To provide a vehicle steering telescopic shaft, smoothly slid by reducing sliding resistance of a male shaft and a female shaft axially moving relatively to each other, and preventing rattling feeling of a steering wheel.
The vehicle steering telescopic shaft 20 is constituted of mutually spline-fitted male spline shaft 21 and a female spline shaft 22. Resin coating 23 is formed to a surface of the spline of the male spline shaft 21. The mutually spline-fitted male spline shaft 21 and a female spline shaft 22 are heated in a heating furnace at an ambient temperature in the furnace of around 150 C, and the temperature state is kept for around one hour. Then, by air-cooling to a room temperature, annealing treatment of the resin coating 23 formed on the surface of the spline of the male spline shaft 21 is performed.
| JP6772619 | Dust cover |
| JP2012020716 | DRIVEN PULLEY UNIT FOR CABLE-TYPE STEERING DEVICE |
| JPH0752808 | STEERING COLUMN |
ARAMAKI HIROTOSHI
UCHIYAMA TAKAHIKO
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