| 摘要 |
PROBLEM TO BE SOLVED: To provide a mechanically stable torque arm which can be produced easily and less costly, having certain degree of elasticity allowing the torque arm to be adaptable to substantially any gear connection surface shape. SOLUTION: In order to fix the first casing to be driven, a plastic base body 2 has a fitting surface with an insertion hole so that it is positioned on a flat surface. In the second casing of the driving unit, another fittable surface is formed on the plastic base body so that it is similarly positioned on a flat surface. The shell-like integral plastic base body 2 is fabricated by injection molding together with a support web 9 disposed inside the shell. In the plastic base body 2, a bush 4 is injection molded facing perpendicular to a surface 3 fittable to the second casing. The bush 4 can pressurize the second casing, with a fixing means pressurizing the fittable surface 3 by frictional connection. An insertion hole 8 is formed in a flanged edge range 7a of the plastic base body 2. |
