| 摘要 |
<P>PROBLEM TO BE SOLVED: To make it hard to cause play around a key by shortening a shaft length with a penetrating key to constrain the abrasions between the key and a through-hole and between the key and a depressed groove to a small amount. <P>SOLUTION: A through-hole 15 penetrating radially a shaft 12 is provided and then depressed grooves 17 are provided at two places on an inner circumferential surface of a cylindrical portion 16 of a flange 13. A penetrating key 14 is driven into the through-hole 15 and both ends of the penetrating key 14 are each fitted into the respective depressed grooves 17 to thereby couple the shaft 12 and the flange 13. The penetrating key 14 is made up of a first key member 19 and a second key member 20 where the penetrating key 14 is radially divided into two portions. A trapezoidal cross-sectional protrusion 21 is formed at an apical end of the first key member 19, while a depression 22 is formed at an apical end of the second key member 20. A falling inclined angle θ2 of a sloping surface 22a in a depression 22 is made lager by several degrees than a rising inclined angle θ1 of a sloping surface 21a in the depression 21. <P>COPYRIGHT: (C)2010,JPO&INPIT |
