Vehicle tyre

Abstract

The invention relates to a vehicle tyre (1), in particular a pneumatic vehicle tyre, comprising sidewalls (2), a tread (3) and at least one hatched surface (4) on at least one of the sidewalls (2) and / or the tread (3), wherein the hatched surface (4) has elongate hatching ribs (5) which extend next to one another and which have longitudinal extension directions (ER) that extend in parallel or largely in parallel with one another. The hatching ribs (5) each extend, as viewed in plan view, in a regular wave shape and are each composed of adjoining rib portions (5a), which extend in the form of baseless isosceles trapezoids correspondingly orientated with respect to the longitudinal extension direction (ER) or in the form of arcs correspondingly oriented with respect to the longitudinal extension direction (ER), wherein two free-ended additional ribs (6) branch off from each rib portion (5a) at the side of the hatching ribs (5) at which a hatching-rib base line (bSR) extending along the trapezoid base or along the chord of the arcs is located.

Description

[0001]202202018 Description Vehicle Tire The invention relates to a vehicle tire, in particular a pneumatic vehicle tire, with sidewalls and a tread and with at least one hatched area on at least one of the sidewalls and / or the tread, wherein the hatched area has elongated hatched ribs running alongside one another with longitudinal extension directions running parallel to one another or largely parallel to one another. Hatched areas are usually embossed into the outside of the tire during the vulcanization of the tire by means of a shaping vulcanization mold, which has a negative contour of the relevant hatched area on a molding surface. On an already vulcanized tire, a hatched area or a surface element forming a structured hatched area can be formed by removal,by engraving or an additive process. Hatched areas formed on the sidewalls or shoulder flanks of the vehicle tire primarily serve the purpose of creating a contrast to existing smooth surface areas on the sidewalls or shoulder flanks of the vehicle tire, with particular attention being paid to good visibility and recognizability, for example, to visually highlight lettering, pictorial elements, company logos, other trademarks, and the like on the sidewalls. The same applies to hatched areas located on the groove flanks of grooves in the tread. The hatched area can be part of the lettering, pictorial elements, company logos, or other trademarks, or it can completely or partially surround or encircle them. Hatched areas can also be used to conceal design-related unevenness on the sidewalls. 202202018 Vehicle tires of the type mentioned above,which have hatched areas on sidewalls with adjacent hatched ribs are known, for example, from EP 2502758 A1 and DE 102008010486 A1. The scattering of light on the flanks of hatched ribs reduces the degree of light reflection at the tire surface, thereby altering the brightness of the hatched area, and the hatched area usually appears darker than essentially smooth surface areas free of hatched areas. In particular, hatched areas consisting of parallel hatched ribs can be very well engraved as negative contours into a mold surface of a vulcanization mold for the shaping vulcanization of the vehicle tire, for example by means of a laser, and subsequently imprinted qualitatively into the rubber material during the vulcanization of the tire.However, their contrast effect is highly dependent on the direction of the light incidence. The contrast can therefore decrease suddenly at certain viewing angles. The invention is therefore based on the object of specifically influencing, in particular increasing, the contrast effect of the hatched area(s) with hatched ribs in a vehicle tire of the type mentioned at the beginning in all lighting situations and angles of light incidence, and at the same time finding a good compromise between an improved contrast effect and effective producibility - with regard to the tire vulcanization mold. The stated object is achieved by a vehicle tire according to claim 1, a vulcanization mold according to claim 14 and a method according to claim 15. The vehicle tire according to the invention is characterized in that the hatched ribs, viewed in plan view,each run in a regular wave shape and are each composed of adjoining rib sections, which run in the form of baseless isosceles trapezoids oriented consistently with respect to the longitudinal direction 202202018 or in the form of arches oriented consistently with respect to the longitudinal direction, with two freely ending additional ribs branching off from each rib section on that side of the hatched ribs on which a hatched rib base line running along the trapezoid bases or along the bow chords of the arches is located. The hatched ribs, which run in a wave-like manner according to the invention, together with the additional ribs, provide a plurality of rib flanks running in different directions, at which light incident from all possible directions is scattered, repeatedly reflected, and absorbed in such a way thatthat a particularly high contrast effect is achieved. Therefore, the hatched areas appear particularly dark and high-contrast from all viewing angles. Additionally, shadow effects occur, which particularly on the black rubber of the vehicle tire clearly emphasize the hatched area. Contrast measurements carried out