Temperature characteristics and speed characteristics

Oil dampers have characteristics of temperature and speed dependence.

In general, the viscosity of liquid changes greatly with temperature. Especially the viscosity of oil changes markedly as temperature changes. The viscosity decreases as the temperature rises and the viscosity rises as it goes down. This phenomenon is called temperature dependence. The damper has the property that the torque changes with the difference in temperature. When the temperature is higher, the movement is going to be faster and when the temperature is lower, the movement is going to be slower. In other words, damper not affected by temperature can be said to be easy to use damper.

As an example, here is the graph of temperature characteristics TD14 rotary damper. At 23℃ the closing time is approx. 6.5 seconds, and at 40℃ the closing time is approx. 6 seconds, even at 0℃ it is 7.3 seconds. If the temperature goes up and the viscosity of oil drops, it gets faster but it does not go up much.

Also, as the speed goes up the torque increases and we call it speed dependence. The infinite angle damper takes torque with the shear resistance generated by agitating the oil, and this shear resistance increases in proportion to the speed.
This is a speed dependence graph of TD62. You will see that the torque increases as the speed increases. In other words, since it can not be set to the slow down speed assuming that the torque is not matched. When you choose dampers to work for the toilet seat covers, you should consider the speed dependence of the damper.

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Written by Mayu