Torque detecting apparatus

摘要

A torque detecting apparatus detects a torque applied to a first shaft, based on a relative rotational displacement between the first shaft and a second shaft caused by torsion in a coupling shaft which couples the first shaft and the second shaft. The torque detecting apparatus includes: first and second magnets which are coupled to the first shaft and the second shaft so as to rotate together with the first shaft and second shaft, respectively; and a plurality of magnetic sensors which are disposed between the first magnet and the second magnet and which detect a rotational angle of the first shaft and a rotational angle of the second shaft.

主权项

1. A torque detecting apparatus for detecting a torque applied to a first shaft, based on a relative rotational displacement between the first shaft and a second shaft caused by torsion in a coupling shaft which couples the first shaft and the second shaft, said torque detecting apparatus comprising:
a first magnet which is coupled to the first shaft so as to rotate together with the first shaft; a second magnet which is coupled to the second shaft so as to rotate together with the second shaft; and a plurality of magnetic sensors which are disposed between the first magnet and the second magnet and which detect a rotational angle of the first shaft and a rotational angle of the second shaft, wherein the plurality of magnetic sensors comprise: a plurality of first shaft rotational angle detecting magnetic sensors which detect the rotational angle of the first shaft based on magnetic flux from the first magnet; and a plurality of second shaft rotational angle detecting magnetic sensors which detect the rotational angle of the second shaft based on magnetic flux from the second magnet, wherein a first magnetic blocking member which blocks the magnetic flux directed from the second magnet towards the first shaft rotational angle detecting magnetic sensors is disposed between the first shaft rotational angle detecting magnetic sensors and the second magnet, wherein a second magnetic blocking member which blocks the magnetic flux directed from the first magnet towards the second shaft rotational angle detecting magnetic sensors is disposed between the second shaft rotational angle detecting magnetic sensors and the first magnet, and wherein the first and second magnetic blocking members are mounted on a surface of a sensor mounting base opposite to a surface of the sensor mounting base to which the plurality of magnetic sensors are mounted, each of the first and second magnetic blocking members extending only partially circumferentially around one of the first or second shafts.