Patent
Pneumatic radial tire having an improved bead portion reinforcing construction
| العنوان: | Pneumatic radial tire having an improved bead portion reinforcing construction |
|---|---|
| Patent Number: | 4,319,621 |
| تاريخ النشر: | March 16, 1982 |
| Appl. No: | 06/040,823 |
| Application Filed: | May 21, 1979 |
| مستخلص: | A pneumatic radial tire having an improved bead portion reinforcing construction is disclosed. The radial tire comprises a bead portion reinforcing band disposed along the bead portion formed by folding the ply of the carcass body around the bead ring. The bead portion reinforcing band comprises at least one chipper layer. The chipper is composed of a reinforcing element embedded in rubber and formed of 1 to 50 helically formed filaments. The reinforcing element has a modulus of elasticity of 0.029.times.10.sup.4 kg/mm.sup.2 to 1.60.times.10.sup.4 kg/mm.sup.2 and is inclined at a given angle with respect to the ply cords of the carcass body so as to make the chipper as a whole extensible and rigid. |
| Inventors: | Motomura, Kenichi (Higashi-Murayama, JPX); Watanabe, Shigeo (Kokubunji, JPX); Sogi, Toshiyuki (Higashi-Yamato, JPX) |
| Assignees: | Bridgestone Tire Company Limited (Tokyo, JPX) |
| Claim: | What is claimed is |
| Claim: | 1. A pneumatic radial tire having an improved bead portion reinforcing construction comprising; a carcass body having substantially radially arranged ply cords; a belt for reinforcing a crown portion of said carcass body; and a bead portion reinforcing band disposed along a bead portion formed by folding the ply of said carcass body around a bead ring;said bead portion reinforcing band comprising at least one chipper layer; said chipper comprising an extensible reinforcing element embedded in rubber and formed of from 2 to 30 helically formed metal filaments without twisting; said reinforcing element having a modulus of elasticity of 0.029.times.10.sup.4 kg/mm.sup.2 to 1.60.times.10.sup.4 kg/mm.sup.2 and a compression modulus of elasticity of 20 to 300 kg/mm.sup.2 ; each of said filaments having a diameter within the range of 0.1 to 1.0 mm; the ratio of maximum diameter to minimum diameter of said filaments in an outer contour projected on a plane perpendicular to the axial direction of one pitch of the filaments being within the range of 1 to 1.5; the ratio of an average diameter of an outer contour of each of said filaments projected on a plane perpendicular to the axial direction of one pitch of the filament to the filament diameter is within a range of 2 to 20; the rubber of said chipper having a 100% modulus of elasticity of 20 to 90 kg/cm.sup.2 ;and said reinforcing element being embedded in said rubber at ends of 10 to 50 elements5 cm and inclined with respect to the ply cords of said carcass body to make said chipper as a whole extensible but otherwise rigid. |
| Current U.S. Class: | 152/362CS; 152/359 |
| Current International Class: | B60C 1506 |
| Patent References Cited: | 3449199 June 1969 Mead 3682222 August 1972 Alderfer 3841377 October 1974 Montagne 3842883 October 1974 Masson et al. 3964533 June 1976 Arimora et al. 4046183 September 1977 Takahashi et al. 4077454 March 1978 Miyoshi et al. |
| Primary Examiner: | Kimlin, Edward C. |
| Assistant Examiner: | Boland, Lois E. |
| Attorney, Agent or Firm: | Sughrue, Mion, Zinn, Macpeak and Seas |
| رقم الانضمام: | edspgr.04319621 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |