| Patents for F02B 71 - Free-piston engines; Engines without rotary main shaft (1,404) |
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| 03/03/2015 | US8967098 Single-cylinder, dual head internal combustion engine having magnetically coupled power delivery |
| 02/26/2015 | DE112013002696T5 Motor mit innerer Verbrennung und Verfahren zum Betreiben eines Motors mit innerer Verbrennung Internal combustion engine and method of operating an internal combustion engine |
| 02/04/2015 | CN104329165A 一种两缸四冲程液压自由活塞发动机 A two-cylinder, four-stroke hydraulic free piston engine |
| 02/04/2015 | CN104329164A 一种自由活塞发动机 A free-piston engine |
| 01/28/2015 | CN204126725U 一种液压发动机 A hydraulic engine |
| 01/28/2015 | CN104314681A 一种液压发动机 A hydraulic engine |
| 01/21/2015 | CN102748131B 无死态自由活塞发动机 No dead-state free-piston engine |
| 01/20/2015 | US8936003 Piston |
| 01/14/2015 | CN204099053U 自由活塞压气机 Free piston compressor |
| 01/14/2015 | CN204099052U 双液压泵发动机 Dual hydraulic engine |
| 01/01/2015 | US20150001852 Linear Electrical Machine |
| 12/10/2014 | CN204003096U 复合自由活塞式直线发电机 Composite free-piston linear generator |
| 12/10/2014 | CN204003095U 并排对称自由活塞永磁直线发电机 Permanent magnet linear generator free piston side symmetry |
| 12/10/2014 | CN104196623A 一种具有双级活塞的自然吸气式自由活塞内燃发电机 Having a two-stage piston naturally aspirated free piston internal combustion generator |
| 12/10/2014 | CN104196621A 一种水平对置式发电型内燃机结构 A horizontal opposed type internal combustion engine power generation structure |
| 12/02/2014 | US8899192 Methods and systems for managing a clearance gap in a piston engine |
| 11/18/2014 | US8887690 Ammonia fueled mobile and stationary systems and methods |
| 10/07/2014 | US8851029 Opposed-piston cylinder bore constructions with solid lubrication in the top ring reversal zones |
| 10/07/2014 | US8850794 Pulse detonation engine |
| 10/02/2014 | US20140290956 High pressure pump |
| 09/25/2014 | US20140283791 Free-piston engine |
| 09/12/2014 | WO2014135200A1 Combustion engine comprising a linear generator and a return spring |
| 09/11/2014 | DE102013104685B3 Freikolbenvorrichtung Free-piston device |
| 08/07/2014 | US20140216411 Linear alternator assembly with four-stroke working cycle and vehicle having same |
| 08/07/2014 | DE102014101274A1 Lineargeneratorbaugruppe mit Viertaktarbeitszyklus und Fahrzeug mit derselben Linear generator assembly with four-stroke cycle and car with the same |
| 08/06/2014 | CN103967645A 一种自由活塞式发动机的活塞挡圈 A free-piston engine piston retaining ring |
| 08/06/2014 | CN103967605A 一种控制驱动器伺服系统的方法 A method of controlling the drive servo system |
| 08/06/2014 | CN103967604A 一种自由活塞式发动机 A free-piston engine |
| 08/05/2014 | US8794198 Free piston engine |
| 07/16/2014 | CN102374021B 自由活塞发动机 Free piston engine |
| 07/09/2014 | CN103912378A 双双并排自由活塞永磁直线发电机 Both side of the free piston permanent magnet linear generator |
| 07/09/2014 | CN102482994B 具有支承活塞的磁力支承的活塞机 Magnetic piston having a bearing supported piston machine |
| 07/08/2014 | CA2637634C System and method for electrically-coupled thermal cycle |
| 06/25/2014 | CN203670001U 一种带有预加热装置且结合催化的微自由活塞发电机 A pre-heating means and the combination of micro-catalyzed with a free-piston generators |
| 06/19/2014 | US20140165967 Internal combustion engines |
| 06/18/2014 | EP2742221A2 A piston of a free piston engine generator |
| 06/17/2014 | CA2772845C Piston engine having magnetic piston bearing |
| 06/12/2014 | DE102012001827A1 Propulsion system for aircraft, has holding mechanisms consisting of ball spring locks and huge springs, which hold running piston on linkage rod during operation of prime mover and then slide in direction of bottom dead center |
| 05/28/2014 | CN103827465A 自由活塞式发动机驱动型发电机的活塞 Free-piston engine-driven generator piston |
| 05/20/2014 | US8729718 Thermomagnetic generator |
| 05/20/2014 | US8726857 System and method for electrically-coupled heat engine and thermal cycle |
| 05/15/2014 | US20140130771 High-efficiency linear combustion engine |
| 05/08/2014 | DE102010008226A1 Free-piston engine i.e. Otto engine, has heat exchange chamber surrounding combustion chamber between walls of working cylinder and cylinder head, and inlet valve connected with combustion chamber, overflow channel or exchange chamber |
| 05/08/2014 | DE102009040051B4 Freikolbenmaschine mit magnetischer Lagerung des Kolbens Free-piston engine with a magnetic bearing of the piston |
| 05/06/2014 | US8716877 Method and apparatus for harvesting energy from ankle motion |
| 05/06/2014 | US8714117 Free piston linear alternator utilizing opposed pistons with spring return |
| 05/01/2014 | WO2014064475A1 Electromechanical automobile and tractor drive with multifunctional smooth running system |
| 05/01/2014 | US20140116389 Single-cylinder, dual head internal combustion engine having magnetically coupled power delivery |
| 04/30/2014 | CN203570425U Working mode switching device of free piston linear motor |
