| 摘要 |
PROBLEM TO BE SOLVED: To determine the size of a gear by setting a gear tooth shape to an involute curve at all the time and setting a gear-module while considering transmission torque or an impact coefficient, to determine a gear effective radius while considering a reduction ratio of the gear or a safety coefficient, and to reduce an outer shape of an effective diameter as further as possible although the outer shape becomes significantly large in the case where the transmission torque ot the impact coefficient is large.SOLUTION: In a gear device, conventional involute type gears are changed to a drive pinion gear 9 including a semicircular convex gear on a cross section in a rotating direction and a ring gear 8 with a semicircular concave gear on a cross section in a rotating direction. Further, performance improvement is achieved by adding a torsion angle to the shape of teeth. The gear is changed to a semicircular concave gear by a pinion gear 5 and a side gear 6 and a roller 3 is inserted thereto, thereby achieving larger transmission power in a structure having a number of contact areas in a differential mechanical portion. The semicircular concave and convex gears of the pinion gear and the ring gear are disposed successively while adding a tilt angle thereto. Thus, round torsion for winding around a rotary shaft is added further. |
