Drive Shafts
 

DANA Commercial Drive Shafts Catalogue

Installation and Maintenance
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Balancing of cardan shafts

The cardan shafts used in motor vehides are balanced.

This balancing is performed to equalize eccentrically running masses, thereby preventing vibrations and reducing the bad on downstream units as a result of free centrifugal forces.

Balancing is carried out in accordance with IS0 Standard 1940. "Balance quality of rotating rigid bodies". According to this standard, the permissible residual imbalance is dependent on the quality grade and operating speed of the balanced component. If the customer does not specify a balancing speed or quality grade, balancing is per formed to GWB Standard 4100-005. This standard reflects the following criteria:

Balancing speed
The balanclng speed is selected from a graded scale determined for various cardan shaft sizes. These balancing speed levels are defined on the basis of statistical evaluations of the r.p.m. conditions prevailing in the associated vehicle categories.
Quality grade
In defining a quality grade, it is necessary to consider the reproducibility levels achieveable in the customer's own test rig during verification testing. Quality grades are dependent on the following variables:
- type of balancing machine (hard, rigid or soft suspension)
- accuracy of the measuring system
- joint bearing radial play
- angular backlash in Iongitudinal displacement direction


FieId analyses have shown that the sum of these factors may result in inaccuracies of up to 80%. This observation has given rise to the definition of the following balancing quality grades:
- factor balancing: G16
- customer verification tests: G32

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