Q: Tapered roller bearing inner ring and shaft with clearance fit, how to control the preload?

A: When the tapered roller bearing is installed, the outer ring of the bearing and the hole of the bearing seat should not be used with interference fit. The inner ring and the journal should not be too tight. Generally, the bearing can be pushed into the journal and bearing with both hands. The seat is more suitable.

The most important thing to install a tapered bearing is to adjust the axial clearance. Generally, adjustments can be made by adjusting the nut on the journal, adjusting the gasket and the thread in the bearing housing hole, or using a preloading spring. The size of the axial clearance is related to the arrangement of the bearing when it is installed, the distance between the bearings, and the material of the shaft and the bearing housing, which can be determined according to the working conditions. For high-load and high-speed tapered roller bearings, when adjusting the clearance, the influence of temperature rise on the axial clearance must be considered, and the amount of clearance reduction caused by temperature rise should be estimated, that is, the axial clearance should be Adjust it appropriately.

For bearings with low speed and vibration resistance, no clearance installation is required to make the roller and the raceway of the tapered roller bearing have good contact and the load is evenly distributed. After adjustment, the axial clearance is measured with a dial gauge. The method is to fix the dial gauge on the fuselage or the bearing seat, so that the dial gauge contact bears against the smooth surface of the bearing, and pushes the shaft along the axial direction, and the maximum swing amount of the hands is the axial clearance. The adjustment of the axial clearance of the bearing with contact angle is the adjustment of the preload. When installing such bearings, care should be taken to ensure that the end faces of the tapered roller heads are in good contact with the large ribs of the inner ring.

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