A double -piston engine, an internal combustion engine is known, in which two co-rotating working pistons have a common combustion chamber. The uniflow scavenging used in this case allowed as the only variant in the two-stroke engine, the supercharging of the engine, since the outlet may be earlier than the inlet closed. The double piston engine was built from 1913 to 1970 mainly in motorcycles.

Technology and application

In the double- piston motor with fork or Anlenkpleuel a piston controls the exhaust process, the other the Überströmvorgang. One distinguishes the double piston engine three types:

  • The Gabelpleuel keeps the pistons in a row ( system Puch)
  • The Gabelpleuel keeps the pistons side by side ( system Triumph)
  • The main and auxiliary connecting rod ( Anlenkpleuel ) after the patent of Arnold Zoller

Manufacturers in motorcycles

  • Alberto Garelli (1913-1926)
  • Puch; developed by Giovanni Marcellino running piston in succession (1923-1970)
  • Baier; after the patent of Arnold Zoller (1927-1929)
  • DKW ( with supercharged piston pump); after the patent of Arnold Zoller ( 1933 - )
  • Triumph; the pistons run side by side (1939/1946-1957)

Manufacturers in car

  • Trojan Limited ( 1913)
  • Zoller ( 1934)

Manufacturers in truck

  • Framo motor U 500, goes back to designer Petersen of DKW. Installed in 1943-1951 Framo type V 501