EP0945599A1 - Absperrklappe für eine Leitung und Brennkraftmaschine mit einer solchen Vorrichtung - Google Patents

Absperrklappe für eine Leitung und Brennkraftmaschine mit einer solchen Vorrichtung Download PDF

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Publication number
EP0945599A1
EP0945599A1 EP99400650A EP99400650A EP0945599A1 EP 0945599 A1 EP0945599 A1 EP 0945599A1 EP 99400650 A EP99400650 A EP 99400650A EP 99400650 A EP99400650 A EP 99400650A EP 0945599 A1 EP0945599 A1 EP 0945599A1
Authority
EP
European Patent Office
Prior art keywords
rod
valve
seat
shutter
nut
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Withdrawn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
EP99400650A
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English (en)
French (fr)
Inventor
Daniel Drecq
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0945599A1 publication Critical patent/EP0945599A1/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Withdrawn legal-status Critical Current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
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/06—Rotary or oscillatory slide valve-gear or valve arrangements with disc type valves
    • 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
    • F01L3/10—Connecting springs to valve members

Definitions

  • the present invention relates to an assembly comprising a valve associated with a conduit, and a heat engine, in particular with internal combustion, for example a diesel or petrol or gas engine, comprising at least one cylinder comprising at least one such together.
  • a heat engine in particular with internal combustion, for example a diesel or petrol or gas engine, comprising at least one cylinder comprising at least one such together.
  • the intake and exhaust are generally controlled by a camshaft, directly or through rocker arms.
  • the air passage section, of the air / fuel mixture or exhaust gas is linked to the cam profile, which limits the control of the cylinder opening / closing devices: it is not possible to adjust, as desired, the amount of gas admitted by acting on the opening of the valves according to the parameters of engine operation, in particular, for very low engine speeds motor; this results in low exhaust gas pollution speed, which corresponds to the operation of the engines in the urban conditions of slow traffic.
  • the invention therefore aims to eliminate the drawbacks aforementioned and proposes to replace conventional engine valves thermal by assemblies each consisting of a valve associated with a duct, each set offering a passage cross-section coefficient more efficient and the ability to adjust the cross sections, and therefore pressure losses at gas passage, at independent parameters of the valve control, in particular parameters of engine operation.
  • the invention relates to a set comprising a valve associated with at least one conduit, said valve comprising a rod connected to a shutter to bring the latter against its seat in a closed position of the conduit (s), and move the shutter away from its seat in an open position of the (des) conduit (s), characterized in that the rod is offset by relative to the shutter and intended to be rotated substantially around its axis to move the shutter in circular translation substantially at the right of its seat, in the manner a guillotine.
  • the rod is substantially perpendicular to the shutter and the seat is substantially flat, the shutter having, facing its seat, a substantially flat face, the displacement, during the rotation of the rod, takes place substantially in the seat plan.
  • the rod is advantageously a cylindrical rod of circular cross section driven in rotation about its axis.
  • this set includes a means for axially moving the rod for a short distance at less at the start of the opening of the duct in order to take off the shutter from his seat ; this means can be controlled by the rotation of the rod of the valve.
  • the set of the invention includes means for holding the shutter slightly axially separated from its seat, until the opening of the drove.
  • the means for axially move the valve stem consists of a nut immobilized in rotation and an externally threaded portion of the rod engaging through said nut and cooperating with it, the step of respective threads of the nut and of said portion being weak so as not to move the rod only a short distance.
  • the nut is housed in preferably with axial play in a fixed cage used to immobilize rotating the nut. This axial play is preferably less than the axial displacement of the valve stem, so that the nut comes in abutment against the cage when the duct is opened under the effect of a elastic means for returning the valve to its seat, the cage serving then means to keep the valve away from its seat.
  • the step of threads is determined so that the axial displacement of the rod of the valve during its angular movement, i.e. of the order of a few tenths of a millimeter; the angular displacement of the rod of the valve can be of the order of 90 °.
  • the invention also relates to a heat engine, in particular internal combustion, comprising at least one cylinder associated with at least one intake duct and at least one duct exhaust, characterized in that it comprises, on one at less of its intake or exhaust ducts, a whole valve / conduit as defined above.
  • the engine may include a system electronic or electro-hydraulic control defining the laws opening and closing of each valve according to engine operating parameter (s).
  • the valve C of the invention consists of a generally planar shutter and circular 1 secured at its periphery to a control rod 2 extending perpendicular to the shutter 1.
  • the rod 2 of the valve C is eccentric with respect to shutter 1 as well as with respect to a intake duct 3 formed through the cylinder head 4 of a internal combustion.
  • the shutter 1 bears against a seat 4a provided on the cylinder head 4 to the lower end of the intake duct 3.
  • the rod 2 of the valve C also passes through the cylinder head 4 perpendicularly to the latter and to distance from intake duct 3.
  • the lower end of the rod 2, which is connected to the shutter 1, is located on the side of the cylinder of the engine, while the other end of the rod 2 opens on the other side of the cylinder head 4.
