TORQUE SENSOR AND MANUFACTURING METHOD THEREOF

• Main Authors: ISHIKAWA TAKUYA, IWAKI TAKAO, OGINO KAZUMASA, YOSHIDA SHUNTARO, TOYODA INEO, OKADA AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2015
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACHINE TOOLS; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PHYSICS; SOLDERING OR UNSOLDERING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a torque sensor configured to reliably transmit distortion of a metal shaft to be measured to a distortion detection element using SAW.SOLUTION: A distortion detection element 40 using SAW is fixed to one surface 21 of a metal frame 20 with glass 30. The metal frame 20 is arranged on a flat surface 12 formed on a surface 11 of a metal shaft 10, and bonded and fixed to the metal shaft 10 by laser welding around an outer edge part 24 of the other surface 22 of the metal frame 20. The distortion detection element 40 is fixed to the metal frame 20 with the glass 30 without being bonded directly to the metal shaft 10, thereby preventing the glass 30 or the distortion detection element 40 from being broken due to a difference in thermal expansion coefficient between the glass 30 or the distortion detection element 40 and the metal shaft 10. The distortion of the metal shaft 10 can be reliably transmitted to the distortion detection element 40 via the metal frame 20 and the glass 30. 【課題】測定対象である金属軸の歪をＳＡＷ方式の歪検出素子に確実に伝えることができる構造を備えたトルクセンサを提供する。【解決手段】金属フレーム２０の一面２１にＳＡＷ方式の歪検出素子４０がガラス３０によって固定されている。金属フレーム２０は、金属軸１０の表面１１に形成された平坦面１２に配置されると共に、当該金属フレーム２０の他面２２の外縁部２４が一周するようにレーザ溶接により金属軸１０に接合固定されている。このように、歪検出素子４０は金属軸１０に直接接合されずに金属フレーム２０にガラス３０で固定されているので、ガラス３０や歪検出素子４０と金属軸１０との熱膨張係数の差によってガラス３０や歪検出素子４０が割れないようにすることができる。したがって、金属軸１０の歪を金属フレーム２０及びガラス３０を介して歪検出素子４０に確実に伝えることができる。【選択図】図１