TAPERED ROLLER BEARINGS
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Inch Series TAPERED ROLLER BEARINGS The contents of this catalog are subject to change without prior notice. Every possible effort has been made to ensure that the data herein is correct; however, JTEKT cannot assume responsibility for any errors or omissions. Inch Series TAPERED ROLLER BEARINGS Reproduction of this catalog without written consent is strictly prohibited.

Inch Series TAPERED ROLLER BEARINGS

Publication of New Inch series Tapered Roller Bearing Catalog Allow us to express our heartfelt appreciation for your valuable patronage. At this time we are pleased to provide you with our new Koyo Inch Series Tapered Roller Bearing Catalog. JTEKT Corporation has long enjoyed a strong reputation as a maker of inch-series tapered roller bearings from the time of its predecessor Koyo Seiko, and in recent years we have continued intense R&D activities to make improvements in such areas as the size, weight, and environmental friendliness of these bearings. The fruits of these efforts are...

TAPERED ROLLER BEARINGS Contents Technical section 1 Outstanding features of tapered roller bearings ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 4 2 Structure of tapered roller bearings ⋅⋅⋅ 5 2.1 Single-row ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 5 2.2 Double-row ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 6 3 Bearing service life ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 8 3.1 Bearing service life ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 8 3.2 Basic dynamic load ratings ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 8 3.3 Calculation of service life...

1 Outstanding features of tapered roller bearings 1 Outstanding features of tapered roller bearings 1) Higher load ratings Tapered roller bearings with higher load ratings can accept radial loads or axial loads in one direction and combined radial and axial loads. This type of bearing is suitable for use under heavy load or impact load. 2) The cup can be mounted separately from the cone assembly Since the cup is separable from the cone assembly, the cone assembly can be installed on the shaft and the cup in the housing, individually. This feature facilitates mounting of the bearing while...

2 Structure of tapered roller bearings 2.1 Tapered roller bearings consist of cup, cone, rollers and a cage. This bearing contains tapered rollers for its rolling element which are guided by the cone backface rib on the roller large end face. Roller Cone The raceway surfaces of cone and cup and the rolling contact surface of rollers are designed so that the respective apexes converge at a point on the bearing center line. Bearings are classified into standard, intermediate and steep types, in accordance with their contact angle (α). The larger the contact angle is, the greater the bearing...

2 Structure of tapered roller bearings ( Double-row (Face to face) The TDI type bearing is made up of two single-row cups and one double cone, and is generally provided with a cup spacer. The bearing with cup spacer is handy for mounting, as its end play has been pre-adjusted for each application. The spacer is provided with an lubrication groove and several lubrication holes. Used for roll neck of medium-duty rolling mills, speed reducers, etc. The TDIS type bearing is of the same construction as the TDI type, except that it has larger contact angle so that it can accommodate heavier axial...

( Double-row (Back to back) The TDO type bearing is made up of one double cup, two single-row cones and one cone spacer. The cup is provided with several lubrication holes. The cone spacer has been adjusted to provide an end play suitable to each application. It is also possible to freely adjust the end play for use by removing the cone spacer, however, it requires time and labor. Suitable to case where moment may act. Used for speed reducer, winding machine, etc. TDO, TDOS type (page 126) The steep angle type (TDOS type) having large contact angle has increased axial load capacity, and is...

3 Bearing service life 3 Bearing service life 3.1 Bearing service life When bearings rotate under load, material flakes from the surfaces of cone and cup or rolling elements by fatigue arising from repeated contact stress. This phenomenon is called flaking. The total number of bearing rotations until flaking occurs is regarded as the bearing "(fatigue) service life". "(Fatigue) service life" differs greatly depending upon bearing structures, dimensions, materials, and processing methods. Since this phenomenon results from fatigue distribution in bearing materials themselves, differences in...

3.4 Correction of basic dynamic load rating for high temperature use and dimension stabilizing treatment In high temperature operation, bearing material hardness deteriorates, as material compositions are altered. As a result, the basic dynamic load rating is diminished. Once altered, material composition is not recovered, even if operating temperatures return to normal. Therefore, for bearings used in high temperature operation, the basic dynamic load rating should be corrected by multiplying the basic dynamic load rating values specified in the bearing specification table by the...