From Solving Tribology Problems in Rotating Machines

2.1 A General Review

This chapter deals with the functional performance of roller bearings on a roller-bearing test rig for the acceptance of bearings in routine application in different products. The salient features of bearing test philosophy and analysis of test data collected on the tested bearings pertaining to temperature rise, vibration, shock pulse and kurtosis analysis under identical operating parameters in different stages of operation are bought out. The investigations reveal that under light and medium operating parameters the performance of identical bearings of different makes are in general within acceptable limits. However, under higher stipulated operating parameters, the behaviour and functional performance of identical bearings of different makes differ from each other, both in life expectancy and general performance characteristics.

2.2 Introduction

Demands on the reliable performance of various components, in particular rolling-element bearings, have increased considerably. High reliability and successful functioning of the bearings are prerequisites if complex machines and equipments are to operate satisfactorily. That is why newly designed and developed bearings are subjected to extensive testing to ensure maximum operational reliability in service.1

When planning reliability tests, the minimum laboratory test duration has to simulate as far as possible the actual service conditions. It is unwise to shorten the test duration by using an unrealistically high load, as this can incur the risk of the results being false. Also, under increased load, the shaft deflection will be larger, which will result in additional forces acting on the bearing, and may cause premature bearing failure.

The...


Products & Services
Roller Bearings
Roller bearings are used in rotary applications to replace sliding movement with low friction, rolling motion. The principal types of roller bearings are cylindrical, spherical, and tapered.
Ball Bearings
Ball bearings are used to provide smooth, low friction motion in rotary applications. Ball bearings types include radial ball bearings (deep groove and angular contact) and thrust ball bearings.
Flange Mounted Bearings
Flange mounted bearings are used when a shaft axis is perpendicular to the bearing mounting surface. They are available in 2, 3, or 4-hole configurations.
Super Precision and Spindle Bearings
Super precision and spindle bearings are high-precision bearings that are designed for use in machine-tool spindles and other precision applications. Most super precision bearings and spindle bearings carry a high quality-rating such as ABEC-7 or ABEC-9, and run coolly and smoothly at high speeds.
Needle Roller Bearings
Needle roller bearings are a type of radial roller bearing with rollers whose length are at least four times their diameter. These bearings are valued for their high load capacity and low sectional height.

Topics of Interest

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