Gear pump

About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.

Tandem, swash plate pump having drive force take-out mechanism

Abstract: A tandem, swash plate-type hydraulic pump in which a drive force transmission system for extending one or more hydraulic pumps and a structure relating to the system can be made simple and light, and one or more hydraulic pumps even when extended can be compactly arranged without increasing the axial length of the pump unit. A drive force take-out mechanism for taking outward part of a driving force out of a spline sleeve member of a spline coupling which is an intermediate coupling of a tandem, swash plate-type hydraulic pump. A first gear is connected with a spline sleeve member and a gear box. The gear box is composed of an intermediate gear, a driven gear, a spline sleeve member, and a gear case for rotatably housing these components. The gear box is removably fixed to an intermediate block and provided on both surfaces of the gear case are pump mounting portions for mounting hydraulic pumps which may be added as appropriate. Suction and discharge channels are disposed vertically in the mounting direction of the drive force take-out mechanism.

Liquid and air mixing gear pump

Abstract: The air intake ports of a liquid and air sucking and mixing gear pump are put into communication with the atmosphere through a collecting tank or chamber, in which the small amounts of foamy liquid-and-air emulsion flowing out from said ports during the stopping time of the pump are collected, and from which the amounts of emulsion are again sucked back into the pump as soon as the pump operation is again started.

Hydraulic system having implement and steering flow sharing

Abstract: A hydraulic system for a machine is disclosed. The hydraulic system may have a first pump with variable displacement and being load-sense controlled, and a first hydraulic circuit associated with the first pump. The hydraulic system may also have a second pump with variable displacement and being electro-hydraulically controlled, and a second hydraulic circuit associated with the second pump. The hydraulic system may further have a flow-sharing valve arrangement configured to selectively share fluid flow between the first and second hydraulic circuits.

Method and apparatus for applying single or multicomponent materials

Abstract: A method and apparatus for metering and pumping multicomponents of high and low viscosity materials and subsequently mixing and applying such mixture includes gear pumps (62, 64) for pumping each component. Each gear pump has gears (156, 162) operating in a gear housing (66) for receiving and pumping one of the components. The gear pumps are simultaneously driven at a predetermined speed and each gear pump is designed to pump a predetermined amount of its respective components, at the predetermined speed. Flexible hoses (42, 44) connect the pumps (62, 64) to an applicator (44). Check valves (96, 98) are used to maintain the pressure in these hoses when the pumps are in their at-rest position. The gear pumps (62, 64) may be driven at the same rotational speed but are designed to pump a predetermined amount of the different materials so that the ratio of materials can be precisely set. Where a single fluid is pumped, a gear pump (62′, 62″) is driven by a hydraulically driven torque motor (64′) or an electric motor (70″). The pump has a discharge connected by a hose (40′, 40″) to a dispenser (44′, 44″). A check valve (96′, 96″) is used to maintain the pressure in the hose when the pump is in its at-rest position. The gear pump need only be operated as necessary to maintain pressure in the hose. Precise metering of the fluid pumped is accomplished by controlling the operation of the gear pump.

Fuel delivery system and method

Abstract: A fuel delivery system for supplying high pressure fuel flow to a gas turbine engine which includes a first stage ejector pump driven by a second stage compressor which is driven by a hydraulically operated turbine supplied with fuel flow from a third stage gear pump.