Pneumatic vehicle tyre and method for producing pneumatic vehicle tyre
By combining rubber materials with different Shore A hardness and winding processes, the problem of difficult to balance the grip characteristics and driving comfort of the vehicle pneumatic tires is solved, and flexible modification of the tread cross-section form and economical production of performance is achieved, ensuring that the tires are in Good performance under different conditions.
Patent Information
- Application Number
- CN202380042574.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-24
- Filing Date
- 2023-05-15
- Publication Date
- 2025-01-03
AI Technical Summary
Existing vehicle pneumatic tires are difficult to balance in grip characteristics and driving comfort, and economical modifications are difficult to meet the needs of different handling characteristics in the cross-sectional form of the tread section.
The central tread portion made of the first rubber material is combined with the tread portion made of the second rubber material. The central tread portion is formed by a single-use winding, and the tread portion is formed by a spiral overlap winding to ensure the central tread portion. The harder and the tread part is softer, thus achieving a balance between grip and manipulation characteristics.
A balance between the grip characteristics and driving comfort of the vehicle pneumatic tires, which can economically produce tires with desired grip characteristics and handling characteristics, ensuring good driving comfort and handling characteristics, especially when tread wears performance.
Smart Images
Figure CN119255922A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a pneumatic vehicle tire, comprising a tread having a width and having a central tread portion made of a first rubber material extending over a portion of the width of the tread, and a tread portion made of a second rubber material, the central tread portion being adjacent to a first portion, forming a lateral portion of the outer surface of the tread, and extending continuously over the entire width of the tread, the first rubber material having a Shore A hardness according to DIN ISO 7619-1 being greater than the Shore A hardness of the second rubber material.
[0002] The invention also relates to a method for producing such a pneumatic vehicle tyre. Background Art
[0003] A vehicle pneumatic tire of the type mentioned in the opening paragraph is known, for example, from WO 01 / 39998 A1, which is a motorcycle tire. The motorcycle tire comprises a tread having a central tread portion and a tread portion extending continuously over the entire width of the tread. The central tread portion is "inserted" into the tread portion extending continuously over the entire width of the tread, with the result that the continuously extending tread portion extends radially inside the central tread portion. The rubber material of the central tread portion has a Shore A hardness of at least 50 ShA (Shore A) at 100° C. The rubber material of the tread portion extending continuously over the entire width of the tread has a Shore A hardness of 40 to 49 ShA at 100° C. Summary of the invention
[0004] The object on which the invention is based is to design a pneumatic vehicle tire of the type mentioned at the outset in such a way that the tread of the pneumatic vehicle tire is particularly balanced in the new state with regard to its road-holding properties, while at the same time aiming to maintain good driving comfort and good handling characteristics. A method for producing such a pneumatic vehicle tire is also provided, aiming to make it possible to produce a tread portion having a variable cross-sectional form.
[0005] With regard to a pneumatic vehicle tire, said object is achieved according to the invention in that a tread portion extending over the entire width of the tread radially overlaps the central tread portion on the outside and forms the complete outer surface of the tread.
[0006] With regard to the method, the object is achieved in that a central tread portion is formed by a single winding of extruded rubber compound and a tread portion extending over the entire width of the tread is formed by repeated spiral and overlapping windings of extruded rubber compound strips.
[0007] The vehicle pneumatic tire has particularly favorable gripping properties and good handling properties due to the softer tread portion extending continuously on the outer surface of the tread. The central tread portion located radially on the inside of this tread portion is harder, thereby ensuring good driving comfort.
[0008] The method according to the invention makes it possible to easily modify the tread portion with respect to its cross-sectional form, as a result of which tyres having correspondingly desired grip and handling characteristics can be produced particularly economically.
[0009] According to a preferred embodiment, the Shore A hardness of the rubber material of the tread portion extending over the entire width of the tread is 50.0 ShA to 65.0 ShA, in particular 55.0 ShA to 63.0 ShA. This measure is particularly advantageous for achieving optimal driving comfort.
[0010] A further preferred embodiment is characterized in that the Shore A hardness of the rubber material of the central tread portion is 3.0 ShA to 25.0 ShA, in particular up to 20.0 ShA, preferably up to 15.0 ShA, particularly preferably 8.0 ShA to 12.0 ShA greater than the Shore A hardness of the rubber material of the tread portion extending over the entire width of the tread. This measure ensures advantageous stability of the softer tread portion with regard to grip and handling properties.
