EP2466598B1 - Electromagnet with a connection area - Google Patents

Description

The invention relates to an electromagnet consisting of a coil which generates a magnetic field when electrical current flows through, a connection region for a current source, at least one current-carrying pin being arranged on the connection region.

Generic electromagnets are used for example as actuators for valves or the like. The connection area is formed, for example, by a plug-in contact. In the prior art, it is known a compound between the coil and the connection area or plug contact made by strands. In this case, the strands or small wires are soldered to the arranged on the connection area pin and connected in the same way with a solder connection to the wire which is wound on the spool. The coil thus comprises a bobbin carrying a plurality of wire windings.

The electrical contacting takes place in the installed state. This means that the individual components are installed in a housing of the electromagnet. The attachment of the electrical connection, for example, by a solder joint is relatively expensive and therefore costly. It is advantageous in the use of the stranded connection between the connection region or plug and the coil that this compound is relatively stable to vibration, that is, has a relatively high reliability, when the generic electromagnet is installed, for example, in arrangements that vibrate or vibrate.

The document JP 2973629 B2 ( Fig.2 ) discloses an electromagnet having a coil and a terminal region for a power source, wherein a live pin (110) is welded to a coil connector (109), the coil connector being connected to the coil. The current-carrying pin and the coil connector are cast in a solid part.

The document DE 10029279 discloses a magnetic coil with a consisting of an insulating material, substantially hollow cylindrical coil carrier which can be pushed onto a housing support and provided with at least two connection carriers and with a contact element.

The document US Pat. No. 6,680,666 B1 discloses a coil assembly having a coil and a coil terminal, wherein a coil wire is wound around the coil terminal.

The invention has set itself the task of providing an electromagnet, as described above, available, on the one hand inexpensive to produce, but on the other hand is reliable in operation.

To solve this problem, the invention proposes an electromagnet according to claim 1.

The invention hereby proposes several synergistically supporting individual measures:
On the coil, it is already known to use a coil connector, which connects, for example, by a solder connection coming from the plug wire. According to the invention, it is now proposed to connect the coil connector to the pin, which is also already present at the plug contact, plug or connection region (these terms are used interchangeably in the context of this application), by a welded connection. The welded connection is for example made by means of resistance welding or laser spot welding and is automated with high precision and quality and can therefore be carried out at favorable costs.

The use of a guide piece which can be plugged onto the pin has the advantage that the assembly of the electromagnet according to the invention is simple and reliable. The guide piece serves to clearly and reliably position the pin (s) (often the plug contact or connection area comprises several poles and therefore pins) and also to hold them in the correct position during the connection, that is to say during the welding. The guide piece serves to realize a reliable welded connection.

Usually, the connection area is formed by a plug connection. The plug-in connection or the plug-in contact is realized, for example, by the outside of the housing plane through the accurately fitting merging of two interacting elements, for example, the pin and a sleeve receiving the pin. In the context of the invention, the term pen is to be read on any connecting element which serves for the conduction of current and is not limited to a longitudinally extending configuration. For example, the pin in the plug contact can also be designed as a sleeve. It is clever that the provided in the connection area pin, if necessary, is extended and so to a the otherwise known strand replacing, current-conducting element. The consuming to be performed soldering process is replaced by the welding according to the invention, which is a highly stable and also fast to produce connection technology, which is partially or fully automated at the lowest cost feasible, for example. The term "pin" according to the invention thus also includes a sleeve or pipe.

The coil connector is sufficiently rigid or stiff to remain in the desired position during the assembly process and also subsequent welding.

The guide piece is attached in a suitable manner to at least one pin. Due to the adhesion between the guide piece and the at least one pin, there is a force coupling between the pin and the guide piece, whereby the pin is positioned by the guide piece in a suitable manner. In this case, the guide piece is aligned for example in a suitable manner in the electromagnet and / or fixed.

