vehicle tires

Abstract

The invention relates to a vehicle tire with a tread having at least one row of profile blocks (1) with profile blocks (4), each of which has its own pitch (P L , P M , P M ', P S , P S ') with a pitch length (c PM , c PL , c PS ), wherein each profile block (4) is provided with at least one incision (5, 51, 52, 53, 54, 55, 56), wherein the incisions (5, 51, 52, 53, 54, 55, 56) form a distance (a L , a M , a S , a M ', a S '). Within the profile block row (1) there are profile blocks (4) which are arranged to different pitches (P L , P M , P M ', P S , P S ') matching pitch length (c PM , cPL , c PS ) and for which the distances (a L , a M , a S , a M ', a S ', a M *, a M *') of the incisions (5, 51, 52, 53, 54, 55, 56) - from profile block (1a) to profile block (1a) - differ from one another to the block edges (4') which are oriented the same with respect to the circumferential direction.

Description

The invention relates to a vehicle tire having a tread with at least one profile block row with transverse grooves and profile blocks which are each assigned to a dedicated pitch having a pitch length, each profile block having a respective block edge on each adjacent transverse groove and being provided with at least one sipe or a plurality of sipes, the sipes being narrower than the transverse grooves, having a width of 0.2 mm to 3.0 mm, a maximum depth of 10% to 100% of the profile depth and having a spacing determined in the circumferential direction with respect to the block edges oriented identically with respect to their geometric center of gravity.Such vehicle tires are known, for example, from DE 10 2017 203 221 A1 or DE 10 2015 224 291 A1.To reduce the rolling noise of a pneumatic vehicle tire, it is customary to assign different circumferential lengths (so-called pitch lengths) to the identical profile sections, so-called pitches, which follow one another over their circumference in the tread strip. Pitches with two to five different pitch lengths are usually provided in tread strips. A specific succession of these pitches over the circumference in a so-called pitch sequence generates a broad frequency spectrum and optimizes the rolling noise.The invention is based on the object of further reducing the rolling noise in a vehicle tyre of the type mentioned at the beginning.The object set is achieved according to the invention in that within the row of profiled blocks are provided profiled blocks which belong to different pitches of matching pitch length and in which the distances of the cuts-from profiled block to profiled block-to the block edges oriented identically with respect to the circumferential direction differ from one another.The cuts are thus assigned individual positions in profile blocks which belong to different pitches of matching pitch length. This prevents or substantially prevents the occurrence of positive interference in the rolling noise, so that the rolling noise is further reduced.According to a preferred embodiment, profile blocks are provided within the profile block row, which correspond to different pitches of corresponding pitch length closest to one another in the circumferential direction and in which the distances of the cuts to the block edges oriented identically with respect to the circumferential direction deviate from one another. This contributes to a particularly efficient reduction of positive noise interferences.A further preferred embodiment provides that within the profile block row, in each case for all profile blocks which belong to different pitches of matching pitch length, the distances of the incisions to the block edges oriented identically with respect to the circumferential direction differ from one another. The basic inventive concept in this embodiment is therefore extended to all profile blocks of the profile block row, which likewise results in a further reduction in the rolling noise.According to a further preferred embodiment, the distances which the cuts have to each block edge of the associated profile block are at least 2.0 mm, in particular at least 3.0 mm.It is advantageous if within the profile block row profile blocks are provided which belong to different pitches of matching pitch length and are each provided with a plurality of incisions, wherein adjacent incisions within a profile block in each case have distances from one another which are related to the geometric centroids and are projected in the circumferential direction, wherein these distances between the profile blocks differ from one another in pitches of matching pitch