EP2386729A1 - Mehrzylinder-Verbrennungsmotor mit variablem Antrieb der Motorventile - Google Patents

Mehrzylinder-Verbrennungsmotor mit variablem Antrieb der Motorventile Download PDF

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Publication number
EP2386729A1
EP2386729A1 EP10425154A EP10425154A EP2386729A1 EP 2386729 A1 EP2386729 A1 EP 2386729A1 EP 10425154 A EP10425154 A EP 10425154A EP 10425154 A EP10425154 A EP 10425154A EP 2386729 A1 EP2386729 A1 EP 2386729A1
Authority
EP
European Patent Office
Prior art keywords
engine
actuator means
abovementioned
valves
rocker arms
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Withdrawn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
EP10425154A
Other languages
English (en)
French (fr)
Inventor
Clino D'Epiro
Antonio Balzano
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.)
Fiat Powertrain Technologies SpA
Original Assignee
Fiat Powertrain Technologies SpA
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 Fiat Powertrain Technologies SpA filed Critical Fiat Powertrain Technologies SpA
Priority to EP10425154A priority Critical patent/EP2386729A1/de
Priority to PCT/IB2011/051645 priority patent/WO2011141833A2/en
Priority to US13/697,184 priority patent/US20130055973A1/en
Publication of EP2386729A1 publication Critical patent/EP2386729A1/de
Withdrawn legal-status Critical Current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
    • F01L1/12—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
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • 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
    • 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

