Vehicle tire

Abstract

The invention relates to a vehicle tire (1) having a belt assembly (7) and a carcass ply (3), wherein the carcass ply (3) connects bead cores (5) to one another and projects around the bead cores (5) with carcass turn-ups (8), wherein the rectilinear carcass portion (9) that adjoins the carcass turn-ups (8), that begins at the bead cores (5) in the unmounted state laterally at the smallest distance from the lateral center of the vehicle tire and ends at the turning point (10) of the carcass ply (3) lying in the sidewall region of the vehicle tire (1) has a predominantly rectilinear profile in cross section in the lateral direction of the vehicle tire (1).

Description

[0001] 202307427

[0002] 1

[0003] Description

[0004] Vehicle tires

[0005] The invention relates to a vehicle tire with a belt structure and a carcass layer, wherein the carcass layer connects bead cores and surrounds the bead cores with carcass wraps.

[0006] Vehicle tires of the described type are known. The carcass plies of known vehicle tires change their contour, particularly in the radially inner sidewall area and in the bead area, when they are mounted, inflated, and used. This causes the vehicle tires to increase in diameter in the shoulder area. This effect, also known as tire growth, is detrimental with regard to wear and rolling resistance.

[0007] Against this background, the invention is based on the objective of designing a vehicle tire in such a way that it is improved with regard to wear and rolling resistance.

[0008] This problem is solved with a vehicle tire according to the features of claim 1. The dependent claims relate to particularly advantageous further developments of the invention.

[0009] According to the invention, a vehicle tire, in particular a commercial vehicle tire, is provided with a belt structure, or belt layer, and a carcass layer, wherein the carcass layer connects bead cores to one another and surrounds the bead cores with carcass wraps. The carcass layer adjoins the carcass wraps, begins laterally or axially at the bead cores in the unmounted state at the smallest distance to the lateral center of the vehicle tire, i.e., at the laterally inner point, and is located at the turning point of the carcass layer 202307427 in the sidewall area of ​​the vehicle tire.

[0010] The two terminating straight carcass sections in a cross-section in the lateral direction of the vehicle tire exhibit a predominantly straight profile. This predominantly straight profile shows a maximum deviation of at least less than 8 mm from an ideal straight profile between the starting and ending points of the straight carcass section. The cross-section is a cross-section of an unmounted, meaning never before mounted, and undamaged vehicle tire.

[0011] The predominantly straight profile reduces the contour change of the carcass layer and counteracts an increase in the vehicle tire diameter in the shoulder area, thus enabling a vehicle tire optimized in terms of wear and rolling resistance.

[0012] The maximum deviation between the predominantly straight path and the ideal straight path between the starting and ending points of the straight carcass section is measured perpendicular to the ideal path. A predominantly straight path is characterized by a maximum deviation of 8 mm from the ideal straight path.

[0013] A preferred embodiment provides that the predominantly straight path has a maximum deviation of less than 6 mm, preferably less than 5 mm, more preferably less than 4 mm, and more preferably less than 3 mm from the ideal straight path between the laterally inner point and the inflection point of the carcass layer. It has been found that the contour change of the carcass layer is smaller the smaller the deviation from the ideal path.

[0014] Another preferred embodiment provides that the vehicle tire has a chafer, in particular a steel cord chafer, wherein the chafer has a smaller radial extent on the side facing laterally towards the center of the vehicle tire than on the side facing laterally away from the center of the vehicle tire.

[0015] Another preferred embodiment provides that the vehicle tire has an apex, wherein the apex is located on the side facing laterally towards the center of the vehicle tire 202307427

[0016] 3

[0017] The side exhibits a concave profile extending over at least 30%, preferably at least 40%, and further over at least 50% of the radial extent of the apex. It has been shown that the concave profile of the apex results in reduced contour changes of the carcass layer.

[0018] Another preferred embodiment provides that the apex has lower strength on the side facing laterally towards the center of the vehicle tire than on the side facing away from the center of the vehicle tire. It has been shown that the lower strength of the apex on the side facing the center of the vehicle tire results in reduced contour change of the carcass ply.

[0019] Another preferred embodiment provides that the apex has a principal direction of extension in cross-section, wherein the principal direction of extension deviates from the radial direction of the vehicle tire from the lateral center of the vehicle tire by an angle of at least 10 degrees, preferably at least 15 degrees, more preferably at least 20 degrees, and most preferably at least 25 degrees. The principal direction of extension is the direction in which the apex has its greatest extent in cross-section. It has been shown that the aforementioned angles result in a reduced contour change of the carcass ply.

[0020] The invention allows for numerous embodiments. To further illustrate its basic principle, one of these is shown in the drawings and described below. This shows in

[0021] Fig. 1 shows a cross-section of a vehicle tire;

[0022] Fig. 2 shows a section of a cross-section of a vehicle tire.

