Commercial-vehicle tyre
Patent Information
- Application Number
- EP2023837170
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-12-19
- Filing Date
- 2023-12-18
- Publication Date
- 2025-10-29
AI Technical Summary
Commercial vehicle tires with circumferential groove combinations and recessed ribs face issues with unsatisfactory wet performance and high rolling resistance, particularly affecting mileage and tread stiffness.
The design incorporates a circumferential groove combination with a narrow groove section and a channel-like widening, ensuring uniform abrasion and improved wet performance by maintaining tread stiffness and water drainage, while the recessed rib promotes regular abrasion and increased mileage.
This design achieves low rolling resistance and excellent wet performance throughout the tire's lifespan, balancing tread stiffness and wet braking properties, thereby enhancing mileage and durability.
Smart Images
Figure 1.1
Abstract
Description
[0001] Description
[0002] Commercial vehicle tires
[0003] The invention relates to a commercial vehicle tire with a profiled tread with profile ribs with an outer surface forming the positive surface and with circumferential grooves running around in the circumferential direction and forming the main grooves of the tread, wherein at least between two profile ribs there runs a circumferential groove combination of two circumferential grooves which are separated from one another by a recessed rib which has an outer surface offset radially inwards by a distance of 1.5 mm to 6.0 mm relative to the outer surface of the tread and a width of 6.00 mm to 14.00 mm at its widest point.
[0004] Commercial vehicle tires designed in this way are known, for example, from DE 3882483 T2. This document discloses commercial vehicle tires with treads featuring various variants of circumferential groove combinations consisting of two circumferential grooves separated from one another by a recessed rib acting as a so-called sacrificial rib and arranged in the tread of the tire instead of a conventional circumferential groove with a V- or U-shaped cross-section. In one of the variants, the two circumferential grooves are designed to match and are mirror images of each other. Their cross-sections are either analogous to conventionally designed circumferential grooves or they are narrow, incised circumferential grooves.In further variants of circumferential groove combinations, one circumferential groove is a narrow, incision-like circumferential groove, and the other, second circumferential groove is a wider circumferential groove in cross-section, similar to conventionally designed grooves. Another commercial vehicle tire of the type mentioned above is known from JP H0288311. The tread of this tire, for example, has at least one circumferential groove combination consisting of a narrow, incision-like circumferential groove and a wider circumferential groove with a V- or U-shaped cross-section. These two circumferential grooves are separated from each other by a rib that is recessed relative to the outer surface of the tread.
[0005] Circumferential groove combinations consisting of two circumferential grooves and a recessed or countersunk rib formed between them have proven particularly advantageous in the treads of commercial vehicle tires, particularly tires used on non-driven vehicle axles, to prevent irregular wear and ensure high mileage. The effect of countersunk ribs is therefore generally known and can be summarized as follows. Since the countersunk ribs, when the tire is new and during an initial phase of tread wear, have an outer surface that is recessed compared to the rest of the tread outer surface, the effective rolling radius of the tire is smaller in the area of these ribs and a constant braking force acts on the countersunk ribs when the tire is rolling freely.As a result, these ribs are subject to greater and more uneven wear than the other dominant profile ribs, which wear much less and, above all, evenly.
[0006] The known circumferential groove combinations either exhibit unsatisfactory wet performance – for example, in combinations of two narrow, slit-like circumferential grooves – or are unsatisfactory in terms of rolling resistance – if one or both circumferential grooves are comparatively wide and designed similarly to conventional circumferential grooves. Wide circumferential grooves result in a high negative component, which adversely affects tread stiffness.
[0007] The invention is based on the object of designing a circumferential groove combination with a recessed rib, which is advantageous for even wear and the associated higher mileage, in a commercial vehicle tire of the type mentioned at the outset, in such a way that the rolling resistance is also kept low and the tire has good wet performance over its possible mileage.
[0008] The stated object is achieved according to the invention in that at least one of the two circumferential grooves of the circumferential groove combination is a circumferential groove which, in the radial direction and in its course along the recessed rib, is composed of a narrow groove section with a particularly constant width of 0.8 mm to 1.5 mm, and a channel-like widening adjoining this groove section and encompassing the groove base with a width determined at its widest point of 4.0 mm to 8.0 mm, in particular of 5.0 mm to 7.0 mm.