using an integrating sphere demonstrate the excellent contrast effect of the hatched areas. In each case, a contrast value was determined, which results from the ratio of the measured black value of the hatched area to the measured black value of the surrounding, smooth surface. For hatched areas designed according to the invention, a contrast value of approximately 2.7 was determined. In contrast, standard hatched areas originating from a negative contour milled into a mold surface of a vulcanization mold have a contrast value of approximately 1.3 to 1.5. A first preferred embodiment is characterized in thatthat the additional ribs, which branch off from the same rib section, viewed in plan view, extend in a V-shape to one another and are inclined in opposite directions relative to the longitudinal direction of the hatching rib, and approach one another in the direction of the hatching rib. This further improves the contrast effect of the hatching ribs, regardless of the direction of incidence of the light, at all viewing angles. In this preferred embodiment, it is advantageous if the additional ribs, which branch off from the same rib section, viewed in plan view, are inclined at the same angle relative to the longitudinal direction of the hatching rib. This further improves the light scattering at the hatching ribs. Furthermore, in this preferred embodiment, it is advantageous if the additional ribs, which run in a V-shape to one another, form an angle of 15° to 25°, in particular of 18° to 22°.This ensures a particularly advantageous "density" of the additional ribs with regard to light scattering at the additional ribs. A further preferred embodiment is characterized in that the additional ribs, which branch off from the same rib section, adjoin the respective hatched rib at a mutual distance. This contributes to a further increase in the contrast value of the hatched area. According to a further preferred embodiment, the additional ribs, viewed in plan view, pass the hatched rib base line, wherein the additional ribs, viewed in plan view, preferably each have a first additional rib section running from the hatched rib base line to the hatched rib and a second additional rib section adjoining this second additional rib section, which is longer than the first additional rib section. The additional ribs therefore protrude significantly from the hatched ribs,This is also beneficial for the contrast value. The additional ribs preferably have a width that decreases continuously towards the hatched rib. As a result, the mutual connection area of ​​each additional rib to the hatched rib is formed with particular detail and precision during tire vulcanization, further improving the contrast effect. 202202018 A further preferred embodiment is characterized in that the rib sections extend in the form of baseless isosceles trapezoids, so that each rib section is composed of a rib section part forming the short base side of the trapezoid and two rib section parts each forming a trapezoid leg.wherein one additional rib extends from the mutual connection area of ​​the rib section forming the short base side of the trapezoid to the rib section forming one trapezoid leg, and the other additional rib extends from the mutual connection area of ​​the rib section forming the short base side of the trapezoid to the rib section forming the other trapezoid leg. In this embodiment, too, the mutual connection area of ​​each additional rib to the hatched rib is formed with particular attention to detail and precision during tire vulcanization. The contrast effect is thus further improved. According to a further preferred embodiment, the additional ribs each have an extension length of 0.30 mm to 0.50 mm, in particular of 0.35 mm to 0.45 mm. Furthermore, it is advantageous for the contrast effectif the rib sections of all hatched ribs are oriented in the same direction with respect to the longitudinal direction and thus point in the same direction with respect to the longitudinal direction. This allows the hatched ribs to be arranged at a particularly high density and, at the same time, to be formed with great detail. A further preferred embodiment is characterized in that hatched ribs that run adjacent to one another have a mutual distance of at least 0.50 mm and in particular of up to 0.80 mm, based on the hatched rib base lines and determined perpendicularly to these. 202202018 A likewise preferred embodiment, which further improves the contrast effect, is characterized in that the hatched ribs that run directly next to one another,are offset from one another in their longitudinal direction. In a particularly preferred variant, the first preferred embodiment is combined with the last-mentioned preferred embodiment in such a way that the hatching ribs, which run directly next to one another, are offset from one another in their longitudinal direction such that, viewed in plan view, - for each middle hatching rib having two adjacent hatching ribs, the additional ribs forming one V-leg and running parallel to one another are aligned with the corresponding additional ribs from one adjacent hatching rib, and the additional ribs forming the other V-legs and running parallel to one another are aligned with the corresponding additional ribs from the other adjacent hatching rib, and - for each hatching rib having one adjacent hatching rib,In the edge-side hatching rib, only the additional ribs forming a V-shaped leg, which run parallel to one another, are aligned with the corresponding additional ribs from the adjacent hatching rib. A further preferred embodiment is characterized in that between the additional ribs branching off from the same rib section, a free-standing, peg-shaped elevation is formed, which has a maximum height of 0.05 mm to 0.80 mm, in particular of 0.10 mm to 0.50 mm, wherein the maximum height of the peg-shaped elevation is preferably smaller than the maximum height of the additional ribs and / or wherein the maximum height of the peg-shaped elevation is preferably smaller than the maximum height of the hatching ribs. The peg-shaped elevations therefore occupy corresponding free spaces in the area between the additional ribs,whereby the contrast effect is also improved. 