The subject of this thesis is a sequential gearbox of a BMW K1200 S motorcycle. The gears are engaged by pushing the pin of a spur gear axially into the groove of a free-moving gear, thereby connecting it to a shaft in the gearbox. For one arbitrarily selected gear, contact stresses for engaging the gear were calculated using the finite element method. The clutch lever on the handlebar must be pressed to engage the gear. This causes a difference in angular velocity in the gearbox between the spur gear and the free-running gear. The spur gear rotates due to the inertia of the rear wheel of the motorcycle, while the freewheeling gear rotates with the angular velocity of the engine. Due to these differences in angular velocity, force is generated between the pinion and the pinion groove, when the gear is engaged. This force and contact stress were calculated by explicit dynamic finite element simulation for second gear of the gearbox. Before the simulation, we determined the gear ratios, estimated the mass of the transmission elements, and obtained the other missing data needed for the calculation. We then created a simplified model of the gearbox and fed it into Abaqus, where we ran the simulation
|