Torque sensor and manufacturing method therefor

摘要

A torque sensor includes: a base portion fixed to a metal shaft having a rod shape as a measurement object of strain; a strain detection element of a surface acoustic wave type which is arranged in the base portion, and detects the strain of the metal shaft (10) through the base portion; and a fixing portion that is arranged between the base portion and the strain detection element, and fixes the strain detection element to the base portion.

主权项

1. A torque sensor comprising:
a metal shaft having a rod shape as a measurement object of strain that is fixed to a base portion; a strain detection element of a surface acoustic wave type which is arranged in the base portion, and detects the strain of the metal shaft through the base portion; a fixing portion that is arranged between the base portion and the strain detection element, and fixes the strain detection element to the base portion; wherein the metal shaft has one end and a hole portion, which is prepared by recessing a part of the one end along a center axis of the metal shaft, wherein the base portion includes:
a metal frame having a plate shape that has one surface and another surface, which is disposed on an opposite side of the one surface, and is arranged in the hole portion in a state where at least a part of the another surface contacts with an inner wall surface of the hole portion which is in parallel to the center axis; anda pushing device that is arranged in the hole for pushing the metal frame along the inner wall surface of the hole portion, and wherein the strain detection element is fixed to the one surface of the metal frame through the fixing portion, and detects the strain of the metal shaft through the metal frame.