WO1999010630A1 - Soupape d'echappement pour moteurs a combustion interne - Google Patents

Soupape d'echappement pour moteurs a combustion interne Download PDF

Info

Publication number
WO1999010630A1
WO1999010630A1 PCT/NO1998/000254 NO9800254W WO9910630A1 WO 1999010630 A1 WO1999010630 A1 WO 1999010630A1 NO 9800254 W NO9800254 W NO 9800254W WO 9910630 A1 WO9910630 A1 WO 9910630A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve stem
cooling duct
insert
exhaust valve
head
Prior art date
Application number
PCT/NO1998/000254
Other languages
English (en)
Inventor
Rolf Kvamsdal
Hans Petter Hildre
Original Assignee
Kvaerner Asa
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 Kvaerner Asa filed Critical Kvaerner Asa
Priority to CA002302348A priority Critical patent/CA2302348A1/fr
Priority to EP98941935A priority patent/EP1023527A1/fr
Priority to JP2000507920A priority patent/JP2001516833A/ja
Priority to KR1020007002013A priority patent/KR20010023374A/ko
Priority to AU90088/98A priority patent/AU9008898A/en
Publication of WO1999010630A1 publication Critical patent/WO1999010630A1/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
    • 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
    • F01L3/12—Cooling of valves
    • F01L3/16—Cooling of valves by means of a fluid flowing through or along valve, e.g. air

Definitions

  • the invention concerns an exhaust valve for internal combustion engines, comprising a cylindrical valve stem with a longitudinal cooling duct with an internal wall surface, and a circular, substantially disc-shaped head securely connected to the valve stem, the head (3) having at least one cooling duct which extends from the bottom of the valve stem's cooling duct to an outlet on the head's surface, in order to conduct coolant through the valve stem, through the head to exhaust gases from the engine.
  • a valve of this kind is described, where there extends through the valve stem and the valve head a passage which leads into a valve surface portion which communicates with the downstream side of the valve.
  • valve In order to achieve high efficiency in an engine the valve must be capable of withstanding high temperatures, thus entailing the choice of a valve material which can withstand high temperatures. In addition, it is advantageous to cool the valve. With the above-mentioned valve, satisfactory cooling of the valve head is obtained, but the cooling of the valve stem is not satisfactory.
  • An object of the invention is to provide a valve of the type mentioned in the introduction where the cooling of the valve stem is better than in the case of known valves.
  • fig. 1 is a longitudinal section through a valve according to the invention.
  • Fig. 2 is a cross section along the intersecting line II-II in fig. 1.
  • Fig. 3 is an enlarged cross section of a valve insert for use in a valve according to the invention.
  • Fig. 4 is an enlarged longitudinal section through a valve head for a valve according to the invention.
  • the same reference numerals are used for corresponding parts or portions of the different figures.
  • Fig. 1 illustrates an exhaust valve for internal combustion engines, comprising a cylindrical valve stem 1, and a circular, substantially disc- shaped head 3 securely connected to the valve stem.
  • the head 3 When the valve is used in a combustion engine, the head 3 will be brought into alternating contact with a not shown valve seat, and heated by passing exhaust gases. Depending on the engine's design, the same exhaust gases will also heat the valve stem to a greater or lesser degree.
  • the valve stem 1 has a longitudinal cooling duct 2, which is connected at its bottom 5 to cooling ducts 4 in the head 3.
  • the cooling ducts 4 lead to an outlet 6 on the head's surface 7.
  • coolant generally air
  • a cross section-reducing insert 8 there is inserted in the valve stem's cooling duct 2 a cross section-reducing insert 8.
  • the insert causes the coolant to flow at a higher rate along the insert, which results in better heat transfer from the valve stem 1 to the coolant in the area in which the insert is located.
  • This improved heat transfer is assumed to be due to the fact that by flowing at a high rate the coolant breaks down a greater portion of the boundary layer along the cooling duct's wall surface 12 than it does at a low rate.
  • the insert 8 is located in such a manner that it extends from or approximately from the bottom 5 of the valve stem's cooling duct and along the valve stem 1 for a length ⁇ which corresponds to at least half of the valve stem's length I2. Improved cooling of the valve stem 1 is thereby achieved in an area where it is most exposed to the hot exhaust gases.
  • the insert 8 is located in such a manner that it extends from or approximately from the bottom 5 of the valve stem's cooling duct and along the valve stem 1 for substantially the entire length I2 of the valve stem. Improved cooling of the whole valve stem 1 is thereby achieved.
  • Fig. 2 which is a cross section through the cooling duct 2 and the insert 8, illustrates a further preferred embodiment where the insert 8 is composed of a longitudinally centrally located, solid central section 9 with longitudinal, outwardly projecting ribs 10 along the circumference, thus providing between the outwardly projecting ribs 10 longitudinal grooves 11 for the coolant.
  • the insert 8 is composed of a longitudinally centrally located, solid central section 9 with longitudinal, outwardly projecting ribs 10 along the circumference, thus providing between the outwardly projecting ribs 10 longitudinal grooves 11 for the coolant.
  • the coolant to be passed along the cooling duct's wall surface 12, resulting in a high degree of heat transfer from the valve stem 1 to the coolant.
  • the valve stem's cooling duct 2 has a circular or polygonal cross section, while at the same time the insert's central section 9 has a circular or polygonal cross section, and is located in the middle of the cooling duct 2.
  • the outwardly projecting ribs 10 extend radially from the central section 9 to the cooling duct's wall surface 12. A uniform distribution is thereby obtained of the grooves 1 1 along the cooling duct's wall surface 12, resulting in a uniform heat transfer from the valve stem 1 to the coolant.
  • Fig. 3 illustrates a further preferred embodiment where the number of outwardly projecting ribs 10 amounts to at least 6. A uniform distribution is thereby obtained of coolant along the cooling duct's wall surface 12, thus ensuring a uniform heat transfer from the valve stem 1 to the coolant.
  • the outwardly projecting ribs 10 have a constant thickness t from the central section 9 to the cooling duct's wall surface 12, i.e. over its entire area, indicated by ri . This gives the insert adequate strength, while at the same time the grooves 1 1 obtain a trapezoidal cross section with the largest side of the trapeze located against the cooling duct's wall surface 12, thus ensuring satisfactory heat transfer from the valve stem 1 to the coolant.
  • the outwardly projecting ribs 10 have a radial extension ⁇ which is approximately equal to the radius r2 of the central section 9. The result of this is that the grooves' 11 trapezoidal cross section obtains a shape which provides a reasonable compromise between the desire for high rate of flow for the coolant, low flow resistance in the cooling duct 2 and good heat transfer from the valve stem 1 to the coolant.
  • Fig. 4 which is an enlarged longitudinal section through the valve head, illustrates a further preferred embodiment where the insert 8 is passed right down to the bottom 5 of the valve stem's cooling duct 2, and a portion 13 of the insert which is located at the bottom 5 of the valve stem's cooling duct is tapered or graduated in order to permit passage of coolant to the cooling ducts 4 in the valve head 3.
  • This provides an advantageous attachment of the insert 8 in the cooling duct 2, since the insert can be passed right down to the bottom of the cooling duct, to abut against it.
  • the other end of the insert may be attached to the valve stem's upper portion in various ways, for example by welding or insertion of an internal plug in the cooling duct 2. Such means of attachment are prior art and will not be discussed further.
  • the insert 8 is inserted into the valve stem's cooling duct 2 with a light force fit.
  • a simple installation of the insert is thereby achieved, while at the same time providing a valve stem in which the insert is at rest in the cooling duct and follows its movement without any play, which could cause undesirable wear on the insert and the cooling duct and flow problems for the coolant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Details Of Valves (AREA)

