The most important kinematic chains are those which consist of four lower pairs, each pair being a sliding pair or a turning pair 1. Four bar chain or.

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Presentation transcript:

Kinematics inversions of 4 bar and slide crank chain & Kinematics analysis in simple mechanisms

The most important kinematic chains are those which consist of four lower pairs, each pair being a sliding pair or a turning pair 1. Four bar chain or quadric cyclic chain, 2. Single slider crank chain, and 3. Double slider crank chain.

Four Bar Chain or Quadric Cycle Chain 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.

Inversions of Four Bar Chain Beam engine (crank and lever mechanism) 2. Coupling rod of a locomotive (Double crank mechanism) 3. Watt’s indicator mechanism (Double lever mechanism)

Coupling rod of a locomotive (Double crank mechanism)

Watt’s indicator mechanism (Double lever mechanism)

Single Slider Crank Chain

Inversions of Single Slider Crank Chain Pendulum pump or Bull engine 2. Oscillating cylinder engine 3. Rotary internal combustion engine or Gnome engine Crank and slotted lever quick return motion mechanism. 5. Whitworth quick return motion mechanism.

Pendulum pump or Bull engine

Oscillating cylinder engine

Rotary internal combustion engine or Gnome engine

Crank and slotted lever quick return motion mechanism

Whitworth quick return motion mechanism

Double Slider Crank Chain Elliptical trammels Scotch yoke mechanism Oldham’s coupling

Elliptical trammels

Scotch yoke mechanism

Oldham’s coupling