DE102011053795B4 - Cable pull of a window lifter, power transmission device, windows and motor vehicle - Google Patents

Abstract

Cable pull (2) of a window lifter, which consists of a plurality of strands (5, 7) and is designed as Rundlitzenseil, characterized in that at least one wire (4) of a stranded wire (5) has a flattening (6), wherein the flattening (6 ) is directed outwards with respect to the cable (2) and / or forms part of an outside of the cable (2).

Description

The present invention relates to a cable of a window lift, which has wires consisting of several wires. The invention further relates to a power transmission device for a window and a window and / or a motor vehicle with such a cable or with such a power transmission device.

Cables of the type mentioned are known from the prior art and are usually used for lifting loads or for the transmission of forces. In particular, such cables are used in window regulators, in particular in motor vehicle window lifts, for actuating the window pane. Often these are steel cables or cables in which at least several wires or strands are made of steel. For power transmission, these cables are sometimes performed over pulleys and / or deflector in many applications. However, it is not rare that mechanical abrasion and other signs of wear on these deflecting parts, which adversely affect the durability and thus the service life of the entire device, are caused by friction.

From the DE 296 06 235 U1 For example, there is known a brake cable for a bicycle having an outer layer and an inner strand, wherein the outer layer is formed from a plurality of wires and helically winds around the inner strand, which in turn is formed from a plurality of further wires. The wires of the outer layer form an outer surface of the brake cable, and each of the wires has been processed in a smoothing process such that the outer surface of the brake cable has flattened portions. A cross-section from any plane perpendicular to the longitudinal axis of the brake cable has an outer surface which is formed by the flattened portions of each of the wires of the outer layer and which has the shape of a non-contiguous circle.

From the US 5,802,929 A a cable winch is known, wherein the traction cable consists of a wire strand, which in turn is helically wrapped by a plurality of parallel in the longitudinal direction of the cable wire rope strands. The traction cable is guided in a guide body made of plastic, wherein a silicone lubricant is used to reduce the frictional resistance at low temperatures.

From the EP 0 834 662 A2 For example, there is known a pull-push cable having a core rope and helically wound strands around the core rope, the outer wires of the strands having a flat which faces outwardly with respect to the cable.

In addition, from the prior art often referred to as control cables or Bowden cables power transmission devices are known in which a cable of the type mentioned as inner cable in an outer train, such as a pipe made of a flexible plastic material, is performed.

However, in addition to the disadvantages mentioned above, these actuation cables often involve further technical problems resulting from the combination of a steel cable pull as inner cable and a plastic pipe as outer cable train. Thus, the friction of the steel strand in the guide tube limits on the one hand the length and the geometry of the transmission path of the power transmission device, so that with increasing length or with a curved course of the control cable, the power transmission is made only more difficult. On the other hand, it comes with the movement of the inner cable in the joint tube to an undesirable and disturbing noise.

From the publication DE 85 17 347 U1 an actuating cable is known, which consists of a steel wire, which is hammered down from a larger diameter to a smaller diameter and provided in this way with a completely smooth surface. This deformation reduces the friction between the steel strand and the plastic lining pipe in which the steel strand is guided. On the one hand, this leads to a better efficiency of the control cable and, on the other hand, allows the train to be laid, for example, in one sheet or several sheets.

Although the hammering down of the diameter of the steel strand of a previously described cable is also suitable for reducing the mechanical abrasion on deflecting parts and the noise formation in control cables. However, in order to obtain a completely smooth surface of the steel strand, its diameter must be reduced so much that it reduces the strength of the train. However, this also requires a lower durability of the cable and thus adversely affects its life.

The present invention is therefore based on the object to improve a cable, a window regulator of the type mentioned in that the mechanical abrasion on deflectors and the noise when using a cable as inner cable of a control cable are significantly reduced, but at the same time the strength and Flexibility of the cable is maintained. Another object of the invention is to provide a power transmission device and a window lifter and / or a motor vehicle with such a cable.