Definitions

  • the present invention refers to multi-cylinder internal combustion engines of the type indicated in the preamble of the attached claim 1. Engines of this type are illustrated in documents EP 0 543 210 B1 , EP 1 927 734 A2 and EP 1 927 735 A1 .
  • Compression braking systems for internal combustion engines in particular for reciprocating engines such as diesel engines for heavy duty vehicles, are known.
  • compression braking allows attaining extremely high specific braking powers, especially simultaneously with a supercharging performed by means of turbochargers with variable geometry.
  • Figure 1 of the attached drawings shows the solution known from EP 0 543 210 B1 .
  • number 1 is used to -generally designate a multi-cylinder internal combustion engine, in particular a turbocharged diesel engine, comprising - for each cylinder - a combustion chamber (not shown in the drawing) with at least one intake conduit (also not shown in the drawing) and at least one exhaust conduit (the illustrated example shows two exhaust conduits 9 converging into an exhaust manifold 10).
  • exhaust valves 3 biassed by respective springs 13 towards an upper (with reference to the drawing) closed position of the respective conduits.
  • the engine further comprises, still according to the conventional art, at least one camshaft with cams 36 for controlling the valves, which for example can be a single camshaft intended to control both the intake valves and the exhaust valves.
  • Each exhaust valve 3 of each engine cylinder is displaceable towards a lowered (with reference to figure 1 ) position for opening the respective exhaust conduit, against the action of the respective spring 13, by a rocker arm 18 rotatably mounted around a rotation axis O on the structure of the engine.
  • the rocker arm 18 has one end freely rotatably supporting a roller 27 which cooperates with a respective cam 36 of the camshaft.
  • the other end of the rocker arm controls the displacement of the two exhaust valves 3 associated to each cylinder, by means of a bridge-like structure (naturally a single exhaust valve for each cylinder may obviously be provided which is controlled directly by the end of the respective rocker arm).
  • the cam 36 has a main lobe 58 to obtain the lifting of the exhaust valves during the exhaust stage of the operating cycle of the respective cylinder, a zero lift portion 56, which does not determine any lift of the exhaust valves, and a portion 57 slightly lifted with respect to the circular base profile for attaining a slight extra lift of the exhaust valves during the compression stage in the respective cylinder, which extra lift is actuated - simultaneously with an interruption of fuel supply to the combustion chamber - when an engine braking effect is requested.
  • the rocker arm 18 is rotatably mounted on a fixed axle onto the structure of the engine with the interposition of an eccentric bushing 39 whose angular position around the support axis may be varied. In the specific case of the illustrated example, this is done through a fluid actuator 46, also illustrated in figure 1 , which operates on a lever 45 connected in rotation with the bushing 39.
  • the variation of the angular position of the bushing 39 determines a variation of the position of the rotation axis of the rocker arm 18 with respect to the structure of the engine.
  • the position of the rotation axis of the rocker arm is selected in such a manner that the arm 18 is unaffected, due to the existing clearance, by the portion 57 of the profile of the cam 36, thus the extra-lift of the exhaust valves is not activated during the cylinder compression stage.
  • the supply of fuel to the cylinders is cut off and the eccentric bushings 39 of the various rocker members are rotated in such a manner that the latter "feel" the profile 57 and cause the abovementioned extra-lift.
  • the object of the present invention is that of proposing a device of the aforedescribed type capable of allowing a dramatic simplification of the device itself with respect to those proposed previously and an ensuing dramatic reduction of the production costs.
  • the invention provides for, equivalently to the prior art solution described above, that the rocker arms associated to the valves (in particular to the exhaust valves) of the various cylinders of the engine be rotatably supported by interposing eccentric bushings, which may be rotated to vary the position of the rotational axis of the rocker arms.
  • eccentric bushings are not rotatably mounted each on a respective fixed axle, but rather they are connected in rotation on a common shaft which is rotatably supported by the structure of the engine.
  • the adjustment of the angular position of all the eccentric bushings associated to the various cylinders of the engine may be obtained simultaneously, through actuator means of any type suitable to rotate the abovementioned common shaft to which the eccentric bushings are connected in rotation.
  • a hydraulically controlled actuator device may be provided of a type similar to conventional devices used for adjusting the camshaft phase, comprising a rotor connected in rotation with the shaft supporting the eccentric bushings, and a stator fixed onto the structure of the engine and surrounding the rotor, with hydraulic means for the variation of the angular position of the rotor with respect to the stator.
  • actuators of any other type such as hydraulic, electric or pneumatic actuators, or also a transmission between the actuator means and the driven shaft, to increase the transmitted torque, for example a crank connected to the shaft supporting the eccentric bushings and actuated by a fluid linear actuator, or a gear transmission.
  • the embodiment visible in the drawings shows that the shaft 100 is rotatably supported by the structure of the engine within respective seats 102 which are defined partly by supports 103 forming part of the structure of the cylinder head of the engine and partly by caps 104 (only one of which is visible in the drawings) fixed by means of screws 104a ( figure 3 ) to the supports 103.
  • Preferably low friction support bearings are provided in the seats in which the shaft 100 is mounted.
  • the device according to the invention enables simultaneous adjustment of the angular position of all the eccentric bushings 39, in order to obtain the activation and deactivation of the extra-lift of the exhaust valves which has been discussed above with reference to figure 1 , by simply controlling a rotation of the common shaft 100 to which the eccentric bushings 39 are fixed.
  • the actuator means used for controlling the rotation of the shaft 100 may be of any type.
  • a hydraulically controlled actuator is procided of a type similar to that used conventionally used for adjusting the camshaft phase.
  • the actuator generally designated by reference number 105, comprises a rotor 106 with blades 106a which is connected in rotation with the shaft 100 and rotates within a circular stator 107 with internal blades 107a.
  • rotor 106 and stator 107 defined between the rotor 106 and stator 107 are hydraulic chambers which are selectively connected to a supply pump 108 and a reservoir 109 through a control valve 110, in such a manner to control the adjustment of the angular position of the shaft 100 and hence of the eccentric bushings 39.
  • the device according to the invention allows using one actuator for simultaneously controlling the adjusting of the position of the rocker members 18 controlling the exhaust valves of the engine cylinders. Not only is the device extremely simple and inexpensive to manufacture but it also allows a considerable reduction of the number of components with respect to the solutions proposed previously.
  • the device according to the invention also allows easily positioning the actuator device even outside the engine, with the ensuing advantages even in terms of reducing the temperature and vibrations to which the actuator is subjected and thus also avoiding any restrictions regarding the dimensions of the actuator and/or the type of actuator one intends to use.
  • the means for actuating the rotation of the shaft 100 for supporting the eccentric bushings 39 may be of any type, and in particular they may be of pneumatic type, hydraulic type or electric type.
  • the device according to the invention would be identically applicable even to distribution systems using a different kinematic chain for controlling the valves, with levers of a different type with respect to the rocker arms indicated herein. Therefore, in the claims that follow, the term “rocker arm” shall be considered to include the case of any lever having a rotational movement around one axis.
  • actuator means could be made up of a linear hydraulic actuator connected to a crank lever connected to the shaft 100.
  • a mechanical transmission (for example a linkage or a gearing) may be generally interposed to increase the torque transmitted to the shaft 100.
  • eccentric bushings 39 may be each formed in a single piece or also in several pieces connected to each other. Furthermore, should the rocker arms that control the intake valves be mounted on the same rotational axis of the rocker arms which control the exhaust valves, the intake rocker arms may be freely rotatatably mounted on the abovementioned common support shaft 100, in such a manner to be unaffected by the rotations of the latter.
  • the invention is obviously also theoretically applicable to devices for actuating the intake valves of the engine, in any desired case in which, for any reason, it is required to activate or de-activate an extra-lift of the intake valves through simple and inexpensive means.
  • the device is also applicable in any other case in which one desires to obtain an extra-lift of the exhaust valves, to obtain effects different from that of compression braking.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP10425154A 2010-05-10 2010-05-10 Mehrzylinder-Verbrennungsmotor mit variablem Antrieb der Motorventile Withdrawn EP2386729A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10425154A EP2386729A1 (de) 2010-05-10 2010-05-10 Mehrzylinder-Verbrennungsmotor mit variablem Antrieb der Motorventile
PCT/IB2011/051645 WO2011141833A2 (en) 2010-05-10 2011-04-15 Multi-cylinder internal combustion engine with variable actuation of the engine valves
US13/697,184 US20130055973A1 (en) 2010-05-10 2011-04-15 Multi-cylinder internal combustion engine with variable actuation of the engine valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10425154A EP2386729A1 (de) 2010-05-10 2010-05-10 Mehrzylinder-Verbrennungsmotor mit variablem Antrieb der Motorventile

