COMMERCIAL VEHICLE TIRES

Description

[0001] The invention relates to a commercial vehicle tire with a tread having at least one central row of profile blocks bounded on each side by a circumferential groove, the profile blocks being separated from one another by transverse grooves with a width of 4.0 mm to 8.0 mm opening into the circumferential grooves and each having a block edge extending in a zigzag pattern in plan view on the circumferential grooves, wherein the block edge is composed of straight edge sections enclosing each other at an angle of 120° to 170°, which are end edge sections and at least one further edge section extending between them, and having a bend on the inside of the block or a bend on the outside of the block at the mutual connection of the edge sections, wherein the profile blocks have incisions with a width of 0.4 mm to 1 mm that open into the circumferential grooves and run parallel to each other and between bends of the block edges.are 8 mm and have a maximum depth of 70% to 100%.

[0002] Such a commercial vehicle tire is known, for example, from US 2013 / 0180638 A1. In one embodiment, the commercial vehicle tire has a tread with a central circumferential groove that runs in a zigzag pattern in plan view in the area of ​​the tire's equatorial plane, and with two shoulder-side circumferential grooves that also run in a zigzag pattern in plan view. The circumferential grooves define two central rows of tread blocks, which are structured into tread blocks with a relatively large circumferential extent by transverse grooves that open into the circumferential grooves. The tread blocks have zigzag block edges with four edge segments in plan view along the circumferential grooves, with both the cuts and the transverse grooves running between the inward folds of the block edges. This commercial vehicle tire is intended to have good traction properties and uniform wear characteristics.

[0003] It is well known that for the traction and winter driving characteristics of a commercial vehicle tire, it is advantageous if the central tread blocks between the lateral grooves contain several, preferably long, slits. In tread blocks with zigzag-shaped edges, these slits are usually of unequal length. The shorter slits, in particular, tend to develop cracks at their base, likely due to the increased stress at the base of these shorter slits. Consequently, the tire's durability is compromised.

[0004] The invention is therefore based on the objective of being able to arrange several cuts between the transverse grooves of a commercial vehicle tire of the type mentioned at the outset in such a way as to ensure good traction properties and good winter driving characteristics, whereby the cuts should not tend to cause cracks at the base of the cut in order to improve the durability of the tire.

[0005] The problem stated in the invention is solved by the fact that the two block edges are each composed of a total of five or seven edge sections, wherein the edge sections of the block edges run parallel to each other in each profile block, wherein the end edge sections run at matching first angles of 2° to 15° to the circumferential direction and each further edge section runs at an angle larger than the first angle to the circumferential direction, and wherein the cuts run between an inside bend of one block edge and an outside bend of the other block edge, as well as between all bends.

[0006] The tread blocks feature specially designed zigzag-shaped block edges. Due to their specific arrangement between the zigzag edges, the at least four slits per tread block have equal lengths, resulting in comparably good crack resistance at their base and thus improving the tire's durability. Simultaneously, the zigzag-shaped block edges, combined with the increased number of slits per tread block, ensure good traction and winter driving characteristics.

[0007] According to a preferred embodiment, each profile block has a circumferential offset between its edge and the edge of the other block. The cuts therefore run at a corresponding angle to the axial direction, which further improves the traction properties, particularly when lateral forces are present.

[0008] Furthermore, it is preferred that the end edge sections of the block edges belonging to circumferentially successive profile blocks are aligned when viewed from above. This ensures a balanced stiffness in the areas of the profile blocks adjacent to the transverse grooves, which is advantageous for uniform wear.

[0009] Another preferred embodiment is characterized in that the internal kinks of the block edges, viewed from above, each lie on a first, circumferentially extending auxiliary line, and the external kinks of the block edges lie on a second, circumferentially extending auxiliary line parallel to the first auxiliary line. This contributes to a reduction of the stress load in the area of ​​the cut bases.

[0010] Preferably, the angle at which the additional edge sections adjoining the end edge sections run to the circumferential direction is 20° to 30°, particularly 23° to 27°. Such additional edge sections improve the traction properties in the circumferential direction.

