Pneumatic tires for a motor vehicle

Abstract

Pneumatic tire for a motor vehicle with a tread section and sidewall sections adjoining it on both sides, which define a tire cavity (5) in which at least one noise-dampening element (6; 7; 8; 9; 14) is arranged, which consists of a foam insert (6a; 7a; 8a; 9a; 14a) attached to a radial inner surface (10) of the tread section (2) of the tire (1), which has a cross-sectional area enlarged by inner or outer recesses (6b; 7b; 8b; 9b; 14b), characterized in that the foam insert (6a, 7a, 9a, 14a) as a noise-dampening element (6, 7, 9, 14) has a base body in cross-section rectangular with rounded corners at the top left and / orThe upper right section comprises channel-like longitudinal grooves (L3) facing the inner surface (10) of the tread section (2) of the tire (1), which are arranged as recesses (9b) and are adjacent and parallel to each other, and which have ventilation openings (12) opening into the tire cavity (5), as well as a single inner central longitudinal groove (L1) facing away from the inner surface (10) of the tread section (2) of the tire (1), and a central longitudinal groove (L4) as a recess (14b) is arranged in the foam insert (6a, 7a, 9a, 14a), which is directed towards the inner surface (10) of the tread section (2) and has several ventilation openings (17) in the area of ​​the longitudinal groove (L4), and ventilation openings (15, 15a) in the noise-dampening element in the area of ​​the longitudinal groove (L1) and in side ribs (16). (6, 7, 9, 14) are arranged, which open into the tire cavity (5).

Description

[0001] The invention relates to a pneumatic tire for a motor vehicle according to the preamble of claim 1.

[0002] From DE 11 2004 001 424 T5, a foam insert in a pneumatic tire for a motor vehicle is known, which has grooves in the longitudinal and transverse directions. Furthermore, from US 7 581577 B2, a foam insert in a pneumatic tire of a motor vehicle is known, the surface area of ​​which is increased by a suitable structure.

[0003] From JP 2004 - 82 947 A another tire is known which reduces noise emissions via a foam insert.

[0004] From KR 10 1 519 299 B1 a low-noise pneumatic tire is known which has belt-shaped noise-absorbing elements inside.

[0005] Furthermore, a sound absorber for tires is known from WO 2012 / 028877 A1.

[0006] The object of the invention is to create a pneumatic tire for a motor vehicle in which a foam insert is arranged that is intended exclusively to reduce the rolling noise of the vehicle tire.

[0007] This problem is solved according to the invention by the features of claim 1.

[0008] The main advantages achieved with the invention are that noise reduction is achieved by increasing the cross-sectional area inside the vehicle tire through the use of a foam insert. According to the invention, this is accomplished by the noise-dampening element consisting of a foam insert attached to a radial inner surface of the tire's tread section, which has a cross-sectional area increased by internal or external recesses. The recesses in the foam insert advantageously increase the cross-sectional area, thus reducing rolling noise through noise absorption by the foam insert within the tire.

[0009] The foam insert has a rectangular cross-section and features internal longitudinal grooves facing away from the inner surface of the tire's tread section. These grooves are spaced apart and run parallel to each other. The longitudinal grooves on the inside of the foam insert thus increase the inner surface area of ​​the tire, significantly reducing both interior and exterior noise. This has an impact on tire classification, as the exterior noise level is measured during driving past a test point and during acceleration and constant-speed driving.

[0010] According to the invention, the foam insert, acting as a noise-dampening element, comprises a rectangular base body with a single central longitudinal groove facing away from the inner surface of the tire's tread section. Ventilation openings can be arranged in the base element in the area of ​​the longitudinal groove and in side ribs.

[0011] The foam insert has a rectangular cross-section base body with channel-like longitudinal grooves facing the inner surface of the tire's tread section. These grooves are arranged adjacent to each other and run parallel to one another. The longitudinal grooves feature ventilation openings that lead into the tire cavity. Overall, the cutouts in the foam insert's base body also result in a weight reduction compared to solid inserts.

[0012] The ventilation openings in the channel-like longitudinal grooves of the foam insert's base body allow heat to escape into the tire cavity through the ventilation openings when heat develops at the tire.

[0013] Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

[0014] They show: Fig. 1 a tire cavity of a pneumatic tire with internal longitudinal grooves arranged in a rectangular base body, Fig. 2 a tire cavity of the pneumatic tire with a single inner longitudinal groove with ventilation openings arranged in a rectangular base body, Fig. 3 a tire cavity of the pneumatic tire with inner pyramidal elements arranged in a base body with intervening triangular recesses, Fig. 4 a tire cavity of the pneumatic tire with longitudinal grooves arranged in a base body, which are directed towards the inner surface of the tire and the longitudinal grooves have ventilation openings into the tire cavity and Fig. 5 an enlarged view Fig. 4, in which a multitude of ventilation openings are arranged in the longitudinal grooves, Fig. 6 another embodiment of a foam insert with a central groove with ventilation openings facing the inner surface of the running surface section, Fig. 7 a cut along line VII-VII of the Fig. 6 through the foam insert and Fig. 8 a cut along line VIII-VIII of the Fig. 6 through the foam insert.

