DE3241551A1 - Driving linkage, in particular for windscreen-cleaning systems in motor vehicles - Google Patents

Abstract

The invention relates to a driving linkage with a ball-and-socket joint, the ball of which is guided in a socket inserted into one part of the linkage. The socket is pressed against the ball by a clamping element displaceable along the bearing axis of the joint. Readjustment of the joint in the event of wear is thus possible.

Description

Drive linkage, in particular for windscreen cleaning systems

in motor vehicles The invention relates to a drive linkage, in particular for windscreen cleaning systems in motor vehicles according to the features of the preamble of claim 1.

From DE-OS 23 35 469 a drive linkage is the aforementioned Kind of known whose joint socket is located in its below the rod part Section through several meres evenly distributed over the circumference: i # io # slots is divided into individual segments. In their lying above the rod part Section, the socket is pressed by a clamping element in the direction of the ball. As a result, a segg occurs in the section below the rod part Axial force pressing against the rod part. With dimensionally accurate production the socket is therefore under tension in the rod part. During operation the window cleaning system is the linkage part connected to the joint socket moved against a rod part connected to the ball.

Because of the friction that occurs between the parts, it occurs an abrasion of material, which is the stronger, the larger the one part are forces to be transferred to the other part. This occurs at least after a long time Time an inadmissible play between the joint socket and the one connected to it Rod part and the ball. The drive linkage thus has one in the Power transmission capacity limited by size and duration.

The unwanted game also creates the risk of dust and splash water can penetrate the joint and further reduce its performance.

The object of the invention is to provide a drive linkage of the type mentioned at the beginning Art to create which has a ball joint that is free of play at all times.

This task is carried out by a drive linkage with the characteristic Feature of claim 1 solved. The fact that a displaceable clamping element for Pressing has been selected, the joint can be readjusted if it is worn. Unwanted play can therefore be eliminated here. The displacement of the clamping element can be done, for example, by twisting, shifting and / or tilting. One-piece parts such as clamping nuts, as well as parts assembled from several pieces such as spring washers, that interact with wedges.

For the sake of clarity, those are composed of several pieces Parts not expressly mentioned in the claims. That should be noted when the term "tensioning element" appears in the claims.

When the section of the joint socket acted upon by the tensioning element is divided into segments, a particularly tight fit of the joint socket is around the ball can be achieved, so that such a joint can be subjected to particularly high loads.

The section can be particularly effectively pressed when it is equipped with an annular groove for guiding and / or fastening the clamping element which is recessed at its free end facing away from the rod part. then the section through the clamping element is against both the ball and against the rod part pressed. In this way, both an occurring during use Game as well as manufacturing tolerances are compensated.

The annular groove can either be designed so that its shape corresponds at all points to the shape of the clamping element part engaging in it. In this case, it is mainly used to guide the tensioning element. But she can also be designed so that their shape at least on one surface of the shape the cooperating surface of the clamping element part engaging in it deviates. As a result, the clamping element is clamped in the groove and thus fastened. Through a different one angular training of each other cooperating surfaces can have self-locking angles for particularly safex Attachment of the clamping element are created.

By engaging the tensioning element on the outer surface of one of the two sections of the joint socket separated by the rod part can also whose close fit to the ball can be achieved. The person to be pressed needs to be Section does not necessarily have to be divided into segments.

This can be done by attaching threads to the cooperating Surfaces of the joint socket and the clamping element with the locking of the section the ball and the rod part can be achieved. For extremely heavy-duty drive linkages is a combination of the design mentioned here with one of the previously described Variants with one groove are advantageous.

By a different design of the shape of the cooperating Thread, a particularly effective readjustment of the joint can be achieved.

If the socket has neither a groove nor a thread, it can you give the clamping element a secure hold by connecting it to the rod part connects, for example riveted or screwed to the rod part or by it is jammed with the rod part.

However, it is also possible to interconnect the clamping element and the ball connect to. Then it is particularly advantageous if the ball has a groove for clamping of the clamping element.

Further advantageous details and embodiments of the invention are shown in the drawing using exemplary embodiments. Here are all figures shown in a section along the longitudinal direction of the ball joint. the Figures 1 to 5 show in the left and in the right half each a different embodiment.

