公开(公告)号：EP4380008A1

公开(公告)日：2024-06-05

申请号：EP22848970.4

申请日：2022-04-22

Applicant: NHK Spring Co., Ltd.

Inventor： KAMEDA, Youhei ,  MATSUDA, Tsuyoshi ,  MINEDA. Yoshikazu ,  NAKAYAMA, Soichi

IPC: H02K1/278

CPC classification number: H02K1/278

Abstract: In the disclosure, a rotor having a high productivity rate for a magnet reinforcement tube and for which it is easy to ensure strength is obtained.
This rotor includes a rotor shaft, a permanent magnet held at an outer periphery of the rotor shaft, and a magnet reinforcement tube (24) formed in a cylindrical shape and covering the permanent magnet from an outer peripheral side of the permanent magnet. The magnet reinforcement tube (24) includes plural layers (24A, 24B, 24C, and 24D) layered in a radial direction, and has plural fiber sheets (26) wound individually for each layer (24A, 24B, 24C, and 24D), and each fiber sheet (26) being solidified with resin.

公开(公告)号：EP4502415A1

公开(公告)日：2025-02-05

申请号：EP23774483.4

申请日：2023-03-06

Applicant: NHK Spring Co., Ltd.

Inventor： NISHIZAWA, Shinichi ,  IBANO, Daisuke ,  MATSUDA, Tsuyoshi ,  ARISAKA, Norifumi ,  MURAMATSU, Shun ,  ITO, Chihiro ,  SUZUKI, Takuto ,  KINOSHITA, Masatake ,  KAWASAKI, Asuka

IPC: F16F1/06 ,  F16F1/08 ,  F16F1/12

Abstract: A coil spring (1) includes a wire rod (2) and an elastic coat (60) provided on the wire rod (2). The coil spring (1) includes a coil section (33) including a plurality of coil portions. The wire rod (2) includes a round cross-sectional portion (30), a cross-section varying portion (32), and a rectangular cross-sectional portion (31) along the longitudinal direction of the wire rod (2). The cross section (S2) of the rectangular cross-sectional portion (31) is substantially square and has a first plane (41a) and a second plane (42a). The first plane (41a) and the second plane (42a) oppose each other in the coil section (33). The elastic coat (60) is provided on at least one of the first plane (41a) and the second plane (42a). The elastic coat (60) is continuous from the round cross-sectional portion (30) to the cross-section varying portion (32) and the rectangular cross-sectional portion (31).

公开(公告)号：EP4353789A1

公开(公告)日：2024-04-17

申请号：EP22820358.4

申请日：2022-06-10

Applicant: NHK Spring Co., Ltd.

Inventor： IBANO, Daisuke ,  MATSUDA, Tsuyoshi ,  ARISAKA, Norihumi

IPC: C09D175/04 ,  C09D201/00 ,  F16F1/12 ,  F16F1/24

CPC classification number: F16F1/24 ,  F16F1/12 ,  C09D201/00 ,  C09D175/04

Abstract: A coating agent, a cured product of which after curing having a tear strength, at each of 25°C and 80°C, of 20 kN/m or more, and having a type A durometer hardness at 25°C of from 30 to 100, and a spring using the same.