WO2015051932A1

WO2015051932A1 - Pneumatic vehicle tire

Info

Publication number: WO2015051932A1
Application number: PCT/EP2014/066446
Authority: WO
Inventors: Ulrich Behr
Original assignee: Continental Reifen Deutschland Gmbh
Priority date: 2013-10-10
Filing date: 2014-07-31
Publication date: 2015-04-16
Also published as: CN105636801A; CN105636801B; DE102013111197B4; DE102013111197A1

Abstract

The invention relates to a pneumatic vehicle tire having a tread having tread strips, such as profile block rows or profile ribs, spaced apart from each other by grooves, which profile strips extend over the entire circumference of the pneumatic vehicle tire and are bounded outwardly in the radial direction R by a radially outer surface (4) forming the ground contact surface, characterized in that, in at least one profile strip (1), a plurality of hollow bodies (8) surrounded by the rubber material of the profile strip (1) are formed, said hollow bodies being spaced apart from each other and being distributed over the profile strip (1), of which hollow bodies each is connected to the radially outer surface (4) of the profile strip (1) by exactly one cross-slit-shaped fine cut (5).

Description

description

Vehicle tires

The invention relates to a pneumatic vehicle tire with a profiled tread with grooves of spaced apart profile bands, which extend over the entire circumference of the vehicle pneumatic tire and in the radial direction R outwardly bounded by a radially outer surface forming the ground contact surface.

Such pneumatic vehicle tires are known.

When driving with such pneumatic vehicle tires more or less disturbing noises. To reduce such disturbing noises has been occasionally

proposed to form Helmholtz resonators in the tread pattern, with which certain, high-frequency sound waves can be absorbed. Such designs are known for example from EP0989000A2. The formation of such Helmholtz resonators, for the closed spaces as possible with a defined small opening are required in a tire is very expensive to manufacture, both in the indentation as well as in the shape and in the defined size training. From DE1605657A1 it is known to form for the venting and for a good drainage in profile bands fine incisions, each extending over the entire width of the profile strip and are formed along its entire extension length at its radially inner extension portion extended to a passageway. Along the extension of such a sipe this is additionally arranged by several along the extension of the sipe and the passageway one behind the other and transverse to the direction of extension of the sipe and across the Cut drainage channel formed trained vent cuts. In order to ensure good drainage with sufficient ventilation, the sipe extends with the at its radially inner

Extension end trained passageway thereby from the one profile band limiting groove to the other profile band limiting groove, wherein the

To achieve good ventilation, cut as many vent cuts as possible to the sipe.

The invention has for its object to enable the formation of pneumatic vehicle tires with improved sound absorption.

The object is fiction, according to the formation of a pneumatic vehicle tire with a profiled tread with by grooves of spaced apart profile bands which extend over the entire circumference of the vehicle pneumatic tire and in the radial direction R outwardly bounded by a surface contacting surface forming radially outer surface according to the features of claim 1, wherein spaced apart in at least one profile strip from each other and distributed over the profile strip a plurality of rubber material of the profile band enclosed hollow bodies are formed, each of which exactly by a cross-shaped

Fine incision are connected to the radially outer surface of the profile strip.

With this design, the formation of Helmholtz resonators in the profile band and thus in the tire can be implemented in a simple manner. The closed cavities in the rubber material can be easily formed and shaped, wherein the required shape for molding or molding through the cross-shaped sipe can be easily pulled out of the tread pattern for demolding. The cross-slot-shaped sipe allows despite ensuring the only possible for the formation of a Helmholtz resonator connecting gap as a good opening for pulling out the Ausformkörpers. Thus, the Helmholtz resonator despite the formation of an enclosed hollow body in the

Profile strip simply be formed and shaped. This is how to shape of Fine incisions usual, a the incision corresponding to trained, here crossed lamellar plate with a correspondingly thickened trained for forming the hollow body lamellar plate portion at its extending into the profile radially inner extension end sufficient. When molded in the vulcanization mold, the rubber material surrounds it as a molding core for forming the

Hollow body thickened trained lamella sheet section and the cruciform lamellar plate. After vulcanization is in the usual way by opening the

Vulkanisationsform the molding segment serving for shaping with the lamella plate in the radial direction R of the tire to the outside of the tire, said serving as a core for forming the hollow body formed on the lamella plate thickened

Slat sheet metal section can be removed in a simple manner with the lamella plate under opening the cross-shaped sipes.

