초록 ▼

A rotary damper ( 10 ) includes a stationary member ( 12 ) and a rotating member ( 14 ) provided within the stationary member ( 12 ) so that a gap ( 16 ) is defined between the rotating member ( 14 ) and the stationary member ( 12 ). The rotating member ( 14 ) further includes a central shaft ( 18 )

A rotary damper ( 10 ) includes a stationary member ( 12 ) and a rotating member ( 14 ) provided within the stationary member ( 12 ) so that a gap ( 16 ) is defined between the rotating member ( 14 ) and the stationary member ( 12 ). The rotating member ( 14 ) further includes a central shaft ( 18 ) provided therein. A viscous fluid ( 19 ) is provided in the gap ( 16 ) and has an associated shear that provides a velocity damping within the gap ( 16 ). A differential growth in the gap ( 16 ) caused by temperature variation compensates for temperature damping variation. A compliant member ( 20 ) is provided within the stationary member ( 12 ) for providing thermal compensation. A secondary hermetic seal ( 26 ) is provided on the stationary member ( 12 ) for permitting limited rotation, defining a vacuum environment and preventing viscous fluid leakage to an external environment.

대표청구항 ▼

1. A rotary damper comprising:a housing having at least an inner surface, an outer surface, and a shaft opening extending between the housing inner and outer surfaces;a shaft rotationally mounted to the housing and disposed at least partially within the shaft opening to define a viscous fluid passag

1. A rotary damper comprising:a housing having at least an inner surface, an outer surface, and a shaft opening extending between the housing inner and outer surfaces;a shaft rotationally mounted to the housing and disposed at least partially within the shaft opening to define a viscous fluid passageway therebetween;a rotating member mounted on the shaft and disposed within the housing, the rotating member spaced apart from at least a portion of the housing inner surface to define a gap therebetween, wherein the gap is in fluid communication with the viscous fluid passageway;a viscous fluid disposed at least within the gap; anda compliant member coupled to the housing outer surface and surrounding the viscous fluid passageway, to thereby provide fluid thermal compensation. 2. A rotary damper comprising:rotating member provided within the stationary member so that a gap is defined between the rotating member and the stationary member, wherein the rotating member further includes a central shaft provided therein;a sealing member located on the central shaft that includes:a primary shaft seal for containing the viscous fluid; anda secondary redundant hermetic seal for substantially venting viscous fluid leakage, and that includes vertical convolutes for providing torsional flexibility while substantially preventing viscous fluid leakage to an exterior environment;a viscous fluid provided in the gap and having an associated shear that provides a velocity damping within the gap; anda compliant member positioned on the stationary member for defining a viscous fluid chamber, for maintaining the viscous fluid in the gap and for providing fluid thermal compensation,wherein a differential growth in the gap caused by temperature variation provides temperature damping compensation. 3. The rotary damper of claim 2, wherein the secondary redundant hermetic seal further includes horizontal convolutes for permitting axial changes in length of the vertical convolutes during rotation. 4. A drum damper comprising:a stationary outer housing having a first coefficient of thermal expansion, wherein a hermetic seal is provided on the stationary housing and on a central shaft for permitting limited rotation;a rotating cylinder provided within the stationary outer housing so that a gap is defined therebetween and having a second coefficient of thermal expansion different than the first coefficient of thermal expansion;a viscous fluid provided in the gap having an associated shear that provides a velocity damping within the gap; and a sealing member located on the central shaft includes a primary shaft seal for containing the viscous fluid; and a second redundant hermetic seal for substantially venting viscous fluid leakage, and that includes vertical convolutes for providing torsional flexibility while substantially preventing viscous fluid leakage to an exterior environment;a compliant member positioned on the stationary member for defining a viscous fluid chamber, for maintaining the viscous fluid in the gap and for providing fluid thermal compensation,wherein a differential growth between the stationary outer housing and the rotating cylinder caused by temperature variation compensates for temperature damping variation. 5. The stack damper comprising:a stationary outer housing having a first coefficient of thermal expansion;a plurality of rotating discs provided within the stationary outer housing connected to a central shaft, and having a second coefficient of thermal expansion different than the first coefficient of thermal expansion;a plurality of stationary discs having the second coefficient of thermal expansion, connected to the stationary outer housing and interspersed between the plurality of rotating discs in an alternating configuration with a gap provided therebetween;a viscous fluid provided in the gap having an associated shear that provides a velocity damping within the gap; anda sealing member located on the central shaft, the seali ng member including:a primary shaft seal for containing the viscous fluid, anda second redundant hermetic seal including horizontal and vertical convolutes for providing torsional flexibility while substantially preventing viscous fluid leakage to an exterior environment,wherein a differential growth between the stationary outer housing, the plurality of rotating discs and the plurality of stationary discs caused by temperature variation compensates for temperature damping variation.