| 摘要 |
The present invention provides a deceleration apparatus comprising: a gear unit having a spiral shaped groove unit; a wheel unit engaged with the groove unit to be rotated and having the receiving grooves spaced on an outer circumferential surface at constant intervals; a ball shaped driving body disposed to be rolled in the receiving groove; a spherical body interposed between the receiving groove and the driving body to reduce rolling resistance; and a separation preventing means maintaining the driving body to prevent the driving body from being separated from the receiving groove. |
