DE102010037004B4 - Pneumatic vehicle tires - Google Patents

Abstract

Pneumatic vehicle tires with a tread (9), bead areas (1) with bead cores (2) and bead rubber profiles (3), which come into contact with the tire when mounted on a rim, furthermore with side walls (7), a belt package (8) made of belt layers (8a) and optionally belt bandage layers, and with a carcass ply (5) with strength supports running in the radial direction and embedded in a rubber coating, the tread (9) and additionally at least one further rubber component, in particular the rubber coating (5a) of the carcass layer (5) and/or the side walls (7) consist of or have an electrically non-conductive rubber mixture, and wherein electrically conductive passages establish an electrically conductive connection of this component or these components to at least one electrically conductive component or to the rim, wherein the electrically conductive passages are formed by at least one thread-, strand- or band-like, electrically conductive element (10), which spirally wraps the component while maintaining mutual distances between its sections (10a, 10b, 10c, 10'c, 10''c). or on edge edges, characterized in that either the component is the tread (9) or a tread part and the sections (10c, 10'c, 10''c) or the winding sections (10a, 10b) of the thread, strand- or band-like element (10) in the transverse direction of the tire and at an angle (α) ≤ 45 °, or that the component is the carcass ply (5) or a side wall (7), the sections (10c, 10'c, 10 ''c) or the winding sections (10a, 10b) of the thread-, strand- or band-like element (10) run at an angle of up to 45 ° to the radial direction.

Description

The invention relates to a pneumatic vehicle tire with a tread, bead areas with bead cores and bead rubber profiles, which come into contact with the tire when mounted on a rim, also with side walls, a belt package made of belt layers and optionally belt bandage layers, and with a carcass layer with radially extending, reinforcements embedded in a rubber lining, wherein the tread and additionally at least one further rubber component, in particular the rubber lining of the carcass ply and/or the side walls, consist of or have an electrically non-conductive rubber mixture, and wherein electrically conductive passages form an electrically conductive connection of this component or these components to produce at least one electrically conductive component or the rim, the electrically conductive passages being formed by at least one thread-, strand- or band-like, electrically conductive element, which spirally wraps the component while maintaining the mutual distances between its sections or included on edge edges.

It is known that in order to reduce the rolling resistance of tires it is advantageous to produce tire components, in particular the tread, from rubber mixtures with low hysteresis. The measures used in this regard include, in particular, the use of low-activity fillers, the use of a small amount of active filler or the use of silicon dioxide (silica) instead of carbon black. Each of these measures mentioned results in an increase in the electrical resistance of the rubber mixture or the component made from this mixture. These tire components, which are designed to have low rolling resistance, have such a high electrical resistance that they are no longer electrically conductive. The tire therefore no longer has sufficient electrical conductivity, which is necessary to dissipate electrical charges - as a result of the vehicle's electrostatic charge.

A pneumatic vehicle tire of the type mentioned is, for example, from CN 1 01 072 693 A known. This pneumatic vehicle tire has a tread made of a rubber material, bead areas that include bead cores encased in rubber, belt plies and a carcass embedded in a rubber material. Rubber strips are arranged in the side walls, which have several band-shaped, metallic, therefore electrically conductive elements, which include edge edges of components in the bead areas.

The one from the US 2007/0163690 A1 Known pneumatic vehicle tires have a tread, side walls, horn profiles and a carcass insert, the tread and the side walls consisting of electrically non-conductive rubber mixtures. According to one embodiment, the horn profile and the carcass rubber coating also consist of electrically non-conductive rubber mixtures. An electrically conductive passage is installed in the side wall area, which runs between the carcass insert and the horn profile, between the carcass insert and the side wall and between the tread and the radially outer end section of the side wall and extends to the outer surface of the tread. The electrically conductive passage is formed by a band-like electrically conductive element and includes a spiral-shaped portion which spirals over the circumference of the sidewall with respect to the axis of rotation of the tire. In a further embodiment, the horn profile consists of an electrically conductive rubber mixture and the spiral-shaped section ends at the horn profile. The tire should have low rolling resistance, while the dissipation of electrical charges should still be guaranteed.

The DE 1 227 794 A discloses a pneumatic vehicle tire with a tread, a carcass insert and a wire-shaped electrical conductor. According to a first embodiment, the conductor comprises a conductor section forming the cord structure and conductor sections located in the side walls. A preferred embodiment provides that the conductor forms the cord structure or has conductor sections located on the side walls. The conductor is connected to electrical contact connections located on the outer surface of the tire, preferably on the sidewall. By means of a current continuity tester connected to the contact connections, the condition of the cord structure, which cannot be determined from the outside, can be monitored.

