EP0628137B1 - Soupape pour l'injection de doses de carburant vaporise dans une conduite d'admission d'un moteur a combustion interne - Google Patents

Soupape pour l'injection de doses de carburant vaporise dans une conduite d'admission d'un moteur a combustion interne Download PDF

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Publication number
EP0628137B1
EP0628137B1 EP94900748A EP94900748A EP0628137B1 EP 0628137 B1 EP0628137 B1 EP 0628137B1 EP 94900748 A EP94900748 A EP 94900748A EP 94900748 A EP94900748 A EP 94900748A EP 0628137 B1 EP0628137 B1 EP 0628137B1
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EP
European Patent Office
Prior art keywords
valve
valve closing
electromagnet
end surface
valve seat
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
EP94900748A
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German (de)
English (en)
Other versions
EP0628137B2 (fr
EP0628137A1 (fr
Inventor
Erwin Krimmer
Wolfgang Schulz
Tilman Miehle
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
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Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M29/00—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M2025/0845—Electromagnetic valves

Definitions

  • the invention is based on a valve for the metered introduction of fuel volatilized from the fuel tank of an internal combustion engine into an intake duct of the internal combustion engine according to the preamble of the main claim.
  • a valve for the metered introduction of fuel volatilized from the fuel tank of an internal combustion engine into an intake duct of the internal combustion engine according to the preamble of the main claim.
  • Such a valve is already known (DE 40 23 044 A1), in which disturbing operating noises can occur, in particular when a solenoid which influences the valve position is actuated in a clocked manner, as a result of touching metallic parts moving relative to one another.
  • US-A-4 901 974 shows a valve for introducing volatilized fuel into internal combustion engines, in which the valve-closure member made of plastic is locked in a circumferential groove on a rod-shaped armature and bears with a collar in the open position on a coil former.
  • a plastic stop body aligned with the core is arranged on the anchor.
  • the valve according to the invention with the characterizing features of the main claim has the advantage that an annoying noise during operation of the valve is avoided.
  • valve according to the invention has improved wear resistance, since metallic parts moving relative to one another are prevented or weakened.
  • FIG. 1 shows a longitudinal section of a first embodiment of a valve according to the invention
  • FIG. 2 shows a partial section of the first embodiment according to the dash-dotted line in FIG. 1
  • FIG. 3 shows a partial section of a second embodiment of a valve according to the invention.
  • the valve shown in FIG. 1 for the metered admixing of fuel volatilized from the fuel tank of a mixture-compressing, spark-ignited internal combustion engine to a fuel / air mixture fed to the internal combustion engine via an intake duct, hereinafter referred to as a tank ventilation valve, is used in a dispensing system for introducing volatilized fuel into a Internal combustion engine used, as described in DE 35 19 292 Al (US 4,763,635).
  • the tank ventilation valve has a two-part valve housing 10 with a cup-shaped housing part 101 and a cap-shaped housing part 102 that terminates this.
  • the housing part 101 carries an inflow connection 11 for connection to a ventilation connection of the fuel tank or to a downstream, filled with activated carbon storage for the volatilized fuel, while the housing part 102 carries an outflow connection 12 for connection to the intake pipe of the internal combustion engine.
  • Inflow connection 11 and outflow connection 12 are each arranged axially in the housing parts 101 and 102, respectively.
  • An electromagnet 13 is arranged in the interior of the pot-shaped housing part 101.
  • the electromagnet 13 has a pot-shaped magnet housing 14 with a coaxial, hollow-cylindrical magnet core 15 penetrating the bottom of the pot, and a cylindrical excitation coil 16 which is seated on a coil carrier 17 which encloses the magnet core 15 in the magnet housing 14.
  • a cylindrical excitation coil 16 which is seated on a coil carrier 17 which encloses the magnet core 15 in the magnet housing 14.
  • an outwardly projecting threaded connector 18 with an internal thread 19 is integrally formed, which is screwed to an external thread section 20 of the hollow cylindrical magnetic core 15.