Abstract

La présente invention concerne une soupape d'échappement pour moteurs à combustion interne. Cette soupape comporte une queue de soupape cylindrique (1) pourvue d'un conduit longitudinal de refroidissement. Elle comporte également une tête de soupape (3) circulaire, sensiblement en forme de disque, assujettie à demeure à la queue (1). La tête (3) est pourvue d'au moins un conduit de refroidissement (4) qui part du bas (5) du conduit de refroidissement (2) de la queue de soupape, et débouche par un orifice (6) sur la surface (7) de la tête. Ce conduit de refroidissement est conçu de façon à conduire un agent refroidissant au travers de la queue de soupape (1), via la tête (3), de façon à évacuer des gaz du moteur. Un insert (8) monté dans le conduit de refroidissement (2) de la queue de soupape vient réduire la lumière du conduit.
PCT/NO1998/000254 1997-08-27 1998-08-26 Soupape d'echappement pour moteurs a combustion interne WO1999010630A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002302348A CA2302348A1 (fr) 1997-08-27 1998-08-26 Soupape d'echappement pour moteurs a combustion interne
EP98941935A EP1023527A1 (fr) 1997-08-27 1998-08-26 Soupape d'echappement pour moteurs a combustion interne
JP2000507920A JP2001516833A (ja) 1997-08-27 1998-08-26 内燃機関用の排気弁
KR1020007002013A KR20010023374A (ko) 1997-08-27 1998-08-26 내연엔진용 배기밸브
AU90088/98A AU9008898A (en) 1997-08-27 1998-08-26 Exhaust valve for internal combustion engines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO973949 1997-08-27
NO973949A NO306074B1 (no) 1997-08-27 1997-08-27 Avgassventil for forbrenningsmotorer

