Installation method of TIMKEN cylindrical roller bearings
Installation method: When using a tight fit inner ring, the installation method depends on whether the bearing is a straight bore or a tapered bore. Then install the lock washer and lock nut or clamp the end cover to fix the bearing on the shaft shoulder. After the bearing is gradually cooled, tighten the lock nut or clamp the end cover and the outer ring of the end cover rotates. It should be in contact with the bearing seat. A tight fit, heats the housing to expand to complete the installation. The oil bath method is shown in Figure 10. The bearing should not be in direct contact with the heat source. A common method is to place an isolation net several inches from the bottom of the oil tank, and use a small support block to separate the isolation net from the bearing model. The bearing must be kept away from any nearby high temperature heat sources to prevent the bearing from overheating. high, resulting in a decrease in the hardness of the bearing ring. Flame heating is usually used. It is best to use an automatic temperature control device. If safety regulations prohibit the use of an open hot oil bath, a 15% soluble oil-water mixture can be used. This mixture can heat up to 93C without flames Mounting straight bore bearings Thermal expansion method Most applications require the shaft to be heated with an interference fit to expand the bearing enough to easily slide down the journal and it can be done easily Two heating methods are commonly used for installation: - Hot tank heating - Induction heating The first method is to place the bearing in hot oil with a high flash point The oil temperature cannot exceed 121C, 93C is sufficient for most applications The bearing should be heated 20 or 30 minutes, or until it expands enough to slip easily into the journal Bearings can be installed using induction heating Induction heating is a quick process, so special care must be taken to prevent temperatures from exceeding 93C A trial heating operation is usually required to master the correct heating Time According to the fixed melting temperature of the wax, the temperature of the bearing can be measured. After the bearing is heated, make sure that the bearing is perpendicular to the shoulder and fixed until it cools. The thermal expansion bearing is supported by the isolation net from the bottom of the lubricating oil bearing support block and heated by flame. Do not use steam or hot water to clean the bearing, otherwise it will cause rust or corrosion. Do not heat bearing surfaces on flames. Bearing heating should not exceed 149°C (300F). WARNING Before heating parts, remove the oil or rust inhibitor on them to avoid fire and smoke. NOTICE Failure to observe the following warnings could result in serious personal injury or death. Wrench stamping is an optional mounting method often used for small size bearings, by pressing the bearing onto the shaft or into the housing. This method requires an arbor press and a mounting socket, as shown in Figure 11. The mounting socket should be made of mild steel and the inner diameter should be slightly larger than the diameter of the shaft. The outer diameter of the mounting socket should not exceed that on timken.com/catalogs Shaft shoulder diameters given in the Timken Spherical Roller Bearing Catalog (Order No. 10446C). Both ends of the mounting sleeve should be vertical, the inner and outer surfaces should be thoroughly cleaned, and the sleeve should be long enough to ensure that the end of the sleeve is still longer than the shaft end after the bearing is installed. The outside diameter should be slightly smaller than the inside diameter of the housing. The inside diameter must be no smaller than the diameter of the housing shoulder recommended in the Timken Spherical Roller Bearing Selection Guide (Order No. 10446C) at timken.com/catalogs Install the bearing carefully on the shaft with the required force, and make sure it is perpendicular to the centerline of the shaft. Apply a steady pressure from the hand lever so that the bearing firmly rests on the shaft or bearing housing shoulder.