Shaft
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsJunichiro YASUI, Masayuki ISHIBASHI, Yoshihiko UKAI
Life of this patent
Estimating the term…
Abstract
At a position of a depth of the first predetermined value from the surface of the gear portion, a surface treatment that satisfies a range of a required hardness defined in advance of the gear portion is performed. A surface treatment is performed at a depth of a second predetermined value from a surface of a bearing portion, the surface treatment satisfying a required hardness in a range prescribed in advance for the bearing portion. Since the second predetermined value is deeper than the first predetermined value, the hardness distribution is made different between the gear portion and the bearing portion. The required hardness in the gear portion and the required hardness in the bearing portion are respectively satisfied.
Claims3
A shaft with which a gear is integrally constituted, the shaft being rotatably supported by a bearing, wherein:
- an inner race of the bearing is integrated with the shaft;
- a surface treatment is performed at a position at a depth of a first predetermined value from a surface of a gear portion of the shaft at which the gear is constituted, the surface treatment satisfying a required hardness in a range prescribed in advance for the gear portion;
- a surface treatment is performed at a position at a depth of a second predetermined value from a surface of a bearing portion of the shaft at which the inner race is constituted, the surface treatment satisfying a required hardness in a range prescribed in advance for the bearing portion;
- and
- the second predetermined value is greater than the first predetermined value.
Dependencies are inferred from the claim text.