[0011] The two following preferred embodiments, which can be combined with each other, relate to the relative lengths of the edge sections of the block edge and ensure that the profile block segments formed by the cuts have essentially the same circumferential lengths, which contributes to a more uniform profile stiffness and thus further improves the durability of the tire.

[0012] According to a first advantageous embodiment in this respect, the end edge sections each have a circumferentially projected length of 12% to 22%, in particular 14% to 18%, of the circumferentially projected length of the block edge.

[0013] According to a second advantageous embodiment in this respect, the further edge sections adjoining the end edge sections each have a circumferentially projected length of 17% to 25%, in particular 19% to 23%, of the circumferentially projected length of the block edge.

[0014] Another preferred embodiment is characterized in that the circumferentially projected length of the block edge is 40.0 mm to 70.0 mm, or that the block edge has a circumferentially projected length of 40.0 mm to 70.0 mm.

[0015] According to a further preferred embodiment, the profile blocks each have an outer block surface located at the periphery of the tread, block flanks at the adjacent transverse grooves, and rounded transition surfaces extending between the block flanks and the outer block surface. Viewed in a cross-section oriented perpendicular to the center line of the transverse groove, these transition surfaces connect tangentially to the block flank and tangentially to the outer block surface. The transition surfaces are particularly advantageous for braking performance.

[0016] Preferably, the first angles at which the end edge sections run to the circumferential direction are 5° to 10°, in particular 6° to 9°.

[0017] Another preferred embodiment is characterized in that the tread has at least two, in particular at least three, preferably exactly three, adjacent central rows of profile blocks, wherein the profile blocks from immediately adjacent central rows of profile blocks – with reference to auxiliary lines running axially through the centers of the outer surfaces of the profile blocks – have a circumferential offset of 20% to 50%, in particular 25% to 45%, preferably at least 40%, of an arithmetically averaged length calculated from the circumferentially projected lengths of the four block edges belonging to the respective profile blocks. This contributes to a further improvement in traction properties.

[0018] A first advantageous embodiment of the aforementioned preferred design is characterized in that, in profile blocks which have an offset relative to each other, the block edges have axially opposite circumferential sections which run along the circumferential section of the groove separating the profile blocks from each other, wherein in the region of the circumferential section of each block edge, the outer bend(s) of the block have a circumferential offset of 0.5 mm to 5.0 mm relative to the nearest inner bend of the other block edge, determined in the circumferential direction, wherein the offset is smaller than the circumferentially projected lengths of the edge sections of the block edges. This also contributes to a further improvement in the traction properties.

[0019] A second advantageous embodiment of the aforementioned preferred design is characterized in that the profile blocks from adjacent central profile block rows are oriented rotated by 180° when viewed from above. This also contributes to an improvement in traction characteristics.

[0020] Another preferred embodiment is characterized in that at least one semi-central profile block row belongs to the central profile block rows, which is adjacent to a shoulder-side profile rib, wherein the shoulder-side profile rib has a rib edge extending in a zigzag pattern in plan view at the adjacent circumferential groove, with edge sections enclosing angles of 130° to 140°, wherein at the rib-outer bending point located at the mutual junction of two edge sections, a notch with a width of 0.4 mm to 1.8 mm and a maximum depth of 70% to 100% of the profile depth opens into the circumferential groove. Such a combination is particularly advantageous with regard to traction properties.

[0021] Another preferred embodiment is characterized in that the rib edge has circumferential sections which are axially opposite each block edge of a semi-central profile block of the semi-central profile block row, wherein in the area of ​​each circumferential section of the rib edge the block-outer bending points of the block edge to the circumferentially nearest, rib-inner bending point of the rib edge has a circumferentially determined offset of 0.5 mm to 5.0 mm, wherein the offset is smaller than the circumferentially projected lengths (of the edge sections of the block edges).

[0022] Further features, advantages, and details of the invention will now be described in more detail with reference to the drawing, which schematically depicts an embodiment of the invention. The drawing shows Fig. 1 a top view of a tread of a commercial vehicle tire with an embodiment of the invention and Fig. 2 An enlarged top view in the area of ​​a profile block.

