DE102019207297A1 - Pneumatic vehicle tires - Google Patents

Abstract

The invention relates to a pneumatic vehicle tire with a tread with at least one shoulder-side and one central tread rib (1, 2), which are separated from one another by a circumferential groove (3) running straight in plan view with two groove flanks (3b, 3c) and a groove base (3a) are separated, wherein in the circumferential groove (3) a plurality of projections (8, 8 ') connected to the groove flanks (3b, 3c) and connected to the groove base (3a) and which follow one another in the circumferential direction are formed Direction compared to the level of the groove bottom (3a) at its highest point a height (h1) of 30% to 70% of the profile depth (T1) and which, viewed in view through the circumferential groove (3), overlap in the axial direction, with between a groove path (10) remains for each projection (8, 8 ') and the groove flank (3b, 3c) opposite this This is achieved in that the projections (8, 8 ') are elongated in the form of a bar in the circumferential direction, with a projection (8) connected to one groove flank (3b) together with an adjoining one in the circumferential direction the other groove flank (3c) connected projection (8 ') forms a pair of projections (8, 8'), wherein the circumferentially successive pairs of projections (8, 8 ') mutual distances (a2) of 20.0 mm to 60 , 0 mm.

Description

The invention relates to a pneumatic vehicle tire with a tread with at least one shoulder-side and one middle tread rib, which are separated from one another by a circumferential groove running to the tread depth, straight in plan view, with two groove flanks and a groove base, wherein in the circumferential groove a plurality of on the groove flanks and is formed on the groove base, successive projections in the circumferential direction, which have a height of 30% to 70% of the profile depth in the radial direction compared to the level of the groove base at their highest point and which, viewed in view through the circumferential groove, overlap in the axial direction, a groove path remaining between each projection and the groove flank opposite it.

Such a pneumatic vehicle tire is for example from DE 10 2014 223 599 A1 known. This has wedge-like projections connected to the groove flanks, which are formed directly one after the other in such a way that a groove path with a width of up to 1.5 mm that runs along and between the projections in a meandering or undulating manner remains on the groove base of the circumferential groove. The wedge-like projections are delimited in the radial direction by inclined cover surfaces which extend to the groove base of the circumferential groove. The projections act in particular as “sound breakers”, that is to say counteract the propagation of sound waves in the circumferential grooves, which reduces the rolling noise.

It is also known that when cornering, the pneumatic vehicle tires on the outside of the curve, in particular the outer shoulders of the treads of these tires, are particularly heavily stressed by the centrifugal force and the frictional forces that occur. These forces are primarily dependent on the respective driving speed and the vehicle weight and, in the event of sudden evasive maneuvers, can have significant effects on the vehicle behavior, in particular on the directional stability. In such driving situations it is particularly important that the tires have good handling properties, which in this context include, in particular, the response to steering forces and the transfer of lateral forces to the roadway.

Particularly in the case of tires that are used on relatively heavy passenger vehicles, such as SUVs, it is important for good handling properties that the tread has shoulder areas that are as solid and stable as possible. Such shoulder areas are characterized by a high degree of rigidity, which, however, makes the deformation of the tread more difficult when rolling on the ground, as a result of which the rolling resistance of the tire is increased. The requirements in terms of rolling resistance and in terms of handling properties are therefore in competition with one another, and there is thus a conflict of objectives between these properties.

The invention is therefore based on the object of resolving the conflicting objectives between the rolling resistance and the handling properties better than before in a tire of the type mentioned at the beginning.

The object is achieved according to the invention in that the projections are elongated in the circumferential direction in the shape of a bar, with a projection connected to one groove flank forming a pair of projections together with a projection connected in the circumferential direction and connected to the other groove flank, the projections following one another in the circumferential direction Pairs of projections have a mutual spacing of 20.0 mm to 60.0 mm.

