| 摘要 |
An impact absorbing device has fixed discs and rotary discs alternately and coaxially disposed. Each disc has two surfaces, and two surfaces of each pair of fixed and rotary discs face each other through a lubricant. Each surface has dimples, respectively, surrounded by concave portions. A position of each dimple in the rotary discs is differentiated from a position of any dimple of the fixed discs in a radial direction of the discs. In response to an impact given to the rotary discs, the rotary discs are rotated on the fixed discs against a frictional force between the discs to absorb the impact. During this rotation, each dimple of the rotary discs is moved along a circumferential direction of the discs, and no concave portions of the rotary discs are placed just on the concave portions of the fixed discs.
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