| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a frictional engagement device lubrication structure capable of optimizing the flow rate and flow velocity of lubricating oil discharged toward a frictional material while securing a supply quantity of the lubricating oil necessary to lubricate the frictional material.SOLUTION: A spline (36) of a brake hub (34) includes a pair of sidewalls (37, 38) disposed on a front side and a back side of a cylindrical portion (35) in a rotational direction (R), respectively, and protruding radially outward; and a bottom wall (39) extending in the rotational direction (R) and coupling outside-diameter-side end portions (37a, 38a) of the paired sidewalls (37, 38) with each other, a lubricating hole (40) formed of a through-hole is provided in the back-side sidewall (38) at a position away from an inner surface (39a) of the bottom wall (39) by a predetermined dimension (ΔD) to an inside diameter side, and at least part of lubricating oil supplied to an inner circumferential surface (35a) of the cylindrical portion (35) is introduced toward an outer circumferential surface (35b) of the cylindrical portion (35) via the lubricating hole (40) so as to be discharged toward a frictional material (33).</p> |
