EP2459850A2 - Dispositif pour le réglage variable des temps de commande de soupapes d'échanges gazeux d'un moteur à combustion interne - Google Patents

Dispositif pour le réglage variable des temps de commande de soupapes d'échanges gazeux d'un moteur à combustion interne

Info

Publication number
EP2459850A2
EP2459850A2 EP10728151A EP10728151A EP2459850A2 EP 2459850 A2 EP2459850 A2 EP 2459850A2 EP 10728151 A EP10728151 A EP 10728151A EP 10728151 A EP10728151 A EP 10728151A EP 2459850 A2 EP2459850 A2 EP 2459850A2
Authority
EP
European Patent Office
Prior art keywords
pressure medium
pressure
volume
internal combustion
combustion engine
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.)
Granted
Application number
EP10728151A
Other languages
German (de)
English (en)
Other versions
EP2459850B1 (fr
Inventor
Andreas Strauss
Kurt Kirsten
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2459850A2 publication Critical patent/EP2459850A2/fr
Application granted granted Critical
Publication of EP2459850B1 publication Critical patent/EP2459850B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34446—Fluid accumulators for the feeding circuit
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
    • F01L2001/34453—Locking means between driving and driven members
    • F01L2001/34469—Lock movement parallel to camshaft axis

Definitions

  • the invention relates to a device for variably adjusting the timing of gas exchange valves of an internal combustion engine with a drive element an output element at least one pressure chamber and a volume accumulator wherein the output element is rotatably arranged to the drive element, and the pressure chamber is at least partially limited by these components, wherein a phase angle between Pressure medium supply to or from the pressure chamber from the pressure chamber is variably adjustable to the output element and the drive element is provided via the pressure chamber supplied pressure medium or can be led out of this, the volume storage at least one housing and a then movable separator has a Reservoir, which communicates with one of the pressure medium lines separated from a vented Companmentarraum, wherein by pressurizing the storage space, the partition member so in the hous that the volume of the storage room increases at the expense of the Complementary Area
  • devices for variably adjusting the timing of gas exchange valves are used to control the phasing of a camshaft relative to a crankshaft within a defined angular range, between a maximum early and a maximum blade position.
  • Abel to make the device is integrated into a drive train, via which torque is transmitted from the crankshaft to the camshaft.
  • This drive train can be realized for example as a belt, chain or gear drive.
  • Such a device is known for example from DE 10 2007 041 552 A1.
  • the device comprises a phase adjusting device with a drive element, which is in driving connection with the crankshaft, and an output element, which is non-rotatably connected to the camshaft.
  • the phase adjusting device comprises a plurality of pressure chambers, wherein each of the pressure chambers is subdivided by means of a vane into two pressure chambers acting against each other. By supplying pressure medium to or removing pressure medium from the pressure chambers, the vanes are displaced within the pressure chambers, whereby a change in the phase position between the Abt ⁇ ebsele- management and the drive element takes place.
  • the pressure medium inflow to, or the pressure outlet from the pressure chambers is controlled by means of a hydraulic circuit which comprises a pressure medium pump, a pressure medium reservoir, a control valve, and a plurality of pressure medium lines.
  • the control valve has a plurality of pressure medium connections, wherein a pressure medium line connects the pressure medium pump with the control valve. In each case a further pressure medium line connects one of the working ports of the control valve, each with a group of oppositely acting pressure chambers.
  • alternating torques which are caused by the rolling of the cams on each biased with a valve spring gas exchange valves. These torques are transmitted to the phase adjusting device and have a braking or accelerating effect on the adjustment speed of the phase position.
  • a phase adjustment in the direction of later control times and, during the closing of the gas exchange valve, a phase adjustment in the direction of early control times are supported.
  • the pressure medium requirement of the phase adjusting device increases rapidly and can exceed the volume flow demanded by the pressure medium pump.
  • phase adjustment speed does not become due to the assisting alternating torque but through the volume flow of the pressure center I pump determined
  • the supporting contribution of the alternating torques can not be fully exploited This negative effect occurs all the more clearly, the smaller the pressure medium pump is dimensioned
