Tyre, tyre processing machine, method, foam component and use

Abstract

Disclosed is a tyre (100) comprising a foam component (104) on an inner surface (102) of the tyre (100), the foam component (104) comprising: a closed surface part (106); and a foam body (110) which provides a restoring force against deformation of the closed surface part (106); wherein the foam component (104), in particular the closed surface part (106), is excitable to vibrations of < 1000 Hz by airborne sound. Furthermore, a method for fitting a tyre (100) with such a foam component (110), a corresponding foam component (110) and a tyre processing machine are disclosed.

Description

[0001] Our reference: J 1727 WO

[0002] TIRES, TIRE PROCESSING MACHINE, PROCESS, FOAM COMPONENT AND USE

[0003] TECHNICAL AREA

[0004] The present disclosure relates to the field of tires which incorporate a foam for noise reduction.

[0005] BACKGROUND

[0006] DE 20 2023 107 514 Ul discloses an assembly comprising a component, for example a pneumatic tire; a foam which is attached to the component by applying a precursor of the foam to the component and converting the precursor to produce the foam; in particular wherein the foam has an open-pore surface which faces away from the component.

[0007] SUMMARY

[0008] Given the situation described above, there may be a need for a technology that allows for the provision of a tire with improved characteristics and a method for its manufacture.

[0009] This need can be met by the independent claims. Some advantageous embodiments are specified in the dependent claims.

[0010] MW:mb According to a first aspect of the items disclosed herein, a tire is provided.

[0011] According to one embodiment of the first aspect, a tire is provided which has a foam component on an inner surface of the tire, the foam component comprising: a closed surface part; a foam body which provides a restoring force against deformation of the closed surface part; wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound.

[0012] According to a second aspect of the items disclosed herein, a procedure is provided.

[0013] According to an embodiment of the second aspect, a method is provided comprising equipping an inner surface of a tire with a foam component, the foam component comprising: a closed surface part; a foam body, which provides a restoring force against deformation of the closed surface part; wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound.

[0014] According to a third aspect of the items disclosed herein, two tires are provided.

[0015] According to one embodiment of the third aspect, two tires of the same type are provided, each of which is a tire according to the first aspect, and of which a first tire has a first effective circumference and of which a second tire has a second effective circumference which is larger than the first effective circumference; wherein the effective circumference is calculated as the arithmetic mean of a rim seat circumference and a tread circumference of the tire in question; wherein the foam component of the first tire is capable of being excited to vibrations at higher frequencies than the foam component of the second tire.

[0016] According to a fourth aspect of the items disclosed herein, a foam body is provided.

[0017] According to one embodiment of the fourth aspect, a foam component is provided which has a closed surface part and a foam body which provides a restoring force against deformation of the closed surface part; wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound; in particular wherein the foam body is obtainable by a reaction of an isocyanate-containing component with a polyol-containing component; and wherein the polyol-containing component comprises at least one of the following: (i) polyether polyols with a proportion of at least 50 wt.% polypropylene glycol, based on the polyether polyols; (ii) polybutylene glycol; (iii) 0 wt.% - 30 wt.% hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component; polyether polyol copolymer, in particular based on a molar fraction of at least 50% of the comonomer propylene glycol.

[0018] A use is provided in accordance with a fifth aspect of the items disclosed herein.

[0019] According to one embodiment of the fifth aspect, the use of an isocyanate-containing component and a polyol-containing component for the production of a foam body, in particular a foam body of a foam component in a tire, is provided; wherein the foam component has a closed surface part; wherein the foam body provides a restoring force against deformation of the closed surface part; wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound; and wherein the polyol-containing component comprises at least one of the following: (i) polyether polyols with a proportion of at least 50 wt.% polypropylene glycol, based on the polyether polyols; (ii) polybutylene glycol; (iii) 0 wt.% - 30 wt.% hydroxyl-terminated homopolymers of butadiene, based on the polyol-containing component; polyether polyol copolymer, in particular based on a mole fraction of min.50% of the comonomer propylene glycol.

[0020] According to a sixth aspect of the items disclosed herein, a tire processing machine is provided.

[0021] According to one embodiment of the sixth aspect, a tire processing machine is provided, the tire processing machine comprising an application device for applying a foam precursor of a foam body to an inner surface of a tire, wherein the foam precursor is convertible into a foam body of a foam component for equipping the inner surface with a foam component comprising the foam body; wherein the tire processing machine is configured to produce the foam component with a closed surface part, the foam body providing a restoring force against deformation of the closed surface part; and wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound. DESCRIPTION OF EXEMPLARY EMBODYFATHERS

[0022] Even though certain disadvantages of earlier technologies are mentioned herein, the claimed subject matter is not to be limited to implementations that overcome some or all of the mentioned disadvantages of the earlier technologies. Furthermore, even though certain advantages of the subject matter disclosed herein are mentioned or implied in the present disclosure, the claimed subject matter is not to be limited to implementations that exhibit some or all of these advantages.

[0023] Exemplary embodiments of the items disclosed herein are described below, with reference to, for example, a method, a tire, two tires, a foam body, an use, and a tire-processing machine. It should be emphasized that, of course, any combination of features of different aspects, embodiments, and examples is possible. In particular, some embodiments are described with reference to a method, while other embodiments are described with reference to a tire. Still other embodiments are described with reference to a tire-processing machine, while other embodiments are described with reference to a control device for interacting with elements of the tire-processing machine.However, the person skilled in the art will understand from the foregoing and following descriptions, the claims, and the drawings that, unless otherwise stated, features of different aspects, embodiments, and examples can be combined, and such combinations of features are to be considered disclosed herein. For example, even a feature relating to a method can be combined with a feature relating to a device or a tire, and vice versa. Exemplary implementations of the items disclosed herein include, in particular, one or more of the embodiments and combinations of embodiments described herein.

[0024] According to one embodiment, a tire according to the first aspect is a tire which has a foam component on an inner surface of the tire.

[0025] According to one embodiment, a method according to the second aspect is a method which includes equipping an inner surface of a tire with a foam component, in particular for producing the foam component by introducing a foam precursor into the tire and converting the foam precursor in the tire (in situ production).

[0026] According to one embodiment, a foam component according to the fourth aspect is a foam component according to embodiments of the items disclosed herein. According to one embodiment, the foam body is obtainable by a reaction of an isocyanate-containing component and a polyol-containing component.

[0027] According to one embodiment, the foam precursor has an isocyanate-containing component and a polyol-containing component.

[0028] According to one embodiment, a use according to the fifth aspect is a use of an isocyanate-containing component and a polyol-containing component for the manufacture of a foam component according to embodiments of the items disclosed herein.

[0029] According to one embodiment, the foam component has a surface part, for example, a closed surface part. According to another embodiment, the foam component has a foam core which provides a restoring force against deformation of the closed surface part. According to a further embodiment, the foam component can be excited to vibrations below 1000 Hertz (< 1000 Hz) by airborne sound.

[0030] For example, the surface part can be excited to vibrations below 1000 Hz by airborne sound.

[0031] According to one embodiment, the polyol-containing component has at least one of the following:

[0032] Polyether polyol;

[0033] Polypropylene glycol;

[0034] at least two polyether polyols with a proportion of at least 50 wt.% polypropylene glycol, based on the total polyether polyol;

[0035] Polybutylene glycol;

[0036] at least one hydroxyl-terminated homopolymer of butadiene; at least one hydroxyl-terminated homopolymer of butadiene, wherein the total hydroxyl-terminated homopolymer of butadiene has a content of 0 wt. % - 30 wt. % based on the polyol-containing component;

[0037] Polyether polyol copolymer, in particular based on a mole fraction of min. 50% of the comonomer propylene glycol.

[0038] The abbreviation wt. % here refers, as usual, to a proportion in weight percent / mass percent.

[0039] According to one embodiment, the isocyanate-containing component comprises at least one of toluene-2,4-diisocyanate (TDI) and diphenylmethane-4,4'-diisocyanate (MDI).

[0040] According to one embodiment, two tires of the third aspect are two tires of the same type, for example, of the same brand and / or from the same manufacturer. According to another embodiment, two tires of the third aspect (for example, a first tire and a second tire) are two tires according to the first aspect, i.e., each of the two tires is designed according to the first aspect (or at least one embodiment of the first aspect). For example, each of the first tire and the second tire has a foam component with a closed surface part and a foam core that provides a restoring force against deformation of the closed surface part, wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound.

[0041] According to one embodiment, the first tire has a first effective circumference, and the second tire has a second effective circumference that is larger than the first effective circumference. According to one embodiment, an effective circumference is the arithmetic mean of the rim seat circumference and the tread circumference of the tire in question.

[0042] According to another embodiment, the foam component of the first tire is susceptible to vibrations at higher frequencies than the foam component of the second tire. In other words, the foam component of the second tire (i.e., the tire with the larger effective circumference) is susceptible to vibrations at lower frequencies than the foam component of the first tire.

[0043] According to one embodiment, a tire processing machine, as described in the sixth aspect, includes an application device. In one embodiment, the application device is configured to apply a foam precursor of a foam body to an inner surface of a tire. In another embodiment, the foam precursor can be converted into a foam body of a foam component, for example, to equip the inner surface of the tire with a foam component that includes the foam body. In a further embodiment, the tire processing machine is configured to produce the foam component with a closed surface section, wherein the foam body provides a restoring force against deformation of the closed surface section. In another embodiment, the foam component can be excited to vibrations below 1000 Hz by airborne sound.For example, according to one embodiment, the closed surface part can be excited to vibrations of less than 1000 Hz by airborne sound.

[0044] At least some aspects and embodiments of the items disclosed herein are based on the idea that the absorption of sound, particularly airborne sound, in a tire can be improved by a foam component having a closed surface portion that can be excited to vibrations below 1000 Hz. For example, according to one embodiment, the absorption of airborne sound in a tire can be improved by a foam component having a closed surface portion, wherein the closed surface portion can be excited to vibrations below 1000 Hz. According to one embodiment, configuring the surface as a closed surface, i.e., as a closed surface portion, allows for excitation to vibrations below 1000 Hz. However, a closed surface portion is not required in one embodiment.According to one embodiment, the term "closed surface part" is therefore interchangeable with the term "surface part which can be excited to vibrations below 1000 Hz".

[0045] According to one embodiment, the excitability to vibrations leads to increased absorption / dissipation of airborne sound and therefore manifests itself, according to another embodiment, in an increased absorption coefficient (also referred to as absorption coefficient) at low frequencies, which is characteristic of a foam component according to embodiments of the items disclosed herein. A change in the vibration spectrum consequently also changes the absorption spectrum of the foam component. According to one embodiment, the term "vibration spectrum" used herein can therefore be used interchangeably with the term "absorption spectrum," where applicable, resulting in corresponding embodiments that refer to the absorption spectrum of the foam component.

