| 摘要 |
PURPOSE:To enable to define a wider angular range having lower torsional rigidity without imposing unresonable force to a hub plate and a retaining plate by utilizing two pieces of torsion springs having different rigidity and a stop pin. CONSTITUTION:A hub plate is divided into two pieces of an inner and an outer hub plates. A torsion spring 5 having higher rigidity is equipped within a window 20 of the outer hub plate and a torsion spring 6 having lower rigidity is equipped within a window 21 of the inner hub plate. Further, a stop pin 8 fixed to a retaining plate is slidably inserted into a long aperture 27 on the inner plate. According to this constitution, a wider angular range for torsion having softer twisting characteristics ranging within L1, L'1 may be defined by the spring 6 located at a position having a smaller effective radius while a harder twising characteristic B may be obtained without making the rigidity of the spring 5 especially higher because the effective radius of the location of the spring 5 is big enough to obtain it. |
