Expansible chamber devices – Passage in cylinder for application of separate fluid to...
Reexamination Certificate
2007-11-13
2007-11-13
Leslie, Michael (Department: 3745)
Expansible chamber devices
Passage in cylinder for application of separate fluid to...
C092S169100
Reexamination Certificate
active
11191918
ABSTRACT:
A hydraulic linear drive, in particular for a hydraulic transmission actuator, has a piston/cylinder unit in which an adjusting piston is situated so that it is longitudinally displaceable in a cylinder housing and divides a cylinder space into at least two pressure spaces. The pressure spaces can be acted upon by hydraulic oil via controllable pressure supply through hydraulic lines. A sealing ring is situated on the adjusting piston or on the cylinder housing for sealing, the two pressure spaces with respect to one another. The sealing ring is accommodated in a ring groove on the cylinder housing so as to seal with its inside against the adjusting piston. A sealing pressure supply system communicates hydraulic oil to the outside of the sealing ring so as to control the sealing pressure of the sealing ring on the piston surface.
REFERENCES:
patent: 3312149 (1967-04-01), Fleckenstein et al.
patent: 4342336 (1982-08-01), Satterthwaite et al.
patent: 5079997 (1992-01-01), Hong
patent: 6283156 (2001-09-01), Motley
Translation of German Publication mentioned in Specification entitled: “Toothed Gearing”, Second Edition vol. 26, Springer Verlag, 5 pages.
Crowell & Moring LLP
Dr. Ing. h.c.F. Porsche Aktiengesellschaft
Leslie Michael
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