摘要:
The uneven wear produced in the tread side rib in the heavy duty pneumatic radial tire is prevented by arranging a peripheral fine groove on a particular region of the side face of the tread portion in a particular form.
摘要:
A pneumatic radial tire for heavy load vehicles comprising a body reinforcement and a bead portion reinforcement, in which the bead portion reinforcement substantially continuously covers the carcass ply wound around a bead core up to the inside of the tire, the upper end of the turn-up portion of the carcass ply and the outside upper end of the bead portion reinforcement covering the upper end of the carcass ply are arranged at an area other than a bead portion flexible region defined by two segments BC and AD as shown in attached FIG. 3, the bead portion reinforcement makes use of a cord having a modulus which corresponds to 15 to 60% of that of the ply cord of the carcass, and a tension at 100% elongation of a soft stiffener corresponds to 5 to 30% of that of a hard stiffener, the soft and hard stiffeners being disposed on the bead core one upon the other.
摘要:
A pneumatic radial tire for heavy vehicles comprising in combination two wide zigzag circumferential main grooves for dividing a tread into a center region and two side regions, a narrow zigzag groove for dividing each region into two portions, and a branch groove located in the center region and connected to the main and narrow grooves to define blocks and satisfying the following requirements, i.e.(1) each main groove has a width which is 5 to 9% of the width of the tread, is substantially U-shaped in cross-section and has a wall defined by a bent or wavy line whose pitch is 0.3 to 1.3 times the width of the main groove and a swing width within a range from 0.1 to 1.0 times the width of the main groove, and(2) the branch groove has a depth which is 14 to 36% of the depth of the main groove.
摘要:
A pneumatic radial tire so constructed as to reduce a breaker interlayer shearing strain without adding any particular supplemental reinforcing layer is disclosed. The radial tire has an initial sectional shape which satisfies the following conditions.1. R.sub.1 /R.sub.1' .ltoreq. 0.82. r.sub.2 /w / r.sub.2' /w' .gtoreq. 1.53. modulus of a breaker cord .gtoreq. 10 .times. 10.sup.3 Kg/mm.sup.2, and4. Breaker cord angle .ltoreq. 25.degree.Where R.sub.1 is a radius of curvature of an outer profile of a carcass in a vertical center section through a rotational axis of the tire on a normal line to an outer curved surface through a widthwise end of a crown before the inside of the tire is pressurized, R.sub.1' is its corresponding radius of curvature after the inside of the tire has been pressurized, R.sub.2 is a radius of curvature of an outer profile of the crown in the vertical center section through the rotational axis of the tire before the inside of the tire is pressurized, R.sub.2' is its corresponding radius of curvature after the inside of the tire has been pressurized, W is the maximum width of the tire in the vertical center section through the rotational axis of the tire before the inside of the tire is pressurized, and W' is its corresponding maximum width of the tire after the inside of the tire has been pressurized.
摘要:
A re-treading method and an apparatus therefor can detect a deviation amount of the position distant by a required tread length from the leading edge of the tread material from a predetermined pattern position near that position planned to be cut, cut the tread material at the at the predetermined position, wind the cut-out tread material on the outer circumference of the base tire while adjusting the length of the tread material by applying thereto a substantially uniform tensile or compressive force, and unite the leading and trailing edges of the tread material wound on the base tire.
摘要:
A resin composition for sealing liquid crystal cells which contains as essential components a rubber-modified unsaturated compound obtained by grafting a monomer having at least one polymerizable ethylenically unsaturated bond in a molecule with at least one rubber selected from acrylic rubber, silicone rubber, urethane rubber and conjugated diene rubber, and a coupling agent, a filler and a photopolymerization initiator. The rubber contained in the rubber modified unsaturated compound has a particle diameter of 0.2-5 .mu.m and a number average molecular weight of 1000-100,000, and the rubber content in the compound is 0.5-45% by weight based on the rubber modified unsaturated compound.
摘要:
A combination radial tire for heavy load vehicles comprising a thread portion consisting of a combination of a belt composed of at least two metal cord layers and a carcass composed of at least two organic textile cord plies. In the lower half region of the carcass located at a bead portion, at least one additional reinforcing layer is interposed between the carcass plies and/or another additional reinforcing layer is interposed between the carcass ply and rubber stocks sandwiched between the carcass ply and its turn-up portion, these additional reinforcing layers being extended in parallel with the carcass ply cords and including organic textile cords.