| 摘要 |
<p>The structure has a recess portion whose ends (120-1,120-2) are faced to a spherical segment-shaped portion (140-1,140-2) for arranging spherical segment-shaped surface portions (170-1,170-2). Housing (180) has two inner spaces (190) which is faced to spherical segment-shaped surface portion (200-1,200-2) whose radius is corresponding to shaft couplings (110-1,110-2), such that shaft couplings, spherical segment-shaped surface portions, spherical segment-shaped portions and spherical segment-shaped outer sections (210) are corresponded to common center (150) of housing.</p> |