[0046] Providing a foam component with characteristics according to the embodiments disclosed herein can enable better damping of sound, in particular airborne sound, which arises during the operation of a tire.

[0047] According to one embodiment, the foam component can be excited by airborne sound to vibrations below 500 Hz, for example, to vibrations below 300 Hz. For example, according to one embodiment, the foam component can be excited by airborne sound to vibrations below 250 Hz.

[0048] According to one embodiment, the closed surface portion can be excited to vibrations by airborne sound. For example, the closed surface portion can be excited to vibrations below 500 Hz by airborne sound, for example, to vibrations below 300 Hz. For example, according to one embodiment, the closed surface portion can be excited to vibrations below 250 Hz by airborne sound.

[0049] According to one embodiment, the closed surface portion at least partially separates the foam body (particularly in a direction perpendicular to the closed surface portion) from the surrounding air mass (i.e., from the atmosphere (e.g., the ambient air) surrounding the foam body). According to another embodiment, the closed surface portion is configured such that, when a pressure wave (for example, a sound wave) strikes the closed surface portion, gas exchange is prevented between a first side of the closed surface portion, on which the pressure wave strikes, and a second side of the closed surface portion, which faces away from the first side. For example, according to one embodiment, a pressure wave striking the closed surface portion is reflected, particularly partially reflected, and not transmitted or only partially transmitted.According to one embodiment, a pressure wave impacting the closed surface section is prevented from penetrating the foam body by the closed surface section itself. According to another embodiment, a pressure wave impacting the closed surface section causes it to deform. This deformation can, of course, lead to a pressure increase within the foam body. However, this is then a consequence of the deformation of the closed surface section and not a consequence of the pressure wave being transmitted through it. In particular, according to one embodiment, the closed surface section can be an airtight surface section, for example, a surface section that seals the foam body airtight from the ambient air.

[0050] According to one embodiment, the closed surface portion separates the foam body from the surrounding atmosphere and / or covers at least four pores. For example, the closed surface portion covers at least two pores in each of two mutually perpendicular directions, with the covered pores being interconnected. According to another embodiment, the closed surface portion covers at least three pores in each of two mutually perpendicular directions, or at least four pores, for example, with a total coverage of at least nine pores or at least sixteen pores. According to one embodiment, the closed surface portion prevents the pore structure from being seen with the naked eye.According to another embodiment, “closed surface part” means that the roughness Ra (average roughness) of the surface of the foam component over a square area with a side length three times the mean pore size of the foam body is less than 10% of the mean pore size of the foam body.

[0051] According to another embodiment, deformation of the closed surface portion performs deformation work, which is partially converted into heat by the foam body and is therefore no longer available for reflection (damping of the vibration). This is particularly the case when the foam body has a high loss modulus.

[0052] According to one embodiment, the closed surface portion is free of openings. In other words, according to one embodiment, the closed surface portion is at least a part of the surface of the foam component that is closed, i.e., free of openings.

[0053] According to one embodiment, the foam component is arranged opposite a tread surface of the tire. According to another embodiment, the foam component is connected to the inner surface, for example by positive locking and / or chemical bonding.

[0054] According to one embodiment, the foam body has at least one physical property that changes in a direction perpendicular to the inner surface (for example, in the radial direction). In other words, the foam body has a profile for the at least one physical property in the radial direction. According to one embodiment, a change in the at least one physical property in the radial direction is achieved by setting a temperature profile in the radial direction during the conversion of the foam precursor into the resulting foam body.

[0055] According to one embodiment, the at least one physical property comprises at least one of an elastic modulus, a loss modulus, a density, a Shore hardness and a pore size.

[0056] According to one embodiment, a first section of the foam body, which borders the closed surface portion, has a higher modulus of elasticity and / or a higher density than a second section of the foam body, which is located between the first section and the inner surface of the tire. According to another embodiment, the first section of the foam body has a lower modulus of elasticity than the second section of the foam body. According to yet another embodiment, the first section of the foam body has a lower density than the second section of the foam body.

[0057] Due to a relatively low modulus of elasticity and / or a relatively high density of the first section (especially relative to the second section), vibration excitation of the closed surface part in a frequency range (for example, at low frequencies) may be increased, thereby improving the absorption of airborne sound in this frequency range.

[0058] According to one embodiment, the foam body has at least two different phases with different mechanical and / or chemical properties. For example, according to one embodiment, the at least two different phases extend parallel to the inner surface. By having at least two different phases of the foam body, the mechanical properties of the foam body, in particular the restoring force against deformation of the closed foam body, can be adjusted. In particular, according to one embodiment, the foam body can be configured such that the restoring force is non-linear with respect to the deformation of the closed surface portion.

[0059] According to one embodiment, the ratio of loss modulus G" to elastic modulus G' is greater than 0.1, i.e., G" / G' > 0.1. According to another embodiment, G" / G' > 0.2, for example, G" / G' > 0.3 or G" / G' > 0.6. According to yet another embodiment, G" / G' > 0.8. According to yet another embodiment, G" / G' is less than or equal to 1 (G" / G' < 1). A high ratio of loss modulus to elastic modulus allows for good damping of the vibration of the closed surface portion. For example, according to one embodiment, good damping of the vibration can be achieved by dissipating the vibrational energy into the foam body.

[0060] According to one embodiment, the foam body is dimensionally stable. In other words, the foam body retains its external dimensions unchanged over relevant periods. For example, according to one embodiment, the foam body is dimensionally stable for at least two years at 20 °C.

[0061] According to one embodiment, the glass transition temperature (also known as the glass temperature) of the foam body is below 0 °C. For example, the glass transition temperature is below -20 °C, for example below -40 °C.

[0062] According to one embodiment, the foam component has a Shore hardness between 15 and 65. In another embodiment, the Shore hardness is measured on the closed surface portion. According to a further embodiment, the mean pore size of the foam body is between 30 pm and 1000 pm. For example, the mean pore size of the foam body is between 100 pm and 400 pm. According to one embodiment, the modulus of elasticity G', for example, measured on the closed surface portion, is between 3 kPa and 8 kPa (kilopascals), for example, between 5 kPa and 7 kPa, for example, 6 kPa (= 0.006 MPa).

[0063] According to one embodiment, the foam component has an open surface portion. In another embodiment, the open surface portion is an open-pored surface portion of the foam body. In yet another embodiment, the open surface portion is configured such that ambient air can penetrate the foam body when a pressure wave (for example, a sound wave) impinges upon it.

[0064] For example, according to one embodiment, a pressure wave striking the open surface part is transmitted (into the foam body).

[0065] According to one embodiment, airborne sound is absorbed by exciting the closed surface part to vibrations which are dampened by the foam body, and according to another embodiment, additionally by allowing sound waves to penetrate the foam component (for example, the foam body) through the open surface part and be dampened there.

[0066] According to one embodiment, an open surface part is a non-closed surface part. In other words, an open surface part is defined by the fact that it does not have the properties of a closed surface part.

[0067] According to one embodiment, the foam component has a plurality of depressions. For example, according to another embodiment, the foam component has a plurality of depressions extending over more than 10% of the thickness of the foam component, for example, over more than 30%, more than 50%, or more than 70%. For example, according to one embodiment, the foam component has a plurality of depressions extending over more than 90% of the thickness of the foam component. According to another embodiment, the foam component has a plurality of depressions extending over the entire thickness of the foam component—in other words, in this case, a depression extends to the inner surface. According to one embodiment, the thickness is measured in a direction perpendicular to the inner surface.

[0068] According to another embodiment, the thickness is measured in the radial direction. According to one embodiment, the thickness of the foam component is less than 3 cm (centimeters), for example, less than 2 cm or less than 1.5 cm. According to another embodiment, the thickness of the foam component is less than 1 cm, for example, less than 0.5 cm. According to one embodiment, the thickness of the foam component is between 0.5 cm and 4 cm, for example, between 1 cm and 4 cm. According to another embodiment, the thickness of the foam component is between 1.5 cm and 3 cm.

[0069] According to another embodiment, the recesses have a diameter between 100 pm (micrometers) and 1 cm, for example between 300 pm and 3 mm. For example, according to one embodiment, the diameter of the recesses is between 500 pm and 2 mm.

[0070] According to one embodiment, the recesses are produced by laser processing. According to another embodiment, a wall of the recesses forms an open surface part according to embodiments of the objects disclosed herein.

[0071] According to one embodiment, the tire has an effective circumference Ueff, which is calculated as the arithmetic mean of a rim seat circumference UF and a tread circumference UL of the tire, i.e., Ueff = (UF + UL) / 2. The literature specifies the effective radius r associated with the effective circumference Ueff. e ff, also referred to as mean cavity radius, Ueff = 2*pi*r e ff. Here, * denotes multiplication and pi is the mathematical constant, also denoted by the Greek letter TT. This is because the tire, together with the rim, forms a cavity in which vibrations of airborne sound can develop. According to another embodiment, the tire has a calculated natural frequency f. aE of a cavity vibration, where the calculated natural frequency f a E is calculated by dividing the speed of sound at 20 °C in dry air by the effective circumference, where the speed of sound is 343.5 m / s (CL = 343.5 m / s). It is understood that higher modes can also occur in the cavity, which are an integer multiple of the cavity vibration f. aE are.

[0072] Thus, the general frequency fi of the i-th cavity resonance is obtained.

[0073] fi = i *Ci / (2*pi*r e ff) = i*Ci / Ueff

[0074] As explained above, the first cavity resonance fi = CL / Ueff is calculated here as the natural frequency f. aE denoted (fi,E = fi). For an exemplary effective perimeter of Ueff = 1.5 m, a calculated natural frequency of f results. a E = 229 Hz.

[0075] It is understood that the calculated natural frequency can only be an estimate of the tire's actual natural frequency. The actual natural frequency depends, among other things, on the exact geometry of the cavity, the air pressure, the humidity, and the temperature. Furthermore, tire deformation under load and rotation also influence the actual natural frequency. However, the calculated natural frequency is close enough to the tire's actual natural frequency to serve, according to one embodiment, as a measure for adjusting the foam properties.

[0076] According to one embodiment, the foam component exhibits a vibration spectrum, the vibration spectrum of which overlaps with a resonance spectrum of the tire. In other words, the foam component can be excited to at least one vibration whose frequency coincides with a frequency of a (resonant) cavity vibration of the tire. According to one embodiment, the resonance spectrum of the tire has at least one resonance frequency that deviates from the calculated natural frequency by less than 20 Hz (for example, by less than 10 Hz).

[0077] According to one embodiment, the foam component has a vibration spectrum, wherein the vibration spectrum of the foam component overlaps with the calculated natural frequency of the tire.

