How does the torquemeter generate torque readings?

How does the torquemeter generate torque readings?

• A. A direct mechanical linkage from the crankshaft
• B. An electrical current from a torque sensor
• C. A magnetic field sensor
• D. An oil pressure signal generated by a torque valve controlled by a helical gear and piston

Answer: (D)

The main idea is that torque is converted into a hydraulic signal. In this torquemeter, a torque valve driven by a helical gear is connected to the drive train. As torque increases, the helical gear moves the valve’s piston, which changes the oil pressure in a sealed chamber. That oil pressure is proportional to the amount of torque being transmitted, and it is fed to the instrument to display the torque reading. This hydraulic method provides a smooth, real-time signal and keeps the measurement isolated from shaft rotation and vibrations. Direct mechanical linkages would be bulky and wear-prone, and wouldn’t provide a clean, isolated signal. An electrical current or a magnetic field sensor would require different sensor technologies and still wouldn’t map torque to a calibrated hydraulic pressure for the indicator in the same straightforward way. The hydraulic torque valve with a helical gear and piston is the established setup for producing the torque signal.

The main idea is that torque is converted into a hydraulic signal. In this torquemeter, a torque valve driven by a helical gear is connected to the drive train. As torque increases, the helical gear moves the valve’s piston, which changes the oil pressure in a sealed chamber. That oil pressure is proportional to the amount of torque being transmitted, and it is fed to the instrument to display the torque reading. This hydraulic method provides a smooth, real-time signal and keeps the measurement isolated from shaft rotation and vibrations.

Direct mechanical linkages would be bulky and wear-prone, and wouldn’t provide a clean, isolated signal. An electrical current or a magnetic field sensor would require different sensor technologies and still wouldn’t map torque to a calibrated hydraulic pressure for the indicator in the same straightforward way. The hydraulic torque valve with a helical gear and piston is the established setup for producing the torque signal.