Drive device and drive device unit

A drive device configured to drive a rotor of a flight vehicle to rotate the rotor, the drive device comprising:

• a heat generator configured to generate heat when driven to rotate the rotor;
• a housing accommodating the heat generator and having an outer peripheral surface extending along a rotation axis of a fan, the fan configured to send a gas;
• a radiation fin extending along the outer peripheral surface in an axial direction in which the rotation axis extends, and configured to release the heat from the heat generator to the gas that flows along the outer peripheral surface due to rotation of the fan;
• a housing cover having a cover inner peripheral surface opposed to the outer peripheral surface and attached to the housing to cover the radiation fin from an outer peripheral side, and
• a cover fin provided on the cover inner peripheral surface, protruding from the cover inner peripheral surface toward the outer peripheral surface, and configured to guide the gas to the inclined fin, wherein
• the radiation fin includes an inclined fin provided on the outer peripheral surface, and
• at least a part of the inclined fin is inclined in a circumferential direction of the rotation axis with respect to the rotation axis.

A drive device unit to be mounted on a flight vehicle, the drive device unit comprising:

• a drive device configured to drive a rotor of the flight vehicle to rotate the rotor;
• and
• a fan configured to rotate about a rotation axis to send a gas and aligned with the drive device along the rotation axis, wherein
• the drive device includes
• a heat generator configured to generate heat when driven to rotate the rotor,
• a housing accommodating the heat generator and having an outer peripheral surface extending along the rotation axis of the fan, the fan configured to send the gas, and
• a radiation fin extending along the outer peripheral surface in an axial direction in which the rotation axis extends, and configured to release the heat from the heat generator to the gas that flows along the outer peripheral surface due to rotation of the fan,
• the radiation fin includes an inclined fin provided on the outer peripheral surface, and
• at least a part of the inclined fin is inclined in a circumferential direction of the rotation axis with respect to the rotation axis;
• the drive device unit further comprising:
• a shroud aligned with the housing along the rotation axis and covering the fan from a radially outer side of the rotation axis;
• and
• a shroud fin provided on an inner peripheral surface of the shroud, protruding from the inner peripheral surface toward the outer peripheral surface, and configured to guide the gas to the inclined fin.