Patent ID: 11867242
Assignee: NSK LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 16:
17. A two-stage transmission, comprising:
an input member;
an output member coaxially arranged with the input member;
a planetary gear mechanism arranged between the input member and the output member in a direction of power transmission; and
a power transmission path switching device configured to switch a power transmission path between the input member and the output member; wherein
the power transmission path switching device is the power transmission path switching device according to claim 1;
the planetary gear mechanism comprises:
a sun gear connected to the input member so as to integrally rotate with the input member;
a ring gear arranged around the sun gear and coaxial with the sun gear;
a carrier coaxially arranged with the sun gear and connected to the output member so as to integrally rotate with the output member; and
a plurality of pinion gears configured to engage with the sun gear and the ring gear, and supported by the carrier so as to freely rotate about an own center axis;

one of the friction plate and the separation plate is supported so as to be able to relatively displace in the axial direction but not to be able to relatively rotate with respect to the sun gear or the input member;
the other of the friction plate and the separation plate is supported so as to be able to relatively displace in the axial direction but not to be able to relatively rotate with respect to the carrier or the output member;
one of the first member and the second member is supported so as not to be able to rotate with respect to a portion that does not rotate even during operation; and
the other one of the first member and the second member is supported so as not to be able to rotate with respect to the ring gear.