[0023] Commercial vehicle tires designed according to the invention are in particular tires for buses or trucks (lorries) and preferably radial tires for rims with a rim diameter of 17.5, 19.5 or 22.5 inches.

[0024] Fig. 1 Figure 1 shows a top view of a tread of a commercial vehicle tire. The tread has a central row of tread blocks 1, two semi-central rows of tread blocks 2, and two shoulder-side tread ribs 3. The central row of tread blocks 1 is separated from each semi-central row of tread blocks 2 by a central circumferential groove 4, and the semi-central rows of tread blocks 2 are separated from the adjacent shoulder-side tread rib 3 by a shoulder-side circumferential groove 5.

[0025] The circumferential grooves 4, 5 are designed in a radial direction to the respective intended profile depth, which in particular is 12.0 mm to 26.0 mm, and each has a groove base 4a (circumferential grooves 4), 5a (circumferential grooves 5).

[0026] The central profile block row 1 and each semi-central profile block row 2 are structured by a number of circumferentially successive transverse grooves 6, which open into the respective adjacent circumferential grooves 4, 5, forming central profile blocks 7 (central profile block row 1) or semi-central profile blocks 8 (semi-central profile block rows 2). Viewed from above and with respect to groove centerlines m QR oriented in the direction of extension, the transverse grooves 6 run straight, parallel to each other within each profile block row 1, 2, and at an angle α of 0° to 20°, in particular 5° to 15°, with the transverse grooves 6 of the semi-central profile block rows 2 being oriented oppositely to the transverse grooves 6 of the central profile block row 1 with respect to the axial direction.The transverse grooves 6 have a maximum radial depth (depth at the deepest point) of 75% to 100%, in particular up to 95%, of the profile depth and a width b QR of 4.0 mm to 8.0 mm, measured in plan view perpendicular to the groove centerline m QR. The transverse grooves 6 of the semi-central profile block rows 2 are offset circumferentially from the transverse grooves 6 of the central profile block row 1. Furthermore, the transverse grooves 6 of one semi-central profile block row 2 are offset circumferentially from the transverse grooves 6 of the other semi-central profile block row 2.

[0027] The further design of the middle profile blocks 7 and the semi-central profile blocks 8 is explained below using individual profile blocks 7, 8 as examples.

[0028] The profile block 7, 8 has an outer block surface 9 located at the periphery of the tread, a block flank 10 at each adjacent transverse groove 6, two rounded transition surfaces 11 adjoining each of the block flanks 10, and a block edge 12 located at the periphery of each axially adjacent circumferential groove 4 or 5. The central profile block 7 has a block flank 13 adjoining the respective block edge 12 of each central circumferential groove 4. The semi-central profile block 8 has a block flank 13 adjoining the corresponding block edge 12 of the adjacent central circumferential groove 4 and a block flank 14 adjoining the respective block edge 12 of the adjacent shoulder-side circumferential groove 5.

[0029] The rounded transition surfaces 11 run between the respective block flank 10 and the block outer surface 9 and, viewed in plan view perpendicular to the groove centerline m QR, connect tangentially to the block flank 10 and tangentially to the block outer surface 9. The block flanks 10, viewed in the latter cross-section, run straight and at an angle of 0° to 5° to the radial direction. When determining the aforementioned width b QR of the transverse grooves 6, the transition surfaces 11 are disregarded, so the width b QR is determined as if the block flanks 10, viewed in the latter cross-section, continued straight to the tread periphery.

[0030] As will be explained in more detail later, the profile block 7, 8 is traversed by incisions 15 that open into the respective adjacent circumferential grooves 4, 5, interrupting the block edges 12 section by section. In the following explanations of the block edges 12, the incisions 15 are disregarded, so that the design of the block edges 12 is explained as if they were not interrupted by the incisions 15 and thus continued beyond them.

