| 摘要 |
PROBLEM TO BE SOLVED: To prevent vibration and sliding wear based upon sliding of an inner tube by improving coaxiality of the inner tube and an outer tube. SOLUTION: Support members 4A and 4B are provided for supporting the inner tube 2 with respect to the outer tube 3, and the support members are composed of a first and second pins 7A and 7B, and first and second pin holes 8A and 8B. The pins and the pin holes are arranged along a radial direction extended from a common axis of the inner and outer tubes. The first pin 7A and the first pin hole 8A are engaged such that they can not relatively move in a tube circumferential direction and a tube axis direction, and they can relatively move in a pin axis direction. The second pin 7B and the second pin hole 8B are engaged such that they can not relatively move in the tube circumferential direction, and they can relatively move in the tube axis direction and a pin axis direction. Coaxiality is maintained from right after assembly of the inner tube and outer tube until usage. A portion of the second pin and the second pin hole is the only sliding part, and by this, the vibration and sliding wear can be substantially suppressed. COPYRIGHT: (C)2006,JPO&NCIPI
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