Patent ID: 8539919
Filing Date: 2013-09-24
Classification: F01L,F16F

Abstract:
1. A fluid brake device comprising: a case defining a fluid chamber inside; magnetic viscosity fluid kept in the fluid chamber, the magnetic viscosity fluid having a viscosity variable in accordance with magnetic flux passing through; a control device which carries out variable control of the viscosity of the magnetic viscosity fluid by varying the magnetic flux; a rotor having a brake shaft penetrating the case to come into contact with the magnetic viscosity fluid so that the rotor receives a braking torque according to the viscosity of the magnetic viscosity fluid; and a sealing sleeve arranged in the case to surround the brake shaft along a rotation direction, a seal gap being defined between the sealing sleeve and the brake shaft and communicating with the fluid chamber, wherein the sealing sleeve has a flux guide that guides magnetic flux to the brake shaft through the seal gap, the brake shaft has