VEHICLE AIR TIRES

Description

[0001] The invention relates to a vehicle pneumatic tire.

[0002] Vehicle tires consist of numerous components. These include the tire carcass, sidewalls, tread, belt, and a variety of other parts. Each component has a specific function within the vehicle tire, ensuring it provides the necessary stability and, for example, a specified material strength. Furthermore, it is important that the vehicle tire has the lowest possible weight to minimize rolling resistance.

[0003] DE 112017002411 T5, EP 1275526 A2, US 2930425 A and US 3568742 A disclose known tire constructions with carcass layers.

[0004] The invention was based on the objective of providing an improved pneumatic vehicle tire.

[0005] In particular, the vehicle tire should have the lowest possible weight, while at the same time exhibiting high material stiffness when cornering.

[0006] The problem is solved by claim 1.

[0007] A particular advantage of the invention lies in the fact that the new tire construction of the pneumatic tire results in a relatively low weight and simultaneously high material stiffness. Furthermore, the pneumatic tire exhibits high stability and material strength in the area of ​​the tire carcass and beneath the tread. The relatively low weight of the pneumatic tire is achieved because only one belt layer, or even no belt layer at all, is provided beneath the tread.

[0008] Conventional pneumatic tires have a tire belt comprising at least one ply. The new tire design features a maximum of one tire belt with a single ply positioned beneath the tread.

[0009] The innovative construction of the tire carcass, featuring a central and side carcass layer, combined with the high tensile strength of the central layer, results in exceptional stability. The synergistic effects of this new carcass construction, particularly the high tensile strength of the central layer, ultimately lead to a lighter tire with superior stability.

[0010] In a further advantageous embodiment of the invention, the central carcass layer is provided to have a tensile strength of approximately 20,000 to 25,000 Newtons per decimeter.

[0011] This tensile strength for the central carcass layer results in high lateral stiffness for the vehicle tire.

[0012] In a further advantageous embodiment of the invention, it is provided that the reinforcing elements of the central carcass layer have an angle in the range of 10° to 70°, preferably in the range of 15° to 55°, and particularly preferably in the range of 20° to 35°, relative to the circumferential direction of the vehicle pneumatic tire.

[0013] This alignment of the reinforcing elements of the central carcass layer results in high stability for the tire carcass.

[0014] In a further advantageous embodiment of the invention, it is provided that the tire carcass comprises two or more side carcass layers and central carcass layers.

[0015] Two superimposed carcass layers increase the stability of the tire carcass.

[0016] In a further advantageous embodiment of the invention, it is provided that the reinforcing elements of the central carcass layer and the side carcass layer consist of steel, polyamide, nylon, aramid, polyester and / or rayon.

[0017] These materials allow for high strength in the tire carcass.

[0018] In a further advantageous embodiment of the invention, it is provided that the reinforcing elements of the central carcass layer and the side carcass layer have a material diameter between 0.1 and 2 mm.

[0019] This allows for optimal force transmission to the tire carcass via the reinforcing elements.

[0020] According to the invention, the ends of the side carcass layers are arranged in the area of ​​the underside of the tire beads.

[0021] A corresponding embodiment is shown in the Figure 1shown. In this design, the tire carcass is anchored in the area of ​​the underside of the tire bead 9.

[0022] In a vehicle tire, it is possible that the ends of the side carcass layers are located below the tread in the tire shoulders.

[0023] A corresponding embodiment is shown in the Figure 2 The double layer arrangement in the sidewall area results in a very stable tire carcass.

[0024] In a vehicle tire, it is possible that the ends of the side carcass layers wrap around the tire cores in the tire bead and are located in the area of ​​the sidewalls.

[0025] A corresponding embodiment is shown in the Figure 3 The ends of the side carcass layer are firmly anchored in the tire bead.

[0026] In an advantageous further development of the invention, it is provided that the reinforcing elements of the belt layer and the reinforcing elements of the central carcass layer are arranged in a crossed manner in the circumferential direction of the vehicle pneumatic tire.

[0027] The intersection of the reinforcing elements gives the tire carcass a high degree of stability below the tread.

[0028] The invention will be described in more detail below using exemplary embodiments.

