Vehicle pneumatic tires

Abstract

To improve the tire construction of vehicle pneumatic tires, it is proposed that the tire bead (9) has a tire core in the shape of a raindrop, wherein the tire core has a core base (5) and a core projection (4), wherein the lower part (3) of the apex surrounds the core projection (4) in a V-shape.

Description

[0001] The invention relates to a pneumatic tire for vehicles. Pneumatic tires for vehicles consist of a multitude of tire components. These tire components include a tire carcass, sidewalls, tread, belt, and a multitude of other components. All tire components have a specific function for the pneumatic tire, ensuring that it exhibits the necessary stability and, for example, a predetermined material strength.

[0002] The invention was based on the objective of providing an improved pneumatic tire for vehicles. In particular, the pneumatic tire should have high material stiffness in the lateral direction in order to improve the driving characteristics of the vehicle tire.

[0003] The problem according to the preamble and characterizing features of claim 1 is solved by the fact that the tire bead has a tire core in the shape of a raindrop, wherein the tire core has a core base and a core protrusion, the lower part of the apex surrounding the core protrusion in a V-shape.

[0004] A particular advantage of the invention lies in the fact that the new tire construction of the pneumatic tire significantly improves driving characteristics. With its new bead construction featuring a raindrop-shaped core, the tire achieves significantly higher lateral stiffness compared to conventional tires. The raindrop-shaped extension of the core, with its base and projection, enhances the lateral stiffness of both the bead and the sidewall. This increased lateral stiffness allows the tire to respond more directly to steering inputs. The tire's handling is thus considerably improved. Computer simulations of corresponding tires demonstrate an increase in lateral stiffness of approximately 4%.

[0005] In an advantageous embodiment of the invention, the apex consists of a lower apex part and an upper apex part, both of which have different material properties. This allows for better optimization of the tire bead with regard to the required material properties.

[0006] In a further advantageous embodiment of the invention, it is provided that the upper apex part has a higher Shore hardness than the lower apex part. where the difference is at least 10 Shore hardnesses.

[0007] This results in increased material stiffness, particularly in the upper tire bead area.

[0008] In a further advantageous embodiment of the invention, it is provided that the upper apex part has a Shore hardness of 70 to 100 with a modulus of elasticity greater than 10 N / mm². 2 exhibits where the lower apex part has a Shore hardness of 50 to 80 with a modulus of elasticity less than 10 N / mm² 2 exhibits.

[0009] By selecting these material properties, the lateral stiffness of the side wall is significantly improved.

[0010] In a further advantageous embodiment of the invention, the core base is provided to have a height dimension of 3 mm to 15 mm, preferably 4 mm to 12 mm. where the height dimension of the core projection is 100% to 150% of the height dimension of the core base.

[0011] These height dimensions result in improved material stiffness of the side wall.

[0012] In a further advantageous embodiment of the invention, the core base has a width dimension of 3 mm to 15 mm, preferably 4 mm to 12 mm. wherein the width dimension of the core projection at its thickest point is less than 80% of the width dimension of the core base, the core projection is pointed.

[0013] This results in optimal material stiffness between the tire core and the apex.

[0014] In a further advantageous embodiment of the invention, it is provided that the height dimension from the underside of the core base to the top of the lower apex part is 100% to 150% of the height dimension of the core base.

[0015] This results in optimal lateral material stiffness for the tire bead.

[0016] In a further advantageous embodiment of the invention, it is provided that the height dimension of the upper apex part is 40 mm to 71 mm.

[0017] As a result, the upper part of the tire bead also possesses high material stiffness.

[0018] In a further advantageous embodiment of the invention, it is provided that the core base has a width dimension of 3 mm to 15 mm, preferably 4 mm to 12 mm.

[0019] This dimension for the core base allows for optimal clamping of the tire bead. This ensures, in particular, a secure fit of the tire on the vehicle rim.

[0020] The invention will be described in more detail below using an exemplary embodiment.

