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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.


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Patent
12 Jan 1989
TL;DR: A reversible anti-backlash power transmission for selectively transmitting power in opposite directions without backlash in the gear train is described in this article. But the transmission is not suitable for high-speed applications.
Abstract: A reversible anti-backlash power transmission for selectively transmitting power in opposite directions without backlash in the gear train. The transmission includes interconnected first and second gear boxes. Each gear box includes a drive shaft having a worm associated with the drive shaft for rotation therewith, a worm gear in meshing engagement with the worm, a driven shaft associated with the worm gear for rotation therewith, and a pinion gear structurally associated with the drive shaft for rotation therewith. A rack gear is in meshing engagement with the pinion gear of each of the first and second gear boxes. An electro-magentic coupler interconnects the drive shafts of the gear boxes. The coupler allows the automatic angular displacement of the drive shafts of the two gear boxes relative to each other to eliminate gear backlash in any of the mating gears.

14 citations

Patent
09 Dec 2009
TL;DR: In this article, an electro-hydraulic driver of a control valve, which comprises a hydraulic driving system, a pressure sensor, a flow sensor, position sensor and a control unit, is presented.
Abstract: The invention provides an electro-hydraulic driver of a control valve, which comprises a hydraulic driving system, a pressure sensor, a flow sensor, a position sensor and a control unit; wherein, the hydraulic driving system is used for driving a valve core of the control valve and comprises a bidirectional driving cylinder, a directional control valve, a three-position four-way reversing valve, an energy accumulator, a servo motor and a bidirectional gear pump; the pressure sensor and the flow sensor are installed on a fluid output pipeline, are used for detecting the pressure and the flow of the output fluid in the pipeline and are connected with the control unit; the position sensor is used for detecting the valve core position of the control valve to be controlled and is connected with the control unit The electro-hydraulic driver realizes that hydraulic oil can flow out of an oil outlet cavity and directly enter an oil inlet cavity without passing through an oil tank, and has simple and compact structure; the motor and the oil pump do not need to continuously run but operate intermittently, which can not only save energy but also prolong the service life of the system, thus realizing stable operation for extra-long time and quick response of the control valve with high reliability

14 citations

Journal ArticleDOI
TL;DR: In this article, an original concept for variable delivery external spur gear machines is presented, which combines the well-known advantages of these units (such as low cost, good reliability, acceptable efficiency) in a solution capable of varying the amount of flow displaced at each shaft revolution.
Abstract: This paper presents an original concept for variable delivery external spur gear machines, which combines the well-known advantages of these units (such as low cost, good reliability, acceptable efficiency) – traditionally fixed displacement – in a solution capable of varying the amount of flow displaced at each shaft revolution. The proposed design concept realizes a variable timing for the connections of each tooth space volume with the inlet and outlet ports, through a movable element (“slider”) placed at the gears lateral side. The position of the slider determines the amount of flow displaced by the unit per revolution. In order to extend the range of flow variation achievable by the unit, an asymmetric involute tooth profile for the gears was proposed. A multi-objective genetic algorithm was used to optimize the design of the gears along with the design of the timing grooves in the slider. This algorithm is based on the HYGESIM (HYdraulic GEar machines Simulator) tool developed by the authors’ resea...

14 citations

Patent
18 Jul 1990
TL;DR: In this article, a viscous fluid pumping system with a pair of opposing gears is described, where the gears exert high shear forces and localized heating to the fluid, decreasing its viscosity, and the fluid exits the system through an outlet in the gear housing.
Abstract: A viscous fluid pumping system having a pair of opposing gears (130, 132) is provided in a housing (32) disposed above an inlet port (73) in a follower plate (70). The follower plate (70) is dimensioned to sealingly fit in a container or drum (D) filled with highly-viscous fluid. In operation, the gears generate a vacuum between the follower plate (70) and the viscous fluid, allowing atmospheric pressure to press the follower plate into the viscous fluid. This, in turn, forces the fluid through the inlet port (73) and into the gears (130, 132). The gears exert high shear forces and localized heating to the fluid, decreasing its viscosity. The fluid exits the system through an outlet in the gear housing. The pumping system may use two such pumps working in conjunction or incorporate a single such pump with a valve structure for recycling fluid through itself.

14 citations

Patent
06 Feb 1985
TL;DR: The Gerotor unit as discussed by the authors is a pair of radially arranged units which units are known in the art as gerotors and which therefore includes a shaft for mounting or driving a first gear rotor of a first size, a rotor ring which is provided for both orbital and rotational movement with respect to the first-and second-order rotor, and a stationary ring gear surrounding the rotor ring.
Abstract: Apparatus responsive to fluid pressures and capable of providing fluid under pressure to provide a unit which may selectively be used as a fluid motor or a fluid driven motor pump unit depending upon fluid directing and control structures and with minimal modifications to achieve the various desired functions. The unit consists of a pair of radially arranged units which units are known in the art as gerotors and which therefore includes a shaft for mounting or driving a first gear rotor of a first size, a rotor ring which is provided for both orbital and rotational movement with respect to the first gear rotor and with respect to a stationary ring gear surrounding the rotor ring. Valving plates including stationary and moving plates are provided to control fluid flow either between chambers formed by the various gear members and rotor ring for parallel flow when the unit is operating as a motor or individual chamber flow when the unit is operated as a motor pump. The rotation and rotation and orbital movements of the various members provides expanding and contracting fluid chambers for fluid flow and thus operation of the apparatus in its selected mode. A uniqueness of the apparatus lies in the utilization of plate valving to eliminate or reduce normally faced sealing problems and to reduce size of the unit in comparison to gerotor units which are joined in a longitudinal fashion.

14 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202251
202154
2020137
2019198
2018276