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Oil type damper

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TLDR
An oil type damper as mentioned in this paper comprises a housing, a rotator formed of a hollow shaft and a braking disk, a flexible membrane, a toothed wheel secured to the leading end of the aforementioned hollow shaft, and oil introduced via the hollow shaft into the housing.
Abstract
An oil type damper comprises a housing, a rotator formed of a hollow shaft and a braking disk, a flexible membrane, a toothed wheel secured to the leading end of the aforementioned hollow shaft, and oil introduced via the hollow shaft into the housing. Since the oil is introduced through the hollow shaft into the housing after the rotator and the flexible membrane have been set in place inside the housing, the work of filling the damper with oil is easy. The flexible membrane absorbs thermal expansion of the oil and precludes otherwise possible oil leakage.

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References
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Patent

Rotor movement damping device

TL;DR: A rotary damping device has a shaft provided at one end with a rotor and the shaft also has a damping portion extending radially as mentioned in this paper, which is rotatably housed and accommodation spaces in the device are filled with oil.
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