Title:
HIGH STRENGTH COIL SPRING AND MULTIPLE SPRING
Document Type and Number:
Japanese Patent JP2016114219
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a high strength coil spring capable of restricting a disturbance of roughness at a spring surface and restricting an expansion of stress concentration at a high stress part.SOLUTION: This invention relates to a coil spring 1 of a coil winding with a surface hardness exceeding 900Hv. A surface roughness at an effective winding part including an inter-coil winding side 1a, a coil inner diameter side 1b and a coil outer diameter side 1c in a sectional direction of the coil winding is less than Rz=2 μm. When this is applied as a valve spring and the like and a certain load is received, a stress concentration at a high stress part caused by a disturbance of roughness is restricted against its expansion, its breakage is prevented or restricted and durability of high strength coil spring is remarkably improved.SELECTED DRAWING: Figure 1
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Inventors:
YONEOKA ATSUSHI
TAKAHASHI FUMIO
TAKAMURA NORITOSHI
TAKAHASHI FUMIO
TAKAMURA NORITOSHI
Application Number:
JP2014255519A
Publication Date:
June 23, 2016
Filing Date:
December 17, 2014
Export Citation:
Assignee:
NHK SPRING CO LTD
International Classes:
F16F1/06; B24C1/10; C21D1/06; C21D7/06; C21D9/02; C23C8/24; F16F1/12; F16F3/04
Domestic Patent References:
| JPH05177544A | 1993-07-20 | |||
| JP2010255759A | 2010-11-11 | |||
| JPH0674273A | 1994-03-15 | |||
| JPH01104719A | 1989-04-21 |
Attorney, Agent or Firm:
Yuichi Sudo
Daisuke Sudo
Daisuke Sudo