  • a volume accumulator which communicates with the pressure medium line which the pressure medium pump with the control valve
  • the volume accumulator is filled with a piston within a housing against a force storage, in the illustrated embodiment, a compression spring, moved in these phases, the energy storage is stretched, ie, the energy accumulator takes an amount of energy to which the hydraulic system can be fed again. If the system pressure drops, the volume accumulator empties under the influence of the relaxing force accumulator into the hydraulic circuit u Thus, it supports the phase adjustment of the camshaft relative to the crankshaft
  • the invention has for its object to provide a device for variable division of the timing of gas exchange valves of an internal combustion engine, wherein the force acting on the phase control braking effect, caused by pressure medium lack supply, to be minimized without having to dimension the pressure medium pump of the engine larger solution of the problem
  • the object is achieved by the volume accumulator having no energy accumulator which is tensioned when the storage space is filled
  • the Phasenstellein ⁇ chtung is formed for example in the form of a copegelelradverstel- lers and has a drive element, which is driven for example by means of a Switzerlandstoff- or gear drive from a crankshaft of the internal combustion engine. Furthermore, an output element is provided, which has a constant phase position to a camshaft, for example, by means of a frictionally, force or cohesive connection or screw rotatably connected to this The output element is rotatably arranged to the Ant ⁇ eb ⁇ element and at least partially received in this , Within the phase adjusting device, at least one pressure chamber is provided.
  • pressure medium lines are provided, via the pressure chamber, for example, with the interposition of a hydraulic control valve see, with a pressure medium pump and can communicate a pressure medium reservoir of the internal combustion engine
  • phase adjusting device in Axialversteller- Construction in which an axially displaceable by pressure fluid piston cooperates by means of helical gears with the output element and the Antriebseleme ⁇ t.
  • phase adjusting device is known for example from DE 42 18 078 C1.
  • a volume accumulator which has at least one housing and a separating element arranged inside the housing.
  • the separating element may be formed, for example, as a piston or non-elastic membrane and separates inside the housing a reservoir of a complementary space of the reservoir communicates with one of the pressure medium lines, while the complementary space has a vent and communicates with the interior of the internal combustion engine leads with the The pressure medium line connected to the volume accumulator pressure medium, so the reservoir filled and the separating element is displaced within the housing, so that the volume of the reservoir enlarged and the volume of the complementary space is reduced to the same extent It can be provided that the complementary space a venting Thus, gas can escape from the complementary space, for example, in the crankcase or the cylinder head of the internal combustion engine, so that in the complementary space no pressure builds up.
  • a piston is used as a separating element, then it is displaced within the housing when the volume accumulator is filled. In the case of a membrane, this inverts in the direction of the complementary space.
  • the filling takes place already at minimum operating pressures.
  • the filled volume accumulator does not initially empty with decreasing pressure in the pressure medium line. Only when the pressure in the pressure medium line under the pressure which prevails in the complementary space and thus, for example, within the crankcase, drops, the reservoir is emptied into the pressure medium line.
  • the entire volume of the volume memory of the phase adjusting device is only available from the time at which the pressure medium requirement is greater than the volume flow provided by the pressure medium pump.
  • the on the camshaft acting alternating torques are used to a greater extent, which leads to significantly higher adjustment speeds
  • the device further comprises a control valve and at least a second pressure chamber which acts against the first pressure chamber and that a first pressure medium line with the control valve and the first pressure chamber communicates that a second pressure medium line with the control valve and the second pressure chamber communicates and that a third pressure medium line communicates with the control valve and a pressure medium pump, wherein the reservoir communicates with the third pressure medium line
  • a pressure chamber is provided within the phase adjusting device, by a piston or a flight!
