Drive Shafts
 

DANA Industrial Drive Shafts Catalogue

Technical directions for application
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Balancing of cardan shafts

This balancing of cardan shafts is performed to equalize eccentrically running masses, thereby preventing vibrations and reducing the load on any connected equipment.

Balancing is carried out in accordance with IS0 Standard 1940. "Balance quality of rotating rigid bodies". According to this standard, the permissible residual unbalance is dependent on the operating speed and mass of the balanced components.

Our experience has shown that balancing is not normally required for rotational speeds below 500 rpm. In individual cases this range may be extended or reduced, depending on the overall drivetrain characteristics.

Cardan shafts are balanced in two planes, normally to a balancing accuracy between G16 and G40.

Balancing speed
The balancing 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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