Patent ID: 7326142

Claim:
A partition structure of a power train device, the partition structure partitioned from an external first differential, having first and second external output gears, said partition structure comprising: a second differential coupled with the first differential so as to receive a driving force input to the first differential; a case having a first end facing to the first differential, a second end opposed to the first end and a wall defining the case, the case rotatably housing the second differential and an oil for lubrication of the second differential; a seal member disposed at the first end of the case and between the first differential and the second differential so as to prevent the oil in the case from mixing with an external fluid existing outside with respect to the case and the seal member; a first rotary member coupled with the external first output gear of the first differential, a second rotary member coupling the external second output gear of the first differential with an input member of the second differential, the second rotary member being disposed coaxially interior to the first rotary member; and an output member for output of the second differential, the output member being disposed coaxially interior to the second rotary member; wherein the seal member includes a first seal disposed between the case and the first rotary member, a second seal disposed between the first rotary member and the second rotary member and a third seal disposed between the second rotary member and the output member.