Vehicle tire

Abstract

The invention relates to a vehicle tyre (1), in particular a pneumatic vehicle tyre, having a side wall (2) and a tread (3) and at least one shadow region (4) on at least one of the side wall (2) and / or the tread (3), the shadow region (4) having shadow ribs (5) extending side by side and having an elongated design, the shadow ribs have longitudinal extension directions (ER) which run parallel to each other or substantially parallel to each other. The shadow ribs (5), viewed in a top view, each extend in a regular waveform and each consist of rib sections (5a) which are connected to one another and which extend in the form of a bottomless isosceles trapezoid, the orientation of which coincides with the longitudinal extension direction (ER); the invention relates to a shadow rib (5) comprising a plurality of rib sections (5a) extending in the form of a trapezoid or in the form of a circular arc, the orientation of which coincides with the longitudinal extension direction (ER), two additional ribs (6) having free ends being equally divided from each rib section (5a) on the side of the shadow rib (5) on which a shadow rib base line (bSR) extending along the trapezoid base or along the arc chord of the circular arc is located.

Description

Technical Field

[0001] The present invention relates to a vehicle tire, in particular a vehicle pneumatic tire, which has: a sidewall and a tread and at least one shadow area located on at least one of the sidewalls and / or the tread, wherein the shadow area has shadow ribs extending side by side and having an elongated design, and these shadow ribs have longitudinal extension directions extending parallel to each other or largely parallel to each other. Background Art

[0002] During the vulcanization of the tire, the shadow area is usually embossed onto the outside of the tire by forming a vulcanization mold with a concave contour of the relevant shadow area on the mold surface. On an already vulcanized tire, the shadow area or the surface elements that form the structured shadow area can be produced by ablation, engraving or additive methods.

[0003] The main purpose of the shaded area formed on the sidewall or shoulder edge of a vehicle tire is to contrast with the existing smooth surface area on the sidewall or shoulder edge of the vehicle tire, with particular attention paid to good visibility and recognizability, for example in order to visually emphasize characters, graphic elements, company logos, other identifiers, etc. on the sidewall. The same applies to the shaded area on the groove edge of the groove in the tread. In this case, the shaded area can be part of the characters, picture elements, graphic elements, company logos, other identifiers, or can also completely or partially surround or enclose them. The shaded area can also be used to cover up design-related unevenness on the sidewall.

[0004] Vehicle tires of the type mentioned in the introduction are known, for example, from EP 2 502 758 A1 and DE 10 2008 010 486 A1, whose sidewalls have a hatching region with hatching ribs running alongside one another.

[0005] The scattering of light at the side edges of the shadow ribs reduces the degree of reflection of light on the tire surface, thereby changing the brightness effect of the shadow area, and the shadow area usually appears darker than a substantially smooth surface area without a shadow area. In particular, although the shadow area consisting of shadow ribs extending parallel to each other can be well engraved as a concave contour into the mold surface of a vulcanization mold for forming and vulcanizing a vehicle tire (for example, by laser engraving) and then stamped into the rubber material with high quality during the tire vulcanization process, their contrast effect is heavily dependent on the incident direction of light. Therefore, at certain viewing angles, the contrast may suddenly decrease. Summary of the invention

[0006] The invention is therefore based on the object of influencing in a targeted manner, in particular increasing, the contrast effect of the shadow region(s) with shadow ribs in a vehicle tire of the type mentioned in the introduction under all lighting conditions and light incidence angles and in this case simultaneously finding a satisfactory compromise between improved contrast effect and efficient producibility for the tire vulcanization mold.

[0007] 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 .

[0008] The vehicle tire according to the present invention is characterized in that: when observed in a top view, the shaded ribs extend in a regular waveform and are respectively composed of rib segments connected to each other, which extend in the form of a bottomless isosceles trapezoid, the orientation of which is consistent with the longitudinal extension direction; or the rib segments extend in the form of an arc, the orientation of which is consistent with the longitudinal extension direction, wherein on the side of the shaded rib where the base line of the shaded rib extending along the base of the trapezoid or along the chord of the arc is located, two additional ribs with free ends branch out from each rib segment.

[0009] The shadow ribs extending in a wave-like manner according to the invention together with the additional ribs provide a plurality of rib side edges extending in different directions, on which light incident from all possible directions is scattered, reflected multiple times and absorbed, thereby achieving a particularly high contrast effect. As a result, the shadow area appears particularly dark and the contrast is very clear at all viewing angles. In addition, a shadow effect occurs, which, in particular on the black rubber of vehicle tires, helps to clearly highlight the shadow area.

