DE102007040422B3 - Connection unit for e.g. protective grounding connection in engine connection box of electric motor, has bearing surfaces with parallel running slots, where slots on one side of frame are perpendicular to slots on another side of frame - Google Patents

Abstract

The connection unit has a bearing surface arranged at a clamping base and another bearing surface (23) arranged at a clamp frame (20). The clamp frame includes a lead through opening (24) for receiving a screw. A third bearing surface is formed in the clamp frame at a side that is opposite to the latter bearing surface, where the latter bearing surface and the third bearing surface include a system of parallel running slots. The parallel running slots on one side of the clamp frame are arranged perpendicular to the parallel running slots on another side of the clamp frame.

Description

The The invention relates to a connection unit for connecting a or more conductors.

From the DE 76 05 768 U1 a clamp for mounting an overhead line in the head channel of a support insulator by means of a Beiseiles is known in which receive the clamping jaws of the clamp on the ropes facing surface roughening or grooves and the like.

From the DE 74 14 403 U is an electrical screw terminal is known in which two pairs of co-operating clamping pieces have grooves that have a corrugation.

From the DE 18 28 166 U is a terminal for electrical equipment, in particular for fuse bases of NH fuses, known, which has a screwed into the fixed clamp body clamping screw and a clamping claw with side cams, the cams are formed in their length differently augebildet and wherein the lower part recesses of different depths for having the engagement of the cam.

From the DE 101 36 361 A1 a connection device for electrically contacting a ground line with ground potential is known, which has an upper and a lower clamping part, which have a recess for attachment to a ground terminal bolt, wherein the two clamping parts are braced against each other via a fastening element.

From the DE 23 30 371 A For example, there is known a terminal for making electrical connection with aluminum wire having a terminal plate and means urging the free end of an aluminum wire against a contact surface of the terminal plate, the terminal plate contacting surface being a plurality of closely spaced, flat, thin ones Layer of flowable metal coated corrugations is provided and wherein the flowable metal distributed over the corrugations formed by the plurality of rupture or roughening in the normally existing oxide layer at the free end of the aluminum wire and thereby prevents oxidation of the contact points.

From the US Pat. No. 7,140,887 B2 For example, an electrical wiring apparatus having a plurality of end pipe types is known in which the stripped end of an electrical conductor is received between a ribbed surface of a clamping plate and a ribbed surface of a land.

From the AT 190 567 B is a method for producing electrical connection terminals, in which the voltage applied to the conductor part cylindrical contact surfaces of the jaws are provided with elevations, preferably in the form of small pyramids, known in which initially rods are made with longitudinal grooves or longitudinal ribs by chipless metal machining and then in the rods are cut single or multi-start helical transverse grooves by means of tapping tools.

From the US Pat. No. 6,683,251 B1 a pressure plate for a switch or a terminal is known, which has at least one inner spacer pin, at least one outer spacer pin and a rotation-preventing leg, the internal and outer spacer bolts prevent over tightening a clamping screw and the rotation-preventing leg preserves the orientation of the pressure plate and Deformation of a quick-wiring arm is prevented when a fast-wired conductor is removed from the device.

From the DE 20 2004 015 702 U1 a cable terminal is known in a corner region of a conductive member having a base member and a holding member which are held with a fixing member on a base surface of the conductive member and each having a base portion and an angularly outgoing therefrom holding portion, wherein the base portion of the base member on the Socket surface and the holding portion is disposed at or a small distance from an angle to the base surface extending wall surface of the conductive member, and wherein the holding element engages over the base portion of the base member, so that at least one cable between the base portions held and secured by the holding portions.

From the DE 74 05 581 U a terminal board is known, which has threaded studs for clamping the conductor terminals and clamping nuts for the bracket, the clamping nuts are provided on their directed against the clamp end face with a mother of one part rigid disc whose diameter is greater than that mother.

From the DE 10 2006 016 271 A1 an electric motor with a terminal box for connecting the electrical wires and a separately formed terminal base for the protective conductor connection is known.

Of the The invention has the object of providing a connection unit, which allows a safe connection of conductor ends.

According to the invention the object is achieved by a connection unit according to the features specified in claim 1 or 15. Other advantages emerge from the dependent claims.

