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Installation method of Installation method of INA cylindrical roller bearings

wallpapers Tech 2020-06-19
INA cylindrical roller bearings installation method: When using a tight fit inner ring, the installation method depends on whether the bearings is a straight hole or a tapered hole. Then install the lock washer and lock nut or clamping end cover in order to fix the INA bearing on the shaft shoulder. After the bearing gradually cools, when the outer ring of the tightening lock nut or clamping end cover rotates, it should be For tight fit, the bearing housing can be heated to expand to complete the installation. The oil bath method is shown in Figure 10. Bearings should not be in direct contact with heat sources. A common method is to place an isolation net a few inches from the bottom of the tank, and use a small support block to separate the isolation net from the bearing model. The bearing must be away from any high-temperature heat sources nearby to prevent the bearing temperature from overheating. The high hardness leads to a decrease in the hardness of the bearing ring.
Flame heating is usually used. It is best to use automatic temperature control equipment. If safety regulations prohibit the use of open hot oil baths, a 15% soluble oil-water mixture can be used. This mixture can be heated up to 93°C, and it will not produce flames. Straight hole bearing thermal expansion method Most applications require the shaft to adopt an interference fit to heat the bearing to expand it enough to easily slide in along the journal. Two methods of heating are usually used for easy installation:-Hot oil tank heating-Induction heating The first method is to place the bearing in hot oil with a high flash point. The temperature of the heated oil cannot exceed 121°C, and 93°C in most applications It is enough to heat the bearing for 20 or 30 minutes, or until it expands enough to slip into the journal easily. You can use induction heating to install the bearing. The induction heating process is very fast, so special care must be taken to prevent the temperature from exceeding 93°C. It is usually experimental. Heating operation, in order to grasp 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, the bearing should be vertically held against the shoulder and fixed until it cools.
The bearing of the thermal expansion method is insulated by the bottom and the lubricating oil bearing support block is heated by the flame. Do not use steam or hot water to clean the bearing, otherwise it will cause rust or corrosion. Do not heat the bearing surface by flame. Bearing heating should not exceed 149°C (300°F). WARNING Before heating the parts, please remove the oil or anti-rust agent to avoid fire and thick smoke. CAUTION Failure to observe the following warning messages may result in serious personal injury or death. The wrench punching method is usually used as an optional installation method for small-size bearings. It is to press the bearing onto the shaft or the bearing seat. This method requires an arbor press and a mounting sleeve, as shown in Figure 11, the mounting sleeve should be made of mild steel, the inner diameter should be slightly larger than the diameter of the shaft, and the outer diameter of the mounting sleeve should not exceed timken.com/catalogs The diameter of the shaft shoulder 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 need to 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. If the outer ring is tightly fitted into the bearing seat, install the tube The outer diameter should be slightly smaller than the inner diameter of the bearing housing. The inner diameter cannot be smaller than the bearing seat abutment diameter recommended in the Timken® Spherical Roller Bearing Selection Guide (Order No. 10446C) on timken.com/catalogs. Apply light engine oil to the shaft to reduce the pressure on the tight fitting The required force carefully installs the bearing on the shaft and ensures that it is perpendicular to the centerline of the shaft. A steady pressure is applied by the lever to make the bearing firmly against the shaft or the shoulder of the bearing seat.

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