According to the invention, it is provided that the connection region, that is to say in particular the plug contact, is arranged in a housing of the electromagnet and the guide piece is supported on the housing. The electromagnet is surrounded by a housing. The connection area, which forms, for example, the plug-in contact, is arranged in the housing. The housing is optionally divided into several contiguous sub-housing and designed according to the invention so that the guide piece is supported on the housing. The support is again at least non-positively, if not even formed liquid, whereby the positioning of the at least one pin is supported by the guide piece.

In one embodiment of the invention, it is provided that the guide piece vibrationally stabilizes the at least one pin. The leader not only makes a significant Contribution to a cost-effective and reliable production of the electromagnet according to the invention, but sets in a suitable manner, the pin at its remote from the connection area (plug-in area) end. By this additional storage function, which meets the leader here, the entire assembly is additionally vibration stabilized and in particular the weld no longer mechanically stressed. By this configuration, the reliability of the entire electromagnet according to the invention is increased.

In one embodiment, it is provided that the guide piece has at least one opening and / or a recess for receiving the at least one pin and the opening or the recess has a slope and the pin has one or more bends in a Abwinkelbereich. To aufzustecken the guide piece on the at least one pin, one or more openings or recesses are provided on the guide piece. According to the invention, it is provided that the opening or the recess has one or more bevels. This bevel closes with the longitudinal extent of the pin a preferably acute angle, with the result that in a Aufsteckbewegung of the guide piece on the pin, the pin is thereby angled like a backdrop, which is why one or more bends arise in a Abwinkelbereich the pen.

It should be noted that the invention is not limited in terms of the number of recesses and openings in relation to the number of pins on the connection area or plug. So it is possible that not only a pin is passed through a breakthrough or the recesses, but also several pins. The guide piece not only causes the backdrop-like angling, but defines the ends of the pin (s) with respect to a rotational movement (rotational with respect to an axis of rotation parallel to the longitudinal, non-angled pins). This also facilitates the positioning of the pin just for welding to the coil connector.

Furthermore, it is provided according to the invention that the plugged-on guide piece presses a pin provided for earthing the housing against the electrically conductive housing. This makes it possible in a simple manner, to realize a grounding of the housing via a pin provided for this purpose of the connection area / plug contact. In addition, of course, a welding of the already pressed to the housing pin with the housing or a special supernatant, which serves for this, in a variant of the invention possible.

A rotary attachment of the guide piece or of the pin (s) as described above preferably takes place in a variant according to the invention by a positioning arrangement between the guide piece and the housing. The positioning arrangement is realized, for example, by the positive cooperation of a nose and a recess, which are respectively arranged on the guide piece or the housing. However, the positioning arrangement can also be formed in other ways, for example by a corresponding shaping of the outer contour of the guide piece and the cross section of the housing in which the guide piece is to be inserted.

In a variant it is provided that the pin (s) is / are longer than half, in particular longer than 70% of the coil length. The length of the pin is considered at least the length of the pin arranged in the housing. Typically, the pin penetrates the housing level in the plug and is outward for the formation of the plug contact led out. The invention comprises in this feature both solutions, that is, both the entire effective length of the pin inside and outside the housing, as well as the variant in which the length is considered only the length of the pin extending in the housing. The advantage of this feature is that the connection technology, ie the connection region or plug contact is arranged on one side of the electromagnet according to the invention. This arrangement can be made, for example, on the front, on which also the armature actuates a corresponding element, wherein the connection between the pin and the coil is at the back so that the other end of the coil. Therefore, the pin preferably extends parallel to the longitudinal axis of the coil, in particular from the front of the electromagnet, which is formed by the connection elements (armature opening and plug contact) to its rear side.

In one embodiment of the invention it is provided that the guide piece is designed as a plastic part, in particular as a plastic injection part. The guide piece is so cheap producible in large quantities.

As already stated, in one variant, the pin has both an area which runs in the housing and a region which can be arranged outside the housing. In this part, the pin is part of a connector, wherein the term "pin" also includes a sleeve-like configuration (as occurs in plug contacts) equivalent.

