A drive bearing includes an element rotatably mounted and which comprises magnetized magnetostrictive material. A torque can be applied to the element and the magnetostrictive magnetized material is formed to generate at a first position outside the element a magnetic field as a function of the torque applied. A measuring circuit comprises a first magnetic field sensor for detecting a total magnetic field at the first position, the total magnetic field comprising the magnetic field generated by the magnetostrictive magnetized material and an external magnetic field. The first magnetic field sensor outputs a first signal as a function of the total magnetic field detected. A second magnetic field sensor detects the external magnetic field at a second position and outputs a second signal as a function of the external magnetic field detected. The measuring circuit determines a value of the torque applied using the first and the second signals.

A force sensor device includes a strain generator including a first fixed part secured to a portion transmitting rotational driving force or a portion to which the rotational driving force is transmitted, a second fixed part secured to the portion to which the driving force is transmitted or the portion transmitting the driving force, and a joining part that joins the first fixed part to the second fixed part; a strain detecting sensor that detects deformation in the joining part; and a support member provided with a base secured to the second fixed part, wherein the support member includes a regulator and a protrusion, and wherein, in a support part of the first fixed part, a groove is formed by cutting the support part from an inner surface in a radial direction toward an outer surface, and the protrusion of the support member is inserted into the groove.

A torque measurement device includes a case that does not rotate even during use; a rotating shaft rotatably supported to the case and having a magnetostrictive effect part whose magnetic permeability changes according to a transmitted torque; and a magnetostrictive sensor having a detection part arranged closely adjacent to the magnetostrictive effect part so that a voltage changes according to change of the magnetic permeability of the magnetostrictive effect part, and being supported to the case; and the torque measurement device has a rotation-preventing construction configured to prevent the magnetostrictive sensor from rotating with respect to the case.

A torque measurement device includes a case that does not rotate even during use; a rotating shaft rotatably supported to the case and having a magnetostrictive effect part whose magnetic permeability changes according to a transmitted torque; and a magnetostrictive sensor having a detection part arranged closely adjacent to the magnetostrictive effect part so that a voltage changes according to change of the magnetic permeability of the magnetostrictive effect part, and being supported to the case; and the torque measurement device has a rotation-preventing construction configured to prevent the magnetostrictive sensor from rotating with respect to the case.

In a torque sensor (1), a sleeve (21) is an annular member mounted on a first rotating member. An intermediate member (26) is an annular member placed on an outer circumferential face of the sleeve (21). A magnet (25) is an annular member placed on an outer circumferential face of the intermediate member (26). A yoke (35) is mounted on a second rotating member and faces the magnet (25) in a radial direction. A rotating member connecting part (211) of the sleeve (21) is cylindrical and is in contact with the first rotating member. An intermediate member connecting part (215) is at a position shifted with respect to the rotating member connecting part (211) in an axial direction parallel to a central axis Z. An outer diameter (E219) of a sleeve end (219), which is an end of the intermediate member connecting part (215) opposite from the rotating member connecting part (211), is smaller than a minimum inner diameter (I25) of the magnet (25).

In a torque sensor (1), a sleeve (21) is an annular member mounted on a first rotating member. An intermediate member (26) is an annular member placed on an outer circumferential face of the sleeve (21). A magnet (25) is an annular member placed on an outer circumferential face of the intermediate member (26). A yoke (35) is mounted on a second rotating member and faces the magnet (25) in a radial direction. A rotating member connecting part (211) of the sleeve (21) is cylindrical and is in contact with the first rotating member. An intermediate member connecting part (215) is at a position shifted with respect to the rotating member connecting part (211) in an axial direction parallel to a central axis Z. An outer diameter (E219) of a sleeve end (219), which is an end of the intermediate member connecting part (215) opposite from the rotating member connecting part (211), is smaller than a minimum inner diameter (I25) of the magnet (25).

According to an aspect, a system includes a memory system configured to store a plurality of instructions and a processing system. The processing system is configured to communicate with the memory system and execute the instructions that result in determining an initial torque applied to a component stack, determining an assembly torque and an angle of turn applied to the component stack after the initial torque is applied, and determining a friction value associated with the component stack. Execution of the instructions further result in determining a stack load of the component stack based on the friction value, the assembly torque, and the angle of turn, and outputting an indicator of the stack load.

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.

A torque measurement system includes an outer rotational shaft and an inner rotational shaft both configured to rotate about a rotational axis. A rotation of the inner rotational shaft causes a rotation of the outer rotational shaft via a coupling structure. At least one torque applied to the inner rotational shaft is translated into a first torque-dependent angular shift between the shafts. A first metamaterial track is coupled to the outer rotational shaft and configured to co-rotate with the outer rotational shaft. A second metamaterial track is coupled to the inner rotational shaft and configured to co-rotate with the inner rotational shaft. The tracks are configured to convert an electro-magnetic transmit signal into a first electro-magnetic receive signal based on the first torque-dependent angular shift and a receiver is configured to receive the electro-magnetic receive signal and measure the at least one torque based on the electro-magnetic receive signal.

A torque measurement system includes an outer rotational shaft and an inner rotational shaft both configured to rotate about a rotational axis. A rotation of the inner rotational shaft causes a rotation of the outer rotational shaft via a coupling structure. At least one torque applied to the inner rotational shaft is translated into a first torque-dependent angular shift between the shafts. A first metamaterial track is coupled to the outer rotational shaft and configured to co-rotate with the outer rotational shaft. A second metamaterial track is coupled to the inner rotational shaft and configured to co-rotate with the inner rotational shaft. The tracks are configured to convert an electro-magnetic transmit signal into a first electro-magnetic receive signal based on the first torque-dependent angular shift and a receiver is configured to receive the electro-magnetic receive signal and measure the at least one torque based on the electro-magnetic receive signal.