COIL SPRING

摘要

A coil spring has an effective section (11) that functions as a spring when a load in a coil axis direction has been applied, end turn sections (12) that are formed on both ends of the effective section (11), and rising sections (13) that are formed between the effective section (11) and the end turn sections (12), wherein the rising sections (13) are formed in such a way that, when ¸1 represents the pitch angle of the rising sections (13) and ¸2 represents the pitch angle of the effective section (11), pitch angle ¸1 > pitch angle ¸2 holds true in at least one of the rising sections (13).