Suspension coil spring

摘要

A suspension coil spring (10) is interposed between an upper seat (22) and a lower seat (24) in a strut type suspension device for a vehicle. The suspension coil spring (10) in a free state is formed such that a coil axis is bent in a V shape at a bent point which is a portion that corresponds to an end turn portion from a spring terminal to R th turn (R is a positive real number). Presuming that a bending angle at the bending point is 0°, at least one of a center of an upper end turn portion and a center of a lower end turn portion is made eccentric in a predetermined eccentric amount (VU, VL) in a predetermined eccentric direction, with respect to an imaginary coil axis (A1). A lead angle of each of the upper end turn portion and the lower end turn portion is set such that each of an upper seating surface (38) and a lower seating surface (40) forms a plane substantially perpendicular to the imaginary coil axis A1. In a state in which the suspension coil spring (10) is interposed between the upper seat (22) and the lower seat (24) in the suspension device and it is compressed along a strut axis, the eccentric direction and the eccentric amount (VU, VL) of each center of the upper end turn portion and the lower end turn portion with respect to the imaginary coil axis (A1) are set such that a spring reaction axis in the suspension device is positioned sufficiently close to a load input axis.