Vehicle pneumatic tire

Abstract

The invention relates to a vehicle pneumatic tire having a tread with blocks (1, 1') which in each case have a block outer surface (4) and at least one sipe (7) which in plan view extends at an angle of 0° to 50° to the axial direction, spans the respective block (1, 1'), divides into block sections (1a), and has a width (b E1 ) of 0.4 mm to 1.2 mm, a maximum depth (t E1 ) of 70% to 100% of the pattern depth, two sipe walls (9), and a sipe center region (F1) spaced apart according to the sipe walls (9), wherein the spanning sipe (7) is produced to the maximum depth (t E1 ) at least in a sipe region which extends over a portion of the sipe (7) in plan view and has a protrusion (7b) which is at a distance from the block outer surface (4) and is formed between a radially outer delimitation line (L a ) which extends through a radially outermost point of the protrusion (7b) at a constant first depth determined in the radial direction relative to the sipe center region (F1) and a radially inner delimitation line (L i ) which extends through a radially innermost point of the protrusion (7b) at a constant second depth determined in the radial direction relative to the sipe center region (F1) as seen in the corresponding cross section perpendicular to the sipe center region (F1). In each case, at least one additional sipe (8, 8') is formed in the block section (1a) of the blocks (1, 1'), which is elongated in plan view and has a width (b E2 ) of 0.3 mm to 1.0 mm and a maximum depth (t E2 ), said additional sipe (8, 8') encloses a complementary angle (a) with the spanning sipe (7) which deviates from 90° up to 60°, and which has a sipe end portion (8a, 8'a) in the region radially outside the protrusion (7b) of the spanning sipe (7), wherein the point of the maximum depth (t E2 ) of the additional sipe (8, 8') lies radially inside the level of the radially outer delimitation line (L a ) of the protrusion (7b).

Description

Technical Field

[0001] This invention relates to a pneumatic tire for a vehicle, the pneumatic tire having a tread having tread blocks, each of the tread blocks having an outer surface and at least one sipe, the at least one sipe extending at an angle of 0° to 50° with respect to the axial direction in a top view, spanning the respective tread block, dividing into block segments, and having: a width of 0.4 mm to 1.2 mm, a maximum depth of 70% to 100% of the tread depth, two sipe wall sections, and sipe center regions spaced apart by the sipe wall sections, wherein the spanning sipe pattern, at least in the top view, is... A portion of the groove pattern extends to the maximum depth in the groove pattern region and has a protrusion that is a certain distance from the outer surface of the block and is formed between a radial outer boundary line and a radial inner boundary line, as seen in a corresponding section perpendicular to the center region of the groove pattern. The radial outer boundary line extends through the outermost point of the protrusion at a constant first depth determined in the radial direction relative to the center region of the groove pattern, and the radial inner boundary line extends through the innermost point of the protrusion at a constant second depth determined in the radial direction relative to the center region of the groove pattern. Background Technology

[0002] For example, this type of vehicle pneumatic tire is known from WO 2019 048 092A1. The vehicle pneumatic tire has a directional tread with tread blocks, each of which is provided with at least two sipes. These at least two sipes extend at an angle of 0° to 45° with respect to the axial direction in a top view, have a width of 0.4 mm to 1.0 mm, and a maximum depth of 70% to 100% of the tread depth. When viewed in cross-section, each sipe has a central portion forming a protrusion that extends in an arc and faces away from the leading edge region of the block. The protrusions of the two sipes have different maximum deflections, and the maximum deflection of the protrusion of the sipe closest to the leading edge region of the block is greater than that of the protrusion of the sipe closest to the trailing edge region of the block. These sipes cause a favorable tilting behavior of the tread blocks, which maintains a high net contact surface, thereby improving grip characteristics and allowing for uniform wear of the tread blocks.

[0003] The sipes formed in the tread blocks are crucial for grip characteristics, especially in winter driving conditions and on wet roads. Improvements in grip are achieved primarily through longer grip edges, which provide the sipes. For good grip, it is desirable to have a large number of sipes in the tread blocks. However, it is essential to ensure that the tread blocks do not become "too soft," otherwise, due to the significant tilting motion of the tread blocks, the corresponding grip edges will "roll in" under braking loads, reducing the effectiveness of the grip edges.

