amount variable mechanism 40 includes the control shaft 41, a control cam 42, and a control arm 43 that will be described below.
  • the control shaft 41 is provided in parallel to the drive shaft 10 and is rotationally driven by a rotating device (not shown).
  • the control cam 42 is provided on the control shaft 41 and rotates with the rotation of the control shaft 41.
  • a sectional shape of the control cam 42 is circular and the center B of the circular cross-section is eccentric with respect to an axial center Bo of the control shaft 41.
  • the control arm 43 extends in a radial direction of the control cam 42 and has a ring-shaped rear end portion that is rotatably externally attached to the control cam 42.
  • the control arm 43 has a distal end portion that is provided with a plurality of pin holes (e.g. three or more pin holes in the present embodiment) 44, 44.
  • the plurality of pin holes are arranged in a direction slightly displaced from circumferential directions R, R of a circle around the center B of the control cam 42. Therefore, the distance from the plurality of pin holes 44, 44 to the center B of the control cam 42 varies from each other.
  • the distal end portion of the control arm 43 is rotatably attached to the attachment portion between the distal end portion of the first lever 33 and the rear end portion of the second lever 34. Accordingly, the attachment portion is supported by the control arm 43 so as to be swingable in a circumferential direction of the control cam 42.
  • a stopper 45 is attached to the third connecting pin X3 to prevent the third connecting pin X3 from displacing in the longitudinal direction of the third connecting pin X3.
  • Each of the rocker arms 50, 50 is provided for each of the valves 8, 8.
  • Each rocker arm 50 has a rear end portion that is swingably supported by a lash adjuster 59 and a distal end portion that presses a stem end of the valve 8.
  • the rocker arm 50 is provided with a roller 51 at an intermediate portion in the longitudinal direction of the rocker arm.
  • the roller 51 contacts with an edge portion of the output swing arm 35.
  • Each valve 8 is provided with a valve spring (not shown) that closes the valve 8 following the displacement of the distal end portion of the rocker arm 50 in a direction away from the stem end of the valve 8.
  • the stopper 45 is detached from the third connecting pin X3, the third connecting pin X3 is detached from a specific attachment position in the attachment portion between the distal end portion of the first lever 33 and the rear end portion of the second lever 34 (shifted within a range in which the attachment is not detached), and is removed from the pin hole 44 into which the third connecting pin X3 was inserted.
  • the third connecting pin X3 is inserted into another pin hole 44 to which the distance from the center B of the control cam 42 is shorter than the distance from the center B to the pin hole 44 into which the third connecting pin X3 was inserted.
  • the third connecting pin X3 is returned to the specific attachment position, and the stopper 45 is reattached to the third connecting pin X3 so as to reattach the third connecting pin X3 to the specific position.
  • the attachment portion between the distal end portion of the first lever 33 and the rear portion of the second lever 34 is slightly shifted toward the center B of the control cam 42.
  • the output swing arm 35 is slightly shifted in one rotational direction around the axial center Bo of the control shaft 41, slightly decreasing the opening and closing amount of the valve 8.
  • the stopper 45 is detached from the third connecting pin X3, the third connecting pin X3 is detached from a specific attachment position in the attachment portion between the distal end portion of the first lever 33 and the rear end portion of the second lever 34 (shifted within a range in which the attachment is not detached), and is removed from the pin hole 44 into which the third connecting pin X3 was inserted.
  • the third connecting pin X3 is inserted into another pin hole 44 to which the distance from the center B of the control cam 42 is longer than the distance from the center B to the pin hole 44 into which the third connecting pin X3 was inserted.
  • the third connecting pin X3 is returned to the specific attachment position, and the stopper 45 is reattached to the third connecting pin X3 so as to reattach the third connecting pin X3 to the specific position.
  • the attachment portion between the distal end portion of the first lever 33 and the rear portion of the second lever 34 is slightly shifted away from the center B of the control cam 42.
  • the output swing arm 35 is slightly shifted in another rotational direction around the axial center Bo of the control shaft 41, slightly increasing the opening and closing amount of the valve 8.
  • the opening and closing amount of the valves 8, 8 can be easily adjusted by changing the pin hole 44 into which the connecting pin X3 is inserted without reassembling the components other than the connecting pin X3 (and the stopper 45). Therefore, the component accuracy can be reduced, improving the manufacturability.
  • the three or more pin holes 44, 44 enables multiple step adjustment and accurate adjustment.
  • the present invention is not limited to the above structure of the embodiment, and may be modified and realized within a range that does not depart from the scope of the invention.
  • variable valve mechanism 69 is provided that is substantially the same as the variable valve mechanism 9 according to the present embodiment but is different from the variable valve mechanism 9 in that the control arm 43 has only one pin hole 44 (that is, the variable valve mechanism 69 has no function to adjust the opening and closing amount).
  • the variable valve mechanisms 9 according to the present embodiment are provided.
  • the variable valve mechanisms 9 according to the present embodiment can adjust the opening and closing amount of the valves 8, 8 in accordance with the opening and closing amount of the valves 8, 8 of the variable valve mechanism 69. Therefore, the valve timing among the cylinders can be more accurately synchronized, improving the engine performance.
  • the present invention provides a variable valve mechanism includes a drive shaft, a drive cam, a power transmission mechanism that transmits power from the drive cam to a valve, and an opening and closing amount variable mechanism that displaces an intermediate portion of the power transmission mechanism to change an opening and closing amount of the valve.
  • the opening and closing amount variable mechanism includes a control shaft, a control cam, and a control arm that has a rear end portion rotatably externally attached to the control cam and a distal end portion provided with a plurality of pin holes to which the distance from the center of the control cam varies from each other, and swingably supports the intermediate portion of the power transmission mechanism in a circumferential direction of the control cam by selectively inserting one connecting pin provided to the intermediate portion of the power transmission mechanism into one of the plurality of pin holes.
  • the opening and closing amount of the valve is adjusted by changing a pin hole into which the connecting pin is inserted.