In driving situations in which good handling properties are important, for example when cornering quickly, the shoulder-side profile rib is deformed in such a way that the groove flanks of the circumferential groove are supported on the projections, which are formed on the respective opposite groove flank, whereby the profile rib on a is stabilized in an advantageous manner for the handling properties. The projections belonging to the same pair, which are located on different groove flanks, can support one another when traction or braking loads act in the circumferential direction, so that with these loads a mutual stabilization of the shoulder-side and the middle profile rib is achieved. During a rolling process taking place under "normal" load, there is a "joint effect", ie a certain mobility of the tread ribs, which means that the tread adapts very well to the road surface and therefore rolls off with little rolling resistance.

According to a preferred embodiment variant, there is a distance of 0.5 mm to 2.0 mm, in particular of at least 1.0 mm, in the circumferential direction between the projections belonging to the same pair, so that a gap remains between the projections. The projections belonging to a pair can therefore advantageously be supported on one another in the event of low traction or braking loads acting in the circumferential direction.

It is also preferred if the projections in the circumferential direction have an extension length of 10.0 mm to 30.0 mm, in particular 15.0 mm to 25.0 mm. Ledges of this Extension length enable effective support of the profile rib, so that it is stabilized in a manner that is particularly advantageous for the handling properties.

For the stabilizing effect of the projections while maintaining the mentioned joint effect, it is preferred if the groove paths compared to the level of the groove bottom in a height determined in the radial direction of up to 75%, in particular up to 50%, particularly preferably from 20% to 40% %, the height of the protrusions.

According to a further preferred embodiment variant, the groove paths - determined at their radially outer end - have a width of 15% to 40%, in particular from 20% to 35%, of the width of the circumferential groove. The width of the groove paths therefore corresponds directly to the width of the projections. This configuration has also proven to be advantageous with regard to the support effect of the projections. At the same time, in the area of the projections, the groove paths also enable good water drainage.

According to a further preferred embodiment variant, the projections have a side face to the respective groove path which, viewed in cross section, extends at an angle of 0 ° to 5 °, in particular up to 2 °, to the radial direction. The groove paths are thus delimited laterally by this side surface and the opposite radially inner section of the groove flank, so that the groove paths have an essentially U-shaped cross section.

The projections are preferably limited in the radial direction by a cover surface running parallel to the tread periphery so that the free edge of the cover surface can contact the respective opposite groove flank and effective support of the projection on the opposite groove flank is supported.

The above-mentioned mutual distances between the pairs of projections following one another in the circumferential direction are preferably 30.0 mm to 50.0 mm.

Particularly preferred is an embodiment in which the pneumatic vehicle tire has a tread asymmetrical with respect to the tire equatorial plane with a defined outer shoulder and a defined inner shoulder, the circumferential groove delimiting a shoulder-side tread rib running at the outer shoulder. As already mentioned at the beginning, the centrifugal force and the frictional forces that occur in this tread area are particularly high when cornering. The formation of the projections in such a circumferential groove is therefore particularly favorable.

According to a further preferred embodiment variant, grooves run in the middle profile rib which open into the circumferential groove in the region of the gap between the projections belonging to the same pair. In particular, the grooves improve the joint effect mentioned.

• 1 eine Draufsicht auf einen Ausschnitt eines Laufstreifens eines Fahrzeugluftreifens mit einer Ausführungsvariante der Erfindung,
• 2 einen Schnitt entlang der Linie II-II der 1,
• 3 eine vergrößerte Ansicht des Details Z der 1,
• 4 einen Schnitt entlang der Linie IV-IV der 3,
• 5 einen Schnitt entlang der Linie V-V der 3 und
• 6 eine Schrägansicht gemäß der in 3 durch einen Pfeil S₆ angedeuteten Sichtrichtung.

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

• 1 a plan view of a section of a tread of a pneumatic vehicle tire with an embodiment of the invention,
• 2 a section along the line II-II of 1 ,
• 3 an enlarged view of the detail Z the 1 ,
• 4th a section along the line IV-IV of 3 ,
• 5 a section along the line VV of 3 and
• 6th an oblique view according to the in 3 by an arrow S ₆ indicated viewing direction.

