Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1988-03-09
1989-05-30
Look, Edward K.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Second path activated in response to pressure or flow in...
91511, 91512, 91519, 60428, 60430, F01B 2904, F16D 3102
Patent
active
048339717
ABSTRACT:
A self-regulating hydraulic control circuit for controlling the flow of fluid to and from the cylinder of a double-acting hydraulic motor employs two pumps, one of which supplies fluid at a relatively high pressure and low displacement while the second pump is a relatively high displacement pump which operates only against a relatively low pressure requirement. The system is especially adapted for applications where, during a working stroke, the piston of the hydraulic motor moves from a start position through a first portion of the stroke during which the piston encounters but a minimal resistance to movement and then suddenly encounters a high resistance to movement. One example of such an application would be a press in which, at some point during the stroke of the piston, a tool carried by the piston initially encountered a workpiece. The control circuit is so designed that during the initial or free travel portion of the piston stroke, a low volume-high pressure pump is connected in a closed loop system via a directional control valve to two opposed faces of the piston which are of equal area. The high displacement pump is connected to act against a third face of the piston. The high volume of fluid supplied from the high volume pump will drive the piston rapidly through the free travel portion of its stroke. The increased pressure in the fluid circuit resulting from contact between a piston carried tool and a workpiece is employed to disconnect the high volume pump from the cylinder to avoid overloading the drive motor of that pump at the same time the high pressure pump is connected to apply pressure against the third face of the piston.
REFERENCES:
patent: 3104591 (1963-06-01), Cudnohufsky
patent: 3279484 (1966-10-01), Brinkel
patent: 3640066 (1972-02-01), Marshall et al.
patent: 3744375 (1973-07-01), Kubik
patent: 4121501 (1978-10-01), Finley
patent: 4164119 (1979-08-01), Parquet
patent: 4565116 (1986-01-01), Hehl
Denion Thomas
Look Edward K.
LandOfFree
Self-regulated hydraulic control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-regulated hydraulic control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-regulated hydraulic control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2144036