EP0726385A1 - Soupape d'admission pour chambre de combustion de moteur à combustion interne - Google Patents

Soupape d'admission pour chambre de combustion de moteur à combustion interne Download PDF

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Publication number
EP0726385A1
EP0726385A1 EP95114166A EP95114166A EP0726385A1 EP 0726385 A1 EP0726385 A1 EP 0726385A1 EP 95114166 A EP95114166 A EP 95114166A EP 95114166 A EP95114166 A EP 95114166A EP 0726385 A1 EP0726385 A1 EP 0726385A1
Authority
EP
European Patent Office
Prior art keywords
valve
inlet
valve plate
inlet valve
fuel
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
EP95114166A
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German (de)
English (en)
Other versions
EP0726385B1 (fr
Inventor
Assadollah Dipl.-Ing. Awarzamani
Thomas Dipl.-Ing. Wilfert
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0726385A1 publication Critical patent/EP0726385A1/fr
Application granted granted Critical
Publication of EP0726385B1 publication Critical patent/EP0726385B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group

Definitions

  • the invention relates to an inlet valve for a combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • An inlet valve is already known (DE-OS 36 00 067), which has a hollow shaft in which an outlet valve is slidably mounted.
  • the outlet valve has an outlet valve plate, which is part of an inlet valve plate of the inlet valve, in such a way that in the closed position of the outlet valve the outlet valve plate is flush with the inlet valve plate.
  • the exhaust valve plate In the open position of the exhaust valve, the exhaust valve plate is lifted off the intake valve plate in order to discharge the exhaust gases enclosed after combustion in a combustion chamber of the internal combustion engine via the hollow shaft of the intake valve from the combustion chamber.
  • the exhaust gases flow out of the hollow shaft of the inlet valve from a plurality of outlet openings which are slit-shaped and are excluded from an outer lateral surface of the hollow shaft.
  • the outlet valve is closed in order to draw in a fuel-air mixture from an inlet channel over the open inlet valve.
  • the fuel-air mixture is usually processed by a fuel injection valve, which delivers the fuel in the form of a fuel jet in the direction of the inlet valve.
  • the fuel leaving the fuel injection valve breaks down into the finest fuel droplets in order to produce a fuel-air mixture that is as homogeneous as possible. This can lead to condensation of the fuel droplets on the inner walls of the intake duct, on the inner walls of the combustion chamber and in particular on the valve plate of the intake valve, in particular when the internal combustion engine is cold or in the event of sudden load changes, a wall film of fuel being formed. Only relatively large fuel drops can detach from such a wall film, which then lead to a locally over-greased fuel-air mixture in the combustion chamber. An over-greased fuel-air mixture burns only incompletely, so that the proportion of harmful components in the exhaust gas increases accordingly.
  • the inlet valve according to the invention with the characterizing features of claim 1 has the advantage that a condensation of the fuel, for example, from a fuel injector, in particular on the valve plate of the inlet valve, is avoided in a simple manner. This advantageously prevents an increase in the harmful constituents in the exhaust gas, which otherwise takes place in particular during a cold start and the subsequent warm-up phase and in certain operating areas of the internal combustion engine. In addition, the fuel consumption of the internal combustion engine is also reduced with the intake valve designed according to the invention. Is an advantage also that the inlet valve according to the invention has an increased service life compared to the prior art.
  • the drawing shows a partial sectional view of an intake valve 1 designed according to the invention, which is provided in particular for a mixture-compressing, spark-ignition internal combustion engine.
  • the inlet valve 1 is accommodated in a cylinder head 3 of the internal combustion engine and, for example, is displaceably mounted in a valve guide sleeve 7.
  • the inlet valve 1 has a valve plate 12 which has a flat valve closing surface 17 facing a combustion chamber 20 of the internal combustion engine and a valve plate surface 14 facing away from the combustion chamber 20.
  • the valve plate surface 14 merges into a cylindrical shaft 9 of the inlet valve 1, which ends at an actuation end, not shown, outside the cylinder head 3.
  • a rocker arm for example, engages the actuating end of the shaft 9 in a known manner and brings the inlet valve 1 back into an open position and into a closed position by means of a valve spring.
  • the inlet valve 1 is shown in the drawing in its closed position, in which an annular portion of the valve plate surface 14 bears against an example conical valve seat 15.
  • the valve seat 15 is formed, for example, by a sleeve-shaped valve insert 16, which is introduced into the cylinder head 3, for example, by means of an interference fit.