Pneumatic vehicle tires designed according to the invention are, in particular, tires of radial construction for passenger cars, SUVs, vans or light trucks.

1 shows a plan view of a shoulder-side profile rib 1 and a middle tread rib adjoining this on the inside of the tread 2 , with between the profile rib 1 and the profile rib 2 a shoulder-side circumferential groove running straight in plan view 3 runs. The profile rib 2 is on the inside of the tread by a circumferential groove 4th separated from further profile positives, for example executed in a known manner.

The tread of the pneumatic vehicle tire according to the invention is designed asymmetrically with respect to the tire equatorial plane, not shown, so that the pneumatic vehicle tire has a defined outer shoulder and a defined inner shoulder with respect to the vehicle longitudinal axis, the shoulder-side circumferential groove 3 preferably bounded by a shoulder-side profile rib running at the outer shoulder.

The shoulder-side profile rib 1 is in the shoulder-side circumferential groove 3 opening transverse grooves 5 and within the profile rib 1 ending transverse grooves 6th provided, with two confluent Transverse grooves 5 on two ending transverse grooves 6th and follow the transverse grooves 5 , 6th extend essentially in the axial direction. The middle profile rib 2 is straight or essentially straight narrow grooves that traverse it 7th into block-like rib elements 2a structured, with the grooves 7th in plan view parallel to each other and at an angle to the axial direction α extend from 5 ° to 30 ° and also have a width and a depth of 1.0 mm to 2.5 mm each. Each groove opens at one end 7th at one point in the circumferential groove 3 one, which is essentially centered between a transverse groove 5 and the transverse groove that runs adjacent to it 6th is located.

As 2 shows is the shoulder-level circumferential groove 3 , viewed in cross section, through a groove bottom 3a , to the shoulder-side profile rib 1 by a groove flank on the outside of the tread 3b and to the profile rib 2 by a groove flank on the inside of the tread 3c limited. The groove flank on the outside of the tread 3b runs at an angle to the radial direction β of 5 ° to 17 °, preferably of at least 10 °, the groove flank on the inside of the tread 3c runs, viewed in cross section, at an angle to the radial direction γ from preferably 3 ° to 7 °. The groove flanks 3b , 3c however, they can also run in the radial direction. The circumferential groove 3 is in the respective intended profile depth T ₁ carried out in particular from 6.0 mm to 13.0 mm and has a width in the axial direction B ₁ usually from 6.0 mm to 13.0 mm, in particular up to 10.0 mm, the width B ₁ is determined without taking into account any chamfers and / or curves on the tread periphery.

According to 1 is in the circumferential groove 3 a multiplicity of projections which follow one another in the circumferential direction and are elongated in the form of a bar in the circumferential direction 8th , 8th' trained (see also 6th ). The protrusions 8th are on the outside of the tread groove flank 3b who have favourited Projections 8th' to the groove flank on the inside of the tread 3c tied so that the projections 8th hereinafter also referred to as “outside projections 8th'' and the protrusions 8th' also called “inside protrusions 8th' ‟. Each has an outside protrusion 8th and an inside protrusion 8th' follow one another in pairs, the pairs of projections 8th , 8th' in the circumferential direction a mutual distance a ₂ and the projections belonging to the same pair 8th , 8th' in the circumferential direction a mutual distance a ₁ ( 3 ) from each other and where the distance a ₁ is smaller than the distance a ₂ . As 3 shows, remains, due to the mutual distance a ₁ , between the projections belonging to the same pair 8th , 8th' A gap 9 , where the distance a ₁ 0.5 mm to 2.0 mm, in particular at least 1.0 mm. The mutual distance a ₂ ( 1 ) between pairs of protrusions 8th , 8th' is 20.0 mm to 60.0 mm, in particular 30.0 mm to 50.0 mm.