In this way, it is possible to form Helmholtz resonators in the tire selectively over the profile band. By choosing the dimensions of the hollow body and correspondingly adapted dimensioning of the cruciform fine incision, it is possible to absorb disturbing frequencies in a very targeted manner.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 2, wherein the hollow body is cylindrical or pipe-section-shaped with the rubber material completely closed end surfaces, wherein the axis of the cylinder or pipe section parallel to the direction of extension of a first of the two intersecting slot portions of the cross slot shape of the

Fine incision is formed and wherein the cross-slot-shaped sipe, starting from the lateral surface of the cylindrical or tubular section-shaped

formed hollow body - in particular in the radial direction R - extends outwardly to the radially outer surface of the profile strip is formed. Through this

Training a particularly simple demolding can be ensured. Particularly advantageous is the formation of a vehicle tire according to the features of claim 3, wherein the cylindrical or the pipe section-shaped Hollow body having a maximum extension length L formed in its axial direction and the first slot portion of the cross-slot shape of the sipe with a maximum extension length C is formed with L <C. As a result, the emergence of outbreaks at the edges of the hollow body can be prevented during the molding particularly effective.

Particularly advantageous for the absorption of certain, particularly disturbing frequencies with technically simple feasibility is the formation of a vehicle tire according to the features of claim 4, wherein the first of the two intersecting slot portions of the cross-slot shape of the sipe with a perpendicular to its

Extending direction measured gap width di is formed, wherein the second of the two intersecting slot portions of the Phillips shape of the sipe is formed with a measured perpendicular to its extension direction gap width d ₂ and a maximum extension length B, and wherein the hollow body in the plane perpendicular to its cutting planes is formed with a width D (2 di) <D <(5B) measured in a direction perpendicular to the radial direction of extension of the tire.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 5, wherein the cylindrical shape or the tubular shape of the hollow body in the

Sectional planes is formed perpendicular to its axis with a circular cross-section of the diameter D or an elliptical or oval cross-section with measured in the larger major axis of the ellipse or the oval diameter D. This design of the hollow body is optimized for easy insertion and Ausformen.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 6, wherein the cross-slot-shaped sipe is formed with a measured from the radially outer surface in the radial direction R of the tire inwardly measured to the hollow body depth hi with hi <3mm.

In this way, a sufficiently long connecting channel can be ensured in a simple manner to achieve an effective Helmholtz effect. Particularly advantageous is the formation of a vehicle tire according to the features of claim 7, wherein the hollow body is formed with an measured in the radial direction R of the tire extension height h ₃ , wherein the cross is slot-shaped

formed fine incision is formed with a measured from the radially outer surface in the radial direction R of the tire inwardly measured to the hollow body depth hi, and wherein the hollow body in the radial direction R of the tire inwardly to a position at the maximum distance h ₂ extending from the radially outer surface is formed with hi = (h ₂ - h ₃ ). This allows the

Connection channel length can be implemented in a simple manner with maximized.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 8, wherein D> h _{3 is} formed. This can easily the

Hollow body pronounced and formed particularly effective.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 9, wherein distance h _{2 is formed} with 1ι ₂ <Ρτ, where Ρχ is the maximum in the profile band bounding circumferential grooves formed tread depth, and wherein P _T in particular with 5mm <P _T <8,5mm is formed.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 10, wherein the gap widths di and d ₂ with 0.4mm <di <l, 2mm and

0.4mm <di <l, 4mm are formed, in particular di <d _{2 is} formed.

As a result, the sipe can be made safely by lamellar plates in a simple manner and yet with sufficient channel size to achieve

Helmholtz effect are implemented.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 11, wherein the hollow body with the axis of its cylindrical shape or

Tube section shape in the circumferential direction U of the tire are aligned. Particularly advantageous for the effective implementation of the noise reduction in the tire is the formation of a vehicle tire according to the features of claim 12, wherein in the profile band each hollow body and its cross-slit sipe each with a minimum distance a with a> 20mm from him nearest lying in the profile band arranged hollow body and its kreuzschlitzförmigem Fine incision are arranged. This can ensure that a sufficiently high number of hollow bodies in

Profile band are effectively formed.

