WO2012171808A2

WO2012171808A2 - Contacting elements

Info

Publication number: WO2012171808A2
Application number: PCT/EP2012/060305
Authority: WO
Inventors: Rainer Kienzle; Bernd KILAST; Harald Eisenhardt
Original assignee: Robert Bosch Gmbh
Priority date: 2011-06-16
Filing date: 2012-05-31
Publication date: 2012-12-20
Also published as: EP2721695A2; EP2721695B1; CN103608972B; WO2012171808A3; CN103608972A; DE102011077589A1

Abstract

The invention relates to a contacting element (10) which in particular is formed as a contact spring. The contacting element (10) comprises spring-loaded contact spring limbs (20) which electrically contact a contact surface (32) of a contact pin (30). The contacting element (10) contacts a printed circuit board (48) which is provided with at least one printed circuit board cut-out (34). A plurality of electrically conducting contact points (26a, 26b, 28; 14, 48; 46, 48; 56, 58) are formed between the printed circuit board (48) and the contacting element (10).

Description

description

title

Contacting elements prior art

From DE 70 180 78.8 a contact spring for printed circuit boards is known. The contact spring is self-holding formed as a one-piece contact spring and comprises two spring legs and a base between the spring legs, for insertion into a breakthrough of a printed circuit board. The holder of the contact spring on the circuit board is effected by a resilient engaging behind of the spring legs of the contact spring molded cam, which is ensured by appropriate design of the cam edge pressing the circuit board between the base and cam. DE 296 17 905 U1 also relates to a printed circuit board with a contact spring. Disclosed is an electrical connector for releasably contacting a circuit board with an electronic or electromechanical device comprising a contact spring having at least one contact surface for the releasable contact engagement. At a mating contact nestle on two contact spring leg, which at a

Contact spring base are resiliently received.

G 92 05 698.9 relates to contacting a arranged within a telephone station speaker with a provided within the telephone station circuit board.

The contact spring disclosed here comprises two arms extending parallel to the printed circuit board. Along a linear contact point, the contact is shown. In one embodiment, free end portions of the arms extending parallel to the printed circuit board could be angled. DE 101 22 596 A1 relates to a contact carrier for plug contacting

Components and on a component carrier for attaching components. The contact carrier comprises a component-side carrier top side and a carrier underside and at least one conductor track or a number of through holes through which a contact element contacted with the conductor track is inserted, which projects beyond the carrier underside and serves to receive a plug contact element of the respective component. The contact element lies with at least one contacted with the conductor contact strap on the carrier top. The contact element comprises a connected to the contact tab and on the underside of the carrier

protruding clamping contact part for the respective plug-in contact element. The contact element is preferably designed as a stamped and bent part and procure one piece.

DE 34 36 1 19 A1 relates to a contact spring element for contacting

Printed circuit boards. As a result, an electrically conductive connection between a carrier part and a printed circuit board or a sheet metal part is made possible by means of a resiliently arranged on the edge of the carrier plate contact clip. The integrally formed contact clip has a latchable foot with arranged thereon contact part with several

opposite contact spring tabs for receiving therebetween

Printed circuit board or sheet metal part. The foot part comprises, in the locked state, a receiving edge provided in the carrier part and engages via a spring lug in a latching opening of the carrier part arranged at a distance from the receiving edge.

In addition to the disclosures listed above, various contacting possibilities for a printed circuit board are known from the prior art. These include Einpastepins, solder contacts, direct connectors, contact pads, conductive rubbers and the like.

DESCRIPTION OF THE INVENTION According to the invention, a contacting element is proposed, which is designed to be particularly resilient and provides a plurality of defined contact points between a printed circuit board and the contacting element, such as the contact to be contacted by the latter. The inventively proposed increase in the number of contact points on the one hand reduces contact resistance and on the other hand significantly improves the current carrying capacity of the invention proposed contacting element. Of Furthermore, it can be achieved by the solution proposed according to the invention that it has a lower sensitivity to twisting of the contact partner and therefore has a lower tolerance sensitivity compared with the known solutions.

Furthermore, by means of the solution proposed according to the invention, a more accurate positioning of the contacting element, which permits a plurality of defined contact points or support lines with the surface and end sides of a printed circuit board, can be achieved with respect to the contact partner.

