Sumitomo Rubber Industries Patente

A pneumatic tire 1 includes, on a first side portion 3A, first side blocks 11 arranged on a first tire circumferential line Y1 and second side blocks 12 arranged on a second tire circumferential line Y2. The first side blocks 11 and the second side blocks 12 are spaced apart in a tire circumferential direction, but overlap in tire radial and circumferential directions. An overlapping length Ha in the tire radial direction by which the first side block 11 and the second side block 12 overlap is 30% to 60% of a maximum length H2 in the tire radial direction of the second side block 12. An overlapping length La in the tire circumferential direction by which the first side block 11 and the second side block 12 overlap is 5% or more of a maximum length L2 in the tire circumferential direction of the second side block 12.

A heavy duty tire 2 includes a tread 4 having one or more center circumferential grooves 16. A center portion 28 of the tread 4 includes center land portions 22 each including lateral grooves 32 arranged in the center portion 28 such that a reference lateral groove and a corresponding lateral groove respectively located on one side and another side in a circumferential direction constitute one lateral groove pair. Second and first ends Es and Ef of the reference lateral groove and the corresponding lateral groove in the lateral groove pair are at the same position in the circumferential direction. The one or more center circumferential grooves 16 include at least one circumferential narrow groove 44 having a pair of wall surfaces 44S that come into contact with each other at a narrow groove portion 48 when the tread 4 comes into contact with a road surface and becomes deformed.

The present invention provides a tire having both dry grip performance and grip performance on snow improved in a well-balanced manner, and the tire comprises a tread portion (2) and a belt layer (8) provided on an inner side of the tread portion in a tire radial direction, the tread portion is formed from a rubber composition containing styrene-butadiene rubber having a styrene content of 25% by mass or less as a rubber component, the belt layer includes a metal cord as a reinforcing cord, in at least one layer, the metal cords is arranged to form an angle of 30 degrees or more with respect to a tire circumferential direction, and a ratio (St/AG), calculated from a value of the styrene content St (% by mass) of the styrene-butadiene rubber and a value of the angle AG (degrees) formed by the metal cord with respect to the tire circumferential direction, is less than 0.8.

A pneumatic tire (1) includes a first ground contact edge (Te1), a ground contact surface (3a) extending therefrom to a second ground contact edge (Te2), a first side outer surface (6a) extending radially inward therefrom, and a tread portion (3) having a first shoulder land region (5A) demarcated by a first shoulder circumferential groove (4A) and the first ground contact edge. A first virtual line (L1) is a tangent line at an axial midpoint (Pm) of the first shoulder land region inclined at an angle from 74 to 80° and a second virtual line (L2) is a tangent line at a first position (P1) of the first side outer surface inclined at an angle from 36 to 40° relative to the tire radial direction. A radial first distance (t) from the first ground contact edge to the tire equator (C) is 2% to 6% of a ground contacting width (TW).

A pneumatic tire has a profile including a ground contact surface and a first side outer surface. The ground contact surface has a first virtual line inclined at a first angle of 74 to 80 degrees relative to a tire radial direction. The first side outer surface has a second virtual line inclined at a second angle of 36 to 40 degrees relative to the tire radial direction. The tread portion has a belt layer including belt cords arranged therein at an angle λ relative to a tire circumferential direction. A ride comfort index (λ×t/TW) is from 1.0 to 2.0. The ride comfort index is defined by the angle λ in degree, a first distance (t) in millimeter in the tire radial direction from a first ground contact edge to a tire equator on the ground contact surface, and a ground contacting width (TW) in millimeter.

A motorcycle tire (1) includes crown blocks (4) including first crown blocks (6) and second crown blocks (7). Each of the first crown blocks (6) has a heel-side edge (11) formed in a V-shape and inclined at an angle (α1) of 10 degrees or less on both axial sides with respect to the tire axial direction. A total number of the first crown blocks (6) is 30% or more of a total number of the crown blocks (4). A first ground contacting surface shape (6a) of each of the first crown blocks (6) has a maximum length (W1) in the tire axial direction from 60% to 70% of a tread width. Each of the second crown blocks (7) has a second ground contacting surface shape (7a) having a maximum length (WC) in the tire axial direction smaller than the maximum length (W1) of the first ground contacting surface shape (6a).