Important Features of the invention of a connection unit are that an inserted Ladder between two bearing surfaces can be clamped, wherein at least one bearing surface a System of depressions is formed, with which the holding force of the inserted conductor increases is. The advantage here is that the wells by the contact pressure of the bearing surfaces connecting fastener deform an inserted conductor and the deformations form fit to intervene in the depressions. Thus, a connection unit provided, even in the case of unevenness in the bearing surfaces or at Deformations in conductor ends, caused for example by previous use, safe connection of conductor ends allows is. Next are on both sides of the fastener ladder itself different diameters inserted through the wells be held securely, although the bearing surfaces pressed together crookedly become. In particular, thus a secure looping through the protective conductor through the ground terminal of a motor terminal box possible, wherein the clamped conductor ends through the recesses against accidental slipping out are secured.

at the invention is further the at least one bearing surface on one clamp educated. The advantage here is that a terminal block with increased holding power the cable is provided.

at The invention is further on the terminal bracket on two opposite Pages each one support surface formed, both bearing surfaces for a system of parallel have running recesses. The advantage here is that one additional terminal bracket can be placed on the terminal bracket is, being between the terminal bracket and the other terminal bracket additional conductors can be inserted, which by the inventive design the bearing surfaces with elevated Holding power to be maintained. Alternatively, one leader is or are two Conductor ends can be inserted between two terminal clamps, which are identical are constructed.

at Finally, the invention is the parallel depressions on one side of the terminal bracket perpendicular to the parallel depressions on the other side of the terminal bracket arranged. The advantage here is that the terminal bracket with guide legs equipped can be causing a 90 ° twist when stacking results. Because this twist is made by the relative rotation of the patterns of depressions on underside and imaged top, so the wells run in each Fall perpendicular to the insertion direction and thus perpendicular to the pulling direction the inserted ladder. The depressions turned into each other support surfaces thus run parallel. Unlike elevations caused by deforming of the entire material, wells leave such rotated by 90 ° Arrangement on both sides with low production costs too. to Production are only stamping dies on both sides of the clamping bracket to press in a twisted position. By stacking up several identical terminal clamps the additional result Advantage that both bearing surfaces each conductor made of the same metal or metal alloy are while For example, the terminal block on which the terminal bracket mounted be made of other material, for example, from another metal alloy or another metal that is manufacturable without being near the inserted conductor ends complicated electrochemical processes take place. For example are the terminal clips off Sheet steel, galvanized sheet steel or stainless steel, and the terminal block is connected to the housing of a Junction box in one piece finished as an aluminum casting.

at an advantageous embodiment is the system of wells designed as ribbing. Under corrugation is in this document a system of lines understood, with the distance between the lines, averaged over the lines and along the course of the lines, at most a quarter of the length of the Lines, averaged over the lines is. Thus, a sufficiently narrow trained line system is provided, by the holding force on an inserted between the bearing surfaces Head is raised. Preferably, the lines are straight, parallel and the same Distance executed. Particularly preferably the distance even less than a fifth of the length of the lines.

at an advantageous embodiment is the system of wells formed as extending transversely to the insertion direction depressions. The advantage here is that the positive connection at least one force receives, which can be introduced by pulling on the cable.

In an advantageous embodiment of the terminal bracket on two guide legs, wherein the parallel depressions extend on one side of the terminal bracket of a guide leg to the other. The advantage here is that the guide legs prevent rotation of the support surface relative to an inserted wire or conductor. This ensures that the recesses extend transversely to the insertion direction and cause an increased holding force by an additional positive connection. By the guide legs is also advantageously achieved that the terminal bracket even when tightening the fastener, preferably a screw, not mitdre hen and so the ladder does not slip. This further reduces the likelihood of unwanted detachment of the conductor ends from the terminal unit.

at According to an advantageous embodiment, the depressions are formed as indentations. Thus, a simple, inexpensive manufacturing method is provided, In particular, cold forming is applicable.

at According to an advantageous embodiment, the depressions extend over the Width of the support surface. The advantage here is that the entire width of the support surface for Inserting the ladder is usable. In particular, therefore, is a crooked Insertion of the conductor or conductors is not detrimental to the operation or retaining power. Also, several conductors are essentially parallel insertable, even with different conductor cross sections.

The support surfaces are pressed together by a screw, with the depressions be broken through a hole for receiving the screw. Preferably, a spring ring is inserted under the screw. From The advantage here is that the screw fixation of the pattern is caused by depressions to each other and that the contact pressure the screw presses an inserted conductor into the recesses and deformed.

at an advantageous embodiment, the parallel Wells equidistant to each other, with the distance between 1 mm and 3 mm, in particular between 1.5 mm and 2 mm. Thus, the holding force, so the pull-out force against the purely frictional holding force without wells at least tripled. Compared to the DIN standard value the holding force even six times depending on the conductor cross-section. at a distance of the recesses between 1 mm and 3 mm is an embossing punch usable, not too big Press force requires and therefore does not wear too fast.

at In one embodiment, a terminal base is provided on which a bearing surface is provided, wherein the support surface parallel recesses having an equal distance from each other. Thus, the connection unit according to the invention in a motor connection box of an electric motor or in a general electrical connection box integrated.

