| 摘要 |
<p>A drive gear capable of being meshed smoothly with a mating gear and a disk device with the drive gear. A pinion gear (610) comprises a generally cylindrical body part (611) and a large number of teeth (612) provided on the outer peripheral surface of the body part (611) and having two opposed contact faces (613, 613) and serves as a drive gear. The pinion gear (610) is fixed, which is one of the method gears: the pinion gear and a large gear of a first gear (630) mating with the pinion gear (610). The large gear (631), or the other gear, is moved axially to mesh the gears with each other. Guide faces (614) to guide the teeth of the large gear (631) to the contact faces (613, 613) are provided at least at one end part of the teeth (612) of the pinion gear (610).</p> |