Provided is a technique for detecting the rotation of attachment positions of tires in a vehicle. A tire position rotation detection device includes an acquisition unit, a first calculation unit, a second calculation unit, and a rotation determination unit. The acquisition unit acquires a rotational speed of each of tires while a vehicle is traveling. The first calculation unit calculates a first indicator. The second calculation unit calculates a second indicator. The rotation determination unit determines whether or not rotation of attachment positions of the tires has been performed before the vehicle starts traveling based on the first indicator and the second indicator. The rotation determination unit determines that the rotation of the tires has been performed before the vehicle starts traveling when a change in the first indicator from an initial value exceeds a predetermined first threshold value and a change in the second indicator from an initial value is equal to or below a predetermined second threshold value.

A tire 2 includes a tread 4 and a band 16. The tread 4 has an outer surface 4G including a crown portion 64, a pair of middle portions 66, and a pair of shoulder portions 68. The crown portion 64 has a contour represented by an arc having a radius TR1 not less than 5 times and not greater than 7 times an axial width Wa of a ground-contact surface of the tire 2 in a standard state. The band 16 includes a band cord 56 composed of an organic fiber cord. At a position corresponding to 70% of a maximum width SW of the tire 2 in the standard state, the band cord 56 has a contraction ratio SRs not less than 70% and not greater than 130% of a contraction ratio SRc of the band cord 56 on an equator plane of the tire 2.

Provided is a pneumatic tire comprising a carcass, a reinforcing layer, and a cap tread, wherein the following inequalities are satisfied, (1) A 2 − A 1 > 0 (2) L 1 / L 2 > 0.30 (3) 30 ° CE * c > K / A 2 − A 1 × L 1 − L 2 × 0.3 <img class="EMIRef" id="9a0e1778-f6ea-4b29-9d88-9fa5e978fda3-ia03" /> (where K is 310) where A<1> represents an angle, in degrees, at which a carcass cord inclines from a tire circumferential direction at a position on a tire center line, A<2> represents an angle, in degrees, at which the carcass cord inclines from the tire circumferential direction at a tire maximum width position, L<1> represents a land ratio, in %, of a region including a tire equator, L<2> represents a land ratio, in %, of a pair of regions including tread ends, 30°CE*c represents a complex elastic modulus at 30°C of a rubber composition constituting the cap tread, and K represent a constant.

A tire having a tread portion including circumferential grooves and land regions each provided with groove-shaped portions (31) each having a first end on a first side and a second end on a second side in a tire circumferential direction. In each pair of the groove-shaped portions circumferentially adjacent to each other, the first end of one groove-shaped portion and the second end of the other groove-shaped portion of the pair are formed at the same circumferential position in the same land region or different land regions. In at least one land region in a 70% loaded state, an absolute value of a difference between one of angles θa of both circumferential edges of the at least one land region and an angle θb of one of the groove-shaped portions formed therein with respect to the tire axial direction is 5 degrees or more.

A puncture repair kit (1) switchable between a repair mode for repairing a puncture in an object (T) and a supply mode for supplying only compressed air (A) includes a container (2) containing a puncture repair fluid, a compressed air source (3) for supplying the compressed air (A), a cover member (4) for supplying only the compressed air (A), and an extraction portion (5) disposed between the compressed air source (3) and the container (2) or the cover member (4). The extraction portion (5) includes an outer member (6) configured to have the container (2) or the cover member (4) attached thereto, an inner member (7) assembled inside the outer member (6), and a seal member (8) attached to an outer periphery of the inner member (7). The inner member (7) has a seal retaining structure (7a) for preventing the seal member (8) from coming off the inner member (7).

A puncture repair kit (1) includes a container (2) containing a puncture repair fluid (R), compressed air source (3) for supplying compressed air (A), an extraction portion (4) disposed between the compressed air source (3) and the container (2) for extracting the puncture repair fluid (R) from the container (2). The extraction portion (4) includes an outer member (5) attached to the container (2), and an inner member (6) assembled inside the outer member (5). The inner member (6) is configured to be selectively assembled with the outer member (5) in either a first state where the entire amount of the compressed air is supplied to the inside of the container (2), or a second state where a portion of the compressed air is supplied to the inside of the container (2) and a portion of the compressed air is supplied to an outside of the container (2).