202202018 The invention further relates to a vulcanization mold for the formative vulcanization of a vehicle tire according to one or of claims 1 to 14, wherein the vulcanization mold has at least one molding surface which has a negative contour of a hatched surface with adjacent, elongated hatched ribs with longitudinal extension directions running parallel to one another or largely parallel to one another, wherein the negative contour has the following: - first depressions for forming hatched ribs which, viewed in plan view, each run in a regular wave shape and are each composed of adjoining rib sections which are in the form of rib sections oriented in the same way with respect to the longitudinal extension direction,baseless isosceles trapezoids or in the form of arcs oriented in the same direction of longitudinal extension, and - second depressions for forming two freely ending additional ribs branching off from each rib section on that side of the hatched ribs on which a hatched rib base line running along the trapezoid bases or along the bow chords of the arcs is located. Furthermore, the invention relates to a method for producing a vehicle tire according to one of claims 1 to 14, wherein the method comprises the following steps: a) engraving a negative contour for forming a hatched area into a mold surface of a vulcanization mold for the formative vulcanization of a vehicle tire by means of laser engraving, wherein the negative contour has the following: - first depressions for forming hatched ribs, which, viewed in plan view,each extend in a regular wave shape and are each composed of adjoining rib sections which extend in the form of baseless isosceles trapezoids oriented consistently with respect to the longitudinal direction of extension or in the form of arcs oriented consistently with respect to the longitudinal direction of extension, and - second recesses for forming two freely ending additional ribs branching off from each rib section on that side of the hatched ribs on which a hatched rib base line running along the trapezoid bases or along the bow chords of the arcs is located, b) shaping vulcanization of a green tire by means of the vulcanization mold, whereby a hatched surface with hatched ribs and additional ribs is embossed into an outer surface of the vehicle tire, in particular a sidewall and / or the tread of the vehicle tire. Further features,Advantages and details of the invention will now be described in more detail with reference to the drawing, which schematically shows exemplary embodiments of the invention. Fig. 1 shows a view of a vehicle tire with hatched areas, Fig. 2 shows a schematic, enlarged plan view of a section of a hatched area with a first embodiment of the invention, wherein longitudinal sections of hatched ribs can be seen, Fig. 3 shows a schematic oblique view of a part of the section from Fig. 2, Fig. 4 shows a schematic oblique view of a part of the section from Fig. 2, wherein the oblique view is based on a scan created with an electron microscope, Fig. 4a shows the photographic image of the scan belonging to Fig. 4, Fig. 4b shows a plan view of a part of the image of the scan from Fig. 4a, 202202018 Fig. 5 shows a section along the line VV of Fig. 4, Fig. 4a and Fig. 4b, wherein the section is based on the scan, Fig. 6 shows a schematic,Enlarged plan view of a section of a hatched area with a second embodiment of the invention, wherein longitudinal sections of hatched ribs can be seen, Fig. 7 is an oblique view of a part of the section from Fig. 6, wherein the oblique view is based on a scan created with an electron microscope, and Fig. 7a is the photographic image of the scan associated with Fig. 7. Fig. 1 shows a circumferential section of a vehicle tire 1 with sidewalls 2, a tread 3, and hatched areas 4 on the outside of one sidewall 2 and, indicated, on the tread 3. The vehicle tire is preferably a pneumatic vehicle tire, in particular for passenger cars, vans, SUVs, light trucks, commercial vehicles, motorcycles, buses, or bicycles. The hatched areas 4 are surface elements that can be implemented in any desired external form, for example as a pictorial design, as a logo, or as characters.The hatched areas 4 can also be formed on groove flanks and / or groove bottoms of grooves formed in the tread 3 or at the tread end, i.e. on the shoulder flanks extending outside the ground contact area to the sidewalls. As shown in Fig. 2 and Fig. 3, the hatched area 4 has elongated and adjacent hatched ribs 5 with a longitudinal extension direction ER (Fig. 2), wherein the hatched ribs 5, viewed in plan view (Fig. 2), extend in a regular wave shape. The longitudinal extension direction ER is a straight line in the embodiment shown,However, it can also preferably run in an overall curved or wavy manner. 