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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
06 Dec 1971
TL;DR: In this paper, a hydraulic power translating device of the gerotor type having inner and outer rotatable partially meshing gear elements with a pressure fluid passage surrounding a major part of the exterior periphery of the outer gear element to obtain radial balance of the inner gear element upon start up in motor operation and with a plurality of recesses formed in the case of the device and at the crossover areas which operate as fluid accumulators of limited capacity to reduce the noise of operation of a device as well as torque variations and to compensate for tolerance and natural frequency variations in the mechanical structure and to also
Abstract: A hydraulic power translating device of the gerotor type having inner and outer rotatable partially meshing gear elements with a pressure fluid passage surrounding a major part of the exterior periphery of the outer gear element to obtain radial balance of the outer gear element upon start up in motor operation and with a plurality of recesses formed in the case of the device and at the cross-over areas which operate as fluid accumulators of limited capacity to reduce the noise of operation of the device as well as torque variations and to compensate for tolerance and natural frequency variations in the mechanical structure and to also axially balance the gear elements.

25 citations

Patent
02 Apr 1970
TL;DR: An improved rotor and gear assembly for rotary mechanisms, such as combustion engines or the like, in which the gear is seated in one face of the rotor and secured to the rotor by a plurality of circumferentially spaced fastening means extending from the face of rotor opposite from the gear, through the rotor, into the gear to thereby flexibly secure the gear against radial movement due to thermal distortion resulting from cyclically varying stress loads and thermal induced stresses as mentioned in this paper.
Abstract: An improved rotor and gear assembly for rotary mechanisms, such as combustion engines or the like, in which the gear is seated in one face of the rotor and secured to the rotor by a plurality of circumferentially spaced fastening means extending from the face of the rotor opposite from the gear, through the rotor, into the gear to thereby flexibly secure the gear against radial movement due to thermal distortion resulting from cyclically varying stress loads and thermal induced stresses.

24 citations

Journal ArticleDOI
TL;DR: The design, construction, and testing of a low-cost and fully programmable pulsatile flow pump capable of continuously producing unlimited cycles of physiologic waveforms that can be controlled via common scientific software and thus easily implemented into large automation frameworks are discussed.
Abstract: Benchtop in vitro experiments are valuable tools for investigating the cardiovascular system and testing medical devices. Accurate reproduction of the physiologic flow waveforms at various anatomic locations is an important component of these experimental methods. This study discusses the design, construction, and testing of a low-cost and fully programmable pulsatile flow pump capable of continuously producing unlimited cycles of physiologic waveforms. It consists of a gear pump actuated by an AC servomotor and a feedback algorithm to achieve highly accurate reproduction of flow waveforms for flow rates up to 300 ml/s across a range of loading conditions. The iterative feedback algorithm uses the flow error values in one iteration to modify the motor control waveform for the next iteration to better match the desired flow. Within four to seven iterations of feedback, the pump replicated desired physiologic flow waveforms to within 2% normalized RMS error (for flow rates above 20 mL/s) under varying downstream impedances. This pump device is significantly more affordable (∼10% of the cost) than current commercial options. More importantly, the pump can be controlled via common scientific software and thus easily implemented into large automation frameworks.

24 citations

Patent
19 Mar 1987
TL;DR: In this paper, an electrically operated vehicle in which a battery provides energy for driving an electric motor coupled to a pump for pressurizing hydraulic fluid that is transmitted to a hydraulic motor transmission comprising either a worm screw gear or rack gear with each end operatively connected to a piston inside a cylinder having a chamber for receiving pressurized fluid providing power for reciprocatably driving either worm screw gears or a rack gear to operative elements for providing rotation to an output shaft operating either to the axles or the differential of a vehicle.
Abstract: An electrically operated vehicle in which a battery provides energy for driving an electric motor coupled to a pump for pressurizing hydraulic fluid that is transmitted to a hydraulic motor transmission comprising either a worm screw gear or rack gear with each end operatively connected to a piston inside a cylinder having a chamber for receiving pressurized fluid providing power for reciprocatably driving either a worm screw gear or a rack gear to operative elements for providing rotation to an output shaft operatively connected either to the axles or the differential of a vehicle. Provision is also made for the recovery of kinetic energy by the application of a series of wind generators and a series of gravitational generators responsive to vehicular movement. Additional electricity is generated by connecting a second hydraulic motor transmission to a series of alternators arranged for supplying electricity to the principal battery source for electrical power for driving the vehicle and also to a second battery source for driving the second hydraulic motor.

24 citations

Journal ArticleDOI
01 Feb 1984
TL;DR: In this paper, a computer aided approach to the design of fixed and floating end plates in gear pumps is presented, taking account of the relative tilt of the plates and gears and of the hydrodynamically and hydrostatically generated pressures between the gears and end plate.
Abstract: This paper presents a computer aided approach to the design of fixed and floating end plates in gear pumps. Account is taken of the relative tilt of the plates and gears and of the hydrodynamically and hydrostatically generated pressures between the gears and end plate. Criteria for achieving load and moment balance are outlined and the effects of cavitation discussed. It is shown that the approach leads to an understanding of the behaviour of wear plates and enables the effect of changes in plate design to be assessed.

24 citations


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