cylindrical roller bearing catalog Timken thrust and plain bearings catalog

Spherical Plain Bearings SPHERICAL PLAIN Overview: Timken’s spherical plain bearings consist of a spherically ground inner ring housed in a mating outer ring without any rolling elements. • izes: 12.7 mm - 600 mm bore (0.5 in. - 23.622 in.). S • arkets: Construction, mining, metals, power generation, oils and gas, M aggregate, paper and forest products. • pplications: Articulation joints, A-frames, cylinders (steering, lift, tilt, dump), A struts, traction bars. • eatures: Lubrication grooves and holes, seals to retain lubricant and F prevent contamination, special materials available. • enefits:...

spherical Plain Bearings Spherical Plain Bearings One, two, or three digit “Series” number. For inch series, the number indicates the nominal bore size (e.g., 10 is 1.00 in.) or an approximate bore size (e.g., 17 is 1.75 in.). Seal Designator: TT reinforced rubber seals For metric series, the number indicates the exact bore size (e.g., 40 is 40 mm). SS synthetic resin seals SF spherical plain type (radial inch); single fractured outer ring 12 – SS One, two, or three digit number. SFH spherical plain type (radial inch); single fractured outer ring, wide inner ring For inch series, the number indicates...

Spherical Plain Bearings Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B418 General Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B418 BEARING TYPES SF & FS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B418 SF…TT, SF…SS, FS…TT, FS…SS. . . . . . . . . . . . . . . . . . . . . . . B418 SBT & SBDT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B418 Internal Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B419 Load Ratings...

spherical Plain Bearings INTRODUCTION GENERAL FEATURES The spherical plain bearing has a spherically shaped inner ring with a ground cylindrical bore for shaft mounting. The cylindrical outer surface of the outer ring permits convenient mounting in a housing. Spherical plain bearings offer the following advantages: • High capacity • Ability to accommodate misalignment • Superior performance in low frequency oscillating applications • Simplified housing and shaft design • Easy installation • Radial types available with seals For all types of spherical plain bearings, both the inner and outer rings...

Spherical Plain Bearings INTERNAL CLEARANCES Radial internal clearance is defined as the total possible movement of the inner ring relative to the outer ring in a radial direction. Axial internal clearance is the total possible movement of the inner relative to the outer ring in an axial direction. Radial internal clearances listed for the SF and FS Series are for finish ground, unmounted bearings prior to fracture of the outer ring. The molybdenum disulfide coating reduces this clearance by a maximum of .05 mm (.002 in.). The maximum interference fits using suggested housing and shaft dimensions...

spherical Plain Bearings MISALIGNMENT In many applications, the degree of misalignment of the radial types of spherical plain bearings is determined by the side clearance between the yoke and the bearing housing as illustrated. When the bearing is mounted without such restrictions, a larger misalignment can be accommodated: α is the maximum angle of misalignment for sealed bearings as illustrated. If α is exceeded, the seal lips will slide off the spherical surface. Seal effectiveness is then lost and damage to the seal lip will occur if contact is made between the seal lip and shaft shoulder....

Spherical Plain Bearings HOUSING DESIGN The housing should be strong enough to support the loads applied to the bearings without distortion or risk of fatigue damage. When using a housing of the type illustrated, with a load applied in directions “X” or “Y”, the compressive yield strength of the housing material should be greater than the applied load divided by (Ba • D). When the load is applied in direction “Y”, the yield strength of the housing in tension should be greater than the applied load times K/Ba(Da-D), where K is a stress concentration factor from Table 1. The suggested housing bore...

spherical Plain Bearings LUBRICATION (SF, FS, SBT) The dry film lubricant (MoS2) is sufficient for static applications and for relatively short periods of dynamic operation. The bonds between the rings and MoS2 coating may be destroyed by any fluid including oils, greases and water. Any abrasive material present on the dynamic bearing surfaces will ruin the MoS2 coating. If the bearing is subjected to such operating or environmental conditions, it is necessary to relubricate frequently. The radial bearings, both with and without seals, have lubricating holes and grooves in both the inner and...

Spherical Plain Bearings TOLERANCES • Tolerances on pages B412-B420 list the nominal bearing dimensions. • Tolerances for these dimensions are listed in Tables 1 through • Metric-inch conversions are shown in the following tables. 4. They are expressed as variances from nominal. Table 1 Inner Ring (FS, FSH) Bearings, Metric SERIES Bore Diameter, d Single Mean Width, B1 Bore Diameter, dmp(1) mm inch mm inch mm (1) “Single Mean Diameter” is defined as the mean diameter in a single radial plane. Table 2 outer Ring (FS, FSH) Bearings, Metric SERIES Outside Diameter, D Single Mean Width, B Outside...

spherical Plain Bearings RADIAL BEARINGS TYPE SF • The axial internal clearance is approximately three times the radial internal clearance. • α is the maximum tilting angle for sealed radial bearings. • Unit assembly consisting of a solid, spherical O.D. inner ring and a spherical I.D. outer ring. • Outer ring has a single fracture to permit assembly. • Both inner and outer rings are phosphate treated and then coated with molybdenum disulphide (MoS2). • Bearings 7SF12 through 50SBB80 are available with • • • • To utilize the maximum tilting angle α for unsealed Radial Bearings diameter, dradial...