| 摘要 |
PROBLEM TO BE SOLVED: To provide a sufficient differential limit force through simple structure without increasing the size of a built-in pump. SOLUTION: A power transmission device comprises a differential mechanism 15 arranged in a case 3 rotationally driven by an engine; a friction clutch 43 to limit differentiation; an actuator 45 to press the clutch 43; a gear pump 47 to drive the actuator; and a pair of one-way clutches 79 and 81 arranged between the rotation input member 65 of the gear pump 47, the sun gear 23 of a differential mechanism 15, and a pinion carrier 31, transmitting only rotation in one-way to the rotation input member 65, and cutting off rotation in an opposite direction.
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