Particularly advantageous is the formation of a vehicle tire according to the features of claim 13, wherein the two intersecting slot portions of the Phillips shape of the sipe in the radially outer surface a cut angle α with 45 ° <a <90 ° - in particular α = 90 ° - include. As a result, the stiffness of the profile strip in the longitudinal and transverse directions of the belt can be adjusted in a simple manner in a simple manner. Particularly advantageous is the formation of a vehicle tire according to the features of claim 14, wherein in the radially outer surface in the position of the intersection of the two intersecting slot portions of the Phillips shape of the sipe a hemispherical or conical recess from the radially outer

Surface in the radial direction R measured depth h ₄ with h ₄ <(hi / 2) - in particular with h ₄ = l, 5mm - is formed. This can additionally a curl between

Fine incision and radially outer surface formed Gummitmaterialkanten or tips are cleverly prevented when braking on dry roads. As a result, the braking properties can be improved on dry roads. The invention will be explained in more detail below with reference to the exemplary embodiments illustrated in FIGS. 1 to 5. Show here

Fig. 1 is a plan view of a peripheral portion of a fiction, designed according to the circumferential rib of a tread pattern of a pneumatic vehicle tire for

Passenger cars, 2 shows the circumferential rib of Fig.l in cross-sectional view according to section II-II of Fig.l,

3 shows the circumferential rib of Fig.l in sectional view according to section III-III of Fig.l, Figure 4 is a plan view of a peripheral portion of a tread pattern for

Pneumatic vehicle tire for passenger cars with a plurality of axially spaced apart A profile bands to illustrate alternative

Embodiments of profile bands and

5 shows a cross-sectional view of a circumferential rib of Figure 4 according to

Sectional view V-V of Figure 4 for explaining a further embodiment.

Figures 1 to 3 show a portion of a tread pattern for

Passenger car (PKW) with a over the entire circumference of the pneumatic vehicle tire in the circumferential direction U aligned circumferential rib 1, which in the axial direction A of the pneumatic vehicle tire to one side by an over the entire circumference of the vehicle pneumatic tire extending circumferential groove 2 and to the other side by a circumferential groove. 3 known type is limited. The circumferential rib 1 is bounded outwardly in the radial direction (R) of the pneumatic vehicle tire by a radially outer surface 4 forming the road contact surface of the circumferential rib 12. The circumferential grooves 2 and 3 are extended in a known manner over the entire circumference of the pneumatic vehicle tire and in the radial direction R is bounded inwardly by a groove bottom and towards the circumferential rib 1, in each case by a groove wall, which forms the flank of the circumferential rib 1 directed towards the respective circumferential groove 2 or 3. The circumferential grooves 2 and 3 are projecting in the radial direction R from the radially outer surface 4 to the groove bottom of the respective circumferential groove 2 and 3 measured maximum tread depth Ρχ formed.

In the circumferential rib 1 are distributed over the circumference of the vehicle pneumatic tire away, arranged one behind the other and each spaced-apart cross-shaped sipes 5 are formed. The cross-slit-shaped sipes 5 are respectively of a first in the radially outer surface 4 rectilinearly extending slot portion 6 and a second in the radially outer surface 4 extending in a straight line

Slot portion 7 is formed, which is to form the cross-shaped slit Fine incision 5, including a cutting angle α with 45 ° <a <90 ° in the radially outer surface 4 cut.

In the illustrated embodiment, a = 90 ° is selected, the first slot portion 6 is aligned in the circumferential direction U of the vehicle pneumatic tire and the second slot portion 7 in the axial direction A.

