Title:
異形断面コイルばね
Document Type and Number:
Japanese Patent JP5127921
Kind Code:
B2
Abstract:
A coil spring with irregular cross section according to the present invention is made by subjecting a coil wire having an irregular cross section to a fatigue-strength improving treatment including a shot peening treatment after coiling the coil wire into a spring configuration, and the coil spring with irregular cross section has a vertical cross sectional profile whose coil inner-peripheral-side section is expressed by following Equation (1) and Equation (2) in a polar coordinate system and orthogonal coordinate system: x=(LR−Δb)cosnxr θ+Δb (1) y=SR sinnyr θ (2) wherein θ is a deflection angle in said polar coordinate system; and 0°≰θ<90°, 270°≰θ<360°, 0.7≰nxr≰0.9, 0.8≰nyr≰1.0, and 0.1SR≰Δb≰0.3SR; in said Equation (1) and Equation (2). In accordance with the present invention, it is possible to provide a coil spring with irregular cross section that exhibits more uniform and higher fatigue strength along a cross-sectional peripheral direction of the coil wire.
Inventors:
Toshio Isobe
Jun Matsumoto
Jun Matsumoto
Application Number:
JP2010511032A
Publication Date:
January 23, 2013
Filing Date:
February 23, 2009
Export Citation:
Assignee:
Togo Manufacturing Co., Ltd.
International Classes:
F16F1/06; F16D13/64; F16F15/123; F16F15/134; F16H45/02
Domestic Patent References:
JPH02186137A | 1990-07-20 | |||
JPS59190528A | 1984-10-29 | |||
JPS61167728A | 1986-07-29 | |||
JPS60241535A | 1985-11-30 |
Foreign References:
WO2006129710A1 | 2006-12-07 |
Attorney, Agent or Firm:
Hiroshi Okawa