Transmission

Abstract

The present invention provides a transmission device that can lubricate bearings while mitigating increases in the size of the gear case. One embodiment of the present disclosure is a transmission device comprising: a transmission mechanism; and a gear case in which the transmission mechanism is housed. The gear case has a recessed section recessed into the outside of the gear case and an oil catch section provided radially outward from a ring gear as viewed from the axial direction of the ring gear. The recessed section and the oil catch section are located above the rotational axis center of the ring gear. The oil catch section is located ahead of the recessed section in a reference rotation direction of the ring gear.

Claims

1. Transmission mechanism, A gear case housing the aforementioned transmission mechanism, Equipped with, The aforementioned transmission mechanism is, Input gear and, A counter gear having a rotation axis parallel to the 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 located inside the differential case, An input gear bearing that rotatably supports the input gear, A counter gear bearing that rotatably supports the counter gear, A first differential case bearing that rotatably supports the differential case, A second differential case bearing rotatably supports the differential case and is positioned in the axial direction of the ring gear on the opposite side of the ring gear from the first differential case bearing, It has, The aforementioned counter gear is A first gear that meshes with the aforementioned input gear, A second gear having a smaller outer diameter than the first gear and being arranged concentrically with the first gear, and meshing with the ring gear, It has, The gear case has a first case and a second case that sandwich the transmission mechanism in the axial direction of the input gear. The first differential case bearing is mounted on the first case. The first case mentioned above is, A recess is provided on the inner surface of the first case in a region facing the ring gear in the axial direction of the ring gear, and is recessed outwards from the first case in the axial direction of the ring gear, A passage for the first differential case that supplies oil from the recess to the first differential case bearing, An oil capture section provided on the radially outer side of the ring gear when viewed from the axial direction of the ring gear, A supply rib protrudes from the inner surface of the first case in the axial direction of the ring gear and supplies the oil from the oil capture portion to the second case side, It has, The ring gear is a helical gear that is twisted so that when the ring gear rotates in the reference rotation direction, the oil is sent toward the inner surface of the first case. The recess and the oil capture portion are located above the rotation axis of the ring gear. The oil capturing portion is located in front of the recess in the reference rotation direction, The first case is configured such that, when the ring gear rotates in the reference rotation direction, the oil is supplied from the recess to the flow path for the first differential case before it is transferred to the second case side by the supply rib.

2. A transmission device according to claim 1, The second differential case bearing is mounted on the second case. The second case is a transmission device having a passage for the second differential case that supplies the oil from the supply rib to the second differential case bearing.

3. A transmission device according to claim 1 or claim 2, 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. A transmission device in which, of the first and second cases, the case facing the first gear in the axial direction of the counter gear has an input gear passage for supplying the oil scraped up by the first gear to the input gear bearing.

4. A transmission device according to claim 3, The transmission device is a helical gear twisted so that the oil is sent towards the input gear passage when the ring gear rotates in the reference rotation direction.

5. A transmission device according to claim 3, The gear case has a storage rib that faces the counter gear radially outward at a position lower than the rotation axis of the counter gear.

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