Install needle bearing notes

 backing bearings clearance is defined as a case of a fixed ring , another ring in the radial or axial flow by the maximum amount , the clearance is divided into radial clearance and axial clearance two kinds . Move needle bearing assembly, the clearance is not too big, not too small . Clearance is too large , it will cause the load to move the body to withstand the reduced number of individual load increases to move the body , thereby reducing the accuracy of rotation of the bearing , reducing the service life ; clearance is too small, the friction will increase , the heat generated increases, increased wear , also can reduce bearing life . Therefore, the bearing assembly must strictly control and adjust the clearance.
Roller bearing  temperature causes are: oil quality does not meet the requirements or deterioration, lubricant viscosity is too high ; institutions assembly too tight ( lack of space ) ; bearing assembly tight ; bearing ring on the shaft or housing rotation ; overload large ; bearing cage or rolling fragmentation .
1) , the shaft and housing bore roundness and the vertical shoulder block bearing according to the appropriate precision requirements.
2) , it is necessary to accurately calculate the rotating rings fit the amount of interference , but also suitable for accurate calculation of the amount of the fixed ring . Rotating rings blanch the amount of interference to the extent possible should also get smaller . As long as the operating temperature and ensure the effect of thermal expansion , and the maximum speed of the centrifugal force , resulting in a tight fit so as not to creep or sliding surfaces . Fixed ring size according to the work load and bearing size, select small clearance fit or interference fit , too loose or too tight is not conducive to maintaining the original shape exactly .