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

Claims (4)

  1. Variabler Ventilmechanismus, der eine drehbar vorgesehene Antriebswelle (10), einen Antriebsnocken (20), der an der Antriebswelle (10) vorgesehen ist, einen Kraftübertragungsmechanismus (30), der eine Kraft von dem Antriebsnocken (20) an ein Ventil (8) überträgt, um das Ventil (8) zu öffnen und zu schließen, und einen variablen Öffnungs-/ und Schließbetragsmechanismus (40) aufweist, der einen Zwischenabschnitt des Kraftübertragungsmechanismus (30) verschiebt, um einen Öffnungs-/ und Schließbetrag des Ventils (8) zu ändern, wobei der variable Öffnungs-/ und Schließbetragsmechanismus (40) Folgendes aufweist
    eine Steuerwelle (41), die drehbar vorgesehen ist,
    einen Steuernocken (42), der an der Steuerwelle (41) vorgesehen ist und eine kreisförmige Querschnittsform hat, deren Mitte (B) hinsichtlich einer axialen Mitte (Bo) der Steuerwelle (41) exzentrisch ist,
    dadurch gekennzeichnet, dass
    ein Steuerarm (43), der sich in einer radialen Richtung des Steuernockens (42) erstreckt, einen hinteren Endabschnitt, der außen an dem Steuernocken (42) drehbar befestigt ist, und einen distalen Endabschnitt aufweist, der mit einer Vielzahl von Stiftlöchern (44) versehen ist, zu denen der Abstand von der Mitte (B) des Steuernockens (42) voneinander variiert, und der den Zwischenabschnitt des Kraftübertragungsmechanismus (30) in einer Umfangsrichtung des Steuernockens (42) schwenkbar stützt durch wahlweises Einsetzen eines Verbindungsstifts (X3), der vorgesehen ist, um vorzuragen, oder der in dem Zwischenabschnitt des Kraftübertragungsmechanismus (30) befestigt ist, in eines von der Vielzahl von Stiftlöchern (44),
    wobei der variable Ventilmechanismus gestaltet ist, um den Öffnungs-/ und Schließbetrag des Ventils (8) durch ein Ändern eines Stiftlochs (44), in das der Verbindungsstift (X3) eingesetzt ist, einzustellen.
  2. Variabler Ventilmechanismus nach Anspruch 1, wobei der Verbindungsstift (X3) lösbar an einer spezifischen Befestigungsposition des Zwischenabschnitts des Kraftübertragungsmechanismus (30) befestigt ist, und
    wobei der variable Ventilmechanismus gestaltet ist, um den Öffnungs-/ und Schließbetrag des Ventils (8) durch Lösen des Verbindungsstifts (X3) von der Befestigungsposition, Entfernen des Verbindungsstifts (X3) von dem einen von der Vielzahl von Stiftlöchern (44) und Einsetzen des Verbindungsstifts (X3) in ein anderes Stiftloch (44) von der Vielzahl von Stiftlöchern (44) und Wiederbefestigen des Verbindungsstifts (X3) an der Befestigungsposition ohne ein Wiederzusammensetzen von dem Kraftübertragungsmechanismus (30) und dem variablen Öffnungs-/ und Schließbetragmechanismus (40) einzustellen.
  3. Variabler Ventilmechanismus nach Anspruch 1, wobei die Vielzahl von Stiftlöchern (44) in einer Richtung angeordnet ist, die von Umfangsrichtungen (R) eines Kreises um die Mitte (B) des Steuernockens (42) herum leicht versetzt ist.
  4. Variabler Ventilmechanismus nach Anspruch 1, wobei ein Anschlag (45) an dem Verbindungsstift (X3) befestigt ist, um den Verbindungsstift (X3) zu hindern, sich in der Längsrichtung des Verbindungsstifts (X3) zu verschieben.
EP09177705A 2009-01-23 2009-12-02 Variabler Ventilmechanismus Active EP2211030B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009012896A JP5334603B2 (ja) 2009-01-23 2009-01-23 可変動弁機構

