RACK BAR IN PRELIMINARY FORM BEFORE QUENCHING AND RACK BAR MANUFACTURING METHOD

Title:

RACK BAR IN PRELIMINARY FORM BEFORE QUENCHING AND RACK BAR MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2019/235239

Kind Code:

A1

Abstract:

An rack bar includes a shaft member having a plurality of rack teeth arranged side by side in an axial direction of the shaft member. In a preliminary form before quenching, the pitch surface of the plurality of rack teeth is twisted around a central axis of the shaft member. This rack bar is then quenched such that the pitch surface is twisted back by the quenching.

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Inventors:

NOMURA MAKOTO (JP)
MATSUMOTO WATARU (JP)
KOYAMA KOJI (JP)

Application Number:

PCT/JP2019/020489

Publication Date:

December 12, 2019

Filing Date:

May 23, 2019

Export Citation:

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Assignee:

NETUREN CO LTD (JP)

International Classes:

B21H5/02; C21D1/06; B21K1/76; B23F1/00; B62D7/00; B62D7/16; C21D1/18; C21D9/00; C21D9/52; F16H55/26

Domestic Patent References:

WO2018168938A1

2018-09-20

Foreign References:

JP2014133924A	2014-07-24
EP0993881A2	2000-04-19
JPS62180018A	1987-08-07
JPS63297524A	1988-12-05
JP2001011536A	2001-01-16
JP2014133924A	2014-07-24
JP2018106843A	2018-07-05

Attorney, Agent or Firm:

KOH-EI PATENT FIRM, P.C. (JP)

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