Patent ID: 9677637
Date: 2017-06-13
CPC Classifications: B29C,B29K,B29L,B60G,F16F

Claim:
1. A composite coil spring comprising: a coil body extending along a coiled axis, the coil body including a core and a plurality of fiber layers impregnated with a polymer material, the plurality of fiber layers being arranged around the core at different radial distances from the coiled axis, each of the plurality of fiber layers extending around the coiled axis at an oblique fiber angle to the coiled axis, each of the plurality of fiber layers including a number of fibers that is a product of a common base number of fibers multiplied by a positive non-zero integer from a set of positive non-zero integers, and the positive non-zero integer of at least one of the plurality of fiber layers which includes glass fibers is different from the positive non-zero integer of at least one other of the plurality of fiber layers which includes carbon fibers, wherein the core is a fibrous core and includes a number of fibers that is a product of the common base number of fibers multiplied by the positive non-zero integer from the set of positive non-zero integers, and the positive non-zero integer of at least one of the plurality of fiber layers is different from the positive non-zero integer of the fibrous core.