SHAFTHUBLOCK
CALCULATION REPORT
Order : Dware
Project : Dobby
Subproject : Belt drive
Project item : Timing pulley
Shaft ID : DO-Shaft
Hub element ID : DO-Pulley
Calculated by : André Dewispelaere
Organization : Dware
Date : 01/06/2018
Mating materials
Element: ID Cl Denomination R_pN R_mN s_WbN A5 HB E nu rho
-------: --- --- -------------- N/mm² N/mm² N/mm² % HB N/mm² -- kg/dm³
Shaft : 266 VSN C45E 380 640 320 14 240 210000 0.30 7.85
Hub : 255 VSN C22E 240 420 200 20 220 210000 0.30 7.85
Key/rng: 715 GJS EN-GJS-500-7 320 500 224 7 220 169000 0.28 7.10
Input design clamp ring connect Symbol Unit Shaft Hub
Nominal torque to transmit T N.m 500.00
Nominal axial force Fa kN 0.000
Action radius axial force rFa mm 0.0
Application factor KA -- 1.25
External diameter do mm 60.0 --
Internal diameter di mm 0.0 60.0
Hub width bh mm -- 60.0
Contact surface roughness Ra µm 0.800 1.600
Tolerance Tg -- h8 P8/h8
Min safety factor on failure SFh -- -- 3.50
Clamp ring width br mm 50.0
Bolt count nb -- 1
Clamp ring tolerance ITr -- P8
Min safety factor on ring failure SFr -- 2.40
Min safety factor on slip Sr -- 1.50
Surface condition -- -- ungreased
Load case -- -- uniform
Bolt strength class -- -- 12.9
Calculation Symbol Unit Shaft Hub
Outside diameter do mm 60.0 72.0
Ring outside diameter in A dorA mm 110.0
Ring outside diameter in B dorB mm 97.0
Ring inside diameter dir mm 72.0
Bolt thread dG -- M10
Bolt force Fb N 48900
Bolt tightening torque Tb N.m 71
Lever arm of normal force l1 mm 36.0
Lever arm of bolt force l2 mm 96.0
Normal force Fn N 130400
Stick coefficient νru -- 0.140
Slip torque Tr N.m 1095
Calc safety factor on slip Sr -- 1.75
Contact pressure pFsh,hr N/mm² 36 36
Calc safety factor contact pressu SFsh,hr -- 2.22 2.22
Stress in ring at point A Symbol Unit Clamp Ring
Tangential stress σtrA N/mm² 90
Radial stress σrrA N/mm² -36
Comparison stress σvrA N/mm² 112
Calc safety factor on failure SrA -- 2.86
Stress in ring at section BB Symbol Unit Clamp Ring
Burst tensile stress σtrBB N/mm² 130
Safety factor on failure SrBB -- 2.45