202202018 In the following, an idealized shape of the hatched area 4 and the hatched ribs 5 belonging to it (shown in Fig. 2 and Fig. 3) will first be explained, followed by a discussion of the differences to the shape of the hatched area 4 actually found on the vehicle tire (shown in Fig. 4, Fig. 4a, Fig. 4b, Fig. 5). According to Fig. 2, the hatched ribs 5 each have a hatched rib base line bSR running in the longitudinal direction ER, with respect to which the maximum deflection a of the waveform corresponding to twice the amplitude of the waveform is determined. The hatched ribs 5 furthermore each have a hatched rib center line mSR which follows their course in plan view and are each composed of adjoining rib sections 5a which, viewed in plan view, are in the form of ribs oriented in the same way with respect to the longitudinal direction ER,baseless isosceles trapezoids. In the exemplary embodiment, the rib sections 5a of all hatched ribs 5 are oriented in the same way with respect to the longitudinal direction ER and thus point in the same direction with respect to the longitudinal direction ER. The hatched rib base line bSR runs along the missing trapezoid bases of the trapezoids and refers to the hatched rib center line mSR. The rib sections 5a can therefore be mapped onto one another by parallel displacement in the longitudinal direction ER. Each rib section 5a is composed of a rib section part 5a1 forming the short base side of the trapezoid, which is straight in plan view and runs in the longitudinal direction ER, and two rib section parts 5a2 each forming a trapezoid leg and running straight in plan view. Due to the course of the hatched ribs 5, the adjacent rib sections belonging to different rib sections 5a formThe rib section parts 5a2 forming trapezoidal legs each have an inner corner region 5b and a pointed outer corner region 5c at their mutual connection, wherein the rib section parts 5a2 at the inner corner regions 5b enclose with each other an interior angle α of 80° to 120°, in particular of 85° to 110°, preferably of up to 95°, relative to the hatched rib center line mSR. The rib sections 5a each have an extension length ea of ​​0.40 mm to 1.00 mm, in particular of 0.50 mm to 0.80 mm, relative to the hatched rib base line bSR. The rib section parts 5a1 each have an extension length ea1 (rib section part 5a1), ea2 (rib section part 5a2) determined along the hatched rib center line mSR, wherein the extension length ea1 is preferably 0.15 mm to 0.40 mm, in particular up to 0.30 mm, preferably from 0.20 mm to 0.25 mm, and is preferably adapted to the interior angle α in such a way thatthat the extension length ea2 corresponds to the extension length ea1 or deviates from it by a maximum of 0.05 mm. As shown in Fig. 2 and Fig. 3, on the side of each hatched rib 5 where the hatched rib base line bSR (Fig. 2) is located, two freely ending additional ribs 6 branch off from each rib section 5a (Fig. 2). These additional ribs 6, which are straight in plan view and extend in a V-shape relative to each other and pass the hatched rib base line bSR (Fig. 2),wherein an additional rib 6 extends from the mutual connection area of ​​the rib section part 5a1 with the rib section part 5a2 forming one trapezoidal leg, and an additional rib 6 extends from the mutual connection area of ​​the rib section part 5a1 with the rib section part 5a2 forming the other trapezoidal leg. Regarding the V-shape, the V-tip is thus replaced by the rib section part 5a1 extending between the respective additional ribs 6 extending in a V-shape relative to one another. According to Fig.2, the additional ribs 6 together with the rib sections 5a can be mapped onto one another by parallel displacement in the longitudinal direction ER, wherein the additional ribs 6, each viewed in plan view, have a rib center line mZ following their course and continuing up to the hatched rib center line mSR, an extension length eZ determined along the rib center line mZ of 0.30 mm to 0.50 mm, in particular of 0.35 mm to 0.45 mm,and have a width that continuously decreases relative to the hatched rib 5 and is determined in plan view perpendicular to the rib center line mZ 202202018. Additional ribs 6, which branch off from the same rib section 5a, are inclined in opposite directions relative to one another with respect to the longitudinal direction ER in such a way that a mutual distance aZ determined between them in the longitudinal direction ER and related to the rib center line mZ continuously increases with increasing distance from the rib section part 5a1 and they enclose an angle β with respect to the rib center lines mZ of 15° to 25°, in particular of 18° to 22°. Preferably, the additional ribs 6, viewed in plan view, are inclined to the same extent (at a similarly large angle) relative to the longitudinal direction ER. The additional ribs 6, viewed in plan view, each have afirst additional rib section 6a and a second additional rib section 6b adjoining the latter and longer than the first additional rib section 6a. Within each hatched rib 5, the additional ribs 6 thus include additional ribs 6 running parallel to one another in plan view, and these additional ribs 6 include additional ribs 6 inclined in opposite directions