In detail, FIGS. 1 to 4 and FIG. 5 show in the right Half of each a joint socket with a groove and / or a thread for the clamping element, FIG. 5 in the left half and FIG. 6 each with one rod part connected clamping element and FIGS. 7 to 14 each one on the one rod part or clamping element clamped to the ball.

All figures show details of drive linkages for windscreen cleaning systems in motor vehicles which have a joint socket 20 for guiding a ball 10. The ball 10 consists of a metallic material, the joint socket 20 made of wear-resistant plastic. 1 to 12 are so-called in FIGS Single ball joints and so-called double ball joints in FIGS. 13 and 14.

With the former one rod part 30, with the latter two rod parts 30 can be connected to a lever 40. Both with the single ball joints as In the case of the double ball joints, too, each joint socket 20 has the ball 10 in it surrounding area an approximately circular shape. It encloses this approximately in the area of the equatorial circle 11 and is in a bore 31 of the rod part 30 used. The rod part 30 accordingly divides the joint socket 20 into two sections 22 and 23, one of which is provided with the reference number 22 section above of the equatorial circle 11 and the other, provided with the reference numeral 23 section lies below the equatorial circle 11.

First of all, the single ball joints shown in FIGS. 1 to 6 should now be considered will be discussed in more detail.

The two-part joint sockets 20 shown here are in their upper section 22 executed closed and protect the joint from above the penetration of impurities.

In their lower portion 23, the joint sockets 20 are through several meridional slots 50 divided into individual spring tongues 24. It is from the 1 to 3 and in the right half of FIG. 5 shown spring tongues 24 at its free end facing away from the rod part 30, an annular groove 25 is cut out. A tensioning element 60 engages in this annular groove 25.

In the embodiment shown in the left half of FIG the clamping element 60 consists of a clamping ring made of a spring-elastic steel, which has a disk-like flange 61, which in the unassembled state a assumes an acute angle to the other, annular region 62 of the clamping ring 60. If you move the clamping ring 60, as shown here, along the bearing axis 70 of the ball joint with the area 62 into the rectangular cross-section parallel to the bearing axis 70 running groove 25 is inserted, the area 62 presses the right of the annular groove 25 lying half of the spring tongue 24 against the ball 10 and the area 61 on the left of the groove 25 lying half of the spring tongue 24 against the rod part 30. If if the clamping ring 60 is pushed less far into the annular groove 25, the spring tongues become 24 less pressed. The position of the clamping ring shown in this figure 60 represents the most stable position, since the flange 61 with its lower end 24a facing surface on the spring tongue 24 rests.

The embodiment shown in the right half of FIG shows as the clamping element 60 a clamp made of a spring-elastic steel, the similar to the clamping ring shown in the left half of FIG. 1 with a angled Area 62 engages in annular groove 25. The clamp glasses 60 engages around the rod part 30 with a hook-shaped section 61. This is how it is Clamping element 60 securely attached to the joint.

The embodiment shown in the left half of FIG shows a cross-section of a substantially wedge-shaped clamping ring 60 made of steel, which engages in an annular groove 25 on its longitudinal side surface close to the ball bushing 10 has a conical slope 26 which opposes the curvature of the ball 10 is. The clamping wedge 60 lies with its conical outer surface on this conical slope 26 63, which in their upper 63b.

Area with the same inclination in the same direction as 63c the Conical slope 26 shows. In its lower area is the outer surface 63 of the clamping wedge 60 angled in the direction of the ball socket 10. On the opposite of the outer surface 63 On the side, the clamping wedge 60 lies in the upper area with a vertical surface 63a on the vertical longitudinal side surface of the annular groove 25. In the lower area owns the clamping wedge 60 has a further conical bevel 64 on which another clamping element, namely a spring ring 60a, which is supported at the lower end 24a of the spring tongues 24 is present. Depending on how far the spring ring 60a extends the clamping wedge 60 on its conical slope 64 pushes along the bearing axis 70 into the annular groove 25, the spring tongues 24 pressed more or less. Since the outer surface 63 of the clamping wedge 60 as previously described, angled in the direction of the ball 10 rich in its lower loading is, the clamping wedge 60 can only be pushed into the annular groove 25 to a limited extent.

