tailieunhanh - Handbook of Lubrication Episode 2 Part 7

Tham khảo tài liệu 'handbook of lubrication episode 2 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Volume II 503 Table 3 RADIAL INTERNAL CLEARANCE SELF-ALIGNING ROLLER BEARINGS METRIC Tolerance Limits in In. Basic bore diameter mm Bearings with cylindrical bore Symbol 2a Symbol Oa normal Symbol 3a Symbol 4a Over Incl. Low High Low High Low High Low High 14 24 4 8 8 14 14 IX 18 24 24 30 6 10 10 16 16 22 22 28 30 40 6 12 12 18 18 24 24 32 40 50 8 14 14 22 22 30 30 39 50 65 10 17 17 26 26 36 36 47 65 xo 12 20 20 32 32 44 44 57 SO 100 14 25 25 39 39 53 53 71 100 120 17 31 31 48 48 64 64 83 120 140 20 38 38 57 57 75 75 95 140 160 24 43 43 65 65 87 87 1 10 160 180 26 47 47 71 71 95 95 122 l 80 200 28 51 51 79 79 103 103 133 200 225 32 55 55 87 87 114 114 149 225 250 36 59 59 95 95 126 126 165 250 280 39 67 67 103 103 13X 13X 180 2X0 315 44 75 75 110 110 145 145 197 315 355 47 79 79 122 122 161 161 216 355 400 51 87 87 134 134 177 177 236 400 450 55 95 95 145 145 197 197 260 450 500 55 103 103 162 162 216 216 284 500 560 59 110 1 10 173 173 236 236 307 560 630 67 122 122 1X9 1X9 256 256 335 360 710 75 138 138 209 209 276 276 362 710 800 83 153 153 228 228 303 303 397 xoo 900 91 169 169 256 256 33X 338 440 900 1000 103 188 188 2X0 2X0 365 365 480 Note Tolerance limits for radial internal clearance in self-aligning roller bearings under no load. This table applies to bearings conforming to the Basic Plan for Boundary Dimensions of Metric Radial Bearings AFBMA Siandards Section 2 Table 1. a These symbols relate to the AFBMA Standard Section 5 identification code. Strength Cyclic contract stresses may vary from 700 to 2800 MPa 100 000 to over 400 000 psi in operation and shock loads may range to 4100 MPa 600 000 psi . Fatigue life is inversely proportional to the 7th to 10th power of the stress under the most heavily loaded rolling element. Maximum hardnesses are limited by material sensitivity to cracking and metallurgical stability. Due to the high-contact stress and subsurface shear stress in rolling element bearings surface or near-surface elements must be .