This object is achieved by a cable according to claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention, it has been recognized that the surface roughness of the individual wires or strands of the cable pull has a strong influence on the friction between the cable pull and deflecting parts or between the cable pull and the guide tube, and in this way in the cables known from the prior art, leads to undesirable abrasion. and noises. Occasionally, the rough surface profile of the cable is transferred to the deflecting parts and / or the inner wall of the guide tube. If both surface profiles slip on top of each other when the train is actuated, disturbing noises can occur, often associated with mechanical material abrasion.

A cable according to the present invention is particularly suitable for a window for installation in a motor vehicle. The cable has wires consisting of several wires.

According to the invention, at least one wire of the strand has a flattening, the flattening being directed outward with respect to the cable and / or forming part of an outside of the cable.

By having such a flattening the surface roughness or surface tips of the wire in the aforementioned areas - ie in the areas in which the wire is in contact with deflecting or guide tubes or contact - are reduced such that the friction between the Wire and the deflection parts or joining tubes and the associated abrasion and noise phenomena are significantly reduced.

According to a first embodiment of the invention, it is provided that all the wires of the strand each where they form part of an outer side of the cable, each having a flattening. This ensures that overall the friction and noise, due to all, a strand forming wires are reduced.

In the invention, it is also advantageous if at least one of the wires - except for the flattening - is round in cross-section. Preferably, all wires - apart from the respective flattening - may be round in cross-section. Due to the round cross-section of the wire or the wires a power transmission by means of the cable is particularly high efficiency possible.

According to the invention, the cable consists of several strands. It may be alternatively provided again that at least one wire each strand where it forms part of an outside of the cable has a flattening and / or that all the wires of all strands where they form part of an outside of the cable, are flattened and / or that at least one of the wires of each strand - apart from the flattening - is round in cross-section or that all the wires of each strand - apart from the respective flattening - are round in cross-section. Such a structure of the cable, consisting of several strands, is particularly advantageous by an increased tensile strength. It should be noted that with an increasing number of wires and strands, the friction properties of such a cable does not necessarily increase, at least not increase to the same extent as its tensile strength, since the tensile strength substantially of the cross-sectional area of the cable, the friction properties in the Essentially determined by its scope.

A further advantageous embodiment of the cable is characterized in that the cable has a core wire and / or a core strand, which are each free of flattening. Preferably, instead of the core wire or the core strand, an insert, for example made of solid, polymeric plastic, natural fibers or synthetic fibers, may be provided. Core wire, core strand and insert each form a center, around which the remaining wire layers or strand layers are arranged.

The flattening or the flattening can be produced preferably and particularly simply by deformation, in particular by hammering.

According to a further embodiment of the cable according to the invention it is provided that the outer diameter of the cable is reduced by deformation, in particular for the production of the flattening or flattening.

It is particularly advantageous if the reduction of the diameter takes place only to a small extent, so that sufficient strength of the cable is still maintained after deformation. For this reason, the ratio of the outer diameter of the inner cable before and after deformation in advantageous embodiments of the invention in the range of 1.001 to 1.15, in particular in the range of 1.01 to 1.15 or in the range of 1.03 to 1.06 or in the range of 1.02 to 1.04. This ratio is particularly advantageously 1.03.

According to the invention it is provided that the cable is designed as Rundlitzenseil. Round cord ropes have the advantage that they are distinguished from other types by a particularly high degree of flexibility. The use of round strand cables therefore makes it particularly advantageous to lay the cable in sheets, as is often required in window regulators in the field of motor vehicle doors. Furthermore, it is advantageous if the cable has a diameter in the range of 1.5 mm to 1.8 mm, preferably in particular of 1.78 mm and / or moreover consists of steel or steel, but at least at least one wire Steel is made, but preferably all wires are made of steel. The use of steel cables, sometimes in combination with the specified diameter ranges, brings both a cost and a weight advantage, on the other hand but also a sufficient tensile strength of the cable is guaranteed.

