With the help of site material components and mechanical theory

taking the power steering device rocker shaft bearing of Dongfeng truck as study object

the analysis and study of it is carried out.Through the force analysis and calculation on rocker shaft bearing

the theoretical guidance for the design of rocker shaft bearing is proposed as follow:Both ends of the rocker arm shaft support bearing force is not the average allocation.The long end bearing force is far greater than the short.When the two ends of the rocker arm shaft bearing force has maximum and minimum condition

the long end bearing force is increased and the short end bearing force is decreased in the angle

but it is unlikely to change greatly.The bearing can be calculated according to the intermediate position.In the design of the rocker axle bearing

it makes the structure compact characteristics into full play that the long end bearing size is longer than the shorter.So shaft neck size corresponding to the rocker arm shaft head end is larger than that of the short.It provides the basis for the power steering device rocker shaft bearing quality of automobile carrier.And it also provides the improvement direction of the power steering device work efficiency.