EP3181839A1 - Dispositif de décompression pour un moteur à combustion interne à pistons alternatifs - Google Patents

Dispositif de décompression pour un moteur à combustion interne à pistons alternatifs Download PDF

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Publication number
EP3181839A1
EP3181839A1 EP16198838.1A EP16198838A EP3181839A1 EP 3181839 A1 EP3181839 A1 EP 3181839A1 EP 16198838 A EP16198838 A EP 16198838A EP 3181839 A1 EP3181839 A1 EP 3181839A1
Authority
EP
European Patent Office
Prior art keywords
cam
internal combustion
combustion engine
support element
pressure medium
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
EP16198838.1A
Other languages
German (de)
English (en)
Other versions
EP3181839B1 (fr
Inventor
Wilfried Barth
Thomas EIDENBÖCK
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3181839A1 publication Critical patent/EP3181839A1/fr
Application granted granted Critical
Publication of EP3181839B1 publication Critical patent/EP3181839B1/fr
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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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L1/185—Overhead end-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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • 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
    • 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
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L2001/2444—Details relating to the hydraulic feeding circuit, e.g. lifter oil manifold assembly [LOMA]
    • 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
    • F01L2760/00—Control of valve gear to facilitate reversing, starting, braking of four stroke engines
    • F01L2760/001—Control of valve gear to facilitate reversing, starting, braking of four stroke engines for starting four stroke engines
    • 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
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/01—Starting

