Fibre reinforced plastics power transmission shaft
AssigneeCiba-Geigy Corporation
InventorsAlfred Puck, Peter Voirol
Life of this patent
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Abstract
A process for producing reinforced plastics tube for use, inter alia, as a transmission shaft wherein the tube is produced by winding on to a core reinforcing fibres preferably of carbon impregnated with a curable plastics at predetermined winding angles <35.degree. and then winding on to the reinforcing fibres at angles between .+-.80.degree. and .+-.90.degree. a peripheral winding of a material which is relatively resilient with respect to the reinforcing fibres and which has a high coefficient of thermal expansion. The tube so formed is then heat cured. Fittings are secured to the ends of the tube and the ends may be reinforced with a carbon fibre structure.
Claims20
A power transmission shaft, comprising a tube of carbon fibre reinforced plastics, fittings secured to its two ends and at each end of the tube a wall reinforcement of carbon fibre reinforced plastics tapering substantially gradually towards the middle of the tube, the wall reinforcement fibre structure being similar to that of the tube so that the tube and the wall reinforcements have at least approximately the same anisotropic behaviour, and radial bolts located in the region of the wall reinforcements securing said fittings to said tube.
A power transmission shaft, comprising a tube formed by carbon fibres oriented at a predetermined winding angle to the tube axis and a peripheral winding of material which is relatively resilient with respect to the reinforcing fibres and which has a high coefficient of thermal expansion wound over said carbon fibres and oriented at an angle in the range .+-.80 to .+-.90.degree. to the tube axis, a wall reinforcement at each end of said tube formed of carbon fibre reinforced plastics and tapering substantially gradually towards the middle of the tube, the wall reinforcement fibre structure being similar to that of the tube so that the tube and the wall reinforcements have at least approximately the same anisotropic behaviour, fittings at each end of the tube and radial bolts located in the region of the wall reinforcements securing said fittings to said tube.
A power transmission shaft comprising a plastics tube reinforced with fibres of high stiffness and low specific gravity, oriented at a winding angle of max..+-.30.degree. to the tube axis.
Dependencies are inferred from the claim text.