How in particular 3 also shows the projections belonging to a pair 8th , 8th' such relative to the position of the narrow grooves 7th arranged that each has a groove 7th in the area of the mutually facing ends of the projections belonging to a pair 8th , 8th' into the shoulder-side circumferential groove 3 joins. The outside protrusion 8th is enough with its protrusion on the inside 8th' remote end to the area of the confluence of the closest, confluent transverse groove 5 . The inside protrusion 8th' extends to the end of the closest, ending transverse groove 6th . The protrusions 8th , 8th' each have an extension length determined in the circumferential direction l ₁ from 10.0 mm to 30.0 mm, preferably from 15.0 mm to 25.0 mm, with the extension lengths l ₁ the protrusions 8th , 8th' match in the embodiment shown and in the manner described on the positions of the transverse grooves 5 and 6th are matched. Furthermore, the projections 8th , 8th' compared to the level of the bottom of the groove 3a which is in 4th and 5 is shown in dashed lines, one height in each case in the radial direction h ₁ from 30% to 70%, in particular from 40% to 60%, particularly preferably from 45% to 55%, of the profile depth T ₁ on, with the heights in the embodiment shown h ₁ the protrusions 8th , 8th' to match.

As 4th and 5 also show is both the outside protrusion 8th as well as the inside protrusion 8th' , viewed in cross section, in the radial direction from a top surface 8a , in the circumferential direction of two end faces 8b ( 3 ) and laterally through a side surface 8c limited. The top surface 8a runs parallel to the tread periphery and closes in the illustrated embodiment via a transition rounding 8a ' with a radius of in particular 1.0 mm to 2.0 mm on the groove flank on the outside of the tread 3c (outside protrusion 8th' , 5 ) or to the groove flank on the inside of the tread 3b (inside protrusion 8th , 4th ) at. The end faces 8c run, for example, in the radial direction and, when viewed from above, are inclined in relation to the axial direction ( 1 ). The side face 8c runs, viewed in cross section, at an angle relative to the radial direction δ from 0 ° to 5 °, in particular from up to 2 °.

6th shows a simplified oblique view in the area of a pair of projections 8th , 8th' . As 6th shows remains between the side face 8c every lead 8th , 8th' and that of the respective projection 8th , 8th' opposite groove flank 3b or. 3c one groove path each 10 , where, the groove paths 10 of the projections belonging to the same pair 8th , 8th' over the already mentioned gap 9 , which in plan view is an extension of the respective groove 7th (in 6th not shown, see 3 ) extends, are connected. Every groove path 10 has - determined at its radially outer end, i.e. at the level of the top surface 8a of the projection 8th , 8th' - a width b ₁ ( 4th , 5 ) from 15% to 40%, in particular from 20% to 35%, of the width B ₁ the circumferential groove 3 on. When looking through the circumferential groove 3 "Overlap" the protrusions 8th , 8th' therefore with each other.

In the embodiment shown, the groove paths are 10 and the gap 9 compared to the level of the bottom of the groove 3a are raised in the radial direction and run in relation to this in a height determined in the radial direction h ₂ ( 4th , 5 ) of up to 75%, in particular up to 50%, particularly preferably from 20% to 40% of the height h ₁ ( 4th , 5 ) the protrusions 8th , 8th' .

The invention is not limited to the embodiment variant described. In particular, the design of the shoulder-side profile rib 1 and the middle profile rib 2 differ from the design described.

