Magnetostrictive torque sensing device
AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsYasuharu Odachi, Katsufumi Tanaka
Life of this patent
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Abstract
A device for detecting torque applied to a rotary shaft. The device has a sensing piece made of a magnetostrictive material and opposite ends for mounting the sensing piece on the rotary shaft. A primary coil is located around the rotary shaft for supplying magnetic flux to the sensing piece. A secondary coil is located around the rotary shaft for sending an electromotive force induced by the magnetic flux of the sensing piece. The electromotive force is measured to determine the torque applied to the shaft.
Claims19
A device for detecting torque applied to a rotary shaft having a longitudinal axis and at least one substantially planar side surface, the device comprising:
- a sensing piece including a magnetostrictive material, the sensing piece being attached to said planar side surface;
- an exciting coil disposed so as to produce a magnetic flux in said sensing piece;
- and
- a detecting coil disposed so as to detect the magnitude of the magnetic flux passing through said sensing piece.
A device for detecting torque applied to a rotary shaft having a longitudinal axis and a flat surface the device comprising:
- a sensing piece formed substantially in an integral V-shape having two sections that are inclined with respect to the axis of said rotary shaft, the sensing piece including a magnetostrictive material and being attached to said flat surface;
- an exciting coil disposed so as to produce a magnetic flux in the sensing piece;
- and
- a detecting coil disposed so as to detect the magnitude of the magnetic flux passing through the sensing piece.
A device for detecting torque applied to a rotary shaft having a longitudinal axis and a flat surface, the device comprising;
- a sensing piece that includes a magnetostrictive material, the sensing piece being attached to said flat surface wherein said sensing piece is attached to said flat surface of the rotary shaft such that a center portion of the sensing piece is not fixed to the flat surface;
- an exciting coil disposed so as to produce a magnetic flux in the sensing piece;
- and
- a detecting coil disposed so as to detect the magnitude of the magnetic flux passing through the sensing piece.
A device for detecting torque applied to a rotary shaft comprising:
- a rotary shaft having a longitudinal axis;
- a sensing piece including a magnetostrictive material, the sensing piece taking the preformed rigid plate that is attached to a surface of the shaft without being further formed;
- an exciting coil disposed so as to produce a magnetic flux in said sensing piece;
- and
- a detecting coil disposed so as to detect the magnitude of the magnetic flux passing through said sensing piece.
A device for detecting torque applied to a rotary shaft comprising:
- a rotary shaft having a longitudinal axis;
- a sensing piece including a magnetostrictive material, the sensing piece taking the form of a preformed rigid plate, wherein said rotary shaft includes a groove that is bridged by the sensing piece;
- an exciting coil disposed so as to produce a magnetic flux in the sensing piece;
- and
- a detecting coil disposed so as to detect the magnitude of the magnetic flux passing through the sensing piece.
A torque transmitting shaft adapted for use with a torque sensing device, the torque transmitting shaft including:
- a sensing section having at least one substantially flat surface;
- and
- a sensing piece attached to the flat surface, the sensing piece being formed at least partially from a magnetostrictive material and being arranged such that a center portion of the sensing piece is not fixed to the flat surface of rotary shaft.
A device for detecting torque applied to a rotary shaft comprising:
- a sensing section defined in said rotary shaft and having four flat surfaces, each of said flat surfaces having formed therein at least one groove;
- at least one sensing piece attached to said flat surface extending over said groove and inclined with respect to the axis of said rotary shaft;
- and
- a stationary element provided in a non-contact manner with respect to said rotary shaft, said stationary element including an exciting coil and a detecting coil that are disposed in peripheral region of said rotary shaft so as to face said sensing piece.
Dependencies are inferred from the claim text.