Mobility and Vehicle Mechanics

19-25

Authors: Igor Saveljić, Slavica Mačužić, Nenad Filipović

Seat belts in vehicles, for many years, have the task to reduce the level of injuries that can occur during traffic accidents. Although the number of children who die in traffic accidents decreasing, there are still some parents who incorrectly associated children to their seats. The most common injuries that occur in children are cervical spine fractures and lumbar spinal dislocations. We studied the correct and incorrect way binding belt child in the back seat. The three-dimensional model of lumbar spine (segment L4-L5) has been developed and analysed. The model consisted of two vertebral bodies and one intervertebral disc. Numerical solutions of von Misses stresses and displacements, occur as a result of vehicle crash, are calculated and analysed. With computer manipulation it is possible to simulate the behaviour of lumbar spine, and this may help to better understand the mechanical and physical characteristics this part of the body.

39-55

Authors: Slavica Miladinović, Lozica Ivanović, Mirko Blagojević, Blaža Stojanović

The gears, where the power and torque transmissions are performed with no contact and with help of the magnetic forces, are called magnetic gears. With this gears, unlike the mechanical gear transmissions, there are no noise, vibrations and friction, so therefore, there is no need for lubrication and maintenance costs are considerably lower. Two basic types of magnetic gears are: converted and magnetic gears with variable magnetic field. Magnetic gears are made of iron, boron and neodymium alloy, which allows to obtain a permanent magnet for maximum power magnetisation. This paper shows the outline of the magnetic gear development, their classification and characteristics, where the gear ratio and torque density are the most important. Also, the examples of application of magnetic gears in automotive and transportation industry are given in the paper.