According to an embodiment of the present disclosure, a generator using a flexible piezoelectric device comprises a tire with a hollow tube structure, a ring-shaped inner wall formed on an inner surface of the tire, a supporting frame connecting a center of the tire with in inner surface of the tire to support the inner wall, and a flexible piezoelectric device fastened or mounted on an overall outer surface of the inner wall. The flexible piezoelectric device is pressurized to generate electricity as the tire is compressed by contact with the ground and at space between the inner wall and the inner surface of the tire is thus reduced.

A pneumatic tire is formed by winding a sheet member (A) and a sheet member (B) onto a molding drum and molding a cylindrical body. A laminate body (M) in which the sheet member (B) is layered in advance on the outer periphery of the sheet member (A) is wound onto a molding drum (10), the tack value of a material (a) constituting the sheet member (A) being smaller than the tack value of a material (b) constituting the sheet member (B), the length of the sheet member (A) being configured so that a starting end (As) of winding on the molding drum (10) and an ending end (Ae) of winding do not overlap, and the length of the sheet member (B) being configured so that the ending end (Be) of winding extends longer in the circumferential direction than the ending end (Ae) of winding of the sheet member (A).

A pneumatic tire is formed by winding a sheet member (A) and a sheet member (B) onto a molding drum and molding a cylindrical body. A laminate body (M) in which the sheet member (B) is layered in advance on the outer periphery of the sheet member (A) is wound onto a molding drum (10), the tack value of a material (a) constituting the sheet member (A) being smaller than the tack value of a material (b) constituting the sheet member (B), the length of the sheet member (A) being configured so that a starting end (As) of winding on the molding drum (10) and an ending end (Ae) of winding do not overlap, and the length of the sheet member (B) being configured so that the ending end (Be) of winding extends longer in the circumferential direction than the ending end (Ae) of winding of the sheet member (A).

The invention relates to a valve system (6, 62, 64, 66) for a tubeless wheel, the wheel comprising a rim (1) and a tire (2), which form a tire/rim volume (10) that can be filled with air, and a puncture protection insert (5, 52, 54, 55, 56) positioned inside the tire/rim volume (10), the valve system comprising a valve stem body (82, 84, 86), which extends along a valve axis (A) and has a first end and a second end, and a valve base (72, 73, 74, 75, 76) adjoining said second end, the second end being positioned in the tire/rim volume (10) when the valve system (6, 62, 64, 66) is mounted on the wheel. The purpose of this is to simplify the insertion of a tube-like cannula or hollow needle of a tool for filling or extracting sealing fluid through the valve system into the tire/rim volume. According to the invention, this is achieved in that the valve base has an outer circumference that increases continuously along the valve axis (A) in the direction of the tire/rim volume, forming a thickened valve base end, and the valve system (6, 62, 64, 66) also comprises a sleeve (4, 42, 43, 44, 45, 46) having a first end and a second end, wherein the first end of the sleeve (4, 42, 43, 44, 45, 46) connects to the thickened valve base end (72, 73, 74, 75, 76) and the sleeve (4, 42, 43, 44, 45, 46) extends from there along the valve axis in a direction oriented away from the valve stem body (82, 84, 86).

The invention relates to a valve system (6, 62, 64, 66) for a tubeless wheel, the wheel comprising a rim (1) and a tire (2), which form a tire/rim volume (10) that can be filled with air, and a puncture protection insert (5, 52, 54, 55, 56) positioned inside the tire/rim volume (10), the valve system comprising a valve stem body (82, 84, 86), which extends along a valve axis (A) and has a first end and a second end, and a valve base (72, 73, 74, 75, 76) adjoining said second end, the second end being positioned in the tire/rim volume (10) when the valve system (6, 62, 64, 66) is mounted on the wheel. The purpose of this is to simplify the insertion of a tube-like cannula or hollow needle of a tool for filling or extracting sealing fluid through the valve system into the tire/rim volume. According to the invention, this is achieved in that the valve base has an outer circumference that increases continuously along the valve axis (A) in the direction of the tire/rim volume, forming a thickened valve base end, and the valve system (6, 62, 64, 66) also comprises a sleeve (4, 42, 43, 44, 45, 46) having a first end and a second end, wherein the first end of the sleeve (4, 42, 43, 44, 45, 46) connects to the thickened valve base end (72, 73, 74, 75, 76) and the sleeve (4, 42, 43, 44, 45, 46) extends from there along the valve axis in a direction oriented away from the valve stem body (82, 84, 86).

An apparatus to reduce skidding of a vehicle tire on the road surface, creates a vacuum between the tire and the road surface when the wheels slip, especially during heavy braking. A number of conduits are attached to the inner side of the tire, each of them extended from a hole in the rim to some of the tread voids. A vacuum head is placed in contact with the rim and sweeps the perforated part of the rim as the wheel rotates. The vacuum head sucks air from the only voids which are precisely in the road contact area, through some of the conduits. A special tread pattern closes off these voids with respect to the ambient atmosphere.

A pneumatic commercial vehicle tire of radial design includes at least a three-ply belt, of which two belt plies are working plies and one radially outermost belt ply is a cover ply. Each of these belt plies includes reinforcements which are made of steel cord and which are embedded in elastomer. The steel cords of each of the three belt plies are coated with brass so as to provide for good elastomer adhesion. The brass coating of the reinforcement supports of the two working plies has a copper proportion of 60 wt. % to 65 wt. % and the brass coating of the reinforcement supports of the cover ply has a copper proportion of 66 wt. % to 70 wt. %.

A pneumatic commercial vehicle tire of radial design includes at least a three-ply belt, of which two belt plies are working plies and one radially outermost belt ply is a cover ply. Each of these belt plies includes reinforcements which are made of steel cord and which are embedded in elastomer. The steel cords of each of the three belt plies are coated with brass so as to provide for good elastomer adhesion. The brass coating of the reinforcement supports of the two working plies has a copper proportion of 60 wt. % to 65 wt. % and the brass coating of the reinforcement supports of the cover ply has a copper proportion of 66 wt. % to 70 wt. %.

In a pneumatic tire that includes strip members which extends in a tire circumferential direction, both ends thereof reaching each bead portion, a belt layer is disposed in a tread portion on an outer side in a tire radial direction of the strip members. The strip members are divided in the tire width direction, and the divided strip members have joints that join together in the tire circumferential direction. Relative positions of the joints are disposed deviated by not less than 20 in the tire circumferential direction within a region between an edge of a maximum width in the tire width direction of the belt layer and a maximum tire width position.

In a pneumatic tire that includes strip members which extends in a tire circumferential direction, both ends thereof reaching each bead portion, a belt layer is disposed in a tread portion on an outer side in a tire radial direction of the strip members. The strip members are divided in the tire width direction, and the divided strip members have joints that join together in the tire circumferential direction. Relative positions of the joints are disposed deviated by not less than 20 in the tire circumferential direction within a region between an edge of a maximum width in the tire width direction of the belt layer and a maximum tire width position.