Differential apparatus with carrier axially movable relative to an output hub

A differential apparatus for controlling differential between left- and right-hand axles of a vehicle, said differential apparatus comprising:

• a differential mechanism including a ring gear, a plurality of first planetary gears in mesh with said ring gear, a plurality of second planetary gears in mesh with said first planetary gears respectively, a sun gear in mesh with said second planetary gears, and a carrier for rotatably supporting said first and second planetary gears;
• a differential case rotatably supported by a vehicle body, said differential case receiving therein said differential mechanism and being provided with said ring gear of said differential mechanism;
• a first hub provided rotatably within said differential case, said first hub being provided with said sun gear of said differential mechanism and being fixed to one of said axles;
• a second hub provided rotatably within said differential case, said second hub being rotatable relative to said first hub, said second hub being fixed to the other of said axles, said carrier being movable axially relative to said second hub and being integrally rotatable with said second hub.
• a first friction clutch for limiting differential between said carrier and said first hub;
• a cam mechanism for generating an engaging force by which said first friction clutch is engaged, said cam mechanism cooperating with said carrier to engage said first friction clutch;
• and
• a second friction clutch for operating said cam mechanism, wherein said cam mechanism has a cam ring, and wherein said second hub is supported through positioning means such that an outward thrust force in an axial direction is received by said cam ring.