| 摘要 |
<p>A sprocket wheel includes a number of supporting devices (3) each having two protrusions (30) extended radially and inwardly from the rim (11) and offset from a center portion of the rim (11), and each protrusion (30) include a number of levers (31) for forming a number of spaces (32) between the levers (31) and include an inner end portion (35) having an orifice (33), the inner end portions (35) of the protrusions (30) of each supporting device (3) are contact with each other, and the protrusions (30) of the supporting devices (3) are arranged in a stagger way relative to each other for increasing the strength of the sprocket wheel and for dissipating the force to be applied to the sprocket wheel (10).</p> |