[0078] If two tires of the same brand but different circumferences are considered, according to one embodiment, each of the two tires defines a calculated natural frequency f.aE of a cavity vibration, wherein the calculated natural frequency is determined by dividing the speed of sound at 20 degrees in air by the effective circumference of the tire in question, where the speed of sound is 343.5 m / s. According to one embodiment, the foam component of the first tire can be excited to vibrations whose frequency is higher than the vibrations to which the second tire can be excited by more than half the difference between the calculated natural frequency of the first tire and the calculated natural frequency of the second tire. For example, the foam component of the first tire can be excited to vibrations whose frequency is higher than the vibrations to which the second tire can be excited by more than 80% of the difference (for example, 100%) between the difference between the calculated natural frequency of the first tire and the calculated natural frequency of the second tire.Consequently, according to one embodiment, the foam component's vibration behavior is adapted to the calculated natural frequency.

[0079] According to one embodiment, the foam component of the first tire has a first foam body, and the foam component of the second tire has a second foam body, wherein the first foam body and the second foam body are formed from the same foam precursor. In other words, according to one embodiment, a change in a vibration spectrum or absorption spectrum of the foam component is not caused by a change in the foam precursor, but, for example, by other process parameters such as at least one of (i) the temperature of the foam precursor; (ii) the temperature of the tire; (iii) the rotational speed of the tire during the conversion of the foam precursor into the foam, etc., for example, as described herein.

[0080] According to one embodiment, the foam component has an absorption spectrum which has at least one of the following features (a) to (e):

[0081] (a) The absorption spectrum increases on average in the frequency range between 100 Hz and 1000 Hz.

[0082] (b) A mean absorption coefficient in the range between f a E - 25 Hz and f a E + 25 Hz is at least 1.4 times higher than a mean absorption coefficient in the range between 100 and f a E - 25 Hz. According to one implementation, the mean absorption coefficient is in the range between faE - 25 Hz and f a E + 25 Hz at least by a factor of 1.6 (for example at least by a factor of 1.8) higher than a mean absorption coefficient in the range between 100 Hz and faE - 25 Hz.

[0083] (c) In the absorption spectrum, a moving average slope of the absorption spectrum over a range of 25 Hz increases by more than 50% in the frequency range between 100 Hz and faE minus 25 Hz, for example by more than 70% or more than 100%. For example, in the absorption spectrum, a moving average slope of the absorption spectrum over a range of 25 Hz increases by more than 50% in the frequency range between 150 Hz and faE minus 50 Hz, for example by more than 70% or more than 100%.

[0084] (d) In the absorption spectrum, the slope of the absorption spectrum within a frequency range of 50 Hz increases by at least 50% (i.e., by a factor of 1.5), particularly where the frequency range is below 500 Hz. According to a further embodiment, the slope of the absorption spectrum within a frequency range of 50 Hz increases by at least a factor of 1.8, for example, by at least a factor of 2.5.

[0085] (e) The absorption spectrum is measured in an impedance tube with a sample, which is a cylindrical part of the foam component with a diameter of 2 inches. According to one embodiment, the cylindrical part of the foam component is extracted from the foam component in a radial direction or in a direction perpendicular to the inner surface.

[0086] According to another embodiment, the absorption spectrum can be measured using any suitable measurement method, for example, as described herein. As used herein, the term "absorption spectrum" refers, according to one embodiment, to a frequency-dependent absorption coefficient, for example, a plot of the absorption coefficient against frequency. The (sound) absorption coefficient a is also referred to as the sound absorption coefficient and, according to one embodiment, is defined as the ratio of the absorbed sound intensity I to the absorbed sound intensity I. a The total incident sound intensity Io, a = Ia / Io. The absorption coefficient therefore varies between 0 and 1, or between 0% and 100%, where 0% corresponds to complete reflection and 100% to complete absorption (0% reflection) of the incident sound. Measurement and evaluation can be carried out, for example, according to ISO 10534-2.

[0087] According to one embodiment, an absorption spectrum according to one or more of the above points (a) to (e) is an averaged absorption spectrum averaged over at least two measurements, for example, four measurements. Furthermore, according to one embodiment, the resulting frequency-dependent absorption coefficient is averaged over a sweep, for example, over 1 / 12 octave.

[0088] According to one embodiment, the closed surface portion is formed by a skin of the foam body. For example, according to one embodiment, the foam body in the tire is formed by applying a foam precursor to the inner surface of the tire and converting the foam precursor into a foam, wherein a surface of the foam that is in contact with the ambient air forms the skin. According to another embodiment, a portion of the foam lying beneath the skin forms the foam body according to embodiments of the articles disclosed herein.

[0089] According to one embodiment, the skin thickness is between 50 pm and 1500 pm, for example between 100 pm and 800 pm. According to another embodiment, the skin thickness is between 200 µm and 600 µm.

[0090] According to one embodiment, the closed surface portion is structured and only partially covers the foam body. For example, it may be provided that the skin (which, according to one embodiment, is formed during the reaction of the foam precursor) is partially removed to form an open surface portion. According to one embodiment, the remaining skin forms the closed surface portion according to embodiments of the articles disclosed herein.

[0091] According to one embodiment, the closed surface portion is structured such that it can be excited to a vibration that deviates by less than 20 Hz (for example, less than 10 Hz or, according to another embodiment, less than 5 Hz) from a resonance frequency of the tire, for example, the calculated natural frequency faE. According to a further embodiment, the closed surface portion is structured such that damping is achieved both through vibration excitation of the closed surface portion and through damping by the open surface portion.

[0092] According to one embodiment, the frequency of the vibration to which the closed surface part can be excited and / or the degree of damping of airborne sound provided by the foam component depends on at least one of the following: the dimensions of the closed surface part, the shape of the closed surface part, the restoring force provided by the foam body, an elastic modulus of the foam component measured at the closed surface part, and a loss modulus of the foam component measured at the closed surface part. According to one embodiment, the foam component has a density gradient in the radial direction, in particular a density that increases in the direction of the axis of rotation.In other words, in one embodiment, a section of the foam body which is located adjacent to the closed surface part (hereinafter also referred to as the first section of the foam body) has a higher density than a section of the foam body which is located between the first section and the inner surface (hereinafter also referred to as the second section of the foam body).

[0093] According to another embodiment, the foam component has a density that decreases towards the axis of rotation (of the tire). Reducing the density of the foam component near the closed surface area can improve damping at low frequencies of airborne sound, particularly at frequencies below 500 Hz, for example, below 300 Hz.

[0094] According to one embodiment, the foam component has a gradient of pore size in the radial direction, in particular a pore size that decreases towards a tire rotation axis. According to one embodiment, a density gradient, as described above, is achieved by a gradient of pore size. For example, according to one embodiment, a reduced pore size leads to a higher density. Conversely, a larger pore size can lead to a lower density. By adjusting the pore size (for example, by suitable process conditions such as an ambient temperature or a foam precursor temperature), a (location-dependent) density of the foam component can therefore be achieved, according to one embodiment.

[0095] According to one embodiment, the ambient temperature, the temperature of the foam precursor, and the energy released during the conversion of a foam precursor into a foam all contribute to a location-dependent temperature distribution in the foam component, in particular to a temperature varying in the radial direction. In this way, by appropriately selecting an ambient temperature (during the conversion of the foam precursor into the foam), a gradient of pore size and / or a density gradient in the radial direction can be adjusted over a wide range, according to one embodiment, for the realization of embodiments of the items disclosed herein.

[0096] According to one embodiment, the foam component has a gradient of an elastic constant in the radial direction, in particular a gradient of an elastic modulus. According to another embodiment, the foam component can have a gradient of a loss modulus in the radial direction.

[0097] According to a further embodiment, the foam component has a gradient in the open porosity of the foam body, in particular an increasing proportion of closed pores in the direction of the tire's axis of rotation. In one embodiment, this can favor or promote the formation of the closed surface area.

[0098] According to one embodiment, the foam body has an average density of between 15 kg / m³. 3 (kilograms per cubic meter) and 300 kg / m³ 3 , for example between 30 kg / m² 3 and 90 kg / m² 3

[0099] According to one embodiment, the foam component comprises a material containing at least one filler. For example, according to one embodiment, the foam component is made of a material containing at least one filler. A filler can be, for example, a filler commonly used in the manufacture of plastics. For example, the filler can be a mineral filler, such as a mineral powder. According to one embodiment, the filler is used to adjust the mechanical properties of the foam component.

[0100] According to another embodiment, the foam component has a basis weight of 2 mg / cm² in a 1 mm (millimeter) thick layer, measured from a surface (of the foam component), for example measured from the closed surface part. 2 (milligrams per square centimeter) up to 30 mg / cm² 2for example, a basis weight between 4 mg / cm² 2 and 10 mg / cm² 2 The term "layer" here is not to be understood restrictively with regard to the structure or composition of the layer, but merely refers to a section of the foam component which extends from the surface (for example, the closed surface part) perpendicular to the surface into the depth, i.e., into the foam component.

[0101] This basis weight can be measured, for example, by removing material from the foam component, starting from the closed surface area, to a depth of 1 mm, determining the weight of the removed material, and dividing it by the removed area. According to one embodiment, the removal depth (i.e., the depth to which material has been removed from the surface) is determined using a light section sensor. For example, the removal can be carried out in two or more cycles, with the current removal depth being determined after each cycle, and the removal continuing until the desired removal depth (1 mm) is reached.

[0102] A moving mass, which is set in motion by a vibration of the closed surface part, influences the vibration behavior of the foam component. For example, a moving mass, which is set in motion by a vibration of the closed surface part, influences the vibration behavior of the closed surface part. According to one embodiment, a cover layer can therefore be applied to the skin of the foam body, which increases the moving mass of the closed surface part. According to another embodiment, a cover layer is applied to the skin of the foam body, which forms the closed surface part. In this way, for example, the air permeability of the skin can be reduced.

[0103] According to another embodiment, the top layer is arranged on the foam body. For example, in one embodiment, a skin formed during the conversion of the foam precursor can be removed (e.g., by laser irradiation, mechanical ablation, etc.), and according to another embodiment, the top layer is applied to the foam body thereby exposed, which in this embodiment forms the closed surface.

[0104] According to one embodiment, the inner surface beneath the foam component is at least partially cleaned of release agent. For example, the inner surface beneath the foam component is free of release agent. According to another embodiment, a portion of the inner surface beneath the foam component may contain a release agent in sections. This can simplify the removal of the foam component for recycling purposes.

[0105] According to one embodiment, the foam body is produced by reacting an isocyanate-containing component with a polyol-containing component, for example an isocyanate-containing component as described herein and / or a polyol-containing component as described herein.