with respect to the longitudinal extension direction ER, also running parallel to one another in plan view. If the extension lengths ea1, ea2 match, the extension length eZ is particularly preferably at least 0.10 mm greater than the extension lengths ea1, ea2. If the extension length ea1 deviates from the extension length ea2, the extension length eZ is particularly preferably at least 0.10 mm greater than the larger of the two extension lengths ea1,ea2. The hatching ribs 5 running side by side within a hatching area 4 are offset from one another in their longitudinal direction ER. The offset is preferably designed such that, viewed in plan view, for each two adjacent hatching ribs 5 having,middle hatch rib 5 202202018 the additional ribs 6 running parallel to one another are aligned with the corresponding additional ribs 6 from one adjacent hatch rib 5, and the other additional ribs 6 running parallel to one another are aligned with the corresponding additional ribs 6 from the other adjacent hatch rib 5. Accordingly, for each edge-side hatch rib 5, only the additional ribs 6 running parallel to one another are aligned with the corresponding additional ribs 6 from the adjacent hatch rib 5. Adjacent hatch ribs 5 have a mutual distance aSR of at least 0.50 mm and in particular of up to 0.80 mm, based on the hatch rib base lines bSR and determined perpendicular to these. According to Fig. 3, the hatch ribs 5 are preferably located on a hatch background 7,which is, for example, the bottom of a shallow depression formed in the sidewall 2 (Fig. 1) of the tire. The hatched ribs 5 are thus elevations extending from the hatched base 7, i.e. formed thereon, and have a trapezoidal, triangular, or triangular-like cross-section with a tip region 8a and two rib flanks 8b sloping toward the hatched base 7, each of which extends at an acute angle γ of up to 10°, in particular from 2° to 10°, preferably from 3° to 5°, to a perpendicular to the hatched base 7 and merges into the hatched base 7 via a kink or a curve. The hatched ribs 5 furthermore have a maximum height hSR (height at the highest point) determined perpendicular to the hatched base 7 of 0.10 mm to 0.80 mm, preferably 0.20 mm to 0.50 mm, particularly preferably 0.25 mm to 0.35 mm. The tip region 8a is formed as a 0.05 mm to 0.10 mm wide,A plateau extending continuously across the entire hatched rib 5 is formed. In an alternative embodiment, the tip region 8a is a curve between the upper ends of the rib flanks 8b. 202202018 The additional ribs 6 have a trapezoidal, triangular, or triangular-like cross-section consistent with the hatched rib 5, have a tip region 9a and rib flanks 9b, which also enclose the aforementioned angle γ (not shown) with a perpendicular to the hatched base 7 and merge into the hatched base 7 via a kink or curve. The additional ribs 6 have a maximum height hZ determined perpendicular to the hatched base 7, which corresponds to the maximum height hSR of the hatched ribs 5. At their free ends, the additional ribs 6 have a front flank 9c, which in the illustrated embodiment is a largely flat surface.which is a surface sloping downwards in the direction of the hatching base 7 at an angle of up to 5° determined relative to a reference line perpendicular to the hatching base 7 or runs perpendicular to the hatching base 7 and preferably substantially parallel to the direction of extension ER (cf. Fig. 1). In an alternative embodiment not shown, the front flank 9c is designed as a rounded area between the rib flanks 9b. Fig. 4 shows a schematic oblique view of the hatching area 4, Fig. 4a shows an oblique view of a scan of the hatching area 4 created with an electron microscope and Fig. 4b shows a plan view of part of the scan from Fig. 4a. Fig. 5 shows a section along the line VV of Fig. 4, Fig. 4a and Fig. 4b. In comparison to the idealized shape of the hatched area 4 shown in Fig.2 and Fig.3, the hatched area 4 actually found on the tire – as Fig.4,Fig. 4a and Fig. 4b show an irregularity extending across the entire hatched area 4, which is due to the manufacturing process, which will be discussed later. The hatched base 7 has a comprehensive, irregular roughness (Fig. 4a, Fig. 4b, Fig. 5), and the rib flanks 8b, 9b and the end flanks 9c each have an irregular, slight undulation. The rib flanks 8b, 9b and the end flanks 9c are therefore essentially flat, unstructured surfaces. Furthermore, the tip regions 8a, 9a (Fig. 4, Fig. 4a) are characterized by a height that changes irregularly and to an extremely small extent, so that the maximum height hSR, hZ (Fig. 3) is subject to a certain fluctuation. In Fig.4b and Fig.5 several measuring points Mi, i = 1 to 5 are shown, at each of which the maximum height perpendicular to the hatching base 7 was determined. As Fig.5 shows, in the section shown, various,to the adjacent, respective lowest level of the hatching base 7, maximum heights are present at the tip regions 8a, 9a (Fig.4). The maximum heights determined in Fig.5 relative to the lowest level of the hatching base 7 on the left are marked with an *. The following maximum heights were measured in the section shown: h1 = 0.276 mm h2 = 0.293 mm h2* = 0.291 mm h3* = 0.270 mm h4 = 0.283 mm h5 = 0.288 mm h5* = 0.268 mm The irregularities caused by the manufacturing process mean that the “constant” maximum height varies within an interval of up to 0.03 mm. Fig.6 and Fig.7 show a section of a hatching area 