The process for producing tyres comprises arranging no more than four sets of noise-reducing elements (2), each set being associated with a respective dimension L.sub.x different from the dimension associated with the other sets; feeding in succession a set of tyres for vehicle wheels, having different values C of the inner circumferential extension; for each inner circumferential extension value, determining a respective number n.sub.x of noise-reducing elements for each set of noise-reducing elements, with x ranging from 1 to N, as a function of the value of the inner circumferential extension, wherein for at least one value of the inner circumferential extension at least two respective numbers n.sub.x differ from 0; for each tyre (1), collecting from each set of noise-reducing elements (2) the respective number n.sub.x of noise-reducing elements (2) and applying the collected noise-reducing elements (2) in a circumferential sequence along an inner surface (3) of the tyre (1), with the dimension L.sub.x oriented circumferentially.

A pneumatic tyre comprising an impermeable layer that is suitable for guaranteeing the pressure tightness of the air contained within the internal cavity of the casing and a layer of sound-insulating material housed within said internal cavity and made, in turn, with polyols deriving from CNSL.

A vibration absorbed tire is provided which has a laminated structure that contains dilantant layer causing reaction rate differences in the cross-sectional direction and thus functions without impairing the motion characteristics of the tire even with only a single or a few very thin layers, whereby the tire is easy to manufacture and has reduced cost. The tire has the laminated structure, which includes the dilantant layer which is a layer where particles and a bonding material thereof are arranged to act as dilantant, and in which the particles are arranged so that the distribution density of the particles decreases toward the upper and the lower surface from the central part of the layer.

The invention relates to a pneumatic vehicle tire with a material ring (10) inside it, adhesively attached to the inner surface opposite from the tread (1), the material ring (10) adhering to a self-sealing sealant (8), which at least immediately after its application has a tackiness required for the adhesive attachment of the material ring (10). To improve the sealing effect, the material ring (10) arranged on the sealant (8) is closed-cell and airtight.

A pneumatic tire includes a band-like sound absorbing member adhered on an inner surface of a tread portion along the tire circumferential direction. Cuts are formed on the band-like sound absorbing member mutually intersecting such that angles 1, 2 with regard to the tire width direction are within a range where 0190 or 0290. The cuts are locally disposed in a region adjacent to an end portion on a vehicle inner side of the band-like sound absorbing member. A width of the placement region of the cuts is from 10% to 80% with regard to a width of the band-like sound absorbing member.

A sub-air chamber member includes: a lower surface portion disposed proximate to the outer circumferential surface of the well portion; an upper surface portion disposed radially outside of the lower surface portion; a pair of edge portions engaging with the well portion. A space portion is positioned above the upper surface portion, the space portion being formed by a part of the upper surface portion and an inner wall surface of the well portion. A strong axis of principal axes of a section of the sub-air chamber member perpendicular to an axis of the sub-air chamber member is inclined by a first predetermined angle relative to a wheel width direction Y.

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, in which the at least one pin has on its distal end an expanded-diameter portion by which the noise damper is locked such that the noise damper is fixed to the at least one pin.

Disclosed is a tire with reduced cavity noise including an adhesive agent layer applied to an inside of an inner liner and a sound absorber layer attached to the adhesive agent layer, wherein the adhesive agent layer includes poly(ether-urethane) containing alkoxysilane at both ends thereof. The tire with reduced cavity noise is stable without causing separation of a sound absorber even upon heating and deformation during driving.

A tire including a sealant layer and a sound absorbing material layer is provided, and more particularly, a tire is provided, which includes a sound absorbing material layer which is attached to an inner surface of a tire, and a sealant layer which is disposed between the inner surface of the tire and the sound absorbing material layer and includes a sealant which attaches the sound absorbing material layer to the inner surface of the tire. The sound absorbing material layer includes a non-woven fabric.

A tire comprises a tread portion provided with at least one longitudinal groove extending in a tire circumferential direction. The longitudinal groove has a groove bottom surface and a pair of groove wall surfaces extending outwardly in a tire radial direction from the groove bottom surface. The groove bottom surface is provided with a groove bottom protruding portion protruding outwardly in the tire radial direction. At least one of the pair of the groove wall surfaces is provided with a groove wall protruding portion protruding toward a side of a groove center of the longitudinal groove.