Abstract: A wheel tread part 2 of a tread is constituted of a longitudinal main groove 3 formed in a circumferential direction via a center of a width direction, a plurality of longitudinal subgrooves 4 formed on both side parts of the longitudinal main groove 3 in the circumferential direction, and a plurality of traverse grooves 5 formed in a width direction to intersect the longitudinal main and subgrooves 3, 4, and divided into a plurality of blocks 6. Each of the plurality of blocks 6 is provided with a one-end-open sipe 9, and formed so that rigidity in the width direction can be higher in an end a of a center side region compared with an end b of a shoulder side region. Since the rigidity of the end a of the center side region is higher, a reaction force is generated in accordance with a steering angle from the start of changing the same.

Abstract: A wheel tread part 2 of a tread is constituted of a longitudinal main groove 3 formed in a circumferential direction via a center of a width direction, a plurality of longitudinal subgrooves 4 formed on both side parts of the longitudinal main groove 3 in the circumferential direction, and a plurality of traverse grooves 5 formed in a width direction to intersect the longitudinal main and subgrooves 3, 4, and divided into a plurality of blocks 6. Each of the plurality of blocks 6 is provided with a one-end-open sipe 9, and formed so that rigidity in the width direction can be higher in an end a of a center side region compared with an end b of a shoulder side region. Since the rigidity of the end a of the center side region is higher, a reaction force is generated in accordance with a steering angle from the start of changing the same.

Abstract: An audio system component is disclosed which has a boxlike casing partitioned into an air intake passageway extending along one side of the casing, an exhaust passageway extending along the other side, and a circuit chamber between the two passageways. Both passageways are open rearwardly of the casing. A cooling fan is mounted in the circuit chamber for causing airflow from the intake to the exhaust passageway through the circuit chamber. The electric circuitry of the instrument, possibly including electronic components that need cooling, is housed in the circuit chamber so as to be cooled by the airflow. The circuitry has terminals arranged on the back of the casing and between the open ends of the air passageways.

Abstract: A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, and at least one carcass ply toroidally extending between a pair of bead cores and wound around the bead core to form a turnup portion, in which a reinforcing rubber having substantially a crescent shape at its lateral section is disposed at an inside of the sidewall portion and a cord reinforcing layer containing cord(s) extending in a direction of approximately 90° with respect to a radial line segment is disposed in at least a bead portion.

Abstract: A pneumatic radial tire comprises a tread portion having a two-layer structure of a cap rubber layer disposed outward in the radial direction and a base rubber layer disposed inward in the radial direction, in which an outer surface of said base rubber layer in the radial direction being existent in a position corresponding to not less than 20% of a depth of a main groove formed in the tread portion outward from a bottom of the main groove in the radial direction, and the base rubber layer being compounded with a recrosslinking inhibition assistant and/or an inorganic compound powder.

Abstract: An audio system component is disclosed which has a boxlike casing partitioned into an air intake passageway extending along one side of the casing, an exhaust passageway extending along the other side, and a circuit chamber between the two passageways. Both passageways are open rearwardly of the casing. A cooling fan is mounted in the circuit chamber for causing airflow from the intake to the exhaust passageway through the circuit chamber. The electric circuitry of the instrument, possibly including electronic components that need cooling, is housed in the circuit chamber so as to be cooled by the airflow. The circuitry has terminals arranged on the back of the casing and between the open ends of the air passageways.

Abstract: A pneumatic radial tire comprising a pair of bead portions and sidewall portions and a tread portion connecting the sidewalls. At least one radial carcass layer reinforcing said portions is positioned between two beads embedded in the bead portions. A belt comprises at least two layers having cords crossing each other from one layer to the next, a cap circumferentially wound having organic fiber cords therein and reinforcing rubber layers in an entire region of the side wall portions supporting a load of the tire having a crescent shaped cross section along an inner side of the carcass. At least one tie-element layer resisting force generated in width directions of the tire and having many cords oriented substantially orthogonally with respect to an equatorial plane of the tire is arranged between the belt and the cap.