[0004] To counteract this effect, it is known to provide sipes with protrusions within the sipe pattern. These protrusions restrict the degrees of freedom of movement of the tread block segments formed by the sipes, which is particularly advantageous for tread blocks with multiple sipes, as commonly found in the treads of winter tires. This restricted freedom of movement results in less severe deformation of the tread block segments under load, allowing the sipes and block edges to better function as grip edges, and thus, in particular, improving snow grip characteristics. Summary of the Invention

[0005] The purpose of this invention is to further improve the grip characteristics of vehicle pneumatic tires of the type mentioned in the introduction, while maintaining good driving characteristics on dry roads.

[0006] According to the present invention, the set objective is achieved by the following: in various cases, at least one additional grooving pattern is formed in the block segment of these pattern blocks, the at least one additional grooving pattern being elongated in top view and having a width of 0.3 mm to 1.0 mm and a maximum depth, the additional grooving pattern forming complementary angles with the spanning grooving pattern, these complementary angles deviating from 90° to 60°, and the at least one additional grooving pattern having a grooving pattern end portion in the radially outer region of the protrusion of the spanning grooving pattern, wherein the point of maximum depth of the additional grooving pattern is located radially inner at the level of the radially outer boundary line of the protrusion.

[0007] The additional serrations provide additional grip edges, which improve grip characteristics on wet and snowy roads. The specific orientation of these additional grip edges towards the cross-cutting serrations produces several beneficial effects. The grip edges provided by the additional serrations have a significantly different orientation from the serration edges of the cross-cutting serrations, resulting in a multi-directional grip structure on the outer surface of the block, which significantly improves grip characteristics. Furthermore, the additional serrations "divide" the block segments into small "segment regions," resulting in particularly good adhesion of the block segments to ice-covered roads, producing a favorable large net contact surface on ice and therefore good ice grip characteristics. In addition, the additional serrations also absorb meltwater formed when driving on ice. Because the effect of the additional serrations on block stiffness is generally almost negligible and very uniform (primarily due to their orientation, and secondly due to the protrusions present in the cross-cutting serrations), the particularly advantageous tilting behavior of the treaded block is maintained, which is particularly beneficial for force transmission, especially on dry roads. Therefore, the measures taken can improve grip characteristics on icy and snowy roads as well as on wet roads, while maintaining good driving characteristics on dry roads.

[0008] According to a preferred embodiment, the point of maximum depth of the additional grooving pattern is located radially outside the radial outer boundary line of the protrusion. This additional grooving pattern has almost no impact on block stiffness, which helps maintain good driving characteristics on dry roads.

[0009] Preferably, the maximum depth of the additional groove pattern is 1.5 mm to 3.0 mm. This additional groove pattern can advantageously absorb melt water, and in particular, maintain high block stiffness at the same time, thus providing a favorable compromise in this respect.

[0010] Another preferred embodiment is characterized in that the radial outer defining line is at a distance of 1.0 mm to 2.9 mm, particularly at least 1.2 mm, from the outer surface of the block in the radial direction. The protrusion formed at this defined distance from the outer surface of the block is advantageous for the effect of the protrusion, and therefore advantageous for the effect of the groove pattern and the block edge as a gripping edge.

[0011] According to another preferred embodiment, the protrusion has a plane of symmetry extending to a constant depth defined in the radial direction, wherein the point of maximum depth of the additional sipes is located radially outside the plane of symmetry, and wherein the constant depth at which the plane of symmetry extends is preferably 0.5 mm to 1.5 mm greater than the maximum depth of the additional sipes. Therefore, the additional sipes terminate halfway radially outside the protrusion. This also helps maintain high block stiffness and is particularly advantageous for treads made of soft rubber materials. Such a tread has proven entirely advantageous, i.e., in winter tires.

[0012] According to another preferred embodiment, the additional groove pattern extends linearly in the top view. This allows for a particularly uniform effect on the stiffness of the patterned block segment.