4', which is a variant of the hatching area 4. The hatching area 4' differs from the hatching area 4 in that in the area of ​​each hatching rib 5 between the additional ribs 6 running in a V-shape there is a point-like, free-standing,a cone-shaped elevation 10 is formed overall. The cone-shaped elevation 10 has a maximum height hE (Fig. 7) of 0.05 mm to 0.80 mm, in particular from 0.10 mm to 0.50 mm, wherein the maximum height hE is preferably smaller than the maximum height hZ (Fig. 3) of the additional ribs 6 and smaller than the maximum height hSR (Fig. 3) of the hatched ribs 5. Fig. 7a shows an oblique view of a scan of the hatched area 4' created with an electron microscope. The following describes a method for producing the pneumatic vehicle tire with the hatched areas 4. The hatched areas 4 are produced on the surface of a vehicle tire 1, for example on the sidewall 2, during the shaping vulcanization of the vehicle tire 1. For this purpose, the vulcanization mold used has a molding surface,which contains a negative contour of the hatched areas 4 to be created. The method for producing the vehicle tire 1 comprises the following steps: a) engraving of a negative contour for forming a hatched area 4 into a molding surface of a vulcanization mold for the formative vulcanization of a vehicle tire 1 by means of laser engraving, wherein the negative contour has first depressions for forming the hatched ribs 5 and second depressions for forming the additional ribs 6, b) formative vulcanization of a green tire by means of the vulcanization mold, whereby a hatched area 4 with hatched ribs 5 and additional ribs 6 is engraved into an outer surface of the vehicle tire, in particular a sidewall and / or the tread of the vehicle tire,is embossed. The invention is not limited to the described embodiments. Hatch ribs of a hatch area running side by side can also run without offset or arbitrarily offset from one another in the longitudinal direction ER. The rib sections of the hatch ribs can, viewed in plan view, also run in the form of arcs oriented in the same direction with respect to the longitudinal direction ER (and therefore in the shape of a circular arc), wherein on that side of the hatch ribs on which a hatch rib base line running along the 202202018 bow chords of the arcs is located,Two freely ending additional ribs branch off from each rib section. The hatched ribs and the additional ribs can have a cross-sectional shape that differs from the described cross-sectional shape. Preferably, the hatched ribs and the additional ribs have a cross-sectional shape that is symmetrical with respect to a perpendicular to the hatched base. The rib flanks can be convexly or concavely curved overall or at least over most of their extent, with the transition to the hatched base occurring via a kink or a rounding, and with the aforementioned angle β being present between a straight line connecting the end points of the curved rib flanks. Furthermore, the rib flanks can be stepped, with the angle β being determined between a straight line connecting both ends of the rib flank. In addition, the rib flanks can be structured, i.e., provided with a surface structure, for example, with a roughness,so that they are provided with the smallest structures. The hatched ribs can run essentially parallel to one another in plan view, based on their longitudinal extension directions, whereby "hatched ribs running essentially parallel to one another" is understood to mean those whose extension directions deviate from one another by up to 5°. Furthermore, the hatched ribs can run in a curved manner in plan view, based on their longitudinal extension directions. In the case of hatched ribs running essentially parallel to one another and in a curved manner, the angle by which the extension directions of the hatched ribs can deviate from one another refers to tangents running parallel to one another and applied to the respective hatched rib base lines bSR. 202202018 List of Reference Symbols 1........................... Vehicle tire 2........................... Sidewall 3........................... Tread 4,4' ...................... Hatching area 5........................... Hatching rib 5a ......................... Rib section 5a1....................... Rib section part 5a2....................... Rib section part 5b ......................... Inside corner area 5c ......................... Outside corner area 6........................... Additional rib 6a ......................... Additional rib section 6b ......................... Additional rib section 7........................... Hatching base 8a ......................... Tip area 8b ......................... Rib flank 9a ......................... Tip area 9b ......................... Rib flank 9c ......................... Front flank 10......................... Elevation a ........................... Maximum deflection aSR, aZ .................. Distance bSR ....................... Hatching rib base line ea, ea1, ea2, eZ ....... Extension length ER ......................... Longitudinal extension direction hE, hSR,hZ ............ maximum height h1, h2, h4, h5.......... maximum height 202202018 h2*, h3*, h5* ........... maximum height Mi, i =1 to 5.............. measuring point mSR ...................... hatch rib center line mZ ........................ rib center line α ........................... interior angle β, γ ....................... angle,