Definitions

  • the invention relates to a decompression device for a reciprocating internal combustion engine having the features of the preamble of patent claim 1.
  • the decompression lever actuates the decompression valve in the cylinder head, especially in the case of single-cylinder two-stroke engines, or opens one or more gas exchange exhaust valves in four-stroke engines.
  • the decompression lever is also referred to as a valve release lever.
  • Such decompression devices are mainly used on single-cylinder internal combustion engines older motorcycles or mopeds, isolated in older cars or tractors, usually with single-cylinder engines. But also in modern lawnmower motors, stationary engines and hand-held engine work tools such. B. chainsaws decompression devices are often used.
  • German patent application DE 196 36 811 A1 an automatic decompression for an internal combustion engine, in particular a single-cylinder diesel engine, with at least one exhaust and an intake valve, which are driven by a camshaft having at least one cam, wherein the exhaust valve is vented to reduce the starting torque when starting the internal combustion engine.
  • the decompression mechanism has a fully automatic, engaging in the cam of the exhaust valve lever device for venting the exhaust valve below a switching speed for the switching from decompression to compression, which causes the lifting of the exhaust valve from the valve seat.
  • a generic support element is for example from the German patent application DE 10 2010 008 928 A1 known. From this publication is a reciprocating internal combustion engine, which after the Four-stroke method is known, with a crankcase, in which at least one cylinder / piston unit is arranged, wherein the piston is designed by means of a connected to a crankshaft connecting rod, with at least one cylinder head closing the cylinder whose inlet and outlet channels of at least one each and exhaust valve are controlled, which are actuated by a camshaft driven rocker arm or rocker arm, wherein the levers are guided on at least one axis and with a brake control device having at least one hydraulic actuator piston which acts on a component that at least the one exhaust valve in addition opens intermittently, wherein the adjusting piston is assigned a pressure source for hydraulic fluid and the inflow to the actuating piston is dominated by at least one electrically controllable valve, wherein on the camshaft a decompression cam per cylinder / piston unit of Hubkolbenbren is arranged,
  • Object of the present invention is to show a measure to prevent this disturbing "starting shaking" in diesel internal combustion engines.
  • the basis of the embodiment of the invention is an already known, hydraulically actuated Wegschlepphebel or clearance compensation element (support member), which offer the possibility to open by an additional stroke a gas exchange valve in compression of the cylinder or to keep open.
  • support member since lubricant pressure is present only during operation of the internal combustion engine, this function is not possible with a hydraulically actuated shift finger lever or clearance compensation element (support element) when starting.
  • there is insufficient lubricant pressure at the start According to the invention it is therefore proposed that the support element and / or the clearance compensation element during a starting phase of the internal combustion engine can be acted upon with a pressure medium, so that the support element is simultaneously in operative connection with the first and the second cam.
  • the pressure medium can be removed from a pressure tank.
  • the pressure medium from an electric pump can be conveyed.
  • the pressure medium according to claim 4 is an already existing lubricant of the internal combustion engine.
  • FIG. 1 shows a hydraulic circuit diagram for a decompression device 1 according to the invention for a reciprocating internal combustion engine, not shown, in particular for a 4-stroke reciprocating internal combustion engine, which operates on the diesel principle, preferably for a passenger car.
  • the hydraulic circuit diagram applies to the decompression device 1 for the reciprocating internal combustion engine, which has a camshaft, not shown, with a camshaft a first 2 and a second cam with different cam profile for actuating a single gas exchange valve 3 via a switchable support element 4, which is operatively connected to the first cam 2 or simultaneously with the first 2 and the second cam, wherein the support element 4 on the one hand on a Backlash compensation element 5 is mounted to oscillate and on the other hand supported on a gas exchange valve 3.
  • a pressure medium in the present case a lubricant of the internal combustion engine is conveyed during operation of the internal combustion engine by a pump, not shown, in a pressure line 8.
  • An injection of the pressure medium in the pressure line 8 is shown by an arrow.
  • the pressure medium is first conveyed through a check valve 10, then further in the direction of a switching valve 9.
  • a clearance compensation element 5 in the present case a hydraulic clearance compensation element 5 can be acted upon with the pressure medium in the present embodiment.
  • the pressure medium is conveyed through a throttle 15, for flow control of the pressure medium, and further through a second check valve 10 back into the pressure medium circuit in the direction of switching valve.
  • a pressure tank 6 is provided for the pressure medium, which can be switched on via a switch pressure tank 7.
  • the clearance compensation element 5 the support member 4, during a start phase of the internal combustion engine can be acted upon with the pressure medium, so that the support element 4 is simultaneously in operative connection with the first 2 and the second cam.
  • the operation is in the FIGS. 2 and 3 shown.
  • an opening of the gas exchange valve is achieved during a compression phase, a cylinder internal pressure is reduced and thus a Starting the engine easier because the compression work for the starter is lower.
  • the clearance compensation element 5 can be lowered or extended with the aid of the pressure means, so that in turn the support element 4 is simultaneously in operative connection with the first 2 and the second cam.
  • FIG. 2 shows a section through the decompression device 1 according to the invention, in the off state, ie only a cam, the first cam 2 is in operative connection with the support element 4.
  • the clearance compensation element 5 is in FIG. 2 not pressurized, so that a locking pin 14 is not locked in the support member 4.
  • a lifting movement of the gas exchange valve 3 is shown schematically with a double arrow.
  • FIG. 3 shows the effect of an action on the play compensation element 5 with the pressure medium.
  • An introduction of the pressure medium in the lash adjuster 5 is marked with a simple arrow.
  • pressure medium is conveyed in the direction of the support element 4 arranged Entriegelungspin 14 and the locking pin 14 is displaced against a spring force in the direction of an arrow and locked so that the support element 4 is now simultaneously with the first 2 and the second cam in operative connection.
  • the exact mode of operation is known, for example, from the Schaeffler publication cited at the outset.
  • FIG. 4 shows in a diagram the stroke course 11 of the first cam 2, the stroke course 12 of the second cam and the stroke curve 13 of a piston of the internal combustion engine.
  • a lifting height is shown over the y-axis from 0 to 9 mm, on the x-axis, the Hubvermony 11, 12, 13 are shown in ° crank angle from 0 to 800 degrees.
  • the stroke course 11 of the first cam corresponds to that of a standard gas exchange valve.
  • the lift cam 12 of the second cam is the engageable cam, which serves to decompress the cylinder.
  • the lift curve 13 of the piston of the internal combustion engine indicates in each case the range of the lower dead center.
  • the inventive design thus a much better starting operation of the internal combustion engine, in particular a diesel engine for passenger vehicles is possible, at the same time much improved acoustics.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP16198838.1A 2015-12-17 2016-11-15 Moteur à combustion interne à pistons alternatifs avec un dispositif de décompression Active EP3181839B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015225727.4A DE102015225727A1 (de) 2015-12-17 2015-12-17 Dekompressionsvorrichtung für eine Hubkolben-Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP3181839A1 true EP3181839A1 (fr) 2017-06-21
EP3181839B1 EP3181839B1 (fr) 2019-07-24

Family

ID=57321210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16198838.1A Active EP3181839B1 (fr) 2015-12-17 2016-11-15 Moteur à combustion interne à pistons alternatifs avec un dispositif de décompression

