LW25 wheel force transducer
Six-axis wheel force transducer for motorcycles, ATVs and small cars, 25 kN radial and 8.9 kN lateral, sealed to IP67, with a swappable slip ring or telemetry package.
- 25 kN
- Fx, Fz capacity
- 8.9 kN
- Fy capacity
- 2.0 / 3.4 kN·m
- Moment capacity
- ≤ 0.25 % FS (forces, My)
- Non-linearity
- OutputsFx Fy Fz · Mx My Mz
- Also measuredX and Z acceleration (X, Y, Z on the LW50 and LW55) · wheel speed and angle
- Signal outputanalog · CAN · Ethernet · CAN FD and EtherCAT on the CT3
LW25: wheel force transducer for motorcycles and small cars, 25 kN
The LW25 measures all the wheel forces and moments on motorcycles, ATVs and small cars, with X and Z accelerations. It is rated 25 kN (5,600 lbf) on Fx and Fz, 8.9 kN (2,000 lbf) on Fy, 2.0 kN·m on Mx and Mz and 3.4 kN·m on My, for a static weight of 550 kg. Non-linearity is 0.25 % of full scale or less on the forces and My, crosstalk after correction 0.4 % or less. The IP67 transducer weighs 1.5 kg, operates from −40 to 125 °C and fits 11 in and larger wheels, or 8 in with a two-piece rim adapter.
The hub and rim adapters each bolt to the transducer with sixteen M8 × 1.25 screws, tightened in a star pattern to 40 N·m; a motorcycle hub adapter suits a double-sided swing arm. The signals leave the wheel through an outboard slip ring, at 0.17° angular resolution, or a factory-mated telemetry and encoder ring, at 0.25°, whose stator is set with an alignment tool on an adjustable bracket. The CT3 box, powered at 9 to 36 V DC, zeroes the transducer, checks the shunt calibration and transforms the coordinates.
Its IP67 design suits the harshest track and off-road measurements; on a motorcycle, the telemetry package mounts outboard. Non-spinning, the transducer monitors and controls laboratory test rigs.
Specifications
| Measured quantities | Fx · Fy · Fz · Mx · My · Mz |
|---|---|
| Force capacity | Fx 25 · Fy 8.9 · Fz 25 kN |
| Moment capacity | Mx 2 000 · My 3 400 · Mz 2 000 N·m |
| Max static load | 550 kg |
| Non-linearity | Fx ≤ 0.25 · Fy ≤ 0.25 · Fz ≤ 0.25 · Mx ≤ 0.5 · My ≤ 0.25 · Mz ≤ 0.5 % FS |
| Hysteresis | ≤ 0.25 % FS |
| Crosstalk | ≤ 0.4 % FS (after correction) |
| Angle resolution | 0.17° (slip ring; 0.25° with telemetry) |
| Axes | 6 |
| Accelerometer range | 100 g (X and Z) |
| Output | CAN FD · CAN · Ethernet · EtherCAT · Analog voltage (CAN 2.0; EtherCAT and analog with optional modules) |
| Signal transmission | Slip ring · Telemetry (slip ring outboard; telemetry inboard or outboard (motorcycles)) |
| Shaft diameter | 167.64 mm (center bore) |
| Mounting fasteners | 16 × M8 × 1.25 |
| Rim fasteners | 16 × M8 × 1.25 |
| Bolt circle | 190.5 mm |
| Rim bolt circle | 259.72 mm |
| Dimensions | Ø 273.69 × 22.86 mm |
| Weight | 1.5 kg |
| Operating temperature | −40 to 125 °C |
| Protection | IP67 |
| Interface box | CT3 |
| Vehicles | Motorcycles · ATVs · Small cars |
| Rim size | 11 in (and larger; 8 in and larger with a two-piece rim adapter) |
Request a quote
Unusual bolt pattern, motorsport hub, agricultural wheel: we build it around your wheel.
Used with the LW series
What you add here goes into the same quote request.
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Measure on a steered wheel
SAC stator angle corrector
Corrects the rotation angle signal in real time for the coordinate transformation, with no over-the-wheel bracket. Internal encoder accuracy ≤ 0.25°, IP67.
Slip ring versions, with the CT3 interface box.
Resources
Datasheets and manuals
Drawings
CAD models
Guides and notes
Related applications
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Durability Wheel loads on the road Three forces and three moments at each wheel, recorded while the vehicle is driven. -
Dynamics Vehicle dynamics The forces and moments at each wheel while the vehicle brakes, turns and changes lane. -
Dynamics Side slip angle Side slip angle read without contact by an optical sensor, on a wheel or on the vehicle body. -
Test rig Road simulators The loads measured at the wheel on the road, and the proof that the simulator reproduces them.
If a six-axis wheel is not what you need
- Torque only TW series wheel torque transducers
Drive and brake torque My at the wheel, 237 N·m to 81 kN·m.
- Signals from the series wheel Wheel instrumentation system
Strain gages, thermocouples and wheel speed, on the wheel the vehicle already has.
- Force on a part, not a wheel TR3D-B three-axis load cells
Three orthogonal forces from 1.1 to 71 kN per axis.
A question on this product?
Vehicle, wheel size, expected loads. An application engineer answers.
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