TW12.8HRMS175 wheel torque transducer
High-resolution wheel torque transducer for cars and light-duty trucks, 237 N·m (175 lbf·ft) full scale, resolving 0.14 N·m, with a mechanical stop at 8.1 kN·m.
- 237 N·m
- Torque capacity
- 0.14 N·m
- Resolution
- 14 in and larger
- Rim size
- ≤ 0.1 % FS
- Non-linearity
- Sensor4-arm strain gage bridge
- Hysteresis≤ 0.05 % FS
- Signal transmissionslip ring or telemetry
TW12.8HRMS175: high-resolution wheel torque transducer, 237 N·m
The TW12.8HRMS175 is a high-resolution wheel torque transducer that gives one channel of torque data. Its four-arm strain gage bridge measures up to 237 N·m (175 lbf·ft) and resolves 0.1 lbf·ft (0.14 N·m); a mechanical stop protects it to 8.1 kN·m (6,000 lbf·ft) for use in normal driving. It carries a static weight of 1,000 kg. The stainless steel ring, Ø 340.18 × 25.65 mm, is sealed to IP67 and adapts to 14 in and larger wheels. Non-linearity is 0.1 % of full scale or less and hysteresis 0.05 %, at up to 10 V excitation, DC or AC rms; it operates from −40 to 125 °C.
It uses the adapters of the other TW12.8 models: the hub adapter bolts to the inner circle of eighteen holes, the rim adapter to the outer circle of twelve. The weatherproof slip ring, encoder and amplifier assembly offered for all wheel torque transducers mounts on lug-nut extensions with minimal radial run-out; a restraint rod to a magnetic bracket on the fender holds its stator. With no torque on the wheels, the zero offset is noted, then positive and negative shunts relate the output to the calibrated torque.
High-resolution wheel torque transducers measure aerodynamic drag, brake drag, tire rolling resistance and bearing seal drag during on-road testing; the TW12.8HRMS175 is used to test cars and SUVs.
Specifications
| Torque capacity | 237 N·m |
|---|---|
| Mechanical stop | 8 100 N·m |
| Max static load | 1 000 kg |
| Non-linearity | ≤ 0.1 % FS |
| Hysteresis | ≤ 0.05 % FS |
| Torque resolution | 0.14 N·m |
| High resolution | Yes |
| Sensing principle | Strain gage (4-arm bridge) |
| Excitation voltage | 10 V (maximum, DC or AC rms) |
| Shaft diameter | 198.02 mm (center bore) |
| Mounting fasteners | 18 × Ø 9.91 mm |
| Rim fasteners | 12 × Ø 9.91 mm |
| Bolt circle | 213.26 mm |
| Rim bolt circle | 324.97 mm |
| Dimensions | Ø 340.18 × 25.65 mm |
| Operating temperature | −40 to 125 °C |
| Protection | IP67 |
| Vehicles | Passenger cars · Light trucks |
| Rim size | 14 in (and larger) |
Resources
Datasheets and manuals
Drawings
CAD models
None for TW12.8HRMS175.
Guides and notes
Related applications
-
Efficiency Vehicle efficiency and power mapping Torque and speed measured at each driveline stage, from engine to wheel, so each power loss has a location. -
Efficiency Brake drag and rolling resistance Low drag torques at the wheel, read on the road with a resolution of 0.14 N·m on cars and SUVs. -
Durability Wheel loads on the road Three forces and three moments at each wheel, recorded while the vehicle is driven.
If the TW12.8HRMS175 is not the one
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Battery-powered clamp-on telemetry transmitter for one full strain gage bridge, in an IP67 housing that straps to shafts of 25 mm or more, with a 2.4 GHz digital link.
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