Free piston end position limiter

Details Free piston end position limiter Free piston end position limiter

1994-06-27

1996-07-23

Lazarus, Ira S.

Power plants

Motor operated by expansion and/or contraction of a unit of...

Unit of mass is a gas which is heated or cooled in one of a...

60520, 417417, 137510, 137907, F01B 2910, F04B 1704, F16K 31365

Patent

active

055378200

ABSTRACT:
A piston end position limiter for a free piston machine of the type having a piston sealingly reciprocating in a cylinder and separating a work space bounded at one end of the piston from a second space bounded at the opposite end of the piston. The work space and the second space contain a working fluid having an average pressure. A first valve is connected in communication between a fluid reservoir and the work space and is adapted to open only when the working fluid pressure varies sufficiently in one direction from its average pressure. A second position responsive valve is connected between the reservoir and the second space and is operatively linked to the piston for opening in response to the piston reaching a selected end limit of its reciprocation.

REFERENCES:
patent: 4836757 (1989-06-01), Curwen et al.
patent: 5275542 (1994-01-01), Terauchi
patent: 5409035 (1995-04-01), Seoh et al.
Stirling Engines, authored by Walker, published 1980 by Claredon Press, Oxford. pp. 270-274.

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