Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Reexamination Certificate
2006-02-02
2008-07-22
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
C060S394000, C091S035000, C091S520000
Reexamination Certificate
active
07401466
ABSTRACT:
The invention relates to a hydraulic drive, especially for two-cylinder thick matter pumps. Said hydraulic drive comprises at least one main pump (10) embodied as a hydraulic variable displacement pump, and two hydraulically actuatable drive cylinders (20, 22) that are each connected to a connection line (16, 18) of the main pump (10) by means of pump connections mounted on one end thereof, forming a closed hydraulic circuit, and communicate with each other at the ends thereof opposing the pump connections (24, 26) by means of a swinging oil line (28). The hydraulic drive also comprises a feed pump (42), by which means pressurized oil is fed from an oil tank to the current low-pressure side into the hydraulic circuit, and a flushing branch (52), by which means a flushing oil flow is branched off from the current low-pressure side under a limited pressure into the oil tank (44). In order to avoid low-pressure influxes during the reversal process of the main pump (10), the flushing oil flow is blocked and then released in a time-delayed manner during each reversal process of the main pump (10), independently of the differential pressure in the connection lines.
REFERENCES:
patent: 5238371 (1993-08-01), Benckert
patent: 5344290 (1994-09-01), Benckert
patent: 6171075 (2001-01-01), Munzenmaier et al.
Hoevemeyer Dirk
Renz Hans
Von Baeumen Paul
Leslie Michael
Patent Central LLC
Pendorf Stephan
Putzmeister Aktiengesellschaft
LandOfFree
Hydraulic drive, in particular for two-cylinder thick matter... 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 drive, in particular for two-cylinder thick matter..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic drive, in particular for two-cylinder thick matter... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3972926