DE2000281A1 - Push-pull type control cables - Google Patents

Description

DR. ING. E. HOFFMANN · DIPL. ING. W. EITLE DR. RER. NAT. K. HOFFMANN

P ATE NT TO WALTE

D-8000 MÖNCHEN 80 MARIA-THERESIA-STRASSEi TELEPHONE (0811) 441061

298

Hiroshi Tada
Yokohama / Japan

Push-pull type control cables

The invention relates to a push-pull type control cable, which consists of a tubular housing and a cable member extending therethrough. She relates in particular on its structure, which is designed so that the access of water and dust is avoided and that the cable is lubricated for smooth axial movement in relation to the surrounding housing will·

Control cables of the type described are used in automobiles Widely used to operate the clutch, handbrake, and other devices. Because of their attachment in places that are in contact with foreign matter, such as

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However, they do allow water and dust with the cable Subject to corrosion and other undesirable effects

It has therefore become customary to cover the control cables of the type described together with an elastic sheath Use to prevent water droplets, dust and other foreign matter from getting into the space between to prevent the cable and the housing.

Such wrappings have however not proven to be satisfactory proven, as they allow the entry of more or less large amounts of foreign matter, what is on it This is due to the fact that the cable structure, which consists of strands, consists of fine wires twisted together are formed, an uneven outer KaDeloberflache which has fine depressions as well as fine spaces between the strands and between the wires in each Has strand of the cable. This fact causes that the cable is exposed to corrosion phenomena, whereby Cable breaks etc. can occur.

In addition, since the control cables are usually arranged in a curved state, the cable member is exposed to friction with the inner peripheral surface of the housing at all times of use. To overcome these difficulties it has already become common to use a liquid or semi-liquid lubricant, like oil or grease, which also helps prevent rust. The use of such However, lubricant is because of its high consumption and their limited lubrication and rust preventive properties have not been satisfactory. Fats generally excel the liquid lubricants in terms of them

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Adhesion properties and their water and dust repellent properties Effects, however, have the disadvantage that they are under pressure by the dust coating with which the Core or cable element is held in sliding contact, seep to the outside. Another disadvantage of using it of fats is that they help to make the operation of the cable cumbersome by they allow the relative movement between the cable element and the housing, especially when there is excess grease is filled in between.

It can thus be summarized that the conventional control cables of the iiruek train type in more- ^

various aspects, such as corrosion prevention, the motion transmission performance and the feeling of the operator are inadequate when operating the cable.

The present foundation aims to address this deficiency which the well-known Control cones still attached, remove and a control cone of the push-pull type is available so iconstruierx is that the entry of water, dust and other foreign matter in the space between the tubular housing and the one extending therein Cable element is effectively prevented

Bin further object of the invention is to provide a control cable of the type described which is especially designed so that the entry of any external water, which tends, due to the capillary to infiltrate into the cable structure, is avoided.

The invention therefore relates to a control cable from the pressure-Type, made of a wire cable and a tube-

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shaped housing and which is characterized in that the wire cable is impregnated and coated with a lubricating material which is solid at ordinary temperature, but which liquefies when heated, such as paraffin wax or synthetic resins. This lubricating material solidifies and forms a uniform solid layer which covers the entire surface of the wire cable and fills the spaces between the strands and between the wires that make up the individual strands of the cable.

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1 is an axial cross section of an end part of a Control cable of the push-pull type according to the invention.

Fig. 2 is an enlarged partial cross-section showing the Figure 3 shows the end structure of the housing through which the cable extends.

3 shows a section of the cable taken along the line III-III in FIG. 1.

In the figures, 1 represents a wire cable made up of a number, e.g. 7, of strands 11, which are twisted with each other and each of which consists of one Multiplicity, e.g. 7, consists of twisted steel wires 10 at each end of the cable an operating part 4 is attached, which, for example, is connected to the mechanism of the clutch control of a vehicle or a similar device is. The cable 1 is along its substantial length of a tubular, flexible housing 7 old of its free aohsial movement surrounded. The tubular housing 7

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is usually made from a tightly wound spiral coil of steel or other metal wire of great length

end up

manufactured. About the opposite / of the tubular Housing 7 caps 6 are tightly pulled over. Each has a dust cover at its outer end 3 · The dust cover 3 is provided with a central opening 5 through which the cable 1 extends in a sliding manner.

