DE102018213478A1 - Vehicle tires - Google Patents

Abstract

The invention relates to a pneumatic vehicle tire for cars with a carcass (2), a tread (6) and a belt (7) with belt layers (7a, 7b), which is covered radially on the outside by a belt bandage (8) with reinforcements oriented approximately in the circumferential direction , wherein the belt bandage (8) has at least one belt bandage layer (8a), which - viewed in the tire cross-section - consists of three sections, namely a central section (10) and two side sections (11, 12), one side section (11) on the left and one The side section (12) is arranged to the right of the center section (10) and the strength members of the two side sections (11, 12) have the same cords made of at least two twisted yarns. The invention is characterized in that the strength members in the center section (10) are monofilaments are.

Description

The invention relates to a pneumatic vehicle tire for cars with a carcass, a tread and a belt having a belt layer, which is covered radially on the outside by a belt bandage with reinforcements oriented approximately in the circumferential direction, the belt bandage having at least one belt bandage layer which, viewed in the tire cross section, consists of three Sections consists, namely a center section and two side sections, one side section being arranged to the left and one side section to the right of the center section, and the strength members of the two side sections having the same cords made of at least two twisted yarns.

Such a vehicle tire is, for example, from the JP 2007 1967 40 A or from the JP 2009 1730 66 A known. The belt bandage layer is formed in three parts with a central section and two side sections, the strength members in the middle section having construction x1 (a twisted multifilament yarn) and the reinforcement members in the side sections having construction x2 (two multifilament yarns twisted together). In the JP 2009 1730 66 A are the strength members of all three sections of the belt bandage layer made of PA6.6, in the JP 2007 1967 40 A the strength members of the middle section are made of PA6.6 and the strength members of the side sections are made of PEN. This construction of the belt bandage has advantages in terms of road noise, in terms of high-speed performance as well as in terms of rolling resistance and flat spotting. The latter two advantages are achieved by using a reinforcement of construction x1 (a twisted multifilament yarn), since the reinforcement has a smaller diameter than a comparable x2 cord of the same overall fineness, resulting in a thinner calendered bearing with less rubber material.

In general, it is well known to the person skilled in the art to arrange a belt bandage in pneumatic vehicle tires. The belt bandage is formed in one or more layers, at least covers the belt edges and has reinforcement bars running approximately in the circumferential direction and parallel and embedded in a rubber mixture. "Around the circumferential direction" means an angle of 0 ° to 5 ° with respect to the tire circumferential direction.

The belt bandage is applied in the production of tires in the form of layers, strips or individual reinforcements with reinforcements embedded in an unvulcanized rubber mixture, which are wound or wound onto the belt. The strength members are embedded in rubber by a group of essentially parallel thread-like strength members, which are usually thermally and / or pretreated with impregnation in a manner known to the person skilled in the art with an impregnation for better adhesion to the embedding rubber, in the longitudinal direction of a calender or passes through an extruder for coating with the rubber mixture. Or strength members are used that are sticky impregnated and can be processed without a calendered adhesive mixture.

The belt bandage is used in particular in high-speed use to limit the elevation of the tire by the centrifugal forces that occur during driving. In addition, the reinforcements of the belt bandage should hold down the belt layers, in particular the belt edges for fast running strength and durability. For this purpose, greater forces, in particular tensile / compressive alternating loads, must be bound in the shoulder areas of the pneumatic vehicle tire than in the central area.

It is problematic that, in the case of cuts in the tread, which extend to the belt, which usually has steel cords, moisture can be transported through the yarn structure of the strength members of the belt bandage because the filaments lie loosely in the interior. This can accelerate possible corrosion of the belt, which would lead to a reduced durability of the pneumatic tire.

In tire development, there is a constant strive to be able to manufacture an equally good or better vehicle tire more cheaply.

It is therefore the object of the present invention to provide a high-speed-resistant and rolling resistance-optimized pneumatic vehicle tire with a belt bandage, which is inexpensive with improved durability.

According to the invention, the object is achieved in that the reinforcements in the central section are monofilaments.

It is essential to the invention that the reinforcements in the middle section are inexpensive monofilaments, while the reinforcements in the side sections are cords of construction x2 or higher. The cords of construction x2 or higher are arranged in the side sections in which dynamic tensile / alternating loads occur and the cords are resistant to these loads. These tensile / alternating loads occur less in the middle section, so that surprisingly monofilaments can be used there without disadvantages with regard to tire durability. The monofilaments also have the advantage that, due to their massive compactness, they cannot transport moisture and therefore do not accelerate belt corrosion in the event of possible cuts through the tread to the belt.

