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公开(公告)号：US4972727A
公开(公告)日：1990-11-27
申请号：US439344
申请日：1989-11-20
IPC分类号： G01L3/10
摘要： A device for measuring torque in a shaft without contacting the latter. A torque transmitting shaft is formed with at least one detecting magnetically anisotropic region inclined to form an angle with respect to the axis of rotation of this shaft. A detecting coil is disposed on the periphery of the detecting magnetically anisotropic region. When the detecting voltage for the detecting coil changes owing to temperature changes and time-dependent changes, the changes in the detection sensitivity and in the zero point take place, leading to errors during torque measurement. Correct measured values can be obtained by having a device for correcting such changes in sensitivity and zero point.
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公开(公告)号：US5205145A
公开(公告)日：1993-04-27
申请号：US876520
申请日：1992-04-30
申请人： Renshiro Ishino , Yoshio Shibata
发明人： Renshiro Ishino , Yoshio Shibata
CPC分类号： G01L3/102 , G01L3/103 , H01L41/125 , Y10T29/479
摘要： The invention relates to a method of producing magnetostriction type torque sensor shafts adapted to detect a change in permeability when a torque is applied. A plurality of shot peening operations are applied to the surface of a torque sensor shaft in such a manner that the diameter of shot particles to be used is decreased each time. This arrangement ensures that the region in which the residual stress is at a maximum and approximately constant lies over a wide range as seen in the direction of the depth from the outermost surface of the shaft and extends from a deep area to an area close to the surface of the shaft. As a result, the hysteresis and nonlinearity of the shaft are improved and it becomes possible to use a wide range of excitation frequencies.
摘要翻译： 本发明涉及一种制造磁致伸缩式转矩传感器轴的方法，该轴适用于在施加转矩时检测磁导率的变化。 多个喷丸硬化操作以每次使用的喷射粒子的直径减小的方式施加到转矩传感器轴的表面。 这种布置确保了残留应力处于最大值并且近似恒定的区域在从轴的最外表面的深度方向看到的宽范围内，并且从深部区域延伸到靠近 轴的表面。 结果，提高了轴的滞后和非线性，并且可以使用宽范围的激励频率。
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公开(公告)号：US4972726A
公开(公告)日：1990-11-27
申请号：US439343
申请日：1989-11-20
IPC分类号： G01L3/10
摘要： A device for measuring torque in a shaft without contacting the latter. A torque transmitting shaft is formed with at least one detecting magnetically anisotropic region inclined to form an angle with respect to the axis of rotation of this shaft. A detecting coil is disposed on the periphery of the detecting magnetically anisotropic region. When the detecting voltage for the detecting coil changes owing to temperature changes and time-dependent changes, the changes in the detection sensitivity and in the zero point take place, leading to errors during torque measurement. Correct measured values can be obtained by having a device for correcting such changes in sensitivity and zero point.
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公开(公告)号：US5491369A
公开(公告)日：1996-02-13
申请号：US211885
申请日：1994-04-19
申请人： Renshiro Ishino , Taro Saito , Matsumi Sunahata
发明人： Renshiro Ishino , Taro Saito , Matsumi Sunahata
摘要： Method for producing a magnetostrictive torque sensor shaft and a torque sensor shaft made according to the method. Knurl grooves are formed on the surface of shaft base material in oblique relation to the axis thereof, which are then subjected to heat treatment. Subsequently, material having less crystallomagnetic anisotropy and a large magnetostriction constant is deposited by plating, thermal spraying or otherwise at least on the surface of the knurl grooves included in the outer periphery of the shaft base material thereby to form a magnetostrictive layer. Preferably, the magnetostrictive layer is comprised of an FeNi alloy plated layer whose Fe component content is more than 0% but less than 25%. Thus, a sensor shaft is obtained which can be suitably used in constructing a magnetostrictive torque sensor having high performance characteristics. In order to improve the bond between the shaft base material and the magnetostrictive layer, it is preferable to subject the surface of the shaft base material to surface treatment such as shot peening and/or nickel strike plating, prior to the step of magnetostrictive layer forming. This surface treatment makes it possible to obtain a torque sensor having good service durability.