This ensures that the spring tongues 24 are pressed firmly in a defined manner. As soon as the joint is under load, the tension wedge and the tension wedge try to relax 60 thereby tries to slip out of the annular groove 25, the spring ring 60a presses due to it its resilience against the conical slope 64 of the clamping wedge 60, so that this slips back into the annular groove 25. This is an automatic retensioning of the joint guaranteed.

In the embodiment shown in the right half of FIG engages in the annular groove 25 a cross-sectionally conical, annular clamping element 60 made of rubber, which has a slightly larger volume than the cross-section as well has a conical annular groove 25. As a result, the spring tongues 24 are against the ball 10 and the rod part 30 is pressed. The direction of inclination of the cone slopes 26 the annular groove 25 corresponds to the direction of the inclination of the cone slopes Outer surfaces 63 of the rubber ring 60. The vertical position of the rubber ring 60 in the Annular groove 25 can be fixed by a further clamping element 60a, namely a flanged disk, whose raised edge on the inner surface 66 extends around the entire circumference extending bead 65, which in one of the outer surface 27 of the spring tongues 24 cut-out groove 28 engages. The flanged washer 60a can consist of one relatively soft metal, for example made of aluminum. then The flanged washer 60a can be fixed in the groove 28 by being stamped onto the spring tongues 24 will. The flanged washer 60a can also consist of a hard, resilient one Metal, such as steel, can be made after sliding on the edge Be engaged in the groove 28 via the outer surface 26 of the spring tongues 24. In the first In this case, the bead 65 can be formed by embossing a bead in the outer surface of the flared disk edge are generated during the stamping of the flanged disk 60a on the spring tongues 24, in the second case, the bead 65 must be produced before the edge is flanged.

The right embodiment of FIG. 3 shows a similar principle like the right-hand exemplary embodiment in FIG. 1. Here, too, there is a ring groove 25 A conical, ring-shaped clamping element 60 made of rubber is used in cross section. the vertical position of this rubber ring 60 in the annular groove 25, however, is through a nut 60a can be determined, which with its cylindrical thread 65 in one of the outer surface 27 of the spring tongues 24 cut out cylindrical mating thread 29 engages. By tightening the nut 60a, the can be readjusted in a simple manner Joint possible.

In the embodiment shown in the left half of FIG the tensioning element 60 is part of a nut which, like the one in the right half of the Fig. 3 shown nut 60a with its thread 65 in the from the outer surface of the Spring tongues 24 cut mating thread 29 engages. That has the big one Advantage that fewer parts and the clamping element have to be joined together at the joint 60 cannot be lost under any circumstances.

Also in the embodiment shown in the right half of FIG the spring tongues 24 are secured by a clamping element 60, which is part of a nut, here is part of a flare nut, which with its round thread 65 in one of the outer surface of the spring tongues 24 cut-out round thread 29 engages.

In all the exemplary embodiments shown so far, the intervention of the tensioning element into a groove recessed from the free ends of the spring tongues secure enclosure of the ball guaranteed.

In the exemplary embodiments shown in FIG. 4, the Position of the spring tongues 24 also secured by nuts.

The nut 60 shown in the right half of FIG. 4 has a thread 65 with a conical outlet 63 which protrudes from the outer surface of the spring tongues cut out cylindrical thread 29 engages. Through the conical spout 63, a greater preload can be achieved than with the threads shown above. An even greater bias is shown in the left half of FIG Embodiment achievable. Here it has a conical shape over its entire height cut thread 65 of the nut 60 a different cone ratio than the mating thread 29 of the spring tongues 24.

In the left half of FIG. 5 and in FIG. 6 there are joint sockets 20 shown, the spring tongues 24 by tensioning elements 60 from resilient Materials against the ball 10 be pressed with the rod part 30 are connected.