Preferably a terminal board is provided, in which the protective conductor connection as a connection unit according to the invention is trained. The advantage here is that the protective earth connection or another connection for several conductors of different diameters can be used without that the holding force of the individual conductors, even when deformed Ends, below the DIN standard drops. Thus, the safety of Motor connection box against a faulty operation, for example from a non-specialist Connection of protective conductors results increased.

The Invention will now be explained in more detail with reference to figures:

It shows

1 a connection unit according to the prior art,

2 the underside of a terminal clip according to the invention,

3 the top of the terminal bracket off 2 .

4 another terminal clip according to the invention with flags,

5a another terminal clip according to the invention,

5b another terminal clamp according to the invention with oblique corrugation and

5c another terminal clamp according to the invention with grid-like corrugation.

1 shows a connection unit 8th for electrical connection of one or more conductor ends. The connection unit 8th includes a clamp made of aluminum 1 , The terminal block 1 is designed to connect a protective conductor and therefore carries a grounding symbol 9 ,

At the terminal block 1 is a terminal block 2 with a first contact surface 4 educated. On this support surface is a terminal bracket 5 hung up. A conductor end to be connected or several conductor ends will be on the top of the terminal bracket 5 hung up. Subsequently, a second terminal bracket 6 hung up. Previously, any existing electrical insulation of the conductor ends was removed. To fasten the conductor ends is a screw 7 through openings in the Klemenbügeln 5 and 6 stuck and in a hole 3 in the terminal block 2 screwed. The screw 7 thus creates a holding force for the inserted conductor ends.

2 shows a terminal clip according to the invention 20 from underneath. The terminal bracket 20 includes a base plate 21 , on the opposite sides in each case a guide leg 22 is trained. In the base plate 21 is an insertion opening 24 introduced by a screw 7 is plugged for attachment to a terminal block 2 ,

At the bottom of the base plate 21 is a support surface 23 designed as a flat surface. In the bearing surface 23 are six parallel retaining grooves 25 imprinted, which have a distance of 1.5 mm from each other. It has been found that this distance offers a good compromise between the highest possible holding force and the simplest possible punch for producing the retaining grooves 25 , If the retaining grooves are too closely spaced, then the embossing of the retaining grooves must take place with too great a pressing force, and the pressing die wears out quickly. If the retaining grooves are too far apart, their effect is too small. The holding grooves 25 each extend from a guide leg 22 to the opposite guide leg 22 , The holding grooves 25 thus run perpendicular to the guide legs 22 and thus perpendicular to the insertion direction of the conductor ends.

3 shows the top of the terminal bracket 20 , At the base plate 21 is a support surface 30 educated. In the bearing surface 30 are six parallel retaining grooves 31 shaped, which are parallel to the guide legs 22 extend. Thus, the retaining grooves run 31 perpendicular to the retaining grooves 25 , The holding grooves 31 are straight and are partially from the insertion opening 24 interrupted.

Because the retaining grooves 31 parallel to the guide legs 22 are aligned, they are perpendicular to the retaining grooves 25 , So if two terminal bars 20 one above the other, with an angular offset of 90 ° must be observed, so that the guide legs 22 do not hinder, so are the retaining grooves 25 in the bottom of the upper terminal bracket 6 with the retaining grooves 31 in the top of the lower terminal bracket 5 brought to cover. The holding grooves 25 . 31 extend in this case perpendicular to the insertion direction of the conductor ends, which are between lower terminal bracket 5 and upper clamp bracket 6 be inserted.

The terminal bracket 20 is used instead of the terminal bracket 5 and or 6 at the connection unit 8th out 1 used.

Here is the support surface 23 a first terminal bracket 20 on the support surface 4 of the terminal block 2 instead of the terminal bracket 5 placed. Subsequently, a second, similar terminal bracket 20 rotated by 90 ° instead of the terminal bracket 6 on the first terminal bracket 20 placed. Thus show the bearing surface 30 of the first terminal bracket 20 and the bearing surface 23 of the second terminal bracket 20 , In particular, the retaining grooves introduced into this 25 respectively 31 , to each other. Between the two clamps 20 conductor ends of protective conductors are inserted. The holding grooves 25 and 31 are placed so that they come in the mounted position to cover. The screw 7 presses the upper bearing surface of the first clamp bracket 20 against the lower bearing surface of the second terminal bracket. One between the bearing surfaces 23 and 31 inserted conductor end is held by the contact force, wherein the contact pressure is increased due to the caused by the retaining grooves deformations of the conductor ends.

at a further embodiment is the distance of the retaining grooves greater than 1.5 mm, for example 2 mm or 4 mm.

