A rotary damper is filled with a viscous fluid, such as a silicone oil or grease, and its torque is determined by the viscosity of the fluid and the shape of the rotor rotating inside the device.
There are two types of rotary dampers: continuous and non-continuous. Both of them operate by rotation about a single axis, rotary dampers can provide resistance in clockwise (one-way), anti-clockwise (one-way) or both (two-ways) directions.
Continuous dampers can freely rotate beyond 360°, while non-continuous dampers cannot rotate beyond 360°.
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