Monofilaments are cheaper to manufacture than (multifilament) yarns or cords because the twist process is eliminated.

“Monofilament” means a single solid filament with a practically endless length. The term "reinforcement" includes both the monofilament and the cord. "Strength members of the construction x2 or higher" means cords with a construction made of two or more multifilament yarns, which are twisted together to form the end. A "construction x2 or higher" means a construction x3, x4 etc.

It is expedient if the two side sections are arranged next to the central section, that is to say without overlapping with the central section. There is no local thickening of material because there is no overlap of the sections. The wear of the vehicle tire is positively influenced.

It is advantageous if the density of the reinforcement in the middle section is less than the density of the reinforcement in the side sections, preferably the reinforcement in the middle section is in a density ≤ 60% with respect to the density of the reinforcement in the side section, particularly preferably in a density ≤ 50% in relation to the density of the reinforcement in the side section. The lower density of the monofilaments gives both an additional cost advantage and an improved rolling resistance of the tire.

It is expedient if the end of the side sections facing the central section is at a distance of 5 mm - 30 mm, preferably a distance of 5 mm - 15 mm, from the outer end of the widest belt layer, the distance being measured in the axial direction. The comparatively small edge areas maximize the use of the less expensive material in the middle section.

In a specific embodiment of the invention, the strength members in the central section are monofilaments and the strength members in the two side sections are of construction x2.

In another embodiment of the invention, the strength members in the middle section are monofilaments and the strength members in the two side sections have the construction x3.

It is advantageous if the diameter of the monofilament of the central section corresponds approximately to the diameter of the reinforcement of the side section and has a diameter deviation of 0 to 17%, preferably 0 to 10%, particularly preferably 0 to 5%. This creates approximately the same layer thickness of the side sections with the center section, as a result of which, for example, the tire runout and the abrasion are not influenced.

In a specific embodiment of the invention, the monofilaments of the middle section and the strength members (cords) of the side sections are made of the same material, such as polyamide, preferably PA6.6, PA or PES, preferably PET or combinations thereof. PET is particularly preferred because it is inexpensive and well suited for use in the belt bandage.

In an alternative embodiment of the invention, the monofilaments of the center section are made of a different material than the reinforcement (cords) of the side sections, such as the side sections made of PA6.6 or PA and the center section made of PET or PA6. A mixed equipment of the winding drum makes it possible to get the best out of cost-effective production and tire properties.

In a preferred embodiment of the invention, the monofilaments of the central area have a diameter of 0.40 mm and the cords of the side sections have the construction 470 dtex x 2 with a cord diameter of 0.40 mm, the monofilaments of the central area being arranged in a density of 60 epdm and the cords of the side sections being arranged in a density of 130 epdm.

In a further preferred embodiment of the invention, the monofilaments of the central area have a diameter of 0.60 mm and the cords of the side sections have the construction 1400dtex x 2 with a cord diameter of 0.64 mm, the monofilaments of the central area having a density of 48 epdm and the cords of the side sections are arranged in a density of 110 epdm.

"Epdm" stands for "ends per dm" and indicates the density in which the strength members are arranged in the reinforcement layer, here: in the belt bandage layer sections.

It is useful if the belt bandage has the construction 1-1-1 or 2-2-2 or 2-1-2 or 3-2-3. As a result, the belt bandage can be adapted well to the desired requirements. The number mentioned corresponds to the number of belt bandage sections lying one above the other and the list corresponds to the sequence: side section - middle section - side section.

• - für einen x2-Kord in einem Bereich von 80 bis 270, vorzugsweise in einem Bereich von 140 bis 210 liegt und
• - für einen x1- Festigkeitsträger in einem Bereich von 10 bis 100, vorzugsweise in einem Bereich von 30 bis 80 liegt,

wobei α=Twist [t/m] x (Feinheit [tex]/1000)^1/2.It is useful if the twist factor α of a cord of the side sections

• for a x2 cord is in a range from 80 to 270, preferably in a range from 140 to 210 and
• for a x1 strength member lies in a range from 10 to 100, preferably in a range from 30 to 80,

where α = twist [t / m] x (fineness [tex] / 1000) ^1/2 .

