MAGNETO-RESTRICTION-TYPE TORQUE SENSOR

WIPO Patent Application WO/2012/023386

A1

Provided is a magneto-restriction-type torque sensor which suppresses the slippage along a central axis of a coil wound around a coil bobbin, and a rotation shaft, and controls changes in the magnetic properties of a yoke, and thus can improve torque detection accuracy. The magneto-restriction-type torque sensor is provided with: a rotation shaft (1) which is rotatably mounted to the inside of a cylindrical structure (2) and which has a magneto-restriction effect section (10), the magnetic permeability of which alters according to the torque applied; a cylindrical-shaped coil bobbin (3) which is arranged so as to be concentric with the rotation shaft (1) and so as to be estranged from the magneto-restriction effect section (10) in the radial direction; a coil (4) which is wound around the outer periphery of the coil bobbin (3) and which is for detecting magnetic permeability; and a yoke (5) which is attached to the outer periphery of the coil bobbin (3) whereon the coil (4) is wound. Therein, a positioning protrusion (30) is formed on the coil bobbin (3), said protrusion touching the structure (2) and retaining the position of the coil bobbin (3) within the structure (2); and the yoke (5) and the structure (2) are provided in a non-contact manner.

MIZUNO MITSUMASA (JP)
YAMADA YUTAKA (JP)
ABE HIDEAKI (JP)

PCT/JP2011/066909

February 23, 2012

July 26, 2011

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PANASONIC ELECTRIC WORKS POWER (JP)
MIZUNO MITSUMASA (JP)
YAMADA YUTAKA (JP)
ABE HIDEAKI (JP)

G01L3/10

JP2003028736A	2003-01-29
JPH09196778A	1997-07-31
JPH09105686A	1997-04-22

NISHIKAWA, Yoshikiyo et al. (JP)
Yoshikiyo Nishikawa (JP)

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