EP1280982A1 - Actionneur electromagnetique de soupape - Google Patents
Actionneur electromagnetique de soupapeInfo
- Publication number
- EP1280982A1 EP1280982A1 EP01931817A EP01931817A EP1280982A1 EP 1280982 A1 EP1280982 A1 EP 1280982A1 EP 01931817 A EP01931817 A EP 01931817A EP 01931817 A EP01931817 A EP 01931817A EP 1280982 A1 EP1280982 A1 EP 1280982A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator rod
- valve stem
- actuator
- spherical cap
- ball
- 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
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
- 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 made to electromagnetic actuators intended to move in axial translation a valve to bring it alternately in an open position and in a closed position. It finds a particularly important application in the control of the valves of an internal combustion engine, ignition either by sparks or by compression.
- the actuator 10 consists of an assembly intended to be mounted on the cylinder head 12 of an engine. It may include a housing made up of several pieces 14 and 16 stacked and assembled by means not shown, such as screws. These parts are made of non-ferromagnetic material, for example a light alloy. The housing can be fixed to the cylinder head 12 by means of a shim 20 also made of non-ferromagnetic material.
- the actuator comprises a pallet 22 made of ferromagnetic material, advantageously laminated to reduce losses, fixed on an actuator rod 24 intended for driving the valve 25.
- a pallet 22 made of ferromagnetic material, advantageously laminated to reduce losses, fixed on an actuator rod 24 intended for driving the valve 25.
- the actuator rod 24 can be fixed to the pallet by welding and be guided by a ring 26 fixed to an annular extension of the part 16.
- the stem 32 of the valve 25 is distinct from the stem 24 and located coaxially in the extension of the latter. It is guided by a ring 29 fixed to the cylinder head and can rotate in the latter.
- Two return springs 28a and 28b are provided to keep 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 28a 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 fixed 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 guarantees sealing.
- each cup 30, 31 is rigidly mounted respectively on the actuator rod 24 and the valve stem 32.
- each cup has a conical bore 35 diverging towards the end of the rod 24 and of the tail 32 and is force-fitted onto a conical ring 36 integral with the stem 24 and the tail 32 (for example formed by two half-rings assembled on either side of the stem 24, respectively of the tail 32 and retained thereon by a set of mutually interlocking annular grooves and ribs).
- the springs 28a and 28b are formed in the form of helical springs, in particular helical coil springs whose end of small diameter is supported on the corresponding cup 30, 31 respectively. Therefore, 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. It follows that the bearing force of the spring is not strictly symmetrical around the periphery of the cup. The consequence is that the force of the spring on the cup is broken down into an axial thrust component and into 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 asymmetrical friction at 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) generates vibration, noise and wear of the friction parts.
- the two cups have an axial central cavity in the form of a spherical cap suitable for receiving a ball in a spherical cap of complementary shape which is integral with the actuator rod or the valve stem as taught in document DE-A-198 40 578.
- the actuator rod or the valve stem and its associated cup are partially separated, so that the latter can, under the action of the transverse force component communicated by the spring, take all desired inclination relative to its support.
- This inclination can vary in angle and in radial direction at the rate of the variation in compression of the spring.
- the actuator rod or the valve stem is no longer rigidly secured to the spring and is no longer subjected to the component of transverse force. generated by it, so that it slides in the corresponding guide ring perfectly coaxially. This eliminates a cause of rapid wear of the parts in relative sliding and eliminates a source of vibration and noise.
- the object of the invention is essentially to propose an improved arrangement of the device described above which eliminates such a risk.
- an electromagnetic valve actuator having a pallet integral with a movable actuator rod substantially axially to cooperate functionally with a valve stem which is substantially in extension and coaxial with said actuator rod and movable substantially axially
- elastic return means comprising helical springs associated coaxially respectively with said actuator rod and with said valve stem and being arranged to keep said valve at rest in a middle position between fully open and closed positions, said helical springs being, on the side of the cooperating ends of said actuator rod and of said valve stem, bearing on cups which are integral respectively with said actuator rod and valve stem, the two cups having an axial central cavity in the form of spherical cap suitable for receiving a ball joint in cap spherical of complementary shape which is integral with the actuator rod or the valve stem
- the invention proposes that the spherical cap surface of the cavity of the cup and / or of the ball joint be hollowed out with radial grooves separating sectors of a spherical cap, so that a lubricating agent can be easily
- the ball-joint in the form of a spherical cap is a ring coaxially attached to the end of the actuator rod or of the valve stem, with in this case the possibility that the ball forming a spherical cap-shaped ring has a conical central bore and is blocked on the end of the actuator rod or of the valve stem by a conical ferrule itself fitted on said end.
