EP1122748A1 - Dispositif pour contrôler et réduire la vitesse d'impact d'un actionneur électromécanique - Google Patents
Dispositif pour contrôler et réduire la vitesse d'impact d'un actionneur électromécanique Download PDFInfo
- Publication number
- EP1122748A1 EP1122748A1 EP01400272A EP01400272A EP1122748A1 EP 1122748 A1 EP1122748 A1 EP 1122748A1 EP 01400272 A EP01400272 A EP 01400272A EP 01400272 A EP01400272 A EP 01400272A EP 1122748 A1 EP1122748 A1 EP 1122748A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- electromagnet
- stop
- plate
- rod
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/088—Electromagnets; Actuators including electromagnets with armatures provided with means for absorbing shocks
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
- F01L2009/2151—Damping means
Definitions
- the present invention relates to a device to control and reduce the speed of impact of an electromechanical actuator against stops of the organ ordered by it and applies more particularly, although not exclusively, when ordering valves of an internal combustion engine.
- this set comprises, associated with the valve stem, two windings electromagnetic neighbors but separated by an air gap whose distance is substantially equal to the stroke of the valve head, the rod being integral with a plate transverse in magnetic material, housed in the air gap between the two windings, so that, depending on the direction of the current alternately flowing through these, this tray is attracted to one or the other, so that the valve moves from its open position to that of its closing, the swash plate on either side of a intermediate equilibrium position.
- the valve stem is associated with working springs respectively and simultaneously in compression and extension or vice versa as the case may be, in particular according to the direction of movement of the valve stem towards of one or the other of the two windings, at the opening or closing, the effect of these springs adding to that of the electromagnetic attraction force exerted on the transverse plate, created alternately by the windings.
- FIGS. 1a, 1b and 1c schematically illustrate a known device of this kind.
- reference 1 designates a rod illustrated in vertical position which has at its lower end a valve head 2 and at its opposite end a bearing surface 3 for a spring 4, mounted between this span and a fixed stop 5.
- the rod 1 has on the side of the valve head 2 a other bearing surface 6 for a second spring 7, mounted between this bearing surface and a fixed guide 8 having a bore through 9 in which slides, according to a movement of back and forth, the corresponding end of the rod 1.
- This rod is also equipped, between the spans support 3 and 6 of springs 4 and 7, of a plate transverse 10 which, if the rod is vertical, extends horizontally, this plate being mounted in an air gap 11 formed between two electromagnets, respectively 12 and 13, each of these electromagnets comprising a yoke 14 in magnetic material and an electrical winding 15, of so that the passage of a current through the windings of two electromagnets cause an effect on the plate 10 of attraction by one of these electromagnets and repulsion by the other, the valve head 2 thus oscillating between two positions where the plate is in contact with one or the other of the electromagnets.
- FIG 1a illustrates the equilibrium position of the assembly thus envisaged, in which the plate 10 is substantially in the middle of the air gap 11 between the two electromagnets 12 and 13, Figure 1b showing the position where this plate moved to be in contact of the electromagnet 12 and Figure 1c that where conversely, the plate is applied against the electromagnet 13.
- the electromagnet 13 is then supplied with current in order to generate an effort to compensate for this friction and bring the plate 10 into its final position, valve 2 open.
- the plateau is accelerated at the end of the race, its speed at the time of the final impact on the electromagnet when the valve opens or closes being relatively high, of the order of 1 m / sec. This results in noise not negligible during engine operation.
- a first possibility is to soundproof the mechanical environment of the actuator to reduce the noise transmission to the outside of the engine cover, this solution does not act on the cause of the problem, while weighing down the vehicle.
- a different solution in principle is to reduce the effort created by each of the electromagnets, by particular to adjust this effort to the right value necessary to produce a reduction in the acceleration of the plateau at the end of the race.
- This solution is illustrated in particular in patent documents DE-A-19623698, DE-C-19735375, US-A-5769043 and EP-B-0662697.
- a final solution is to increase the effort resistant to movement of the plate at the end of its movements towards one or the other of the two electromagnets, to decrease acceleration and reduce speed impact of this plateau.
- coils can be used complementary electromagnetic to create an effort resistant exercising in the opposite direction to that which provokes the attraction of the plateau.
