In case of emergency braking, the safety factors of the three parts of the rear axle leaf spring, the joint between the axle head and the axle body and the inner bearing are close to or greater than 4, so the rear axle is firm Under braking conditions, the safety factor of the joint between the leaf spring head and the axle body and the three parts of the inner bearing is less than 4 when the heavy semi-trailer passes through the uneven road surface, but because the trailer has higher requirements on the road surface quality and chooses a larger dynamic load factor, it is still strong enough. When the heavy truck bears the maximum lateral force, the bending force of the two parts close to the inner bearing is less than The ultimate force of the head material and the shear force at the bearing journal are less than the allowable shear force, so the strength is enough under normal working conditions<br>
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