COOLANT-CONTAINING HOLLOW POPPET VALVE AND PROCESS FOR PRODUCING THE SAME

Title:

COOLANT-CONTAINING HOLLOW POPPET VALVE AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2007/057946

Kind Code:

A1

Abstract:

This invention provides a coolant-containing hollow poppet valve, which, in use, in consideration of a temperature distribution caused in each part of the valve, causes a lowering in fatigue strength and creep strength in the valve at its site exposed to high temperatures falling within the tolerance of design standard, and, in consideration of required properties at the other valve sites, holds abrasion resistance and strength, and a process for producing the same. An improvement in high temperature resistance, abrasion resistance and strength depending upon properties required in each site can be realized by conducting a cold drawing step and an intermediate annealing step to bring the Vickers hardnesses of a cylindrical shaft part (12) and a fillet-shaped head part (14) open in a flare form to the other end of the shaft part (12) to approximately not less than 250 Hv and not more than 350 Hv, and approximately not less than 350 Hv, respectively, and conducting cold pressing to bring the Vickers hardness of a face part (15) in the outer periphery of the opening to not less than 380 Hv.

Inventors:

UCHIYAMA TAKEHIKO (JP)
MURAYAMA TAKEMI (JP)
ANDO TERUAKI (JP)

Application Number:

PCT/JP2005/020975

Publication Date:

May 24, 2007

Filing Date:

November 15, 2005

Export Citation:

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Assignee:

NITTAN VALVA (JP)
UCHIYAMA TAKEHIKO (JP)
MURAYAMA TAKEMI (JP)
ANDO TERUAKI (JP)

International Classes:

F01L3/02; F16K1/36; F16K25/00

Domestic Patent References:

WO2000047876A1

2000-08-17

Foreign References:

JPH08176752A	1996-07-09
JP2001323323A	2001-11-22
JPH1132525A	1999-02-09
JPS6483676A	1989-03-29
EP1152127A1	2001-11-07
EP0911493A2	1999-04-28

Other References: