Purdue University

Purdue University

Mechanical Engineering
Tribology Laboratory

Cage Friction Test Rig

The cage friction test rig (CFTR) is used to measure friction between ball and cage pocket of a bearing under various operating conditions. The loads at the ball-cage interface are applied using the loading arm. The horizontal and vertical traverse mechanisms are used for motion adjustment

 

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Cage Friction Test Rig setup

 

The CFTR is run by a one horsepower, 3450 rpm motor. Speeds of the order of 10000 rpm are achieved by speed step up (3:1) arrangement using a set of pulleys and a belt drive.

The coefficient of friction between the ball and the cage pocket is measured by determining the torque developed on account of the force of friction.

 

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Top view of the horizontal traverse mechanism
 
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Vertical traverse mechanism
 
 
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Closer look at the ball-cage pocket contact

The data from the CFTR is acquired using LABVIEW. The test rig is currently being used to measure coefficient of friction at the ball-cage pocket contact under dry as well as lubricated conditions under various loads.



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