[0011] It is also preferred that the Shore A hardness of the rubber material of the central tread portion is at most 75.0 ShA. This measure contributes in particular to maintaining good driving comfort as tread wear increases.
[0012] According to another preferred embodiment, the width of the central tread portion is 30% to 85%, in particular 40% to 75%, of the width of the tread. Thus, the softer rubber material of the tread portion, which extends over the entire width of the tread when the tire is new, is retained even as the wear of the tread increases in the correspondingly wide lateral portions of the tread. This helps to maintain good handling characteristics during cornering as the tread wears.
[0013] Preferably, the central tread portion is symmetrical relative to the equatorial plane of the tyre as viewed in cross section.
[0014] According to another preferred embodiment, the thickness of the central tread portion in radial direction at its thickest point, as viewed in cross section, is 50% to 90%, in particular 60% to 85%, of the thickness of the tread determined in radial direction on the equatorial plane of the tire. This measure contributes to good driving comfort when the tire is new.
[0015] In the last-mentioned embodiment, it is advantageous if the central tread portion has its thickest point at least in the equatorial plane of the tyre.
[0016] Another preferred embodiment is characterized in that the central tread portion, as viewed in cross section, is circular segment-shaped and tapers towards the shoulders of the tread.
[0017] In an alternative and equally preferred embodiment, the central tread portion, as viewed in cross section, has a middle portion having a width determined in the axial direction of 15% to 30% of the width of the central tread portion and two side portions, which are thinner than the middle portion and have end portions tapering towards the shoulders of the tread. A central tread portion designed in this way allows fine tuning of the grip characteristics, driving comfort and handling characteristics.
[0018] Preferably, the vehicle pneumatic tire is a vehicle pneumatic tire for a single track motor vehicle.
[0019] Particularly preferably, the vehicle pneumatic tire is a motorcycle tire. In particular, in the case of motorcycle tires, even with increasing wear of the tread, good driving comfort and particularly good grip and handling properties when cornering are ensured.
[0020] Another preferred embodiment is characterized in that the central tread portion is produced from an extruded rubber compound and the tread portion extending over the entire width of the tread is produced by strips of extruded rubber compound being repeatedly wound spirally and overlapping. In the case of a tire formed in this way, the tread can be adapted particularly easily during manufacture, as a result of which the tire can be configured particularly easily with respect to the desired grip characteristics, driving comfort and handling characteristics. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Further features, advantages and details of the present invention will now be discussed in more detail with reference to the accompanying drawings, which schematically illustrate exemplary embodiments of the present invention. In the drawings:
[0022] Figure 1 shows a section through a motorcycle tyre having a first embodiment variant of the invention, and
[0023] Figure 2 Shown is a section through a motorcycle tyre having a second embodiment variant of the invention.
[0024] List of Reference Numerals
[0025] 1...............Tread
[0026] 2...............Tiny wall
[0027] 3...............Belt
[0028] 4...............Inner layer
[0029] 5...............Carcass ply
[0030] 5a..............Carcass turn-up
[0031] 6...............Bead area
[0032] 6a..............Bead core
[0033] 6b..............Bead filler
[0034] 7a..............Center tread section
[0035] 7b..............Tread part
[0036] 8a..............Center tread section
[0037] 8a'.............Middle part
[0038] 8a”............side section
[0039] 8b..............Tread part
[0040] AA............line (equatorial plane of the tire)
[0041] b1, b 2、 b3, b3'....width
[0042] d1, d2, d3.......thickness DETAILED DESCRIPTION
[0043] The vehicle pneumatic tire designed according to the present invention is a tire for a motor vehicle, in particular a tire for a single-track motor vehicle, preferably a tire for a motorcycle, or a tire for a multi-track motor vehicle, in particular a passenger car, a van or a light truck (a small cargo vehicle with a GVW ≤ 3.5 t, a light cargo vehicle with a GVW ≤ 7.5 t).
[0044] Figure 1 and Figure 2Each shows a section through a radial vehicle pneumatic tire for motorcycles. The vehicle pneumatic tire has a tread 1, two sidewalls 2, a belt layer 3, an inner layer 4, a carcass ply 5 and a plurality of bead areas 6 with respective bead cores 6a and respective bead fillers 6b. The equatorial plane of the tire is indicated by the respective line AA.