In the case of the contact-making element proposed according to the invention, contact spring limbs extending essentially opposite one another extend in which at least one contact spring tongue is formed. The opposite trained

Contact spring legs of the inventively proposed contacting element have at their upper end respectively bent Kontaktfederschenkelausläufe. In this about 90 ° with respect to the contact spring leg angled

Contact spring leg outlets are arranged bends. The bends can be provided, for example, by embossing defined contact points on a linearly extending bending edge in the contact spring leg outlet.

This results in a contacting region extending on the underside of the contact spring armature outlet, so that the contacting pad arranged underneath it on the surface of the printed circuit board can be formed in a smaller space requirement. By inventively proposed solution with defined contact points, they are in point or line shape, a sharp-edged edition of the contact spring outlets can be avoided on the top of the circuit board, through which an attrition of the

Surface coating of the circuit board could be done. This impairment is definitely excluded by the solution proposed by the invention.

In a further advantageous embodiment of the invention of the underlying

Thought essentially comprise the oppositely arranged, resilient contact spring leg slits, which define contact spring tongues. The contact spring tongues are bent outwardly at the end to ensure a safe insertion of the contact pin. Through the slit can be a

Tolerance compensation against rotation of the inventively proposed

Contact spring element with respect to its locking position in one Reach PCB cutout of a circuit board and the contact pin. The individual, for example by the formation of slits in the contact spring legs

stamped contact spring tongues may have embossments, which in turn a defined contact point in point or line shape between the

According to the invention proposed contacting element and a boundary or

End surfaces of a printed circuit board to be contacted can be provided. By the proposed solution according to the invention, the electrically conductive

Contact points between the inventively proposed

Significantly increase the contacting element and the printed circuit board.

By positioning the preferred trained as a contact spring

Contacting element in a printed circuit board cutout, a secure contacting of all contact points, taking into account the inevitable occurring in manufacturing tolerances can be guaranteed. In particular, at the bottom of the

Contact spring leg outlets insertion bevels formed. These insertion bevels serve as insertion aid of the contacting element preferably designed as a contact spring during the assembly process. The chamfers allow the installation of the

Contacting element in a printed circuit board cutout with chamfers or radii. The proposed solution according to the invention makes a punching process in the circuit board for the production of printed circuit board cut unnecessary.

By appropriate design of the insertion can be realized via the position or the number of bends one-sided or multi-sided centering of the invention proposed Kontaktierungselementes against the contact pin, so that all defined contact points of the contacting, which are provided for contacting the contact pin securely on the Contact pin are positioned.

The inventively proposed contacting element, preferably as

Contact spring is formed, has punched or otherwise manufactured slits through which contact spring tongues are generated in the substantially oppositely arranged contact spring legs. These in turn allow a distribution of the current to a plurality of contact spring tongues and thus advantageously a reduction of the contact resistance and thus an increase in the

Current carrying capacity of the inventively proposed contacting element. The at least one contact spring tongue also offers a tolerance compensation against a Rotation of the inventively proposed contacting element relative to its mounting position in the printed circuit board cutout of the printed circuit board. A larger number of contact tongues, which are punched, for example, in the side walls of the contact spring legs of Kontaktierungsfederelementes allows this advantageous effect.

In a further advantageous embodiment of the invention of the underlying solution, the slits, which are substantially opposite each other

Contact spring legs extending contact spring tongues are formed in an arc shape. This allows easier handling in the event that the invention

proposed contacting elements are produced as bulk material, so that when handling this advantageous embodiment of the proposed solution according to the invention a hooking individual contacting elements can be avoided each other. Advantages of the invention

The execution of the embossing on the spring legs on the outside of

Contact element is designed so that the joining forces are minimized in the circuit board. This in turn has the advantage that the burdens in the area of the breakouts in the circuit board remain minimal and thus the Tabuzonen can be reduced, which in turn

Minimum installation space possible with a simple manual or semi-manual assembly process. Furthermore, this type of execution of the embossing reduces the abrasion of the surface coating of the printed circuit board and the contacting element in the

Joining process considerably. This, in turn, is very important for a durable low contact resistance over the lifetime seen.

