WO2000033330A1 - Electromagnet with a plastic housing, especially for an electromagnetic actuator - Google Patents
Electromagnet with a plastic housing, especially for an electromagnetic actuator Download PDFInfo
- Publication number
- WO2000033330A1 WO2000033330A1 PCT/EP1999/009230 EP9909230W WO0033330A1 WO 2000033330 A1 WO2000033330 A1 WO 2000033330A1 EP 9909230 W EP9909230 W EP 9909230W WO 0033330 A1 WO0033330 A1 WO 0033330A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- yoke body
- electromagnet
- housing
- pole face
- Prior art date
Links
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
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1638—Armatures not entering the winding
-
- 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
- H01F7/081—Magnetic constructions
Definitions
- Electromagnet with plastic housing especially for an electromagnetic actuator
- Electromagnetic actuators for actuating an actuator in particular electromagnetic actuators for actuating gas exchange valves on piston engines, have to be mass-produced in large quantities and therefore also inexpensively.
- DE-A-198 25 728 is an electromagnetic actuator for actuating an actuator, which is connected to an armature that is movably guided against the force of at least one return spring, and with two electromagnets each having a pole face, each in a partial housing are made of metallic material, which is provided with an opening which is at least open in the direction of the armature and into which there is a recess provided with a coil
- Yoke body is used, the surface facing the armature forms the pole face, and which is arranged in mirror image to the other part of the housing.
- the object of the invention is to design the electromagnets required for the electromagnetic actuator in such a way that they are easier to manufacture but can also be used for a wide variety of applications.
- an electromagnet for an electromagnetic actuator for actuating an actuator which has a yoke body with a pole face and a guide for a guide pin oriented perpendicular to the pole face, and with groove-shaped recesses in the pole face, into which a coil is inserted, and with a housing-like cover made of plastic, which covers at least part of the outer surface of the yoke body.
- An electromagnet designed in this way has The advantage is that the yoke body, in particular a laminated yoke body with relatively large dimensional deviations, can be inserted into an injection mold and that the housing-like cover of the yoke body can be manufactured with exact external and connection dimensions of the housing despite the dimensional deviations.
- housing-like plastic cover the yoke body only over one is particularly advantageous . Covers part of its outer surface so that, for example, two side surfaces of the yoke body remain free. This on the one hand a secure fixation of the yoke body in the injection mold is possible and on the other hand ensures that the heat loss of the coil occurring during operation can be radiated to the outside.
- the plastic used is a temperature-resistant plastic that can withstand the temperatures of around 100 - 300 ° C, which are usually found on the cylinder head of a piston internal combustion engine or a piston compressor, and possibly also temperatures of up to -30 ° C when compressing refrigerants.
- injectable thermosets is advisable.
- the chemically reactive properties of the medium to be compressed in relation to the plastic must be taken into account when selecting such actuators on piston compressors.
- Thermosetting polyester resins cannot be used in reciprocating compressors to compress NH 3 as a refrigerant or the like.
- sprayable thermosets is indicated here.
- Sub-areas are integrally connected. This makes it possible to insert the yoke body with the pre-assembled coil into the injection mold, so that in a single “shot”, The outer covering of the yoke body and the covering covering of the coil pre-assembled in the yoke body can thus be carried out in one operation.
- the coil is fixed in the recesses of the yoke body by the inflowing plastic and at the same time firmly connected to the housing-like cover of the yoke body.
- the insertion of the coil into the groove-shaped recesses of the yoke body can be mechanized, so that the "casting" of the coil and the connection of the yoke body to a "housing" can be carried out in one operation.
- the injected plastic also forms additional electrical insulation of the coil from the yoke body.
- the surface of the plastic covering the coil in the recesses is a predetermined amount below the plane of the pole face. This ensures that despite the higher coefficient of thermal expansion of the plastic compared to the yoke body made of sheet iron, even at the maximum permissible maximum temperature of the coil, the coil with its covering plastic cover can not "grow out" of the groove-shaped recesses and thus always a full surface Installation of the anchor on the pole face is guaranteed.
- the housing-like cover is connected to a spacer frame which projects beyond the pole face and surrounds in the region of the outer circumference.
- This spacer frame can be produced as a separate component and then inserted between the two electromagnets when assembling electromagnets to form an actuator.
