Although the structure of needle roller bearing with stamping outer ring is different from that of general bearing, its installation method is basically similar to that of other kinds of bearings, which need to be completed by using auxiliary sleeve. In the process of installation, the main function of the auxiliary roll or sleeve is to hold the needle, so that the needle does not fall out; at the same time, the journal lifts the needle with its own chamfer. As the needle roller bearing of stamping outer ring moves slowly inward on the journal, the auxiliary roll or sleeve withdraws slowly until it is installed to the working position.
In order to accurately install the needle roller bearing of stamping outer ring, the diameter of the auxiliary roll and sleeve should be 0.1-0.3 mm smaller than the diameter of the shaft. During installation, the inner surface of the outer ring of punched needle roller bearing is coated with grease, and the needle is placed close to the inner surface; then the auxiliary roll or sleeve replacing the journal or inner ring of bearing is pushed into the outer ring hole, and the end face of the needle roller is aligned with the end face of the mounted shaft or the inner ring of bearing installed on the shaft, and then the pressure is applied by knocking with a press or a hammer.
For those needle roller bearings without inner ring or outer ring, the rolling surface of the shaft or shell hole can be coated with a thin layer of grease before installation, and the needle can be attached to the grease at the installation site in turn. It should be noted that there should be clearance when placing the last needle roller. The clearance should be 0.5mm on the circumference of stamping needle roller bearing.
At the same time, remember that the last needle can not be squeezed or fewer needles, because the pressing needle roller bearing of outer ring will be stuck and can not rotate during the hard extrusion, and if fewer needles are installed, the clearance will be too large, which will easily cause the needle to twist and break when the bearing is running.
In addition, for the needle roller bearing with stamping outer ring only, because the outer ring wall is very thin, do not use hammer to knock the installation, press should be used to press in. Because the pressure is not uniform when hammer strikes, it is easy to cause local deformation of the outer ring of needle roller bearing with stamping outer ring.