The control cable is of the conventional type as far as the structure described above is concerned. What is new, however, is that the wire cable 1 carries a solid layer 2 of lubricating material which is formed along its entire length. The lubricating material layer may be% formed that the wire cord 1 in a bath of a lubricant such as paraffin wax or synthetic resin which is solid at ordinary temperature, however, is liquefied upon heating is immersed, whereby the entire peripheral surface of the wire cable by filling the interstices between the cable strands and between the wires in each strand. The cable is then cooled to room temperature, which solidifies the lubricant that has been applied to the cable and impregnated it.

It can be seen that the resulting layer of the λ

Lubricant is firm and uniform on the cable and that it adheres firmly to the cable. Accordingly, at Operation of this control cable the wire cable 1 opposite the housing 7 and through the opening 5 in each of the dust covers 3 freely slidable, which is due to the intermediate layer of the solid circumferential layer of the lubricant 2, the the cable 1 sticks, is due.

The lubricant 2 can be of any conventional type.

However, Bb becomes paraffin wax with a melting point between

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51.7 and 57.2 ⁰ C preferred. Bs can also synthetic resins can be used as Polychioräthylen having an average molecular weight of 2000 to 5000 and a melting point of 92.2 to 109 »4 ⁰ C with good results. This material can be dissolved in benzene or toluene, creating a solution bath for immersion of the cable. In this Pali, the lubricating resin forms the desired solid layer on the cable 1 when the solvent evaporates after it has been taken out of the bath.

To compare the performance and the feeling During operation, experiments were carried out with a control cable A, which had been made according to the invention and carried out a conventional pattern B.

The Kaoel A consisted of an axial KaDeI with a diameter of 3 mm, which had a layer (2 in JJ'ig. $) Made of paraffin with a melting point of 0, 0 ° and of a tube-shaped housing 7, which was shaped like a Auigespulxen ötahlronrs, which was lined with rolyoxyethylene, took.

The structure of pattern B was similar to pattern A, with the exception that the urahtkaDel instead of the Paraifinachicht 2 of pattern A coated with commercially available iaU was.

Below are the reviews of companies that have been carried out a thousand times with each sample

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200Q281

Pattern A Pattern B

transmission power, fo

feeling

88

excellent rough feeling,

some resistance

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Claims (3)

Claims i1. i Control cable of the push-pull type, consisting of a wire cable composed of a plurality of twisted wire strands and a tubular housing which surrounds the main length of the cable and which is provided with caps attached at opposite ends through which the Wire cable, characterized in that an annular layer of solid lubricant is formed around the wire cable, which is done by applying the lubricant in liquid Zm tand to the cable so that the entire surface of the wire cable filling the spaces between the wire strands and covered between the wires in each strand of the cable and allowing the lubricant so applied to solidify at ordinary temperature. 2. Control cable according to claim 1, characterized in that the lubricant is paraffin wax with a melting point between 51 »7 and 57 _? _2 C is. That the lubricant is 3. A control cable according to claim 1, characterized Polychloräthylen having a melting point from 92.2 to 109.4 ⁰ C. 4. A method of manufacturing control cables of the push-pull type according to claim 1, characterized in that a wire cable composed of a plurality of twisted wire strands is immersed in a bath of a hot molten lubricant which is solid at ordinary temperature, throughout the whole Surface of the wire cable by filling the spaces between the wire strands and between the wires in each strand to be loaded 0 0 98 38 / UTA layer and that on this the cable from your lubricant bath is taken out to cool the lubricant, whereby this under jjildung a solid layer on the Wire cable sticks at ordinary temperature. 009838 / U U Blank page