[0009] In treads designed according to the invention, the advantages of a circumferential groove combination provided with a recessed rib are combined with the advantages of circumferential grooves that initially have a narrow groove section along the recessed rib and, viewed radially from outside to inside, followed by a widening, i.e., an increased negative volume. In new or slightly worn treads, the recessed rib ensures even wear, improving mileage. The narrow groove section makes the tread particularly stiff, so rolling resistance is also low. The widening along the groove base ensures good wet performance, particularly good wet braking properties.With increasing wear, the narrow groove section “disappears”, the tread becomes stiffer with less rubber volume, and the resulting widening ensures good wet performance even when the tread is worn.
[0010] In a preferred embodiment, the tread has at least one circumferential groove combination, in which one circumferential groove is a circumferential groove with a channel-like widening in the region of the groove base, and the second circumferential groove is a narrow, incision-like circumferential groove with a particularly constant width, which is 0.80 mm to 4.00 mm, in particular up to 2.00 mm. Such circumferential groove combinations are advantageous for increasing the rigidity of the tread and are therefore provided particularly in the shoulder-side regions of the tread.
[0011] In a further advantageous embodiment of the invention, the tread has at least one circumferential groove combination consisting of two circumferential grooves with channel-like widenings in the groove base area, which are particularly designed to match and arranged in a mirror image of each other. Circumferential groove combinations designed in this way primarily ensure a significant improvement in the tire's wet performance.
[0012] The aforementioned effects of the circumferential groove combinations should be largely maintained throughout the tire's service life or the area available for tread wear. In this regard, it is therefore preferred if the circumferential grooves with a channel-like widening and the circumferential grooves with a narrow, notch-like grooves of the respective circumferential groove combinations extend radially to a depth of 6.00 mm to 17.00 mm, in particular 9.00 mm to 15.00 mm, depending on the tire type and dimension.
[0013] For good wet performance of the tire, it is also advantageous if the channel-like widening, starting from its deepest point, has a height which is 35% to 50% of the depth of the circumferential groove having a channel-like widening.
[0014] A further measure advantageous for good wet performance consists in the channel-like widening being designed asymmetrically with respect to a central plane running through the notch-like, narrow groove section of the circumferential groove, wherein its cross-sectional area has two partial areas, wherein the partial area of the channel-like widening further away from the recessed rib is at least 10%, in particular up to 300%, larger than the second partial area. For even abrasion and to avoid cracks in the area of the base of the channel-like widening, it is advantageous if the partial area of the channel-like widening further away from the recessed rib is bulbously rounded outwards at least over a region of the base and a region of the wall formed along the profile rib as a whole, and in particular with a circular arc with a radius of 2.00 mm to 4.00 mm.
[0015] The water drainage and the rigidity of the tread are further advantageously supported if the narrow groove section of the circumferential groove having the channel-like widening has a wall running along the adjacent profile rib, to which wall a rib flank extending to the outer surface of the tread is connected at the level of the outer surface of the recessed rib, which rib flank extends at an angle of 30° to 45° and points away from the recessed rib.
[0016] The main effect of the recessed rib, to ensure regular wear that improves mileage on a new or slightly worn tread, is particularly pronounced when the recessed rib has its greatest width in the area radially outside the widening and when the distance by which the outer surface of the recessed rib is offset radially inward relative to the outer surface of the tread is 2.00 mm to 4.00 mm.
[0017] In a commercial vehicle tire with a tread having two shoulder-side tread ribs and at least two central tread ribs, it is particularly advantageous if at least one of the shoulder-side tread ribs, in particular both, is separated from the adjacent tread rib by a circumferential groove combination consisting of a circumferential groove with a channel-like widening and a narrow, notch-like circumferential groove, wherein the circumferential groove with the channel-like widening borders the shoulder-side tread rib. This measure ensures a good balance between wet performance and tread stiffness on the shoulder side. It is particularly advantageous if the channel-like widening is one that is bulbously rounded outwards at least over a region of the base and a region of the wall formed along the tread rib as a whole and in particular with a circular arc with a radius of 2.00 mm to 4.00 mm.
[0018] In a commercial vehicle tire with a tread provided, as mentioned, with two shoulder-side tread ribs and at least two central tread ribs, it is further advantageous if the central tread ribs are separated from each other by a circumferential groove combination consisting of two circumferential grooves with channel-like extensions, which are particularly designed to match and are arranged in a mirror image of each other. In the central region of the tread, circumferential groove combinations designed in this way are particularly advantageous for achieving a balance between tread stiffness and wet performance.
