Four-stroke piston engine

Claim 1

A piston engine comprising: a cylinder having an internal wall, a cylinder head, a piston reciprocatingly received in said cylinder and defining a compression space in said cylinder, at least one ignition device disposed in said compression space, an outlet channel and an outlet valve, an inlet channel in said cylinder head communicating with the cylinder through an inlet port, an end portion of said inlet channel and said inlet port being substantially coaxial with said cylinder, an inlet valve disposed substantially coaxially with the longitudinal axis of said cylinder being received in said cylinder head and closing said inlet port, means for imparting a helical rotating movement to the air unmixed with fuel around the longitudinal axis of the cylinder within said inlet channel during the intake of the air into the cylinder, the already helically flowing air flowing into the cylinder substantially turbulence free to form a cylinder of helically flowing air in the piston-swept and compression space, a nozzle carrier carried by said inlet valve being an end projecting beyond said inlet valve into the compression space, at least one nozzle means being provided on said nozzle carrier spaced inwardly of said inlet valve in said compression space and having an outlet aperture directed in a substantially outward direction relative to the longitudinal axis of the cylinder for injecting or blowing a jet of fuel into the cylinder of helically flowing air, the rotating air distintegrating the fuel jet to form a combustible air-fuel mixture surrounded by a rotating ring or cylinder of pure air and partially or completely flowing between said nozzle means and said inlet valve.