US 20140290616A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2014/0290616 A1 Han (43) Pub. Date: Oct. 2, 2014 (54) ONE-STROKE INTERNAL COMBUSTION (52) U.S. Cl. ENGINE CPC ...................................... F02B53/04 (2013.01) USPC ........................................................ 123A18A (71) Applicant: Kyung Soo Han, Timonium, MD (US) (57) ABSTRACT (72) Inventor: Kyung Soo Han, Timonium, MD (US) One-stroke internal combustion engines may comprise recip (73) Assignee: DIFFERENTIAL DYNAMICS rocating pistons which are either straight or rotary. Three CORPORATION, Owings Mills, MD principles are required to make one-stroke engines work: (US) create four dedicated chambers, assign the chambers with coordinated functions, and make pistons move in unison. The (21) Appl. No.: 14/225,658 functions will be assigned only to a single stroke but an Otto cycle produces a repeating four stroke cycle. Since four func (22) Filed: Mar. 26, 2014 tions are performed simultaneously during one stroke, every O O stroke becomes a power stroke. In reality, 1-stroke engines are Related U.S. Application Data physically rearranged 4-stroke engines. Both straight and (60) Provisional application No. 61/805,584, filed on Mar. rotary 1-stroke engines can be modified to comprise opposed 27, 2013, provisional application No. 61/825,560, piston opposed cylinder (OPOC) engines. The reciprocating filed on May 21, 2013. piston output of 1-stroke pistons may be converted to con tinuously rotating output by using crankshafts with split Publication Classification bushings or newly developed Crankgears with conventional bearings. A 1-stroke engine may require only one crankshaft (51) Int. Cl. and thus may reduce the number of parts and increase the FO2B 53/04 (2006.01) specific power ratio. 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Nos. 61/805,584 pression ready for ignition, ignition ready for exhaust, intake filed Mar. 27, 2013 entitled “Reciprocating Rotary or Linear complete ready for compression and exhaust ready for intake. Engines with Dedicated Chambers for Intake and Exhaust’ and 61/825,560 entitled “Reciprocating Rotary or Straight/ 0005. A conventional two-stroke piston is shown in PRIOR ART FIG. 4. The upstroke is shown on the left and the Linear Engines with Dedicated Chambers for Intake, Com downstroke is shown on the right. During upstroke (left), pression, Ignition/Combustion, and Exhaust' by Kyung Soo there is fuel compression, ignition, the transfer port is cov Han, the contents of each of which are incorporated by ref ered, the connecting rod has pushed up on the piston and the erence as to their entire contents. valve is open allowing fuel mixture to be drawn into the TECHNICAL FIELD crankcase. During downstroke (right), the transfer port is uncovered and fuel mixture is forced into the chamber and 0002 The technical field of the invention relates to pro burned fuel is pushed out by the compressed fuel mixture, the viding an efficient internal combustion engine being a one burned fuel shown as black dots. The piston is completely stroke internal combustion engine having a coordinated cycle lowered and the connecting rod shows the crankshaft/con making every stroke a power stroke and, more particularly, to necting rod, in a down position. The output shaft is shown an efficient engine having a reciprocating piston stroke, dedi rotating counterclockwise. cated intake, compression, ignite/combustion and exhaust 0006 PRIOR ART FIG. 5 shows a conventional two chambers which share the coordinated one-stroke engine stroke engine with a turbocharger having one dedicated cycle, improved scavenging, simple sequential cycling and chamber. Air enters from the left; fuel is injected by a fuel comprising either a straight/linear, rotary or opposed piston injector. A fuel and air mixture is formed in the crankcase, fills configuration, straight/linear or rotary. the chamber, is compressed and then is ignited by the SPARK and BURNT FUEL is exhausted toward the TURBO BACKGROUND CHARGER where it is salvaged to provide further engine 0003. A reciprocating four-stroke straight piston is well power. known in the engine arts. Referring to PRIOR ART FIG. 1, 0007. The well-known Wankel rotary engine (with Otto there is shown a conventional spark plug 1 that is ignited cycle) attributed to Felix Wankel is shown in PRIOR ART during an ignition stroke. Valve 2 is an intake valve for allow FIG. 6. A shaft B is at the middle of an oblong chamber having ing fuel into chamber 9. Valve 3 is an exhaust valve for INTAKE and EXHAUST ports. The triangular rotary piston allowing exhaust which typically comprises some unburned is shown as piston A and is caused, via gearing shown, to fuel, carbon monoxide or other elements demonstrating some rotate the shaft B through INTAKE, COMPRESSION, IGNI inefficiency in combustion to exit chamber 9. This ineffi TION and EXHAUST. Two sparkplugs are shown at the right ciency is even more pronounced in two-stroke piston engines of the oblong chamber. It may be seen that when the piston A without dedicated chambers (known two-stroke engines dis is causing contents of a chamber formed proximate the spark cussed in greater detail below). A rocker arm 4 is pivoted and plugs to be compressed, ignition will cause combustion and valve lifter 6 raises pushrod 5 to lever rocker arm 4 to raise the rotary piston A will rotate the shaft B.