公开(公告)号：US12253134B2

公开(公告)日：2025-03-18

申请号：US17954907

申请日：2022-09-28

Applicant: NHK SPRING Co., Ltd.

Inventor： Taisuke Suwa ,  Yuichi Shibata ,  Ippei Kokubun ,  Tomoya Sugitani

IPC: F16F3/12

Abstract: A coil spring includes a main body spring and an insulator, the insulator is provided with a support groove which extends around a coil axis and into which a lower end portion of the main body spring is fitted, a lower end portion of the main body spring adheres to an inner surface of the support groove, the inner surface of the support groove is provided with a plurality of spacer protrusions which support an outer peripheral surface of a wire rod, the support groove extends in an angle range of 180° or more and 360° or less around the coil axis, and a ratio of a volume of the spacer protrusions occupying a gap between the inner surface of the support groove and the outer peripheral surface of the wire rod at a center portion in the gap in a circumferential direction around the coil axis is larger than that at the other portions in the gap in the circumferential direction.