For as long as possible to maintain in good condition bearing the original performance of the required maintenance, overhaul, in order to accident prevention in the first place, to ensure reliability of operation, and to improve the productivity, economy. Best maintenance the corresponding mechanical operation conditions operating standards, regular basis. The content includes monitoring the operation state, the supplement or replace the lubricant, a periodic disassembly inspection. As the the maintenance matters operation, rotation of the bearing sound, vibration, temperature, state of the lubricant, etc..

First, the cleaning of the bearing

Removing the lower bearing overhaul, the appearance of the bearing is first recorded to confirm the remaining amount of lubricant, lubricant sample check, wash bearings. As a cleaning agent, general use gasoline, kerosene.

Remove the bearing cleaning, coarse cleaning and fine cleaning, respectively, on the container, put the metal mesh bottom, bearing no direct contact with the dirt of the container. Coarse cleaning, if the bearing rotation, with dirt will damage the bearing rolling surface, it should be noted. Crude oil cleaning, use a brush to remove grease, adhesive material, generally clean, transferred sperm washing.

Sperm washing is the bearing while rotating in the cleaning oil, cleaning it thoroughly. In addition, cleaning the oil should be kept clean.

Bearing maintenance and judgment: In order to determine whether the removed bearing can be used to check the bearing clean. Check the raceway, the raceway, with the surface state of the cage wear, increased bearing clearance and of irrelevant dimensional accuracy decline damage exception. Non-separable type of small ball bearings, the inner ring with one hand, the level of support, rotating outer ring to confirm whether smooth.

Tapered roller bearings and other separation-shaped bearings, rolling elements, the outer ring raceway surface were examined.

The large bearing because they can not hand rotation, pay attention to check the rolling element and raceway, to maintain the appearance of the rack, wall surface, the importance of bearing the higher the greater the need for careful inspection.

Second, the bearing lubrication

The purpose of the bearing lubrication:

Lubrication of rolling bearings aimed at reducing internal bearing friction and wear, to prevent burning stick, its lubrication utility is as follows.

(1) to reduce friction and wear.

Mutual contact portions constituting the bearing rings, rolling elements and cage, to prevent metal-to-metal contact, reducing friction and wear.

(2) to extend the fatigue life.

Rolling bearing fatigue life, in rotation, good lubrication of rolling contact surface is extended. On the contrary, the viscosity of the oil is low, the thickness of the lubricant film is good, is shortened.

(3) discharging the heat of friction, cooling.

Cycle oil law and oil discharge heat generated by friction or heat coming from the external cooling. Prevent bearing overheating prevent the lubricant own aging.

(4) Others: It is also to prevent foreign material from entering the interior of the bearing, or to prevent rust, corrosion effect.

Lubrication methods:

Bearing lubrication, grease and oil lubrication. In order to make a good bearing play function, first, to select suitable conditions, the use of the purpose of lubrication method. If only consider lubrication, oil lubrication dominant. However, the grease around the bearing structure of expertise can be simplified, compare the pros and cons of grease and oil lubrication.

Third, the installation of the bearing:

Bearing installed correctly, affecting the accuracy, longevity, performance. Therefore, the design and assembly departments installation of the bearing to be adequately studied. I hope to be installed in accordance with operating standards. Operating standards projects usually are as follows:

(1) Cleaning bearings and related parts;

(2) Check the connected components of size and finishing;

(3) Installation;

(4) Install the bearing check;

(5) supplying lubricant.

I hope shortly before installation, just open bearings packaging. General grease lubrication, cleaning, filling the grease directly. Lubricating oil, Common also do not have to clean, however, the instrument used or the use of high-speed bearings, etc., use of clean oil washed to remove the anti-rust agent coated on the bearing. Remove the bearing of rust inhibitor, rust, and so can not be placed regardless. Furthermore, the grease-enclosed bearing, used directly without cleaning.

The method of installation of the bearing, due to the bearing structure, with the condition varies, ships, since the multi-axis rotation, the inner ring needs interference fit. Cylindrical bore bearings, multi-purpose pressed into the press, or hot charging method. Taper occasions, installed directly on the taper shaft or sleeve installation.

Usually clearance fit when mounted to the housing, the outer ring with the amount of interference, usually pressed into the press or shrink fit method installed after the cooling. With a dry ice as coolant, shrink fit the occasion of the installation, the moisture in the air condenses on the surface of the bearing. So, you need the appropriate anti-corrosion measures.