Scientific Journal of Silesian University of Technology. Series Transport

6

Authors: Ján PETRÓCI, Martin MANTIČ, Jozef KUĽKA, Róbert BOSLAI

Initially, the development of a dual-purpose clutch was based on racing experiences and application requirements, as well as the results from testing the new power unit in the existing prototype vehicle. In order to achieve the highest possible driving range of the prototype vehicle, it has been necessary to eliminate the maximum possible losses and drive in unnecessary components. The design aimed to achieve simple access, reliability and low weight.

8

Authors: Robert GREGA, Jaroslav HOMIŠIN, Jozef KRAJŇAK, Matej URBANSKÝ

Dangerous vibrations of mechanical systems’ components are causes of failures and reduction in service life, as well lead to negative effects on the environment and the health of operators. In order to reduce these unwanted vibrations, it is necessary to pay attention to the proper design of components in mechanical systems. The aim of this article is based on the experimental measurements and demonstration of the effects of different types of flexible couplings on the size of vibration in a gearbox that forms part of a mechanical system.

8

Authors: Jozef KUĽKA, Melichar KOPAS, Eva FALTINOVÁ, Martin MANTIČ, Peter BIGOŠ

The main purpose of this article is to present a possible description of kinematic characteristics concerning the direction of travel of a selected mobile working machine in motion, namely, a hinged loader. This description is presented in the form of equations, which define the circumferential velocity as well as the angular velocity of the vehicle wheels during a ride involving a curve. In this way, it is also possible to describe a function of the axle differential.

9

Authors: Wojciech GÓRA, Jarosław JANUSZ, Jacek KŁOSIŃSKI

In this paper a control system of air compressors in a university laboratory is presented. The control system, which is built using the Astraada RCC972 and the GE 90-20 drivers, is an extension of the two states’ inputs and outputs of Astraada. To visualize the work stand, the PC computer class and the Proficy Machine Edition (ME) View software were applied. Selected results from the tests of the built control system are presented.

9

Authors: Igor OSTASHKO, Boris VINOGRADOV

The study presents the results of an investigation into centrifugal mills with an energy-saving working body. Rational geometric parameters of the working body of the centrifugal mill, which grinds the solid residue from the pyrolysis of used tyres, have been justified on the criterion of the lowest specific energy consumption during the grinding process. A method to determine the dependence of the in-grinding power consumption on the basic parameters of the working body has been developed, while an analytical expression to determine the power consumption for grinding the solid residue from the pyrolysis of used tyres has been obtained. It has been found that the power consumption in the grinding process linearly depends on the rotational speed of the working body, which is to the 0.3 power on the average size of solid particles.

11

Authors: Ondrej KOHL, Lubomir PESIK

The springing support in a driver’s seat is a very serious issue, such that manufacturers are increasing their efforts to optimize the dynamic properties of this kind of seat. The main optimization criterion is vibration insulation efficiency with regard to health research and associated health standards and regulations. This article deals with the definition of the optimal driver’s seat properties in relation to two examples of springing systems with different kinds of damping. The first case involves the springing support of a driver’s seat that uses a pneumatic spring and a telescopic hydraulic damper. In the second case, the damping effect is achieved by two pneumatic springs whose forces effect a phase shift due to a throttle valve located in the connecting piping system.

13

Authors: Józef DREWNIAK, Paulina GARLICKA, Aleksandra KOLBER

The article presents the design for a bi-planetary gear train. The project description is supplemented with calculations of kinematics, statics and meshing efficiency of the gear wheels included in the gear train. Excluded are calculations of strength and geometry of gears, shaft and rolling bearing, since they are similar to classical calculations for planetary gears. An assembly drawing in 2D and assembly drawings in 3D of the designed bi-planetary gear train are also shown. This gear train will form the main element of the research in hand.