length. The basic concept of the invention is extended by this embodiment to the relative position of the cuts within the profile blocks. The frequency spectrum occurring during rolling is thus correspondingly widened and the rolling noise is further reduced.According to a further preferred embodiment, pitches with at least two different pitch lengths are provided.According to an advantageous variant of the last-mentioned preferred embodiment, it is advantageous if a profile block with an adjacent transverse groove is assigned to its own pitch, the transverse groove having a width whose size is directly proportional to the pitch length of the associated pitch. The widths of the transverse grooves are thus included in the pitch, whereby the rolling noise is additionally reduced.A further preferred embodiment is characterized in that the transverse grooves have a width of 1.0 mm to 10.0 mm, in particular of 2.0 mm to 5.0 mm, and preferably of at least 2.5 mm and / or a maximum depth of 50% to 100%, in particular of at least 70%, of the profile depth.Furthermore, according to a further preferred embodiment, it is provided that the width of the cuts is 0.4 mm to 2.0 mm, preferably up to 1.6 mm, and / or the maximum depth of the cuts is 30% to 95%, in particular at least 50%, of the profile depth.According to a further preferred embodiment, the distances which the incisions have to block edges oriented identically with respect to the circumferential direction in the case of profile blocks belonging to different pitches of matching pitch length differ from one another by at least 0.5 mm, in particular by at least 1.5 mm, particularly preferably by at least 3.0 mm. This measure also contributes to a further reduction of the rolling noise.A further preferred embodiment consists in that the tread has at least one further profile block row with transverse grooves and profile blocks which are each assigned to a dedicated pitch having a pitch length, wherein each profile block of the further profile block row has a respective block edge on each adjacent transverse groove and is provided with at least one sipe or a plurality of sipes, wherein the sipes are narrower than the transverse grooves, a width of 0.2 mm to 3.0 mm, a maximum depth of 10% to 100% of the profile depth and, with respect to the block edges oriented identically with respect to the circumferential direction, have a spacing determined in the circumferential direction with respect to their geometric centroids, wherein profile blocks are provided within the further profile block row, the pitches of the cuts-from profile block to profile block-to the block edges oriented identically with respect to the circumferential direction differ from one another. The concept according to the invention is thus applied to a further profile block row.In the last-mentioned preferred embodiment, an advantageous further development consists in the fact that the further profile block row differs from the at least one profile block row with regard to a) the pitch lengths and / or b) the position of the pitches on the tire circumference and / or c) the sequence of pitches and / or d) the distances of the sipes to the block edges.Further features, advantages and details of the invention will now be explained in more detail with reference to the drawing which schematically shows exemplary embodiments of the invention. Figure shows FIG. 1 is a top view of a tread block row of a tread of a vehicle tire with a first embodiment variant of the invention, FIG. 2 is a top view of a tread block for explaining a second embodiment of the invention, FIG. 3 is a top view of a tread block for explaining a third embodiment of the invention, FIG. 4 is a top view of a tread block for explaining a fourth embodiment of the invention, FIG. 5 is a top view of a tread block for explaining a fifth embodiment of the invention, FIG. 6 is a top view of a tread block for explaining a sixth embodiment of the invention; and FIG. 7 is a plan view of a tread block for explaining a seventh embodiment of the invention.Vehicle tires designed according to the invention are tires for motor vehicles, in particular for multi-lane motor vehicles, preferably for passenger cars (passenger cars), vans (transporters) or SUVs, and preferably pneumatic vehicle tires, particularly preferably pneumatic vehicle tires of radial design.FIG. 1 shows a plan view of a section of a circumferentially encircling central profile block row 1 of a tread of a pneumatic vehicle tire. The circumferential direction is indicated by a double arrow U.The middle row