Characteristics of temperature and speed dependence

     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 characteristic. The damper has the property that the torque changes with the difference in temperature. When the temperature is higher, the movement is faster, the temperature is lower, the movement is 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 characteristics of temperature TD 14. At 23 degrees, closing time is 6.5 seconds, and at 40 degrees, closing time is 6 seconds, even at 0 degrees, it is 7.3 seconds. If the temperature goes up and the viscosity of the 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 etc, you should consider the speed dependence of the damper.



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