WO2024255972A1 - Fahrzeugluftreifen - Google Patents
Fahrzeugluftreifen Download PDFInfo
- Publication number
- WO2024255972A1 WO2024255972A1 PCT/DE2024/200043 DE2024200043W WO2024255972A1 WO 2024255972 A1 WO2024255972 A1 WO 2024255972A1 DE 2024200043 W DE2024200043 W DE 2024200043W WO 2024255972 A1 WO2024255972 A1 WO 2024255972A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrically conductive
- tread
- layer
- pneumatic vehicle
- vehicle tire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/08—Electric-charge-dissipating arrangements
- B60C19/082—Electric-charge-dissipating arrangements comprising a conductive tread insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/08—Electric-charge-dissipating arrangements
- B60C19/086—Electric-charge-dissipating arrangements using conductive sidewalls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/08—Electric-charge-dissipating arrangements
- B60C19/088—Electric-charge-dissipating arrangements using conductive beads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C2015/0617—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber
Definitions
- the invention relates to a pneumatic vehicle tire with a profiled tread, a belt assembly, a carcass insert, side walls and horn profiles and at least one discharge path for dissipating electrostatic charges, wherein the discharge path comprises a first electrically conductive partial passage penetrating the tread in the radial direction, a second electrically conductive partial passage adjoining this and running on the inside of the tread, and a third electrically conductive partial passage adjoining the second electrically conductive partial passage, running on the inside of the side wall and contacting the adjacent horn profile.
- Such a pneumatic vehicle tire is known, for example, from
- the tire has a discharge path which is formed from a rubber strip which passes through the tread in the radial direction, a band-shaped, electrically conductive rubber layer running along the inside of the tread and another band-shaped, electrically conductive rubber layer running in the area of the sidewall.
- the rubber layers can each be formed by applying a rubber solution.
- the discharge path formed allows corresponding tire components to be manufactured from rubber mixtures containing silica, which reduces rolling resistance.
- the invention is therefore based on the object of further improving a pneumatic vehicle tire of the type mentioned at the outset while maintaining the required discharge path with regard to rolling resistance.
- the electrically conductive partial passages of the discharge path are vulcanized, electrically conductive layers each with a thickness of at most 0.10 mm.
- the electrically conductive structure (discharge path) implemented in the tire is therefore made of particularly thin layers over its entire extent, which further reduces the amount of electrically conductive material required and thus the rolling resistance.
- the electrically conductive layer which is the third electrically conductive partial passage, runs to the bead sole of the horn profile, wherein the horn profile preferably consists of electrically non-conductive rubber material. This contributes to a further reduction in rolling resistance.
- the electrically conductive layer which is the third electrically conductive partial passage, has an end section that penetrates the horn profile and exits at the bead base of the horn profile or ends at an additional, vulcanized, electrically conductive layer formed on the bead base and belonging to the discharge path, which has a width of in particular up to 5.0 mm in the axial direction. This ensures a particularly short discharge path.
- the additional electrically conductive layer improves contact with the rim.
- the electrically conductive layer which is the third electrically conductive partial passage
- the electrically conductive layer is arranged in sections between the horn profile and the inner layer and over the inner side of the outer surface of the horn profile adjoining the inner layer to the bead toe and preferably also further to the bead sole of the outer surface of the horn profile.
- the electrically conductive layer which is the second electrically conductive partial passage, is vulcanized into the tread on the inside of the tread.
- Such a layer can be easily manufactured.
- the electrically conductive layer which is the third electrically conductive partial passage, is vulcanized into the inside of the side wall and preferably into the inside of the horn profile. Such a layer can also be easily manufactured.
- the radially outer end of the layer which is the first electrically conductive partial passage, is adjoined by an additional layer lying on the outer surface of the tread, vulcanized into the tread and belonging to the discharge path, which has a width of in particular up to 5.0 mm in the axial direction.
- This additional layer contributes to improving the contact of the discharge path with the ground in new or slightly worn tires.
- Fig. 1 schematically shows a partial cross-section of a pneumatic vehicle tire.
- Pneumatic vehicle tires designed according to the invention are tires for motor vehicles, in particular for multi-track motor vehicles, preferably for passenger cars (PCs), vans (transporters), SLIVs or commercial vehicles, and preferably tires of radial design for rims with a rim diameter of 13 inches to 24 inches, in particular from 18 inches to 23 inches.
