Rotary damper, auto part having rotary damper and rotational motion assistant mechanism
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United States of America Patent
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Apr 17, 2007
Issued Date -
N/A
app pub date -
Nov 30, 2005
filing date -
Nov 27, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotary damper is provided which can include a valve (6) which automatically varies a flow rate of a viscous fluid passing through fluid passages (5a, 5b) in correspondence with variation in load. The valve (6) comprises a leaf spring. The flow rate-adjusting portion (6g) constituting the valve (6) is provided so as not to close the fluid passages (5a, 5b) when no load is applied and bends so that its one surface side projects when no load is applied and becomes deformed in a direction in which the fluid passage (5b) is closed when receiving pressure of the viscous fluid on its one surface side. The flow rate of the viscous fluid passing through the fluid passage (5b) is adjusted depending on a degree of deformation of the flow rate-adjusting portion (6g) corresponding to magnitude of pressure of the viscous fluid applied to one surface side of the flow rate-adjusting portion (6g). The flow rate-adjusting portion (6g), when receiving pressure of the viscous fluid on its other surface side, keeps the fluid passages (5a, 5b) open at all times.
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