- This solution is complex and expensive because it requires additional windings, creating congestion problems for the actuator and an increase in electricity consumption for the vehicle (see for example DE-U-29615396, US-A-5730091 or WO-A-9810175).
- shock absorber of the kind including hydraulic stop, which requires parts complementary in motion and special feeding in oil, the stop increasing the magnetic forces to occur during the phase when the valve head remains in open or closed position before reversing displacement (see for example DE-A-19646938).
- the present invention relates to a device for impact speed control and limitation at the end of stroke of an actuator of the aforementioned kind, which is akin to the last solutions mentioned above, by allowing an increase in the resistant force exerted on the plate carried by the valve stem in the application more specifically considered, this increased effort being created during only part of the displacement of the actuator, in order to decrease its speed just before the moment when he reaches one or other of his end positions, when opening or closing the valve head.
- DE-A-19646937 illustrates a similar device in which the swash plate carried by the valve stem includes stops made of an elastomeric material, mounted such that these stops partially protrude out of the apparent outline of the plateau, towards respectively of one and the other of the two electromagnets and in particular of the rigid breech thereof.
- these field lines have only one narrow passage at the stops, in the section of the plate which separates the two opposite grooves receiving these stops in one and the other of the faces thereof. From then, to keep good performance to the whole, it is necessary to use a higher current at the crossing of the coil of each of the two electromagnets or yet to oversize these coils, which is penalizing.
- the present invention relates to an improvement made the production of elastic stops to cushion the impact of the plate at the end of the race on the cylinder heads of two electromagnets, which eliminates the last drawbacks cited above.
- the device for controlling and reducing the impact speed of an actuator comprising a rod command subject to a back-and-forth movement according to its axis, this rod being integral with a transverse plate having two opposite faces extending substantially perpendicular to the rod and moving in a air gap defined by at least one attractive electromagnet alternately the plate in combination with an effort created by antagonistic springs acting on the rod, the plate oscillatingly moving from a intermediate equilibrium position between two positions in which he comes into contact with a electromagnet, is characterized in that at least one of the electromagnets has, opposite the transverse plate integral with the rod, at least one elastic stop fixed to the electromagnet and against which the plate comes in contact at the end of the stroke to brake it in its displacement.
- the solution thus proposed therefore involves one and preferably two elastic stops, i.e. one for each direction of movement of the valve, which are here directly associated, not with the transverse plate itself - which avoids any particular machining thereof for mounting the stops - but with electromagnets actuator control, these stops, due to their crushing, being arranged so as to increase the effort resistant which opposes the displacements of the plate transverse carried by the rod in order to decrease the speed of this plateau at the end of the race when it approaches either of its final positions, at the opening or when the valve closes.
- each electromagnet has a metal yoke comprising an axial central frame on which is mounted the winding of an electric coil whose turns extend in a plane perpendicular to the reinforcement, the stop being made integral with the coil in the face of this one which is opposite the transverse plate.
- the yoke of each electromagnet has, in cross section, the shape of an "m", including the jamb median constitutes the central reinforcement, the mounted coil around this frame being surrounded externally by an external carcass parallel to the central frame and connected to it by a flat end reinforcement extending perpendicular to the central frame against the side of the coil opposite to that which carries the stop elastic, housed between the central frame and the carcass peripheral.
- the elastic stop has a height such that, before contact with the platform transverse, it slightly exceeds the support plane of this one, from a distance which dimensions the resistant effort braking the speed of the plateau at the end of the stroke.
- the elastic stop is made in the form of one or several continuous strips of an elastomeric material.
- the stop is formed of a plurality of studs separated, preferably regularly distributed over the surface of the coil around the central frame.
- the separate studs may have a profile cylindrical, in regular hyperboloid or in trunk of cone in their anchoring zones on the electric coil, extended by a cylindrical external projecting part.
- Other special shapes for elastic stops could likewise be envisaged, without going beyond the ambit of the present invention.
- the elastic stop is produced in a elastomeric material, such as natural rubber or silicone, clean to generate under the crushing force progressive of it due to the displacement of the plate transverse at the end of the race, a resistant effort, partly proportional to the position and partly proportional to the speed of the plateau, the latter component automatically disappears in position final stage when it is applied and "sticks" on the cylinder head of the electromagnet.