[0031] Each block edge 12 terminates at the transition surfaces 11 and, viewed from above, runs in an irregular zigzag pattern, with one block edge 12 running parallel to the other block edge 12 and – if the angle α of the transverse grooves 6 deviates from 0° – offset from it in the circumferential direction. Therefore, viewed from above, one block edge 12 can be mapped onto the other block edge 12 by parallel translation, with the block edges 12 being offset in the circumferential direction by an offset a K ( Fig. 2 ) relative to each other. The magnitude of the offset a K results from the previously mentioned angle α ( Fig. 1 ) the transverse grooves 6.

[0032] According to Fig. 2 Each block edge 12 has a circumferentially projected length cK of 40.0 mm to 70.0 mm. Viewed from above, the block edge 12 comprises two straight and parallel end edge sections 12a, two straight and parallel edge sections 12b following edge sections 12a, and a straight middle edge section 12c running between edge sections 12b. The immediately successive edge sections 12a, 12b, and 12c enclose angles β with each other, which may differ from one another and are each between 120° and 170°, in particular between 130° and 160°. The block edge 12 has a bend 12d on the inside of the block and a bend 12e on the outside of the block at the mutual connection points of the edge sections 12a, 12b, and 12c.At the block-inside fold points 12d, the angle β runs over the side of the respective circumferential groove 4, 5 and at the block-outside fold points 12e, the angle β runs over the block-outside surface 9.

[0033] The end edge sections 12a each have a circumferentially projected length ca of 12% to 22%, in particular 14% to 18%, of the length c K of the block edge 12 and, viewed from above, extend at an angle γ of 2° to 15°, in particular 5° to 10°, preferably 6° to 9°, to the circumferential direction. The edge sections 12b each have a circumferentially projected length cb of 17% to 25%, in particular 19% to 23%, of the length c K of the block edge 12 and, viewed from above, extend at an angle δ of 20° to 30°, in particular 23° to 27°, to the circumferential direction opposite to the end edge sections 12a. The middle edge segment 12c has a length cc projected in the circumferential direction and, viewed from above, runs straight and at an angle ε to the circumferential direction. The magnitude of the length cc is determined by the magnitudes of the lengths ca , cb .The size of the angle ε is determined from the lengths ca , cb , cc and the angles β, γ, δ.

[0034] In the embodiment, the angles β, γ, δ, ε and the lengths ca , cb , cc are coordinated such that the block-inside kinks 12d, viewed in plan view, lie on a straight, circumferentially extending, block-inside auxiliary line hi and the block-outside kinks 12e, viewed in plan view, lie on a straight, circumferentially extending, block-outside auxiliary line ha.

[0035] The block flank 14 comprises flank sections 16 adjoining one another in the circumferential direction, each extending from an edge section 12a, 12b, 12c, which, viewed in a top view perpendicular to the corresponding edge section 12a, 12b, 12c, run at a constant angle of 10° to 20°, in particular 12° to 18°, to the radial direction. A transition radius 17 is formed between the radially inner end of each flank section 16 of the block flank 14 and the groove base 5a.

[0036] The block flank 13 differs from the block flank 14 in that, in addition to flank sections 16, it has a triangular, radially inner flank section 18 with a triangular base facing the groove base 4a, which is formed between those flank sections 15 that originate from the edge sections 12b, 12c adjoining each other at the bend point 12d on the inside of the block.

[0037] According to Fig. 1 The profile block 7, 8 is provided with the aforementioned incisions 15, which have a width of 0.4 mm to 1.8 mm, in particular up to 1.2 mm, and a maximum depth (depth at the deepest point) determined in the radial direction of 70% to 100% of the profile depth. The incisions 15 traversing the profile block 7, 8 run parallel to each other, in particular straight lines, when viewed from above and with respect to incision center lines m E oriented in the direction of extension, and – as Fig. 2 The diagram shows the area between the internal fold 12d of one block edge 12 and the external fold 12e of the other block edge 12, which has an offset a K relative to this internal fold 12d. The number of incisions 15 corresponds to the number of folds 12d, 12e of each block edge 12.

