Test rigs intended for endurance tests reproducing actual sideshafts operating conditions in the vehicle; both real-time –road profile– signals and plateau type multi-block programs can be reproduced.
The design based on the well-known 4-square principle brings a great productivity with a high energy-efficiency being capable of testing up to 4 sideshafts (8 CVJ) simultaneously. The test rig consists of two gearboxes whose respective teeth wheels (corners) are linked through the four specimens tested; torque loop is created by means of a Spinning Torque Actuator.
Main rig rotation and power loses are provided via two identical AC motors each one driving at opposite corners of the rig and arranged to load-share compensating internal torque loses both in the shafts’ joints and in the test rig’s gearboxes so that it can be minimized the torque variation acting in all specimens around the loop. For this purpose, the test rig control system includes a special regulation feature.
Besides torque and speed, can be included either Steering Angles or Jounce (Suspension) Displacement by means of recirculating ball screw electro-mechanical cylinders driven with servomotors. The temperature of the specimens’ joints is monitored with pyrometers and air-cooling systems can be included.
Performance of these test rigs for standard configurations:
- Torques up to 4000 Nm
- Spinning speeds up to 3000 rpm
- Torsion angle gradient to 100 deg/s for servo-electric Spinning Torque Actuator and up to 600 deg/s for servo-hydraulic torque actuator
- Steering angle velocity to 30 deg/s
- Jounce velocity to 700 mm/s