of profibr blocks 1 is laterally delimited by circumferential grooves 2 which are merely indicated in FIG. 1 and is structured by transverse grooves 3 which open into the circumferential grooves 2 into profile blocks 4 which follow one another in the circumferential direction. The transverse grooves 3, viewed in plan view, extend parallel to one another and to the axial direction at an angle α of preferably 0° to 50°, in particular of 10° to 45°, and each have a groove center line m QR following the course of the groove in plan view.The tread is noise-optimized according to a method of pitch length variation, so that the middle profile block row 1 has pitches following one another in the circumferential direction, in particular is composed of such pitches, pitches P S, P S' each having a smallest pitch length c PS, pitches P M, P M' each having a pitch length c PM determined in the circumferential direction and a pitch P L having a largest pitch length c PL determined in the circumferential direction being provided or are provided in the circumferential section of the profile block row 1 shown in the exemplary embodiment. The middle profile block row 1 is preferably composed of 50 to 100, in particular of up to 80, preferably of up to 60, pitches following one another in the circumferential direction. The ratio of the three pitch lengths c PL: c PM: c PS is, for example, 1.4:1.2:1.In the exemplary embodiment shown, each pitch P S, P S', P M, P M', P L comprises a profile block 4 together with the one transverse groove 3 adjoining in the circumferential direction U. Alternatively, each pitch P S, P S', P M, P M', P L comprises only one profile block 4, so that the transverse groove 3 is not subject to the pitch.The profile blocks 4 have maximum block lengths cs (profile block 4 in pitch P S, P S'), c M( profile block 4 in pitch P M, P M'), c L( profile block 4 in pitch P L) correlating with the pitch lengths c PS, c PM, c PL i.e. directly proportional to these. The maximum block length cs, c M, c L is the length at the longest position in the circumferential direction. The transverse grooves 3 have widths B QR of 1.0 mm to 10.0 mm, in particular of 2.0 mm to 5.0 mm, preferably of at least 2.5 mm, which correlate with the pitch lengths c PS, c PM, c PL and determined on the tread periphery and in plan view perpendicular to the groove center lines m QR and a maximum depth (depth at the deepest point) of 50% to 100%, in particular of at least 70%, of the profile depth. Thus, the maximum block length c M of a profile block 4 located at pitch P M, P M' is greater than the maximum block length cs of a profile block 4 located at pitch P S, P S' and less than the maximum block length c L of a profile block 4 located at pitch P L The same applies to the widths B QR of the transverse grooves 3.Each profiled block 4 has a block edge 4' on one adjoining transverse groove 3 and a block edge 4'' on the other adjoining transverse groove 3, wherein the block edges 4' delimit the profiled blocks 4 in the one circumferential direction which is directed upward in FIG. 1 and the block edges 4'' delimit the profiled blocks 4 in the other, opposite circumferential direction which is directed downward in FIG. 1. Each transverse groove 3 is therefore formed with a block edge 4' and a block edge 4". The boundaries between the pitches Ps, P S', P M, P M', P L run along one of the block edges 4'.Each profile block 4 is provided with an incision 5 which opens into the circumferential grooves 2 on both sides, therefore traverses the profile block 4, runs straight in plan view and parallel to the block edges 4', 4", has a width of 0.2 mm to 3.0 mm, in particular of 0.4 mm to 2.0 mm, preferably of up to 1.6 mm, and has in the radial direction a maximum depth (depth at the deepest point) of 10% to 100%, in particular of 30% to 95%, preferably of at least 50%, of the profile depth and an incision center line m E which follows in plan view centrally of the incision course and is situated on the tread periphery. The width of each sipe 5 is smaller than the width B QR of each lateral groove 3. Since each sipe 5 is straight as mentioned above in plan view, the sipe base line b E coincides with the sipe center line m E.The sipes 5 in the profile blocks 4 of the pitches P M, P S, P L each have, with respect to the block edge 4' belonging to the respective profile block 4, - in relation to the sipe base line b E- a distance a M( sipe 5 in the pitch P M), as (sipe 5 in the pitch Ps), a L( sipe 5 in the pitch P L) determined on the tread periphery in the circumferential