Ball & Roller Bearings Ball & Roller Bearings Ball & Roller Bearings

1 Structures and types ⋅⋅⋅⋅ A 1 4 Selection of arrangement ⋅⋅⋅⋅⋅⋅⋅⋅ A 20 10 Internal clearance ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ A 99 2 Outline of selection ⋅⋅⋅⋅⋅⋅⋅ A 14 5 Selection of dimensions ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ A 24 8 Limiting speed ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ A 84 3 Selection of type ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ A 16 dimensions 6 Boundary and bearing numbers ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ A 52 and ⋅⋅⋅⋅⋅⋅⋅⋅ A 133 14 Shaft housing design Locating snap ring type ⋅⋅⋅ B 32 N NR Extra-small & miniature ⋅⋅⋅ B 40 (flanged type ⋅⋅⋅ B 46) Technical section Deep groove ball Angular contact ball bearings Extended inner ring type ⋅⋅⋅ B 134 Self-aligning ball Bearing...

BALL & ROLLER BEARINGS

A New Legacy Begins April 2022 Starting in April 2022, JTEKT Corporation began unifying its Koyo and Toyoda global brands to the JTEKT brand. For bearings this means the Koyo brand name and logo will transition to JTEKT. This step is intended to guarantee a unified market presence of our globally operating company. Please be informed that this is only a change of brand name and logo. The company, the people, the products, the services and the corporate structure will remain the same. You can rely on the continued outstanding service and product quality in the future under the JTEKT brand name...

Contents Technical section Rolling bearing structures and types Bearing fits [Introduction of products, pamphlets and catalogs] Outline of bearing selection Selection of bearing type Selection of bearing arrangement Selection of bearing dimentions [Standard bearings] Supplementary tables

1. Rolling bearing structures and types 1-1 2) Rolling element Rolling elements may be either balls or rollers. Many types of bearings with various shapes of rollers are available. Ball Cylindrical roller (LW ² 3 DW)* Rolling bearings (bearings hereinafter) normally comprise bearing rings, rolling elements and a cage. (see Fig. 1-1) Rolling elements are arranged between inner and outer rings with a cage, which retains the rolling elements in correct relative position, so they do not touch one another. With this structure, a smooth rolling motion is realized during operation. Bearings are classified...

1. Rolling bearing structures and types Radial ball bearing Deep groove ball bearing Angular contact ball bearing Radial bearing Bearings classified by use Single-row Matched pair or stack Four-point contact ball bearing Cylindrical roller bearing Single-row Needle roller bearing Rolling bearing Spherical roller bearing Thrust ball bearing Thrust bearing Thrust roller bearing Construction equipment Steel industry equipment Single direction with aligning seat race Single direction Tensioner bearing unit Double direction with aligning seat races Paper manufacturing equipment [Aircraft] Integral...

1. Rolling bearing structures and types \ JTEKT Table 1-1 Deep groove ball bearings Table 1-2 Angular contact ball bearings "G type" bearings are process-' ed (with flush ground) such that the stand-out turns out to be S1= S2. The matched pair DB, DF, and DT, or stack are available.

1. Rolling bearing structures and types \ JTEKT Table 1-4 Self-aligning ball bearings Table 1-5 Cylindrical roller bearings Table 1-3 Four-point contact ball bearings Cylindrical bore Tapered bore ■ Radial load and axial load in both directions can be accommodated. Cylindrical bore Tapered bore NNU4900 NNU4900K NN3000 NN3000K Mainly use on rolling mill roll neck ■ A four-point contact ball bearing can substitute for a face-to-face or back-to-back arrangement of angular contact ball bearings. ■ Suitable for use under pure axial load or combined radial and axial load with heavy axial load. ■ This...

1. Rolling bearing structures and types Machined ring needle roller bearings With inner ring Without inner ring With inner ring Without inner ring n In spite of their basic structure, which is the same as that of NU type cylindrical roller bearings, bearings with minimum ring sections offer space savings and greater resistance to radial load, by using needle rollers. n Bearings with no inner rings function using heat treated and ground shafts as their raceway surface. [Recommended cage] Pressed cage [Main applications] Automobile engines, transmissions, pumps, power shovel wheel drums, hoists,...

1. Rolling bearing structures and types \ JTEKT Table 1-9 Thrust ball bearings Table 1-8 Spherical roller bearings Housing race back face chamfer Housing race back face [Remark] The race indicates the washer specified in JIS.

;y 1. Rolling bearing structures and types \ Table 1-10 Cylindrical roller thrust bearings Single direction ■ This type of bearing comprises washer-shaped rings (shaft and housing race) and cylindrical roller and cage assembly. Crowned cylindrical rollers produce uniform pressure distribution on roller/raceway contact surface. ■ Axial load can be accommodated in one direction. ■ Great axial load resistance and high axial rigidity are provided. [Recommended cages] Copper alloy machined cage [Main applications] Oil excavators, iron and steel equipment Table 1-11 Needle roller thrust bearings ■...

2. Outline of bearing selection Currently, as bearing design has become diversified, their application range is being increasingly extended. In order to select the most suitable bearings for an application, it is necessary to conduct a comprehensive study on both bearings and the equipment in which the bearings will be installed, including operating conditions, the performance required of the bearings, specifications of the other components to be installed along with the bearings, marketability, and cost performance, etc. In selecting bearings, since the shaft diameter is usually determined beforehand,...