TW10.8 wheel torque transducer 4 068 N·m

TW10.8: wheel torque transducer, 4,068 N·m

The TW10.8 is a wheel torque transducer for passenger cars in a stainless steel ring of Ø 291.57 mm (11.479 in) by 25.64 mm, with a Ø 149.40 mm center bore. It gives one channel of torque data from a four-arm strain gage bridge, up to 4,068 N·m (3,000 lbf·ft), which is also its combined steer/camber moment rating, from a 525 Ω bridge. It adapts to 12 to 15 in wheels. The output is 1.5 mV/V nominal at up to 10 V excitation, with non-linearity of 0.1 % and hysteresis of 0.05 % of full scale. It is temperature compensated from 24 to 121 °C and usable from −40 to 149 °C, or 177 °C short term. The output connector is a Bendix PTY02E-8-4P.

Both bolt circles carry twelve Ø 9.91 mm holes: the hub adapter fastens to the inner circle, Ø 164.64 mm, and the rim adapter to the outer circle, Ø 276.35 mm. Both adapters are made from a profile of the original rim and duplicate its critical dimensions. A restraint rod to a magnetic bracket on the fender holds the stator of the slip ring, encoder and amplifier assembly, which mounts on lug-nut extensions. With no torque on the wheels, the zero offset is noted, then positive and negative shunts relate the output to the calibrated torque.

The TW10.8 is designed for passenger cars; its data serves braking system, vehicle stability and driveline development. The TW12.8 (Ø 340.18 mm, 14 in and larger wheels) and the TW15.0 (Ø 396.04 mm, 15 in and larger wheels) are the next rings up.