Torsion-detecting sleeve member and torque-detecting device using the same

Abstract

A torque-detecting sleeve member 40 is a cylindrical member that has first and second cylindrical torque-acting parts 50a and 50b, a torsion signal generator 52 and a torsion converter 54. Torque acts on the first and second cylindrical torque-acting parts in at least two points. The torsion signal generator is disposed axially between the first and second cylindrical torque-acting parts to at least partially form an external peripheral surface between the first and second cylindrical torque-acting parts. The torsion converter is operatively disposed between the torsion signal generator and at least one of the first and second cylindrical torque-acting parts for converting torsion transmitted from the at least one of the first and second cylindrical torque-acting parts to the torsion signal generator.

Description

technical field [0001] The present invention relates to a cylindrical torsion detection sleeve member and a torsion detection device using the same. Background technique [0002] A torque sensor (an example of a torque detection device) that detects a torque acting on a shaft is conventionally known. Among such torsion sensors, a torsion sensor using a magnetostrictive effect in which magnetic force changes according to strain has been developed (for example, refer to Patent Documents 1 and 2). [0003] The torque sensor disclosed in Patent Document 1 has two solid shafts arranged concentrically, a thin-walled cylindrical shaft connected in series between the two solid shafts, and a detection coil arranged on the outer peripheral side of the thin-walled cylindrical shaft. Compared with the two solid shafts, the thin-walled cylindrical shaft has a very small effective cross-sectional area, and the solid shaft and the thin-walled cylindrical shaft are magnetized in one direct...

AI Technical Summary

Problems solved by technology

[0010] In this way, in the above-mentioned conventional structure, if a large torsion force acts, there is a possibility that a measurement error will occur.

In addition, even if the torque is small, the torque detection range is limited by the thickness and rigidity of the thin-walled cylindrical part and the sleeve, and it is difficult to change the torque detection range.

Images