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SKF TIH 100m
1. Introduction
The SKF TIH 100m induction heater is designed to heat bearings, which are mounted with
an interference fit onto a shaft. The heat causes the bearing to expand, which eliminates
the need to use force during installation. A 90 °C (162 °F) temperature difference
between the bearing and shaft is generally sufficient to enable installation. At an ambient
temperature of 20 °C (68 °F), the bearing must therefore be heated to 110 °C (230 °F).
1.1 Intended use
The TIH 100m has been designed to heat rolling bearings. However, other metal
workpieces that form a closed circuit can also be heated. Examples of acceptable
workpieces include bushings, shrink rings, pulleys, and gears. All bearings that fit over the
inductive coil and between the vertical supports with the top yoke in place can be heated
using the TIH 100m. In addition, smaller bearings can be placed over any of the three
standard yokes. See the illustrations at the beginning of this manual for examples.
1.2 Principle of operation
The principle of operation of the TIH 100m can be
compared to a transformer. The high voltage, low
electrical current flowing through a large number
of windings in the TIH 100m’s inductive coil
induces low voltage, high current electricity in the
workpiece. Because the workpiece has the electrical
characteristics of a coil with a single, short-circuited
winding, the high current generates heat within the
workpiece. Because the heat is generated within the
workpiece, all of the heater components remain cool.
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