EP0628701B1 - Dispositif d'étanchéité pour queue de soupape d'un moteur à combustion interne - Google Patents

Dispositif d'étanchéité pour queue de soupape d'un moteur à combustion interne Download PDF

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Publication number
EP0628701B1
EP0628701B1 EP94400923A EP94400923A EP0628701B1 EP 0628701 B1 EP0628701 B1 EP 0628701B1 EP 94400923 A EP94400923 A EP 94400923A EP 94400923 A EP94400923 A EP 94400923A EP 0628701 B1 EP0628701 B1 EP 0628701B1
Authority
EP
European Patent Office
Prior art keywords
valve
volume
pressure
internal combustion
sealing device
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.)
Expired - Lifetime
Application number
EP94400923A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0628701A1 (fr
Inventor
Stéphane Venturi
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0628701A1 publication Critical patent/EP0628701A1/fr
Application granted granted Critical
Publication of EP0628701B1 publication Critical patent/EP0628701B1/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
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant

Definitions

  • the present invention relates to the field of internal combustion engines having at least one cylinder and each combustion chamber of which is supplied with a fuel mixture under pressure via an intake pipe which is itself closed, on the combustion chamber side, by a valve, the movement of each valve being controlled by a cam.
  • the invention provides a sealing device for the valve stem, intended to prevent fuel from leaking from the intake channel to the housing containing the cam (s).
  • valve stems by means of a seal surrounding the valve stem and arranged for example on a member for guiding the valve stem (see US-A-3,120,221).
  • the seals thus used may wear out, be damaged by the very movement of the valve, temperatures, so that their sealing function is no longer (or is poorly) fulfilled after a certain period of operation. .
  • the present invention in particular provides a solution to the aforementioned sealing problem.
  • the subject of the present invention is a sealing device intended to prevent the leaks defined above.
  • the sealing device according to the invention can replace or add to a conventional sealing device.
  • the sealing device according to the invention is based on the use of a back pressure.
  • the back pressure used according to the present invention essentially has a sealing function between two volumes.
  • the displacement of each valve is achieved by means of a cam or equivalent means.
  • the two functions, displacement and sealing, do not interfere in any way between them since the displacement is obtained by mechanical means while the sealing is carried out by essentially pneumatic means of a different physical nature.
  • the system according to the present invention is simple, easy to implement, and therefore reliable.
  • valve the valve seat
  • valve stem the valve stem
  • intake duct the intake duct
  • cams the cam box
  • the present invention aims in particular to improve one of the functions linked to the injection of fuel into the combustion chamber.
  • the present invention relates to a sealing device for a valve stem controlled by a cam contained in a camshaft housing of an internal combustion engine having at least one cylinder.
  • the sealing device comprises a pipe connecting on the one hand an inlet pipe for the fuel mixture into a combustion chamber, closed by a valve, and on the other hand a camshaft housing , and a non-return valve placed in said pipe in order to separate said pipe into two volumes, the first volume being connected to the housing and constituting a pressurized capacity having a pressure P1 greater than or equal to the pressure P2 prevailing in the pipeline. intake and in the second volume, said device being intended to prevent fuel leaks from the intake pipe to the camshaft housing.
  • the second volume is connected to a pump housing of a cylinder of the internal combustion engine.
  • the second volume is connected to a compressor external to the cylinder.
  • the intake pipe is supplied with compressed air and it comprises a pneumatic fuel injector so that said valve acts as a pneumatic injector to spray said fuel into the combustion chamber.
  • the reference 1 indicates the combustion chamber
  • the intake channel bears the reference 2
  • a cam is referenced 3
  • the cam box is referenced 4
  • the valve 5 comprises, on the combustion chamber side 1, a tulip 51 closing the intake orifice 6 and resting on a seat (not referenced);
  • the valve 5 also comprises a rod (or tail) 52 extending the tulip 51 and guided in translation by a guide or equivalent means 7;
  • an elastic return element 8 pushes the valve 5 against the cam 3, which tends to bring the tulip 51 back onto its seat, that is to say to close the orifice 6.
  • the cam 3 on the contrary pushes the valve 5 into the other direction, tending to open port 6.
  • a sealing element 9 such as a seal can be provided for example at the level of the return element 8 in order to ensure a first seal between the intake channel 2 and the cam box 4.
  • the fluid under pressure circulating in channel 2 may for example comprise a mixture of air and fuel; the fuel can be caused to accumulate along the stem of the valve 52, to infiltrate beyond the sealing element 9.
  • the element 9 is particularly effective in preventing leaks in the direction of camshaft 4 towards the conduit 2 but is however very ineffective in preventing leaks in the direction of conduit 2 towards the camshaft 9. This last function is the one for which efficiency is sought according to the invention.
  • the present invention therefore proposes another sealing device, which, as has already been said, can be substitute or add for example to a known sealing device 9.
  • the sealing device notably comprises a pipe 10 connecting the intake pipe 2 to the cam box 4.
  • the valve 11 therefore makes it possible to separate the pipe 10 into two volumes: the first volume 12 in connection with the cam box 4, the second volume 13 communicating with the intake pipe 2.
  • the first volume 12 there is a pressure P1 while that in the second volume 13 there is a pressure P2.
  • the valve 11 opens when the pressure P2 is greater than the pressure P1, thus making the volume 12 play the role of a pressure storage capacity.
  • the volume 12 is in fact almost nonexistent, so that the pressure P1 is the pressure in the cam box 4.
  • FIG. 2 illustrates an embodiment in which the volume 12 appears clearly.
  • FIGS. 1 and 2 differ in particular in the place where the conduit 10 opens:
  • the duct 10 opens out towards the combustion chamber 1 near the intake orifice 6, while in FIG. 2 the tapping is more upstream.
  • Line 2 can convey, for example, a fluid having the pressure of the pump housing, a pressure which of course varies during each engine cycle.
  • the non-return valve 11 therefore makes it possible to store in the volume 12 and in the space 4 the maximum pressure P1 obtained during each cycle. This pressure will oppose, in particular at the level of the stem 52 of the valve 5, the pressure P2 which prevails near the inlet orifice 6 and which is necessarily less than or at most equal to P1.
  • the valve 5 can be used to carry out a pneumatic injection of fuel into the combustion chamber 1, from compressed air taken, for example, from the pump housing of a two-stroke engine.
  • the compressed air can be supplied by a compressor external to the cylinder.
  • a fuel introduction member (not visible in the figures) can be provided; it can open into the intake pipe 2, so that the valve then performs a pneumatic fuel injection function in the combustion chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP94400923A 1993-06-07 1994-04-28 Dispositif d'étanchéité pour queue de soupape d'un moteur à combustion interne Expired - Lifetime EP0628701B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306785 1993-06-07
FR9306785A FR2706181B1 (fr) 1993-06-07 1993-06-07 Dispositif d'étanchéité pour queue de soupape d'un moteur à combustion interne.

