Prilog sintezi pogonskog mehanizma obrtne platforme hidrauličkih bagera
Author
Jovanović, Vesna D.Mentor
Janošević, DragoslavCommittee members
Jovanović, MiomirPavlović, Nenad

Gašić, Milomir
Petrović, Goran
Metadata
Show full item recordAbstract
The dissertation defines the general methodology for the synthesis of the slewing
platform drive mechanism of hydraulic excavators. The methodology of the synthesis
of the drive mechanism of the excavator slewing platform is based on the modular
design process, by which the drive components are defined on the basis of the
parameters of drive functions and functional constraints of the available components of
the drives produced by specialized manufacturers. The obtained research results are
related to: the analysis of the parameters of drive functions, the selection of the axial
bearing, and the synthesis of the slewing platform drive mechanism of the excavator.
An analysis of the function parameters, i.e. the load components and the energy
parameters of the drive mechanism of the excavator slewing platform, was carried out
through numerical and experimental analysis based on the developed general dynamic
mathematical models of excavators and software. The analysis of the fu...nction
parameters shows that the primary influence on the platform drive is exerted by the
forces and moments of the digging resistance and the gravitational force of the
members of the kinematic chain and the affected material.
For the selection of the size of the drive mechanism axial bearing, mathematical
models and software were designed to determine the spectra of loads, which are used,
in relation to the permissible load bearing capacity, to select the appropriate bearing
size from a set of the available ones. The load spectrum builds equivalent load forces
and moments, which are defined on the basis of the limit of the digging resistance that
enables the stability of the excavator and that can overcome the maximum operation of
the drive mechanisms of the excavator manipulator. The results of the conducted
research, within the framework of the dissertation, show that for the selection of the
axial bearing of the slewing platform, the equivalent loads that occur during the
digging operation with the backhoe and shovel manipulator are applicable. A
mathematical model is defined for the synthesis of the drive mechanisms of the
slewing platform and software is developed for generalizing possible variant drive
solutions by selecting the drive components: hydraulic pump, hydraulic motor and
planetary gear, from the files of the available components according to the parameters
of the drive functions and the selected axial bearing size. The results of the synthesis
show that for the same given parameter functions, variant solutions are generated with
different transformational and transfer parameters, i.e. with hydraulic motors with a
smaller specific flow and a higher ratio and vice versa.