[0019] In a further preferred embodiment, in at least one circumferential groove combination, the recessed rib is divided into rib sections by transverse grooves, wherein the transverse grooves are formed at mutual spacings of 10.00 mm to 20.00 mm, have a width of 1.00 mm to 2.00 mm, and a depth of 50% to 80% of the depth of the circumferential groove having a channel-like widening. Such transverse grooves in the recessed ribs reduce the rigidity of the recessed ribs and, depending on the position of the circumferential grooves in the tread, can have a beneficial effect on uniform wear.
[0020] Further features, advantages and details of the invention will now be described in more detail with reference to the schematic figures which show exemplary embodiments of the invention.
[0021] Fig. 1, Fig. 2 and Fig. 3 each show an embodiment of a groove combination according to the invention in cross section, Fig. 4a is an oblique view of a circumferential section of a tread of a pneumatic vehicle tire with an embodiment variant of the invention,
[0022] Fig. 4b the tread from Fig. 4a in cross section,
[0023] Fig. 5a and 5b, Fig. 6a and 6b and Fig. 7a and 7b show further variants of the invention in representations analogous to Fig. 4a and Fig. 4b.
[0024] Tires designed according to the invention are commercial vehicle tires for multi-track motor vehicles, in particular commercial vehicle tires of radial design for trucks or buses as well as for steering axles or non-driven axles and in particular for rims with rim diameters of 17.5, 19.5 or 22.5 inches.
[0025] Commercial vehicle tires according to the invention are intended and particularly suitable for operation on long distances, i.e. on motorways, expressways and the like.
[0026] Particularly advantageous embodiments of circumferential groove combinations for treads of the aforementioned commercial vehicle tires are described below with reference to Figures 1 to 3. Circumferential grooves refer to grooves that run either straight or largely straight in the circumferential direction across the tread—for example, with a wave or zigzag shape with deviations of up to 10° from the circumferential direction.
[0027] Fig. 1, Fig. 2, and Fig. 3 show cross-sections of examples of circumferential groove combinations between two tread ribs 5, 5' of a tread on a new tire. In all drawing figures, A denotes the outer surface (positive surface) of the tread ribs 5, 5' of the new tire located outside the circumferential groove combinations.
[0028] The circumferential groove combinations shown in Fig. 1 and Fig. 2 each have a first circumferential groove 1 with a channel-like widening 4 comprising the groove base and a second, narrow, incision-like circumferential groove 2. In the tread of the commercial vehicle tire, the arrangement of these circumferential groove combinations is in particular such that the first circumferential groove 1 adjoins a tread rib 5 located closer to the tire shoulder, and the second adjoins a tread rib 5' located closer to the tread center. Between the two circumferential grooves 1 and 2, a recessed rib 3, a so-called sacrificial rib, runs in the circumferential direction of the tread. This rib has an outer surface 3a running parallel to the outer surface A and is offset radially inward in the radial direction by a distance hR relative to the outer surface A, wherein the distance hR is 1.5 mm to 6.0 mm, in particular 2.0 mm to 4.0 mm.Both the first circumferential groove 1 having the channel-like widening 4 and the second, incision-like narrow circumferential groove 2 extend in the radial direction to a depth T which is 6.0 mm to 17.0 mm, in particular 9.0 mm to 15.0 mm, wherein both circumferential grooves 1, 2 can have the same or different depths T.
[0029] The recessed rib 3 has a width bi on its outer surface 3a, which is 5.0 mm to 13.0 mm, in particular 7.0 mm to 13.0 mm. The two outer edge regions of the recessed rib 3 running in the circumferential direction are preferably chamfered, thus provided with bevels 3b, i.e., narrow inclined surfaces, which are inclined, in particular, at an angle a of 35° to 50° relative to the radial direction.
[0030] The second, incision-like narrow circumferential groove 2 has incision walls 2a, 2'a running in the radial direction and parallel to one another, wherein one incision wall 2a is formed on the recessed rib 3 and the other on the profile rib 5' and extending to the outer surface A and their mutual, in particular constant, distance corresponds to a width b2 which is 0.80 mm to 4.00 mm, in particular up to 2.00 mm.
[0031] In Fig. 1, the channel-like widening 4 in the first circumferential groove 1 is delimited by a base 4c and two opposing walls 4a and 4b, wherein the wall 4a is formed on the adjacent profile rib 5, the wall 4b on the recessed rib 3. The walls 4a, 4b are each composed of two wall sections 4ai, 4a2 and 4bi, 4b2, wherein 4ai and 4bi are each the two wall sections located further radially inward and connect to the base 4c via transition curves (not designated). The base 4c has a width ba, which is determined between the centers of the transition curves to the wall sections 4ai and 4bi and is 2.0 mm to 4.0 mm.