[0013] Another preferred embodiment provides that the additional sipes extend into the cross-cutting sipes or terminate in front of the cross-cutting sipes at a distance of 0.1 mm to 0.3 mm from the cross-cutting sipes, as determined in the extension of the sipe centerline in a top view. The open additional sipes are advantageous for drainage of the tread blocks because meltwater forms from the additional sipes into the corresponding cross-cutting sipes. The termination of the additional sipes reduces stiffness to a lesser extent and is particularly advantageous for treads made of soft rubber materials.

[0014] Preferably, the groove pattern has a radially outer portion that extends in the radial direction between the protrusion and the outer surface of the block and has a length of 1.0 mm to 2.0 mm in the radial direction relative to the central region of the groove pattern.

[0015] Another advantageous embodiment features tread blocks, each tread block segment having at least one additional sipe, which is elongated in top view, wherein, in particular, at least 30% of all tread blocks are designed in this manner. Such tread blocks provide particularly uniform water drainage and uniform "softening." The large number of additional sipes means providing a significant amount of additional grip edges.

[0016] The softening and drainage behavior of the patterned blocks is also particularly uniform in the following cases: patterned blocks are provided that are adjacent to grooves extending at an angle of 0° to 60° in the coaxial direction, wherein these additional groove patterns extend parallel to and in particular at a distance corresponding to the grooves in the top view.

[0017] According to another preferred embodiment, additional cutting groove patterns are provided, in which the complementary angles deviate from 90° to 45°, preferably to 30°, and particularly preferably to 10°.

[0018] Preferably, additional cutting groove patterns are provided, in which the complementary angle is 90°.

[0019] Preferably, patterned blocks are provided, each having at least two block segments, each block segment having an additional grooving pattern, wherein the additional grooving patterns extend aligned with each other within the respective patterned block in a top view.

[0020] Another preferred embodiment is that additional groove patterns are provided in the side section of the edge of the pattern block. Each of these additional groove patterns has an end portion facing the edge of the pattern block and shallower than other additional groove patterns. Preferably, these additional groove patterns terminate at a certain distance from the edge of the block before the edge.

[0021] Another preferred embodiment is characterized in that the protrusion is formed by at least one protrusion, particularly a dome-shaped protrusion, and at least one recess, the at least one protrusion being located on one groove wall of the cross-cutting groove pattern, and the at least one recess being located on the other groove wall of the cross-cutting groove pattern and corresponding to the protrusion, wherein the protrusion is particularly formed by at least one central portion of the groove pattern, the at least one central portion of the groove pattern extending in an arc shape in the cross section of the cross-cutting groove pattern. Attached Figure Description

[0022] Further features, advantages, and details of the invention will now be described in more detail with reference to the accompanying drawings, which schematically illustrate exemplary embodiments of the invention. In the drawings:

[0023] Figure 1 A view of the tread blocks of a vehicle pneumatic tire having a first embodiment variant of the present invention is shown.

[0024] Figure 1a It shows Figure 1 A top view of the patterned blocks.

[0025] Figure 1b It shows along Figure 1a The portion of line Ib-Ib,

[0026] Figure 2 A view of the tread blocks of a vehicle pneumatic tire having a second embodiment variant of the present invention is shown.

[0027] Figure 2a It shows Figure 2 A top view of the patterned blocks.

[0028] Figure 2b It shows along Figure 2a The section of line IIb-IIb, and

[0029] Figure 3 It shows Figure 1b A magnified view of the Z3's details.

[0030] List of reference numerals

[0031] 1, 1'....... Patterned Block

[0032] 1a..........Patterned Block Section

[0033] 2........... Circumferential grooves

[0034] 3........... Horizontal grooves

[0035] 4...........Outer surface of the block

[0036] 5, 6... edges of blocks

[0037] 7...........Groove Pattern

[0038] 7a..........Radial outer part of the groove pattern

[0039] 7b..........Central part of the groove pattern

[0040] 7c..........Radial internal part of the groove pattern

[0041] 7d..........Transition section

[0042] 8, 8'.......Additional cutting groove pattern

[0043] 8'a.........End part of the groove pattern

[0044] 9............ Knife-groove patterned wall

[0045] 10.......... Base of the groove pattern

[0046] 11.......... Rubber Area

[0047] 12..........protrusion

[0048] 13..........concave part

[0049] a...........deflection

[0050] b E1 b E2 ......width

[0051] E1..........plane of symmetry

[0052] F1..........Center area of ​​the groove pattern

[0053] L a ...radial outer boundary line

[0054] L i Radial internal boundary line

[0055] l a l b l d ...length

[0056] l1..........Reference Line

[0057] m E1 m E2 ...center line of the groove pattern

[0058] U........... Double arrow (circumferential direction)