  • the magnetic core 15 can therefore be axially displaced by rotating the magnet housing 14.
  • the magnetic core 15 is aligned with the inflow nozzle 11, so that the volatilized fuel flowing in here passes directly into the magnetic core 15 and flows through it.
  • the magnet housing 14 and the magnet core 15 screwed to it is inserted in the cup-shaped housing part 101 in such a way that 10 axial channels remain between the outer jacket of the magnet housing 14 and the inner jacket of the valve housing, which channels are offset in the circumferential direction from one another by the same angle. 1 shows, for example, two diametrically opposed axial channels 21, 22.
  • the axial channels 21, 22 are on the one hand above an annular space 23, which remains between the valve housing 10 and the external thread section 20 of the magnetic core 15, with the inflow nozzle 11 and, on the other hand, through bores 24 which are made in the magnet housing 14 near the open end of the magnet housing 14, with the inside of the magnet housing 14 in connection.
  • volatilized fuel emerging from the inflow nozzle 11 also flows around the magnet housing 14 and dissipates any heat generated here.
  • the edge of the magnet housing 14 is angled outwards to form an annular support flange 25, which is bent at the end to form an axially projecting ring web 26.
  • the support flange 25 serves to receive a yoke 27, which covers the magnet housing 14 and rests against the ring web 26 at the edge.
  • the yoke 27 is seated by means of at least two fitting holes 28 on retaining pins 29 formed in the cap-shaped housing part 102, which protrude axially on the underside thereof facing the housing part 101.
  • the yoke 27 is inserted with an exact fit into the support flange 25 with the ring web 26 and clamped therein.
  • valve openings 34 are provided, which can be closed by means of a valve closing member 37 arranged between the yoke 27 and the magnetic core 15.
  • An axial through opening 51 with a boundary wall 52 (FIGS. 2 and 3) is located centrally in the valve closing member 37 coaxially with the hollow cylindrical magnetic core 15, through which volatilized fuel coming from the inflow nozzle 11 can reach the outflow nozzle 12 when the valve opening 34 is open.
  • the valve closing member 37 is made of magnetically conductive material and at the same time forms the armature of the electromagnet 13.
  • the valve closing member 37 is acted upon by a valve closing spring 49 in the valve closing direction.
  • valve closing spring 49 is supported on the one hand on the valve closing member 37 and on the other hand on an annular support shoulder 50 formed on the inner wall of the hollow cylindrical magnetic core 15. By energizing the electromagnet 13, the valve closing member 37 can be actuated against the force of the valve closing spring 49 away from the valve opening 34 in the valve opening direction.
  • the back of the return yoke 27 facing away from the valve closing member 37 is sealed off from the housing part 102 by a sealing ring 42, so that leakage losses via the connection of the return yoke 27 and the magnet housing 14 are avoided.
  • the outflow connector 12 is snapped into a receiving connector 43 which is coaxially formed on the housing part 102.
  • a valve seat 44 of a check valve 45 can be formed in the receiving socket 43 on a radially inwardly projecting annular shoulder, on which a valve body 46 is pressed by a valve spring 47.
  • the valve spring 47 is supported in an abutment 48 provided in the outflow connection 12.
  • the check valve 45 is particularly necessary when the tank ventilation valve is to be used in so-called supercharged engines.
  • FIG. 2 shows a partial section of the first exemplary embodiment of a tank ventilation valve according to the invention shown in FIG. 1 according to the dash-dotted line in FIG. 1.
  • the hollow cylindrical magnetic core 15 of the electromagnet 13 is surrounded by the excitation coil 16 located on the coil carrier 17.
  • the valve closing spring 49 which acts on the valve closing member 37, is supported on the support shoulder 50.
  • the yoke 27 has a cylindrical recess 30 on its side facing the magnetic core 15 in the axial direction.
  • the plate or disc-shaped valve closing member 37 protrudes into the recess 30 and has a slightly smaller diameter than the recess 30, so that a radial gap 31 remains between the circumference of the valve closing member 37 and the wall of the recess 30.
