Inch Series TAPERED ROLLER BEARINGS Inch Series • General Bearings • TAPERED ROLLER BEARINGS Inch Series TAPERED ROLLER BEARINGS This catalog has been printed on paper of recycled paper pulp using environmentally friendly soy ink. CAT. NO. B2009E Printed in Japan '09.3-1CDS

Inch Series TAPERED ROLLER BEARINGS Value & Technology

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 reflected...

TAPERED ROLLER BEARINGS Contents Technical section 1 Structure of tapered roller bearings ⋅⋅⋅ 4 2 Outstanding features of tapered roller bearings ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 5 Specification tables 8 Series No. INDEX ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 20 1 TS type ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 34 2 TSS type ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 98 3 TS type Metric "J" series ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 104 3 Bearing service life ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ 6 3.1 Bearing service life ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅...

1 Structure of tapered roller bearings 1 Structure of tapered roller bearings Tapered roller bearings consist of outer ring, inner ring, rollers and a cage. This bearing contains tapered rollers for its rolling element which are guided by the inner ring backface rib on the roller large end face. Outer ring Roller Inner ring The raceway surfaces of inner ring and outer ring and the rolling contact surface of rollers are designed so that the respective apexes converge at a point on the bearing center line. Cage Bearings are classified into standard, intermediate and steep types, in accordance with...

2 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. F 2) The outer ring can be mounted separately from the inner ring assembly Since the outer ring is separable from the inner ring assembly, the inner ring assembly can be installed on the shaft and the outer ring in the housing, individually. This feature facilitates mounting of the bearing while making the design...

3 Bearing service life 3 Bearing service life 3.1 Bearing service life When bearings rotate under load, material flakes from the surfaces of inner and outer rings 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...

3.4 Corrected rating life The basic rating life (L10), expressed using Equation (3.1), is (fatigue) life, whose estimate of reliability is 90 %. A certain application requires a service life whose reliability is more than 90 %. Special materials help extend bearing life, and lubrication and other operating conditions may also affect bearing service life. The corrected rating life can be obtained from the basic rating life using Equation (3.6). Lna = a1 a2 a3 L10 ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ (3.6) where : 106 revolutions Lna : corrected rating life estimated reliability...

4 Equivalent load 4 Equivalent load 4.1 ( When Fa /Fr Dynamic equivalent load Bearings are used under various operating conditions; however, in most cases, bearings receive radial and axial load combined, while the load magnitude fluctuates during operation. Therefore, it is impossible to directly compare the actual load and basic dynamic load rating. The two are compared by replacing the loads applied to the shaft center with one of a constant magnitude and in a specific direction, that yields the same bearing service life as under actual load and rotational speed. This theoretical load is referred...