Transmission device

A transmission device comprising a transmission unit,

• the transmission unit including:
• a gear reducer;
• and
• a differential device whose differential case receives an output of the gear reducer,
• the differential device being arranged on ene side a first side in an axial direction and the gear reducer being arranged on the other side a second side in the axial direction, the second side being opposite to the first side in the axial direction,
• the transmission unit being housed inside a transmission case with an oil storing part at a bottom part of the transmission case, the gear reducer comprising:
• a sun gear;
• a ring gear arranged concentrically to the sun gear and fixed to the transmission case;
• two or more planetary gears integrally including large-diameter gear parts meshing with the sun gear and small-diameter gear parts meshing with the ring gear, and
• a carrier rotatably supporting the two or more planetary gears to rotate integrally with the differential case,
• the differential case including:
• a body part housing a differential mechanism therein and capable of storing an oil;
• an oil introducing port open to the one side first side in the axial direction of the body part and communicating with an inside of the body part;
• and
• an oil discharging port open to the other side second side in the axial direction of the body part to thereby allow discharge of a stored oil inside the body part into the transmission case,
• each large-diameter gear part, which revolves in a same direction as the carrier rotates, being arranged such that a bottom part of the each large-diameter gear part in a revolution trajectory is dipped below an oil storing surface of the oil storing part, and
• a first oil guide being provided to the transmission case so as to extend toward the one side first side in the axial direction from a position radially outward of the revolution trajectory for capturing the oil lifted up from the oil storing part by the large-diameter gear parts revolving and for guiding the same to the oil introducing port.