Wet clutch friction plate and multiple disc friction clutch apparatus

Abstract

A wet clutch friction plate comprises a metal plate connected to a driving side, friction material layer(s) fixed to one or both side surface(s) thereof. A discharge groove is formed on one of the friction material layers and has an inclination against the direction of rotation from the inner peripheral side toward the outer peripheral side, for discharging lubricating oil from the inner peripheral side to the outer peripheral side, and an inflow groove is formed on the same or other friction material layer to face the discharge groove to receive the lubricating oil from the outer peripheral side to the inner peripheral side. A multiple disc friction clutch apparatus fastened or released by an action of a piston, comprises a clutch drum, a clutch hub, driven plates spline-fitted on the clutch drum, and drive plates spline-fitted on the clutch hub, the drive plate being the wet clutch friction plate.

Dependencies are inferred from the claim text.