[0106] According to one embodiment, equipping an inner surface of a tire with a foam component involves creating a gradient in the mechanical properties of the foam component and / or creating at least two phases with different mechanical properties within the foam component. For example, according to one embodiment, creating a gradient in the mechanical properties of the foam component and / or creating at least two phases with different mechanical properties within the foam component can be achieved by changing the rotational speed of the tire during the conversion of a foam precursor into a foam that forms at least part of the foam component.

[0107] According to one embodiment, the foaming precursor has a pot life of less than 120 seconds, for example, a pot life of less than 60 seconds. According to another embodiment, the foaming precursor has a pot life of less than 45 seconds. For example, according to one embodiment, the foaming precursor has a pot life of less than 25 seconds. According to one embodiment, the pot life is the time between mixing the components of the foaming precursor and reaching a gel point at room temperature. According to one embodiment, the gel point is defined as the point at which the loss modulus equals the elastic modulus.

[0108] According to one embodiment, a method disclosed herein, for example, equipping an inner surface of a tire with a foam component, comprises generating a foam which forms at least a part of the foam component, with a foam precursor which has a pot life of less than 120 seconds, for example, a pot life of less than 60 seconds.

[0109] According to a further embodiment, a method disclosed herein, for example, equipping the inner surface of a tire with a foam component, involves changing the composition of a foam precursor during its introduction into the tire. For example, a first part of the foam precursor, which is introduced into the tire in a first time interval, can have a different composition than a second part of the foam precursor, which is introduced into the tire in a second time interval, the second time interval following the first. For example, the first part of the foam precursor can form a first layer on the inner surface of the tire, and the second part of the foam precursor can form a second layer arranged on top of the first layer.

[0110] According to one embodiment, a method disclosed herein, for example, equipping the inner surface of a tire with a foam component, includes generating a foam, which forms at least a part of the foam component, with a spatially varying thickness perpendicular to the inner surface. For example, according to one embodiment, a foam precursor with a spatially varying thickness perpendicular to the inner surface can be applied to the inner surface of the tire. According to another embodiment, at least one environmental condition, for example, a surface temperature of the foam precursor, can be spatially varied to generate the foam component with a spatially varying thickness perpendicular to the inner surface.

[0111] According to one embodiment, a method disclosed herein, for example, equipping an inner surface of a tire with a foam component, includes determining, in particular measuring and / or calculating and / or estimating, a natural frequency and / or a resonance frequency of the tire (for example, a cavity resonance frequency of the tire). According to one embodiment, the method further includes adjusting at least one process parameter and / or the composition of a foam precursor for producing the foam component (for example, for producing the closed surface part) with respect to the determined natural frequency. For example, the at least one process parameter and / or the composition of the foam precursor is adjusted with respect to the thickness, modulus of elasticity, skin thickness, and foam density of the foam component.According to one embodiment, the foam component is at least partially made of a material containing filler.

[0112] According to one embodiment, one or more of the control devices disclosed herein may include a processor device configured to execute a program element disclosed herein.

[0113] According to embodiments of the first aspect, the tire is designed to implement one or more of the embodiments disclosed herein, to provide the functionality of one or more of the embodiments disclosed herein, and / or to provide the functionality as required for one or more of the embodiments disclosed herein, and / or to provide the functionality as required by one or more of the embodiments disclosed herein, in particular the embodiments of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, and / or the sixth aspect.

[0114] According to embodiments of the second aspect, the method is set up to realize one or more of the embodiments disclosed herein, to provide the functionality of one or more of the embodiments disclosed herein, and / or to provide the functionality as required for one or more of the embodiments disclosed herein, and / or to provide the functionality as required by one or more of the embodiments disclosed herein, in particular the embodiments of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, and / or the sixth aspect.According to embodiments of the third aspect, the two tires are configured to implement one or more of the embodiments disclosed herein, to provide the functionality of one or more of the embodiments disclosed herein, and / or to provide the functionality as required for one or more of the embodiments disclosed herein, and / or to provide the functionality as required by one or more of the embodiments disclosed herein, in particular the embodiments of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, and / or the sixth aspect.

[0115] According to embodiments of the fourth aspect, the foam body is configured to realize one or more of the embodiments disclosed herein, to provide the functionality of one or more of the embodiments disclosed herein, and / or to provide the functionality as required for one or more of the embodiments disclosed herein, and / or to provide the functionality as required by one or more of the embodiments disclosed herein, in particular the embodiments of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, and / or the sixth aspect.

[0116] According to embodiments of the fifth aspect, the use is designed to realize one or more of the embodiments disclosed herein, to provide the functionality of one or more of the embodiments disclosed herein and / or to provide the functionality as required for one or more of the embodiments disclosed herein, and / or to provide the functionality as required by one or more of the embodiments disclosed herein, in particular the embodiments of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect and / or the sixth aspect.

[0117] According to embodiments of the sixth aspect, the tire processing machine is configured to implement one or more of the embodiments disclosed herein, to provide the functionality of one or more of the embodiments disclosed herein, and / or to provide the functionality as required for one or more of the embodiments disclosed herein, and / or to provide the functionality as required by one or more of the embodiments disclosed herein, in particular the embodiments of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, and / or the sixth aspect.

[0118] It is noted that a reference to an aspect of the subject matter disclosed herein naturally also includes a reference to one or more embodiments of that aspect. For example, a statement that reference is made to a method according to the second aspect includes embodiments according to which the referenced method is designed according to one or more embodiments of the second aspect (and / or the first aspect and / or the third aspect).

[0119] Unless otherwise specified, numerical values ​​are to be understood as including a ±5% window; i.e., for example, a frequency of 100 Hz, according to one embodiment, includes a frequency within the interval of (100 Hz ± 5% of 100 Hz) = [95 Hz; 105 Hz], and a percentage of 50%, according to another embodiment, includes a percentage within the interval of 50% ± 5% of 50% = [47.5%; 52.5%]. According to a further embodiment, numerical values ​​and / or percentages are to be understood as including a ±10% window.

[0120] According to one embodiment, a method disclosed herein can define the functionality of a device disclosed herein without being limited to the device-specific features. In this respect, each functionality of a device disclosed herein is intended to implicitly disclose a corresponding method that is defined exclusively by the disclosed functionality. Conversely, according to one embodiment, a method disclosed herein can be carried out with any suitable known device (which may have a single element or several interacting elements). In this respect, each method disclosed herein is intended to implicitly disclose a corresponding device configured to carry out the method.

[0121] A general reference to embodiments (for example, of a tire), for example by the wording "according to at least one embodiment", by the wording "according to one or more embodiments" or the wording "according to embodiments" also includes in particular the combination of features of a corresponding independent claim without further restrictions (for example, the tire according to claim 1).

[0122] Unless expressly stated otherwise, a list of features or process steps according to one embodiment does not define an order of the features or process steps in the order of the list. According to another embodiment, a list of features or process steps defines an order of the features or process steps as specified in the list. In some embodiments above, the first occurrence of a feature has been referred to as the feature with the indefinite article, for example, both when describing embodiments of the first aspect and when describing embodiments of further aspects, such as the second aspect. However, it should be understood that the use of the indefinite article (e.g., "a") or the use of the definite article (e.g., "a") does not imply any other interpretation.The use of the definite article ("der", "die", "das") in this disclosure is not limiting, and a feature referred to in different embodiments, regardless of whether it is designated by the definite article or the indefinite article, refers to the same feature in at least one embodiment. Therefore, in a combination of different embodiments, the feature can be referenced by the indefinite article at its first occurrence and by the definite article at subsequent occurrences. Furthermore, according to one embodiment, a feature referred to by the definite article can be formed without the embodiments described above.

[0123] Furthermore, in one embodiment, the first aspect and the second aspect are two different aspects of the same object.

[0124] It should be noted that, unless expressly stated otherwise, numerical terms (first, second, third, etc.) serve only to identify different elements (for example, surface parts) without implying a sequence of process steps and without requiring or implying the existence of any of the other different elements. For example, a reference to a second surface part alone does not require that a first surface part be produced prior to the second surface part. Furthermore, a reference to a second surface part does not require that a first surface part already exists or is even provided for. Further advantages and features of the present disclosure will become apparent from the following exemplary description of currently preferred embodiments, to which, however, the claimed subject matter is not limited.The individual figures in the drawings of this document are to be considered schematic only and not to scale. The definitions and comments above also apply to the detailed description that follows, and vice versa.

[0125] BRIEF DESCRIPTION OF THE DRAWINGS

[0126] Fig. 1 shows a part of a tire according to embodiments of the items disclosed herein.

[0127] Fig. 2 shows a part of the tire from Fig. 1 in a cross-sectional view along line II-II.

[0128] Fig. 3 shows a measured absorption coefficient a as a function of frequency f for various foam components according to embodiments of the articles disclosed herein, and, as a comparative example, for a known acoustic foam.

[0129] Fig. 4 shows the frequency-dependent absorption coefficient for a foam component from Fig. 3 for the frequency range between 100 Hz and 350 Hz.

[0130] Fig. 5 shows the frequency-dependent absorption coefficient for the foam component from Fig. 4, with further characteristics of the frequency-dependent absorption coefficient according to embodiments of the items disclosed herein being illustrated in Fig. 5. Fig. 6 shows a part of a tire according to embodiments of the items disclosed herein.

[0131] Fig. 7 shows a part of the tire from Fig. 6 in a cross-sectional view along line VII-VII.

[0132] Fig. 8 shows a part of another tire according to embodiments of the items disclosed herein in a cross-sectional view.

[0133] Fig. 9 shows a part of another tire according to embodiments of the items disclosed herein in a top view of an inner surface.

[0134] Fig. 10 shows a part of a tire according to embodiments of the items disclosed herein in an enlarged, schematic cross-sectional view.

[0135] Fig. 11 shows part of another tire according to embodiments of the items disclosed herein.

[0136] Fig. 12 shows a device for equipping a tire according to embodiments of the items disclosed herein.

[0137] DETAILED DESCRIPTION

[0138] It is noted that similar or identical elements or components in different figures are designated with the same reference numbers, or with reference numbers that differ only in the leading digit or an appended letter. Such features or components, which are identical or at least functionally equivalent to the corresponding features or components in another figure, are described in detail only upon their first occurrence in the subsequent text, and the description is not repeated upon subsequent occurrences of these features and components (or the corresponding reference numbers).

[0139] If an element appears multiple times in a drawing (for example, an opening), in some cases not all elements are labeled with reference numbers to improve clarity. Naturally, the corresponding description also applies to the elements without a reference number.

[0140] It is understood that an exemplary implementation of the elements described below and indicated by reference numerals is shown in the relevant drawings and is configured in any case in an embodiment according to the following description, unless otherwise specified.

