tailieunhanh - Bearing Design in Machinery Episode 3 Part 3

Tham khảo tài liệu 'bearing design in machinery episode 3 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table 13-12 Recommendations for Shaft Tolerances Selection of Solid Steel Shaft Tolerance Classification for Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1 RBEC-1 Except Tapered Roller Bearings From SKF 1992 with permission Conditions Examples Shaft diameter mm ball bearings1 Cylindrical roller bearing Spherical roller bearings Tolerance symbol Rotating inner ring load or direction of loading indeterminate Light loads Conveyors lightly 18 to 100 40 j6 loaded gearbox 100 to 140 40 to 100 k6 bearings Normal loads Bearing applications 18 j5 generally 18 to 100 40 40 k5 k6 2 electric motors 100 to 140 40 to 100 40 to 65 m5 m6 2 turbines pumps 140 to 200 100 to 140 65 to 100 m6 internal combustion 200 to 280 140 to 200 100 to 140 n6 engines gearing 200 to 400 140 to 280 p6 woodworking machines 280 to 500 r6 500 r7 Heavy loads Axleboxes for heavy 50 to 140 50 to 100 n63 railway vehicles 140 to 200 100 to 140 p63 traction motors 200 140 r63 rolling mills Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. High demands on running Machine tools 18 h54 accuracy with light loads 18 to 100 40 j54 100 to 200 40 to 140 k54 140 to 200 m54 Stationary inner ring load Easy axial displacement of Wheels on all all all g6 inner ring on shaft desirable non-rotating axles Easy axial displacement of Tension pulleys all all all h6 inner ring on shaft rope sheaves unnecessary Axial loads only Bearing applications all all all j6 of all kinds Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. Table 13-13 Recommendations for Housing Tolerances From SKF 1992 with permission Conditions Examples Tolerence symbol Displacement of outer ring SOLID HOUSINGS Rotating outer ring load Heavy loads on bearings in Roller bearing wheel hubs P7 Cannot be displaced thin-walled housings heavy shock loads big-end bearings Normal loads and heavy loads Ball bearing wheel hubs big-end N7 Cannot be displaced bearings crane travelling wheels Light and variable loads Conveyor rollers