| 摘要 |
<p>PURPOSE:To positively prevent a worm wheel from moving in the axial direction, and improve the assembling property for holding the worm wheel by holding the worm wheel by a case body and a holding body. CONSTITUTION:A worm wheel 9 is engaged with a worm gear 61, a thread groove 12 is formed on the inner peripheral surface of a hole and a male thread 28 is formed on the outer peripheral surface, and a flange 10 is projected from the outer peripheral surface. A holding shaft 27 is screwed into the thread 28, and a shaft body 26 consisting of an adjusting shaft is rotatably supported in the holding shaft. Further, an abutting part 22a is allowed to abut on the worm wheel 9, and a holding body 21 has an engaging part allowing the sliding- engaging part of the shaft body 26 to engage the holding body slidably in the axial direction. Furthermore, a case body 6 for fixing the holding body 21 is provided, the worm wheel 9 is rotatably held from the front and rear sides in state where it is caught between the holding body 21 and the case body 6, and thus the shaft body 26 is moved in the axial direction by rotation of the worm wheel 9.</p> |