[0141] Fig. 1 shows a part of a tire 100 according to embodiments of the items disclosed herein in a top view.

[0142] According to one embodiment, the tire 100 has an inner surface 102 on which a foam component 104 is arranged. According to one embodiment, the inner surface 102 at least partially defines a cavity of the tire 100, the cavity being filled with a gas, for example, air, during operation. According to one embodiment, the cavity is defined by the inner surface of the tire 100 and a rim on which the tire 100 is mounted.

[0143] According to one embodiment, the foam component 104 has a closed surface part 106, for example as shown in Fig. 1. According to one embodiment, the closed surface part 106 forms at least part of a surface of the foam component 104, which is also referred to herein as the "foam surface". According to another embodiment, the foam component 104 also has an interface between the foam component 104 and the inner surface 102 (not visible in Fig. 1).

[0144] Fig. 2 shows a portion of the tire 100 from Fig. 1 in a cross-sectional view along line II-II. According to one embodiment, the foam component 104 has a constant thickness 108 at least in sections, for example as shown in Fig. 2. According to one embodiment, the foam component 104 has a foam body 110, which is arranged between the closed surface part 106 and the inner surface 102 of the tire 100, for example as shown in Fig. 2. According to one embodiment, the tire 100 has a tire body 101, which, according to one embodiment, comprises rubber and layers of reinforcing material embedded in the rubber. According to one embodiment, the foam body 110 provides a restoring force against deformation of the closed surface part 106.

[0145] According to one embodiment, the closed surface part 106 can be excited to vibrations with a frequency of less than 300 Hz (Hertz). Thus, according to this embodiment, the closed surface part 106 is able to be excited to vibration by a sound wave (airborne sound) with a frequency of less than 300 Hz and thereby absorb energy from the sound wave. This dampens the sound wave.

[0146] Fig. 3 shows a measured absorption coefficient a (alpha) as a function of frequency f (hereinafter also referred to as absorption spectrum) for various foam components according to embodiments of the articles disclosed herein, as well as, for comparison, for a known acoustic foam. According to one embodiment, the measurement of the absorption coefficient a was carried out in an aluminum impedance measuring tube with a 2-inch bore. The samples were placed precisely in the sample holder with a tight seal against the wall of the impedance measuring tube. According to one embodiment, the samples were installed without a gap in front of a sound-reflective tube end. According to another embodiment, an impedance measuring tube with three microphone bores and a probe microphone for recording the sound field at the center of the tube was used.According to another embodiment, measurements were taken using broadband excitation via sine sweep and evaluation according to ISO 10534-2, for example using a fast Fourier Transform (FFT) measurement technique.

[0147] According to one embodiment, the measured specimen consists of a cylindrical section of the foam component 104, wherein the round end faces of the foam component 104 are parallel to the foam surface or to the inner surface 102, the specimen encompasses the foam surface, and an end face of the cylindrical section facing away from the foam surface extends to the inner surface 102 or is at most 1 mm away from the inner surface. For example, according to one embodiment, the specimen is removed from the tire, with an attempt made to remove the foam component in its entire thickness, as far as possible.

[0148] According to one embodiment, a mean value of the frequency-dependent absorption (or the frequency-dependent absorption coefficient) was first calculated for four material samples. According to another embodiment, a standard deviation is calculated from the four measurements. Furthermore, the resulting curves (i.e., the frequency-dependent absorption coefficient and the standard deviation) are averaged over a 1 / 12 octave range.

[0149] In Fig. 3, the frequency-dependent absorption coefficient for the foam component 104 from Fig. 1 and Fig. 2 is shown at 112, in which the foam body 110 is completely covered with a skin that forms the closed surface part 106 according to embodiments of the articles disclosed herein.

[0150] Figure 212 shows the frequency-dependent absorption coefficient for a foam component 204, in which 50% of the skin of the foam body was removed with a laser beam and thus the area of ​​the closed surface part 106 is only 50% of the area of ​​the originally existing skin.

[0151] Figure 114 shows the frequency-dependent absorption coefficient for a comparative example of a conventional acoustic foam.

[0152] For the foam components 104, 204 according to embodiments of the articles disclosed herein, a sharp increase in the absorption coefficient occurs at a frequency of approximately 200 Hz, marked at 116 in Fig. 3. Consequently, the absorption coefficient for the foam components 104, 204, particularly in a frequency range between 200 Hz and 400 Hz, in which a natural frequency of a tire typically lies, is, according to one embodiment, significantly higher than that of the comparative example of conventional acoustic foam 114. In this frequency range, according to one embodiment, complete covering of the foam body with skin can be advantageous (i.e., enabling a higher absorption coefficient). Above approximately 400 Hz, according to one embodiment, the foam component 204, from which 50% of the skin has been removed, provides a higher absorption coefficient. Fig. 4 shows the frequency-dependent absorption coefficient 112 for the foam component 104 from Fig. 4.3 for the frequency range between 100 Hz and 350 Hz. For the purpose of illustrating embodiments of the items disclosed herein, it is assumed that a calculated natural frequency f. a The E of a tire at 230 Hz is marked at 118 in Fig. 4. According to one embodiment, a mean slope ml of the absorption spectrum in the frequency range between 100 Hz and faE -25 Hz is at least 20%, and in particular at least 50%, lower than the mean slope m2 in the frequency range of f a E -25 Hz to 300 Hz, for example as shown in Fig. 4. The frequency f aE -25 Hz is shown in Fig. 4 at 120. The frequency f aE +25 Hz is shown at 122 in Fig. 4. For example, the frequency-dependent absorption coefficient 112, as shown in Fig. 4, has an average slope in the frequency range between 100 Hz and f. a E -25 Hz of ml = 0.79 % / Hz. For the frequency range of faE From -25 Hz to 300 Hz, the slope is m2 = 0.35 % / Hz.

[0153] According to another embodiment, the average absorption coefficient in the range between f is aE -25 Hz and F a E + 25 Hz 29%, whereas the mean absorption coefficient in the range between 100 Hz and f a E -25 Hz is 16%. The mean absorption coefficient in the range between f a E -25 Hz and faE +25 Hz is therefore in accordance with an embodiment by more than a factor of 1.4 higher than in the range between 100 Hz and faE -25 Hz.

[0154] Fig. 5 shows the frequency-dependent absorption coefficient 112 for the foam component 104 from Fig. 4, with further characteristics of the frequency-dependent absorption coefficient according to embodiments of the items disclosed herein being illustrated in Fig. 5. According to one embodiment, a slope of the absorption spectrum averaged over a range of 25 Hz increases by more than 50% in the frequency range between 100 and FAE -25 Hz. For example, according to one embodiment, a slope m3 averaged over 25 Hz over the frequency range between 135 Hz and 160 Hz increases by more than 50%, for example by approximately 100%, compared to a slope nru averaged over 25 Hz over the frequency range between 180 and 205 Hz, for example by approximately 100%, as shown in Fig. 5.

[0155] Furthermore, in the absorption spectrum, a slope increases by at least 50% within a frequency range of 124 from 50 Hz. For example, a slope from a value at 175 Hz, which is approximately equal to the slope m3, increases within 50 Hz, i.e., up to a frequency of 225 Hz, to a slope ms, for example, as shown in Fig. 5.

[0156] In accordance with one embodiment, the foam component 104, as characterized in Figs. 4 and 5, exhibits a ratio G" / G' = tan 8 = 0.17 at 25 °C with an elastic modulus (storage modulus) G' = 0.0060 MPa (megapascals). The measured values ​​for G" / G' and G' were determined by dynamic mechanical analysis (DMA Q800 from TA Instruments) under compression with a static force of 0.3 N at a diameter of 15 mm, a heating rate of 2 K / min, a strain of 0.1%, a measurement frequency of 1 Hz, and nitrogen purging / cooling.

[0157] Fig. 6 shows a part of a tire 200 according to embodiments of the items disclosed herein.

[0158] According to another embodiment, the foam component 104 has an open surface part 108. For example, according to one embodiment, the foam component has a plurality of open surface parts 108, for example as shown in Fig. 6. In Fig. 6, only a portion of the open surface parts 108 are labelled with the reference numerals 108. According to one embodiment, the open surface parts 108 have an elongated shape. For example, according to one embodiment, the open surface parts 108 have a length that is at least twice as large as the width of the open surface parts, for example as shown in Fig. 6. According to one embodiment, the open surface parts 108 are straight, for example as shown in Fig. 6.

[0159] According to another embodiment, the open surface parts are optically distinguishable from the closed surface parts from a distance of more than 1 m due to a different type of light reflection. According to a further embodiment, this optical difference is used to display characters, numbers, or logos on the surface.

[0160] Fig. 7 shows a part of the tire 200 from Fig. 6 in a cross-sectional view along line VII-VII.

[0161] According to one embodiment, the foam component 104 is arranged on an inner surface 102 of the tire 200, for example as shown in Fig. 7. According to one embodiment, the foam component has a closed surface part 106 and an open surface part 108. According to one embodiment, the open surface parts 108 are formed by depressions 126 that extend over more than 30% of the thickness 128 of the foam component 104. In other words, in one embodiment, the depth 130 of the depressions 126 is more than 30% of the thickness 128 of the foam component 104.

[0162] According to one embodiment, the recesses 126 have openings 131, the smallest dimensions 132 of which (for example, their width, as shown in Fig. 7) are between 300 pm and 3 mm. According to one embodiment, the openings 131 are bounded by the closed surface part 106. In other words, the recesses 126 form openings 131 in the closed surface part 106, as shown in Fig. 7.

[0163] Fig. 8 shows a part of a tire 300 according to embodiments of the items disclosed herein in a cross-sectional view.

[0164] According to one embodiment, the recesses 126 extend over the entire thickness 128 of the foam component 104, for example as shown in Fig. 8. Alternatively, the recesses 126 can be configured as described herein, for example as described with reference to Fig. 7.

[0165] Fig. 9 shows a part of another tire 400 according to embodiments of the items disclosed herein in a top view of an inner surface 102.

[0166] According to one embodiment, a foam component 104 arranged on the inner surface 102 has a plurality of recesses 126, some of which are identified by the reference numeral 126 in Fig. 9. According to one embodiment, each recess 126 forms an opening 131 in the surface part 106, for example as shown in Fig. 9. According to one embodiment, the openings 131 of the recesses 126 have a round shape, for example as shown in Fig. 9. According to one embodiment, a smallest dimension 132 of the openings 131 (for example, the diameter of the openings 131) is between 300 pm and 3 mm.

[0167] Fig. 10 shows a part of a tire 500 according to embodiments of the items disclosed herein in an enlarged, schematic view.

