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WO2012038190A1 - Moteur à combustion interne à quatre temps présentant un frein moteur - Google Patents

Moteur à combustion interne à quatre temps présentant un frein moteur Download PDF

Info

Publication number
WO2012038190A1
WO2012038190A1 PCT/EP2011/064722 EP2011064722W WO2012038190A1 WO 2012038190 A1 WO2012038190 A1 WO 2012038190A1 EP 2011064722 W EP2011064722 W EP 2011064722W WO 2012038190 A1 WO2012038190 A1 WO 2012038190A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever
valve
brake
cam
internal combustion
Prior art date
Application number
PCT/EP2011/064722
Other languages
German (de)
English (en)
Inventor
Gyula Toth
Michael Gröger
Original Assignee
Avl List Gmbh
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 Avl List Gmbh filed Critical Avl List Gmbh
Priority to EP11748679.5A priority Critical patent/EP2619422B1/fr
Publication of WO2012038190A1 publication Critical patent/WO2012038190A1/fr

Links

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
    • F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
    • 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
    • F01L2001/186—Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison

Definitions

  • the invention relates to a four-stroke internal combustion engine with an engine brake, with at least one actuated via a cam of a camshaft and at least a first valve lever assembly exhaust valve per cylinder, wherein the first valve lever assembly comprises a cam-side first lever arm and an outlet valve-side second lever arm, with a device for Pre-adjustment of the outlet control.
  • an internal engine brake valve in an internal combustion engine in addition to the exhaust valves, which is clocked during engine braking or constantly open.
  • Such engine brake valves are usually actuated hydraulically or pneumatically and are known, for example, from DE 44 23 657 C2, DE 38 39 452 C2, DE 38 39 450 C2, AT 004.387 Ul or AT 003.600 Ul. From DE 41 25 831 AI further motor braking device is known, the engine brake valve is electrically actuated.
  • known actuators for engine brake valves require a relatively high construction cost and require a comparatively large amount of space in the cylinder head, which can be difficult to provide in many cases.
  • an additional tank and a high-pressure oil system with a high-pressure pump and electro-hydraulic valves for each cylinder are usually required.
  • known motor brake device on a high number of items which increase the susceptibility to interference and adversely affect the manufacturing cost.
  • DE 39 36 808 A1 describes an exhaust cam-controlled engine brake for four-stroke internal combustion engines, in which the exhaust control is advanced by approximately one stroke, ie a crank angle of about 180 °, for the duration of the required braking action. This results in a doubling of the braking cycles and a decompression at the end of the compression stroke, whereby a higher retarding effect can be achieved.
  • US 6,000,374 A describes an engine brake for an internal combustion engine in which several braking phases can be realized per working cycle.
  • an additional brake rocker arm per cylinder is provided which - driven by a brake cam - actuates an exhaust valve. All rocker arms have a hydro element at their valve end. Solenoids can be used to influence which hydraulic elements are exposed to pressurized oil and which are not. This will achieve that in normal working operation, the brake rocker arm only runs empty and the exhaust valve is not operated via the brake rocker arm, because its hydro element without oil supply can not transmit the force.
  • the intake and exhaust rocker arms operate during operation as long as their hydro elements are filled with oil.
  • the object of the invention is to avoid these disadvantages and to allow for a four-stroke internal combustion engine in the simplest possible and space-saving manner doubled braking phases.
  • the first valve lever assembly comprises a switching member for adjusting the cam-side first lever arm between a working position and a braking position and that acts on the first lever arm of the first valve lever assembly cam actuated second valve lever assembly, preferably the second valve lever assembly a working lever and a brake lever wherein the working lever and brake lever are preferably pivotally mounted about the same axis and wherein the working lever acts only in the working position and the brake lever only in the braking position on the first lever arm of the first valve lever assembly.
