JP2528804B2 - Filter plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plastic pin connector having a room open to at least one side and a mounting position, which penetrates the bottom surface from the back wall side of the room and enters the room, By a plurality of parallel plug pins that leave the room from the open surface side and at least one plastic spring element that has a through hole at the mounting position of the plug pin and that is fitted to the plug pin and is formed on the pin connector. At least one filter element, which is held in the pin connector chamber without a gap in the axial direction of the plug pin,
Particularly, it relates to a filter plug including a ferrite core. Such a filter plug is known from German Utility Model Specification No. 9005597.

In such a filter plug, the ferrite core fitted to the plug pin eliminates electromagnetic interference in association with the feedthrough capacitor. In that case, since the ferrite core has a fairly large tolerance in terms of manufacturing technology,
It is known and common to glue the ferrite core to the pin connector of the plug with an adhesive in order to position it correctly and tightly and to secure it securely. However, such a fixing method requires a complicated manufacturing process. Moreover, in this case, the curing of the adhesive agent is accompanied by a large loss of time in mass production. Moreover, adhesive bonding is not applicable to many plastics used in plug pin connectors.

According to the Federal Republic of Germany utility model No. 8912173, a filter plug with a tubular ferrite core is known. In this configuration, the ferrite core is pressed against the bottom of the mounting space by the plastic holding member. This holding part has a plug part formed at the mounting position of the plug pin, and the ferrite core is fitted to this,
On the other hand, the clearance space is formed so as to have a truncated cone-shaped protrusion facing the stopper. The holding member is formed as an independent individual component, and the engaging portion also provided on its side portion engages with the notch of the pin connector and is fixed thereto.

In the filter plug known from German Utility Model DE 9005597 A1 a spring element is provided integrally at the bottom of the chamber of the pin connector.
The ferrite core fitted to the plug pin and mounted in the room is pressed against the room against the force of the spring element by the lid fitted to the pin connector and fixedly held there. Therefore, the ferrite core is fixed in its final position only after closing the chamber with the lid by the additional structural elements.

The invention comprises, in a filter plug of the type mentioned at the outset, a means for fixing the filter element integrated in a pin connector, which allows a simpler, at the same time but more reliable and tolerance-free installation of the filter element. That is the subject.

According to the present invention, this problem is solved by providing the following features in the filter plug described above.
A) the chamber is formed with side guides with inlet ramps for the insertion of filter elements, and b) the spring element is the side wall of the pin connector orthogonal to the bottom of the chamber. The arm is provided along the side surface of the filter element, has an elasticity in a direction orthogonal to the insertion direction of the filter element, and has both ends bent at right angles in opposite directions, and c). One right-angled end of the arm of this spring element is formed on the side wall, and the other right-angled free end of the arm is formed to have an engaging projection protruding into the insertion area of the filter element. The engaging projections are arranged and shaped to engage the filter element when it is inserted into the chamber and fit into the plug pin and to press the engaged filter element against the bottom of the chamber. It is.

In such a filter plug, the filter element is inserted into the side guide of the room, fitted into the plug pin, and locked in the room with a light pressing force. After the coupling projection of the spring element has engaged the filter element, the filter element is already positioned without any other measures or additional measures,
It is securely fixed in that position. The inlet inclined surface forms an introduction passage that gradually narrows in the insertion direction of the filter element, so that the filter element can be easily assembled, and
On the side of the filter element, the filter element is arranged such that it is already in the correct position before the spring element is acted on. The filter plug according to the present invention comprises the filter element fixing means integrated in the pin connector. Therefore, the pin connector and the filter element constitute a unit that can be prefabricated from only two component parts, which can be mounted completely on a substrate, for example a printed board. Placing the spring element along the side of the filter element between the filter element and the back wall of the pin connector ensures that the spring element has a spring-like arm in a direction orthogonal to the insertion direction of the filter element. The advantage of this is that a sufficient spring length can be obtained despite the limited mounting space. A further advantage of this configuration is that the spring element has no force component in the load direction and has some elasticity. This is significant for absorbing shock loads.

In filter plugs, the filter element is often formed as an integral bar-shaped ferrite core extending in the longitudinal direction. In this case, it is effective in view of the limited mounting space that the spring element is formed so as to extend in the longitudinal direction of the filter element between the filter element and the back wall of the pin connector.

The satisfactory guiding of the filter element is obtained by providing side guides on the two opposite ends of the filter element. In this case, 2 side guides each
A particularly simple configuration example can be obtained by forming one clip and arranging the clips so as to be separated according to the width of the filter element.

Particularly in the case of a filter element extending in the longitudinal direction, the back wall of the pin connector is formed so that the two spring elements are mirror-shaped with respect to each other about the midpoint of the length of the filter element, and the filter element is symmetrically formed. Engagement is effective in securing the filter element sufficiently securely.

Due to the spring action of the spring element and due to the limited space, the spring element has a substantially rectangular cross section,
It is advantageous to place it with its narrow side down and against the bottom of the room. In that case, the engaging projections of the spring element may also be placed upright with its narrow side facing down and arranged between the two plug pins. This results in a particularly space-saving construction of the filter element fixing means, despite the optimum action of the spring element.

