# US 2019/0376448 A1 · Balanced rotary engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376448 A1 - Document ID: US20190376448A1 - Status: Published application - Kind: A1 - Application number: 16/412,344 - Filed: 2019-05-14 - Published: 2019-12-12 - Earliest claimed: 2016-10-21 - Inventors: Michel ARSENEAU - Web page: https://patentgrep.com/patent/US20190376448A1 ## CPC - F02B 75/26: Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis - F01B 3/0023: {Actuating or actuated elements} - F01B 9/02: with crankshaft - F02B 75/065: {with double connecting rods or crankshafts} - F02B 75/16: Engines characterised by number of cylinders, e.g. single-cylinder engines (F02B75/26 takes precedence) - F02B 75/32: Engines characterised by connections between pistons and main shafts and not specific to preceding main groups - F16F 15/24: of crankshaft systems by particular disposition of cranks, pistons, or the like {(shape of crankshafts or eccentric-shafts having regard to balancing F16C3/20)} - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F01B: MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotary-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion engines F02B; combustion-product engine plants F02G; machines or engines, other than of positive-displacement type, for liquids F03B; positive-displacement engines driven by liquids F03C; wind motors F03D; positive-displacement machines for liquids F04B; rotary-piston, or oscillating-piston, positive-displacement machines for liquids F04C) - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract A balanced rotary engine for applying torque to a drive shaft. The engine has an outer casing with a main drive case. A cylinder is rotably mounted in the casing and a piston is mounted to move longitudinally within the cylinder. Two connecting arms, each with a connecting end, one of the ends is connected to the piston, and two crankshafts, each one being rotably connected to the other connecting end of the connecting arms. Two drive wheels are contra-rotably connected to the respective first and second crankshafts. A fixed drive ring has a circumferentially disposed drive member surface. The fixed drive ring is mounted in the case so that the drive member surface faces the piston. The two drive wheels mesh with the drive ring. ## Claims ### Claim 1 A balanced rotary engine for applying torque to a drive shaft, the rotary engine comprising: an outer casing having a main drive case; a cylinder rotably mounted in the outer casing; a piston mounted for longitudinal movement within the cylinder; a drive assembly having: i) a first connecting arm and a second connecting arm, each connecting arm having a first connecting end and a second connecting end, the first connecting ends being connected to the piston; ii) a first crankshaft and a second crankshaft, each crankshaft being rotably connected to the second connecting end of the connecting arms; iii) a first drive wheel and a second drive wheel contra-rotably connected to the respective first and second crankshafts; and iv) a fixed drive ring having a circumferentially disposed drive member surface, the fixed drive ring being mounted in the main drive case so that the drive member surface is disposed towards the piston, the first and second drive wheels meshing with the drive ring; the drive shaft being connected to the drive assembly and extending away therefrom. ### Claim 2 (canceled) ### Claim 3 (depends on 1) The rotary engine, according to claim 1, in which the cylinder has a chamber with a first longitudinal axis and a cylinder base, the cylinder base having first and second semi-circular indents located opposite each other, the cylinder base being sized and shaped for cooperation with the drive assembly. ### Claim 4 (depends on 1) The rotary engine, according to claim 1, in which the first and second drive wheels are mounted for contra-rotation about a second axis of rotation, the second axis of rotation being disposed orthogonal to the first axis of rotation. ### Claim 5 (depends on 3) The rotary engine, according to claim 3, in which the cylinder has a cylinder circumference, and the cylinder base having a cylinder base circumference, the cylinder base circumference being greater than the cylinder circumference ### Claim 6 (depends on 1) The rotary engine, according to claim 1, in which the first and second drive wheels are first and second gear pinions each having a plurality of circumferentially disposed teeth, each of the gear pinions are beveled towards each other. ### Claim 7 (depends on 6) The rotary engine, according to claim 6, in which the fixed drive ring has a plurality of circumferentially disposed inwardly beveled teeth, the beveled teeth of the gear pinions and the fixed drive ring being cooperable for meshing during contra-rotation of the gear pinions. ### Claim 8 (depends on 1) The rotary engine, according to claim 1, in which the first and second crank shafts each have a throw for connecting the crank shaft to the connecting arm, and a curvature located away from the throw. ### Claim 9 (depends on 1) The rotary engine, according to claim 1, in which a piston pin connects the first connecting ends of the connecting arms to the piston, the piston pin being disposed orthogonal to a cylinder opening first longitudinal axis. ### Claim 10 (depends on 1) The rotary engine, according to claim 1, in which the piston, the connecting arms and the crankshafts are triangulated when the piston is located in the cylinder at mid stroke so as to balance the engine. ### Claim 11 (depends on 1) The rotary engine, according to claim 1, in which an arm spacer is located between the first and second connecting arms, the spacer extending from between the connecting arms to between the first and second crankshafts. ### Claim 12 (depends on 1) The rotary engine, according to claim 1, in which a first crankshaft bearing is connected to both the first crankshaft and the first gear pinion, the first crankshaft bearing being located therebetween; and a second crankshaft bearing is connected between the second crankshaft and the second gear pinion and located therebetween. ### Claim 13 (depends on 12) The rotary engine, according to claim 12, in which the first and second gear pinions are secured to the first and second crankshaft bearings and to the second arm connecting end of the first and the second connecting arms using crank gear bolts. ### Claim 14 (depends on 1) The rotary engine, according to claim 1, in which a cylinder bearing is connected between the cylinder and the outer casing, the cylinder being sealingly connected to the outer casing. ### Claim 15 (depends on 1) The rotary engine, according to claim 1, in which the outer casing includes a base body and a mid section body, the base body having a base body opening, the drive shaft being sealingly connected to the base body opening. ### Claim 16 (depends on 15) The rotary engine, according to claim 15, in which drive shaft bearings are located between the drive shaft and the base body. ### Claim 17 (depends on 1) The rotary engine, according to claim 1, further comprises: a cylinder head having located therein at least one inlet port, at least one outlet port, and an ignition source port, the cylinder head being connected to an upper portion of the cylinder for rotatable movement therewith; and a cylinder rotary disc sealingly connected to the cylinder head and the upper portion of the cylinder, the cylinder rotary disc being located therebetween. ### Claim 18 (depends on 17) The rotary engine, according to claim 17, in which the cylinder rotary disc includes a cylinder rotary disc opening, and a cylinder rotary disc ignition source port, the ports in the cylinder head being sequentially registered with the cylinder rotary disc opening as the cylinder rotates within the outer casing. ### Claim 19 (depends on 16) The rotary engine, according to claim 16, in which an underside of the cylinder head includes first and second seal rings circumferentially spaced apart and concentric with the ignition source port for sealingly mounting with the cylinder; and at least two seal rings are mounted in corresponding seal grooves located around the inlet port and the outlet port in the cylinder head, the seal rings being eccentrically located relative to the cylinder head. ### Claim 20 (depends on 19) The rotary engine, according to claim 19, in which a plurality of wave springs are connected to the cylinder rotary disc and the cylinder head. ### Claim 21 A balanced rotary engine for applying torque to a drive shaft, the rotary engine comprising: first and second connecting arms, each connecting arm having a first connecting end and a second connecting end, the first connecting ends being located for connection to a piston piston; first and second crankshafts, each crankshaft being rotably connected to the second connecting end of the connecting arms; first and second drive wheels contra-rotably connected to the respective first and second crankshafts; and a fixed drive ring having a circumferentially disposed drive member surface, the fixed drive ring being mounted in the main drive case so that the drive member surface is disposed towards the piston, the first and second drive wheels meshing with the drive ring.