direction, the distance a M, as, a L in each case 50% of the associated block length cM, c S, c L. Since the block lengths c M, cs, c L, differ from one another in the pitches P M, P S, P L as already mentioned, the distances a M, as, a L also differ from one another.The sipe 5 in the profile block 4 of the pitch P M' has a distance a M' of 33% of the associated maximum block length c M determined on the tread periphery in the circumferential direction with respect to the block edge 4'-in relation to the sipe base line b E-.The sipe 5 in the profile block 4 of the pitch P S' has a spacing a S' of 66% of the associated maximum block length cs, which spacing is determined on the tread periphery in the circumferential direction, with respect to the block edge 4'-in relation to the sipe base line b E-.FIGS. 2 to 7 show, by way of example, a plan view of a profile block 4 in a pitch P M, the representations being enlarged compared to FIG. 1. As will be explained below, the profile blocks 4 shown in FIGS. 2 to 7 are provided with a cut 5 1 to 5 6 instead of the cut 5. Analogously to the exemplary embodiment of FIG. 1, profile blocks 4 are provided in each case in different pitches of matching pitch length, the spacings of the incisions 5 1 to 5 6 differing accordingly.The profiled block 4 shown in FIG. 2 is provided with a cut-out 5 1 which, viewed in plan view, extends horizontally and in an elongated Z-shape and into the circumferential grooves 2 (see below. FIG. 1 ) opens. The incision 5 1 has, as viewed in plan view, an elongated incision center line m E running in a Z-shape and a straight incision base line b E connecting the ends of the incision center line m E and having a geometric centre of gravity S corresponding to the centre of the incision base line b E. The incision 5 1 has--based on the geometric center of gravity S--a distance a M of 50% of the block length c M determined on the tread periphery in the circumferential direction from the block edge 4'.The profile block 4 shown in FIG. 3 is provided with an incision 5 2 which, viewed in plan view, extends in the form of a zigzag wave, ends closed on both sides within the profile block 4, an incision center line m E, an incision base line b E having a geometric center of gravity S corresponding to the center of the incision base line b E and--with respect to the geometric center of gravity S--has a spacing a M of 50% of the block length c M determined on the tread periphery in the circumferential direction relative to the block edge 4'.The profile block 4 shown in FIG. 4 is provided with a cut-out 5 3 which, viewed in plan view, extends in the form of an elongated S-shaft, on both sides into the circumferential grooves 2 (compare. FIG. 1 ) merges, an incision center line m E, an incision base line b E with a geometric center of gravity S corresponding to the center of the incision base line b E and--in relation to the geometric center of gravity S--to the block edge 4' has a spacing a M of 50% of the block length c M determined on the tread periphery in the circumferential direction.The profiled block 4 shown in FIG. 5 is provided with two notches 5 4 which terminate closed on one side inside the profiled block 4 and which, viewed in plan view, run straight, the one notch 5 4 into the one circumferential groove 2 (compare. FIG. 1 ) and the other incision 5 4 into the other one circumferential groove 2 (compare. FIG. 1 ) opens. The right-hand sipe 5 4 in FIG. 5 has--based on the geometric center of gravity S of the sipe base line b E( coincides with the sipe center line m E )--a distance a M* of 30% of the maximum block length c M determined on the tread periphery in the circumferential direction with respect to the block edge 4'. The left-hand sipe 5 4 in FIG. 5 has--based on the geometric center of gravity S of the sipe base line b E- with respect to the block edge 4'--a distance a M** of 70% of the block length c M determined on the tread periphery in the circumferential direction. Furthermore, the two incisions 5 are at a distance a determined in the circumferential direction from one another--in relation to the centroids S of the incision base lines b E-.The profile block 4 shown in FIG. 6 is provided with an incision 5 5 which, viewed in plan view, extends in the form of a closed curve free of any creases, in particular in the form of an oval line of an elongate oval. The incision 5 5 has a geometric center of gravity S (center of gravity) with respect to the surface enclosed by the incision center line m E. The incision 5 5 also has--based on the geometric center of