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Patent Searching and Data


Title:
COMPRESSION COIL SPRING AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/021828
Kind Code:
A1
Abstract:
Provided are a highly durable compression coil spring, which is produced using an inexpensive wire rod while imparting an adequate residual stress to the wire rod, and a method for producing the compression coil spring. The compression coil spring is made of a steel wire rod that contains, by weight, 0.45-0.85% C, 15-2.5% Si, and 0.3-1.0% Mn, and the balance iron and unavoidable impurities, said steel wire rod having an equivalent circle diameter of 1.5-9.0mm. The compression coil spring has a hardness of 570-700HV in any cross-section of the wire rod, an unloaded compressive residual stress equal to or greater than 200MPa on the inner side of the coil spring at a depth of 0.2mm from the surface in substantially the direction of the maximum principal stress when a compressive load is applied to the spring, and an unloaded compressive residual stress equal to or greater than 100MPa at a depth of 0.4mm from the surface.

Inventors:
IKAI KAZUYA (JP)
SHIRAISHI TOHRU (JP)
ONO YUICHIRO (JP)
ONO YOSHIKI (JP)
Application Number:
PCT/JP2012/068965
Publication Date:
February 14, 2013
Filing Date:
July 26, 2012
Export Citation:
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Assignee:
NHK SPRING CO LTD (JP)
IKAI KAZUYA (JP)
SHIRAISHI TOHRU (JP)
ONO YUICHIRO (JP)
ONO YOSHIKI (JP)
International Classes:
C22C38/04; B24C1/10; C21D7/06; C21D9/02; C22C38/54; F16F1/06
Domestic Patent References:
WO2010134657A12010-11-25
Foreign References:
JP2011000664A2011-01-06
JP2003055741A2003-02-26
JPH11241143A1999-09-07
JP2006522214A2006-09-28
JPH05179348A1993-07-20
JPS6127133A1986-02-06
Other References:
See also references of EP 2743366A4
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
End 成 Mikio (JP)
Download PDF:
Claims: