A torque sensor includes a first structure, a second structure, a third structure provided between the first structure and the second structure, and at least two sensor units provided between the first structure and the second structure. A plurality of first contact portions having a structure integrated with the first structure is provided inside an outer peripheral portion of the first structure, first distal ends are arranged near the outer peripheral portion, and the first distal ends are in contact with a first attachment portion. A plurality of second contact portions having a structure integrated with the second structure is provided at a part of an inner peripheral portion of the second structure, second distal ends are arranged near the inner peripheral portion, and the second distal ends are in contact with a second attachment portion.

A torque sensor which can improve detection accuracy is provided. The torque sensor includes a first structure, a second structure, a third structure provided between the first structure and the second structure and at least two sensor portions provided between the first structure and the second structure, and a stiffness of one of the first structure and the second structure, closer to the sensor portions is higher than that of the other one.

A self-monitoring flexible drive system including a drive motor having an output member coupled to a flexible drive means configured to move one or more work pieces by loading the flexible drive means in tension. The drive motor is supported by a mount that fixes a position of the drive motor while allowing free rotation. A torque sensor measures torque applied to the flexible drive means by the drive motor. The torque sensor is provided by a torque arm fixedly secured with respect to a housing of the drive motor, and a load measuring support arm supporting a distal portion of the torque arm against a stationary support. A controller receives a variable non-binary output signal from the torque sensor that indicates a value of the measured torque. The controller is programmed to output a signal configured to modify an input drive signal controlling the output of the drive motor.

In a Force/Torque sensor employing strain gages, a hardware temperature compensation procedure substantially eliminates thermal drift of a plurality of load-sensing strain gages with changes in temperature, using trimming resistors and a single, unstressed strain gage. The strain gages are connected in a quarter-bridge configuration, in multiple parallel stages. An unstressed strain gage in quarter-bridge configuration is connected in parallel. Trimming resistors are added across one or more of the unstressed and load-sensing strain gages in a compensation procedure that substantially eliminates thermal drift of the load-sensing strain gages over a predefined temperature range.

A torque measuring device includes a bridge circuit in which four detection coils arranged around a magnetostrictive effect section of a rotating shaft are arranged on four sides; and the bridge circuit includes a resistance element connected to at least one of the four sides for adjusting a resistance value of the side.

The manufacturing method includes: performing testing of samples having the same configuration as the torque measuring device to be manufactured to find a coil balance C.sub.b that is a ratio (R1×R3)/(R2×R4) of a product R1×R3 of resistance values R1 and R3 of one pair of opposite sides of the four sides of a bridge circuit 8, and a product R2×R4 of resistance values R2 and R4 of another pair of opposite sides of the four sides, and a temperature change rate V.sub.T of output voltage Vo of a sensor portion 4, and acquiring a relationship X between the coil balance C.sub.b and the temperature change rate V.sub.T from the test results; and measuring the resistance values R1, R2, R3, R4 of the four sides to find the coil balance C.sub.b to find the temperature change rate V.sub.T from the relationship X for the torque measuring device to be manufactured.

A constant-velocity joint assembly for a power tool includes an output shaft and a coupling structure configured to drive the output shaft. The output shaft and the coupling structure form a joint configured to enable angling of the output shaft relative to the coupling structure at constant rotational speed, and the coupling structure is provided with a torque transducer configured to detect a torque acting on the coupling structure provided by the output shaft.

A spindle shaft device including a shaft, a first torque sensor, and a second torque sensor. The shaft extends along an axial direction and comprises a first side portion, a second side portion, and a central portion located between the first side portion and the second side portion. The central portion has a central torsional rigidity with respect to the axial direction. The first side portion has a first torsional rigidity with respect to the axial direction. The second side portion has a second torsional rigidity with respect to the axial direction. The first torsional rigidity is smaller than the central torsional rigidity. The second torsional rigidity is smaller than the central torsional rigidity. The first torque sensor is disposed on the first side portion. The second torque sensor is disposed on the second side portion.

A dynamic torque sensing device of a thread-on freewheel structure includes a thread-on freewheel sensing body (1), a stationary housing (2) and a sensor (12). The thread-on freewheel sensing body and the stationary housing are rotatable relative to each other, and the sensor is configured to sense a torque of the thread-on freewheel sensing body. The thread-on freewheel sensing body includes a thread-on freewheel sensing body relatively stationary portion (101), a thread-on freewheel sensing body relatively rotating portion (102) and a thread-on freewheel sensing body intermediary portion (103). The thread-on freewheel sensing body relatively stationary portion, the thread-on freewheel sensing body intermediary portion and the thread-on freewheel sensing body relatively rotating portion are sequentially arranged along an axial direction of the thread-on freewheel sensing body. The thread-on freewheel sensing body intermediary portion is configured to connect the thread-on freewheel sensing body relatively stationary portion to the thread-on freewheel sensing body relatively rotating portion.

The present disclosure discloses an anti-overload torque sensor based on thin film sputtering, which includes an output cable, a circuit board, a cushion column, a shell, an elastic body, strain beams and thin film strain gauges. The elastic body is an annular plate, which is sequentially divided into an inner edge section, a mounting ring section and an outer edge section from inside to outside, and the mounting ring section is provided with integrally formed rectangular protrusions as the strain beams. The shell is coaxially installed on the mounting ring section of the elastic body. The circuit board is located in an annular cavity of the shell and is installed on the mounting ring section of the elastic body through the cushion column. One end of the output cable is welded on the circuit board, and the other end is connected with an external electrical connector. Strain resistors of the two thin film strain gauges are sputtered on the strain beams of the elastic body by the sputtering coating technology. A sensitive film is prepared by a sputtering coating process and an anti-torsion limiting structure is provided, when the torque load exceeds a set threshold value, the anti-torsion limiting structure can play the anti-overload role to protect the elastic beams.