Multi-piece piston for a free piston machine

Details Multi-piece piston for a free piston machine Multi-piece piston for a free piston machine

2007-04-12

2009-10-13

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Piston with rigid axially extending hollow stem

Hollow stem forms axially extending fluid passage

C092S153000, C060S520000

Reexamination Certificate

active

07600464

ABSTRACT:
The concentricity and coaxiality of a central bore through a piston for a free piston Stirling machine is improved with a piston that has a sleeve with a core constructed from at least two, separate, axially-engaging core components sealed within the sleeve. During fabrication, a central bore is machined through each of the core components. The piston is assembled by heating the sleeve and cooling the core components, inserting the core components into the sleeve and then allowing the sleeve to cool and the core components to warm. This drives the core components into sealed engagement with each other and with the sleeve and aligns the central bore coaxially with the outer cylindrical surface of the sleeve.

REFERENCES:
patent: 4802332 (1989-02-01), Beale
patent: 5502968 (1996-04-01), Beale
patent: 6293184 (2001-09-01), Unger
patent: 6694730 (2004-02-01), O'Baid et al.
patent: 6901845 (2005-06-01), Kiikka

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