[0038] How Fig. 1 Furthermore, the design of the profile blocks 7, 8 within the respective profile block rows 1, 2 is such that the end edge sections 12a of the block edges 12, which belong to circumferentially successive profile blocks 7 or 8, are aligned with each other when viewed from above, i.e., in a straight line extending from each other. In addition, the semi-central profile blocks 8 are oriented rotated by 180° relative to the central profile blocks 7 when viewed from above. Furthermore, the semi-central profile blocks 8 are also offset relative to each other circumferentially, corresponding to the previously mentioned offset between the transverse grooves 6.The semi-central profile blocks 8 have a circumferential offset a B of 20% to 50%, in particular 25% to 45%, preferably at least 40%, of that arithmetically averaged length which is determined from the lengths c K (. Fig. 2 ) of the four block edges 12 of the respective profile blocks 7, 8 is calculated. The midpoint M is the intersection of two straight lines in plan view, which run between the ends of the different block edges 12 of the respective profile block 7, 8 that are oriented oppositely to each other with respect to the circumferential direction.

[0039] Preferably, the aforementioned offset a B is aligned with the execution of the block edges 12 as explained below. According to Fig. 2 The block edges 12 of profile blocks 7, 8, which have the offset a B ( Fig. 1 The profile blocks 7, 8 have axially opposing circumferential sections 12u, which run along the circumferential section of the respective central circumferential groove 4 that separates them. In the area of ​​the circumferential section 12u of each block edge 12, the outer bend(s) 12e of the block exhibit a circumferential offset a 1 of 0.5 mm to 5.0 mm relative to the nearest inner bend 12d of the other block edge 12, where the offset a 1 is smaller than the smallest of the lengths ca , cb , cc .

[0040] How Fig. 1 As shown, the shoulder-side profile ribs 3 each have an outer rib surface 3a located at the periphery of the tread, and on the adjacent shoulder-side circumferential groove 5, a rib edge 3b located at the periphery of the tread and a rib flank 3c adjoining this. Viewed from above, the rib edge 3b has a zigzag shape, is composed of straight edge sections 3b', each forming an angle η of 130° to 140° with each other, and has creases 3d on the outer side of the rib and creases 3e on the inner side of the rib. The shoulder-side profile ribs 3 are each provided with incisions 19 with a width of 0.4 mm to 1.8 mm, in particular up to 1.2 mm, and a maximum depth (depth at the deepest point) determined in the radial direction of 70% to 100% of the profile depth, wherein the incisions 19 each open into the respective shoulder-side circumferential groove 5 at a rib-outer bend 3d.The number of incisions 19 corresponds to the number of rib-outer kinks 3d.

[0041] According to Fig. 2 The rib edge 3b has circumferential sections 3bu, each extending along a circumferential section of the shoulder-side circumferential groove 5 that separates a semi-central profile block 8 from the shoulder-side profile rib 3 and lies axially opposite the corresponding block edge 12. In the area of ​​the circumferential section 3bu, the block-outer folds 12e of the block edge 12 exhibit a circumferential offset a 2 of 0.5 mm to 5.0 mm relative to the nearest circumferentially located, rib-inside fold 3e of the rib edge 3b, where the offset a 2 is smaller than the smallest of the lengths ca , cb , cc .

[0042] The circumferential grooves 4, 5 have a maximum width B UR determined in the axial direction at the tread periphery ( Fig. 1, width at the widest points) from 10.0 mm to 25.0 mm, in particular from at least 15.0 mm.

[0043] The invention is not limited to the described embodiment.

[0044] The tread has at least one central row of tread blocks positioned arbitrarily. The central row of tread blocks can therefore be a central row running in the area of ​​the tire's equatorial plane, or a central or semi-central row of tread blocks running laterally to the tire's equatorial plane. The shoulder-side tread ribs can be designed in a manner known per se. The rounded transition surfaces 11 are optional, allowing the block flanks 10 to connect to the outer block surface 9 and thus extend to the tread periphery. Reference symbol list