  • Each impeller communicates via a pressure medium line to a working port of a control valve.
  • another pressure medium line provided, which connects the pressure medium pump with an inlet port of the control valve.
  • the pressure medium pump can be selectively connected to the first or second pressure chamber.
  • the other pressure chamber is connected to the pressure medium reservoir, so that the piston or the wing is displaced within the pressure chamber. This movement is converted directly or indirectly into an adjustment of the phase position of the output element relative to the Antriebselsment.
  • the pressure medium Due to the connection of the storage space to the pressure medium line, which connects the pressure medium pump with the control valve, the pressure medium is available both for Verstellvor sau in the direction earlier and for adjusting operations in the direction of later timing available It is provided that the storage space between the control valve and the Pressure medium pump opens into the third pressure medium line. In addition, it can be provided that in the communicating with the reservoir pressure medium line upstream of a check valve and a check valve downstream of the volume memory is arranged, both check valves prevent backflow of pressure medium in the direction of the volume accumulator or the pressure medium pump.
  • the non-return valves prevent pressurized fluid from the pressure chambers to be filled, for example the pressure chambers which are connected to the inlet connection of the control valve, from flowing back into the volume accumulator or to the pressure medium pump if pressure peaks occur in these pressure chambers due to the alternating torques acting on the camshaft ,
  • the pressure medium is thus supported on the check valves, whereby the Phasenverstellgeschwmdmaschine increased and phase fluctuations are avoided.
  • the separating element may be formed, for example, as a piston. In this case, this can be formed, for example, of plastic and additionally provided with reinforcing ribs.
  • the piston may be cupped and made from sheet metal blank. Also conceivable are disk-shaped pistons.
  • the piston may separate the reservoir from the complementation chamber by means of a clearance fit in the housing.
  • the Piston to be provided with a sealing element which cooperates sealingly with the housing.
  • an end stop for the piston is provided in the assembly chamber.
  • the end stop can be integrally formed with the housing or made separately therefrom. It can be provided that the contact surface of the end stop is formed smaller than the area of the piston, which limits the Komplementarraum. Thus, it is prevented that the piston surface comes to rest on the housing or the end stop, whereby adhesion forces, which counteract an emptying of the volume memory can be reduced.
  • the end stop can for example be formed circumferentially around a vent opening of the complementary space. In this case, the end stop can completely circulate around the vent opening or be formed with one or more interruptions.
  • the volume accumulator can be arranged, for example, within the internal combustion engine. In this case, gas and pressure medium from the complementary space can be vented directly into the interior of the internal combustion engine via a simple vent opening, additional seals are not necessary. Alternatively it can be provided that the volume accumulator is arranged outside of the internal combustion engine, wherein a Ent Kunststoffungs effet is provided which communicate on the one hand with the complementary space and on the other hand with the interior of the internal combustion engine.
  • the venting line can be formed, for example, in the housing of the volume accumulator or an additional housing which encapsulates the volume accumulator. In this embodiment, seals are provided which seal the vent line and the connection between the reservoir and the pressure medium line to the environment.
  • the volume memory can be connected, for example, by means of a thread formed on this with the cylinder head, the Kurbeigehause or any other surrounding construction.
  • the winds an opening through which the storage room communicates with the pressure medium line.
  • the Voiumenspei- is arranged rather within a camshaft.
  • the volume accumulator can be integrated into the internal combustion engine without the space requirement of the internal combustion engine. Furthermore, this realizes a minimum distance between the volume memory and the phase adjusting device and thus improves the response.
  • the inner wall of the camshaft can serve as a housing, in which the separating element is accommodated
  • FIG. 1 shows only schematically an internal combustion engine
  • FIG. 2 shows a device according to the invention, the phase adjusting device being shown schematically in a plan view and the hydraulic circuit being shown schematically.