- This spacer frame can be made of plastic or of another material, for example aluminum.
- the spacer frame is integrally connected to the housing-like plastic cover of the yoke body, ie in one operation together with the housing-like cover and the cover surrounding the coil is made of plastic.
- the arrangement of the spacer frame, which surrounds the movement space of the armature, has the advantage that the direct radiation of airborne sound from the armature space is reduced, which occurs when the armature is reefed onto the pole face.
- Another advantage is that the side edges of the spacer frame each rest directly on the edges of the yoke body.
- the yoke bodies are each formed from a laminated core composed of a large number of individual sheets, the two yoke bodies are braced directly over their longitudinal edges via the two electromagnets braced against one another, so that the individual sheets are still supported. This prevents the deflection of the two yoke bodies and thus significantly improves the fatigue strength of the components which are heavily stressed by the armature movement and the impact of the armature on the one hand and by the magnetic forces on the other.
- the housing-like cover can be provided with a drainage line in the form of a bore or the like in order to cause leakage quantities to flow out of the movement space of the armature, for example into the suction area of the cylinder.
- At least one contact fitting connected to the coil is provided, which is firmly embedded in the plastic of the housing-like cover.
- the coil can then already be provided with the contact fittings for production and then inserted with its contact fittings into the groove-shaped recesses of the yoke body in the injection mold and also fixed by the injection mold.
- the contact fittings are then integrated into the plastic of the housing-like cover, so that a component ready for connection can be produced.
- connection element is molded and / or molded on the outside of the housing-like plastic cover of the yoke body.
- a tubular extension can be provided as the connection element, which has an internal thread, so that a support and adjustment housing for a return spring can be screwed in.
- the internal thread can be molded directly into the plastic or embedded in the surrounding plastic in the form of a separate threaded sleeve made of metal.
- Such an embodiment is to be provided on the upper side, for example, of an electromagnetic actuator for actuating a gas exchange valve on an internal combustion engine, the return spring then having the function of an opening spring.
- connection fitting can also be provided one or more bores penetrating the housing-like plastic cover, which serve as feed and / or discharge for a lubricant.
- a channel can also be provided as a pressure medium supply for hydraulic valve lash compensation.
- a collar-shaped extension can also be provided as the connecting element, via which the electromagnet can be connected to the components assigned to it on its side facing the actuator to be actuated.
- the collar-shaped attachment can be formed directly by a corresponding shaping of the housing-like plastic cover of the yoke body.
- Receiving hole is fixed in the yoke body, preferably glued.
- This embodiment has the advantage that the connection between the yoke body and the guide sleeve can be carried out in a "cold" manufacturing process.
- the lubricant impregnation of the sliding sleeves unlike soldering, cannot impair the gluing, since the outer surface of the guide sleeve can be degreased for the gluing process with sufficient reliability.
- Yoke body adversely affected with plastic.
- the invention is explained in more detail with reference to schematic drawings for an embodiment. Show it:
- Fig. 1 in a vertical section an electromagnetic actuator for actuating a gas exchange valve acc. the line I-I in Fig. 2,
- Fig. 2 shows a section. the line II-II in Fig. 1,
- Fig. 3 is a perspective view of the pole face of an electromagnet.
- the electromagnetic actuator shown in FIG. 1 is essentially formed from two electromagnets 1 and 2, which are arranged at a distance from one another via a spacer frame 3 and are aligned with one another with their pole faces 4.
- the shape of the spacer frame 3 is shown in a perspective top view in FIG. 3.
- An armature 5 is arranged in the movement space 3.1 enclosed by the spacer frame 3 between the two pole faces 4, said armature being guided in a guide 7 so that it can be moved back and forth via a guide pin 6.1.
- the armature 5 has a rectangular basic shape.
- the armature 5 is connected via a guide pin 6.2 with a return spring 8.
- the other, lower free end 9 of the guide pin 6.1 is supported on an actuator, for example the free end of the shaft 11 of a gas exchange valve, which is guided in the cylinder head 12 of a piston engine, which is only indicated here.
- the gas exchange valve is acted upon in the closing direction by a return spring 13, the return spring 13 and the return spring 8 being directed towards each other in their direction of force, so that when the electromagnets are de-energized, the armature 5 correspondingly corresponds to its rest position between the two pole faces 4 of the two electromagnets 1 and 2 occupies like this is shown in Fig. 1.