Publications (1)

Publication Number Publication Date
EP2386729A1 true EP2386729A1 (de) 2011-11-16

Family

ID=43064512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10425154A Withdrawn EP2386729A1 (de) 2010-05-10 2010-05-10 Mehrzylinder-Verbrennungsmotor mit variablem Antrieb der Motorventile

Country Status (3)

Country Link
US (1) US20130055973A1 (de)
EP (1) EP2386729A1 (de)
WO (1) WO2011141833A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015070949A1 (de) * 2013-11-13 2015-05-21 Daimler Ag Motorbremsvorrichtung für eine brennkraftmaschine
CN106968746A (zh) * 2015-10-05 2017-07-21 现代凯菲克株式会杜 控制电子连续可变气门正时的设备和方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6831207B2 (ja) * 2016-10-20 2021-02-17 三菱重工エンジン＆ターボチャージャ株式会社 ロッカーアーム
DE202017103459U1 (de) * 2017-06-08 2018-09-13 steute Schaltgeräte GmbH & Co. KG Funksensormodul zur Detektion von Materialbehältern

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE348023C (de) * 1919-05-04 1922-02-01 Ernst Muschinsky Vorrichtung zur Regelung des Hubes der Gemischeinlassventile von mehrzylindrigen Verbrennungskraftmaschinen
EP0450332A1 (de) * 1990-03-08 1991-10-09 Suzuki Kabushiki Kaisha Ventilantriebsvorrichtung für Viertaktbrennkraftmaschine
EP0543210A1 (de) * 1991-11-08 1993-05-26 IVECO FIAT S.p.A. Brennkraftmaschine mit einer kontinuierliche Bremsvorrichtung, insbesondere für Nutzfahrzeuge
US5655499A (en) * 1995-06-15 1997-08-12 Unisia Jecs Corporation Decompression braking apparatus for diesel engine
DE19807351A1 (de) * 1997-02-28 1998-09-03 Avl List Gmbh Brennkraftmaschine mit innerer Verbrennung
GB2323630A (en) * 1997-03-26 1998-09-30 T & N Technology Ltd Variable timing valve operating mechanism, eg for i.c. engines
EP1347154A2 (de) * 2002-03-20 2003-09-24 Hydraulik-Ring Gmbh Ventilsteuerung zur Einstellung des Hubes von Ventilen in einer Brennkraftmaschine
DE10352677A1 (de) * 2003-11-03 2005-06-02 Hydraulik-Ring Gmbh Aktuatorik für Verbrennungsmotoren mit einer variablen Ventilsteuerung
US20050279304A1 (en) * 2004-06-16 2005-12-22 Hitachi, Ltd. Variable valve system of internal combustion engine and method of assembling same
DE102005062207A1 (de) * 2005-12-24 2007-06-28 Mahle International Gmbh Nockenwelle
EP1927735A1 (de) 2006-11-28 2008-06-04 Iveco S.p.A. Dekompressionsbremsvorrichtung für Brennkraftmaschinen
EP1927734A2 (de) 2006-11-28 2008-06-04 Iveco S.p.A. Verbrennungsmotor mit Ventilöffnungsvariationssystem und mit einem solchen Motor ausgestattetes Fahrzeug

