Grooved resolver rotor to pump hub connection and method

A method of assembling a resolver rotor to a hub of a transmission assembly, the method comprising:

• forming at least one generally axially extending groove in an outer surface of the hub, the at least one groove extending at an assembly angle greater than 0 degrees relative to an axial direction from a hub end toward a hub base, the assembly angle being positive in a direction that is adapted to be opposite to a rotation direction of the hub;
• forming at least one projection on an inner surface of the resolver rotor, the at least one projection being configured to have an interference fit with the at least one groove upon assembling of the resolver rotor onto the hub;
• and
• assembling the resolver rotor onto the hub with the at least one projection traveling along and interfering with a portion of the at least one groove as the resolver rotor moves to a seated position toward the hub base;
• wherein, during the assembling of the resolver rotor onto the hub, a projection free portion of the inner surface of the resolver rotor is initially guided onto the outer surface of the hub.