MANUFACTURE OF GEAR MADE OF FIBER REINFORCED PLASTIC

PURPOSE:To obtain fiber reinforced plastic gears with high strength by a method wherein a tubular body is formed by braiding with a reinforcing long fiber bundle and, after that, impregnated with resin and then concave and convex parts are longitudinally and repeatedly formed on the tubular body so as to be pressed down axially and tightly while being heated in order to form a laminated plate, which is then machined for generating gears. CONSTITUTION:The tubular reinforcing fiber bundle 1 is formed with reinforcing fibers such as carbon fibers, glass fibers, Kevlar or the like by means of a braider or a braiding machine and, after that, impregnated with thermosetting resin such as epoxy or the like or thermoplastic resin such as polysulfone or the like and formed continuous crest and trough parts by indenting or more concretely positions A1, A2,..., which are marked out in the axial direction of the fiber bundle 1 at equal intervals, are squeezed to form the trough parts and positions B1, B2,..., which are marked out between positions A1, A2,..., are remained as they are to form the crest parts. Next, the desired fiber bundle 1 is pressed down axially and tightly while being heated in order to form the laminated plate, which is then machined for obtaining the desired gears.