Patent ID: 6871497
Filing Date: 2005-03-29
Classification: F02B

Abstract:
1. A 4-stroke reciprocating piston engine having a supercharging piston including a cylinder block having cylinders and a crankcase formed at the base of said cylinders; a bidirectional reciprocating piston housed in said respective cylinders of said cylinder block disposed opposite thereto; an elongated hole-shaped crank drive portion formed at the middle part of said bidirectional reciprocating piston; a rotating slider slidably disposed on said crank drive portion; and a crankshaft having a crank pin to which said rotating slider is rotatably attached; and a pair of engine beds having a bearing portion of said crankshaft and being coupled with said cylinder block; and said 4-stroke reciprocating piston engine further comprising one or more sets of engine mechanisms each including: (a) two pairs of bidirectional reciprocating power pistons mounted in series at the same phase at both ends of said crankshaft having three crank pins; (b) a pair of bidirectional reciprocating supercharging pistons mounted at the middle crank pin at a phase different by 180° with respect to said two pairs of bidirectional reciprocating power pistons in order to carry out supercharging; and (c) a cylinder head on which an air intake opening portion having an air intake valve for enabling air intake into said bidirectional reciprocating supercharging piston cylinder, a pressurized air supply opening portion for supplying pressurized air from said bidirectional reciprocating supercharging piston cylinder to said bidirectional reciprocating power piston cylinder, a pressurized air intake opening portion having a pressurized air intake valve for taking pressurized air into said respective bidirectional reciprocating power piston cylinders, and an exhaust opening portion having an exhaust valve for exhausting gas from said respective bidirectional reciprocating power piston cylinders are formed.