EP1455372A1 - Relay with core having partly enlarged cross section - Google Patents

Abstract

A partition plane (26) extends between first (19) and second (20) core elements in a coil's lengthwise direction (L) parallel to a yoke (3). Interlayered surfaces are made as flat and smooth as possible on the parting plane as well as on a buffer surface (27) between a cross-sectional enlargement (22) and the yoke. This avoids air gaps in transitional areas and losses in magnetic flux.

Description

The invention relates to a relay with a coil former, the coil former penetrating core and a yoke.

Relays with these features are known, for example, from EP-A-202 651, EP-B-363 176, EP-B-691 667 and DE-C-42 32 228 are known.

With all these relays, the coil body, the core and the yoke form a magnet system, that causes a switching process when the coil is excited. In the course of the switching process, when the coil is excited, a magnetic switching force is generated, which Anchor moves. The movement of the armature is transmitted to a contact spring that then contacts close or open.

A disadvantage of the relays known from the prior art are only partially low switching forces or large designs with high switching forces.

The invention is therefore based on the object of a relay of the type mentioned to be improved in such a way that large switching forces are achieved with a small construction volume.

This task is solved for the relay mentioned at the outset in that the cross-sectional area of the core in the area of the transition to the yoke is larger than that of the central region of the core which surrounds the coil former.

This solution is structurally simple and leads to smaller designs of the relay constant high switching force.

According to the invention, the central region of the core, which is surrounded by the coil former has a reduced cross-section, which offers space for additional coil windings, so that the coil can generate a higher magnetic force. In the transition area on the other hand, the cross section between the yoke and the core is expanded, so that a high magnetic flux can be conducted from the core to the yoke. Both measures that Cross-sectional expansion in the transition area between core and yoke and the reduction in cross-section and the increased winding space for the bobbin mutually optimal when generating a higher shifting force.

The performance of the relay, which has been improved in this way, can be mutually advantageous further developments are increased, as described below are explained.

If, for example, the end face of the core facing away from the yoke forms a pole face, which cooperates with a movable anchor can, according to an advantageous Further development of the invention, the surface area of the pole face may be larger than the cross-sectional area in the middle of the core. Due to the enlarged pole area, a high one appears Magnetic flux on the armature, resulting in high switching forces and fast switching operations guaranteed.

The core can also be tapered in a further development in the area of the coil former so that large cross-sectional areas for a Conduction of the magnetic flux with low losses are available and at the same time in the area of the taper space for additional windings of those held by the coil former Coil is provided.

The assembly of the core in the bobbin can be done by a number of independent Further training can be simplified.

For example, the core can be formed from at least two core elements. The Core elements can be designed to be inserted one after the other into the trace body, so that despite the cross-sectional expansion, easy assembly is possible, even when the cross-sectional expansion of the core engages behind the coil former.

At least two core elements can expand the cross-section towards the yoke exhibit; Furthermore, at least two core elements can expand the cross-section have to the pole face.

In order to facilitate the assembly of the core in the coil body despite the cross-sectional expansion, a core element can essentially be inserted into the coil former be designed. In particular, the core element can already be in the coil former inserted further core element can be inserted.

The assembly of the core element can also be facilitated in that at least a core element is essentially designed without undercuts or in Is essentially cuboid. This configuration facilitates in particular inserting the core element into the coil former.

The core can also consist of a plurality of transverse to the longitudinal extension of the bobbin core elements arranged side by side exist due to the power losses be minimized when switching the excitation current of the coil on and / or off. The Core elements can be pre-assembled in this embodiment.

Furthermore, the core or at least one core element can be configured in one piece with the yoke be the losses in the transition of the magnetic flux from the core to to keep the yoke as low as possible and to reduce the assembly effort.

Around the bobbin and yoke as efficiently as possible as a one-piece module during the assembly process To be able to assemble one piece with at least one core element trained yoke this core element can be inserted into the coil body be trained. As a result of this measure, the module unit consisting of the coil former and Completed yoke by simply pushing the yoke into the coil body. Only the core element provided with the cross-sectional expansion must be inserted before of the core element on the yoke can be inserted into the coil former.