[0010] The contrast measurement of this side using an integrating sphere demonstrates the excellent contrast effect of the shadow area. Here, the contrast value is determined, which is derived from the ratio of the measured black value of the shadow area to the measured black value of the surrounding smooth area. In the case of the shadow area implemented according to the invention, a contrast value of about 2.7 was determined. In contrast, the contrast value of the conventional standard shadow area, which originates from the concave contour milled into the mold surface of the vulcanization mold, is about 1.3 to 1.5.

[0011] The preferred first embodiment is characterized in that, viewed in a plan view, the additional ribs branching from the same rib section extend in a V-shape relative to each other and extend in a manner inclined in opposite directions relative to the longitudinal extension direction of the shadow rib, and approach each other in the direction toward the shadow rib. Therefore, the contrast effect of the shadow rib can be further improved without being affected by the incident direction of light at all viewing angles.

[0012] In this preferred embodiment, it is advantageous if, viewed in plan view, the additional ribs branching off from the same rib section are inclined in a manner consistent with the longitudinal extension direction of the shadow ribs, which further improves the light scattering of the shadow ribs.

[0013] Furthermore, in this preferred embodiment, it is advantageous if the additional ribs extending in a V-shape relative to one another enclose an angle of 15° to 25°, in particular 18° to 22°. This ensures that the additional ribs have a particularly advantageous "density" with regard to light scattering at the additional ribs.

[0014] Another preferred embodiment is characterized in that the additional ribs branching off from the same rib section are connected to the corresponding shadow ribs at a certain mutual distance. This helps to further increase the contrast value of the shadow area.

[0015] According to another preferred embodiment, the additional ribs, viewed in plan view, pass through the shadow rib base line, wherein, viewed in plan view, the additional ribs preferably each have a first additional rib section extending from the shadow rib base line to the shadow rib and a second additional rib section connected to the first additional rib section and embodied longer than the first additional rib section. The additional ribs thus protrude significantly beyond the shadow ribs, which is also beneficial to the contrast value.

[0016] The width of the additional ribs is preferably continuously reduced relative to the shadow ribs. Thus, during the tire vulcanization process, the interconnection area of ​​each additional rib and the shadow rib is shaped in a particularly detailed and precise manner, thereby further improving the contrast effect.

[0017] Another preferred embodiment is characterized in that the rib segments extend in the form of a bottomless isosceles trapezoid, so that each rib segment consists of a rib segment portion forming the short base of the trapezoid and two rib segment portions each forming a trapezoid waist, one additional rib protruding from the interconnection region of the rib segment portion forming the short base of the trapezoid and the rib segment portion forming one trapezoid waist, and the other additional rib protruding from the interconnection region of the rib segment portion forming the short base of the trapezoid and the rib segment portion forming the other trapezoid waist. In this embodiment, the interconnection region of each additional rib with the shadow rib is also shaped in a particularly delicate and precise manner during the tire vulcanization process. The contrast effect is thus further improved.

[0018] According to a further preferred embodiment, the additional ribs each have an extension of 0.30 mm to 0.50 mm, in particular 0.35 mm to 0.45 mm.

[0019] Furthermore, it is advantageous for the contrast effect if the rib sections of all shadow ribs are oriented in a consistent manner relative to the longitudinal extension direction and thus point in consistent directions relative to the longitudinal extension direction. This allows the shadow ribs to be arranged with a particularly high density and at the same time also to be formed in great detail.

[0020] A further preferred embodiment is characterized in that the shadow ribs extending adjacent to one another have a mutual spacing relative to one another, measured with respect to the shadow rib base line and perpendicularly thereto, of at least 0.50 mm, in particular of a maximum of 0.80 mm.

[0021] An equally preferred embodiment, by which the contrast effect is further improved, is characterized in that the shadow ribs extending next to one another are offset relative to one another in the direction of their longitudinal extension.

[0022] In a particularly preferred variant, the preferred first embodiment is combined with the preferred last-mentioned embodiment in that the shadow ribs extending next to one another are offset relative to one another in their longitudinal extension direction in such a way that: in each case, when viewed in plan view,

[0023] - in the case of each central shadow rib having two adjacently extending shadow ribs, the additional ribs extending parallel to one another forming one V-leg extend flush with the corresponding additional rib from one adjacent shadow rib, while the additional ribs extending parallel to one another forming the other V-leg extend flush with the corresponding additional rib from the other adjacent shadow rib; and

[0024] In the case of each lateral shading rib having an adjacent shading rib, only the additional ribs extending parallel to one another, which form a V-leg, extend flush with the corresponding additional rib from the adjacent shading rib.

