CAT. NO. 2202/TE Although care has been taken to assure the accuracy of the data compiled in this catalog, TPI does not assume any liability to any company or person for errors or omissions. For further updated information, Please contact TPI.

Technical Data 1. Construction and Characteristics of Rolling Bearings 1.1 Rolling bearing construction Most rolling bearings consist of rings with raceways(an inner and an outer ring), rolling elements(either balls or rollers) and a cage. The cage separates the rolling elements at regular intervals, holds them in place within the inner and outer raceways, and allows them to rotate freely. See Fig. 1.1. Theoretically, rolling bearings are so constructed as to allow the rolling elements to rotate orbitally while also rotating on their own axes at the same time. While the rolling elements and the...

bearings. There are two major types of sealed bearings: contact type and non-contact type sealed bearings. The LLU type is equipped with two contact seals, one on each side of the bearings while the LLB type uses non-contact type seals instead. Similar construction to LLU type, the LLH type sealed bearings perform better low torque characteristics than that of LLU type because of its special lip design. Basically, bearings with contact seals have excellent and effective functions of dust and water proofing while bearings with non-contact seals are suitable for applications requiring low torque...

High polymer material dimensions and ISO tolerance as standard deep groove ball bearings, but have better corrosive resistance than standard bearings in special environments. The rings and balls of these bearings are made of martensite stainless steel with hardness at least HRc 58 , while cages and shields are made of austenite stainless steel, please refer to 8. Bearing Material for their chemical composition. 1.3 Cylindrical roller bearings Fig. 1.3 Expansion compensating bearing Fig. 1.5 Angular contact ball bearing axial rigidity. In high speed spindle application, angular contact ball bearings...

2. Bearing Number Codes Rolling bearing part numbers indicate bearing type, dimensions, tolerances, internal construction, and other related specifications. Bearing numbers are comprised of a “basic number” followed by “supplementary codes.” The makeup and order of bearing numbers is shown in Table 2.1(Number and code arrangement for deep groove and miniature ball bearings), and Table 2.6(for needle roller bearings). Table 2.1 Number and code arrangement for deep groove and miniature ball bearings Number and code arrangement Supplementary prefix code Basic numbers Special application code Material/heat...

Table 2.4 Bore diameter code Table 2.5 Supplementary suffix code Bore diameter Bore diameter C2 Radial internal clearance less than Normal Bore diameter code in double digits after dividing bore F1 Machined steel cage Slash ( / ) before bore diameter code Machined brass cage G1 Machined brass cage, rivetless Cage G2 Pin-type steel cage J Pressed steel cage Bore diameter expressed in single digit T2 Plastic cage, nylon or teflon LLB Synthetic rubber seal (non-contact type) __ LLU Synthetic rubber seal (contact type) LLH Synthetic rubber seal (low torque type) ZZ Shield LLE Better water resistance...

Table 2.6 Number and code arrangement for needle roller bearings code Supplementary prefix code Series code Bearings with cage assemblies treated by soft-nitriding K, KJ, KMJ, Needle roller and cage assemblies PCJ, PK, KBK bearing HK, HMK, BK Basic number Drawn-cup needle roller bearing Bore diameter Dimension code Outside diameter Width Cage assemblies code Suffix supplemental code Seal, shield code LL Welded cage With the synthetic rubber seal on one side(contact type) With the synthetic rubber seal on both side(contact type) Lubrication code Grease for needle bearing Tolerance standard Special...

3. Bearing Tolerances Bearing “tolerances” or dimensional accuracy and running accuracy, are regulated by ISO and JIS B 1514 standards (rolling bearing tolerances). For dimensional accuracy, these standards prescribe the tolerances necessary when installing bearings on shafts or in housings. Running accuracy is defined as the allowable limits for bearing runout during operation. Dimensional accuracy constitutes the acceptable values for bore diameter, outer diameter, assembled bearing width, and bore diameter uniformity as seen in chamfer dimensions. Running accuracy constitutes the acceptable...

4. Load Rating and Life 4.1 Bearing life When in service, even a bearing that is properly lubricated, properly installed, and adequately protected from abrasives, moisture, and corrosive reagents, can fail from material fatigue. Material fatigue is manifested as flaking off of metallic particles from the surface of a raceway or rolling element. This flaking will eventually cause the bearings to fail. The effective life of a bearing is usually defined in terms of the total number of revolutions a bearing can undergo before flaking of either the raceway surface or the rolling element surfaces occurs....

Formula (4-2) can also be expressed as shown in formula (4-5). The relationship between rotational speed n and speed factor as well as the relation between the basic rating life and the life factor is shown in Fig. 4.1. 4.3 Machine applications and requisite life When selecting a bearing, it is essential that the requisite life of the bearing be established in relation to the operating conditions. The requisite life of the bearing is usually determined by the type of machine in which the bearing will be used, and duration of service and operational reliability requirements. A general guide to...

4.5 Bearing load distribution For shafting, the static tension is considered to be supported by the bearings, and any loads acting on the shafts are distributed to the bearings. For example, in the gear shaft assembly depicted in Fig. 4.2, the applied bearing loads can be found by using formulas (4-9) and (4-10). where, FrA : Radial load on bearing A (N or kgf) FrB : Radial load on bearing B (N or kgf) FI , FII : Radial load on shaft (N or kgf) Fig. 4.2 Gear Shaft [Example 1] What is the rating life in hours of operation (L10h ) for deep groove ball bearing 6207 operating at 650 r/min, with a...