The following table shows the two preferred exemplary embodiments of the belt bandage with a belt bandage layer of the construction 1-1-1 of a vehicle tire according to the invention: Table Example No. strengthening support Strength member diameter [mm] LASE 4% [N] LASE 4% [N / dm] epdm 1 side portion 470detx x 2 0.40 12 1600 130 mid section monofilament 0.40 27 1600 60 2 side portion 1400detx x 2 0.64 30 3300 110 mid section monofilament 0.60 67 3200 48

Construction 1-1-1 means: 1 layer side section - 1 layer center section - 1 layer side section.
"LASE" stands for Load At Specific Elongation and means strength at a given stretch, here 4% stretch.

In example 1, the two side sections have cords of construction 470dtex x 2, preferably made of PA6.6 with a diameter of 0.40 mm, while monofilaments made of preferably PA6.6 with a diameter of 0.40 mm are used in the middle section. In order to obtain a cheap same LASE 4% in N / dm in the side section and middle section, the cords of the side sections are arranged in a density of 130 epdm and the monofilaments in the center section in a much lower density of only 60 epdm.

In example 2, the two side sections have cords of construction 1400 dtex x 2, preferably made of PA6.6 with a diameter of 0.64 mm, while monofilaments made of preferably PA6.6 with a diameter of 0.60 mm are used in the middle section. In order to obtain a cheap same LASE 4% in N / dm in the side section and middle section, the cords of the side sections are arranged in a density of 110 epdm and the monofilaments in the middle section in a much lower density of only 48 epdm.

• 1 einen Querschnitt durch einen Fahrzeugluftreifen;
• 2 einen Querschnitt durch den Gürtel und die Gürtelbandage des Fahrzeugluftreifens der 1.

Further features, advantages and details of the invention will now be described with reference to the figures, which represent a schematic embodiment. The shows:

• 1 a cross section through a pneumatic vehicle tire;
• 2 a cross section through the belt and the belt bandage of the pneumatic vehicle tire 1 ,

The 1 shows a cross section through a pneumatic vehicle tire for a passenger car during the 2 a cross section through the belt and the belt covering the belt bandage of the pneumatic vehicle tire 1 shows. Both figures are described below together. The essential components that make up the pneumatic vehicle tire shown are a largely air-impermeable inner layer 1 , a carcass 2 , which in a conventional manner from the zenith area of the pneumatic vehicle tire over the side walls 3 down to the bead areas 4 enough and there by looping tensile bead cores 5 is anchored radially above the carcass 2 profiled treads 6 and one between the tread 6 and the carcass 2 arranged, two belt layers 7a . 7b containing belt 7 , which radially outside with a belt bandage 8th is covered, which is a single belt bandage layer 8a includes. The belt bandage layer 8a covers the belt including its belt edges 9 from. The belt bandage layer 8th has strength members (not shown) which are wound parallel and approximately in the circumferential direction of the pneumatic vehicle tire along its axial width.

The belt bandage layer 8a consists of three sections arranged side by side: a middle section 10 and one each to the middle section 10 adjacent side section 11 . 12 , Thus, the belt bandage layer 8a construction 1-1-1. The two side sections 11 . 12 are without overlap with the middle section 10 arranged. The middle section 10 pointing end 13 of the side sections each has a distance 14 from 5 mm - 15 mm to the nearest outer end of the widest belt layer 15 on, the distance 14 in the axial direction aR is measured. The strength members in the middle section 10 are monofilaments and the reinforcement in the two side sections 11 . 12 have the construction x2, with all strength members of the belt bandage layer 8a made of the same material, PA6.6. The two side sections 11 . 12 have cords of construction 470dtex x 2 with a diameter of 0.40 mm, while in the middle section 10 Monofilaments with a diameter of 0.40 mm are used. To in the side section 11 . 12 and middle section 10 To get a cheap same LASE 4% in N / dm are the cords of the side sections 11 . 12 with a density of 130 epdm and the monofilaments in the middle section 10 arranged in a density of 60 epdm.

LIST OF REFERENCE NUMBERS

1

Innenschicht

2

Karkasse

3

Seitenwand

4

Wulstbereich

5

Wulstkern

6

Laufstreifen

7

Gürtel

7a 1.

Gürtellage

7b 2.