摘要翻译： PCT No.PCT / JP93 / 01175 Sec。 371日期1994年04月19日 102（e）1994年4月19日PCT PCT 1993年8月23日PCT公布。 出版物WO94 / 04896 日期：1994年3月3日。根据该方法制造的磁致伸缩扭矩传感器轴和转矩传感器轴的制造方法。 在轴基材的与轴的倾斜关系的表面上形成有旋转槽，然后进行热处理。 随后，通过电镀，热喷涂或至少在包括在轴基材的外周中的滚花槽的表面上沉积具有较小结晶磁各向异性和大的磁致伸缩常数的材料，从而形成磁致伸缩层。 优选地，磁致伸缩层由Fe组分含量大于0％但小于25％的FeNi合金镀层组成。 因此，获得了可以适用于构造具有高性能特性的磁致伸缩扭矩传感器的传感器轴。 为了改善轴基材料和磁致伸缩层之间的结合，优选在磁致伸缩层形成步骤之前，将轴基材的表面进行表面处理如喷丸硬化和/或镍触镀， 。 该表面处理使得可以获得具有良好使用寿命的扭矩传感器。
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5.发明授权
公开(公告)号：US4920809A
公开(公告)日：1990-05-01
申请号：US260990
申请日：1988-10-21
IPC分类号： G01L3/10
摘要： A device for measuring torque in a shaft without contacting the latter. A torque transmitting shaft is formed with at least one detecting magnetically anisotropic region inclined to form an angle with respect to the axis of rotation of this shaft. A detecting coil is disposed on the periphery of the detecting magnetically anisotropic region. When the detecting voltage for the detecting coil changes owing to temperature changes and time-dependent changes, the changes in the detection sensitivity and in the zero point take place, leading to errors during torque measurement. Correct measured values can be obtained by having a device for correcting such changes in sensitivity and zero point.
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公开(公告)号：US5186059A
公开(公告)日：1993-02-16
申请号：US640685
申请日：1991-01-14
IPC分类号： G01L3/10
摘要： A torque sensor shaft for a non-contacting torque sensor including magnetically anisotropic portions formed on the surface of the shaft. Absolute value of angle of inclination of the anisotropic directions of the magnetically anisotropic portions is set lower than 40 degree so as to permit reduction of stress components in the anisotropic directions from their level in the case where the absolute value of the angle is 45 degree. By such angle setting it is possible to prevent possible decrease in sensor sensitivity and, in addition, to obtain good improvement in the point of magnetic saturation due to torque applied, thereby to obtain an improved dynamic range.
摘要翻译： 一种用于非接触转矩传感器的转矩传感器轴，包括形成在轴的表面上的磁各向异性部分。 磁各向异性部分的各向异性方向的倾斜角的绝对值设定为低于40度，从而允许在角度的绝对值为45度的情况下从各向异性方向的应力分量减小。 通过这样的角度设定，可以防止传感器灵敏度的可能降低，并且另外由于施加扭矩而获得对磁饱和点的良好改善，从而获得改善的动态范围。
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公开(公告)号：US4972728A
公开(公告)日：1990-11-27
申请号：US439347
申请日：1989-11-20
IPC分类号： G01L3/10
摘要： A device for measuring torque in a shaft without contacting the latter. A torque transmitting shaft is formed with at least one detecting magnetically anisotropic region inclined to form an angle with respect to the axis of rotation of this shaft. A detecting coil is disposed on the periphery of the detecting magnetically anisotropic region. When the detecting voltage for the detecting coil changes owing to temperature changes and time-dependent changes, the changes in the detection sensitivity and in the zero point take place, leading to errors during torque measurement. Correct measured values can be obtained by having a device for correcting such changes in sensitivity and zero point.
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公开(公告)号：US4933580A
公开(公告)日：1990-06-12
申请号：US361947
申请日：1989-06-05
CPC分类号： H01L41/125 , G01L3/102 , G01L3/103 , G01L3/105 , Y10S73/02
摘要： A magneto-strictive torque sensor for electrically contactlessly detecting a torque applied to a rotary shaft on the basis of a resulting change in the magnetic permeability of the surface of the shaft. Fine dents and retainer areas for retaining residual compressive stress due to the fine dents are formed on the surface of the rotary shaft. According to this arrangement, the process of magnetization resulting from the application of an exciting magnetic field and of the torque to the rotary shaft involves less magnetization due to magnetic domain wall displacement and consists principally of reversible magnetic rotation, with the result of reduced hysteresis in the magnetization process. The reduced hysteresis causes less hysteresis involved in torque detection and higher detection sensitivity, thus resulting in high accuracy of torque detection. Further, by working the surface of the rotary shaft for the purpose of forming the fine dents thereon, microdefects present on the surface layer of the rotary shaft are reduced or eliminated and thus reduced hysteresis and improved sensitivity can be attained in the process of torque detection.
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