TORSION BAR AND PRODUCTION METHOD THEREFOR

Title:

TORSION BAR AND PRODUCTION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2022/131374

Kind Code:

A1

Abstract:

The present invention is designed to improve fatigue strength and suppress the occurrence of surface cracks due to repeated use.　This torsion bar 10 is subjected to heat treatment so that the hardness distribution, in the cross sectional direction, is lower in the surface than in the center thereof. More specifically, the quench depth extends to the center, thus increasing the yield point and improving the fatigue strength. Meanwhile, the toughness of the surface is relatively higher than the center, and this makes it less likely for cracks to occur due to repeated use. Furthermore, the hardness of the surface is relatively lower than the center, and this makes it easier to apply detent processing.

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Inventors:

YOSHIDA SEIYA (JP)
KUWATA KATSUYOSHI (JP)
MAKITA SOICHI (JP)
USHIO NOBUHIRO (JP)
FUJITA ETSUNORI (JP)

Application Number:

PCT/JP2021/046819

Publication Date:

June 23, 2022

Filing Date:

December 17, 2021

Export Citation:

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Assignee:

DELTA KOGYO CO (JP)

International Classes:

B24C1/10; B23K26/21; B60G21/055; B60N2/54; C21D9/00; C21D9/02; F16F1/02; F16F1/14

Domestic Patent References:

WO2017169234A1

2017-10-05

Foreign References:

JPS61218843A	1986-09-29
JP2010133558A	2010-06-17
JP2001055035A	2001-02-27
JPS4872923A	1973-10-02
JP2006349080A	2006-12-28
JP2010179719A	2010-08-19
JP2010179720A	2010-08-19

Attorney, Agent or Firm:

MUGISHIMA Takashi (JP)

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