Patent ID: 8522940

Claim:
An engageable coupling assembly adapted for use with pressurized fluid, the assembly comprising: first and second coupling members that are supported with respect to each other for relative rotation about a common rotational axis, the coupling members having a first pair of annular faces that oppose each other and define an annular space therebetween, a first face of the first pair having a set of pockets spaced about the rotational axis, a second face of the first pair having a set of locking formations, the coupling members having a second pair of annular faces that oppose each other, a first face of the second pair defining a first set of fluid grooves fluidly communicating the annular space with an exterior surface of the assembly and wherein the fluid grooves are configured to conduct the pressurized fluid from the annular space and out of the assembly in an axial direction during an overrun condition of the assembly, thereby reducing spin losses when the assembly is disengaged wherein a rotating one of the coupling members has the exterior surface, the exterior surface defining a plurality of pumping grooves in fluid communication with the fluid grooves and wherein the pumping grooves are configured to pump the pressurized fluid from the annular space and through the fluid grooves during the overrun condition.