[0059] t1, t E1 ......depth

[0060] t E2 ...maximum depth

[0061] T P ... Pattern depth

[0062] Z3..........Details

[0063] α..........complementary angle Detailed Implementation

[0064] The pneumatic tires designed according to the present invention are tires for motor vehicles, particularly tires for multi-rail motor vehicles, and preferably radial tires for passenger motor vehicles, vans or light trucks (permitted gross weight ≤ 7.5t), wherein these tires are designed for use in winter driving conditions or for year-round use.

[0065] Figure 1 and Figure 2 Pattern block 1 is shown. Figure 1 ), 1'( Figure 2 This tread block, in its respective context, belongs to the tread of a pneumatic tire. The circumferential direction of the tire is represented by a double arrow U in its respective context. Tread blocks 1 and 1' are... Figure 1 and Figure 2 The diagram only shows the circumferential grooves 2 and the lateral grooves 3 extending between the circumferential grooves 2, which are also only shown schematically. The tread has multiple tread blocks 1 and / or 1'.

[0066] The circumferential grooves 2 and preferably the lateral grooves 3 are each manufactured in the radial direction to a tread depth T set for the corresponding vehicle's pneumatic tire. P ( Figure 1b , Figure 2b(3 indicates each transverse groove), the depth of which is typically 6.5mm to 12.0mm, particularly 7.0mm to 9.5mm.

[0067] Tread blocks 1 and 1' have an outer surface 4 around the tread periphery, which is defined by a block edge 5 at the circumferential groove 2 and by a block edge 6 at the transverse groove 3. The tread block is provided with four correspondingly designed deeper sipes 7 starting from the outer surface 4 and additional sipes 8 (tread block 1) and 8' (tread block 1') made shallower than the deeper sipes 7 in the radial direction starting from the outer surface 4.

[0068] The deeper groove pattern 7 spans pattern blocks 1 and 1', as shown in the top view (see...). Figure 1a , Figure 2a The observed axial direction extends in a straight line parallel to the block edge 6, wherein the deeper groove pattern 7 is evenly distributed within the patterned blocks 1 and 1', and provides the patterned block segment 1a. For example... Figure 1a and Figure 2a As shown, each groove pattern 7 has a groove pattern centerline m. E1 The center line of the groove pattern extends in a straight line in the top view and is aligned in its extension direction. In the exemplary embodiment, the groove pattern 7 (corresponding to the aforementioned pattern) extends at an angle of 0° with respect to the center line of the groove pattern.

[0069] The further construction of the deeper groove pattern 7 will be explained below with reference to the single deeper groove pattern 7 formed in the pattern block 1.

[0070] according to Figure 3 The groove pattern 7 is defined by two opposing groove pattern walls 9 and a groove pattern base 10, and has a constant width b between the groove pattern walls 9, ranging from 0.4 mm to 1.2 mm, particularly up to 0.8 mm. E1 It has a pattern depth T in the radial direction. P 70% to 100%, especially up to 95% of the maximum depth t E1 (The depth at the deepest point of the groove pattern 7), and has a depth from the center line m of the groove pattern. E1 The central region F1 of the groove pattern (represented by a dashed line) extends centrally through the groove pattern 7. Therefore, the distance between the central region F1 and the groove pattern wall 9 corresponds to the distance shown in the top view, perpendicular to the groove pattern centerline m. E1 Extended cross section (see) Figure 1aAs shown in the diagram (position of the intersecting line Ib-Ib), the groove pattern 7 has a radially extending outer portion 7a, an arc-shaped central portion 7b, and a radially extending inner portion 7c. In the exemplary embodiment shown, rounded transition portions 7d are formed between the central portion 7b and the radially outer portion 7a, and between the central portion 7b and the radially inner portion 7c, respectively. These transition portions 7d ensure a continuous (non-kinked) transition between the groove pattern portions 7a, 7b, and 7c when viewed from the aforementioned cross-section.