[0168] Cross-sectional view. According to one embodiment, the foam component 104 has a skin 105 which forms the closed surface part 106, for example as shown in Fig. 10. According to one embodiment, the skin has a thickness 134. According to one embodiment, the closed surface 106 of the foam component 104 is a closed surface of the foam body 110, wherein the closed surface of the foam body 110 is formed by the skin 105 according to one embodiment, for example as shown in Fig. 10.

[0169] According to another embodiment, the foam component has a gradient of pore size in a radial direction 136 (i.e. perpendicular to a tire rotation axis and in the direction towards the tire rotation axis).

[0170] For example, according to one embodiment, pores 138, which are arranged adjacent to the inner surface 102 of the tire 100, are larger than pores 140, which are arranged adjacent to the skin 105, for example as shown in Fig. 10. It should be noted that the illustration in Fig. 10 is schematic and is intended only to illustrate principles of embodiments of the items disclosed herein. According to one embodiment, the foam body 110 is an open-pored foam body, so that air and sound waves can penetrate (deeply) into the foam body 110 from an open surface (not shown in Fig. 10).

[0171] Fig. 11 shows a part of another tire 600 according to embodiments of the items disclosed herein.

[0172] According to one embodiment, the tire 600 has a foam component 104, wherein the foam component has at least two phases 111, 211 with different mechanical and / or chemical properties (for example, different chemical compositions). For example, according to one embodiment, the foam body 110 has two different phases 111, 211 with different mechanical and / or chemical properties. According to one embodiment, the at least two different phases 111, 211 extend parallel to the inner surface 102, for example, as shown in Fig. 11. According to one embodiment, a phase boundary is formed between different phases 111, 211, for example, as shown in Fig. 11. According to another embodiment, there can be a continuous transition between the different phases.For example, mechanical and / or chemical properties can change continuously during a transition between a first phase 111 and a second phase 211.

[0173] Fig. 12 shows a tire processing machine 150 (also referred to as tire processing device, hereinafter device 150) for fitting a tire 100 according to embodiments of the items disclosed herein.

[0174] According to one embodiment, the device 150 is configured to implement the embodiments of the present disclosure described with reference to Figures 1 to 11. Reference numerals mentioned in the description of Figure 12 but not included in Figure 12 therefore always refer to Figures 1 to 11, unless expressly stated otherwise.

[0175] According to one embodiment, the device 150 has a receptacle 152 for receiving a tire 100. Furthermore, the device 150 has equipment 154 for introducing a foam component 104 (not shown in Fig. 12) into the tire 100 and / or for configuring a foam component 104 in the tire 100 to thereby produce a tire 100 according to embodiments of the items disclosed herein.

[0176] For example, the equipment 154 includes an application device 156 for applying a foam precursor to an inner surface 102 of the tire 100. According to one embodiment, the foam precursor can be transferred into the foam body 110 for coating the inner surface with the foam component 104, which comprises the foam body 110 as disclosed herein. According to one embodiment, the tire processing machine 150 is configured to produce the foam component 104 with a closed surface part 106 as disclosed herein. According to another embodiment, the application device 156 is a low-pressure mixing head with an integrated agitator or a high-pressure mixing head.

[0177] According to a further embodiment, the equipment 154 includes a laser device 158 with which the foam component 104 can be processed by means of laser radiation 160. According to a further embodiment, the laser device 158 (or another laser device, not shown) can be configured to emit laser radiation that causes and / or assists the conversion of the foam precursor into the foam body 110. According to a further embodiment, the laser device 158 can be configured to partially open the closed surface 106 of the foam component in order to produce an open surface part 108 according to the embodiments disclosed herein.

[0178] In particular for removing a skin from the foam body, the laser device 158 can be configured according to one embodiment in accordance with embodiments as described in DE 20 2023 107 514 Ul (hereafter included by reference).

[0179] According to a further embodiment, the equipment 154 can include a detection device 162, for example a light section sensor, wherein the detection device 162 is configured, according to one embodiment, to provide a state of the foam component 104 (for example a surface profile of the foam component 104) to a control device 164 (for example in the form of signals, such as sensor signals). According to one embodiment, the control device 164 of the device 150 includes a processor device 166 and a memory 168 in which a computer program product is stored, which is configured to control a method disclosed herein.According to one embodiment, the control device 164 is configured to control components of the device 150 (for example, the laser device 158 and / or the application device 156), for example, depending on signals from the detection device 162, in particular according to embodiments of the items disclosed herein.

[0180] Exemplary implementations of the subject matter disclosed herein further include, in particular, the embodiments and combinations of embodiments described below.

[0181] 1. Tires 100, 200, 300, 400, 500, 600 comprising a foam component 104 on an inner surface 102 of the tire 100, 200, 300, 400, 500, 600, comprising the foam component 104:

[0182] a closed surface part 106;

[0183] a foam body 110 which provides a restoring force against deformation of the closed surface part 106;

[0184] wherein the foam component 104, in particular the closed surface part 106, can be excited to vibrations < 1000 Hz by airborne sound.

[0185] 2. Tires 100, 200, 300, 400, 500, 600 according to embodiment 1, further comprising at least one of the following features:

[0186] The foam component 104 can be excited to vibrations < 500 Hz by airborne sound, in particular to vibrations < 300 Hz, and furthermore in particular to vibrations < 250 Hz; the closed surface part 106 at least partially separates the foam body 110 from the surrounding air mass;

[0187] the foam component 104 is arranged opposite a tread surface of the tire 100, 200, 300, 400, 500, 600;

[0188] The foam component 104 is connected to the inner surface 102, in particular by positive locking and / or chemical means;

[0189] A first section of the foam body 110 adjacent to the closed surface part 106 has a higher modulus of elasticity and / or a higher density than a second section that is arranged between the first section and the inner surface 102 of the tire 100, 200, 300, 400, 500, 600;

[0190] The foam body has at least two different phases with different mechanical and / or chemical properties, in particular wherein the at least two different phases extend parallel to the inner surface 102.

[0191] 3. Tires 100, 200, 300, 400, 500, 600 according to embodiment 1 or 2, further comprising at least one of the following features:

[0192] a ratio of loss modulus G" to elastic modulus G' of the foam component 104 is greater than 0.1, G" / G' > 0.1;

[0193] The foam body 110 is dimensionally stable, especially for at least 2 years at 20 degrees Celsius;

[0194] Measured against the closed surface part 106, the foam component 104 has a Shore hardness between 15 and 65;

[0195] The mean pore size of the foam body 110 is between 30 pm and 1000 pm, in particular between 100 pm and 400 pm;

[0196] Measured on the closed surface part 106, the elastic modulus G' is between 3 kPa and 8 kPa;

[0197] The foam component 104 has an open surface part 108; the foam component 104 has a plurality of depressions, in particular depressions extending over more than 10% of the thickness of the foam component 104, in particular over more than 30%, more than 50% or more than 70%,

[0198] The depressions have a diameter of 300 mm to 3 mm; the thickness of the foam component 104 is between 1 cm and 4 cm.

[0199] 4. Tires 100, 200, 300, 400, 500, 600 according to one of embodiments 1 to 3, wherein

[0200] The tire 100, 200, 300, 400, 500, 600 has an effective circumference which is calculated as the arithmetic mean of a rim seat circumference and a tread circumference of the tire 100, 200, 300, 400, 500, 600;

[0201] The tire 100, 200, 300, 400, 500, 600 has a calculated natural frequency 118 of a cavity vibration, hereinafter referred to as f a E denotes, defined, wherein the calculated natural frequency 118 is calculated from the speed of sound at 20 degrees Celsius in air divided by the effective circumference and wherein the speed of sound is 343.5 m / s; furthermore having at least one of the following features:

[0202] The foam component 104 has a vibration spectrum, whereby the vibration spectrum of the foam component 104 overlaps with the calculated natural frequency 118 of the tire 100, 200, 300, 400, 500, 600;

[0203] The foam component 104 has an absorption spectrum which exhibits at least one of the following characteristics:

[0204] The mean slope of the absorption spectrum in the frequency range between 100 Hz and faE - 25 Hz is at least 20% lower than the mean slope in the frequency range of faE. a E - 25 Hz to 300 Hz;

[0205] a mean absorption coefficient in the range between f aE - 25 Hz and f a E + 25 Hz is at least 1.4 times higher than an average absorption coefficient in the range between 100 Hz and f aE - 25 Hz;

[0206] In the absorption spectrum, a sliding averaged slope of the absorption spectrum over a range of 25 Hz increases in the frequency range between 100 and f aE minus 25 Hz by more than 50%; in the absorption spectrum, the slope of the absorption spectrum within a frequency range of 50 Hz increases by at least 50%, in particular where the frequency range is below 500 Hz;

[0207] The absorption spectrum is measured in an impedance tube with a sample body which is a cylindrical part of the foam component 104 with a diameter of 2 inches;

[0208] The absorption spectrum was measured according to the description.

[0209] 5. Tires 100, 200, 300, 400, 500, 600 according to one of embodiments 1 to 4, further comprising at least one of the following features:

[0210] the closed surface part 106 is formed by a skin of the foam body 110;

[0211] The thickness of the skin is between 100 pm and 800 pm;

[0212] The closed surface part 106 is structured and only partially covers the foam body 110.

[0213] 6. Tires 100, 200, 300, 400, 500, 600 according to one of embodiments 1 to 5, wherein the foam component 104 has at least one of the following features:

[0214] a density gradient in the radial direction 136, in particular a density increasing in the direction towards a tire rotation axis;

[0215] a gradient of pore size in the radial direction, in particular a pore size decreasing in the direction of the tire's axis of rotation;

[0216] a gradient of an elastic constant in the radial direction, in particular a gradient of an elastic modulus;

[0217] a gradient in the open porosity of the foam body 110, in particular an increasing proportion of closed pores in the direction of the tire's axis of rotation. 7. Tires 100, 200, 300, 400, 500, 600 according to one of embodiments 1 to 6, further comprising at least one of the following features:

[0218] The foam body 110 has an average density of between 15 kg / m³. 3 and 300 kg / m² 3 ;

[0219] The foam component 104 has a surface weight of 2 mg / cm² in a 1 millimeter thick layer, measured from the closed surface part 106. 2 up to 30 mg / cm² 2 on;

[0220] The inner surface 102 under the foam component 104 is at least partially cleaned of release agent;

[0221] The foam component 104 has a material which contains at least one filler.

[0222] 8. Tires 100, 200, 300, 400, 500, 600 according to one of embodiments 1 to 7,

[0223] wherein the foam body 110 is produced by reacting an isocyanate-containing component with a polyol-containing component; and wherein the polyol-containing component has at least one of the following:

[0224] (i) Polyether polyols containing at least 50 wt.% polypropylene glycol, based on the polyether polyols;

[0225] (ii) Polybutylene glycol;

[0226] (iii) 0 wt. % - 30 wt. % hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component;

[0227] (iv) Polyether polyol copolymer, in particular based on a mole fraction of at least 50% of the comonomer propylene glycol.