[0015] A pneumatic tire 1 for a motor vehicle comprises a tread section 2 and sidewall sections 3, 4 adjoining it on both sides, which define a tire cavity 5 in which at least one noise-dampening element 6; 7; 8; 9; 14 is arranged.

[0016] The noise-dampening element 6; 7; 8; 9; 14 is available in several versions in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. 8 shown: It essentially consists of a foam insert 6a; 7a; 8a; 9a; 14a attached to an inner surface 10 of the tread section 2 of the tire 1, which has a cross-sectional area enlarged by inner or outer recesses 6b; 7b; 8b; 9b; 14b. The foam insert can be glued to the inside of the tire 1 or attached in some other way.

[0017] The foam insert 6a as noise-dampening element 6, according to Fig. 1, has a base body with a rectangular cross-section and a recess 6b formed as a longitudinal groove L, which is directed away from the inner surface 10 of the tread section 2 of the tire 1 and which are spaced apart and run parallel to each other.

[0018] According to a further explanation, Fig. 2, the foam insert 7a, as a noise-dampening element 7, has a single inner central longitudinal groove L1 as a recess 7b, facing away from the inner surface 10 of the tread section 2 of the tire 1. Alternatively, ventilation openings 15, 15a can be arranged in the recess 7b of the longitudinal groove L1 and in lateral ribs 16 in the foam insert 7a.

[0019] In the execution, according to Fig. 3, the foam insert 8a, acting as a noise-dampening element 8, is provided with inner pyramid bodies 11 facing away from the inner surface 10 of the tread section 2 of the wheel 1, which form triangular recesses 8b between them. The pyramid bodies 11 are arranged adjacent to and parallel to each other.

[0020] In further detail, according to the Fig. 4 and Fig. 5, the foam insert 9a, acting as a noise-dampening element 9, has channel-like longitudinal grooves L3 as recesses 9b facing the inner surface 10 of the tread section 2 of the tire 1. These grooves are adjacent and parallel to each other. The longitudinal grooves L3 have ventilation openings 12 that open into the tire cavity 5. Fig. 5 shows more closely, arranged at intervals and around the perimeter.

[0021] In a further version, according to the Fig. 6, Fig. 7 to Fig. 8, a central longitudinal groove L4 is arranged as a recess 14b in the foam insert 14a, which is aligned with the inner surface 10 of the running surface section 2 and has ventilation openings 17 in the area of ​​the longitudinal groove L4.

[0022] In the explanations of the Fig. 1 and Fig. 3 Optionally, ventilation openings can also be arranged in the noise-dampening elements 6; 8; which open into the tire cavity 5.

[0023] For better installation of the foam inserts 6a, 7a, 9a, 14a, a rectangular cross-section can also be deviated from by rounding off or completely removing the corners shown in the upper right or upper left of the drawing.

Claims

[1] Pneumatic tire for a motor vehicle with a tread section and sidewall sections adjoining it on both sides, which define a tire cavity (5) in which at least one noise-dampening element (6; 7; 8; 9; 14) is arranged, which consists of a foam insert (6a; 7a; 8a; 9a; 14a) attached to a radial inner surface (10) of the tread section (2) of the tire (1), which has a cross-sectional area enlarged by inner or outer recesses (6b; 7b; 8b; 9b; 14b), characterized by, that the foam insert (6a, 7a, 9a, 14a) as a noise-dampening element (6, 7, 9, 14) has a rectangular base body in cross-section with rounded corners at the top left orThe upper right section comprises channel-like longitudinal grooves (L3) facing the inner surface (10) of the tread section (2) of the tire (1), which are arranged as recesses (9b) and are adjacent and parallel to each other, and which have ventilation openings (12) opening into the tire cavity (5), as well as a single inner central longitudinal groove (L1) facing away from the inner surface (10) of the tread section (2) of the tire (1), and a central longitudinal groove (L4) as a recess (14b) is arranged in the foam insert (6a, 7a, 9a, 14a), which is directed towards the inner surface (10) of the tread section (2) and has several ventilation openings (17) in the area of ​​the longitudinal groove (L4), and ventilation openings (15, 15a) in the noise-dampening element in the area of ​​the longitudinal groove (L1) and in side ribs (16). (6, 7, 9, 14) are arranged, which open into the tire cavity (5).

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