[0032] The radially inner wall sections 4ai and 4bi extend apart in a V-shape and each at an angle ß, ß' of 10° to 30° to the radial direction, wherein the angles ß, ß' can be of equal size, but in particular the angle ß is up to 10°, in particular by at least 5°, greater than the angle ß'. Via further transition curves, the wall sections 4a2 and 4b2 adjoin each other at angles y, y' of 10° to 70° to the radial direction such that they extend relative to each other while reducing the width of the channel-like widening 4. The angles y, y' can be of equal size, in particular the angle y is 5° to 10° greater than the angle y'.
[0033] At angles ß, ß' and y, y' of different sizes, the channel-like widening 4 is designed asymmetrically with respect to a plane e running in the radial direction through the center of the base 4c.
[0034] In the radial direction, the widening 4, starting from its deepest point, has a height Hi which is 35% to 50% of the depth T. The wall sections 4ai and 4bi extend in the radial direction to a height H2 of 60% to 70% of the height Hi. In the area of the transition curves between the wall sections 4ai, 4a2 and 4bi, 4b2, the widening 4 has its greatest width b4, where b4 is 4.0 mm to 8.0 mm, in particular 5.0 mm to 7.0 mm.
[0035] The radially outer wall sections 4a2 and 4b2 are adjoined by walls 1b, 1'b of a groove section 1a, which run parallel to one another and in the radial direction, via transition curves. This groove section 1a, the wall 1b' of which runs along the recessed rib 3 and the wall 1b of which runs along the adjoining profile rib 5, has a particularly constant width bs, which is 0.8 mm to 1.5 mm, in particular up to 1.2 mm. The wall 1b runs in the radial direction, starting from the aforementioned wall section 4a2, up to the level of the outer surface 3a of the recessed rib 3. Adjoining the wall 1b is a rib flank 5a which reaches up to the outer surface A and extends at an angle of δ 30° to 45°, widening the depression present in the tread as a whole due to the recessed rib 3.
[0036] The recessed rib 3 has, in the region of its radial extension between the groove section 1a of the first circumferential groove 1 and the second incision-like narrow circumferential groove 2, a width be which is 6.0 mm to 14.0 mm, in particular 8.0 mm to 12.0 mm.
[0037] In the embodiment of the circumferential groove combination shown in Fig. 2, the second, narrow, incision-like circumferential groove 2 and the recessed rib 3b are designed according to the embodiment described in Fig. 1, as are the groove section 1a of the first circumferential groove 1 and the wall sections 4b1, 4b2, and 4a2 of the widened portion 4. The reference numerals chosen in Fig. 1 have therefore been adopted, and the description has been omitted. The channel-like widened portion 4 is bulbously rounded outwards over at least a region of the base 4c and to the wall section 4a2 as a whole, i.e. continuously. The rounding is preferably circular in shape with a radius Ri of 2.0 mm to 5.0 mm, preferably in the order of 4.0 mm.
[0038] The channel-like widening 4 is thus, relative to a central plane M running through the incision-like narrow groove section 1a e(shown in Fig. 1 and Fig. 2) asymmetrically designed. The cross-sectional area is divided into two partial areas by the center plane Me, wherein the partial area of the channel-like widening 4 further away from the recessed rib 3 is at least 10%, in particular up to 300%, larger than the second partial area. Fig. 3 shows an embodiment of a circumferential groove combination comprising two circumferential grooves 1 separated from one another by a recessed rib 3', which are designed as described for Fig. 1, alternatively as described for Fig. 2. The numbering is adopted accordingly, a description is omitted. The mutual arrangement of the two circumferential grooves 1 is mirror-inverted to one another, so that the recessed rib 3' forms a plane of symmetry s in the center running in the radial direction. e The greatest width be of the rib 3' is, analogous to Fig. 1, 6.0 mm to 14.0 mm, in particular 8.0 mm to 12.0 mm.
[0039] Fig. 4a with Fig. 4b, Fig. 5a with Fig. 5b, Fig. 6a with Fig. 6b and Fig. 7a with Fig. 7b each show circumferential sections and cross sections of a tread 6 with five profile ribs 5, 5' running in the circumferential direction, wherein the profile ribs 5 are the two profile ribs running on the shoulder side and the profile ribs 5' are the three profile ribs running between the shoulder-side profile ribs 5.
