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Patent Searching and Data


Title:
COIL SPRING
Document Type and Number:
Japanese Patent JP2012247013
Kind Code:
A
Abstract:

To provide a coil spring which stably receives a load in a close contact state, in which a close-contact length is shortened by reducing a flatness ratio and in which lateral displacement is suppressed by improving uniformity of stress distribution by continuity of stress dispersion in the circumferential direction of a cross sectional shape.

In the coil spring, for the cross sectional outer peripheral shape of a spring wire 3 wound in a coil shape, a coil outer diameter part 9 and a coil inner diameter part 7 are formed into a super elliptical shape with a major axis (a) and a minor axis (b) expressed by (x/a)α+(y/b)α, the value of α being 2 to 3. A projecting/recessed abutting part 11 is provided on one side of the spring wire 3 in a coil axial line 5 direction, and on the other side, a projecting-arc abutting part 13 is provided, the projecting/recessed abutting part 11 is provided with a recessed part 15 having an arc-shape cross section and a pair of recessed parts 17, 19 having an arc-shape cross section continued to both ends of the recessed part 15 and the coil inner/outer diameter parts 7, 9 respectively, and the projecting abutting part 13 of the coil part adjacent to the pair of convex parts 17, 19 in the coil axial line 5 direction abuts on the pair of projecting parts 17, 19, so that the coil comes in a close contact state.


Inventors:
SASUGA ICHIRO
Application Number:
JP2011119744A
Publication Date:
December 13, 2012
Filing Date:
May 27, 2011
Export Citation:
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Assignee:
NHK SPRING CO LTD
International Classes:
F16F1/06; F16F15/127; F16F15/30; F16H45/02
Domestic Patent References:
JP2008185072A2008-08-14
Foreign References:
EP0596810A11994-05-11
Attorney, Agent or Firm:
Yuichi Sudo
Daisuke Sudo