- a elastomeric material such as natural rubber or silicone
- the coil each electromagnet has an electric winding embedded in an insulating resin, the stopper being anchored and glued to the coil via this resin.
- the coils are associated electric 15 of these electromagnets, elastic stops 16, fixed against these coils in their faces which are in look of the plate 10 oscillating in the air gap 11, these stops being dimensioned so as to collapse partially when the plateau, in the terminal phase of its stroke, approaches the breech 14 of one or the other of the two electromagnets 12 or 13 as the case may be, in providing a resistant effort which gradually reduces the impact speed.
- Figure 3 illustrates one of the previous electromagnets, in the electromagnet 12, in the position corresponding where the elastic stop 16 is partially crushed by plate 10 when it "sticks" to the cylinder head 14.
- each electromagnet is preferably consisting of a central frame 17, surrounded by a external carcass 18, these two elements preferably in laminated sheets as is customary in a classic electromagnet, being linked together by a flat end reinforcement 19, the cylinder head thus presenting a general profile in "m".
- the cylinder head 14 has the general shape of a rectangular parallelepiped extending perpendicular to the plan of Figure 2 or 3. More precisely, the reinforcement central 17 has the form of a flat plate which we see the "slice" in Figures 2 and 3 and the carcass 18 is formed of two flat plates 18a and 18b parallel to the central frame 17.
- the electric coil 15 of the electromagnet is cylindrical, housed between the central frame 17 and the carcass peripheral 18, its turns extending substantially horizontally, parallel to the transverse plate 10.
- the elastic stop 16 is attached and fixed against the face upper 20 of the coil 15, which is arranged slightly set back from the ends upper of the central reinforcement 17 and of the carcass external 18, against which the plate 10 is applied as shown in Figure 3.
- the stop 16 consists of two parallel bands 16a and 16b extending perpendicularly in the plan of Figures 2 and 3.
- the elastic stop 16 at rest that is to say when the plate 10 does not produce an effort crushed on it, slightly protrudes out of the outline apparent of the electromagnet, from a distance determined by construction to size the resistant force created by this stop, to brake the transverse plate at the end of race.
- the elastic stop 16 is produced in a rubber, natural or rubber-like elastomeric material synthetic, preferably silicone rubber, to withstand the ambient conditions well in which actuator works, in particular temperature and surrounding atmosphere.
- the stop may be in the form of one or more continuous bands, or be made up of separate studs, preferably regularly distributed on both sides of the frame.
- the cross section of the stopper may be substantially square as shown in the Figures 2 and 3, or present a more complex shape as illustrated in Figures 4a to 4c, with some or anchor heel 16c allowing its immobilization vis-à-vis of the coil 15 and a free part 16d projecting towards the outside, against which the plate 10 is applied partially crushing it.
- the stop 16 can have a profile substantially in hyperboloid shape (Figure 4a) or with a heel anchor 16c of conical shape, extended by a part external cylindrical projection 16d ( Figures 4b and 4c).
- the coils of the electrical winding of the coil 15 are naturally isolated and preferably embedded in a resin, which can also allow immobilization of the stop 16 in the face 20 of this coil, the resin can be poured before or after being put in places the stop, the surface condition of the face 20 being previously prepared to promote bonding of the stop, this operation being all the more easy to put implemented that this stop does not undergo any lateral force in operation.
- the resistant force due to the stop is of the viscoelastic type, so is partly proportional to the crush and partly at the speed of the plateau, so that this last component is canceled when it reaches its final position when glued to the metal cylinder head of the electromagnet.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Control Of Stepping Motors (AREA)
- Moving Of Head For Track Selection And Changing (AREA)
Abstract
Description
- La Figure 2 illustre schématiquement les deux électroaimants de l'actionneur et le plateau transversal oscillant entre eux, avec les butées élastiques contre les bobines de ces électroaimants, avant impact du plateau.
- La Figure 3 représente un des électroaimants de la Figure 2 lorsque le plateau transversal est en fin de course, la butée élastique correspondante étant écrasée entre la bobine et ce plateau.
