TORQUE LIMITER AND VALVE ACTUATOR
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United States of America Patent
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N/A
Issued Date -
Aug 11, 2011
app pub date -
Apr 20, 2009
filing date -
Nov 19, 2008
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A torque limiter which can detect torque of both opening and closing of a valve and in which different torque values for opening and closing of the valve can be easily set. The torque limiter is provided with a torque arm having a connection section which is connected to a drive side gear and an intermediate gear and also having an arm section projecting from the connection section; an open side spring portion and a closure side spring means which apply spring force balancing with force acting, in proportion to torque of a load in opening and closing operation of the valve, in the direction of a tangential line at the meshing point of the intermediate gear; an open side torque detection switch and a closure side torque detection switch which are, when torque of a load in opening and closing operation of the valve exceeds a predetermined value, operated by the arm section; and a torque limiter shaft passed through the open and closure side spring portion. The torque limiter shaft is adapted such that spring force of each of the open and closure side spring portion can be adjusted from an end of the torque limiter shaft.
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