  • the radial gap 31 is dimensioned such that the valve closing member 37 is guided axially displaceably with its circumference in the recess 30.
  • two raised valve seats 32 are formed in the area of, for example, two valve openings 34, which form a valve double seat.
  • the yoke 27 therefore has the function of a valve seat body of the tank ventilation valve.
  • At least three axial through bores 33 are arranged in the valve closing member 37 and lie on an imaginary circle at the same distance from one another.
  • the through bores 33 are penetrated by a damper element 35.
  • the damper element 35 On a first end face 38 of the valve closing member 37 directed toward the double valve seat 32, the damper element 35 extends in the radial direction and in the circumferential direction over at least one partial area 36 which is at least the same size as the at least one valve seat 32 formed on the valve seat body 27.
  • the damper element 35 also seals its portion extending over the first end face 38 of the valve closing member 37 in the valve closing position from the valve openings 34 and dampens an impact of the valve closing member 37 resulting from the valve opening position out of the valve opening position on the valve seat 32 due to the force of the valve closing spring 49.
  • the damper element 35 accordingly also forms a first damping surface 40 on the first end face of the valve closing member 37.
  • the damper element 35 protrudes in the area of the through bores 33 in a bump-like manner beyond the outer contour of the valve closing member 37.
  • the damper element 35 thus forms partial damping surfaces on the second end face 39 in the region of the through bores 33, which together result in a second damping surface 41.
  • the damper element 35 bears with its second damping surface 41 against a stop surface 55 formed by a stop body 54. In this way, a metallic impact of the valve closing member 37 can be prevented or dampened with its second end face 39 on an opposite end face 56 of the magnetic core 15.
  • the stop body 54 is, for example, ring-shaped and pressed onto the end of the magnetic core 15.
  • the stop surface 55 can be axially adjusted together with the end face 56 by means of the adjusting thread formed by the internal thread 19 and the external thread section 20 (FIG. 1). A more or less large axial gap can therefore form between the stop body 54 and the coil body 17.
  • the damper element 35 is formed from rubber-like material, which can be connected to the valve closing member 37 by vulcanization.
  • the damping effect of the damper element 35 is based in particular on the formation of internal friction in the event of a deformation of the damper element 35 due to an impact.
  • the stop ring 54 from non-magnetic material, an unfavorable influencing of the magnetic field geometry of the tank ventilation valve can be avoided. Otherwise, the stop surface 55 can also be formed by the magnetic core 15 itself.
  • FIG. 3 shows a partial section of a second embodiment of a tank ventilation valve according to the invention.
  • the same and equivalent parts are identified by the same reference numerals as in Figures 1 and 2.
  • An essential difference from the first exemplary embodiment is the arrangement of the damper element 35 and the valve closing spring 49.
  • the damper element 35 also extends here over the partial area 36, which is at least as large as the at least one valve seat 32 formed on the valve seat body 37. From the first partial area 36 starting the damper element 35 extends radially inward to the through opening 51 and from there axially lining the through opening 51 along the boundary wall 52 to the second end face 39 of the valve closing member 37. There it closes approximately axially flush with the second end face 39 and forms there second damping surface 41.
  • the damping element 35 can also be formed, for example, in the form of a hump on its second damping surface 41 and / or protrude beyond the outer contour of the valve closing member 37.
  • the valve closing spring 49 encompasses the magnetic core 15 in FIG. 3 and is at least partially penetrated by it.
  • the support shoulder 50 is also arranged on the outer circumference of the magnetic core 15. The arrangement of the valve closing spring 49 outside the magnetic core 15 and the associated increase in its diameter make it possible to increase the guide stability of the valve closing member 37 in the valve support body 27 compared to the internal arrangement according to FIGS. 1 and 2.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Lift Valve (AREA)