[0023] Figure 1 shows a vehicle tire 1 with an airtight inner layer 2, which, in the cross-section shown, extends radially rR and axially aR to a second bead area on the inside of the vehicle tire, starting from a first bead area, and also circumferentially U over the entire circumference. The vehicle tire 1 has a carcass 3 or a carcass layer 3 with reinforcing elements, wherein 202307427

[0024] 4 The carcass 3 extends from the zenith area of ​​the tire over the sidewalls 4 into the bead area. The carcass 3 encloses tensile-resistant bead cores 5. A profiled tread 6 is arranged radially on the outside of the vehicle tire 1. A belt reinforcement 7 can be arranged between the tread 6 and the carcass 3, the belt reinforcement 7 comprising reinforcing elements.

[0025] Figure 2 shows a vehicle tire 1 for a commercial vehicle. The vehicle tire 1 has a belt structure 7 and a carcass ply 3, wherein the carcass ply 3 connects bead cores 5 and surrounds the bead cores 5 with carcass wraps 8. The straight carcass section 9 adjoining the carcass wraps 8 begins at the bead cores 5, specifically at the point that, in the unmounted state, is laterally closest to the lateral center of the vehicle tire, the laterally inner point 10. The straight carcass section 9 ends in the sidewall region of the vehicle tire 1, specifically at the turning point 11 of the carcass ply in the sidewall region. The maximum deviation of the straight carcass section 8 from an ideal straight path 12 between the starting point and the end point of the straight carcass section 8 is 4 mm to 10 mm.In the area of ​​the carcass folds 8, the vehicle tire 1 has chafers 13 that run parallel to the carcass folds 8. Apexes 14 are arranged radially on the outside of the bead cores 5.

[0026] 202307427

[0027] 5

[0028] Reference symbol list

[0029] 1 vehicle tire

[0030] 2 inner layer

[0031] 3 Carcass, carcass ply

[0032] 4 side walls

[0033] 5 bead core

[0034] 6 Running surface

[0035] 7 Belt position, belt bandage

[0036] 8 Carcass wraps

[0037] 9 straight carcass sections

[0038] 10 lateral inner point

[0039] 11 Turning Point

[0040] 12 ideal straight lines

[0041] 13 Chafer

[0042] 14 Apex aR axial direction rR radial direction

[0043] U circumferential direction

Claims

202307427 6 Patent claims 1. Vehicle tire (1), in particular commercial vehicle tire, comprising a belt assembly (7) and a carcass ply (3), wherein the carcass ply (3) connects bead cores (5) to one another and surrounds the bead cores (5) with carcass wraps (8), characterized in that the straight carcass section (9) adjoining the carcass wraps (8), beginning laterally at the smallest distance to the lateral center of the vehicle tire in the unmounted state and ending at the turning point (10) of the carcass ply (3) located in the sidewall region of the vehicle tire (1), has a predominantly straight profile in a cross-section in the lateral direction of the vehicle tire (1), wherein the predominantly straight profile has a maximum deviation of at least less than 10 mm from an ideal straight profile (12) between the starting point and the end point of the straight carcass section (9). exhibitswhere the cross-section is a cross-section of an unmounted and undamaged vehicle tire (1).

2. Vehicle tire (1 ) according to claim 1 , characterized in that the predominantly straight course has a maximum deviation of less than 10 mm, preferably less than 8 mm, more preferably less than 6 mm and more preferably less than 3 mm from the ideal straight course (12) between the laterally inner point (10) and the inflection point (11 ) of the carcass layer (3).

3. Vehicle tire (1 ) according to claims 1 or 2, characterized in that the vehicle tire (1 ) has a chafer (13), in particular a steel cord chafer, wherein the chafer (13) has a lesser radial extent on the side facing laterally towards the center of the vehicle tire than on the side facing laterally away from the center of the vehicle tire.

4. Vehicle tire (1) according to one of the preceding claims, characterized in that the vehicle tire (1) has an apex (14), wherein the 202307427 7 Apex (14) has a concave profile on the side facing laterally towards the center of the vehicle tire, extending over at least 30%, preferably at least 40% and further over at least 50% of the radial extent of the apex (14).

5. Vehicle tire (1 ) according to one of the preceding claims, characterized in that the apex (14) has a lower strength on the side facing laterally towards the center of the vehicle tire than on the side facing away from the center of the vehicle tire.

6. Vehicle tire (1 ) according to one of the preceding claims, characterized in that the apex (14) has a principal direction of extension in cross-section, wherein the principal direction of extension deviates by an angle of at least 10 degrees, preferably at least 15 degrees, more preferably at least 20 degrees and most preferably at least 25° from the radial direction (rR) of the vehicle tire (1 ) from the lateral center of the vehicle tire.

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