[0071] The radial outer portion 7a of the groove pattern (as shown in the top view, with the groove pattern centerline m) E1 (Observed in a vertically oriented section) it has a length l, preferably 1.0 mm to 2.0 mm, defined in the radial direction relative to the center region F1 of the grooving pattern. a The transition sections 7d each have a length similar to l. a The determined, preferably, length l is 0.2 mm to 0.9 mm. d The radial inner portion 7c of the groove pattern (as shown in the top view, coinciding with the center line m of the groove pattern). E1 (Observed in the vertically oriented section) and the radially outer portion 7a of the grooving pattern continues.

[0072] The central portion 7b of the arc-shaped groove pattern forms a protrusion, and (as shown in the top view, it is aligned with the center line m of the groove pattern) E1 (Observed in a vertically oriented section) at the radially outer boundary line L a With radial inner boundary line L i Extending between, the radial outer defining line extends with a constant depth defined in the radial direction relative to the center region F1 of the groove pattern, and the radial inner defining line extends with a constant depth defined in the radial direction relative to the center region F1 of the groove pattern. The central portion 7b of the groove pattern has a boundary line L. a L i The length l, determined in the radial direction, is particularly 1.0 mm to 3.5 mm, preferably 1.5 mm to 3.0 mm. b Furthermore, it has a symmetric plane E1 extending at a constant depth t1 determined in the radial direction. For the symmetric plane E1, tire curvature (i.e., the curvature of the tire profile) is not considered. The aforementioned length l a and l d Selected to make the boundary line L a A distance a1 is made in the radial direction from the outer surface 4 of the block, ranging from 1.0 mm to 2.9 mm, particularly at least 1.2 mm. The constant depth t1, the preferred dimension of which depends on the depth t, will be discussed in more detail later. E2This will also be mentioned.

[0073] Figure 3 A straight reference line l1 connecting the radially outer portion 7a and the radially inner portion 7b of the grooving pattern to the central region F1 of the grooving pattern is also shown. As observed from the cross-section described above, the central portion 7b of the grooving pattern has a maximum deflection 'a' in the plane of symmetry E1, defined as 0.5 mm to 1.5 mm between the reference line l1 and the central region F1 of the grooving pattern. The arc-shaped central portion 7b of the grooving pattern thus has a protrusion 12 and a recess 13, the protrusion being formed on one grooving pattern wall 9 with an arc-shaped cross-section, and the recess being formed on another grooving pattern wall 9 and corresponding to the protrusion 12. The recess 13 protrudes horizontally into the corresponding grooving pattern wall 9 in the region outside the central portion 7b of the grooving pattern, and the protrusion 12 protrudes horizontally from the corresponding grooving pattern wall 9 in the region outside the central portion 7b of the grooving pattern.

[0074] according to Figure 1 and Figure 2 One of the previously mentioned additional groove patterns 8 (pattern block 1) and 8' (pattern block 1') is formed in each pattern block segment 1a of pattern blocks 1 and 1', wherein the additional groove patterns 8 and 8' (as seen in the top view) extend in a straight line parallel to the block edge 3 and are aligned with each other. Figure 1a , Figure 2a ), and protrudes radially into the corresponding patterned block segment 1a. In the exemplary embodiment shown, additional groove patterns 8, 8' (based on their groove pattern center lines m aligned in the extension direction in the top view) are added. E2 ( Figure 1a , Figure 2a The distance between the block edge 5 on the circumferential groove 2 and the corresponding distance between the two.

[0075] like Figure 1a and Figure 2a As shown in the top view, the center line m of the additional tool groove patterns 8 and 8' is... E2 The center line m of the (multiple) cross-shaped groove patterns 7 adjacent to the corresponding pattern block segment 1a E1 Two complementary angles α are formed. The two complementary angles α are complementary to each other up to 180° in a known manner, wherein each complementary angle α deviates from 90° up to 60°, particularly up to 45°, preferably up to 30°, and especially preferably up to 10°. In the exemplary embodiment shown, both complementary angles α are 90°.

