US Patent 11396912 Clutch hub assembly with improved oil flow

An automatic transmission includes a clutch hub assembly having a clutch hub and a housing assembly having a housing shaft and a piston dam. The clutch hub may define an inner portion between an outer radial wall, an inner radial wall and a forward axial wall, and extend about a central opening. The clutch hub may further include one or more first oil holes extending through the outer radial wall, one or more second oil holes extending through the inner radial wall, and an oil dam projecting radially inward from the inner radial wall. An oil flow path extends from the central opening through the one or more second oil holes, the inner portion, and the one or more first oil holes.