  • FIG. 3 shows a longitudinal section through the phase adjusting device from FIG. 2 along the line III-III;
  • FIG. 4 shows a representation of the alternating torque acting on the camshaft
  • FIG. 5 shows a first embodiment of a volume accumulator
  • FIG. 6 shows a second embodiment of a volume memory
  • FIG. 7 shows a third embodiment of a volume memory
  • FIG. 8 shows a fourth embodiment of a volume memory. Detailed description of the drawings
  • FIG. 1 shows an internal combustion engine 1 is sketched, wherein a seated on a crankshaft 2 piston 3 is indicated in a cylinder 4.
  • the crankshaft 2 is in the illustrated Auslanderüngsform via a respective traction drive 5 with an intake camshaft 6 and exhaust camshaft 7 in combination, with a first and a second device 11 for a relative rotation between the crankshaft 2 and the camshafts 6, 7 can provide.
  • Cams 8 of the camshafts 6, 7 actuate one or more inlet gas exchange valves 9 or one or more Auslassgas scaffoldventile 10.
  • FIGS 2 and 3 show a first embodiment of an inventive device 1 1, wherein a Phasenstellein ⁇ chtung 11a in a plan view or in cross section and the hydraulic circuit are shown schematically.
  • the phase adjusting device 11a has a drive element 13 and an output element 14.
  • the output element 14 is designed in the form of an impeller and has a substantially cylindrically designed hub member 16, extend from the outer cylindrical surface in the illustrated embodiment, five wings 17 in the radial direction outwards.
  • the vanes 17 are formed separately from the output element 14 and arranged in vane grooves of the hub element 16.
  • the wings 16 are acted upon by means of winged springs 18, which are arranged between the Nutgrinen the flight in and the wings 17, radially outwardly with a force.
  • winged springs 18 which are arranged between the Nutgrounden the flight in and the wings 17, radially outwardly with a force.
  • a plurality of projections 20 extend radially inward.
  • the projections 20 are formed integrally with the circumferential wall 19.
  • the actuating element 13 is relative to the output element 14 by means of circumferential walls of the projections 20 located radially inwards rotatably mounted on this
  • a chain is arranged, by means of which a torque can be transmitted from the crankshaft 2 to the drive element 13 via a chain drive (not shown)
  • a pressure chamber 21 is formed between each two adjacent circumferentially ⁇ chtung each Each Druckrsume 21 is in recordss ⁇ chtung of opposing, substantially radially extending boundary walls 22 adjacent projections 20, in the axial direction of the side covers 15,
  • each of the pressure chambers 21 protrudes a wing 17 wherein the wings 17 are formed such that they abut both the side covers 15, and on the peripheral wall 19
  • Each wing 17 thus divides the respective pressure chamber 21 into two counteracting pressure chambers 23, 24th
  • the output member 14 is received in the drive member 13 and rotatably supported in a defined Winkeibreich to this
  • the angular range is limited in a direction of rotation of the output element 14 that the wings 17 on each corresponding boundary wall 22 (Fruhanschlag 22a) of the pressure chambers 21 come to rest analog the angular range in the other direction of rotation is limited by the fact that the wings 17 come to rest on the other boundary walls 22 of the pressure chambers 21, which serve as a spade stop 22b
  • the phase position of the output element 14 can be varied relative to the drive element 13
  • the phase position can be kept constant
  • none of the pressure chambers 23, 24 during phases of constant phase position with pressure medium usually the lubricating oil of the internal combustion engine 1 is used
  • a hydraulic circuit 25 For supplying pressure medium to or removing pressure medium from the pressure chambers 23, 24, a hydraulic circuit 25 is provided which comprises a pressure medium pump 26, a pressure medium reservoir 27, a control valve 28 and a plurality of pressure medium lines 25a bp.
  • the control valve 28 has an inlet port P, a tank port T and two working ports A.
  • the first pressure medium line 25a connects the first working connection A to the first pressure chambers 23.
  • the second pressure medium line 25b connects the second working connection B to the second pressure chambers 24.
  • the third pressure medium line 25p connects the pressure medium pump 26 to the inlet connection P.
  • the inlet connection P is connected to the first pressure medium line 25a of the second pressure medium line 25b or to both or none of the pressure medium lines 25a, b
  • the pressure medium supplied to the control valve 28 via the third pressure medium line 25p via the first pressure medium line 25a to the first pressure chambers 23 passes simultaneously pressure medium from the second pressure chambers 24 via the second pressure medium line 25b to the control valve 28 and is ejected into the pressure medium reservoir 27.
