1, fixed at both ends
Short axis (span under the normal operating temperature < 400 mm) can be used in the form of a simple unidirectional fixed at both ends of.Both ends fixed bearing generally has a symmetrical arrangement of angular contact ball bearing or tapered roller bearing. When installation, axial bearing of a ring, until you get the appropriate clearance or required pre-load.
2, fixed at one end, end winding
When the shaft is longer or working temperature is higher, because of the large scale, appropriate chooses fixed at one end, the end winding form, guaranteeing the free expansion shaft. (can eliminate the effects caused by heat bilges cold shrink and damage.)Due to the manufacturing error, is supported by two radial bearing of the shaft center distance and the center distance of the bearing is usually not completely equal, work also can make the distance change, the rise of temperature bearing so need to walk to compensate for this error.N and swimming NU type cylindrical roller bearings are the ideal bearing, this kind of bearing roller and cage in the bearing no guard ring raceway in mobile. Other types of bearings in only one ring was a loose fit to swim as bearings, such as deep groove ball bearing and spherical roller bearings.
3, swimming at both ends
Without axial positioning closely axis choose swimming on both ends of the support is a very economic method.Asked about two-way winding shaft, can be used on both ends of winding shaft structure, such as on the herringbone gear axis. Due to the effect of the axial spacing of the itself, their bearing and axial fixation of inside and outside the circle should be designed to ensure that only a shaft relative stand have a fixed axial position, and the other oneTwo bearings on the shaft must be swimming, in order to prevent the jammed or herringbone tooth on either side of the force is not uniform. The bearing is not affected by the axial force on both ends.Deep groove ball bearings, self-aligning ball bearing and spherical roller bearing is the most suitable for swimming bearings. One of two of these bearing ring (usually outer ring) with the axial movement is allowed. Tapered roller bearings, angular contact bearing is not suitable for swimming in coarse unqualified, because they must be carried outAdjustments to ensure can also turn to normal.
