Four-Bar Linkage

Fourbar linkage simulator

a = 35

$\theta_2$= 60

b = 70

f = 80

$\phi$= 30

c = 75

d = 50

$\theta_1$= 0

configuration (open or cross)
the coupler curve (trajectory of point P). Scale link lengths by or by

Variable	Value	Units
$\theta_3$		degrees
$\theta_4$		degrees

Crank slider linkage simulator

a= 20

$\theta_2$= 30

b= 70

c= 30

configuration (open or cross)

Variable	Value	Units
$\theta_3$		degrees
$d$		same as link lengths

Slider crank linkage simulator

a= 20

b= 70

c= 0

d = 75

configuration (open or cross)

Variable	Value	Units
$\theta_2$		degrees
$\theta_3$		same as link lengths

Inverted crank slider linkage simulator

a= 30

$\theta_2$= 60

c= 50

d= 70

$\gamma$= 90

configuration (open or cross)

Variable	Value	Units
$\theta_3$		degrees
$\theta_4$		degrees
$b$		same as link lengths

Inverted slider crank linkage simulator

a= 30

b= 30

c= 50

d= 70

$\gamma$= 90

configuration (open or cross)

Variable	Value	Units
$\theta_2$		degrees
$\theta_3$		degrees
$\theta_4$		degrees

Linkage simulators

These pages show standard linkages typically studied as part of a mechanism design and analysis course. These linkages form the building blocks of many mechanisms in the real world, such as pumpjack, door closers, hand pumps, internal combustion engines, compressors, and backhoes, to name a few.

On each page, a kinematic diagram of the linkage shows parts of the linkage with labels depicting angles and lengths. Sliders can be used to vary design parameters such as link lengths and orientations. The parameter label in red serves as the input to the mechanism and the output angles or lengths are listed in a table below the linkage.