[0029] They show: Fig. 1 A tire construction in a radial section view according to the invention. Fig. 2 : Another embodiment that does not fall within the scope of protection of the claims. Fig. 3 : Another embodiment that does not fall within the scope of protection of the claims. Fig. 4 : An oversight of the alignment of the reinforcing elements of the tire carcass

[0030] The Figure 1Figure 1 shows a first embodiment of the new tire construction. The vehicle tire 1 comprises a tire carcass 2 with a side carcass layer 3 and a central carcass layer 4. The special feature of the tire carcass 2 is that the reinforcing elements in the central carcass layer 4 do not have a radial orientation. The reinforcing elements in the side carcass layer 3, on the other hand, are oriented in the radial direction 10. The reinforcing elements of the central carcass layer 4 are arranged at an angle between 5° and 85° in the circumferential direction of the vehicle tire 1. The orientation of the reinforcing elements is particularly evident from the Figure 4As can be seen, an inner tire layer 21 is arranged on the inside of the tire carcass 2, which ensures the airtightness of the pneumatic tire. The pneumatic tire has two sidewalls 8 and two beads 9. Optionally, a reinforcement layer 5 consisting of a multitude of individual strips of material can be arranged above the central carcass layer 4 above the tire carcass 2. The pneumatic tire does not include a belt or at most a belt with a single belt layer 6. The pneumatic tire also includes a tread 7. The optional reinforcement layer 5 extends to the shoulder of the pneumatic tire and completely covers at least the central carcass layer 4.

[0031] The central carcass layer 4 has a very high tensile strength of approximately 20,000 to 30,000 N / dm². This high tensile strength of the central carcass layer, combined with the new carcass construction, gives the pneumatic tire a very high material stiffness.

[0032] The resulting pneumatic tire exhibits particularly high lateral stiffness, which is very advantageous for cornering. This high lateral stiffness also improves overall vehicle maneuverability. It is conceivable that the high tensile strength also extends to the tensile strength of the sidewall ply.

[0033] The Figure 2 Figure 1 shows another embodiment. This tire design explicitly does not include a tire belt. The tire carcass 2 comprises a side carcass layer 3 and a central carcass layer 4.

[0034] The side carcass layer 3 and the central carcass layer 4 differ in the orientation of the reinforcing elements, as already seen in the Figure 1 has been described.

[0035] In this carcass construction, the ends 20 of the side carcass ply extend to below the lateral areas of the tread 7. This results in a doubling of the side carcass ply in the area of ​​the sidewall 8. This doubling of the side carcass ply achieves high material stiffness for the tire carcass.

[0036] The Figure 3 shows another embodiment of the tire construction. The tire carcass 2 is, as in the Figure 1 described, constructed. In this tire carcass construction, the ends 23 of the side carcass layer are arranged in the tire bead 9. The ends of the side carcass layer 3 wrap around the schematically depicted tire core 24 and terminate in the sidewall 8.

[0037] Figure 4Figure 1 shows a schematic representation of the course of the reinforcing elements 12 of the tire carcass, the reinforcing element 17 of the optional reinforcement layer and the reinforcing element 18 of the optional belt layer.

[0038] It shows a partial view of a schematically depicted tire carcass.

[0039] The alignment of the reinforcing elements in the side carcass layer in the area of ​​the side walls is shown with brackets 14 and 15.

[0040] The orientation of the reinforcing elements in the central carcass layer in the area under the tread is shown with bracket 13.

[0041] The circumferential direction of the vehicle's pneumatic tire is indicated by the directional arrow 11.

[0042] The reinforcing elements 12 run radially in the area 14 and 15 of the side carcass layers and at an angle of approximately 90° to the circumferential direction 11.

[0043] In contrast, the individual reinforcing elements 12 in the central carcass layer continue to run parallel to each other, but have an inclination relative to the circumferential direction 11.

[0044] The reinforcing bars in the central carcass layer form an angle with the circumferential direction that is less than 90°.

[0045] In the example shown, an angle of approximately 52° is formed with the circumferential direction 11.

[0046] The central carcass ply exhibits a tensile strength of approximately 20,000 to 30,000 N / dm² in area 13. The tensile strength of a carcass ply is essentially determined by the tensile strength of the individual reinforcing elements 12. The tensile strength of the carcass ply can be determined, in particular, by testing a section of the carcass ply in a tensile test. Normally, the tensile strengths of the central carcass ply and the side carcass ply are the same. However, they can also differ, for example, by changing the material diameter of the reinforcing elements in the side carcass ply. The tensile strength of over 20,000 N / dm² is considerably higher than that of conventional pneumatic tires. As a result, the pneumatic tire possesses very high material stiffness, especially very high cornering stiffness, even without belt plies.