| 04/30/2014 | CN103758637A Self-balancing high-speed free piston generator |
| 04/24/2014 | WO2014059743A1 Microcomputer controlled internal combustion engine without crankshaft and with check valves cooperating with piston to accumulate energy |
| 04/17/2014 | WO2014057227A1 Heat engine for driving a drive shaft |
| 04/09/2014 | CN103711581A Catalyzing combination micro free piston generator with preheating device |
| 03/26/2014 | CN103670696A Four-stroke engine free of crank shaft and valve |
| 03/19/2014 | CN103644027A Hydraulic transmission engine and hydraulic drive car |
| 03/18/2014 | US8671681 Opposed piston internal combustion engine and method of operation thereof |
| 03/06/2014 | WO2013179054A3 An internal combustion engine and a method of operating an internal combustion engine |
| 03/05/2014 | CN103615315A Balance mechanism of double-module free piston internal combustion engine generator |
| 03/04/2014 | US8662029 High-efficiency linear combustion engine |
| 02/27/2014 | WO2013108034A3 A linear electrical machine |
| 02/19/2014 | CN103590899A Oppositely-arranged four stroke free piston internal combustion-linear electricity generating integrated device |
| 02/19/2014 | CN103590898A Device for switching operating modes of free piston linear motor |
| 02/19/2014 | CN103590897A Free-piston engine |
| 02/13/2014 | DE102012111067B3 Free-piston device has primary and secondary piston portions which move relative to each other under effect of expansion of working fluid in the expansion space and under action of return spring arranged in spring-back space |
| 02/13/2014 | DE102011017248A1 Free piston machine e.g. petrol engine has combustion chamber that is connected with connecting/closing off intake valve in heat exchange space, and piston chamber that is connected with connecting/closing off non-return valve |
| 02/12/2014 | CN103573407A Self-balancing free-piston internal-combustion generator |
| 02/12/2014 | CN103573406A Double-cylinder opposed free-piston internal combustion engine generator |
| 01/08/2014 | EP2682584A1 Hydraulic engine |
| 12/31/2013 | US8616162 Opposed free piston linear alternator |
| 12/11/2013 | CN102216578B Method for purging a dosing system |
| 12/10/2013 | US8601988 Free piston assembly and method for controlling a free piston assembly |
| 12/10/2013 | US8601685 Method of retrofitting an engine |
| 12/05/2013 | WO2013179054A2 An internal combustion engine and a method of operating an internal combustion engine |
| 12/03/2013 | US8596230 Hydraulic internal combustion engines |
| 11/26/2013 | US8590496 System including an electromagnetically energized piston motor designed to convert chemical and electrical energy to mechanical energy |
| 11/14/2013 | US20130298874 Methods and systems for free piston engine control |
| 11/14/2013 | DE112012000915T5 Freikolbengenerator Free-piston generator |
| 10/24/2013 | DE102011000620B4 Freikolbenvorrichtung und Verfahren zum Betreiben einer Freikolbenvorrichtung Free-piston device and method of operating a free-piston device |
| 10/23/2013 | EP2652287A1 Internal combustion engine of the annular piston type and a center shaft for such an engine |
| 10/08/2013 | US8549854 EGR constructions for opposed-piston engines |
| 10/02/2013 | EP2643573A1 High-efficiency linear combustion engine |
| 09/26/2013 | US20130247877 Free-Piston Engine for Generating Combined Heat and Power |
| 09/24/2013 | CA2629698C Fuel supply and combustion chamber systems for fastener-driving tools |
| 09/18/2013 | CN103306810A Microcomputer-controlled one-way valve-matched piston pressure-storing crankless internal-combustion engine |
| 09/18/2013 | CN102434277B Internal-combustion permanent-magnet linear power generation device |
| 09/11/2013 | CN103299046A High-efficiency linear combustion engine |
| 08/21/2013 | CN103261626A Free piston engine generator |
| 08/20/2013 | US8513824 Suspension system for vehicle |
| 08/20/2013 | US8511264 Fuel supply and combustion chamber systems for fastener-driving tools |
| 08/07/2013 | CN103233813A Ignition-starting-type compression-ignition-type free piston internal combustion power generation power system |
| 07/24/2013 | CN103217180A Position sensor of free piston engine |
| 07/24/2013 | CN103216322A Free piston type engine |
| 07/24/2013 | CN103216321A Atomizing lubricating free piston-type engine |
| 07/17/2013 | CN203067088U Non-halted-state free piston engine |
| 07/17/2013 | CN103206304A Air intake system for free piston engine with opposed pistons and opposed cylinders |
| 07/16/2013 | US8485146 Engine device |
| 07/11/2013 | WO2013019446A3 Digital hydraulic opposed free piston engines and methods |
| 07/10/2013 | EP2612007A1 Free-piston engine with linear power generator |
| 07/10/2013 | CN103195564A Free piston type engine and starting method thereof |
| 07/10/2013 | CN103195563A Fuel injector for free piston type engine |