[0025] Another preferred embodiment is characterized in that a separate plug-shaped protrusion is respectively provided between the additional ribs branching off from the same rib section, the maximum height of which is 0.05 mm to 0.80 mm, in particular a maximum of 0.10 mm to 0.50 mm, wherein the maximum height of the plug-shaped protrusion is preferably smaller than the maximum height of the additional ribs and / or wherein the maximum height of the plug-shaped protrusion is preferably smaller than the maximum height of the shadow ribs. The plug-shaped protrusions thus occupy corresponding free space in the region between the additional ribs, whereby the contrast effect is likewise improved.

[0026] The invention also relates to a vulcanization mold for the form-vulcanization of a vehicle tire according to one or more of claims 1 to 14, wherein the vulcanization mold has at least one mold surface with a concave contour of a shadow region with shadow ribs extending side by side and of elongated design, which have a longitudinal extension direction extending parallel to one another or to a large extent parallel to one another, wherein

[0027] Concave profiles have the following items:

[0028] - first depressions for forming shadow ribs, which, when viewed in a plan view, extend in a regular wave shape and are composed of rib segments connected to each other, which extend in the form of a bottomless isosceles trapezoid, the orientation of which is consistent with the longitudinal extension direction; or which extend in the form of a circular arc, the orientation of which is consistent with the longitudinal extension direction; and

[0029] A second recess for forming two additional ribs branching from each rib segment with free ends on that side of the shadow rib where the shadow rib base line extends along the trapezoidal base or along the chord of the circular arc is located.

[0030] The invention also relates to a method for producing a vehicle tire according to one of claims 1 to 14, wherein the method comprises the following steps:

[0031] a) engraving a concave profile for forming a shadow area into a mold surface of a vulcanization mold for form vulcanizing a vehicle tire by laser engraving, wherein the concave profile has the following items:

[0032] - first depressions for forming shadow ribs, which, when viewed in a plan view, extend in a regular wave shape and are composed of rib segments connected to each other, which extend in the form of a bottomless isosceles trapezoid, the orientation of which is consistent with the longitudinal extension direction; or which extend in the form of a circular arc, the orientation of which is consistent with the longitudinal extension direction; and

[0033] - a second recess for forming two additional ribs branching from each rib segment and having free ends on the side of the shadow rib where the shadow rib base line extending along the trapezoidal base or along the chord of the arc of a circle is located;

[0034] b) Form-curing the tire blank by means of a vulcanization mold, whereby the shadow area with the shadow ribs and the additional ribs is impressed onto the outer surface of the vehicle tire, in particular onto the sidewall and / or the tread of the vehicle tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Now, further features, advantages and details of the present invention will be described in detail with the aid of the accompanying drawings which schematically show embodiments of the present invention. In the drawings:

[0036] Figure 1 showing a view of a vehicle tire with shaded areas;

[0037] Figure 2 A schematic enlarged top view of a detail of a shaded area of ​​a first embodiment variant of the present invention is shown, wherein a longitudinal section of the shaded rib can be seen;

[0038] Figure 3 Show Figure 2 A schematic oblique view of a local part of;

[0039] Figure 4 Show Figure 2 A schematic oblique view of a partial portion of a device, wherein the oblique view is based on a scan created using an electron microscope;

[0040] Figure 4a Shown with Figure 4 relevant, scanned photographic images,

[0041] Figure 4b Show Figure 4a A top view of a portion of a scanned image,

[0042] Figure 5 Shown along Figure 4 , Figure 4a and Figure 4b A cross section of a VV line, wherein the cross section is based on a scan;

[0043] Figure 6 A schematic enlarged top view of a detail of a shaded area of ​​a second embodiment variant of the present invention is shown, wherein a longitudinal section of the shaded rib can be seen;

[0044] Figure 7 Show Figure 6 an oblique view of a partial portion of the device, wherein the oblique view is based on a scan created using an electron microscope; and

[0045] Figure 7a Shown with Figure 7 Related, scanned photographic images.