- the ball-joint in the form of a spherical cap is constituted in the form of two half-rings assembled, with axial locking, on either side of the end of actuator rod or valve stem.
- the invention finds a particularly advantageous application when the coil springs are volute springs whose end of small winding diameter is supported on the respective cups, because it is in the case of such volute coil springs that the transverse component is the most important.
- FIGS. 2 to 4 are partial views, in section and on an enlarged scale, respectively showing three embodiments of an articulated coupling of a cup and an actuator rod in which the invention can find application; and
- FIG. 5 is a schematic perspective view of the external surface of a ball joint implemented according to the invention in the arrangements of FIGS. 2 to 4.
- FIGS. 2 to 4 show more particularly the articulated coupling between the cup 30 and the actuator rod 24, it being understood however that a coupling of the same kind is also implemented between the cup 31 and the valve stem 32 having regard to the fact that the valve stem 32 is subjected to the same effects as the actuator stem 24 for the same causes.
- the cup 30, for its part has an axial central cavity 39, open in the direction of the valve stem, the surface 40 of which is in the form of a spherical cap (concave surface) complementary to the convex surface of the terminal part 37 of the actuator rod 24.
- the cup 30 is held in abutment on the massive end part 37 simply by the spring 28a, and the ball thus formed allows an omnidirectional rotary movement of the cup 30 relative to the rod 24, thus freeing the latter from the effects of the component. transverse due to spring 28a.
- the cup 30 is, as in FIG. 2, provided with a cavity with a surface 40 in a concave spherical cap, while the surface in the form of a convex spherical cap 38 is provided on an annular ring 41 which is secured to the end of the rod actuator 24 by means of a conical ring according to the same type of mounting as illustrated in FIG. 1 for the attachment of the cup 30 directly to the rod 24.
- the ring 41 has a conical bore 42 by which it is force fitted on a conical ring or ferrule 36 integral with the actuator rod 24.
- the conical ring 36 can be formed of two half-rings assembled around the rod 24 and axially locked on this one i by a set of groove (s) and projection (s) provided on the respective cooperating and mutually nested faces.
- a set of groove (s) and projection (s) provided on the respective cooperating and mutually nested faces.
- FIG. 4 structurally combining the two rings 41 and 36.
- the ring 41 with a convex spherical external surface 38 is replaced by a ring 42 made up of two half-rings 43 which have a central recess provided with a set of groove (s) and / or projection (s) capable of cooperating by interlocking with those complementary to the actuator rod 24.
- the convex spherical external surface 38 of one or other of the aforementioned embodiment is hollowed out with grooves 44 of radial extent which facilitate the supply of lubricant between the surfaces rubbing 38 and 40.
- the presence of such grooves 44 reduces the contact area of the rubbing surfaces which are reduced to shell sectors 45, and therefore reduces friction.
- grooves can likewise be provided in the concave spherical surface 40 of the cup 30.
- grooves 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)
Abstract
Description
Claims
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 true EP1280982A1 (fr) | 2003-02-05 |
EP1280982B1 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 AU AU58510/01A patent/AU5851001A/en not_active Abandoned
- 2001-05-07 ES ES01931817T patent/ES2234839T3/es not_active Expired - Lifetime
- 2001-05-07 DE DE60108494T patent/DE60108494T2/de not_active Expired - Fee Related
- 2001-05-07 EP EP01931817A patent/EP1280982B1/fr not_active Expired - Lifetime
- 2001-05-07 WO PCT/FR2001/001389 patent/WO2001086123A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0186123A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001086123A1 (fr) | 2001-11-15 |
DE60108494D1 (de) | 2005-02-24 |
DE60108494T2 (de) | 2006-03-30 |
FR2808859A1 (fr) | 2001-11-16 |
AU5851001A (en) | 2001-11-20 |
EP1280982B1 (fr) | 2005-01-19 |
FR2808859B1 (fr) | 2003-01-17 |
ES2234839T3 (es) | 2005-07-01 |
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