The first slot section 6 is formed with an extension length C measured in its main extension direction in the radially outer surface 4. The second

Slit portion 7 is formed with a measured in its main extension direction in the radially outer surface 4 extension length B. The first slot section 6 intersects the second slot section 7 centrally. The second slot portion 7 also cuts the first slot portion 6 centrally in the radially outer surface. The first slot section 6 is formed along its entire extension length C in the radial direction R of the pneumatic vehicle tire inwardly with a measured from the radially outer surface 4 depth hi. The first slot section 6 is along its extension length C and in the radial direction R along its

Extension depth hi with a constant incision width di formed with

At the radially inner extension end at a distance hi from the radially outer surface 4 is following in the extension of the first slot portion 6 in the extension thereof

Cylindrically shaped cavity 8 is formed. The cylinder axis extends along the extension of the slot portion 6 parallel to the slot portion 6. The cross-shaped sipe 5 thus connects the cavity 8 with the radially outer surface 4. The cylinder-shaped cavity 8 extends along its cylinder axis over an extension length L which the height indicates the cylinder. The cavity 8 is formed with a along its cylinder axis

Extension length L formed with L <C. In the illustrated embodiment, L = C is selected. The cavity 8 extends in the illustrated embodiment with its entire extension length along the extension of the first slot portion. In the illustrated embodiment, the cavity 8 extends with its extension length over the entire extension length C of the first slot section. 6

The first slot section 6 extends in the radial direction R from the radially outer surface 4, starting over the extension height hi inwardly and opens into the lateral surface of the cylindrical shape of the cavity 8. The section line of the first

Slot portion 6 in the lateral surface of the cylinder is aligned parallel to the axis of the cylinder extends.

The cavity 8 is - as shown in Figure 2 - starting from the first slot portion 6 in the radial direction R inwardly over an extension height h ₃ extends formed. In the sectional planes perpendicular to the axis of the cylindrical shape of the cavity 8 with a measured perpendicular to the radial direction of extension R maximum width D.

educated.

In the illustrated embodiment, the cylindrical shape is formed with a circular base of the cylinder and thus a circular cross-sectional area with the cylinder diameter D and h ₃ with h ₃ = D.

In other embodiments, not shown, the cylinder with a

Base formed, which is oval or elliptical, wherein the larger main extension axis of the ellipse or the oval respectively in the perpendicular to

Cylinder axis formed cross-sectional planes perpendicular to the radial

Extension direction R of the tire is formed. The length of the main axis of extension is D and forms the maximum width D of the cylinder and thus of the cavity. As shown in Figures 1 to 3, the second slot portion 7 along its measured in the radially outer surface 4 extension with the extension length B with formed in the radial direction R, starting from the radially outer surface 4 measured depth I1 ₅ formed with (0.75 hi) <I1 ₅ <hi.

The second slot portion 7 is along its length of extension B and is formed in the radial direction R along its depth of extension I1 ₅ with a constant groove width d _2, where 0.4 mm <d ₂ <l, 4 mm is formed. For the widths di of the first slot portion 6 and d _{2 of} the second slot portion 7, di <d _2.

For the width D of the cavity 8, D> h ₃ . In the illustrated embodiment, the circular cylindrical shape of the cavity 8 D = h _{3 is} formed. In training with elliptical or oval basic shape of the cylinder h ₃ <D is formed.

For the He extension height hi we have hi = (h ₂ - h ₃ ), as well as 3mm <hi _. In this case, h ₂ forms in the radial direction R, starting from the radially outer surface 4 inwardly measured maximum depth of extension of the structure of cruciform sipe 5 and cavity 8. h ₂ is formed with h ₂ <Ρτ, the tread depth P _T with

5mm <Ρχ <8mm is formed.

The width D of the cavity 8 is formed with (2 di) <D <(5 B).

The adjacently formed in the profile band 1 structure from each cavity 8 and this cavity 8 with the radially outer surface 4 connecting cross-shaped sipe 5 are each arranged at a distance a from each other, which is at least 20 mm in size.

The structure of cavity 8 and associated cross-slot-shaped sipe 5 forms in the profile band 1 a Helmholtz resonator.

At least thirty of such are distributed over the circumference of the tire, each having a cavity 8 and a cavity 8 with the radially outer surface 4 connecting cross slot-shaped sipe 5 trained Helmholtz resonators formed.

