Machinery's Handbook, 31st Edition
2450
Ball and Roller Bearings Table 1f. Types of Rolling Element Bearings and Their Symbols TAPERED ROLLER BEARINGS — INCH
Symbol
Description
Symbol
Description
Two row, double-cone single cups Two row, double-cup single cone nonadjustable
TS Single row
TDI
Two row, double-cup single-cone adjustable
TDO
TNA
TQD, TQI
Four row, cup adjusted
TAPERED ROLLER BEARINGS — METRIC
Symbol
Description
Symbol
Description
TS Single row, straight bore
TSF Single row, straight bore, flanged cup
Double row, straight bore, two single cones, one double cup with lubrication hole and groove
Double row, straight bore, two single cones, two single cups
2TS
TDO
THRUST TAPERED ROLLER BARINGS
Symbol
Description
TT
Thrust bearings
is characteristic of several types of needle bearings is the absence of a cage or separator for retaining the individual rollers. Needle bearings may be divided into three classes: loose-roller, outer race and retained roller, and non-separable units. Loose-roller: This type of bearing has no integral races or retaining members, the nee dles being located directly between the shaft and the outer bearing bore. Usually both shaft and outer bore bearing surfaces are hardened and retaining members that have smooth unbroken surfaces are provided to prevent endwise movement. Compactness and high radial load capacity are features of this type. Outer Race and Retained Roller: There are two types of outer race and retained roller bearings. In the Drawn Shell type, the needle rollers are enclosed by a hardened shell that acts as a retaining member and as a hardened outer race. The needles roll directly on the shaft, the bearing surface of which should be hardened. The capacity for given roller length and shaft diameter is about two-thirds that of the loose roller type. It is mounted in the housing with a press fit. In the Machined Race type, the outer race consists of a heavy machined member. Various modifications of this type provide heavy ends or faces for end location of the needle rollers, or open end construction with end washers for roller retention, or a cage that maintains alignment of the rollers and is itself held in place by retaining rings. An auxiliary outer member with spherical seat that holds the outer race may be provided for
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