  • Doubled braking phases can be made possible by the fact that the brake lever is actuated by an angle of about 90 ° out of phase before the working lever through the camshaft.
  • working and brake levers can be actuated by different cams. To save space, but it is particularly advantageous if the working and the brake lever from the same cam of the camshaft can be actuated. To ensure that both the working lever, and the brake lever are in constant contact with the camshaft, it can be provided that the working lever and the brake lever are pressed by preferably a spring against the camshaft, preferably the spring on the one hand on the working lever and on the other hand is supported on the brake lever.
  • the first lever arm has a lever element which can be adjusted by the switching element, wherein preferably the switching element is formed by a hydraulically actuatable actuator.
  • the switching element is formed by a hydraulically actuatable actuator.
  • the cam has at least one flanked by the base circle relief section having a smaller distance from the axis of rotation of the camshaft than the base circle, preferably the relief section diametrically to a lifting section of Cam is arranged.
  • the switching of the switching member causes, in the working position of the working lever and in the braking position of the brake lever acts on the first lever arm of the first valve lever assembly, while the other lever of the second valve lever assembly is exempted from the first valve lever assembly.
  • FIG. 1 shows an engine brake of an internal combustion engine according to the invention in an oblique view.
  • FIG. 2 shows the engine brake in a front view.
  • FIG. 3 shows the engine brake in the working position of a sectional view.
  • FIG. 10 is a valve lift diagram of the internal combustion engine in braking operation
  • 11 is another valve lift diagram of the internal combustion engine in
  • FIG. 12 shows a cam of an internal combustion engine according to the invention in an end view.
  • exhaust valves 1 of the internal combustion engine are actuated by a valve actuator 3 having a camshaft 2.
  • the valve actuating device 3 has an engine brake 4 with a first valve lever arrangement 5 and a second valve lever arrangement 6.
  • the first valve lever arrangement 5 is designed essentially as a rocker arm pivotable about a first axis 7 with a cam-side first lever arm 8 and an exhaust valve-side second lever arm 9.
  • the first lever arm 8 can be adjusted via a designed as a hydraulic actuator 11 switching member 10 with a between a normal working position A and a braking position B.
  • the first valve lever assembly 5 a lever member 12 which is pivotally mounted about a fixedly connected to the first valve lever assembly 5 axis 13 between the working position A and the braking position B, wherein the lever member 12 by a spring 14 in the direction of Working position A is biased.
  • the second lever arm 9 acts on a valve bridge 15 for actuating two exhaust valves 1 per cylinder.
  • the second valve lever assembly 6 consists of a working lever 16 and a brake lever 17 which are pivotally mounted about a common axis 22. By a spring 18 both levers 16, 17 are pressed by rollers 19, 20 to a common cam 21 of a camshaft 2.
  • the working lever 16 and the brake lever 17 are arranged relative to the first valve lever assembly 5 so that in the working position A of the working lever 16, and in the braking position B of the brake lever 17 acts on the lever member 12 of the first valve lever assembly 5.
  • the brake lever 17 is arranged with respect to the working lever 16 so that - viewed in the direction of rotation of the camshaft 2 - the contact point 17a of the brake lever 17 with the cam 21 by an angle ⁇ of about 90 ° in front of the contact point 16a of the working lever 16 with the cam 21 , This results in that the exhaust valves 1 in the braking position B by a crank angle of about 180 °, ie a work cycle, can be advanced.
  • Fig. 3 shows the engine brake 4 in a working position A, wherein the internal combustion engine is operated normally.
  • the lever member 12 In this working position A, the lever member 12 is held by the spring 14 in its upper position, the actuator 11 is deactivated, so switched without pressure.
  • the camshaft 2 with the cam 21 is driven in accordance with the arrow 23, wherein the lifting portion 21a of the cam 21 first raises the brake lever 17 and then the working lever 16, as shown in FIGS. 5 and 6.
  • this working position A of the brake lever 17 is exempt from the first valve lever assembly 5, which is why the operation of the brake lever 17 has no effect on the lifting movement of the exhaust valves 1.