  • a flow connection is released which connects an inlet channel 18 to the combustion chamber 20 of the internal combustion engine via the open inlet valve 1.
  • the inlet duct 18 is connected, for example, via a sealing ring 11 to an intake pipe 22 of the internal combustion engine.
  • the inlet valve 1 opens upon the downward movement of a piston which is displaceable in the combustion chamber 20, air being sucked in from the surroundings via the suction pipe 22.
  • fuel is mixed into the intake air in the intake pipe 22 in order to obtain an ignitable fuel-air mixture for subsequent combustion in the combustion chamber 20.
  • an electromagnetically actuated fuel injection valve 24 is provided, which is attached to the intake pipe 22, in order to deliver the fuel in the form of a more or less bundled, for example conical, fuel jet 25 in the direction of the intake valve 1 into the intake pipe 22 and the inlet channel 18.
  • the fuel injection valve 24, which is only partially shown in the drawing, is connected to a fuel feed pump 26 for supplying fuel, for example via a fuel distributor (a so-called fuel rail), which pumps the fuel from a fuel tank 27.
  • the fuel emitted by the fuel injector 3 breaks down downstream of the fuel injector 24 into the finest fuel droplets, which mix in the intake pipe 22 and in the inlet duct 18 with the flowing air, so that the most homogeneous fuel-air mixture possible.
  • the fuel-air mixture flows into the combustion chamber 20 when the inlet valve 1 is open, is ignited and burns there with the inlet valve 1 closed.
  • the inlet valve 1 has a stem 9 which, according to the invention, is not solid, but has a cavity 28 in its interior.
  • the cavity 28 has an elongated shape and is removed from the shaft 9, for example, by drilling.
  • the cavity 28 extends from a transition region 31 between the valve plate surface 14 and the stem 9 in the direction of a longitudinal valve axis 5 of the inlet valve 1 and ends in the valve guide sleeve 7 when the inlet valve 1 is closed.
  • the stem 9 has at least one inlet stem opening 30 which leads into the cavity 28 from an outer lateral surface 34 of the stem 9.
  • the valve guide sleeve 7 also has an opening 36 which leads from an inner surface 37 to an outer surface 38 of the valve guide sleeve 7.
  • the valve guide opening 36 is, for example, by drilling out of the valve guide sleeve 7 except and extends, for example, transversely to the valve longitudinal axis 5 of the inlet valve 1.
  • the valve guide opening 36 of the valve guide sleeve 7 is connected to a pressure line 41 via a corresponding cylinder opening 40 in the cylinder head 3.
  • the pressure line 41 is connected, for example, to an electromagnetically actuated two-way valve 44.
  • the two-way valve 44 is connected to a compressed air tank 45 via a connection pressure line 42.
  • the compressed air tank 45 is connected via a compressed air tank line 46 to a pump device 47, for example.
  • the pump device 47 is designed, for example, in the form of a diaphragm-driven air pump, in which the pressure fluctuations generated in a crankshaft housing of the internal combustion engine by a piston due to its upward and downward movements are used to pump a gaseous medium, in particular air.
  • the compressed air tank 45 can be refilled with air by the pump device 47 in certain operating ranges in order to provide sufficient compressed air in the compressed air tank 45 for supplying compressed air.
  • the pressure provided by the compressed air tank 45 is applied to the valve guide opening 36 of the valve guide sleeve 7 via the connection pressure line 42, the pressure line 41 and the cylinder opening 40.
  • valve guide opening 36 of the valve guide sleeve 7 As shown in the drawing, in the closed position of the inlet valve 1 there is an axial distance from the valve guide opening 36 of the valve guide sleeve 7 to the inlet shaft opening 30 of the shaft 9, the valve guide opening 36 being closer to the combustion chamber 20 than is the inlet shaft opening 30 of the shaft 9 the case is. Furthermore, in the transition region 31 between the shaft 9 and the valve plate surface 14, at least one outlet opening 50 is provided on the valve plate 12, which is, for example, transverse to Valve longitudinal axis 5 is excluded from the valve plate surface 14 in order to establish a flow connection with the cavity 28 of the stem 9.
  • the axial distance between the valve guide opening 36 and the inlet shaft opening 30 and their opening cross sections are selected such that when the transition from the closed position into the open position of the inlet valve 1, in particular in the area of the maximum open position of the inlet valve 1, there is a coverage of the inlet shaft opening 30 with the valve guide opening 36 comes that completely open into one another in the maximum open position of the inlet valve 1.
