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US 2025/0026397 A1Published application
Rack shaft, method for manufacturing same, and rack-and-pinion steering gear unit
AssigneeNsk Steering & Control, Inc.
InventorsKittipon ROONGVASHIRA, Yoshifumi KUROKAWA
Life of this patent
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Abstract
A rack portion (21) includes a hardened layer (26) over an entire circumference on a radially outer portion including the rack teeth (20). A depth (tb) of a portion of the hardened layer (26) on an opposite side to the rack teeth (20) in a radial direction is shallower than a depth (ts) of portions of the hardened layer (26) on both sides of the rack teeth (20) in a tooth width direction.
Claims6
A rack shaft comprising:
- a rack portion including rack teeth on an outer circumferential surface, wherein:
- the rack portion has a hardened layer over an entire circumference on a radially outer portion including the rack teeth;
- and
- a depth of a portion of the hardened layer on an opposite side to the rack teeth in a radial direction is shallower than a depth of portions of the hardened layer on both sides of the rack teeth in a tooth width direction.
1 more element
Dependencies are inferred from the claim text.