• MACHINES

    Simulation tests of the braking process of an agricultural tractor

    Machines. Technologies. Materials., Vol. 13 (2019), Issue 10, pg(s) 430-432

    The agricultural industry is growing very quickly. Large areas of fields make tractors work at higher speeds, with which they also move on public roads. Except acceleration, the agricultural tractor must also be stopped. There are emergency situations on the roads that require sudden braking, and therefore a quick stop of the vehicle. Drum brakes are used in most farm tractors. They contain a friction pair (shoes and drum) which as a result of cooperation changes the kinetic energy of the motion into thermal energy. Unfortunately, this crates huge amount of this energy. This can cause overheating of the friction lining, which can lead to permanent damage. This paper presents the results of simulation tests of the heating process during single emergency braking. It has been shown that in some situations the temperature can reach a higher value than that which is safe for friction material components.

  • ENERGY SAVING IN THE HYDRAULIC CIRCUIT FOR AGRICULTURAL TRACTORS: FOCUS ON THE POWER SUPPLY GROUP.

    Machines. Technologies. Materials., Vol. 9 (2015), Issue 8, pg(s) 35-41

    This work aims to analyze a complete hydraulic system of a medium size agricultural tractor, in order to perform an energy dissipation analysis and to suggest possibly alternative configurations and solutions. The fuel consumption and energy dissipation in off road vehicles have in fact become a key feature, given the great attention devoted to the need of reducing pollutant emissions, in order to satisfy the future emission limits. In this work the focus is on the fluid power supply group and the standard architecture of this unit has been compared with an alternative solution, called variable pump margin strategy and compared on the basis of the power consumption to perform the same duty cycle, showing that a relevant percentage of energy may be saved with simple modifications in the hydraulic power generator group.

  • METHODOLOGICAL APPROACH FOR ASSESSMENT AND OPTIMIZATION OF AGRICULTURAL TRACTORS’ PERFORMANCES

    Mechanization in agriculture & Conserving of the resources, Vol. 59 (2013), Issue 1, pg(s) 6-10

    A methodological approach has been developed that allows to assess the performance and functional possibilities of systems, assemblies and mechanisms of the agricultural tractor taking part in the formation and implementation of its power potential and, if necessary, to determine requirements for modules with similar purposes by which they could be replaced in order to improve efficiency in the operation of а tractor model and machine-tractor combinations formed on its basis.

    An example of practical application of the methodological approach for improving the utilization of power potential of an agricultural tractor by optimizing its ballast is presented in the article, too.