everything that rotates
                        needs to be balanced



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Test REsults Introduction - Page 2 of 6

drive shaftThe primary cause of drive shaft vibration is mass imbalance due to manufacturing tolerances, defects, uneven welding, among others. During normal operation, erosion or build-up of debris (Figure 2) can also contribute to the mass imbalance leading to violent vibration.

Test Objective

The purpose of this test was to evaluate the ability of the XYO balancer technology to automatically balance an automotive drive shaft (Figure 2).

Test Overview

A test rig was built in order to evaluate the performance of the XYO technology (Figure 3).

Stub shafts were connected to each end of the main shaft universal joints. The stub shafts were supported by two bearings mounted to a rigid plate.

The driveshaft’s rotational velocity was measured by an optical key-phasor. Four velocity transducers were used to measure vibration at the differential end and the driven end.

Two prototype XYO balancers were mounted, one at each end of the driveshaft. One XYO balancer was mounted on the slip yoke at the driven end as shown in Figure 4. The other XYO balancer was mounted on the 4” shaft close to the yoke located at the differential end.

Mass imbalances of 6.86oz-in and 9.14oz-in were applied at either end of the driveshaft and tested with and without the prototype XYO balancers; the test conditions were as follows:

  • No mass imbalance
  • 6.86oz-in at differential end
  • 9.14oz-in at driven end
  • 6.86oz-in at differential end & 9.14oz-in at driven end

Vibration measurements were taken from 1500RPM to 2250RPM to show the benefits of the XYO balancer over a large operating range of the driveshaft.

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Reports Under Development:

ic engine centrifuge