Seal for piston rod of Stirling engine

Details Seal for piston rod of Stirling engine Seal for piston rod of Stirling engine

1985-03-18

1986-01-14

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 15, 277 12, 277 30, 277177, F16J 1540, F16J 1556

Patent

active

045642028

ABSTRACT:
A seal for a piston rod of a Stirling engine forcibly returns a fluid which has leaked into an intermediate chamber from this chamber to a fluid-filled chamber via an oil scraper adjacent thereto. The seal includes an O-ring secured to the piston rod at a position where the O-ring will be situated immediately above an oil scraper when the piston rod is at bottom dead center. The intermediate chamber includes a space contiguous to the oil scraper and of a reduced diameter sized to the outer diameter of the O-ring. When the piston rod descends toward bottom dead center, the O-ring is carried thereby into the reduced-diameter space toward the oil scraper. Owing to sliding pressured contact between the outer circumference of the O-ring and the inner wall of the reduced-diameter space, the latter is pressurized to forcibly impel a fluid, which has leaked into the intermediate chamber, from the reduced-diameter space into the fluid-filled chamber through the oil scraper.

REFERENCES:
patent: 2964339 (1960-12-01), Macks
patent: 3810634 (1974-05-01), Hakansson
patent: 3814553 (1974-06-01), Hubschmann
patent: 4083566 (1978-04-01), Bengtsson et al.
patent: 4206928 (1980-06-01), Asano
patent: 4247121 (1981-01-01), Bergman
patent: 4432556 (1984-02-01), Green et al.
patent: 4483141 (1984-11-01), Kobayashi et al.

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