Title: Torque sensor
Application Number: 200610100267 Application Date: 2006.07.05
Publication Number: 1896704 Publication Date: 2007.01.17
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01L3/10;B62D5/04;G01L5/22
Applicant(s) Name: Hitachi Cable Address:
Inventor(s) Name: Matsusaki Toshimichi;Ohtaka Tatsuya;Sato Kouichi;I
Attorney & Agent: xiong zhicheng
Abstract:
    The present invention provides a torque sensor capable of reducing the working/assembling cost, and acquiring satisfactory assemblability of the sensor as a whole. A torque sensor is provided with two shafts 3, 4 (input shaft 3 and output shaft 4 ) which constitute a shaft member 2, which is a torque detection object, an elastic member 5 which connects the shafts 3 and 4 coaxially, and a torsion angle of the elastic member 5 is detected as a torque which affects on the shaft member 2. The torque sensor 1 is provided with a hard magnetic member 6 which generates a magnetic flux therearound, a pair of first soft magnetic members 7, 8 which constitute a first magnetic circuit H1 together with the hard magnetic member 6 to change a reluctance by torsion of the elastic member 5, a pair of second soft magnetic members 9,10 which constitute a second magnetic circuit H2 together with the hard magnetic member 6 to keep the reluctance constant, and a flux detection means 12 which detects a flux density of the second magnetic circuit H2 that varies in accordance with a torsion angle of the elastic member 5.
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