Claims

202202018 Patent Claims 1. Vehicle tire (1), in particular pneumatic vehicle tire, with sidewalls (2) and a tread (3) and with at least one hatched area (4) on at least one of the sidewalls (2) and / or the tread (3), wherein the hatched area (4) has hatched ribs (5) running side by side in an elongated manner with longitudinal extension directions (ER) running parallel to one another or largely parallel to one another, characterized in that the hatched ribs (5), viewed in plan view, each run in a regular wave shape and are each composed of adjoining rib sections (5a) which run in the form of baseless isosceles trapezoids oriented in a consistent manner with respect to the longitudinal extension direction (ER) or in the form of arcs oriented in a consistent manner with respect to the longitudinal extension direction (ER), wherein on that side of the hatched ribs (5),at which a hatched rib base line (bSR) running along the trapezoidal bases or along the bow chords of the arches is located, two freely ending additional ribs (6) branch off from each rib section (5a).

2. Vehicle tire (1) according to claim 1, characterized in that the additional ribs (6) branching off from the same rib section (5a), viewed in plan view, extend in a V-shape to one another and are inclined in opposite directions to one another with respect to the longitudinal extension direction (ER) of the hatched rib (5) and approach one another in the direction of the hatched rib (5).

3. Vehicle tire (1) according to claim 2, characterized in that the additional ribs (6) branching off from the same rib section (5a) are in, 202202018 Viewed from above, are inclined in a consistent manner relative to the longitudinal direction (ER) of the hatched rib (5).

4. Pneumatic vehicle tire according to claim 2 or 3, characterized in that the additional ribs (6), which extend in a V-shape relative to one another, enclose an angle (β) of 15° to 25°, in particular of 18° to 22°.

5. Vehicle tire according to one of claims 1 to 4, characterized in that the additional ribs (6), which branch off from the same rib section (5a), adjoin the respective hatched rib (5) at a mutual distance.Vehicle tire according to one of claims 1 to 5, characterized in that the additional ribs (6), viewed in plan view, pass the hatched rib base line (bSR), wherein the additional ribs (6), viewed in plan view, preferably each have a first additional rib section (6a) extending from the hatched rib base line (bSR) to the hatched rib (5) and a second additional rib section (6b) adjoining the first additional rib section and longer than the first additional rib section (6a).

7. Vehicle tire according to one of claims 1 to 6, characterized in that the additional ribs (6) have a width that continuously decreases towards the hatched rib (5). 8.Vehicle tire (1) according to one of claims 1 to 7, characterized in that the rib sections (5a) run in the form of baseless isosceles trapezoids, so that each rib section (5a) is composed of a rib section part (5a1) forming the short base side of the trapezoid and two rib section parts (5a2) each forming a trapezoid leg, wherein the one additional rib (6) extends from the mutual connection region of the rib section part (5a1) forming the short base side of the trapezoid to the rib section part (5a2) forming one trapezoid leg and the other additional rib (6). 202202018 from the mutual connection area of ​​the rib section part (5a1) forming the short base side of the trapezoid to the rib section part (5a2) forming the other trapezoid leg.