- the two electromagnets 1 and 2 are firmly connected to one another via a connecting means, not shown, for example tensioning screws.
- the actuator thus formed is accordingly firmly connected to the cylinder head 12.
- the electromagnetic actuator shown in FIG. 1 represents a structural unit that is assembled in modular form.
- the two electromagnets 1, 2 each consist essentially of two electromagnets 1 and 2, which are directed towards one another with their pole faces 4.
- the two electromagnets 1 and 2 each have a cuboid-shaped yoke body 16 which is composed of a large number of individual sheets which are firmly connected to one another, for example by
- the individual sheets of the yoke body 16 run transversely to the extent of the recesses 19.
- the yoke body 16 is here provided with two parallel groove-shaped recesses 19, into which a coil 17 shaped as a rectangular ring with two parallel legs is inserted.
- the yoke body 16 is provided with a housing-like cover 20.
- This can consist of metal, for example aluminum.
- a housing-like cover 20 made of a plastic is described below.
- FIGS. 1 and 2 in the case of the cuboid basic shape of the yoke body 16, the end faces which are encompassed by the coil 17 are inclusive the coil 17 completely embedded in a thick-walled plastic. Only the long sides of the yoke body remain free, as can be seen from FIGS. 2 and 3.
- the coil 17 is produced and enclosed with plastic in one operation, both in its area encompassing the end region of the yoke body 16 and in the area of the groove-shaped recesses 19 penetrating it in the longitudinal direction of the yoke body, the coil 17 is not only in the region of the groove-shaped recesses 19 , as would be the case with a conventional casting, but also fixed in the area of the end face with the yoke body together in the housing-like cover 20.
- the yoke body 16 and the coil are embedded by inserting the yoke body with the preassembled coil into a corresponding injection mold, into which the plastic, preferably a sprayable thermoset, is then injected.
- Epoxy molding compounds which do not react on contact with NH 3 are well suited for the applications in question here, in particular for use with piston compressors for compressing NH 3 .
- the "casting" of the coil 17 in the groove-shaped recesses 19 with the simultaneous shaping of the housing-like cover takes place in such a way that, as can be seen from FIG. 2, the free surface 21 of the plastic covering the coil 17 in the recesses 19 around a predetermined dimension lies below the plane of the pole face 4, so that even when heated, the surface 21 cannot project beyond the plane of the pole face at any time.
- the necessary for a connection of the finished electromagnet to the power supply contact fittings 22, for example plug tongues, can already be contacted in the manufacture with the coil 17 and fixed accordingly in the injection mold, so that the contact fittings 22 also with the housing-like cover 20 by casting or injection molding are positively connected to the plastic.
- the housing-like cover 20 can be provided with one or more connection elements 23, which are expediently already molded on and / or molded into the plastic mass of the cover.
- a connection element 23 can be formed, for example, by a tubular add-on with an internal thread, into which a tensioning and adjusting housing 23.1 for the return spring 8 can later be screwed.
- the tensioning and adjusting housing can be connected to the housing-like cover in a sealed manner.
- the required internal thread can either be molded directly into the plastic or can be formed by an injection-molded metal threaded sleeve.
- one or more channels 24 for supplying and / or discharging a lubricant or also a pressure medium for actuating, for example, hydraulic valve lash compensation, and drainage lines for the movement space 3.1 for discharging leakage quantities when the actuator is connected to a piston compressor can also be provided as a connection fitting is used.
- the electromagnet 2 can then be provided with the connection elements 25 required for the connection to the cylinder head 12, for example in the form of a centering ring.
- this centering ring can be integrally molded directly onto the housing-like cover 20 of the electromagnet 2 or as an additional component, for example in the form of a metallic ring or a metallic base plate with a molded-on ring during the injection molding of the plastic cover Appropriate anchorages must be firmly connected to the plastic cover.
- Such a base plate is always of interest if the direct contact area between the cylinder head of the Internal combustion engine and with additional elements arranged in the inner region of the electromagnetic actuator, for example a hydraulic valve lash adjuster, a connection, for example in the form of a feed channel for introducing a pressure medium, or a drainage for leakage quantities is to be provided.