[0076] Each additional grooving pattern 8, 8' has a constant width b of 0.3mm to 1.0mm, particularly 0.4mm to 0.6mm. E2 And has a maximum depth t in the radial direction. E2 ( Figure 1b , Figure 2b ), the maximum depth (e.g. Figure 3 The additional groove pattern 8 in pattern block 1 is designed such that the additional groove patterns 8, 8' terminate at the radial outer boundary line L in the radial direction. a With radial inner boundary line L i Between. Maximum depth t E2 The length is 1.5mm to 3.0mm, wherein the above length l a l b l d and length l b The distance a1 corresponds to the corresponding depth t E2 match.

[0077] The constant depth t1 where the previously mentioned symmetry plane E1 extends is preferably greater than the maximum depth t of the additional tool groove patterns 8 and 8'. E2 The difference is 0.5mm to 1.5mm.

[0078] according to Figure 1b The additional groove pattern 8 in the central segment 1a of the pattern block 1 leads to two adjacent cross-cutting groove patterns 7. One end of the additional groove pattern 8 in the edge side segment 1a of the pattern block leads to the adjacent cross-cutting groove pattern 7 and the other end protrudes from the pattern block 1. Each additional groove pattern 8 has a groove end portion 8a at the end of the outer edge of the arc facing the arc-shaped extended central groove portion 7b. This groove end portion is shallower than the other additional groove patterns 8, adjacent to the radially outer portion 7a and the central groove portion 7b, and in the exemplary embodiment, it is located only in the radially outer region of the central groove portion 7b. In the region outside the groove end portion 8a, the additional groove pattern 8 has the aforementioned maximum depth t. E2 .

[0079] according to Figure 2b The additional sipes 8' extending from the central section 1a of the tread block 1' terminate within the central section 1a of the tread block, and each has a sipe centerline m on its tread periphery. E2 The distance a2 (measured in the extension, which is 0.1 mm to 0.3 mm away from the cross-cutting groove pattern 7) is... Figure 2aEach additional serration 8' has a serration end portion 8'a at its outer end facing the arc of the central portion 7b of the serration extending in an arc shape. This serration end portion is shallower than the other additional serrations 8 and is located in a region radially outer of the central portion 7b. Between each additional serration 8' and the (multiple) spanning serrations 7 adjacent to the corresponding serration block segment 1a, a thin rubber region 11 is retained in each case, wherein the aforementioned serration end portion 8'a is preferably designed such that the thin rubber region 11 has a constant thickness. In the region outside the serration end portion 8'a, each additional serration 8' has the aforementioned maximum depth t. E2 .

[0080] The present invention is not limited to the exemplary embodiments described.

[0081] The additional groove pattern may also have two groove end portions, which are shallower in the radial direction than other additional groove patterns, and in a top view, may appear wavy or serrated, for example. Furthermore, additional groove patterns may be provided, which have local protrusions and corresponding recesses on the groove pattern walls. The additional groove patterns are designed such that the maximum depth point is located horizontally within the radially outer boundary line of the protrusion. The "maximum depth point" is understood to represent the region where the maximum depth exists.

[0082] The grooving patterns spanning the pattern blocks extend at an angle of 0° to 50° with respect to their grooving centerlines, as observed in a top view. The spanning grooving patterns may extend at least partially in a wavy manner in a top view, wherein the base wave is particularly a "rounded" wave (e.g., a sine wave), a rectangular wave, a trapezoidal wave, or a sawtooth wave.

[0083] Additional grooving patterns and spanning grooving patterns can be generally curved (arc-shaped) in the top view, such that they have grooving centerlines that extend in an arc shape (in a circular arc shape) in the top view. Therefore, for example, additional grooving patterns that extend in a wavy manner and simultaneously in a generally curved manner in the top view and / or grooving patterns that extend in a wavy manner and simultaneously in a generally curved manner in the top view can be provided. In the case of additional grooving patterns and / or grooving patterns that extend in a generally curved manner in the top view, the specified angles and complementary angles are determined relative to the straight line connecting the ends of the continuously curved grooving centerlines. For example, if a combination of spanning grooving patterns with grooving centerlines that are straight in the top view and additional grooving patterns with grooving centerlines that extend in a curved manner in the top view is provided, the complementary angle between the grooving centerline of the corresponding spanning grooving pattern and the straight line connecting the ends of the continuously curved grooving centerlines of the additional grooving pattern is determined.

