Performance and installation of zinc alloy bearings

Zinc alloy bearings are a type of bearing unit that combines rolling bearings with bearing seats. Most outer spherical bearings are made of spherical outer diameter and installed together with imported bearing seats with spherical inner holes, with diverse structural forms, good universality and interchangeability. Zinc alloy bearings also have a certain degree of self-alignment in design, are easy to install, and have a dual structure sealing device that can work in harsh environments. The bearing seat is generally cast into shape. Commonly used seats include vertical seat (P), square seat (F), convex square seat (FS), convex circular seat (FC), diamond seat (FL), circular seat (C), slider seat (T), etc.

Installation method 1: Pressing fit: When the inner ring of the bearing is tightly fitted with the shaft, and the outer ring is loosely fitted with the bearing seat hole, a press can be used to first press the bearing onto the shaft, and then install the shaft and bearing together into the bearing seat hole. When pressing, a soft metal material assembly sleeve (copper or soft steel) is placed on the end face of the bearing inner ring. The outer ring of the bearing is tightly fitted with the bearing seat hole, and the inner ring is loosely fitted with the shaft, The bearing can be pressed into the bearing seat hole first, and the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly matched with the shaft and seat hole, the installation of the inner and outer rings should simultaneously press into the shaft and seat hole. The structure of the assembly sleeve should be able to simultaneously press the end faces of the bearing inner and outer rings

Method 2: Heating fit: By heating the bearing or bearing seat and using thermal expansion to convert a tight fit into a loose fit, it is a commonly used and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before hot installation, the bearing or separable bearing sleeve is placed in the oil tank and evenly heated at 80-100 ℃. Then, it is taken out of the oil and installed on the shaft as soon as possible to prevent the inner ring end face and shaft shoulder from not fitting tightly after cooling, The bearing can be tightened axially after cooling. When the outer ring of the bearing fits tightly with the bearing seat made of light metal, the hot installation method of heating the bearing seat can avoid the scratch of the fitting surface. When heating bearings with oil tanks, there should be a grid at a certain distance from the bottom of the box, or a hook should be used to hang the bearing. The bearing should not be placed on the bottom of the box to prevent impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank, and the oil temperature must be strictly controlled to not exceed 100 ℃ to prevent tempering effect and reduce the hardness of the ring