A large number of patent documents deal with the production and implementation of electrically conductive passages in such tires in order to ensure sufficient electrical conductivity or to create conductive connections in the tire to electrically conductive components of the tire or to the rim. For example, from the DE 10 2008 058 881 A1 a pneumatic vehicle tire is known, the tread of which has an outer part - cap part - made of an electrically non-conductive rubber mixture and the side walls of which consist of an electrically conductive rubber mixture. Between the electrically non-conductive tread part and the electrically conductive sidewall, an electrically conductive passage is formed over the circumference of the tire by a wave-shaped element running in the circumferential direction, which is a strand is made of electrically conductive rubber material. From the EP 1 803 589 B1 A pneumatic vehicle tire is known in which electrically conductive sections between bead components and the tread are formed by elements made of an electrically conductive rubber mixture that are helically embedded in the sidewall rubber and run spirally around the axis of rotation of the tire. With the one from the EP 1 526 005 A2 In known pneumatic vehicle tires, an electrically conductive cord is provided, which runs on the outer side of the carcass ply and thus on the inside of the side wall made of rubber and extends between an electrically conductive component in the bead area and the electrically conductive belt which is also arranged radially within the tread. This cord thus forms an electrically conductive connection between the tread, which has low rolling resistance, and the rim. In addition, it is known to replace individual cords in the carcass layer with metallic, electrically conductive cords.

Reducing the rolling resistance of tires is becoming increasingly important. The use of rubber compounds that reduce rolling resistance in tires, including for body compounds, is an important topic. If, for example, the side walls or the rubber coating of the carcass ply are made of a non-conductive rubber mixture, the electrical conductivity of these components can no longer be ensured by a partial replacement of carcass cords or a one-sided placement of conductive elements on the carcass ply.

This is where the invention comes in, the task of which is to provide optimally functioning electrically conductive passages in the tire in a variety of variable ways that are easy to produce.

The task is solved according to the invention by
that either the component is the tread or a tread part and the sections or the winding sections of the thread-, strand- or band-like element run in the transverse direction of the tire and at an angle ≤ 45°,
or that the component is the carcass ply or a sidewall, with the sections or the winding sections of the thread-like, strand-like or band-like element extending at an angle of up to 45° to the radial direction.

Thread-, strand- or band-like elements therefore form either one or more spiral wrappings of the component in question or at least edge borders. Electrically conductive passages can therefore be formed in a particularly diverse way, especially in/on body components, such as the carcass layer or the side walls, which can be arranged variably in such a way that contact points to other conductive components or other conductive passages can easily be formed can be produced. The wraps or the enclosures can be attached in a simple and efficient manner to the raw components, for example the carcass ply or the sidewalls, before they are positioned on the tire building drum.

In a preferred embodiment of the invention, the electrically conductive passages are formed in such a way that individual thread-, strand- or band-like sections of the element cross one of the component sides, run around the edge edges of the component and end in short sections on the second component side.

It is not always necessary for the component in question to be wrapped around or crossed by the individual sections of the element provided according to the invention. It may also be sufficient for individual thread-, strand- or band-like sections to encompass at least one of the edge edges of the component and thus run as short sections along both sides of the component.

There are a variety of ways to form the electrically conductive element. In very simple embodiments of the invention, this can be a metallic filament or a cord composed of metallic filaments. The diameter of the filament or cord should be between 0.1 mm and 0.5 mm.

In a further embodiment variant of the invention, the electrically conductive element is a band or a strand made of an electrically conductive rubber mixture. Such a band-like element, like a metallic filament or a metallic cord, can be easily applied to the component in question during tire production.

In the case of a band-shaped design variant, its thickness should be between 0.1 mm and 0.5 mm and its width should be between 0.5 mm and 50 mm. A strand should have a diameter between 0.1 mm and 0.5 mm.

• 1 eine perspektivische Darstellung eines Teiles eines Umfangsabschnittes eines Fahrzeugluftreifens,
• 2 eine Schrägansicht eines Abschnittes einer Karkasslage eines Fahrzeugluftreifens vor deren Auflegen auf eine Reifenaufbautrommel,
• 3 das Grundprinzip einer Vorrichtung zum Umwickeln einer Karkasslage mit einem elektrisch leitfähigen Element,
• 4 eine Draufsicht auf einen Abschnitt eines Laufstreifens vor dessen Aufbringen auf eine Reifenaufbautrommel und
• 5 bis 7 unterschiedliche Ausführungsvarianten der Umfassung oder Umwicklung von Reifenbauteilen mit elektrisch leitfähigen Elementen.

