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US 11,698,312 B2Granted
Torque load member and method for manufacturing same, and torque measuring device
AssigneesNsk Ltd., Proterial, Ltd.
InventorsKota Fukuda, Junji Ono, Shinji Okada, Teruyuki Nakamura, Yuta Sugiyama
Life of this patent
Estimating the term…
Abstract
A torque load member has a detected surface which is configured to face a magnetostrictive torque sensor. The detected surface is a shot peened surface whose magnetic anisotropy directed in a specific direction has been reduced by performing shot peening thereto at an arc height value of 0.31 mmA or more.
Claims4
A torque load member, comprising:
- a detected surface configured to face a magnetostrictive torque sensor, the detected surface having a cylindrical surface shape;
- the detected surface being a shot peened surface whose magnetic anisotropy directed in a specific direction has been reduced by performing shot peening thereto at an arc height value of 0.31 mmA or more,
- the torque load member having hysteresis of 2.0% FS or less, the hysteresis obtained by a characteristics data with respect to a torque measurement when a torque is measured while a torque loaded to the torque load member is changed so as to reciprocate between positive and negative rated torques.
A method for manufacturing a torque load member having a detected surface configured to face a magnetostrictive torque sensor, the detected surface having a cylindrical surface shape;
- the method comprising:
- a step of performing shot peening to the detected surface at an arc height value of 0.31 mmA or more so as to reduce magnetic anisotropy directed in a specific direction of the detected surface,
- after the step of performing shot peening, the torque load member having hysteresis of 2.0% FS or less, the hysteresis obtained by a characteristics data with respect to a torque measurement when a torque is measured while a torque loaded to the torque load member is changed so as to reciprocate between positive and negative rated torques.
Dependencies are inferred from the claim text.