off the dynamic load effect for the synthesis of radial load vector bearing ring raceway of along the circumferential direction of the rotation, are borne by the various parts of the various parts of the raceway, and accordingly passed to the shaft casing hole appearance. This is called off load dynamic mobile crane bearing load, also called cyclic loading. Off the unique local dynamic load is relative to the rotating synthetic radial load vector and the ring. Take off the reproduced bearing ring and shaft or housing holes should choose clearance or interference fit. Synthesis of radial load vectors to the bearing ring raceway in the ring within a given area relative rocking, undertaken slewing rings for the raceway certain region, and transmitted to the shaft or housing bore the appearance of certain region, or the effect is used for load bearing is the impact load, oscillating load, the the loading direction or digital often changes, the load is called rocking load, also called truck mounted crane bearing not the direction of load. Bearing rocking load, especially in the bear the heavy shoulder the burden, inside and outside the circle of which shall be deemed appropriate and use the interference fit. The inner rocking rotation, general inner ring that uses off the dynamic load. 
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