It is an application of Hobson’s joint for air compressors.
Input: orange shaft.
Center of the conrod head moves along an ellipse (in green).
Advantages:
- Pressure angle on piston is small.
- Small crank radius (R) gives large displacement (L) of the piston.
L = 2.R.sin(A/2)
A: angle between crank rotary axes.
Here A = 60 deg., L = 4R
Recirculating ball linear bearings for round shaft should be used for the green angular bar.
The mechanism has unstable positions when the planes created by axes of two
آی-ویدئو