Installation Of Needle Roller Bearings

What is needle roller bearing
Needle roller bearings are roller bearings with cylindrical roller, relative to its diameter, the roller is thin and long.This type of roller is called a needle roller.

Points for attention when using needle roller bearings
Needle roller bearing has a large bearing capacity and is suitable for mounting the supporting structure with limited size. The surface of the journal is hardened as the rolling surface, and the bearing is loaded into the seat hole with pressing fit, and there is no need to position it axially.Bearings should be injected with appropriate amount of grease before installation, usually, after assembly, no more lubrication type bearings used in the journal without protruding end of the support, end face closure plays a sealing role, and can withstand small axial swimming.

Installation of needle roller bearings
The installation of a full load needle roller bearing is usually carried out using an auxiliary sleeve.At this time, the auxiliary roller or auxiliary sleeve holds the needle roller to prevent it from falling out, and the journal lifts the needle roller with its own chamfering. As the needle roller bearing slowly moves inward on the journal, the auxiliary roller or auxiliary sleeve will slowly withdraw until it is installed to the working position.At this time, it should be noted that the outer diameter of the auxiliary roller and auxiliary sleeve should be smaller than the diameter of the shaft.During installation, the inner surface of the outer ring of the bearing should be coated with grease first, and the needle should be placed close to the inner surface. A clearance should be left when the last needle is placed.Then the auxiliary roller or auxiliary sleeve instead of the journal or bearing inner ring is pushed into the outer ring hole, and its end face is aligned with the end face of the mounting shaft or the end face of the bearing inner ring installed on the shaft, and then the pressure is exerted by beating with a press or a hand hammer.Needle roller bearings can also be installed in this way, that is, the outer diameter of the auxiliary sleeve is coated with a thin layer of lubricating oil, and the outer ring of the bearing is sleeve, so that the auxiliary sleeve and the outer ring of the bearing form an annular hole, and then the needle roller is installed in the annular hole.After installing the needle roller, push the auxiliary sleeve out with the working shaft.For needle roller bearings without inner ring or outer ring, when installing, the rolling surface of the shaft or shell hole can be coated with a thin layer of grease, and the needle can be attached to the grease of the installation part in turn.The last needle should be placed with a gap.Do not hard squeeze the last needle roller into it, or one less needle roller, because the bearing will be stuck and cannot rotate during hard squeeze;If the clearance is too large, it is easy to cause the needle to twist and break when the bearing is running.For needle roller bearings with only the outer ring pressed, because the outer ring wall is very thin, needle roller bearings should be installed by hammering, and press should be used.Because the pressure is not uniform when the hand hammer is beating, it is easy to cause local deformation of the outer ring of the needle roller bearing.
Cause of damage of needle roller bearing
In general, needle roller bearing damage is caused by fatigue damage, poor lubrication, contaminants entering the bearing or improper disposal of equipment.Dust cleaning bearings and the surrounding environment, invisible to the naked eye fine dust is a powerful killer of bearings, it can increase the wear, vibration and noise of bearings.Stamping in the use of equipment to form a strong stamping, it is very likely to lead to needle bearing damage or the use of hammer directly hit the bearing, through the rolling body transfer pressure.The impact of the installation of non-professional tools With suitable, accurate equipment, you can try to avoid the use of things like cloth and staple fibers.Needle roller bearings whether in the laboratory test or in practical use, it can be clearly seen that the appearance of the same needle roller bearings under the same operating conditions, the actual life of the needle roller bearings is very different.
The price of needle roller bearings
The price of needle roller bearings is affected by many factors such as market, material and quotation. If you want to know the specific price of needle roller bearings，please contact us to make enquiries.
Supplier of needle roller bearings:BMB Bearings
BMB Bearings is the complete one-stop supplier of OEMs and wholesalers purchasing high-precision, miniature ball bearings, industrial ball bearing related products, as well as related professional services, including world-class engineering and design. If you have any need, please feel free to contact us .