How to install the full complement needle bearings?

Precautions for installation of full complement needle bearings

Installation of full complement needle bearings, usually with auxiliary sleeves. At this time, the auxiliary roller or auxiliary sleeve holds the needle roller to prevent the needle roller from falling out, and the journal lifts up the needle roller with its own chamfer. As the full complement needle bearings slowly move inward on the journal, the auxiliary The roller or auxiliary sleeve is slowly withdrawn until it is installed in the working position.

The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the shaft diameter. When installing, first coat the inner surface of the outer ring of the full complement needle bearings with grease, and place the needle roller close to the inner surface (a gap should be left when placing the last needle roller), and then replace the journal or the inner ring of the bearing. The auxiliary roller or auxiliary sleeve is pushed into the outer ring hole, and its end face is aligned with the end face of the installation shaft or the end face of the inner ring of the full complement needle bearings already installed on the shaft, and then tapped with a press or a hand hammer to apply pressure.

Full complement needle bearings can also be installed in this way, that is, apply a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve and insert it into the outer ring of the bearing, so that the auxiliary sleeve and the outer ring of the bearing form an annular hole, and then install the needle roller in the annular hole . After the needle roller is installed, the auxiliary sleeve can be pushed out with the working shaft.

For full complement needle bearings without inner ring or outer ring, when installing, first apply a thin layer of grease to the rolling surface of the full complement needle bearings or the housing hole, and put the needle rollers against the mounting position in turn. on the grease. There should be a gap when placing the last needle roller, and the size of the gap should be 0.5mm on the circumference of the needle roller bearing. Do not squeeze the last needle into it, or install one less needle, because the full complement needle bearings will be stuck and cannot be rotated when the needle is squeezed; The needles twist and break when the bearings are running. For needle roller bearings that only have a drawn outer ring, because the outer ring wall is very thin, do not hit and install with a hand hammer, but use a press to press in. Because the pressure is uneven when the hand hammer hits, it is easy to cause local deformation of the outer ring of the needle roller bearing.

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