Electric power generating device

An electric power generating device, comprising:

• a blade configured to rotate under a flow of a fluid;
• a first generator configured to generate electric power by rotation of the blade;
• and
• a differential gear mechanism provided between the blade and the first generator, wherein:
• the differential gear mechanism includes
• a first ring gear connected to the first generator;
• a case configured to rotate integrally with the first ring gear about a first axis,
• a pinion shaft that is supported by the case and that supports a pair of pinion gears to be rotatable about a second axis orthogonal to the first axis,
• a first drive shaft that is disposed along the first axis, and that includes at one end a first side gear that engages the pinion gears, and also of which another end is connected to the blade, and
• a second drive shaft that is disposed along the first axis and that includes at one end a second side gear engaged with the pinion gears and disposed facing the first side gear;
• the one end of the second drive shaft is provided with an interference portion extending toward the pinion shaft;
• and
• the interference portion contacts the pinion shaft and faces in a direction along a third axis that is orthogonal to the first axis and the second axis.