To minimize the loss of magnetic flux from the core to the yoke, At least one core element can at least touch the yoke so that the Air gaps penetrated by the magnetic field are as small as possible or nonexistent.

In the following, the invention will be exemplified using various embodiments explained with reference to the accompanying drawings. The in the individual embodiments different features can be combined independently of each other be, as is already the case with the individual advantageous embodiments was set out.

Fig. 1

eine Ausführungsform eines Relais in einer schematischen Perspektivansicht;

Fig. 2

eine Ausführungsform eines Spulenkörpers mit Kern und Joch in einer schematischen Perspektivansicht;

Fig. 3

den Kern und das Joch der Ausführungsform der Fig. 2 in einer schematischen Perspektivansicht;

Fig. 4

eine Ausführungsform eines Kernelements in einer schematischen Perspektivansicht;

Fig. 5

eine weitere Ausführungsform eines Kernelements in einer schematischen Perspektivansicht;

Fig. 6

eine weitere Ausführungsform eines Kernelements in einer schematischen Perspektivansicht;

Fig. 7

eine Ausführungsform eines Spulenkörpers in einer schematischen Perspektivansicht;

Fig. 8

den Spulenkörper der Fig. 7 in einer Ansicht von Pfeil VIII; und

Fig. 9

eine Ausführungsform eines Spulenkörpers mit eingesetztem Kernelement in einer schematischen Perspektivansicht.

Show it:

Fig. 1

an embodiment of a relay in a schematic perspective view;

Fig. 2

an embodiment of a coil former with core and yoke in a schematic perspective view;

Fig. 3

the core and the yoke of the embodiment of Figure 2 in a schematic perspective view.

Fig. 4

an embodiment of a core element in a schematic perspective view;

Fig. 5

a further embodiment of a core element in a schematic perspective view;

Fig. 6

a further embodiment of a core element in a schematic perspective view;

Fig. 7

an embodiment of a bobbin in a schematic perspective view;

Fig. 8

the bobbin of Figure 7 in a view from arrow VIII. and

Fig. 9

an embodiment of a coil former with an inserted core element in a schematic perspective view.

First, the general structure of a relay will be described with reference to FIG. 1.

A relay 1 has a coil wound on a coil former 2 (not in FIG. 1) shown), a yoke 3 and a core passing through the coil former 2 (in FIG. 1 not shown). The yoke 3 ends in a pole face 4, which is connected to a working air gap 5 borders. In other configurations, the pole face 4 can also be formed on the core his.

The working air gap 5 is arranged between the pole face 4 and a movable armature 6. The armature 6 is via a connecting element guided along the coil body 2 7 connected to a contact spring 8 in a motion-transmitting manner, so that a Movement of the armature 6 inevitably leads to a movement of the contact spring 8.

The contact spring 8 is in turn between two in the direction of movement Contact spring spaced contacts 9, 10 arranged, preferably each can only touch one of the two contacts 9, 10. The contact spring is usually 8 biased so that they are against one of the contacts, for example the contact 10 is present.

If an excitation current is passed through the coil, a magnetic force arises at the pole face 4, which attracts the armature 6 and tries to reduce the working air gap. Thereby the armature 6 moves out of its rest position. About the connecting element 7 transfer this movement to the contact spring 8. This causes the contact spring to move 8 also out of its rest position and is pressed against the contact 9.

The contacts 9, 10 and the contact spring 8 are each with outside of the relay guided contact pins 11, 12, 13 provided. The contact pins 11, 12, 13 can each to be present in pairs.

The contacts 11, 13 and 11, 12 are dependent on the position of the contact spring 8 closed. For example, the contact spring is in the rest position shown in FIG. 1 8 the contacts 11 and 12 via the contact spring 8 and the contact 11 with each other connected.

In order to create defined contact points on the contacts 9, 10 and the contact spring 8, can contact pills 14, 15, 16 on the contacts 9, 10 and / or the contact spring 8 may be provided.