[0046] List of Reference Numerals

[0047] 1...................Vehicle tires

[0048] 2...................Side wall

[0049] 3...................Tread

[0050] 4, 4'...............Shadow area

[0051] 5...................Shadow Rib

[0052] 5a..................Rib section

[0053] 5a1................................. Rib section

[0054] 5a2.................rib section

[0055] 5b.............Inner corner area

[0056] 5c.............Outer corner area

[0057] 6...................Additional ribs

[0058] 6a..................Additional rib section

[0059] 6b.................Additional rib section

[0060] 7...................Shadow bottom

[0061] 8a..................Tip area

[0062] 8b..................Costral margin

[0063] 9a..................Tip area

[0064] 9b..................Costral margin

[0065] 9c..................End face side edge

[0066] 10..................Bump

[0067] a...................Maximum deflection

[0068] a SR , a Z ..............spacing

[0069] b SR ..................Shadow rib baseline

[0070] e a , e a1 , e a2 , e Z .......Extended length

[0071] E R ..................Vertical extension direction

[0072] h E ,h SR ,h Z ...........Maximum height

[0073] h1, h2, h4, h5........maximum height

[0074] h2*, h3*, h5*........Maximum height

[0075] M i,i＝1至5 .............Measurement point

[0076] m SR ..................Shadow rib centerline

[0077] m Z ..................Rib centerline

[0078] α.............Internal angle

[0079] β, γ..............angle DETAILED DESCRIPTION

[0080] Figure 1 A circumferential section of a vehicle tire 1 is shown, the vehicle tire having a sidewall 2, a tread 3 and a shaded area 4 located on the outer side of the sidewall 2 and (as shown) on the tread 3. The vehicle tire is preferably a vehicle pneumatic tire, in particular for a passenger car, a van, an SUV, a light truck, a commercial vehicle, a motorcycle, a bus or a bicycle. The shaded area 4 is a surface element, which is implemented in any external form, for example as a graphic configuration, a trademark or a character. The shaded area 4 can also be formed on the groove side edge and / or the groove bottom of the groove formed in the tread 3, or at the tread roll-out, i.e. on the shoulder side edge extending toward the sidewall outside the ground contact surface on the shoulder side.

[0081] like Figure 2 and Figure 3 As shown, the shaded area 4 has elongated shaded ribs 5 extending side by side, which have a longitudinal extension direction E R ( Figure 2 ), where in the top view ( Figure 2 ) is observed, the shadow rib 5 extends in a regular wave shape. In the embodiment shown, the longitudinal extension direction E R It is a straight line, but preferably can also extend in an arc or wave-shaped manner as a whole.

[0082] The following will first describe the ideal shape of the shadow area 4 and the shadow ribs 5 included therein (eg Figure 2 and Figure 3 ), and then discuss the difference between the shape of the shaded area 4 and the shape that actually exists on the vehicle tire (as shown in FIG. Figure 4 , Figure 4a , Figure 4b , Figure 5 shown).

[0083] according to Figure 2 The shadow ribs 5 have a longitudinal extension direction E R Extended shadow rib baseline b SR , the maximum deflection a of the waveform is determined relative to the shadow rib baseline, which corresponds to twice the waveform amplitude. In addition, the shadow ribs 5 each have a shadow rib center line m that follows their course in the top view. SR , and are respectively composed of rib segments 5a connected to each other, which extend in the form of a bottomless isosceles trapezoid when viewed in a plan view, and the orientation of the bottomless isosceles trapezoid is in the longitudinal extension direction E R In this embodiment, the rib segments 5a of all shadow ribs 5 are aligned with respect to the longitudinal extension direction E. R oriented in a consistent manner, so that relative to the longitudinal extension direction E R Pointing in the same direction. Baseline b of the shaded rib SR Extend along the missing base of the trapezoid and coincide with the centerline of the shaded rib m SR Therefore, the rib segment 5a can be connected along the longitudinal extension direction E R Each rib segment 5a is composed of a rib segment portion 5a1 and two rib segment portions 5a2, which form the short base of the trapezoid and are straight in a top view and extend in the longitudinal direction E. R Extension; the two rib segment parts each form a trapezoidal waist and extend in a straight line in a top view.

[0084] Due to the direction of the shaded rib 5, the rib segment parts 5a2 connected to each other and belonging to the rib segment 5a, forming the trapezoidal waist, respectively form an inner angle area 5b and an acute outer angle area 5c at their mutual connection, wherein the rib segment parts 5a2 surround each other at the inner angle area 5b about the center line m of the shaded rib. SRAn internal angle α of 80° to 120°, in particular 85° to 110°, preferably a maximum of 95°.

[0085] The rib segment portion 5a is about the shaded rib base line b SR The extension length e a The rib segments 5a1 have a diameter along the shaded rib center line m. SR The measured extension length e a1 (rib segment 5a1), e a2 (rib segment 5a2), wherein the extension length e a1 Preferably 0.15 mm to 0.40 mm, in particular a maximum of 0.30 mm, preferably 0.20 mm to 0.25 mm, and preferably adapted to the inner angle α in such a way that the extension length e a2 With the extension length e a1 The maximum difference is 0.05mm.

