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Bearing installation method
Bearing installation: According to the structure type of the bearing, and the conditions of the shaft and the bearing seat and the installation conditions, the corresponding bearing installation method is formulated. One principle is that during the entire installation process of the bearing, the rolling elements of the bearing must not be stressed. . The inner ring of the bearing and the shaft are generally fitted with an interference fit, while the outer ring bearing is fitted with a clearance. The following types are commonly used for mounting the bearing on the main shaft: 1. Using a hand hammer and a sleeve, this method is often used for bearing sleeves. The circle size corresponds. The inner diameter of the sleeve for the inner ring should be slightly larger than the diameter of the main shaft, and the outer diameter of the outer sleeve should be slightly smaller than the diameter of the bearing seat. It is not allowed to hit the outer ring of the bearing when installing the inner ring of the bearing. This will transmit the hammering force to the other ring through the rolling element and the raceway, resulting in damage to the raceway and the rolling element. If the inner and outer rings of the separate bearing are tightly fitted with the journal and the hole, the end face of the sleeve needs to be in contact with both the inner and outer ring end faces, and the end face of the sleeve must be flat and perpendicular to the center line of the sleeve. When using a hand hammer to strike the sleeve to install the bearing, on the one hand, the bearing is not stable, and on the other hand, the bearing has impact force. Therefore, unless the conditions are limited, it is generally not recommended to use this method when installing the bearing. 2, the use of pressure devices, this installation method used pressure devices are mainly presses, presses, hydraulic nuts, etc., is a feature of the modified method is that the bearing will not be directly hit, so the bearing is not susceptible to damage, but use this This method must ensure that the pressure line coincides with the axis of the bearing to prevent the bearing from tilting. 3, The use of hot hair, when the bearing with a large amount of interference, the use of pressure means is difficult to install the bearing, but also easy to damage the bearing with the surface. Therefore, if the bearing inner ring is heated and inflated, the bearing will easily fit into the main shaft. At present, a magnetic induction heater is often used to heat the inner ring of a bearing during hot loading. The internal heat temperature of the bearing should not exceed 120 degrees Celsius. The specific point heating temperature depends on the size of the bearing inner ring and the amount of interference. As the bearing is heated, the size of the outer ring of the bearing also becomes wider. After the bearing is cooled, the axial clearance of the bearing shoulder should be eliminated by using a nut or other suitable method. The shaft has an interference fit. Therefore, when using hot loading, after the bearing is cooled, use a nut or other suitable method to eliminate the axial clearance of the bearing shoulder. 4, Inject pressure oil between the mating surfaces. When the interference between the shaft and the bearing, the friction between the mating surfaces is large. When the interference is large, the mating surface may also be damaged. If the pressure oil is injected between the mating surfaces, the two mating parts will be slightly deformed, and the pressure oil will penetrate into the mating surface to form a layer of lubricating oil film, which can greatly reduce the friction between the mating surfaces. This allows the two mating parts to slide relatively with less force. This method is applicable to the installation of the conical surface fittings and to the assembly and disassembly of the cylindrical surface fittings.