Title:
STEERING RACK AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/043625
Kind Code:
A1
Abstract:
When a punch is pressed down, the inner circumferential surface of a first rack
blank bites into the upper surface of a second rack blank, and reaction in the process
causes the material of the second rack blank to flow upward. This allows the material
to be effectively used to form rack teeth, improving the degree of filling of a
teeth form. Also, because a gap remains between the inner circumferential surface
of the first rack blank and the outer circumferential surface of the second rack
blank when the rack teeth forming is completed, dies are not sealed up. Accordingly,
only a small forming load is required, so that the dies have an extended life. Further,
because the upper surface of the second rack blank bites into the bore of the first
rack blank to integrate the blanks together, the entire rack teeth formed has
increased rigidity.
Inventors:
KOBAYASHI, Kazuto (())
小林 一登 (())
HIROTA, Kotaro (())
小林 一登 (())
HIROTA, Kotaro (())
Application Number:
JP2006/320413
Publication Date:
April 19, 2007
Filing Date:
October 12, 2006
Export Citation:
Assignee:
NSK Ltd. (6-3 Ohsaki 1-chome, Shinagawa-ku Tokyo, 60, 1418560, JP)
日本精工株式会社 (〒60 東京都品川区大崎一丁目６番３号 Tokyo, 1418560, JP)
KOBAYASHI, Kazuto (())
小林 一登 (())
日本精工株式会社 (〒60 東京都品川区大崎一丁目６番３号 Tokyo, 1418560, JP)
KOBAYASHI, Kazuto (())
小林 一登 (())
International Classes:
B21K1/76; B21D17/02; B21D53/88; B62D3/12
Attorney, Agent or Firm:
OGURI, Shohei et al. (Eikoh Patent Office, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo03, Tokyo1050003, JP)
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