Planetary gear mechanism

A planetary gear mechanism comprising:

• a sun gear coupled to an input shaft extending in an axial direction;
• a plurality of planetary gears meshed with the sun gear;
• a ring gear supported by a case and meshed with the plurality of planetary gears;
• and
• a planetary carrier rotatably supporting the plurality of planetary gears and coupled to an output shaft extending coaxially with the input shaft, wherein
• the planetary carrier includes:
• a main body connected to the output shaft;
• a plurality of support shafts provided on the main body and supporting the plurality of planetary gears;
• and
• a bearing provided between each of the plurality of support shafts and the corresponding planetary gear,
• the bearing includes:
• at least one inner ring fixed to the support shaft;
• an outer ring fixed to the planetary gear;
• a plurality of rolling elements arranged between the inner ring and the outer ring;
• and
• an oil introduction hole penetrating the inner ring in a radial direction of the support shaft, and
• each of the plurality of support shafts includes:
• a through hole penetrating the planetary carrier along an axis of the support shaft;
• an oil discharge hole formed in a radially outer portion of the planetary carrier and extending from an inner circumferential surface of the through hole to an outer circumferential surface of the support shaft;
• and
• an oil guide portion provided on the inner circumferential surface of the through hole and configured to guide a lubricating oil that flows into the through hole to the oil discharge hole.