EP1280982B1 - Actionneur electromagnetique de soupape - Google Patents
Actionneur electromagnetique de soupape Download PDFInfo
- Publication number
- EP1280982B1 EP1280982B1 EP01931817A EP01931817A EP1280982B1 EP 1280982 B1 EP1280982 B1 EP 1280982B1 EP 01931817 A EP01931817 A EP 01931817A EP 01931817 A EP01931817 A EP 01931817A EP 1280982 B1 EP1280982 B1 EP 1280982B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- valve stem
- actuator rod
- rod
- valve
- 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
Links
- 230000000295 complement effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 210000004417 patella Anatomy 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 206010010904 Convulsion Diseases 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/10—Connecting springs to valve members
-
- 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
Definitions
- the present invention relates to improvements to electromagnetic actuators intended to move in axial translation a valve for bring it alternately into an open position and in a closed position. She finds a particularly important application in the control valves of an internal combustion engine, with ignition either by sparks or by compression.
- Actuators of the type referred to by the invention are described in particular in documents FR 2 784 222, FR 99 05203 and DE 198 40 578 A.
- an actuator 10 consisting of a set intended to be mounted on the cylinder head 12 of an engine. he can include a housing consisting of several pieces 14 and 16 stacked and assembled by means not shown, such as only screws. These parts are made of non-ferromagnetic material, for example light alloy. The case can be attached to the cylinder head 12 via a shim 20 also of non-ferromagnetic material.
- the actuator comprises a pallet 22 of material ferromagnetic, advantageously laminated to reduce losses, fixed on an actuator rod 24 intended for the drive of the valve 25.
- a pallet 22 of material ferromagnetic, advantageously laminated to reduce losses fixed on an actuator rod 24 intended for the drive of the valve 25.
- several valves are mounted side by side and one only has of a small width for each actuator in the direction perpendicular to that of Figure 1. This led to give the pallet a rectangular shape.
- the pallet can not turn in room 16.
- the rod actuator 24 can be attached to the pallet by welding and be guided by a ring 26 attached to an extension ring of piece 16.
- the tail 32 of the valve 25 is distinct from the rod 24 and located coaxially in the continuation of this one. She is guided by a ring 29 fixed to the breech and can turn in this one.
- Two return springs 28 a and 28 b are provided to maintain the head 34 of the valve 25 at rest in a substantially middle position between the closed position and the fully open position.
- One of the springs 28 a is associated with the actuator rod 24 and is compressed between a plate or cup 30 fixed to the rod 24 and the extension of the part 16.
- the other spring 28b is compressed between a plate or cup 31 attached to the valve stem 32 and the bottom of the valve well 33 formed in the cylinder head.
- the distribution clearance between the raised rod 24 and the tail 32 of the closed valve 25 ensures the seal.
- each cup 30, 31 is mounted rigidly respectively on the actuator rod 24 and the tail of
- each cup has a tapered bore 35 diverging towards the end of the rod 24 and the tail 32 and is force-fitted on a conical ring 36 integral with the rod 24 and tail 32 (for example formed of two half-rings assembled on either side of the stem 24, respectively of the tail 32 and retained thereon, by a set of grooves and annular ribs mutually interlocked).
- the springs 28 a and 28 b are in the form of helical springs, in particular helical volute springs whose small diameter end is supported on the corresponding cup 30, 31 respectively.
- the support of each spring on the associated cup is not strictly identical over the entire periphery of the cup due to the geometry of the end turn of the spring.
- the spring support force is not rigorously symmetrical around the perimeter of the cup. The consequence is that the force of the spring on the cup is decomposed into an axial thrust component and a transverse component which is communicated by the cup to the rod. This transverse component varies with the compression of the spring and tends to apply the actuator rod 24 and the valve stem 32 against the respective guide ring 26, 29.
- This asymmetric friction variable intensity at the rate of compression and expansion of the springs ( approximately 50 times per second for an engine speed of the order of 3000 revolutions per minute) is a generator of vibration, noise and wear of the friction parts.
- the main purpose of the invention is to propose an improved arrangement of the device set out above which rules out such a risk.
