This document describes a mini project on the mechanics of machines focusing on inversions of the four bar linkage mechanism. It was submitted by 5 students to their professor T.Karthick in April 2018. The document discusses the four bar linkage mechanism and three important inversions: the beam engine, Watt's indicator method, and the coupling rod of a locomotive. For the locomotive coupling rod inversion, it explains that it is a four link mechanism meant for transmitting rotary motion from one wheel to the other.

2. MINI PROJECT
SUBJECT MACHANICS OF MACHINES
SUBJECT CODE U15AUT402
TOPIC INVERSION OF FOUR BAR CHAIN MECHANISM-
COUPLE ROD OF LOCOMOTIVE
GROUP NO 04
DEPARTMENT AUTOMOBILE
YEAR 2nd year(2016-2020)
GROUP MEMBERS 1.MONISH DEEPAK(16BAU019)
2.KARTHIKEYAN(16BAU020)
3.VIJAY SARATHY(16BAU021)
4.N.ARUN KUMAR(16BAU022)
5.M.MOHAMMED NOWFER(16BAU023)
DATE 27/04/2018
SUBMITTED TO…., T.KARTHICK SIR

3. FOUR BAR CHAIN MECHANISM
1. The simplest and the basic
kinematic chain is a four bar chain.
2. It consists of four links,
each of them forms a turning pair
at A, B, C and D. The four links may
be of different lengths.
3. According to Grashof ’s law for a four bar mechanism, the sum of
the shortest and longest link lengths should not be greater than the
sum of the remaining two link lengths if there is to be continuous
relative motion between the two links.

4. INVERSIONS OF FOUR BAR CHAIN
∞M a n y i n v e r s i o n o f f o u r b a r c h a i n i s
t h e r e . B u t i m p o r t a n t s a r e . ,
 BEAM ENGINE
COUPLE ROD OF LOCOMOTIVE
WATT’S INDICATOR

5. BEAM ENGINE
1. A part of the mechanism of a beam engine (also
known as crank and lever mechanism) which
consists of four links.
2. The purpose of this mechanism is to convert rotary
motion into reciprocating motion.

6. WATT’S INDICATOR METHOD
1. A *Watt’s indicator mechanism (also known as Watt's straight line
mechanism or double lever mechanism) which consists of four
LINKS
2. The initial position of the mechanism is shown in Fig. 5.21 by full
lines whereas the dotted lines show the position of the mechanism
when the gas or steam pressure acts on the indicator plunger

7. COUPLING ROD OF LOCOMOTIVE
1. The mechanism of a coupling rod of a locomotive
(also known as double crank mechanism) which
consists of four links
2. This mechanism is meant for transmitting rotary
motion from one wheel to the other wheel.

8. COUPLING ROD OF LOCOMOTIVE

9. APPLICATON