Roller bearing is an important component of their choice whether it is appropriate, the pros and cons related to the quality of life of idlers. In the tape machine running, roller's speed is higher, mainly radial force, but bear certain axial force. Based on the above characteristics and roller costs, actual production in general use deep groove ball bearings. For example, the 305 manufacturing precision bearings for the G-class, clearance for the basic group, the cage generally use low-carbon steel stamping. The high roller bearings on both ends of concentricity and axial bearing requirements, the inner ring and the shaft using a transition or a small amount of interference with the actual operation, roller noise, cage rust.

Some adopt 4G305 roller bearing, the bearing manufacturing precision is G-rated, clearance for the fourth auxiliary group, pressed steel cage. Because the clearance is large, the operation of reducing jamming in the manufacture of concentric rollers allow a certain deviation, the bearing inner ring and the shaft may also be a large amount of interference.

Part of the roller using 305KA bearings, these bearings are also manufacturing precision G level, close to the bearing clearance and 4G305, nylon cage, nylon cage. Nylon cage with light weight, corrosion resistance, low coefficient of friction, wear resistance and other advantages. But its carrying capacity is poor.

Due to the use of the environment than the harsh downhole roller recommended 4G305-type or 305KA deep groove ball bearings.

Excessive wear is the main failure mode of rolling bearings, and improper lubrication, improper lubricant varieties or ingredients is one of the key factors causing excessive wear. Therefore, the choice of rolling bearing lubrication, a lubricant must attach great importance to Variety. Rolling lubricant used is divided into three categories, namely oil, grease and a solid lubricant, grease which is most widely used. Idlers its limitations and conditions of use requirements of the structure, the general grease lubrication. Mine commonly used grease has three categories: calcium-based grease, sodium grease and lithium grease.

Commonly known as calcium-based grease with butter, is the first to use fat, low prices, good water resistance, water resistance in general, applies to the following 60-80 ℃ temperature, and some varieties of temperature up to 120 ℃, but prices did rise, poor heat resistance, can not be heated to melt the use, in order to avoid deterioration.

Sodium based grease temperature higher than calcium-based, the performance is similar with calcium-based, but it's poor water resistance, suitable for dry working environment.

Lithium grease has excellent ground shear stability, good water resistance, corrosion resistance, oxidation resistance and good wear resistance and resistance to stress, while the drop point up to 190 ℃ or higher, the friction lower than the average coefficient of fat, allowing the bearings have higher operating speed. The high price of lithium grease, it can not be mixed with other lipids.

Due to underground moisture, moisture large, roller bearing lubrication best use of lithium or calcium grease.