| 摘要 |
<p>[Problem] To provide a method for manufacturing a telescopic shaft having a coated section which reduces sliding resistance, the telescopic shaft being configured in such a manner that a variation in the sliding resistance depending on the position of sliding of the telescopic shaft is reduced and that lubricating oil exhibits satisfactory lubricating performance. [Solution] Clearance sections (613) are formed in a coated section (61) so that portions of the tooth flanks (412) of the tooth grooves (41) of a female shaft (16B), the portions being located near the tooth tops (411A) between the tooth grooves (41), do not come into contact with portions of the coated section (61) on the tooth flanks of protruding teeth (51), the portions being located near the roots of the protruding teeth (51). The amount of plastic deformation obtained by compressing the coated section (61) by subjecting an intermediate shaft (16) to break-in operation is in the range from 1 micrometer to 10 micrometers. This means that the depth (a1) of the clearance sections (613) before the coated section (61) is plastically deformed by compressive stress applied thereto is preferably 10 micrometers or greater. Even after the coated section (61) is plastically deformed, the clearance sections (613) are maintained recessed from a plastically deformable surface (614) by a depth (a2).</p> |
