Piston lubrication for a free piston engine

Details Piston lubrication for a free piston engine Piston lubrication for a free piston engine

2005-12-06

2005-12-06

Dolinar, Andrew M. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

C123S1960CP

Reexamination Certificate

active

06971341

ABSTRACT:
A free piston engine is configured with a pair of opposed engine cylinders located on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each operatively located in a respective one of the engine cylinders, with a push rod connected between the inner pistons. The push rod extends through an inner pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. An outer piston assembly includes a pair of pistons, one each operatively located in a respective one of the engine cylinders, with at least one pull rod connected between the outer pistons. The pull rod extends through an outer pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. The movement of the inner and outer piston assemblies during engine operation will cause the fluid plungers to pump fluid from a low pressure container into a high pressure chamber as a means of storing the energy output from the engine. Alternatively, the piston assemblies may drive a linear alternator. Located adjacent to at least one of the pistons are oil holes, with an oil mist annulus supplying oil mist therethrough. The oil in the oil mist will lubricate the engine cylinder wall while minimizing the oil consumption of the engine.

REFERENCES:
patent: 2853982 (1958-09-01), Bachle et al.
patent: 5375573 (1994-12-01), Bowman
patent: 6463903 (2002-10-01), Berlinger et al.

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