Publications (2)

Publication Number Publication Date
EP2211030A1 EP2211030A1 (de) 2010-07-28
EP2211030B1 true EP2211030B1 (de) 2011-06-29

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EP09177705A Active EP2211030B1 (de) 2009-01-23 2009-12-02 Variabler Ventilmechanismus

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EP (1) EP2211030B1 (de)
JP (1) JP5334603B2 (de)
KR (1) KR101564738B1 (de)
AT (1) ATE514840T1 (de)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5041417Y2 (de) * 1971-02-03 1975-11-25
JPH0530876Y2 (de) * 1986-03-14 1993-08-06
JP2877219B2 (ja) * 1993-12-21 1999-03-31 生活協同組合ひろしま 可変エプロン式ピッキングラック
JP4050853B2 (ja) * 1999-10-25 2008-02-20 株式会社日立製作所 内燃機関の可変動弁装置
JP3873108B2 (ja) * 2003-10-14 2007-01-24 みのる産業株式会社 薬液注入機
JP4269924B2 (ja) * 2003-12-12 2009-05-27 日産自動車株式会社 内燃機関のバルブリフト量調整方法および調整機構
WO2005059321A1 (en) * 2003-12-18 2005-06-30 Toyota Jidosha Kabushiki Kaisha Variable valve mechanism
JP4412190B2 (ja) * 2004-04-28 2010-02-10 トヨタ自動車株式会社 可変動弁機構
JP4295171B2 (ja) * 2004-07-20 2009-07-15 株式会社日立製作所 内燃機関の動弁装置
JP4096938B2 (ja) * 2004-11-17 2008-06-04 日産自動車株式会社 動弁機構のリフト調整装置及びリフト調整方法
JP2007170333A (ja) * 2005-12-26 2007-07-05 Otics Corp 可変動弁機構
KR100868209B1 (ko) * 2006-11-16 2008-11-11 현대자동차주식회사 연속 가변 밸브 리프트 장치
JP4415042B2 (ja) * 2007-10-18 2010-02-17 日立オートモティブシステムズ株式会社 内燃機関の可変動弁装置
JP5313644B2 (ja) * 2008-11-26 2013-10-09 株式会社オティックス 可変動弁機構

Also Published As

Publication number Publication date
KR101564738B1 (ko) 2015-10-30
ATE514840T1 (de) 2011-07-15
JP2010169016A (ja) 2010-08-05
EP2211030A1 (de) 2010-07-28
KR20100086927A (ko) 2010-08-02
JP5334603B2 (ja) 2013-11-06

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