Advantageously, the coil connector is formed as a stamped part or as a stamped and bent part. The coil connector provides an electrically conductive connection between the wire of the coil and the pin and thus ultimately with the power supply, which is connected to the connection area or plug, is the embodiment of the coil connector as a stamped part or Stamped bent part ensures a very cost-effective production. The bobbin, on which the wire of the bobbin is wound, carries the bobbin connector, for which purpose, for example, a clamping or adhesive connection or the like is provided.

Cleverly, the pins, which penetrate the housing in the plug, initially arranged in parallel. Usually, a plurality of terminals and therefore also a plurality of pins are provided in the connection area. As far as the invention is described in terms of a pen, it does not limit the invention thereto, of course, several pins are included in the same way in the same way. The guide piece has not only the task to effect a corresponding positioning of the / of the pins, but also achieved, as described, a corresponding bending of the pin / pins in a suitable manner, for example, to make a protective earth contact with the housing or a corresponding Positioning of the pins with each other and in relation to the coil connector produce. It therefore follows that at least one pin is bent one or more times. Of course, a combination of non-angled and angled pins is also included in the invention.

In one embodiment of the invention it is provided that the coil connector has a length which is greater than 30% of the diameter of the coil. The coil connector is therefore significantly larger than just the pure pad and also has a power line function. It is preferably provided in particular that the coil connector is longer than 50% of the diameter of the coil. In particular, a length is preferred which is greater than 60% of the diameter of the coil, in special applications, a length of the coil connector of more than 75% of the diameter of the coil may be favorable. It turns out skillfully that the coil connector extends at least at an acute angle, preferably at a right angle to the coil axis, in particular on the coil axis.

The invention furthermore also includes a method according to claim 12 for the production of an electromagnet according to claim 1. The object stated at the beginning is solved in the same way also by the method according to the invention. The arrangement is preferably chosen so that the coil connector has a relatively large length, such that it connects the spatially distanced connection area with the coil. The sequence of steps is consistent and advantageous in that the guide piece provides for proper positioning of the pin or pins relative to the respective coil connectors. The inserted guide piece assists in the correct arrangement, especially in the subsequent welding, whereby the correct positioning favors a rapid welding and thus an unavoidable heat input in this area is considerably reduced. Cleverly, the guide piece is used so that a positioning of the pin relative to the coil connector takes place under a "bias" of the pin relative to the coil connector, so there is already an electrical contact, which is then stabilized by the welding.

In the manufacture of the connector having the pin (s), the pins are preferably made considerably longer. Cleverly, the pins are realized as straight running elements, where appropriate between these also other electronic components, such as resistors or diodes, can be provided, this depends on the particular Verschaltungsschema. In order to achieve an optimal positioning of the pin relative to the coil connector, the pin experiences when attaching the guide pin one or more bends.

In this connection, it is particularly pointed out that all the preferred features and properties described with respect to the electromagnet can also be applied mutatis mutandis with respect to the formulation of the method according to the invention and can be used within the meaning of the invention and be disclosed. The same applies in the opposite direction.

Fig. 1a, b, c

jeweils in einer seitlichen Ansicht, die Abfolge des erfindungsgemäßen Verfahrens zur Herstellung des erfindungsgemäßen Elektromagneten

Fig. 2

in einer dreidimensionalen Ansicht das Führungsstück gemäß der Erfindung

Fig. 3

eine Draufsicht auf den erfindungsgemäßen Elektromagneten nach Fig. 1c

In the drawing, the invention is shown schematically in particular in one embodiment. Show it:

Fig. 1a, b, c

each in a side view, the sequence of the inventive method for producing the electromagnet according to the invention

Fig. 2

in a three-dimensional view, the guide piece according to the invention

Fig. 3

a plan view of the invention Electromagnet after Fig. 1c

In the figures, the same or corresponding elements are denoted by the same reference numerals and therefore, if not appropriate, will not be described again.

In Fig. 1a, b, c an inventive solenoid 1 is shown schematically.

