HOLLOW SPRING MEMBER - NHK SPRING CO LTD

Title:

HOLLOW SPRING MEMBER

Document Type and Number:

WIPO Patent Application WO/2017/170790

Kind Code:

A1

Abstract:

A hollow coil spring (10) is formed from a hollow rod (20), which has an end (20a) on which a terminal sealing portion (30) is formed. The terminal sealing portion (30) has rotational symmetry about the axis (X1) passing through the center of the rod (20). The terminal sealing portion (30) has an end wall portion (41) and a leading-end center closed portion (43) formed on the axis (X1). At the leading-end center closed portion (43), the narrow open leading ends of the rod (20) are joined integrally to each other. A recessed portion (45) having rotational symmetry about the axis (X1) is formed in the inner surface of the end wall portion (41) on the axis (X1). The thickness (t) of the recessed portion (45) of the end wall portion (41) becomes smaller with proximity to the axis (X1).

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Inventors:

UMEZAWA MASAHIRO (JP)
TAKEDA DAISUKE (JP)

Application Number:

PCT/JP2017/013098

Publication Date:

October 05, 2017

Filing Date:

March 29, 2017

Export Citation:

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Assignee:

NHK SPRING CO LTD (JP)
YOKOHAMA KIKO CO LTD (JP)

International Classes:

F16F1/06; B60G11/14; B60G21/045; B60G21/055; F16F1/02; F16F1/14

Domestic Patent References:

WO2013175821A1	2013-11-28
WO2012073786A1	2012-06-07

Foreign References:

JPS59160929U	1984-10-27
JP2014043922A	2014-03-13
JPS56158538U	1981-11-26
JPS5911010U	1984-01-24

Other References: