Transmission device

A transmission device comprising:

• a transmission mechanism;
• and
• a gear case that accommodates the transmission mechanism, wherein
• the transmission mechanism includes
• an input gear,
• a counter gear having a rotation axis parallel to a rotation axis of the input gear,
• a ring gear having a rotation axis parallel to the rotation axis of the input gear,
• a differential case fixed to the ring gear,
• a differential mechanism disposed inside the differential case,
• an input gear bearing rotatably supporting the input gear,
• a counter gear bearing rotatably supporting the counter gear, and
• a differential case bearing rotatably supporting the differential case, wherein
• the counter gear includes
• a first gear that meshes with the input gear, and
• a second gear that has an outer diameter smaller than an outer diameter of the first gear, is disposed concentrically with the first gear, and meshes with the ring gear, wherein
• the rotation axis of the counter gear is located above the rotation axis of the input gear and the rotation axis of the ring gear, wherein
• the gear case includes
• a lower guide that faces the ring gear from radially outside at a position lower than the rotation axis of the ring gear and faces the first gear from radially outside at a position lower than the rotation axis of the first gear,
• a catch tank disposed at a position overlapping the input gear from above,
• a main guide that sends oil scraped up by the ring gear to the catch tank when the ring gear rotates in a first direction, and
• a reverse guide that sends the oil scraped up by the first gear after scraped up by the ring gear to the catch tank when the ring gear rotates in a second direction opposite to the first direction, wherein
• the reverse guide is disposed at a position overlapping the first gear in an axial direction of the counter gear, and wherein
• the first gear is a helical gear twisted so that the oil is sent toward the reverse guide when the first gear rotates in the second direction.