The connection region 3 is formed by a plug contact 30, this is formed by a plurality of pins 4, which penetrate the plug from outside to inside, that is in the housing 10. The pins 4a, b, c, d are arranged on the connection region 3. In the in Fig. 1a, b, c shown embodiment of the electromagnet 1 according to the invention, the connection portion 3 is arranged below, the pins 4 extend from the front (lower) end of the housing 10 upwards.

The pin 4a shows in Abwinkelbereich 40 two opposite directions 41. For this purpose, the pin 4c is angled.

These bends are achieved by the mounted on the pins 4, 4 a, 4 b, 4 c guide piece 7.

Above the guide piece 7, the ends of the pins 4a, b, c protrude beyond the latter and thus form a connection possibility for the coil connectors 6 which project at right angles thereto and produce an electrical connection from the pins 4 to the wire of the coil 2. The windings of the coil 2 is located on a bobbin 20th

The housing 10 used in the electromagnet 1 according to the invention is relatively complex. It consists of two Sub-housings 12, 13, wherein the sub-housing 12 receives the plug-in contact 30 with the adjoining, within the sub-housing 12 extending pins 4, 4a, 4b, 4c. The partial housing 13 essentially accommodates the bobbin 20 or the coil 2.

The sub-housings 12, 13 are, for example, cylinder-shaped and connected to one another by a transverse web 14 in the rear region. For assembly purposes, the in Fig. 1c upper area (actually the rear area of the electromagnet 1) open. This can be closed pressure-tight by a lid to be inserted (not shown).

The electromagnet 1 is characterized in that inside the coil 2 an armature space (not shown) is provided, in which an armature is arranged. If current is applied to the wire winding of the coil 2, the magnetic field generated moves the armature in the direction of the coil axis 21. A corresponding arrangement can be connected to the connection piece 22 on which the armature acts. This may be, for example, a valve block or the like.

Fig. 1c shows the (almost) ready mounted situation of the electromagnet 1 according to the invention. It still lacks the back, aufzulegende on the coil or coil connector 6 lid. Fig. 1a and 1b show earlier stages of assembly of the electromagnet according to the invention 1. The manufacturing method of the electromagnet 1, which also belongs to the invention, begins in particular in FIG Fig. 1a , The situation to be found here shows the plug contact 30, which is inserted into the left part of the housing 12, wherein the extending in the housing 10 pins 4 extend substantially parallel upward and the guide piece 7 is not yet placed on the pins 4, but is placed outside , The coil 2 is not yet inserted. The guide piece 7 is along the arrow 73 after moved down and so pressed on the pins 4. The beginning of this Aufsteckbewegung is in Fig. 1b can be clearly seen, for example, the right pin 4c in the recess 71 abuts the slope 72, whereby the slope 72 the pin 4c from the relatively central position turns outward, as in Fig. 1c is indicated. Usually, the pins or pins 4 are arranged relatively narrow and space-saving in the plug contact 30. By a corresponding widening, in particular by the bends 41 in the Abwinkelbereich 40, the possibility of connecting the pins 4, for example, to the coil connector 6 or other components considerably easier. Due to the arranged on the guide piece 7 bevels 72 experienced in the bevels 72 cooperating pins 4, 4a, 4c a corresponding bend when the guide piece 7, as of Fig. 1b is further pressed on the pins 4, as shown by the arrow 73 (this is parallel to the coil axis 21).

The guide piece 7 is plugged onto the pin until the upper ends of the guide piece dive again. This situation is in Fig. 1c or from above in Fig. 3 shown. By this arrangement, the pin 4 or the pins 4a, b, c were positioned so that in a simple manner, a welded joint 5 with the coil connector 6 (for the pins 4, 4a, 4b) can be produced. The pin 4 c is pressed by the slope 72 against the housing 10 and fixed by a welded joint 50 on the supernatant 11. Thus, the housing 10 is grounded. The projection 11 is also part of the positioning assembly 8 and is positively in a groove or recess 71 a of the guide piece 7 a. As a result, the rotational position of the guide piece 7 relative to the / the pin / s 4, 4a, 4b, 4c, 4d defined. The coil connector 6 is in particular in Fig. 3 (from above) good to see. The coil connector 6 is firmly welded to the end portions of the pins 4a, 4b, 4d, which is a simple but inexpensive and in particular represents reliable connection technology.