By appropriate arrangement of the defined contact points, in particular defined contact points on the inside of the contact spring legs and

Contact spring tongues of the contacting element is achieved, that the joining forces of the plug contact element are reduced to a minimum. These reduced joining forces have the same advantages as those described above with regard to the installation space of a low load during joining and low surface abrasion during joining.

Brief description of the drawings With reference to the drawing, the invention will be described below in more detail. It shows:

Figure 1 is a perspective view of the invention proposed

contacting element,

Figure 2 is a side view of the invention proposed

Kontaktierungselementes, which a circuit board to several

Contacting points electrically conductive contacted and

Figure 3 is a rotated by 90 ° side view of the invention proposed

Contacting element, comparison to its representation in Figure 2.

variants

An inventively proposed, in particular designed as a contact spring contacting element 10 is subsequently in connection with the electrical

Contacting a printed circuit board for the increased demands on electrical

Contacts, e.g. described in automotive applications. By means of the contacting element 10 proposed according to the invention, for example, air conditioning blowers or other electrical consumers in the automotive sector can be contacted. The

However, application possibility of the inventively proposed contacting element 10 is possible inside and outside the automotive sector, for example in the electrical connection technology, for example in household appliances, such as washing machines, dishwashers or the like, and for example in the field of bicycle applications, such as e-bike or hybrid vehicles with electric motor and internal combustion engine drive.

FIG. 1 shows a perspective view of a contacting element designed in particular as a contact spring.

As can be seen from FIG. 1, a contacting element 10 designed in particular as a contact spring comprises two contoured contact spring limbs 20 arranged essentially opposite one another. In the two oppositely oriented contacts Contact spring legs 20, at least one contact spring tongue 12 is formed. The at least one contact spring tongue 12 has a bent end piece 14. The

Contact spring tongues 12 are formed by slits 16, which, as shown schematically in FIG. 1, can run straight or, as can be seen in FIG. 3, can run in arcuate form 42. The at least one contact spring tongue 12 in each of the contact spring legs 20 can be made for example by punching 18, wherein in each of the at least one contact spring tongue 12 and / or in the oppositely oriented Kontaktfederschenkeln 20, for example, each embossing 46 (see illustration of FIG 2) can be generated. On the embossment 46 in the at least one contact spring tongue 12 and / or the

Contact spring legs 20 will be discussed in more detail below.

As can be seen from the perspective illustration according to FIG. 1, the two contact spring limbs 20, which are contacted essentially opposite each other, are resiliently connected to one another via a bottom 54. Both contact spring leg 20 extend substantially, starting from the bottom 54 in the vertical direction and run at its upper end substantially in 90 ° angle oriented Kontaktfederschenkel spouts 22 from. In the contact spring leg outlets 22, as indicated in Figure 1, defined

Contact points 26a and 26b arranged. This ensures that the

Contact spring leg outlets 22 are formed bent upward, so that defined contact points 26 b of a bending edge 26 a to the circuit board 48 can be formed. Furthermore, it is achieved by this invention proposed embodiment that no sharp-edged edition of the contact leg outlets 22 of

According to the invention proposed contacting element 10 on a surface 50 of the printed circuit board 48 to be contacted and thus no abrasion of

Surface coating on the surface 50 of the circuit board 48 may occur. Furthermore, it can be achieved by the geometry of the contact spring leg outlets 22 proposed by the invention that the pads 28 to be contacted by these can be formed on the surface 50 of the printed circuit board 48 to be electrically contacted with regard to their space requirement in reduced size.

The perspective view of Figure 1 is further apparent that the at least one contact spring leg 20 formed in the contact spring tongue 12 is provided with a bent end 14, which is an introduction aid for a pin-shaped contact pin 30 (see illustration according to Figure 2). Figure 2 is a side view of the invention proposed

Contacting element, in particular designed to be taken as a contact spring. FIG. 2 shows that the printed circuit board 48 shown here, in particular as a contact spring, can be electrically conductively contacted at a plurality of contacting locations. FIG. 2 shows that, for example, the contact spring leg outlets 22 contact the surface 50 of the printed circuit board 48 on pads 28 and the printed circuit board cutout 34 on the upper side of the substantially oppositely oriented contact spring limbs 20. For this purpose, defined contact points 26b are arranged along the bending edge 26a, so that an electrically conductive contact with a reduced space requirement between the at the bottom of the contact spring leg outlets 22nd

arranged defined contact points 26b and the pads 28, which are located at the top 50 of the electrically conductive circuit board 48 is generated.