[0084] The central portion of the sipe pattern, as described in the exemplary embodiment and extending in an arcuate manner, forms a protrusion spaced apart from the tread periphery. The protrusion is formed at least by a partial bulge formed on one sipe wall and a partial recess formed on another sipe wall opposite the bulge, wherein the bulge and recess have corresponding forms such that the width of the sipe pattern in the protrusion region is constant. The protrusion need not extend over the entire sipe pattern, but can be formed locally, for example, with a dome-shaped curvature, such that it is located only in a certain region of the sipe pattern and is manufactured to the maximum depth of the sipe pattern, which, in a top view, extends over a portion of the sipe pattern. The shape of the protrusion is variable. Furthermore, each sipe pattern may have multiple protrusions, which are particularly continuous with each other in the radial direction and form an S-shaped central portion of the sipe pattern.

[0085] Each protrusion extends between a radially outer boundary line and a radially inner boundary line. The radially outer boundary line is based on the central region of the groove pattern and extends through the outermost radial point of the protrusion to a constant depth determined in the radial direction. The same applies to the radially inner boundary line. In the case of correspondingly asymmetrical protrusions, the outermost and innermost radial points of the protrusions do not lie in the same cross-sectional plane. In this case, the outermost radial point of the protrusion is offset relative to the innermost radial point of the protrusion in the direction of extension of the groove pattern.

[0086] The tread has tread blocks, each tread block having at least one cross-shaped sipe with a protrusion. Preferably, at least 30% of the corresponding tread blocks have cross-shaped sipes with protrusions and additional sipes.

Claims

1. A vehicle pneumatic tire having a tread having tread blocks (1, 1'), each of the tread blocks having an outer surface (4) and at least one sipe (7) in a top view extending at an angle of 0° to 50° with respect to the axial direction, crossing the respective tread blocks (1, 1'), dividing into block segments (1a), and having a width (b) of 0.4 mm to 1.2 mm. E1 ), the maximum depth of 70% to 100% of the pattern depth (t) E1 ), two grooved wall sections (9), and grooved central areas (F1) spaced apart by these grooved wall sections (9), wherein, The cross-cutting groove pattern (7) is manufactured to the maximum depth (t) in at least the groove pattern area extending on a portion of the groove pattern (7) in the top view. E1 It also has a protrusion (7b) that is a certain distance from the outer surface (4) of the block and is formed on the radially outer boundary line (L) as seen in the corresponding section perpendicular to the center region (F1) of the groove pattern. a ) and radial inner boundary line (L i Between the two points, the outer radial demarcation line extends through the outermost radial point of the protrusion (7b) with a constant first depth determined in the radial direction relative to the center region (F1) of the groove pattern, and the inner radial demarcation line extends through the innermost radial point of the protrusion (7b) with a constant second depth determined in the radial direction relative to the center region (F1) of the groove pattern. Its features are, In each case, at least one additional grooving pattern (8, 8') is formed in the block segment (1a) of these pattern blocks (1, 1'), the at least one additional grooving pattern being elongated in the top view and having a width of 0.3 mm to 1.0 mm (b). E2 ) and maximum depth (t) E2 The additional grooving patterns (8, 8') and the spanning grooving pattern (7) form complementary angles (α), these complementary angles deviating from 90° to 60°, and the at least one additional grooving pattern has grooving end portions (8a, 8'a) in the region radially outside the protrusion (7b) of the spanning grooving pattern (7), wherein the maximum depth (t) of the additional grooving pattern (8, 8') is... E2 The point is located at the radial outer boundary line (L) of the protrusion (7b). a The radial interior of ).

2. The vehicle pneumatic tire as described in claim 1, characterized in that, The maximum depth (t) of the additional groove pattern (8) E2 The point is located at the radial inner boundary line (L) of the protrusion (7b). i The radial outside of ).

3. The vehicle pneumatic tire as described in claim 1, characterized in that, The maximum depth (t) of the additional groove pattern (8) E2 The diameter ranges from 1.5 mm to 3.0 mm.