  • the wings 17 are moved in the direction of the Fruhanschlags 22a, whereby a rotary movement of the output element 14 is achieved relative to the drive member 13 in the direction of rotation of the phase adjusting device 11a
  • the pressure medium supplied to the control valve 28 via the third pressure medium line 25p via the second pressure medium line 25b to the second pressure chambers 24 is passed.
  • pressure medium from the first pressure chambers 23 reaches the control valve 28 via the first pressure medium line 25a and is ejected into the pressure medium reservoir 27.
  • the wings 17 are displaced in the direction of the late stop 22b, whereby a rotary movement of the output element 14 relative to the Ant ⁇ ebselement 13 counter to the direction of rotation of the Phasenstellein ⁇ chtung 11 a is achieved.
  • the pressure medium supply to all pressure chambers 23, 24 is either prevented or permitted.
  • Characterized the wings 17 are hydraulically clamped within the respective pressure chambers 21, and thus prevents a rotational movement of the output element 14 relative to the drive element 13.
  • each gas exchange valve 9, 10 is periodically opened against the force of a valve spring 30 and closed again.
  • a braking torque which corresponds to the vector product of the force of the valve spring 30 with the lever arm of the cam 8.
  • an accelerating torque which corresponds to the vector product of the force of the valve spring 30 with the lever arm of the cam 8.
  • the positive (negative) component of the alternating torque M shown in FIG. 4 supports the phase adjustment.
  • the output element 14 is both by the system pressure provided by the pressure medium pump 26, as well as by the positive (negative) share of the alternating torque M
  • this can lead to the adjustment process induced by the alternating torques M occurring at such high speeds that the pressure medium volume required by the pressure medium pump 26 does not
  • the second (first) and third pressure medium line 25b (a) arises in the second (first) and third pressure medium line 25b (a), p, a negative pressure, the r counteracts the adjustment
  • the on the camshaft 6, 7 acting alternating torques M are not optimally utilized, but only act up to a limit torque Mi
  • the negative (positive) component of the alternating torque M counteracts the phase adjustment. If the negative (positive) component of the alternating torque M exceeds the torque generated by the pressure medium pump 26, pressure medium from the second (first) pressure chambers 24 (23) is introduced into the second (first) and third pressure medium line 25b (a), p backverdrangt and there is a short time a phase adjustment against the desired direction
  • the pressure medium pump 26 can be dimensioned correspondingly larger, whereby the space requirement, the cost and fuel consumption of the internal combustion engine. 1 increase
  • FIG. 5 shows a possible embodiment of the volume accumulator 31, which is arranged inside the internal combustion engine 1.
  • This comprises a housing 32, in which a separating element 33 is arranged to be freely displaceable.
  • the separating element 33 is designed as a piston which divides the housing 32 into a reservoir 34 and a complementary space 35.
  • the piston carries a sealing element 38 which seals the two spaces against each other.
  • the reservoir 34 opens between two (optional) non-return valves 29 in the third pressure medium line 25p
  • the Complementarraum 35 communicates via a Ent Kunststoffungso réelle 36 with the interior of the internal combustion engine.
  • the phase adjusting device 11a is an additional pressure medium volume at your disposal, which is mobilized only when that of the Pressure medium pump 26 funded pressure medium volume is smaller than the pressure medium volume, which is required for the induced by the alternating torque M phase adjustment.
  • the maximum usable limit torque M 2 and thus the Phasenverstell Marie is significantly increased.
  • the assisting portion of the alternating torque M is utilized to a greater extent to increase the Phasenverstell Malawi and intercepted the counteracting portion.
  • the emptying of the volume accumulator 31 on the basis of the freely displaceable piston that is to say of the missing energy accumulator only begins when the pressure medium volume delivered by the pressure medium pump 26 is smaller than the required pressure medium volume.
  • the piston is designed as a cylindrical component and may consist of a metallic material or a suitable plastic.
  • the end stop 37 runs around the vent opening 36, wherein the piston-facing surface is smaller than the piston surface is formed in order to reduce adhesion forces.
  • FIG. 6 shows a second embodiment of a volume memory 31 of a device 11 according to the invention.