Publications (1)

Publication Number Publication Date
WO1999010630A1 true WO1999010630A1 (fr) 1999-03-04

Family

ID=19901047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1998/000254 WO1999010630A1 (fr) 1997-08-27 1998-08-26 Soupape d'echappement pour moteurs a combustion interne

Country Status (8)

Country Link
EP (1) EP1023527A1 (fr)
JP (1) JP2001516833A (fr)
KR (1) KR20010023374A (fr)
CN (1) CN1277654A (fr)
AU (1) AU9008898A (fr)
CA (1) CA2302348A1 (fr)
NO (1) NO306074B1 (fr)
WO (1) WO1999010630A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009122221A1 (fr) * 2008-04-02 2009-10-08 Dionysios Choidas Procédés et agencements pour le refroidissement du voisinage d’une soupape d'échappement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159100B4 (de) * 2001-12-01 2004-09-16 Man B&W Diesel A/S Hubkolbenmaschine
CN108378675A (zh) * 2018-02-09 2018-08-10 九阳股份有限公司 一种降低油烟的炒菜机

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1438740A (en) * 1973-10-31 1976-06-09 Sulzer Ag Cooled poppet valves for internal combustion engines
SE392148B (sv) * 1971-10-27 1977-03-14 Semt For forbrenningsmotor avsedd och med anordningar for kylning med cirkulerande kylmedel forsedd ventil
SE405033B (sv) * 1973-03-13 1978-11-13 Semt For forbrenningsmotor avsedd ventil
US4187807A (en) * 1978-02-22 1980-02-12 Caterpillar Tractor Co. Cooled engine valve with improved heat transfer
DE3223920A1 (de) * 1982-06-26 1983-12-29 Gesenkschmiede Schneider Gmbh, 7080 Aalen Hohlgeschmiedetes gekuehltes ventil fuer verbrennungsmotoren
DK148122B (da) * 1982-01-26 1985-03-11 B & W Diesel As Koelet udstoedsventil til en stempelforbraendingsmotor
US5458314A (en) * 1993-04-01 1995-10-17 Eaton Corporation Temperature control in an ultra light engine valve
EP0726385A1 (fr) * 1995-02-09 1996-08-14 Robert Bosch Gmbh Soupape d'admission pour chambre de combustion de moteur à combustion interne
WO1998004813A1 (fr) * 1996-07-31 1998-02-05 Kvaerner Asa Soupape de sortie pour moteurs a combustion et leur procede de fabrication

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE392148B (sv) * 1971-10-27 1977-03-14 Semt For forbrenningsmotor avsedd och med anordningar for kylning med cirkulerande kylmedel forsedd ventil
SE405033B (sv) * 1973-03-13 1978-11-13 Semt For forbrenningsmotor avsedd ventil
GB1438740A (en) * 1973-10-31 1976-06-09 Sulzer Ag Cooled poppet valves for internal combustion engines
US4187807A (en) * 1978-02-22 1980-02-12 Caterpillar Tractor Co. Cooled engine valve with improved heat transfer
DK148122B (da) * 1982-01-26 1985-03-11 B & W Diesel As Koelet udstoedsventil til en stempelforbraendingsmotor
DE3223920A1 (de) * 1982-06-26 1983-12-29 Gesenkschmiede Schneider Gmbh, 7080 Aalen Hohlgeschmiedetes gekuehltes ventil fuer verbrennungsmotoren
US5458314A (en) * 1993-04-01 1995-10-17 Eaton Corporation Temperature control in an ultra light engine valve
EP0726385A1 (fr) * 1995-02-09 1996-08-14 Robert Bosch Gmbh Soupape d'admission pour chambre de combustion de moteur à combustion interne
WO1998004813A1 (fr) * 1996-07-31 1998-02-05 Kvaerner Asa Soupape de sortie pour moteurs a combustion et leur procede de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009122221A1 (fr) * 2008-04-02 2009-10-08 Dionysios Choidas Procédés et agencements pour le refroidissement du voisinage d’une soupape d'échappement
GR20080100222A (el) * 2008-04-02 2009-11-19 Διονυσιος Χαραλαμπους Χοϊδας Μεθοδος και διαταξεις ψυξης του περιβαλλοντος βαλβιδας εξαγωγης

Also Published As

Publication number Publication date
NO973949D0 (no) 1997-08-27
JP2001516833A (ja) 2001-10-02
KR20010023374A (ko) 2001-03-26
NO306074B1 (no) 1999-09-13
NO973949L (no) 1999-03-01
AU9008898A (en) 1999-03-16
CA2302348A1 (fr) 1999-03-04
EP1023527A1 (fr) 2000-08-02
CN1277654A (zh) 2000-12-20

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