- an electromagnetic actuator valve having a pallet secured to a rod movable actuator substantially axially to cooperate functionally with a valve tail that is substantially in the extension and coaxial to the said actuator rod and movable substantially axially
- elastic return means comprising springs helical coaxially associated respectively with said actuator rod and at said valve stem and being arranged to keep said valve at rest in a middle position between full open positions and closing, said coil springs being side of the cooperating ends of said rod actuator and said valve stem, resting on cups secured respectively of said rods actuator and valve stem, both cups having an axial central cavity in the shape of a cap spherical clean to receive a ball cap complementarily shaped spherical which is integral to the actuator rod or valve stem
- the invention proposes that the spherical cap surface of the cavity the cup and / or the kneecap is hollowed out of throats radials separating spherical cap sectors, so that a lubricating agent can be brought easily between spherical surfaces in motion
- the central axial cavity of the cup is turned towards the free end of the stem actuator or the tail of the valve.
- the ball joint spherical cap shape is a ring reported coaxially on the end of the actuator rod or the valve stem, with in this case the possibility that the ball-shaped spherical cap ring has a tapered center bore and is locked on the end of the actuator rod or the tail of valve by a conical ferrule itself fitted on said end.
- the patella shaped spherical cap is formed in the form of two half-rings assembled, with axial locking, from and else from the end of the actuator rod or the valve stem.
- the invention finds particular application interesting when the coil springs are volute springs with a small diameter end winding is resting on the respective cups, because it is in the case of such coil springs in volute that the transverse component is the most important.
- the cup 30 is held against the massive end portion 37 simply by the spring 28a, and the ball joint thus formed enables an omnidirectional rotating movement of the cup 30 relative to the rod 24, thereby releasing the latter from the effects of transverse component due to spring 28 a .
- the cup 30 is, as in FIG. 2, provided with a cavity with surface 40 concave spherical cap, while that the surface shaped convex spherical cap 38 is provided on an annular ring 41 which is secured at the end of the actuator rod 24 by through a conical ring according to the same type of assembly shown in Figure 1 for the joining together of the cup 30 directly to the rod 24.
- the ring 41 has a conical bore 42 through which it is force-fitted on a ring or conical ferrule 36 integral with the actuator rod 24.
- the conical ring 36 can be formed of two half-rings assembled around the stem 24 and blocked axially on it by a set of grooves (s) and projection (s) provided on the respective cooperating faces and mutually interlocked.
- the ring 41 with external surface convex spherical 38 is replaced by a ring 42 consisting of two half-rings 43 which have a obviously central equipped with a set of throat (s) and / or protrusion (s) adapted to cooperate by interlocking with those complementary actuator rod 24.
- the convex spherical outer surface 38 of one or the other embodiment mentioned above is dug out of grooves 44 of radial extent which facilitate the supply of lubricant between the friction surfaces 38 and 40. Moreover, the presence of such cuts 44 reduces the area of friction surfaces that are reduced to cap sectors 45, and therefore reduces friction.
- bloodletting can similarly be provided in the concave spherical surface 40 of the cup 30. Possibly bleeds can be provided simultaneously in the convex surface 38 and in the concave surface 40.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Lift Valve (AREA)
- Valve Device For Special Equipments (AREA)
Description
- les figures 2 à 4 sont des vues partielles, en coupe et à échelle agrandie, montrant respectivement trois modes de réalisation d'un accouplement articulé d'une coupelle et d'une tige d'actionneur dans lesquels l'invention peut trouver application ; et
- la figure 5 est une vue schématique en perspective de la surface externe d'une rotule mise en oeuvre selon l'invention dans les agencements des figures 2 à 4.
Claims (7)
- Actionneur électromagnétique de soupape (34) ayant une palette (22) solidaire d'une tige d'actionneur (24) mobile sensiblement axialement pour coopérer fonctionnellement avec une queue de soupape (32) qui est sensiblement dans le prolongement et coaxiale à ladite tige d'actionneur (24) et mobile sensiblement axialement, des moyens de rappel élastiques (28a, 28b) comprenant des ressorts hélicoïdaux associés coaxialement respectivement à ladite tige d'actionneur (24) et à ladite queue de soupape (32) et étant agencés pour maintenir au repos ladite soupape (34) dans une position médiane entre des positions d'ouverture complète et de fermeture, lesdits ressorts hélicoïdaux étant, du côté des extrémités coopérantes de ladite tige d'actionneur et de ladite queue de soupape, en appui sur des coupelles (30, 31) solidaires respectivement desdites tige d'actionneur (24) et queue de soupape (32), les deux coupelles (30, 31) présentant une cavité centrale axiale en forme de calotte sphérique (40) propre à recevoir une rotule en calotte sphérique de forme complémentaire (38) qui est solidaire de la tige d'actionneur (24) ou de la queue de soupape (32),
caractérisé en ce que la surface en calotte sphérique de la cavité de la coupelle et/ou de la rotule est creusée de gorges radiales (44) séparant des secteurs (45) de calotte sphérique. - Actionneur selon la revendication 1, caractérisé en ce que la cavité centrale axiale (40) de la coupelle (30, 31) est tournée vers l'extrémité libre de la tige d'actionneur (24) ou respectivement de la queue de la soupape (32).