[0086] like Figure 2 and Figure 3 As shown, at each shadow rib 5, the shadow rib baseline b SR ( Figure 2 ) is located on the side from each rib segment 5a ( Figure 2 ) each branch out into two additional ribs 6, which extend in a straight line and in a V-shape relative to each other in a top view, passing through the shadow rib base line b SR ( Figure 2 ) and has free ends, wherein one additional rib 6 projects from the mutual connection region of the rib segment part 5a1 and the rib segment part 5a2 forming one trapezoidal waist, and one additional rib 6 projects from the mutual connection region of the rib segment part 5a1 and the rib segment part 5a2 forming the other trapezoidal waist. In the case of a V-shape, the V-shaped tip is thus replaced by the rib segment part 5a1, which extends between the respective additional ribs 6 extending in a V-shape relative to each other. Figure 2 The additional rib 6 and the rib section 5a extend along the longitudinal direction E. R The additional rib 6 has a parallel displacement and is mapped to each other, wherein the additional rib 6 has: a longitudinal axis m extending along the direction of the additional rib 6 and extending to the center line m of the shadow rib. SR Rib centerline m Z ; Along the rib centerline m Z The measured extension length e Z , the extension length is 0.30mm to 0.50mm, especially 0.35mm to 0.45mm; and the continuous reduction relative to the shadow rib 5, perpendicular to the rib center line m in the top view ZThe additional ribs 6 branching off from the same rib section 5a extend in the longitudinal direction E R The additional ribs extend in opposite directions in such a way that between the additional ribs in the longitudinal extension direction E R Measured relative to the rib centerline m Z The mutual distance a Z As the distance from the rib segment 5a1 increases, the additional ribs continue to increase, and these additional ribs surround each other about the rib center line m Z Preferably, the additional rib 6 is oriented in a plan view relative to the longitudinal extension direction E. R The additional ribs 6 are inclined with a consistent strength (at a consistent large angle). When viewed from above, the additional ribs 6 each have a base line b of the shaded rib. SR A first additional rib section 6 a which extends to the shadow rib 5 and a second additional rib section 6 b which is connected to the first additional rib section and is longer than the first additional rib section 6 a .

[0087] Therefore, in each shaded rib 5, the additional ribs 6 include additional ribs 6 extending parallel to each other in a top view and additional ribs 6 extending parallel to each other with respect to the longitudinal extension direction E of these additional ribs 6. R Additional ribs 6 which are inclined in opposite directions and which likewise extend parallel to one another in top view.

[0088] If the extension length e a1 、e a2 If they are consistent, the extension length e Z Particularly preferably, the extension length e a1 、e a2 At least 0.10mm larger.

[0089] If the extension length e a1 With the extension length e a2 Different, the extension length e Z Particularly preferably, the two extension lengths e a1 、e a2 The larger extension length is at least 0.10 mm.

[0090] The shadow ribs 5 extending side by side in the shadow area 4 are arranged in the longitudinal extension direction E. RSuch an offset is preferably implemented in the following way: when viewed in a top view, in the case of each central shadow rib 5 having two adjacently extending shadow ribs 5, the additional ribs 6 extending parallel to each other extend flush with the corresponding additional ribs 6 from one adjacent shadow rib 5, while the other additional ribs 6 extending parallel to each other extend flush with the corresponding additional ribs 6 from the other adjacent shadow rib 5. Correspondingly, in the case of each side shadow rib 5, only the additional ribs 6 extending parallel to each other extend flush with the corresponding additional ribs 6 from the adjacent shadow rib 5.

[0091] The shadow ribs 5 adjacent to each other have a distance with respect to the shadow rib base line b. SR The mutual spacing a is measured perpendicular to the base line of the shadow rib SR It is at least 0.50 mm, in particular at most 0.80 mm.

[0092] according to Figure 3 The shadow rib 5 is preferably located on the shadow bottom 7, which is, for example, on the tire sidewall 2 ( Figure 1 ). Thus, the shadow rib 5 is a protrusion extending from the shadow bottom 7 (i.e., formed on it) and has an approximately trapezoidal, triangular or approximately triangular cross section with a tip region 8a and two rib side edges 8b that are inclined downward in the direction of the shadow bottom 7, which extend at an acute angle γ of up to 10°, in particular 2° to 10°, preferably 3° to 5°, relative to the vertical line to the shadow bottom 7 and transition into the shadow bottom 7 via a bend or rounded portion. In addition, the maximum height h of the shadow rib 5, measured perpendicularly to the shadow bottom 7, is SR (The height of the highest point) is 0.10mm to 0.80mm, preferably 0.20mm to 0.50mm, and particularly preferably 0.25mm to 0.35mm. The tip area 8a is designed as a platform portion, the width of which is 0.05mm to 0.10mm and extends continuously over the entire shadow rib 5. In another alternative embodiment, the tip area 8a is a rounded portion between the upper ends of the rib side edges 8b.

