Go back

Balancing and Diagnostic System for Rear-Axle Modules JAC-I/A - Schenck South Africa

  • Balancing of the drive train
  • Testing the rear axle drive in the installed condition (NVH = Noise vibration harshness,VAD = Vibro-acoustic diagnosis)
  • Function test
  • Automatic test sequence

Special features

  • Modular construction as a single station with free positioning of test part (installation position)
  • Powerful industrial PC for control of the test sequence and measured value processing
  • Software module for VAD procedure and measurement of static unbalance; large rotor type data memory, operator prompting, diagnostic program, statistics, process control, external interfaces
  • Single or multiple-channel noise checking with integrated unbalance recognition
  • Flexible application, easy change over for various rearaxle modules
  • Special system adaptation to the requirements of objective noise testing, such as structural isolation of the test equipment as well as high-repeatability, test part coordinated sensor coupling of the test part support.
  • Automatic coupling of the part at the shaft ends
  • Automatic recognition of the possible correction position
  • With manual correction automatic indexing to the correction position and display of the correction weights 
  • Protection against shaft breakage.

Range of application

Quality testing of drive modules (front-mounted rear-axle with drive shafts) of passenger vehicles and light commercial vehicles.

Suitable for measurement and correction of the unbalance, improvement of the NVH characteristics through vibro-acoustic evaluation of the assembly structure as well as diagnosis of the noise properties of components (differential, drive shaft, bearing).

Application in production, integrated into the assembly line.


Single-station machine with fully automatic test sequence, loading and unloading by a pallet system.

Consisting essentially of vibration isolated machine frame for testing as if installed, measurement and control cabinet with test-stand PC and drive, positioning device for adaptation to the work-piece type on hand, protective enclosure.

Sequence of operations

  • Transport the rear-axle module on pallet by roller conveyor and close the protective equipment (loading door)
  • Lift the pallet, clamp, couple the drive and synchronizer, attach the sensors for unbalance measurement, lower the pallet, close the safety devices.
  • Fully automatic test sequence: Check the length of the drive shaft (with type mix), run up and regulate the load, measure the required torque and differential ratio, measure the initial unbalance, structure-borne sound and the possible test weight and correction positions, brake, index, add the test weight, and carry out a further measuring run, brake, index, remove the test weight, calculate the co- efficient and initial unbalance. Compare with tolerances (for coefficient and unbalance).
  • When out of tolerance: Index for unbalance correction, open the operating doors, manually add the unbalance correction according to the display, close the doors and perform a check run.
  • When in tolerance: Mark, travel to home position, open loading doors, move the pallet out.
Technical data
Technical data at a glance    JAC-I/A 
Measuring unit    IPC 
Unbalance determination    • 
Manual unbalance correction    • 
Vibro-acoustic diagnostic    • 
Drive simulation through     
test part loading equipment    • 
Rear-axle module, complete     
Weight  [kg]  50 - 200 
Dimensions  [mm]  a.A. 
Width A 1)  [mm]  4800 
Depth B 1)  [mm]  3600 
Height C 1)  [mm]  2600 
Sampling rate, VAD- 4)  [kHz]   20 
Drive load, max.  Nm  130 
Test speed  [min -1]  1500 - 5000 
Measurement uncertainty, approx. 2)  [gmm]  25 
Cycle time, approx. 3)  [s]  120 
Air pressure  [kPa]  600 
Power consumption  [kVA]  11 
Basic machine  Order No.  R0560100.01 
Automatic test weight application  Order No.  R0560101.01 
Type identification  Order No.  R0560102.01 
1) Data non-binding, dependent on respective equipment     
2) Acc. to DIN 1319, 95% probability, workpiece dependent     
3) Dependent on unbalance correction method and integration with other equipment     
4) Dependent on the selected test speed     
o.r. On request