In the filter plug according to the present invention, the mounting direction is selected to have the smallest allowable error of the filter element, so that the spring length required for reliable engagement can be small.

In order to minimize the assembling force, that is, the force when inserting the filter element into the room, a protrusion is formed so that the end face of the engaging protrusion has a slope, and the slope between the slope and the insertion direction is formed. It is effective to choose the angle of as small as possible.

The distance between the side wall of the pin connector and the arm of the spring element may be determined by taking into account the required displacement and deflection of the arm. This ensures, on the one hand, the displacement required for engagement and, on the other hand, prevents the spring from overextending.

The present invention will be described below in detail with reference to the embodiments shown in the drawings.

1 is a plan view of a portion including a filter element of a filter plug according to the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.

The filter plug has a plastic pin connector 1, which has a printed board 2 (FIG. 2) on the outside on the right and a chamber 3 which opens to the right. This chamber is defined by the front and rear side walls 4 to 5 and another side wall 6 of the pin connector 1 and another side wall projecting from a height approximately at the center of this side wall 6 to form a bottom 7 of the room 3. Is made. Furthermore, the filter plug comprises a plurality of parallel plug pins 8 arranged in the mounting position, which penetrate the side wall 6 and run parallel to the bottom 7 of the room, bending in a substantially right angle Enters the room 3 from the back side through the bottom, and exits the room 3 from the side open toward the printed board 2. The filter plug is further equipped with a filter element 9. This filter element is formed as a long bar-shaped integral ferrite core, and has a through hole 10 corresponding to the mounting position of the plug pin 8. The plug pin 8 is fitted in the through hole. The chamber 3 has side guides 15 to 16 with ramps 11, 12 to 13, 14 for positioning when inserting the ferrite core 9 into the chamber 3 and also for fixing it in its inserted position. Is formed.
This guide is arranged at two opposite ends of the ferrite core 9 and is formed by two clips 15a, 15b and 16a, 16b, respectively, which wrap around the corners of the ferrite core 9. These clips are on the side wall 4 of the pin connector 1.
2 and 5 are arranged opposite to each other, and two clips 15a, 15b and 16a, 16b, respectively, are arranged at a distance of about the width B of the ferrite core 9 and separated from each other.
The inclined surfaces 11, 12 to 13 and 14 of the side guides 15 and 16 respectively form tapered insertion passages in the inserting direction 17 of the ferrite core 9. In order to secure the ferrite core 9 in the chamber 3, two spring elements 18 are provided here. This spring element extends on the side of the ferrite core 9 between the ferrite core and the side wall 6 in the longitudinal direction of the ferrite core and is integral with the side wall 6 perpendicular to the bottom 7 of the chamber, for example injection molded. Is formed by. The spring element 18 is formed mainly by an arm 19 extending in the direction of the side wall 6 and in the longitudinal direction thereof, which arm is bent at its opposite ends in a substantially right angle in the opposite direction. Since the one bent end 20 is formed in the side wall 6 approximately at the center of the length of the ferrite core 9, the arm 19 has a spring property in a direction orthogonal to the inserting direction 17 of the ferrite gore 9. Also, the other bent free end of arm 19
21 is formed so as to have a projecting portion 22 projecting in the introduction range of the ferrite core 9, and this projecting portion engages with the ferrite core 9 when the ferrite core 9 is inserted into the room and fitted into the plug pin 8. , And is arranged and shaped to press the engaged ferato core 9 against the bottom 7 of the chamber. As can be seen in FIG. 1, both spring elements 18 are mirror-symmetrically shaped on the side wall 6 with respect to the midpoint of the length of the ferrite core and symmetrically engage the ferrite core. The spring element 18 has a substantially rectangular cross section and is arranged upright with its narrow side facing down with respect to the bottom surface 7 of the chamber, with the projection 22 of the spring element 18 between the two plug pins 8. Is engaged with the ferrite core at. The insertion direction 17 of the ferrite core 9 is the direction of the ferrite core 9 having the minimum tolerance, that is, the ferrite core 9
Is selected in the direction of height H. The protrusion 22 of the spring element 18
Is formed with a slope 23 at its end face, and the angle α1 between this slope and the insertion direction 17 is selected to be as small as possible. The engaging portion of the protrusion 22 is also formed with a slope 24, and the free angle α2 between this slope and the engaging surface of the engaging protrusion of the ferrite core 9 is such that the ferrite core 9 is disengaged. Have been chosen to automatically prevent The ferrite core 9 has a step 25 extending in the insertion direction 17 over the entire length of the ferrite core 9 with a width B so that the projection 22 can be engaged with the ferrite core 9 in general.
It is also sufficient to form the ferrite core 9 at the place where the protrusion 22 of the spring element 18 is engaged so as to have a pocket-shaped notch for this protrusion. Pin connector 1
And the distance A between it and the arm 19 of the spring element 18 parallel to it is determined according to the required displacement and deflection of the arm 19. The end portion 20 of the arm 19 formed on the side wall portion 6 of the pin connector 1 is formed to have the bent portions 26, 27 and 28 at the connection portion with the side wall portion 6 and the connection portion to the arm 19.

