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@PHDTHESIS{Pietrzyk:838793,
author = {Pietrzyk, Tobias},
othercontributors = {Schmitz, Katharina and Jacobs, Georg},
title = {{E}ntwicklung einer {H}ochdrehzahl-{I}nnenzahnradpumpe für
die {E}lektrifizierung mobiler {A}nwendungen am {B}eispiel
einer autarken dezentralen elektro-hydraulischen {A}chse},
volume = {109},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Düren},
publisher = {Shaker},
reportid = {RWTH-2022-00767},
isbn = {978-3-8440-8389-7},
series = {Reihe Fluidtechnik. D},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Druckausgabe: 2022. - Auch veröffentlicht auf dem
Publikationsserver der RWTH Aachen University. - Hinweis:
Übersetzungstitel mit Rechtschreibkorrektur muss lauten:
"Design of a high speed internal gear pump for mobile
applications"; Dissertation, RWTH Aachen University, 2021},
abstract = {The electrification of mobile machinery becomes more and
more important. Therefore, it is necessary to increase the
power density of electro-hydraulic drives in order to meet
the structural restrictions in mobile hydraulics. The use of
high speed components (n > 10000 rpm) contributes
significantly to improving the power density, but fails due
to the speed limit of current pumps. Within the scope of
this thesis, the suitability for high speed operation is
investigated using the example of a gap compensated internal
gear pump was investigated for a drive speed up to 10000 rpm
and a displacement of about 4 cm³. For this purpose the
kinematical, mechanical and hydraulical processes within the
pump are analyzed. The forces and torques acting in an
internal gear pump are considered and the kinematical
displacement process is discussed. Furthermore, the
influence of the geometric dimensions of gears on the speed
limit is considered with the help of numerical flow
simulations. For the calculation of the radial gap
compensation, the pressure build-up using different pressure
compensation notches is examined and the radial compensation
ratio at different speeds is calculated. For the design of
the axial gap compensation a simulation model is built in
MATLAB to solve the Reynolds equation in the lubrication
gap. The calculations influence the design of a high speed
internal gear pump. In the component testing, the
suitability for high speed is experimentally proven and the
partial and total efficiencies are discussed. One possible
application for the high speed internal gear pump are
decentralized electrohydraulic actuators (EHA), which
replaces the stick cylinder of a compact excavator. For this
purpose, a hydraulic system architecture with corresponding
control and regulation concept in 4-quandrantum operation is
presented. Subsequently, the constructive implementation of
the EHA is explained and the results of the test series are
shown.},
cin = {412810},
ddc = {620},
cid = {$I:(DE-82)412810_20180620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2022-00767},
url = {https://publications.rwth-aachen.de/record/838793},
}
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