[0045] The belt 3 has one or two plies each consisting of reinforcing members, for example steel or textile cords of known construction, embedded in a belt rubber compound and extending parallel to one another.
[0046] The carcass ply 5 extends between the belt layer 3 and the inner layer 4 and between the sidewall 2 and the inner layer 4, and is wound on the bead core 6a, thereby forming a carcass turn-up 5a. The carcass ply 5 is composed of a carcass topping compound and reinforcing members, which are embedded in the carcass topping compound and are in particular steel or textile cords of known construction.
[0047] The tread 1 is provided with a pattern not shown and designed, for example, in a known manner, and has, as seen in section, a thickness d1 determined in the equatorial plane of the tyre and in the radial direction and a width b1 determined perpendicularly to the equatorial plane of the tyre. The thickness d1 is determined between the belt 3 and the periphery of the tread. The periphery of the tread is defined by an envelope containing the outer surface of the tread. The width b1 is measured between the farthest points of the tread 1.
[0048] exist Figure 1 and Figure 2 In the embodiment shown, the tread 1 consists in each case of a central tread portion 7a ( Figure 1 )、8a( Figure 2 ) and a tread portion 7b ( Figure 1 )、8b( Figure 2 The tread portions 7b, 8b laterally adjoin the central tread portions 7a, 8a, radially cover the central tread portions 7a, 8a on the outside and form the complete outer surface of the tread when the tyre is new.
[0049] In accordance with Figure 1 In the embodiment, as observed from the cross section, the width b2 of the central tread portion 7a determined in the equatorial plane perpendicular to the tire is 30% to 85%, in particular 35% to 45%, of the width b1 of the tread 1, and the thickness d2 determined in the equatorial plane of the tire and in the radial direction is 50% to 90%, in particular 60% to 85% of the thickness d1 of the tread 1, and the central tread portion is circular arc-shaped, so that the central tread portion gradually becomes thinner toward the shoulder of the tread.
[0050] exist Figure 2 In the illustrated embodiment, as observed from a cross section, the central tread portion 8a has a width b3 determined in a plane perpendicular to the equatorial plane of the tire of 50% to 85%, in particular 60% to 70%, of the width b1 of the tread 1, and a thickness d3 determined in the equatorial plane of the tire and in a radial direction of 50% to 90%, in particular 60% to 85% of the thickness d1, and the central tread portion 8a has a middle portion 8a' and two side portions 8a", which are thinner than the middle portion and have respective end portions (no reference numerals are provided) that taper toward the shoulders of the tread. As observed from a cross section, the width b3' of the middle portion 8a' relative to the radial outer surface of the side portion 8a" is 15% to 30% of the width b3.
[0051] The tread parts 7 b , 8 b consist of a rubber material having a Shore A hardness of 50.0 ShA to 65.0 ShA, in particular 55.0 ShA to 63.0 ShA, according to DIN ISO 7619-1.
[0052] The Shore A hardness according to DIN ISO 7619-1 of the rubber material constituting the central tread portions 7a, 8a is 3.0 ShA to 25.0 ShA, in particular up to 20.0 ShA, preferably up to 15.0 ShA, particularly preferably 8.0 ShA to 12.0 ShA greater than the Shore A hardness of the rubber material of the tread portions 7b, 8b.
[0053] It is also preferred that the rubber materials of the tread portions 7a, 7b, 8a, 8b match each other such that the Shore A hardness of the rubber material of the central tread portion 7a, 8a is at most 75.0 ShA.
[0054] The central tread portions 7a, 8a are produced in correspondingly shaped moulds from an extruded rubber compound which is placed onto a formed tyre carcass or a formed belt when the tyre is produced. The tread portions 7b, 8b are produced from an extruded rubber compound strip which is repeatedly wound spirally and partly overlappingly (strip winding) after the extruded rubber compound forming the central tread portions 7a, 8b has been placed onto the rubber compound strip.
[0055] The invention is not restricted to the exemplary embodiments described.
[0056] In particular, the tyre may also be a tyre for a passenger car, a van or a light truck.