Abstract

Dans un modèle connu de soupape de mise à l'air libre de réservoir, il peut se produire, en particulier dans le cas d'une commande cadencée d'un électro-aimant influençant la position de la soupape de mise à l'air libre, des bruits mécaniques gênants en raison d'un contact entre des pièces métalliques en mouvement relatif les unes par rapport aux autres, ce qui doit être évité. L'organe de fermeture (37) de la soupape présente au moins un élément d'amortissement (35) qui traverse entièrement l'organe de fermeture (37) de la soupape dans le sens axial et qui forme, sur la première face frontale (38) de l'organe de fermeture (37) de la soupape, une première surface d'amortissement (40) dirigée vers le siège (27) de la soupape et, sur la deuxième face frontale (39) de l'organe de fermeture (37) de la soupape, une deuxième surface d'amortissement (41) dirigée vers l'électro-aimant (13), ce qui permet d'éviter ou d'atténuer les chocs de l'organe de fermeture (37) de la soupape sur le siège (27) de la soupape ou le noyau magnétique (15). La soupape de mise à l'air libre objet de l'invention convient pour l'injection de doses de carburant vaporisé, provenant du réservoir de carburant associé à un moteur à combustion interne à compression du mélange et allumage commandé, dans une conduite d'admission dudit moteur à combustion interne.

Claims (8)

  1. Soupape servant à l'injection de doses de carburant vaporisé à partir du réservoir de carburant d'un moteur à combustion interne dans une conduite d'admission d'un moteur à combustion interne, avec un organe de fermeture de soupape disposé entre un corps de siège de soupape et un noyau magnétique d'un électroaimant, organe de fermeture de soupape qui présente une ouverture de passage à travers laquelle passe le carburant vaporisé quand la soupape est en position ouverte, et qui a une première face frontale orientée vers le corps de soupape et une seconde face frontale orientée vers l'électroaimant et qui est sollicité par un ressort de fermeture de soupape dans le sens de la fermeture de la soupape et peut être actionné par l'électroaimant dans le sens d'ouverture de la soupape, cet organe étant maintenu pressé quand l'électroaimant ne reçoit pas de courant par sa première face frontale contre au moins un siège de soupape constitué sur le corps du siège de soupape avec au moins un orifice de soupape et quand augmente l'alimentation en courant de l'électroaimant cet organe prenant une position d'ouverture de la soupape,
    caractérisée en ce que
    l'on prévoit sur l'organe de fermeture de la soupape (37) au moins un élément amortisseur (35), qui passe à travers l'organe de fermeture de la soupape (37) dans le sens axial et qui forme sur la première face frontale (38) de l'organe de fermeture de la soupape (37) une première surface d'amortissement (40) orientée vers le corps du siège de soupape (27) et sur la seconde face frontale (39) de l'organe de fermeture de soupape (37) une seconde surface d'amortissement (41) orientée vers l'électroaimant (13), en reposant quand l'électroaimant (13) ne reçoit pas de courant, par sa première face d'amortissement (40) sur l'un au moins des sièges de soupape (32) et quand l'électroaimant (13) reçoit un courant suffisant en reposant par sa seconde surface d'amortissement (41) sur une surface de butée (55).
  2. Soupape selon la revendication 1,
    caractérisée en ce que
    la première surface d'amortissement (41) de l'élément amortisseur (35) s'étend sur une zone partielle (36) de la première face frontale (38) de l'organe de fermeture de soupape (37), qui est au moins aussi grande que le siège de soupape (32) constitué sur le corps de siège de soupape (27), de telle sorte que l'élément amortisseur (35) est pressé, quand l'électroaimant (13) ne reçoit pas de courant, par le ressort de fermeture de soupape (49) et en ce que l'organe de fermeture de soupape (37) est pressé contre le corps du siège de soupape (27) et ferme au moins l'un des orifices de soupape (34) constitué dedans.
  3. Soupape selon la revendication 2,
    caractérisée en ce que
    le ressort de fermeture de la soupape (49) entoure au moins partiellement de façon concentrique l'électroaimant (15) et en ce que l'élément amortisseur (35) s'étend, en partant de la première zone partielle (36) dans le sens axial le long d'une paroi de délimitation (52) de l'ouverture de passage (51) disposée dans l'organe de fermeture de soupape (37) jusqu'à la seconde face frontale (39) environ.
  4. Soupape selon la revendication 2,
    caractérisée en ce que
    l'on constitue dans l'organe de fermeture de la soupape (37) au moins trois alésages traversant de bout en bout (33) qui se trouvent sur un cercle imaginaire à la même distance, alésages dans lesquels pénètre l'élément amortisseur (35) en partant de la première face frontale (38) de façon axiale. L'élément amortisseur (35) sur la seconde face frontale (39) de l'organe de fermeture de la soupape (37) faisant respectivement saillie sur le contour extérieur à cet endroit des surfaces partielles d'amortissement de la seconde surface d'amortissement (41) en fonction du nombre des alésages traversant de bout en bout (33).
  5. Soupape selon la revendication 3 ou 4,
    caractérisée en ce que
    la surface de butée (55) est formée par une face frontale (56) du noyau magnétique (15).
  6. Soupape selon la revendication 3 ou 4,
    caractérisée en ce que
    la surface de butée (55) est formée par un corps de butée (54) relié au noyau magnétique (15).
  7. Soupape selon la revendication 3,
    caractérisée en ce que
    le corps de butée (54) est fabriqué en une matière amagnétique.
  8. Soupape selon la revendication 1,
    caractérisée en ce que
    l'élément amortisseur (35) est réalisé en une matière de type caoutchouc, qui est relié par vulcanisation à l'organe de fermeture de la soupape (37).
EP94900748A 1992-12-24 1993-12-03 Soupape pour l'injection de doses de carburant vaporise dans une conduite d'admission d'un moteur a combustion interne Expired - Lifetime EP0628137B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4244113 1992-12-24
DE4244113A DE4244113A1 (de) 1992-12-24 1992-12-24 Ventil zum dosierten Einleiten von verflüchtigtem Brennstoff in einen Ansaugkanal einer Brennkraftmaschine
PCT/DE1993/001151 WO1994015091A1 (fr) 1992-12-24 1993-12-03 Soupape pour l'injection de doses de carburant vaporise dans une conduite d'admission d'un moteur a combustion interne