In another embodiment, the clamp block is 1 with the terminal block 2 made of plastic, and it's in the bearing surface 4 introduced parallel recesses. In this case, metal plates are inserted in the terminal base or threaded sleeves are inserted to establish an electrical contact with the inserted conductor ends and other connections. Preferably, the terminal base 2 not a square, but a rectangular cross-section, wherein the one side of the rectangle is longer than the distance of the guide legs 22 of the terminal bracket 20 , The groove-like depressions in the support surface 4 run parallel to the short side of the rectangle and thus parallel to the recesses in the bottom of the attached terminal bracket 20 ,

at a further embodiment are only on one side of the terminal bracket, so in a bearing surface, wells brought in.

at a further embodiment These depressions are due to a wave-shaped design of the base plate educated.

at a further embodiment are increases instead of depressions educated. In this case, the smooth areas of the contact surfaces between the raises depressions according to the invention represents.

at a further embodiment the recesses in the top of the clamp bracket are so offset the depressions in the bottom run that when putting up two clamps mutually offset retaining grooves are placed on each other.

4 shows a further inventive terminal bracket 40 , At the base plate 21 are on opposite sides of guide legs 22 educated. At one the guide legs 22 ver binding side of the base plate 21 is a flag 41 educated. On the flag 41 On the hidden side a grounding symbol is shown.

At the bottom of the base plate 21 is a support surface 23 trained, in the wells 25 are introduced. The wells 25 run parallel, extending from a guide leg 22 to the opposite guide leg 22 and are through the insertion opening 24 interrupted. The wells 25 run parallel to the approach line of the flag 41 and thus perpendicular to the insertion direction of conductor ends.

The top of the terminal bracket 40 is smooth and has no depressions. It terminates a ground connection if there is no grounding mark in the terminal block or housing.

Alternatively, the top of the terminal bracket 40 or the top of the terminal bracket 20 radially extending from the insertion opening away recesses on the head of the screwed screw 7 fix.

at a further embodiment the recesses in the bearing surfaces are formed as corrugations, the lines of corrugation being closely spaced, in particular narrower than 5 tenths or 1 tenths of a millimeter.

The 5a to 5c show further embodiments of inventive terminal bracket.

In 5a have a first terminal bracket 51 and a second terminal bracket 52 on the sides facing each other a wavy surface formed. These surfaces are made by a screw 55 so brought to cover, that in each case a survey of a terminal bracket engages in a recess of the other terminal bracket. Thus, an inserted conductor end 53 of which the conductor coat 54 was removed, by the contact pressure of the screw 55 deformed and held.

The first terminal bracket 51 is alternatively formed as part of a terminal block. In this case, the screw 55 screwed into a threaded hole in the first terminal bracket.

at a further embodiment are raises in the bearing surface introduced by the back the bearing surface imprinted a depression is, which causes a deformation of the support surface.

5b shows another terminal bracket 59 from underneath. In the bearing surface 57 for contacting a leader 58 is provided, a pattern of recesses is introduced. The pattern is formed as a corrugation with parallel grooves which are inclined at an angle to the insertion direction of the ladder 58 . 62 run.

Through the pattern, the holding force of the terminal bracket 59 increased, so that on one side of the insertion opening 60 a leader 58 with a first line cross section and on the other side of the insertion opening a conductor 62 can be inserted with a second, larger cable cross-section and securely held. The bearing surface 57 of the terminal bracket 59 is in this case no longer parallel to the mounting screw receiving bearing surface, but arranged obliquely.

guide leg 56 fix the terminal bracket 59 against rotation about the axis of the insertion opening 60 , The ladder 58 . 62 be substantially parallel to the direction of the guide legs 56 inserted. In order to achieve an increased holding force, therefore, the depressions in the support surface 57 so that each line intersects the guide legs at an angle of between 10 ° and 90 °.

5c shows a further inventive clip with another pattern 61 in the support surface. The pattern 61 consists in this case of two systems of parallel lines intersecting at an angle of 90 °. As a result, the holding force is increased again.