  • This other end of the rod 2 has an externally threaded portion 2a, which engages through a nut 5 housed in a cage 6, which secures the nut against rotation relative to the cylinder head.
  • the nut 5 may have fins or radial ribs 5 a which are received in corresponding notches 6a in the cage 6 to immobilize the rotating nut.
  • the cage 6 has a central opening 6 b for the passage of the rod 2 of the valve and a peripheral flange 6 c at its base for its attachment to the cylinder head 4 of the engine, for example by means of a screw 7.
  • the peripheral flange 6 c of the cage 6 comprises, for example, a through groove 8 in the form of an arc of a circle centered on the axis A of the rod 2, a groove through which engages the screw 7 to allow the initial adjustment of the axial clearance "e” between the cylinder head and the nut and of the axial clearance "f” between the nut and the cage (see FIG. 3).
  • a return spring 9 is interposed between the cage 6 and a cup 10 secured to the upper end of the rod 2; as shown in FIGS. 1 and 3, the cup 10 can carry gear teeth externally in order to ensure the rotational maneuver of the rod 2.
  • the cup 10 can comprise an eccentric mass opposite the valve C so as to balance in rotation the valve-stem-cup assembly and thus reduce the energy necessary for its rotation.
  • the spring 9 bears against this cup 10 by means of a needle bearing 11, or a sliding stop or the like, to avoid torsion of the spring 9 during the rotation of the rod 2 about its axis A
  • the other end of the spring 9 applies the peripheral collar 6c of the cage 6 against the cylinder head.
  • this spring 9 exerts an elastic restoring force on the rod 2 in order to apply the shutter 1 against its seat 4a in the closed position of the conduit.
  • the presence of the clearance f ensures that it is the spring 9 which applies the shutter 1 against its seat 4 a . If this clearance f was not provided, the shutter could be prevented from coming into tight contact with the seat 4a, by prior abutment of the nut 5 against the cage 6.
  • the play e is necessarily linked to the presence of the clearance f to allow adjustment of the latter.
  • games and f are complementary because they correspond to the difference of axial height between nut 5 and cage 6.
  • Initial clearances e and f can be adjusted thanks to the adjustment groove 8 which makes it possible to make pivot the cage 6 and therefore the nut 5 around the axis A; this movement rotation of the nut 5 is accompanied by an axial displacement of the nut 5 in the cage 6 relative to the rod 2 which remains fixed in rotation during of this setting.
  • the rod 2 is rotated around its axis A, which has the effect of simultaneously causing an axial displacement of the rod 2 downward, since the nut 5 is immobilized in rotation.
  • This axial displacement of the rod 2 makes it possible to take off the shutter 1 very slightly from its seat 4 a , and therefore to facilitate the opening of the valve by applying a minimum torque at the level of the rotary control.
  • the pitch of the nut 5 and the external thread of the portion 2 has the shaft 2 is very small and just sufficient to slightly off the valve seat.
  • the spring 9 recalls the rod 2 back upwards until the nut 5 abuts against the cage 6 by filling the initial game f.
  • This initial clearance f is therefore preset so that from the start of the opening of the duct, the nut 5 abuts against the cage 6.
  • the nut 5 can no longer move axially relative to the cage 6, it keeps the shutter 1 slightly axially spaced from the seat 4 has during the subsequent rotation of the rod up to complete opening of the conduit.
  • the return action of the spring 9 is thus neutralized as soon as the opening of the duct begins, and the shutter gradually moves away from its seat until the complete opening.
  • the shutter 1 At the end of the opening stroke, the shutter 1 will have moved over an angle of approximately 90 ° in a plane substantially parallel to the seat 4 a and over a distance of a few tenths of a millimeter in the axial direction.
  • the detachment of the shutter 1 from its seat 4 a from the start of the opening of the duct makes it possible to eliminate the friction between the shutter and its seat, this friction being able to be considerable, during the opening of a duct exhaust, taking into account the pressure that may exist in the cylinder after combustion of the gases.
  • a cylinder 12 comprising an intake duct 3 and a duct exhaust 13 each provided with a valve according to the invention.
  • the angular movement ⁇ of the intake valve can be of the order of 79 ° and the angular movement ⁇ of the exhaust valve can be around 86 °. Note that the opening and closing of these two valves must be synchronized to prevent the shutters 1 of these two valves do not interfere with each other due to the limited size of the cylinder (the respective angular travel of the two shutters is shown in phantom in Figure 5).
  • valves of the type described above can be installed per cylinder, for example, one for intake and one for exhaust, two for intake and one for the exhaust, two for the intake and two for the exhaust.
  • FIGS. 6A to 6G there is shown, schematically, the possible positioning on the same cylinder of four, three or two valves of the type described above.
  • FIGS. 7A to 7F we have shown, for a cylinder with four conduits, the positioning of two double valves relative to these four conduits, the rotation of the stem of a double valve causing the opening or simultaneous closing of two conduits.
  • the shape of the shutter 1 can be a circular sector or any other form of interest in the evolution of the discovery section of the associated duct.
  • the rotation control of the valve stem 2 can be done by a direct current, alternating or stepping electric motor, or by hydraulic servo.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP99400650A 1998-03-27 1999-03-17 Absperrklappe für eine Leitung und Brennkraftmaschine mit einer solchen Vorrichtung Withdrawn EP0945599A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9803804A FR2776704A1 (fr) 1998-03-27 1998-03-27 Ensemble comportant un clapet associe a au moins un conduit et moteur thermique equipe de cet ensemble
FR9803804 1998-03-27