Further features, advantages and details of the invention will now be described in more detail with reference to the drawing, which schematically shows several exemplary embodiments. Show it

• 1 a perspective view of part of a peripheral section of a pneumatic vehicle tire,
• 2 an oblique view of a section of a carcass ply of a pneumatic vehicle tire before it is placed on a tire building drum,
• 3 the basic principle of a device for wrapping a carcass ply with an electrically conductive element,
• 4 a top view of a section of a tread before it is applied to a tire building drum and
• 5 until 7 different design variants of enclosing or wrapping tire components with electrically conductive elements.

1 shows a view of a peripheral section of a pneumatic vehicle tire, which has bead areas 1 with bead cores 2 and bead rubber profiles 3, which come into contact with the rim, not shown, when the tires are mounted. The bead cores 2 are surrounded by a carcass ply 5 from axially inside to axially outside, which run along core profiles 6 arranged on the bead cores 2. On the inside of the tire, the carcass layer 5 runs along side walls 7 and radially within a belt package 8 consisting of at least two belt layers 8a and possibly belt bandage layers. On its inside, the tire is covered with an inner layer 4, which consists of an airtight rubber mixture. Radially outside the belt package 8 there is a tread 9, which can be designed in one or more parts in a known manner.

The carcass layer 5 consists in a known manner of a carcass rubber coating 5a ( 2 ) embedded reinforcements 5b ( 2 ), in particular made of a textile material, which run in the finished tire between the two bead regions 1 in the radial direction or essentially in the radial direction. In a tire designed according to the invention, the tread is 9, in a multi-part tread, at least the part in contact with the ground - the cap part - of the tread is 9 and additionally at least one further component, in particular the side walls 7, the rubber coating of the carcass layer 5 or at least the rubber coating a belt layer 8a or a belt bandage layer, electrically non-conductive or insufficiently conductive. The components mentioned consist of rubber mixtures that are not electrically conductive; they have a specific electrical resistance >10 ⁹ ohm*cm. Rubber parts whose specific electrical resistance is <10 ⁷ ohm*cm are considered electrically conductive within the meaning of the present application.

The lack of electrical conductivity of the rubber mixtures or the components made from these rubber mixtures is due to the use of low-activity fillers in these mixtures and/or the use of small amounts of active fillers and/or the replacement of soot as a filler by silicon dioxide (silica), whereby These measures can be taken individually or in any combination and reduce the rolling resistance of the tire. As a result of these measures, the electrical resistance of the relevant components is so high that sufficient electrical conductivity of the entire tire is no longer guaranteed.

In order to avoid potentially dangerous electrostatic charging of the vehicle, an electrically conductive connection of the tread 9 and the other electrically non-conductive components to the rim or the bead rubber profiles 3 that come into contact with it, which consist of an electrically conductive mixture, to care. This is achieved according to the invention by spirally wrapping or partially surrounding or enclosing electrically non-conductive components with an electrically conductive element 10, which in 1 in which one side wall 7 is indicated for illustration.

2 shows an example of a carcass ply 5 whose rubber mixture is not electrically conductive. The carcass ply 5 is spirally wrapped with an element 10, which is shaped like a thread, strand or band and consists of an electrically conductive material. A strand-like shaped element 10 is understood to mean one which has a round, in particular essentially circular cross-section, for example a rubber strand or a metallic cord. A thread-like element 10 can in particular be a metallic filament. The diameter of such elements is between 0.1 mm and 0.5 mm. Band-shaped electrically conductive elements 10 are understood to be those which have a thickness between 0.01 mm and 0.5 mm and a width between 0.5 mm and 50 mm. Band-shaped elements 10 can be electrically conductive rubber mixture strips, whereby the rubber mixture can also be applied to a carrier, for example to a fleece. The element 10 is wound onto the already cut carcass ply 5 prepared for placement on a tire building drum, not shown, with winding sections 10a, 10b running parallel to one another on each carcass ply side, with constant mutual distances between the winding sections 10a, 10b of preferably 5 cm to 25 cm. The winding pitch, the pitch angle α of the winding sections 10a, 10b on each of the carcass ply sides relative to the transverse direction, is a maximum of 45°, in particular a maximum of 30°, the pitch angle α of the winding sections 10a being from Pitch angle α of the winding sections 10b may differ. The pitch angle α is the angle that is spanned between the perpendicular to the component side and the winding. 2 shows a wrap around the carcass ply 5 with pitch angles α that match on both sides.

3 shows the basic structure of a device for wrapping a carcass ply 5 with a thread-, strand- or band-like element 10. On a frame 11 there is an annular carrier 12 on which a coil 14 is mounted, which runs in a ring-like manner along the carrier 12 is movable. The element 10 is wound on the spool 14. The carcass ply 5 is transported through the opening in the annular carrier 12, at the same time the coil 14 rotating along the ring and in this way the element 10 is wound around the carcass ply 5. In the finished tire, the windings of the electrically conductive element 10 form electrically conductive passages between the belt package 8 and the bead rubber profiles 3.

