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|1. (WO2017170833) COIL SPRING|
|Applicants:||NHK SPRING CO., LTD.
Coil springs (1a, 1b), wherein the end sections in the coil axis direction are provided with a corresponding portion (11) at which the size (hs), in the coil axis direction, of the entirety of a plurality of wire materials adjacent to each other in the coil axis direction is equivalent to the maximum value (Sa) of the spacing, in the coil axis direction, between wire materials adjacent to each other in the coil axis direction in the coil spring. The spacing (Sb), in the coil axis direction, between the corresponding portion and the wire material (12) adjacent to the corresponding portion on the inner side with respect to the coil axis direction is less than the wire height (h) in the effective winding part (13) of the coil spring. In the portion of the end sections in the coil axis direction extending along the direction around the coil axis from the corresponding portion to the side of a terminal part (w1) of the wire material, the spacing (Sc), in the coil axis direction, in relation to the wire material (14) adjacent on the inner side with respect to the coil axis direction gradually decreases from the corresponding portion towards the side of the terminal part of the wire material along the direction around the coil axis.