PURPOSE: To improve the strength and heat resistance by forming an inner core from carbon- or glass-fibrous roving material, covering the inner core with a tube-type outer core, wrapping wire material made of roving material. of the same fiber around the outer core to impregnate it with resin, and providing a covering layer.
CONSTITUTION: A spring element wire 1 is formed by covering an inner core 2 made of carbon- or glass-fibrous roving material with a tube-type outer core 3 made of the same fiber, and wrapping wire 4 made of roving material of the same fiber around the outer core. The spring element wire 1 is, by VARI forming method, imoregnated with cold-liquid addition polymerization type thermosetting resin, and on the outside, a covering layer of the same resin is formed. The formed wire rod 23 is spirally wound around a coil-shaped mold, and then heated and cured into a FRP coil. The coil spring has good workability in the process of manufacture, and is tough.
| JP2010527795 | Continuous nested springs and their manufacture |
| JPWO2005111406 | High pressure fuel pump |
HAYASHI HIROSHI
NAKAGAWA AKIRA
DOI YOSHIHARU
YANO KATSUMI
YANAGIHARA KIYOSHI
TAKAYANAGI TOSHINOBU
IKEDA HIDEO
FUJITA KOICHI
NAGARA MASARU
KURODA SEIKEI KK
TAKAGI SEIKO KK
TOYO KAKOU KK
NAGAE TETSUKOU KK
| JPS59144837A | 1984-08-20 | |||
| JPS59196218A | 1984-11-07 | |||
| JPH01269736A | 1989-10-27 | |||
| JPS5233962A | 1977-03-15 |