Pumps – Plural pumps with individual or relative control
Reexamination Certificate
2006-08-15
2006-08-15
Freay, Charles G. (Department: 3746)
Pumps
Plural pumps with individual or relative control
C417S286000, C417S427000, C417S428000, C417S429000, C060S425000, C091S519000, C091S489000, C091S492000
Reexamination Certificate
active
07090475
ABSTRACT:
A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being connected to the discharge side with a bypass connection by a valve arrangement for a selected number of engine pistons. The control circuit provides a space-saving way of ensuring that the changeover between speeds occurs smoothly and in such a manner to preserve the individual components as far as possible. To this end, at least one intermediate switching position, in which the delivery side is throttled to the discharge side, i.e. connected by a diaphragm-type arrangement, is provided in front of valve arrangement between the two end switching positions. The valve arrangement is preferably driven such that a valve body can be moved through the intermediate switching position at a controlled speed.
REFERENCES:
patent: 4051868 (1977-10-01), Andersen
patent: 4404896 (1983-09-01), Allart et al.
patent: 4538505 (1985-09-01), Morillon
patent: 4543786 (1985-10-01), Shuler
patent: 4724742 (1988-02-01), Bigo et al.
patent: 5001964 (1991-03-01), Allart et al.
patent: 5220790 (1993-06-01), Allart et al.
patent: 5435135 (1995-07-01), Lallier et al.
patent: 5857330 (1999-01-01), Ishizaki et al.
patent: 6007163 (1999-12-01), Sawada
patent: 6099273 (2000-08-01), Allart et al.
patent: 6318235 (2001-11-01), Allart et al.
patent: 6422804 (2002-07-01), Gitter
patent: 6609368 (2003-08-01), Dvorak et al.
patent: 6675575 (2004-01-01), Cunningham
patent: 42 06 729 (1992-09-01), None
patent: 0 872 637 (1998-10-01), None
patent: 0 921 309 (1999-06-01), None
patent: 1 058 002 (2000-12-01), None
patent: WO 01/02205 (2001-01-01), None
Freay Charles G.
Mannesmann Rexroth AG
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sayoc Emmanuel
LandOfFree
Hydraulic control circuit for a hydraulic engine with at... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control circuit for a hydraulic engine with at..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control circuit for a hydraulic engine with at... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3638565