6-component Wheel Force Transducer
The CAEMAX 6-component Wheel Force Transducer WFT-Cx can be used on small cars with a rim diameter from 13 inches up to SUVs and small trucks with a hub diameter of up to 5.5 inches. In addition to its waterproof construction, it features shock resistance up to 100 g, thus allowing for the first time testing over “speed bumps”. The cooling-optimized design combined with excellent heat conduction from the aluminum WFT sensor housing avoids excessive heat input, even in the case of full braking. For example, over 20 braking tests (acceleration to 150 km/h followed by full braking) were carried out with the WFT: the temperature of the WFT sensor housing did not exceed the 50° C limit. The entire signal processing is designed for temperature between -40° C to + 105° C. All of this results in a much broader application spectrum, which now also includes braking, comfort and tire testing with using the same WFT configuration.
The proven 6-component WFT-Cx from CAEMAX Technologie GmbH is now also available for small cars with rims from 13 inches in size. Especially in small cars, where the weight often plays a crucial role, this task can now be met by the considerably lighter WFT-Cxs variant – and with almost the same strength. It simplifies the testing and measuring of load profiles, driving dynamics or braking in all applications where weight plays a decisive role.
The WFT-Cx at a glance :
Acquires forces and torques in the X-, Y-, Z-directions on the rotating wheel
Data output referred to vehicle coordinate system with online display
Maximum immunity to interference and measurement accuracy through on-site digitization and online processing of raw data
UPS to prevent issues during engine cranking
Precise temperature compensation
Robust WFT sensor housing with long service life
Safety feature: breakage protection through interlocking mechanical structure
Versatile range of applications during winter tests, brake tests and much more
- Hub adapter:
The hub adapter connects the WFT to the vehicle. It can be used for different types of vehicles, as long as the bolt circle and the wheel offset are the same. With just a few hub adapters, an entire vehicle fleet can be covered.
- Rim adapter:
As with a conventional rim, the rim adapter serves as a mount for the tire. The rim adapter is not directly specific to the vehicle, but depends on the tire. This allows it to be used on different vehicles with the same tire size.
- WFT sensor housing:
The WFT sensor housing connects the hub adapter and the rim adapter to each other. These three components together form the vehicle-specific wheel. Since the calibration factors are permanently stored in the sensor, you can recombine adapters and sensor housings at any time without having to calibrate the wheel again. Thus, based on a modular design, a WFT-Cx Wheel Force Transducer can be adapted to the vehicle in a time-saving, space-saving and cost-effective manner.
- Hub adapter:
Material Aluminum Titanium Steel PH17-4 Measurement principle Temperature compensated strain gauge application Measurement ranges: Forces Fx, Fz = ±45 kN Fx, Fz = ±60 kN Fx, Fz = ±60 kN Fy = ±25 kN Fy = ±30 kN Fy = ±30 kN Measurement ranges: Torques Mx, My, Mz ±8,75 kNm ±10 kNm ±10 kNm Protection class IP66, IP67 Sampling rate per channel bis 5 kHz Angular resolution with 5000 increments 0.072° Accuracy <0.2% FS Hysteresis <0.2% FS Crosstalk <0.2% FS Low pass filter 6-pol Butterworth filter (cut-off frequency 1200 Hz) Weight w/o adapter <7.9 kg ca. 10.5 kg ca. 17.5 kg Rim diameter min. 14″ (356 mm), 13″ by request Hub diameter with adapter max. 5.5″ Operating temperature -40° C to +105° C Mechanical load Stress analysis according to BMW QV 36026 Shock proof max. 100 g RPM max. 2300 rpm (ca. 278 km/h) Safety Mechanical breakage protection Dimension: outer diameter (w/o adapter) 317.5 mm Dimension: inner diameter (w/o adapter) 203 mm Dimension: height 76 mm Temperature drift 0.005% / °C Mounting bolts 32 Adaption Customer-specific adaption for any vehicle possible