# US 5,704,332 A · Rotary engine

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- Number: US 5,704,332 A
- Document ID: US5704332A
- Status: Granted
- Kind: A
- Application number: 08/622,825
- Filed: 1996-03-27
- Granted: 1998-01-06
- Earliest claimed: 1996-03-27
- Inventors: Ardeshir Motakef
- Web page: https://patentgrep.com/patent/US5704332A

## CPC

- F01B 13/06: in star arrangement
- F01B 9/06: the piston motion being transmitted by curved surfaces
- F01C 1/44: with vanes hinged to the inner member
- F02B 53/00: Internal-combustion aspects of rotary-piston or oscillating-piston engines (internal-combustion aspects of rotary pistons or outer members for co-operation therewith F02B55/00)
- 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)
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

An internal combustion engine in which linear, reciprocating motion of pistons is translated to rotary motion of a cylinder. In another embodiment, the pistons are in the form of V-shaped blades which bear against a camming surface to rotate an outer housing relative to an inner stator. Applications of this engine include use in tunnelling and well-drilling machines, pump motor for centrifugal and radial vane pumps, locomotives, marine propulsion, aircraft including piloted aircraft, and heavy machinery.

## Claims

### Claim 1

A rotary engine comprising:
a central rotor having a peripheral cam surface, said cam surface having a plurality of radially extending noses, each of said noses having a generally concave leading cam surface and a generally convex trailing surface, said central rotor having a central output shaft;
an annular stator positioned radially outwardly of and concentric with said rotor, said stator having an annular wall and a plurality of V-shaped blades pivotally mounted in said wall;
each of said blades including a radially inner plate having an end surface shaped to engage said cam surface, a radially outer plate, and a cylindrical pivot body positioned at a vertex of said blades said body having a passageway connecting an outer surface of said outer plate to an outer surface of said inner plate, said passageway having a valve oriented to prevent fluid flow from said inner plate to said outer plate;
said annular wall having a plurality of wedge-shaped chambers positioned such that each of said chambers encloses one of said outer plates, said chamber having an outer wall with an air inlet port and a check valve in said port which prevents fluid flow out of said chamber, and a plurality of concave combustion surfaces, each of said combustion surfaces being positioned adjacent to one of said chambers and to one of said inner plates and including a spark plug;
an outer cylinder shaped to enclose said stator and rotor;
a pair of end plates mounted on said outer cylinder, one of said end plates including air intake ports for supplying air and fuel to said chambers;
whereby rotation of said rotor relative to said stator causes said cam surface to bear against said end of said V-shaped blade and pivot said blade relative to said stator, thereby causing said outer plate to compress a fuel air mixture in said chamber and force said compressed mixture through said channels to a space between said inner plate and said combustion surface where said mixture is ignited by said spark plug, thereby forcing said V-blade to pivot against said convex trailing cam surface and rotate said rotor relative to said stator.

### Claim 2 (depends on 1)

The rotary engine of claim 1 further comprising an ignition switch for actuating said spark plug, said switch being mounted on said stator and positioned to contact said nose of said cam surface.

### Claim 3 (depends on 1)

The rotary engine of claim 1 wherein said pivot bodies are journaled into said end plates, said end plates including upper and lower end caps, and said valves including each of said end caps having passages positioned to communicate with said passageways in said pivot body to allow a fuel-air mixture to enter said combustion chamber, then said pivot body passageway pivots out of communication with said end cap passageway as said blade pivots in response to ignition of said fuel-air mixture in said combustion chamber.

### Claim 4 (depends on 3)

The rotary engine of claim 3 wherein said pivot bodies are oriented parallel to a central axis of said rotor.

### Claim 5 (depends on 4)

The rotary engine of claim 4 wherein said inner plate is shaped to cover and seal against said combustion surface.