Publications (1)

Publication Number Publication Date
EP0945599A1 true EP0945599A1 (de) 1999-09-29

Family

ID=9524569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99400650A Withdrawn EP0945599A1 (de) 1998-03-27 1999-03-17 Absperrklappe für eine Leitung und Brennkraftmaschine mit einer solchen Vorrichtung

Country Status (3)

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EP (1) EP0945599A1 (de)
FR (1) FR2776704A1 (de)
WO (1) WO1999050538A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10220195A1 (de) * 2002-05-06 2004-05-06 Lev Gilman Viertaktmotor
FR2979966A1 (fr) * 2011-09-13 2013-03-15 Peugeot Citroen Automobiles Sa Dispositif comportant un clapet associe a un conduit et ensemble de motorisation comprenant un tel dispositif
IT201900001821A1 (it) * 2019-02-08 2020-08-08 Spiga Nord Spa Motore ad aria calda

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2979967B1 (fr) 2011-09-13 2014-10-03 Peugeot Citroen Automobiles Sa Dispositif comportant un clapet associe a un conduit et ensemble de motorisation comprenant un tel dispositif

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2874686A (en) * 1957-12-04 1959-02-24 Jr Wesley G Carey Rotating valve for internal combustion engines
GB2043172A (en) * 1979-02-16 1980-10-01 Sulzer Ag System for scavenging and charging the cylinders of a two- stroke internal combustion engine
EP0285363A2 (de) * 1987-04-03 1988-10-05 Jaguar Cars Limited Drehventile

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2712922B1 (fr) 1993-11-22 1996-01-05 Remi Curtil Procédé pour améliorer le fonctionnement d'un moteur thermique suralimenté et balayé avec de l'air, et moteur thermique agencé pour la mise en Óoeuvre du procédé.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2874686A (en) * 1957-12-04 1959-02-24 Jr Wesley G Carey Rotating valve for internal combustion engines
GB2043172A (en) * 1979-02-16 1980-10-01 Sulzer Ag System for scavenging and charging the cylinders of a two- stroke internal combustion engine
EP0285363A2 (de) * 1987-04-03 1988-10-05 Jaguar Cars Limited Drehventile

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10220195A1 (de) * 2002-05-06 2004-05-06 Lev Gilman Viertaktmotor
DE10220195B4 (de) * 2002-05-06 2008-02-07 Lev Gilman Viertaktmotor
FR2979966A1 (fr) * 2011-09-13 2013-03-15 Peugeot Citroen Automobiles Sa Dispositif comportant un clapet associe a un conduit et ensemble de motorisation comprenant un tel dispositif
IT201900001821A1 (it) * 2019-02-08 2020-08-08 Spiga Nord Spa Motore ad aria calda
WO2020161684A1 (en) * 2019-02-08 2020-08-13 Spiga Nord Spa Hot air engine

Also Published As

Publication number Publication date
WO1999050538A1 (fr) 1999-10-07
FR2776704A1 (fr) 1999-10-01

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