- Actionneur selon la revendication 1 ou 2, caractérisé en ce que la rotule en forme de calotte sphérique est une partie (37) élargie radialement de la tige d'actionneur (24) ou de la queue de soupape (32).
- Actionneur selon la revendication 1 ou 2, caractérisé en ce que la rotule en forme de calotte sphérique est une bague (41) rapportée coaxialement sur l'extrémité de la tige d'actionneur (24) ou de la queue de soupape (32).
- Actionneur selon la revendication 4, caractérisé en ce que la bague (41) formant rotule en forme de calotte sphérique (38) présente un alésage central conique (42) et est bloquée sur l'extrémité de la tige d'actionneur (24) ou de la queue de soupape (32) par une virole conique (36) elle-même emboítée sur ladite extrémité.
- Actionneur selon la revendication 1 ou 2, caractérisé en ce que la rotule en forme de calotte sphérique (42) est constituée sous forme de deux demi-bagues (43) assemblées, avec blocage axial, de part et d'autre de l'extrémité de la tige d'actionneur (24) ou de la queue de soupape (32).
- Actionneur selon l'une quelconque des revendications précédentes, caractérisé en ce que les ressorts hélicoïdaux (28a, 28b) sont des ressorts en volute dont l'extrémité de petit diamètre d'enroulement est en appui sur les coupelles respectives (30, 31).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0005866A FR2808859B1 (fr) | 2000-05-09 | 2000-05-09 | Actionneur electromagnetique de soupape |
| FR0005866 | 2000-05-09 | ||
| PCT/FR2001/001389 WO2001086123A1 (fr) | 2000-05-09 | 2001-05-07 | Actionneur electromagnetique de soupape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1280982A1 EP1280982A1 (fr) | 2003-02-05 |
| EP1280982B1 true EP1280982B1 (fr) | 2005-01-19 |
Family
ID=8850004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01931817A Expired - Lifetime EP1280982B1 (fr) | 2000-05-09 | 2001-05-07 | Actionneur electromagnetique de soupape |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1280982B1 (fr) |
| AU (1) | AU5851001A (fr) |
| DE (1) | DE60108494T2 (fr) |
| ES (1) | ES2234839T3 (fr) |
| FR (1) | FR2808859B1 (fr) |
| WO (1) | WO2001086123A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2490701B (en) * | 2011-05-10 | 2013-08-21 | Perkins Engines Co Ltd | A connection member for interconnecting a rocker arm and a push rod |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1960709A (en) * | 1931-07-23 | 1934-05-29 | Boyle Valve Company | Engine valve |
| US3273856A (en) * | 1963-12-26 | 1966-09-20 | Trw Inc | Valve stem retainer lock |
| FR2783033B1 (fr) * | 1998-09-04 | 2006-06-02 | Renault | Agencement pour la commande electromagnetique d'une soupape |
| DE19840578A1 (de) * | 1998-09-05 | 2000-03-09 | Bayerische Motoren Werke Ag | Elektromagnetischer Aktuator zur Hubbetätigung eines Gaswechselventils einer Brennkraftmaschine |
| FR2784222B1 (fr) | 1998-10-06 | 2000-12-22 | Sagem | Actionneur electromagnetique de soupape |
-
2000
- 2000-05-09 FR FR0005866A patent/FR2808859B1/fr not_active Expired - Fee Related
-
2001
- 2001-05-07 ES ES01931817T patent/ES2234839T3/es not_active Expired - Lifetime
- 2001-05-07 EP EP01931817A patent/EP1280982B1/fr not_active Expired - Lifetime
- 2001-05-07 DE DE60108494T patent/DE60108494T2/de not_active Expired - Fee Related
- 2001-05-07 WO PCT/FR2001/001389 patent/WO2001086123A1/fr not_active Ceased
- 2001-05-07 AU AU58510/01A patent/AU5851001A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| FR2808859B1 (fr) | 2003-01-17 |
| EP1280982A1 (fr) | 2003-02-05 |
| AU5851001A (en) | 2001-11-20 |
| WO2001086123A1 (fr) | 2001-11-15 |
| ES2234839T3 (es) | 2005-07-01 |
| DE60108494D1 (de) | 2005-02-24 |
| FR2808859A1 (fr) | 2001-11-16 |
| DE60108494T2 (de) | 2006-03-30 |
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