[0040] In the embodiment shown in Fig. 4a and Fig. 4b, the shoulder-side tread ribs 5 are separated from their adjacent tread ribs 5' by a circumferential groove combination, as shown in Fig. 2. The circumferential grooves 1 border the shoulder-side tread ribs 5. The two circumferential grooves 7 provided in the central region of the tread 6 are, in particular, conventionally designed circumferential grooves. In addition, the three central tread ribs 5' are structured in a profile block-like manner by narrow grooves or incisions 8 that run in a zigzag pattern when viewed from above.
[0041] Fig. 5a and Fig. 5b show a variant of the tread design shown in Fig. 4a and 4b. The recessed ribs 3 formed in the two circumferential groove combinations running on the shoulder side are divided into rib sections 3c in the circumferential direction by transverse grooves 9 running in the axial direction. The transverse grooves are formed at mutual distances of 10.0 mm to 20.0 mm, have a width of 1.0 mm to 2.0 mm and a depth that is 50% to 80% of the depth T. Fig. 6a and Fig. 6b show an embodiment in which the middle of the three profile ribs 5' is separated from the adjacent profile ribs 5' by circumferential groove combinations according to Fig. 1. The two circumferential grooves 7' running along the shoulder-side profile ribs 5 are, in particular, conventionally designed shoulder-side circumferential grooves with an approximately V- or U-shaped cross-section.
[0042] Fig. 7a and Fig. 7b show an embodiment of a tread 6 in which the middle of the central profile ribs 5' is separated from the adjacent central profile ribs 5' by circumferential groove combinations according to Fig. 3. The circumferential grooves 7' running on the shoulder side correspond to those according to Fig. 6a and 6b.
[0043] List of reference symbols 1 first circumferential groove
[0044] 1a Groove section
[0045] 1b, Tb Wall
[0046] 2 second circumferential groove
[0047] 2a, 2'a incision wall 3, 3' depressed rib
[0048] 3a, 3'a outer surface
[0049] 3b > . Chamfer
[0050] 3c Rib section
[0051] 4 Widening 4a, 4b Wall
[0052] 4ai, 4bi wall section
[0053] 4a2, 4b2 wall section
[0054] 4c > . Reason
[0055] 5, 5' profile rib 5a rib flank
[0056] 6 treads
[0057] 7, 7' circumferential groove
[0058] 8 incision
[0059] 9 Transverse groove a angle (chamfer 3b) ß angle (wall section 4ai) ß' angle (wall section 4bi) Y angle (wall section 4a2) Y' angle (wall section 4b2) ö angle (rib flank 5a)
[0060] A Outer surface (profile ribs 5, 5') bi Width (outer surface rib 3) b2 Width (circumferential groove 2) ba Width (base 4c) b4 Width (widening 4) bs Width (groove section 1a) be Width (rib 3) e > . Level
[0061] Hi height (widening 4)
[0062] H2 Height (wall sections 4ai, 4bi) hR Distance (rib 3 to outer surface A) Me Center plane
[0063] Ri Radius s e plane of symmetry
[0064] T > . Depth
Claims
Patent claims 1 . Commercial vehicle tire with a profiled tread (6) with profile ribs (5, 5') with an outer surface (A) forming the positive surface and with circumferential grooves (1, 2, 7, 7') running in the circumferential direction and forming the main grooves of the tread, wherein at least between two profile ribs (5, 5') there runs a circumferential groove combination (1, 2) consisting of two circumferential grooves which are separated from one another by a recessed rib (3, 3') which has an outer surface (3a, 3'a) offset radially inwardly by a distance (IIR) of 1.5 mm to 6.0 mm relative to the outer surface (A) of the tread (6) and a width (be) of 6.00 mm to 14.00 mm at its widest point, characterized in that at least one of the two circumferential grooves (1) of the circumferential groove combination is a circumferential groove which extends in radial direction and in its course along the recessed rib (3,3') consists of a narrow groove section (1a) with a particularly constant width (bs) of 0.8 mm to 1.5 mm, and a channel-like widening adjoining this groove section and encompassing the groove base, with a width (b4) determined at its widest point of 4.0 mm to 8.0 mm, in particular of 5.0 mm to 7.0 mm.
