| 摘要 |
A power transmission device capable of transmitting power so that the power is gradually increased in accordance with a rotational speed difference, and a differential gear using the same. When a rotational speed difference occurs between a case (1) and a ball disc (3), the balls (4) move back and forth in the grooves (1b) in the case (1) as they roll along a groove (3b) in the ball disc (3). When the difference between the rotational speeds of the case (1) and ball disc (3) becomes large during this time, the resistance occurring while the balls (4) roll against a viscous fluid (6) increases, and power is transmitted between the case (1) and ball disc (3). During this time, the resistance of the viscous fluid (6) increases in accordance with the moving speed of the balls (4), so that the power being transmitted becomes gradually large in accordance with the rotational speed difference.
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