  • compressed air flows from the pressure vessel 45 via the connection pressure line 42, the open two-way valve 44 into the pressure line 41 and via the cylinder opening 40 into the valve guide opening 36 into the cavity 28 and out through the at least one outlet opening 50 the valve plate surface 14 again.
  • a plurality of inlet shaft openings 30 are provided on the circumference of the outer circumferential surface 34 of the shaft 9, so that even when the inlet valve 1 rotates, there is a flow connection of the valve guide opening 36 with at least one of the plurality of inlet shaft openings 30. It is also conceivable to provide a plurality of valve guide openings 36 on the circumference of the outer surface 38 of the valve guide sleeve 7, which then correspond to, for example, a plurality of slit-shaped inlet shaft openings 30 in order to always establish a flow connection from the compressed air tank 45 to the outlet opening 50 of the inlet valve 1 when the inlet valve 1 is in the open position. It is also possible for a circumferential groove to be formed in the region of the valve guide opening 36 on the inner surface 37, with which the inlet shaft opening 30 can overlap in any rotational position of the inlet valve 1 in the open position.
  • an air film is formed in the open position of the inlet valve 1, which essentially surrounds the valve plate 12.
  • the air film prevents condensation of fuel droplets that would otherwise occur, particularly in the cold state of the internal combustion engine and in certain operating areas of the internal combustion engine, which then accumulate in particular on the valve plate surface 14.
  • outlet openings 50 are also possible to provide, instead of or in addition to the outlet openings 50 in the transition region 31, further outlet openings 50 which are excluded, for example, from the valve plate surface 14 or from the outer lateral surface 34 of the shaft 9, in particular in the vicinity of the valve plate 12.
  • the outlet openings 50 can also be arranged in such a way that a plurality of outlet openings 50 perforate the valve plate surface 14 in a sieve shape. The compressed air emerging from the plurality of outlet openings 50 creates a particularly uniform air film, which then surrounds the entire valve plate surface 14 with the valve plate 12.
  • valve plate surface 14 with a rough surface which swirls the compressed air emerging from an outlet opening 50 or, for example, from a plurality of outlet openings 50, on the rough surface in such a way that an air flow forms around the valve plate 12.
  • the production of a rough surface of the valve plate surface 14 can for example by a sintering process in which a metal layer is applied to the valve plate surface 14 in order to produce a rough surface.
  • the outlet openings 50 and the rough surface of the valve plate surface 14 it is also possible to form the inlet valve 1 in two parts, a part consisting, for example, of the stem 9 and a part of the valve plate 12, which after the separate machining of the stem 9 and valve plate 12 can be put together again.
  • the blowing out of the compressed air at the inlet valve 1 is provided in particular during the cold start phase and the subsequent warm-up phase and in certain operating areas of the internal combustion engine.
  • the time of the compressed air supply is controllable on the one hand depending on the selected distance of the at least one valve guide opening 36 to the at least one inlet shaft opening 30 and on the other hand by the two-way valve 44.
  • the two-way valve 44 is connected, for example, via an electrical connecting line 52 to an electronic control device 53, which only brings the two-way valve 44 into an open position in certain operating areas, in particular in the cold start phase of the internal combustion engine, in order to blow compressed air out of the inlet valve 1 .
  • the compressed air supply is provided in particular during the first 120 seconds after the internal combustion engine has started.
  • the compressed air emitted via the valve plate surface 14 of the valve plate 12 also has the effect that an improved mixing of the fuel emitted by the fuel injection valve 24 takes place, in particular in the combustion chamber 20. This leads to an optimal combustion of the fuel in the combustion chamber 20, which also reduces the fuel consumption of the internal combustion engine.
  • the intake valve 1 is cooled by the compressed air flowing in the cavity 28 and flowing out of the valve plate 12, so that its thermal load, in particular when the internal combustion engine is fully loaded, is reduced, which increases the service life of the intake valve 1, among other things.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP95114166A 1995-02-09 1995-09-09 Dispositif pour la délivrance de fluide à une soupape d'admission pour chambre de combustion de moteur à combustion interne Expired - Lifetime EP0726385B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19504239 1995-02-09
DE19504239A DE19504239A1 (de) 1995-02-09 1995-02-09 Einlaßventil für einen Brennraum einer Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0726385A1 true EP0726385A1 (fr) 1996-08-14
EP0726385B1 EP0726385B1 (fr) 1999-03-03