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EP (1) EP3181839B1 (fr)
DE (1) DE102015225727A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020103459A1 (de) 2020-02-11 2021-08-12 Bayerische Motoren Werke Aktiengesellschaft Schaltschlepphebel für einen Ventiltrieb einer Brennkraftmaschine

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221394A1 (de) 1992-06-30 1994-01-05 Farymann Diesel Dekompressionsvorrichtung für Brennkraftmaschinen
DE19636811A1 (de) 1996-09-11 1998-03-12 Hatz Motoren Dekompressionsautomatik
DE10028474A1 (de) 2000-06-08 2001-12-13 Schaeffler Waelzlager Ohg Vorrichtung zur Dekompression einer ventilgesteuerten Brennkraftmaschine
DE10028473A1 (de) 2000-06-08 2001-12-13 Schaeffler Waelzlager Ohg Vorrichtung zur Dekompression einer ventilgesteuerten Brennkraftmaschine
JP2006097535A (ja) * 2004-09-29 2006-04-13 Hino Motors Ltd 可変バルブ機構
DE102008020909A1 (de) 2008-04-17 2009-10-29 Weber Technology Ag Dekompressionsvorrichtung für eine Brennkraftmaschine
JP2011038439A (ja) * 2009-08-07 2011-02-24 Honda Motor Co Ltd 可変動弁装置を備える内燃機関
DE102010008928A1 (de) 2010-02-23 2011-08-25 Schaeffler Technologies GmbH & Co. KG, 91074 Hubkolbenbrennkraftmaschine mit Motorbremsung durch Öffnen der Auslassventile
US20130312687A1 (en) * 2010-03-19 2013-11-28 Eaton Corporation Rocker arm assembly and components therefor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19543445C1 (de) * 1995-11-22 1997-02-20 Porsche Ag Automatische Dekompressionsvorrichtung für ventilgesteuerte Brennkraftmaschinen
US6925978B1 (en) * 2004-08-24 2005-08-09 Delphi Technologies, Inc. Two-step roller finger cam follower having angled lock pin
EP2653673A1 (fr) * 2012-04-19 2013-10-23 Eaton S.r.l. Culbuteur commutable
DE102013020780A1 (de) * 2013-12-11 2015-06-11 Daimler Ag Phasenverstellvorrichtung für einen Ventiltrieb
KR20160070622A (ko) * 2014-12-10 2016-06-20 현대자동차주식회사 연속 가변 밸브 듀레이션 장치 및 이를 이용한 제어방법
DE102015204550A1 (de) * 2015-03-13 2016-09-15 Bayerische Motoren Werke Aktiengesellschaft Nockenwelle mit einer Dekompressionsvorrichtung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221394A1 (de) 1992-06-30 1994-01-05 Farymann Diesel Dekompressionsvorrichtung für Brennkraftmaschinen
DE19636811A1 (de) 1996-09-11 1998-03-12 Hatz Motoren Dekompressionsautomatik
DE10028474A1 (de) 2000-06-08 2001-12-13 Schaeffler Waelzlager Ohg Vorrichtung zur Dekompression einer ventilgesteuerten Brennkraftmaschine
DE10028473A1 (de) 2000-06-08 2001-12-13 Schaeffler Waelzlager Ohg Vorrichtung zur Dekompression einer ventilgesteuerten Brennkraftmaschine
JP2006097535A (ja) * 2004-09-29 2006-04-13 Hino Motors Ltd 可変バルブ機構
DE102008020909A1 (de) 2008-04-17 2009-10-29 Weber Technology Ag Dekompressionsvorrichtung für eine Brennkraftmaschine
JP2011038439A (ja) * 2009-08-07 2011-02-24 Honda Motor Co Ltd 可変動弁装置を備える内燃機関
DE102010008928A1 (de) 2010-02-23 2011-08-25 Schaeffler Technologies GmbH & Co. KG, 91074 Hubkolbenbrennkraftmaschine mit Motorbremsung durch Öffnen der Auslassventile
US20130312687A1 (en) * 2010-03-19 2013-11-28 Eaton Corporation Rocker arm assembly and components therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ARNDT IHLEMANN; NORBERT NITZ: "Eine Technik mit Zukunft oder ein Fall für die Nische?", 10. SCHAEFFLER KOLLOQUIUM, 3 April 2014 (2014-04-03), pages 172 - 187

Also Published As

Publication number Publication date
DE102015225727A1 (de) 2017-07-06
EP3181839B1 (fr) 2019-07-24

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