Machine Element Design

Design of Belts and Chains

Design of Classical V-belts

Classical V belts cross sections

Design of V-belts Calculation of design horse power

Design horse power=trainsmitted horse power(given)*S.F

Selection of belt type Calculation of pulleys dimensions and center

distance Calculation of horse power rating according to

belt type Correcting the horse power rating Calculating the number of required belt rows

Table of Service factor for V-belts

Table of Service factor for V-belts(continued)

Selection of Classical V-belts cross section

Classical V-belt sheave and groove dimensions

Classical V-belt horse power rating formulas

Speed Ratio Correction Factor(Ksr)

Classical V-belts datum Length

Length Correction Factor

Arc of contact Correction Factor

Design of chains and Sprockets

Roller chain Parts

Sprocket Dimensions A Sprocket has three

diameters: Inner diameter Outer diameter Pitch diameter=P/sin(180/N)

Sprocket Parameters: Pitch(P) Number of Teeth(N)

chain parameter Chain pitch(P)

Types of Sprockets

Selection of Service factor

Design horse power=trainsmitted horse power(given)*S.F

Selection of Sprocket Type and Pitch based on horse power and speed of small sprocket

Roller Chain Dimensions(according to selected pitch)

Calculation of Center Distance and number of chain links

11 2 2 1

/ 30 50

( ) ( )/ 2 cos( ), sin ( )

2 180 2

P P

P P

C C P C

N N N N D dL L P C

C

C: center distance P: chain Pitch L:chain length N1: Number of small sprocket Teeth

N2: Number of largesprocket Teeth

dp: Pitch diameter of small sprocket

Dp: Pitch diameter of large sprocket