[0228] 9. Method comprising equipping an inner surface 102 of a tire 100, 200, 300, 400, 500, 600 with a foam component 104, the foam component 104 comprising:

[0229] a closed surface part 106; a foam body 110 which provides a restoring force against deformation of the closed surface part 106;

[0230] wherein the foam component 104, in particular the closed surface part 106, can be excited to vibrations < 1000 Hz by airborne sound.

[0231] 10. Method according to embodiment 9, further comprising at least one of the following features:

[0232] the closed surface part 106 at least partially separates the foam body 110 from the surrounding air mass;

[0233] Generating a gradient in the mechanical properties of the foam component 104 and / or generating at least two phases with different mechanical properties in the foam component 104, in particular by changing the rotational speed of the tire 100, 200, 300, 400, 500, 600 during the conversion of a foam precursor into a foam which forms at least a part of the foam component 104;

[0234] Producing a foam which forms at least part of the foam component 104, with a foam precursor which has a pot life of less than 120 seconds, in particular less than 60 seconds;

[0235] Change in the composition of a foam precursor during the introduction of the foam precursor into the tire 100, 200, 300, 400, 500, 600;

[0236] Generating a foam which forms at least part of the foam component 104, with a spatially varying thickness perpendicular to the inner surface 102.

[0237] 11. Method according to embodiment 9 or 10, further comprising at least one of the following: Determining, in particular measuring and / or calculating and / or estimating, a natural frequency 118 and / or a resonance frequency of the tire 100, 200, 300, 400, 500, 600;

[0238] Adapting at least one process parameter and / or a composition of a foam precursor for the production of the foam component 104, in particular the closed surface part 106, with regard to the determined natural frequency 118, in particular the adaptation of the at least one process parameter and / or the composition of the foam precursor is carried out with regard to at least one of the thickness, modulus of elasticity, skin thickness, foam density of the foam component 104;

[0239] The foam component 104 is at least partially made of a material containing fillers.

[0240] 12. Two tires 100, 200, 300, 400, 500, 600 of the same type, each of which is a tire according to one of embodiments 1 to 8 and of which a first tire 100, 200, 300, 400, 500, 600 has a first effective circumference and of which a second tire 100, 200, 300, 400, 500, 600 has a second effective circumference which is larger than the first effective circumference;

[0241] where the effective circumference is calculated as the arithmetic mean of a rim seat circumference and a tread circumference of the tire in question 100, 200, 300, 400, 500, 600;

[0242] wherein the foam component 104 of the first tire 100, 200, 300, 400, 500, 600 can be excited to vibrations with higher frequencies than the foam component 104 of the second tire 100, 200, 300, 400, 500, 600.

[0243] 13. Two tires 100, 200, 300, 400, 500, 600 according to embodiment 12, wherein

[0244] Each of the two tires 100, 200, 300, 400, 500, 600 has a calculated natural frequency 118 of a cavity vibration, hereinafter referred to as f a E denotes, defines and wherein the calculated natural frequency 118 is calculated from a speed of sound at 20 degrees in air divided by the effective circumference of the tire in question 100, 200, 300, 400, 500, 600, where the speed of sound Celsius is 343.5 m / s;

[0245] wherein the foam component 104 of the first tire 100, 200, 300, 400, 500, 600 can be excited to vibrations whose frequency is higher than half the difference between the calculated natural frequency 118 of the first tire 100, 200, 300, 400, 500, 600 and the calculated natural frequency 118 of the second tire 100, 200, 300, 400, 500, 600 than the vibrations to which the second tire 100, 200, 300, 400, 500, 600 can be excited;

[0246] in particular where

[0247] the foam component 104 of the first tire 100, 200, 300, 400, 500, 600 has a first foam body 110;

[0248] the foam component 104 of the second tire 100, 200, 300, 400, 500, 600 has a second foam body 110; and

[0249] the first foam body 110 and the second foam body 110 are formed from the same foam precursor.

[0250] 14. Foam component 104, comprising a closed surface part 106 and a foam body 110, which provides a restoring force against deformation of the closed surface part 106; wherein the foam component 104, in particular the closed surface part 106, can be excited to vibrations < 1000 Hz by airborne sound; in particular wherein the foam body 110 is obtainable by a reaction of an isocyanate-containing component with a polyol-containing component; and wherein the polyol-containing component comprises at least one of the following:

[0251] (i) Polyether polyols containing at least 50 wt.% polypropylene glycol, based on the polyether polyols;

[0252] (ii) Polybutylene glycol;

[0253] (iii) 0 wt. % - 30 wt. % hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component; (iv) polyether polyol copolymer, in particular based on a mole fraction of at least 50% of the comonomer propylene glycol.

[0254] 15. Use of an isocyanate-containing component and a polyol-containing component for the production of a foam body 110, in particular a foam body 110 of a foam component 104 in a tire 100, 200, 300, 400, 500, 600;

[0255] wherein the foam component 104 has a closed surface part 106;

[0256] wherein the foam body 110 provides a restoring force against deformation of the closed surface part 106;

[0257] wherein the foam component 104, in particular the closed surface part 106, can be excited to vibrations < 1000 Hz by airborne sound; in particular wherein the polyol-containing component has at least one of the following:

[0258] (i) Polyether polyols containing at least 50 wt.% polypropylene glycol, based on the polyether polyols;

[0259] (ii) Polybutylene glycol;

[0260] (iii) 0 wt. % - 30 wt. % hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component;

[0261] (iv) Polyether polyol copolymer, in particular based on a mole fraction of at least 50% of the comonomer propylene glycol.

[0262] 16. Having a tire processing machine:

[0263] an application device for applying a foam precursor of a foam body 110 to an inner surface 102 of a tire 100, 200, 300, 400, 500, 600, wherein the foam precursor is convertible into a foam body 110 of a foam component 104 for equipping the inner surface 102 with a foam component 104 which has the foam body 110;

[0264] wherein the tire processing machine is configured to produce the foam component 104 with a closed surface part 106, wherein the foam body 110 provides a restoring force against deformation of the closed surface part 106; and

[0265] wherein the foam component 104, in particular the closed surface part 106, can be excited to vibrations < 1000 Hz by airborne sound.

[0266] According to embodiments of the items disclosed herein, any suitable entity (e.g., units and devices, etc.) can be provided, at least partially, in the form of corresponding computer programs that enable a processor device to provide the functionality of the corresponding entity as described herein. According to other embodiments, any suitable entity as described herein can be provided in hardware. According to other hybrid embodiments, some entities can be provided in software while other entities are provided in hardware.

[0267] It should be noted that each entity disclosed herein (e.g., a foam component, a foam body, or a surface part, etc.) is not limited to a single, dedicated entity as described in some embodiments. Furthermore, the items described herein may be provided in various ways with different granularities while still providing the specified functionality. It should also be noted that, according to some embodiments, a separate entity may be provided for each of the functions disclosed herein. According to other embodiments, one entity (e.g., a foam component, a foam body, or a surface part, etc.) may be configured to provide two or more functions as described herein. According to yet other embodiments, two or more entities (e.g., a foam component, a foam body, or a surface part, etc.) may be configured to provide two or more functions as described herein.) be configured to provide a function as described herein. According to one embodiment, the control device includes a processor device comprising at least one processor for executing at least one program element, which may correspond to a corresponding software module.

[0268] A reference to laser radiation can, of course, also be defined analogously by reference to a radiation path of the laser radiation, and vice versa. In this respect, every reference to laser radiation here analogously reveals a reference to a radiation path of the laser radiation.

[0269] It should be noted that the implementations described herein, in particular those illustrated in the drawings, represent only a limited selection of possible combinations of embodiments of the present disclosure. It is generally possible to combine the features of different embodiments in a suitable manner, so that, for a person skilled in the art, a multitude of combinations of different embodiments are to be considered disclosed with the embodiments explicitly disclosed herein. Furthermore, it should be mentioned that terms such as "a" or "one" do not exclude plurality. Terms such as "containing" or "having" do not exclude further features or process steps. Consequently, according to one embodiment, the term "having" or "containing" means "having, among other things." According to another embodiment, the term "having" or "having" means "consisting of."

[0270] According to one embodiment, the term "set up for" includes, among other things, the meaning "configured to." Furthermore, the disclosure of a function performed by an entity implicitly reveals that, according to one embodiment, the entity is configured to perform the function.

[0271] The term "in particular" here refers generally to optional features. In other words, the term "in particular" is used synonymously with the term "for example" and is interchangeable with it.

[0272] The expression "A and / or B" usually includes "only A," "only B," and also "A and B." In an expression referring to a list of features, "at least one" always includes the individual features (each separately as a single feature) as well as any combination of the features. For example, the expression "at least one of the features A and B" includes the feature "only A," "only B," and "A and B." Similarly, the expression "at least one of the features A or B" includes the feature "only A," "only B," and "A and B." Similarly, the expression "at least one of the features A, B" includes the feature "only A," "only B," and "A and B."

[0273] It should also be noted that reference numerals in the claims should not be interpreted as limiting the scope of the claims. Furthermore, it should be noted that reference numerals in the description and the description's reference to the drawings should not be interpreted as limiting the scope of the description. Rather, the drawings merely illustrate an exemplary implementation of a particular combination of several embodiments of the items disclosed herein, with any other combination of embodiments being equally possible and to be considered disclosed with this application. In summary:

[0274] A tire comprising a foam component on an inner surface of the tire is disclosed, the foam component comprising: a closed surface part; and a foam body which provides a restoring force against deformation of the closed surface part; wherein the foam component, in particular the closed surface part, can be excited to vibrations < 1000 Hz by airborne sound. Furthermore, a method for equipping a tire with such a foam component, a corresponding foam component, and a tire processing machine are disclosed.

Claims

patent claims 1. Tires (100, 200, 300, 400, 500, 600) comprising a foam component (104) on an inner surface (102) of the tire (100, 200, 300, 400, 500, 600), comprising the foam component (104): a closed surface part (106); a foam body (110) which provides a restoring force against deformation of the closed surface part (106); wherein the foam component (104), in particular the closed surface part (106), can be excited to vibrations < 1000 Hz by airborne sound.