In Fig. 2 is an embodiment of the coil body 2 with the yoke 3 and the Coil penetrating core 17 shown, the direction of view obliquely to the pole face 4 is directed.

For the sake of clarity, the coil extends from the coil body 2 in the circumferential direction extending recess 18 is held, omitted in Fig. 2.

As can be seen in Fig. 2, the core 17 has two core elements 19, 20 which are transverse lie perpendicular to each other in the direction of the coil.

The core 17 protrudes from the coil body 2 in the longitudinal direction of the coil body 2.

In Fig. 3 the yoke 3 and the core 17 in the perspective of Fig. 2 with removed Coil body 2 shown.

It can be seen that the one core element 20 is formed in one piece with the yoke 3 while the other core element 19 abuts the yoke 3 and the core 20. To the Anchors, on the end face 21 of the core 17, close both core elements 19, 20 flush to form a substantially flat end face 21, which is also called a pole face 4 can serve.

One of the core elements 19, 20, in the embodiment of FIG. 3 in one piece with the yoke formed core element 20 is substantially cuboid and has no protrusions and / or undercuts.

The other, separate core element 21 is in the longitudinal direction L of the coil on the respective End faces provided with cross-sectional extensions 22, 23. The cross-sectional extensions 22, 23 engage behind the bobbin 2.

The cross section is in the central region of the core 17, which is surrounded by the coil former 2 of the core with respect to the two end regions located in the longitudinal direction of the coil former reduced. This creates a recess 25, which serves as an additional winding space can be used for the coil so that the coil has a higher number of windings and / or density.

If the core 17 does not border on the working air gap 5 of the relay 1, the can also on the Cross-sectional expansion 23 are dispensed with, although this causes the flow of the magnetic field is affected by the core in the anchor; of course, the one from yoke 3 formed pole face 4 have a cross-sectional expansion.

As can also be seen in FIG. 3, the parting plane 26 extends between the two Core elements 19, 20 in the longitudinal direction L of the coil parallel to the yoke 3. At the Parting plane 26, as well as on the stop surface 27 between the cross-sectional expansion 22 and the yoke 3, the superimposed surfaces are as flat and as possible smoothly formed. This creates air gaps in the transition areas and losses avoided in the magnetic flux.

FIGS. 4 to 6 show further embodiments of the core element 20. In all of these core elements 20, the cross section of the two is in the longitudinal direction Ends 22, 23 in a cross-sectional plane perpendicular to the longitudinal direction L of the Coil expanded.

The cross-sectional plane Q is shown schematically in FIG. 4 once in the central region as the cross-sectional plane Q ₁ and once in the end region as the cross-sectional plane Q ₂ . As can be seen, the area of the cross section Q _{2 is} larger than the area of the cross section Q ₁ .

The core element 20 of FIG. 4 is rationally made from one piece and has bent over Ends 22, 23 on. By extending over the entire width of the core element 20 extending recess 28 in the vicinity of the bending radius 29, the bending process is facilitated.

5 shows a core element 20, which consists of several individual elements 20a, 20b, ..., which are arranged side by side, is constructed. The number of side by side arranged and preferably touching core elements 20a, 20b, ... is any, in Fig. 5 only four elements lying next to each other are shown as an example. The cross-sectional areas or contours of the individual core elements 20a, 20b, ... in a plane lying in the longitudinal direction L are the same. To the core element 20 in the 5 are easy to handle, the core elements 20a, 20b, ... connected to one another in one piece, for example glued, soldered or welded.

6 is an embossed part from a Metal material, in which the two cross-sectional extensions 22, 23 in the form of in Longitudinal direction L of the coil oblique, embossed ramps designed are. Alternatively, the core element 20 can also be produced by injection molding.

7 shows the coil former 2, the core 17 and the yoke 3 being omitted are. The bobbin 2 has an extending in the longitudinal direction L of the coil Passage 30, which is open on both sides.