gravity S--a distance a M of 50% of the block length c M determined on the tread periphery in the circumferential direction from the block edge 4'.The profile block 4 shown in FIG. 7 is provided with an incision 5 6 which, viewed in plan view, extends in the form of a closed curve having bends, in the exemplary embodiment in the form of a hexagon. The sipe 5 6 has, with respect to the surface enclosed by the sipe center line m E a geometric center of gravity S (center of gravity) and, with respect to the geometric center of gravity S, a distance a M of 50% of the block length c M determined in the circumferential direction on the tread periphery.The invention is not limited to the described exemplary embodiments.In the case of incisions with two free incision ends, the described distances of the incisions to the block edges relate to the geometric center of gravity of the incision base line, which, in plan view, runs straight and between the ends of the incision center line following the incision course in the middle. The geometric center of gravity of the incision base line corresponds to the center of the incision base line. The cuts with two free cut ends can, as viewed in plan view, for example extend continuously curved and / or in sections in a wave-shaped manner.In the case of incisions running around in the form of closed curves, described distances of the incisions to the block edges relate to the geometric center of gravity (center of gravity) of the surface enclosed by the incision center line. Such cuts extend in particular in the form of an oval line, preferably a circular line or an elliptical line, or in the form of a convex polygon.The transverse grooves can terminate on one side within the profile block row in the manner of a blind groove, so that the profile blocks are contiguous in sections and the profile block row is therefore designed in the manner of a rib.Several profile block rows with appropriately designed notches can be provided.Preferably, profile blocks are provided within the or each profile block row, which belong to different pitches of matching pitch lengths, wherein the distances of the cuts-from profile block to profile block-to the block edges oriented identically with respect to the circumferential direction deviate from one another in particular by at least 0.5 mm, preferably by at least 1.5 mm, particularly preferably by at least 3.0 mm.List of reference characters1 middle profile block row 2 circumferential groove 3 transverse groove 4 profile block 4', 4"block edge 5, 5 1, 52, 53, 54, 55, 56 sipe a distance a L, a M, a S distance a M', a S' distance a M*, a M*' distance b E sipe base line B QR width cM, cL, c S maximum block length c PM, c PL, c PS pitch length m E sipe center line m QR groove center line P L, P M, P M', P S, PS' pitch S geometric center of gravity U double arrow (circumferential direction) α angleReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2017 203 221 A1

[0002] DE 10 2015 224 291 A1

[0002]

Claims

Vehicle tyre having a tread with at least one profile block row (1) with transverse grooves (3) and profile blocks (4) which are each assigned to a dedicated pitch (P L, P M, P M', P S, P S') with a pitch length (c PM, c PL, c PS) wherein each profile block (4) has a respective block edge (4', 4") on each adjacent transverse groove (3) and with at least one sipe (5, 5 1, 52, 53, 54, 55, 5_ner14_) or a plurality of cuts (5, 5 1, 52, 53, 54, 55, 56) wherein the cuts (5, 5 1, 52, 53, 54, 55, 56) are narrower than the transverse grooves (3), a width of 0.2 mm to 3.0 mm, a maximum depth of 10% to 100% of the profile depth and, with respect to the block edges (4') oriented identically with respect to the circumferential direction, a spacing (a L, a M, as, a M', determined in the circumferential direction and related to their geometric center of gravity (S), a S') characterised in that within the profile block row (1) profile blocks (4) are provided which belong to different pitches (P L, P M, P M', Ps, P S') of matching pitch length (c PM, c PL, c PS) and in which the distances (a L, a M, aS, aM', aS', aM*, aM*') of the incisions (5, 5 1, 52, 53, 54, 55, 56) - of profile block (1a) to profile block (1a) differ from one another--with respect to the block edges (4') oriented identically with respect to the circumferential direction.Vehicle tyre according to Claim 1, characterized in that within the row of profile blocks (1) there are provided profile blocks (4) which belong to different pitches (P M, P M', P S, P S') of matching pitch length (c PM, c PS) which are closest