4 shows a tread pattern of a pneumatic vehicle tire with five peripherally arranged in the axial direction of circumferential ribs 14, 12, 10, 1 and 9, which are each spaced in a known manner in the axial direction A by circumferential grooves 13, 11, 2 and 3 from each other. The two axially outer circumferential ribs 14 and 9 are each formed in a known manner as shoulder circumferential ribs. The circumferential rib 1 is - as shown in Figures 1 to 3 - formed with Helmholtz resonators forming cavities 8 and with these each with the radially outer surface 4 connecting cross-shaped sipes 5.

Figure 4 shows an embodiment of the circumferential rib 1, in which - unlike in Fig.l - also in the axial direction A in the circumferential rib 1 juxtaposed several rows of over the circumference of the tire in the circumferential direction U arranged behind one another, such Helmholtz resonators are formed. In this embodiment as well, the Helmholtz resonators respectively arranged in the circumferential rib 1, each consisting of a cavity 8 and a cross-shaped sipe 5, are each formed at a distance a from each other which is at least 20 mm in size.

FIG. 4 also shows, on the circumferential rib 1, an embodiment of the cross-slot-shaped sipes 5, in which the first slot section 6 and the second slot section 7 enclose a cutting angle α with a <90 ° in the radially outer surface 4. In the example shown, α is formed, for example, with a = 80 °.

In Figure 4 are beyond the example of the circumferential rib 10 such Helmholtz resonators - each consisting of a cavities 8 'and a

cross-slit-shaped sipe 5 '- shown, in which the first slot portion 6' and the cylindrical cavity 8 'in its longitudinal direction, including an inclination angle which is greater than 0 ° and a maximum of 80 ° to the circumferential direction U is aligned. In the illustrated embodiment, this inclination angle is formed at 60 °.

Figure 4 shows the example of the circumferential rib 9 and an embodiment of such Helmholtz resonators - consisting of cylindrical cavities 8 "and

cross-slit-shaped sipes 5 "-, in which the extension length L in the axially juxtaposed and extended over the circumference of the tire rows of circumferentially U successively arranged Helmholtz resonators from row to row of different sizes.

FIGS. 4 and 5 show a further embodiment in which a hemispherical recess 15 is formed in the radially outer surface 4 around the center of the interface of the first slot section 6 "with the second slot section 7" 14 is formed with a depth h ₄ measured in the radial direction R from the radially outer surface 4. H ₄ <(0.5 h ₅ ) and h ₄ <h _{5 are} formed for the depths h ₅ , h ₄ and hi For example, h ₄ is formed with h ₄ = 1.5 mm.

In another, not shown embodiment, the recess 15 is not hemispherical, but conically with a tapered in the radial direction R of the vehicle pneumatic tire inwardly tapered, wherein the cone axis, the sectional axis of the first slot portion 6 "with the second slot portion Ί" forms.

FIG. 4 also shows a further embodiment, in which also in the case of

Fine incisions 5 of the circumferential rib 1 in an analogous manner such recesses 15 are formed. LIST OF REFERENCE NUMBERS

(Part of the description)

1 original rib

2 circumferential groove

3 circumferential groove

4 Radial outer surface

5 cross-shaped sip

6 first slot section

7 second slot section

8 cavity

9 original rib

10 original rib

11 circumferential groove

12 original rib

13 circumferential groove

14 original rib

15 deepening

Claims

claims

1) vehicle pneumatic tires with a profiled barrel strip with by grooves

spaced-apart profile bands - such as tread block rows or tread ribs - which extend over the entire circumference of the pneumatic vehicle tire and are bounded in the radial direction R outwardly by a radially outer surface (4) forming the ground contact surface,

characterized ,

that in at least one profile band (1) spaced from each other and over the

Profile band (1) distributed a plurality of the rubber material of the profile strip (1) enclosed hollow bodies (8) are formed, each of which are each exactly by a cross-shaped sipe (5) with the radially outer surface (4) of the profile strip (1) ,

2) Pneumatic vehicle tire according to the features of claim 1,

wherein the hollow body (8) cylindrical or pipe section shaped with from

Rubber material is formed completely closed end faces, wherein the axis of the cylinder or pipe section shape extending parallel to the extension direction of a first (6) of the two intersecting slot sections

(6,7) of the cross-slit shape of the sipe (5) is formed and

wherein the cross-slot-shaped sipe (5), starting from the lateral surface of the cylindrical or pipe section-shaped hollow body (8) - in particular in the radial direction R - extends outwardly to the radially outer surface (4) of the profile strip (1).