The in the left half of Fig. 5 and in the right half of the Fig. 6 shown clamping disks 60 have one below the rod part 30 extending, horizontal section 61, which is penetrated by a bore 67 is. The rod part 30 is also penetrated by a bore 31, which with the bore 67 of the clamping disk 60 is aligned. In the case of the left half of Fig. The example shown in FIG. 5 is the clamping disk 60 by means of a self-tapping one Screw 80 is connected to the rod part 30. It could just as easily be through one Rivet or "self-riveting" are connected to the rod part 30. Even with the in the embodiment shown on the right-hand side of FIG. 6, a screw takes care of it 80 for a secure hold of the tensioning disk 60, which is attached to the lower ends 24a of the Spring tongues 24 'are applied, which are shorter than the spring tongues 24 and are with these extend alternately around the circumference of the joint socket 20.

The tensioning disk 60 shown in the left half of FIG. 6 is clamped to the rod part 30. For this purpose, their angled edge 61 was through the Bore 31 of the rod part 30 inserted. The edge 61 was wider before assembly angled in the direction of arrow 90, so that the winding disk 60 is now under tension seated in the bore 31. In all three of the last-mentioned cases, the clamping elements press 60 with their inclined inner surfaces located on the curved sections 62 66 the also sd ## igen outer surfaces 27 of the spring tongues 24 on.

This variant therefore requires less processing The parts used are necessary because no threads are provided.

In all of the cases shown in FIGS. 1 to 6, the interaction of the clamping element with a slotted joint socket a large enclosure of the Ball with low contact pressure and a backlash-free joint for large forces to be transferred created.

The following exemplary embodiments of FIGS. 7 to 14 show ball joints with circular joint sockets 20 made of plastic, which are inserted into the rod part 30 are injected and are not divided into spring tongues. The joints are through Sealed clamping elements 60, which are made of resilient materials, in particular Plastics.

In the example shown in Fig. 7, a ball 10 can be seen, which is pressed with its one collar 12 onto a bolt 100. The bolt 100 is screwed with a thread 101 into a bore 41 in the lever 40 and means a mother 120 secured. Both the upper section 22 and the lower section 23 of the joint socket 20 are on their side facing away from the rod part30 with a Annular groove 25 is provided into which a sealing cap 60 or 60a engages. The sealing caps 60, 60a are each locked with a bulging edge 68 in the annular groove 25. the Cap 60 is designed to be closed on one side and additionally seals the joint from above, while the cap 60a tightly encloses the bolt 100 with an opening.

In the embodiment of FIG. 8, the ball 10 is with a conical extension 12, which is provided with a thread 13, is screwed into the lever 40. The upper section 22 of the joint socket 20 is itself designed as a protective cap.

The space between the lower section 23 of the joint socket 20 and the lever 40 is sealed by an annular clamping element 60 made of plastic, with its upper end 68 on the rod part 30 and with its lower end 69 is supported on lever 40. The circular ring 60 is between the linkage 30 and the lever 40 clamped and thus ensures a secure seal.

In the embodiments of FIGS. 9 to 14, the ball joints have each has a bolt 130 on which one or two balls 10 designed as sockets are pressed on, which terminate in a collar 12 on both sides in the vertical direction.

One end 101 of the bolts 130 is inserted into a recess 41 of the lever 40 buttoned and provided at its other end 102 with a thread, on which a nut 120 is screwed, which the vertical position of the bolt 130 and thus secures the ball 10 (FIG. 9).

The exemplary embodiment shown in FIG. 9, exemplary embodiment has two plastic caps 60, 60a, which the socket 20 and the ball 10 and support themselves with their edges 68 on the rod part 30. On his the edge 69 opposite the edge 68 is each cap 60, 60a with a circumferential Bead 69a clamped in a groove 13 which emerges from the outer surface of the collar 12 of the Ball 10 is recessed.

In Fig. 10, the plastic rings 60 shown here are supported 60a with its edge 68 on the joint socket 20. Everyone is on the other edge 69 Ring, 60 with 60a like the caps shown in the example shown a bead 69a clamped in a groove 13.

Fig. 11 shows an intermediate solution between the latter two Examples. The rings 60, 60a are supported as in the example of FIG. 10 on the Joint socket 20, but cover a somewhat larger area of their surfaces 22a or 23a.

