Bearing Support Reaction of Vehicle Gear Drive System

Bearing is the main component connecting the gear drive system and the box. Under the action of bearing support reaction, the box will be deformed, which will affect the stability and safety of the gear drive system to a certain extent.The bearing support reaction calculated by dynamic model simulation can provide boundary conditions and objective functions for bearing strength checking and bearing position optimization.

The maximum support reaction of each bearing under 1-8 gear is shown in the figure.It can be seen from the diagram that different clutches and brakes in different gears have different splitting states, which results in different transmission routes of torque, thus resulting in large differences in the forces of each bearing.

Due to the power shunt characteristics of planetary drive, bearing 1 and bearing 2 are located on the drive shaft which contains two stages of planetary drive, so bearing 1 and bearing 2 have the least force.The bearings on the drive shaft where the shaft gears are located are generally stressed heavily.At the same time, under gear 1-4, the maximum support reaction of each bearing is significantly greater than that of each bearing under gear 5-8 because of the large torque transmitted by the gear drive system.

The dynamic engagement force between fixed shaft gears G1 and G2 in 1st gear is 314kN and the bearing No. 9 is the closest to the loaded gear, so the bearing force reaches the maximum.Among the other bearings, bearings No. 5, No. 6, No. 7 and No. 10 are the most stressed bearings, with the maximum support reaction of 155 kN, 195 kN, 120 kN and 188 kN in turn.