1

Klemmbock

2

terminal base

3

drilling

4

bearing surface

5

clamp

6

clamp

7

screw

8th

connection unit

9

earth sign

20

clamp

21

baseplate

22

guide leg

23

bearing surface

24

Through opening

25

retaining groove

30

bearing surface

31

retaining groove

40

flag

50

connection unit

51

clamp

52

clamp

53

conductor end

54

conductor shell

55

screw

56

guide leg

57

bearing surface

58

ladder

59

clamp

60

By opening trek

61

template

62

ladder

63

conductor shell

64

conductor shell

Claims (17)

Connection unit ( 8th ), for connecting one or more conductors, with a first contact surface ( 4 ) on a clamping base ( 2 ) and a second bearing surface ( 23 . 57 ) on a terminal bracket ( 5 . 6 . 20 . 40 . 59 ), between which an inserted conductor ( 63 . 64 ) is clamped, wherein the terminal bracket ( 5 . 6 . 20 . 40 . 59 ) an insertion opening ( 24 . 60 ) for receiving a screw ( 7 ), which is in a bore ( 3 ) in the clamp socket ( 2 ) engages, wherein the second bearing surface ( 23 . 57 ) of the terminal bracket ( 20 . 40 . 59 ) is formed as a system of depressions, with which the holding force of the inserted conductor ( 63 . 64 ) is increased, wherein on the terminal bracket ( 20 ) at the second bearing surface ( 23 ) opposite side a third bearing surface ( 30 ) is formed, each bearing surface ( 23 . 30 ) of the clamping bracket ( 20 ) has a system of parallel depressions, and wherein the parallel depressions on one side of the clamp ( 20 ) perpendicular to the parallel recesses on the other side of the terminal bracket ( 20 ) are arranged. Connection unit ( 8th ) according to claim 1, characterized in that the terminal bracket ( 5 . 6 . 20 . 40 . 59 ) two parallel guide legs ( 22 . 56 ) having. Connection unit according to claim 1 or 2, characterized characterized in that the system of recesses as transverse to the insertion direction the conductor extending recesses is formed. Connection unit ( 8th ) according to any one of the preceding claims, characterized in that each recess as an impression in the form of a retaining groove ( 25 . 31 ) is trained. Connection unit ( 8th ) according to claim 1 or 2, characterized in that the system of recesses is provided as corrugation ( 61 ) is trained. Connection unit ( 8th ) according to one of the preceding claims, characterized in that the parallel recesses have an equal distance from each other. Connection unit according to claim 5, characterized in that that the distance between 1 mm and 3 mm, preferably between 1.5 mm and 2 mm. Connection unit ( 8th ) according to one of the preceding claims, characterized in that the parallel recesses of the second bearing surface ( 23 . 57 ) on the terminal bracket ( 20 . 40 . 59 ) of a guide leg ( 22 . 56 ) to the other. Connection unit according to one of the preceding claims, characterized characterized in that the recesses extend over the entire support surface. Connection unit ( 8th ) according to one of the preceding claims, characterized in that the first bearing surface ( 4 ) on the terminal block ( 2 ) also has parallel recesses with an equal distance from each other. Connection unit ( 8th ) according to one of the preceding claims, characterized in that on the terminal base ( 2 ) two terminal clips ( 5 . 6 . 20 . 40 . 59 ) are arranged. Connection unit ( 8th ) according to claim 11, characterized in that the two terminal clips ( 5 . 6 . 20 . 40 . 59 ) are formed identically. Connection unit ( 8th ) according to one of the preceding claims, characterized in that the terminal base ( 2 ) consists of metallic material, preferably aluminum. Connection unit ( 8th ) according to one of the preceding claims, characterized in that the terminal clamps ( 5 . 6 . 20 . 40 . 59 ) of a different metal alloy than the terminal block ( 2 ), preferably made of stainless steel. Connection unit ( 50 ) for connecting one or more conductors with a first bearing surface on a first clamping bracket ( 51 ) and a second bearing surface on a second terminal bracket ( 52 ), between which at least one inserted conductor end ( 53 ) of a leader ( 58 ) is clamped, wherein the second terminal bracket ( 52 ) an insertion opening for receiving a screw ( 55 ), which in a threaded hole in the first clamp ( 51 ) engages, wherein the mutually facing bearing surfaces of the two terminal strap ( 51 . 52 ) are formed as wavy trained surface with mutually parallel elevations and depressions, wherein the elevations of the second bearing surface of the second clamping bracket ( 52 ) positively in the recesses of the first bearing surface of the first clamping bracket ( 51 ) and vice versa, and wherein the at the two bearing surfaces of the two clamping bracket ( 51 . 52 ) formed elevations and depressions transversely to the insertion direction of the conductor ( 54 ). Connection unit ( 8th . 50 ) according to one of the preceding claims, characterized in that it is used on a terminal board in a motor connection box of an electric motor. Connection unit ( 8th . 50 ) according to one of the preceding claims, characterized in that it is used on a terminal board for the protective conductor connection in a motor connection box of an electric motor.