[0045] 1 Central profile block row 2 Semi-central profile block row 3 Shoulder-side profile rib 3a Rib outer surface 3b Rib edge 3b U Circumferential section 3b' Edge section 3c Rib flank 3 Rib outer bend 3 Rib inner bend 4 Central circumferential groove 4a Groove base 5 Shoulder-side circumferential groove 5a Groove base 6 Transverse groove 7 Central profile block 8 Semi-central profile block 9 Block outer surface 10 Block flank 11 Transition surface 12 Block edge 12a End edge section 12b Edge section 12c Central edge section 12d Block inner bend 12e Block outer bend 12 U Circumferential section 13 Block flank 14 Block flank 15 Cut 16 Flank section 17 Transition rounding 18 Radially inner Flank section 19 Cut a 1 , a 2 , a B , a K Offset b QR Width B UR Maximum width ca , cb , cc , c K Length ha Block outer guideline hb Guideline hi Block inner guideline M Center m E Cut centerline m QR Groove centerline α, β, γ, δ, ε, η Angle

Claims

1. Commercial vehicle tyre with a tread strip with at least one central row of tread blocks (1, 2) with tread blocks (7, 8), which are delimited on each side by a circumferential groove (4, 5) and which are separated from each other by transverse grooves (6) opening into the circumferential grooves (4, 5) with a width (bQR) from 4.0 mm to 8.0 mm, and each have, on the circumferential grooves (4, 5), an edge (12) running in a zigzag in plan view, wherein the block edge (12) comprises edge portions (12a, 12b, 12c) which run in a straight line, each encloses an angle (β) of 120° to 170°, and are end-side edge portions (12a) and at least one further edge portion (12b, 12c) which runs between them, and the said block edge has, at the mutual connection of the edge portions (12b, 12c), a kink (12d) on the block inner side or a kink (12e) on the block outer side, wherein the profile blocks (7, 8) are provided with sipes (15) which open into the circumferential grooves (4, 5), run parallel to each other and between kinks (12d, 12e) of the block edges (12), and have a width of 0.4 mm to 1.8 mm and a maximum depth of 70% to 100%, characterized in that the block edges (12) each comprise five or seven edge portions (12a, 12b, 12c), wherein the edge portions (12a, 12b, 12c) of the block edges (12) run parallel to one another in each profile block (7, 8), wherein the end-side edge portions (12a) run, in relation to the circumferential direction, at corresponding first angles (γ) of 2° to 15°, and each further edge portion (12b, 12c) runs, in relation to the circumferential direction, at an angle (δ, ε) greater than the first angle (γ), and wherein the sipes (15) each run between a kink (12d) on the block inner side of the one block edge (12) and a kink (12e) on the block outer side of the other block edge (12) and also between all kinks (12e, 12d).

2. Commercial vehicle tyre according to Claim 1, characterized in that, in the case of each profile block (7, 8), the one block edge (12) has an offset (aK) determined in the circumferential direction with respect to the other block edge (12).

3. Commercial vehicle tyre according to Claim 1 or 2, characterized in that the end-side edge portions (12a) of the block edges (12) which belong to consecutive profile blocks (7, 8) in the circumferential direction are aligned with each other, as viewed in plan view.

4. Commercial vehicle tyre according to one of Claims 1 to 3, characterized in that the kinks (12d) on the block inner side of the block edges (12) each lie, as viewed in plan view, on a first auxiliary line (hi) running in the circumferential direction, and the kinks (12e) on the block outer side of the block edges (12) lie on a second auxiliary line (ha) running in the circumferential direction and parallel to the first auxiliary line (hi).

5. Commercial vehicle tyre according to one of Claims 1 to 4, characterized in that the angle (δ), at which the further edge portions (12b), which adjoin the end-side edge portions (12a), run with respect to the circumferential direction, is 20° to 30°, in particular from 23° to 27°.

6. Commercial vehicle tyre according to one of Claims 1 to 5, characterized in that the end-side edge portions (12a) each have a length (ca), projected in the circumferential direction, of from 12% to 22%, in particular from 14% to 18%, of the length (cK) of the block edge (12).

7. Commercial vehicle tyre according to one of Claims 1 to 6, characterized in that the further edge portions (12b), which adjoin the end-side edge portions (12a), each have a length (cb), projected in the circumferential direction, from 17% to 25%, in particular from 19% to 23%, of the length (cK), projected in the circumferential direction, of the block edge (12).