Family

ID=7753530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114166A Expired - Lifetime EP0726385B1 (fr) 1995-02-09 1995-09-09 Dispositif pour la délivrance de fluide à une soupape d'admission pour chambre de combustion de moteur à combustion interne

Country Status (4)

Country Link
US (1) US5617835A (fr)
EP (1) EP0726385B1 (fr)
JP (1) JPH08240107A (fr)
DE (2) DE19504239A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041346A1 (fr) * 1996-05-02 1997-11-06 Ab Volvo Dispositif et procede destines a des moteurs a combustion
WO1999010630A1 (fr) * 1997-08-27 1999-03-04 Kvaerner Asa Soupape d'echappement pour moteurs a combustion interne
WO2010104985A3 (fr) * 2009-03-10 2011-03-24 Sturman Digital Systems, Llc Moteur à allumage par compression à double carburant et procédés

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080041343A1 (en) * 2006-07-06 2008-02-21 Parish James R Jr Fuel injection system with cross-flow nozzle for enhanced compressed natural gas jet spray
US9523293B2 (en) * 2013-09-19 2016-12-20 Ford Global Technologies, Llc Internal combustion engine and method for operating an internal combustion engine
CN104405466A (zh) * 2014-10-21 2015-03-11 大连理工大学 压缩空气发动机高压进气门
JP5985003B1 (ja) * 2015-04-27 2016-09-06 三菱電機株式会社 内燃機関用吸気バルブ
WO2017041835A1 (fr) 2015-09-09 2017-03-16 Volvo Truck Corporation Agencement de soupapes
EP3387233B1 (fr) * 2015-12-07 2021-07-14 Volvo Truck Corporation Moteur à combustion interne

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191509667A (en) * 1915-07-02 1916-05-11 Herbert Lindley Improvements in the Construction of Mushroom Valves particularly for Motor Cycle Engines.
US2819704A (en) * 1955-12-09 1958-01-14 Niederman Henry Air cooled engine exhaust valves
FR1401216A (fr) * 1964-01-29 1965-06-04 Union General De Minas Dispositif améliorant le rendement des moteurs à combustion interne et nouvelles soupapes en permettant l'application
DE2048228A1 (de) * 1970-10-01 1972-04-06 Volkswagenwerk Ag, 3180 Wolfsburg Insbesondere luftgekühlte Brennkraftmaschine mit einer Einrichtung zur Abgasnachverbrennung
FR2319011A1 (fr) * 1975-07-23 1977-02-18 Nordstjernan Rederi Ab Systeme de refroidissement pour soupape d'echappement de moteur a combustion interne
DE3600067A1 (de) 1986-01-03 1987-07-09 Juergen Schaefler Einlassventil und auslassventil, insbesondere fuer verbrennungsmotoren

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1799397A (en) * 1927-04-25 1931-04-07 Taylor Cecil Hamelin Internal-combustion engine
US2170267A (en) * 1938-06-17 1939-08-22 Rich Mfg Corp Alloy steel
FR89404E (fr) * 1964-12-23 1967-06-23 Inst Francais Du Petrole Procédé permettant la combustion de mélanges pauvres dans les moteurs à allumage commandé
US4313410A (en) * 1978-04-15 1982-02-02 Nissan Motor Company, Limited Internal combustion engine with fuel injector
JPS5999028A (ja) * 1982-11-27 1984-06-07 Hino Motors Ltd タ−ボ過給機付きデイ−ゼル機関における不足空気の吹込み装置
JPS59158363A (ja) * 1983-02-28 1984-09-07 Hino Motors Ltd 給排気ポ−トへの流体供給装置
US4976248A (en) * 1989-04-03 1990-12-11 James Rowe Apparatus for the generation of turbulence in internal combustion engines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191509667A (en) * 1915-07-02 1916-05-11 Herbert Lindley Improvements in the Construction of Mushroom Valves particularly for Motor Cycle Engines.
US2819704A (en) * 1955-12-09 1958-01-14 Niederman Henry Air cooled engine exhaust valves
FR1401216A (fr) * 1964-01-29 1965-06-04 Union General De Minas Dispositif améliorant le rendement des moteurs à combustion interne et nouvelles soupapes en permettant l'application
DE2048228A1 (de) * 1970-10-01 1972-04-06 Volkswagenwerk Ag, 3180 Wolfsburg Insbesondere luftgekühlte Brennkraftmaschine mit einer Einrichtung zur Abgasnachverbrennung
FR2319011A1 (fr) * 1975-07-23 1977-02-18 Nordstjernan Rederi Ab Systeme de refroidissement pour soupape d'echappement de moteur a combustion interne
DE3600067A1 (de) 1986-01-03 1987-07-09 Juergen Schaefler Einlassventil und auslassventil, insbesondere fuer verbrennungsmotoren

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041346A1 (fr) * 1996-05-02 1997-11-06 Ab Volvo Dispositif et procede destines a des moteurs a combustion
US6138616A (en) * 1996-05-02 2000-10-31 Ab Volvo Device and method in combustion engines
WO1999010630A1 (fr) * 1997-08-27 1999-03-04 Kvaerner Asa Soupape d'echappement pour moteurs a combustion interne
WO2010104985A3 (fr) * 2009-03-10 2011-03-24 Sturman Digital Systems, Llc Moteur à allumage par compression à double carburant et procédés
US8327831B2 (en) 2009-03-10 2012-12-11 Sturman Digital Systems, Llc Dual fuel compression ignition engines and methods

Also Published As

Publication number Publication date
EP0726385B1 (fr) 1999-03-03
DE59505201D1 (de) 1999-04-08
US5617835A (en) 1997-04-08
DE19504239A1 (de) 1996-08-14
JPH08240107A (ja) 1996-09-17

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