公开(公告)号：EP3438494A1

公开(公告)日：2019-02-06

申请号：EP17775323.3

申请日：2017-03-29

Applicant: NHK Spring Co., Ltd.

Inventor： UMEZAWA, Masahiro ,  TAKEDA, Daisuke

IPC: F16F1/06 ,  B60G11/16 ,  F16F1/12 ,  F16F9/32

Abstract: A hollow coil spring (10) is made of a hollow wire (20) in which a terminal sealed portion (30) is formed on an end portion (20a) of the wire (20). The terminal sealed portion (30) has a rotationally symmetric shape in which an axis (X1) passing through the center of the wire (20) is the symmetric axis. The hollow coil spring (10) includes an end wall portion (41), and an end face arc-shaped curved surface (42). The end wall portion (41) includes an end face (40) perpendicular to the axis (X1). A distal-end-center closure portion (43) is formed on the axis (X1) at the center of the end wall portion (41). A spring seat (11) includes a base member (50) and a sheet member (51). An end turn portion (10a) of the hollow coil spring (10) is in contact with the sheet member (51). The end face (40) of the end turn portion (10a) is opposed to a stopper wall (52) of the spring seat (11).

公开(公告)号：EP3438495A1

公开(公告)日：2019-02-06

申请号：EP17775324.1

申请日：2017-03-29

Applicant: NHK Spring Co., Ltd.

Inventor： UMEZAWA, Masahiro ,  TAKEDA, Daisuke

IPC: F16F1/06 ,  B60G11/14 ,  B60G21/045 ,  B60G21/055 ,  F16F1/02 ,  F16F1/14

Abstract: On an end portion (20a) of a hollow rod (20), which is a material of a hollow coil spring (10), a terminal sealed portion (30) is formed. The terminal sealed portion (30) has a rotationally symmetric shape in which an axis (X1) passing through the center of the rod (20) is a symmetric axis. The terminal sealed portion (30) includes an end wall portion (41), and a distal-end-center closure portion (43) formed on the axis (X1). In the distal-end-center closure portion (43), a distal end opening portion of the spin-formed rod (20) is joined together and formed as an integral part. On the axis (X1) at the inner surface of the end wall portion (41), a recess (45) having a rotationally symmetric shape in which the axis (X1) is the symmetric axis is formed. A thickness (t) of the recess (45) of the end wall portion (41) is reduced toward the axis (X1) .