8. Commercial vehicle tyre according to one of Claims 1 to 7, characterized in that the length (cK), projected in the circumferential direction, of the block edge (12) is from 40.0 mm to 70.0 mm, and / or in that the block edge (12) has a length (cK), projected in the circumferential direction, from 40.0 mm to 70.0 mm.

9. Commercial vehicle tyre according to one of Claims 1 to 8, characterized in that the profile blocks (7, 8) each have a block outer surface (9) lying in the tread strip periphery, block flanks (10) on the adjacent transverse grooves (6), and rounded transition surfaces (11) running between the block flanks (10) and the block outer surface (9), which as viewed in plan view perpendicularly with respect to the groove centre line (mQR) of the transverse groove (6), adjoin the block flank (10) tangentially and the block outer surface (9) tangentially.

10. Commercial vehicle tyre according to one of Claims 1 to 9, characterized in that the first angles (γ), at which the end-side edge sections (12a) run with respect to the circumferential direction, are 5° to 10°, in particular 6° to 9°.

11. Commercial vehicle tyre according to one of Claims 1 to 10, characterized in that the tread strip has at least two, in particular at least three, preferably exactly three, adjacent middle profile block rows (1, 2), wherein the profile blocks (7, 8) comprising directly adjacent middle profile block rows (1, 2) have - in relation to auxiliary lines (hB) running in the axial direction through the centre points (M) of the outer block surfaces (9) of the profile blocks (7, 8) - an offset (aB) determined in the circumferential direction of 20% to 50%, in particular of 25% to 45%, preferably of at least 40%, of an arithmetically averaged length which is calculated from the lengths (cK), projected in the circumferential direction, of the four block edges (12) belonging to the respective profile blocks (7, 8).

12. Commercial vehicle tyre according to Claim 11, characterized in that, in the case of profile blocks (7, 8), which have the offset (aB) with respect to each other, the block edges (12) have axially opposite circumferential portions (12u) which run along the circumferential portion of the circumferential groove (4) separating the profile blocks (7, 8), wherein, in the region of the circumferential portion (12u) of each block edge (12), the kink / kinks (12e) on the block outer side has or have an offset (a1), determined in the circumferential direction, of 0.5 mm to 5.0 mm with respect to the nearest (in the circumferential direction) kink (12d) on the block inner side of the respective other block edge (12), wherein the offset (a1) is smaller than the lengths (ca, cb, cc), projected in the circumferential direction, of the edge portions (12a, 12b, 12c) of the block edges (12).

13. Commercial vehicle tyre according to Claim 11 or 12, characterized in that the profile blocks (7, 8) from adjacent middle profile block rows (1, 2) are oriented rotated by 180°, as viewed in plan view.

14. Commercial vehicle tyre according to one of Claims 1 to 13, characterized in that at least one semi-central profile block row (2) belongs to the middle profile block rows (1, 2), which semi-central block row is adjacent to a shoulder-side profile rib (3), wherein the shoulder-side profile rib (3) has, at the adjacent circumferential groove (5), edge portions (3b') enclosing a rib edge (3b), which runs in plan view in a zigzag-shaped manner, at an angle (η) of 130° to 140°, wherein in each case one sipe (20) with a width of 0.4 mm to 1.8 mm and a maximum depth of 70% to 100% of the profile depth opens into the circumferential groove (5) at the kink (3d) on the rib outer side present at the mutual connection of two edge portions (3b').

15. Commercial vehicle tyre according to Claim 14, characterized in that the rib edge (3b) has circumferential portions (3u) which each lie axially opposite a block edge (12) of a semi-central profile block (8) of the semi-central profile block row (2), wherein, in the region of each circumferential portion (3bU) of the rib edge (3b), the kinks (12e) on the block outer side of the block edge (12) have an offset (a2) of 0.5 mm to 5.0 mm with respect to the rib-inside kink (3e) on the rib inner side of the rib edge (3b) which is nearest in the circumferential direction, wherein the offset (a2) is smaller than the lengths (ca, cb, cc), projected in the circumferential direction, of the edge portions (12a, 12b, 12c) of the block edges (12).