to one another in the circumferential direction and in which the spacings (a M, a M', a S, a S') of the sipes (5, 51, 52, 53, 54, 55, 5_ner66_) differ from one another with respect to the block edges ( 4') oriented identically with respect to the circumferential direction.Vehicle tyre according to Claim 1 or 2, characterized in that, within the row of profile blocks (1), in each case for all the profile blocks (4) which belong to different pitches (P M, P M', P S, P S') of matching pitch length (c PM, c PS) the spacings (a M, a M', a S, a S') of the sipes (5) to the block edges (4') oriented identically with respect to the circumferential direction differ from one another.Vehicle tyre according to one of Claims 1 to 3, characterized in that the distances (a L, a M, a S, a M', a S'), which the sipes (5) have to each block edge (4', 4") of the associated profile block (4), are at least 2.0 mm, in particular at least 3.0 mm.Vehicle tyre according to one of Claims 1 to 4, characterized in that profile blocks (4) are provided within the profile block row (1), which profile blocks belong to different pitches (P M, P M') of matching pitch length (c PM) and are each provided with a plurality of sipes (5 4) wherein, in each case within a profile block (4), adjacent sipes (5 4) have spacings (a) from one another which relate to the geometric centroids (S) and are projected in the circumferential direction, wherein these spacings (a) between the profile blocks (4) have pitches (P M, P M') of matching pitch length (c PM) can be distinguished from one another.Vehicle tyre according to one of Claims 1 to 5, characterized in that pitches (P L, P M, P M', P S, P S') with at least two different pitch lengths (c PM, c PL, c PS) are provided.Vehicle tyre according to Claim 6, characterized in that a profile block (4) each having an adjoining transverse groove (3) is assigned its own pitch (P L, P M, P M', P S, P S') in each case, the transverse groove (3) having a width (b QR) whose size is directly proportional to the pitch length (c PM, c PL, c PS) of the associated pitch (P L, PM, PM', PS, P is S').Vehicle tyre according to one of Claims 1 to 7, characterized in that the transverse grooves (3) have a width (B QR) of 1.0 mm to 10.0 mm, in particular of 2.0 mm to 5.0 mm, and preferably of at least 2.5 mm and / or a maximum depth of 50% to 100%, in particular of at least 70%, of the profile depth.Vehicle tyre according to one of Claims 1 to 8, characterized in that the width of the sipes (5, 5 is 1, 52, 53, 54, 55, 56) 0,4 mm to 2.0 mm, preferably up to 1.6 mm, and / or the maximum depth of the sipes (5, 5 is 1, 52, 53, 54, 55, 56) 30% to 95%, in particular at least 50%, of the profile depth.Vehicle tyre according to one of Claims 1 to 9, characterized in that the spacings (a L, a M, a S, a M', a S', a M*, a M*'), which the sipes (5, 5 1, 52, 53, 54, 55, 56) with respect to block edges (4') oriented identically with respect to the circumferential direction, in the case of pitches (P L, P M, PM', P6, P S') of matching pitch length (c PM, c PL, c PS) have profile blocks ( 4) belonging to them which deviate from one another by at least 0.5 mm, in particular by at least 1.5 mm, particularly preferably by at least 3.0 mm.Vehicle tyre according to one of Claims 1 to 10, characterized in that the tread has at least one further profile block row having transverse grooves and profile blocks which are each assigned to its own pitch having a pitch length, each profile block of the further profile block row having a respective block edge on each adjacent transverse groove and being provided with at least one sipe or a plurality of sipes, the sipes being narrower than the transverse grooves, a width of 0.2 mm to 3.0 mm, a maximum depth of 10% to 100% of the profile depth and having a spacing determined in the circumferential direction with respect to the block edges which are oriented identically with respect to the circumferential direction, profile blocks being provided within the further profile block row, the pitches of the cuts-from profile block to profile block-to the block edges oriented identically with respect to the circumferential direction differ from one another.Vehicle tyre according to Claim 11, characterized in that the further profile block row differs from the at least one profile block row (1) with regard to a) the pitch lengths and / or b) the position of the pitches on the tyre circumference and / or c) the sequence of pitches and / or d) the spacings of the sipes from the block edges.

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