- Fig. 1 shows one half of a cross-section of a pneumatic vehicle tire, which is a passenger car tire, with a profiled tread 1, a two-layer belt assembly 2, sidewalls 3, bead areas each with a bead core 4 and a bead filler 5, a carcass ply 6, an airtight inner layer 7 and horn profiles 8.
- the tire equatorial plane is marked by a line A-A.
- the pneumatic vehicle tire has at least one discharge path in order to discharge the electrostatic charges that occur during driving from the vehicle, in particular from the body, to the respective ground (“grounding”).
- the discharge path contacts the rim.
- the complete discharge path is formed exclusively from electrically conductive layers 9, 10, 11, 12, 13 that contact one another and each have a thickness of at most 0.10 mm.
- the layers 9, 10, 11, 12, 13 are formed during the vulcanization from an electrically conductive suspension that has previously been applied to the respective tire components, as will be explained in more detail below.
- the electrically conductive suspension is based, for example, on latex or a mineral oil plasticizer in combination with electrically conductive particles, such as soot particles, graphite powder, carbon nanotubes or particles from an electrically conductive rubber mixture, i.e. particles which are obtained by crushing an electrically conductive rubber mixture.
- the proportion of electrically conductive particles in the suspension is, for example, 10 wt.% to 70 wt.%, in particular 30 wt.% to 50 wt.%.
- the amounts of the components of the suspension are coordinated such that the suspension preferably has a dynamic viscosity at 20°C of 1.0 Pa s to 100.0 Pa s, in particular of up to 50.0 Pa s, and preferably of up to 20.0 Pa s.
- a suspension based on mineral oil plasticizer contains, for example, the following components: a) Mineral oil plasticizer: o 300 phr to 800 phr, preferably 500 phr to 700 phr, whereby the mineral oil plasticizer(s) preferably have the following hydrocarbon proportions according to ASTM D 2140 - 08 (2017) (Note: The hydrocarbon proportions are known to be determined from an empirical function which is composed of the viscosity-density relationship and the refractive index):
- Aromatic hydrocarbon content CA 0% to 5%
- BR polybutadiene
- SBR styrene-butadiene rubber
- EPDM ethylene-propylene-diene rubber
- CR chloroprene rubber
- NBR acrylonitrile-butadiene rubber
- accelerator 1.0 phr to 6.0 phr, o in particular thiazoles and/or sulfenamides, preferably exclusively sulfenamides.
- stearic acid 1.0 phr to 6.0 phr.
- carbon black 40 phr to 110 phr, in particular 50 phr to 100 phr, preferably up to 80 phr, o in particular pearled carbon black and/or fluffy carbon black, for example Printex® XE2-B (from Orion Engineered Carbos, BET surface area according to ASTM D 6556: 1000 m 2 /g, DBP number according to ASTM D 2414: 420 ml / 100 g), N 326, N 339 or N 121.
- Printex® XE2-B from Orion Engineered Carbos, BET surface area according to ASTM D 6556: 1000 m 2 /g, DBP number according to ASTM D 2414: 420 ml / 100 g
- the sulfur can come from a sulfur donor system without accelerator effect, for example 4,4'-dithiodimorpholine (DTDM).
- sulfur and accelerator can come from a sulfur donor system with accelerator effect, for example tetramethylthiuram disulfide (TMTD).
- TMTD tetramethylthiuram disulfide
- Table 1 shows exemplary examples of the composition of a mineral oil plasticizer-based suspension.
- the high molecular weight polyisoprene provided has, as is known, a higher molecular weight than the liquid polyisoprene contained.
- the tread 1 is constructed in a single layer, but can also be constructed in multiple layers in the radial direction, contains a profile, has an outer surface 1a located in the tread periphery and is made of electrically non-conductive rubber material.
- the tread 1 is penetrated in the area of the tire's equatorial plane in the radial direction by an electrically conductive layer 9.
- the layer 9 can run in the circumferential direction or be distributed over the circumference in points or sections and thus forms a single-part or multi-part, electrically conductive partial passage. If the electrically conductive partial passage is multi-part, it is designed in such a way that when the tire rolls, at least part of the electrically conductive partial passage is in the ground contact area.
