# US 2018/0023508 A1 · Two Cylinder Double Acting Stirling Engine

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- Number: US 2018/0023508 A1
- Document ID: US20180023508A1
- Status: Published application
- Kind: A1
- Application number: 15/217,929
- Filed: 2016-07-22
- Published: 2018-01-25
- Earliest claimed: 2016-07-22
- Inventors: Ali Javaherpour
- Web page: https://patentgrep.com/patent/US20180023508A1

## CPC

- F02G 1/044: having at least two working members, e.g. pistons, delivering power output
- F02G 2244/54: having two-cylinder twin systems, with compression in one cylinder and expansion in the other cylinder for each of the twin systems, e.g. "Finkelstein" engines
- F02G 2270/40: Piston assemblies
- F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR

## Abstract

A thermodynamic machine designed as a two cylinder engine, working as a double acting Stirling engine. This new model of Stirling engine consists of two cylinders and three pistons of equal diameter. Pistons reciprocate in cylinders, move gas and run Stirling cycle. The gas in each cylinder is transferred to the other cylinder through pipes and the gas is displaced between hot end of engine and cold end of engine by means of these pipes. Each cylinder contains a hot end or a hot zone and a cold end or a cold zone. Thereby there are two Stirling cycles operating simultaneously but with phase offset in this engine.

## Claims

### Claim at position 1

1- A two cylinder double acting Stirling engine, comprises three pistons, a first piston reciprocating in a first cylinder and second and third pistons reciprocating in a second cylinder; wherein a first pipe extends from an expansion chamber of said first cylinder and is connected on another end to a compression chamber of said second cylinder and vice versa, a second pipe extends on one end from an expansion chamber of said second cylinder and is connected on another end to a compression chamber of said first cylinder; wherein said first piston in said first cylinder reciprocates with a 90° phase offset in comparison with said second and third pistons of said second cylinder; and wherein there is no phase offset between said second and third pistons.

### Claim at position 2 (depends on 1)

2- The Stirling engine of claim 1, wherein said first, second and third pistons have equal diameters but different structures, and wherein said first and second cylinders are similar in bore diameter but different in structure.

### Claim at position 3 (depends on 2)

3- The Stirling engine of claim 2, wherein said second cylinder further comprises of a cylinder upper body, lower body, cylinder separator wall located at a middle of said second cylinder, wherein said second piston is located at an upper half of said second cylinder above said wall and wherein said third piston is located at a bottom half of said second cylinder below said wall creating said second compression chamber.

### Claim at position 4 (depends on 3)

4- The Stirling engine of claim 3, wherein said second and third pistons are connected to each other via a rigid push rod, which is passed through said separator wall.