A process for applying noise-reducing elements to a tyre for vehicle wheels. A plurality of noise-reducing elements are arranged on a feeding belt movable along a predetermined feeding direction. The noise-reducing elements are subsequently aligned along the feeding direction and brought into mutual contact, to then be transferred onto a service plane arranged downstream of the feeding belt along the feeding direction and having, on an upper surface thereof, a continuous film which supports a layer of adhesive material. The layer of adhesive material is applied onto a lower surface of each of the noise-reducing elements taking it from the continuous film. The noise-reducing elements are then transferred one by one onto a conveyor belt arranged downstream of the service plane along the feeding direction. The noise-reducing elements are finally positioned one by one on a radially inner surface of a tyre.

A noise damper, annulus for reducing tire noise, and tire and noise damper assembly are disclosed. The noise damper, annulus for reducing tire noise, and tire and noise damper assembly mitigate sound produced by a moving tire. The noise damper and annulus for reducing tire noise may move within a tire cavity.

Provided are a method and a device for attaching a sound absorbing member to an inner face of a tire. In a state that an adhesive is interposed between a first face of a sound absorbing member and an inner face of the tire, the sound absorbing member is placed, and an expandable and contractible bag placed inside the tire is expanded, and the expanded bag presses a second face of the sound absorbing member to bond the first face to the inner face of the tire with the adhesive therebetween.

A pneumatic tire includes a plurality of protrusion portions extending along a tire side surface of a tire side portion in a direction that intersects a tire circumferential direction and a tire radial direction. Each of the plurality of protrusion portions includes an intermediate portion and an end portion. The intermediate portion in an extension direction has a highest position of a projection height from the tire side surface. The end portion is provided on either end of the intermediate portion in the extension direction, and has a lowest position of the projection height from the tire side surface. The highest position of the projection height of the intermediate portion is disposed in a range of 20% of a tire cross-sectional height on an inner side and an outer side in the tire radial direction from a tire maximum width position.

A pneumatic tire in accordance with the present disclosure comprises a first sound damper fixed to a tire inner surface and being made of a sponge material; a second sound damper disposed on a tire internal space side of the first sound damper, and being made of a sponge material; and a communication device retained between the first sound damper and the second sound damper, wherein the second sound damper has a hardness greater than a hardness of the first sound damper.

A tire noise reduction apparatus may include a housing mounted on an external circumferential surface of a wheel rim on which a tire is mounted, the housing having an internal space and being open at one side in a circumferential direction of the wheel rim, wherein the housing includes a neck at an opposite side which is opposite to the open one side; and a movable member inserted into the internal space of the housing through the open one side of the housing and having an internal space in fluidical communication with the internal space of the housing, the movable member being mounted to the housing to be movable in a direction in which the movable member is inserted into the internal space of the housing and in a direction in which the movable member is withdrawn out of the housing.

Disclosed is a tire including: at least one pin protruding from an inner circumferential surface of a tread portion of the tire toward a tire radial direction inner side; and a noise damper caught by the at least one pin, wherein the at least one pin has a distal end with a diameter smaller than that of portions other than the distal end.

A vehicle wheel includes a pair of vertical walls that extend vertically up from an outer circumferential surface of a well portion and extend in a wheel circumferential direction and a Helmholtz resonator that is disposed between the pair of vertical walls and bonded to side surfaces of the pair of vertical walls with an adhesive, in which the Helmholtz resonator is not bonded to the outer circumferential surface of the well portion.

The present invention relates to a method and an apparatus for applying noise reducing elements to tyres for vehicle wheels. Noise reducing elements (12), all equal to each other, are fed in succession on a conveyor (20) according to a predetermined path and are oriented on the predetermined path all in the same way. Tyres (2) of different sizes (C, P) are fed in succession on a conveyor (20) up to an application station (34). In the application station (34), the noise reducing elements (12) are picked up from the conveyor (20) and applied to radially inner surfaces of the tyres (2). The application comprises: arranging the noise reducing elements (12) with the larger dimension (L) directed in a circumferential direction or arranging the noise reducing elements (12) with the larger dimension (L) directed in an axial direction as a function of the sizes (C, P) of the tyre (2) in which they are applied.

A pneumatic tyre (1) for decreasing running noise in a low temperature environment includes a noise damper (20) made of a porous material and fixed to a tyre inner cavity surface (16) of a tread portion (2). In the noise damper (20), hardness under a 25% compression load measured in accordance with Japanese Industrial standard JIS K6400-2 in an atmosphere of −60 degrees Celsius is 110 kPa or less.