- the ground contact area corresponds, as is known, to the statically determined footprint (determined with a tire mounted on a standard rim, load at 70% of the maximum load capacity, internal pressure 85% of the standard pressure, in accordance with ETRTO standards).
- the radially outer end of the layer 9 is adjoined by a layer 12 vulcanized into the outer surface 1a of the tread 1, which has a width of in particular up to 5.0 mm in the axial direction.
- a raw tread is extruded from a rubber mixture (single-part tread) or from several rubber mixtures (multi-part tread), as is known per se.
- the raw tread is cut into two raw tread parts and an electrically conductive suspension is applied to at least one of the cut surfaces to form the layer 9, at least in sections, over the entire height of the cut surface.
- an electrically conductive suspension is applied to form the layer 12.
- the raw tread parts are then joined together.
- the raw tread parts can be extruded separately, with at least one of the surfaces over which the raw tread parts are joined together being coated with an electrically conductive suspension.
- the electrically conductive suspension is applied at least in sections over the entire height of the surface.
- electrically conductive suspension is also applied to form layer 12.
- the belt bandage 2 consists of a radially inner belt layer 2a and a radially outer belt layer 2b, wherein the belt layers 2a, 2b each consist of strength members, for example made of steel or textile cords of known construction, embedded in an electrically non-conductive belt rubber coating and running parallel to one another in each belt layer 2a, 2b, wherein the strength members of the radially inner belt layer 2a cross those of the radially outer belt layer 2b in a particularly known manner.
- the belt layers 2a, 2b can be covered with a belt bandage which consists of strength members, generally textile, preferably made of nylon or polyester, embedded in an electrically non-conductive bandage rubber coating.
- an electrically conductive layer 10 which is formed on the inside of the tread 1 and vulcanized into it, which makes contact with the electrically conductive layer 9, runs from the layer 9 over one half of the tread in the direction of the tire shoulder and forms a second electrically conductive partial passage.
- the electrically conductive suspension is applied to that side of the green tread or one green tread half which forms or co-forms the inside of the tread 1 in the pneumatic vehicle tire, such that it contacts the suspension applied to the cutting surfaces of the green tread parts.
- the side walls 3 consist of an electrically non-conductive rubber material and overlap the horn profiles 8 on the outside of the tire.
- the carcass insert 6 runs in a manner known per se between the belt assembly 2 and the inner layer 7 and between the side walls 3 and the inner layer 7 and is folded over around the bead cores 4 from the inside to the outside, forming carcass folds 6a.
- the carcass insert 6 consists of an electrically non-conductive carcass rubber coating and strength elements embedded in it.
- the inner layer 7 consists of an electrically non-conductive rubber material and is designed in a manner known per se.
- the horn profiles 8 are also made of an electrically non-conductive rubber material and each have an outer surface 8a running between the inner layer 7 and the respective side wall 3, which is composed of an inner side 8ai running towards the inner layer 7, a bead sole 8a2, a bead heel 8as and an outer side 8a4 running towards the corresponding side wall 3, wherein the inner side 8ai and the bead sole 8a2 are connected to one another via a bead toe 8as.
- the bead sole 8a2 runs straight when viewed in cross section or is composed of several straight sections when viewed in cross section.
- the bead heel 8as runs, when viewed in cross section, curved outwards (arc-shaped) at least over a section immediately adjacent to the bead sole 8a2 and in particular curved outwards throughout.
- An electrically conductive layer 11 is formed in the side wall area, which runs between the side wall 3 and the carcass insert 6 and between the horn profile 8 and the bead filler 5 or between the horn profile 8 and the carcass turn-up 6a.
- the layer 11 contacts the layer 10 and penetrates the horn profile 8 with an end section 11a in such a way that the layer 11, i.e. the end section 11a, emerges from the bead sole 8a2 or, as shown in the embodiment, ends at a layer 13 formed on the bead sole 8a2.
- the layer 11 forms a third electrically conductive partial passage, is vulcanized into the side wall 3 and the horn profile 8 and is - with the exception of the End section 11a - on the inner sides of the side wall 3 and the horn profile 8.