Publications (3)

Publication Number Publication Date
EP0628137A1 EP0628137A1 (fr) 1994-12-14
EP0628137B1 true EP0628137B1 (fr) 1997-03-19
EP0628137B2 EP0628137B2 (fr) 2002-08-28

Family

ID=6476560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94900748A Expired - Lifetime EP0628137B2 (fr) 1992-12-24 1993-12-03 Soupape pour l'injection de doses de carburant vaporise dans une conduite d'admission d'un moteur a combustion interne

Country Status (7)

Country Link
US (1) US5560585A (fr)
EP (1) EP0628137B2 (fr)
JP (1) JP3597192B2 (fr)
KR (1) KR100301333B1 (fr)
DE (2) DE4244113A1 (fr)
ES (1) ES2100033T5 (fr)
WO (1) WO1994015091A1 (fr)

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DE4023044A1 (de) * 1990-07-20 1992-01-23 Bosch Gmbh Robert Ventil zum dosierten zumischen von verfluechtigtem kraftstoff zum kraftstoffluftgemisch einer brennkraftmaschine
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Also Published As

Publication number Publication date
EP0628137B2 (fr) 2002-08-28
US5560585A (en) 1996-10-01
ES2100033T5 (es) 2003-03-16
KR950700488A (ko) 1995-01-16
JPH07504259A (ja) 1995-05-11
JP3597192B2 (ja) 2004-12-02
DE4244113A1 (de) 1994-06-30
KR100301333B1 (ko) 2001-12-15
EP0628137A1 (fr) 1994-12-14
ES2100033T3 (es) 1997-06-01
WO1994015091A1 (fr) 1994-07-07
DE59305883D1 (de) 1997-04-24

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