Class / Patent application number | Description | Number of patent applications / Date published |
417286000 | Plural pump units with individual or relative control | 8 |
20100322791 | HYDRAULIC SYSTEM WITH SUPPLEMENT PUMP - If a hydraulic system has several modes of operation, in particular a mode with a high pressure demand (II) and a mode with a high fluid flow demand (II), the hydraulic fluid pump has to be built with an accordingly high fluid flow output. Such a pump is expensive. Therefore it is suggested, to provide two pumps. I.e. a controllable main pump ( | 12-23-2010 |
20110142690 | PUMP APPARATUS, POWER TRANSMISSION APPARATUS, AND VEHICLE - A pump apparatus configured with a first pump for pumping working fluid in accordance with a reciprocation of a piston using a space between a first open/close valve for suction and a second open/close valve for discharge as a pump chamber. The pump apparatus is also configured a first flow passage for supplying the working fluid from a supply source to an operation subject via the first open/close valve, the pump chamber, and the second open/close valve in accordance with an operation of the first pump. A second flow passage supplies the working fluid pumped by a second pump, which is different from the first pump, to the pump chamber. A selector is configured to select either the first flow passage or the second flow passage. | 06-16-2011 |
20110262287 | HYDRAULIC PUMP CONTROLLER FOR CONSTRUCTION MACHINE - A hydraulic pump controlling apparatus of a construction machine according to the present disclosure includes: a hydraulic pump in which a swash plate angle is controlled to control a discharge flow; an auxiliary pump; a control valve controlling a flowing direction of a fluid discharged from the hydraulic pump and selectively supplying the fluid to an actuator; an orifice and a relief valve connected between a center bypass line of the control valve and a tank T to be parallel to each other; signal pressure selecting units receiving a fluid passing through the center bypass line of the control valve and a fluid discharged from the auxiliary pump, and selecting the pressure of any one of the fluids as a signal pressure; and a regulator receiving the signal pressure selected from the signal pressure selecting units to control the swash plate angle of the hydraulic pump, and the signal pressure selecting unit selects the pressure of the fluid discharged from the auxiliary pump as the signal pressure and transfers the selected pressure to the regulator when the construction machine is in an idle state. | 10-27-2011 |
20120070318 | OIL PUMP UNIT WITH VARIABLE FLOW RATE - An oil pump unit with a variable flow rate includes lubrication pumps and a control pump that are driven by rotation of a crankshaft of an engine, and changes an oil supply amount from the control pump to each part of the engine, in which the control pump includes a plurality of oil pumps that have different discharge rates. | 03-22-2012 |
20140294618 | HYDRAULIC PRESSURE SUPPLY SYSTEM OF AUTOMATIC TRANSMISSION - An automatic-transmission hydraulic pressure supply system includes a low-pressure hydraulic pump supplying low hydraulic pressure to a first low-pressure line, a low-pressure regulator valve recirculating through a first recirculation line a portion of the hydraulic pressure supplied through the first low-pressure line to regulate the hydraulic pressure of the first low-pressure line, and supplying the regulated hydraulic pressure to a low pressure portion through a second low-pressure line, a high-pressure hydraulic pump receiving a portion of the hydraulic pressure of the first low-pressure line, increasing and supplying the increased hydraulic pressure to a high pressure portion through a high-pressure line, and a high-pressure regulator valve recirculating a portion of the hydraulic pressure supplied through the high-pressure line through second and/or third recirculation lines, and supplying the regulated hydraulic pressure to the high pressure portion. | 10-02-2014 |
20150030472 | HYDRAULIC PRESSURE SUPPLY SYSTEM OF AUTOMATIC TRANSMISSION FOR VEHICLE - A hydraulic pressure supply system of an automatic transmission for a vehicle may be provided with first and second pump chambers and may supply hydraulic pressure generated at the first and second pump chambers selectively to a high pressure portion or the high pressure portion and a low pressure portion. The hydraulic pressure generated at the first pump chamber may be supplied to the high pressure portion through a high-pressure regulator valve, and the hydraulic pressure generated at the second pump chamber may be supplied to the low pressure portion through a low-pressure regulator valve or may be supplied to the high-pressure regulator valve according to switching operation of a switch valve. | 01-29-2015 |
417288000 | Sequentially operated separate relief or bypass passages | 2 |
20090297370 | COMBINED POWER PACK UNIT - A power pack unit includes a first hydraulic pump including a first pump enclosure accommodating a first pump cartridge. A second hydraulic pump includes a second pump enclosure accommodating a second pump cartridge. A hydraulic fluid reservoir is positioned between the first and second hydraulic pumps. A first end of the reservoir is secured to the first pump enclosure and a second end of the reservoir is secured to the second pump enclosure. The first and second hydraulic pumps and the reservoir can extend along a common axis. First and second motors can be connected to the first and second pumps. The entire structure can extend along a common axis. | 12-03-2009 |
20120156061 | Flow Sensing Dual Pump Switching System and Method - A flow sensing dual pump switching system and method are provided that control the supply of fuel from a dual pump fuel system to a fuel metering unit. The system senses bypass pressure from the fuel metering unit to control the differential pressurization of the second pump. As the bypass is reduced, the pressure of the second pump is increased so that it may be added to that of the first pump to supply the increased fuel consumption needs of an engine. As the fuel consumption needs decrease, the flow from the second pump added to the first pump is reduced and the differential pressure of the second pump is similarly reduced. If the bypass pressure remains high, the switching system disconnects the output of the second pump from that of the first in favor of bypassing the flow to its input to reduce its differential pressure and conserve energy. | 06-21-2012 |