To provide a power transmission device which requires no dedicated transmission device on the output side of a power source.
The power transmission device comprises a radial piston pump 7 which is driven as interlocked with relative rotation of a first rotational member 6 and a second rotational member 2. The radial piston pump 7 comprises a piston 11 attached to the first rotational member and an oil chamber 14 in which an oil is intaked and discharged by the operation of the piston 11. At least one of an intake state control valve for controlling intake state of an oil into the oil chamber 14 and a discharge state control valve for controlling discharge state of the oil from the oil chamber 14 is provided. The second rotational member 2 is provided with cams 36 and 81 that are engaged with the piston 11 and operate the piston 11 in the radial direction of the first rotational member 6 and the second rotational member 2.
NOMASA HITOSHI
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