List of reference symbols

1

shoulder-side profile rib

2

middle profile rib

2a

Rib element

3

shoulder-side circumferential groove

3a

Groove bottom

3b

Groove flank on the outside of the tread

3c

Groove flank on the inside of the tread

4th

Circumferential groove

5

opening transverse groove

6

ending transverse groove

7th

Groove

8, 8 '

head Start

8a

Top surface

8a '

Transitional rounding

8b

Face

8c

Side face

9

gap

10

Grooved Path

a ₁ , a ₂

distance

B ₁

width

b ₁

width

h ₁ , h ₂

height

l ₁

Extension length

S ₆

Arrow (direction of view)

T ₁

Tread depth

Z

detail

α, β, γ, δ

angle

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely 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

• DE 102014223599 A1 [0002]

Claims (10)

Pneumatic vehicle tire with a tread rubber with at least one shoulder side and a central profile rib (1, 2) which each other by a ₍₁ T) running on tread depth, straight running in the plan view of the circumferential groove (3) with two groove flanks (3b, 3c) and a groove bottom ( 3a) are separated, wherein in the circumferential groove (3) a large number of projections (8, 8 '), which are connected to the groove flanks (3b, 3c) and to the groove base (3a) and which follow one another in the circumferential direction and are formed in the radial direction opposite the Level of the groove bottom (3a) at its highest point have a height (h ₁ ) of 30% to 70% of the profile depth (T ₁ ) and which, viewed in view through the circumferential groove (3), overlap in the axial direction, with each Projection (8, 8 ') and the groove flank (3b, 3c) lying opposite it, a groove path (10) remains, characterized in that the projections (8, 8') are elongated in the circumferential direction in the shape of a bar, each s a projection (8) connected to one groove flank (3b) together with a projection (8 ') connected in the circumferential direction and connected to the other groove flank (3c) forms a pair of projections (8, 8'), the in the circumferential direction successive pairs of projections (8, 8 ') have mutual distances (a ₂ ) of 20.0 mm to 60.0 mm. Pneumatic vehicle tires after Claim 1 , characterized in that between the projections (8, 8 ') belonging to the same pair in the circumferential direction there is a distance (a ₁ ) of 0.5 mm to 2.0 mm, in particular of at least 1.0 mm, so that between the Projections (8, 8 ') a gap (9) remains. Pneumatic vehicle tires after Claim 1 or 2 , characterized in that the projections (8, 8 ') in the circumferential direction have an extension length (l ₁ ) of 10.0 mm to 30.0 mm, in particular from 15.0 mm to 25.0 mm. Pneumatic vehicle tires according to one of the Claims 1 to 3 , characterized in that the groove paths (10) compared to the level of the groove bottom (3b) at a height (h ₂ ) determined in the radial direction of up to 75%, in particular of up to 50%, particularly preferred of 20% to 40% , the height (h ₁ ) of the projections (8, 8 '). Pneumatic vehicle tires according to one of the Claims 1 to 4th , characterized in that the groove paths (10) - determined at their radially outer end - have a width (b ₁ ) of 15% to 40%, in particular from 20% to 35%, of the width (B ₁ ) of the circumferential groove (3) exhibit. Pneumatic vehicle tires according to one of the Claims 1 to 5 , characterized in that the projections (8, 8 ') to the respective groove path (10) have a side surface (8c) which, viewed in cross section, to the radial direction at an angle (δ) of 0 ° to 5 °, in particular of up to 2 °. Pneumatic vehicle tires according to one of the Claims 1 to 6th , characterized in that the projections (8, 8 ') are limited in the radial direction by a cover surface (8a) running parallel to the tread periphery. Pneumatic vehicle tires according to one of the Claims 1 to 7th , characterized in that the mutual distances (a ₂ ), which in the circumferential direction have successive pairs of projections (8, 8 '), are 30.0 mm to 50.0 mm. Pneumatic vehicle tires with a tread that is asymmetrical with respect to the tire equatorial plane and has a defined outer shoulder and a defined inner shoulder according to one of the Claims 1 to 8th , characterized in that the circumferential groove (3) delimits a shoulder-side profile rib (1) running at the outer shoulder. Pneumatic vehicle tires according to one of the Claims 1 to 9 , characterized in that grooves (7) run in the middle profile rib (2) which open into the circumferential groove (3) in the region of the gap (9) between the projections (8, 8 ') belonging to the same pair.

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