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Free-piston internal combustion engine

An internal combustion engine and piston technology, applied in the field of free-piston internal combustion engines, can solve the problems of reduced kinetic energy, catastrophic engine, failure to achieve engine flameout, etc., and achieve the effect of reducing engine friction, reducing the risk of mechanical contact, and compact design

Inactive Publication Date: 2013-04-10
NEWCASTLE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the piston motion in a free piston engine is not limited by the crankshaft, sufficiently high kinetic energy of the piston assembly, such as due to rapid load reduction, could result in mechanical contact between the piston and cylinder head, which could be catastrophic for the engine
Conversely, a reduction in kinetic energy, e.g. due to a rapid load increase, may result in an ineffective compression of the cylinder charge and engine stall

Method used

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  • Free-piston internal combustion engine
  • Free-piston internal combustion engine

Examples

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Embodiment Construction

[0054] see figure 2 , The first embodiment of the free-piston internal combustion engine according to the invention comprises a first compression chamber 29a having a compression piston 23 reciprocating therein, and a first power chamber 18a having a first power piston 11a reciprocating therein. Conduit means in the form of a compressed charge passage 28 enables a compressed charge to be transferred from the first compression chamber 29a to the first power chamber 18a. Valve means in the form of suction valve 26a, discharge valve 27a, inlet valve 16a and discharge valve 13a control fluid flow into and out of the first compression chamber 29a and the first power chamber 18a. The compression piston 23 and the first power piston 11a are rigidly connected by a rod 19 to reciprocate in unison along a common axis defined by the rod 19 . During each reciprocating cycle of the compression piston 23 and the first power piston 11a, the compression piston 23 performs a suction stroke a...

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Abstract

A linear-acting, free-piston internal combustion engine suitable for operation on a four-stroke engine cycle comprises a power piston (11a, 11b) reciprocating in a power chamber (18a, 18b) and a compression piston (23, 23a, 23b) reciprocating in a compression chamber (29a, 29b). The power piston (11a, 11b) and the compression piston (23, 23a, 23b) are rigidly connected by means of a rod (19). The compression piston (23, 23a, 23b) performs alternately an intake stroke and a compression stroke and the power piston (11a, 11b) performs alternately a power stroke and an exhaust stroke.

Description

technical field [0001] This invention relates to free-piston internal combustion engines, and more particularly to free-piston internal combustion engines which allow for four-stroke cycle-like action. Background technique [0002] A free-piston internal combustion engine is a linear engine in which the need for a crankshaft system is eliminated and the power piston (or pistons) and associated components perform purely linear motion. figure 1 The configuration of a dual-piston free-piston engine system known in the prior art is shown. The engine includes two opposing combustion cylinders, each similar to those known in conventional two-stroke cycle crankshaft engines. The two combustion cylinder pistons are rigidly connected and form a piston assembly which is the only active moving component. The piston assembly is capable of linear movement, the outer limit of which motion is limited by the combustion cylinder. Two-stroke cycle action in each cylinder maintains the reci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01B11/00F02B33/06F02B71/00
CPCF01B11/004F02B33/06F02B63/041F02B71/00
Inventor 里卡德·米卡尔森安东尼·保罗·罗斯基利
Owner NEWCASTLE UNIV
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