- the layer 13 is vulcanized into the horn profile 8 and has a width of in particular up to 5.0 mm in the axial direction.
- electrically conductive suspension is applied to that side of the co-extruded sidewall/horn profile which forms or co-forms the inside of the sidewall 3 or the horn profile 8 in the pneumatic vehicle tire, whereby to produce the end section 11a, the extruded horn profile is cut open, electrically conductive suspension is applied and the horn profile is reassembled.
- electrically conductive suspension is applied to the reassembled horn profile at the appropriate point.
- the tread 1, the belt rubber coating of the belt layers 2a, 2b, the sidewall 3, the carcass rubber coating of the carcass insert 6, the inner layer 7 and the horn profiles 8 are made of electrically non-conductive rubber material.
- the rubber mixtures on which these components are based therefore contain correspondingly large amounts of silica. As is known, this measure is advantageous for the rolling resistance of the tire as well as for the cut and crack resistance of the respective tire component.
- electrically conductive particles “electrically conductive rubber material”, “electrically conductive layers” and “electrically conductive partial passages” are understood to mean those which have a specific electrical resistance of ⁇ 10 8 Ohm cm.
- the layers 12 and 13 are optional.
- the electrically conductive layer 11 does not have to pass through the horn profile 8, but can be between the horn profile 8 and the inner layer 7 and then over the inner side 8ai of the outer surface 8a of the horn profile 8 to the bead toe 8as and optionally further to the bead sole 8a2.
- the end section 11 a is omitted in this embodiment.
- the horn profile 8 can consist of electrically conductive rubber material, wherein the layer 11 ends at any point in contact with the horn profile 8 and the horn profile 8 is thus part of the discharge path.
- A-A line (tire equatorial plane)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24728490.4A EP4727780A1 (de) | 2023-06-13 | 2024-05-15 | Fahrzeugluftreifen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023205466.3A DE102023205466A1 (de) | 2023-06-13 | 2023-06-13 | Fahrzeugluftreifen |
| DE102023205466.3 | 2023-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024255972A1 true WO2024255972A1 (de) | 2024-12-19 |
Family
ID=91274581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2024/200043 Ceased WO2024255972A1 (de) | 2023-06-13 | 2024-05-15 | Fahrzeugluftreifen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4727780A1 (de) |
| DE (1) | DE102023205466A1 (de) |
| WO (1) | WO2024255972A1 (de) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004268863A (ja) * | 2003-03-12 | 2004-09-30 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
| DE602005004481T2 (de) | 2004-11-18 | 2009-01-22 | Société de Technologie Michelin | Elektrisch leitender Gummistreifen |
| EP2487052B1 (de) * | 2011-02-10 | 2013-12-11 | Toyo Tire & Rubber Co., Ltd. | Luftreifen und Herstellungsverfahren für den Luftreifen |
| EP2500188B1 (de) * | 2011-03-17 | 2014-02-26 | Toyo Tire & Rubber Co. Ltd. | Luftreifen |
| DE102013113935B4 (de) * | 2012-12-25 | 2018-05-30 | Toyo Tire & Rubber Co., Ltd. | Luftreifen |
-
2023
- 2023-06-13 DE DE102023205466.3A patent/DE102023205466A1/de active Pending
-
2024
- 2024-05-15 EP EP24728490.4A patent/EP4727780A1/de active Pending
- 2024-05-15 WO PCT/DE2024/200043 patent/WO2024255972A1/de not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004268863A (ja) * | 2003-03-12 | 2004-09-30 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
| DE602005004481T2 (de) | 2004-11-18 | 2009-01-22 | Société de Technologie Michelin | Elektrisch leitender Gummistreifen |
| EP2487052B1 (de) * | 2011-02-10 | 2013-12-11 | Toyo Tire & Rubber Co., Ltd. | Luftreifen und Herstellungsverfahren für den Luftreifen |
| EP2500188B1 (de) * | 2011-03-17 | 2014-02-26 | Toyo Tire & Rubber Co. Ltd. | Luftreifen |
| DE102013113935B4 (de) * | 2012-12-25 | 2018-05-30 | Toyo Tire & Rubber Co., Ltd. | Luftreifen |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102023205466A1 (de) | 2024-12-19 |
| EP4727780A1 (de) | 2026-04-22 |
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