  • Fig. 4 shows the engine brake 4 in its braking position B, wherein the cylinder chamber I Ia of the actuator 11 is acted upon by control pressure and the lever member 12 is moved to its braking position B shown in FIG.
  • this braking position B the working lever 16 of the second valve lever assembly 6 is exempted from the first valve lever assembly 5, while the brake lever 17 acts directly on the lever member 12 a.
  • the deflection of the brake lever 17 is transmitted via the lever element 12 of the first lever arm 8 of the first valve lever assembly 5 to the second lever arm 9, which opens the exhaust valves 1 via the valve bridge 15, as shown in FIGS. 7 and 8.
  • valve lift H is plotted against the crank angle KW for the normal working operation of the internal combustion engine, where I is the valve lift curve of the intake valves and E is the valve lift curve of the exhaust valves 1.
  • I is the valve lift curve of the intake valves
  • E is the valve lift curve of the exhaust valves 1.
  • ZOT is the top dead center of the ignition, with UT the bottom dead center and with OT the top dead center of the gas exchange designated.
  • the four strokes of the internal combustion engine - expansion, exhaust, intake, compression - are indicated by the reference Tl, T2, T3 and T4.
  • valve 10 shows a diagram in which the valve lift H for the braking operation is plotted against the crank angle KW.
  • the valve opening of the exhaust valves 1 is pre-adjusted by one operating stroke compared to the working operation, whereby now the exhaust valves 1 are opened in descending piston.
  • a throttling in the Ausschubphase is required.
  • phase designated Bl residual gas is emptied into the exhaust manifold. This is followed by a free intake from the exhaust manifold in B2.
  • B3 the gas is expelled from the cylinder space while throttling.
  • phase B4 residual gas is emptied into the inlet plenum. This is followed by a free intake from the inlet plenum in B5.
  • B6 the gas within the cylinder space is pushed out in B6.
  • BE is a mechanical discharge phase for a free adjustment called.
  • This mechanical relief phase BE is defined by a relief section 21c of the cam 21, which has a low Geren distance from the axis of rotation 2a of the camshaft 2, as the base circle 21b of the cam 21.
  • the relief portion 21c is located diametrically to the lifting portion 21a on the cam 21 and is flanked by two base circle portions 21b.
  • the regulation of the braking power can be done either via an adjustment of an exhaust flap in the exhaust pipe or via an adjustment of the exhaust valve E during the braking operation B.
  • a central stroke adjustment for all cylinder units is possible in that the control oil quantity fed into the cylinder chamber 11a of the actuator 11 is metered.
  • the cylinder chamber 11a is fed in each case by a central oil channel 24 in the axis 7 of the first valve lever arrangement 5. In this way, the lifting movement of the exhaust valve 1 can be adjusted during braking operation B in any intermediate positions El, E2, E3, E4, E5, as shown in FIG. 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un moteur à combustion interne à quatre temps présentant un frein moteur (4), comprenant au moins une soupape d'échappement (1) par cylindre, actionnée par une came (21) d'un arbre à cames (2) et au moins un premier ensemble culbuteur (5). Ce premier ensemble culbuteur (5) comprend un premier bras de culbuteur (8) côté came et un deuxième bras de culbuteur (9) côté soupape d'échappement. Un dispositif est prévu pour prérégler la commande de l'échappement (1). L'objectif de l'invention est de concevoir un frein moteur à phase de freinage double présentant une structure simple et peu encombrante. A cet effet, le premier ensemble culbuteur (5) comporte un organe de commutation (10) pour déplacer le premier bras de culbuteur (8) côté came entre une position de travail (A) et une position de freinage (B). En outre, un deuxième ensemble culbuteur (6) actionné par came est en contact avec le premier bras de culbuteur (8).
PCT/EP2011/064722 2010-09-23 2011-08-26 Moteur à combustion interne à quatre temps présentant un frein moteur WO2012038190A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11748679.5A EP2619422B1 (fr) 2010-09-23 2011-08-26 Moteur à combustion interne à quatre temps avec frein moteur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1582/2010 2010-09-23
AT15822010A AT510528B1 (de) 2010-09-23 2010-09-23 Viertakt-brennkraftmaschine mit einer motorbremse