Gürtellage

8

Gürtelbandage

8a

Gürtelbandagenlage

9

Gürtelkante

10

Mittenabschnitt

11

Seitenabschnitt

12

Seitenabschnitt

13

Ende des Seitenabschnittes

14

Abstand

15

Ende der breitesten Gürtellage

rR

radiale Richtung

aR

axiale Richtung

(Part of the description)

1

inner layer

2

carcass

3

Side wall

4

bead

5

bead

6

tread

7

belt

7a 1.

belt layer

7b 2.

belt layer

8th

belt bandage

8a

Belt bandage ply

9

belt edge

10

mid section

11

side portion

12

side portion

13

End of page section

14

distance

15

End of the widest belt layer

rR

radial direction

aR

axial direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• JP 2007196740 A [0002]
• JP 2009173066 A [0002]

Claims (13)

Pneumatic vehicle tires for cars with a carcass (2), a tread (6) and a belt layer (7a, 7b) having a belt (7), which is covered radially on the outside by a belt bandage (8) with reinforcement bars oriented approximately in the circumferential direction, the belt bandage (8) has at least one belt bandage layer (8a), which - viewed in tire cross-section - consists of three sections, namely a central section (10) and two side sections (11, 12), one side section (11) on the left and one side section (12) is arranged to the right of the central section (10) and the reinforcements of the two side sections (11, 12) have the same cords of at least two twisted yarns, characterized in that the reinforcements in the central section (10) are monofilaments. Pneumatic vehicle tires after Claim 1 , characterized in that the two side sections (11, 12) are arranged next to the central section (10), ie without overlapping with the central section (10). Pneumatic vehicle tires after Claim 1 or 2 , characterized in that the density of the reinforcement in the central section (10) is less than the density of the reinforcement in the side sections (11, 12), preferably the reinforcement in the central section (10) is in a density ≤ 60% with respect to the density the reinforcement in the side section (11, 12), particularly preferably in a density ≤ 50% with respect to the density of the reinforcement in the side section (11, 12). Pneumatic vehicle tire according to one of the preceding claims, characterized in that the end of the side sections (13) facing the central section (10) each has a distance (14) of 5 mm - 30 mm, preferably a distance (14) of 5 mm - 15 mm to has the outer end of the widest belt layer (15), the distance (14) being measured in the axial direction (aR). Pneumatic vehicle tire according to one or more of the preceding claims, characterized in that the strength members in the middle section (10) are monofilaments and the strength members in the two side sections (11, 12) have the construction x2. Pneumatic vehicle tires according to one or more of the preceding Claims 1 to 4 , characterized in that the strength members in the middle section (10) are monofilaments and the strength members in the two side sections (11, 12) have the construction x3. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the diameter of the monofilament of the center section (10) corresponds approximately to the diameter of the reinforcement of the side section (11, 12) and a diameter deviation of 0-17%, preferably 0-10%, particularly preferably has from 0-5%. Pneumatic vehicle tire according to one or more of the preceding claims, characterized in that the monofilaments of the center section (10) and the strength members of the side sections (11, 12) are made of the same material, such as polyamide, preferably PA6.6, PA or PES, preferably PET. Pneumatic vehicle tire according to one of the preceding Claims 1 - 8th characterized in that the monofilaments of the center section (10) are made of a different material than the strength members of the side sections (11, 12), such as the side sections made of PA6.6 or PA and the center section made of PET or PA6. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the monofilaments of the central region (10) have a diameter of 0.40 mm and the cords of the side sections (11, 12) have the construction 470dtex x2 with a cord diameter of 0.40 mm , wherein the monofilaments of the central region (10) are arranged in a density of 60 epdm and the cords of the side sections (11, 12) are arranged in a density of 130 epdm. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the monofilaments of the central region (10) have a diameter of 0.60 mm and the cords of the side sections (11, 12) have the construction 1400dtex x2 with a cord diameter of 0.64 mm, wherein the monofilaments of the central region (10) are arranged in a density of 48 epdm and the cords of the side sections (11, 12) are arranged in a density of 110 epdm. Pneumatic vehicle tire according to at least one of the preceding claims, characterized in that the belt bandage (8) has the construction 1-1-1 or 2-2-2 or 2-1-2 or 3-2-3. Pneumatic vehicle tire according to at least one of the preceding claims, characterized in that the twist factor α of a cord of the side sections - for a x2 cord is in a range from 80 to 270, preferably in a range from 140 to 210 and - for a x1 strength member in is in a range from 10 to 100, preferably in a range from 30 to 80, where α = twist [t / m] x (fineness [tex] / 1000) ^1/2 .

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