For the connections between the pins 4, 4a, 4b with the coil connector 6, a welded joint 5 is provided.

In Fig. 2 the guide piece 7 according to the invention is shown in detail in a three-dimensional view. The guide piece 7 has the shape of a plug and is formed, for example, as a plastic injection molded part. It has substantially centrally or centrally, the guide piece in the direction of insertion penetrating openings 70, similar holes and in the lateral region groove-like recesses 71, 71 a, which form a backdrop for guiding the pins 4 in their end or welding positions. The bevels 72 are oriented so that they include in Aufsteckrichtung 73 when the guide piece 7 is not yet placed on the pins 4, with the pin 4 form an acute angle.

The present invention is not limited by the foregoing embodiments but only by the scope of the present claims.

Claims (13)

1. Solenoid (1) consisting of a coil (2) that generates a magnetic field when electric current flows through said coil, a connection region (3) for a current source, at least one current-carrying pin (4a, 4b, 4d), a pin (4c) provided for earthing an electrically conducting casing (10) of the solenoid and a guiding piece (7), wherein the at least one current-carrying pin (4a, 4b, 4c) and the pin (4c) provided for earthing the casing are arranged at the connection region (3), and the current-carrying pin is in connection with a substantially rigid coil connector (6) through a welding joint (5), and the coil connector (6) is connected with the coil (2), and the current-carrying pin is positioned on its end facing away from the connection region (3) by the guiding piece (7) that is slid onto the current-carrying pin, wherein the connection region (3) is arranged in the casing (10) of the solenoid (1) and the guiding piece (7) is supported on the casing (10), wherein the slid-on guiding piece (7) pushes the pin (4) provided for earthing the casing onto the electrically conducting casing (10).
2. Solenoid according to claim 1, characterised in that the guiding piece (7) stabilises at least one of the pins against vibrations.
3. Solenoid according to any of the preceding claims, characterised in that the guiding piece (7) has at least one opening (70) and/or one recess (71) for receiving one of the pins, and the opening (70) or the recess (71) has a slope (72), and the pin (4) has one or more angulations (41) in an angulation region (40).
4. Solenoid according to any of the preceding claims, characterised in that a positioning arrangement (8) is provided for the guiding piece (7).
5. Solenoid according to any of the preceding claims, characterised in that the guiding piece (7) is designed as a plastic part, in particular as a plastic injection moulding part.
6. Solenoid according to any of the preceding claims, characterised in that a projection (11) is provided on the casing (10), on which projection there is a welding joint (50) with the pin (4c) provided for earthing the casing.
7. Solenoid according to any of the preceding claims, characterised in that one of the pins or the pins is/are longer than half, in particular longer than 70% of the coil length.
8. Solenoid according to any of the preceding claims, characterised in that the pins are part of a plug-in connection and/or several, initially parallel, pins (4, 4a, 4b, 4c), are arranged in the connection region (3), which pins penetrate the guiding piece (7) and have, at least partly, an angulation (41).
9. Solenoid according to any of the preceding claims, characterised in that the coil connector (6) is designed as a punched part or a stamped bent part.
10. Solenoid according to any of the preceding claims, characterised in that the coil connector (6) of the solenoid (1) has a length greater than 30%, in particular more than 50%, preferably more than 60% or more than 75% of the diameter of the coil (2).
11. Solenoid according to claim 10, characterised in that the coil connector (6) extends at least at an acute angle, preferably at a right angle, to the coil axis.
12. Method for manufacturing a solenoid according to one or more of the preceding claims, wherein the connection region is located in the casing with the pins extending in the casing, and the guiding piece is first slid onto the pins, the coil is subsequently inserted with the substantially rigid coil connector into the casing and the current-carrying pin is subsequently welded to the coil connector.
13. Method according to claim 12, characterised in that one of the pins is angled one or more times by sliding on the guiding piece.

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