- Les Figures 4a à 4c illustrent diverses variantes de réalisation et de montage des butées élastiques.
Claims (11)
- Dispositif pour contrôler et réduire la vitesse d'impact d'un actionneur électromécanique, comprenant une tige de commande (1) soumise à un déplacement en va-et-vient selon son axe, cette tige étant solidaire d'un plateau transversal (10) présentant deux faces opposées s'étendant sensiblement perpendiculairement à la tige et se déplaçant dans un entrefer (11) délimité par au moins un électroaimant (12, 13) attirant alternativement le plateau en combinaison avec un effort créé par des ressorts antagonistes (4, 7) agissant sur la tige, le plateau se déplaçant de façon oscillante à partir d'une position d'équilibre intermédiaire entre deux positions finales dans lesquelles il entre en contact avec un électroaimant, caractérisé en ce qu'au moins un électroaimant comporte, en regard du plateau transversal solidaire de la tige, au moins une butée élastique (16) fixée à l'électroaimant et contre laquelle le plateau vient en contact en fin de course pour le freiner dans son déplacement.
- Dispositif selon la revendication 1, caractérisé en ce que chaque électroaimant (12, 13) comporte une culasse métallique (14) comprenant une armature centrale axiale (17) sur laquelle est monté l'enroulement d'une bobine électrique (15) dont les spires s'étendent dans un plan perpendiculaire à l'armature, la butée (16) étant rendue solidaire de la bobine dans la face de celle-ci qui est en regard du plateau transversal (10).
- Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que la culasse (14) de chaque électroaimant (12, 13) présente, en section droite, la forme d'un "m", dont le jambage médian constitue l'armature centrale (17), la bobine montée autour de cette armature étant entourée extérieurement par une carcasse externe (18), parallèle à l'armature centrale et reliée à celle-ci par une armature d'extrémité plane (19) s'étendant perpendiculairement à l'armature centrale contre la face de la bobine opposée à celle qui porte la butée élastique (16), logée entre l'armature centrale et la carcasse périphérique.
- Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce que la butée élastique (16) présente une hauteur telle que, avant contact avec le plateau transversal (10), elle dépasse légèrement le plan d'appui de celui-ci, d'une distance qui dimensionne l'effort résistant freinant la vitesse du plateau en fin de course.
- Dispositif selon l'une quelconque des revendications 2 à 4, caractérisé en ce que la butée élastique (16) est réalisée sous la forme d'une ou plusieurs bandes continues (16a, 16b) en matériau élastomère.
- Dispositif selon l'une quelconque des revendications 2 à 4, caractérisé en ce que la butée élastique (16) est formée d'une pluralité de plots séparés, de préférence régulièrement répartis sur la surface de la bobine (15) autour de l'armature centrale (17).
- Dispositif selon la revendication 6, caractérisé en ce que les plots séparés formant la butée élastique (16) présentent un profil cylindrique, en hyperboloïde régulier ou encore en tronc de cône dans leurs zones d'ancrage (16c) sur la bobine électrique (15), prolongé par une partie cylindrique en saillie externe (16d).
- Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la butée élastique (16) est réalisée en un matériau élastomère, du genre caoutchouc naturel ou synthétique, ou silicone.
- Dispositif selon l'une quelconque des revendications 2 à 8, caractérisé en ce que la bobine (15) de chaque électroaimant (12, 13) comporte un enroulement électrique noyé dans une résine isolante, la butée (16) étant ancrée et collée à la bobine par l'intermédiaire de cette résine.
- Dispositif selon la revendication 9, caractérisé en ce que la résine est coulée autour de l'enroulement électrique de la bobine (15) avant de mettre en place la butée (16).