Publications (2)

Publication Number Publication Date
EP0628701A1 EP0628701A1 (fr) 1994-12-14
EP0628701B1 true EP0628701B1 (fr) 1996-12-04

Family

ID=9447821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400923A Expired - Lifetime EP0628701B1 (fr) 1993-06-07 1994-04-28 Dispositif d'étanchéité pour queue de soupape d'un moteur à combustion interne

Country Status (5)

Country Link
US (1) US5398650A (ja)
EP (1) EP0628701B1 (ja)
JP (1) JPH0734817A (ja)
DE (1) DE69401032T2 (ja)
FR (1) FR2706181B1 (ja)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2112045A (en) * 1935-04-03 1938-03-22 Gen Electric Seal for combustion engines
FR1021812A (fr) * 1950-03-06 1953-02-24 Dispositif de protection contre les fuites de fluide
US3120221A (en) * 1962-02-13 1964-02-04 Lyons Jim Pneumatic valve return for internal combustion engines
US4753198A (en) * 1986-02-04 1988-06-28 Heath Kenneth E Compression ratio control mechanism for internal combustion engines
SE455111B (sv) * 1986-10-20 1988-06-20 Volvo Ab Ventilfjederanordning med paverkningsorgan for fjeder
US4706967A (en) * 1987-03-27 1987-11-17 General Motors Corporation Valve guide seal device
EP0435730B1 (fr) * 1989-12-29 1994-01-26 Institut Francais Du Petrole Moteur à deux temps à injection pneumatique commandée

Also Published As

Publication number Publication date
FR2706181B1 (fr) 1995-09-01
JPH0734817A (ja) 1995-02-03
FR2706181A1 (fr) 1994-12-16
US5398650A (en) 1995-03-21
DE69401032D1 (de) 1997-01-16
DE69401032T2 (de) 1997-04-03
EP0628701A1 (fr) 1994-12-14

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