公开(公告)号：US11701943B2

公开(公告)日：2023-07-18

申请号：US17696971

申请日：2022-03-17

申请人： NHK SPRING CO., LTD.

发明人： Masahiro Umezawa ,  Daisuke Takeda

IPC分类号： B60G21/055 ,  B60G11/14 ,  F16F1/06 ,  F16F1/14 ,  F16F1/02 ,  B60G21/045 ,  C21D7/06 ,  C21D9/02

CPC分类号： B60G21/055 ,  B60G11/14 ,  B60G21/045 ,  F16F1/02 ,  F16F1/06 ,  F16F1/14 ,  B60G2206/012 ,  B60G2206/427 ,  B60G2206/724 ,  B60G2206/81 ,  B60G2206/8403 ,  C21D7/06 ,  C21D9/02 ,  F16F2224/0208 ,  F16F2226/02 ,  F16F2234/02

摘要： A method for manufacturing a hollow spring member having a hollow steel spring rod having terminal sealed portions at both ends thereof. Each terminal sealed portion has a rotationally symmetric shape in which an axis passing through a center of the spring rod is an axis of symmetry. Each terminal sealed portion has an end wall portion including an end face; an arc-shaped smoothly curved surface between an outer peripheral surface of the spring rod and the end face, and a hermetically closed distal-end-center closure portion on the axis passing through the center of the spring rod. The method includes forming each of the end portions of the spring rod by forming a chamfered portion on an inner or outer peripheral side of the end portion of a hollow wire, the end portion having an opening portion at a distal end, heating the end portion of the hollow wire having the chamfered portion, and spinning the heated end portion to be gathered toward the axis from the outer peripheral side by a jig. The end wall portion, which includes the distal-end-center closure portion, is formed by the distal end of the end portion being joined together on the axis.

公开(公告)号：US11254177B2

公开(公告)日：2022-02-22

申请号：US16145094

申请日：2018-09-27

申请人： NHK SPRING CO., LTD.

发明人： Masahiro Umezawa ,  Daisuke Takeda

IPC分类号： B60G11/16 ,  F16F1/06 ,  F16F1/12 ,  B21D41/04 ,  B21K21/14 ,  F16F9/32

摘要： A hollow coil spring is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.

公开(公告)号：US11685211B2

公开(公告)日：2023-06-27

申请号：US17510669

申请日：2021-10-26

申请人： NHK SPRING CO., LTD.

发明人： Masahiro Umezawa ,  Daisuke Takeda

IPC分类号： F16F1/12 ,  F16F1/06 ,  B60G11/16 ,  B21F35/02 ,  F16F9/32 ,  B21K21/14 ,  B21D41/04

CPC分类号： B60G11/16 ,  B21F35/02 ,  F16F1/06 ,  F16F1/12 ,  F16F1/126 ,  F16F9/32 ,  B21D41/04 ,  B21K21/14 ,  B60G2202/12 ,  B60G2204/124 ,  B60G2206/426 ,  B60G2206/724 ,  F16F2224/0208 ,  F16F2230/0005 ,  F16F2234/02

摘要： A method of manufacturing a hollow coil spring which is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.