[0093] The additional rib 6 has an approximately trapezoidal, triangular or approximately triangular cross section corresponding to the shadow rib 5, comprising a tip region 9a and rib side edges 9b which likewise enclose the mentioned angle γ (not shown) with the perpendicular to the shadow base 7 and merge into the shadow base 7 via a bend or rounding. The additional rib 6 has a maximum height h measured perpendicular to the shadow base 7. Z , which is equal to the maximum height h of the shadow rib 5 SRThe additional rib 6 has at its free end a face side edge 9c which, in the embodiment shown, is a largely flat surface which is a surface which slopes downwards in the direction of the shadow bottom 7 at an angle of at most 5° measured relative to a reference line perpendicular to the shadow bottom 7, or perpendicular to the shadow bottom 7 and preferably substantially in the extension direction E. R Extending in parallel (see Figure 1 ) In an alternative embodiment not shown, the end face side edge 9c is designed as a whole as a rounded portion between the rib side edges 9b.

[0094] Figure 4 A schematic oblique view showing the shaded area 4, Figure 4a An oblique view of a scan created using an electron microscope showing the shaded area 4, and Figure 4b Show Figure 4a Top view of a portion of the scan. Figure 5 Shown along Figure 4 , Figure 4a and Figure 4b The section of line VV in .

[0095] and Figure 2 and Figure 3 Compared with the ideal shape of the shadow area 4 shown, the shadow area 4 actually existing on the tire (such as Figure 4 , Figure 4a and Figure 4b The feature of the shadow bottom 7 is that it extends over the entire shadow area 4, and this irregularity is caused by the manufacturing method, which will be discussed below. Here, the shadow bottom 7 has an irregular roughness ( Figure 4a , Figure 4b , Figure 5 ), and the rib side edges 8b, 9b and the end face side edges 9c each have irregular slight undulations. Therefore, the rib side edges 8b, 9b and the end face side edges 9c are generally flat, non-structured surfaces. In addition, the tip areas 8a, 9a ( Figure 4 , Figure 4a ) is characterized by irregular height changes and extremely small changes, so the maximum height h SR 、h Z ( Figure 3 ) will be affected by certain fluctuations.

[0096] Figure 4b and Figure 5 Multiple measuring points M are marked i,i＝1至5 At these measuring points, the maximum height measured perpendicularly to the shadow bottom 7 is determined in each case.

[0097] like Figure 5 As shown, in the cross section shown, in the tip region 8a, 9a ( Figure 4 ) at a different maximum height relative to the adjacent corresponding lowest level of the shadow bottom 7. Figure 5 The maximum height measured relative to the lowest level of the shadow bottom 7 present on the left is expressed as * The maximum heights measured in the cross section shown are as follows:

[0098] h1=0.276mm

[0099] h2=0.293mm

[0100] h2 * =0.291mm

[0101] h3 * =0.270mm

[0102] h4=0.283mm

[0103] h5=0.288mm

[0104] h5 * =0.268mm

[0105] Irregularities caused by the manufacturing process cause the "constant" maximum height to vary within an interval of up to 0.03 mm.

[0106] Figure 6 and Figure 7 A detail of a shaded area 4' is shown, which is a variant of the shaded area 4. The shaded area 4' differs from the shaded area 4 in that in the area of ​​each shaded rib 5, between the additional ribs 6 extending in a V-shape relative to each other, there is respectively provided a dot-shaped, independent and overall plug-shaped protrusion 10 in a top view. The maximum height h of the plug-shaped protrusion 10 is E ( Figure 7 ) is 0.05 mm to 0.80 mm, in particular 0.10 mm to a maximum of 0.50 mm, wherein the maximum height h E Preferably less than the maximum height h of the additional rib 6 Z ( Figure 3 ) and is smaller than the maximum height h of the shadow rib 5 SR ( Figure 3 ). Figure 7a An oblique view of a scan created using an electron microscope showing the shaded area 4'.

[0107] A method for manufacturing a pneumatic tire for a vehicle with a shaded area 4 will be discussed below.

[0108] During the shaping vulcanization of the vehicle tire 1, a shadow area 4 is produced on the surface of the vehicle tire 1, for example on the sidewall 2. For this purpose, a vulcanization mold is used having a mold surface which contains the concave contour of the shadow area 4 to be generated.

[0109] The method for manufacturing a vehicle tire 1 comprises the following steps:

[0110] a) engraving a concave profile for forming the shadow area 4 into a mold surface of a vulcanization mold for form-vulcanizing the vehicle tire 1 by laser engraving,

[0111] wherein the concave profile has a first depression for forming the shadow rib 5 and a second depression for forming the additional rib 6,

[0112] b) Form-curing the tire blank by means of a vulcanization mold, whereby the shadow area 4 with the shadow ribs 5 and the additional ribs 6 is impressed onto the outer surface of the vehicle tire, in particular onto the sidewall and / or the tread of the vehicle tire.