9. Pneumatic vehicle tire according to one of claims 1 to 8, characterized in that the additional ribs (6) each have an extension length (eZ) of 0.30 mm to 0.50 mm, in particular of 0.35 mm to 0.45 mm.

10. Vehicle tire according to one of claims 1 to 9, characterized in that the rib sections (5a) of all hatched ribs (5) are oriented consistently with respect to the longitudinal extension direction (ER) and thus point in a corresponding direction with respect to the longitudinal extension direction (ER).Vehicle tire according to one of claims 1 to 10, characterized in that hatched ribs (5) extending adjacent to one another have a mutual spacing (aR) of at least 0.50 mm and in particular of up to 0.80 mm, relative to the hatched rib base lines (bSR) and determined perpendicularly thereto.

12. Vehicle tire according to one of claims 1 to 11, characterized in that hatched ribs (5) extending directly adjacent to one another are offset from one another in their longitudinal direction (ER). 13.Vehicle tire according to claim 2 and claim 12, characterized in that the hatched ribs (5), which run directly next to one another, are offset from one another in their longitudinal direction (ER) in such a way that, viewed in plan view, - for each central hatched rib (5) having two adjacent hatched ribs (5), the additional ribs (6) forming one V-leg and running parallel to one another run in alignment with the corresponding additional ribs (6) from the one adjacent hatched rib (5) and those forming the other V-legs run parallel to one another. 202202018 extending additional ribs (6) are aligned with the corresponding additional ribs (6) from the other adjacent hatched rib (5) and - for each edge-side hatched rib (5) having an adjacent hatched rib (5), only the additional ribs (6) forming a V-leg and running parallel to one another are aligned with the corresponding additional ribs (6) from the adjacent hatched rib (5). 14.Vehicle tire according to one of claims 1 to 13, characterized in that between the additional ribs (6) branching off from the same rib section (5a), a free-standing, peg-shaped elevation (10) is formed, which has a maximum height (hE) of 0.05 mm to 0.80 mm, in particular of 0.10 mm to 0.50 mm, wherein the maximum height (hE) of the peg-shaped elevation (10) is preferably smaller than the maximum height (hZ) of the additional ribs (6) and / or wherein the maximum height (hE) of the peg-shaped elevation (10) is preferably smaller than the maximum height (hSR) of the hatched ribs (5). 15.Vulcanization mold for the shaping vulcanization of a vehicle tire (1) according to one or of claims 1 to 14, wherein the vulcanization mold has at least one molding surface which has a negative contour of a hatched surface (4) with elongated hatched ribs (5) running alongside one another with longitudinal extension directions (ER) running parallel to one another or largely parallel to one another, characterized in that the negative contour has the following: - first depressions for forming hatched ribs (5), which, viewed in plan view, each run in a regular wave shape and are each composed of adjoining rib sections (5a) which are in the form of baseless isosceles trapezoids oriented in the same way with respect to the longitudinal extension direction (ER) or in. 202202018 form of arches oriented in the same direction of longitudinal extension (ER), and - second depressions for forming two freely ending additional ribs (6) branching off from each rib section (5a) on that side of the hatched ribs (5) on which a hatched rib base line (bSR) running along the trapezoidal bases or along the bow chords of the arches is located.

16. A method for producing a vehicle tire (1) according to one of claims 1 to 14, wherein the method comprises the following steps: a) engraving a negative contour for forming a hatched surface (4) into a mold surface of a vulcanization mold for the formative vulcanization of a vehicle tire (1) by means of laser engraving, wherein the negative contour has the following: - first depressions for forming hatched ribs (5), which, viewed in plan view,each extend in a regular wave shape and are each composed of adjoining rib sections (5a) which extend in the form of baseless isosceles trapezoids oriented consistently with respect to the longitudinal direction (ER) or in the form of arcs oriented consistently with respect to the longitudinal direction (ER), and - second recesses for forming two freely ending additional ribs (6) branching off from each rib section (5a) on that side of the hatched ribs (5) on which a hatched rib base line (bSR) running along the trapezoid bases or along the bow chords of the arcs is located, b) shaping vulcanization of a green tire by means of the vulcanization mold, whereby a hatched surface (4) with hatched ribs (5) and additional ribs (6) is embossed into an outer surface of the vehicle tire, in particular a sidewall and / or the tread of the vehicle tire.

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