Torque detector
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKatsuaki Yasui, Masahiko Hasegawa, Yasushi Hisaoka
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Abstract
A torque detector having a simple structure, high accuracy and high rigidity. The torque detector comprises movable bodies whose both ends are fixed to or supported by the first shaft and the second shaft, which are arched and whose center portions are displaced by a change in the curvature of the arch due to a change in the distance between the fixed both ends of the movable bodies according to a relative torsion angle between the first shaft and the second shaft.
Claims18
A torque detector for detecting torque applied to a first shaft and a second shaft which are arranged coaxial to each other and whose ends are opposed to each other, the first shaft and the second shaft being connected together by an elastic member, the torque detector comprising:
- movable bodies, each having one end connected to the first shaft and an other end connected to the second shaft, said movable bodies being arched and having center portions which are displaced in a radial direction, relative to a rotational axis of the first shaft and the second shaft, by a change in a curvature of the arch, due to a change in a distance between both of the ends of each of the movable bodies, according to a relative torsion angle between the first shaft and the second shaft;
- and
- means for detecting the displacement of each of the movable bodies, comprising:
- first means for varying impedance according to the radial displacement of the center portions of each of the movable bodies, positioned to be next to the movable bodies in a radial direction relative to the rotational axis of the first shaft and the second shaft, intervening air gap provided between said movable bodies and said first means, and wherein the movable bodies are positioned closer to the rotational axis than said first means;
- and
- second means, electrically connected to said first means, for obtaining an amount of torque on the elastic member by detecting variation in the impedance of said first means.
A torque detector for detecting torque applied to a first shaft and a second shaft which are arranged coaxial to each other and whose ends are opposed to each other, the first shaft and the second shaft being connected together by an elastic member, the torque detector comprising:
- a movable body, having one end connected to the first shaft and an other end connected to the second shaft, said movable body being arched and having a center portion which is displaced in an axial direction, relative to a rotational axis of the first shaft and the second shaft, by a change in a curvature of the arch, due to a change in a distance between both ends of the movable body, according to a relative torsion angle between the first shaft and the second shaft;
- and
- means for detecting the displacement of the movable body, comprising:
- first means for varying impedance according to the axial displacement of the center portion of the movable body, positioned in a radial direction relative to the rotational axis of the first shaft and the second shaft, to be next to at least the center portion of the movable body along at least a range of displacement that the center portion displaces in the axial direction, an intervening air gap provided between said movable body and said first means;
- and
- second means, electrically connected to said first means, for obtaining an amount of torque on the elastic member by detecting variation in the impedance of said first means.
Dependencies are inferred from the claim text.