In the central region 31 of the coil body 2, which has the recess 18 for the coil essentially coincides, the clear cross section is in a plane perpendicular to Longitudinal direction L of the passage 30 is reduced to accommodate additional coil windings to accomplish. To the two ends of the bobbin 2 extends Passage 30 in an area 32. The shape of the area 32 is based on the shape of the respective cross-sectional extension 22, 23 adapted so that the core element 20 with the cross-sectional extensions 22, 23 can be accommodated in the passage 30. The cross section of the passage 30 is dimensioned at its smallest point so that the cross-sectional expansion 22 of the core element 20 still through the passage 30 can be inserted. In the inserted state, the cross-sectional extensions reach behind 22, 23 the coil former 2, so that the core element 20 essentially is held immovably by the bobbin.

As in FIG. 8, in which the coil former 2 of FIG. 7 is shown in viewing direction VIII, to can be seen, the cross-sectional expansion of the passage 30 at the two open Ends be configured differently, for example at one end flush termination of the core with the bobbin 2 and at the other end to allow the core 17 to protrude.

The passage 30 is designed such that when the core element 20 is inserted with cross-sectional enlargements 22 and 23 a extending through the bobbin 2 Free space 33 of essentially constant clear width remains. In the free space 33 can the other core element 19, 20 after insertion of the other Core element 19, 20 are inserted. Due to the cross-sectional extensions 22, 23 held, the one core element 20 can no longer be removed from the passage 30 be as long as the other core element 19 is used. By a press fit of the Core element 19, the core can be held firmly in the coil former. For this is the Cross section of the core element 19 is slightly larger than the cross section of the free space 33.

The assembly process of a relay according to the invention is briefly described below.

First, the core element 20 is inserted into the relay, which with at least one Cross-sectional extension 22, 23 is provided. As soon as the cross-sectional extensions 22, 23 is included in the extension 32 of the passage assigned to it, this will be other core element 19, 20 inserted into the free space 33.

Depending on whether the cross-sectional extensions 22, 23 in one piece on the yoke 3 or on separate core element 19 are formed, the yoke 3 or the core element 19 placed in the passage 30. Then it becomes essentially cuboid Core element 19 inserted.

Claims (13)

Relay (1) with a coil former (2), a core (17) passing through the coil former (2) and a yoke (3), characterized in that the cross-sectional area (Q ₂ ) of the core (17) in the region of the transition to the yoke (3) is larger than in the central region (31) of the core (17) surrounded by the coil former (2). Relay (1) according to claim 1, characterized in that the cross-sectional area (Q ₂ ) on the end face of the core (17) facing away from the yoke (3) is larger than the cross-sectional area (Q ₁ ) in the central region (31) of the core (17 ). Relay (1) according to claim 1 or 2, characterized in that the core (17) is tapered in the region of the coil former (2). Relay (1) according to one of the above claims, characterized in that the core (17) is formed from at least two core elements (19, 20; 20a, 20b, ...). Relay (1) according to one of the above claims, characterized in that a core element (20) is designed to be essentially insertable into the coil former (2). Relay (1) according to one of the above claims, characterized in that a core element (20) is designed to be substantially free of undercuts. Relay (1) according to one of the above claims, characterized in that the yoke (3) is formed in one piece with one of the core elements (19, 20). Relay (1) according to one of the above claims, characterized in that the core element (19, 20) provided in one piece on the yoke (3) is essentially cuboid. Relay (1) according to one of the above claims, characterized in that the core element (19, 20) which is provided in one piece on the yoke (3) is designed to be insertable into the further core element (19, 20) inserted in the coil former. Relay (1) according to one of the above claims, characterized in that at least two core elements (19, 20; 20a, 20b, ...) are provided, the cross section (Q ₂ ) of which is widened towards the yoke (3). Relay (1) according to one of the above claims, characterized in that at least two core elements (19, 20; 20a, 20b, ...) are provided, the cross-section (Q ₂ ) of which is widened towards the pole face (4). Relay (1) according to one of the above claims, characterized in that the at least one core element (19, 20) touches the yoke (3). Relay (1) according to one of the above claims, characterized in that the at least one cross-sectional extension (22, 23) engages behind the core (17).

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