Title:
PRODUCTION METHOD FOR COIL SPRING, AND SUSPENSION DEVICE FOR SADDLE-RIDDEN VEHICLE
Document Type and Number:
WIPO Patent Application WO/2021/192010
Kind Code:
A1
Abstract:
This production method for a coil spring (20) comprises a shot peening step in which shot peening is performed on a coil spring (30), a compression step in which the coil spring (30) that underwent the shot peening step is compressed to a specified length, and a stress shot peening step in which stress shot peening is further performed on the coil spring (30) that underwent the compression step while said coil spring (30) is in a compressed state, wherein when L is the free length of the coil spring (30) after completion of the stress shot peening step, the free length of the coil spring (30) after completion of the stress shot peening step maintains a state equal to or less than L. Preferably, the shot peening step is performed at least twice while the shot peening conditions are changed. More preferably, the stress shot peening step is performed using cold-working.
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Inventors:
KAMEDA HIROKATSU (JP)
Application Number:
PCT/JP2020/012931
Publication Date:
September 30, 2021
Filing Date:
March 24, 2020
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F16F9/32; F16F1/06
Domestic Patent References:
| WO2000075381A1 | 2000-12-14 |
Foreign References:
| JPH05148537A | 1993-06-15 | |||
| JP2011247276A | 2011-12-08 | |||
| JP2003148531A | 2003-05-21 | |||
| JP2016008678A | 2016-01-18 |
Attorney, Agent or Firm:
SHIMODA, Yo-ichiro et al. (JP)
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