| 摘要 |
PROBLEM TO BE SOLVED: To drastically reduce an amount of use of expensive magnetic material of a magnetic collector ring while securing efficient magnetic collection of a magnetic flux in a yoke by the magnetic collector ring. SOLUTION: A magnet 4 and the yoke 5 permeating a magnetic flux of the magnet 4 are fixed to at least two separate parts of a shaft part subjected to torque detection, respectively. A yoke protrusion 54 is provided on an outer circumference of the yoke 5. The magnetic collector ring 6 is arranged and fixed to an outer diameter side of the yoke protrusion 54. It is set so that a relational expression of Lyoke>Lring+ΔL is satisfied where Lring is the axial direction width of an inner diameter end face 6a of the magnetic collector ring 6, Lyoke is the axial direction width of an outer diameter end face 54a of the yoke protrusion 54, andΔL is the axial direction displacement of the yoke protrusion 54. COPYRIGHT: (C)2009,JPO&INPIT
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