A particularly advantageous application of the cable according to the invention is a power transmission device, in particular a window, provided, which has a trained as an inner cable according to the invention cable, which is guided in a hollow, preferably flexible, tube.

Particularly preferred is a power transmission device of a window regulator is provided with an inner cable designed as a cable according to the invention, which is guided in a tube and having at least a plurality of wires strands, wherein at least one wire of a strand where it is in contact with the tube or in Contact, has a flattening.

Here, on the one hand, the phrase "in contact" refers to those embodiments of the power transmission device in which the inner cable is in constant contact with the pipe only when the inner diameter of the pipe is approximately equal to the outer diameter of the inner cable Page refers to the phrase "can be in contact" on the embodiments in which the outer diameter of the inner cable is significantly smaller than the inner cross section of the tube so that depending on the curvature of the power transmission device only individual parts of the inner cable on the inside of the tube or during the movement of the inner cable temporarily in contact with the inside of the tube.

According to one embodiment of the power transmission device according to the invention, it is provided that all the wires of the strands are each flattened where they are in contact with the tube or can be in contact. Thus, the friction and noise, due to all, a strand forming wires are reduced overall.

In such a power transmission device, it is also advantageous if at least one of the wires - apart from the flattening - is round in cross-section. Preferably, all wires - apart from the respective flattening - may be round in cross-section. Due to the round cross section of the wire or the wires a power transmission by means of the inner cable with a particularly high efficiency is possible.

According to the invention, the inner cable consists of several strands. Again, it may alternatively be provided that at least one wire of each strand has a flat where it is in contact or in contact with the tube and / or that all the wires of all the strands are in contact with the tube or are in contact, are flattened and / or that at least one of the wires of each strand - apart from the flattening - is round in cross-section or that all the wires of each strand - apart from the respective flattening - are round in cross-section. Such a structure of the inner cable, consisting of several strands, is particularly advantageous by an increased tensile strength.

Furthermore, it is advantageous if the inner cable of the power transmission device has a core wire and / or a core strand, which are each free from flattening. Preferably, instead of the core wire or the core strand, an insert, for example made of solid, polymeric plastic, natural fibers or synthetic fibers, may be provided. Core wire, core strand and insert each form a center, around which the remaining wire layers or strand layers are arranged.

Moreover, there is a further preferred embodiment of the power transmission device when the tube in which the inner cable is guided, at least partially made of plastic or if an inwardly directed part of the tube is made of plastic, since plastic parts are particularly inexpensive and easy to manufacture are.

Other objects, advantages, features and applications of the present invention will become apparent from the following description of an embodiment with reference to the drawings.

Show it:

1 a longitudinal section through part of a possible embodiment of the power transmission device according to the invention,

2 a cross section through the embodiment of the power transmission device according to the invention according to 1 and

3 a detailed view of the cross section according to 2 ,

1 shows - in a schematic representation - a part of a power transmission device ( 1 ), as used for example in a motor vehicle door in a cable window lifter for operating the door glass.

The power transmission device ( 1 ) has an inner cable ( 2a ) trained cable ( 2 ) in a hollow, flexible tube ( 3 ) is guided. The cable ( 2 ) or the inner cable ( 2a ) is designed as a circular strand rope with a diameter of 1.78 mm, which is composed of several strands, which in turn each consist of several steel wires. The outer tube tubular tube ( 3 ) is preferably made of a flexible, polymeric plastic.

In another embodiment of the invention, not shown here, only a part of the tube ( 3 ), in particular the inwardly directed part of the tube ( 3 ), be made of plastic.

The outer diameter of the inner cable ( 2a ) trained cable ( 2 ) is smaller than the inner cross-section of the tube ( 3 ), so that the inner cable ( 2a ) also transversely to the pulling direction (B) of the power transmission device ( 1 ) can move. So it can happen, as shown here, that depending on the curvature of the power transmission device ( 1 ) individual areas of the inner cable ( 2a ) on the inside of the tube ( 3 ), more precisely that individual wires of the inner cable ( 2a ) with the tube ( 3 ) stay in contact.

