Rack bar blank material, rack bar, rack bar blank material manufacturing method, and rack bar manufacturing method
AssigneeNeturen Co., Ltd.
InventorsTakashi YAMAWAKI, Kenichi AOKI
Life of this patent
Estimating the term…
Abstract
A rack bar blank material includes a rack portion configured to mesh with a pinion in an end side of a hollow shaft material in an axial direction, and an end portion which is provided closer to the end side of the hollow shaft material than the rack portion. The end portion has a diameter which is larger than that of a minimum circle embracing a section of the rack portion which is perpendicular to the axial direction and which is equal to that of a shaft portion at the other end side of the shaft material in the axial direction.
Claims12
A rack bar blank material comprising:
- a rack portion configured to mesh with a pinion in an end side of a hollow shaft material in an axial direction;
- and
- an end portion which is provided closer to the end side of the hollow shaft material than the rack portion,
- wherein the end portion has a diameter which is larger than that of a minimum circle embracing a section of the rack portion which is perpendicular to the axial direction and which is equal to that of a shaft portion at the other end side of the hollow shaft material in the axial direction.
A rack bar blank material manufacturing method comprising:
- a pre-forming that forms a small-diameter portion on an end side of a hollow shaft material in an axial direction and an end portion provided closer to the end side of the hollow shaft material in the axial direction than the small-diameter portion and having a diameter which is larger than that of the small-diameter portion and which is equal to that of a shaft portion on the other end side of the hollow shaft material in the axial direction;
- a tooth forming that forms a rack portion configured to mesh with a pinion on the small-diameter portion;
- and
- a grinding that applies an outer diameter grinding to the end portion and the shaft portion, the outer diameter grinding being applied simultaneously to at least part of the shaft portion when the outer diameter grinding is applied to the end portion.
Dependencies are inferred from the claim text.