Flat-and Round-Belt Drives Muhannad Al_Waily_Machines Systems Design Belts and Chain Flat-and Round-Belt Drives Belts Flat Metal Belts 'V-Belts' Roller Chain Wire Rope

Flat-and Round-Belt Drives Muhannad Al_Waily_Machines Systems Design Flat-and Round-Belt Drives open-belt drive Crossed belt Forced Analysis The centrifugal force ' dS ' forces radially forces tangentially

Muhannad Al_Waily_Machines Systems Design ' Fc ' is found as follows The belt speed The weight w of a meter of belt is given in terms of the weight density Total Forces in belt

Muhannad Al_Waily_Machines Systems Design The transmitted power nominal power as ' Hd = Hnom . Ks . nd These effects are incorporated as follows For polyamide and urethane belts, use 'Cv=1 '

Muhannad Al_Waily_Machines Systems Design The steps in analysis a flat-belt drive can include Find ' exp(f.) ' from belt-drive geometry and friction From belt geometry and speed find ' Fc ' From ' T = Hnom . Ks . nd / (2.π.n) ' find necessary torque From torque ' T ' find the necessary Find ' F2 ' find the necessary initial tension ' Fi ' Check the friction development

Muhannad Al_Waily_Machines Systems Design dip (m) L = center-to-center distance (m) weight per foot of the belt (N/m)

Flat Metal Belts as thin as ' 0.05 mm ' and as narrow as ' 0.65 mm ' Muhannad Al_Waily_Machines Systems Design Flat Metal Belts as thin as ' 0.05 mm ' and as narrow as ' 0.65 mm ' A bending stress Axial stress The largest tensile stress The smallest tensile stress

The selection of a metal flat belt can consist of the following steps Muhannad Al_Waily_Machines Systems Design The selection of a metal flat belt can consist of the following steps Find ' exp(f.) ' from geometry and friction Find endurance strength Allowable tension Choose Check frictional development

Muhannad Al_Waily_Machines Systems Design 'V-Belts' Pitch length ' Lp ' and the center-to-center distance ' C '

Muhannad Al_Waily_Machines Systems Design allowable power

The centrifugal tension ' Fc ' Muhannad Al_Waily_Machines Systems Design In a V-belt the effective coefficient of friction sheave groove angles of ' 300, 340, and 380 ' The Gates Rubber Company declares its effective coefficient of friction to be ' 0.5123 ' for grooves The design power The centrifugal tension ' Fc '

Muhannad Al_Waily_Machines Systems Design These equivalent tensions are added to ' F1 '

Muhannad Al_Waily_Machines Systems Design Roller Chain The chain velocity ' V ' number of sprocket teeth chain pitch, m sprocket speed, rev/s The maximum exit velocity of the chain the minimum exit velocity

Muhannad Al_Waily_Machines Systems Design the speed variation

'American Chain Association (ACA)' Muhannad Al_Waily_Machines Systems Design 'American Chain Association (ACA)' the nominal power ' H1 ', link-plate limited the nominal power ' H2 ', roller-limited number of teeth in the smaller sprocket sprocket speed, rev/min pitch of the chain, mm ( 29 ) for chain number ' 25, 35 '; ( 3.4 ) for chain ' 41 '; and ( 17 ) for chains ' 40-240 ' The constant ( 0.003 ) becomes ( 0.00165 ) for no. ' 41 ' lightweight chain The allowable power ' Ha '

Muhannad Al_Waily_Machines Systems Design

Muhannad Al_Waily_Machines Systems Design

Muhannad Al_Waily_Machines Systems Design The approximate length of the chain ' L ' in pitches The center-to-center distance ' C ‘, For a deviation The maximum speed (rev/min) for a chain drive is limited by galling between the pin and the bushing

Muhannad Al_Waily_Machines Systems Design Wire Rope the radius of curvature '  ', we can substitute the sheave radius 'D/2'

Muhannad Al_Waily_Machines Systems Design 'bearing pressure' The graph does show that the rope will have a long life if the ratio ' p/Su ' is less than (0.001) The factor of safety in fatigue Some guidance in strength of individual wires Improved plow steel (monitor) Plow steel Mild plow steel

Muhannad Al_Waily_Machines Systems Design The wire rope tension ' Ft ' due to load and acceleration/deceleration is weight at the end of the rope (cage and load), N number of wire ropes supporting the load weight/foot of the wire rope, N/m suspended length of rope, m maximum acceleration/deceleration experienced, m/s2 The static factor of safety ' ns '