Akademik Veri Yönetim Sistemi
JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, cilt.28, sa.4, 2025 (ESCI)
In road vehicles, the speed or torque of the rotational motion transferred from the engine to the gearbox is changed at different rates according to road conditions and transmitted to the differential. When the speed or torque of the rotational motion is needed to change, different gears must be interlocked. In order to interlock two gears, their peripheral speeds must first be equalized. This process is called synchronization and the mechanisms that perform the synchronization are called synchromeshes. Synchromeshes are mechanical systems that eliminate the angular speed difference between the frictional components by converting kinetic energy into heat through friction. In this study, initially, the design of a gearbox mechanism providing four forward and one reverse speed changes was performed. It was decided to use a single-ring synchronization mechanism with a radius of 36 mm in the mechanism. It was determined that a harmonic force function with a peak value of more than 300 N should be applied to such a friction ring. Such a large force can only be provided by a synchronization mechanism with a damper. After that, a mathematical model of a damperical synchronization mechanism was established and dimensions of synchronization mechanism were determined. During dimensioning, it was assumed that the speed of the counter shaft gear was reduced from 2400 rpm to 1263 rpm, the total mass moment of inertia of the decelerating elements was 0.00508 kgm(2) and the shift was made from the first to second gear. When the damping constant is taken to be 14000 Ns/m the designed synchronization mechanism can perform the gear shifting within 0.25-0.35 s by creating a friction torque of around 4-4.5 Nm. It is seen that the designed mechanism can eliminate the need for multiring synchronization mechanisms and blocking ring mechanisms used in existing gear mechanisms.