Animation Of Double Crank-Locomotive Mechanism

Animation Of Double Crank-Locomotive Mechanism

Introduction :

When one of the links is fixed in a kinematic chain, it
is called a mechanism. So we can obtain as many mechanisms as
the number of links in a kinematic chain by fixing, in turn,
different links in a kinematic chain.

This method of obtaining different mechanisms by fixing
different links in a kinematics chain is known as inversion
of the mechanism.

Types of inversion

1. Four bar chain or quadric cycle chain

  • Beam engine
  • Coupling rod of locomotive
  • Watt’s indicator mechanism

2. Single slider crank chain

  • Bull engine or pendulum engine
  • Oscillating cylinder engine
  • Rotary engine
  • Crank & slotted quick return
    mechanism
  • Whitworth quick return mechanism

3. Double slider crank

  • Elliptical trammels
  • Scotch yoke mechanism
  • Old-ham’s coupling

Coupling rod of locomotive

Coupling rod of a locomotive (Double crank mechanism).
The mechanism of a couplingrod of a locomotive (also known as double crank
mechanism) which consists of four links, is
shown in Fig.

In this mechanism, the links AD and
BC (having equal length) act as cranks and are
connectedto the respective wheels. The link
CD acts as a coupling rod and the link AB is fixed in
order

to maintain a constant centre to
centre distance between them. This mechanism is meant
for transmitting

rotary motion from one wheel to the
other wheel.

Diagram Of Locomotive Mechanism
Diagram Of Locomotive Mechanism

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