2 shows in cross-section the structure of the tube ( 3 ) as inner cable ( 2a ) guided cable ( 2 ) of the power transmission device ( 1 ). As a cable pull ( 2 ) is here a Rundlitzenseil used that according to the braiding formula 6 × (6 + 1) + (6 + 1) is constructed. There are 6 identical wires ( 4 ) around a core wire ( 8th ) and together form a total strand ( 5 ). The core wire ( 8th ) and the wires ( 4 ) have a round cross-section, wherein the diameter of the core wire ( 8th ) is greater than the diameter of the wires ( 4 ). In each case 6 such strands ( 5 ) are a core strand ( 7 ) stranded around. The core strand ( 7 ) exists in the same way as the strands ( 5 ) from 6 wires ( 7a ) and a core wire ( 7b ). The core wire ( 7b ) and the wires ( 7a ) also have a round cross-section, but in each case is larger than the cross-section of the core wire ( 8th ) or the wires ( 4 ). The core wires ( 8th . 7b ) and the wires ( 4 . 7a ) are each made of galvanized steel.

But there are also other ways of constructing the cable ( 2 ) with other braiding formulas conceivable, which are in particular suitable, an inner cable ( 2a ) for a power transmission device according to the invention ( 1 ). Thus, in another embodiment, not shown here, of the cable pull according to the invention ( 2 ) instead of the core strands ( 7 ) also an insert, for example, from solid, polymeric plastic, natural fibers or synthetic fibers, may be provided.

How out 2 it can also be seen that the wires ( 4 ) of strands ( 5 ) where they are with the tube ( 3 ) are in contact or in contact, a flattening ( 6 ) on. The the core strand ( 7 ) forming wires ( 7a ) and the core wire ( 7b ) and the core wires ( 8th ) are free from flattening. It can also be seen from FIG. 2 that the flattenings ( 6 ) with respect to the cable ( 2 ) are directed outwards and part of an outside of the cable ( 2 ) form.

The flattenings ( 6 ) are preferably by hammering the inner cable ( 2a ) generated. In this case, the outer diameter of the inner cable ( 2a ) reduced only to such a small extent that the ratio of the outer diameter of the inner cable ( 2a ) before and after hammering in the range of 1.001 to 1.05, in particular in the range of 1.01 to 1.05. In the in 2 shown embodiment, this ratio is 1.03.

3 shows the in 2 circled detail area (A). This detail view makes it clear that the flattenings produced by hammering ( 6 ) only minimally the originally round cross-section of the wires ( 4 ) deform with the effect that only the surface roughness or surface peaks of the individual wires ( 4 ) are reduced. This leaves the strength of the cable ( 2 ) received unabated, but at the same time the friction and the associated noise when sliding as inner cable ( 2a ) trained cable ( 2 ) on the inner wall of the tubular tube ( 3 ) significantly reduced.

Claims (17)

