Braking device
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United States of America Patent
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Sep 27, 2016
Grant Date -
May 28, 2015
app pub date -
Mar 11, 2013
filing date -
May 22, 2012
priority date (Note) -
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Abstract
A braking device capable of effectively causing a shearing stress of a magnetorheological fluid to act on both surfaces of the rotation body is provided. The present invention provides a braking device including a first soft magnetic material (1), a coil (3) attached to the first soft magnetic material (1), a second soft magnetic material (2), a activation chamber (4) formed between the first soft magnetic material (1) and the second soft magnetic material (2), and a rotation body (5) provided inside of the activation chamber (4), and a magnetorheological fluid (6) filling a gap between the rotation body (5) and the first soft magnetic material (1) and a gap between the rotation body (5) and the second soft magnetic material (2), wherein the rotation body (5) includes low magnetoresistive parts (5a, 5b) made of a soft magnetic material and a high magnetoresistive part (5c) in which a magnetic flux is less likely to flow, and the high magnetoresistive part (5c) is provided at a portion of the rotation body (5) facing the coil (3).
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