Fluid driving device, motor assembly and friction clutch thereof

A friction clutch comprising:

• a fixing member fixed on a rotary shaft;
• a connecting member disposed on the rotary shaft, the connecting member being slidable with respect to the rotary shaft, wherein when the rotary shaft starts rotating, an axial distance between the connecting member and the fixing member changes such that a friction force between the fixing member and the connecting member increases until the connecting member rotates synchronously with the fixing member;
• a loading member disposed on the rotary shaft, the loading member being slidable with respect to the rotary shaft, the loading member and the connecting member being circumferentially positioned;
• and
• a restoring member configured to reduce an amount of change of the axial distance between the fixing member and the connecting member when the rotary shaft stops rotating;
• wherein the friction clutch further comprises a plurality of sliding posts, one of the connecting member and the loading member is fixedly connected with the sliding posts, and the other is slidably engaged with the sliding posts.