[0113] The invention is not restricted to the described exemplary embodiments.

[0114] The shadow ribs of the shadow area extending side by side can also extend without offset or arbitrarily in the longitudinal extension direction E. R In the top view, the rib section of the shaded rib can also extend in the form of an arc (thus extending in the shape of a circular arc), the orientation of the arc being in the longitudinal extension direction E R Accordingly, two additional ribs with free ends branch off from each rib section on the side of the shaded rib where the shaded rib base line extending along the arc chord of the circular arc is located.

[0115] The cross-sectional shape of the shadow ribs and the additional ribs may differ from the cross-sectional shape described. The shadow ribs and the additional ribs preferably have a cross-sectional shape which is symmetrical with respect to a perpendicular to the shadow base. The rib side edge can be convexly or concavely curved as a whole or at least over a large part of its extension, wherein the transition to the shadow base is achieved by a bend or a rounded portion and wherein the angle β mentioned lies between the straight lines connecting the end points of the curved rib side edge. Furthermore, the rib side edge can be embodied in a stepped manner, wherein the angle β is measured between the straight lines connecting the two ends of the rib side edge. Furthermore, the rib side edge can be structured, i.e. the rib side edge can be provided with a surface structure (e.g. roughness) so that the rib side edge has a minimal structure.

[0116] The shadow ribs may extend substantially parallel to one another in a top view (with respect to their longitudinal extension direction), wherein “the shadow ribs extend substantially parallel to one another” should be understood as extending directions differing by a maximum of 5° from one another.

[0117] In addition, the shadow ribs may extend in an arc shape in a top view (relative to their longitudinal extension direction). In the case where the shadow ribs are substantially parallel to each other and extend in an arc shape respectively, the angle at which the extension directions of the shadow ribs can differ from each other is the same as the angle applied to the corresponding shadow rib baseline b. SR , are related to tangents that extend parallel to each other.

Claims

1. A vehicle tire (1), in particular a pneumatic vehicle tire, comprising: a sidewall (2) and a tread (3) and at least one shaded area (4) located on at least one of the sidewall (2) and / or the tread (3), wherein the shaded area (4) has elongated shaded ribs (5) extending side by side and having longitudinal extension directions (E) extending parallel to one another or largely parallel to one another. R ), It is characterized in that When viewed from above, the shadow ribs (5) extend in a regular wave shape and are each composed of rib segments (5a) connected to each other, wherein the rib segments extend in the form of a bottomless isosceles trapezoid, and the orientation of the bottomless isosceles trapezoid is parallel to the longitudinal extension direction (E R ) is consistent; or the rib segment extends in the form of an arc, the orientation of the arc is consistent with the longitudinal extension direction (E R ), wherein the shadow rib baseline (b ) of the shadow rib (5) extending along the trapezoidal base or along the arc chord of the arc SR ) is located, two additional ribs (6) with free ends branch off from each rib segment (5a).

2. The vehicle tire (1) according to claim 1, characterized in that When viewed in plan view, the additional ribs (6) branching off from the same rib section (5a) extend in a V-shape relative to one another and relative to the longitudinal extension direction (E) of the shadow rib (5). R ) extend in opposite directions and approach each other in the direction of the shadow rib (5).

3. The vehicle tire (1) according to claim 2, characterized in that When viewed from above, the additional rib (6) branching off from the same rib section (5a) extends in a longitudinal direction (E) relative to the shadow rib (5). R ) in a manner consistent with the above.

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

5. The vehicle tire according to any one of claims 1 to 4, characterized in that The additional ribs (6) branching off from the same rib section (5a) are connected to the corresponding shadow rib (5) at a certain distance from each other.

6. The vehicle tire according to any one of claims 1 to 5, characterized in that When viewed from above, the additional rib (6) passes through the shaded rib base line (b SR ), wherein, when viewed in plan view, the additional ribs (6) preferably have a base line (b SR ) extends to the shadow rib (5) and a second additional rib section (6b) connected to the first additional rib section and longer than the first additional rib section (6a).

7. The vehicle tire according to any one of claims 1 to 6, characterized in that The width of the additional rib (6) decreases continuously relative to the shadow rib (5).

8. The vehicle tire (1) according to any one of claims 1 to 7, characterized in that The rib segment (5a) extends in the form of a bottomless isosceles trapezoid, so that each rib segment (5a) is composed of a rib segment part (5a1) forming the short base of the trapezoid and two rib segment parts (5a2) each forming a trapezoidal waist, wherein one additional rib (6) extends from the interconnection area between the rib segment part (5a1) forming the short base of the trapezoid and the rib segment part (5a2) forming one trapezoidal waist, and the other additional rib (6) extends from the interconnection area between the rib segment part (5a1) forming the short base of the trapezoid and the rib segment part (5a2) forming another trapezoidal waist.