Publications (1)

Publication Number Publication Date
WO2012038190A1 true WO2012038190A1 (fr) 2012-03-29

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ID=44511017

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PCT/EP2011/064722 WO2012038190A1 (fr) 2010-09-23 2011-08-26 Moteur à combustion interne à quatre temps présentant un frein moteur

Country Status (3)

Country Link
EP (1) EP2619422B1 (fr)
AT (1) AT510528B1 (fr)
WO (1) WO2012038190A1 (fr)

Cited By (3)

* 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
CN107060940A (zh) * 2017-06-07 2017-08-18 大连理工大学 一种多模式气门驱动系统
US20230107801A1 (en) * 2020-02-19 2023-04-06 Eaton Intelligent Power Limited Rocker arm assemblies

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE817834C (de) * 1947-11-08 1951-10-22 Austin Motor Co Ltd Nocken zur Steuerung des Ventils einer Brennkraftmaschine
DE3936808A1 (de) 1989-11-04 1990-08-02 Dietrich Gerhard Ellsaesser Auslassnockengesteuerte motorbremse fuer 4-taktmotoren
DE3839452C2 (fr) 1988-11-23 1991-03-07 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE3839450C2 (fr) 1988-11-23 1991-09-19 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE4125831A1 (de) 1991-08-03 1992-10-15 Daimler Benz Ag Motorbremse
DE4423657C2 (de) 1994-07-06 1997-10-02 Daimler Benz Ag Betätigungseinrichtung für ein Motorbremsventil einer Brennkraftmaschine
GB2323630A (en) * 1997-03-26 1998-09-30 T & N Technology Ltd Variable timing valve operating mechanism, eg for i.c. engines
US6000374A (en) 1997-12-23 1999-12-14 Diesel Engine Retarders, Inc. Multi-cycle, engine braking with positive power valve actuation control system and process for using the same
AT3600U1 (de) 1999-03-18 2000-05-25 Avl List Gmbh Viertakt-brennkraftmaschine mit einer motorbremse
DE19961795A1 (de) * 1998-12-24 2000-06-29 Unisia Jecs Corp Abgasbremse
AT4387U1 (de) 2000-09-12 2001-06-25 Avl List Gmbh Mehrzylinderbrennkraftmaschine mit einer motorbremseinrichtung
WO2003031778A1 (fr) * 2001-10-11 2003-04-17 Volvo Lastvagnar Ab Systeme de soupape d'echappement de moteurs a combustion interne
WO2003067067A1 (fr) * 2002-02-04 2003-08-14 Volvo Lastvagnar Ab Appareil destine a un moteur a combustion interne
WO2006090292A2 (fr) * 2005-01-12 2006-08-31 Eaton Corporation Longueur d'evenement de soupape double a bossage unique
WO2008073122A1 (fr) * 2006-12-12 2008-06-19 Mack Trucks, Inc. Dispositif d'ouverture de soupape et procédé
JP2009174319A (ja) * 2007-12-27 2009-08-06 Mitsubishi Fuso Truck & Bus Corp 内燃機関の可変動弁装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3701592B2 (ja) * 2001-09-14 2005-09-28 本田技研工業株式会社 減速休筒エンジン車両における故障検知装置
JP5108508B2 (ja) * 2004-05-06 2012-12-26 ジェイコブス ビークル システムズ、インコーポレイテッド エンジン弁作動のための主要及びオフセット・アクチュエータ・ロッカー・アーム

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE817834C (de) * 1947-11-08 1951-10-22 Austin Motor Co Ltd Nocken zur Steuerung des Ventils einer Brennkraftmaschine
DE3839452C2 (fr) 1988-11-23 1991-03-07 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE3839450C2 (fr) 1988-11-23 1991-09-19 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE3936808A1 (de) 1989-11-04 1990-08-02 Dietrich Gerhard Ellsaesser Auslassnockengesteuerte motorbremse fuer 4-taktmotoren
DE4125831A1 (de) 1991-08-03 1992-10-15 Daimler Benz Ag Motorbremse
DE4423657C2 (de) 1994-07-06 1997-10-02 Daimler Benz Ag Betätigungseinrichtung für ein Motorbremsventil einer Brennkraftmaschine
GB2323630A (en) * 1997-03-26 1998-09-30 T & N Technology Ltd Variable timing valve operating mechanism, eg for i.c. engines
US6000374A (en) 1997-12-23 1999-12-14 Diesel Engine Retarders, Inc. Multi-cycle, engine braking with positive power valve actuation control system and process for using the same
DE19961795A1 (de) * 1998-12-24 2000-06-29 Unisia Jecs Corp Abgasbremse
AT3600U1 (de) 1999-03-18 2000-05-25 Avl List Gmbh Viertakt-brennkraftmaschine mit einer motorbremse
AT4387U1 (de) 2000-09-12 2001-06-25 Avl List Gmbh Mehrzylinderbrennkraftmaschine mit einer motorbremseinrichtung
WO2003031778A1 (fr) * 2001-10-11 2003-04-17 Volvo Lastvagnar Ab Systeme de soupape d'echappement de moteurs a combustion interne
WO2003067067A1 (fr) * 2002-02-04 2003-08-14 Volvo Lastvagnar Ab Appareil destine a un moteur a combustion interne
WO2006090292A2 (fr) * 2005-01-12 2006-08-31 Eaton Corporation Longueur d'evenement de soupape double a bossage unique
WO2008073122A1 (fr) * 2006-12-12 2008-06-19 Mack Trucks, Inc. Dispositif d'ouverture de soupape et procédé
JP2009174319A (ja) * 2007-12-27 2009-08-06 Mitsubishi Fuso Truck & Bus Corp 内燃機関の可変動弁装置
US20100242878A1 (en) * 2007-12-27 2010-09-30 Mitsubishi Fuso Truck And Bus Corporation Variable valve apparatus for internal combustion engine

Cited By (4)

* 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
US10830159B2 (en) 2013-08-12 2020-11-10 Avl List Gmbh Valve-actuating device for varying the valve lift
CN107060940A (zh) * 2017-06-07 2017-08-18 大连理工大学 一种多模式气门驱动系统
US20230107801A1 (en) * 2020-02-19 2023-04-06 Eaton Intelligent Power Limited Rocker arm assemblies

Also Published As

Publication number Publication date
AT510528A1 (de) 2012-04-15
EP2619422B1 (fr) 2015-08-05
EP2619422A1 (fr) 2013-07-31
AT510528B1 (de) 2012-09-15

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