4 shows a top view of a section of a raw tread 9 before it is applied to a tire building drum with a wrapping of the element 10 with the same pitch angles α on the front and back.

5 shows schematically a winding pattern for a carcass ply 5 with different pitch angles α, the pitch angle α being approximately 30° on one side and 0° on the other side.

6 and 7 show variants of applying the element 10 to a carcass layer 5. In the in 6 In the embodiment shown, on one side of the carcass ply 5, in the figure on the top, there are element sections 10c which run parallel to one another and which run around the two longitudinal edges and end on the underside after short sections 10'c. The inclination angles α of the sections 10c, 10'c agree and amount to approximately 30°. At the in 7 In the embodiment shown, only the lateral edges of the carcass ply 5 are covered by sections/pieces 10''c from the element 10, in particular at uniform distances from one another. The element sections 10''c can have matching or non-matching lengths on both sides of the component and they can be arranged at the same or different pitch angles α. Such enclosures can be provided primarily as an additional measure if, for example, the necessary electrical connections are to be made to other passages or other components.

The invention is not limited to the embodiments shown and described. As mentioned, it is possible to wrap or surround the edge of the belt package, individual belt layers, the belt bandage, the side walls and the like according to the invention with electrically conductive elements 10. If several components in a tire are provided with electrically conductive passages according to the invention, care must be taken when designing and arranging them, if necessary, that the passages on different components in the finished tire come into contact with one another, so that crossing points with electrical contact are created. The individual sections of the enclosures can have different lengths and different inclination angles - even with one and the same component.

Reference symbol list

1

Bead area

2

bead core

3

Beaded rubber profile

4

Inner layer

5

Carcass location

5a

Carcass rubber coating

5b

Strength members

6

Core profile

7

Side wall

8th

Belt pack

8a

Belt layers

9

Treads

10

element

10a

winding section

10b

winding section

10c

Section

10'c

Section

10''c

Section

11

frame

12

carrier

14

Kitchen sink

α

Pitch angle

Claims (9)

Pneumatic vehicle tires with a tread (9), bead areas (1) with bead cores (2) and bead rubber profiles (3), which come into contact with the tire when mounted on a rim, also with side walls (7), a belt package (8) made of Gür teller layers (8a) and optionally belt bandage layers, and with a carcass ply (5) with strength supports running in the radial direction and embedded in a rubber coating, the tread (9) and additionally at least one further rubber component, in particular the rubber coating (5a) of the carcass layer (5 ) and / or the side walls (7), consist of or have an electrically non-conductive rubber mixture, and wherein electrically conductive passages produce an electrically conductive connection of this component or these components to at least one electrically conductive component or to the rim, wherein the electrically conductive passages are formed by at least one thread-, strand- or band-like, electrically conductive element (10), which spirals the component while maintaining mutual distances between its sections (10a, 10b, 10c, 10'c, 10''c). wrapped or encompassed on edge edges, characterized in that either the component is the tread (9) or a tread part and the sections (10c, 10'c, 10''c) or the winding sections (10a, 10b) of the thread, strand - or band-like element (10) runs in the transverse direction of the tire and at an angle (α) ≤ 45 °, or that the component is the carcass layer (5) or a side wall (7), the sections (10c, 10'c, 10''c) or the winding sections (10a, 10b) of the thread-, strand- or band-like element (10) run at an angle of up to 45 ° to the radial direction. Pneumatic vehicle tires Claim 1 , characterized in that individual thread-, strand- or band-like sections (10c) cross one of the component sides, run around the edge edges of the component and end in short sections (10c') on the second component side. Pneumatic vehicle tires Claim 1 , characterized in that individual thread-, strand- and band-like sections (10''c) comprise at least one edge of the component and thus run as short sections along both sides of the component. Pneumatic vehicle tires according to one of the Claims 1 until 3 , characterized in that the electrically conductive element (10) is a metallic filament. Pneumatic vehicle tires according to one of the Claims 1 until 3 , characterized in that the electrically conductive element (10) is a metallic cord composed of filaments. Pneumatic vehicle tires Claim 4 or 5 , characterized in that the filament or cord has a diameter between 0.1 mm and 0.5 mm. Pneumatic vehicle tires according to one of the Claims 1 until 3 , characterized in that the electrically conductive element (10) is a band or strand made of an electrically conductive rubber mixture. Pneumatic vehicle tires Claim 7 , characterized in that the band has a thickness between 0.1 mm and 0.5 mm and a width between 0.5 mm and 50 mm. Pneumatic vehicle tires Claim 7 , characterized in that the strand has a diameter between 0.1 mm and 0.5 mm.

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