2. Commercial vehicle tire according to claim 1, characterized in that the tread (6) has at least one circumferential groove combination, in which the one circumferential groove (1) is a circumferential groove having a channel-like widening (4) in the region of the groove base (4c) and the second circumferential groove is a notch-like narrow circumferential groove (2) which has a particularly constant width (b2) which is 0.8 mm to 4.0 mm, in particular up to 2.0 mm.
3. Commercial vehicle tyre according to claim 1 or 2, characterised in that the tread (6) has at least one circumferential groove combination which consists of two channel-like widenings (4) in the region of the groove base. circumferential grooves (1 ), which are in particular designed to match and arranged in a mirror image to one another.
4. Commercial vehicle tyre according to one or more of claims 1 to 3, characterised in that each circumferential groove (1) having a channel-like widening (4) and each incision-like narrow circumferential groove (2) extends in the radial direction to a depth (T) which is 6.0 mm to 17.0 mm, in particular 9.0 mm to 15.0 mm.
5. Commercial vehicle tyre according to one or more of claims 1 to 4, characterised in that the channel-like widening (4), starting from its deepest point, has a height (Hi) which is 35% to 50% of the depth (T) of the circumferential groove (1) having a channel-like widening (4).
6. Commercial vehicle tire according to one or more of claims 1 to 5, characterized in that the channel-like widening (4) is designed asymmetrically with respect to a center plane (Me) running through the incision-like narrow groove section (1a) of the circumferential groove (1) and its cross-sectional area has two partial areas, wherein the partial area of the channel-like widening (4) remote from the recessed rib (3, 3') is at least 10%, in particular up to 300%, larger than the second partial area.
7. Commercial vehicle tire according to claim 6, characterized in that the partial surface of the channel-like widening (4) further away from the recessed rib (3) is bulbously rounded outwards at least over a region of the base (4c) and a region of the wall (4a) formed along the profile rib (5) as a whole and in particular with a circular arc with a radius (Ri) of 2.0 mm to 4.0 mm.
8. Commercial vehicle tyre according to one or more of claims 1 to 7, characterised in that the narrow groove section (1a) of the circumferential groove (1) having the channel-like widening (4) has a groove extending along the adjacent Profile rib (5) extending wall (1b), to which at the level of the outer surface (3a, 3'a) of the recessed rib (3, 3') adjoins a rib flank (5a) extending to the outer surface (A) of the tread (6), which extends at an angle (ö) of 30° to 45° and points away from the recessed rib (3, 3').
9. Commercial vehicle tyre according to one or more of claims 1 to 8, characterised in that the recessed rib (3, 3') has its greatest width (be) in its region radially outside the widening(s) (4).
10. Commercial vehicle tire according to one or more of claims 1 to 9, characterized in that the distance (hp) by which the outer surface (3a, 3'a) of the recessed rib (3, 3') is offset radially inwardly relative to the outer surface (A) of the tread is 2.0 mm to 4.0 mm.
11. Commercial vehicle tire according to one or more of claims 1 to 10, with a tread (6) with two shoulder-side profile ribs (5) and at least two central profile ribs (5'), characterized in that at least one of the shoulder-side profile ribs (5), in particular both, is separated from the adjacent profile rib (5') by a circumferential groove combination consisting of a circumferential groove (1) having a channel-like widening (4) and a notch-like narrow circumferential groove (2), wherein the circumferential groove (1) having the channel-like widening (4) adjoins the shoulder-side profile rib (5).
12. Commercial vehicle tyre according to one or more of claims 6 to 11, characterised in that the channel-like widening (4) is one which is rounded outwards in a bulbous manner at least over a region of the base (4c) and a region of the wall (4a) formed along the profile rib (5) as a whole and in particular with a circular arc with a radius (Ri) of 2.0 mm to 4.0 mm.
13. Commercial vehicle tyre according to one or more of claims 1 to 10 with a tread (6) with two shoulder-side profile ribs (5) and at least two central profile ribs (5'), characterised in that central profile ribs (5') are separated from one another by a circumferential groove combination of two circumferential grooves (1) having channel-like widenings (4), which are in particular designed to match and are arranged in mirror image to one another.
14. Commercial vehicle tire according to one or more of claims 1 to 13, characterized in that in at least one circumferential groove combination, the recessed rib (3, 3') is divided into rib sections (3c) by transverse grooves (9), wherein the transverse grooves (9) are formed at mutual distances of 10.0 mm to 20.0 mm, have a width of 1.0 mm to 2.0 mm and a depth of 50% to 80% of the depth (T) of the circumferential groove (1) having a channel-like widening (4).