Abstract:
파단 강도가 우수하고, 그리고 제조가 용이한 환상(annular) 금속 코드, 무단(endless) 금속 벨트 및 환상 금속 코드의 제조 방법을 제공한다. 환상 금속 코드(C1)는, 금속 소선(metal filament;5)을 6개 서로 꼬아서 형성한 스트랜드 재(1)를 소정의 환상 지름으로 감아 시단부를 임시 고정하여 환상 코어부(3)를 형성한 상태로, 환상 코어부(3)로부터 연속한 스트랜드 재(1)를 고리 현상 코어부(3)에 대하여 나선 형상으로 6 회 감음으로써, 환상 코어부(3)의 외주면을 덮는 외층부(4)를 형성하고, 그 후, 스트랜드 재(1)의 시단부와 종단부를 접속 부재(7)를 이용하여 결합시킨다.
Abstract:
An easy-to-produce annular metal cord exhibiting excellent break strength and an endless metal belt are provided. The annular metal cord has an annular core portion (3) and an outer layer portion (4). The annular core portion (3) is formed by bonding the opposite ends of a first strand material (1) consisting of six stranded first metal wires (5). The outer layer portion (4) is formed by winding a second strand material (2) consisting of six stranded second metal wires (6) six turns spirally around the annular core portion (3). The second strand material (2) is wound at a predetermined winding angle with respect to the central axis of the annular core portion (3), wherein the start-of-winding portion and the end-of-winding portion are coupled. Since six second strand materials (2) are not wound but the second strand material (2) are wound six turns, only one second strand material is required and the second strand material is coupled at only one position. Consequently, break strength of the annular metal cord can be enhanced while production is facilitated.
Abstract:
PROBLEM TO BE SOLVED: To provide a steel cord for reinforcement of a rubber material which is capable of improving cut resistance when a blunt or a sharp protuberance is trod upon, without reducing the strength of the cord and without increasing the weight of a tire, and further to provide a tire which applies the steel cord to a belt. SOLUTION: This steel cord for reinforcement of a rubber material has a multi-twisted structure formed by at least two-layer structure whereby multiple sheath strands 2 of multiple twisted wires are twisted around one core strand 1 of multiple twisted wires, and the core strand 1 and sheath strands 2 respectively are comprised of a twisted structure of twisted core wires and sheath wires. The relationship expressed by the formula: 1.8≤[(S×cos 2 α)/är×(ϕ1+ϕ2)}]×100≤4.2 is fulfilled with ϕ1 being the wire diameter of the outer layer of the strand 1; ϕ2 being the wire diameter of the outer layer of the strand 2; r being the distance between the centers of the strands 1 and 2; S being the cross-sectional area of the strand 2; and α being the twisting angle of the strand 2. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a new steel cord improved in buckling performance and penetration of rubber, in which endurance of rubber crawler is especially improved. SOLUTION: The steel cord for rubber crawler is obtained by twisting sheath strands 2 composed of a plurality of filaments 4 around the periphery of one core strand 1 composed of a plurality of filaments 3. In the steel cord, winding angle θ of the sheath strand 2 is ≥12°, preferably 12-25°. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a steel cord especially useful for reinforcement application to tire crowns, able to be efficiently produced with stable quality without causing for any trouble in production as in conventional production, a rubber-steel cord composite and a tire. SOLUTION: The steel cord has a multiple strand structure in which N (N=2-8) strands 2 prepared by twisting two or more element wires 1 are twisted. In the steel cord, ε c is defined by the following formula, wherein d(mm) expresses the diameter of the strand, D(mm) expresses the diameter of a circumscribed circle of the cord and P(mm) expresses a twisting pitch: ε c =√(-b/2+√(b 2 /4-c))-1 [wherein b expresses -1+π 2 (-4R 2 +d 2 )/P 2 ; c expresses π 2 d 2 k(4π 2 R 2 +P 2 )/P 4 ; R expresses (D-d)/2; k expresses tan 2 (π/2-π/N)] and satisfies ε c ≥0.005. The tire has a reinforcing layer using the rubber-steel cord composite as a reinforcing material. COPYRIGHT: (C)2007,JPO&INPIT