Backing ring is a sure fit

US bearing giant Timken has developed a universal backing ring for rail car axles that helps to provide an interference fit between the axle dust guard diameter section and the backing ring.

The Sure-Fit from bearing giant Timken is a universal backing ring that helps to provide an interference fit between the axle dust guard diameter section and the backing ring.

On untoleranced axles, this significantly reduces the potential for the backing ring to loosen in service.

‘Loose backing rings have plagued the industry for more than 30 years, costing railways more than $60 million each year in premature wheel set removals,’ said Mathew W. Happach, president – rail.

‘We designed the Sure-Fit universal backing ring as a part for use on both untoleranced and toleranced axles and with new or reconditioned bearings,’ added David G. Toth, chief engineer – rail.

‘It can be applied to axles with dust guard diameters of up to 0.050″ below the nominal size on a toleranced axle, meaning an axle which is properly dimensioned for a standard fitted backing ring application.’

The Sure-Fit universal backing ring offers enhanced journal axle fillet protection and can improve safety and reliability. It recently received conditional approval by the Association of American Railroads (AAR).

Timken’s rail business offers Timken AP, SP and AP-2 bearings, which are self-contained, pre-assembled and pre-lubricated tapered roller bearings. Timken also supplies the HDL seal and other related products and services, including rail bearing grease and reconditioning services.

On the web