Furthermore, it can be seen from the side view according to FIG. 2 that the at least one contact spring tongue 12 is oriented in the opposite direction

Contact spring legs 20 is formed embossments 46 has. The embossings 46 contact the printed circuit board 48 in the region of end faces 44 of a

Printed circuit board cutout 34. Thereby are further electrically conductive contacts, i. the inventively proposed increase in the number of electrically conductive

Contacting points between the contacting element 10 and a printed circuit board 48 shown here, for example realized. By training at least one

Contact spring tongue 22 in the contact spring leg 20 is the remaining part of the

Contact spring leg 20 itself formed with the function of a contact spring tongue. The contact spring leg is then advantageously even at the appropriate places with embossing 56, 58 provided in order to achieve a defined contact. The first embossing 56 of the contact spring legs 20 contacts the contact pin 30. The second embossing 58 of the contact spring legs 20 contacts the printed circuit board 48 in the transition of the end face 44 of a printed circuit board cutout 34 and the surface 50 of the printed circuit board 48.

Depending on how many contact spring tongues 12 are formed in the oppositely oriented Kontaktfederschenkeln 20, a higher number of electrical contact points are between the in the printed circuit board cutout 34 of Printed circuit board 48 inserted contacting element 10 and the circuit board 48. By increasing the electrical contact points between, for example, the printed circuit board 48 and the contacting element 10, the reduction of the

Transition resistance and increasing the current carrying capacity of the inventively proposed contacting element 10 again improve. The more electrically conductive contacting points between the inventively proposed

Contacting element 10 and the circuit board 48 are present, the less sensitive is this contacting against rotation of one of the two contact partners, be it the printed circuit board 48, be it the contacting element 10 or the contact pin 30

According to the invention proposed solution is also achieved that a more accurate

Positioning of the contacting element 10 with respect to the circuit board 48 and the contact pin 30 can be achieved.

Figure 3 is another view of the invention proposed

Contacting element in the mounted in a printed circuit board cutout of a printed circuit board state.

Figure 3 shows that, for example, in the transition region between the curved

Contact spring leg outlets 22 of the two oppositely arranged contact spring leg 20 insertion bevels 36 are formed. The insertion bevels 36 serve as an insertion aid and for positioning in the printed circuit board cutout 34 of FIG

According to the invention proposed contacting element 10 in the assembly process, i. during insertion of the contacting element 10 into a printed circuit board cutout 34 of a printed circuit board 48 to be electrically contacted. The insertion bevel 36 and the bend allow the inventively proposed, in particular designed as a contact spring contacting element 10 in the printed circuit board cutout 34 are formed on the radii.

The possibility of the insertion bevel 36, the inventively proposed

Contacting element 10 are formed in the printed circuit board cutout 34 on the radii to obstruct, makes a punching process for the production of the printed circuit board cutout 34 superfluous. With a corresponding embodiment of the insertion bevels 36 with respect to their position, number of bends, which may be formed on one or more sides, a centering of the contacting element 10 with respect to the contact pin 30 to be contacted can be ensured. As can be seen from the illustration according to FIG. 3, in FIG

Drawing plane shown contact spring leg 20 a contact spring tongue 12, 38 executed. This is obtained by material removal in the form of an arcuate slot 40 resiliently with respect to the remaining material of the contact spring leg 20 shown in Figure 3 in the plane of the drawing. By means of the arc-shaped slots 40 exemplified here in FIG. 3, it is of course also possible to produce a plurality of resilient contact spring tongues 12 in the wall of the contact spring leg 20. The more arc-shaped slits 40 are produced in the material of the contact spring leg 20, a greater number of electrical contact points is generated. In turn, this can reduce the contact resistance between the circuit board 48 to be contacted and the one proposed according to the invention

Contacting element 10 take place, which in turn can significantly increase its current carrying capacity. By additional contact tongues and extensions of the contact spring, the cross section of the contacting element can be increased and thus its

Current carrying capacity may be increased.