Cable ( 2 ) of a window regulator consisting of several strands ( 5 . 7 ) and is designed as Rundlitzenseil, characterized in that at least one wire ( 4 ) of a stranded wire ( 5 ) a flattening ( 6 ), wherein the flattening ( 6 ) with respect to the cable ( 2 ) is directed outwards and / or part of an outer side of the cable ( 2 ). Cable ( 2 ) according to claim 1, characterized in that all the wires ( 4 ) of strands ( 5 ) where they form part of an outside of the cable ( 2 ), one flattening each ( 6 ) exhibit. Cable ( 2 ) according to claim 1 or 2, characterized in that at least one of the wires ( 4 . 7a ) - apart from the flattening ( 6 ) - is round in cross-section or that all wires ( 4 . 7a ) - apart from the respective flattening ( 6 ) - are formed round in cross-section. Cable ( 2 ) according to one of claims 1 to 3, characterized in that a. at least one wire ( 4 ) each strand ( 5 ) where it forms part of an outside of the cable ( 2 ), a flattening ( 6 ) and / or that b. all wires ( 4 ) of all strands ( 5 ) where they form part of an outside of the cable ( 2 ), are flattened and / or that c. at least one of the wires ( 4 . 7a ) each strand ( 5 . 7 ) - apart from the flattening ( 6 ) - is round in cross-section or where all the wires ( 4 . 7a ) each strand ( 5 . 7 ) - apart from the respective flattening ( 6 ) - are formed round in cross-section. Cable ( 2 ) according to one of claims 1 to 4, characterized in that the cable ( 2 ) a core wire ( 7b . 8th ), which is free of flats, and / or that the cable ( 2 ) a core strand ( 7 ), which is free from flattening and / or that the cable ( 2 ) has an insert which is free from flattening. Cable ( 2 ) according to one of claims 1 to 5, characterized in that the flattening ( 6 ) or the flattenings ( 6 ) are produced by deformation. Cable ( 2 ) according to one of claims 1 to 6, characterized in that the outer diameter of the cable ( 2 ) is reduced by deformation. Cable ( 2 ) according to claim 7, characterized in that the ratio of the outer diameter of the cable ( 2 ) before and after deformation in the range of 1.001 to 1.15, in particular in the range of 1.01 to 1.15 or in the range of 1.03 to 1.06 or in the range of 1.02 to 1.04, especially 1.03. Cable ( 2 ) according to one of claims 1 to 8, characterized in that a. the cable ( 2 ) has a diameter in the range of 1.5 mm to 1.8 mm, in particular of 1.78 mm, and / or that b. the cable ( 2 ) consists of steel or steel and / or that c. at least one wire ( 4 . 7a . 7b . 8th ) is made of steel, preferably all wires ( 4 . 7a . 7b . 8th ), are made of steel. Power transmission device ( 1 ) of a window lifter, with an inner cable ( 2a ) trained cable ( 2 ) according to one of claims 1 to 9, in a hollow, preferably flexible, tube ( 3 ) is guided. Power transmission device ( 1 ) according to claim 10, characterized in that all the wires ( 4 ) of strands ( 5 ) where they are with the tube ( 3 ) are in contact or flattened. Power transmission device ( 1 ) according to one of claims 10 or 11, characterized in that at least one of the wires ( 4 . 7a ) - apart from the flattening ( 6 ) - is round in cross-section or that all wires ( 4 . 7a ) - apart from the respective flattening ( 6 ) - are formed round in cross-section. Power transmission device ( 1 ) according to one of claims 10 to 12, characterized in that a. the inner cable ( 2a ) of several strands ( 5 . 7 ), wherein at least one wire ( 4 ) each strand ( 5 ) where he is with the tube ( 3 ) is in contact or in contact, a flattening ( 6 ) and / or that b. the inner cable ( 2a ) of several strands ( 5 . 7 ), all wires ( 4 ) of all strands ( 5 ) where they are with the tube ( 3 ) are in contact or in contact, are flattened and / or that c. the inner cable of several strands ( 5 . 7 ), wherein at least one of the wires ( 4 . 7a ) each strand ( 5 . 7 ) - apart from the flattening ( 6 ) - is round in cross-section or where all the wires ( 4 . 7a ) each strand ( 5 . 7 ) - apart from the respective flattening ( 6 ) - are formed round in cross-section. Power transmission device ( 1 ) according to one of claims 10 to 13, characterized in that the inner cable ( 2a ) a core wire ( 7b . 8th ), which is free of flats, and / or that the inner cable ( 2a ) a core strand ( 7 ), which is free from flattening and / or that the inner cable ( 2a ) has an insert which is free from flattening. Power transmission device ( 1 ) according to one of claims 10 to 14, characterized in that the tube ( 3 ) is at least partially made of plastic and / or that an inwardly directed part of the tube ( 3 ) is made of plastic. Window lift, and / or motor vehicle with a cable ( 2 ) according to one of claims 1 to 9 or with a power transmission device ( 1 ) according to any one of claims 10 to 15. Window lift and / or motor vehicle according to claim 16, characterized in that the cable ( 2 ) is guided over at least one deflection roller.

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