ENGINEERING BEARING TYPES AND CAGES
STAMPED-STEEL CAGES The redesigned Timken速 EJ bearings incorporate a unique stamped-steel cage design. The EJ design includes two independent cages, one for each row of rollers, which are assembled into an individual bearing. This feature serves to prevent cage bending when the operating environment is favorable for this to occur. This cage is guided on the inner ring and runs above pitch. Each cage is surface hardened (nitrided) to provide improved wear resistance as well as additional strength to allow the bearing to operate in even the most severe environment. Face slots have been designed for improved lubrication flow. This can result in a lower operating temperature and longer bearing life.
Fig. 7. One-piece, machinedbrass, roller-riding, finger-type cage.
Fig. 8. One-piece, machinedbrass, land-riding, finger-type cage.
Fig. 9. Split, machined-brass, land-riding, finger-type cage. Fig. 4. EJ bearings.
Fig. 5. EJ cage.
MACHINED-BRASS CAGE
PIN-TYPE CAGES
EM, EMB, YM, YMB and YMD bearing cages are precision- machined from brass as shown in figs. 7-9. Their rugged construction provides an advantage in more severe applications. The open-end, fingertype design permits lubricant to reach all surfaces easily, ensuring ample lubrication and a cooler running bearing.
Large diameter spherical roller bearings can be supplied with these cages. Pin-type cages, one for each row of rollers, consist of two rings and a series of pins running through the center of the rolling element. The design of pin-type cages permits an increased roller complement, giving the bearing enhanced loadcarrying ability. Consult your Timken engineer for suggestions on the application of this cage.
EM, EMB, YM and YMB are all one-piece designs that are differentiated by their means of guidance within the bearing. With EM and YM designs, the cage mass is low and the rollers are used for guidance, while EMB and YMB cage designs typically have more mass and guide on the inner ring. YMD cages are similar to YMB, except they have a two-piece design. Two independent cages, one for each row of rollers, are assembled into an individual bearing. This allows each row of rollers to rotate independently when required by the application, and prevents bending of the cage fingers.
YM/EM
YMB/EMB
Fig. 10. Pin-type cage.
YMD
Fig. 6. Machined cages. TIMKEN SPHERICAL ROLLER BEARING CATALOG
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