The bearing is defined as a component contains rolls between outer and inner rings, and it reduce the friction of the fitted face on the gyration.
Usually, the inner ring is set into the shaft and the outher ring is set into the fixed part of itself.

With the development of technology, the berings are widely for vehicles, wind power generation, iron manufacture and many others.

Because the bearing is the precision equipment,  select the work placeas clean as possible to prevent entry of the dust and free from the rust and damage.

Especially, solid dirt gives the bad influences to the bearing such as acceleration of bearingwearing down, damage of the fitted face, andincrease of abnormal noise and vibration.

When the hard impact is given into the bearing,it will be the serious cause of the deteriorating its ability and breaking at early stage because of the cracks and scratches on the orbit side.
Therefore, it is required to handle the bearing with the special cares.

To bring its ability into full play and avoid sliding each other, the inner ring must be fixed into the shaft, and the outer ring must be fixed into the housing. Therefore, the appropriate interference of bearing with shaft will be provided.

If this interference of bearing with shaft was not enough, the space between shaft and inner ring brings up, for the slide would happen like a figure on right.

This slide of the fitted face of the bearing will be the cause of the frictional vibration, abnormal generation of the heat, and other troubles.

The method of Fitting with a press is widly used for small bearings.
A mounting tool is placed on the inner ring and the bearings is slowly pressed on the shaft with a press until the side of the inner ring rests against the shoulder of the shaft.

The mounting tool must not be placed on the outer
ring for press mounting since the bearing may be damaged.

The method of Fitting with a hammer should only be used for small ball bearings with minimally tight fits and when a press is not available. In the case of tight interference fits or for medium and large bearings, this method should not be used. Any time a hammer is used,a mounting tool must be placed on the inner ring.

Shrink Fits

Since large bearings requires a large force on press fitting, the method of shrink fit is widely used. The bearings are heated in oil to expand them before mounting.

Bearings are not imposed the excessive force and able to be heated in a short time in this method.

Use of direct flame or blow torch to heat up bearing is risky, hazardous and causes uneven thermal expansion and/or material alteration. ETOH’s Bearing Heater adopts electromagnetic principle to inducing uniform current distribution inside bearing to be heated evenly for equal thermal expansion without damage to bearing(s). This even bore diameter extension eliminates any shrink fit process troubles at mounting bearing(s) into a shaft and increases the work efficiency.

ETOH’s Bearing Heater is based on the simple model of transformer with exciting coils embedded into a core as primary windings and bearing recognizable as the secondary windings. AC current flowing the coils induces a secondary current along the inner ring of bearing to generate heat necessary for its expansion due to bearing’s own electrical resistance. This simplicity realizes rapid and economic heating of bearing solely and little waste of energy without necessity of media material like oil. Etoh’s Bearing Heater of non-use of fire and oil accomplishes High Safety, Reliability and Efficiency for drastic reduction of the total time and cost necessary for Shrink Fit Process in comparison with the other methods.

The use of oil bath for the shrink fit process has demerits such as wipe-off required after hot oil bathing, troublesome management and storage of oil, and complicated and costly control and maintenance of oil bath equipment. In addition, the method cannot heat pre-greased bearing(s) without loss of the grease and loses pre-lubrication inside bearing(s). Etoh’s Bearing Heater, due to its inherently clean and simple nature of non-use of oil, has no demerit as such and requires no extra management and maintenance task and no contamination to environment, leading to total improvement of Workshop Environment.

Principles of induction heating

High current passes through the bearing via electromagnetic induction when the heating coil is energized and the bearing is heated with its charged electric resistance. This makes for fast, uniformly, clean and safe heating of the bearing.

Difference between other bearing heater manufacturers

Horizontal heating core employed by other manufacturers has the disadvantages described below. Our vertical heating core is easy to operate overcoming these disadvantages.