9. The vehicle pneumatic tire according to any one of claims 1 to 8, characterized in that: The additional ribs (6) each have an extension (e) of 0.30 mm to 0.50 mm, in particular 0.35 mm to 0.45 mm. Z ).

10. The vehicle tire according to any one of claims 1 to 9, characterized in that The rib segments (5a) of all the shadow ribs (5) are arranged in a direction relative to the longitudinal extension direction (E R ) are oriented in a manner consistent with the longitudinal extension direction (E R ) point in the same direction.

11. The vehicle tire according to any one of claims 1 to 10, characterized in that The shadow ribs (5) extending adjacent to each other have a relative position with respect to the shadow rib base line (b SR ) and the mutual spacing (a) measured perpendicular to the baseline of the shadow rib R ) is at least 0.50 mm, in particular at most 0.80 mm.

12. The vehicle tire according to any one of claims 1 to 11, characterized in that The shadow ribs (5) extending adjacent to each other are arranged in the longitudinal direction (E R ) are offset relative to each other.

13. The vehicle tire according to claim 2 and claim 12, characterized in that The shadow ribs (5) extending adjacent to each other are arranged in the longitudinal direction (E R ) are offset relative to each other so that: when viewed in a top view, - in the case of each central shadow rib (5) having two adjacent extending shadow ribs (5), the additional ribs (6) extending parallel to each other forming one V-shaped leg extend flush with the corresponding additional rib (6) from one adjacent shadow rib (5), while the additional ribs (6) extending parallel to each other forming the other V-shaped leg extend flush with the corresponding additional rib (6) from the other adjacent shadow rib (5); and In the case of each side shadow rib (5) having an adjacently extending shadow rib (5), only the additional ribs (6) extending parallel to one another and forming a V-shaped leg extend flush with the corresponding additional rib (6) from the adjacent shadow rib (5).

14. The vehicle tire according to any one of claims 1 to 13, characterized in that Independent bolt-shaped protrusions (10) are respectively provided between the additional ribs (6) branching off from the same rib section (5a), and the maximum height (h E ) is 0.05 mm to 0.80 mm, in particular a maximum of 0.10 mm to 0.50 mm, wherein the maximum height (h E ) is preferably smaller than the maximum height (h Z ), and / or wherein the maximum height (h E ) is preferably smaller than the maximum height (h SR ).

15. A vulcanization mold for the form-vulcanization of a vehicle tire (1) according to one or more of claims 1 to 14, wherein the vulcanization mold has at least one mold surface with a concave contour of a shadow area (4), the shadow area having shadow ribs (5) extending side by side and of elongated design, the shadow ribs having longitudinal extension directions (E) extending parallel to one another or to a large extent parallel to one another. R ), It is characterized in that Wherein the concave profile has the following terms: - a first depression for forming a shadow rib (5), which, when viewed from above, extends in a regular wave-like shape and is composed of rib segments (5a) connected to each other, extending in the form of a bottomless isosceles trapezoid, the orientation of which is in line with the longitudinal extension direction (E R ) is consistent; or the rib segment extends in the form of an arc, the orientation of the arc is consistent with the longitudinal extension direction (E R ) are consistent; as well as - a second recess for forming a shadow rib base line (b) of the shadow rib (5) extending along the trapezoidal base or along the arc chord of the circular arc SR ) is located on the side where two additional ribs (6) branching off from each rib segment (5a) and having free ends are formed.

16. A method for manufacturing a vehicle tyre (1) according to any one of claims 1 to 14, wherein the method comprises the following steps: a) engraving a concave profile for forming a shadow area (4) into a mold surface of a vulcanization mold for form-vulcanizing a vehicle tire (1) by laser engraving, wherein the concave profile has the following items: - a first depression for forming a shadow rib (5), which, when viewed from above, extends in a regular wave-like shape and is composed of rib segments (5a) connected to each other, extending in the form of a bottomless isosceles trapezoid, the orientation of which is in line with the longitudinal extension direction (E R ) is consistent; or the rib segment extends in the form of an arc, the orientation of the arc is consistent with the longitudinal extension direction (E R ) are consistent; as well as - a second recess for forming a shadow rib base line (b) of the shadow rib (5) extending along the trapezoidal base or along the arc chord of the circular arc SR ) on the side where the two additional ribs (6) branch off from each rib section (5a) and have free ends, b) vulcanizing the tire blank by means of the vulcanization mold, thereby embossing the shadow area (4) with the shadow ribs (5) and the additional ribs (6) onto the outer surface of the vehicle tire, in particular the sidewall and / or the tread of the vehicle tire.

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