- additional elements arranged in the inner region of the electromagnetic actuator for example a hydraulic valve lash adjuster, a connection, for example in the form of a feed channel for introducing a pressure medium, or a drainage for leakage quantities is to be provided.
- the spacer frame 3 is provided as a separate component which can be made of a non-magnetic metal, for example aluminum or also of plastic. This spacer frame 3 is then clamped between the two electromagnets 1 and 2 braced against one another by the clamping means described above.
- the contact surface on the electromagnet 1 and on the electromagnet 2 is provided with a seal in order to seal the movement space 3.1 from the environment.
- FIG. 3 shows a perspective top view of an electromagnet.
- This supervision reveals that the essentially rectangular spacer frame 3 is thick-walled on its narrow sides and provided with through openings 26 for tensioning screws, via which the two electromagnets 1 and 2 are firmly connected to one another in the manner shown in FIG. 1.
- the longitudinal edges 3.2 of the spacer frame 3 are thin-walled, but lie directly on the outer edge on the pole faces 4 of the two yoke bodies 16, so that the individual sheets of the yoke body extending transversely to the longitudinal extent over the spacer frame
- the spacer frame is not provided as a separate component, but made of plastic and integrally connected to the housing-like plastic cover of the yoke body 16, so that the assembly effort for producing an actuator acc. 1 only an electromagnet with a molded di- Punching frame and an electromagnet are to be assembled without a molded spacer frame.
- the arrangement of a spacer frame is not limited to electromagnetic actuators which are composed of electromagnets with a plastic cover.
- the armature can also be longer than the laminated core of the yoke body 16 and can reach both in width and in length up to the inner wall of the spacer frame 3.
- Appropriate contouring of the edges resting on the yoke body and the adjoining surfaces of the housing part also makes it possible to create pneumatic impact damping. This can be done, for example, by providing a projection 25 projecting into the movement space, the clear internal dimensions of which are only slightly larger than the external dimensions of the armature 5, so that in the immediate vicinity of a pole face 4, the one between the pole face on the one hand and the facing face Air on the armature surface, on the other hand, is forced out through a defined gap before the armature can finally come into contact with the pole surface.
- the guide 7 in the exemplary embodiment shown here is formed by a guide sleeve 14, for example made of metal, into the two Sliding sleeves 15 for the guide bolts 6.1 and 6.2 are pressed in frictionally.
- the sliding sleeves 15 consist of a sintered material soaked with lubricant.
- This guide 7, formed from the guide sleeve 14 and sliding body 15, is glued into a correspondingly dimensioned central bore 7.1 in the yoke body 16 (FIG. 3).
- the outside diameter of the guide sleeve 14 on the one hand and the inside diameter of the bore 7.1 on the other hand are dimensioned in such a way that no pressure is present when the guide sleeve 7 is inserted, in order to prevent the yoke body 16 formed by a laminated core from being driven apart.
- the design of the guide 7 described above and its connection to the yoke body is also not limited to the embodiment of a plastic-coated electromagnet described above.
- This guide is also applicable to electromagnets in which a separate housing made of another material, for example made of aluminum, is provided instead of a housing-like cover 20 made of plastic.