[0021] It shows: Fig. 1: A tire construction in a radial section view

[0022] The Fig.Figure 1 shows an embodiment of the new tire construction. The vehicle tire comprises a tread 7, a sidewall 8, a carcass ply 1, and a tire bead 9. A tire core in the shape of a raindrop is arranged in the tire bead 9. The tire core comprises a rectangular core base 5 and a core projection 4, which is pointed towards the sidewall. The tire core consists of wound metal wires. The figure shows the height dimension a of the core base and the height dimension b of the core projection. The tire core also has a width dimension e. The core projection 4 is enclosed in a V-shape by a lower part of the apex 3. An upper apex part 2 is arranged on the upper surface of the lower apex part 3. The upper apex part 2 has a higher Shore hardness than the lower apex part 3. Dimension c shows the height dimension to the upper surface of the lower apex part 3.Dimension d shows the height dimension of the upper apex 2. The carcass ply 1 encircles the tire bead 9. The end of the carcass ply 1 is approximately at the same height as the tip of the bead projection 4. The new tire construction achieves high material stiffness in the lateral direction 6 of the vehicle tire. This increased material stiffness particularly improves the handling characteristics of the vehicle tire. Reference symbol list 1 carcass layer 2 Upper Apex Part 3 Lower Apex Part 4 Key Advantages 5 Core Basis 6 Lateral direction 7 treads 8 side wall 9 tire bead a Height dimension of the core base b Height dimension of the core projection c Height dimension to the top of the lower apex part d Height dimension of the upper apex part e Width dimension of the core base f Height dimension of the core projection at its thickest point

Claims

[1] Vehicle pneumatic tires, comprising: a) a tire carcass comprising at least one carcass ply (1), b) a tread strip (7) located on the outside of the tire carcass relative to the tire carcass c) two side walls (8), d) two tire beads (9) each with a tire core and an apex, characterized by , that the tire bead (9) has a tire core in the shape of a raindrop, wherein the tire core has a core base (5) and a core projection (4), wherein the lower part (3) of the apex surrounds the core projection (4) in a V-shape. [2] Vehicle pneumatic tires according to claim 1, characterized by , that the apex consists of a lower apex part (3) and an upper apex part (2), wherein both apex parts have different material properties [3] Vehicle pneumatic tires according to one of the preceding claims, characterized by , that the upper apex part (2) has a higher Shore hardness than the lower apex part (3), where the difference is at least 10 Shore hardnesses. [4] Vehicle pneumatic tires according to one of the preceding claims, characterized by , that the upper apex part (2) has a Shore hardness of 70 to 100 with a modulus of elasticity greater than 10 N / mm² 2 exhibits wherein the lower apex part (3) has a Shore hardness of 50 to 80 with a modulus of elasticity less than 10 N / mm² 2 exhibits. [5] Vehicle pneumatic tires according to any one of the preceding claims, characterized by , that the core base (5) has a height dimension (a) of 3 mm to 15 mm, preferably 4 mm to 12 mm, wherein the height dimension (b) of the core projection (4) is 100% to 150% of the height dimension (a) of the core base. [6] Vehicle pneumatic tires according to any one of the preceding claims, characterized by , that the core base (5) has a width dimension (e) of 3 mm to 15 mm, preferably 4 mm to 12 mm, wherein the width dimension (f) of the core projection (4) at its thickest point is less than 80% of the width dimension (a) of the core base (5), wherein the core projection (4) is pointed. [7] Vehicle pneumatic tires according to any one of the preceding claims, characterized by , that the height dimension (c) from the underside of the core base to the top of the lower apex portion is 100% to 150% of the height dimension (a) of the core base (5). [8] Vehicle pneumatic tires according to any one of the preceding claims, characterized by , that the height dimension (d) of the upper apex part (2) is 40 mm to 71 mm. [9] Vehicle pneumatic tires according to any one of the preceding claims, characterized by , that the core base (5) has a width dimension (e) of 3 mm to 15 mm, preferably 4 mm to 12 mm.

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