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1812787A (en) * 1929-06-05 1931-06-30 Ora M Doolittle Braking attachment for vehicle motors
US2772667A (en) * 1950-01-13 1956-12-04 Daimler Benz Ag Valve-control
GB782351A (en) * 1952-10-09 1957-09-04 Clarence Arnold Fell Improvements in or relating to internal combustion engine assemblies
GB1279977A (en) * 1968-12-14 1972-06-28 Vauxhall Motors Ltd Internal combustion engine valve actuator mechanism
JP2700692B2 (ja) * 1989-06-30 1998-01-21 スズキ株式会社 ４サイクルエンジンの動弁装置
JP3828774B2 (ja) * 2001-10-01 2006-10-04 日野自動車株式会社 デコンプレッション装置
JP4254582B2 (ja) * 2004-03-12 2009-04-15 日産自動車株式会社 内燃機関のバルブリフト量調整機構および調整方法
JP4545127B2 (ja) * 2006-09-15 2010-09-15 株式会社デンソー バルブタイミング調整装置

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE348023C (de) * 1919-05-04 1922-02-01 Ernst Muschinsky Vorrichtung zur Regelung des Hubes der Gemischeinlassventile von mehrzylindrigen Verbrennungskraftmaschinen
EP0450332A1 (de) * 1990-03-08 1991-10-09 Suzuki Kabushiki Kaisha Ventilantriebsvorrichtung für Viertaktbrennkraftmaschine
EP0543210A1 (de) * 1991-11-08 1993-05-26 IVECO FIAT S.p.A. Brennkraftmaschine mit einer kontinuierliche Bremsvorrichtung, insbesondere für Nutzfahrzeuge
EP0543210B1 (de) 1991-11-08 1997-05-02 IVECO FIAT S.p.A. Brennkraftmaschine mit einer kontinuierlichen Bremsvorrichtung, insbesondere für Nutzfahrzeuge
US5655499A (en) * 1995-06-15 1997-08-12 Unisia Jecs Corporation Decompression braking apparatus for diesel engine
DE19807351A1 (de) * 1997-02-28 1998-09-03 Avl List Gmbh Brennkraftmaschine mit innerer Verbrennung
GB2323630A (en) * 1997-03-26 1998-09-30 T & N Technology Ltd Variable timing valve operating mechanism, eg for i.c. engines
EP1347154A2 (de) * 2002-03-20 2003-09-24 Hydraulik-Ring Gmbh Ventilsteuerung zur Einstellung des Hubes von Ventilen in einer Brennkraftmaschine
DE10352677A1 (de) * 2003-11-03 2005-06-02 Hydraulik-Ring Gmbh Aktuatorik für Verbrennungsmotoren mit einer variablen Ventilsteuerung
US20050279304A1 (en) * 2004-06-16 2005-12-22 Hitachi, Ltd. Variable valve system of internal combustion engine and method of assembling same
DE102005062207A1 (de) * 2005-12-24 2007-06-28 Mahle International Gmbh Nockenwelle
EP1927735A1 (de) 2006-11-28 2008-06-04 Iveco S.p.A. Dekompressionsbremsvorrichtung für Brennkraftmaschinen
EP1927734A2 (de) 2006-11-28 2008-06-04 Iveco S.p.A. Verbrennungsmotor mit Ventilöffnungsvariationssystem und mit einem solchen Motor ausgestattetes Fahrzeug

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015070949A1 (de) * 2013-11-13 2015-05-21 Daimler Ag Motorbremsvorrichtung für eine brennkraftmaschine
US9874123B2 (en) 2013-11-13 2018-01-23 Daimler Ag Engine compression brake device for an internal combustion engine
CN106968746A (zh) * 2015-10-05 2017-07-21 现代凯菲克株式会杜 控制电子连续可变气门正时的设备和方法
US10190449B2 (en) 2015-10-05 2019-01-29 Hyundai Kefico Corporation Apparatus and method of controlling electronic continuously variable valve timing

Also Published As

Publication number Publication date
US20130055973A1 (en) 2013-03-07
WO2011141833A2 (en) 2011-11-17
WO2011141833A3 (en) 2012-01-05

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