Hydraulic machine

Details Hydraulic machine Hydraulic machine

2011-06-21

2011-06-21

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

C418S189000

Reexamination Certificate

active

07963754

ABSTRACT:
The invention concerns a hydraulic machine with a set of teeth, having a toothed ring with an inner toothing and a gear wheel with an outer toothing, the gear wheel rotating and orbiting in the toothed ring, the inner toothing and the outer toothing touching each other in contact areas, thus separating pressure chambers, and with a valve arrangement controlling a connection between a connection arrangement having a high pressure connection and a low pressure connection, and the pressure chambers. It is endeavoured to achieve a stable operation, particularly with low speeds. For this purpose, each contact area is provided with an opening, which, at the time when a pressure chamber reaches an extreme value of its volume, produces a short-circuiting with the neighbouring pressure chamber.

REFERENCES:
patent: 2657638 (1953-11-01), English
patent: 3606601 (1971-09-01), White, Jr. et al.
patent: 3775031 (1973-11-01), Hansen
patent: 3876343 (1975-04-01), Giversen
patent: 4145167 (1979-03-01), Baatrup
patent: 4390329 (1983-06-01), Thorson
patent: 4859160 (1989-08-01), White, Jr.
patent: 5215453 (1993-06-01), Petersen et al.
patent: 6126424 (2000-10-01), Wenker et al.
patent: 0 959 248 (1999-11-01), None
patent: 9264494 (1997-10-01), None

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