1) If the rotating shaft and the damper's axis are directly connected, the approximate torque can be calculated based on the following equation if the lid size and the weight are known.
Using the above equation, determine the maximum torque generaged immediately prior to the closing of the lid. Use a prototype to confirm its performance in an actual machine, and determine the torque required. Fine adjustment of the torque can be done by varying the viscosity of the oil inside the damper.
2) If the damper's rotating shaft and the lid's rotating shaft are connected by a lever or a gear, the results of the aforementioned torque calculation will vary according to the lever ratio or gear ratio. If the gear ratio is 1:n, a damper torque that is n times the regular damper torque will be required.