- Dispositif selon la revendication 9, caractérisé en ce que la butée (16) est mise en place sur l'enroulement électrique de la bobine (15) avant coulée de la résine.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0001321A FR2804540B1 (fr) | 2000-02-02 | 2000-02-02 | Dispositif pour controler et reduire la vitesse d'impact d'un actionneur electromecanique |
FR0001321 | 2000-02-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1122748A1 true EP1122748A1 (fr) | 2001-08-08 |
EP1122748B1 EP1122748B1 (fr) | 2010-05-05 |
Family
ID=8846588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01400272A Expired - Lifetime EP1122748B1 (fr) | 2000-02-02 | 2001-02-02 | Dispositif pour contrôler et réduire la vitesse d'impact d'un actionneur électromécanique |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1122748B1 (fr) |
AT (1) | ATE467217T1 (fr) |
DE (1) | DE60141999D1 (fr) |
ES (1) | ES2343779T3 (fr) |
FR (1) | FR2804540B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1450010B1 (fr) * | 2003-02-18 | 2016-07-13 | Peugeot Citroën Automobiles SA | Actionneur électromécanique de soupape pour moteur à combustion interne et moteur à combustion interne muni d'un tel actionneur |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49109859A (fr) * | 1973-02-21 | 1974-10-18 | ||
JPS6177312A (ja) * | 1984-09-25 | 1986-04-19 | Matsushita Electric Works Ltd | 電磁ソレノイド |
EP0504806A2 (fr) * | 1991-03-18 | 1992-09-23 | Klöckner-Humboldt-Deutz Aktiengesellschaft | Soupape électromagnétique pour un dispositif d'injection de combustible |
DE29700096U1 (de) * | 1997-01-04 | 1998-04-30 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Elektromagnetischer Aktuator zur Betätigung eines Gaswechselventils mit Dämpfungsmitteln zur Verminderung der Körperschallübertragung |
JPH11135321A (ja) * | 1997-10-29 | 1999-05-21 | Matsushita Electric Works Ltd | 電磁ソレノイド |
DE19757658A1 (de) * | 1997-12-23 | 1999-07-01 | Siemens Ag | Elektromechanischer Stellantrieb |
JPH11191512A (ja) * | 1997-10-21 | 1999-07-13 | Ckd Corp | ソレノイド |
-
2000
- 2000-02-02 FR FR0001321A patent/FR2804540B1/fr not_active Expired - Fee Related
-
2001
- 2001-02-02 AT AT01400272T patent/ATE467217T1/de not_active IP Right Cessation
- 2001-02-02 ES ES01400272T patent/ES2343779T3/es not_active Expired - Lifetime
- 2001-02-02 DE DE60141999T patent/DE60141999D1/de not_active Expired - Lifetime
- 2001-02-02 EP EP01400272A patent/EP1122748B1/fr not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49109859A (fr) * | 1973-02-21 | 1974-10-18 | ||
JPS6177312A (ja) * | 1984-09-25 | 1986-04-19 | Matsushita Electric Works Ltd | 電磁ソレノイド |
EP0504806A2 (fr) * | 1991-03-18 | 1992-09-23 | Klöckner-Humboldt-Deutz Aktiengesellschaft | Soupape électromagnétique pour un dispositif d'injection de combustible |
DE29700096U1 (de) * | 1997-01-04 | 1998-04-30 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Elektromagnetischer Aktuator zur Betätigung eines Gaswechselventils mit Dämpfungsmitteln zur Verminderung der Körperschallübertragung |
JPH11191512A (ja) * | 1997-10-21 | 1999-07-13 | Ckd Corp | ソレノイド |
JPH11135321A (ja) * | 1997-10-29 | 1999-05-21 | Matsushita Electric Works Ltd | 電磁ソレノイド |
DE19757658A1 (de) * | 1997-12-23 | 1999-07-01 | Siemens Ag | Elektromechanischer Stellantrieb |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 248 (E - 431) 26 August 1986 (1986-08-26) * |
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 10 31 August 1999 (1999-08-31) * |
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1450010B1 (fr) * | 2003-02-18 | 2016-07-13 | Peugeot Citroën Automobiles SA | Actionneur électromécanique de soupape pour moteur à combustion interne et moteur à combustion interne muni d'un tel actionneur |
Also Published As
Publication number | Publication date |
---|---|
DE60141999D1 (de) | 2010-06-17 |
ES2343779T3 (es) | 2010-08-10 |
EP1122748B1 (fr) | 2010-05-05 |
FR2804540A1 (fr) | 2001-08-03 |
ATE467217T1 (de) | 2010-05-15 |
FR2804540B1 (fr) | 2002-09-20 |
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