4. The vehicle pneumatic tire as described in any one of claims 1 to 3, characterized in that, The radial outer boundary line (L) a (a1) is a distance of 1.0 mm to 2.9 mm from the outer surface (4) of the block in the radial direction.

5. The vehicle pneumatic tire as described in claim 4, characterized in that, The radial outer boundary line (L) a (a1) is at least 1.2 mm away from the outer surface (4) of the block in the radial direction.

6. The vehicle pneumatic tire as described in any one of claims 1 to 3, characterized in that, The protrusion (7b) has a symmetrical plane (E1) extending with a constant depth (t1) determined in the radial direction, wherein the maximum depth (t1) of the additional grooving pattern (8, 8') is... E2 The point is located radially outside the plane of symmetry (E1), and the constant depth (t1) where the plane of symmetry (E1) extends is greater than the maximum depth (t) of the additional tool groove pattern (8, 8'). E2 ) Larger than 0.5 mm to 1.5 mm.

7. The vehicle pneumatic tire as described in any one of claims 1 to 3, characterized in that, The additional groove pattern (8) extends in a straight line in the top view.

8. The vehicle pneumatic tire as described in any one of claims 1 to 3, characterized in that, The additional groove pattern (8) leads to the cross-shaped groove pattern (7) or, in the top view, to the center line (m) of the groove pattern. E2 The distance (a2) between the extension of the ) and the cross-shaped groove pattern is determined at 0.1 mm to 0.3 mm and terminates in front of the groove pattern.

9. The vehicle pneumatic tire as described in any one of claims 1 to 3, characterized in that, The groove pattern (7) has a radially outer portion (7a) that extends in the radial direction between the protrusion (7b) and the outer surface (4) of the block and has a length (l) of 1.0 mm to 2.0 mm relative to the central region (F1) of the groove pattern. a ).

10. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, The tread is provided with tread blocks (1, 1'), each of which has at least one additional sipe (8, 8') in each block segment (1a), the at least one additional sipe being elongated in top view, wherein at least 30% of all the tread blocks (1, 1') of the tread are designed in this manner.

11. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, Patterned blocks (1, 1') are provided, which are adjacent to grooves extending at an angle of 0° to 60° with the coaxial direction, wherein these additional grooving patterns (8, 8') extend parallel to and at a distance corresponding to the grooves in the top view.

12. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, Additional tool groove patterns (8, 8') are provided, in which these complementary angles (α) deviate from 90° to 45°.

13. The vehicle pneumatic tire as described in claim 12, characterized in that, Additional tool groove patterns (8, 8') are provided, in which these complementary angles (α) deviate from 90° to 30°.

14. The vehicle pneumatic tire as described in claim 12, characterized in that, Additional tool groove patterns (8, 8') are provided, in which these complementary angles (α) deviate from 90° to 10°.

15. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, Additional tool groove patterns (8, 8') are provided, in which the complementary angles (α) are 90°.

16. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, Patterned blocks (1, 1') are provided, each having at least two block segments (1a) in its respective case, each block segment having additional groove patterns (8, 8'), wherein these additional groove patterns (8, 8') extend aligned with each other within the respective patterned block (1, 1') in a top view.

17. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, Additional groove patterns (8, 8') are provided in the block section (1a) on the edge side. Each of these additional groove patterns has a groove end portion facing the block edge of the pattern block (1, 1') and shallower than other additional groove patterns (8, 8'). The additional groove patterns (8, 8') terminate at a certain distance from the block edge before the block edge.

18. The vehicle pneumatic tire as claimed in any one of claims 1 to 3, characterized in that, The protrusion (7b) is formed by at least one protrusion (12) and at least one recess (13), the at least one protrusion being located on one groove wall (9) of the spanning groove pattern (7), and the at least one recess being located on the other groove wall (9) of the groove pattern (7) and corresponding to the protrusion (12), wherein the protrusion (7b) is formed by at least one groove central portion (7b) extending arcuately in the cross section of the spanning groove pattern (7).

19. The vehicle pneumatic tire as described in claim 18, characterized in that, The protrusion (12) is a dome-shaped protrusion.

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