Four mounting techniques for bearings

Although bearings are often encountered, many people do not know what the bearing installation skills are. This method of bearing installation may be introduced in many videos now, but we have to use different bearings and bearings. In different places, bearing installation methods are different.

Tip 1. Use copper rods and manual hammering to install

This is an easy way to install small and medium-sized bearings. When the inner ring of the bearing has a tight fit and the outer ring has a loose fit, place the copper rod close to the end face of the inner ring of the bearing, directly hit the copper rod with a hammer, and transfer the force through the copper rod to install the bearing on the shaft slowly.

When the inner ring of the bearing is large, you can use copper rods to strike hard evenly around the end surface of the inner ring of the bearing. Do not hit only one side, and do not use too much force. To be symmetrical, gently tap and slowly install it to avoid installing diagonal bearings. .

Tip 2. Use sleeve to install

This method is the same as using copper rods to install bearings. It is to press the sleeve directly on the end surface of the bearing (the end surface of the inner ring is pressed when the bearing is installed on the shaft; the end surface of the outer ring is pressed when installed in the housing hole), and the striking force of the hand hammer can be evenly distributed on the installation The end face of the whole ring of the bearing, and can be used in conjunction with the press, saving labor and time, reliable quality. The sleeve used for installation should be made of soft metal (either copper or low carbon steel pipe).

If the bearing is installed on the shaft, the inner diameter of the sleeve should be slightly larger than the journal 1-4mm, and the outer diameter should be slightly smaller than the diameter of the flange of the inner ring of the bearing, or the thickness of the sleeve should prevail, and the thickness should be made equal to the thickness of the inner ring of the bearing 2/3-4/5, and both ends of the sleeve should be flat and perpendicular to the barrel. If the bearing is installed in the seat hole, the sleeve outer diameter should be slightly smaller than the bearing outer diameter.

Tip 3: Pressing in the press

The installation pressure should be directly applied to the end face of the interference fit bearing ring, otherwise it will cause pressure damage on the bearing working surface, causing the bearing to be quickly damaged.

Tip 4. Heating installation

For the installation of bearings with large interference or large-size bearings, in order to facilitate the installation, the principle of thermal expansion and contraction can be used to heat the bearings in the oil tank and install them with copper rods, sleeves and hand hammers. The temperature during heating is generally controlled below 100°C, and 80-90°C is more suitable.

When the temperature is too high, it is easy to cause the bearing ring raceway and rolling body to anneal, affecting the hardness and wear resistance, resulting in reduced bearing life and premature scrap.