  • the piston is cup-shaped and made from a sheet-metal part by means of a deep-drawing process.
  • the sealing between the storage space 34 and the complementary space 35 takes place via a tightly tolerated sealing gap between the outer lateral surface of the piston and the inner surface of the housing 32.
  • the end stop 37 is formed integrally with the housing 32. Embodiments in which the end stop 37 is also conceivable manufactured as a separate component and fixed in the housing 32. In this case, the separate end stop 37 may be formed as a sealing ring, whereby the sealing effect between the piston and the housing 32 increases is when the volume memory 31 is completely filled.
  • the housing 32 has a pin 40 with a through hole, which opens on the one hand into the reservoir 34 and on the other hand into the third pressure medium line 25p.
  • a thread formed on the outer circumferential surface of the pin 40 the housing 32 is attached to a surrounding structure 42, for example a cylinder head or a crankcase.
  • FIG. 7 shows a third embodiment of a volume accumulator 31 of a device 1 according to the invention.
  • the end stop 37 is interrupted in the circumferential direction by recesses 39, whereby the contact surface between piston and end stop 37 and adhesion forces acting between these components continue be reduced.
  • the piston consists in this form of insurance from a suitable plastic and may be provided with stiffening ribs.
  • FIG. 8 shows a fourth embodiment of a volume accumulator 31 of a device 11 according to the invention.
  • this volume accumulator 31 is arranged outside the internal combustion engine 1.
  • the housing 32 has a pin 40 with a through hole, which opens on the one hand into the reservoir 34 and on the other hand into the third pressure medium line 25p.
  • the housing 32 is encapsulated by a second housing 41, which is fastened to the cylinder head 42 by means of a screw connection.
  • a deaeration line 43 is formed, by means of which the complementary space 35 communicates with the interior of the internal combustion engine 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un dispositif (11) pour le réglage variable des temps de commande de soupapes d'échanges gazeux (9, 10) d'un moteur à combustion interne (1) comprenant un élément d'entraînement (13), un élément de sortie (14), au moins une chambre de pression (23) et un accumulateur de volume (31), l'élément de sortie (14) étant disposé de façon rotative par rapport à l'élément d'entraînement (13) et la chambre de pression (23) étant délimitée au moins en partie par ces composants (13, 14), une position de phase étant réglable de façon variable entre l'élément de sortie (14) et l'élément d'entraînement (13) par l'arrivée d'agent de pression ou l'évacuation d'agent de pression à la chambre de pression et hors de la chambre de pression (23), des conduites d'agent de pression (25a, b, p) étant prévues, par lesquelles un agent de pression peut être amené à la chambre de pression (23) ou évacué de celle-ci, l'accumulateur de volume (31) présentant au moins un boîtier (32) et un élément de séparation (33) coulissant à l'intérieur, qui sépare un espace de réserve (34), qui communique avec l'une des conduites d'agent de pression (25a, b, p), d'un espace complémentaire purgé (35), l'élément de séparation (33) étant déplacé par l'alimentation en agent de pression de l'espace de réserve (34), de telle sorte que le volume de l'espace de réserve (34) augmente aux dépens de l'espace complémentaire (35).
EP20100728151 2009-07-25 2010-06-15 Dispositif pour le réglage variable des temps de commande de soupapes d'échanges gazeux d'un moteur à combustion interne Not-in-force EP2459850B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910034512 DE102009034512A1 (de) 2009-07-25 2009-07-25 Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine
PCT/EP2010/058389 WO2011012370A2 (fr) 2009-07-25 2010-06-15 Dispositif pour le réglage variable des temps de commande de soupapes d'échanges gazeux d'un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2459850A2 true EP2459850A2 (fr) 2012-06-06
EP2459850B1 EP2459850B1 (fr) 2015-04-22

Family

ID=42628528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100728151 Not-in-force EP2459850B1 (fr) 2009-07-25 2010-06-15 Dispositif pour le réglage variable des temps de commande de soupapes d'échanges gazeux d'un moteur à combustion interne

Country Status (6)

Country Link
US (1) US8833318B2 (fr)
EP (1) EP2459850B1 (fr)
CN (1) CN102713171B (fr)
BR (1) BR112012001660A2 (fr)
DE (1) DE102009034512A1 (fr)
WO (1) WO2011012370A2 (fr)

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CN102713171B (zh) 2015-07-22
WO2011012370A2 (fr) 2011-02-03
CN102713171A (zh) 2012-10-03
BR112012001660A2 (pt) 2016-04-12
US20120079998A1 (en) 2012-04-05
WO2011012370A3 (fr) 2013-06-06
DE102009034512A1 (de) 2011-01-27
EP2459850B1 (fr) 2015-04-22
US8833318B2 (en) 2014-09-16

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