In the embodiment shown, the filter element 9 is formed in an elongated shape and is secured by a spring element 18 on its side which extends along the filter element 9. In the case of other differently shaped filter elements, eg relatively small and / or other shaped filter elements, in some cases only one spring element may be sufficient to secure the filter element in the insertion direction. it can.

Claims (17)

(57) [Claims] 1. A plastic pin connector having a room open to at least one surface side, which is arranged at a mounting position, penetrates a bottom surface from a rear wall side of the room to enter this room, and from the open surface side. A plurality of parallel plug pins that leave the room and a through hole at the mounting position of the plug pin, and a gap in the axial direction of the plug pin by at least one plastic spring element fitted to the plug pin and formed on the pin connector. At least one filter element, which is retained in the room of the pin connector,
In particular in a filter plug with a ferrite core: a) The chamber (3) is formed with side guides (15, 16) with inlet ramps (11 to 14) for inserting filter elements. B) The spring element (18) is provided on the side wall portion (6) of the pin connector (1) orthogonal to the bottom (7) of the room along the side surface of the filter element (9), and (9) is provided with an arm (19) which has a spring property in a direction orthogonal to the insertion direction and is bent at opposite ends thereof at right angles to each other, c) of this spring element (18) One right-angled end (20) of the arm (19) is formed on the side wall (6), and the other right-angled free end (21) of the arm (19) is connected to the filter element (9). Engagement protrusion (22) protruding into the insertion range
And the engaging protrusion engages with the filter element (9) when it is inserted into the chamber (3) and fitted into the plug pin (8), and the engaged filter element ( A filter plug, characterized in that it is arranged and shaped such that 9) is pressed against the bottom (7) of the room. 2. The filter plug according to claim 1, wherein the filter element (9) is formed as a bar-shaped integral ferrite core extending in the longitudinal direction. 3. A spring element (18) extending in the longitudinal direction of the spring element between the filter element (9) and the side wall (6) of the pin connector (1). The described filter plug. 4. Side guides (15, 16) for the filter element (9) are arranged at two opposite ends of the filter element (9). 1. The filter plug according to one of 1. 5. The side guides (15, 16) are each formed by two clips (15a, 15b to 16a, 16b) which are spaced apart from each other approximately according to the width (B) of the filter element (9). The filter plug according to claim 4, characterized in that the filter plug is disposed in a closed state. 6. The side wall (6) of the pin connector (1) runs perpendicular to the room bottom (7) and the spring element (1).
Filter plug according to one of claims 1 to 5, characterized in that the arm (19) of 8) extends in the longitudinal direction parallel to the side wall (6). 7. A spring element (18) is formed in the side wall (6) approximately at the center of the length of the filter element (9) and engages it at one end of the filter element. The filter plug according to claim 1, wherein 8. Two spring elements (18) are provided which are mirror-shaped on the side wall (6) with respect to the center of the length of the filter element (9) and which symmetrically engage the filter element. A filter plug according to any one of claims 1 to 7, characterized in that 9. The spring element (18) is formed in a substantially rectangular shape in its cross section and is arranged upright with its narrow side facing down against the bottom (7) of the room. A filter plug according to one of the ranges 1 to 8. 10. Engaging projections (22) of a spring element (18) stand up with their narrow side down and two plug pins (8).
Filter plug according to one of claims 1 to 9, characterized in that it is arranged between the two. 11. A filter plug according to claim 1, characterized in that the insertion direction (17) is chosen in the direction of the filter element (9) having the smallest tolerance. 12. The engaging projection (22) has an inclined surface (23) on its end surface, and the angle (α1) between the inclined surface (23) and the insertion direction (17) is selected to be as small as possible. The fill plug according to any one of claims 1 to 11, which is characterized in that 13. An engaging edge portion of an engaging protrusion (22) is formed with an inclined surface (24), and the inclined surface (24) and the engaging protrusion (22) are connected to a filter element (9). 13. A free angle (.alpha.2) with respect to the engagement surface of said is selected to automatically prevent disengagement of the filter element from one of claims 1 to 12. Filter plug. 14. The distance (A) between the side wall (6) of the pin connector (1) 1 and the arm (19) of the spring element (18) is determined according to the displacement and deflection of the arm (19). Filter plug according to one of claims 1 to 13, characterized in that 15. The end portion (20) of the arm (19) formed on the side wall portion (6) of the pin connector (1) extends over the connecting portion to the side wall portion (6) and the connecting portion to the arm (19). Filter plug according to one of claims 1 to 14, characterized in that it is formed with curved parts (26, 27, 28). 16. A filter element (19) comprising a step (25) extending in the insertion direction (17) over the entire length of the filter element (9) with a width (B).
The filter plug according to any one of 1 to 15. 17. A filter element (9) is formed with a notch on the pocket which engages with the protrusion 22 of the spring element 18 at the place where the protrusion 22 engages. Filter plug according to one of claims 1 to 15.