3) Pneumatic vehicle tire according to the features of claim 2,

wherein the cylindrical or the pipe section-shaped hollow body (8) with a formed in its axial direction maximum extension length L and the first slot portion (6) of the Phillips shape of the sipe (5) with a maximum extension length C is formed with L <C.

4) Pneumatic vehicle tire according to the features of claim 1, 2 or 3,

the first (6) of the two intersecting slot sections (6, 7) of the cross-slot shape of the sipe (5) being perpendicular to its one

Extending direction measured gap width di is formed,

the second (7) of the two intersecting slot sections (6, 7) of the cross-slot shape of the sipe (5) being perpendicular to its one

Extension direction measured gap width d ₂ and with a maximum

Extension length B is formed,

wherein the hollow body (8) formed in the axis perpendicular to its axis

Cut planes is formed with a measured in the direction perpendicular to the radial direction of extension of the tire width D with (2 di) <D <(5 B).

5) Pneumatic vehicle tire according to the features of one of claims 2 to 4,

wherein the cylindrical shape or the tubular shape of the hollow body (8) in the

Sectional planes is formed perpendicular to its axis with a circular cross-section of the diameter D or an elliptical or oval cross-section with measured in the larger major axis of the ellipse or the oval diameter D.

6) Pneumatic vehicle tires according to the features of one or more of

previous claims,

wherein the cross-slit-shaped sipe (5) with a measured from the radially outer surface (4) in the radial direction R of the tire inwardly measured to the hollow body (8) measured depth hi with hi <3mm.

7) Pneumatic vehicle tire according to the features of one or more of

previous claims,

wherein the hollow body (8) measured with a radial direction R of the tire Extension height h _{3 is} formed,

wherein the cross-slot-shaped sipe (5) is formed with a measured from the radially outer surface (4) in the radial direction R of the tire inwardly to the hollow body (8) measured depth hi, wherein the hollow body (8) in the radial direction R of the tire is formed inwardly to a position at the maximum distance h ₂ from the radially outer surface (4) extends with hi = (h ₂ - h ₃ ).

8) Pneumatic vehicle tire according to the features of claim 7,

where D> h _{3 is} formed.

9) Pneumatic vehicle tire according to the features of claim 7,

wherein distance h _{2 is formed} with h ₂ <Px, where Ρχ is the maximum in the profile band (1) delimiting the circumferential grooves (2,3) formed tread depth, wherein P _T in particular with 5mm <P _T <8.5 mm is formed.

10) Pneumatic vehicle tire according to the features of claim 4,

wherein the gap widths di and d _{2 are formed} with 0.4 mm <di <1, 2 mm and 0.4 mm <di <1.4 mm,

in particular di <d _{2 is} formed.

11) Pneumatic vehicle tire according to the features of one of claims 2 to 10,

wherein the hollow body (8) with the axis of its cylindrical shape or

Tube section shape in the circumferential direction U of the tire are aligned.

12) pneumatic vehicle tire according to the features of one of the preceding

Claims,

wherein in the profiled strip (1) each hollow body (8) and its cross-slot-shaped sipe (5) in each case at a minimum distance a with a> 20mm of the next him in the profile band (1) arranged hollow body (8) and its cross-slot-shaped sipe (5) are. 13) Pneumatic vehicle tire according to the features of one of the preceding claims,

wherein the two intersecting slot sections (6, 7) of the cross-slot shape of the fine incision (5) in the radially outer surface (4) include an intersection angle α with 45 ° <a <90 ° - in particular α = 90 °.

14) pneumatic vehicle tire according to the features of one of the preceding

Claims,

wherein in the radially outer surface (4) in the position of the intersection of the two intersecting slot portions (6,7, 6 ", 7") of the cross-slot shape of

Fine incision (5, 5 ") has a hemispherical or conical depression (15) of the depth h _4, measured from the radially outer surface (4) in the radial direction R, with h ₄ <(hi / 2) - in particular with h ₄ = l, 5mm - is formed.