Foot Mount Torque-Meter
OVERVIEW OF MEASUREMENT SYSTEM
Type of Measurement: Fatigue Rated Measurement of Input / Output Torsionals
Typical Test: Engine & Powertrain Fatigue Testing Dynamometer
0.01% ( 1 part in 10,000 )
10,000 to 36,000 in.-lbs.
Maximum RPM : 8,000
Maximum RPM :
-25 ºF to +200
Special Test Conditions:
Possible Bending Moment / Side Load between rotating flange and stationary housing (One end of Torque-Meter Only)
Possible High Magnetic & Electric Fields from Dyno Motors, Eddy Current Brakes or other Electro-Mechanical Hardware
Possible High Extraneous Loads & Torsional Overload from Engine or Powertrain Component Failures
Short Length Unit with Flanges for Maximizing Torsional Stiffness.
Shaft / Flange Interface Features a Tapered P3 Polygon ( 3 cam ground lobes on a 10:1 taper) , Engineered to Resist Fretting Corrosion from Oscillating & Heavy Shock Loading (Dynamically it bears a close Resemblance to a Solid Joint).
One or Both Flanges are able to Bolt Directly to the Flexible Disc Packs of a Rexnord / Thomas Series 52 Coupling .
Bearings on One Housing End are Engineered to take the Extraneous Loading from a Cardan Joint Driveshaft.
Heat Treated Housing with an Integral Foot Mount for Mechanical Rigidity & Reduced Fretting Corrosion at Bearing Interface from Extraneous Loading.
Optional Excitation Carrier Frequencies of 3kHz, 3.28kHz, 5kHz, 10kHz, 20kHz
Thermocouple ports for Monitoring of Bearing Temperatures
Accelerometer Mounting Surfaces for Monitoring Alignment, Balance & Resonance Vibrations
Torque-Meter is designed to be integrated into an Engine & Powertrain Fatigue Testing Dynamometer. Torque-Meter accurately measures input / output torsionals while being resistant to fatigue and having a survivability when engine or powertrain components fail. It's short length with flanges maximizes torsional stiffness.
One end of the torque-meter has a bearing arrangement Engineered for the extraneous bending moment from a Cardan Joint Driveshaft or the side loading from a pulley or other mechanical arrangement. One or both flanges can bolt directly to the flexible disc packs of a Rexnord / Thomas Series 52 Coupling. Shaft / flange interface features a tapered P3 Polygon ( 3 cam ground lobes on a 10:1 taper), Engineered to resist the fretting corrosion from oscillating & heavy shock loading (dynamically it bears a close resemblance to a solid joint ). Torque-meter has an integral foot mount for mechanical rigidity and is heat treated for reduced fretting corrosion at the load bearing surfaces.
Torque-Meter uses passive strain gage technology on a rotating shaft. Mechanical stress is converted to strain which is transduced into a voltage signal via strain gages in a full wheatstone bridge arrangement. Communication between stationary and rotating worlds is performed via a rotary transformer. The rotary transformer requires an AC Excitation Voltage and transmits back an Amplitude Modulated Signal Voltage (mV) @ the Excitation Frequency, which is a measurement of the applied Torque.
Transformer Operating Frequencies of 3kHz,
3.28kHz, 5kHz, 10kHz or 20kHz.
Bearing Thermocouple Probe Ass'y; Type J ,
Type K or Type T
Warning Sensors for Monitoring Alignment,
Mass-Unbalance & Resonance Vibrations
High Output or High Overload / Torsional
Tuning of Center Member
- Overload Capability : 400 % Typical (note:
Overload may be reduced by Flange Capability)
- Nominal Output @ Rated Capacity : 2 mV/V (Full Wheatstone Bridge Network of Strain Gages)
- Excitation Voltage : 5 to 20 VAC @ Proper Operating Frequency
- Excitation Loading Impedance : 100 Ohm
- Non-Repeatability : 0.01 % of rated output
- Max. Non-Linearity : 0.05 % of rated output
- Max. Hysteresis : 0.05 % of rated output
- Compensated Temperature Range : +70 to 200 ºF
- Useable Temperature Range : -25 to 200 ºF
- Temperature effect on Output : 0.001 % / ºF of rated
- Temperature effect on Zero Balance : 0.001 % / ºF of rated
- Min. Insulation Resistance : 5,000 Mega-Ohm
- Typical Zero Balance : 2 % of rated output