In the illustration according to FIG. 3, only a spring-trained contact spring tongue 12 is shown in the wall material of the contact spring limb 20. As further shown in FIG. 3, the slot 40 extends in an arc shape. In particular, slit sheet 42 surround an embossment 46 formed in the material of the contact spring leg 20, which after formation of the arcuate slots 40 is a spring-formed contact spring tongue 12, 38. This embossment 46, be it in line form or they are - as shown in Figure 3 - formed in dot form, provides, as shown in Figure 2, an electrically conductive contact with the at least one contact spring tongue 12, 38 and an end face on an end face 44 of Printed circuit board 48 in the printed circuit board cutout 34.

In particular, can be achieved by a trained, for example in arcuate slot 40 as shown in Figure 3, which in an embodiment of the

According to the invention proposed contacting element 10 as a bulk material, the individual preferably formed as a contact springs contacting elements 10 do not interlock with each other, so that easier handling during the assembly process is made possible. The inventively proposed contacting element 10 is supplied in production usually by vibrating conveyor the assembly process, so that a

possibly occurring hooking of the contacting elements 10 enormous disadvantages would, with the occurrence of disturbances by the geometry of the inventively proposed contacting element 10 is considerably reduced.

The inventively proposed, in particular designed as a contact spring

Contacting element can - as described in the above connection with the description of Figures 1, 2 and 3 - be used as a contact spring for contacting a circuit board 48, so for example for connecting an electrically commutated

Air conditioning blowers in the automotive sector, or in any application inside and outside the automotive sector, in which an electrical connection is required.

For example, in household applications, such as in

Washing machines, dryers, dishwashers and the like or even in hybrid applications, such as e-bike or hybrid applications in vehicles with internal combustion engine and at least one electric motor to be contacted electric motor.

Claims

claims

1 . Contacting element (10), in particular designed as a contact spring, with spring-shaped contact spring legs (20) having a contact surface (32) of a

Contact pin (30) for electrically contacting a printed circuit board (48) which is provided with at least one printed circuit board cutout (34), characterized

in that a plurality of electrically conductive contacts (26a, 26b, 28; 14, 48; 46, 48; 56, 58) are formed between the printed circuit board (48), the contact pin (30) and the contacting element (10).

2. Contacting element (10) according to claim 1, characterized in that this opposing contact spring leg (20), in which in each case at least one contact spring tongue (12) is executed.

3. contacting element (10) one of the preceding claims, characterized

characterized in that the contact spring legs (20) have bent ends (24).

4. contacting element (10) according to the preceding claim, characterized

characterized in that the bent ends (24) have a bending edge or bending line (26a) with defined contact points (26b) which form a contact with pads (28) of the printed circuit board (48).

5. contacting element (10) according to one or more of the preceding

Claims, characterized in that the at least one contact spring tongue (12, 38) has a bent end (14) which facilitates the insertion of the contact pin (30).

6. Contacting element (10) according to one of the preceding claims, characterized in that the at least one contact spring tongue (12, 38) has an embossing (46) which makes an end face (44) of a printed circuit board cutout (34) electrically conductively contacted. Contacting element (10) according to one of the preceding claims, characterized in that the at least one contact spring tongue (12, 38) in

Contact spring leg (20) by slotting (16, 40) is formed.

8. Contacting element (10) according to one of the preceding claims, characterized in that by slotting and formation of the contact spring tongue (12) the slotted Kontaktfederschenkeln (20) themselves act as Kontaktfederzonen with a first embossing (56) for contacting the PCB cutout (34) and with a second embossing (58) for contacting the contact pin (30).

9. contacting element (10) according to one of the preceding claims, characterized in that the slit is formed as an arcuate slits (40, 42), wherein a slit sheet (42) embraces the embossing (46) partially.

Contacting element (10) according to one of the preceding claims, characterized in that the contact spring legs (20) comprise insertion bevels (36).

Contacting element (10) according to one of the preceding claims, characterized in that a plurality of opposing contact spring tongues (12, 38) represent a tolerance compensation against rotation between the contact partners, in particular the contacting element (10) to the circuit board (48).