Patent ID: 7980360

Claim:
A transmission system comprising: a casing configured to receive lubricating oil having a prescribed specific gravity with the lubricating oil being accumulated at a bottom part of the casing when the transmission system is installed in a vehicle; a first shaft member disposed in the casing; a second shaft member disposed in the casing and extending parallel to the first shaft member; a third shaft member disposed in the casing and extending parallel to the first and second shaft members; a first rotating gear member mounted on the first shaft member; a second rotating gear member mounted on the second shaft member and engaging with the first rotating gear member; and a projecting support portion supporting a first end of the third shaft member, and the projecting support portion projecting inwardly into the casing such that at least a part of the projecting support portion is disposed below an oil level of the lubricating oil accumulated at the bottom part in the casing with the projecting support portion being disposed in a position facing a circumferential surface of the first rotating gear member, the projecting support portion having a prescribed specific gravity that is lower than the specific gravity of the lubricating oil, the part of the projecting support portion facing the circumferential surface of the first rotating gear member having a shape corresponding to a shape of at least a part of the circumferential surface of the first rotating gear member.