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CHARACTERISTICS OF AN ARTICULATED RHOMBIC PRISM PISTON:
   DRASTIC REDUCTION OF VIBRATION 

vittorio.scialla@strumentiperleaziende.com
3. An articulated rhombic piston does not generate linear vibration, since its main moving masses are balanced by equivalent masses in opposite motion (•).
A four-piston engine does not generate significant torque vibration, since vibration produced by each piston are substantially annulled by opposite vibration produced by the opposite piston (•).
The stroke length of an articulated rhombic piston is 160% that of a cylindrical piston of equal displacement; however, since it is equally shared by two opposed cranks, the effective stroke length of each crank is about 80% that of the crank of a cylindrical piston of equal displacement:
  • at the same power output (i.e. at half rotational speed) acceleration of moving masses are reduced by 80%;
  • at the same rotational speed (i.e. double power output) accelerations are anyway reduced by 20%.

Accelerations at the same output power
(at half the rotational speed)

Accelerations at the same rotational speed
(at double output power)
                  • = Cylindrical piston         • = Articulater rhombic prism piston

ADVANTAGES

Improved
performance
Improved
efficiency 
Cost
reduction
Lower
vibration/
noise
Longer
durability
Higher
reliability
Note
   **    ***  **  **
  • drastic reduction of vibration,
  • reduction of vibration power loss,
  • improved durability and reliability
    ***
Reduction of dampers and noise insulations		       Substantial simplification of vibration damping and noise insulation
   
**
       No rotating counterweights are needed