Lecture notes All Units for DTS (ME8651)

DESIGN OF TRANSMISSION SYSTEMS

UNIT-1

1. DESIGN PROCEDURE FOR V – BELT DRIVE
 Step 1: Selection of belt drive:

From DB: 7.58 , select the V – Belt

 Step 2 : Calculate pulley diameter,

i = (n1/n2) = (D/d)

d  small pulley dia

D  large pulley dia

N1  small pulley RPM

N2  Large pulley RPM

 Step 3 : Calculate length of Belt

From DB: 7.53 , standardize

 Step 4 : Calculate power of the belt

From DB: 7.62

[Use appropriate belt formula]
1

, Step 5 : Calculate No. of belts

From DB: 7.70

Also calculate necessary factors from the same
page itself , for the calculation.

 Step 6 : Calculate Correct Centre Distance

From DB: 7.61

 Step 7 : Dimensions of STD V – grooved pulley

From DB: 7.70 ,

Draw the diagram and write necessary
dimensions values from the tabular column




2

, 2.DESIGN PROCEDURE FOR FLAT BELT DRIVE

 Step 1 : Calculate design power

Design power = Given power x FL XFA

Where, FL = load C.F ( DB: 7.53)

FA = AOC Factor ( DB: 7.54)

 Step 2 : Select Belt Type

From, DB: 7.52

 Step 3 : Calculate Belt Rating

From, DB: 7.54

Calculate for given AOC & Velocity

 Step 4 : Calculate Belt Width

Belt Width = [D.P / Belt Rating ] in MM

 Step 5 : Calculate Belt Length

DB : 7.33  L = 2C + /2 ( D+d ) + ( D – d )2/4c

 Step 6 : Calculate Pulley Width

Add allowance width with belt width from
3