Claims
1. A pneumatic vehicle tire, comprising a tread (1), the tread having a width (b1) and having a central tread portion (7a, 8a) made of a first rubber material and a tread portion (7b, 8b) made of a second rubber material, the central tread portion extending over a portion of the width (b1) of the tread (1), the tread portion adjoining the first portion, forming a lateral portion of the outer surface of the tread and extending continuously over the entire width (b1) of the tread (1), the first rubber material having a Shore A hardness according to DIN ISO 7619-1 greater than the Shore A hardness of the second rubber material, It is characterized in that The tread portion (7b, 8b) extending over the entire width (b1) of the tread (1) radially covers the central tread portion (7a, 8a) on the outside and forms the complete outer surface of the tread.
2. The vehicle pneumatic tire according to claim 1, wherein: The Shore A hardness of the rubber material of the tread portion (7b, 8b) extending over the entire width (b1) of the tread (1) is 50.0 ShA to 65.0 ShA, in particular 55.0 ShA to 63.0 ShA.
3. The vehicle pneumatic tire according to claim 1 or 2, characterized in that: The Shore A hardness of the rubber material of the central tread portion (7a, 8a) is 3.0ShA to 25.0ShA, particularly up to 20.0ShA, preferably up to 15.0ShA, particularly preferably 8.0ShA to 12.0ShA greater than the Shore A hardness of the rubber material of the tread portion (7b, 8b) extending over the entire width (b1) of the tread (1).
4. The vehicle pneumatic tire according to any one of claims 1 to 3, characterized in that: The Shore A hardness of the rubber material of the central tread portion (7a, 8a) is at most 75.0 ShA.
5. The vehicle pneumatic tire according to any one of claims 1 to 4, characterized in that: The width (b2, b3) of the central tread portion (7a, 8a) is 30% to 85%, in particular 40% to 75%, of the width (b1) of the tread (1).
6. The vehicle pneumatic tire according to any one of claims 1 to 5, characterized in that: The central tread portion (7a, 8a) is symmetrical relative to the equatorial plane (line AA) of the tyre as viewed in cross section.
7. The vehicle pneumatic tire according to any one of claims 1 to 6, characterized in that: As observed from the cross section, the thickness (d2, d3) of the central tread portion (7a, 8a) in the radial direction at its thickest point is 50% to 90%, in particular 60% to 85%, of the thickness (d1) of the tread (1) determined in the radial direction on the equatorial plane (line AA) of the tire.
8. The vehicle pneumatic tire according to claim 7, wherein: The central tread portion (7a, 8a) has its thickest point at least in the equatorial plane (line AA) of the tyre.
9. The vehicle pneumatic tire according to any one of claims 1 to 8, characterized in that: As viewed in cross section, the central tread portion (7a) is circular segmental and tapers towards the shoulders of the tread.
10. The vehicle pneumatic tire according to any one of claims 5 to 8, characterized in that: As observed from the cross section, the central tread portion (8a) has a middle portion (8a') and two side portions (8a"), the middle portion having a width (b3') determined in the axial direction that is 15% to 30% of the width (b3) of the central tread portion (8a), and the two side portions are thinner than the middle portion and have end portions that gradually taper toward the shoulders of the tread.
11. The vehicle pneumatic tire according to any one of claims 1 to 10, which is a vehicle pneumatic tire for a single-track motor vehicle.
12. The vehicle pneumatic tire of claim 11, which is a motorcycle tire.
13. The vehicle pneumatic tire according to any one of claims 1 to 12, characterized in that: The central tread portion (7a, 8a) is produced from an extruded rubber compound, and the tread portion (7b, 8b) extending over the entire width (b1) of the tread (1) is produced by repeatedly spirally and overlappingly winding strips of extruded rubber compound.
14. A method for producing a pneumatic vehicle tire, the pneumatic vehicle tire comprising a tread (1) having a width (b1) and having a central tread portion (7a, 8a) made of a first rubber material and a tread portion (7b, 8b) made of a second rubber material, the central tread portion extending over a portion of the width (b1) of the tread (1), the tread portion adjoining the first portion, forming a lateral portion of the outer surface of the tread and extending continuously over the entire width (b1) of the tread (1), the first rubber material having a Shore A hardness according to DIN ISO 7619-1 greater than the Shore A hardness of the second rubber material, It is characterized in that The central tread portion (7a, 8a) is formed by a single winding of an extruded rubber compound, and the tread portion (7b, 8b) extending over the entire width (b1) of the tread (1) is formed by repeated spiral and overlapping windings of extruded rubber compound strips.