Title:
RACK SHAFT, METHOD FOR MANUFACTURING SAME, AND RACK-AND-PINION STEERING GEAR UNIT
Document Type and Number:
WIPO Patent Application WO/2023/026903
Kind Code:
A1
Abstract:
A rack portion (21) comprises a hardened layer (26) provided over the entire circumference in a radially outer portion including rack teeth (20). A depth (tb) of a portion of the hardened layer (26) located on the opposite side of the rack teeth (20) in the radial direction is set smaller than a depth (ts) of portions of the hardened layer (26) positioned on both sides of the rack teeth (20) in the tooth width direction.
Inventors:
ROONGVASHIRA KITTIPON (JP)
KUROKAWA YOSHIFUMI (JP)
KUROKAWA YOSHIFUMI (JP)
Application Number:
PCT/JP2022/030994
Publication Date:
March 02, 2023
Filing Date:
August 16, 2022
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16H55/26; B62D3/12; C21D1/10; C21D1/42; C21D9/32
Foreign References:
| JP2001234245A | 2001-08-28 | |||
| JP2004010956A | 2004-01-15 | |||
| JP2017057442A | 2017-03-23 | |||
| JPH06264992A | 1994-09-20 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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