A tread rubber forming method comprises the steps of: forming a non-conductive layer 10 by winding a non-conductive first rubber strip 3 around a cylindrical body 2 for plural turns; forming a conductive layer 20 by winding a conductive second rubber strip 4 around the cylindrical body for at least one turn in parallel to the circumferential direction of the cylindrical body; and forming a non-conductive layer 10 by winding the first rubber strip 3 around the cylindrical body for plural turns. When winding the non-conductive rubber strip 3 for each one turn of the plural turns, the first rubber strip 3 is wound in parallel to the circumferential direction to form at least 3/4 portion of the one turn, and wound obliquely to form the remaining portion of the one turn.

A recycling method for a puncture repair kit disclosed herein includes an acquisition step S10 and a classification step S20. In the acquisition step S10, information by which at least a manufacturing lot of a tire puncture repair kit including a puncture repair liquid can be specified is acquired. In the classification step S20, a recycling method for the puncture repair liquid is classified on the basis of the information by which the manufacturing lot can be specified.

To improve the durability of tires during high-speed running, provided is a tire comprising a carcass, a belt provided on the radially outer side of the carcass, a band having a band cord and provided on the radially outer side of the belt, and a tread provided on the radially outer side of the band, wherein the band cord is a sustainable polyester cord, the tire satisfies the following formula (1), when the cord diameter of the band cord is d (mm), the number of cords present in a direction 5 cm perpendicular to the longitudinal direction is D (cords/5 cm), the dimensional stability index is DSI (%), the loss tangent 30°C tan δ is measured under the conditions of the temperature of the tread of 30°C, the initial strain of 5%, the dynamic strain of 1%, and the frequency of 10 Hz, and the thickness of the tread is A (mm). d × D / DSI × 30 ° C tan δ × A ≧ 0.7 <img class="EMIRef" id="a743ac19-09b4-47ef-938d-e89d098472b7-ia01" />

A tire determination system 100 includes: a depth camera 4 configured to capture an image of a tire mounted on a vehicle 5; a determination processing unit configured to determine whether or not uneven wear has occurred in the tire, based on the captured image captured by the depth camera 4; a first acquisition processing unit configured to acquire transition information indicating transition of a remaining groove of the tire; and a prediction processing unit configured to predict a remaining service life of the tire, based on a degree of progress of the uneven wear determined based on the captured image and the transition information acquired by the first acquisition processing unit, if the determination processing unit determines that the uneven wear has occurred.

A tire deflation determination system includes: a first acquisition processing unit 51A configured to acquire a rotation speed of each tire mounted on a vehicle 1A; a second acquisition processing unit 54A configured to acquire a resonance frequency of the tire, based on the acquired rotation speed; a replacement determination processing unit 58A configured to determine whether or not a difference between the acquired resonance frequency and a reference frequency exceeds a first determination value; and a change processing unit 59 configured to, if it is determined that the difference between the resonance frequency and the reference frequency exceeds the first determination value, change a threshold value used in a deflation determination process of determining whether or not the tire has become deflated.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Provided is a heavy-duty tire comprising a tread part, the tread part comprising a rubber layer composed of a rubber composition, the rubber layer comprising a tread surface, the rubber composition comprising: a rubber component comprising a predetermined amount of an isoprene-based rubber; and a filler comprising a predetermined amount of silica, and wherein the content A<IR>, in % by mass, of the isoprene-based rubber in the rubber component, the content A<SIL>, in % by mass, of the silica in the filler, 0°C tan δ of the rubber composition, a total area S<MG>, in mm<2>, a pair of outermost circumferential main grooves present on a tread ground-contacting surface of the tread part, and a total area S<LG>, in mm<2>, of a shoulder lateral groove and a shoulder sipe that are present on the tread ground-contacting surface satisfy the predetermined inequalities.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …