MECHANISM AND METHOD FOR PROVIDING APPROPRIATE-STRENGTH OPERATION TORQUE FOR COMPONENT

摘要

PROBLEM TO BE SOLVED: To adapt a feed torque to a required torque, save the energy, and dispense with enlargement of a device by upward facing a curve presenting a deceleration coefficient which is a function of a rotation angle and a ratio of the operation torque to a nominal torque so as to form a projecting face and providing a peak between specific angles. SOLUTION: Torque for self-rotating parts by 1/4 turn via the transmission from a member moving along a track is provided. A curve I shows the torque necessary for driving an actuator practically for a large-diameter butterfly stop valve and a curve II shows a torque provided by the actuator. The curve II is desirable to coincide with the curve I as closely as possible. An output spindle is rotated by the torque shown by the curve II so that the driving at lower energy is possible. The peak of the curve II is made to coincide with that of the curve I so that the energy loss in a region of the rotational angle 20 deg.-40 deg. is especially reduced.