In FIG. 13, two of the rings 60, 60a shown in FIG. 11 are in each case superimposed in such a way that they open the space between the two joint sockets 20 of the double ball joint can seal.

A protective cap 60 'seals the joint from above, like the Ring 60 is clamped on the upper ball 10.

In the embodiment shown in Fig. 12, both are collars 12 dter ball 10 executed separately and in their thinner areas with external threads 14, onto each of which a locking ring 60 'is screwed. The retaining rings 60 'press the sealing rings 60 and 60a against the ball 10 and f in cross section U-shaped, made of an elastic material the socket 20th

The double ball joint shown in FIG. 14 has safety caps 60 with inserts 60a made of rubber-elastic material, which the collars 12 of the balls 10 enclose. The caps 60 lie with the inlays 60a on the surfaces 22a respectively.

23a of the socket 20.

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Claims (18)

Drive linkage, in particular for window cleaning systems in motor vehicles Claims: Drive linkage, in particular for windshield cleaning systems in Motor vehicles, which has a ball joint with at least one ball (10) which is guided in a substantially circular joint socket (20), which approximately in the area of the equatorial circle (11) in a bore (31) of a rod part (30) is used, characterized in that the joint socket (20) near the them in two sections (22,23) separating rod part (30) on one (23) of the two Sections (22,23) by a displaceable along the bearing axis (70) of the joint Clamping element (60,60a) is pressed against the ball (10). 2. Drive linkage according to claim 1, characterized in that the section (23) through several meridional slots (50) into individual segments (24) is divided. 3. Drive linkage according to claim 1 or 2, characterized in that that the section (23,24) at its free end facing away from the rod part (30) has an annular groove (25) into which (las Spallnelelnerlt (60) engages. 4. Drive linkage according to claim 3, characterized in that the annular groove (25) has at least one surface (26) which is in the shape of the with her cooperating surface (63) of the clamping element (60) differs. 5. Drive linkage according to claim 3 or 4, characterized in that that the annular groove (25) on at least one longitudinal side surface a conical slope (26) has on which the tensioning element (60) rests with an outer surface (63). 6. Drive linkage according to claim 5, characterized in that the direction of the inclination of the conical slope (26) and / or the direction of the inclination the outer surface (63) of the clamping element (60) the direction of curvature of the ball (10) corresponds in the area enclosed by the tensioning element (60). 7. Drive linkage according to claim 5, characterized in that the direction of the inclination of the conical slope (26) and / or the direction of the inclination the outer surface (63) of the tensioning element (60) the direction of curvature of the cones (10) opposite in the area enclosed by the tensioning element (60) in a section (63b) is. 8. Drive linkage according to claim 1 or one of the preceding Claims 2 to 7, characterized in that the clamping element (60) with its Inner surface (65,66) on the outer surface (27) of one (23) of the two sections (22,23) attacks. 9. Drive linkage according to claim 8, characterized in that the outer surface (27) of the section (23), which is preferably divided into segments (24) is provided with a thread (29), in which the clamping element (60) with a mating thread (65) intervenes. 10. Drive linkage according to claim 9, characterized in that at least one of the two threads (29, 65) is cut conically, at least in some areas is. 11. Drive linkage according to claim 10, characterized in that the conical areas (63) are designed with different cone ratios. 12. Drive linkage according to at least one of claims 1 to 8, characterized in that the clamping element (60) is connected to the rod part (30) is. 13. Drive linkage according to claim 12, characterized in that the clamping element (60) is riveted or screwed to the rod part (30). 14. Drive linkage according to claim 12 or 13, characterized in that that the clamping element (60) is clamped to the rod part (30). 15. Drive linkage according to claim 14, characterized in that the rod part (30) has a recess (31) into which the clamping element (60) intervenes. 16. Drive linkage according to at least one of claims 1 to 8, characterized in that the clamping element (60) is connected to the ball (10). 17. Drive linkage according to claim 16, characterized in that the ball (10) has a stepped groove (3) into which the clamping element (60) intervenes. 18. Drive linkage according to at least one of the preceding claims, characterized in that the joint socket (20) is made from a wear-resistant plastic and the tensioning element (60, 60a) consists of at least one highly elastic material and is at least partially harder than the joint socket (20).