- the embodiment described above is particularly advantageous for electromagnets with a housing-like cover 20 made of plastic, because the “bare” and thus fat-free yoke body can first be encapsulated with plastic and the guide sleeve can then be glued in place.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnets (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000585891A JP2003529913A (en) | 1998-12-03 | 1999-11-27 | Electromagnets with synthetic resin casing, especially for electromagnetic actuators |
DE19982576T DE19982576D2 (en) | 1998-12-03 | 1999-11-27 | Electromagnet with plastic housing, in particular for an electromagnetic actuator |
EP99959355A EP1060482A1 (en) | 1998-12-03 | 1999-11-27 | Electromagnet with a plastic housing, especially for an electromagnetic actuator |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998155730 DE19855730A1 (en) | 1998-12-03 | 1998-12-03 | Electromagnetic actuator with multipart housing for adjuster member in car industry etc. |
DE19855730.2 | 1998-12-03 | ||
DE1998159215 DE19859215A1 (en) | 1998-12-21 | 1998-12-21 | Electromagnet for electromagnetic actuator for operating setting element e.g. for operation of i.c. engine gas changing valves, has yoke body enclosed by plastics housing sheath fixing coil in grooved recesses in pole face |
DE19859215.9 | 1998-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000033330A1 true WO2000033330A1 (en) | 2000-06-08 |
Family
ID=26050528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/009230 WO2000033330A1 (en) | 1998-12-03 | 1999-11-27 | Electromagnet with a plastic housing, especially for an electromagnetic actuator |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1060482A1 (en) |
JP (1) | JP2003529913A (en) |
DE (1) | DE19982576D2 (en) |
WO (1) | WO2000033330A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008034408A1 (en) * | 2008-07-23 | 2010-01-28 | Kendrion Binder Magnete Gmbh | Electromagnetic device, has winding conductor formed from anodized aluminum, and control element adjustably arranged by electric current flowing in set of tape winders along longitudinal axis of control element |
WO2012089962A1 (en) * | 2010-12-30 | 2012-07-05 | Valeo Systemes De Controle Moteur | Electromagnetic device, and corresponding electromagnetic actuator |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0024995A1 (en) * | 1979-09-04 | 1981-03-11 | The Bendix Corporation | Improved electromagnetic solenoid actuator |
EP0025382A1 (en) * | 1979-09-04 | 1981-03-18 | The Bendix Corporation | Electromagnetic solenoid actuator |
DE3619779A1 (en) * | 1985-06-15 | 1986-12-18 | Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln | Electromagnetic drive |
GB2252675A (en) * | 1991-02-08 | 1992-08-12 | Diesel Tech Corp | Solenoid stator assembly for fuel injectors |
US5339063A (en) * | 1993-10-12 | 1994-08-16 | Skf U.S.A., Inc. | Solenoid stator assembly for electronically actuated fuel injector |
DE4428869A1 (en) * | 1993-08-06 | 1995-02-09 | Zexel Corp | Solenoid valve |
DE29712502U1 (en) * | 1997-07-15 | 1997-09-18 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Electromagnetic actuator with housing |
-
1999
- 1999-11-27 WO PCT/EP1999/009230 patent/WO2000033330A1/en not_active Application Discontinuation
- 1999-11-27 DE DE19982576T patent/DE19982576D2/en not_active Expired - Lifetime
- 1999-11-27 EP EP99959355A patent/EP1060482A1/en not_active Withdrawn
- 1999-11-27 JP JP2000585891A patent/JP2003529913A/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0024995A1 (en) * | 1979-09-04 | 1981-03-11 | The Bendix Corporation | Improved electromagnetic solenoid actuator |
EP0025382A1 (en) * | 1979-09-04 | 1981-03-18 | The Bendix Corporation | Electromagnetic solenoid actuator |
DE3619779A1 (en) * | 1985-06-15 | 1986-12-18 | Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln | Electromagnetic drive |
GB2252675A (en) * | 1991-02-08 | 1992-08-12 | Diesel Tech Corp | Solenoid stator assembly for fuel injectors |
DE4428869A1 (en) * | 1993-08-06 | 1995-02-09 | Zexel Corp | Solenoid valve |
US5339063A (en) * | 1993-10-12 | 1994-08-16 | Skf U.S.A., Inc. | Solenoid stator assembly for electronically actuated fuel injector |
DE29712502U1 (en) * | 1997-07-15 | 1997-09-18 | FEV Motorentechnik GmbH & Co. KG, 52078 Aachen | Electromagnetic actuator with housing |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008034408A1 (en) * | 2008-07-23 | 2010-01-28 | Kendrion Binder Magnete Gmbh | Electromagnetic device, has winding conductor formed from anodized aluminum, and control element adjustably arranged by electric current flowing in set of tape winders along longitudinal axis of control element |
WO2012089962A1 (en) * | 2010-12-30 | 2012-07-05 | Valeo Systemes De Controle Moteur | Electromagnetic device, and corresponding electromagnetic actuator |
FR2970108A1 (en) * | 2010-12-30 | 2012-07-06 | Valeo Sys Controle Moteur Sas | ELECTROMAGNETIC DEVICE AND CORRESPONDING ELECTROMAGNETIC ACTUATOR. |
Also Published As
Publication number | Publication date |
---|---|
EP1060482A1 (en) | 2000-12-20 |
DE19982576D2 (en) | 2001-03-08 |
JP2003529913A (en) | 2003-10-07 |
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