2. Tires (100, 200, 300, 400, 500, 600) according to claim 1, further comprising at least one of the following features: The foam component (104) can be excited to vibrations < 500 Hz by airborne sound, in particular to vibrations < 300 Hz, and furthermore in particular to vibrations < 250 Hz; the closed surface part (106) at least partially separates the foam body (110) from the surrounding air mass; the foam component (104) is arranged opposite a tread surface of the tire (100, 200, 300, 400, 500, 600); the foam component (104) is connected to the inner surface (102), in particular by positive locking and / or chemical means; a first section of the foam body (110) adjacent to the closed surface part (106) has a higher modulus of elasticity and / or a higher density than a second section that is arranged between the first section and the inner surface (102) of the tire (100, 200, 300, 400, 500, 600); The foam body has at least two different phases with different mechanical and / or chemical properties, in particular wherein the at least two different phases extend parallel to the inner surface (102).

3. Tires (100, 200, 300, 400, 500, 600) according to claim 1 or 2, further comprising at least one of the following features: a ratio of loss modulus G" to elastic modulus G' of the foam component (104) is greater than 0.1, G" / G' > 0.1; the foam body (110) is dimensionally stable, in particular for at least 2 years at 20 degrees Celsius; Measured against the closed surface part (106), the foam component (104) has a Shore hardness between 15 and 65; a mean pore size of the foam body (110) is between 30 pm and 1000 pm, in particular between 100 pm and 400 pm; Measured on the closed surface part (106), the elastic modulus G' is between 3 kPa and 8 kPa; The foam component (104) has an open surface part (108); the foam component (104) has a plurality of depressions, in particular depressions extending over more than 10% of the thickness of the foam component (104), in particular over more than 30%, more than 50% or more than 70%, The depressions have a diameter of 300 pm to 3 mm; the thickness of the foam component (104) is between 1 cm and 4 cm.

4. Tires (100, 200, 300, 400, 500, 600) according to any one of the preceding claims, wherein the tire (100, 200, 300, 400, 500, 600) has an effective circumference which is calculated as the arithmetic mean of a rim seat circumference and a tread circumference of the tire (100, 200, 300, 400, 500, 600); the tire (100, 200, 300, 400, 500, 600) a calculated natural frequency (118) of a cavity vibration, hereinafter referred to as f aE-designated, defined, wherein the calculated natural frequency (118) is calculated from the speed of sound at 20 degrees Celsius in air divided by the effective circumference and wherein the speed of sound is 343.5 m / s; furthermore comprising at least one of the following features: The foam component (104) has a vibration spectrum, wherein the vibration spectrum of the foam component (104) overlaps with the calculated natural frequency (118) of the tire (100, 200, 300, 400, 500, 600); the foam component (104) has an absorption spectrum which exhibits at least one of the following features: The average slope of the absorption spectrum lies in the frequency range between 100 Hz and f a E - 25 Hz at least 20% below the mean slope in the frequency range of f a E - 25 Hz to 300 Hz; a mean absorption coefficient in the range between f aE - 25 Hz and f aE + 25 Hz is at least 1.4 times higher than an average absorption coefficient in the range between 100 Hz and f aE - 25 Hz; In the absorption spectrum, a sliding averaged slope of the absorption spectrum over a range of 25 Hz increases in the frequency range between 100 and f aE minus 25 Hz by more than 50%; In the absorption spectrum, the slope of the absorption spectrum within a frequency range of 50 Hz increases by at least 50%, particularly where the frequency range is below 500 Hz; The absorption spectrum is measured in an impedance tube with a sample body which is a cylindrical part of the foam component (104) with a diameter of 2 inches; The absorption spectrum was measured according to the description.

5. Tires (100, 200, 300, 400, 500, 600) according to one of the preceding claims, further comprising at least one of the following features: the closed surface part (106) is formed by a skin of the foam body (110); the thickness of the skin is between 100 µm and 800 µm; The closed surface part (106) is structured and only partially covers the foam body (110).

6. Tires (100, 200, 300, 400, 500, 600) according to any of the preceding claims, wherein the foam component (104) has at least one of the following features: a density gradient in the radial direction (136), in particular a density increasing in the direction towards a tire rotation axis; a gradient of pore size in the radial direction, in particular a pore size decreasing in the direction of the tire's axis of rotation; a gradient of an elastic constant in the radial direction, in particular a gradient of an elastic modulus; a gradient in the open porosity of the foam body (110), in particular an increasing proportion of closed pores in the direction of the tire rotation axis.

7. Tires (100, 200, 300, 400, 500, 600) according to one of the preceding claims, further comprising at least one of the following features: the foam body (110) has a mean density between 15 kg / m³ 3 and 300 kg / m² 3 ; The foam component (104) has a surface weight of 2 mg / cm² in a 1 millimeter thick layer, measured from the closed surface part (106). 2 up to 30 mg / cm² 2 on; the inner surface (102) under the foam component (104) is at least partially cleaned of release agent; The foam component (104) has a material which contains at least one filler.

8. Tires (100, 200, 300, 400, 500, 600) according to any one of the preceding claims, wherein the foam body (110) is produced by reacting an isocyanate-containing component with a polyol-containing component; and wherein the polyol-containing component comprises at least one of the following: (i) Polyether polyols containing at least 50 wt.% polypropylene glycol, based on the polyether polyols; (ii) Polybutylene glycol; (iii) 0 wt. % - 30 wt. % hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component; (iv) Polyether polyol copolymer, in particular based on a mole fraction of at least 50% of the comonomer propylene glycol.

9. Two tires (100, 200, 300, 400, 500, 600) of the same type, each of which is a tire according to any one of claims 1 to 8 and of which a first tire (100, 200, 300, 400, 500, 600) has a first effective circumference and of which a second tire (100, 200, 300, 400, 500, 600) has a second effective circumference which is larger than the first effective circumference; where the effective circumference is calculated as the arithmetic mean of a rim seat circumference and a tread circumference of the tire in question (100, 200, 300, 400, 500, 600); wherein the foam component (104) of the first tire (100, 200, 300, 400, 500, 600) can be excited to vibrations with higher frequencies than the foam component (104) of the second tire (100, 200, 300, 400, 500, 600).

10. Two tires (100, 200, 300, 400, 500, 600) according to claim 9, wherein each of the two tires (100, 200, 300, 400, 500, 600) has a calculated natural frequency (118) of a cavity vibration, hereinafter referred to as f a E denotes, defines and wherein the calculated natural frequency (118) is calculated from the speed of sound at 20 degrees in air divided by the effective circumference of the respective tire (100, 200, 300, 400, 500, 600), where the speed of sound is 343.5 m / s; wherein the foam component (104) of the first tire (100, 200, 300, 400, 500, 600) can be excited to vibrations whose frequency is higher than half the difference between the calculated natural frequency (118) of the first tire (100, 200, 300, 400, 500, 600) and the calculated natural frequency (118) of the second tire (100, 200, 300, 400, 500, 600) than the Vibrations to which the second tire (100, 200, 300, 400, 500, 600) can be excited; in particular where the foam component (104) of the first tire (100, 200, 300, 400, 500, 600) has a first foam body (110); the foam component (104) of the second tire (100, 200, 300, 400, 500, 600) has a second foam body (110); and the first foam body (110) and the second foam body (110) are formed from the same foam precursor.

11. Having a tire processing machine: a dispensing device for applying a foam precursor of a foam body (110) to an inner surface (102) of a tire (100, 200, 300, 400, 500, 600), wherein the foam precursor is convertible into a foam body (110) of a foam component (104) for equipping the inner surface (102) with a foam component (104) which has the foam body (110); wherein the tire processing machine is configured to produce the foam component (104) with a closed surface part (106), wherein the foam body (110) provides a restoring force against deformation of the closed surface part (106); and wherein the foam component (104), in particular the closed surface part (106), can be excited to vibrations < 1000 Hz by airborne sound.

12. Method comprising equipping an inner surface (102) of a tire (100, 200, 300, 400, 500, 600) with a foam component (104), the foam component (104) comprising: a closed surface part (106); a foam body (110) which provides a restoring force against deformation of the closed surface part (106); wherein the foam component (104), in particular the closed surface part (106), can be excited to vibrations < 1000 Hz by airborne sound.

13. The method of claim 12, further comprising at least one of the following features: the closed surface part (106) at least partially separates the foam body (110) from the surrounding air mass; Generating a gradient in the mechanical properties of the foam component (104) and / or generating at least two phases with different mechanical properties in the foam component (104), in particular by changing the rotational speed of the tire (100, 200, 300, 400, 500, 600) during the conversion of a foam precursor into a foam which forms at least part of the foam component (104); Producing a foam which forms at least part of the foam component (104) using a foam precursor which has a pot life of less than 120 seconds, in particular less than 60 seconds; Change in the composition of a foam precursor during the introduction of the foam precursor into the tire (100, 200, 300, 400, 500, 600); Generating a foam which forms at least a part of the foam component (104) with a spatially varying thickness perpendicular to the inner surface (102).

14. Method according to claim 12 or 13, further comprising at least one of the following: Determine, in particular measure and / or calculate and / or estimate, a natural frequency (118) and / or a resonance frequency of the tire (100, 200, 300, 400, 500, 600); Adjusting at least one process parameter and / or a composition of a foam precursor for producing the foam component (104), in particular the closed surface part (106), with regard to the determined natural frequency (118), in particular the adjustment of the at least one process parameter and / or the composition of the foam precursor with regard to at least one of the thickness, modulus of elasticity, skin thickness, foam density of the foam component (104); The foam component (104) is at least partially made of a material which contains fillers.

15. Foam component (104) comprising a closed surface part (106) and a foam body (110) which provides a restoring force against deformation of the closed surface part (106); wherein the foam component (104), in particular the closed surface part (106), can be excited to vibrations < 1000 Hz by airborne sound; in particular wherein the foam body (110) is obtainable by a reaction of an isocyanate-containing component with a polyol-containing component; and wherein the polyol-containing component comprises at least one of the following: (i) Polyether polyols containing at least 50 wt.% polypropylene glycol, based on the polyether polyols; (ii) Polybutylene glycol; (iii) 0 wt. % - 30 wt. % hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component; (iv) polyether polyol copolymer, in particular based on a mole fraction of at least 50% of the comonomer propylene glycol.

16. Use of an isocyanate-containing component and a polyol-containing component for the production of a foam body (110), in particular a foam body (110) of a foam component (104) in a tire (100, 200, 300, 400, 500, 600); wherein the foam component (104) has a closed surface part (106); wherein the foam body (110) provides a restoring force against deformation of the closed surface part (106); wherein the foam component (104), in particular the closed surface part (106), can be excited to vibrations < 1000 Hz by airborne sound; in particular wherein the polyol-containing component has at least one of the following: (i) Polyether polyols containing at least 50 wt.% polypropylene glycol, based on the polyether polyols; (ii) Polybutylene glycol; (iii) 0 wt. % - 30 wt. % hydroxyl-terminated homopolymers of butadiene based on the polyol-containing component; (iv) Polyether polyol copolymer, in particular based on a mole fraction of at least 50% of the comonomer propylene glycol.

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