EP0101293A2 - Flexibles Auspuffventil mit Innenkühlung - Google Patents

Flexibles Auspuffventil mit Innenkühlung Download PDF

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Publication number
EP0101293A2
EP0101293A2 EP83304604A EP83304604A EP0101293A2 EP 0101293 A2 EP0101293 A2 EP 0101293A2 EP 83304604 A EP83304604 A EP 83304604A EP 83304604 A EP83304604 A EP 83304604A EP 0101293 A2 EP0101293 A2 EP 0101293A2
Authority
EP
European Patent Office
Prior art keywords
exhaust valve
valve
exhaust
round
stem
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.)
Withdrawn
Application number
EP83304604A
Other languages
English (en)
French (fr)
Other versions
EP0101293A3 (de
Inventor
Merle Robert Showalter
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.)
Automotive Engine Associates LP
Original Assignee
Automotive Engine Associates LP
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 Automotive Engine Associates LP filed Critical Automotive Engine Associates LP
Publication of EP0101293A2 publication Critical patent/EP0101293A2/de
Publication of EP0101293A3 publication Critical patent/EP0101293A3/de
Withdrawn legal-status Critical Current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
    • F01L3/12—Cooling of valves
    • F01L3/14—Cooling of valves by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve

Definitions

  • unburned HC comprises a significant automotive emission problem
  • the exact origin of unburned. HC is, still today, a subject of controversy.
  • the origin of unburned HC was primarily from a quenching boundary layer; but it has now been shown both theoretically and experimentally that the quenching boundary layer is depleted by diffusion during the expansion stroke to such a degree that it must account for less than 4 percent of unburned HC emissions. It has been known for a decade (since the work of Tabazinsky and Keck at MIT) that the concentration of unburned HC in the exhaust is not homogeneous.
  • Tulip Section 1 which is shaped so as to have significant ability to conform to the unround seat on which Sealing Surface 2 must seal.
  • Tulip Section 1 is several orders of magnitude more flexible than the tulip section of conventional exhaust valves, which is typically a plug absolutely incapable of conforming to valve seat out-of-round. It should be clear to those skilled in the automotive arts that Tulip Section 1, partly because of its increased gas side surface area but mainly because of its reduced sections, comprises a cooling problem which will require an internally-cooled valve stem if expensive materials, such as inconel, are to be avoided.
  • Tulip Section 1 is welded to Tubular Stem 4 at 3, preferably by means of a friction weld. It is much cheaper to friction weld a tubular stem to the tulip section rather than to forge the tulip and stem into one piece and then gun drill the stem, as is the current practice for internally-cooled valves.
  • the internal chamber of Tubular Stem 4 will be sealed extremely well by Plug 6 if Plug 6 is first plated by an alloy such as pure nickel which lends itself to diffusion-welding. Plug 6 is tightly pressfit into Tubular Stem 4 and then passed through an induction coil for rapid induction heating and welding. In the internal chamber of the Tubular Stem 4 is Water 5 which serves as a coolant.
  • the Water 5 inside Tubular Stem 4 be in a chambel sealed well enough to contain it for extended periods, and it is also important that the chamber in which the water is contained is devoid of non-condensible gases which reduces the efficiency of the evaporation/condensation heat transfer process.
  • This can be achieved by putting the water in the chamber in the form of ice, accompanied by some calcium oxide and purging the chamber with carbon dioxide prior to welding. This done, Plug 6 is pressfit into Tube 4 and then rapidly induction-diffusion welded to form a seal. When the ice melts, the calcium oxide in the water will react with the C0 2 gas in the chamber to form calcium carbonate, leaving water and water vapor as the only fluids in the chamber.
  • the water in the chamber 4 will form an extremely effective heat transfer arrangement capable of maintaining Tubular Stem 4 in a substantially isothermal condition. It is important that there be room in the chamber for water to expand as it is heated. Ideally, the contents of the chamber should be about half liquid and half gas when at a temperature just below the critical point of water. Under these conditions, the heat transfer through the valve stem via the evaporation/condensation cycle is quite efficient.
  • the size of the hole in the valve stem need not be large (it may, for example, be as small as 1/8 of an inch) because the-viscosity of water becomes quite low at the temperatures at which the evaporation/condensation heat transfer must occur.
  • the end of the valve stem has a Section 7 which may be integral with Plug 6 adapted to the valve keepers which is welded to Stem 4 by diffusion or friction.
  • FIG. 2 shows a conventional exhaust valve for the purposes of comparison.
  • Tulip Section 8 is so stiff as to preclude conformance of the valve to an out-of-round seat.
  • Figure 3 shows a comparison of measured leakage in a steady state rig with a stock type exhaust valve on a set out-of-round by .002" compared to a flexible exhaust valve substantially as shown in Figure 1.
  • Points on the lower curve are for the flexible valve; the higher leakages are for the stock exhaust valve. Leakage is far less with the flexible valve.
  • Other data (not shown) has indicated that the flexible valve's ability to conform to seat out-of-round much in excess of .002" is limited.
  • the combination of a flexible internally-cooled exhaust valve with good quality control on valve seat roundness should substantially reduce exhaust leakage, improve HC emissions and improve engine life.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP83304604A 1982-08-12 1983-08-09 Flexibles Auspuffventil mit Innenkühlung Withdrawn EP0101293A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40749382A 1982-08-12 1982-08-12
US407493 1982-08-12

Publications (2)

Publication Number Publication Date
EP0101293A2 true EP0101293A2 (de) 1984-02-22
EP0101293A3 EP0101293A3 (de) 1985-01-16

Family

ID=23612319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304604A Withdrawn EP0101293A3 (de) 1982-08-12 1983-08-09 Flexibles Auspuffventil mit Innenkühlung

Country Status (3)

Country Link
EP (1) EP0101293A3 (de)
JP (1) JPS5954714A (de)
BR (1) BR8304324A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790272A (en) * 1987-10-15 1988-12-13 Woolenweber William E Non-circular poppet valves for internal combustion engine cylinder assemblies

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1188864B (de) * 1959-06-03 1965-03-11 Maschf Augsburg Nuernberg Ag Ventilsteuerung fuer Brennkraftmaschinen, insbesondere mit Tulpenventil
DE2727006A1 (de) * 1977-06-15 1978-12-21 Kloeckner Humboldt Deutz Ag Tellerventil mit innenkuehlung, insbesondere auslassventil fuer hubkolbenbrennkraftmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790272A (en) * 1987-10-15 1988-12-13 Woolenweber William E Non-circular poppet valves for internal combustion engine cylinder assemblies

Also Published As

Publication number Publication date
EP0101293A3 (de) 1985-01-16
JPS5954714A (ja) 1984-03-29
BR8304324A (pt) 1984-03-20

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB IT SE

PUAL Search report despatched

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Effective date: 19850709

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18D Application deemed to be withdrawn

Effective date: 19860318

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SHOWALTER, MERLE ROBERT