Abstract: A pneumatic radial tire comprising a pair of bead portions and sidewall portions and a tread portion connecting the sidewalls. At least one radial carcass layer reinforcing said portions is positioned between two beads embedded in the bead portions. A belt comprises at least two layers having cords crossing each other from one layer to the next, a cap circumferentially wound having organic fiber cords therein and reinforcing rubber layers in an entire region of the side wall portions supporting a load of the tire having a crescent shaped cross section along an inner side of the carcass. At least one tie-element layer resisting force generated in width directions of the tire and having many cords oriented substantially orthogonally with respect to an equatorial plane of the tire is arranged between the belt and the cap.

Abstract: A pneumatic radial tire including one or more belt layers, wherein cords are used as cords for reinforcing at least one belt layer. These cords are formed by impregnating and attaching a resin having a modulus in tension of not more than 150 kg/mm.sup.2 to bundles of cord-like fibers composed of a number of filaments having a tensile strength of not less than 15 g/d and a fineness of 1-15 deniers, an impregnated and attached amount of the filaments being in a range of 30% to 70 wt % relative to a weight of the filaments, and each of the cords has an elliptical or rectangular cross-section shape having an aspect ratio of a major axis (b)/a minor axis (a) being 1.5 to 5. Each of the bundles of the fibers are not twisted.

Abstract: A pneumatic radial tire comprises a belt comprised of plural belt layers, in which at least one belt layer is formed by arranging particular twisted cords, which are obtained by twisting particular filament-resin composite bodies, at a particular end count. In this tire, the weight is light, the rolling resistance and steering stability as well as the resistances to bending of belt cord in the rapid turning and breaking of belt cord in the running on bad road are considerably excellent.

Abstract: A low rolling resistance pneumatic radial tire having an improved appearance comprises a carcass composed of a single rubberized carcass ply containing cords therein. The carcass ply cord is a high tenacity vinylon cord having characteristics after vulcanization represented by the following equations: ##EQU1## Further, the carcass ply has the number of overlapped cords of not more than 15 at the shoulder portion in its joint portion.

Abstract: A pneumatic radial tire having improved comfortability and durability comprises a belt composed of at least two belt reinforcing layers, one of which layers contains high strength and high modulus polyvinyl alcohol fiber cords having particular properties.

Abstract: A pneumatic radial tire having a low noise and an improved cornering stability has a belt structure of at least two belt layers composed of at least one layer containing cords each obtained by twisting organic fibers and at least one layer containing steel cords, at least one of the organic fiber cord layers being interposed between the steel cord layer and a tread at a state that both transversely outermost end portions are folded inward. This organic fiber cord is a cord obtained by twisting high strength, high modulus polyvinyl alcohol fibers and has particular twisting coefficient and strength. The tire further satisfies a particular relation between a height of a turnup portion of a carcass ply around a bead portion and a tensile stress at 50% elongation of a bead filler rubber reinforcing the bead portion at room temperature.

Abstract: A pneumatic radial tire having improved cornering stability, service durability and rolling resistance is provided by using high-elasticity, high-strength vinylon fiber having specified elongation and strength as a cord material for at least one belt layer in a belt composed of at least two belt layers. Particularly, noise level can be reduced without damaging other tire performances by combining at least one layer of high-elasticity, high-strength vinylon fiber cords with at least one layer of steel cords as a belt of the tire.

Abstract: A pneumatic tire is reinforced with cords made of polyvinyl alcohol based fibers, and meets the following requirements:(1) A tenacity, S (g/d) of the cords taken out from the tire meets a relation: S.gtoreq.14.5-12N.sub.T in which N.sub.T is a coefficient of twist, which is represented by N.sub.T =N.times..sqroot.0.139.times.D/.rho..times.10-3. N, D and .rho. are a number of twist (turns/10 cm), a half of a total denier of the cords, and a specific density of the cords, respectively.(2) A tenacity-retaining percentage of the cords in an absolutely dried state is not less than 90% of that before the treatment with boiling water. The absolutely dried state means that after the cord is treated with boiling water at 120.degree. C. while being maintained at a constant length, the cord is dried.

Abstract: A pneumatic radial tire having improved cornering stability, service durability and rolling resistance is provided by using high-elasticity, high-strength vinylon fiber having specified elongation and strength as a cord material for at least one belt layer in a belt composed of at least two belt layers. Particularly, noise level can be reduced without damaging other tire performances by combining at least one layer of high-elasticity, high-strength vinylon fiber cords with at least one layer of steel cords as a belt of the tire.