WO1999010630A1 - Exhaust valve for internal combustion engines - Google Patents
Exhaust valve for internal combustion engines Download PDFInfo
- 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
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)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002302348A CA2302348A1 (en) | 1997-08-27 | 1998-08-26 | Exhaust valve for internal combustion engines |
EP98941935A EP1023527A1 (en) | 1997-08-27 | 1998-08-26 | Exhaust valve for internal combustion engines |
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 (en) | 1999-03-04 |
Family
ID=19901047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1998/000254 WO1999010630A1 (en) | 1997-08-27 | 1998-08-26 | Exhaust valve for internal combustion engines |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1023527A1 (no) |
JP (1) | JP2001516833A (no) |
KR (1) | KR20010023374A (no) |
CN (1) | CN1277654A (no) |
AU (1) | AU9008898A (no) |
CA (1) | CA2302348A1 (no) |
NO (1) | NO306074B1 (no) |
WO (1) | WO1999010630A1 (no) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009122221A1 (en) * | 2008-04-02 | 2009-10-08 | Dionysios Choidas | Method and arrangements for the cooling of the surroundings of an exhaust valve |
Families Citing this family (2)
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)
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 (de) * | 1995-02-09 | 1996-08-14 | Robert Bosch Gmbh | Einlassventil für einen Brennraum einer Brennkraftmaschine |
WO1998004813A1 (en) * | 1996-07-31 | 1998-02-05 | Kvaerner Asa | An outlet valve for combustion engines and a production method therefor |
-
1997
- 1997-08-27 NO NO973949A patent/NO306074B1/no unknown
-
1998
- 1998-08-26 CA CA002302348A patent/CA2302348A1/en not_active Abandoned
- 1998-08-26 AU AU90088/98A patent/AU9008898A/en not_active Abandoned
- 1998-08-26 KR KR1020007002013A patent/KR20010023374A/ko not_active Application Discontinuation
- 1998-08-26 EP EP98941935A patent/EP1023527A1/en not_active Ceased
- 1998-08-26 CN CN98810576A patent/CN1277654A/zh active Pending
- 1998-08-26 JP JP2000507920A patent/JP2001516833A/ja not_active Withdrawn
- 1998-08-26 WO PCT/NO1998/000254 patent/WO1999010630A1/en not_active Application Discontinuation
Patent Citations (9)
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 (de) * | 1995-02-09 | 1996-08-14 | Robert Bosch Gmbh | Einlassventil für einen Brennraum einer Brennkraftmaschine |
WO1998004813A1 (en) * | 1996-07-31 | 1998-02-05 | Kvaerner Asa | An outlet valve for combustion engines and a production method therefor |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009122221A1 (en) * | 2008-04-02 | 2009-10-08 | Dionysios Choidas | Method and arrangements for the cooling of the surroundings of an exhaust valve |
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 (en) | 1999-03-04 |
EP1023527A1 (en) | 2000-08-02 |
CN1277654A (zh) | 2000-12-20 |
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