[0047] The figure also shows a schematic material strip 16 of the optional reinforcement layer. The material strip 16 comprises a plurality of reinforcing elements 17 embedded in the rubber material of the material strip 16. The reinforcing elements 17 run essentially in the circumferential direction 11 of the vehicle tire. A plurality of material strips 16 are wound onto the tire carcass above the central carcass layer. The material strips 16 of the reinforcement layer possess high puncture resistance against sharp objects. The figure also shows the course of the reinforcing elements 18 of an optional belt layer. The reinforcing elements 18 of the optional belt layer run intersecting with the reinforcing elements of the central carcass layer and the reinforcement layer.The intersection of the reinforcing elements 18 and the reinforcing elements 12 of the tire carcass results in high stability of the tire carcass below the tread. Reference symbol list

[0048] 1 Vehicle pneumatic tire 2 Tire carcass 3 Side carcass ply 4 Central carcass ply 5 Reinforcement ply consisting of multiple material strips 6 Belt ply with a maximum of one belt ply 7 Tread 8 Sidewall 9 Tire bead 10 Radial direction 11 Circumferential direction 12 Strengthening elements of the tire carcass 13 Alignment of the strengthening elements in the central carcass ply 14 Alignment of the strengthening elements in the side carcass ply in the area of ​​the left sidewall 15 Alignment of the strengthening elements in the side carcass ply in the area of ​​the right sidewall 16 Individual material strip of the reinforcement ply 17 Strengthening element of the reinforcement ply 18 Strengthening element of the belt ply 19 Ends of the side carcass ply are located in the area of ​​the underside of the tire beads 20 Ends of the side carcass ply are located below the tread in the tire shoulders 21 Inner tire layer 22Area covered by the reinforcement layer 23Ends of the side carcass layers encircle the tire cores in theTire bead 24 Tire core

Claims

1. Pneumatic vehicle tyre (1), comprising: a) a tyre carcass (2) with at least one carcass ply; wherein a multiplicity of reinforcements are disposed in the carcass ply, b) a tread (7) lying on the outside in relation to the tyre carcass (2), c) two sidewalls (8), d) two tyre beads (9), e) an inner tyre layer (21), lying radially on the inside in relation to the tyre carcass (2), the pneumatic vehicle tyre (1) having a tyre belt with a maximum of one belt ply (6) or no belt ply, wherein the tyre carcass (2) has in the region of the sidewalls (9) at least one side carcass ply (3) with reinforcements (12) aligned in the radial direction, and a central carcass ply (4) in the region below the tread, wherein the reinforcements (12) of the central carcass ply (4) are disposed at an angle in the range of 5° to 85° in relation to the circumferential direction (11) of the pneumatic vehicle tyre, characterized in that the central carcass ply (4) has a tensile strength of approx. 20 000 to 30 000 Newtons per decimetre in order to achieve a high material stiffness of the tyre carcass (2); wherein the ends (19) of the side carcass plies (3) are disposed in the region of the underside of the tyre beads (9).

2. Pneumatic vehicle tyre (1) according to Claim 1, characterized in that the central carcass ply (4) has a tensile strength of approx. 20 000 to 25 000 Newtons per decimetre.

3. Pneumatic vehicle tyre according to one of the preceding claims, characterized in that the reinforcements (12) of the central carcass ply (4) have with respect to the circumferential direction (11) of the pneumatic vehicle tyre (1) an angle in the range from 10° to 70°, preferably in the range from 15° to 55°, particularly preferably in the range from 20° to 35°.

4. Pneumatic vehicle tyre according to one of the preceding claims, characterized in that the tyre carcass (2) comprises two or a plurality of side carcass plies (3) and central carcass plies (4).

5. Pneumatic vehicle tyre according to one of the preceding claims, characterized in that the reinforcements (17) of the central carcass ply and of the side carcass ply consist of steel, polyamide, nylon, aramid, polyester and / or rayon.

6. Pneumatic vehicle tyre according to one of the preceding claims, characterized in that the reinforcements (12) of the central carcass ply (4) and of the side carcass ply (3) have a material diameter between 0.1 and 2 mm.